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 /*-------------------------------------------------------------------------*/
47 * Kbuild is not very cooperative with respect to linking separately
48 * compiled library objects into one module. So for now we won't use
49 * separate compilation ... ensuring init/exit sections work to shrink
50 * the runtime footprint, and giving us at least some parts of what
51 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
54 #include "composite.c"
55 #include "usbstring.c"
57 #include "epautoconf.c"
63 /*-------------------------------------------------------------------------*/
65 static struct usb_device_descriptor device_desc = {
66 .bLength = sizeof device_desc,
67 .bDescriptorType = USB_DT_DEVICE,
69 .bcdUSB = __constant_cpu_to_le16(0x0200),
71 .bDeviceClass = USB_CLASS_COMM,
74 /* .bMaxPacketSize0 = f(hardware) */
76 /* Vendor and product id can be overridden by module parameters. */
77 .idVendor = __constant_cpu_to_le16(CDC_VENDOR_NUM),
78 .idProduct = __constant_cpu_to_le16(CDC_PRODUCT_NUM),
79 /* .bcdDevice = f(hardware) */
80 /* .iManufacturer = DYNAMIC */
81 /* .iProduct = DYNAMIC */
82 /* NO SERIAL NUMBER */
83 .bNumConfigurations = 1,
86 static struct usb_otg_descriptor otg_descriptor = {
87 .bLength = sizeof otg_descriptor,
88 .bDescriptorType = USB_DT_OTG,
90 /* REVISIT SRP-only hardware is possible, although
91 * it would not be called "OTG" ...
93 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
96 static const struct usb_descriptor_header *otg_desc[] = {
97 (struct usb_descriptor_header *) &otg_descriptor,
102 /* string IDs are assigned dynamically */
104 #define STRING_MANUFACTURER_IDX 0
105 #define STRING_PRODUCT_IDX 1
107 static char manufacturer[50];
109 static struct usb_string strings_dev[] = {
110 [STRING_MANUFACTURER_IDX].s = manufacturer,
111 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
112 { } /* end of list */
115 static struct usb_gadget_strings stringtab_dev = {
116 .language = 0x0409, /* en-us */
117 .strings = strings_dev,
120 static struct usb_gadget_strings *dev_strings[] = {
125 static u8 hostaddr[ETH_ALEN];
127 /*-------------------------------------------------------------------------*/
130 * We _always_ have both CDC ECM and CDC ACM functions.
132 static int __init cdc_do_config(struct usb_configuration *c)
136 if (gadget_is_otg(c->cdev->gadget)) {
137 c->descriptors = otg_desc;
138 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
141 status = ecm_bind_config(c, hostaddr);
145 status = acm_bind_config(c, 0);
152 static struct usb_configuration cdc_config_driver = {
153 .label = "CDC Composite (ECM + ACM)",
154 .bind = cdc_do_config,
155 .bConfigurationValue = 1,
156 /* .iConfiguration = DYNAMIC */
157 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
160 /*-------------------------------------------------------------------------*/
162 static int __init cdc_bind(struct usb_composite_dev *cdev)
165 struct usb_gadget *gadget = cdev->gadget;
168 if (!can_support_ecm(cdev->gadget)) {
169 dev_err(&gadget->dev, "controller '%s' not usable\n",
174 /* set up network link layer */
175 status = gether_setup(cdev->gadget, hostaddr);
179 /* set up serial link layer */
180 status = gserial_setup(cdev->gadget, 1);
184 gcnum = usb_gadget_controller_number(gadget);
186 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
188 /* We assume that can_support_ecm() tells the truth;
189 * but if the controller isn't recognized at all then
190 * that assumption is a bit more likely to be wrong.
192 WARNING(cdev, "controller '%s' not recognized; trying %s\n",
194 cdc_config_driver.label);
195 device_desc.bcdDevice =
196 __constant_cpu_to_le16(0x0300 | 0x0099);
200 /* Allocate string descriptor numbers ... note that string
201 * contents can be overridden by the composite_dev glue.
204 /* device descriptor strings: manufacturer, product */
205 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
206 init_utsname()->sysname, init_utsname()->release,
208 status = usb_string_id(cdev);
211 strings_dev[STRING_MANUFACTURER_IDX].id = status;
212 device_desc.iManufacturer = status;
214 status = usb_string_id(cdev);
217 strings_dev[STRING_PRODUCT_IDX].id = status;
218 device_desc.iProduct = status;
220 /* register our configuration */
221 status = usb_add_config(cdev, &cdc_config_driver);
225 dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
237 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
244 static struct usb_composite_driver cdc_driver = {
247 .strings = dev_strings,
249 .unbind = __exit_p(cdc_unbind),
252 MODULE_DESCRIPTION(DRIVER_DESC);
253 MODULE_AUTHOR("David Brownell");
254 MODULE_LICENSE("GPL");
256 static int __init init(void)
258 return usb_composite_register(&cdc_driver);
262 static void __exit cleanup(void)
264 usb_composite_unregister(&cdc_driver);
266 module_exit(cleanup);