drivers/usb/gadget/function/f_uac1.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
   4  *
   5  * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
   6  * Copyright (C) 2021 Julian Scheel <julian@jusst.de>
   7  *
   8  * This driver doesn't expect any real Audio codec to be present
   9  * on the device - the audio streams are simply sinked to and
  10  * sourced from a virtual ALSA sound card created.
  11  *
  12  * This file is based on f_uac1.c which is
  13  *   Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
  14  *   Copyright (C) 2008 Analog Devices, Inc
  15  */
  16
  17 #include <linux/usb/audio.h>
  18 #include <linux/module.h>
  19
  20 #include "u_audio.h"
  21 #include "u_uac1.h"
  22
  23 /* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */
  24 #define UAC1_CHANNEL_MASK 0x0FFF
  25
  26 #define USB_OUT_FU_ID   (out_feature_unit_desc->bUnitID)
  27 #define USB_IN_FU_ID    (in_feature_unit_desc->bUnitID)
  28
  29 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
  30 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
  31 #define FUIN_EN(_opts) ((_opts)->p_mute_present \
  32                         || (_opts)->p_volume_present)
  33 #define FUOUT_EN(_opts) ((_opts)->c_mute_present \
  34                         || (_opts)->c_volume_present)
  35
  36 struct f_uac1 {
  37         struct g_audio g_audio;
  38         u8 ac_intf, as_in_intf, as_out_intf;
  39         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  40
  41         struct usb_ctrlrequest setup_cr;        /* will be used in data stage */
  42
  43         /* Interrupt IN endpoint of AC interface */
  44         struct usb_ep   *int_ep;
  45         atomic_t        int_count;
  46         int ctl_id;             /* EP id */
  47         int c_srate;    /* current capture srate */
  48         int p_srate;    /* current playback prate */
  49 };
  50
  51 static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
  52 {
  53         return container_of(f, struct f_uac1, g_audio.func);
  54 }
  55
  56 static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio)
  57 {
  58         return container_of(audio->func.fi, struct f_uac1_opts, func_inst);
  59 }
  60
  61 /*
  62  * DESCRIPTORS ... most are static, but strings and full
  63  * configuration descriptors are built on demand.
  64  */
  65
  66 /*
  67  * We have three interfaces - one AudioControl and two AudioStreaming
  68  *
  69  * The driver implements a simple UAC_1 topology.
  70  * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
  71  * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
  72  */
  73
  74 /* B.3.1  Standard AC Interface Descriptor */
  75 static struct usb_interface_descriptor ac_interface_desc = {
  76         .bLength =              USB_DT_INTERFACE_SIZE,
  77         .bDescriptorType =      USB_DT_INTERFACE,
  78         /* .bNumEndpoints =     DYNAMIC */
  79         .bInterfaceClass =      USB_CLASS_AUDIO,
  80         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOCONTROL,
  81 };
  82
  83 /* B.3.2  Class-Specific AC Interface Descriptor */
  84 static struct uac1_ac_header_descriptor *ac_header_desc;
  85
  86 static struct uac_input_terminal_descriptor usb_out_it_desc = {
  87         .bLength =              UAC_DT_INPUT_TERMINAL_SIZE,
  88         .bDescriptorType =      USB_DT_CS_INTERFACE,
  89         .bDescriptorSubtype =   UAC_INPUT_TERMINAL,
  90         /* .bTerminalID =       DYNAMIC */
  91         .wTerminalType =        cpu_to_le16(UAC_TERMINAL_STREAMING),
  92         .bAssocTerminal =       0,
  93         .wChannelConfig =       cpu_to_le16(0x3),
  94 };
  95
  96 static struct uac1_output_terminal_descriptor io_out_ot_desc = {
  97         .bLength                = UAC_DT_OUTPUT_TERMINAL_SIZE,
  98         .bDescriptorType        = USB_DT_CS_INTERFACE,
  99         .bDescriptorSubtype     = UAC_OUTPUT_TERMINAL,
 100         /* .bTerminalID =       DYNAMIC */
 101         .wTerminalType          = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
 102         .bAssocTerminal         = 0,
 103         /* .bSourceID =         DYNAMIC */
 104 };
 105
 106 static struct uac_input_terminal_descriptor io_in_it_desc = {
 107         .bLength                = UAC_DT_INPUT_TERMINAL_SIZE,
 108         .bDescriptorType        = USB_DT_CS_INTERFACE,
 109         .bDescriptorSubtype     = UAC_INPUT_TERMINAL,
 110         /* .bTerminalID         = DYNAMIC */
 111         .wTerminalType          = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
 112         .bAssocTerminal         = 0,
 113         .wChannelConfig         = cpu_to_le16(0x3),
 114 };
 115
 116 static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
 117         .bLength =              UAC_DT_OUTPUT_TERMINAL_SIZE,
 118         .bDescriptorType =      USB_DT_CS_INTERFACE,
 119         .bDescriptorSubtype =   UAC_OUTPUT_TERMINAL,
 120         /* .bTerminalID =       DYNAMIC */
 121         .wTerminalType =        cpu_to_le16(UAC_TERMINAL_STREAMING),
 122         .bAssocTerminal =       0,
 123         /* .bSourceID =         DYNAMIC */
 124 };
 125
 126 static struct uac_feature_unit_descriptor *in_feature_unit_desc;
 127 static struct uac_feature_unit_descriptor *out_feature_unit_desc;
 128
 129 /* AC IN Interrupt Endpoint */
 130 static struct usb_endpoint_descriptor ac_int_ep_desc = {
 131         .bLength = USB_DT_ENDPOINT_SIZE,
 132         .bDescriptorType = USB_DT_ENDPOINT,
 133         .bEndpointAddress = USB_DIR_IN,
 134         .bmAttributes = USB_ENDPOINT_XFER_INT,
 135         .wMaxPacketSize = cpu_to_le16(2),
 136         .bInterval = 4,
 137 };
 138
 139 /* B.4.1  Standard AS Interface Descriptor */
 140 static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
 141         .bLength =              USB_DT_INTERFACE_SIZE,
 142         .bDescriptorType =      USB_DT_INTERFACE,
 143         .bAlternateSetting =    0,
 144         .bNumEndpoints =        0,
 145         .bInterfaceClass =      USB_CLASS_AUDIO,
 146         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 147 };
 148
 149 static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
 150         .bLength =              USB_DT_INTERFACE_SIZE,
 151         .bDescriptorType =      USB_DT_INTERFACE,
 152         .bAlternateSetting =    1,
 153         .bNumEndpoints =        1,
 154         .bInterfaceClass =      USB_CLASS_AUDIO,
 155         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 156 };
 157
 158 static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
 159         .bLength =              USB_DT_INTERFACE_SIZE,
 160         .bDescriptorType =      USB_DT_INTERFACE,
 161         .bAlternateSetting =    0,
 162         .bNumEndpoints =        0,
 163         .bInterfaceClass =      USB_CLASS_AUDIO,
 164         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 165 };
 166
 167 static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
 168         .bLength =              USB_DT_INTERFACE_SIZE,
 169         .bDescriptorType =      USB_DT_INTERFACE,
 170         .bAlternateSetting =    1,
 171         .bNumEndpoints =        1,
 172         .bInterfaceClass =      USB_CLASS_AUDIO,
 173         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 174 };
 175
 176 /* B.4.2  Class-Specific AS Interface Descriptor */
 177 static struct uac1_as_header_descriptor as_out_header_desc = {
 178         .bLength =              UAC_DT_AS_HEADER_SIZE,
 179         .bDescriptorType =      USB_DT_CS_INTERFACE,
 180         .bDescriptorSubtype =   UAC_AS_GENERAL,
 181         /* .bTerminalLink =     DYNAMIC */
 182         .bDelay =               1,
 183         .wFormatTag =           cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
 184 };
 185
 186 static struct uac1_as_header_descriptor as_in_header_desc = {
 187         .bLength =              UAC_DT_AS_HEADER_SIZE,
 188         .bDescriptorType =      USB_DT_CS_INTERFACE,
 189         .bDescriptorSubtype =   UAC_AS_GENERAL,
 190         /* .bTerminalLink =     DYNAMIC */
 191         .bDelay =               1,
 192         .wFormatTag =           cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
 193 };
 194
 195 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_MAX_RATES);
 196 #define uac_format_type_i_discrete_descriptor                   \
 197         uac_format_type_i_discrete_descriptor_##UAC_MAX_RATES
 198
 199 static struct uac_format_type_i_discrete_descriptor as_out_type_i_desc = {
