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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/core/hub.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r--drivers/usb/core/hub.c6362
1 files changed, 6362 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
new file mode 100644
index 000000000..81c8f564c
--- /dev/null
+++ b/drivers/usb/core/hub.c
@@ -0,0 +1,6362 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB hub driver.
+ *
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999 Johannes Erdfelt
+ * (C) Copyright 1999 Gregory P. Smith
+ * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/completion.h>
+#include <linux/sched/mm.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/kcov.h>
+#include <linux/ioctl.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/onboard_hub.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/quirks.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/random.h>
+#include <linux/pm_qos.h>
+#include <linux/kobject.h>
+
+#include <linux/bitfield.h>
+#include <linux/uaccess.h>
+#include <asm/byteorder.h>
+
+#include "hub.h"
+#include "otg_productlist.h"
+
+#define USB_VENDOR_GENESYS_LOGIC 0x05e3
+#define USB_VENDOR_SMSC 0x0424
+#define USB_PRODUCT_USB5534B 0x5534
+#define USB_VENDOR_CYPRESS 0x04b4
+#define USB_PRODUCT_CY7C65632 0x6570
+#define USB_VENDOR_TEXAS_INSTRUMENTS 0x0451
+#define USB_PRODUCT_TUSB8041_USB3 0x8140
+#define USB_PRODUCT_TUSB8041_USB2 0x8142
+#define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
+#define HUB_QUIRK_DISABLE_AUTOSUSPEND 0x02
+
+#define USB_TP_TRANSMISSION_DELAY 40 /* ns */
+#define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */
+#define USB_PING_RESPONSE_TIME 400 /* ns */
+
+/* Protect struct usb_device->state and ->children members
+ * Note: Both are also protected by ->dev.sem, except that ->state can
+ * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
+static DEFINE_SPINLOCK(device_state_lock);
+
+/* workqueue to process hub events */
+static struct workqueue_struct *hub_wq;
+static void hub_event(struct work_struct *work);
+
+/* synchronize hub-port add/remove and peering operations */
+DEFINE_MUTEX(usb_port_peer_mutex);
+
+/* cycle leds on hubs that aren't blinking for attention */
+static bool blinkenlights;
+module_param(blinkenlights, bool, S_IRUGO);
+MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs");
+
+/*
+ * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
+ * 10 seconds to send reply for the initial 64-byte descriptor request.
+ */
+/* define initial 64-byte descriptor request timeout in milliseconds */
+static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
+module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(initial_descriptor_timeout,
+ "initial 64-byte descriptor request timeout in milliseconds "
+ "(default 5000 - 5.0 seconds)");
+
+/*
+ * As of 2.6.10 we introduce a new USB device initialization scheme which
+ * closely resembles the way Windows works. Hopefully it will be compatible
+ * with a wider range of devices than the old scheme. However some previously
+ * working devices may start giving rise to "device not accepting address"
+ * errors; if that happens the user can try the old scheme by adjusting the
+ * following module parameters.
+ *
+ * For maximum flexibility there are two boolean parameters to control the
+ * hub driver's behavior. On the first initialization attempt, if the
+ * "old_scheme_first" parameter is set then the old scheme will be used,
+ * otherwise the new scheme is used. If that fails and "use_both_schemes"
+ * is set, then the driver will make another attempt, using the other scheme.
+ */
+static bool old_scheme_first;
+module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(old_scheme_first,
+ "start with the old device initialization scheme");
+
+static bool use_both_schemes = true;
+module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(use_both_schemes,
+ "try the other device initialization scheme if the "
+ "first one fails");
+
+/* Mutual exclusion for EHCI CF initialization. This interferes with
+ * port reset on some companion controllers.
+ */
+DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
+EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
+
+#define HUB_DEBOUNCE_TIMEOUT 2000
+#define HUB_DEBOUNCE_STEP 25
+#define HUB_DEBOUNCE_STABLE 100
+
+static void hub_release(struct kref *kref);
+static int usb_reset_and_verify_device(struct usb_device *udev);
+static int hub_port_disable(struct usb_hub *hub, int port1, int set_state);
+static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
+ u16 portstatus);
+
+static inline char *portspeed(struct usb_hub *hub, int portstatus)
+{
+ if (hub_is_superspeedplus(hub->hdev))
+ return "10.0 Gb/s";
+ if (hub_is_superspeed(hub->hdev))
+ return "5.0 Gb/s";
+ if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+ return "480 Mb/s";
+ else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+ return "1.5 Mb/s";
+ else
+ return "12 Mb/s";
+}
+
+/* Note that hdev or one of its children must be locked! */
+struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev)
+{
+ if (!hdev || !hdev->actconfig || !hdev->maxchild)
+ return NULL;
+ return usb_get_intfdata(hdev->actconfig->interface[0]);
+}
+
+int usb_device_supports_lpm(struct usb_device *udev)
+{
+ /* Some devices have trouble with LPM */
+ if (udev->quirks & USB_QUIRK_NO_LPM)
+ return 0;
+
+ /* Skip if the device BOS descriptor couldn't be read */
+ if (!udev->bos)
+ return 0;
+
+ /* USB 2.1 (and greater) devices indicate LPM support through
+ * their USB 2.0 Extended Capabilities BOS descriptor.
+ */
+ if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) {
+ if (udev->bos->ext_cap &&
+ (USB_LPM_SUPPORT &
+ le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
+ return 1;
+ return 0;
+ }
+
+ /*
+ * According to the USB 3.0 spec, all USB 3.0 devices must support LPM.
+ * However, there are some that don't, and they set the U1/U2 exit
+ * latencies to zero.
+ */
+ if (!udev->bos->ss_cap) {
+ dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n");
+ return 0;
+ }
+
+ if (udev->bos->ss_cap->bU1devExitLat == 0 &&
+ udev->bos->ss_cap->bU2DevExitLat == 0) {
+ if (udev->parent)
+ dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n");
+ else
+ dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n");
+ return 0;
+ }
+
+ if (!udev->parent || udev->parent->lpm_capable)
+ return 1;
+ return 0;
+}
+
+/*
+ * Set the Maximum Exit Latency (MEL) for the host to wakup up the path from
+ * U1/U2, send a PING to the device and receive a PING_RESPONSE.
+ * See USB 3.1 section C.1.5.2
+ */
+static void usb_set_lpm_mel(struct usb_device *udev,
+ struct usb3_lpm_parameters *udev_lpm_params,
+ unsigned int udev_exit_latency,
+ struct usb_hub *hub,
+ struct usb3_lpm_parameters *hub_lpm_params,
+ unsigned int hub_exit_latency)
+{
+ unsigned int total_mel;
+
+ /*
+ * tMEL1. time to transition path from host to device into U0.
+ * MEL for parent already contains the delay up to parent, so only add
+ * the exit latency for the last link (pick the slower exit latency),
+ * and the hub header decode latency. See USB 3.1 section C 2.2.1
+ * Store MEL in nanoseconds
+ */
+ total_mel = hub_lpm_params->mel +
+ max(udev_exit_latency, hub_exit_latency) * 1000 +
+ hub->descriptor->u.ss.bHubHdrDecLat * 100;
+
+ /*
+ * tMEL2. Time to submit PING packet. Sum of tTPTransmissionDelay for
+ * each link + wHubDelay for each hub. Add only for last link.
+ * tMEL4, the time for PING_RESPONSE to traverse upstream is similar.
+ * Multiply by 2 to include it as well.
+ */
+ total_mel += (__le16_to_cpu(hub->descriptor->u.ss.wHubDelay) +
+ USB_TP_TRANSMISSION_DELAY) * 2;
+
+ /*
+ * tMEL3, tPingResponse. Time taken by device to generate PING_RESPONSE
+ * after receiving PING. Also add 2100ns as stated in USB 3.1 C 1.5.2.4
+ * to cover the delay if the PING_RESPONSE is queued behind a Max Packet
+ * Size DP.
+ * Note these delays should be added only once for the entire path, so
+ * add them to the MEL of the device connected to the roothub.
+ */
+ if (!hub->hdev->parent)
+ total_mel += USB_PING_RESPONSE_TIME + 2100;
+
+ udev_lpm_params->mel = total_mel;
+}
+
+/*
+ * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
+ * a transition from either U1 or U2.
+ */
+static void usb_set_lpm_pel(struct usb_device *udev,
+ struct usb3_lpm_parameters *udev_lpm_params,
+ unsigned int udev_exit_latency,
+ struct usb_hub *hub,
+ struct usb3_lpm_parameters *hub_lpm_params,
+ unsigned int hub_exit_latency,
+ unsigned int port_to_port_exit_latency)
+{
+ unsigned int first_link_pel;
+ unsigned int hub_pel;
+
+ /*
+ * First, the device sends an LFPS to transition the link between the
+ * device and the parent hub into U0. The exit latency is the bigger of
+ * the device exit latency or the hub exit latency.
+ */
+ if (udev_exit_latency > hub_exit_latency)
+ first_link_pel = udev_exit_latency * 1000;
+ else
+ first_link_pel = hub_exit_latency * 1000;
+
+ /*
+ * When the hub starts to receive the LFPS, there is a slight delay for
+ * it to figure out that one of the ports is sending an LFPS. Then it
+ * will forward the LFPS to its upstream link. The exit latency is the
+ * delay, plus the PEL that we calculated for this hub.
+ */
+ hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;
+
+ /*
+ * According to figure C-7 in the USB 3.0 spec, the PEL for this device
+ * is the greater of the two exit latencies.
+ */
+ if (first_link_pel > hub_pel)
+ udev_lpm_params->pel = first_link_pel;
+ else
+ udev_lpm_params->pel = hub_pel;
+}
+
+/*
+ * Set the System Exit Latency (SEL) to indicate the total worst-case time from
+ * when a device initiates a transition to U0, until when it will receive the
+ * first packet from the host controller.
+ *
+ * Section C.1.5.1 describes the four components to this:
+ * - t1: device PEL
+ * - t2: time for the ERDY to make it from the device to the host.
+ * - t3: a host-specific delay to process the ERDY.
+ * - t4: time for the packet to make it from the host to the device.
+ *
+ * t3 is specific to both the xHCI host and the platform the host is integrated
+ * into. The Intel HW folks have said it's negligible, FIXME if a different
+ * vendor says otherwise.
+ */
+static void usb_set_lpm_sel(struct usb_device *udev,
+ struct usb3_lpm_parameters *udev_lpm_params)
+{
+ struct usb_device *parent;
+ unsigned int num_hubs;
+ unsigned int total_sel;
+
+ /* t1 = device PEL */
+ total_sel = udev_lpm_params->pel;
+ /* How many external hubs are in between the device & the root port. */
+ for (parent = udev->parent, num_hubs = 0; parent->parent;
+ parent = parent->parent)
+ num_hubs++;
+ /* t2 = 2.1us + 250ns * (num_hubs - 1) */
+ if (num_hubs > 0)
+ total_sel += 2100 + 250 * (num_hubs - 1);
+
+ /* t4 = 250ns * num_hubs */
+ total_sel += 250 * num_hubs;
+
+ udev_lpm_params->sel = total_sel;
+}
+
+static void usb_set_lpm_parameters(struct usb_device *udev)
+{
+ struct usb_hub *hub;
+ unsigned int port_to_port_delay;
+ unsigned int udev_u1_del;
+ unsigned int udev_u2_del;
+ unsigned int hub_u1_del;
+ unsigned int hub_u2_del;
+
+ if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER)
+ return;
+
+ /* Skip if the device BOS descriptor couldn't be read */
+ if (!udev->bos)
+ return;
+
+ hub = usb_hub_to_struct_hub(udev->parent);
+ /* It doesn't take time to transition the roothub into U0, since it
+ * doesn't have an upstream link.
+ */
+ if (!hub)
+ return;
+
+ udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
+ udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat);
+ hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
+ hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat);
+
+ usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
+ hub, &udev->parent->u1_params, hub_u1_del);
+
+ usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
+ hub, &udev->parent->u2_params, hub_u2_del);
+
+ /*
+ * Appendix C, section C.2.2.2, says that there is a slight delay from
+ * when the parent hub notices the downstream port is trying to
+ * transition to U0 to when the hub initiates a U0 transition on its
+ * upstream port. The section says the delays are tPort2PortU1EL and
+ * tPort2PortU2EL, but it doesn't define what they are.
+ *
+ * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
+ * about the same delays. Use the maximum delay calculations from those
+ * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
+ * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
+ * assume the device exit latencies they are talking about are the hub
+ * exit latencies.
+ *
+ * What do we do if the U2 exit latency is less than the U1 exit
+ * latency? It's possible, although not likely...
+ */
+ port_to_port_delay = 1;
+
+ usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
+ hub, &udev->parent->u1_params, hub_u1_del,
+ port_to_port_delay);
+
+ if (hub_u2_del > hub_u1_del)
+ port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
+ else
+ port_to_port_delay = 1 + hub_u1_del;
+
+ usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
+ hub, &udev->parent->u2_params, hub_u2_del,
+ port_to_port_delay);
+
+ /* Now that we've got PEL, calculate SEL. */
+ usb_set_lpm_sel(udev, &udev->u1_params);
+ usb_set_lpm_sel(udev, &udev->u2_params);
+}
+
+/* USB 2.0 spec Section 11.24.4.5 */
+static int get_hub_descriptor(struct usb_device *hdev,
+ struct usb_hub_descriptor *desc)
+{
+ int i, ret, size;
+ unsigned dtype;
+
+ if (hub_is_superspeed(hdev)) {
+ dtype = USB_DT_SS_HUB;
+ size = USB_DT_SS_HUB_SIZE;
+ } else {
+ dtype = USB_DT_HUB;
+ size = sizeof(struct usb_hub_descriptor);
+ }
+
+ for (i = 0; i < 3; i++) {
+ ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
+ dtype << 8, 0, desc, size,
+ USB_CTRL_GET_TIMEOUT);
+ if (hub_is_superspeed(hdev)) {
+ if (ret == size)
+ return ret;
+ } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) {
+ /* Make sure we have the DeviceRemovable field. */
+ size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1;
+ if (ret < size)
+ return -EMSGSIZE;
+ return ret;
+ }
+ }
+ return -EINVAL;
+}
+
+/*
+ * USB 2.0 spec Section 11.24.2.1
+ */
+static int clear_hub_feature(struct usb_device *hdev, int feature)
+{
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
+}
+
+/*
+ * USB 2.0 spec Section 11.24.2.2
+ */
+int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature)
+{
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
+ NULL, 0, 1000);
+}
+
+/*
+ * USB 2.0 spec Section 11.24.2.13
+ */
+static int set_port_feature(struct usb_device *hdev, int port1, int feature)
+{
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
+ NULL, 0, 1000);
+}
+
+static char *to_led_name(int selector)
+{
+ switch (selector) {
+ case HUB_LED_AMBER:
+ return "amber";
+ case HUB_LED_GREEN:
+ return "green";
+ case HUB_LED_OFF:
+ return "off";
+ case HUB_LED_AUTO:
+ return "auto";
+ default:
+ return "??";
+ }
+}
+
+/*
+ * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
+ * for info about using port indicators
+ */
+static void set_port_led(struct usb_hub *hub, int port1, int selector)
+{
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ int status;
+
+ status = set_port_feature(hub->hdev, (selector << 8) | port1,
+ USB_PORT_FEAT_INDICATOR);
+ dev_dbg(&port_dev->dev, "indicator %s status %d\n",
+ to_led_name(selector), status);
+}
+
+#define LED_CYCLE_PERIOD ((2*HZ)/3)
+
+static void led_work(struct work_struct *work)
+{
+ struct usb_hub *hub =
+ container_of(work, struct usb_hub, leds.work);
+ struct usb_device *hdev = hub->hdev;
+ unsigned i;
+ unsigned changed = 0;
+ int cursor = -1;
+
+ if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
+ return;
+
+ for (i = 0; i < hdev->maxchild; i++) {
+ unsigned selector, mode;
+
+ /* 30%-50% duty cycle */
+
+ switch (hub->indicator[i]) {
+ /* cycle marker */
+ case INDICATOR_CYCLE:
+ cursor = i;
+ selector = HUB_LED_AUTO;
+ mode = INDICATOR_AUTO;
+ break;
+ /* blinking green = sw attention */
+ case INDICATOR_GREEN_BLINK:
+ selector = HUB_LED_GREEN;
+ mode = INDICATOR_GREEN_BLINK_OFF;
+ break;
+ case INDICATOR_GREEN_BLINK_OFF:
+ selector = HUB_LED_OFF;
+ mode = INDICATOR_GREEN_BLINK;
+ break;
+ /* blinking amber = hw attention */
+ case INDICATOR_AMBER_BLINK:
+ selector = HUB_LED_AMBER;
+ mode = INDICATOR_AMBER_BLINK_OFF;
+ break;
+ case INDICATOR_AMBER_BLINK_OFF:
+ selector = HUB_LED_OFF;
+ mode = INDICATOR_AMBER_BLINK;
+ break;
+ /* blink green/amber = reserved */
+ case INDICATOR_ALT_BLINK:
+ selector = HUB_LED_GREEN;
+ mode = INDICATOR_ALT_BLINK_OFF;
+ break;
+ case INDICATOR_ALT_BLINK_OFF:
+ selector = HUB_LED_AMBER;
+ mode = INDICATOR_ALT_BLINK;
+ break;
+ default:
+ continue;
+ }
+ if (selector != HUB_LED_AUTO)
+ changed = 1;
+ set_port_led(hub, i + 1, selector);
+ hub->indicator[i] = mode;
+ }
+ if (!changed && blinkenlights) {
+ cursor++;
+ cursor %= hdev->maxchild;
+ set_port_led(hub, cursor + 1, HUB_LED_GREEN);
+ hub->indicator[cursor] = INDICATOR_CYCLE;
+ changed++;
+ }
+ if (changed)
+ queue_delayed_work(system_power_efficient_wq,
+ &hub->leds, LED_CYCLE_PERIOD);
+}
+
+/* use a short timeout for hub/port status fetches */
+#define USB_STS_TIMEOUT 1000
+#define USB_STS_RETRIES 5
+
+/*
+ * USB 2.0 spec Section 11.24.2.6
+ */
+static int get_hub_status(struct usb_device *hdev,
+ struct usb_hub_status *data)
+{
+ int i, status = -ETIMEDOUT;
+
+ for (i = 0; i < USB_STS_RETRIES &&
+ (status == -ETIMEDOUT || status == -EPIPE); i++) {
+ status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
+ data, sizeof(*data), USB_STS_TIMEOUT);
+ }
+ return status;
+}
+
+/*
+ * USB 2.0 spec Section 11.24.2.7
+ * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6
+ */
+static int get_port_status(struct usb_device *hdev, int port1,
+ void *data, u16 value, u16 length)
+{
+ int i, status = -ETIMEDOUT;
+
+ for (i = 0; i < USB_STS_RETRIES &&
+ (status == -ETIMEDOUT || status == -EPIPE); i++) {
+ status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value,
+ port1, data, length, USB_STS_TIMEOUT);
+ }
+ return status;
+}
+
+static int hub_ext_port_status(struct usb_hub *hub, int port1, int type,
+ u16 *status, u16 *change, u32 *ext_status)
+{
+ int ret;
+ int len = 4;
+
+ if (type != HUB_PORT_STATUS)
+ len = 8;
+
+ mutex_lock(&hub->status_mutex);
+ ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len);
+ if (ret < len) {
+ if (ret != -ENODEV)
+ dev_err(hub->intfdev,
+ "%s failed (err = %d)\n", __func__, ret);
+ if (ret >= 0)
+ ret = -EIO;
+ } else {
+ *status = le16_to_cpu(hub->status->port.wPortStatus);
+ *change = le16_to_cpu(hub->status->port.wPortChange);
+ if (type != HUB_PORT_STATUS && ext_status)
+ *ext_status = le32_to_cpu(
+ hub->status->port.dwExtPortStatus);
+ ret = 0;
+ }
+ mutex_unlock(&hub->status_mutex);
+ return ret;
+}
+
+int usb_hub_port_status(struct usb_hub *hub, int port1,
+ u16 *status, u16 *change)
+{
+ return hub_ext_port_status(hub, port1, HUB_PORT_STATUS,
+ status, change, NULL);
+}
+
+static void hub_resubmit_irq_urb(struct usb_hub *hub)
+{
+ unsigned long flags;
+ int status;
+
+ spin_lock_irqsave(&hub->irq_urb_lock, flags);
+
+ if (hub->quiescing) {
+ spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
+ return;
+ }
+
+ status = usb_submit_urb(hub->urb, GFP_ATOMIC);
+ if (status && status != -ENODEV && status != -EPERM &&
+ status != -ESHUTDOWN) {
+ dev_err(hub->intfdev, "resubmit --> %d\n", status);
+ mod_timer(&hub->irq_urb_retry, jiffies + HZ);
+ }
+
+ spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
+}
+
+static void hub_retry_irq_urb(struct timer_list *t)
+{
+ struct usb_hub *hub = from_timer(hub, t, irq_urb_retry);
+
+ hub_resubmit_irq_urb(hub);
+}
+
+
+static void kick_hub_wq(struct usb_hub *hub)
+{
+ struct usb_interface *intf;
+
+ if (hub->disconnected || work_pending(&hub->events))
+ return;
+
+ /*
+ * Suppress autosuspend until the event is proceed.
+ *
+ * Be careful and make sure that the symmetric operation is
+ * always called. We are here only when there is no pending
+ * work for this hub. Therefore put the interface either when
+ * the new work is called or when it is canceled.
+ */
+ intf = to_usb_interface(hub->intfdev);
+ usb_autopm_get_interface_no_resume(intf);
+ kref_get(&hub->kref);
+
+ if (queue_work(hub_wq, &hub->events))
+ return;
+
+ /* the work has already been scheduled */
+ usb_autopm_put_interface_async(intf);
+ kref_put(&hub->kref, hub_release);
+}
+
+void usb_kick_hub_wq(struct usb_device *hdev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+
+ if (hub)
+ kick_hub_wq(hub);
+}
+
+/*
+ * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
+ * Notification, which indicates it had initiated remote wakeup.
+ *
+ * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
+ * device initiates resume, so the USB core will not receive notice of the
+ * resume through the normal hub interrupt URB.
+ */
+void usb_wakeup_notification(struct usb_device *hdev,
+ unsigned int portnum)
+{
+ struct usb_hub *hub;
+ struct usb_port *port_dev;
+
+ if (!hdev)
+ return;
+
+ hub = usb_hub_to_struct_hub(hdev);
+ if (hub) {
+ port_dev = hub->ports[portnum - 1];
+ if (port_dev && port_dev->child)
+ pm_wakeup_event(&port_dev->child->dev, 0);
+
+ set_bit(portnum, hub->wakeup_bits);
+ kick_hub_wq(hub);
+ }
+}
+EXPORT_SYMBOL_GPL(usb_wakeup_notification);
+
+/* completion function, fires on port status changes and various faults */
+static void hub_irq(struct urb *urb)
+{
+ struct usb_hub *hub = urb->context;
+ int status = urb->status;
+ unsigned i;
+ unsigned long bits;
+
+ switch (status) {
+ case -ENOENT: /* synchronous unlink */
+ case -ECONNRESET: /* async unlink */
+ case -ESHUTDOWN: /* hardware going away */
+ return;
+
+ default: /* presumably an error */
+ /* Cause a hub reset after 10 consecutive errors */
+ dev_dbg(hub->intfdev, "transfer --> %d\n", status);
+ if ((++hub->nerrors < 10) || hub->error)
+ goto resubmit;
+ hub->error = status;
+ fallthrough;
+
+ /* let hub_wq handle things */
+ case 0: /* we got data: port status changed */
+ bits = 0;
+ for (i = 0; i < urb->actual_length; ++i)
+ bits |= ((unsigned long) ((*hub->buffer)[i]))
+ << (i*8);
+ hub->event_bits[0] = bits;
+ break;
+ }
+
+ hub->nerrors = 0;
+
+ /* Something happened, let hub_wq figure it out */
+ kick_hub_wq(hub);
+
+resubmit:
+ hub_resubmit_irq_urb(hub);
+}
+
+/* USB 2.0 spec Section 11.24.2.3 */
+static inline int
+hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt)
+{
+ /* Need to clear both directions for control ep */
+ if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
+ USB_ENDPOINT_XFER_CONTROL) {
+ int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
+ devinfo ^ 0x8000, tt, NULL, 0, 1000);
+ if (status)
+ return status;
+ }
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
+ tt, NULL, 0, 1000);
+}
+
+/*
+ * enumeration blocks hub_wq for a long time. we use keventd instead, since
+ * long blocking there is the exception, not the rule. accordingly, HCDs
+ * talking to TTs must queue control transfers (not just bulk and iso), so
+ * both can talk to the same hub concurrently.
