2 * cdc2.c -- CDC Composite driver, with ECM and ACM support
4 * Copyright (C) 2008 David Brownell
5 * Copyright (C) 2008 Nokia Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
20 #define DRIVER_DESC "CDC Composite Gadget"
21 #define DRIVER_VERSION "King Kamehameha Day 2008"
23 /*-------------------------------------------------------------------------*/
25 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
26 * Instead: allocate your own, using normal USB-IF procedures.
29 /* Thanks to NetChip Technologies for donating this product ID.
30 * It's for devices with only this composite CDC configuration.
32 #define CDC_VENDOR_NUM 0x0525 /* NetChip */
33 #define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
35 /*-------------------------------------------------------------------------*/
36 USB_GADGET_COMPOSITE_OPTIONS();
39 * Kbuild is not very cooperative with respect to linking separately
40 * compiled library objects into one module. So for now we won't use
41 * separate compilation ... ensuring init/exit sections work to shrink
42 * the runtime footprint, and giving us at least some parts of what
43 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
51 /*-------------------------------------------------------------------------*/
53 static struct usb_device_descriptor device_desc = {
54 .bLength = sizeof device_desc,
55 .bDescriptorType = USB_DT_DEVICE,
57 .bcdUSB = cpu_to_le16(0x0200),
59 .bDeviceClass = USB_CLASS_COMM,
62 /* .bMaxPacketSize0 = f(hardware) */
64 /* Vendor and product id can be overridden by module parameters. */
65 .idVendor = cpu_to_le16(CDC_VENDOR_NUM),
66 .idProduct = cpu_to_le16(CDC_PRODUCT_NUM),
67 /* .bcdDevice = f(hardware) */
68 /* .iManufacturer = DYNAMIC */
69 /* .iProduct = DYNAMIC */
70 /* NO SERIAL NUMBER */
71 .bNumConfigurations = 1,
74 static struct usb_otg_descriptor otg_descriptor = {
75 .bLength = sizeof otg_descriptor,
76 .bDescriptorType = USB_DT_OTG,
78 /* REVISIT SRP-only hardware is possible, although
79 * it would not be called "OTG" ...
81 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
84 static const struct usb_descriptor_header *otg_desc[] = {
85 (struct usb_descriptor_header *) &otg_descriptor,
90 /* string IDs are assigned dynamically */
91 static struct usb_string strings_dev[] = {
92 [USB_GADGET_MANUFACTURER_IDX].s = "",
93 [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
94 [USB_GADGET_SERIAL_IDX].s = "",
98 static struct usb_gadget_strings stringtab_dev = {
99 .language = 0x0409, /* en-us */
100 .strings = strings_dev,
103 static struct usb_gadget_strings *dev_strings[] = {
108 static u8 hostaddr[ETH_ALEN];
110 /*-------------------------------------------------------------------------*/
113 * We _always_ have both CDC ECM and CDC ACM functions.
115 static int __init cdc_do_config(struct usb_configuration *c)
119 if (gadget_is_otg(c->cdev->gadget)) {
120 c->descriptors = otg_desc;
121 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
124 status = ecm_bind_config(c, hostaddr);
128 status = acm_bind_config(c, 0);
135 static struct usb_configuration cdc_config_driver = {
136 .label = "CDC Composite (ECM + ACM)",
137 .bConfigurationValue = 1,
138 /* .iConfiguration = DYNAMIC */
139 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
142 /*-------------------------------------------------------------------------*/
144 static int __init cdc_bind(struct usb_composite_dev *cdev)
147 struct usb_gadget *gadget = cdev->gadget;
150 if (!can_support_ecm(cdev->gadget)) {
151 dev_err(&gadget->dev, "controller '%s' not usable\n",
156 /* set up network link layer */
157 status = gether_setup(cdev->gadget, hostaddr);
161 /* set up serial link layer */
162 status = gserial_setup(cdev->gadget, 1);
166 gcnum = usb_gadget_controller_number(gadget);
168 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
170 /* We assume that can_support_ecm() tells the truth;
171 * but if the controller isn't recognized at all then
172 * that assumption is a bit more likely to be wrong.
174 WARNING(cdev, "controller '%s' not recognized; trying %s\n",
176 cdc_config_driver.label);
177 device_desc.bcdDevice =
178 cpu_to_le16(0x0300 | 0x0099);
181 /* Allocate string descriptor numbers ... note that string
182 * contents can be overridden by the composite_dev glue.
185 status = usb_string_ids_tab(cdev, strings_dev);
188 device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
189 device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
191 /* register our configuration */
192 status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
196 usb_composite_overwrite_options(cdev, &coverwrite);
197 dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
209 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
216 static __refdata struct usb_composite_driver cdc_driver = {
219 .strings = dev_strings,
220 .max_speed = USB_SPEED_HIGH,
222 .unbind = __exit_p(cdc_unbind),
225 MODULE_DESCRIPTION(DRIVER_DESC);
226 MODULE_AUTHOR("David Brownell");
227 MODULE_LICENSE("GPL");
229 static int __init init(void)
231 return usb_composite_probe(&cdc_driver);
235 static void __exit cleanup(void)
237 usb_composite_unregister(&cdc_driver);
239 module_exit(cleanup);