 200         .bLength =              0, /* filled on rate setup */
 201         .bDescriptorType =      USB_DT_CS_INTERFACE,
 202         .bDescriptorSubtype =   UAC_FORMAT_TYPE,
 203         .bFormatType =          UAC_FORMAT_TYPE_I,
 204         .bSubframeSize =        2,
 205         .bBitResolution =       16,
 206         .bSamFreqType =         0, /* filled on rate setup */
 207 };
 208
 209 /* Standard ISO OUT Endpoint Descriptor */
 210 static struct usb_endpoint_descriptor as_out_ep_desc  = {
 211         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 212         .bDescriptorType =      USB_DT_ENDPOINT,
 213         .bEndpointAddress =     USB_DIR_OUT,
 214         .bmAttributes =         USB_ENDPOINT_SYNC_ADAPTIVE
 215                                 | USB_ENDPOINT_XFER_ISOC,
 216         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 217         .bInterval =            4,
 218 };
 219
 220 /* Class-specific AS ISO OUT Endpoint Descriptor */
 221 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 222         .bLength =              UAC_ISO_ENDPOINT_DESC_SIZE,
 223         .bDescriptorType =      USB_DT_CS_ENDPOINT,
 224         .bDescriptorSubtype =   UAC_EP_GENERAL,
 225         .bmAttributes =         1,
 226         .bLockDelayUnits =      1,
 227         .wLockDelay =           cpu_to_le16(1),
 228 };
 229
 230 static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = {
 231         .bLength =              0, /* filled on rate setup */
 232         .bDescriptorType =      USB_DT_CS_INTERFACE,
 233         .bDescriptorSubtype =   UAC_FORMAT_TYPE,
 234         .bFormatType =          UAC_FORMAT_TYPE_I,
 235         .bSubframeSize =        2,
 236         .bBitResolution =       16,
 237         .bSamFreqType =         0, /* filled on rate setup */
 238 };
 239
 240 /* Standard ISO OUT Endpoint Descriptor */
 241 static struct usb_endpoint_descriptor as_in_ep_desc  = {
 242         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 243         .bDescriptorType =      USB_DT_ENDPOINT,
 244         .bEndpointAddress =     USB_DIR_IN,
 245         .bmAttributes =         USB_ENDPOINT_SYNC_ASYNC
 246                                 | USB_ENDPOINT_XFER_ISOC,
 247         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 248         .bInterval =            4,
 249 };
 250
 251 /* Class-specific AS ISO OUT Endpoint Descriptor */
 252 static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
 253         .bLength =              UAC_ISO_ENDPOINT_DESC_SIZE,
 254         .bDescriptorType =      USB_DT_CS_ENDPOINT,
 255         .bDescriptorSubtype =   UAC_EP_GENERAL,
 256         .bmAttributes =         1,
 257         .bLockDelayUnits =      0,
 258         .wLockDelay =           0,
 259 };
 260
 261 static struct usb_descriptor_header *f_audio_desc[] = {
 262         (struct usb_descriptor_header *)&ac_interface_desc,
 263         (struct usb_descriptor_header *)&ac_header_desc,
 264
 265         (struct usb_descriptor_header *)&usb_out_it_desc,
 266         (struct usb_descriptor_header *)&io_out_ot_desc,
 267         (struct usb_descriptor_header *)&out_feature_unit_desc,
 268
 269         (struct usb_descriptor_header *)&io_in_it_desc,
 270         (struct usb_descriptor_header *)&usb_in_ot_desc,
 271         (struct usb_descriptor_header *)&in_feature_unit_desc,
 272
 273         (struct usb_descriptor_header *)&ac_int_ep_desc,
 274
 275         (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
 276         (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
 277         (struct usb_descriptor_header *)&as_out_header_desc,
 278
 279         (struct usb_descriptor_header *)&as_out_type_i_desc,
 280
 281         (struct usb_descriptor_header *)&as_out_ep_desc,
 282         (struct usb_descriptor_header *)&as_iso_out_desc,
 283
 284         (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
 285         (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
 286         (struct usb_descriptor_header *)&as_in_header_desc,
 287
 288         (struct usb_descriptor_header *)&as_in_type_i_desc,
 289
 290         (struct usb_descriptor_header *)&as_in_ep_desc,
 291         (struct usb_descriptor_header *)&as_iso_in_desc,
 292         NULL,
 293 };
 294
 295 enum {
 296         STR_AC_IF,
 297         STR_USB_OUT_IT,
 298         STR_USB_OUT_IT_CH_NAMES,
 299         STR_IO_OUT_OT,
 300         STR_IO_IN_IT,
 301         STR_IO_IN_IT_CH_NAMES,
 302         STR_USB_IN_OT,
 303         STR_FU_IN,
 304         STR_FU_OUT,
 305         STR_AS_OUT_IF_ALT0,
 306         STR_AS_OUT_IF_ALT1,
 307         STR_AS_IN_IF_ALT0,
 308         STR_AS_IN_IF_ALT1,
 309 };
 310
 311 static struct usb_string strings_uac1[] = {
 312         /* [STR_AC_IF].s = DYNAMIC, */
 313         [STR_USB_OUT_IT].s = "Playback Input terminal",
 314         [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
 315         [STR_IO_OUT_OT].s = "Playback Output terminal",
 316         [STR_IO_IN_IT].s = "Capture Input terminal",
 317         [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
 318         [STR_USB_IN_OT].s = "Capture Output terminal",
 319         [STR_FU_IN].s = "Capture Volume",
 320         [STR_FU_OUT].s = "Playback Volume",
 321         [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
 322         [STR_AS_OUT_IF_ALT1].s = "Playback Active",
 323         [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
 324         [STR_AS_IN_IF_ALT1].s = "Capture Active",
 325         { },
 326 };
 327
 328 static struct usb_gadget_strings str_uac1 = {
 329         .language = 0x0409,     /* en-us */
 330         .strings = strings_uac1,
 331 };
 332
 333 static struct usb_gadget_strings *uac1_strings[] = {
 334         &str_uac1,
 335         NULL,
 336 };
 337
 338 /*
 339  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
 340  */
 341
 342 static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
 343 {
 344         struct usb_function *fn = ep->driver_data;
 345         struct usb_composite_dev *cdev = fn->config->cdev;
 346         struct g_audio *agdev = func_to_g_audio(fn);
 347         struct f_uac1 *uac1 = func_to_uac1(fn);
 348         u8 *buf = (u8 *)req->buf;
 349         u32 val = 0;
 350
 351         if (req->actual != 3) {
 352                 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
 353                 return;
 354         }
 355
 356         val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
 357         if (uac1->ctl_id == (USB_DIR_IN | 2)) {
 358                 uac1->p_srate = val;
 359                 u_audio_set_playback_srate(agdev, uac1->p_srate);
 360         } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
 361                 uac1->c_srate = val;
 362                 u_audio_set_capture_srate(agdev, uac1->c_srate);
 363         }
 364 }
 365
 366 static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
 367 {
 368         struct g_audio *audio = req->context;
 369         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 370
 371         atomic_dec(&uac1->int_count);
 372         kfree(req->buf);
 373         usb_ep_free_request(_ep, req);
 374 }
 375
 376 static int audio_notify(struct g_audio *audio, int unit_id, int cs)
 377 {
 378         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 379         struct usb_request *req;
 380         struct uac1_status_word *msg;
 381         int ret;
 382
 383         if (!uac1->int_ep->enabled)
 384                 return 0;
 385
 386         if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
 387                 atomic_dec(&uac1->int_count);
 388                 return 0;
 389         }
 390
 391         req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC);
 392         if (req == NULL) {
 393                 ret = -ENOMEM;
 394                 goto err_dec_int_count;
 395         }
 396
 397         msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
 398         if (msg == NULL) {
 399                 ret = -ENOMEM;
 400                 goto err_free_request;
 401         }
 402
 403         msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
 404                                 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
 405         msg->bOriginator = unit_id;
 406
 407         req->length = sizeof(*msg);
 408         req->buf = msg;
 409         req->context = audio;
 410         req->complete = audio_notify_complete;
 411
 412         ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC);
