drivers/usb/gadget/function/f_uac1.c

   1 /*
   2  * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
   3  *
   4  * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
   5  *
   6  * This driver doesn't expect any real Audio codec to be present
   7  * on the device - the audio streams are simply sinked to and
   8  * sourced from a virtual ALSA sound card created.
   9  *
  10  * This file is based on f_uac1.c which is
  11  *   Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
  12  *   Copyright (C) 2008 Analog Devices, Inc
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  */
  19
  20 #include <linux/usb/audio.h>
  21 #include <linux/module.h>
  22
  23 #include "u_audio.h"
  24 #include "u_uac1.h"
  25
  26 struct f_uac1 {
  27         struct g_audio g_audio;
  28         u8 ac_intf, as_in_intf, as_out_intf;
  29         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  30 };
  31
  32 static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
  33 {
  34         return container_of(f, struct f_uac1, g_audio.func);
  35 }
  36
  37 /*
  38  * DESCRIPTORS ... most are static, but strings and full
  39  * configuration descriptors are built on demand.
  40  */
  41
  42 /*
  43  * We have three interfaces - one AudioControl and two AudioStreaming
  44  *
  45  * The driver implements a simple UAC_1 topology.
  46  * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
  47  * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
  48  */
  49 #define F_AUDIO_AC_INTERFACE            0
  50 #define F_AUDIO_AS_OUT_INTERFACE        1
  51 #define F_AUDIO_AS_IN_INTERFACE         2
  52 /* Number of streaming interfaces */
  53 #define F_AUDIO_NUM_INTERFACES          2
  54
  55 /* B.3.1  Standard AC Interface Descriptor */
  56 static struct usb_interface_descriptor ac_interface_desc = {
  57         .bLength =              USB_DT_INTERFACE_SIZE,
  58         .bDescriptorType =      USB_DT_INTERFACE,
  59         .bNumEndpoints =        0,
  60         .bInterfaceClass =      USB_CLASS_AUDIO,
  61         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOCONTROL,
  62 };
  63
  64 /*
  65  * The number of AudioStreaming and MIDIStreaming interfaces
  66  * in the Audio Interface Collection
  67  */
  68 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
  69
  70 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
  71 /* 2 input terminals and 2 output terminals */
  72 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
  73         + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
  74 /* B.3.2  Class-Specific AC Interface Descriptor */
  75 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
  76         .bLength =              UAC_DT_AC_HEADER_LENGTH,
  77         .bDescriptorType =      USB_DT_CS_INTERFACE,
  78         .bDescriptorSubtype =   UAC_HEADER,
  79         .bcdADC =               cpu_to_le16(0x0100),
  80         .wTotalLength =         cpu_to_le16(UAC_DT_TOTAL_LENGTH),
  81         .bInCollection =        F_AUDIO_NUM_INTERFACES,
  82         .baInterfaceNr = {
  83         /* Interface number of the AudioStream interfaces */
  84                 [0] =           1,
  85                 [1] =           2,
  86         }
  87 };
  88
  89 #define USB_OUT_IT_ID   1
  90 static struct uac_input_terminal_descriptor usb_out_it_desc = {
  91         .bLength =              UAC_DT_INPUT_TERMINAL_SIZE,
  92         .bDescriptorType =      USB_DT_CS_INTERFACE,
  93         .bDescriptorSubtype =   UAC_INPUT_TERMINAL,
  94         .bTerminalID =          USB_OUT_IT_ID,
  95         .wTerminalType =        cpu_to_le16(UAC_TERMINAL_STREAMING),
  96         .bAssocTerminal =       0,
  97         .wChannelConfig =       cpu_to_le16(0x3),
  98 };
  99
 100 #define IO_OUT_OT_ID    2
 101 static struct uac1_output_terminal_descriptor io_out_ot_desc = {
 102         .bLength                = UAC_DT_OUTPUT_TERMINAL_SIZE,
 103         .bDescriptorType        = USB_DT_CS_INTERFACE,
 104         .bDescriptorSubtype     = UAC_OUTPUT_TERMINAL,