+ */
+static void hub_tt_work(struct work_struct *work)
+{
+ struct usb_hub *hub =
+ container_of(work, struct usb_hub, tt.clear_work);
+ unsigned long flags;
+
+ spin_lock_irqsave(&hub->tt.lock, flags);
+ while (!list_empty(&hub->tt.clear_list)) {
+ struct list_head *next;
+ struct usb_tt_clear *clear;
+ struct usb_device *hdev = hub->hdev;
+ const struct hc_driver *drv;
+ int status;
+
+ next = hub->tt.clear_list.next;
+ clear = list_entry(next, struct usb_tt_clear, clear_list);
+ list_del(&clear->clear_list);
+
+ /* drop lock so HCD can concurrently report other TT errors */
+ spin_unlock_irqrestore(&hub->tt.lock, flags);
+ status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt);
+ if (status && status != -ENODEV)
+ dev_err(&hdev->dev,
+ "clear tt %d (%04x) error %d\n",
+ clear->tt, clear->devinfo, status);
+
+ /* Tell the HCD, even if the operation failed */
+ drv = clear->hcd->driver;
+ if (drv->clear_tt_buffer_complete)
+ (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
+
+ kfree(clear);
+ spin_lock_irqsave(&hub->tt.lock, flags);
+ }
+ spin_unlock_irqrestore(&hub->tt.lock, flags);
+}
+
+/**
+ * usb_hub_set_port_power - control hub port's power state
+ * @hdev: USB device belonging to the usb hub
+ * @hub: target hub
+ * @port1: port index
+ * @set: expected status
+ *
+ * call this function to control port's power via setting or
+ * clearing the port's PORT_POWER feature.
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
+ int port1, bool set)
+{
+ int ret;
+
+ if (set)
+ ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
+ else
+ ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
+
+ if (ret)
+ return ret;
+
+ if (set)
+ set_bit(port1, hub->power_bits);
+ else
+ clear_bit(port1, hub->power_bits);
+ return 0;
+}
+
+/**
+ * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
+ * @urb: an URB associated with the failed or incomplete split transaction
+ *
+ * High speed HCDs use this to tell the hub driver that some split control or
+ * bulk transaction failed in a way that requires clearing internal state of
+ * a transaction translator. This is normally detected (and reported) from
+ * interrupt context.
+ *
+ * It may not be possible for that hub to handle additional full (or low)
+ * speed transactions until that state is fully cleared out.
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+int usb_hub_clear_tt_buffer(struct urb *urb)
+{
+ struct usb_device *udev = urb->dev;
+ int pipe = urb->pipe;
+ struct usb_tt *tt = udev->tt;
+ unsigned long flags;
+ struct usb_tt_clear *clear;
+
+ /* we've got to cope with an arbitrary number of pending TT clears,
+ * since each TT has "at least two" buffers that can need it (and
+ * there can be many TTs per hub). even if they're uncommon.
+ */
+ clear = kmalloc(sizeof *clear, GFP_ATOMIC);
+ if (clear == NULL) {
+ dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
+ /* FIXME recover somehow ... RESET_TT? */
+ return -ENOMEM;
+ }
+
+ /* info that CLEAR_TT_BUFFER needs */
+ clear->tt = tt->multi ? udev->ttport : 1;
+ clear->devinfo = usb_pipeendpoint (pipe);
+ clear->devinfo |= ((u16)udev->devaddr) << 4;
+ clear->devinfo |= usb_pipecontrol(pipe)
+ ? (USB_ENDPOINT_XFER_CONTROL << 11)
+ : (USB_ENDPOINT_XFER_BULK << 11);
+ if (usb_pipein(pipe))
+ clear->devinfo |= 1 << 15;
+
+ /* info for completion callback */
+ clear->hcd = bus_to_hcd(udev->bus);
+ clear->ep = urb->ep;
+
+ /* tell keventd to clear state for this TT */
+ spin_lock_irqsave(&tt->lock, flags);
+ list_add_tail(&clear->clear_list, &tt->clear_list);
+ schedule_work(&tt->clear_work);
+ spin_unlock_irqrestore(&tt->lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
+
+static void hub_power_on(struct usb_hub *hub, bool do_delay)
+{
+ int port1;
+
+ /* Enable power on each port. Some hubs have reserved values
+ * of LPSM (> 2) in their descriptors, even though they are
+ * USB 2.0 hubs. Some hubs do not implement port-power switching
+ * but only emulate it. In all cases, the ports won't work
+ * unless we send these messages to the hub.
+ */
+ if (hub_is_port_power_switchable(hub))
+ dev_dbg(hub->intfdev, "enabling power on all ports\n");
+ else
+ dev_dbg(hub->intfdev, "trying to enable port power on "
+ "non-switchable hub\n");
+ for (port1 = 1; port1 <= hub->hdev->maxchild; port1++)
+ if (test_bit(port1, hub->power_bits))
+ set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
+ else
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_POWER);
+ if (do_delay)
+ msleep(hub_power_on_good_delay(hub));
+}
+
+static int hub_hub_status(struct usb_hub *hub,
+ u16 *status, u16 *change)
+{
+ int ret;
+
+ mutex_lock(&hub->status_mutex);
+ ret = get_hub_status(hub->hdev, &hub->status->hub);
+ if (ret < 0) {
+ if (ret != -ENODEV)
+ dev_err(hub->intfdev,
+ "%s failed (err = %d)\n", __func__, ret);
+ } else {
+ *status = le16_to_cpu(hub->status->hub.wHubStatus);
+ *change = le16_to_cpu(hub->status->hub.wHubChange);
+ ret = 0;
+ }
+ mutex_unlock(&hub->status_mutex);
+ return ret;
+}
+
+static int hub_set_port_link_state(struct usb_hub *hub, int port1,
+ unsigned int link_status)
+{
+ return set_port_feature(hub->hdev,
+ port1 | (link_status << 3),
+ USB_PORT_FEAT_LINK_STATE);
+}
+
+/*
+ * Disable a port and mark a logical connect-change event, so that some
+ * time later hub_wq will disconnect() any existing usb_device on the port
+ * and will re-enumerate if there actually is a device attached.
+ */
+static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
+{
+ dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n");
+ hub_port_disable(hub, port1, 1);
+
+ /* FIXME let caller ask to power down the port:
+ * - some devices won't enumerate without a VBUS power cycle
+ * - SRP saves power that way
+ * - ... new call, TBD ...
+ * That's easy if this hub can switch power per-port, and
+ * hub_wq reactivates the port later (timer, SRP, etc).
+ * Powerdown must be optional, because of reset/DFU.
+ */
+
+ set_bit(port1, hub->change_bits);
+ kick_hub_wq(hub);
+}
+
+/**
+ * usb_remove_device - disable a device's port on its parent hub
+ * @udev: device to be disabled and removed
+ * Context: @udev locked, must be able to sleep.
+ *
+ * After @udev's port has been disabled, hub_wq is notified and it will
+ * see that the device has been disconnected. When the device is
+ * physically unplugged and something is plugged in, the events will
+ * be received and processed normally.
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+int usb_remove_device(struct usb_device *udev)
+{
+ struct usb_hub *hub;
+ struct usb_interface *intf;
+ int ret;
+
+ if (!udev->parent) /* Can't remove a root hub */
+ return -EINVAL;
+ hub = usb_hub_to_struct_hub(udev->parent);
+ intf = to_usb_interface(hub->intfdev);
+
+ ret = usb_autopm_get_interface(intf);
+ if (ret < 0)
+ return ret;
+
+ set_bit(udev->portnum, hub->removed_bits);
+ hub_port_logical_disconnect(hub, udev->portnum);
+ usb_autopm_put_interface(intf);
+ return 0;
+}
+
+enum hub_activation_type {
+ HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
+ HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
+};
+
+static void hub_init_func2(struct work_struct *ws);
+static void hub_init_func3(struct work_struct *ws);
+
+static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
+{
+ struct usb_device *hdev = hub->hdev;
+ struct usb_hcd *hcd;
+ int ret;
+ int port1;
+ int status;
+ bool need_debounce_delay = false;
+ unsigned delay;
+
+ /* Continue a partial initialization */
+ if (type == HUB_INIT2 || type == HUB_INIT3) {
+ device_lock(&hdev->dev);
+
+ /* Was the hub disconnected while we were waiting? */
+ if (hub->disconnected)
+ goto disconnected;
+ if (type == HUB_INIT2)
+ goto init2;
+ goto init3;
+ }
+ kref_get(&hub->kref);
+
+ /* The superspeed hub except for root hub has to use Hub Depth
+ * value as an offset into the route string to locate the bits
+ * it uses to determine the downstream port number. So hub driver
+ * should send a set hub depth request to superspeed hub after
+ * the superspeed hub is set configuration in initialization or
+ * reset procedure.
+ *
+ * After a resume, port power should still be on.
+ * For any other type of activation, turn it on.
+ */
+ if (type != HUB_RESUME) {
+ if (hdev->parent && hub_is_superspeed(hdev)) {
+ ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ HUB_SET_DEPTH, USB_RT_HUB,
+ hdev->level - 1, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (ret < 0)
+ dev_err(hub->intfdev,
+ "set hub depth failed\n");
+ }
+
+ /* Speed up system boot by using a delayed_work for the
+ * hub's initial power-up delays. This is pretty awkward
+ * and the implementation looks like a home-brewed sort of
+ * setjmp/longjmp, but it saves at least 100 ms for each
+ * root hub (assuming usbcore is compiled into the kernel
+ * rather than as a module). It adds up.
+ *
+ * This can't be done for HUB_RESUME or HUB_RESET_RESUME
+ * because for those activation types the ports have to be
+ * operational when we return. In theory this could be done
+ * for HUB_POST_RESET, but it's easier not to.
+ */
+ if (type == HUB_INIT) {
+ delay = hub_power_on_good_delay(hub);
+
+ hub_power_on(hub, false);
+ INIT_DELAYED_WORK(&hub->init_work, hub_init_func2);
+ queue_delayed_work(system_power_efficient_wq,
+ &hub->init_work,
+ msecs_to_jiffies(delay));
+
+ /* Suppress autosuspend until init is done */
+ usb_autopm_get_interface_no_resume(
+ to_usb_interface(hub->intfdev));
+ return; /* Continues at init2: below */
+ } else if (type == HUB_RESET_RESUME) {
+ /* The internal host controller state for the hub device
+ * may be gone after a host power loss on system resume.
+ * Update the device's info so the HW knows it's a hub.
+ */
+ hcd = bus_to_hcd(hdev->bus);
+ if (hcd->driver->update_hub_device) {
+ ret = hcd->driver->update_hub_device(hcd, hdev,
+ &hub->tt, GFP_NOIO);
+ if (ret < 0) {
+ dev_err(hub->intfdev,
+ "Host not accepting hub info update\n");
+ dev_err(hub->intfdev,
+ "LS/FS devices and hubs may not work under this hub\n");
+ }
+ }
+ hub_power_on(hub, true);
+ } else {
+ hub_power_on(hub, true);
+ }
+ /* Give some time on remote wakeup to let links to transit to U0 */
+ } else if (hub_is_superspeed(hub->hdev))
+ msleep(20);
+
+ init2:
+
+ /*
+ * Check each port and set hub->change_bits to let hub_wq know
+ * which ports need attention.
+ */
+ for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+ u16 portstatus, portchange;
+
+ portstatus = portchange = 0;
+ status = usb_hub_port_status(hub, port1, &portstatus, &portchange);
+ if (status)
+ goto abort;
+
+ if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
+ dev_dbg(&port_dev->dev, "status %04x change %04x\n",
+ portstatus, portchange);
+
+ /*
+ * After anything other than HUB_RESUME (i.e., initialization
+ * or any sort of reset), every port should be disabled.
+ * Unconnected ports should likewise be disabled (paranoia),
+ * and so should ports for which we have no usb_device.
+ */
+ if ((portstatus & USB_PORT_STAT_ENABLE) && (
+ type != HUB_RESUME ||
+ !(portstatus & USB_PORT_STAT_CONNECTION) ||
+ !udev ||
+ udev->state == USB_STATE_NOTATTACHED)) {
+ /*
+ * USB3 protocol ports will automatically transition
+ * to Enabled state when detect an USB3.0 device attach.
+ * Do not disable USB3 protocol ports, just pretend
+ * power was lost
+ */
+ portstatus &= ~USB_PORT_STAT_ENABLE;
+ if (!hub_is_superspeed(hdev))
+ usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_ENABLE);
+ }
+
+ /* Make sure a warm-reset request is handled by port_event */
+ if (type == HUB_RESUME &&
+ hub_port_warm_reset_required(hub, port1, portstatus))
+ set_bit(port1, hub->event_bits);
+
+ /*
+ * Add debounce if USB3 link is in polling/link training state.
+ * Link will automatically transition to Enabled state after
+ * link training completes.
+ */
+ if (hub_is_superspeed(hdev) &&
+ ((portstatus & USB_PORT_STAT_LINK_STATE) ==
+ USB_SS_PORT_LS_POLLING))
+ need_debounce_delay = true;
+
+ /* Clear status-change flags; we'll debounce later */
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ need_debounce_delay = true;
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+ }
+ if (portchange & USB_PORT_STAT_C_ENABLE) {
+ need_debounce_delay = true;
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_ENABLE);
+ }
+ if (portchange & USB_PORT_STAT_C_RESET) {
+ need_debounce_delay = true;
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_RESET);
+ }
+ if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
+ hub_is_superspeed(hub->hdev)) {
+ need_debounce_delay = true;
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_BH_PORT_RESET);
+ }
+ /* We can forget about a "removed" device when there's a
+ * physical disconnect or the connect status changes.
+ */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+ (portchange & USB_PORT_STAT_C_CONNECTION))
+ clear_bit(port1, hub->removed_bits);
+
+ if (!udev || udev->state == USB_STATE_NOTATTACHED) {
+ /* Tell hub_wq to disconnect the device or
+ * check for a new connection or over current condition.
+ * Based on USB2.0 Spec Section 11.12.5,
+ * C_PORT_OVER_CURRENT could be set while
+ * PORT_OVER_CURRENT is not. So check for any of them.
+ */
+ if (udev || (portstatus & USB_PORT_STAT_CONNECTION) ||
+ (portchange & USB_PORT_STAT_C_CONNECTION) ||
+ (portstatus & USB_PORT_STAT_OVERCURRENT) ||
+ (portchange & USB_PORT_STAT_C_OVERCURRENT))
+ set_bit(port1, hub->change_bits);
+
+ } else if (portstatus & USB_PORT_STAT_ENABLE) {
+ bool port_resumed = (portstatus &
+ USB_PORT_STAT_LINK_STATE) ==
+ USB_SS_PORT_LS_U0;
+ /* The power session apparently survived the resume.
+ * If there was an overcurrent or suspend change
+ * (i.e., remote wakeup request), have hub_wq
+ * take care of it. Look at the port link state
+ * for USB 3.0 hubs, since they don't have a suspend
+ * change bit, and they don't set the port link change
+ * bit on device-initiated resume.
+ */
+ if (portchange || (hub_is_superspeed(hub->hdev) &&
+ port_resumed))
+ set_bit(port1, hub->event_bits);
+
+ } else if (udev->persist_enabled) {
+#ifdef CONFIG_PM
+ udev->reset_resume = 1;
+#endif
+ /* Don't set the change_bits when the device
+ * was powered off.
+ */
+ if (test_bit(port1, hub->power_bits))
+ set_bit(port1, hub->change_bits);
+
+ } else {
+ /* The power session is gone; tell hub_wq */
+ usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+ set_bit(port1, hub->change_bits);
+ }
+ }
+
+ /* If no port-status-change flags were set, we don't need any
+ * debouncing. If flags were set we can try to debounce the
+ * ports all at once right now, instead of letting hub_wq do them
+ * one at a time later on.
+ *
+ * If any port-status changes do occur during this delay, hub_wq
+ * will see them later and handle them normally.
+ */
+ if (need_debounce_delay) {
+ delay = HUB_DEBOUNCE_STABLE;
+
+ /* Don't do a long sleep inside a workqueue routine */
+ if (type == HUB_INIT2) {
+ INIT_DELAYED_WORK(&hub->init_work, hub_init_func3);
+ queue_delayed_work(system_power_efficient_wq,
+ &hub->init_work,
+ msecs_to_jiffies(delay));
+ device_unlock(&hdev->dev);
+ return; /* Continues at init3: below */
+ } else {
+ msleep(delay);
+ }
+ }
+ init3:
+ hub->quiescing = 0;
+
+ status = usb_submit_urb(hub->urb, GFP_NOIO);
+ if (status < 0)
+ dev_err(hub->intfdev, "activate --> %d\n", status);
+ if (hub->has_indicators && blinkenlights)
+ queue_delayed_work(system_power_efficient_wq,
+ &hub->leds, LED_CYCLE_PERIOD);
+
+ /* Scan all ports that need attention */
+ kick_hub_wq(hub);
+ abort:
+ if (type == HUB_INIT2 || type == HUB_INIT3) {
+ /* Allow autosuspend if it was suppressed */
+ disconnected:
+ usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
+ device_unlock(&hdev->dev);
+ }
+
+ kref_put(&hub->kref, hub_release);
+}
+
+/* Implement the continuations for the delays above */
+static void hub_init_func2(struct work_struct *ws)
+{
+ struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+ hub_activate(hub, HUB_INIT2);
+}
+
+static void hub_init_func3(struct work_struct *ws)
+{
+ struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
+
+ hub_activate(hub, HUB_INIT3);
+}
+
+enum hub_quiescing_type {
+ HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
+};
+
+static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
+{
+ struct usb_device *hdev = hub->hdev;
+ unsigned long flags;
+ int i;
+
+ /* hub_wq and related activity won't re-trigger */
+ spin_lock_irqsave(&hub->irq_urb_lock, flags);
+ hub->quiescing = 1;
+ spin_unlock_irqrestore(&hub->irq_urb_lock, flags);
+
+ if (type != HUB_SUSPEND) {
+ /* Disconnect all the children */
+ for (i = 0; i < hdev->maxchild; ++i) {
+ if (hub->ports[i]->child)
+ usb_disconnect(&hub->ports[i]->child);
+ }
+ }
+
+ /* Stop hub_wq and related activity */
+ del_timer_sync(&hub->irq_urb_retry);
+ usb_kill_urb(hub->urb);
+ if (hub->has_indicators)
+ cancel_delayed_work_sync(&hub->leds);
+ if (hub->tt.hub)
+ flush_work(&hub->tt.clear_work);
+}
+
+static void hub_pm_barrier_for_all_ports(struct usb_hub *hub)
+{
+ int i;
+
+ for (i = 0; i < hub->hdev->maxchild; ++i)
+ pm_runtime_barrier(&hub->ports[i]->dev);
+}
+
+/* caller has locked the hub device */
+static int hub_pre_reset(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+
+ hub_quiesce(hub, HUB_PRE_RESET);
+ hub->in_reset = 1;
+ hub_pm_barrier_for_all_ports(hub);
+ return 0;
+}
+
+/* caller has locked the hub device */
+static int hub_post_reset(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+
+ hub->in_reset = 0;
+ hub_pm_barrier_for_all_ports(hub);
+ hub_activate(hub, HUB_POST_RESET);
+ return 0;
+}
+
+static int hub_configure(struct usb_hub *hub,
+ struct usb_endpoint_descriptor *endpoint)
+{
+ struct usb_hcd *hcd;
+ struct usb_device *hdev = hub->hdev;
+ struct device *hub_dev = hub->intfdev;
+ u16 hubstatus, hubchange;
+ u16 wHubCharacteristics;
+ unsigned int pipe;
+ int maxp, ret, i;
+ char *message = "out of memory";
+ unsigned unit_load;
+ unsigned full_load;
+ unsigned maxchild;
+
+ hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
+ if (!hub->buffer) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
+ if (!hub->status) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ mutex_init(&hub->status_mutex);
+
+ hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL);
+ if (!hub->descriptor) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ /* Request the entire hub descriptor.
+ * hub->descriptor can handle USB_MAXCHILDREN ports,
+ * but a (non-SS) hub can/will return fewer bytes here.
+ */
+ ret = get_hub_descriptor(hdev, hub->descriptor);
+ if (ret < 0) {
+ message = "can't read hub descriptor";
+ goto fail;
+ }
+
+ maxchild = USB_MAXCHILDREN;
+ if (hub_is_superspeed(hdev))
+ maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS);
+
+ if (hub->descriptor->bNbrPorts > maxchild) {
+ message = "hub has too many ports!";
+ ret = -ENODEV;
+ goto fail;
+ } else if (hub->descriptor->bNbrPorts == 0) {
+ message = "hub doesn't have any ports!";
+ ret = -ENODEV;
+ goto fail;
+ }
+
+ /*
+ * Accumulate wHubDelay + 40ns for every hub in the tree of devices.
+ * The resulting value will be used for SetIsochDelay() request.
+ */
+ if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) {
+ u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay);
+
+ if (hdev->parent)
+ delay += hdev->parent->hub_delay;
+
+ delay += USB_TP_TRANSMISSION_DELAY;
+ hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX);
+ }
+
+ maxchild = hub->descriptor->bNbrPorts;
+ dev_info(hub_dev, "%d port%s detected\n", maxchild,
+ (maxchild == 1) ? "" : "s");
+
+ hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL);
+ if (!hub->ports) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
+ if (hub_is_superspeed(hdev)) {
+ unit_load = 150;
+ full_load = 900;
+ } else {
+ unit_load = 100;
+ full_load = 500;
+ }
+
+ /* FIXME for USB 3.0, skip for now */
+ if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
+ !(hub_is_superspeed(hdev))) {
+ char portstr[USB_MAXCHILDREN + 1];
+
+ for (i = 0; i < maxchild; i++)
+ portstr[i] = hub->descriptor->u.hs.DeviceRemovable
+ [((i + 1) / 8)] & (1 << ((i + 1) % 8))
+ ? 'F' : 'R';
+ portstr[maxchild] = 0;
+ dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
+ } else
+ dev_dbg(hub_dev, "standalone hub\n");
+
+ switch (wHubCharacteristics & HUB_CHAR_LPSM) {
+ case HUB_CHAR_COMMON_LPSM:
+ dev_dbg(hub_dev, "ganged power switching\n");
+ break;
+ case HUB_CHAR_INDV_PORT_LPSM:
+ dev_dbg(hub_dev, "individual port power switching\n");
+ break;
+ case HUB_CHAR_NO_LPSM:
+ case HUB_CHAR_LPSM:
+ dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
+ break;
+ }
+
+ switch (wHubCharacteristics & HUB_CHAR_OCPM) {
+ case HUB_CHAR_COMMON_OCPM:
+ dev_dbg(hub_dev, "global over-current protection\n");
+ break;
+ case HUB_CHAR_INDV_PORT_OCPM:
+ dev_dbg(hub_dev, "individual port over-current protection\n");
+ break;
+ case HUB_CHAR_NO_OCPM:
+ case HUB_CHAR_OCPM:
+ dev_dbg(hub_dev, "no over-current protection\n");
+ break;
+ }
+
+ spin_lock_init(&hub->tt.lock);
+ INIT_LIST_HEAD(&hub->tt.clear_list);
+ INIT_WORK(&hub->tt.clear_work, hub_tt_work);
+ switch (hdev->descriptor.bDeviceProtocol) {
+ case USB_HUB_PR_FS:
+ break;
+ case USB_HUB_PR_HS_SINGLE_TT:
+ dev_dbg(hub_dev, "Single TT\n");
+ hub->tt.hub = hdev;
+ break;
+ case USB_HUB_PR_HS_MULTI_TT:
+ ret = usb_set_interface(hdev, 0, 1);
+ if (ret == 0) {
+ dev_dbg(hub_dev, "TT per port\n");
+ hub->tt.multi = 1;
+ } else
+ dev_err(hub_dev, "Using single TT (err %d)\n",
+ ret);
+ hub->tt.hub = hdev;
+ break;
+ case USB_HUB_PR_SS:
+ /* USB 3.0 hubs don't have a TT */
+ break;
+ default:
+ dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
+ hdev->descriptor.bDeviceProtocol);
+ break;
+ }
+
+ /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
+ switch (wHubCharacteristics & HUB_CHAR_TTTT) {
+ case HUB_TTTT_8_BITS:
+ if (hdev->descriptor.bDeviceProtocol != 0) {
+ hub->tt.think_time = 666;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 8, hub->tt.think_time);
+ }
+ break;
+ case HUB_TTTT_16_BITS:
+ hub->tt.think_time = 666 * 2;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 16, hub->tt.think_time);
+ break;
+ case HUB_TTTT_24_BITS:
+ hub->tt.think_time = 666 * 3;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 24, hub->tt.think_time);
+ break;
+ case HUB_TTTT_32_BITS:
+ hub->tt.think_time = 666 * 4;
+ dev_dbg(hub_dev, "TT requires at most %d "
+ "FS bit times (%d ns)\n",
+ 32, hub->tt.think_time);
+ break;
+ }
+
+ /* probe() zeroes hub->indicator[] */
+ if (wHubCharacteristics & HUB_CHAR_PORTIND) {
+ hub->has_indicators = 1;
+ dev_dbg(hub_dev, "Port indicators are supported\n");
+ }
+
+ dev_dbg(hub_dev, "power on to power good time: %dms\n",
+ hub->descriptor->bPwrOn2PwrGood * 2);
+
+ /* power budgeting mostly matters with bus-powered hubs,
+ * and battery-powered root hubs (may provide just 8 mA).