 413
 414         if (ret)
 415                 goto err_free_msg;
 416
 417         return 0;
 418
 419 err_free_msg:
 420         kfree(msg);
 421 err_free_request:
 422         usb_ep_free_request(uac1->int_ep, req);
 423 err_dec_int_count:
 424         atomic_dec(&uac1->int_count);
 425
 426         return ret;
 427 }
 428
 429 static int
 430 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 431 {
 432         struct usb_request *req = fn->config->cdev->req;
 433         struct g_audio *audio = func_to_g_audio(fn);
 434         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 435         u16 w_length = le16_to_cpu(cr->wLength);
 436         u16 w_index = le16_to_cpu(cr->wIndex);
 437         u16 w_value = le16_to_cpu(cr->wValue);
 438         u8 entity_id = (w_index >> 8) & 0xff;
 439         u8 control_selector = w_value >> 8;
 440         int value = -EOPNOTSUPP;
 441
 442         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 443                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 444                 unsigned int is_playback = 0;
 445
 446                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 447                         is_playback = 1;
 448
 449                 if (control_selector == UAC_FU_MUTE) {
 450                         unsigned int mute;
 451
 452                         u_audio_get_mute(audio, is_playback, &mute);
 453
 454                         *(u8 *)req->buf = mute;
 455                         value = min_t(unsigned int, w_length, 1);
 456                 } else if (control_selector == UAC_FU_VOLUME) {
 457                         __le16 c;
 458                         s16 volume;
 459
 460                         u_audio_get_volume(audio, is_playback, &volume);
 461
 462                         c = cpu_to_le16(volume);
 463
 464                         value = min_t(unsigned int, w_length, sizeof(c));
 465                         memcpy(req->buf, &c, value);
 466                 } else {
 467                         dev_err(&audio->gadget->dev,
 468                                 "%s:%d control_selector=%d TODO!\n",
 469                                 __func__, __LINE__, control_selector);
 470                 }
 471         } else {
 472                 dev_err(&audio->gadget->dev,
 473                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 474                         __func__, __LINE__, entity_id, control_selector);
 475         }
 476
 477         return value;
 478 }
 479
 480 static int
 481 in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 482 {
 483         struct usb_request *req = fn->config->cdev->req;
 484         struct g_audio *audio = func_to_g_audio(fn);
 485         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 486         u16 w_length = le16_to_cpu(cr->wLength);
 487         u16 w_index = le16_to_cpu(cr->wIndex);
 488         u16 w_value = le16_to_cpu(cr->wValue);
 489         u8 entity_id = (w_index >> 8) & 0xff;
 490         u8 control_selector = w_value >> 8;
 491         int value = -EOPNOTSUPP;
 492
 493         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 494                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 495                 unsigned int is_playback = 0;
 496
 497                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 498                         is_playback = 1;
 499
 500                 if (control_selector == UAC_FU_VOLUME) {
 501                         __le16 r;
 502                         s16 min_db;
 503
 504                         if (is_playback)
 505                                 min_db = opts->p_volume_min;
 506                         else
 507                                 min_db = opts->c_volume_min;
 508
 509                         r = cpu_to_le16(min_db);
 510
 511                         value = min_t(unsigned int, w_length, sizeof(r));
 512                         memcpy(req->buf, &r, value);
 513                 } else {
 514                         dev_err(&audio->gadget->dev,
 515                                 "%s:%d control_selector=%d TODO!\n",
 516                                 __func__, __LINE__, control_selector);
 517                 }
 518         } else {
 519                 dev_err(&audio->gadget->dev,
 520                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 521                         __func__, __LINE__, entity_id, control_selector);
 522         }
 523
 524         return value;
 525 }
 526
 527 static int
 528 in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 529 {
 530         struct usb_request *req = fn->config->cdev->req;
 531         struct g_audio *audio = func_to_g_audio(fn);
 532         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 533         u16 w_length = le16_to_cpu(cr->wLength);
 534         u16 w_index = le16_to_cpu(cr->wIndex);
 535         u16 w_value = le16_to_cpu(cr->wValue);
 536         u8 entity_id = (w_index >> 8) & 0xff;
 537         u8 control_selector = w_value >> 8;
 538         int value = -EOPNOTSUPP;
 539
 540         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 541                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 542                 unsigned int is_playback = 0;
 543
 544                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 545                         is_playback = 1;
 546
 547                 if (control_selector == UAC_FU_VOLUME) {
 548                         __le16 r;
 549                         s16 max_db;
 550
 551                         if (is_playback)
 552                                 max_db = opts->p_volume_max;
 553                         else
 554                                 max_db = opts->c_volume_max;
 555
 556                         r = cpu_to_le16(max_db);
 557
 558                         value = min_t(unsigned int, w_length, sizeof(r));
 559                         memcpy(req->buf, &r, value);
 560                 } else {
 561                         dev_err(&audio->gadget->dev,
 562                                 "%s:%d control_selector=%d TODO!\n",
 563                                 __func__, __LINE__, control_selector);
 564                 }
 565         } else {
 566                 dev_err(&audio->gadget->dev,
 567                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 568                         __func__, __LINE__, entity_id, control_selector);
 569         }
 570
 571         return value;
 572 }
 573
 574 static int
 575 in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 576 {
 577         struct usb_request *req = fn->config->cdev->req;
 578         struct g_audio *audio = func_to_g_audio(fn);
 579         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 580         u16 w_length = le16_to_cpu(cr->wLength);
 581         u16 w_index = le16_to_cpu(cr->wIndex);
 582         u16 w_value = le16_to_cpu(cr->wValue);
 583         u8 entity_id = (w_index >> 8) & 0xff;
 584         u8 control_selector = w_value >> 8;
 585         int value = -EOPNOTSUPP;
 586
 587         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 588                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 589                 unsigned int is_playback = 0;
 590
 591                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 592                         is_playback = 1;
 593
 594                 if (control_selector == UAC_FU_VOLUME) {
 595                         __le16 r;
 596                         s16 res_db;
 597
 598                         if (is_playback)
 599                                 res_db = opts->p_volume_res;
 600                         else
 601                                 res_db = opts->c_volume_res;
 602
 603                         r = cpu_to_le16(res_db);
 604
 605                         value = min_t(unsigned int, w_length, sizeof(r));
 606                         memcpy(req->buf, &r, value);
 607                 } else {
 608                         dev_err(&audio->gadget->dev,
 609                                 "%s:%d control_selector=%d TODO!\n",
 610                                 __func__, __LINE__, control_selector);
 611                 }
 612         } else {
 613                 dev_err(&audio->gadget->dev,
 614                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 615                         __func__, __LINE__, entity_id, control_selector);
 616         }
 617
 618         return value;
 619 }
 620
 621 static void
