diff options
Diffstat (limited to 'drivers/usb/storage/usb.c')
| -rw-r--r-- | drivers/usb/storage/usb.c | 1159 |
1 files changed, 1159 insertions, 0 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c new file mode 100644 index 000000000..2349dfa3b --- /dev/null +++ b/drivers/usb/storage/usb.c @@ -0,0 +1,1159 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for USB Mass Storage compliant devices + * + * Current development and maintenance by: + * (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net) + * + * Developed with the assistance of: + * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) + * (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu) + * + * Initial work by: + * (c) 1999 Michael Gee (michael@linuxspecific.com) + * + * usb_device_id support by Adam J. Richter (adam@yggdrasil.com): + * (c) 2000 Yggdrasil Computing, Inc. + * + * This driver is based on the 'USB Mass Storage Class' document. This + * describes in detail the protocol used to communicate with such + * devices. Clearly, the designers had SCSI and ATAPI commands in + * mind when they created this document. The commands are all very + * similar to commands in the SCSI-II and ATAPI specifications. + * + * It is important to note that in a number of cases this class + * exhibits class-specific exemptions from the USB specification. + * Notably the usage of NAK, STALL and ACK differs from the norm, in + * that they are used to communicate wait, failed and OK on commands. + * + * Also, for certain devices, the interrupt endpoint is used to convey + * status of a command. + */ + +#ifdef CONFIG_USB_STORAGE_DEBUG +#define DEBUG +#endif + +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/kthread.h> +#include <linux/mutex.h> +#include <linux/utsname.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> + +#include "usb.h" +#include "scsiglue.h" +#include "transport.h" +#include "protocol.h" +#include "debug.h" +#include "initializers.h" + +#include "sierra_ms.h" +#include "option_ms.h" + +#if IS_ENABLED(CONFIG_USB_UAS) +#include "uas-detect.h" +#endif + +#define DRV_NAME "usb-storage" + +/* Some informational data */ +MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>"); +MODULE_DESCRIPTION("USB Mass Storage driver for Linux"); +MODULE_LICENSE("GPL"); + +static unsigned int delay_use = 1; +module_param(delay_use, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device"); + +static char quirks[128]; +module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks"); + + +/* + * The entries in this table correspond, line for line, + * with the entries in usb_storage_usb_ids[], defined in usual-tables.c. + */ + +/* + *The vendor name should be kept at eight characters or less, and + * the product name should be kept at 16 characters or less. If a device + * has the US_FL_FIX_INQUIRY flag, then the vendor and product names + * normally generated by a device through the INQUIRY response will be + * taken from this list, and this is the reason for the above size + * restriction. However, if the flag is not present, then you + * are free to use as many characters as you like. + */ + +#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ + vendor_name, product_name, use_protocol, use_transport, \ + init_function, Flags) \ +{ \ + .vendorName = vendor_name, \ + .productName = product_name, \ + .useProtocol = use_protocol, \ + .useTransport = use_transport, \ + .initFunction = init_function, \ +} + +#define COMPLIANT_DEV UNUSUAL_DEV + +#define USUAL_DEV(use_protocol, use_transport) \ +{ \ + .useProtocol = use_protocol, \ + .useTransport = use_transport, \ +} + +#define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \ + vendor_name, product_name, use_protocol, use_transport, \ + init_function, Flags) \ +{ \ + .vendorName = vendor_name, \ + .productName = product_name, \ + .useProtocol = use_protocol, \ + .useTransport = use_transport, \ + .initFunction = init_function, \ +} + +static struct us_unusual_dev