 105         .bTerminalID            = IO_OUT_OT_ID,
 106         .wTerminalType          = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
 107         .bAssocTerminal         = 0,
 108         .bSourceID              = USB_OUT_IT_ID,
 109 };
 110
 111 #define IO_IN_IT_ID     3
 112 static struct uac_input_terminal_descriptor io_in_it_desc = {
 113         .bLength                = UAC_DT_INPUT_TERMINAL_SIZE,
 114         .bDescriptorType        = USB_DT_CS_INTERFACE,
 115         .bDescriptorSubtype     = UAC_INPUT_TERMINAL,
 116         .bTerminalID            = IO_IN_IT_ID,
 117         .wTerminalType          = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
 118         .bAssocTerminal         = 0,
 119         .wChannelConfig         = cpu_to_le16(0x3),
 120 };
 121
 122 #define USB_IN_OT_ID    4
 123 static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
 124         .bLength =              UAC_DT_OUTPUT_TERMINAL_SIZE,
 125         .bDescriptorType =      USB_DT_CS_INTERFACE,
 126         .bDescriptorSubtype =   UAC_OUTPUT_TERMINAL,
 127         .bTerminalID =          USB_IN_OT_ID,
 128         .wTerminalType =        cpu_to_le16(UAC_TERMINAL_STREAMING),
 129         .bAssocTerminal =       0,
 130         .bSourceID =            IO_IN_IT_ID,
 131 };
 132
 133 /* B.4.1  Standard AS Interface Descriptor */
 134 static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
 135         .bLength =              USB_DT_INTERFACE_SIZE,
 136         .bDescriptorType =      USB_DT_INTERFACE,
 137         .bAlternateSetting =    0,
 138         .bNumEndpoints =        0,
 139         .bInterfaceClass =      USB_CLASS_AUDIO,
 140         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 141 };
 142
 143 static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
 144         .bLength =              USB_DT_INTERFACE_SIZE,
 145         .bDescriptorType =      USB_DT_INTERFACE,
 146         .bAlternateSetting =    1,
 147         .bNumEndpoints =        1,
 148         .bInterfaceClass =      USB_CLASS_AUDIO,
 149         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 150 };
 151
 152 static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
 153         .bLength =              USB_DT_INTERFACE_SIZE,
 154         .bDescriptorType =      USB_DT_INTERFACE,
 155         .bAlternateSetting =    0,
 156         .bNumEndpoints =        0,
 157         .bInterfaceClass =      USB_CLASS_AUDIO,
 158         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 159 };
 160
 161 static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
 162         .bLength =              USB_DT_INTERFACE_SIZE,
 163         .bDescriptorType =      USB_DT_INTERFACE,
 164         .bAlternateSetting =    1,
 165         .bNumEndpoints =        1,
 166         .bInterfaceClass =      USB_CLASS_AUDIO,
 167         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 168 };
 169
 170 /* B.4.2  Class-Specific AS Interface Descriptor */
 171 static struct uac1_as_header_descriptor as_out_header_desc = {
 172         .bLength =              UAC_DT_AS_HEADER_SIZE,
 173         .bDescriptorType =      USB_DT_CS_INTERFACE,
 174         .bDescriptorSubtype =   UAC_AS_GENERAL,
 175         .bTerminalLink =        USB_OUT_IT_ID,
 176         .bDelay =               1,
 177         .wFormatTag =           cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
 178 };
 179
 180 static struct uac1_as_header_descriptor as_in_header_desc = {
 181         .bLength =              UAC_DT_AS_HEADER_SIZE,
 182         .bDescriptorType =      USB_DT_CS_INTERFACE,
 183         .bDescriptorSubtype =   UAC_AS_GENERAL,
 184         .bTerminalLink =        USB_IN_OT_ID,
 185         .bDelay =               1,
 186         .wFormatTag =           cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
 187 };
 188
 189 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
 190
 191 static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
 192         .bLength =              UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