 622 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
 623 {
 624         struct g_audio *audio = req->context;
 625         struct usb_composite_dev *cdev = audio->func.config->cdev;
 626         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 627         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 628         struct usb_ctrlrequest *cr = &uac1->setup_cr;
 629         u16 w_index = le16_to_cpu(cr->wIndex);
 630         u16 w_value = le16_to_cpu(cr->wValue);
 631         u8 entity_id = (w_index >> 8) & 0xff;
 632         u8 control_selector = w_value >> 8;
 633
 634         if (req->status != 0) {
 635                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
 636                 return;
 637         }
 638
 639         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 640                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 641                 unsigned int is_playback = 0;
 642
 643                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 644                         is_playback = 1;
 645
 646                 if (control_selector == UAC_FU_MUTE) {
 647                         u8 mute = *(u8 *)req->buf;
 648
 649                         u_audio_set_mute(audio, is_playback, mute);
 650
 651                         return;
 652                 } else if (control_selector == UAC_FU_VOLUME) {
 653                         __le16 *c = req->buf;
 654                         s16 volume;
 655
 656                         volume = le16_to_cpu(*c);
 657                         u_audio_set_volume(audio, is_playback, volume);
 658
 659                         return;
 660                 } else {
 661                         dev_err(&audio->gadget->dev,
 662                                 "%s:%d control_selector=%d TODO!\n",
 663                                 __func__, __LINE__, control_selector);
 664                         usb_ep_set_halt(ep);
 665                 }
 666         } else {
 667                 dev_err(&audio->gadget->dev,
 668                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 669                         __func__, __LINE__, entity_id, control_selector);
 670                 usb_ep_set_halt(ep);
 671
 672         }
 673 }
 674
 675 static int
 676 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 677 {
 678         struct usb_request *req = fn->config->cdev->req;
 679         struct g_audio *audio = func_to_g_audio(fn);
 680         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 681         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 682         u16 w_length = le16_to_cpu(cr->wLength);
 683         u16 w_index = le16_to_cpu(cr->wIndex);
 684         u16 w_value = le16_to_cpu(cr->wValue);
 685         u8 entity_id = (w_index >> 8) & 0xff;
 686         u8 control_selector = w_value >> 8;
 687
 688         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 689                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 690                 memcpy(&uac1->setup_cr, cr, sizeof(*cr));
 691                 req->context = audio;
 692                 req->complete = out_rq_cur_complete;
 693
 694                 return w_length;
 695         } else {
 696                 dev_err(&audio->gadget->dev,
 697                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 698                         __func__, __LINE__, entity_id, control_selector);
 699         }
 700         return -EOPNOTSUPP;
 701 }
 702
 703 static int ac_rq_in(struct usb_function *f,
 704                 const struct usb_ctrlrequest *ctrl)
 705 {
 706         struct usb_composite_dev *cdev = f->config->cdev;
 707         int value = -EOPNOTSUPP;
 708         u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 709         u16 len = le16_to_cpu(ctrl->wLength);
 710         u16 w_value = le16_to_cpu(ctrl->wValue);
 711
 712         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 713                         ctrl->bRequest, w_value, len, ep);
 714
 715         switch (ctrl->bRequest) {
 716         case UAC_GET_CUR:
 717                 return in_rq_cur(f, ctrl);
 718         case UAC_GET_MIN:
 719                 return in_rq_min(f, ctrl);
 720         case UAC_GET_MAX:
 721                 return in_rq_max(f, ctrl);
 722         case UAC_GET_RES:
 723                 return in_rq_res(f, ctrl);
 724         case UAC_GET_MEM:
 725                 break;
 726         case UAC_GET_STAT:
 727                 value = len;
 728                 break;
 729         default:
 730                 break;
 731         }
 732
 733         return value;
 734 }
 735
 736 static int audio_set_endpoint_req(struct usb_function *f,
 737                 const struct usb_ctrlrequest *ctrl)
 738 {
 739         struct usb_composite_dev *cdev = f->config->cdev;
 740         struct usb_request      *req = f->config->cdev->req;
 741         struct f_uac1           *uac1 = func_to_uac1(f);
 742         int                     value = -EOPNOTSUPP;
 743         u16                     ep = le16_to_cpu(ctrl->wIndex);
 744         u16                     len = le16_to_cpu(ctrl->wLength);
 745         u16                     w_value = le16_to_cpu(ctrl->wValue);
 746         u8                      cs = w_value >> 8;
 747
 748         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 749                         ctrl->bRequest, w_value, len, ep);
 750
 751         switch (ctrl->bRequest) {
 752         case UAC_SET_CUR: {
 753                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 754                         cdev->gadget->ep0->driver_data = f;
 755                         uac1->ctl_id = ep;
 756                         req->complete = uac_cs_attr_sample_rate;
 757                 }
 758                 value = len;
 759                 break;
 760         }
 761
 762         case UAC_SET_MIN:
 763                 break;
 764
 765         case UAC_SET_MAX:
 766                 break;
 767
 768         case UAC_SET_RES:
 769                 break;
 770
 771         case UAC_SET_MEM:
 772                 break;
 773
 774         default:
 775                 break;
 776         }
 777
 778         return value;
 779 }
 780
 781 static int audio_get_endpoint_req(struct usb_function *f,
 782                 const struct usb_ctrlrequest *ctrl)
 783 {
 784         struct usb_composite_dev *cdev = f->config->cdev;
 785         struct usb_request *req = f->config->cdev->req;
 786         struct f_uac1 *uac1 = func_to_uac1(f);
 787         u8 *buf = (u8 *)req->buf;
 788         int value = -EOPNOTSUPP;
 789         u8 ep = le16_to_cpu(ctrl->wIndex);
 790         u16 len = le16_to_cpu(ctrl->wLength);
 791         u16 w_value = le16_to_cpu(ctrl->wValue);
 792         u8 cs = w_value >> 8;
 793         u32 val = 0;
 794
 795         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 796                         ctrl->bRequest, w_value, len, ep);
 797
 798         switch (ctrl->bRequest) {
 799         case UAC_GET_CUR: {
 800                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 801                         if (ep == (USB_DIR_IN | 2))
 802                                 val = uac1->p_srate;
 803                         else if (ep == (USB_DIR_OUT | 1))
 804                                 val = uac1->c_srate;
 805                         buf[2] = (val >> 16) & 0xff;
 806                         buf[1] = (val >> 8) & 0xff;
 807                         buf[0] = val & 0xff;
 808                 }
 809                 value = len;
 810                 break;
 811         }
 812         case UAC_GET_MIN:
 813         case UAC_GET_MAX:
 814         case UAC_GET_RES:
 815                 value = len;
 816                 break;
 817         case UAC_GET_MEM:
 818                 break;
 819         default:
 820                 break;
 821         }
 822
 823         return value;
 824 }
 825
 826 static int
 827 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 828 {
 829         struct usb_composite_dev *cdev = f->config->cdev;
 830         struct usb_request      *req = cdev->req;
 831         int                     value = -EOPNOTSUPP;
 832         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 833         u16                     w_value = le16_to_cpu(ctrl->wValue);
 834         u16                     w_length = le16_to_cpu(ctrl->wLength);
 835
 836         /* composite driver infrastructure handles everything; interface
 837          * activation uses set_alt().