us_unusual_dev_list[] = { +# include "unusual_devs.h" + { } /* Terminating entry */ +}; + +static struct us_unusual_dev for_dynamic_ids = + USUAL_DEV(USB_SC_SCSI, USB_PR_BULK); + +#undef UNUSUAL_DEV +#undef COMPLIANT_DEV +#undef USUAL_DEV +#undef UNUSUAL_VENDOR_INTF + +#ifdef CONFIG_LOCKDEP + +static struct lock_class_key us_interface_key[USB_MAXINTERFACES]; + +static void us_set_lock_class(struct mutex *mutex, + struct usb_interface *intf) +{ + struct usb_device *udev = interface_to_usbdev(intf); + struct usb_host_config *config = udev->actconfig; + int i; + + for (i = 0; i < config->desc.bNumInterfaces; i++) { + if (config->interface[i] == intf) + break; + } + + BUG_ON(i == config->desc.bNumInterfaces); + + lockdep_set_class(mutex, &us_interface_key[i]); +} + +#else + +static void us_set_lock_class(struct mutex *mutex, + struct usb_interface *intf) +{ +} + +#endif + +#ifdef CONFIG_PM /* Minimal support for suspend and resume */ + +int usb_stor_suspend(struct usb_interface *iface, pm_message_t message) +{ + struct us_data *us = usb_get_intfdata(iface); + + /* Wait until no command is running */ + mutex_lock(&us->dev_mutex); + + if (us->suspend_resume_hook) + (us->suspend_resume_hook)(us, US_SUSPEND); + + /* + * When runtime PM is working, we'll set a flag to indicate + * whether we should autoresume when a SCSI request arrives. + */ + + mutex_unlock(&us->dev_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(usb_stor_suspend); + +int usb_stor_resume(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + mutex_lock(&us->dev_mutex); + + if (us->suspend_resume_hook) + (us->suspend_resume_hook)(us, US_RESUME); + + mutex_unlock(&us->dev_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(usb_stor_resume); + +int usb_stor_reset_resume(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + /* Report the reset to the SCSI core */ + usb_stor_report_bus_reset(us); + + /* + * If any of the subdrivers implemented a reinitialization scheme, + * this is where the callback would be invoked. + */ + return 0; +} +EXPORT_SYMBOL_GPL(usb_stor_reset_resume); + +#endif /* CONFIG_PM */ + +/* + * The next two routines get called just before and just after + * a USB port reset, whether from this driver or a different one. + */ + +int usb_stor_pre_reset(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + /* Make sure no command runs during the reset */ + mutex_lock(&us->dev_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(usb_stor_pre_reset); + +int usb_stor_post_reset(struct usb_interface *iface) +{ + struct us_data *us = usb_get_intfdata(iface); + + /* Report the reset to the SCSI core */ + usb_stor_report_bus_reset(us); + + /* + * If any of the subdrivers implemented a reinitialization scheme, + * this is where the callback would be invoked. + */ + + mutex_unlock(&us->dev_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(usb_stor_post_reset); + +/* + * fill_inquiry_response takes an unsigned char array (which must + * be at least 36 characters) and populates the vendor name, + * product name, and revision fields. Then the array is copied + * into the SCSI command's response buffer (oddly enough + * called request_buffer). data_len contains the length of the + * data array, which again must be at least 36. + */ + +void fill_inquiry_response(struct us_data *us, unsigned char *data, + unsigned int data_len) +{ + if (data_len < 36) /* You lose. */ + return; + + memset(data+8, ' ', 28); + if (data[0]&0x20) { /* + * USB device currently not connected. Return + * peripheral qualifier 001b ("...however, the + * physical device is not currently connected + * to this logical unit") and leave vendor and + * product identification empty. ("If the target + * does store some of the INQUIRY data on the + * device, it may return zeros or ASCII spaces + * (20h) in those fields until the data is + * available from the device."). + */ + } else { + u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice); + int