drivers/usb/gadget/legacy/audio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * audio.c -- Audio gadget driver
   4  *
   5  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   6  * Copyright (C) 2008 Analog Devices, Inc
   7  */
   8
   9 /* #define VERBOSE_DEBUG */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/usb/composite.h>
  14
  15 #define DRIVER_DESC             "Linux USB Audio Gadget"
  16 #define DRIVER_VERSION          "Feb 2, 2012"
  17
  18 USB_GADGET_COMPOSITE_OPTIONS();
  19
  20 #ifndef CONFIG_GADGET_UAC1
  21 #include "u_uac2.h"
  22
  23 /* Playback(USB-IN) Default Stereo - Fl/Fr */
  24 static int p_chmask = UAC2_DEF_PCHMASK;
  25 module_param(p_chmask, uint, S_IRUGO);
  26 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
  27
  28 /* Playback Default 48 KHz */
  29 static int p_srate = UAC2_DEF_PSRATE;
  30 module_param(p_srate, uint, S_IRUGO);
  31 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
  32
  33 /* Playback Default 16bits/sample */
  34 static int p_ssize = UAC2_DEF_PSSIZE;
  35 module_param(p_ssize, uint, S_IRUGO);
  36 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
  37
  38 /* Capture(USB-OUT) Default Stereo - Fl/Fr */
  39 static int c_chmask = UAC2_DEF_CCHMASK;
  40 module_param(c_chmask, uint, S_IRUGO);
  41 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
  42
  43 /* Capture Default 64 KHz */
  44 static int c_srate = UAC2_DEF_CSRATE;
  45 module_param(c_srate, uint, S_IRUGO);
  46 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
  47
  48 /* Capture Default 16bits/sample */
  49 static int c_ssize = UAC2_DEF_CSSIZE;
  50 module_param(c_ssize, uint, S_IRUGO);
  51 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
  52 #else
  53 #ifndef CONFIG_GADGET_UAC1_LEGACY
  54 #include "u_uac1.h"
  55
  56 /* Playback(USB-IN) Default Stereo - Fl/Fr */
  57 static int p_chmask = UAC1_DEF_PCHMASK;
  58 module_param(p_chmask, uint, S_IRUGO);
  59 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
  60
  61 /* Playback Default 48 KHz */
  62 static int p_srate = UAC1_DEF_PSRATE;
  63 module_param(p_srate, uint, S_IRUGO);
  64 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
  65
  66 /* Playback Default 16bits/sample */
  67 static int p_ssize = UAC1_DEF_PSSIZE;
  68 module_param(p_ssize, uint, S_IRUGO);
  69 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
  70
  71 /* Capture(USB-OUT) Default Stereo - Fl/Fr */
  72 static int c_chmask = UAC1_DEF_CCHMASK;
  73 module_param(c_chmask, uint, S_IRUGO);
  74 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
  75
  76 /* Capture Default 48 KHz */
  77 static int c_srate = UAC1_DEF_CSRATE;
  78 module_param(c_srate, uint, S_IRUGO);
  79 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
  80
  81 /* Capture Default 16bits/sample */
  82 static int c_ssize = UAC1_DEF_CSSIZE;
  83 module_param(c_ssize, uint, S_IRUGO);
  84 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
  85 #else /* CONFIG_GADGET_UAC1_LEGACY */
  86 #include "u_uac1_legacy.h"
  87
  88 static char *fn_play = FILE_PCM_PLAYBACK;
  89 module_param(fn_play, charp, S_IRUGO);
  90 MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
  91
  92 static char *fn_cap = FILE_PCM_CAPTURE;
  93 module_param(fn_cap, charp, S_IRUGO);
  94 MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
  95
  96 static char *fn_cntl = FILE_CONTROL;
  97 module_param(fn_cntl, charp, S_IRUGO);
  98 MODULE_PARM_DESC(fn_cntl, "Control device file name");
  99
 100 static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
 101 module_param(req_buf_size, int, S_IRUGO);
 102 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
 103
 104 static int req_count = UAC1_REQ_COUNT;
 105 module_param(req_count, int, S_IRUGO);
 106 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
 107
 108 static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
 109 module_param(audio_buf_size, int, S_IRUGO);
 110 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
 111 #endif /* CONFIG_GADGET_UAC1_LEGACY */
 112 #endif
 113
 114 /* string IDs are assigned dynamically */
 115
 116 static struct usb_string strings_dev[] = {
 117         [USB_GADGET_MANUFACTURER_IDX].s = "",
 118         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 119         [USB_GADGET_SERIAL_IDX].s = "",
 120         {  } /* end of list */
 121 };
 122
 123 static struct usb_gadget_strings stringtab_dev = {
 124         .language = 0x0409,     /* en-us */
 125         .strings = strings_dev,
 126 };
 127
 128 static struct usb_gadget_strings *audio_strings[] = {
 129         &stringtab_dev,
 130         NULL,
 131 };
 132
 133 #ifndef CONFIG_GADGET_UAC1
 134 static struct usb_function_instance *fi_uac2;
 135 static struct usb_function *f_uac2;
 136 #else
 137 static struct usb_function_instance *fi_uac1;
 138 static struct usb_function *f_uac1;
 139 #endif
 140
 141 /*-------------------------------------------------------------------------*/
 142
 143 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 144  * Instead:  allocate your own, using normal USB-IF procedures.