+ */
+ ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
+ if (ret) {
+ message = "can't get hub status";
+ goto fail;
+ }
+ hcd = bus_to_hcd(hdev->bus);
+ if (hdev == hdev->bus->root_hub) {
+ if (hcd->power_budget > 0)
+ hdev->bus_mA = hcd->power_budget;
+ else
+ hdev->bus_mA = full_load * maxchild;
+ if (hdev->bus_mA >= full_load)
+ hub->mA_per_port = full_load;
+ else {
+ hub->mA_per_port = hdev->bus_mA;
+ hub->limited_power = 1;
+ }
+ } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
+ int remaining = hdev->bus_mA -
+ hub->descriptor->bHubContrCurrent;
+
+ dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
+ hub->descriptor->bHubContrCurrent);
+ hub->limited_power = 1;
+
+ if (remaining < maxchild * unit_load)
+ dev_warn(hub_dev,
+ "insufficient power available "
+ "to use all downstream ports\n");
+ hub->mA_per_port = unit_load; /* 7.2.1 */
+
+ } else { /* Self-powered external hub */
+ /* FIXME: What about battery-powered external hubs that
+ * provide less current per port? */
+ hub->mA_per_port = full_load;
+ }
+ if (hub->mA_per_port < full_load)
+ dev_dbg(hub_dev, "%umA bus power budget for each child\n",
+ hub->mA_per_port);
+
+ ret = hub_hub_status(hub, &hubstatus, &hubchange);
+ if (ret < 0) {
+ message = "can't get hub status";
+ goto fail;
+ }
+
+ /* local power status reports aren't always correct */
+ if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
+ dev_dbg(hub_dev, "local power source is %s\n",
+ (hubstatus & HUB_STATUS_LOCAL_POWER)
+ ? "lost (inactive)" : "good");
+
+ if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
+ dev_dbg(hub_dev, "%sover-current condition exists\n",
+ (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
+
+ /* set up the interrupt endpoint
+ * We use the EP's maxpacket size instead of (PORTS+1+7)/8
+ * bytes as USB2.0[11.12.3] says because some hubs are known
+ * to send more data (and thus cause overflow). For root hubs,
+ * maxpktsize is defined in hcd.c's fake endpoint descriptors
+ * to be big enough for at least USB_MAXCHILDREN ports. */
+ pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
+ maxp = usb_maxpacket(hdev, pipe);
+
+ if (maxp > sizeof(*hub->buffer))
+ maxp = sizeof(*hub->buffer);
+
+ hub->urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!hub->urb) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
+ hub, endpoint->bInterval);
+
+ /* maybe cycle the hub leds */
+ if (hub->has_indicators && blinkenlights)
+ hub->indicator[0] = INDICATOR_CYCLE;
+
+ mutex_lock(&usb_port_peer_mutex);
+ for (i = 0; i < maxchild; i++) {
+ ret = usb_hub_create_port_device(hub, i + 1);
+ if (ret < 0) {
+ dev_err(hub->intfdev,
+ "couldn't create port%d device.\n", i + 1);
+ break;
+ }
+ }
+ hdev->maxchild = i;
+ for (i = 0; i < hdev->maxchild; i++) {
+ struct usb_port *port_dev = hub->ports[i];
+
+ pm_runtime_put(&port_dev->dev);
+ }
+
+ mutex_unlock(&usb_port_peer_mutex);
+ if (ret < 0)
+ goto fail;
+
+ /* Update the HCD's internal representation of this hub before hub_wq
+ * starts getting port status changes for devices under the hub.
+ */
+ if (hcd->driver->update_hub_device) {
+ ret = hcd->driver->update_hub_device(hcd, hdev,
+ &hub->tt, GFP_KERNEL);
+ if (ret < 0) {
+ message = "can't update HCD hub info";
+ goto fail;
+ }
+ }
+
+ usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
+
+ hub_activate(hub, HUB_INIT);
+ return 0;
+
+fail:
+ dev_err(hub_dev, "config failed, %s (err %d)\n",
+ message, ret);
+ /* hub_disconnect() frees urb and descriptor */
+ return ret;
+}
+
+static void hub_release(struct kref *kref)
+{
+ struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
+
+ usb_put_dev(hub->hdev);
+ usb_put_intf(to_usb_interface(hub->intfdev));
+ kfree(hub);
+}
+
+static unsigned highspeed_hubs;
+
+static void hub_disconnect(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ int port1;
+
+ /*
+ * Stop adding new hub events. We do not want to block here and thus
+ * will not try to remove any pending work item.
+ */
+ hub->disconnected = 1;
+
+ /* Disconnect all children and quiesce the hub */
+ hub->error = 0;
+ hub_quiesce(hub, HUB_DISCONNECT);
+
+ mutex_lock(&usb_port_peer_mutex);
+
+ /* Avoid races with recursively_mark_NOTATTACHED() */
+ spin_lock_irq(&device_state_lock);
+ port1 = hdev->maxchild;
+ hdev->maxchild = 0;
+ usb_set_intfdata(intf, NULL);
+ spin_unlock_irq(&device_state_lock);
+
+ for (; port1 > 0; --port1)
+ usb_hub_remove_port_device(hub, port1);
+
+ mutex_unlock(&usb_port_peer_mutex);
+
+ if (hub->hdev->speed == USB_SPEED_HIGH)
+ highspeed_hubs--;
+
+ usb_free_urb(hub->urb);
+ kfree(hub->ports);
+ kfree(hub->descriptor);
+ kfree(hub->status);
+ kfree(hub->buffer);
+
+ pm_suspend_ignore_children(&intf->dev, false);
+
+ if (hub->quirk_disable_autosuspend)
+ usb_autopm_put_interface(intf);
+
+ onboard_hub_destroy_pdevs(&hub->onboard_hub_devs);
+
+ kref_put(&hub->kref, hub_release);
+}
+
+static bool hub_descriptor_is_sane(struct usb_host_interface *desc)
+{
+ /* Some hubs have a subclass of 1, which AFAICT according to the */
+ /* specs is not defined, but it works */
+ if (desc->desc.bInterfaceSubClass != 0 &&
+ desc->desc.bInterfaceSubClass != 1)
+ return false;
+
+ /* Multiple endpoints? What kind of mutant ninja-hub is this? */
+ if (desc->desc.bNumEndpoints != 1)
+ return false;
+
+ /* If the first endpoint is not interrupt IN, we'd better punt! */
+ if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc))
+ return false;
+
+ return true;
+}
+
+static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct usb_host_interface *desc;
+ struct usb_device *hdev;
+ struct usb_hub *hub;
+
+ desc = intf->cur_altsetting;
+ hdev = interface_to_usbdev(intf);
+
+ /*
+ * Set default autosuspend delay as 0 to speedup bus suspend,
+ * based on the below considerations:
+ *
+ * - Unlike other drivers, the hub driver does not rely on the
+ * autosuspend delay to provide enough time to handle a wakeup
+ * event, and the submitted status URB is just to check future
+ * change on hub downstream ports, so it is safe to do it.
+ *
+ * - The patch might cause one or more auto supend/resume for
+ * below very rare devices when they are plugged into hub
+ * first time:
+ *
+ * devices having trouble initializing, and disconnect
+ * themselves from the bus and then reconnect a second
+ * or so later
+ *
+ * devices just for downloading firmware, and disconnects
+ * themselves after completing it
+ *
+ * For these quite rare devices, their drivers may change the
+ * autosuspend delay of their parent hub in the probe() to one
+ * appropriate value to avoid the subtle problem if someone
+ * does care it.
+ *
+ * - The patch may cause one or more auto suspend/resume on
+ * hub during running 'lsusb', but it is probably too
+ * infrequent to worry about.
+ *
+ * - Change autosuspend delay of hub can avoid unnecessary auto
+ * suspend timer for hub, also may decrease power consumption
+ * of USB bus.
+ *
+ * - If user has indicated to prevent autosuspend by passing
+ * usbcore.autosuspend = -1 then keep autosuspend disabled.
+ */
+#ifdef CONFIG_PM
+ if (hdev->dev.power.autosuspend_delay >= 0)
+ pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
+#endif
+
+ /*
+ * Hubs have proper suspend/resume support, except for root hubs
+ * where the controller driver doesn't have bus_suspend and
+ * bus_resume methods.
+ */
+ if (hdev->parent) { /* normal device */
+ usb_enable_autosuspend(hdev);
+ } else { /* root hub */
+ const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver;
+
+ if (drv->bus_suspend && drv->bus_resume)
+ usb_enable_autosuspend(hdev);
+ }
+
+ if (hdev->level == MAX_TOPO_LEVEL) {
+ dev_err(&intf->dev,
+ "Unsupported bus topology: hub nested too deep\n");
+ return -E2BIG;
+ }
+
+#ifdef CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB
+ if (hdev->parent) {
+ dev_warn(&intf->dev, "ignoring external hub\n");
+ return -ENODEV;
+ }
+#endif
+
+ if (!hub_descriptor_is_sane(desc)) {
+ dev_err(&intf->dev, "bad descriptor, ignoring hub\n");
+ return -EIO;
+ }
+
+ /* We found a hub */
+ dev_info(&intf->dev, "USB hub found\n");
+
+ hub = kzalloc(sizeof(*hub), GFP_KERNEL);
+ if (!hub)
+ return -ENOMEM;
+
+ kref_init(&hub->kref);
+ hub->intfdev = &intf->dev;
+ hub->hdev = hdev;
+ INIT_DELAYED_WORK(&hub->leds, led_work);
+ INIT_DELAYED_WORK(&hub->init_work, NULL);
+ INIT_WORK(&hub->events, hub_event);
+ INIT_LIST_HEAD(&hub->onboard_hub_devs);
+ spin_lock_init(&hub->irq_urb_lock);
+ timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0);
+ usb_get_intf(intf);
+ usb_get_dev(hdev);
+
+ usb_set_intfdata(intf, hub);
+ intf->needs_remote_wakeup = 1;
+ pm_suspend_ignore_children(&intf->dev, true);
+
+ if (hdev->speed == USB_SPEED_HIGH)
+ highspeed_hubs++;
+
+ if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
+ hub->quirk_check_port_auto_suspend = 1;
+
+ if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) {
+ hub->quirk_disable_autosuspend = 1;
+ usb_autopm_get_interface_no_resume(intf);
+ }
+
+ if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) {
+ onboard_hub_create_pdevs(hdev, &hub->onboard_hub_devs);
+
+ return 0;
+ }
+
+ hub_disconnect(intf);
+ return -ENODEV;
+}
+
+static int
+hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
+{
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+
+ /* assert ifno == 0 (part of hub spec) */
+ switch (code) {
+ case USBDEVFS_HUB_PORTINFO: {
+ struct usbdevfs_hub_portinfo *info = user_data;
+ int i;
+
+ spin_lock_irq(&device_state_lock);
+ if (hdev->devnum <= 0)
+ info->nports = 0;
+ else {
+ info->nports = hdev->maxchild;
+ for (i = 0; i < info->nports; i++) {
+ if (hub->ports[i]->child == NULL)
+ info->port[i] = 0;
+ else
+ info->port[i] =
+ hub->ports[i]->child->devnum;
+ }
+ }
+ spin_unlock_irq(&device_state_lock);
+
+ return info->nports + 1;
+ }
+
+ default:
+ return -ENOSYS;
+ }
+}
+
+/*
+ * Allow user programs to claim ports on a hub. When a device is attached
+ * to one of these "claimed" ports, the program will "own" the device.
+ */
+static int find_port_owner(struct usb_device *hdev, unsigned port1,
+ struct usb_dev_state ***ppowner)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+
+ if (hdev->state == USB_STATE_NOTATTACHED)
+ return -ENODEV;
+ if (port1 == 0 || port1 > hdev->maxchild)
+ return -EINVAL;
+
+ /* Devices not managed by the hub driver
+ * will always have maxchild equal to 0.
+ */
+ *ppowner = &(hub->ports[port1 - 1]->port_owner);
+ return 0;
+}
+
+/* In the following three functions, the caller must hold hdev's lock */
+int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
+ struct usb_dev_state *owner)
+{
+ int rc;
+ struct usb_dev_state **powner;
+
+ rc = find_port_owner(hdev, port1, &powner);
+ if (rc)
+ return rc;
+ if (*powner)
+ return -EBUSY;
+ *powner = owner;
+ return rc;
+}
+EXPORT_SYMBOL_GPL(usb_hub_claim_port);
+
+int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
+ struct usb_dev_state *owner)
+{
+ int rc;
+ struct usb_dev_state **powner;
+
+ rc = find_port_owner(hdev, port1, &powner);
+ if (rc)
+ return rc;
+ if (*powner != owner)
+ return -ENOENT;
+ *powner = NULL;
+ return rc;
+}
+EXPORT_SYMBOL_GPL(usb_hub_release_port);
+
+void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+ int n;
+
+ for (n = 0; n < hdev->maxchild; n++) {
+ if (hub->ports[n]->port_owner == owner)
+ hub->ports[n]->port_owner = NULL;
+ }
+
+}
+
+/* The caller must hold udev's lock */
+bool usb_device_is_owned(struct usb_device *udev)
+{
+ struct usb_hub *hub;
+
+ if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
+ return false;
+ hub = usb_hub_to_struct_hub(udev->parent);
+ return !!hub->ports[udev->portnum - 1]->port_owner;
+}
+
+static void recursively_mark_NOTATTACHED(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev);
+ int i;
+
+ for (i = 0; i < udev->maxchild; ++i) {
+ if (hub->ports[i]->child)
+ recursively_mark_NOTATTACHED(hub->ports[i]->child);
+ }
+ if (udev->state == USB_STATE_SUSPENDED)
+ udev->active_duration -= jiffies;
+ udev->state = USB_STATE_NOTATTACHED;
+}
+
+/**
+ * usb_set_device_state - change a device's current state (usbcore, hcds)
+ * @udev: pointer to device whose state should be changed
+ * @new_state: new state value to be stored
+ *
+ * udev->state is _not_ fully protected by the device lock. Although
+ * most transitions are made only while holding the lock, the state can
+ * can change to USB_STATE_NOTATTACHED at almost any time. This
+ * is so that devices can be marked as disconnected as soon as possible,
+ * without having to wait for any semaphores to be released. As a result,
+ * all changes to any device's state must be protected by the
+ * device_state_lock spinlock.
+ *
+ * Once a device has been added to the device tree, all changes to its state
+ * should be made using this routine. The state should _not_ be set directly.
+ *
+ * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
+ * Otherwise udev->state is set to new_state, and if new_state is
+ * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
+ * to USB_STATE_NOTATTACHED.
+ */
+void usb_set_device_state(struct usb_device *udev,
+ enum usb_device_state new_state)
+{
+ unsigned long flags;
+ int wakeup = -1;
+
+ spin_lock_irqsave(&device_state_lock, flags);
+ if (udev->state == USB_STATE_NOTATTACHED)
+ ; /* do nothing */
+ else if (new_state != USB_STATE_NOTATTACHED) {
+
+ /* root hub wakeup capabilities are managed out-of-band
+ * and may involve silicon errata ... ignore them here.
+ */
+ if (udev->parent) {
+ if (udev->state == USB_STATE_SUSPENDED
+ || new_state == USB_STATE_SUSPENDED)
+ ; /* No change to wakeup settings */
+ else if (new_state == USB_STATE_CONFIGURED)
+ wakeup = (udev->quirks &
+ USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 :
+ udev->actconfig->desc.bmAttributes &
+ USB_CONFIG_ATT_WAKEUP;
+ else
+ wakeup = 0;
+ }
+ if (udev->state == USB_STATE_SUSPENDED &&
+ new_state != USB_STATE_SUSPENDED)
+ udev->active_duration -= jiffies;
+ else if (new_state == USB_STATE_SUSPENDED &&
+ udev->state != USB_STATE_SUSPENDED)
+ udev->active_duration += jiffies;
+ udev->state = new_state;
+ } else
+ recursively_mark_NOTATTACHED(udev);
+ spin_unlock_irqrestore(&device_state_lock, flags);
+ if (wakeup >= 0)
+ device_set_wakeup_capable(&udev->dev, wakeup);
+}
+EXPORT_SYMBOL_GPL(usb_set_device_state);
+
+/*
+ * Choose a device number.
+ *
+ * Device numbers are used as filenames in usbfs. On USB-1.1 and
+ * USB-2.0 buses they are also used as device addresses, however on
+ * USB-3.0 buses the address is assigned by the controller hardware
+ * and it usually is not the same as the device number.
+ *
+ * WUSB devices are simple: they have no hubs behind, so the mapping
+ * device <-> virtual port number becomes 1:1. Why? to simplify the
+ * life of the device connection logic in
+ * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
+ * handshake we need to assign a temporary address in the unauthorized
+ * space. For simplicity we use the first virtual port number found to
+ * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
+ * and that becomes it's address [X < 128] or its unauthorized address
+ * [X | 0x80].
+ *
+ * We add 1 as an offset to the one-based USB-stack port number
+ * (zero-based wusb virtual port index) for two reasons: (a) dev addr
+ * 0 is reserved by USB for default address; (b) Linux's USB stack
+ * uses always #1 for the root hub of the controller. So USB stack's
+ * port #1, which is wusb virtual-port #0 has address #2.
+ *
+ * Devices connected under xHCI are not as simple. The host controller
+ * supports virtualization, so the hardware assigns device addresses and
+ * the HCD must setup data structures before issuing a set address
+ * command to the hardware.
+ */
+static void choose_devnum(struct usb_device *udev)
+{
+ int devnum;
+ struct usb_bus *bus = udev->bus;
+
+ /* be safe when more hub events are proceed in parallel */
+ mutex_lock(&bus->devnum_next_mutex);
+ if (udev->wusb) {
+ devnum = udev->portnum + 1;
+ BUG_ON(test_bit(devnum, bus->devmap.devicemap));
+ } else {
+ /* Try to allocate the next devnum beginning at
+ * bus->devnum_next. */
+ devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
+ bus->devnum_next);
+ if (devnum >= 128)
+ devnum = find_next_zero_bit(bus->devmap.devicemap,
+ 128, 1);
+ bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
+ }
+ if (devnum < 128) {
+ set_bit(devnum, bus->devmap.devicemap);
+ udev->devnum = devnum;
+ }
+ mutex_unlock(&bus->devnum_next_mutex);
+}
+
+static void release_devnum(struct usb_device *udev)
+{
+ if (udev->devnum > 0) {
+ clear_bit(udev->devnum, udev->bus->devmap.devicemap);
+ udev->devnum = -1;
+ }
+}
+
+static void update_devnum(struct usb_device *udev, int devnum)
+{
+ /* The address for a WUSB device is managed by wusbcore. */
+ if (!udev->wusb)
+ udev->devnum = devnum;
+ if (!udev->devaddr)
+ udev->devaddr = (u8)devnum;
+}
+
+static void hub_free_dev(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /* Root hubs aren't real devices, so don't free HCD resources */
+ if (hcd->driver->free_dev && udev->parent)
+ hcd->driver->free_dev(hcd, udev);
+}
+
+static void hub_disconnect_children(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev);
+ int i;
+
+ /* Free up all the children before we remove this device */
+ for (i = 0; i < udev->maxchild; i++) {
+ if (hub->ports[i]->child)
+ usb_disconnect(&hub->ports[i]->child);
+ }
+}
+
+/**
+ * usb_disconnect - disconnect a device (usbcore-internal)
+ * @pdev: pointer to device being disconnected
+ *
+ * Context: task context, might sleep
+ *
+ * Something got disconnected. Get rid of it and all of its children.
+ *
+ * If *pdev is a normal device then the parent hub must already be locked.
+ * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock,
+ * which protects the set of root hubs as well as the list of buses.
+ *
+ * Only hub drivers (including virtual root hub drivers for host
+ * controllers) should ever call this.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ */
+void usb_disconnect(struct usb_device **pdev)
+{
+ struct usb_port *port_dev = NULL;
+ struct usb_device *udev = *pdev;
+ struct usb_hub *hub = NULL;
+ int port1 = 1;
+
+ /* mark the device as inactive, so any further urb submissions for
+ * this device (and any of its children) will fail immediately.
+ * this quiesces everything except pending urbs.
+ */
+ usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+ dev_info(&udev->dev, "USB disconnect, device number %d\n",
+ udev->devnum);
+
+ /*
+ * Ensure that the pm runtime code knows that the USB device
+ * is in the process of being disconnected.
+ */
+ pm_runtime_barrier(&udev->dev);
+
+ usb_lock_device(udev);
+
+ hub_disconnect_children(udev);
+
+ /* deallocate hcd/hardware state ... nuking all pending urbs and
+ * cleaning up all state associated with the current configuration
+ * so that the hardware is now fully quiesced.
+ */
+ dev_dbg(&udev->dev, "unregistering device\n");
+ usb_disable_device(udev, 0);
+ usb_hcd_synchronize_unlinks(udev);
+
+ if (udev->parent) {
+ port1 = udev->portnum;
+ hub = usb_hub_to_struct_hub(udev->parent);
+ port_dev = hub->ports[port1 - 1];
+
+ sysfs_remove_link(&udev->dev.kobj, "port");
+ sysfs_remove_link(&port_dev->dev.kobj, "device");
+
+ /*
+ * As usb_port_runtime_resume() de-references udev, make
+ * sure no resumes occur during removal
+ */
+ if (!test_and_set_bit(port1, hub->child_usage_bits))
+ pm_runtime_get_sync(&port_dev->dev);
+ }
+
+ usb_remove_ep_devs(&udev->ep0);
+ usb_unlock_device(udev);
+
+ /* Unregister the device. The device driver is responsible
+ * for de-configuring the device and invoking the remove-device
+ * notifier chain (used by usbfs and possibly others).
+ */
+ device_del(&udev->dev);
+
+ /* Free the device number and delete the parent's children[]
+ * (or root_hub) pointer.
+ */
+ release_devnum(udev);
+
+ /* Avoid races with recursively_mark_NOTATTACHED() */
+ spin_lock_irq(&device_state_lock);
+ *pdev = NULL;
+ spin_unlock_irq(&device_state_lock);
+
+ if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits))
+ pm_runtime_put(&port_dev->dev);
+
+ hub_free_dev(udev);
+
+ put_device(&udev->dev);
+}
+
+#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
+static void show_string(struct usb_device *udev, char *id, char *string)
+{
+ if (!string)
+ return;
+ dev_info(&udev->dev, "%s: %s\n", id, string);
+}
+
+static void announce_device(struct usb_device *udev)
+{
+ u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice);
+
+ dev_info(&udev->dev,
+ "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n",
+ le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct),
+ bcdDevice >> 8, bcdDevice & 0xff);
+ dev_info(&udev->dev,
+ "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
+ udev->descriptor.iManufacturer,
+ udev->descriptor.iProduct,
+ udev->descriptor.iSerialNumber);
+ show_string(udev, "Product", udev->product);
+ show_string(udev, "Manufacturer", udev->manufacturer);
+ show_string(udev, "SerialNumber", udev->serial);
+}
+#else
+static inline void announce_device(struct usb_device *udev) { }
+#endif
+
+
+/**
+ * usb_enumerate_device_otg - FIXME (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * Finish enumeration for On-The-Go devices
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+static int usb_enumerate_device_otg(struct usb_device *udev)
+{
+ int err = 0;
+
+#ifdef CONFIG_USB_OTG
+ /*
+ * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
+ * to wake us after we've powered off VBUS; and HNP, switching roles
+ * "host" to "peripheral". The OTG descriptor helps figure this out.
+ */
+ if (!udev->bus->is_b_host
+ && udev->config
+ && udev->parent == udev->bus->root_hub) {
+ struct usb_otg_descriptor *desc = NULL;
+ struct usb_bus *bus = udev->bus;
+ unsigned port1 = udev->portnum;
+
+ /* descriptor may appear anywhere in config */
+ err = __usb_get_extra_descriptor(udev->rawdescriptors[0],
+ le16_to_cpu(udev->config[0].desc.wTotalLength),
+ USB_DT_OTG, (void **) &desc, sizeof(*desc));
+ if (err || !(desc->bmAttributes & USB_OTG_HNP))
+ return 0;
+
+ dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n",
+ (port1 == bus->otg_port) ? "" : "non-");
+
+ /* enable HNP before suspend, it's simpler */
+ if (port1 == bus->otg_port) {
+ bus->b_hnp_enable = 1;
+ err = usb_control_msg(udev,
+ usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, 0,
+ USB_DEVICE_B_HNP_ENABLE,
+ 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (err < 0) {
+ /*
+ * OTG MESSAGE: report errors here,
+ * customize to match your product.