n; + + n = strlen(us->unusual_dev->vendorName); + memcpy(data+8, us->unusual_dev->vendorName, min(8, n)); + n = strlen(us->unusual_dev->productName); + memcpy(data+16, us->unusual_dev->productName, min(16, n)); + + data[32] = 0x30 + ((bcdDevice>>12) & 0x0F); + data[33] = 0x30 + ((bcdDevice>>8) & 0x0F); + data[34] = 0x30 + ((bcdDevice>>4) & 0x0F); + data[35] = 0x30 + ((bcdDevice) & 0x0F); + } + + usb_stor_set_xfer_buf(data, data_len, us->srb); +} +EXPORT_SYMBOL_GPL(fill_inquiry_response); + +static int usb_stor_control_thread(void * __us) +{ + struct us_data *us = (struct us_data *)__us; + struct Scsi_Host *host = us_to_host(us); + struct scsi_cmnd *srb; + + for (;;) { + usb_stor_dbg(us, "*** thread sleeping\n"); + if (wait_for_completion_interruptible(&us->cmnd_ready)) + break; + + usb_stor_dbg(us, "*** thread awakened\n"); + + /* lock the device pointers */ + mutex_lock(&(us->dev_mutex)); + + /* lock access to the state */ + scsi_lock(host); + + /* When we are called with no command pending, we're done */ + srb = us->srb; + if (srb == NULL) { + scsi_unlock(host); + mutex_unlock(&us->dev_mutex); + usb_stor_dbg(us, "-- exiting\n"); + break; + } + + /* has the command timed out *already* ? */ + if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { + srb->result = DID_ABORT << 16; + goto SkipForAbort; + } + + scsi_unlock(host); + + /* + * reject the command if the direction indicator + * is UNKNOWN + */ + if (srb->sc_data_direction == DMA_BIDIRECTIONAL) { + usb_stor_dbg(us, "UNKNOWN data direction\n"); + srb->result = DID_ERROR << 16; + } + + /* + * reject if target != 0 or if LUN is higher than + * the maximum known LUN + */ + else if (srb->device->id && + !(us->fflags & US_FL_SCM_MULT_TARG)) { + usb_stor_dbg(us, "Bad target number (%d:%llu)\n", + srb->device->id, + srb->device->lun); + srb->result = DID_BAD_TARGET << 16; + } + + else if (srb->device->lun > us->max_lun) { + usb_stor_dbg(us, "Bad LUN (%d:%llu)\n", + srb->device->id, + srb->device->lun); + srb->result = DID_BAD_TARGET << 16; + } + + /* + * Handle those devices which need us to fake + * their inquiry data + */ + else if ((srb->cmnd[0] == INQUIRY) && + (us->fflags & US_FL_FIX_INQUIRY)) { + unsigned char data_ptr[36] = { + 0x00, 0x80, 0x02, 0x02, + 0x1F, 0x00, 0x00, 0x00}; + + usb_stor_dbg(us, "Faking INQUIRY command\n"); + fill_inquiry_response(us, data_ptr, 36); + srb->result = SAM_STAT_GOOD; + } + + /* we've got a command, let's do it! */ + else { + US_DEBUG(usb_stor_show_command(us, srb)); + us->proto_handler(srb, us); + usb_mark_last_busy(us->pusb_dev); + } + + /* lock access to the state */ + scsi_lock(host); + + /* was the command aborted? */ + if (srb->result == DID_ABORT << 16) { +SkipForAbort: + usb_stor_dbg(us, "scsi command aborted\n"); + srb = NULL; /* Don't call srb->scsi_done() */ + } + + /* + * If an abort request was received we need to signal that + * the abort has finished. The proper test for this is + * the TIMED_OUT flag, not srb->result == DID_ABORT, because + * the timeout might have occurred after the command had + * already completed with a different result code. + */ + if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { + complete(&(us->notify)); + + /* Allow USB transfers to resume */ + clear_bit(US_FLIDX_ABORTING, &us->dflags); + clear_bit(US_FLIDX_TIMED_OUT, &us->dflags); + } + + /* finished working on this command */ + us->srb = NULL; + scsi_unlock(host); + + /* unlock the device pointers */ + mutex_unlock(&us->dev_mutex); + + /* now that the locks are released, notify the SCSI core */ + if (srb) { + usb_stor_dbg(us, "scsi cmd done, result=0x%x\n", + srb->result); + srb->scsi_done(srb); + } + } /* for (;;) */ + + /* Wait until we are told to stop */ + for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + if (kthread_should_stop()) + break; + schedule(); + } + __set_current_state(TASK_RUNNING); + return 0; +} + +/*********************************************************************** + * Device