 193         .bDescriptorType =      USB_DT_CS_INTERFACE,
 194         .bDescriptorSubtype =   UAC_FORMAT_TYPE,
 195         .bFormatType =          UAC_FORMAT_TYPE_I,
 196         .bSubframeSize =        2,
 197         .bBitResolution =       16,
 198         .bSamFreqType =         1,
 199 };
 200
 201 /* Standard ISO OUT Endpoint Descriptor */
 202 static struct usb_endpoint_descriptor as_out_ep_desc  = {
 203         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 204         .bDescriptorType =      USB_DT_ENDPOINT,
 205         .bEndpointAddress =     USB_DIR_OUT,
 206         .bmAttributes =         USB_ENDPOINT_SYNC_ADAPTIVE
 207                                 | USB_ENDPOINT_XFER_ISOC,
 208         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 209         .bInterval =            4,
 210 };
 211
 212 /* Class-specific AS ISO OUT Endpoint Descriptor */
 213 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 214         .bLength =              UAC_ISO_ENDPOINT_DESC_SIZE,
 215         .bDescriptorType =      USB_DT_CS_ENDPOINT,
 216         .bDescriptorSubtype =   UAC_EP_GENERAL,
 217         .bmAttributes =         1,
 218         .bLockDelayUnits =      1,
 219         .wLockDelay =           cpu_to_le16(1),
 220 };
 221
 222 static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
 223         .bLength =              UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
 224         .bDescriptorType =      USB_DT_CS_INTERFACE,
 225         .bDescriptorSubtype =   UAC_FORMAT_TYPE,
 226         .bFormatType =          UAC_FORMAT_TYPE_I,
 227         .bSubframeSize =        2,
 228         .bBitResolution =       16,
 229         .bSamFreqType =         1,
 230 };
 231
 232 /* Standard ISO OUT Endpoint Descriptor */
 233 static struct usb_endpoint_descriptor as_in_ep_desc  = {
 234         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 235         .bDescriptorType =      USB_DT_ENDPOINT,
 236         .bEndpointAddress =     USB_DIR_IN,
 237         .bmAttributes =         USB_ENDPOINT_SYNC_ASYNC
 238                                 | USB_ENDPOINT_XFER_ISOC,
 239         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 240         .bInterval =            4,
 241 };
 242
 243 /* Class-specific AS ISO OUT Endpoint Descriptor */
 244 static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
 245         .bLength =              UAC_ISO_ENDPOINT_DESC_SIZE,
 246         .bDescriptorType =      USB_DT_CS_ENDPOINT,
 247         .bDescriptorSubtype =   UAC_EP_GENERAL,
 248         .bmAttributes =         1,
 249         .bLockDelayUnits =      0,
 250         .wLockDelay =           0,
 251 };
 252
 253 static struct usb_descriptor_header *f_audio_desc[] = {
 254         (struct usb_descriptor_header *)&ac_interface_desc,
 255         (struct usb_descriptor_header *)&ac_header_desc,
 256
 257         (struct usb_descriptor_header *)&usb_out_it_desc,
 258         (struct usb_descriptor_header *)&io_out_ot_desc,
 259         (struct usb_descriptor_header *)&io_in_it_desc,
 260         (struct usb_descriptor_header *)&usb_in_ot_desc,
 261
 262         (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
 263         (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
 264         (struct usb_descriptor_header *)&as_out_header_desc,
 265
 266         (struct usb_descriptor_header *)&as_out_type_i_desc,
 267
 268         (struct usb_descriptor_header *)&as_out_ep_desc,
 269         (struct usb_descriptor_header *)&as_iso_out_desc,
 270
 271         (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
 272         (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
 273         (struct usb_descriptor_header *)&as_in_header_desc,
 274
 275         (struct usb_descriptor_header *)&as_in_type_i_desc,
 276
 277         (struct usb_descriptor_header *)&as_in_ep_desc,
 278         (struct usb_descriptor_header *)&as_iso_in_desc,
 279         NULL,
 280 };
 281
 282 enum {
 283         STR_AC_IF,
 284         STR_USB_OUT_IT,
