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path: root/drivers/usb/gadget/legacy/cdc2.c
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Diffstat (limited to 'drivers/usb/gadget/legacy/cdc2.c')
-rw-r--r--drivers/usb/gadget/legacy/cdc2.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/cdc2.c b/drivers/usb/gadget/legacy/cdc2.c
new file mode 100644
index 000000000..563363aba
--- /dev/null
+++ b/drivers/usb/gadget/legacy/cdc2.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * cdc2.c -- CDC Composite driver, with ECM and ACM support
+ *
+ * Copyright (C) 2008 David Brownell
+ * Copyright (C) 2008 Nokia Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "u_ether.h"
+#include "u_serial.h"
+#include "u_ecm.h"
+
+
+#define DRIVER_DESC "CDC Composite Gadget"
+#define DRIVER_VERSION "King Kamehameha Day 2008"
+
+/*-------------------------------------------------------------------------*/
+
+/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures.
+ */
+
+/* Thanks to NetChip Technologies for donating this product ID.
+ * It's for devices with only this composite CDC configuration.
+ */
+#define CDC_VENDOR_NUM 0x0525 /* NetChip */
+#define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
+
+USB_GADGET_COMPOSITE_OPTIONS();
+
+USB_ETHERNET_MODULE_PARAMETERS();
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_device_descriptor device_desc = {
+ .bLength = sizeof device_desc,
+ .bDescriptorType = USB_DT_DEVICE,
+
+ /* .bcdUSB = DYNAMIC */
+
+ .bDeviceClass = USB_CLASS_COMM,
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+ /* .bMaxPacketSize0 = f(hardware) */
+
+ /* Vendor and product id can be overridden by module parameters. */
+ .idVendor = cpu_to_le16(CDC_VENDOR_NUM),
+ .idProduct = cpu_to_le16(CDC_PRODUCT_NUM),
+ /* .bcdDevice = f(hardware) */
+ /* .iManufacturer = DYNAMIC */
+ /* .iProduct = DYNAMIC */
+ /* NO SERIAL NUMBER */
+ .bNumConfigurations = 1,
+};
+
+static const struct usb_descriptor_header *otg_desc[2];
+
+/* string IDs are assigned dynamically */
+static struct usb_string strings_dev[] = {
+ [USB_GADGET_MANUFACTURER_IDX].s = "",
+ [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
+ [USB_GADGET_SERIAL_IDX].s = "",
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_dev,
+};
+
+static struct usb_gadget_strings *dev_strings[] = {
+ &stringtab_dev,
+ NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+static struct usb_function *f_acm;
+static struct usb_function_instance *fi_serial;
+
+static struct usb_function *f_ecm;
+static struct usb_function_instance *fi_ecm;
+
+/*
+ * We _always_ have both CDC ECM and CDC ACM functions.
+ */
+static int cdc_do_config(struct usb_configuration *c)
+{
+ int status;
+
+ if (gadget_is_otg(c->cdev->gadget)) {
+ c->descriptors = otg_desc;
+ c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+ }
+
+ f_ecm = usb_get_function(fi_ecm);
+ if (IS_ERR(f_ecm)) {
+ status = PTR_ERR(f_ecm);
+ goto err_get_ecm;
+ }
+
+ status = usb_add_function(c, f_ecm);
+ if (status)
+ goto err_add_ecm;
+
+ f_acm = usb_get_function(fi_serial);
+ if (IS_ERR(f_acm)) {
+ status = PTR_ERR(f_acm);
+ goto err_get_acm;
+ }
+
+ status = usb_add_function(c, f_acm);
+ if (status)
+ goto err_add_acm;
+ return 0;
+
+err_add_acm:
+ usb_put_function(f_acm);
+err_get_acm:
+ usb_remove_function(c, f_ecm);
+err_add_ecm:
+ usb_put_function(f_ecm);
+err_get_ecm:
+ return status;
+}
+
+static struct usb_configuration cdc_config_driver = {
+ .label = "CDC Composite (ECM + ACM)",
+ .bConfigurationValue = 1,
+ /* .iConfiguration = DYNAMIC */
+ .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int cdc_bind(struct usb_composite_dev *cdev)
+{
+ struct usb_gadget *gadget = cdev->gadget;
+ struct f_ecm_opts *ecm_opts;
+ int status;
+
+ if (!can_support_ecm(cdev->gadget)) {
+ dev_err(&gadget->dev, "controller '%s' not usable\n",
+ gadget->name);
+ return -EINVAL;
+ }
+
+ fi_ecm = usb_get_function_instance("ecm");
+ if (IS_ERR(fi_ecm))
+ return PTR_ERR(fi_ecm);
+
+ ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
+
+ gether_set_qmult(ecm_opts->net, qmult);
+ if (!gether_set_host_addr(ecm_opts->net, host_addr))
+ pr_info("using host ethernet address: %s", host_addr);
+ if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
+ pr_info("using self ethernet address: %s", dev_addr);
+
+ fi_serial = usb_get_function_instance("acm");
+ if (IS_ERR(fi_serial)) {
+ status = PTR_ERR(fi_serial);
+ goto fail;
+ }
+
+ /* Allocate string descriptor numbers ... note that string
+ * contents can be overridden by the composite_dev glue.
+ */
+
+ status = usb_string_ids_tab(cdev, strings_dev);
+ if (status < 0)
+ goto fail1;
+ device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
+ device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
+
+ if (gadget_is_otg(gadget) && !otg_desc[0]) {
+ struct usb_descriptor_header *usb_desc;
+
+ usb_desc = usb_otg_descriptor_alloc(gadget);
+ if (!usb_desc) {
+ status = -ENOMEM;
+ goto fail1;
+ }
+ usb_otg_descriptor_init(gadget, usb_desc);
+ otg_desc[0] = usb_desc;
+ otg_desc[1] = NULL;
+ }
+
+ /* register our configuration */
+ status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
+ if (status < 0)
+ goto fail2;
+
+ usb_composite_overwrite_options(cdev, &coverwrite);
+ dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
+ DRIVER_DESC);
+
+ return 0;
+
+fail2:
+ kfree(otg_desc[0]);
+ otg_desc[0] = NULL;
+fail1:
+ usb_put_function_instance(fi_serial);
+fail:
+ usb_put_function_instance(fi_ecm);
+ return status;
+}
+
+static int cdc_unbind(struct usb_composite_dev *cdev)
+{
+ usb_put_function(f_acm);
+ usb_put_function_instance(fi_serial);
+ if (!IS_ERR_OR_NULL(f_ecm))
+ usb_put_function(f_ecm);
+ if (!IS_ERR_OR_NULL(fi_ecm))
+ usb_put_function_instance(fi_ecm);
+ kfree(otg_desc[0]);
+ otg_desc[0] = NULL;
+
+ return 0;
+}
+
+static struct usb_composite_driver cdc_driver = {
+ .name = "g_cdc",
+ .dev = &device_desc,
+ .strings = dev_strings,
+ .max_speed = USB_SPEED_SUPER,
+ .bind = cdc_bind,
+ .unbind = cdc_unbind,
+};
+
+module_usb_composite_driver(cdc_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("David Brownell");
+MODULE_LICENSE("GPL");