probing and disconnecting + ***********************************************************************/ + +/* Associate our private data with the USB device */ +static int associate_dev(struct us_data *us, struct usb_interface *intf) +{ + /* Fill in the device-related fields */ + us->pusb_dev = interface_to_usbdev(intf); + us->pusb_intf = intf; + us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; + usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n", + le16_to_cpu(us->pusb_dev->descriptor.idVendor), + le16_to_cpu(us->pusb_dev->descriptor.idProduct), + le16_to_cpu(us->pusb_dev->descriptor.bcdDevice)); + usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n", + intf->cur_altsetting->desc.bInterfaceSubClass, + intf->cur_altsetting->desc.bInterfaceProtocol); + + /* Store our private data in the interface */ + usb_set_intfdata(intf, us); + + /* Allocate the control/setup and DMA-mapped buffers */ + us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL); + if (!us->cr) + return -ENOMEM; + + us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE, + GFP_KERNEL, &us->iobuf_dma); + if (!us->iobuf) { + usb_stor_dbg(us, "I/O buffer allocation failed\n"); + return -ENOMEM; + } + return 0; +} + +/* Works only for digits and letters, but small and fast */ +#define TOLOWER(x) ((x) | 0x20) + +/* Adjust device flags based on the "quirks=" module parameter */ +void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags) +{ + char *p; + u16 vid = le16_to_cpu(udev->descriptor.idVendor); + u16 pid = le16_to_cpu(udev->descriptor.idProduct); + unsigned f = 0; + unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE | + US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS | + US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE | + US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 | + US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE | + US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT | + US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 | + US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE | + US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES | + US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS | + US_FL_ALWAYS_SYNC); + + p = quirks; + while (*p) { + /* Each entry consists of VID:PID:flags */ + if (vid == simple_strtoul(p, &p, 16) && + *p == ':' && + pid == simple_strtoul(p+1, &p, 16) && + *p == ':') + break; + + /* Move forward to the next entry */ + while (*p) { + if (*p++ == ',') + break; + } + } + if (!*p) /* No match */ + return; + + /* Collect the flags */ + while (*++p && *p != ',') { + switch (TOLOWER(*p)) { + case 'a': + f |= US_FL_SANE_SENSE; + break; + case 'b': + f |= US_FL_BAD_SENSE; + break; + case 'c': + f |= US_FL_FIX_CAPACITY; + break; + case 'd': + f |= US_FL_NO_READ_DISC_INFO; + break; + case 'e': + f |= US_FL_NO_READ_CAPACITY_16; + break; + case 'f': + f |= US_FL_NO_REPORT_OPCODES; + break; + case 'g': + f |= US_FL_MAX_SECTORS_240; + break; + case 'h': + f |= US_FL_CAPACITY_HEURISTICS; + break; + case 'i': + f |= US_FL_IGNORE_DEVICE; + break; + case 'j': + f |= US_FL_NO_REPORT_LUNS; + break; + case 'k': + f |= US_FL_NO_SAME; + break; + case 'l': + f |= US_FL_NOT_LOCKABLE; + break; + case 'm': + f |= US_FL_MAX_SECTORS_64; + break; + case 'n': + f |= US_FL_INITIAL_READ10; + break; + case 'o': + f |= US_FL_CAPACITY_OK; + break; + case 'p': + f |= US_FL_WRITE_CACHE; + break; + case 'r': + f |= US_FL_IGNORE_RESIDUE; + break; + case 's': + f |= US_FL_SINGLE_LUN; + break; + case 't': + f |= US_FL_NO_ATA_1X; + break; + case 'u': + f |= US_FL_IGNORE_UAS; + break; + case 'w': + f |= US_FL_NO_WP_DETECT; + break; + case 'y': + f |= US_FL_ALWAYS_SYNC; + break; + /* Ignore unrecognized flag characters */ + } + } + *fflags = (*fflags & ~mask) | f; +} +EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks); + +/* Get the unusual_devs entries and the string descriptors */ +static int get_device_info(struct us_data *us, const