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1/*
2 * audio.c -- Audio gadget driver
3 *
4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
5 * Copyright (C) 2008 Analog Devices, Inc
6 *
7 * Enter bugs at http://blackfin.uclinux.org/
8 *
9 * Licensed under the GPL-2 or later.
10 */
11
12/* #define VERBOSE_DEBUG */
13
14#include <linux/kernel.h>
15#include <linux/utsname.h>
16
17#include "u_audio.h"
18
19#define DRIVER_DESC "Linux USB Audio Gadget"
20#define DRIVER_VERSION "Dec 18, 2008"
21
22/*-------------------------------------------------------------------------*/
23
24/*
25 * Kbuild is not very cooperative with respect to linking separately
26 * compiled library objects into one module. So for now we won't use
27 * separate compilation ... ensuring init/exit sections work to shrink
28 * the runtime footprint, and giving us at least some parts of what
29 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
30 */
31#include "composite.c"
32#include "usbstring.c"
33#include "config.c"
34#include "epautoconf.c"
35
36#include "u_audio.c"
37#include "f_audio.c"
38
39/*-------------------------------------------------------------------------*/
40
41/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
42 * Instead: allocate your own, using normal USB-IF procedures.
43 */
44
45/* Thanks to Linux Foundation for donating this product ID. */
46#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */
47#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */
48
49/*-------------------------------------------------------------------------*/
50
51static struct usb_device_descriptor device_desc = {
52 .bLength = sizeof device_desc,
53 .bDescriptorType = USB_DT_DEVICE,
54
55 .bcdUSB = __constant_cpu_to_le16(0x200),
56
57 .bDeviceClass = USB_CLASS_PER_INTERFACE,
58 .bDeviceSubClass = 0,
59 .bDeviceProtocol = 0,
60 /* .bMaxPacketSize0 = f(hardware) */
61
62 /* Vendor and product id defaults change according to what configs
63 * we support. (As does bNumConfigurations.) These values can
64 * also be overridden by module parameters.
65 */
66 .idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
67 .idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
68 /* .bcdDevice = f(hardware) */
69 /* .iManufacturer = DYNAMIC */
70 /* .iProduct = DYNAMIC */
71 /* NO SERIAL NUMBER */
72 .bNumConfigurations = 1,
73};
74
75static struct usb_otg_descriptor otg_descriptor = {
76 .bLength = sizeof otg_descriptor,
77 .bDescriptorType = USB_DT_OTG,
78
79 /* REVISIT SRP-only hardware is possible, although
80 * it would not be called "OTG" ...
81 */
82 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
83};
84
85static const struct usb_descriptor_header *otg_desc[] = {
86 (struct usb_descriptor_header *) &otg_descriptor,
87 NULL,
88};
89
90/*-------------------------------------------------------------------------*/
91
92static int __init audio_do_config(struct usb_configuration *c)
93{
94 /* FIXME alloc iConfiguration string, set it in c->strings */
95
96 if (gadget_is_otg(c->cdev->gadget)) {
97 c->descriptors = otg_desc;
98 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
99 }
100
101 audio_bind_config(c);
102
103 return 0;
104}
105
106static struct usb_configuration audio_config_driver = {
107 .label = DRIVER_DESC,
108 .bConfigurationValue = 1,
109 /* .iConfiguration = DYNAMIC */
110 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
111};
112
113/*-------------------------------------------------------------------------*/
114
115static int __init audio_bind(struct usb_composite_dev *cdev)
116{
117 int gcnum;
118 int status;
119
120 gcnum = usb_gadget_controller_number(cdev->gadget);
121 if (gcnum >= 0)
122 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
123 else {
124 ERROR(cdev, "controller '%s' not recognized; trying %s\n",
125 cdev->gadget->name,
126 audio_config_driver.label);
127 device_desc.bcdDevice =
128 __constant_cpu_to_le16(0x0300 | 0x0099);
129 }
130
131 /* device descriptor strings: manufacturer, product */
132 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