+ */
+ dev_err(&udev->dev, "can't set HNP mode: %d\n",
+ err);
+ bus->b_hnp_enable = 0;
+ }
+ } else if (desc->bLength == sizeof
+ (struct usb_otg_descriptor)) {
+ /* Set a_alt_hnp_support for legacy otg device */
+ err = usb_control_msg(udev,
+ usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, 0,
+ USB_DEVICE_A_ALT_HNP_SUPPORT,
+ 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (err < 0)
+ dev_err(&udev->dev,
+ "set a_alt_hnp_support failed: %d\n",
+ err);
+ }
+ }
+#endif
+ return err;
+}
+
+
+/**
+ * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is only called by usb_new_device() -- all comments that apply there
+ * apply here wrt to environment.
+ *
+ * If the device is WUSB and not authorized, we don't attempt to read
+ * the string descriptors, as they will be errored out by the device
+ * until it has been authorized.
+ *
+ * Return: 0 if successful. A negative error code otherwise.
+ */
+static int usb_enumerate_device(struct usb_device *udev)
+{
+ int err;
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ if (udev->config == NULL) {
+ err = usb_get_configuration(udev);
+ if (err < 0) {
+ if (err != -ENODEV)
+ dev_err(&udev->dev, "can't read configurations, error %d\n",
+ err);
+ return err;
+ }
+ }
+
+ /* read the standard strings and cache them if present */
+ udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
+ udev->manufacturer = usb_cache_string(udev,
+ udev->descriptor.iManufacturer);
+ udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
+
+ err = usb_enumerate_device_otg(udev);
+ if (err < 0)
+ return err;
+
+ if (IS_ENABLED(CONFIG_USB_OTG_PRODUCTLIST) && hcd->tpl_support &&
+ !is_targeted(udev)) {
+ /* Maybe it can talk to us, though we can't talk to it.
+ * (Includes HNP test device.)
+ */
+ if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable
+ || udev->bus->is_b_host)) {
+ err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND);
+ if (err < 0)
+ dev_dbg(&udev->dev, "HNP fail, %d\n", err);
+ }
+ return -ENOTSUPP;
+ }
+
+ usb_detect_interface_quirks(udev);
+
+ return 0;
+}
+
+static void set_usb_port_removable(struct usb_device *udev)
+{
+ struct usb_device *hdev = udev->parent;
+ struct usb_hub *hub;
+ u8 port = udev->portnum;
+ u16 wHubCharacteristics;
+ bool removable = true;
+
+ dev_set_removable(&udev->dev, DEVICE_REMOVABLE_UNKNOWN);
+
+ if (!hdev)
+ return;
+
+ hub = usb_hub_to_struct_hub(udev->parent);
+
+ /*
+ * If the platform firmware has provided information about a port,
+ * use that to determine whether it's removable.
+ */
+ switch (hub->ports[udev->portnum - 1]->connect_type) {
+ case USB_PORT_CONNECT_TYPE_HOT_PLUG:
+ dev_set_removable(&udev->dev, DEVICE_REMOVABLE);
+ return;
+ case USB_PORT_CONNECT_TYPE_HARD_WIRED:
+ case USB_PORT_NOT_USED:
+ dev_set_removable(&udev->dev, DEVICE_FIXED);
+ return;
+ default:
+ break;
+ }
+
+ /*
+ * Otherwise, check whether the hub knows whether a port is removable
+ * or not
+ */
+ wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
+
+ if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
+ return;
+
+ if (hub_is_superspeed(hdev)) {
+ if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
+ & (1 << port))
+ removable = false;
+ } else {
+ if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
+ removable = false;
+ }
+
+ if (removable)
+ dev_set_removable(&udev->dev, DEVICE_REMOVABLE);
+ else
+ dev_set_removable(&udev->dev, DEVICE_FIXED);
+
+}
+
+/**
+ * usb_new_device - perform initial device setup (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is called with devices which have been detected but not fully
+ * enumerated. The device descriptor is available, but not descriptors
+ * for any device configuration. The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
+ * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to
+ * udev has already been installed, but udev is not yet visible through
+ * sysfs or other filesystem code.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ *
+ * Only the hub driver or root-hub registrar should ever call this.
+ *
+ * Return: Whether the device is configured properly or not. Zero if the
+ * interface was registered with the driver core; else a negative errno
+ * value.
+ *
+ */
+int usb_new_device(struct usb_device *udev)
+{
+ int err;
+
+ if (udev->parent) {
+ /* Initialize non-root-hub device wakeup to disabled;
+ * device (un)configuration controls wakeup capable
+ * sysfs power/wakeup controls wakeup enabled/disabled
+ */
+ device_init_wakeup(&udev->dev, 0);
+ }
+
+ /* Tell the runtime-PM framework the device is active */
+ pm_runtime_set_active(&udev->dev);
+ pm_runtime_get_noresume(&udev->dev);
+ pm_runtime_use_autosuspend(&udev->dev);
+ pm_runtime_enable(&udev->dev);
+
+ /* By default, forbid autosuspend for all devices. It will be
+ * allowed for hubs during binding.
+ */
+ usb_disable_autosuspend(udev);
+
+ err = usb_enumerate_device(udev); /* Read descriptors */
+ if (err < 0)
+ goto fail;
+ dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
+ udev->devnum, udev->bus->busnum,
+ (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
+ /* export the usbdev device-node for libusb */
+ udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
+ (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
+
+ /* Tell the world! */
+ announce_device(udev);
+
+ if (udev->serial)
+ add_device_randomness(udev->serial, strlen(udev->serial));
+ if (udev->product)
+ add_device_randomness(udev->product, strlen(udev->product));
+ if (udev->manufacturer)
+ add_device_randomness(udev->manufacturer,
+ strlen(udev->manufacturer));
+
+ device_enable_async_suspend(&udev->dev);
+
+ /* check whether the hub or firmware marks this port as non-removable */
+ set_usb_port_removable(udev);
+
+ /* Register the device. The device driver is responsible
+ * for configuring the device and invoking the add-device
+ * notifier chain (used by usbfs and possibly others).
+ */
+ err = device_add(&udev->dev);
+ if (err) {
+ dev_err(&udev->dev, "can't device_add, error %d\n", err);
+ goto fail;
+ }
+
+ /* Create link files between child device and usb port device. */
+ if (udev->parent) {
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+ int port1 = udev->portnum;
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+
+ err = sysfs_create_link(&udev->dev.kobj,
+ &port_dev->dev.kobj, "port");
+ if (err)
+ goto fail;
+
+ err = sysfs_create_link(&port_dev->dev.kobj,
+ &udev->dev.kobj, "device");
+ if (err) {
+ sysfs_remove_link(&udev->dev.kobj, "port");
+ goto fail;
+ }
+
+ if (!test_and_set_bit(port1, hub->child_usage_bits))
+ pm_runtime_get_sync(&port_dev->dev);
+ }
+
+ (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
+ usb_mark_last_busy(udev);
+ pm_runtime_put_sync_autosuspend(&udev->dev);
+ return err;
+
+fail:
+ usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+ pm_runtime_disable(&udev->dev);
+ pm_runtime_set_suspended(&udev->dev);
+ return err;
+}
+
+
+/**
+ * usb_deauthorize_device - deauthorize a device (usbcore-internal)
+ * @usb_dev: USB device
+ *
+ * Move the USB device to a very basic state where interfaces are disabled
+ * and the device is in fact unconfigured and unusable.
+ *
+ * We share a lock (that we have) with device_del(), so we need to
+ * defer its call.
+ *
+ * Return: 0.
+ */
+int usb_deauthorize_device(struct usb_device *usb_dev)
+{
+ usb_lock_device(usb_dev);
+ if (usb_dev->authorized == 0)
+ goto out_unauthorized;
+
+ usb_dev->authorized = 0;
+ usb_set_configuration(usb_dev, -1);
+
+out_unauthorized:
+ usb_unlock_device(usb_dev);
+ return 0;
+}
+
+
+int usb_authorize_device(struct usb_device *usb_dev)
+{
+ int result = 0, c;
+
+ usb_lock_device(usb_dev);
+ if (usb_dev->authorized == 1)
+ goto out_authorized;
+
+ result = usb_autoresume_device(usb_dev);
+ if (result < 0) {
+ dev_err(&usb_dev->dev,
+ "can't autoresume for authorization: %d\n", result);
+ goto error_autoresume;
+ }
+
+ if (usb_dev->wusb) {
+ struct usb_device_descriptor *descr;
+
+ descr = usb_get_device_descriptor(usb_dev);
+ if (IS_ERR(descr)) {
+ result = PTR_ERR(descr);
+ dev_err(&usb_dev->dev, "can't re-read device descriptor for "
+ "authorization: %d\n", result);
+ goto error_device_descriptor;
+ }
+ usb_dev->descriptor = *descr;
+ kfree(descr);
+ }
+
+ usb_dev->authorized = 1;
+ /* Choose and set the configuration. This registers the interfaces
+ * with the driver core and lets interface drivers bind to them.
+ */
+ c = usb_choose_configuration(usb_dev);
+ if (c >= 0) {
+ result = usb_set_configuration(usb_dev, c);
+ if (result) {
+ dev_err(&usb_dev->dev,
+ "can't set config #%d, error %d\n", c, result);
+ /* This need not be fatal. The user can try to
+ * set other configurations. */
+ }
+ }
+ dev_info(&usb_dev->dev, "authorized to connect\n");
+
+error_device_descriptor:
+ usb_autosuspend_device(usb_dev);
+error_autoresume:
+out_authorized:
+ usb_unlock_device(usb_dev); /* complements locktree */
+ return result;
+}
+
+/**
+ * get_port_ssp_rate - Match the extended port status to SSP rate
+ * @hdev: The hub device
+ * @ext_portstatus: extended port status
+ *
+ * Match the extended port status speed id to the SuperSpeed Plus sublink speed
+ * capability attributes. Base on the number of connected lanes and speed,
+ * return the corresponding enum usb_ssp_rate.
+ */
+static enum usb_ssp_rate get_port_ssp_rate(struct usb_device *hdev,
+ u32 ext_portstatus)
+{
+ struct usb_ssp_cap_descriptor *ssp_cap;
+ u32 attr;
+ u8 speed_id;
+ u8 ssac;
+ u8 lanes;
+ int i;
+
+ if (!hdev->bos)
+ goto out;
+
+ ssp_cap = hdev->bos->ssp_cap;
+ if (!ssp_cap)
+ goto out;
+
+ speed_id = ext_portstatus & USB_EXT_PORT_STAT_RX_SPEED_ID;
+ lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1;
+
+ ssac = le32_to_cpu(ssp_cap->bmAttributes) &
+ USB_SSP_SUBLINK_SPEED_ATTRIBS;
+
+ for (i = 0; i <= ssac; i++) {
+ u8 ssid;
+
+ attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]);
+ ssid = FIELD_GET(USB_SSP_SUBLINK_SPEED_SSID, attr);
+ if (speed_id == ssid) {
+ u16 mantissa;
+ u8 lse;
+ u8 type;
+
+ /*
+ * Note: currently asymmetric lane types are only
+ * applicable for SSIC operate in SuperSpeed protocol
+ */
+ type = FIELD_GET(USB_SSP_SUBLINK_SPEED_ST, attr);
+ if (type == USB_SSP_SUBLINK_SPEED_ST_ASYM_RX ||
+ type == USB_SSP_SUBLINK_SPEED_ST_ASYM_TX)
+ goto out;
+
+ if (FIELD_GET(USB_SSP_SUBLINK_SPEED_LP, attr) !=
+ USB_SSP_SUBLINK_SPEED_LP_SSP)
+ goto out;
+
+ lse = FIELD_GET(USB_SSP_SUBLINK_SPEED_LSE, attr);
+ mantissa = FIELD_GET(USB_SSP_SUBLINK_SPEED_LSM, attr);
+
+ /* Convert to Gbps */
+ for (; lse < USB_SSP_SUBLINK_SPEED_LSE_GBPS; lse++)
+ mantissa /= 1000;
+
+ if (mantissa >= 10 && lanes == 1)
+ return USB_SSP_GEN_2x1;
+
+ if (mantissa >= 10 && lanes == 2)
+ return USB_SSP_GEN_2x2;
+
+ if (mantissa >= 5 && lanes == 2)
+ return USB_SSP_GEN_1x2;
+
+ goto out;
+ }
+ }
+
+out:
+ return USB_SSP_GEN_UNKNOWN;
+}
+
+/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
+static unsigned hub_is_wusb(struct usb_hub *hub)
+{
+ struct usb_hcd *hcd;
+ if (hub->hdev->parent != NULL) /* not a root hub? */
+ return 0;
+ hcd = bus_to_hcd(hub->hdev->bus);
+ return hcd->wireless;
+}
+
+
+#ifdef CONFIG_USB_FEW_INIT_RETRIES
+#define PORT_RESET_TRIES 2
+#define SET_ADDRESS_TRIES 1
+#define GET_DESCRIPTOR_TRIES 1
+#define GET_MAXPACKET0_TRIES 1
+#define PORT_INIT_TRIES 4
+
+#else
+#define PORT_RESET_TRIES 5
+#define SET_ADDRESS_TRIES 2
+#define GET_DESCRIPTOR_TRIES 2
+#define GET_MAXPACKET0_TRIES 3
+#define PORT_INIT_TRIES 4
+#endif /* CONFIG_USB_FEW_INIT_RETRIES */
+
+#define DETECT_DISCONNECT_TRIES 5
+
+#define HUB_ROOT_RESET_TIME 60 /* times are in msec */
+#define HUB_SHORT_RESET_TIME 10
+#define HUB_BH_RESET_TIME 50
+#define HUB_LONG_RESET_TIME 200
+#define HUB_RESET_TIMEOUT 800
+
+static bool use_new_scheme(struct usb_device *udev, int retry,
+ struct usb_port *port_dev)
+{
+ int old_scheme_first_port =
+ (port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME) ||
+ old_scheme_first;
+
+ /*
+ * "New scheme" enumeration causes an extra state transition to be
+ * exposed to an xhci host and causes USB3 devices to receive control
+ * commands in the default state. This has been seen to cause
+ * enumeration failures, so disable this enumeration scheme for USB3
+ * devices.
+ */
+ if (udev->speed >= USB_SPEED_SUPER)
+ return false;
+
+ /*
+ * If use_both_schemes is set, use the first scheme (whichever
+ * it is) for the larger half of the retries, then use the other
+ * scheme. Otherwise, use the first scheme for all the retries.
+ */
+ if (use_both_schemes && retry >= (PORT_INIT_TRIES + 1) / 2)
+ return old_scheme_first_port; /* Second half */
+ return !old_scheme_first_port; /* First half or all */
+}
+
+/* Is a USB 3.0 port in the Inactive or Compliance Mode state?
+ * Port warm reset is required to recover
+ */
+static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
+ u16 portstatus)
+{
+ u16 link_state;
+
+ if (!hub_is_superspeed(hub->hdev))
+ return false;
+
+ if (test_bit(port1, hub->warm_reset_bits))
+ return true;
+
+ link_state = portstatus & USB_PORT_STAT_LINK_STATE;
+ return link_state == USB_SS_PORT_LS_SS_INACTIVE
+ || link_state == USB_SS_PORT_LS_COMP_MOD;
+}
+
+static int hub_port_wait_reset(struct usb_hub *hub, int port1,
+ struct usb_device *udev, unsigned int delay, bool warm)
+{
+ int delay_time, ret;
+ u16 portstatus;
+ u16 portchange;
+ u32 ext_portstatus = 0;
+
+ for (delay_time = 0;
+ delay_time < HUB_RESET_TIMEOUT;
+ delay_time += delay) {
+ /* wait to give the device a chance to reset */
+ msleep(delay);
+
+ /* read and decode port status */
+ if (hub_is_superspeedplus(hub->hdev))
+ ret = hub_ext_port_status(hub, port1,
+ HUB_EXT_PORT_STATUS,
+ &portstatus, &portchange,
+ &ext_portstatus);
+ else
+ ret = usb_hub_port_status(hub, port1, &portstatus,
+ &portchange);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The port state is unknown until the reset completes.
+ *
+ * On top of that, some chips may require additional time
+ * to re-establish a connection after the reset is complete,
+ * so also wait for the connection to be re-established.
+ */
+ if (!(portstatus & USB_PORT_STAT_RESET) &&
+ (portstatus & USB_PORT_STAT_CONNECTION))
+ break;
+
+ /* switch to the long delay after two short delay failures */
+ if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
+ delay = HUB_LONG_RESET_TIME;
+
+ dev_dbg(&hub->ports[port1 - 1]->dev,
+ "not %sreset yet, waiting %dms\n",
+ warm ? "warm " : "", delay);
+ }
+
+ if ((portstatus & USB_PORT_STAT_RESET))
+ return -EBUSY;
+
+ if (hub_port_warm_reset_required(hub, port1, portstatus))
+ return -ENOTCONN;
+
+ /* Device went away? */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION))
+ return -ENOTCONN;
+
+ /* Retry if connect change is set but status is still connected.
+ * A USB 3.0 connection may bounce if multiple warm resets were issued,
+ * but the device may have successfully re-connected. Ignore it.
+ */
+ if (!hub_is_superspeed(hub->hdev) &&
+ (portchange & USB_PORT_STAT_C_CONNECTION)) {
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+ return -EAGAIN;
+ }
+
+ if (!(portstatus & USB_PORT_STAT_ENABLE))
+ return -EBUSY;
+
+ if (!udev)
+ return 0;
+
+ if (hub_is_superspeedplus(hub->hdev)) {
+ /* extended portstatus Rx and Tx lane count are zero based */
+ udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1;
+ udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1;
+ udev->ssp_rate = get_port_ssp_rate(hub->hdev, ext_portstatus);
+ } else {
+ udev->rx_lanes = 1;
+ udev->tx_lanes = 1;
+ udev->ssp_rate = USB_SSP_GEN_UNKNOWN;
+ }
+ if (hub_is_wusb(hub))
+ udev->speed = USB_SPEED_WIRELESS;
+ else if (udev->ssp_rate != USB_SSP_GEN_UNKNOWN)
+ udev->speed = USB_SPEED_SUPER_PLUS;
+ else if (hub_is_superspeed(hub->hdev))
+ udev->speed = USB_SPEED_SUPER;
+ else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+ udev->speed = USB_SPEED_HIGH;
+ else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+ udev->speed = USB_SPEED_LOW;
+ else
+ udev->speed = USB_SPEED_FULL;
+ return 0;
+}
+
+/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
+static int hub_port_reset(struct usb_hub *hub, int port1,
+ struct usb_device *udev, unsigned int delay, bool warm)
+{
+ int i, status;
+ u16 portchange, portstatus;
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ int reset_recovery_time;
+
+ if (!hub_is_superspeed(hub->hdev)) {
+ if (warm) {
+ dev_err(hub->intfdev, "only USB3 hub support "
+ "warm reset\n");
+ return -EINVAL;
+ }
+ /* Block EHCI CF initialization during the port reset.
+ * Some companion controllers don't like it when they mix.
+ */
+ down_read(&ehci_cf_port_reset_rwsem);
+ } else if (!warm) {
+ /*
+ * If the caller hasn't explicitly requested a warm reset,
+ * double check and see if one is needed.
+ */
+ if (usb_hub_port_status(hub, port1, &portstatus,
+ &portchange) == 0)
+ if (hub_port_warm_reset_required(hub, port1,
+ portstatus))
+ warm = true;
+ }
+ clear_bit(port1, hub->warm_reset_bits);
+
+ /* Reset the port */
+ for (i = 0; i < PORT_RESET_TRIES; i++) {
+ status = set_port_feature(hub->hdev, port1, (warm ?
+ USB_PORT_FEAT_BH_PORT_RESET :
+ USB_PORT_FEAT_RESET));
+ if (status == -ENODEV) {
+ ; /* The hub is gone */
+ } else if (status) {
+ dev_err(&port_dev->dev,
+ "cannot %sreset (err = %d)\n",
+ warm ? "warm " : "", status);
+ } else {
+ status = hub_port_wait_reset(hub, port1, udev, delay,
+ warm);
+ if (status && status != -ENOTCONN && status != -ENODEV)
+ dev_dbg(hub->intfdev,
+ "port_wait_reset: err = %d\n",
+ status);
+ }
+
+ /*
+ * Check for disconnect or reset, and bail out after several
+ * reset attempts to avoid warm reset loop.
+ */
+ if (status == 0 || status == -ENOTCONN || status == -ENODEV ||
+ (status == -EBUSY && i == PORT_RESET_TRIES - 1)) {
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_RESET);
+
+ if (!hub_is_superspeed(hub->hdev))
+ goto done;
+
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_BH_PORT_RESET);
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_PORT_LINK_STATE);
+
+ if (udev)
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+
+ /*
+ * If a USB 3.0 device migrates from reset to an error
+ * state, re-issue the warm reset.
+ */
+ if (usb_hub_port_status(hub, port1,
+ &portstatus, &portchange) < 0)
+ goto done;
+
+ if (!hub_port_warm_reset_required(hub, port1,
+ portstatus))
+ goto done;
+
+ /*
+ * If the port is in SS.Inactive or Compliance Mode, the
+ * hot or warm reset failed. Try another warm reset.
+ */
+ if (!warm) {
+ dev_dbg(&port_dev->dev,
+ "hot reset failed, warm reset\n");
+ warm = true;
+ }
+ }
+
+ dev_dbg(&port_dev->dev,
+ "not enabled, trying %sreset again...\n",
+ warm ? "warm " : "");
+ delay = HUB_LONG_RESET_TIME;
+ }
+
+ dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n");
+
+done:
+ if (status == 0) {
+ if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM)
+ usleep_range(10000, 12000);
+ else {
+ /* TRSTRCY = 10 ms; plus some extra */
+ reset_recovery_time = 10 + 40;
+
+ /* Hub needs extra delay after resetting its port. */
+ if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET)
+ reset_recovery_time += 100;
+
+ msleep(reset_recovery_time);
+ }
+
+ if (udev) {
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ update_devnum(udev, 0);
+ /* The xHC may think the device is already reset,
+ * so ignore the status.
+ */
+ if (hcd->driver->reset_device)
+ hcd->driver->reset_device(hcd, udev);
+
+ usb_set_device_state(udev, USB_STATE_DEFAULT);
+ }
+ } else {
+ if (udev)
+ usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+ }
+
+ if (!hub_is_superspeed(hub->hdev))
+ up_read(&ehci_cf_port_reset_rwsem);
+
+ return status;
+}
+
+/* Check if a port is power on */
+int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus)
+{
+ int ret = 0;
+
+ if (hub_is_superspeed(hub->hdev)) {
+ if (portstatus & USB_SS_PORT_STAT_POWER)
+ ret = 1;
+ } else {
+ if (portstatus & USB_PORT_STAT_POWER)
+ ret = 1;
+ }
+
+ return ret;
+}
+
+static void usb_lock_port(struct usb_port *port_dev)
+ __acquires(&port_dev->status_lock)
+{
+ mutex_lock(&port_dev->status_lock);
+ __acquire(&port_dev->status_lock);
+}
+
+static void usb_unlock_port(struct usb_port *port_dev)
+ __releases(&port_dev->status_lock)
+{
+ mutex_unlock(&port_dev->status_lock);
+ __release(&port_dev->status_lock);
+}
+
+#ifdef CONFIG_PM
+
+/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
+static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
+{
+ int ret = 0;
+
+ if (hub_is_superspeed(hub->hdev)) {
+ if ((portstatus & USB_PORT_STAT_LINK_STATE)
+ == USB_SS_PORT_LS_U3)
+ ret = 1;
+ } else {
+ if (portstatus & USB_PORT_STAT_SUSPEND)
+ ret = 1;
+ }
+
+ return ret;
+}
+
+/* Determine whether the device on a port is ready for a normal resume,
+ * is ready for a reset-resume, or should be disconnected.
+ */
+static int check_port_resume_type(struct usb_device *udev,
+ struct usb_hub *hub, int port1,
+ int status, u16 portchange, u16 portstatus)
+{
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ int retries = 3;
+
+ retry:
+ /* Is a warm reset needed to recover the connection? */
+ if (status == 0 && udev->reset_resume
+ && hub_port_warm_reset_required(hub, port1, portstatus)) {
+ /* pass */;
+ }
+ /* Is the device still present? */
+ else if (status || port_is_suspended(hub, portstatus) ||
+ !usb_port_is_power_on(hub, portstatus)) {
+ if (status >= 0)
+ status = -ENODEV;
+ } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
+ if (retries--) {
+ usleep_range(200, 300);
+ status = usb_hub_port_status(hub, port1, &portstatus,
+ &portchange);
+ goto retry;
+ }
+ status = -ENODEV;
+ }
+
+ /* Can't do a normal resume if the port isn't enabled,
+ * so try a reset-resume instead.