struct usb_device_id *id, + struct us_unusual_dev *unusual_dev) +{ + struct usb_device *dev = us->pusb_dev; + struct usb_interface_descriptor *idesc = + &us->pusb_intf->cur_altsetting->desc; + struct device *pdev = &us->pusb_intf->dev; + + /* Store the entries */ + us->unusual_dev = unusual_dev; + us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ? + idesc->bInterfaceSubClass : + unusual_dev->useProtocol; + us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ? + idesc->bInterfaceProtocol : + unusual_dev->useTransport; + us->fflags = id->driver_info; + usb_stor_adjust_quirks(us->pusb_dev, &us->fflags); + + if (us->fflags & US_FL_IGNORE_DEVICE) { + dev_info(pdev, "device ignored\n"); + return -ENODEV; + } + + /* + * This flag is only needed when we're in high-speed, so let's + * disable it if we're in full-speed + */ + if (dev->speed != USB_SPEED_HIGH) + us->fflags &= ~US_FL_GO_SLOW; + + if (us->fflags) + dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n", + le16_to_cpu(dev->descriptor.idVendor), + le16_to_cpu(dev->descriptor.idProduct), + us->fflags); + + /* + * Log a message if a non-generic unusual_dev entry contains an + * unnecessary subclass or protocol override. This may stimulate + * reports from users that will help us remove unneeded entries + * from the unusual_devs.h table. + */ + if (id->idVendor || id->idProduct) { + static const char *msgs[3] = { + "an unneeded SubClass entry", + "an unneeded Protocol entry", + "unneeded SubClass and Protocol entries"}; + struct usb_device_descriptor *ddesc = &dev->descriptor; + int msg = -1; + + if (unusual_dev->useProtocol != USB_SC_DEVICE && + us->subclass == idesc->bInterfaceSubClass) + msg += 1; + if (unusual_dev->useTransport != USB_PR_DEVICE && + us->protocol == idesc->bInterfaceProtocol) + msg += 2; + if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE)) + dev_notice(pdev, "This device " + "(%04x,%04x,%04x S %02x P %02x)" + " has %s in unusual_devs.h (kernel" + " %s)\n" + " Please send a copy of this message to " + "<linux-usb@vger.kernel.org> and " + "<usb-storage@lists.one-eyed-alien.net>\n", + le16_to_cpu(ddesc->idVendor), + le16_to_cpu(ddesc->idProduct), + le16_to_cpu(ddesc->bcdDevice), + idesc->bInterfaceSubClass, + idesc->bInterfaceProtocol, + msgs[msg], + utsname()->release); + } + + return 0; +} + +/* Get the transport settings */ +static void get_transport(struct us_data *us) +{ + switch (us->protocol) { + case USB_PR_CB: + us->transport_name = "Control/Bulk"; + us->transport = usb_stor_CB_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 7; + break; + + case USB_PR_CBI: + us->transport_name = "Control/Bulk/Interrupt"; + us->transport = usb_stor_CB_transport; + us->transport_reset = usb_stor_CB_reset; + us->max_lun = 7; + break; + + case USB_PR_BULK: + us->transport_name = "Bulk"; + us->transport = usb_stor_Bulk_transport; + us->transport_reset = usb_stor_Bulk_reset; + break; + } +} + +/* Get the protocol settings */ +static void get_protocol(struct us_data *us) +{ + switch (us->subclass) { + case USB_SC_RBC: + us->protocol_name = "Reduced Block Commands (RBC)"; + us->proto_handler = usb_stor_transparent_scsi_command; + break; + + case USB_SC_8020: + us->protocol_name = "8020i"; + us->proto_handler = usb_stor_pad12_command; + us->max_lun = 0; + break; + + case USB_SC_QIC: + us->protocol_name = "QIC-157"; + us->proto_handler = usb_stor_pad12_command; + us->max_lun = 0; + break; + + case USB_SC_8070: + us->protocol_name = "8070i"; + us->proto_handler = usb_stor_pad12_command; + us->max_lun = 0; + break; + + case USB_SC_SCSI: + us->protocol_name = "Transparent SCSI"; + us->proto_handler = usb_stor_transparent_scsi_command; + break; + + case USB_SC_UFI: + us->protocol_name = "Uniform Floppy Interface (UFI)"; + us->proto_handler = usb_stor_ufi_command; + break; + } +} + +/* Get the pipe settings */ +static int get_pipes(struct us_data *us) +{ + struct usb_host_interface *alt = us->pusb_intf->cur_altsetting; + struct