 285         STR_USB_OUT_IT_CH_NAMES,
 286         STR_IO_OUT_OT,
 287         STR_IO_IN_IT,
 288         STR_IO_IN_IT_CH_NAMES,
 289         STR_USB_IN_OT,
 290         STR_AS_OUT_IF_ALT0,
 291         STR_AS_OUT_IF_ALT1,
 292         STR_AS_IN_IF_ALT0,
 293         STR_AS_IN_IF_ALT1,
 294 };
 295
 296 static struct usb_string strings_uac1[] = {
 297         [STR_AC_IF].s = "AC Interface",
 298         [STR_USB_OUT_IT].s = "Playback Input terminal",
 299         [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
 300         [STR_IO_OUT_OT].s = "Playback Output terminal",
 301         [STR_IO_IN_IT].s = "Capture Input terminal",
 302         [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
 303         [STR_USB_IN_OT].s = "Capture Output terminal",
 304         [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
 305         [STR_AS_OUT_IF_ALT1].s = "Playback Active",
 306         [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
 307         [STR_AS_IN_IF_ALT1].s = "Capture Active",
 308         { },
 309 };
 310
 311 static struct usb_gadget_strings str_uac1 = {
 312         .language = 0x0409,     /* en-us */
 313         .strings = strings_uac1,
 314 };
 315
 316 static struct usb_gadget_strings *uac1_strings[] = {
 317         &str_uac1,
 318         NULL,
 319 };
 320
 321 /*
 322  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
 323  */
 324
 325 static int audio_set_endpoint_req(struct usb_function *f,
 326                 const struct usb_ctrlrequest *ctrl)
 327 {
 328         struct usb_composite_dev *cdev = f->config->cdev;
 329         int                     value = -EOPNOTSUPP;
 330         u16                     ep = le16_to_cpu(ctrl->wIndex);
 331         u16                     len = le16_to_cpu(ctrl->wLength);
 332         u16                     w_value = le16_to_cpu(ctrl->wValue);
 333
 334         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 335                         ctrl->bRequest, w_value, len, ep);
 336
 337         switch (ctrl->bRequest) {
 338         case UAC_SET_CUR:
 339                 value = len;
 340                 break;
 341
 342         case UAC_SET_MIN:
 343                 break;
 344
 345         case UAC_SET_MAX:
 346                 break;
 347
 348         case UAC_SET_RES:
 349                 break;
 350
 351         case UAC_SET_MEM:
 352                 break;
 353
 354         default:
 355                 break;
 356         }
 357
 358         return value;
 359 }
 360
 361 static int audio_get_endpoint_req(struct usb_function *f,
 362                 const struct usb_ctrlrequest *ctrl)
 363 {
 364         struct usb_composite_dev *cdev = f->config->cdev;
 365         int value = -EOPNOTSUPP;
 366         u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 367         u16 len = le16_to_cpu(ctrl->wLength);
 368         u16 w_value = le16_to_cpu(ctrl->wValue);
 369
 370         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 371                         ctrl->bRequest, w_value, len, ep);
 372
 373         switch (ctrl->bRequest) {
 374         case UAC_GET_CUR:
 375         case UAC_GET_MIN:
 376         case UAC_GET_MAX:
 377         case UAC_GET_RES:
 378                 value = len;
 379                 break;
 380         case UAC_GET_MEM:
 381                 break;
 382         default:
 383                 break;
 384         }
 385
 386         return value;
 387 }
 388
 389 static int
 390 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 391 {
 392         struct usb_composite_dev *cdev = f->config->cdev;
 393         struct usb_request      *req = cdev->req;
 394         int                     value = -EOPNOTSUPP;
 395         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 396         u16                     w_value = le16_to_cpu(ctrl->wValue);
 397         u16                     w_length = le16_to_cpu(ctrl->wLength);
 398
 399         /* composite driver infrastructure handles everything; interface
 400          * activation uses set_alt().