+ */
+ else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
+ if (udev->persist_enabled)
+ udev->reset_resume = 1;
+ else
+ status = -ENODEV;
+ }
+
+ if (status) {
+ dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n",
+ portchange, portstatus, status);
+ } else if (udev->reset_resume) {
+
+ /* Late port handoff can set status-change bits */
+ if (portchange & USB_PORT_STAT_C_CONNECTION)
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+ if (portchange & USB_PORT_STAT_C_ENABLE)
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_ENABLE);
+
+ /*
+ * Whatever made this reset-resume necessary may have
+ * turned on the port1 bit in hub->change_bits. But after
+ * a successful reset-resume we want the bit to be clear;
+ * if it was on it would indicate that something happened
+ * following the reset-resume.
+ */
+ clear_bit(port1, hub->change_bits);
+ }
+
+ return status;
+}
+
+int usb_disable_ltm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /* Check if the roothub and device supports LTM. */
+ if (!usb_device_supports_ltm(hcd->self.root_hub) ||
+ !usb_device_supports_ltm(udev))
+ return 0;
+
+ /* Clear Feature LTM Enable can only be sent if the device is
+ * configured.
+ */
+ if (!udev->actconfig)
+ return 0;
+
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(usb_disable_ltm);
+
+void usb_enable_ltm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /* Check if the roothub and device supports LTM. */
+ if (!usb_device_supports_ltm(hcd->self.root_hub) ||
+ !usb_device_supports_ltm(udev))
+ return;
+
+ /* Set Feature LTM Enable can only be sent if the device is
+ * configured.
+ */
+ if (!udev->actconfig)
+ return;
+
+ usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+EXPORT_SYMBOL_GPL(usb_enable_ltm);
+
+/*
+ * usb_enable_remote_wakeup - enable remote wakeup for a device
+ * @udev: target device
+ *
+ * For USB-2 devices: Set the device's remote wakeup feature.
+ *
+ * For USB-3 devices: Assume there's only one function on the device and
+ * enable remote wake for the first interface. FIXME if the interface
+ * association descriptor shows there's more than one function.
+ */
+static int usb_enable_remote_wakeup(struct usb_device *udev)
+{
+ if (udev->speed < USB_SPEED_SUPER)
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ else
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
+ USB_INTRF_FUNC_SUSPEND,
+ USB_INTRF_FUNC_SUSPEND_RW |
+ USB_INTRF_FUNC_SUSPEND_LP,
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
+}
+
+/*
+ * usb_disable_remote_wakeup - disable remote wakeup for a device
+ * @udev: target device
+ *
+ * For USB-2 devices: Clear the device's remote wakeup feature.
+ *
+ * For USB-3 devices: Assume there's only one function on the device and
+ * disable remote wake for the first interface. FIXME if the interface
+ * association descriptor shows there's more than one function.
+ */
+static int usb_disable_remote_wakeup(struct usb_device *udev)
+{
+ if (udev->speed < USB_SPEED_SUPER)
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
+ USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ else
+ return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
+ USB_INTRF_FUNC_SUSPEND, 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+}
+
+/* Count of wakeup-enabled devices at or below udev */
+unsigned usb_wakeup_enabled_descendants(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev);
+
+ return udev->do_remote_wakeup +
+ (hub ? hub->wakeup_enabled_descendants : 0);
+}
+EXPORT_SYMBOL_GPL(usb_wakeup_enabled_descendants);
+
+/*
+ * usb_port_suspend - suspend a usb device's upstream port
+ * @udev: device that's no longer in active use, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * Suspends a USB device that isn't in active use, conserving power.
+ * Devices may wake out of a suspend, if anything important happens,
+ * using the remote wakeup mechanism. They may also be taken out of
+ * suspend by the host, using usb_port_resume(). It's also routine
+ * to disconnect devices while they are suspended.
+ *
+ * This only affects the USB hardware for a device; its interfaces
+ * (and, for hubs, child devices) must already have been suspended.
+ *
+ * Selective port suspend reduces power; most suspended devices draw
+ * less than 500 uA. It's also used in OTG, along with remote wakeup.
+ * All devices below the suspended port are also suspended.
+ *
+ * Devices leave suspend state when the host wakes them up. Some devices
+ * also support "remote wakeup", where the device can activate the USB
+ * tree above them to deliver data, such as a keypress or packet. In
+ * some cases, this wakes the USB host.
+ *
+ * Suspending OTG devices may trigger HNP, if that's been enabled
+ * between a pair of dual-role devices. That will change roles, such
+ * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
+ *
+ * Devices on USB hub ports have only one "suspend" state, corresponding
+ * to ACPI D2, "may cause the device to lose some context".
+ * State transitions include:
+ *
+ * - suspend, resume ... when the VBUS power link stays live
+ * - suspend, disconnect ... VBUS lost
+ *
+ * Once VBUS drop breaks the circuit, the port it's using has to go through
+ * normal re-enumeration procedures, starting with enabling VBUS power.
+ * Other than re-initializing the hub (plug/unplug, except for root hubs),
+ * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq
+ * timer, no SRP, no requests through sysfs.
+ *
+ * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
+ * suspended until their bus goes into global suspend (i.e., the root
+ * hub is suspended). Nevertheless, we change @udev->state to
+ * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
+ * upstream port setting is stored in @udev->port_is_suspended.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+ struct usb_port *port_dev = hub->ports[udev->portnum - 1];
+ int port1 = udev->portnum;
+ int status;
+ bool really_suspend = true;
+
+ usb_lock_port(port_dev);
+
+ /* enable remote wakeup when appropriate; this lets the device
+ * wake up the upstream hub (including maybe the root hub).
+ *
+ * NOTE: OTG devices may issue remote wakeup (or SRP) even when
+ * we don't explicitly enable it here.
+ */
+ if (udev->do_remote_wakeup) {
+ status = usb_enable_remote_wakeup(udev);
+ if (status) {
+ dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
+ status);
+ /* bail if autosuspend is requested */
+ if (PMSG_IS_AUTO(msg))
+ goto err_wakeup;
+ }
+ }
+
+ /* disable USB2 hardware LPM */
+ usb_disable_usb2_hardware_lpm(udev);
+
+ if (usb_disable_ltm(udev)) {
+ dev_err(&udev->dev, "Failed to disable LTM before suspend\n");
+ status = -ENOMEM;
+ if (PMSG_IS_AUTO(msg))
+ goto err_ltm;
+ }
+
+ /* see 7.1.7.6 */
+ if (hub_is_superspeed(hub->hdev))
+ status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3);
+
+ /*
+ * For system suspend, we do not need to enable the suspend feature
+ * on individual USB-2 ports. The devices will automatically go
+ * into suspend a few ms after the root hub stops sending packets.
+ * The USB 2.0 spec calls this "global suspend".
+ *
+ * However, many USB hubs have a bug: They don't relay wakeup requests
+ * from a downstream port if the port's suspend feature isn't on.
+ * Therefore we will turn on the suspend feature if udev or any of its
+ * descendants is enabled for remote wakeup.
+ */
+ else if (PMSG_IS_AUTO(msg) || usb_wakeup_enabled_descendants(udev) > 0)
+ status = set_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_SUSPEND);
+ else {
+ really_suspend = false;
+ status = 0;
+ }
+ if (status) {
+ /* Check if the port has been suspended for the timeout case
+ * to prevent the suspended port from incorrect handling.
+ */
+ if (status == -ETIMEDOUT) {
+ int ret;
+ u16 portstatus, portchange;
+
+ portstatus = portchange = 0;
+ ret = usb_hub_port_status(hub, port1, &portstatus,
+ &portchange);
+
+ dev_dbg(&port_dev->dev,
+ "suspend timeout, status %04x\n", portstatus);
+
+ if (ret == 0 && port_is_suspended(hub, portstatus)) {
+ status = 0;
+ goto suspend_done;
+ }
+ }
+
+ dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status);
+
+ /* Try to enable USB3 LTM again */
+ usb_enable_ltm(udev);
+ err_ltm:
+ /* Try to enable USB2 hardware LPM again */
+ usb_enable_usb2_hardware_lpm(udev);
+
+ if (udev->do_remote_wakeup)
+ (void) usb_disable_remote_wakeup(udev);
+ err_wakeup:
+
+ /* System sleep transitions should never fail */
+ if (!PMSG_IS_AUTO(msg))
+ status = 0;
+ } else {
+ suspend_done:
+ dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
+ (PMSG_IS_AUTO(msg) ? "auto-" : ""),
+ udev->do_remote_wakeup);
+ if (really_suspend) {
+ udev->port_is_suspended = 1;
+
+ /* device has up to 10 msec to fully suspend */
+ msleep(10);
+ }
+ usb_set_device_state(udev, USB_STATE_SUSPENDED);
+ }
+
+ if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled
+ && test_and_clear_bit(port1, hub->child_usage_bits))
+ pm_runtime_put_sync(&port_dev->dev);
+
+ usb_mark_last_busy(hub->hdev);
+
+ usb_unlock_port(port_dev);
+ return status;
+}
+
+/*
+ * If the USB "suspend" state is in use (rather than "global suspend"),
+ * many devices will be individually taken out of suspend state using
+ * special "resume" signaling. This routine kicks in shortly after
+ * hardware resume signaling is finished, either because of selective
+ * resume (by host) or remote wakeup (by device) ... now see what changed
+ * in the tree that's rooted at this device.
+ *
+ * If @udev->reset_resume is set then the device is reset before the
+ * status check is done.
+ */
+static int finish_port_resume(struct usb_device *udev)
+{
+ int status = 0;
+ u16 devstatus = 0;
+
+ /* caller owns the udev device lock */
+ dev_dbg(&udev->dev, "%s\n",
+ udev->reset_resume ? "finish reset-resume" : "finish resume");
+
+ /* usb ch9 identifies four variants of SUSPENDED, based on what
+ * state the device resumes to. Linux currently won't see the
+ * first two on the host side; they'd be inside hub_port_init()
+ * during many timeouts, but hub_wq can't suspend until later.
+ */
+ usb_set_device_state(udev, udev->actconfig
+ ? USB_STATE_CONFIGURED
+ : USB_STATE_ADDRESS);
+
+ /* 10.5.4.5 says not to reset a suspended port if the attached
+ * device is enabled for remote wakeup. Hence the reset
+ * operation is carried out here, after the port has been
+ * resumed.
+ */
+ if (udev->reset_resume) {
+ /*
+ * If the device morphs or switches modes when it is reset,
+ * we don't want to perform a reset-resume. We'll fail the
+ * resume, which will cause a logical disconnect, and then
+ * the device will be rediscovered.
+ */
+ retry_reset_resume:
+ if (udev->quirks & USB_QUIRK_RESET)
+ status = -ENODEV;
+ else
+ status = usb_reset_and_verify_device(udev);
+ }
+
+ /* 10.5.4.5 says be sure devices in the tree are still there.
+ * For now let's assume the device didn't go crazy on resume,
+ * and device drivers will know about any resume quirks.
+ */
+ if (status == 0) {
+ devstatus = 0;
+ status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+
+ /* If a normal resume failed, try doing a reset-resume */
+ if (status && !udev->reset_resume && udev->persist_enabled) {
+ dev_dbg(&udev->dev, "retry with reset-resume\n");
+ udev->reset_resume = 1;
+ goto retry_reset_resume;
+ }
+ }
+
+ if (status) {
+ dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
+ status);
+ /*
+ * There are a few quirky devices which violate the standard
+ * by claiming to have remote wakeup enabled after a reset,
+ * which crash if the feature is cleared, hence check for
+ * udev->reset_resume
+ */
+ } else if (udev->actconfig && !udev->reset_resume) {
+ if (udev->speed < USB_SPEED_SUPER) {
+ if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
+ status = usb_disable_remote_wakeup(udev);
+ } else {
+ status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0,
+ &devstatus);
+ if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP
+ | USB_INTRF_STAT_FUNC_RW))
+ status = usb_disable_remote_wakeup(udev);
+ }
+
+ if (status)
+ dev_dbg(&udev->dev,
+ "disable remote wakeup, status %d\n",
+ status);
+ status = 0;
+ }
+ return status;
+}
+
+/*
+ * There are some SS USB devices which take longer time for link training.
+ * XHCI specs 4.19.4 says that when Link training is successful, port
+ * sets CCS bit to 1. So if SW reads port status before successful link
+ * training, then it will not find device to be present.
+ * USB Analyzer log with such buggy devices show that in some cases
+ * device switch on the RX termination after long delay of host enabling
+ * the VBUS. In few other cases it has been seen that device fails to
+ * negotiate link training in first attempt. It has been
+ * reported till now that few devices take as long as 2000 ms to train
+ * the link after host enabling its VBUS and termination. Following
+ * routine implements a 2000 ms timeout for link training. If in a case
+ * link trains before timeout, loop will exit earlier.
+ *
+ * There are also some 2.0 hard drive based devices and 3.0 thumb
+ * drives that, when plugged into a 2.0 only port, take a long
+ * time to set CCS after VBUS enable.
+ *
+ * FIXME: If a device was connected before suspend, but was removed
+ * while system was asleep, then the loop in the following routine will
+ * only exit at timeout.
+ *
+ * This routine should only be called when persist is enabled.
+ */
+static int wait_for_connected(struct usb_device *udev,
+ struct usb_hub *hub, int port1,
+ u16 *portchange, u16 *portstatus)
+{
+ int status = 0, delay_ms = 0;
+
+ while (delay_ms < 2000) {
+ if (status || *portstatus & USB_PORT_STAT_CONNECTION)
+ break;
+ if (!usb_port_is_power_on(hub, *portstatus)) {
+ status = -ENODEV;
+ break;
+ }
+ msleep(20);
+ delay_ms += 20;
+ status = usb_hub_port_status(hub, port1, portstatus, portchange);
+ }
+ dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms);
+ return status;
+}
+
+/*
+ * usb_port_resume - re-activate a suspended usb device's upstream port
+ * @udev: device to re-activate, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * This will re-activate the suspended device, increasing power usage
+ * while letting drivers communicate again with its endpoints.
+ * USB resume explicitly guarantees that the power session between
+ * the host and the device is the same as it was when the device
+ * suspended.
+ *
+ * If @udev->reset_resume is set then this routine won't check that the
+ * port is still enabled. Furthermore, finish_port_resume() above will
+ * reset @udev. The end result is that a broken power session can be
+ * recovered and @udev will appear to persist across a loss of VBUS power.
+ *
+ * For example, if a host controller doesn't maintain VBUS suspend current
+ * during a system sleep or is reset when the system wakes up, all the USB
+ * power sessions below it will be broken. This is especially troublesome
+ * for mass-storage devices containing mounted filesystems, since the
+ * device will appear to have disconnected and all the memory mappings
+ * to it will be lost. Using the USB_PERSIST facility, the device can be
+ * made to appear as if it had not disconnected.
+ *
+ * This facility can be dangerous. Although usb_reset_and_verify_device() makes
+ * every effort to insure that the same device is present after the
+ * reset as before, it cannot provide a 100% guarantee. Furthermore it's
+ * quite possible for a device to remain unaltered but its media to be
+ * changed. If the user replaces a flash memory card while the system is
+ * asleep, he will have only himself to blame when the filesystem on the
+ * new card is corrupted and the system crashes.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_port_resume(struct usb_device *udev, pm_message_t msg)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+ struct usb_port *port_dev = hub->ports[udev->portnum - 1];
+ int port1 = udev->portnum;
+ int status;
+ u16 portchange, portstatus;
+
+ if (!test_and_set_bit(port1, hub->child_usage_bits)) {
+ status = pm_runtime_resume_and_get(&port_dev->dev);
+ if (status < 0) {
+ dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
+ status);
+ return status;
+ }
+ }
+
+ usb_lock_port(port_dev);
+
+ /* Skip the initial Clear-Suspend step for a remote wakeup */
+ status = usb_hub_port_status(hub, port1, &portstatus, &portchange);
+ if (status == 0 && !port_is_suspended(hub, portstatus)) {
+ if (portchange & USB_PORT_STAT_C_SUSPEND)
+ pm_wakeup_event(&udev->dev, 0);
+ goto SuspendCleared;
+ }
+
+ /* see 7.1.7.7; affects power usage, but not budgeting */
+ if (hub_is_superspeed(hub->hdev))
+ status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0);
+ else
+ status = usb_clear_port_feature(hub->hdev,
+ port1, USB_PORT_FEAT_SUSPEND);
+ if (status) {
+ dev_dbg(&port_dev->dev, "can't resume, status %d\n", status);
+ } else {
+ /* drive resume for USB_RESUME_TIMEOUT msec */
+ dev_dbg(&udev->dev, "usb %sresume\n",
+ (PMSG_IS_AUTO(msg) ? "auto-" : ""));
+ msleep(USB_RESUME_TIMEOUT);
+
+ /* Virtual root hubs can trigger on GET_PORT_STATUS to
+ * stop resume signaling. Then finish the resume
+ * sequence.
+ */
+ status = usb_hub_port_status(hub, port1, &portstatus, &portchange);
+ }
+
+ SuspendCleared:
+ if (status == 0) {
+ udev->port_is_suspended = 0;
+ if (hub_is_superspeed(hub->hdev)) {
+ if (portchange & USB_PORT_STAT_C_LINK_STATE)
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_PORT_LINK_STATE);
+ } else {
+ if (portchange & USB_PORT_STAT_C_SUSPEND)
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_SUSPEND);
+ }
+
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+ }
+
+ if (udev->persist_enabled)
+ status = wait_for_connected(udev, hub, port1, &portchange,
+ &portstatus);
+
+ status = check_port_resume_type(udev,
+ hub, port1, status, portchange, portstatus);
+ if (status == 0)
+ status = finish_port_resume(udev);
+ if (status < 0) {
+ dev_dbg(&udev->dev, "can't resume, status %d\n", status);
+ hub_port_logical_disconnect(hub, port1);
+ } else {
+ /* Try to enable USB2 hardware LPM */
+ usb_enable_usb2_hardware_lpm(udev);
+
+ /* Try to enable USB3 LTM */
+ usb_enable_ltm(udev);
+ }
+
+ usb_unlock_port(port_dev);
+
+ return status;
+}
+
+int usb_remote_wakeup(struct usb_device *udev)
+{
+ int status = 0;
+
+ usb_lock_device(udev);
+ if (udev->state == USB_STATE_SUSPENDED) {
+ dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
+ status = usb_autoresume_device(udev);
+ if (status == 0) {
+ /* Let the drivers do their thing, then... */
+ usb_autosuspend_device(udev);
+ }
+ }
+ usb_unlock_device(udev);
+ return status;
+}
+
+/* Returns 1 if there was a remote wakeup and a connect status change. */
+static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
+ u16 portstatus, u16 portchange)
+ __must_hold(&port_dev->status_lock)
+{
+ struct usb_port *port_dev = hub->ports[port - 1];
+ struct usb_device *hdev;
+ struct usb_device *udev;
+ int connect_change = 0;
+ u16 link_state;
+ int ret;
+
+ hdev = hub->hdev;
+ udev = port_dev->child;
+ if (!hub_is_superspeed(hdev)) {
+ if (!(portchange & USB_PORT_STAT_C_SUSPEND))
+ return 0;
+ usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
+ } else {
+ link_state = portstatus & USB_PORT_STAT_LINK_STATE;
+ if (!udev || udev->state != USB_STATE_SUSPENDED ||
+ (link_state != USB_SS_PORT_LS_U0 &&
+ link_state != USB_SS_PORT_LS_U1 &&
+ link_state != USB_SS_PORT_LS_U2))
+ return 0;
+ }
+
+ if (udev) {
+ /* TRSMRCY = 10 msec */
+ msleep(10);
+
+ usb_unlock_port(port_dev);
+ ret = usb_remote_wakeup(udev);
+ usb_lock_port(port_dev);
+ if (ret < 0)
+ connect_change = 1;
+ } else {
+ ret = -ENODEV;
+ hub_port_disable(hub, port, 1);
+ }
+ dev_dbg(&port_dev->dev, "resume, status %d\n", ret);
+ return connect_change;
+}
+
+static int check_ports_changed(struct usb_hub *hub)
+{
+ int port1;
+
+ for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) {
+ u16 portstatus, portchange;
+ int status;
+
+ status = usb_hub_port_status(hub, port1, &portstatus, &portchange);
+ if (!status && portchange)
+ return 1;
+ }
+ return 0;
+}
+
+static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+ struct usb_device *hdev = hub->hdev;
+ unsigned port1;
+
+ /*
+ * Warn if children aren't already suspended.
+ * Also, add up the number of wakeup-enabled descendants.
+ */
+ hub->wakeup_enabled_descendants = 0;
+ for (port1 = 1; port1 <= hdev->maxchild; port1++) {
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+
+ if (udev && udev->can_submit) {
+ dev_warn(&port_dev->dev, "device %s not suspended yet\n",
+ dev_name(&udev->dev));
+ if (PMSG_IS_AUTO(msg))
+ return -EBUSY;
+ }
+ if (udev)
+ hub->wakeup_enabled_descendants +=
+ usb_wakeup_enabled_descendants(udev);
+ }
+
+ if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) {
+ /* check if there are changes pending on hub ports */
+ if (check_ports_changed(hub)) {
+ if (PMSG_IS_AUTO(msg))
+ return -EBUSY;
+ pm_wakeup_event(&hdev->dev, 2000);
+ }
+ }
+
+ if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
+ /* Enable hub to send remote wakeup for all ports. */
+ for (port1 = 1; port1 <= hdev->maxchild; port1++) {
+ set_port_feature(hdev,
+ port1 |
+ USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
+ USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
+ USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
+ USB_PORT_FEAT_REMOTE_WAKE_MASK);
+ }
+ }
+
+ dev_dbg(&intf->dev, "%s\n", __func__);
+
+ /* stop hub_wq and related activity */
+ hub_quiesce(hub, HUB_SUSPEND);
+ return 0;
+}
+
+/* Report wakeup requests from the ports of a resuming root hub */
+static void report_wakeup_requests(struct usb_hub *hub)
+{
+ struct usb_device *hdev = hub->hdev;
+ struct usb_device *udev;
+ struct usb_hcd *hcd;
+ unsigned long resuming_ports;
+ int i;
+
+ if (hdev->parent)
+ return; /* Not a root hub */
+
+ hcd = bus_to_hcd(hdev->bus);
+ if (hcd->driver->get_resuming_ports) {
+
+ /*
+ * The get_resuming_ports() method returns a bitmap (origin 0)
+ * of ports which have started wakeup signaling but have not
+ * yet finished resuming. During system resume we will
+ * resume all the enabled ports, regardless of any wakeup
+ * signals, which means the wakeup requests would be lost.
+ * To prevent this, report them to the PM core here.
+ */
+ resuming_ports = hcd->driver->get_resuming_ports(hcd);
+ for (i = 0; i < hdev->maxchild; ++i) {
+ if (test_bit(i, &resuming_ports)) {
+ udev = hub->ports[i]->child;
+ if (udev)
+ pm_wakeup_event(&udev->dev, 0);
+ }
+ }
+ }
+}
+
+static int hub_resume(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+
+ dev_dbg(&intf->dev, "%s\n", __func__);
+ hub_activate(hub, HUB_RESUME);
+
+ /*
+ * This should be called only for system resume, not runtime resume.
+ * We can't tell the difference here, so some wakeup requests will be
+ * reported at the wrong time or more than once. This shouldn't
+ * matter much, so long as they do get reported.
+ */
+ report_wakeup_requests(hub);
+ return 0;
+}
+
+static int hub_reset_resume(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+
+ dev_dbg(&intf->dev, "%s\n", __func__);
+ hub_activate(hub, HUB_RESET_RESUME);
+ return 0;
+}
+
+/**
+ * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
+ * @rhdev: struct usb_device for the root hub
+ *
+ * The USB host controller driver calls this function when its root hub
+ * is resumed and Vbus power has been interrupted or the controller
+ * has been reset. The routine marks @rhdev as having lost power.
+ * When the hub driver is resumed it will take notice and carry out
+ * power-session recovery for all the "USB-PERSIST"-enabled child devices;
+ * the others will be disconnected.