usb_endpoint_descriptor *ep_in; + struct usb_endpoint_descriptor *ep_out; + struct usb_endpoint_descriptor *ep_int; + int res; + + /* + * Find the first endpoint of each type we need. + * We are expecting a minimum of 2 endpoints - in and out (bulk). + * An optional interrupt-in is OK (necessary for CBI protocol). + * We will ignore any others. + */ + res = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL); + if (res) { + usb_stor_dbg(us, "bulk endpoints not found\n"); + return res; + } + + res = usb_find_int_in_endpoint(alt, &ep_int); + if (res && us->protocol == USB_PR_CBI) { + usb_stor_dbg(us, "interrupt endpoint not found\n"); + return res; + } + + /* Calculate and store the pipe values */ + us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0); + us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0); + us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, + usb_endpoint_num(ep_out)); + us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, + usb_endpoint_num(ep_in)); + if (ep_int) { + us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, + usb_endpoint_num(ep_int)); + us->ep_bInterval = ep_int->bInterval; + } + return 0; +} + +/* Initialize all the dynamic resources we need */ +static int usb_stor_acquire_resources(struct us_data *us) +{ + int p; + struct task_struct *th; + + us->current_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!us->current_urb) + return -ENOMEM; + + /* + * Just before we start our control thread, initialize + * the device if it needs initialization + */ + if (us->unusual_dev->initFunction) { + p = us->unusual_dev->initFunction(us); + if (p) + return p; + } + + /* Start up our control thread */ + th = kthread_run(usb_stor_control_thread, us, "usb-storage"); + if (IS_ERR(th)) { + dev_warn(&us->pusb_intf->dev, + "Unable to start control thread\n"); + return PTR_ERR(th); + } + us->ctl_thread = th; + + return 0; +} + +/* Release all our dynamic resources */ +static void usb_stor_release_resources(struct us_data *us) +{ + /* + * Tell the control thread to exit. The SCSI host must + * already have been removed and the DISCONNECTING flag set + * so that we won't accept any more commands. + */ + usb_stor_dbg(us, "-- sending exit command to thread\n"); + complete(&us->cmnd_ready); + if (us->ctl_thread) + kthread_stop(us->ctl_thread); + + /* Call the destructor routine, if it exists */ + if (us->extra_destructor) { + usb_stor_dbg(us, "-- calling extra_destructor()\n"); + us->extra_destructor(us->extra); + } + + /* Free the extra data and the URB */ + kfree(us->extra); + usb_free_urb(us->current_urb); +} + +/* Dissociate from the USB device */ +static void dissociate_dev(struct us_data *us) +{ + /* Free the buffers */ + kfree(us->cr); + usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma); + + /* Remove our private data from the interface */ + usb_set_intfdata(us->pusb_intf, NULL); +} + +/* + * First stage of disconnect processing: stop SCSI scanning, + * remove the host, and stop accepting new commands + */ +static void quiesce_and_remove_host(struct us_data *us) +{ + struct Scsi_Host *host = us_to_host(us); + + /* If the device is really gone, cut short reset delays */ + if (us->pusb_dev->state == USB_STATE_NOTATTACHED) { + set_bit(US_FLIDX_DISCONNECTING, &us->dflags); + wake_up(&us->delay_wait); + } + + /* + * Prevent SCSI scanning (if it hasn't started yet) + * or wait for the SCSI-scanning routine to stop. + */ + cancel_delayed_work_sync(&us->scan_dwork); + + /* Balance autopm calls if scanning was cancelled */ + if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags)) + usb_autopm_put_interface_no_suspend(us->pusb_intf); + + /* + * Removing the host will perform an orderly shutdown: caches + * synchronized, disks spun down, etc. + */ + scsi_remove_host(host); + + /* + * Prevent any new commands from being accepted and cut short + * reset delays. + */ + scsi_lock(host); + set_bit(US_FLIDX_DISCONNECTING, &us->dflags); + scsi_unlock(host); + wake_up(&us->delay_wait); +} + +/* Second