 401          */
 402         switch (ctrl->bRequestType) {
 403         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 404                 value = audio_set_endpoint_req(f, ctrl);
 405                 break;
 406
 407         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 408                 value = audio_get_endpoint_req(f, ctrl);
 409                 break;
 410
 411         default:
 412                 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
 413                         ctrl->bRequestType, ctrl->bRequest,
 414                         w_value, w_index, w_length);
 415         }
 416
 417         /* respond with data transfer or status phase? */
 418         if (value >= 0) {
 419                 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
 420                         ctrl->bRequestType, ctrl->bRequest,
 421                         w_value, w_index, w_length);
 422                 req->zero = 0;
 423                 req->length = value;
 424                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
 425                 if (value < 0)
 426                         ERROR(cdev, "audio response on err %d\n", value);
 427         }
 428
 429         /* device either stalls (value < 0) or reports success */
 430         return value;
 431 }
 432
 433 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 434 {
 435         struct usb_composite_dev *cdev = f->config->cdev;
 436         struct usb_gadget *gadget = cdev->gadget;
 437         struct device *dev = &gadget->dev;
 438         struct f_uac1 *uac1 = func_to_uac1(f);
 439         int ret = 0;
 440
 441         /* No i/f has more than 2 alt settings */
 442         if (alt > 1) {
 443                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 444                 return -EINVAL;
 445         }
 446
 447         if (intf == uac1->ac_intf) {
 448                 /* Control I/f has only 1 AltSetting - 0 */
 449                 if (alt) {
 450                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 451                         return -EINVAL;
 452                 }
 453                 return 0;
 454         }
 455
 456         if (intf == uac1->as_out_intf) {
 457                 uac1->as_out_alt = alt;
 458
 459                 if (alt)
 460                         ret = u_audio_start_capture(&uac1->g_audio);
 461                 else
 462                         u_audio_stop_capture(&uac1->g_audio);
 463         } else if (intf == uac1->as_in_intf) {
 464                 uac1->as_in_alt = alt;
 465
 466                         if (alt)
 467                                 ret = u_audio_start_playback(&uac1->g_audio);
 468                         else
 469                                 u_audio_stop_playback(&uac1->g_audio);
 470         } else {
 471                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 472                 return -EINVAL;
 473         }
 474
 475         return ret;
 476 }
 477
 478 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
 479 {
 480         struct usb_composite_dev *cdev = f->config->cdev;
 481         struct usb_gadget *gadget = cdev->gadget;
 482         struct device *dev = &gadget->dev;
 483         struct f_uac1 *uac1 = func_to_uac1(f);
 484
 485         if (intf == uac1->ac_intf)
 486                 return uac1->ac_alt;
 487         else if (intf == uac1->as_out_intf)
 488                 return uac1->as_out_alt;
 489         else if (intf == uac1->as_in_intf)
 490                 return uac1->as_in_alt;
 491         else
 492                 dev_err(dev, "%s:%d Invalid Interface %d!\n",
 493                         __func__, __LINE__, intf);
 494
 495         return -EINVAL;
 496 }
 497
 498
 499 static void f_audio_disable(struct usb_function *f)
 500 {
 501         struct f_uac1 *uac1 = func_to_uac1(f);
 502
 503         uac1->as_out_alt = 0;
 504         uac1->as_in_alt = 0;
 505
 506         u_audio_stop_capture(&uac1->g_audio);
 507 }
 508
 509 /*-------------------------------------------------------------------------*/
 510
 511 /* audio function driver setup/binding */
 512 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 513 {
 514         struct usb_composite_dev        *cdev = c->cdev;
 515         struct usb_gadget               *gadget = cdev->gadget;
 516         struct f_uac1                   *uac1 = func_to_uac1(f);
 517         struct g_audio                  *audio = func_to_g_audio(f);
 518         struct f_uac1_opts              *audio_opts;
 519         struct usb_ep                   *ep = NULL;
 520         struct usb_string               *us;
 521         u8                              *sam_freq;
 522         int                             rate;
 523         int                             status;
 524
 525         audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
 526
 527         us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
 528         if (IS_ERR(us))
 529                 return PTR_ERR(us);
 530         ac_interface_desc.iInterface = us[STR_AC_IF].id;
 531         usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
 532         usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
 533         io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
 534         as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
 535         as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
 536         io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
 537         io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
 538         usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
 539         as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
