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.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/kernel.h>
23 #include <linux/utsname.h>
29 #define DRIVER_DESC "CDC Composite Gadget"
30 #define DRIVER_VERSION "King Kamehameha Day 2008"
32 /*-------------------------------------------------------------------------*/
34 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
35 * Instead: allocate your own, using normal USB-IF procedures.
38 /* Thanks to NetChip Technologies for donating this product ID.
39 * It's for devices with only this composite CDC configuration.
41 #define CDC_VENDOR_NUM 0x0525 /* NetChip */
42 #define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
44 /*-------------------------------------------------------------------------*/
46 static struct usb_device_descriptor device_desc = {
47 .bLength = sizeof device_desc,
48 .bDescriptorType = USB_DT_DEVICE,
50 .bcdUSB = __constant_cpu_to_le16(0x0200),
52 .bDeviceClass = USB_CLASS_COMM,
55 /* .bMaxPacketSize0 = f(hardware) */
57 /* Vendor and product id can be overridden by module parameters. */
58 .idVendor = __constant_cpu_to_le16(CDC_VENDOR_NUM),
59 .idProduct = __constant_cpu_to_le16(CDC_PRODUCT_NUM),
60 /* .bcdDevice = f(hardware) */
61 /* .iManufacturer = DYNAMIC */
62 /* .iProduct = DYNAMIC */
63 /* NO SERIAL NUMBER */
64 .bNumConfigurations = 1,
67 static struct usb_otg_descriptor otg_descriptor = {
68 .bLength = sizeof otg_descriptor,
69 .bDescriptorType = USB_DT_OTG,
71 /* REVISIT SRP-only hardware is possible, although
72 * it would not be called "OTG" ...
74 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
77 static const struct usb_descriptor_header *otg_desc[] = {
78 (struct usb_descriptor_header *) &otg_descriptor,
83 /* string IDs are assigned dynamically */
85 #define STRING_MANUFACTURER_IDX 0
86 #define STRING_PRODUCT_IDX 1
88 static char manufacturer[50];
90 static struct usb_string strings_dev[] = {
91 [STRING_MANUFACTURER_IDX].s = manufacturer,
92 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
96 static struct usb_gadget_strings stringtab_dev = {
97 .language = 0x0409, /* en-us */
98 .strings = strings_dev,
101 static struct usb_gadget_strings *dev_strings[] = {
106 static u8 hostaddr[ETH_ALEN];
108 /*-------------------------------------------------------------------------*/
111 * We _always_ have both CDC ECM and CDC ACM functions.
113 static int __init cdc_do_config(struct usb_configuration *c)
117 if (gadget_is_otg(c->cdev->gadget)) {
118 c->descriptors = otg_desc;
119 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
122 status = ecm_bind_config(c, hostaddr);
126 status = acm_bind_config(c, 0);
133 static struct usb_configuration cdc_config_driver = {
134 .label = "CDC Composite (ECM + ACM)",
135 .bind = cdc_do_config,
136 .bConfigurationValue = 1,
137 /* .iConfiguration = DYNAMIC */
138 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
139 .bMaxPower = 1, /* 2 mA, minimal */
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 ERROR(cdev, "controller '%s' not usable\n", gadget->name);
155 /* set up network link layer */
156 status = gether_setup(cdev->gadget, hostaddr);
160 /* set up serial link layer */
161 status = gserial_setup(cdev->gadget, 1);
165 gcnum = usb_gadget_controller_number(gadget);
167 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
169 /* We assume that can_support_ecm() tells the truth;
170 * but if the controller isn't recognized at all then
171 * that assumption is a bit more likely to be wrong.
173 WARN(cdev, "controller '%s' not recognized; trying %s\n",
175 cdc_config_driver.label);
176 device_desc.bcdDevice =
177 __constant_cpu_to_le16(0x0300 | 0x0099);
181 /* Allocate string descriptor numbers ... note that string
182 * contents can be overridden by the composite_dev glue.
185 /* device descriptor strings: manufacturer, product */
186 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
187 init_utsname()->sysname, init_utsname()->release,
189 status = usb_string_id(cdev);
192 strings_dev[STRING_MANUFACTURER_IDX].id = status;
193 device_desc.iManufacturer = status;
195 status = usb_string_id(cdev);
198 strings_dev[STRING_PRODUCT_IDX].id = status;
199 device_desc.iProduct = status;
201 /* register our configuration */
202 status = usb_add_config(cdev, &cdc_config_driver);
206 INFO(cdev, "%s, version: " DRIVER_VERSION "\n", DRIVER_DESC);
217 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
224 static struct usb_composite_driver cdc_driver = {
227 .strings = dev_strings,
229 .unbind = __exit_p(cdc_unbind),
232 MODULE_DESCRIPTION(DRIVER_DESC);
233 MODULE_AUTHOR("David Brownell");
234 MODULE_LICENSE("GPL");
236 static int __init init(void)
238 return usb_composite_register(&cdc_driver);
242 static void __exit cleanup(void)
244 usb_composite_unregister(&cdc_driver);
246 module_exit(cleanup);