stage of disconnect processing: deallocate all resources */ +static void release_everything(struct us_data *us) +{ + usb_stor_release_resources(us); + dissociate_dev(us); + + /* + * Drop our reference to the host; the SCSI core will free it + * (and "us" along with it) when the refcount becomes 0. + */ + scsi_host_put(us_to_host(us)); +} + +/* Delayed-work routine to carry out SCSI-device scanning */ +static void usb_stor_scan_dwork(struct work_struct *work) +{ + struct us_data *us = container_of(work, struct us_data, + scan_dwork.work); + struct device *dev = &us->pusb_intf->dev; + + dev_dbg(dev, "starting scan\n"); + + /* For bulk-only devices, determine the max LUN value */ + if (us->protocol == USB_PR_BULK && + !(us->fflags & US_FL_SINGLE_LUN) && + !(us->fflags & US_FL_SCM_MULT_TARG)) { + mutex_lock(&us->dev_mutex); + us->max_lun = usb_stor_Bulk_max_lun(us); + /* + * Allow proper scanning of devices that present more than 8 LUNs + * While not affecting other devices that may need the previous + * behavior + */ + if (us->max_lun >= 8) + us_to_host(us)->max_lun = us->max_lun+1; + mutex_unlock(&us->dev_mutex); + } + scsi_scan_host(us_to_host(us)); + dev_dbg(dev, "scan complete\n"); + + /* Should we unbind if no devices were detected? */ + + usb_autopm_put_interface(us->pusb_intf); + clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags); +} + +static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf) +{ + struct usb_device *usb_dev = interface_to_usbdev(intf); + + if (usb_dev->bus->sg_tablesize) { + return usb_dev->bus->sg_tablesize; + } + return SG_ALL; +} + +/* First part of general USB mass-storage probing */ +int usb_stor_probe1(struct us_data **pus, + struct usb_interface *intf, + const struct usb_device_id *id, + struct us_unusual_dev *unusual_dev, + struct scsi_host_template *sht) +{ + struct Scsi_Host *host; + struct us_data *us; + int result; + + dev_info(&intf->dev, "USB Mass Storage device detected\n"); + + /* + * Ask the SCSI layer to allocate a host structure, with extra + * space at the end for our private us_data structure. + */ + host = scsi_host_alloc(sht, sizeof(*us)); + if (!host) { + dev_warn(&intf->dev, "Unable to allocate the scsi host\n"); + return -ENOMEM; + } + + /* + * Allow 16-byte CDBs and thus > 2TB + */ + host->max_cmd_len = 16; + host->sg_tablesize = usb_stor_sg_tablesize(intf); + *pus = us = host_to_us(host); + mutex_init(&(us->dev_mutex)); + us_set_lock_class(&us->dev_mutex, intf); + init_completion(&us->cmnd_ready); + init_completion(&(us->notify)); + init_waitqueue_head(&us->delay_wait); + INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork); + + /* Associate the us_data structure with the USB device */ + result = associate_dev(us, intf); + if (result) + goto BadDevice; + + /* Get the unusual_devs entries and the descriptors */ + result = get_device_info(us, id, unusual_dev); + if (result) + goto BadDevice; + + /* Get standard transport and protocol settings */ + get_transport(us); + get_protocol(us); + + /* + * Give the caller a chance to fill in specialized transport + * or protocol settings. + */ + return 0; + +BadDevice: + usb_stor_dbg(us, "storage_probe() failed\n"); + release_everything(us); + return result; +} +EXPORT_SYMBOL_GPL(usb_stor_probe1); + +/* Second part of general USB mass-storage probing */ +int usb_stor_probe2(struct us_data *us) +{ + int result; + struct device *dev = &us->pusb_intf->dev; + + /* Make sure the transport and protocol have both been set */ + if (!us->transport || !us->proto_handler) { + result = -ENXIO; + goto BadDevice; + } + usb_stor_dbg(us, "Transport: %s\n", us->transport_name); + usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name); + + if (us->fflags & US_FL_SCM_MULT_TARG) { + /* + * SCM eUSCSI bridge devices can have different numbers + * of LUNs on different targets; allow all to be probed. + */ + us->max_lun = 7; + /* The eUSCSI itself has