133 init_utsname()->sysname, init_utsname()->release,
134 cdev->gadget->name);
135 status = usb_string_id(cdev);
136 if (status < 0)
137 goto fail;
138 strings_dev[STRING_MANUFACTURER_IDX].id = status;
139 device_desc.iManufacturer = status;
140
141 status = usb_string_id(cdev);
142 if (status < 0)
143 goto fail;
144 strings_dev[STRING_PRODUCT_IDX].id = status;
145 device_desc.iProduct = status;
146
147 status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
148 if (status < 0)
149 goto fail;
150
151 INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
152 return 0;
153
154fail:
155 return status;
156}
157
158static int __exit audio_unbind(struct usb_composite_dev *cdev)
159{
160 gaudio_cleanup();
161 return 0;
162}
163
164static struct usb_composite_driver audio_driver = {
165 .name = "g_audio",
166 .dev = &device_desc,
167 .strings = audio_strings,
168 .max_speed = USB_SPEED_HIGH,
169 .unbind = __exit_p(audio_unbind),
170};
171
172static int __init init(void)
173{
174 return usb_composite_probe(&audio_driver, audio_bind);
175}
176module_init(init);
177
178static void __exit cleanup(void)
179{
180 usb_composite_unregister(&audio_driver);
181}
182module_exit(cleanup);
183
184MODULE_DESCRIPTION(DRIVER_DESC);
185MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
186MODULE_LICENSE("GPL");
187
1/*
2 * audio.c -- Audio gadget driver
3 *
4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
5 * Copyright (C) 2008 Analog Devices, Inc
6 *
7 * Enter bugs at http://blackfin.uclinux.org/
8 *
9 * Licensed under the GPL-2 or later.
10 */
11
12/* #define VERBOSE_DEBUG */
13
14#include <linux/kernel.h>
15#include <linux/utsname.h>
16
17#define DRIVER_DESC "Linux USB Audio Gadget"
18#define DRIVER_VERSION "Feb 2, 2012"
19
20/*-------------------------------------------------------------------------*/
21
22/*
23 * Kbuild is not very cooperative with respect to linking separately
24 * compiled library objects into one module. So for now we won't use
25 * separate compilation ... ensuring init/exit sections work to shrink
26 * the runtime footprint, and giving us at least some parts of what
27 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
28 */
29#include "composite.c"
30#include "usbstring.c"
31#include "config.c"
32#include "epautoconf.c"
33
34/* string IDs are assigned dynamically */
35
36#define STRING_MANUFACTURER_IDX 0
37#define STRING_PRODUCT_IDX 1
38
39static char manufacturer[50];
40
41static struct usb_string strings_dev[] = {
42 [STRING_MANUFACTURER_IDX].s = manufacturer,
43 [STRING_PRODUCT_IDX].s = DRIVER_DESC,
44 { } /* end of list */
45};
46
47static struct usb_gadget_strings stringtab_dev = {
48 .language = 0x0409, /* en-us */
49 .strings = strings_dev,
50};
51
52static struct usb_gadget_strings *audio_strings[] = {
53 &stringtab_dev,
54 NULL,
55};
56
57#ifdef CONFIG_GADGET_UAC1
58#include "u_uac1.h"
59#include "u_uac1.c"
60#include "f_uac1.c"
61#else
62#include "f_uac2.c"
63#endif
64
65/*-------------------------------------------------------------------------*/
66
67/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
68 * Instead: allocate your own, using normal USB-IF procedures.
69 */
70
71/* Thanks to Linux Foundation for donating this product ID. */
72#define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */
73#define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */
74
75/*-------------------------------------------------------------------------*/
76
77static struct usb_device_descriptor device_desc = {
78 .bLength = sizeof device_desc,
79 .bDescriptorType = USB_DT_DEVICE,
80
81 .bcdUSB = __constant_cpu_to_le16(0x200),
82
83#ifdef CONFIG_GADGET_UAC1
84 .bDeviceClass = USB_CLASS_PER_INTERFACE,
85 .bDeviceSubClass = 0,
86 .bDeviceProtocol = 0,
87#else
88 .bDeviceClass = USB_CLASS_MISC,
89 .bDeviceSubClass = 0x02,
90 .bDeviceProtocol = 0x01,
91#endif
92 /* .bMaxPacketSize0 = f(hardware) */
93
94 /* Vendor and product id defaults change according to what configs
95 * we support. (As does bNumConfigurations.) These values can
96 * also be overridden by module parameters.