 838          */
 839         switch (ctrl->bRequestType) {
 840         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 841                 value = audio_set_endpoint_req(f, ctrl);
 842                 break;
 843
 844         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 845                 value = audio_get_endpoint_req(f, ctrl);
 846                 break;
 847         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 848                 if (ctrl->bRequest == UAC_SET_CUR)
 849                         value = out_rq_cur(f, ctrl);
 850                 break;
 851         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 852                 value = ac_rq_in(f, ctrl);
 853                 break;
 854         default:
 855                 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
 856                         ctrl->bRequestType, ctrl->bRequest,
 857                         w_value, w_index, w_length);
 858         }
 859
 860         /* respond with data transfer or status phase? */
 861         if (value >= 0) {
 862                 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
 863                         ctrl->bRequestType, ctrl->bRequest,
 864                         w_value, w_index, w_length);
 865                 req->zero = 0;
 866                 req->length = value;
 867                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
 868                 if (value < 0)
 869                         ERROR(cdev, "audio response on err %d\n", value);
 870         }
 871
 872         /* device either stalls (value < 0) or reports success */
 873         return value;
 874 }
 875
 876 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 877 {
 878         struct usb_composite_dev *cdev = f->config->cdev;
 879         struct usb_gadget *gadget = cdev->gadget;
 880         struct device *dev = &gadget->dev;
 881         struct g_audio *audio = func_to_g_audio(f);
 882         struct f_uac1 *uac1 = func_to_uac1(f);
 883         int ret = 0;
 884
 885         /* No i/f has more than 2 alt settings */
 886         if (alt > 1) {
 887                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 888                 return -EINVAL;
 889         }
 890
 891         if (intf == uac1->ac_intf) {
 892                 /* Control I/f has only 1 AltSetting - 0 */
 893                 if (alt) {
 894                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 895                         return -EINVAL;
 896                 }
 897
 898                 /* restart interrupt endpoint */
 899                 if (uac1->int_ep) {
 900                         usb_ep_disable(uac1->int_ep);
 901                         config_ep_by_speed(gadget, &audio->func, uac1->int_ep);
 902                         usb_ep_enable(uac1->int_ep);
 903                 }
 904
 905                 return 0;
 906         }
 907
 908         if (intf == uac1->as_out_intf) {
 909                 uac1->as_out_alt = alt;
 910
 911                 if (alt)
 912                         ret = u_audio_start_capture(&uac1->g_audio);
 913                 else
 914                         u_audio_stop_capture(&uac1->g_audio);
 915         } else if (intf == uac1->as_in_intf) {
 916                 uac1->as_in_alt = alt;
 917
 918                 if (alt)
 919                         ret = u_audio_start_playback(&uac1->g_audio);
 920                 else
 921                         u_audio_stop_playback(&uac1->g_audio);
 922         } else {
 923                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 924                 return -EINVAL;
 925         }
 926
 927         return ret;
 928 }
 929
 930 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
 931 {
 932         struct usb_composite_dev *cdev = f->config->cdev;
 933         struct usb_gadget *gadget = cdev->gadget;
 934         struct device *dev = &gadget->dev;
 935         struct f_uac1 *uac1 = func_to_uac1(f);
 936
 937         if (intf == uac1->ac_intf)
 938                 return uac1->ac_alt;
 939         else if (intf == uac1->as_out_intf)
 940                 return uac1->as_out_alt;
 941         else if (intf == uac1->as_in_intf)
 942                 return uac1->as_in_alt;
 943         else
 944                 dev_err(dev, "%s:%d Invalid Interface %d!\n",
 945                         __func__, __LINE__, intf);
 946
 947         return -EINVAL;
 948 }
 949
 950
 951 static void f_audio_disable(struct usb_function *f)
 952 {
 953         struct f_uac1 *uac1 = func_to_uac1(f);
 954
 955         uac1->as_out_alt = 0;
 956         uac1->as_in_alt = 0;
 957
 958         u_audio_stop_playback(&uac1->g_audio);
 959         u_audio_stop_capture(&uac1->g_audio);
 960         if (uac1->int_ep)
 961                 usb_ep_disable(uac1->int_ep);
 962 }
 963
 964 static void
 965 f_audio_suspend(struct usb_function *f)
 966 {
 967         struct f_uac1 *uac1 = func_to_uac1(f);
 968
 969         u_audio_suspend(&uac1->g_audio);
 970 }
 971
 972 /*-------------------------------------------------------------------------*/
 973 static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
 974 {
 975         struct uac_feature_unit_descriptor *fu_desc;
 976         int channels = num_channels(chmask);
 977         int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
 978
 979         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 980         if (!fu_desc)
 981                 return NULL;
 982
 983         fu_desc->bLength = fu_desc_size;
 984         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 985
 986         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 987         fu_desc->bControlSize  = 2;
 988
 989         /* bUnitID, bSourceID and bmaControls will be defined later */
 990
 991         return fu_desc;
 992 }
 993
 994 /* B.3.2  Class-Specific AC Interface Descriptor */
 995 static struct
 996 uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
 997 {
 998         struct uac1_ac_header_descriptor *ac_desc;
 999         int ac_header_desc_size;
1000         int num_ifaces = 0;
1001
1002         if (EPOUT_EN(opts))
1003                 num_ifaces++;
1004         if (EPIN_EN(opts))
1005                 num_ifaces++;
1006
1007         ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
1008
1009         ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
1010         if (!ac_desc)
1011                 return NULL;
1012
1013         ac_desc->bLength = ac_header_desc_size;
1014         ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1015         ac_desc->bDescriptorSubtype = UAC_HEADER;
1016         ac_desc->bcdADC = cpu_to_le16(0x0100);
1017         ac_desc->bInCollection = num_ifaces;
1018
1019         /* wTotalLength and baInterfaceNr will be defined later */
1020
1021         return ac_desc;
1022 }
1023
1024 /* Use macro to overcome line length limitation */
1025 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
1026
1027 static void setup_descriptor(struct f_uac1_opts *opts)
1028 {
1029         /* patch descriptors */
1030         int i = 1; /* ID's start with 1 */
1031
1032         if (EPOUT_EN(opts))
1033                 usb_out_it_desc.bTerminalID = i++;
1034         if (EPIN_EN(opts))
1035                 io_in_it_desc.bTerminalID = i++;
1036         if (EPOUT_EN(opts))
1037                 io_out_ot_desc.bTerminalID = i++;
1038         if (EPIN_EN(opts))
1039                 usb_in_ot_desc.bTerminalID = i++;
1040         if (FUOUT_EN(opts))
1041                 out_feature_unit_desc->bUnitID = i++;
1042         if (FUIN_EN(opts))
1043                 in_feature_unit_desc->bUnitID = i++;
1044
1045         if (FUIN_EN(opts)) {
1046                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
1047                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
1048         } else {
1049                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
1050         }
1051         if (FUOUT_EN(opts)) {
1052                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
1053                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
1054         } else {
1055                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
1056         }
1057
1058         as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
1059         as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
1060
1061         ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
1062
1063         if (EPIN_EN(opts)) {
1064                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1065
1066                 len += sizeof(usb_in_ot_desc);
1067                 len += sizeof(io_in_it_desc);
1068                 if (FUIN_EN(opts))
1069                         len += in_feature_unit_desc->bLength;
1070                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1071         }
1072         if (EPOUT_EN(opts)) {
1073                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1074
1075                 len += sizeof(usb_out_it_desc);
1076                 len += sizeof(io_out_ot_desc);
1077                 if (FUOUT_EN(opts))
1078                         len += out_feature_unit_desc->bLength;
1079                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1080         }
1081
1082         i = 0;
1083         f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
1084         f_audio_desc[i++] = USBDHDR(ac_header_desc);
1085
1086         if (EPOUT_EN(opts)) {
1087                 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
1088                 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
1089                 if (FUOUT_EN(opts))
1090                         f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
1091         }
1092
1093         if (EPIN_EN(opts)) {
1094                 f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
1095                 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
1096                 if (FUIN_EN(opts))
1097                         f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
1098         }
1099
1100         if (FUOUT_EN(opts) || FUIN_EN(opts))
1101                 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
1102
1103         if (EPOUT_EN(opts)) {
1104                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
1105                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
1106                 f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
1107                 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
