summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/legacy/audio.c
blob: f289caf18a45341dc613a676345bfe8eeb51ee8e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/*
 * audio.c -- Audio gadget driver
 *
 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
 * Copyright (C) 2008 Analog Devices, Inc
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 */

/* #define VERBOSE_DEBUG */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/composite.h>

#include "gadget_chips.h"
#define DRIVER_DESC		"Linux USB Audio Gadget"
#define DRIVER_VERSION		"Feb 2, 2012"

USB_GADGET_COMPOSITE_OPTIONS();

#ifndef CONFIG_GADGET_UAC1
#include "u_uac2.h"

/* Playback(USB-IN) Default Stereo - Fl/Fr */
static int p_chmask = UAC2_DEF_PCHMASK;
module_param(p_chmask, uint, S_IRUGO);
MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");

/* Playback Default 48 KHz */
static int p_srate = UAC2_DEF_PSRATE;
module_param(p_srate, uint, S_IRUGO);
MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");

/* Playback Default 16bits/sample */
static int p_ssize = UAC2_DEF_PSSIZE;
module_param(p_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");

/* Capture(USB-OUT) Default Stereo - Fl/Fr */
static int c_chmask = UAC2_DEF_CCHMASK;
module_param(c_chmask, uint, S_IRUGO);
MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");

/* Capture Default 64 KHz */
static int c_srate = UAC2_DEF_CSRATE;
module_param(c_srate, uint, S_IRUGO);
MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");

/* Capture Default 16bits/sample */
static int c_ssize = UAC2_DEF_CSSIZE;
module_param(c_ssize, uint, S_IRUGO);
MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
#else
#include "u_uac1.h"

static char *fn_play = FILE_PCM_PLAYBACK;
module_param(fn_play, charp, S_IRUGO);
MODULE_PARM_DESC(fn_play, "Playback PCM device file name");

static char *fn_cap = FILE_PCM_CAPTURE;
module_param(fn_cap, charp, S_IRUGO);
MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");

static char *fn_cntl = FILE_CONTROL;
module_param(fn_cntl, charp, S_IRUGO);
MODULE_PARM_DESC(fn_cntl, "Control device file name");

static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
module_param(req_buf_size, int, S_IRUGO);
MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");

static int req_count = UAC1_REQ_COUNT;
module_param(req_count, int, S_IRUGO);
MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");

static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
module_param(audio_buf_size, int, S_IRUGO);
MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
#endif

/* string IDs are assigned dynamically */

static struct usb_string strings_dev[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = "",
	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
	[USB_GADGET_SERIAL_IDX].s = "",
	{  } /* end of list */
};

static struct usb_gadget_strings stringtab_dev = {
	.language = 0x0409,	/* en-us */
	.strings = strings_dev,
};

static struct usb_gadget_strings *audio_strings[] = {
	&stringtab_dev,
	NULL,
};

#ifndef CONFIG_GADGET_UAC1
static struct usb_function_instance *fi_uac2;
static struct usb_function *f_uac2;
#else
static struct usb_function_instance *fi_uac1;
static struct usb_function *f_uac1;
#endif

/*-------------------------------------------------------------------------*/

/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */

/* Thanks to Linux Foundation for donating this product ID. */
#define AUDIO_VENDOR_NUM		0x1d6b	/* Linux Foundation */
#define AUDIO_PRODUCT_NUM		0x0101	/* Linux-USB Audio Gadget */

/*-------------------------------------------------------------------------*/

static struct usb_device_descriptor device_desc = {
	.bLength =		sizeof device_desc,
	.bDescriptorType =	USB_DT_DEVICE,

	.bcdUSB =		__constant_cpu_to_le16(0x200),

#ifdef CONFIG_GADGET_UAC1
	.bDeviceClass =		USB_CLASS_PER_INTERFACE,
	.bDeviceSubClass =	0,
	.bDeviceProtocol =	0,
#else
	.bDeviceClass =		USB_CLASS_MISC,
	.bDeviceSubClass =	0x02,
	.bDeviceProtocol =	0x01,
#endif
	/* .bMaxPacketSize0 = f(hardware) */

	/* Vendor and product id defaults change according to what configs
	 * we support.  (As does bNumConfigurations.)  These values can
	 * also be overridden by module parameters.
	 */
	.idVendor =		__constant_cpu_to_le16(AUDIO_VENDOR_NUM),
	.idProduct =		__constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
	/* .bcdDevice = f(hardware) */
	/* .iManufacturer = DYNAMIC */
	/* .iProduct = DYNAMIC */
	/* NO SERIAL NUMBER */
	.bNumConfigurations =	1,
};

static struct usb_otg_descriptor otg_descriptor = {
	.bLength =		sizeof otg_descriptor,
	.bDescriptorType =	USB_DT_OTG,

