Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
[firefly-linux-kernel-4.4.55.git] / drivers / usb / gadget / legacy / audio.c
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/module.h>
16 #include <linux/usb/composite.h>
17
18 #define DRIVER_DESC             "Linux USB Audio Gadget"
19 #define DRIVER_VERSION          "Feb 2, 2012"
20
21 USB_GADGET_COMPOSITE_OPTIONS();
22
23 #ifndef CONFIG_GADGET_UAC1
24 #include "u_uac2.h"
25
26 /* Playback(USB-IN) Default Stereo - Fl/Fr */
27 static int p_chmask = UAC2_DEF_PCHMASK;
28 module_param(p_chmask, uint, S_IRUGO);
29 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
30
31 /* Playback Default 48 KHz */
32 static int p_srate = UAC2_DEF_PSRATE;
33 module_param(p_srate, uint, S_IRUGO);
34 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
35
36 /* Playback Default 16bits/sample */
37 static int p_ssize = UAC2_DEF_PSSIZE;
38 module_param(p_ssize, uint, S_IRUGO);
39 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
40
41 /* Capture(USB-OUT) Default Stereo - Fl/Fr */
42 static int c_chmask = UAC2_DEF_CCHMASK;
43 module_param(c_chmask, uint, S_IRUGO);
44 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
45
46 /* Capture Default 64 KHz */
47 static int c_srate = UAC2_DEF_CSRATE;
48 module_param(c_srate, uint, S_IRUGO);
49 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
50
51 /* Capture Default 16bits/sample */
52 static int c_ssize = UAC2_DEF_CSSIZE;
53 module_param(c_ssize, uint, S_IRUGO);
54 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
55 #else
56 #include "u_uac1.h"
57
58 static char *fn_play = FILE_PCM_PLAYBACK;
59 module_param(fn_play, charp, S_IRUGO);
60 MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
61
62 static char *fn_cap = FILE_PCM_CAPTURE;
63 module_param(fn_cap, charp, S_IRUGO);
64 MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
65
66 static char *fn_cntl = FILE_CONTROL;
67 module_param(fn_cntl, charp, S_IRUGO);
68 MODULE_PARM_DESC(fn_cntl, "Control device file name");
69
70 static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
71 module_param(req_buf_size, int, S_IRUGO);
72 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
73
74 static int req_count = UAC1_REQ_COUNT;
75 module_param(req_count, int, S_IRUGO);
76 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
77
78 static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
79 module_param(audio_buf_size, int, S_IRUGO);
80 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
81 #endif
82
83 /* string IDs are assigned dynamically */
84
85 static struct usb_string strings_dev[] = {
86         [USB_GADGET_MANUFACTURER_IDX].s = "",
87         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
88         [USB_GADGET_SERIAL_IDX].s = "",
89         {  } /* end of list */
90 };
91
92 static struct usb_gadget_strings stringtab_dev = {
93         .language = 0x0409,     /* en-us */
94         .strings = strings_dev,
95 };
96
97 static struct usb_gadget_strings *audio_strings[] = {
98         &stringtab_dev,
99         NULL,
100 };
101
102 #ifndef CONFIG_GADGET_UAC1
103 static struct usb_function_instance *fi_uac2;
104 static struct usb_function *f_uac2;
105 #else
106 static struct usb_function_instance *fi_uac1;
107 static struct usb_function *f_uac1;
108 #endif
109
110 /*-------------------------------------------------------------------------*/
111
112 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
113  * Instead:  allocate your own, using normal USB-IF procedures.
114  */
115
116 /* Thanks to Linux Foundation for donating this product ID. */
117 #define AUDIO_VENDOR_NUM                0x1d6b  /* Linux Foundation */
118 #define AUDIO_PRODUCT_NUM               0x0101  /* Linux-USB Audio Gadget */
119
120 /*-------------------------------------------------------------------------*/
121
122 static struct usb_device_descriptor device_desc = {
123         .bLength =              sizeof device_desc,
124         .bDescriptorType =      USB_DT_DEVICE,
125
126         .bcdUSB =               cpu_to_le16(0x200),
127
128 #ifdef CONFIG_GADGET_UAC1
129         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
130         .bDeviceSubClass =      0,
131         .bDeviceProtocol =      0,
132 #else
133         .bDeviceClass =         USB_CLASS_MISC,
134         .bDeviceSubClass =      0x02,
135         .bDeviceProtocol =      0x01,
136 #endif
137         /* .bMaxPacketSize0 = f(hardware) */
138
139         /* Vendor and product id defaults change according to what configs
140          * we support.  (As does bNumConfigurations.)  These values can
141          * also be overridden by module parameters.