+ */
+void usb_root_hub_lost_power(struct usb_device *rhdev)
+{
+ dev_notice(&rhdev->dev, "root hub lost power or was reset\n");
+ rhdev->reset_resume = 1;
+}
+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
+
+static const char * const usb3_lpm_names[] = {
+ "U0",
+ "U1",
+ "U2",
+ "U3",
+};
+
+/*
+ * Send a Set SEL control transfer to the device, prior to enabling
+ * device-initiated U1 or U2. This lets the device know the exit latencies from
+ * the time the device initiates a U1 or U2 exit, to the time it will receive a
+ * packet from the host.
+ *
+ * This function will fail if the SEL or PEL values for udev are greater than
+ * the maximum allowed values for the link state to be enabled.
+ */
+static int usb_req_set_sel(struct usb_device *udev)
+{
+ struct usb_set_sel_req *sel_values;
+ unsigned long long u1_sel;
+ unsigned long long u1_pel;
+ unsigned long long u2_sel;
+ unsigned long long u2_pel;
+ int ret;
+
+ if (!udev->parent || udev->speed < USB_SPEED_SUPER || !udev->lpm_capable)
+ return 0;
+
+ /* Convert SEL and PEL stored in ns to us */
+ u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
+ u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
+ u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
+ u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
+
+ /*
+ * Make sure that the calculated SEL and PEL values for the link
+ * state we're enabling aren't bigger than the max SEL/PEL
+ * value that will fit in the SET SEL control transfer.
+ * Otherwise the device would get an incorrect idea of the exit
+ * latency for the link state, and could start a device-initiated
+ * U1/U2 when the exit latencies are too high.
+ */
+ if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
+ u1_pel > USB3_LPM_MAX_U1_SEL_PEL ||
+ u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
+ u2_pel > USB3_LPM_MAX_U2_SEL_PEL) {
+ dev_dbg(&udev->dev, "Device-initiated U1/U2 disabled due to long SEL or PEL\n");
+ return -EINVAL;
+ }
+
+ /*
+ * usb_enable_lpm() can be called as part of a failed device reset,
+ * which may be initiated by an error path of a mass storage driver.
+ * Therefore, use GFP_NOIO.
+ */
+ sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
+ if (!sel_values)
+ return -ENOMEM;
+
+ sel_values->u1_sel = u1_sel;
+ sel_values->u1_pel = u1_pel;
+ sel_values->u2_sel = cpu_to_le16(u2_sel);
+ sel_values->u2_pel = cpu_to_le16(u2_pel);
+
+ ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_SEL,
+ USB_RECIP_DEVICE,
+ 0, 0,
+ sel_values, sizeof *(sel_values),
+ USB_CTRL_SET_TIMEOUT);
+ kfree(sel_values);
+
+ if (ret > 0)
+ udev->lpm_devinit_allow = 1;
+
+ return ret;
+}
+
+/*
+ * Enable or disable device-initiated U1 or U2 transitions.
+ */
+static int usb_set_device_initiated_lpm(struct usb_device *udev,
+ enum usb3_link_state state, bool enable)
+{
+ int ret;
+ int feature;
+
+ switch (state) {
+ case USB3_LPM_U1:
+ feature = USB_DEVICE_U1_ENABLE;
+ break;
+ case USB3_LPM_U2:
+ feature = USB_DEVICE_U2_ENABLE;
+ break;
+ default:
+ dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
+ __func__, enable ? "enable" : "disable");
+ return -EINVAL;
+ }
+
+ if (udev->state != USB_STATE_CONFIGURED) {
+ dev_dbg(&udev->dev, "%s: Can't %s %s state "
+ "for unconfigured device.\n",
+ __func__, enable ? "enable" : "disable",
+ usb3_lpm_names[state]);
+ return 0;
+ }
+
+ if (enable) {
+ /*
+ * Now send the control transfer to enable device-initiated LPM
+ * for either U1 or U2.
+ */
+ ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_FEATURE,
+ USB_RECIP_DEVICE,
+ feature,
+ 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ } else {
+ ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_CLEAR_FEATURE,
+ USB_RECIP_DEVICE,
+ feature,
+ 0, NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ }
+ if (ret < 0) {
+ dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
+ enable ? "Enable" : "Disable",
+ usb3_lpm_names[state]);
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static int usb_set_lpm_timeout(struct usb_device *udev,
+ enum usb3_link_state state, int timeout)
+{
+ int ret;
+ int feature;
+
+ switch (state) {
+ case USB3_LPM_U1:
+ feature = USB_PORT_FEAT_U1_TIMEOUT;
+ break;
+ case USB3_LPM_U2:
+ feature = USB_PORT_FEAT_U2_TIMEOUT;
+ break;
+ default:
+ dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
+ timeout != USB3_LPM_DEVICE_INITIATED) {
+ dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
+ "which is a reserved value.\n",
+ usb3_lpm_names[state], timeout);
+ return -EINVAL;
+ }
+
+ ret = set_port_feature(udev->parent,
+ USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
+ feature);
+ if (ret < 0) {
+ dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
+ "error code %i\n", usb3_lpm_names[state],
+ timeout, ret);
+ return -EBUSY;
+ }
+ if (state == USB3_LPM_U1)
+ udev->u1_params.timeout = timeout;
+ else
+ udev->u2_params.timeout = timeout;
+ return 0;
+}
+
+/*
+ * Don't allow device intiated U1/U2 if the system exit latency + one bus
+ * interval is greater than the minimum service interval of any active
+ * periodic endpoint. See USB 3.2 section 9.4.9
+ */
+static bool usb_device_may_initiate_lpm(struct usb_device *udev,
+ enum usb3_link_state state)
+{
+ unsigned int sel; /* us */
+ int i, j;
+
+ if (!udev->lpm_devinit_allow)
+ return false;
+
+ if (state == USB3_LPM_U1)
+ sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
+ else if (state == USB3_LPM_U2)
+ sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
+ else
+ return false;
+
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ struct usb_interface *intf;
+ struct usb_endpoint_descriptor *desc;
+ unsigned int interval;
+
+ intf = udev->actconfig->interface[i];
+ if (!intf)
+ continue;
+
+ for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) {
+ desc = &intf->cur_altsetting->endpoint[j].desc;
+
+ if (usb_endpoint_xfer_int(desc) ||
+ usb_endpoint_xfer_isoc(desc)) {
+ interval = (1 << (desc->bInterval - 1)) * 125;
+ if (sel + 125 > interval)
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+/*
+ * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
+ * U1/U2 entry.
+ *
+ * We will attempt to enable U1 or U2, but there are no guarantees that the
+ * control transfers to set the hub timeout or enable device-initiated U1/U2
+ * will be successful.
+ *
+ * If the control transfer to enable device-initiated U1/U2 entry fails, then
+ * hub-initiated U1/U2 will be disabled.
+ *
+ * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
+ * driver know about it. If that call fails, it should be harmless, and just
+ * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
+ */
+static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
+ enum usb3_link_state state)
+{
+ int timeout;
+ __u8 u1_mel;
+ __le16 u2_mel;
+
+ /* Skip if the device BOS descriptor couldn't be read */
+ if (!udev->bos)
+ return;
+
+ u1_mel = udev->bos->ss_cap->bU1devExitLat;
+ u2_mel = udev->bos->ss_cap->bU2DevExitLat;
+
+ /* If the device says it doesn't have *any* exit latency to come out of
+ * U1 or U2, it's probably lying. Assume it doesn't implement that link
+ * state.
+ */
+ if ((state == USB3_LPM_U1 && u1_mel == 0) ||
+ (state == USB3_LPM_U2 && u2_mel == 0))
+ return;
+
+ /* We allow the host controller to set the U1/U2 timeout internally
+ * first, so that it can change its schedule to account for the
+ * additional latency to send data to a device in a lower power
+ * link state.
+ */
+ timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);
+
+ /* xHCI host controller doesn't want to enable this LPM state. */
+ if (timeout == 0)
+ return;
+
+ if (timeout < 0) {
+ dev_warn(&udev->dev, "Could not enable %s link state, "
+ "xHCI error %i.\n", usb3_lpm_names[state],
+ timeout);
+ return;
+ }
+
+ if (usb_set_lpm_timeout(udev, state, timeout)) {
+ /* If we can't set the parent hub U1/U2 timeout,
+ * device-initiated LPM won't be allowed either, so let the xHCI
+ * host know that this link state won't be enabled.
+ */
+ hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
+ return;
+ }
+
+ /* Only a configured device will accept the Set Feature
+ * U1/U2_ENABLE
+ */
+ if (udev->actconfig &&
+ usb_device_may_initiate_lpm(udev, state)) {
+ if (usb_set_device_initiated_lpm(udev, state, true)) {
+ /*
+ * Request to enable device initiated U1/U2 failed,
+ * better to turn off lpm in this case.
+ */
+ usb_set_lpm_timeout(udev, state, 0);
+ hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
+ return;
+ }
+ }
+
+ if (state == USB3_LPM_U1)
+ udev->usb3_lpm_u1_enabled = 1;
+ else if (state == USB3_LPM_U2)
+ udev->usb3_lpm_u2_enabled = 1;
+}
+/*
+ * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
+ * U1/U2 entry.
+ *
+ * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
+ * If zero is returned, the parent will not allow the link to go into U1/U2.
+ *
+ * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
+ * it won't have an effect on the bus link state because the parent hub will
+ * still disallow device-initiated U1/U2 entry.
+ *
+ * If zero is returned, the xHCI host controller may still think U1/U2 entry is
+ * possible. The result will be slightly more bus bandwidth will be taken up
+ * (to account for U1/U2 exit latency), but it should be harmless.
+ */
+static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
+ enum usb3_link_state state)
+{
+ switch (state) {
+ case USB3_LPM_U1:
+ case USB3_LPM_U2:
+ break;
+ default:
+ dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ if (usb_set_lpm_timeout(udev, state, 0))
+ return -EBUSY;
+
+ usb_set_device_initiated_lpm(udev, state, false);
+
+ if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
+ dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
+ "bus schedule bandwidth may be impacted.\n",
+ usb3_lpm_names[state]);
+
+ /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM
+ * is disabled. Hub will disallows link to enter U1/U2 as well,
+ * even device is initiating LPM. Hence LPM is disabled if hub LPM
+ * timeout set to 0, no matter device-initiated LPM is disabled or
+ * not.
+ */
+ if (state == USB3_LPM_U1)
+ udev->usb3_lpm_u1_enabled = 0;
+ else if (state == USB3_LPM_U2)
+ udev->usb3_lpm_u2_enabled = 0;
+
+ return 0;
+}
+
+/*
+ * Disable hub-initiated and device-initiated U1 and U2 entry.
+ * Caller must own the bandwidth_mutex.
+ *
+ * This will call usb_enable_lpm() on failure, which will decrement
+ * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
+ */
+int usb_disable_lpm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd;
+
+ if (!udev || !udev->parent ||
+ udev->speed < USB_SPEED_SUPER ||
+ !udev->lpm_capable ||
+ udev->state < USB_STATE_CONFIGURED)
+ return 0;
+
+ hcd = bus_to_hcd(udev->bus);
+ if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
+ return 0;
+
+ udev->lpm_disable_count++;
+ if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
+ return 0;
+
+ /* If LPM is enabled, attempt to disable it. */
+ if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
+ goto enable_lpm;
+ if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
+ goto enable_lpm;
+
+ return 0;
+
+enable_lpm:
+ usb_enable_lpm(udev);
+ return -EBUSY;
+}
+EXPORT_SYMBOL_GPL(usb_disable_lpm);
+
+/* Grab the bandwidth_mutex before calling usb_disable_lpm() */
+int usb_unlocked_disable_lpm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+ int ret;
+
+ if (!hcd)
+ return -EINVAL;
+
+ mutex_lock(hcd->bandwidth_mutex);
+ ret = usb_disable_lpm(udev);
+ mutex_unlock(hcd->bandwidth_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
+
+/*
+ * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
+ * xHCI host policy may prevent U1 or U2 from being enabled.
+ *
+ * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
+ * until the lpm_disable_count drops to zero. Caller must own the
+ * bandwidth_mutex.
+ */
+void usb_enable_lpm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd;
+ struct usb_hub *hub;
+ struct usb_port *port_dev;
+
+ if (!udev || !udev->parent ||
+ udev->speed < USB_SPEED_SUPER ||
+ !udev->lpm_capable ||
+ udev->state < USB_STATE_CONFIGURED)
+ return;
+
+ udev->lpm_disable_count--;
+ hcd = bus_to_hcd(udev->bus);
+ /* Double check that we can both enable and disable LPM.
+ * Device must be configured to accept set feature U1/U2 timeout.
+ */
+ if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
+ !hcd->driver->disable_usb3_lpm_timeout)
+ return;
+
+ if (udev->lpm_disable_count > 0)
+ return;
+
+ hub = usb_hub_to_struct_hub(udev->parent);
+ if (!hub)
+ return;
+
+ port_dev = hub->ports[udev->portnum - 1];
+
+ if (port_dev->usb3_lpm_u1_permit)
+ usb_enable_link_state(hcd, udev, USB3_LPM_U1);
+
+ if (port_dev->usb3_lpm_u2_permit)
+ usb_enable_link_state(hcd, udev, USB3_LPM_U2);
+}
+EXPORT_SYMBOL_GPL(usb_enable_lpm);
+
+/* Grab the bandwidth_mutex before calling usb_enable_lpm() */
+void usb_unlocked_enable_lpm(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ if (!hcd)
+ return;
+
+ mutex_lock(hcd->bandwidth_mutex);
+ usb_enable_lpm(udev);
+ mutex_unlock(hcd->bandwidth_mutex);
+}
+EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
+
+/* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */
+static void hub_usb3_port_prepare_disable(struct usb_hub *hub,
+ struct usb_port *port_dev)
+{
+ struct usb_device *udev = port_dev->child;
+ int ret;
+
+ if (udev && udev->port_is_suspended && udev->do_remote_wakeup) {
+ ret = hub_set_port_link_state(hub, port_dev->portnum,
+ USB_SS_PORT_LS_U0);
+ if (!ret) {
+ msleep(USB_RESUME_TIMEOUT);
+ ret = usb_disable_remote_wakeup(udev);
+ }
+ if (ret)
+ dev_warn(&udev->dev,
+ "Port disable: can't disable remote wake\n");
+ udev->do_remote_wakeup = 0;
+ }
+}
+
+#else /* CONFIG_PM */
+
+#define hub_suspend NULL
+#define hub_resume NULL
+#define hub_reset_resume NULL
+
+static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub,
+ struct usb_port *port_dev) { }
+
+int usb_disable_lpm(struct usb_device *udev)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_disable_lpm);
+
+void usb_enable_lpm(struct usb_device *udev) { }
+EXPORT_SYMBOL_GPL(usb_enable_lpm);
+
+int usb_unlocked_disable_lpm(struct usb_device *udev)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
+
+void usb_unlocked_enable_lpm(struct usb_device *udev) { }
+EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
+
+int usb_disable_ltm(struct usb_device *udev)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_disable_ltm);
+
+void usb_enable_ltm(struct usb_device *udev) { }
+EXPORT_SYMBOL_GPL(usb_enable_ltm);
+
+static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
+ u16 portstatus, u16 portchange)
+{
+ return 0;
+}
+
+static int usb_req_set_sel(struct usb_device *udev)
+{
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+
+/*
+ * USB-3 does not have a similar link state as USB-2 that will avoid negotiating
+ * a connection with a plugged-in cable but will signal the host when the cable
+ * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices
+ */
+static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
+{
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *hdev = hub->hdev;
+ int ret = 0;
+
+ if (!hub->error) {
+ if (hub_is_superspeed(hub->hdev)) {
+ hub_usb3_port_prepare_disable(hub, port_dev);
+ ret = hub_set_port_link_state(hub, port_dev->portnum,
+ USB_SS_PORT_LS_U3);
+ } else {
+ ret = usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_ENABLE);
+ }
+ }
+ if (port_dev->child && set_state)
+ usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED);
+ if (ret && ret != -ENODEV)
+ dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret);
+ return ret;
+}
+
+/*
+ * usb_port_disable - disable a usb device's upstream port
+ * @udev: device to disable
+ * Context: @udev locked, must be able to sleep.
+ *
+ * Disables a USB device that isn't in active use.
+ */
+int usb_port_disable(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+
+ return hub_port_disable(hub, udev->portnum, 0);
+}
+
+/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
+ *
+ * Between connect detection and reset signaling there must be a delay
+ * of 100ms at least for debounce and power-settling. The corresponding
+ * timer shall restart whenever the downstream port detects a disconnect.
+ *
+ * Apparently there are some bluetooth and irda-dongles and a number of
+ * low-speed devices for which this debounce period may last over a second.
+ * Not covered by the spec - but easy to deal with.
+ *
+ * This implementation uses a 1500ms total debounce timeout; if the
+ * connection isn't stable by then it returns -ETIMEDOUT. It checks
+ * every 25ms for transient disconnects. When the port status has been
+ * unchanged for 100ms it returns the port status.
+ */
+int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected)
+{
+ int ret;
+ u16 portchange, portstatus;
+ unsigned connection = 0xffff;
+ int total_time, stable_time = 0;
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+
+ for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
+ ret = usb_hub_port_status(hub, port1, &portstatus, &portchange);
+ if (ret < 0)
+ return ret;
+
+ if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
+ (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
+ if (!must_be_connected ||
+ (connection == USB_PORT_STAT_CONNECTION))
+ stable_time += HUB_DEBOUNCE_STEP;
+ if (stable_time >= HUB_DEBOUNCE_STABLE)
+ break;
+ } else {
+ stable_time = 0;
+ connection = portstatus & USB_PORT_STAT_CONNECTION;
+ }
+
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ usb_clear_port_feature(hub->hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+ }
+
+ if (total_time >= HUB_DEBOUNCE_TIMEOUT)
+ break;
+ msleep(HUB_DEBOUNCE_STEP);
+ }
+
+ dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n",
+ total_time, stable_time, portstatus);
+
+ if (stable_time < HUB_DEBOUNCE_STABLE)
+ return -ETIMEDOUT;
+ return portstatus;
+}
+
+void usb_ep0_reinit(struct usb_device *udev)
+{
+ usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
+ usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
+ usb_enable_endpoint(udev, &udev->ep0, true);
+}
+EXPORT_SYMBOL_GPL(usb_ep0_reinit);
+
+#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
+#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
+
+static int hub_set_address(struct usb_device *udev, int devnum)
+{
+ int retval;
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ /*
+ * The host controller will choose the device address,
+ * instead of the core having chosen it earlier
+ */
+ if (!hcd->driver->address_device && devnum <= 1)
+ return -EINVAL;
+ if (udev->state == USB_STATE_ADDRESS)
+ return 0;
+ if (udev->state != USB_STATE_DEFAULT)
+ return -EINVAL;
+ if (hcd->driver->address_device)
+ retval = hcd->driver->address_device(hcd, udev);
+ else
+ retval = usb_control_msg(udev, usb_sndaddr0pipe(),
+ USB_REQ_SET_ADDRESS, 0, devnum, 0,
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
+ if (retval == 0) {
+ update_devnum(udev, devnum);
+ /* Device now using proper address. */
+ usb_set_device_state(udev, USB_STATE_ADDRESS);
+ usb_ep0_reinit(udev);
+ }
+ return retval;
+}
+
+/*
+ * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
+ * when they're plugged into a USB 2.0 port, but they don't work when LPM is
+ * enabled.
+ *
+ * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
+ * device says it supports the new USB 2.0 Link PM errata by setting the BESL
+ * support bit in the BOS descriptor.
+ */
+static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+ int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
+
+ if (!udev->usb2_hw_lpm_capable || !udev->bos)
+ return;
+
+ if (hub)
+ connect_type = hub->ports[udev->portnum - 1]->connect_type;
+
+ if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) ||
+ connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
+ udev->usb2_hw_lpm_allowed = 1;
+ usb_enable_usb2_hardware_lpm(udev);
+ }
+}
+
+static int hub_enable_device(struct usb_device *udev)
+{
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+
+ if (!hcd->driver->enable_device)
+ return 0;
+ if (udev->state == USB_STATE_ADDRESS)
+ return 0;
+ if (udev->state != USB_STATE_DEFAULT)
+ return -EINVAL;
+
+ return hcd->driver->enable_device(hcd, udev);
+}
+
+/*
+ * Get the bMaxPacketSize0 value during initialization by reading the
+ * device's device descriptor. Since we don't already know this value,
+ * the transfer is unsafe and it ignores I/O errors, only testing for
+ * reasonable received values.
+ *
+ * For "old scheme" initialization, size will be 8 so we read just the
+ * start of the device descriptor, which should work okay regardless of
+ * the actual bMaxPacketSize0 value. For "new scheme" initialization,
+ * size will be 64 (and buf will point to a sufficiently large buffer),
+ * which might not be kosher according to the USB spec but it's what
+ * Windows does and what many devices expect.
+ *
+ * Returns: bMaxPacketSize0 or a negative error code.
+ */
+static int get_bMaxPacketSize0(struct usb_device *udev,
+ struct usb_device_descriptor *buf, int size, bool first_time)
+{
+ int i, rc;
+
+ /*
+ * Retry on all errors; some devices are flakey.
+ * 255 is for WUSB devices, we actually need to use
+ * 512 (WUSB1.0[4.8.1]).
+ */
+ for (i = 0; i < GET_MAXPACKET0_TRIES; ++i) {
+ /* Start with invalid values in case the transfer fails */
+ buf->bDescriptorType = buf->bMaxPacketSize0 = 0;
+ rc = usb_control_msg(udev, usb_rcvaddr0pipe(),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
+ USB_DT_DEVICE << 8, 0,
+ buf, size,
+ initial_descriptor_timeout);
+ switch (buf->bMaxPacketSize0) {
+ case 8: case 16: case 32: case 64: case 9:
+ if (buf->bDescriptorType == USB_DT_DEVICE) {
+ rc = buf->bMaxPacketSize0;
+ break;
+ }
+ fallthrough;
+ default:
+ if (rc >= 0)
+ rc = -EPROTO;
+ break;
+ }
+
+ /*
+ * Some devices time out if they are powered on
+ * when already connected. They need a second
+ * reset, so return early. But only on the first
+ * attempt, lest we get into a time-out/reset loop.
+ */
+ if (rc > 0 || (rc == -ETIMEDOUT && first_time &&
+ udev->speed > USB_SPEED_FULL))
+ break;
+ }
+ return rc;
+}
+
+#define GET_DESCRIPTOR_BUFSIZE 64
+
+/* Reset device, (re)assign address, get device descriptor.
+ * Device connection must be stable, no more debouncing needed.
+ * Returns device in USB_STATE_ADDRESS, except on error.
+ *
+ * If this is called for an already-existing device (as part of
+ * usb_reset_and_verify_device), the caller must own the device lock and
+ * the port lock. For a newly detected device that is not accessible
+ * through any global pointers, it's not necessary to lock the device,
+ * but it is still necessary to lock the port.
+ *
+ * For a newly detected device, @dev_descr must be NULL. The device
+ * descriptor retrieved from the device will then be stored in
+ * @udev->descriptor. For an already existing device, @dev_descr
+ * must be non-NULL. The device descriptor will be stored there,
+ * not in @udev->descriptor, because descriptors for registered
+ * devices are meant to be immutable.
+ */
+static int
+hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
+ int retry_counter, struct usb_device_descriptor *dev_descr)
+{
+ struct usb_device *hdev = hub->hdev;
+ struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ int retries, operations, retval, i;
+ unsigned delay = HUB_SHORT_RESET_TIME;
+ enum usb_device_speed oldspeed = udev->speed;
+ const char *speed;
+ int devnum = udev->devnum;
+ const char *driver_name;
+ bool do_new_scheme;
+ const bool initial = !dev_descr;
+ int maxp0;
+ struct usb_device_descriptor *buf, *descr;
+
+ buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
+ if (!buf)
+ return -ENOMEM;
+
+ /* root hub ports have a slightly longer reset period
+ * (from USB 2.0 spec, section 7.1.7.5)
+ */
+ if (!hdev->parent) {
+ delay = HUB_ROOT_RESET_TIME;
+ if (port1 == hdev->bus->otg_port)
+ hdev->bus->b_hnp_enable = 0;
+ }
+
+ /* Some low speed devices have problems with the quick delay, so */
+ /* be a bit pessimistic with those devices. RHbug #23670 */
+ if (oldspeed == USB_SPEED_LOW)
+ delay = HUB_LONG_RESET_TIME;
+
+ /* Reset the device; full speed may morph to high speed */
+ /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
+ retval = hub_port_reset(hub, port1, udev, delay, false);
+ if (retval < 0) /* error or disconnect */
+ goto fail;
+ /* success, speed is known */
+
+ retval = -ENODEV;
+
+ /* Don't allow speed changes at reset, except usb 3.0 to faster */
+ if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed &&
+ !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) {
+ dev_dbg(&udev->dev, "device reset changed speed!\n");
+ goto fail;
+ }
+ oldspeed = udev->speed;
+
+ if (initial) {
+ /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
+ * it's fixed size except for full speed devices.
