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 = DYNAMIC */
 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         uac2_opts->req_number = UAC2_DEF_REQ_NUM;
 233 #else
 234         uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
 235         uac1_opts->fn_play = fn_play;
 236         uac1_opts->fn_cap = fn_cap;
 237         uac1_opts->fn_cntl = fn_cntl;
 238         uac1_opts->req_buf_size = req_buf_size;
 239         uac1_opts->req_count = req_count;
 240         uac1_opts->audio_buf_size = audio_buf_size;
 241 #endif
 242
 243         status = usb_string_ids_tab(cdev, strings_dev);
 244         if (status < 0)
 245                 goto fail;
 246         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 247         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 248
 249         if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
 250                 struct usb_descriptor_header *usb_desc;
 251
 252                 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 253                 if (!usb_desc)
 254                         goto fail;
 255                 usb_otg_descriptor_init(cdev->gadget, usb_desc);
 256                 otg_desc[0] = usb_desc;
 257                 otg_desc[1] = NULL;
 258         }
 259
 260         status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
 261         if (status < 0)
 262                 goto fail_otg_desc;
 263         usb_composite_overwrite_options(cdev, &coverwrite);
 264
 265         INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
 266         return 0;
 267
 268 fail_otg_desc:
 269         kfree(otg_desc[0]);
 270         otg_desc[0] = NULL;
 271 fail:
 272 #ifndef CONFIG_GADGET_UAC1
 273         usb_put_function_instance(fi_uac2);
 274 #else
 275         usb_put_function_instance(fi_uac1);
 276 #endif
 277         return status;
 278 }
 279
 280 static int audio_unbind(struct usb_composite_dev *cdev)
 281 {
 282 #ifdef CONFIG_GADGET_UAC1
 283         if (!IS_ERR_OR_NULL(f_uac1))
 284                 usb_put_function(f_uac1);
 285         if (!IS_ERR_OR_NULL(fi_uac1))
 286                 usb_put_function_instance(fi_uac1);
 287 #else
 288         if (!IS_ERR_OR_NULL(f_uac2))
 289                 usb_put_function(f_uac2);
 290         if (!IS_ERR_OR_NULL(fi_uac2))
 291                 usb_put_function_instance(fi_uac2);
 292 #endif
 293         kfree(otg_desc[0]);
 294         otg_desc[0] = NULL;
 295
 296         return 0;
 297 }
 298
 299 static struct usb_composite_driver audio_driver = {
 300         .name           = "g_audio",
 301         .dev            = &device_desc,
 302         .strings        = audio_strings,
 303         .max_speed      = USB_SPEED_HIGH,
 304         .bind           = audio_bind,
 305         .unbind         = audio_unbind,
 306 };
 307
 308 module_usb_composite_driver(audio_driver);
 309
 310 MODULE_DESCRIPTION(DRIVER_DESC);
 311 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
 312 MODULE_LICENSE("GPL");
 313