1108                 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
1109                 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
1110         }
1111         if (EPIN_EN(opts)) {
1112                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
1113                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
1114                 f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
1115                 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
1116                 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
1117                 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
1118         }
1119         f_audio_desc[i] = NULL;
1120 }
1121
1122 static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
1123 {
1124         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
1125
1126         if (!opts->p_chmask && !opts->c_chmask) {
1127                 dev_err(dev, "Error: no playback and capture channels\n");
1128                 return -EINVAL;
1129         } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
1130                 dev_err(dev, "Error: unsupported playback channels mask\n");
1131                 return -EINVAL;
1132         } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
1133                 dev_err(dev, "Error: unsupported capture channels mask\n");
1134                 return -EINVAL;
1135         } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
1136                 dev_err(dev, "Error: incorrect playback sample size\n");
1137                 return -EINVAL;
1138         } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
1139                 dev_err(dev, "Error: incorrect capture sample size\n");
1140                 return -EINVAL;
1141         } else if (!opts->p_srates[0]) {
1142                 dev_err(dev, "Error: incorrect playback sampling rate\n");
1143                 return -EINVAL;
1144         } else if (!opts->c_srates[0]) {
1145                 dev_err(dev, "Error: incorrect capture sampling rate\n");
1146                 return -EINVAL;
1147         }
1148
1149         if (opts->p_volume_max <= opts->p_volume_min) {
1150                 dev_err(dev, "Error: incorrect playback volume max/min\n");
1151                 return -EINVAL;
1152         } else if (opts->c_volume_max <= opts->c_volume_min) {
1153                 dev_err(dev, "Error: incorrect capture volume max/min\n");
1154                 return -EINVAL;
1155         } else if (opts->p_volume_res <= 0) {
1156                 dev_err(dev, "Error: negative/zero playback volume resolution\n");
1157                 return -EINVAL;
1158         } else if (opts->c_volume_res <= 0) {
1159                 dev_err(dev, "Error: negative/zero capture volume resolution\n");
1160                 return -EINVAL;
1161         }
1162
1163         if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
1164                 dev_err(dev, "Error: incorrect playback volume resolution\n");
1165                 return -EINVAL;
1166         } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
1167                 dev_err(dev, "Error: incorrect capture volume resolution\n");
1168                 return -EINVAL;
1169         }
1170
1171         return 0;
1172 }
1173
1174 /* audio function driver setup/binding */
1175 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
1176 {
1177         struct usb_composite_dev        *cdev = c->cdev;
1178         struct usb_gadget               *gadget = cdev->gadget;
1179         struct device                   *dev = &gadget->dev;
1180         struct f_uac1                   *uac1 = func_to_uac1(f);
1181         struct g_audio                  *audio = func_to_g_audio(f);
1182         struct f_uac1_opts              *audio_opts;
1183         struct usb_ep                   *ep = NULL;
1184         struct usb_string               *us;
1185         int                             ba_iface_id;
1186         int                             status;
1187         int                             idx, i;
1188
1189         status = f_audio_validate_opts(audio, dev);
1190         if (status)
1191                 return status;
1192
1193         audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1194
1195         strings_uac1[STR_AC_IF].s = audio_opts->function_name;
1196
1197         us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
1198         if (IS_ERR(us))
1199                 return PTR_ERR(us);
1200
1201         ac_header_desc = build_ac_header_desc(audio_opts);
1202         if (!ac_header_desc)
1203                 return -ENOMEM;
1204
1205         if (FUOUT_EN(audio_opts)) {
1206                 out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask);
1207                 if (!out_feature_unit_desc) {
1208                         status = -ENOMEM;
1209                         goto fail;
1210                 }
1211         }
1212         if (FUIN_EN(audio_opts)) {
1213                 in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask);
1214                 if (!in_feature_unit_desc) {
1215                         status = -ENOMEM;
1216                         goto err_free_fu;
1217                 }
1218         }
1219
1220         ac_interface_desc.iInterface = us[STR_AC_IF].id;
1221         usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
1222         usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
1223         io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
1224         as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
1225         as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
1226         io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
1227         io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
1228         usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
1229         as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
1230         as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
1231
1232         if (FUOUT_EN(audio_opts)) {
1233                 u8 *i_feature;
1234
1235                 i_feature = (u8 *)out_feature_unit_desc +
1236                                         out_feature_unit_desc->bLength - 1;
1237                 *i_feature = us[STR_FU_OUT].id;
1238         }
1239         if (FUIN_EN(audio_opts)) {
1240                 u8 *i_feature;
1241
1242                 i_feature = (u8 *)in_feature_unit_desc +
1243                                         in_feature_unit_desc->bLength - 1;
1244                 *i_feature = us[STR_FU_IN].id;
1245         }
1246
1247         /* Set channel numbers */
1248         usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1249         usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
1250         as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1251         as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
1252         as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
1253         io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1254         io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
1255         as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1256         as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
1257         as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
1258
1259         if (FUOUT_EN(audio_opts)) {
1260                 __le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0];
1261                 u32 control = 0;
1262
1263                 if (audio_opts->c_mute_present)
1264                         control |= UAC_FU_MUTE;
1265                 if (audio_opts->c_volume_present)
1266                         control |= UAC_FU_VOLUME;
1267                 *bma = cpu_to_le16(control);
1268         }
1269         if (FUIN_EN(audio_opts)) {
1270                 __le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0];
1271                 u32 control = 0;
1272
1273                 if (audio_opts->p_mute_present)
1274                         control |= UAC_FU_MUTE;
1275                 if (audio_opts->p_volume_present)
1276                         control |= UAC_FU_VOLUME;
1277                 *bma = cpu_to_le16(control);
1278         }
1279
1280         /* Set sample rates */
1281         for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1282                 if (audio_opts->c_srates[i] == 0)
1283                         break;
1284                 memcpy(as_out_type_i_desc.tSamFreq[idx++],
1285                                 &audio_opts->c_srates[i], 3);
1286         }
1287         as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1288         as_out_type_i_desc.bSamFreqType = idx;
1289
1290         for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1291                 if (audio_opts->p_srates[i] == 0)
1292                         break;
1293                 memcpy(as_in_type_i_desc.tSamFreq[idx++],
1294                                 &audio_opts->p_srates[i], 3);
1295         }
1296         as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1297         as_in_type_i_desc.bSamFreqType = idx;
1298         uac1->p_srate = audio_opts->p_srates[0];
1299         uac1->c_srate = audio_opts->c_srates[0];
1300
1301         /* allocate instance-specific interface IDs, and patch descriptors */
1302         status = usb_interface_id(c, f);
1303         if (status < 0)
1304                 goto err_free_fu;
1305         ac_interface_desc.bInterfaceNumber = status;
1306         uac1->ac_intf = status;
1307         uac1->ac_alt = 0;
1308
1309         ba_iface_id = 0;
1310
1311         if (EPOUT_EN(audio_opts)) {
1312                 status = usb_interface_id(c, f);
1313                 if (status < 0)
1314                         goto err_free_fu;
1315                 as_out_interface_alt_0_desc.bInterfaceNumber = status;
1316                 as_out_interface_alt_1_desc.bInterfaceNumber = status;
1317                 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1318                 uac1->as_out_intf = status;
1319                 uac1->as_out_alt = 0;
1320         }
1321
1322         if (EPIN_EN(audio_opts)) {
1323                 status = usb_interface_id(c, f);
1324                 if (status < 0)
1325                         goto err_free_fu;
1326                 as_in_interface_alt_0_desc.bInterfaceNumber = status;
1327                 as_in_interface_alt_1_desc.bInterfaceNumber = status;
1328                 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1329                 uac1->as_in_intf = status;