97 */
98 .idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
99 .idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
100 /* .bcdDevice = f(hardware) */
101 /* .iManufacturer = DYNAMIC */
102 /* .iProduct = DYNAMIC */
103 /* NO SERIAL NUMBER */
104 .bNumConfigurations = 1,
105};
106
107static struct usb_otg_descriptor otg_descriptor = {
108 .bLength = sizeof otg_descriptor,
109 .bDescriptorType = USB_DT_OTG,
110
111 /* REVISIT SRP-only hardware is possible, although
112 * it would not be called "OTG" ...
113 */
114 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
115};
116
117static const struct usb_descriptor_header *otg_desc[] = {
118 (struct usb_descriptor_header *) &otg_descriptor,
119 NULL,
120};
121
122/*-------------------------------------------------------------------------*/
123
124static int __init audio_do_config(struct usb_configuration *c)
125{
126 /* FIXME alloc iConfiguration string, set it in c->strings */
127
128 if (gadget_is_otg(c->cdev->gadget)) {
129 c->descriptors = otg_desc;
130 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
131 }
132
133 audio_bind_config(c);
134
135 return 0;
136}
137
138static struct usb_configuration audio_config_driver = {
139 .label = DRIVER_DESC,
140 .bConfigurationValue = 1,
141 /* .iConfiguration = DYNAMIC */
142 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
143#ifndef CONFIG_GADGET_UAC1
144 .unbind = uac2_unbind_config,
145#endif
146};
147
148/*-------------------------------------------------------------------------*/
149
150static int __init audio_bind(struct usb_composite_dev *cdev)
151{
152 int gcnum;
153 int status;
154
155 gcnum = usb_gadget_controller_number(cdev->gadget);
156 if (gcnum >= 0)
157 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
158 else {
159 ERROR(cdev, "controller '%s' not recognized; trying %s\n",
160 cdev->gadget->name,
161 audio_config_driver.label);
162 device_desc.bcdDevice =
163 __constant_cpu_to_le16(0x0300 | 0x0099);
164 }
165
166 /* device descriptor strings: manufacturer, product */
167 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
168 init_utsname()->sysname, init_utsname()->release,
169 cdev->gadget->name);
170 status = usb_string_id(cdev);
171 if (status < 0)
172 goto fail;
173 strings_dev[STRING_MANUFACTURER_IDX].id = status;
174 device_desc.iManufacturer = status;
175
176 status = usb_string_id(cdev);
177 if (status < 0)
178 goto fail;
179 strings_dev[STRING_PRODUCT_IDX].id = status;
180 device_desc.iProduct = status;
181
182 status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
183 if (status < 0)
184 goto fail;
185
186 INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
187 return 0;
188
189fail:
190 return status;
191}
192
193static int __exit audio_unbind(struct usb_composite_dev *cdev)
194{
195#ifdef CONFIG_GADGET_UAC1
196 gaudio_cleanup();
197#endif
198 return 0;
199}
200
201static struct usb_composite_driver audio_driver = {
202 .name = "g_audio",
203 .dev = &device_desc,
204 .strings = audio_strings,
205 .max_speed = USB_SPEED_HIGH,
206 .unbind = __exit_p(audio_unbind),
207};
208
209static int __init init(void)
210{
211 return usb_composite_probe(&audio_driver, audio_bind);
212}
213module_init(init);
214
215static void __exit cleanup(void)
216{
217 usb_composite_unregister(&audio_driver);
218}
219module_exit(cleanup);
220
221MODULE_DESCRIPTION(DRIVER_DESC);
222MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
223MODULE_LICENSE("GPL");
224