 540         as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
 541
 542         /* Set channel numbers */
 543         usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
 544         usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
 545         as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
 546         as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
 547         as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
 548         io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
 549         io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
 550         as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
 551         as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
 552         as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
 553
 554         /* Set sample rates */
 555         rate = audio_opts->c_srate;
 556         sam_freq = as_out_type_i_desc.tSamFreq[0];
 557         memcpy(sam_freq, &rate, 3);
 558         rate = audio_opts->p_srate;
 559         sam_freq = as_in_type_i_desc.tSamFreq[0];
 560         memcpy(sam_freq, &rate, 3);
 561
 562         /* allocate instance-specific interface IDs, and patch descriptors */
 563         status = usb_interface_id(c, f);
 564         if (status < 0)
 565                 goto fail;
 566         ac_interface_desc.bInterfaceNumber = status;
 567         uac1->ac_intf = status;
 568         uac1->ac_alt = 0;
 569
 570         status = usb_interface_id(c, f);
 571         if (status < 0)
 572                 goto fail;
 573         as_out_interface_alt_0_desc.bInterfaceNumber = status;
 574         as_out_interface_alt_1_desc.bInterfaceNumber = status;
 575         uac1->as_out_intf = status;
 576         uac1->as_out_alt = 0;
 577
 578         status = usb_interface_id(c, f);
 579         if (status < 0)
 580                 goto fail;
 581         as_in_interface_alt_0_desc.bInterfaceNumber = status;
 582         as_in_interface_alt_1_desc.bInterfaceNumber = status;
 583         uac1->as_in_intf = status;
 584         uac1->as_in_alt = 0;
 585
 586         audio->gadget = gadget;
 587
 588         status = -ENODEV;
 589
 590         /* allocate instance-specific endpoints */
 591         ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
 592         if (!ep)
 593                 goto fail;
 594         audio->out_ep = ep;
 595         audio->out_ep->desc = &as_out_ep_desc;
 596
 597         ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
 598         if (!ep)
 599                 goto fail;
 600         audio->in_ep = ep;
 601         audio->in_ep->desc = &as_in_ep_desc;
 602
 603         /* copy descriptors, and track endpoint copies */
 604         status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
 605                                         NULL);
 606         if (status)
 607                 goto fail;
 608
 609         audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
 610         audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
 611         audio->params.c_chmask = audio_opts->c_chmask;
 612         audio->params.c_srate = audio_opts->c_srate;
 613         audio->params.c_ssize = audio_opts->c_ssize;
 614         audio->params.p_chmask = audio_opts->p_chmask;
 615         audio->params.p_srate = audio_opts->p_srate;
 616         audio->params.p_ssize = audio_opts->p_ssize;
 617         audio->params.req_number = audio_opts->req_number;
 618
 619         status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
 620         if (status)
 621                 goto err_card_register;
 622
 623         return 0;
 624
 625 err_card_register:
 626         usb_free_all_descriptors(f);
 627 fail:
 628         return status;
 629 }
 630
 631 /*-------------------------------------------------------------------------*/
 632
 633 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
 634 {
 635         return container_of(to_config_group(item), struct f_uac1_opts,
 636                             func_inst.group);
 637 }
 638
 639 static void f_uac1_attr_release(struct config_item *item)
 640 {
 641         struct f_uac1_opts *opts = to_f_uac1_opts(item);
 642
 643         usb_put_function_instance(&opts->func_inst);
 644 }
 645
 646 static struct configfs_item_operations f_uac1_item_ops = {
 647         .release        = f_uac1_attr_release,
 648 };
 649
 650 #define UAC1_ATTRIBUTE(name)                                            \
 651 static ssize_t f_uac1_opts_##name##_show(                               \
 652                                           struct config_item *item,     \
 653                                           char *page)                   \
 654 {                                                                       \
 655         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
 656         int result;                                                     \
 657                                                                         \
 658         mutex_lock(&opts->lock);                                        \
 659         result = sprintf(page, "%u\n", opts->name);                     \
 660         mutex_unlock(&opts->lock);                                      \
 661                                                                         \
 662         return result;                                                  \
 663 }                                                                       \
 664                                                                         \
 665 static ssize_t f_uac1_opts_##name##_store(                              \
 666                                           struct config_item *item,     \