 145  */
 146
 147 /* Thanks to Linux Foundation for donating this product ID. */
 148 #define AUDIO_VENDOR_NUM                0x1d6b  /* Linux Foundation */
 149 #define AUDIO_PRODUCT_NUM               0x0101  /* Linux-USB Audio Gadget */
 150
 151 /*-------------------------------------------------------------------------*/
 152
 153 static struct usb_device_descriptor device_desc = {
 154         .bLength =              sizeof device_desc,
 155         .bDescriptorType =      USB_DT_DEVICE,
 156
 157         /* .bcdUSB = DYNAMIC */
 158
 159 #ifdef CONFIG_GADGET_UAC1_LEGACY
 160         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 161         .bDeviceSubClass =      0,
 162         .bDeviceProtocol =      0,
 163 #else
 164         .bDeviceClass =         USB_CLASS_MISC,
 165         .bDeviceSubClass =      0x02,
 166         .bDeviceProtocol =      0x01,
 167 #endif
 168         /* .bMaxPacketSize0 = f(hardware) */
 169
 170         /* Vendor and product id defaults change according to what configs
 171          * we support.  (As does bNumConfigurations.)  These values can
 172          * also be overridden by module parameters.
 173          */
 174         .idVendor =             cpu_to_le16(AUDIO_VENDOR_NUM),
 175         .idProduct =            cpu_to_le16(AUDIO_PRODUCT_NUM),
 176         /* .bcdDevice = f(hardware) */
 177         /* .iManufacturer = DYNAMIC */
 178         /* .iProduct = DYNAMIC */
 179         /* NO SERIAL NUMBER */
 180         .bNumConfigurations =   1,
 181 };
 182
 183 static const struct usb_descriptor_header *otg_desc[2];
 184
 185 /*-------------------------------------------------------------------------*/
 186
 187 static int audio_do_config(struct usb_configuration *c)
 188 {
 189         int status;
 190
 191         /* FIXME alloc iConfiguration string, set it in c->strings */
 192
 193         if (gadget_is_otg(c->cdev->gadget)) {
 194                 c->descriptors = otg_desc;
 195                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 196         }
 197
 198 #ifdef CONFIG_GADGET_UAC1
 199         f_uac1 = usb_get_function(fi_uac1);
 200         if (IS_ERR(f_uac1)) {
 201                 status = PTR_ERR(f_uac1);
 202                 return status;
 203         }
 204
 205         status = usb_add_function(c, f_uac1);
 206         if (status < 0) {
 207                 usb_put_function(f_uac1);
 208                 return status;
 209         }
 210 #else
 211         f_uac2 = usb_get_function(fi_uac2);
 212         if (IS_ERR(f_uac2)) {
 213                 status = PTR_ERR(f_uac2);
 214                 return status;
 215         }
 216
 217         status = usb_add_function(c, f_uac2);
 218         if (status < 0) {
 219                 usb_put_function(f_uac2);
 220                 return status;
 221         }
 222 #endif
 223
 224         return 0;
 225 }
 226
 227 static struct usb_configuration audio_config_driver = {
 228         .label                  = DRIVER_DESC,
 229         .bConfigurationValue    = 1,
 230         /* .iConfiguration = DYNAMIC */
 231         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 232 };
 233
 234 /*-------------------------------------------------------------------------*/
 235
 236 static int audio_bind(struct usb_composite_dev *cdev)
 237 {
 238 #ifndef CONFIG_GADGET_UAC1
 239         struct f_uac2_opts      *uac2_opts;
 240 #else
 241 #ifndef CONFIG_GADGET_UAC1_LEGACY
 242         struct f_uac1_opts      *uac1_opts;
 243 #else
 244         struct f_uac1_legacy_opts       *uac1_opts;
 245 #endif
 246 #endif
 247         int                     status;
 248
 249 #ifndef CONFIG_GADGET_UAC1
 250         fi_uac2 = usb_get_function_instance("uac2");
 251         if (IS_ERR(fi_uac2))
 252                 return PTR_ERR(fi_uac2);
 253 #else
 254 #ifndef CONFIG_GADGET_UAC1_LEGACY
 255         fi_uac1 = usb_get_function_instance("uac1");
 256 #else