142          */
143         .idVendor =             cpu_to_le16(AUDIO_VENDOR_NUM),
144         .idProduct =            cpu_to_le16(AUDIO_PRODUCT_NUM),
145         /* .bcdDevice = f(hardware) */
146         /* .iManufacturer = DYNAMIC */
147         /* .iProduct = DYNAMIC */
148         /* NO SERIAL NUMBER */
149         .bNumConfigurations =   1,
150 };
151
152 static const struct usb_descriptor_header *otg_desc[2];
153
154 /*-------------------------------------------------------------------------*/
155
156 static int audio_do_config(struct usb_configuration *c)
157 {
158         int status;
159
160         /* FIXME alloc iConfiguration string, set it in c->strings */
161
162         if (gadget_is_otg(c->cdev->gadget)) {
163                 c->descriptors = otg_desc;
164                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
165         }
166
167 #ifdef CONFIG_GADGET_UAC1
168         f_uac1 = usb_get_function(fi_uac1);
169         if (IS_ERR(f_uac1)) {
170                 status = PTR_ERR(f_uac1);
171                 return status;
172         }
173
174         status = usb_add_function(c, f_uac1);
175         if (status < 0) {
176                 usb_put_function(f_uac1);
177                 return status;
178         }
179 #else
180         f_uac2 = usb_get_function(fi_uac2);
181         if (IS_ERR(f_uac2)) {
182                 status = PTR_ERR(f_uac2);
183                 return status;
184         }
185
186         status = usb_add_function(c, f_uac2);
187         if (status < 0) {
188                 usb_put_function(f_uac2);
189                 return status;
190         }
191 #endif
192
193         return 0;
194 }
195
196 static struct usb_configuration audio_config_driver = {
197         .label                  = DRIVER_DESC,
198         .bConfigurationValue    = 1,
199         /* .iConfiguration = DYNAMIC */
200         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
201 };
202
203 /*-------------------------------------------------------------------------*/
204
205 static int audio_bind(struct usb_composite_dev *cdev)
206 {
207 #ifndef CONFIG_GADGET_UAC1
208         struct f_uac2_opts      *uac2_opts;
209 #else
210         struct f_uac1_opts      *uac1_opts;
211 #endif
212         int                     status;
213
214 #ifndef CONFIG_GADGET_UAC1
215         fi_uac2 = usb_get_function_instance("uac2");
216         if (IS_ERR(fi_uac2))
217                 return PTR_ERR(fi_uac2);
218 #else
219         fi_uac1 = usb_get_function_instance("uac1");
220         if (IS_ERR(fi_uac1))
221                 return PTR_ERR(fi_uac1);
222 #endif
223
224 #ifndef CONFIG_GADGET_UAC1
225         uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
226         uac2_opts->p_chmask = p_chmask;
227         uac2_opts->p_srate = p_srate;
228         uac2_opts->p_ssize = p_ssize;
229         uac2_opts->c_chmask = c_chmask;
230         uac2_opts->c_srate = c_srate;
231         uac2_opts->c_ssize = c_ssize;
232 #else
233         uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
234         uac1_opts->fn_play = fn_play;
235         uac1_opts->fn_cap = fn_cap;
236         uac1_opts->fn_cntl = fn_cntl;
237         uac1_opts->req_buf_size = req_buf_size;
238         uac1_opts->req_count = req_count;
239         uac1_opts->audio_buf_size = audio_buf_size;
240 #endif
241
242         status = usb_string_ids_tab(cdev, strings_dev);
243         if (status < 0)
244                 goto fail;
245         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
246         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
247
248         if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
249                 struct usb_descriptor_header *usb_desc;
250
251                 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
252                 if (!usb_desc)
253                         goto fail;
254                 usb_otg_descriptor_init(cdev->gadget, usb_desc);
255                 otg_desc[0] = usb_desc;
256                 otg_desc[1] = NULL;
257         }
258
259         status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
260         if (status < 0)
261                 goto fail_otg_desc;
262         usb_composite_overwrite_options(cdev, &coverwrite);
263
264         INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
265         return 0;
266
267 fail_otg_desc:
268         kfree(otg_desc[0]);
269         otg_desc[0] = NULL;
270 fail:
271 #ifndef CONFIG_GADGET_UAC1
272         usb_put_function_instance(fi_uac2);
273 #else
274         usb_put_function_instance(fi_uac1);
275 #endif
276         return status;
277 }
278
279 static int audio_unbind(struct usb_composite_dev *cdev)
280 {
281 #ifdef CONFIG_GADGET_UAC1
282         if (!IS_ERR_OR_NULL(f_uac1))
283                 usb_put_function(f_uac1);
284         if (!IS_ERR_OR_NULL(fi_uac1))
285                 usb_put_function_instance(fi_uac1);
286 #else
287         if (!IS_ERR_OR_NULL(f_uac2))
288                 usb_put_function(f_uac2);
289         if (!IS_ERR_OR_NULL(fi_uac2))
290                 usb_put_function_instance(fi_uac2);
291 #endif
292         kfree(otg_desc[0]);
293         otg_desc[0] = NULL;
294
295         return 0;
296 }
297
298 static struct usb_composite_driver audio_driver = {
299         .name           = "g_audio",
300         .dev            = &device_desc,
301         .strings        = audio_strings,
302         .max_speed      = USB_SPEED_HIGH,
303         .bind           = audio_bind,
304         .unbind         = audio_unbind,
305 };
306
307 module_usb_composite_driver(audio_driver);
308
309 MODULE_DESCRIPTION(DRIVER_DESC);
310 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
311 MODULE_LICENSE("GPL");
312