1330                 uac1->as_in_alt = 0;
1331         }
1332
1333         audio->gadget = gadget;
1334
1335         status = -ENODEV;
1336
1337         ac_interface_desc.bNumEndpoints = 0;
1338
1339         /* allocate AC interrupt endpoint */
1340         if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) {
1341                 ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc);
1342                 if (!ep)
1343                         goto err_free_fu;
1344                 uac1->int_ep = ep;
1345                 uac1->int_ep->desc = &ac_int_ep_desc;
1346
1347                 ac_interface_desc.bNumEndpoints = 1;
1348         }
1349
1350         /* allocate instance-specific endpoints */
1351         if (EPOUT_EN(audio_opts)) {
1352                 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
1353                 if (!ep)
1354                         goto err_free_fu;
1355                 audio->out_ep = ep;
1356                 audio->out_ep->desc = &as_out_ep_desc;
1357         }
1358
1359         if (EPIN_EN(audio_opts)) {
1360                 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
1361                 if (!ep)
1362                         goto err_free_fu;
1363                 audio->in_ep = ep;
1364                 audio->in_ep->desc = &as_in_ep_desc;
1365         }
1366
1367         setup_descriptor(audio_opts);
1368
1369         /* copy descriptors, and track endpoint copies */
1370         status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
1371                                         NULL);
1372         if (status)
1373                 goto err_free_fu;
1374
1375         audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
1376         audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
1377         audio->params.c_chmask = audio_opts->c_chmask;
1378         memcpy(audio->params.c_srates, audio_opts->c_srates,
1379                         sizeof(audio->params.c_srates));
1380         audio->params.c_ssize = audio_opts->c_ssize;
1381         if (FUIN_EN(audio_opts)) {
1382                 audio->params.p_fu.id = USB_IN_FU_ID;
1383                 audio->params.p_fu.mute_present = audio_opts->p_mute_present;
1384                 audio->params.p_fu.volume_present =
1385                                 audio_opts->p_volume_present;
1386                 audio->params.p_fu.volume_min = audio_opts->p_volume_min;
1387                 audio->params.p_fu.volume_max = audio_opts->p_volume_max;
1388                 audio->params.p_fu.volume_res = audio_opts->p_volume_res;
1389         }
1390         audio->params.p_chmask = audio_opts->p_chmask;
1391         memcpy(audio->params.p_srates, audio_opts->p_srates,
1392                         sizeof(audio->params.p_srates));
1393         audio->params.p_ssize = audio_opts->p_ssize;
1394         if (FUOUT_EN(audio_opts)) {
1395                 audio->params.c_fu.id = USB_OUT_FU_ID;
1396                 audio->params.c_fu.mute_present = audio_opts->c_mute_present;
1397                 audio->params.c_fu.volume_present =
1398                                 audio_opts->c_volume_present;
1399                 audio->params.c_fu.volume_min = audio_opts->c_volume_min;
1400                 audio->params.c_fu.volume_max = audio_opts->c_volume_max;
1401                 audio->params.c_fu.volume_res = audio_opts->c_volume_res;
1402         }
1403         audio->params.req_number = audio_opts->req_number;
1404         audio->params.fb_max = FBACK_FAST_MAX;
1405         if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts))
1406                 audio->notify = audio_notify;
1407
1408         status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
1409         if (status)
1410                 goto err_card_register;
1411
1412         return 0;
1413
1414 err_card_register:
1415         usb_free_all_descriptors(f);
1416 err_free_fu:
1417         kfree(out_feature_unit_desc);
1418         out_feature_unit_desc = NULL;
1419         kfree(in_feature_unit_desc);
1420         in_feature_unit_desc = NULL;
1421 fail:
1422         kfree(ac_header_desc);
1423         ac_header_desc = NULL;
1424         return status;
1425 }
1426
1427 /*-------------------------------------------------------------------------*/
1428
1429 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
1430 {
1431         return container_of(to_config_group(item), struct f_uac1_opts,
1432                             func_inst.group);
1433 }
1434
1435 static void f_uac1_attr_release(struct config_item *item)
1436 {
1437         struct f_uac1_opts *opts = to_f_uac1_opts(item);
1438
1439         usb_put_function_instance(&opts->func_inst);
1440 }
1441
1442 static struct configfs_item_operations f_uac1_item_ops = {
1443         .release        = f_uac1_attr_release,
1444 };
1445
1446 #define uac1_kstrtou32                  kstrtou32
1447 #define uac1_kstrtos16                  kstrtos16
1448 #define uac1_kstrtobool(s, base, res)   kstrtobool((s), (res))
1449
1450 static const char *u32_fmt = "%u\n";
1451 static const char *s16_fmt = "%hd\n";
1452 static const char *bool_fmt = "%u\n";
1453
1454 #define UAC1_ATTRIBUTE(type, name)                                      \
1455 static ssize_t f_uac1_opts_##name##_show(                               \
1456                                           struct config_item *item,     \
1457                                           char *page)                   \
1458 {                                                                       \
1459         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1460         int result;                                                     \
1461                                                                         \
1462         mutex_lock(&opts->lock);                                        \
1463         result = sprintf(page, type##_fmt, opts->name);                 \
1464         mutex_unlock(&opts->lock);                                      \
1465                                                                         \
1466         return result;                                                  \
1467 }                                                                       \
1468                                                                         \
1469 static ssize_t f_uac1_opts_##name##_store(                              \
1470                                           struct config_item *item,     \
1471                                           const char *page, size_t len) \
1472 {                                                                       \
1473         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1474         int ret;                                                        \
1475         type num;                                                       \
1476                                                                         \
1477         mutex_lock(&opts->lock);                                        \
1478         if (opts->refcnt) {                                             \
1479                 ret = -EBUSY;                                           \
1480                 goto end;                                               \
1481         }                                                               \
1482                                                                         \
1483         ret = uac1_kstrto##type(page, 0, &num);                         \
1484         if (ret)                                                        \
1485                 goto end;                                               \
1486                                                                         \
1487         opts->name = num;                                               \
1488         ret = len;                                                      \
1489                                                                         \
1490 end:                                                                    \
1491         mutex_unlock(&opts->lock);                                      \
1492         return ret;                                                     \
1493 }                                                                       \
1494                                                                         \
1495 CONFIGFS_ATTR(f_uac1_opts_, name)
1496
1497 #define UAC1_RATE_ATTRIBUTE(name)                                       \
1498 static ssize_t f_uac1_opts_##name##_show(struct config_item *item,      \
1499                                          char *page)                    \
1500 {                                                                       \
1501         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1502         int result = 0;                                                 \
1503         int i;                                                          \
1504                                                                         \
1505         mutex_lock(&opts->lock);                                        \
1506         page[0] = '\0';                                                 \
1507         for (i = 0; i < UAC_MAX_RATES; i++) {                           \
1508                 if (opts->name##s[i] == 0)                              \
1509                         break;                                          \
1510                 result += sprintf(page + strlen(page), "%u,",           \
1511                                 opts->name##s[i]);                      \
1512         }                                                               \
1513         if (strlen(page) > 0)                                           \
1514                 page[strlen(page) - 1] = '\n';                          \
1515         mutex_unlock(&opts->lock);                                      \
1516                                                                         \
1517         return result;                                                  \
1518 }                                                                       \
1519                                                                         \
1520 static ssize_t f_uac1_opts_##name##_store(struct config_item *item,     \
1521                                           const char *page, size_t len) \
1522 {                                                                       \
1523         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1524         char *split_page = NULL;                                        \