 257         fi_uac1 = usb_get_function_instance("uac1_legacy");
 258 #endif
 259         if (IS_ERR(fi_uac1))
 260                 return PTR_ERR(fi_uac1);
 261 #endif
 262
 263 #ifndef CONFIG_GADGET_UAC1
 264         uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
 265         uac2_opts->p_chmask = p_chmask;
 266         uac2_opts->p_srate = p_srate;
 267         uac2_opts->p_ssize = p_ssize;
 268         uac2_opts->c_chmask = c_chmask;
 269         uac2_opts->c_srate = c_srate;
 270         uac2_opts->c_ssize = c_ssize;
 271         uac2_opts->req_number = UAC2_DEF_REQ_NUM;
 272 #else
 273 #ifndef CONFIG_GADGET_UAC1_LEGACY
 274         uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
 275         uac1_opts->p_chmask = p_chmask;
 276         uac1_opts->p_srate = p_srate;
 277         uac1_opts->p_ssize = p_ssize;
 278         uac1_opts->c_chmask = c_chmask;
 279         uac1_opts->c_srate = c_srate;
 280         uac1_opts->c_ssize = c_ssize;
 281         uac1_opts->req_number = UAC1_DEF_REQ_NUM;
 282 #else /* CONFIG_GADGET_UAC1_LEGACY */
 283         uac1_opts = container_of(fi_uac1, struct f_uac1_legacy_opts, func_inst);
 284         uac1_opts->fn_play = fn_play;
 285         uac1_opts->fn_cap = fn_cap;
 286         uac1_opts->fn_cntl = fn_cntl;
 287         uac1_opts->req_buf_size = req_buf_size;
 288         uac1_opts->req_count = req_count;
 289         uac1_opts->audio_buf_size = audio_buf_size;
 290 #endif /* CONFIG_GADGET_UAC1_LEGACY */
 291 #endif
 292
 293         status = usb_string_ids_tab(cdev, strings_dev);
 294         if (status < 0)
 295                 goto fail;
 296         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 297         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 298
 299         if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
 300                 struct usb_descriptor_header *usb_desc;
 301
 302                 usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
 303                 if (!usb_desc)
 304                         goto fail;
 305                 usb_otg_descriptor_init(cdev->gadget, usb_desc);
 306                 otg_desc[0] = usb_desc;
 307                 otg_desc[1] = NULL;
 308         }
 309
 310         status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
 311         if (status < 0)
 312                 goto fail_otg_desc;
 313         usb_composite_overwrite_options(cdev, &coverwrite);
 314
 315         INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
 316         return 0;
 317
 318 fail_otg_desc:
 319         kfree(otg_desc[0]);
 320         otg_desc[0] = NULL;
 321 fail:
 322 #ifndef CONFIG_GADGET_UAC1
 323         usb_put_function_instance(fi_uac2);
 324 #else
 325         usb_put_function_instance(fi_uac1);
 326 #endif
 327         return status;
 328 }
 329
 330 static int audio_unbind(struct usb_composite_dev *cdev)
 331 {
 332 #ifdef CONFIG_GADGET_UAC1
 333         if (!IS_ERR_OR_NULL(f_uac1))
 334                 usb_put_function(f_uac1);
 335         if (!IS_ERR_OR_NULL(fi_uac1))
 336                 usb_put_function_instance(fi_uac1);
 337 #else
 338         if (!IS_ERR_OR_NULL(f_uac2))
 339                 usb_put_function(f_uac2);
 340         if (!IS_ERR_OR_NULL(fi_uac2))
 341                 usb_put_function_instance(fi_uac2);
 342 #endif
 343         kfree(otg_desc[0]);
 344         otg_desc[0] = NULL;
 345
 346         return 0;
 347 }
 348
 349 static struct usb_composite_driver audio_driver = {
 350         .name           = "g_audio",
 351         .dev            = &device_desc,
 352         .strings        = audio_strings,
 353         .max_speed      = USB_SPEED_HIGH,
 354         .bind           = audio_bind,
 355         .unbind         = audio_unbind,
 356 };
 357
 358 module_usb_composite_driver(audio_driver);
 359
 360 MODULE_DESCRIPTION(DRIVER_DESC);
 361 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
 362 MODULE_LICENSE("GPL");
 363