ID 7, so avoid scanning that */ + us_to_host(us)->this_id = 7; + /* max_id is 8 initially, so no need to set it here */ + } else { + /* In the normal case there is only a single target */ + us_to_host(us)->max_id = 1; + /* + * Like Windows, we won't store the LUN bits in CDB[1] for + * SCSI-2 devices using the Bulk-Only transport (even though + * this violates the SCSI spec). + */ + if (us->transport == usb_stor_Bulk_transport) + us_to_host(us)->no_scsi2_lun_in_cdb = 1; + } + + /* fix for single-lun devices */ + if (us->fflags & US_FL_SINGLE_LUN) + us->max_lun = 0; + + /* Find the endpoints and calculate pipe values */ + result = get_pipes(us); + if (result) + goto BadDevice; + + /* + * If the device returns invalid data for the first READ(10) + * command, indicate the command should be retried. + */ + if (us->fflags & US_FL_INITIAL_READ10) + set_bit(US_FLIDX_REDO_READ10, &us->dflags); + + /* Acquire all the other resources and add the host */ + result = usb_stor_acquire_resources(us); + if (result) + goto BadDevice; + usb_autopm_get_interface_no_resume(us->pusb_intf); + snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s", + dev_name(&us->pusb_intf->dev)); + result = scsi_add_host(us_to_host(us), dev); + if (result) { + dev_warn(dev, + "Unable to add the scsi host\n"); + goto HostAddErr; + } + + /* Submit the delayed_work for SCSI-device scanning */ + set_bit(US_FLIDX_SCAN_PENDING, &us->dflags); + + if (delay_use > 0) + dev_dbg(dev, "waiting for device to settle before scanning\n"); + queue_delayed_work(system_freezable_wq, &us->scan_dwork, + delay_use * HZ); + return 0; + + /* We come here if there are any problems */ +HostAddErr: + usb_autopm_put_interface_no_suspend(us->pusb_intf); +BadDevice: + usb_stor_dbg(us, "storage_probe() failed\n"); + release_everything(us); + return result; +} +EXPORT_SYMBOL_GPL(usb_stor_probe2); + +/* Handle a USB mass-storage disconnect */ +void usb_stor_disconnect(struct usb_interface *intf) +{ + struct us_data *us = usb_get_intfdata(intf); + + quiesce_and_remove_host(us); + release_everything(us); +} +EXPORT_SYMBOL_GPL(usb_stor_disconnect); + +static struct scsi_host_template usb_stor_host_template; + +/* The main probe routine for standard devices */ +static int storage_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct us_unusual_dev *unusual_dev; + struct us_data *us; + int result; + int size; + + /* If uas is enabled and this device can do uas then ignore it. */ +#if IS_ENABLED(CONFIG_USB_UAS) + if (uas_use_uas_driver(intf, id, NULL)) + return -ENXIO; +#endif + + /* + * If the device isn't standard (is handled by a subdriver + * module) then don't accept it. + */ + if (usb_usual_ignore_device(intf)) + return -ENXIO; + + /* + * Call the general probe procedures. + * + * The unusual_dev_list array is parallel to the usb_storage_usb_ids + * table, so we use the index of the id entry to find the + * corresponding unusual_devs entry. + */ + + size = ARRAY_SIZE(us_unusual_dev_list); + if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) { + unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list; + } else { + unusual_dev = &for_dynamic_ids; + + dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n", + id->idVendor, id->idProduct); + } + + result = usb_stor_probe1(&us, intf, id, unusual_dev, + &usb_stor_host_template); + if (result) + return result; + + /* No special transport or protocol settings in the main module */ + + result = usb_stor_probe2(us); + return result; +} + +static struct usb_driver usb_storage_driver = { + .name = DRV_NAME, + .probe = storage_probe, + .disconnect = usb_stor_disconnect, + .suspend = usb_stor_suspend, + .resume = usb_stor_resume, + .reset_resume = usb_stor_reset_resume, + .pre_reset = usb_stor_pre_reset, + .post_reset = usb_stor_post_reset, + .id_table = usb_storage_usb_ids, + .supports_autosuspend = 1, + .soft_unbind = 1, +}; + +module_usb_stor_driver(usb_storage_driver, usb_stor_host_template, DRV_NAME); |