+ * For Wireless USB devices, ep0 max packet is always 512 (tho
+ * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
+ */
+ switch (udev->speed) {
+ case USB_SPEED_SUPER_PLUS:
+ case USB_SPEED_SUPER:
+ case USB_SPEED_WIRELESS: /* fixed at 512 */
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
+ break;
+ case USB_SPEED_HIGH: /* fixed at 64 */
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
+ break;
+ case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
+ /* to determine the ep0 maxpacket size, try to read
+ * the device descriptor to get bMaxPacketSize0 and
+ * then correct our initial guess.
+ */
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
+ break;
+ case USB_SPEED_LOW: /* fixed at 8 */
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
+ break;
+ default:
+ goto fail;
+ }
+ }
+
+ if (udev->speed == USB_SPEED_WIRELESS)
+ speed = "variable speed Wireless";
+ else
+ speed = usb_speed_string(udev->speed);
+
+ /*
+ * The controller driver may be NULL if the controller device
+ * is the middle device between platform device and roothub.
+ * This middle device may not need a device driver due to
+ * all hardware control can be at platform device driver, this
+ * platform device is usually a dual-role USB controller device.
+ */
+ if (udev->bus->controller->driver)
+ driver_name = udev->bus->controller->driver->name;
+ else
+ driver_name = udev->bus->sysdev->driver->name;
+
+ if (udev->speed < USB_SPEED_SUPER)
+ dev_info(&udev->dev,
+ "%s %s USB device number %d using %s\n",
+ (initial ? "new" : "reset"), speed,
+ devnum, driver_name);
+
+ if (initial) {
+ /* Set up TT records, if needed */
+ if (hdev->tt) {
+ udev->tt = hdev->tt;
+ udev->ttport = hdev->ttport;
+ } else if (udev->speed != USB_SPEED_HIGH
+ && hdev->speed == USB_SPEED_HIGH) {
+ if (!hub->tt.hub) {
+ dev_err(&udev->dev, "parent hub has no TT\n");
+ retval = -EINVAL;
+ goto fail;
+ }
+ udev->tt = &hub->tt;
+ udev->ttport = port1;
+ }
+ }
+
+ /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
+ * Because device hardware and firmware is sometimes buggy in
+ * this area, and this is how Linux has done it for ages.
+ * Change it cautiously.
+ *
+ * NOTE: If use_new_scheme() is true we will start by issuing
+ * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
+ * so it may help with some non-standards-compliant devices.
+ * Otherwise we start with SET_ADDRESS and then try to read the
+ * first 8 bytes of the device descriptor to get the ep0 maxpacket
+ * value.
+ */
+ do_new_scheme = use_new_scheme(udev, retry_counter, port_dev);
+
+ for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) {
+ if (do_new_scheme) {
+ retval = hub_enable_device(udev);
+ if (retval < 0) {
+ dev_err(&udev->dev,
+ "hub failed to enable device, error %d\n",
+ retval);
+ goto fail;
+ }
+
+ maxp0 = get_bMaxPacketSize0(udev, buf,
+ GET_DESCRIPTOR_BUFSIZE, retries == 0);
+ if (maxp0 > 0 && !initial &&
+ maxp0 != udev->descriptor.bMaxPacketSize0) {
+ dev_err(&udev->dev, "device reset changed ep0 maxpacket size!\n");
+ retval = -ENODEV;
+ goto fail;
+ }
+
+ retval = hub_port_reset(hub, port1, udev, delay, false);
+ if (retval < 0) /* error or disconnect */
+ goto fail;
+ if (oldspeed != udev->speed) {
+ dev_dbg(&udev->dev,
+ "device reset changed speed!\n");
+ retval = -ENODEV;
+ goto fail;
+ }
+ if (maxp0 < 0) {
+ if (maxp0 != -ENODEV)
+ dev_err(&udev->dev, "device descriptor read/64, error %d\n",
+ maxp0);
+ retval = maxp0;
+ continue;
+ }
+ }
+
+ /*
+ * If device is WUSB, we already assigned an
+ * unauthorized address in the Connect Ack sequence;
+ * authorization will assign the final address.
+ */
+ if (udev->wusb == 0) {
+ for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) {
+ retval = hub_set_address(udev, devnum);
+ if (retval >= 0)
+ break;
+ msleep(200);
+ }
+ if (retval < 0) {
+ if (retval != -ENODEV)
+ dev_err(&udev->dev, "device not accepting address %d, error %d\n",
+ devnum, retval);
+ goto fail;
+ }
+ if (udev->speed >= USB_SPEED_SUPER) {
+ devnum = udev->devnum;
+ dev_info(&udev->dev,
+ "%s SuperSpeed%s%s USB device number %d using %s\n",
+ (udev->config) ? "reset" : "new",
+ (udev->speed == USB_SPEED_SUPER_PLUS) ?
+ " Plus" : "",
+ (udev->ssp_rate == USB_SSP_GEN_2x2) ?
+ " Gen 2x2" :
+ (udev->ssp_rate == USB_SSP_GEN_2x1) ?
+ " Gen 2x1" :
+ (udev->ssp_rate == USB_SSP_GEN_1x2) ?
+ " Gen 1x2" : "",
+ devnum, driver_name);
+ }
+
+ /* cope with hardware quirkiness:
+ * - let SET_ADDRESS settle, some device hardware wants it
+ * - read ep0 maxpacket even for high and low speed,
+ */
+ msleep(10);
+ if (do_new_scheme)
+ break;
+ }
+
+ /* !do_new_scheme || wusb */
+ maxp0 = get_bMaxPacketSize0(udev, buf, 8, retries == 0);
+ if (maxp0 < 0) {
+ retval = maxp0;
+ if (retval != -ENODEV)
+ dev_err(&udev->dev,
+ "device descriptor read/8, error %d\n",
+ retval);
+ } else {
+ u32 delay;
+
+ if (!initial && maxp0 != udev->descriptor.bMaxPacketSize0) {
+ dev_err(&udev->dev, "device reset changed ep0 maxpacket size!\n");
+ retval = -ENODEV;
+ goto fail;
+ }
+
+ delay = udev->parent->hub_delay;
+ udev->hub_delay = min_t(u32, delay,
+ USB_TP_TRANSMISSION_DELAY_MAX);
+ retval = usb_set_isoch_delay(udev);
+ if (retval) {
+ dev_dbg(&udev->dev,
+ "Failed set isoch delay, error %d\n",
+ retval);
+ retval = 0;
+ }
+ break;
+ }
+ }
+ if (retval)
+ goto fail;
+
+ /*
+ * Check the ep0 maxpacket guess and correct it if necessary.
+ * maxp0 is the value stored in the device descriptor;
+ * i is the value it encodes (logarithmic for SuperSpeed or greater).
+ */
+ i = maxp0;
+ if (udev->speed >= USB_SPEED_SUPER) {
+ if (maxp0 <= 16)
+ i = 1 << maxp0;
+ else
+ i = 0; /* Invalid */
+ }
+ if (usb_endpoint_maxp(&udev->ep0.desc) == i) {
+ ; /* Initial ep0 maxpacket guess is right */
+ } else if ((udev->speed == USB_SPEED_FULL ||
+ udev->speed == USB_SPEED_HIGH) &&
+ (i == 8 || i == 16 || i == 32 || i == 64)) {
+ /* Initial guess is wrong; use the descriptor's value */
+ if (udev->speed == USB_SPEED_FULL)
+ dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
+ else
+ dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
+ usb_ep0_reinit(udev);
+ } else {
+ /* Initial guess is wrong and descriptor's value is invalid */
+ dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", maxp0);
+ retval = -EMSGSIZE;
+ goto fail;
+ }
+
+ descr = usb_get_device_descriptor(udev);
+ if (IS_ERR(descr)) {
+ retval = PTR_ERR(descr);
+ if (retval != -ENODEV)
+ dev_err(&udev->dev, "device descriptor read/all, error %d\n",
+ retval);
+ goto fail;
+ }
+ if (initial)
+ udev->descriptor = *descr;
+ else
+ *dev_descr = *descr;
+ kfree(descr);
+
+ /*
+ * Some superspeed devices have finished the link training process
+ * and attached to a superspeed hub port, but the device descriptor
+ * got from those devices show they aren't superspeed devices. Warm
+ * reset the port attached by the devices can fix them.
+ */
+ if ((udev->speed >= USB_SPEED_SUPER) &&
+ (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
+ dev_err(&udev->dev, "got a wrong device descriptor, warm reset device\n");
+ hub_port_reset(hub, port1, udev, HUB_BH_RESET_TIME, true);
+ retval = -EINVAL;
+ goto fail;
+ }
+
+ usb_detect_quirks(udev);
+
+ if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+ retval = usb_get_bos_descriptor(udev);
+ if (!retval) {
+ udev->lpm_capable = usb_device_supports_lpm(udev);
+ udev->lpm_disable_count = 1;
+ usb_set_lpm_parameters(udev);
+ usb_req_set_sel(udev);
+ }
+ }
+
+ retval = 0;
+ /* notify HCD that we have a device connected and addressed */
+ if (hcd->driver->update_device)
+ hcd->driver->update_device(hcd, udev);
+ hub_set_initial_usb2_lpm_policy(udev);
+fail:
+ if (retval) {
+ hub_port_disable(hub, port1, 0);
+ update_devnum(udev, devnum); /* for disconnect processing */
+ }
+ kfree(buf);
+ return retval;
+}
+
+static void
+check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1)
+{
+ struct usb_qualifier_descriptor *qual;
+ int status;
+
+ if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER)
+ return;
+
+ qual = kmalloc(sizeof *qual, GFP_KERNEL);
+ if (qual == NULL)
+ return;
+
+ status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0,
+ qual, sizeof *qual);
+ if (status == sizeof *qual) {
+ dev_info(&udev->dev, "not running at top speed; "
+ "connect to a high speed hub\n");
+ /* hub LEDs are probably harder to miss than syslog */
+ if (hub->has_indicators) {
+ hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
+ queue_delayed_work(system_power_efficient_wq,
+ &hub->leds, 0);
+ }
+ }
+ kfree(qual);
+}
+
+static unsigned
+hub_power_remaining(struct usb_hub *hub)
+{
+ struct usb_device *hdev = hub->hdev;
+ int remaining;
+ int port1;
+
+ if (!hub->limited_power)
+ return 0;
+
+ remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
+ for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+ unsigned unit_load;
+ int delta;
+
+ if (!udev)
+ continue;
+ if (hub_is_superspeed(udev))
+ unit_load = 150;
+ else
+ unit_load = 100;
+
+ /*
+ * Unconfigured devices may not use more than one unit load,
+ * or 8mA for OTG ports
+ */
+ if (udev->actconfig)
+ delta = usb_get_max_power(udev, udev->actconfig);
+ else if (port1 != udev->bus->otg_port || hdev->parent)
+ delta = unit_load;
+ else
+ delta = 8;
+ if (delta > hub->mA_per_port)
+ dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n",
+ delta, hub->mA_per_port);
+ remaining -= delta;
+ }
+ if (remaining < 0) {
+ dev_warn(hub->intfdev, "%dmA over power budget!\n",
+ -remaining);
+ remaining = 0;
+ }
+ return remaining;
+}
+
+
+static int descriptors_changed(struct usb_device *udev,
+ struct usb_device_descriptor *new_device_descriptor,
+ struct usb_host_bos *old_bos)
+{
+ int changed = 0;
+ unsigned index;
+ unsigned serial_len = 0;
+ unsigned len;
+ unsigned old_length;
+ int length;
+ char *buf;
+
+ if (memcmp(&udev->descriptor, new_device_descriptor,
+ sizeof(*new_device_descriptor)) != 0)
+ return 1;
+
+ if ((old_bos && !udev->bos) || (!old_bos && udev->bos))
+ return 1;
+ if (udev->bos) {
+ len = le16_to_cpu(udev->bos->desc->wTotalLength);
+ if (len != le16_to_cpu(old_bos->desc->wTotalLength))
+ return 1;
+ if (memcmp(udev->bos->desc, old_bos->desc, len))
+ return 1;
+ }
+
+ /* Since the idVendor, idProduct, and bcdDevice values in the
+ * device descriptor haven't changed, we will assume the
+ * Manufacturer and Product strings haven't changed either.
+ * But the SerialNumber string could be different (e.g., a
+ * different flash card of the same brand).
+ */
+ if (udev->serial)
+ serial_len = strlen(udev->serial) + 1;
+
+ len = serial_len;
+ for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
+ old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
+ len = max(len, old_length);
+ }
+
+ buf = kmalloc(len, GFP_NOIO);
+ if (!buf)
+ /* assume the worst */
+ return 1;
+
+ for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
+ old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
+ length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
+ old_length);
+ if (length != old_length) {
+ dev_dbg(&udev->dev, "config index %d, error %d\n",
+ index, length);
+ changed = 1;
+ break;
+ }
+ if (memcmp(buf, udev->rawdescriptors[index], old_length)
+ != 0) {
+ dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
+ index,
+ ((struct usb_config_descriptor *) buf)->
+ bConfigurationValue);
+ changed = 1;
+ break;
+ }
+ }
+
+ if (!changed && serial_len) {
+ length = usb_string(udev, udev->descriptor.iSerialNumber,
+ buf, serial_len);
+ if (length + 1 != serial_len) {
+ dev_dbg(&udev->dev, "serial string error %d\n",
+ length);
+ changed = 1;
+ } else if (memcmp(buf, udev->serial, length) != 0) {
+ dev_dbg(&udev->dev, "serial string changed\n");
+ changed = 1;
+ }
+ }
+
+ kfree(buf);
+ return changed;
+}
+
+static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
+ u16 portchange)
+{
+ int status = -ENODEV;
+ int i;
+ unsigned unit_load;
+ struct usb_device *hdev = hub->hdev;
+ struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+ static int unreliable_port = -1;
+ bool retry_locked;
+
+ /* Disconnect any existing devices under this port */
+ if (udev) {
+ if (hcd->usb_phy && !hdev->parent)
+ usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
+ usb_disconnect(&port_dev->child);
+ }
+
+ /* We can forget about a "removed" device when there's a physical
+ * disconnect or the connect status changes.
+ */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+ (portchange & USB_PORT_STAT_C_CONNECTION))
+ clear_bit(port1, hub->removed_bits);
+
+ if (portchange & (USB_PORT_STAT_C_CONNECTION |
+ USB_PORT_STAT_C_ENABLE)) {
+ status = hub_port_debounce_be_stable(hub, port1);
+ if (status < 0) {
+ if (status != -ENODEV &&
+ port1 != unreliable_port &&
+ printk_ratelimit())
+ dev_err(&port_dev->dev, "connect-debounce failed\n");
+ portstatus &= ~USB_PORT_STAT_CONNECTION;
+ unreliable_port = port1;
+ } else {
+ portstatus = status;
+ }
+ }
+
+ /* Return now if debouncing failed or nothing is connected or
+ * the device was "removed".
+ */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
+ test_bit(port1, hub->removed_bits)) {
+
+ /*
+ * maybe switch power back on (e.g. root hub was reset)
+ * but only if the port isn't owned by someone else.
+ */
+ if (hub_is_port_power_switchable(hub)
+ && !usb_port_is_power_on(hub, portstatus)
+ && !port_dev->port_owner)
+ set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
+
+ if (portstatus & USB_PORT_STAT_ENABLE)
+ goto done;
+ return;
+ }
+ if (hub_is_superspeed(hub->hdev))
+ unit_load = 150;
+ else
+ unit_load = 100;
+
+ status = 0;
+
+ for (i = 0; i < PORT_INIT_TRIES; i++) {
+ usb_lock_port(port_dev);
+ mutex_lock(hcd->address0_mutex);
+ retry_locked = true;
+ /* reallocate for each attempt, since references
+ * to the previous one can escape in various ways
+ */
+ udev = usb_alloc_dev(hdev, hdev->bus, port1);
+ if (!udev) {
+ dev_err(&port_dev->dev,
+ "couldn't allocate usb_device\n");
+ mutex_unlock(hcd->address0_mutex);
+ usb_unlock_port(port_dev);
+ goto done;
+ }
+
+ usb_set_device_state(udev, USB_STATE_POWERED);
+ udev->bus_mA = hub->mA_per_port;
+ udev->level = hdev->level + 1;
+ udev->wusb = hub_is_wusb(hub);
+
+ /* Devices connected to SuperSpeed hubs are USB 3.0 or later */
+ if (hub_is_superspeed(hub->hdev))
+ udev->speed = USB_SPEED_SUPER;
+ else
+ udev->speed = USB_SPEED_UNKNOWN;
+
+ choose_devnum(udev);
+ if (udev->devnum <= 0) {
+ status = -ENOTCONN; /* Don't retry */
+ goto loop;
+ }
+
+ /* reset (non-USB 3.0 devices) and get descriptor */
+ status = hub_port_init(hub, udev, port1, i, NULL);
+ if (status < 0)
+ goto loop;
+
+ mutex_unlock(hcd->address0_mutex);
+ usb_unlock_port(port_dev);
+ retry_locked = false;
+
+ if (udev->quirks & USB_QUIRK_DELAY_INIT)
+ msleep(2000);
+
+ /* consecutive bus-powered hubs aren't reliable; they can
+ * violate the voltage drop budget. if the new child has
+ * a "powered" LED, users should notice we didn't enable it
+ * (without reading syslog), even without per-port LEDs
+ * on the parent.
+ */
+ if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
+ && udev->bus_mA <= unit_load) {
+ u16 devstat;
+
+ status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0,
+ &devstat);
+ if (status) {
+ dev_dbg(&udev->dev, "get status %d ?\n", status);
+ goto loop_disable;
+ }
+ if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
+ dev_err(&udev->dev,
+ "can't connect bus-powered hub "
+ "to this port\n");
+ if (hub->has_indicators) {
+ hub->indicator[port1-1] =
+ INDICATOR_AMBER_BLINK;
+ queue_delayed_work(
+ system_power_efficient_wq,
+ &hub->leds, 0);
+ }
+ status = -ENOTCONN; /* Don't retry */
+ goto loop_disable;
+ }
+ }
+
+ /* check for devices running slower than they could */
+ if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
+ && udev->speed == USB_SPEED_FULL
+ && highspeed_hubs != 0)
+ check_highspeed(hub, udev, port1);
+
+ /* Store the parent's children[] pointer. At this point
+ * udev becomes globally accessible, although presumably
+ * no one will look at it until hdev is unlocked.
+ */
+ status = 0;
+
+ mutex_lock(&usb_port_peer_mutex);
+
+ /* We mustn't add new devices if the parent hub has
+ * been disconnected; we would race with the
+ * recursively_mark_NOTATTACHED() routine.
+ */
+ spin_lock_irq(&device_state_lock);
+ if (hdev->state == USB_STATE_NOTATTACHED)
+ status = -ENOTCONN;
+ else
+ port_dev->child = udev;
+ spin_unlock_irq(&device_state_lock);
+ mutex_unlock(&usb_port_peer_mutex);
+
+ /* Run it through the hoops (find a driver, etc) */
+ if (!status) {
+ status = usb_new_device(udev);
+ if (status) {
+ mutex_lock(&usb_port_peer_mutex);
+ spin_lock_irq(&device_state_lock);
+ port_dev->child = NULL;
+ spin_unlock_irq(&device_state_lock);
+ mutex_unlock(&usb_port_peer_mutex);
+ } else {
+ if (hcd->usb_phy && !hdev->parent)
+ usb_phy_notify_connect(hcd->usb_phy,
+ udev->speed);
+ }
+ }
+
+ if (status)
+ goto loop_disable;
+
+ status = hub_power_remaining(hub);
+ if (status)
+ dev_dbg(hub->intfdev, "%dmA power budget left\n", status);
+
+ return;
+
+loop_disable:
+ hub_port_disable(hub, port1, 1);
+loop:
+ usb_ep0_reinit(udev);
+ release_devnum(udev);
+ hub_free_dev(udev);
+ if (retry_locked) {
+ mutex_unlock(hcd->address0_mutex);
+ usb_unlock_port(port_dev);
+ }
+ usb_put_dev(udev);
+ if ((status == -ENOTCONN) || (status == -ENOTSUPP))
+ break;
+
+ /* When halfway through our retry count, power-cycle the port */
+ if (i == (PORT_INIT_TRIES - 1) / 2) {
+ dev_info(&port_dev->dev, "attempt power cycle\n");
+ usb_hub_set_port_power(hdev, hub, port1, false);
+ msleep(2 * hub_power_on_good_delay(hub));
+ usb_hub_set_port_power(hdev, hub, port1, true);
+ msleep(hub_power_on_good_delay(hub));
+ }
+ }
+ if (hub->hdev->parent ||
+ !hcd->driver->port_handed_over ||
+ !(hcd->driver->port_handed_over)(hcd, port1)) {
+ if (status != -ENOTCONN && status != -ENODEV)
+ dev_err(&port_dev->dev,
+ "unable to enumerate USB device\n");
+ }
+
+done:
+ hub_port_disable(hub, port1, 1);
+ if (hcd->driver->relinquish_port && !hub->hdev->parent) {
+ if (status != -ENOTCONN && status != -ENODEV)
+ hcd->driver->relinquish_port(hcd, port1);
+ }
+}
+
+/* Handle physical or logical connection change events.
+ * This routine is called when:
+ * a port connection-change occurs;
+ * a port enable-change occurs (often caused by EMI);
+ * usb_reset_and_verify_device() encounters changed descriptors (as from
+ * a firmware download)
+ * caller already locked the hub
+ */
+static void hub_port_connect_change(struct usb_hub *hub, int port1,
+ u16 portstatus, u16 portchange)
+ __must_hold(&port_dev->status_lock)
+{
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+ struct usb_device_descriptor *descr;
+ int status = -ENODEV;
+
+ dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus,
+ portchange, portspeed(hub, portstatus));
+
+ if (hub->has_indicators) {
+ set_port_led(hub, port1, HUB_LED_AUTO);
+ hub->indicator[port1-1] = INDICATOR_AUTO;
+ }
+
+#ifdef CONFIG_USB_OTG
+ /* during HNP, don't repeat the debounce */
+ if (hub->hdev->bus->is_b_host)
+ portchange &= ~(USB_PORT_STAT_C_CONNECTION |
+ USB_PORT_STAT_C_ENABLE);
+#endif
+
+ /* Try to resuscitate an existing device */
+ if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
+ udev->state != USB_STATE_NOTATTACHED) {
+ if (portstatus & USB_PORT_STAT_ENABLE) {
+ /*
+ * USB-3 connections are initialized automatically by
+ * the hostcontroller hardware. Therefore check for
+ * changed device descriptors before resuscitating the
+ * device.
+ */
+ descr = usb_get_device_descriptor(udev);
+ if (IS_ERR(descr)) {
+ dev_dbg(&udev->dev,
+ "can't read device descriptor %ld\n",
+ PTR_ERR(descr));
+ } else {
+ if (descriptors_changed(udev, descr,
+ udev->bos)) {
+ dev_dbg(&udev->dev,
+ "device descriptor has changed\n");
+ } else {
+ status = 0; /* Nothing to do */
+ }
+ kfree(descr);
+ }
+#ifdef CONFIG_PM
+ } else if (udev->state == USB_STATE_SUSPENDED &&
+ udev->persist_enabled) {
+ /* For a suspended device, treat this as a
+ * remote wakeup event.
+ */
+ usb_unlock_port(port_dev);
+ status = usb_remote_wakeup(udev);
+ usb_lock_port(port_dev);
+#endif
+ } else {
+ /* Don't resuscitate */;
+ }
+ }
+ clear_bit(port1, hub->change_bits);
+
+ /* successfully revalidated the connection */
+ if (status == 0)
+ return;
+
+ usb_unlock_port(port_dev);
+ hub_port_connect(hub, port1, portstatus, portchange);
+ usb_lock_port(port_dev);
+}
+
+/* Handle notifying userspace about hub over-current events */
+static void port_over_current_notify(struct usb_port *port_dev)
+{
+ char *envp[3] = { NULL, NULL, NULL };
+ struct device *hub_dev;
+ char *port_dev_path;
+
+ sysfs_notify(&port_dev->dev.kobj, NULL, "over_current_count");
+
+ hub_dev = port_dev->dev.parent;
+
+ if (!hub_dev)
+ return;
+
+ port_dev_path = kobject_get_path(&port_dev->dev.kobj, GFP_KERNEL);
+ if (!port_dev_path)
+ return;
+
+ envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path);
+ if (!envp[0])
+ goto exit;
+
+ envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u",
+ port_dev->over_current_count);
+ if (!envp[1])
+ goto exit;
+
+ kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp);
+
+exit:
+ kfree(envp[1]);
+ kfree(envp[0]);
+ kfree(port_dev_path);
+}
+
+static void port_event(struct usb_hub *hub, int port1)
+ __must_hold(&port_dev->status_lock)
+{
+ int connect_change;
+ struct usb_port *port_dev = hub->ports[port1 - 1];
+ struct usb_device *udev = port_dev->child;
+ struct usb_device *hdev = hub->hdev;
+ u16 portstatus, portchange;
+ int i = 0;
+
+ connect_change = test_bit(port1, hub->change_bits);
+ clear_bit(port1, hub->event_bits);
+ clear_bit(port1, hub->wakeup_bits);
+
+ if (usb_hub_port_status(hub, port1, &portstatus, &portchange) < 0)
+ return;
+
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
+ connect_change = 1;
+ }
+
+ if (portchange & USB_PORT_STAT_C_ENABLE) {
+ if (!connect_change)
+ dev_dbg(&port_dev->dev, "enable change, status %08x\n",
+ portstatus);
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
+
+ /*
+ * EM interference sometimes causes badly shielded USB devices
+ * to be shutdown by the hub, this hack enables them again.
