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[~andy/linux] / drivers / usb / gadget / ncm.c
1 /*
2  * ncm.c -- NCM gadget driver
3  *
4  * Copyright (C) 2010 Nokia Corporation
5  * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
6  *
7  * The driver borrows from ether.c which is:
8  *
9  * Copyright (C) 2003-2005,2008 David Brownell
10  * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
11  * Copyright (C) 2008 Nokia Corporation
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  */
18
19 /* #define DEBUG */
20 /* #define VERBOSE_DEBUG */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/usb/composite.h>
25
26 #include "u_ether.h"
27
28 #define DRIVER_DESC             "NCM Gadget"
29
30 /*-------------------------------------------------------------------------*/
31
32 /*
33  * Kbuild is not very cooperative with respect to linking separately
34  * compiled library objects into one module.  So for now we won't use
35  * separate compilation ... ensuring init/exit sections work to shrink
36  * the runtime footprint, and giving us at least some parts of what
37  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
38  */
39 #include "f_ncm.c"
40 #include "u_ether.c"
41
42 /*-------------------------------------------------------------------------*/
43
44 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
45  * Instead:  allocate your own, using normal USB-IF procedures.
46  */
47
48 /* Thanks to NetChip Technologies for donating this product ID.
49  * It's for devices with only CDC Ethernet configurations.
50  */
51 #define CDC_VENDOR_NUM          0x0525  /* NetChip */
52 #define CDC_PRODUCT_NUM         0xa4a1  /* Linux-USB Ethernet Gadget */
53
54 /*-------------------------------------------------------------------------*/
55 USB_GADGET_COMPOSITE_OPTIONS();
56
57 static struct usb_device_descriptor device_desc = {
58         .bLength =              sizeof device_desc,
59         .bDescriptorType =      USB_DT_DEVICE,
60
61         .bcdUSB =               cpu_to_le16 (0x0200),
62
63         .bDeviceClass =         USB_CLASS_COMM,
64         .bDeviceSubClass =      0,
65         .bDeviceProtocol =      0,
66         /* .bMaxPacketSize0 = f(hardware) */
67
68         /* Vendor and product id defaults change according to what configs
69          * we support.  (As does bNumConfigurations.)  These values can
70          * also be overridden by module parameters.
71          */
72         .idVendor =             cpu_to_le16 (CDC_VENDOR_NUM),
73         .idProduct =            cpu_to_le16 (CDC_PRODUCT_NUM),
74         /* .bcdDevice = f(hardware) */
75         /* .iManufacturer = DYNAMIC */
76         /* .iProduct = DYNAMIC */
77         /* NO SERIAL NUMBER */
78         .bNumConfigurations =   1,
79 };
80
81 static struct usb_otg_descriptor otg_descriptor = {
82         .bLength =              sizeof otg_descriptor,
83         .bDescriptorType =      USB_DT_OTG,
84
85         /* REVISIT SRP-only hardware is possible, although
86          * it would not be called "OTG" ...
87          */
88         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
89 };
90
91 static const struct usb_descriptor_header *otg_desc[] = {
92         (struct usb_descriptor_header *) &otg_descriptor,
93         NULL,
94 };
95
96 /* string IDs are assigned dynamically */
97 static struct usb_string strings_dev[] = {
98         [USB_GADGET_MANUFACTURER_IDX].s = "",
99         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
100         [USB_GADGET_SERIAL_IDX].s = "",
101         {  } /* end of list */
102 };
103
104 static struct usb_gadget_strings stringtab_dev = {
105         .language       = 0x0409,       /* en-us */
106         .strings        = strings_dev,
107 };
108
109 static struct usb_gadget_strings *dev_strings[] = {
110         &stringtab_dev,
111         NULL,
112 };
113
114 struct eth_dev *the_dev;
115 static u8 hostaddr[ETH_ALEN];
116
117 /*-------------------------------------------------------------------------*/
118
119 static int __init ncm_do_config(struct usb_configuration *c)
120 {
121         /* FIXME alloc iConfiguration string, set it in c->strings */
122
123         if (gadget_is_otg(c->cdev->gadget)) {
124                 c->descriptors = otg_desc;
125                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
126         }
127
128         return ncm_bind_config(c, hostaddr, the_dev);
129 }
130
131 static struct usb_configuration ncm_config_driver = {
132         /* .label = f(hardware) */
133         .label                  = "CDC Ethernet (NCM)",
134         .bConfigurationValue    = 1,
135         /* .iConfiguration = DYNAMIC */
136         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
137 };
138
139 /*-------------------------------------------------------------------------*/
140
141 static int __init gncm_bind(struct usb_composite_dev *cdev)
142 {
143         struct usb_gadget       *gadget = cdev->gadget;
144         int                     status;
145
146         /* set up network link layer */
147         the_dev = gether_setup(cdev->gadget, hostaddr);
148         if (IS_ERR(the_dev))
149                 return PTR_ERR(the_dev);
150
151         /* Allocate string descriptor numbers ... note that string
152          * contents can be overridden by the composite_dev glue.
153          */
154
155         status = usb_string_ids_tab(cdev, strings_dev);
156         if (status < 0)
157                 goto fail;
158         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
159         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
160
161         status = usb_add_config(cdev, &ncm_config_driver,
162                                 ncm_do_config);
163         if (status < 0)
164                 goto fail;
165
166         usb_composite_overwrite_options(cdev, &coverwrite);
167         dev_info(&gadget->dev, "%s\n", DRIVER_DESC);
168
169         return 0;
170
171 fail:
172         gether_cleanup(the_dev);
173         return status;
174 }
175
176 static int __exit gncm_unbind(struct usb_composite_dev *cdev)
177 {
178         gether_cleanup(the_dev);
179         return 0;
180 }
181
182 static __refdata struct usb_composite_driver ncm_driver = {
183         .name           = "g_ncm",
184         .dev            = &device_desc,
185         .strings        = dev_strings,
186         .max_speed      = USB_SPEED_HIGH,
187         .bind           = gncm_bind,
188         .unbind         = __exit_p(gncm_unbind),
189 };
190
191 MODULE_DESCRIPTION(DRIVER_DESC);
192 MODULE_AUTHOR("Yauheni Kaliuta");
193 MODULE_LICENSE("GPL");
194
195 static int __init init(void)
196 {
197         return usb_composite_probe(&ncm_driver);
198 }
199 module_init(init);
200
201 static void __exit cleanup(void)
202 {
203         usb_composite_unregister(&ncm_driver);
204 }
205 module_exit(cleanup);