 667                                           const char *page, size_t len) \
 668 {                                                                       \
 669         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
 670         int ret;                                                        \
 671         u32 num;                                                        \
 672                                                                         \
 673         mutex_lock(&opts->lock);                                        \
 674         if (opts->refcnt) {                                             \
 675                 ret = -EBUSY;                                           \
 676                 goto end;                                               \
 677         }                                                               \
 678                                                                         \
 679         ret = kstrtou32(page, 0, &num);                                 \
 680         if (ret)                                                        \
 681                 goto end;                                               \
 682                                                                         \
 683         opts->name = num;                                               \
 684         ret = len;                                                      \
 685                                                                         \
 686 end:                                                                    \
 687         mutex_unlock(&opts->lock);                                      \
 688         return ret;                                                     \
 689 }                                                                       \
 690                                                                         \
 691 CONFIGFS_ATTR(f_uac1_opts_, name)
 692
 693 UAC1_ATTRIBUTE(c_chmask);
 694 UAC1_ATTRIBUTE(c_srate);
 695 UAC1_ATTRIBUTE(c_ssize);
 696 UAC1_ATTRIBUTE(p_chmask);
 697 UAC1_ATTRIBUTE(p_srate);
 698 UAC1_ATTRIBUTE(p_ssize);
 699 UAC1_ATTRIBUTE(req_number);
 700
 701 static struct configfs_attribute *f_uac1_attrs[] = {
 702         &f_uac1_opts_attr_c_chmask,
 703         &f_uac1_opts_attr_c_srate,
 704         &f_uac1_opts_attr_c_ssize,
 705         &f_uac1_opts_attr_p_chmask,
 706         &f_uac1_opts_attr_p_srate,
 707         &f_uac1_opts_attr_p_ssize,
 708         &f_uac1_opts_attr_req_number,
 709         NULL,
 710 };
 711
 712 static struct config_item_type f_uac1_func_type = {
 713         .ct_item_ops    = &f_uac1_item_ops,
 714         .ct_attrs       = f_uac1_attrs,
 715         .ct_owner       = THIS_MODULE,
 716 };
 717
 718 static void f_audio_free_inst(struct usb_function_instance *f)
 719 {
 720         struct f_uac1_opts *opts;
 721
 722         opts = container_of(f, struct f_uac1_opts, func_inst);
 723         kfree(opts);
 724 }
 725
 726 static struct usb_function_instance *f_audio_alloc_inst(void)
 727 {
 728         struct f_uac1_opts *opts;
 729
 730         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 731         if (!opts)
 732                 return ERR_PTR(-ENOMEM);
 733
 734         mutex_init(&opts->lock);
 735         opts->func_inst.free_func_inst = f_audio_free_inst;
 736
 737         config_group_init_type_name(&opts->func_inst.group, "",
 738                                     &f_uac1_func_type);
 739
 740         opts->c_chmask = UAC1_DEF_CCHMASK;
 741         opts->c_srate = UAC1_DEF_CSRATE;
 742         opts->c_ssize = UAC1_DEF_CSSIZE;
 743         opts->p_chmask = UAC1_DEF_PCHMASK;
 744         opts->p_srate = UAC1_DEF_PSRATE;
 745         opts->p_ssize = UAC1_DEF_PSSIZE;
 746         opts->req_number = UAC1_DEF_REQ_NUM;
 747         return &opts->func_inst;
 748 }
 749
 750 static void f_audio_free(struct usb_function *f)
 751 {
 752         struct g_audio *audio;
 753         struct f_uac1_opts *opts;
 754
 755         audio = func_to_g_audio(f);
 756         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
 757         kfree(audio);
 758         mutex_lock(&opts->lock);
 759         --opts->refcnt;
 760         mutex_unlock(&opts->lock);
 761 }
 762
 763 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
 764 {
 765         struct g_audio *audio = func_to_g_audio(f);
 766
 767         g_audio_cleanup(audio);
 768         usb_free_all_descriptors(f);
 769
 770         audio->gadget = NULL;
 771 }
 772
 773 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
 774 {
 775         struct f_uac1 *uac1;
 776         struct f_uac1_opts *opts;
 777
 778         /* allocate and initialize one new instance */
 779         uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
 780         if (!uac1)
 781                 return ERR_PTR(-ENOMEM);
 782
 783         opts = container_of(fi, struct f_uac1_opts, func_inst);
 784         mutex_lock(&opts->lock);
 785         ++opts->refcnt;
 786         mutex_unlock(&opts->lock);
 787
 788         uac1->g_audio.func.name = "uac1_func";
 789         uac1->g_audio.func.bind = f_audio_bind;
 790         uac1->g_audio.func.unbind = f_audio_unbind;
 791         uac1->g_audio.func.set_alt = f_audio_set_alt;
 792         uac1->g_audio.func.get_alt = f_audio_get_alt;
 793         uac1->g_audio.func.setup = f_audio_setup;
 794         uac1->g_audio.func.disable = f_audio_disable;
 795         uac1->g_audio.func.free_func = f_audio_free;
 796
 797         return &uac1->g_audio.func;
 798 }
 799
 800 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
 801 MODULE_LICENSE("GPL");
 802 MODULE_AUTHOR("Ruslan Bilovol");