+ * Works at least with mouse driver.
+ */
+ if (!(portstatus & USB_PORT_STAT_ENABLE)
+ && !connect_change && udev) {
+ dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n");
+ connect_change = 1;
+ }
+ }
+
+ if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
+ u16 status = 0, unused;
+ port_dev->over_current_count++;
+ port_over_current_notify(port_dev);
+
+ dev_dbg(&port_dev->dev, "over-current change #%u\n",
+ port_dev->over_current_count);
+ usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_C_OVER_CURRENT);
+ msleep(100); /* Cool down */
+ hub_power_on(hub, true);
+ usb_hub_port_status(hub, port1, &status, &unused);
+ if (status & USB_PORT_STAT_OVERCURRENT)
+ dev_err(&port_dev->dev, "over-current condition\n");
+ }
+
+ if (portchange & USB_PORT_STAT_C_RESET) {
+ dev_dbg(&port_dev->dev, "reset change\n");
+ usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET);
+ }
+ if ((portchange & USB_PORT_STAT_C_BH_RESET)
+ && hub_is_superspeed(hdev)) {
+ dev_dbg(&port_dev->dev, "warm reset change\n");
+ usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_C_BH_PORT_RESET);
+ }
+ if (portchange & USB_PORT_STAT_C_LINK_STATE) {
+ dev_dbg(&port_dev->dev, "link state change\n");
+ usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_C_PORT_LINK_STATE);
+ }
+ if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
+ dev_warn(&port_dev->dev, "config error\n");
+ usb_clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
+ }
+
+ /* skip port actions that require the port to be powered on */
+ if (!pm_runtime_active(&port_dev->dev))
+ return;
+
+ if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange))
+ connect_change = 1;
+
+ /*
+ * Avoid trying to recover a USB3 SS.Inactive port with a warm reset if
+ * the device was disconnected. A 12ms disconnect detect timer in
+ * SS.Inactive state transitions the port to RxDetect automatically.
+ * SS.Inactive link error state is common during device disconnect.
+ */
+ while (hub_port_warm_reset_required(hub, port1, portstatus)) {
+ if ((i++ < DETECT_DISCONNECT_TRIES) && udev) {
+ u16 unused;
+
+ msleep(20);
+ usb_hub_port_status(hub, port1, &portstatus, &unused);
+ dev_dbg(&port_dev->dev, "Wait for inactive link disconnect detect\n");
+ continue;
+ } else if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION)
+ || udev->state == USB_STATE_NOTATTACHED) {
+ dev_dbg(&port_dev->dev, "do warm reset, port only\n");
+ if (hub_port_reset(hub, port1, NULL,
+ HUB_BH_RESET_TIME, true) < 0)
+ hub_port_disable(hub, port1, 1);
+ } else {
+ dev_dbg(&port_dev->dev, "do warm reset, full device\n");
+ usb_unlock_port(port_dev);
+ usb_lock_device(udev);
+ usb_reset_device(udev);
+ usb_unlock_device(udev);
+ usb_lock_port(port_dev);
+ connect_change = 0;
+ }
+ break;
+ }
+
+ if (connect_change)
+ hub_port_connect_change(hub, port1, portstatus, portchange);
+}
+
+static void hub_event(struct work_struct *work)
+{
+ struct usb_device *hdev;
+ struct usb_interface *intf;
+ struct usb_hub *hub;
+ struct device *hub_dev;
+ u16 hubstatus;
+ u16 hubchange;
+ int i, ret;
+
+ hub = container_of(work, struct usb_hub, events);
+ hdev = hub->hdev;
+ hub_dev = hub->intfdev;
+ intf = to_usb_interface(hub_dev);
+
+ kcov_remote_start_usb((u64)hdev->bus->busnum);
+
+ dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
+ hdev->state, hdev->maxchild,
+ /* NOTE: expects max 15 ports... */
+ (u16) hub->change_bits[0],
+ (u16) hub->event_bits[0]);
+
+ /* Lock the device, then check to see if we were
+ * disconnected while waiting for the lock to succeed. */
+ usb_lock_device(hdev);
+ if (unlikely(hub->disconnected))
+ goto out_hdev_lock;
+
+ /* If the hub has died, clean up after it */
+ if (hdev->state == USB_STATE_NOTATTACHED) {
+ hub->error = -ENODEV;
+ hub_quiesce(hub, HUB_DISCONNECT);
+ goto out_hdev_lock;
+ }
+
+ /* Autoresume */
+ ret = usb_autopm_get_interface(intf);
+ if (ret) {
+ dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
+ goto out_hdev_lock;
+ }
+
+ /* If this is an inactive hub, do nothing */
+ if (hub->quiescing)
+ goto out_autopm;
+
+ if (hub->error) {
+ dev_dbg(hub_dev, "resetting for error %d\n", hub->error);
+
+ ret = usb_reset_device(hdev);
+ if (ret) {
+ dev_dbg(hub_dev, "error resetting hub: %d\n", ret);
+ goto out_autopm;
+ }
+
+ hub->nerrors = 0;
+ hub->error = 0;
+ }
+
+ /* deal with port status changes */
+ for (i = 1; i <= hdev->maxchild; i++) {
+ struct usb_port *port_dev = hub->ports[i - 1];
+
+ if (test_bit(i, hub->event_bits)
+ || test_bit(i, hub->change_bits)
+ || test_bit(i, hub->wakeup_bits)) {
+ /*
+ * The get_noresume and barrier ensure that if
+ * the port was in the process of resuming, we
+ * flush that work and keep the port active for
+ * the duration of the port_event(). However,
+ * if the port is runtime pm suspended
+ * (powered-off), we leave it in that state, run
+ * an abbreviated port_event(), and move on.
+ */
+ pm_runtime_get_noresume(&port_dev->dev);
+ pm_runtime_barrier(&port_dev->dev);
+ usb_lock_port(port_dev);
+ port_event(hub, i);
+ usb_unlock_port(port_dev);
+ pm_runtime_put_sync(&port_dev->dev);
+ }
+ }
+
+ /* deal with hub status changes */
+ if (test_and_clear_bit(0, hub->event_bits) == 0)
+ ; /* do nothing */
+ else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
+ dev_err(hub_dev, "get_hub_status failed\n");
+ else {
+ if (hubchange & HUB_CHANGE_LOCAL_POWER) {
+ dev_dbg(hub_dev, "power change\n");
+ clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
+ if (hubstatus & HUB_STATUS_LOCAL_POWER)
+ /* FIXME: Is this always true? */
+ hub->limited_power = 1;
+ else
+ hub->limited_power = 0;
+ }
+ if (hubchange & HUB_CHANGE_OVERCURRENT) {
+ u16 status = 0;
+ u16 unused;
+
+ dev_dbg(hub_dev, "over-current change\n");
+ clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
+ msleep(500); /* Cool down */
+ hub_power_on(hub, true);
+ hub_hub_status(hub, &status, &unused);
+ if (status & HUB_STATUS_OVERCURRENT)
+ dev_err(hub_dev, "over-current condition\n");
+ }
+ }
+
+out_autopm:
+ /* Balance the usb_autopm_get_interface() above */
+ usb_autopm_put_interface_no_suspend(intf);
+out_hdev_lock:
+ usb_unlock_device(hdev);
+
+ /* Balance the stuff in kick_hub_wq() and allow autosuspend */
+ usb_autopm_put_interface(intf);
+ kref_put(&hub->kref, hub_release);
+
+ kcov_remote_stop();
+}
+
+static const struct usb_device_id hub_id_table[] = {
+ { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+ | USB_DEVICE_ID_MATCH_PRODUCT
+ | USB_DEVICE_ID_MATCH_INT_CLASS,
+ .idVendor = USB_VENDOR_SMSC,
+ .idProduct = USB_PRODUCT_USB5534B,
+ .bInterfaceClass = USB_CLASS_HUB,
+ .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+ { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+ | USB_DEVICE_ID_MATCH_PRODUCT,
+ .idVendor = USB_VENDOR_CYPRESS,
+ .idProduct = USB_PRODUCT_CY7C65632,
+ .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+ { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+ | USB_DEVICE_ID_MATCH_INT_CLASS,
+ .idVendor = USB_VENDOR_GENESYS_LOGIC,
+ .bInterfaceClass = USB_CLASS_HUB,
+ .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
+ { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+ | USB_DEVICE_ID_MATCH_PRODUCT,
+ .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+ .idProduct = USB_PRODUCT_TUSB8041_USB2,
+ .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+ { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+ | USB_DEVICE_ID_MATCH_PRODUCT,
+ .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+ .idProduct = USB_PRODUCT_TUSB8041_USB3,
+ .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+ { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
+ .bDeviceClass = USB_CLASS_HUB},
+ { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
+ .bInterfaceClass = USB_CLASS_HUB},
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, hub_id_table);
+
+static struct usb_driver hub_driver = {
+ .name = "hub",
+ .probe = hub_probe,
+ .disconnect = hub_disconnect,
+ .suspend = hub_suspend,
+ .resume = hub_resume,
+ .reset_resume = hub_reset_resume,
+ .pre_reset = hub_pre_reset,
+ .post_reset = hub_post_reset,
+ .unlocked_ioctl = hub_ioctl,
+ .id_table = hub_id_table,
+ .supports_autosuspend = 1,
+};
+
+int usb_hub_init(void)
+{
+ if (usb_register(&hub_driver) < 0) {
+ printk(KERN_ERR "%s: can't register hub driver\n",
+ usbcore_name);
+ return -1;
+ }
+
+ /*
+ * The workqueue needs to be freezable to avoid interfering with
+ * USB-PERSIST port handover. Otherwise it might see that a full-speed
+ * device was gone before the EHCI controller had handed its port
+ * over to the companion full-speed controller.
+ */
+ hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0);
+ if (hub_wq)
+ return 0;
+
+ /* Fall through if kernel_thread failed */
+ usb_deregister(&hub_driver);
+ pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name);
+
+ return -1;
+}
+
+void usb_hub_cleanup(void)
+{
+ destroy_workqueue(hub_wq);
+
+ /*
+ * Hub resources are freed for us by usb_deregister. It calls
+ * usb_driver_purge on every device which in turn calls that
+ * devices disconnect function if it is using this driver.
+ * The hub_disconnect function takes care of releasing the
+ * individual hub resources. -greg
+ */
+ usb_deregister(&hub_driver);
+} /* usb_hub_cleanup() */
+
+/**
+ * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
+ * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
+ *
+ * WARNING - don't use this routine to reset a composite device
+ * (one with multiple interfaces owned by separate drivers)!
+ * Use usb_reset_device() instead.
+ *
+ * Do a port reset, reassign the device's address, and establish its
+ * former operating configuration. If the reset fails, or the device's
+ * descriptors change from their values before the reset, or the original
+ * configuration and altsettings cannot be restored, a flag will be set
+ * telling hub_wq to pretend the device has been disconnected and then
+ * re-connected. All drivers will be unbound, and the device will be
+ * re-enumerated and probed all over again.
+ *
+ * Return: 0 if the reset succeeded, -ENODEV if the device has been
+ * flagged for logical disconnection, or some other negative error code
+ * if the reset wasn't even attempted.
+ *
+ * Note:
+ * The caller must own the device lock and the port lock, the latter is
+ * taken by usb_reset_device(). For example, it's safe to use
+ * usb_reset_device() from a driver probe() routine after downloading
+ * new firmware. For calls that might not occur during probe(), drivers
+ * should lock the device using usb_lock_device_for_reset().
+ *
+ * Locking exception: This routine may also be called from within an
+ * autoresume handler. Such usage won't conflict with other tasks
+ * holding the device lock because these tasks should always call
+ * usb_autopm_resume_device(), thereby preventing any unwanted
+ * autoresume. The autoresume handler is expected to have already
+ * acquired the port lock before calling this routine.
+ */
+static int usb_reset_and_verify_device(struct usb_device *udev)
+{
+ struct usb_device *parent_hdev = udev->parent;
+ struct usb_hub *parent_hub;
+ struct usb_hcd *hcd = bus_to_hcd(udev->bus);
+ struct usb_device_descriptor descriptor;
+ struct usb_host_bos *bos;
+ int i, j, ret = 0;
+ int port1 = udev->portnum;
+
+ if (udev->state == USB_STATE_NOTATTACHED ||
+ udev->state == USB_STATE_SUSPENDED) {
+ dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
+ udev->state);
+ return -EINVAL;
+ }
+
+ if (!parent_hdev)
+ return -EISDIR;
+
+ parent_hub = usb_hub_to_struct_hub(parent_hdev);
+
+ /* Disable USB2 hardware LPM.
+ * It will be re-enabled by the enumeration process.
+ */
+ usb_disable_usb2_hardware_lpm(udev);
+
+ bos = udev->bos;
+ udev->bos = NULL;
+
+ mutex_lock(hcd->address0_mutex);
+
+ for (i = 0; i < PORT_INIT_TRIES; ++i) {
+
+ /* ep0 maxpacket size may change; let the HCD know about it.
+ * Other endpoints will be handled by re-enumeration. */
+ usb_ep0_reinit(udev);
+ ret = hub_port_init(parent_hub, udev, port1, i, &descriptor);
+ if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
+ break;
+ }
+ mutex_unlock(hcd->address0_mutex);
+
+ if (ret < 0)
+ goto re_enumerate;
+
+ /* Device might have changed firmware (DFU or similar) */
+ if (descriptors_changed(udev, &descriptor, bos)) {
+ dev_info(&udev->dev, "device firmware changed\n");
+ goto re_enumerate;
+ }
+
+ /* Restore the device's previous configuration */
+ if (!udev->actconfig)
+ goto done;
+
+ mutex_lock(hcd->bandwidth_mutex);
+ ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
+ if (ret < 0) {
+ dev_warn(&udev->dev,
+ "Busted HC? Not enough HCD resources for "
+ "old configuration.\n");
+ mutex_unlock(hcd->bandwidth_mutex);
+ goto re_enumerate;
+ }
+ ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
+ USB_REQ_SET_CONFIGURATION, 0,
+ udev->actconfig->desc.bConfigurationValue, 0,
+ NULL, 0, USB_CTRL_SET_TIMEOUT);
+ if (ret < 0) {
+ dev_err(&udev->dev,
+ "can't restore configuration #%d (error=%d)\n",
+ udev->actconfig->desc.bConfigurationValue, ret);
+ mutex_unlock(hcd->bandwidth_mutex);
+ goto re_enumerate;
+ }
+ mutex_unlock(hcd->bandwidth_mutex);
+ usb_set_device_state(udev, USB_STATE_CONFIGURED);
+
+ /* Put interfaces back into the same altsettings as before.
+ * Don't bother to send the Set-Interface request for interfaces
+ * that were already in altsetting 0; besides being unnecessary,
+ * many devices can't handle it. Instead just reset the host-side
+ * endpoint state.
+ */
+ for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+ struct usb_host_config *config = udev->actconfig;
+ struct usb_interface *intf = config->interface[i];
+ struct usb_interface_descriptor *desc;
+
+ desc = &intf->cur_altsetting->desc;
+ if (desc->bAlternateSetting == 0) {
+ usb_disable_interface(udev, intf, true);
+ usb_enable_interface(udev, intf, true);
+ ret = 0;
+ } else {
+ /* Let the bandwidth allocation function know that this
+ * device has been reset, and it will have to use
+ * alternate setting 0 as the current alternate setting.
+ */
+ intf->resetting_device = 1;
+ ret = usb_set_interface(udev, desc->bInterfaceNumber,
+ desc->bAlternateSetting);
+ intf->resetting_device = 0;
+ }
+ if (ret < 0) {
+ dev_err(&udev->dev, "failed to restore interface %d "
+ "altsetting %d (error=%d)\n",
+ desc->bInterfaceNumber,
+ desc->bAlternateSetting,
+ ret);
+ goto re_enumerate;
+ }
+ /* Resetting also frees any allocated streams */
+ for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++)
+ intf->cur_altsetting->endpoint[j].streams = 0;
+ }
+
+done:
+ /* Now that the alt settings are re-installed, enable LTM and LPM. */
+ usb_enable_usb2_hardware_lpm(udev);
+ usb_unlocked_enable_lpm(udev);
+ usb_enable_ltm(udev);
+ usb_release_bos_descriptor(udev);
+ udev->bos = bos;
+ return 0;
+
+re_enumerate:
+ usb_release_bos_descriptor(udev);
+ udev->bos = bos;
+ hub_port_logical_disconnect(parent_hub, port1);
+ return -ENODEV;
+}
+
+/**
+ * usb_reset_device - warn interface drivers and perform a USB port reset
+ * @udev: device to reset (not in NOTATTACHED state)
+ *
+ * Warns all drivers bound to registered interfaces (using their pre_reset
+ * method), performs the port reset, and then lets the drivers know that
+ * the reset is over (using their post_reset method).
+ *
+ * Return: The same as for usb_reset_and_verify_device().
+ * However, if a reset is already in progress (for instance, if a
+ * driver doesn't have pre_reset() or post_reset() callbacks, and while
+ * being unbound or re-bound during the ongoing reset its disconnect()
+ * or probe() routine tries to perform a second, nested reset), the
+ * routine returns -EINPROGRESS.
+ *
+ * Note:
+ * The caller must own the device lock. For example, it's safe to use
+ * this from a driver probe() routine after downloading new firmware.
+ * For calls that might not occur during probe(), drivers should lock
+ * the device using usb_lock_device_for_reset().
+ *
+ * If an interface is currently being probed or disconnected, we assume
+ * its driver knows how to handle resets. For all other interfaces,
+ * if the driver doesn't have pre_reset and post_reset methods then
+ * we attempt to unbind it and rebind afterward.
+ */
+int usb_reset_device(struct usb_device *udev)
+{
+ int ret;
+ int i;
+ unsigned int noio_flag;
+ struct usb_port *port_dev;
+ struct usb_host_config *config = udev->actconfig;
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+
+ if (udev->state == USB_STATE_NOTATTACHED) {
+ dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
+ udev->state);
+ return -EINVAL;
+ }
+
+ if (!udev->parent) {
+ /* this requires hcd-specific logic; see ohci_restart() */
+ dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
+ return -EISDIR;
+ }
+
+ if (udev->reset_in_progress)
+ return -EINPROGRESS;
+ udev->reset_in_progress = 1;
+
+ port_dev = hub->ports[udev->portnum - 1];
+
+ /*
+ * Don't allocate memory with GFP_KERNEL in current
+ * context to avoid possible deadlock if usb mass
+ * storage interface or usbnet interface(iSCSI case)
+ * is included in current configuration. The easist
+ * approach is to do it for every device reset,
+ * because the device 'memalloc_noio' flag may have
+ * not been set before reseting the usb device.
+ */
+ noio_flag = memalloc_noio_save();
+
+ /* Prevent autosuspend during the reset */
+ usb_autoresume_device(udev);
+
+ if (config) {
+ for (i = 0; i < config->desc.bNumInterfaces; ++i) {
+ struct usb_interface *cintf = config->interface[i];
+ struct usb_driver *drv;
+ int unbind = 0;
+
+ if (cintf->dev.driver) {
+ drv = to_usb_driver(cintf->dev.driver);
+ if (drv->pre_reset && drv->post_reset)
+ unbind = (drv->pre_reset)(cintf);
+ else if (cintf->condition ==
+ USB_INTERFACE_BOUND)
+ unbind = 1;
+ if (unbind)
+ usb_forced_unbind_intf(cintf);
+ }
+ }
+ }
+
+ usb_lock_port(port_dev);
+ ret = usb_reset_and_verify_device(udev);
+ usb_unlock_port(port_dev);
+
+ if (config) {
+ for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
+ struct usb_interface *cintf = config->interface[i];
+ struct usb_driver *drv;
+ int rebind = cintf->needs_binding;
+
+ if (!rebind && cintf->dev.driver) {
+ drv = to_usb_driver(cintf->dev.driver);
+ if (drv->post_reset)
+ rebind = (drv->post_reset)(cintf);
+ else if (cintf->condition ==
+ USB_INTERFACE_BOUND)
+ rebind = 1;
+ if (rebind)
+ cintf->needs_binding = 1;
+ }
+ }
+
+ /* If the reset failed, hub_wq will unbind drivers later */
+ if (ret == 0)
+ usb_unbind_and_rebind_marked_interfaces(udev);
+ }
+
+ usb_autosuspend_device(udev);
+ memalloc_noio_restore(noio_flag);
+ udev->reset_in_progress = 0;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_reset_device);
+
+
+/**
+ * usb_queue_reset_device - Reset a USB device from an atomic context
+ * @iface: USB interface belonging to the device to reset
+ *
+ * This function can be used to reset a USB device from an atomic
+ * context, where usb_reset_device() won't work (as it blocks).
+ *
+ * Doing a reset via this method is functionally equivalent to calling
+ * usb_reset_device(), except for the fact that it is delayed to a
+ * workqueue. This means that any drivers bound to other interfaces
+ * might be unbound, as well as users from usbfs in user space.
+ *
+ * Corner cases:
+ *
+ * - Scheduling two resets at the same time from two different drivers
+ * attached to two different interfaces of the same device is
+ * possible; depending on how the driver attached to each interface
+ * handles ->pre_reset(), the second reset might happen or not.
+ *
+ * - If the reset is delayed so long that the interface is unbound from
+ * its driver, the reset will be skipped.
+ *
+ * - This function can be called during .probe(). It can also be called
+ * during .disconnect(), but doing so is pointless because the reset
+ * will not occur. If you really want to reset the device during
+ * .disconnect(), call usb_reset_device() directly -- but watch out
+ * for nested unbinding issues!
+ */
+void usb_queue_reset_device(struct usb_interface *iface)
+{
+ if (schedule_work(&iface->reset_ws))
+ usb_get_intf(iface);
+}
+EXPORT_SYMBOL_GPL(usb_queue_reset_device);
+
+/**
+ * usb_hub_find_child - Get the pointer of child device
+ * attached to the port which is specified by @port1.
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num to indicate which port the child device
+ * is attached to.
+ *
+ * USB drivers call this function to get hub's child device
+ * pointer.
+ *
+ * Return: %NULL if input param is invalid and
+ * child's usb_device pointer if non-NULL.
+ */
+struct usb_device *usb_hub_find_child(struct usb_device *hdev,
+ int port1)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+
+ if (port1 < 1 || port1 > hdev->maxchild)
+ return NULL;
+ return hub->ports[port1 - 1]->child;
+}
+EXPORT_SYMBOL_GPL(usb_hub_find_child);
+
+void usb_hub_adjust_deviceremovable(struct usb_device *hdev,
+ struct usb_hub_descriptor *desc)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+ enum usb_port_connect_type connect_type;
+ int i;
+
+ if (!hub)
+ return;
+
+ if (!hub_is_superspeed(hdev)) {
+ for (i = 1; i <= hdev->maxchild; i++) {
+ struct usb_port *port_dev = hub->ports[i - 1];
+
+ connect_type = port_dev->connect_type;
+ if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
+ u8 mask = 1 << (i%8);
+
+ if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) {
+ dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
+ desc->u.hs.DeviceRemovable[i/8] |= mask;
+ }
+ }
+ }
+ } else {
+ u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable);
+
+ for (i = 1; i <= hdev->maxchild; i++) {
+ struct usb_port *port_dev = hub->ports[i - 1];
+
+ connect_type = port_dev->connect_type;
+ if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
+ u16 mask = 1 << i;
+
+ if (!(port_removable & mask)) {
+ dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
+ port_removable |= mask;
+ }
+ }
+ }
+
+ desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
+ }
+}
+
+#ifdef CONFIG_ACPI
+/**
+ * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num of the port
+ *
+ * Return: Port's acpi handle if successful, %NULL if params are
+ * invalid.
+ */
+acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
+ int port1)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
+
+ if (!hub)
+ return NULL;
+
+ return ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
+}
+#endif