	/* REVISIT SRP-only hardware is possible, although
	 * it would not be called "OTG" ...
	 */
	.bmAttributes =		USB_OTG_SRP | USB_OTG_HNP,
};

static const struct usb_descriptor_header *otg_desc[] = {
	(struct usb_descriptor_header *) &otg_descriptor,
	NULL,
};

/*-------------------------------------------------------------------------*/

static int audio_do_config(struct usb_configuration *c)
{
	int status;

	/* FIXME alloc iConfiguration string, set it in c->strings */

	if (gadget_is_otg(c->cdev->gadget)) {
		c->descriptors = otg_desc;
		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

#ifdef CONFIG_GADGET_UAC1
	f_uac1 = usb_get_function(fi_uac1);
	if (IS_ERR(f_uac1)) {
		status = PTR_ERR(f_uac1);
		return status;
	}

	status = usb_add_function(c, f_uac1);
	if (status < 0) {
		usb_put_function(f_uac1);
		return status;
	}
#else
	f_uac2 = usb_get_function(fi_uac2);
	if (IS_ERR(f_uac2)) {
		status = PTR_ERR(f_uac2);
		return status;
	}

	status = usb_add_function(c, f_uac2);
	if (status < 0) {
		usb_put_function(f_uac2);
		return status;
	}
#endif

	return 0;
}

static struct usb_configuration audio_config_driver = {
	.label			= DRIVER_DESC,
	.bConfigurationValue	= 1,
	/* .iConfiguration = DYNAMIC */
	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
};

/*-------------------------------------------------------------------------*/

static int audio_bind(struct usb_composite_dev *cdev)
{
#ifndef CONFIG_GADGET_UAC1
	struct f_uac2_opts	*uac2_opts;
#else
	struct f_uac1_opts	*uac1_opts;
#endif
	int			status;

#ifndef CONFIG_GADGET_UAC1
	fi_uac2 = usb_get_function_instance("uac2");
	if (IS_ERR(fi_uac2))
		return PTR_ERR(fi_uac2);
#else
	fi_uac1 = usb_get_function_instance("uac1");
	if (IS_ERR(fi_uac1))
		return PTR_ERR(fi_uac1);
#endif

#ifndef CONFIG_GADGET_UAC1
	uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
	uac2_opts->p_chmask = p_chmask;
	uac2_opts->p_srate = p_srate;
	uac2_opts->p_ssize = p_ssize;
	uac2_opts->c_chmask = c_chmask;
	uac2_opts->c_srate = c_srate;
	uac2_opts->c_ssize = c_ssize;
#else
	uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
	uac1_opts->fn_play = fn_play;
	uac1_opts->fn_cap = fn_cap;
	uac1_opts->fn_cntl = fn_cntl;
	uac1_opts->req_buf_size = req_buf_size;
	uac1_opts->req_count = req_count;
	uac1_opts->audio_buf_size = audio_buf_size;
#endif

	status = usb_string_ids_tab(cdev, strings_dev);
	if (status < 0)
		goto fail;
	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;

	status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
	if (status < 0)
		goto fail;
	usb_composite_overwrite_options(cdev, &coverwrite);

	INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
	return 0;

fail:
#ifndef CONFIG_GADGET_UAC1
	usb_put_function_instance(fi_uac2);
#else
	usb_put_function_instance(fi_uac1);
#endif
	return status;
}

static int audio_unbind(struct usb_composite_dev *cdev)
{
#ifdef CONFIG_GADGET_UAC1
	if (!IS_ERR_OR_NULL(f_uac1))
		usb_put_function(f_uac1);
	if (!IS_ERR_OR_NULL(fi_uac1))
		usb_put_function_instance(fi_uac1);
#else
	if (!IS_ERR_OR_NULL(f_uac2))
		usb_put_function(f_uac2);
	if (!IS_ERR_OR_NULL(fi_uac2))
		usb_put_function_instance(fi_uac2);
#endif
	return 0;
}

static struct usb_composite_driver audio_driver = {
	.name		= "g_audio",
	.dev		= &device_desc,
	.strings	= audio_strings,
	.max_speed	= USB_SPEED_HIGH,
	.bind		= audio_bind,
	.unbind		= audio_unbind,
};

module_usb_composite_driver(audio_driver);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
MODULE_LICENSE("GPL");