1525         int ret = -EINVAL;                                              \
1526         char *token;                                                    \
1527         u32 num;                                                        \
1528         int i;                                                          \
1529                                                                         \
1530         mutex_lock(&opts->lock);                                        \
1531         if (opts->refcnt) {                                             \
1532                 ret = -EBUSY;                                           \
1533                 goto end;                                               \
1534         }                                                               \
1535                                                                         \
1536         i = 0;                                                          \
1537         memset(opts->name##s, 0x00, sizeof(opts->name##s));             \
1538         split_page = kstrdup(page, GFP_KERNEL);                         \
1539         while ((token = strsep(&split_page, ",")) != NULL) {            \
1540                 ret = kstrtou32(token, 0, &num);                        \
1541                 if (ret)                                                \
1542                         goto end;                                       \
1543                                                                         \
1544                 opts->name##s[i++] = num;                               \
1545                 ret = len;                                              \
1546         };                                                              \
1547                                                                         \
1548 end:                                                                    \
1549         kfree(split_page);                                              \
1550         mutex_unlock(&opts->lock);                                      \
1551         return ret;                                                     \
1552 }                                                                       \
1553                                                                         \
1554 CONFIGFS_ATTR(f_uac1_opts_, name)
1555
1556 #define UAC1_ATTRIBUTE_STRING(name)                                     \
1557 static ssize_t f_uac1_opts_##name##_show(struct config_item *item,      \
1558                                          char *page)                    \
1559 {                                                                       \
1560         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1561         int result;                                                     \
1562                                                                         \
1563         mutex_lock(&opts->lock);                                        \
1564         result = snprintf(page, sizeof(opts->name), "%s", opts->name);  \
1565         mutex_unlock(&opts->lock);                                      \
1566                                                                         \
1567         return result;                                                  \
1568 }                                                                       \
1569                                                                         \
1570 static ssize_t f_uac1_opts_##name##_store(struct config_item *item,     \
1571                                           const char *page, size_t len) \
1572 {                                                                       \
1573         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1574         int ret = 0;                                                    \
1575                                                                         \
1576         mutex_lock(&opts->lock);                                        \
1577         if (opts->refcnt) {                                             \
1578                 ret = -EBUSY;                                           \
1579                 goto end;                                               \
1580         }                                                               \
1581                                                                         \
1582         ret = snprintf(opts->name, min(sizeof(opts->name), len),        \
1583                         "%s", page);                                    \
1584                                                                         \
1585 end:                                                                    \
1586         mutex_unlock(&opts->lock);                                      \
1587         return ret;                                                     \
1588 }                                                                       \
1589                                                                         \
1590 CONFIGFS_ATTR(f_uac1_opts_, name)
1591
1592 UAC1_ATTRIBUTE(u32, c_chmask);
1593 UAC1_RATE_ATTRIBUTE(c_srate);
1594 UAC1_ATTRIBUTE(u32, c_ssize);
1595 UAC1_ATTRIBUTE(u32, p_chmask);
1596 UAC1_RATE_ATTRIBUTE(p_srate);
1597 UAC1_ATTRIBUTE(u32, p_ssize);
1598 UAC1_ATTRIBUTE(u32, req_number);
1599
1600 UAC1_ATTRIBUTE(bool, p_mute_present);
1601 UAC1_ATTRIBUTE(bool, p_volume_present);
1602 UAC1_ATTRIBUTE(s16, p_volume_min);
1603 UAC1_ATTRIBUTE(s16, p_volume_max);
1604 UAC1_ATTRIBUTE(s16, p_volume_res);
1605
1606 UAC1_ATTRIBUTE(bool, c_mute_present);
1607 UAC1_ATTRIBUTE(bool, c_volume_present);
1608 UAC1_ATTRIBUTE(s16, c_volume_min);
1609 UAC1_ATTRIBUTE(s16, c_volume_max);
1610 UAC1_ATTRIBUTE(s16, c_volume_res);
1611 UAC1_ATTRIBUTE_STRING(function_name);
1612
1613 static struct configfs_attribute *f_uac1_attrs[] = {
1614         &f_uac1_opts_attr_c_chmask,
1615         &f_uac1_opts_attr_c_srate,
1616         &f_uac1_opts_attr_c_ssize,
1617         &f_uac1_opts_attr_p_chmask,
1618         &f_uac1_opts_attr_p_srate,
1619         &f_uac1_opts_attr_p_ssize,
1620         &f_uac1_opts_attr_req_number,
1621
1622         &f_uac1_opts_attr_p_mute_present,
1623         &f_uac1_opts_attr_p_volume_present,
1624         &f_uac1_opts_attr_p_volume_min,
1625         &f_uac1_opts_attr_p_volume_max,
1626         &f_uac1_opts_attr_p_volume_res,
1627
1628         &f_uac1_opts_attr_c_mute_present,
1629         &f_uac1_opts_attr_c_volume_present,
1630         &f_uac1_opts_attr_c_volume_min,
1631         &f_uac1_opts_attr_c_volume_max,
1632         &f_uac1_opts_attr_c_volume_res,
1633
1634         &f_uac1_opts_attr_function_name,
1635
1636         NULL,
1637 };
1638
1639 static const struct config_item_type f_uac1_func_type = {
1640         .ct_item_ops    = &f_uac1_item_ops,
1641         .ct_attrs       = f_uac1_attrs,
1642         .ct_owner       = THIS_MODULE,
1643 };
1644
1645 static void f_audio_free_inst(struct usb_function_instance *f)
1646 {
1647         struct f_uac1_opts *opts;
1648
1649         opts = container_of(f, struct f_uac1_opts, func_inst);
1650         kfree(opts);
1651 }
1652
1653 static struct usb_function_instance *f_audio_alloc_inst(void)
1654 {
1655         struct f_uac1_opts *opts;
1656
1657         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1658         if (!opts)
1659                 return ERR_PTR(-ENOMEM);
1660
1661         mutex_init(&opts->lock);
1662         opts->func_inst.free_func_inst = f_audio_free_inst;
1663
1664         config_group_init_type_name(&opts->func_inst.group, "",
1665                                     &f_uac1_func_type);
1666
1667         opts->c_chmask = UAC1_DEF_CCHMASK;
1668         opts->c_srates[0] = UAC1_DEF_CSRATE;
1669         opts->c_ssize = UAC1_DEF_CSSIZE;
1670         opts->p_chmask = UAC1_DEF_PCHMASK;
1671         opts->p_srates[0] = UAC1_DEF_PSRATE;
1672         opts->p_ssize = UAC1_DEF_PSSIZE;
1673
1674         opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
1675         opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
1676         opts->p_volume_min = UAC1_DEF_MIN_DB;
1677         opts->p_volume_max = UAC1_DEF_MAX_DB;
1678         opts->p_volume_res = UAC1_DEF_RES_DB;
1679
1680         opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
1681         opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
1682         opts->c_volume_min = UAC1_DEF_MIN_DB;
1683         opts->c_volume_max = UAC1_DEF_MAX_DB;
1684         opts->c_volume_res = UAC1_DEF_RES_DB;
1685
1686         opts->req_number = UAC1_DEF_REQ_NUM;
1687
1688         snprintf(opts->function_name, sizeof(opts->function_name), "AC Interface");
1689
1690         return &opts->func_inst;
1691 }
1692
1693 static void f_audio_free(struct usb_function *f)
1694 {
1695         struct g_audio *audio;
1696         struct f_uac1_opts *opts;
1697
1698         audio = func_to_g_audio(f);
1699         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1700         kfree(audio);
1701         mutex_lock(&opts->lock);
1702         --opts->refcnt;
1703         mutex_unlock(&opts->lock);
1704 }
1705
1706 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1707 {
1708         struct g_audio *audio = func_to_g_audio(f);
1709
1710         g_audio_cleanup(audio);
1711         usb_free_all_descriptors(f);
1712
1713         kfree(out_feature_unit_desc);
1714         out_feature_unit_desc = NULL;
1715         kfree(in_feature_unit_desc);
1716         in_feature_unit_desc = NULL;
1717
1718         kfree(ac_header_desc);
1719         ac_header_desc = NULL;
1720
1721         audio->gadget = NULL;
1722 }
1723
1724 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1725 {
1726         struct f_uac1 *uac1;
1727         struct f_uac1_opts *opts;
1728
1729         /* allocate and initialize one new instance */
1730         uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
1731         if (!uac1)
1732                 return ERR_PTR(-ENOMEM);
1733
1734         opts = container_of(fi, struct f_uac1_opts, func_inst);
1735         mutex_lock(&opts->lock);
1736         ++opts->refcnt;
1737         mutex_unlock(&opts->lock);
1738
1739         uac1->g_audio.func.name = "uac1_func";
1740         uac1->g_audio.func.bind = f_audio_bind;
1741         uac1->g_audio.func.unbind = f_audio_unbind;
1742         uac1->g_audio.func.set_alt = f_audio_set_alt;
1743         uac1->g_audio.func.get_alt = f_audio_get_alt;
1744         uac1->g_audio.func.setup = f_audio_setup;
1745         uac1->g_audio.func.disable = f_audio_disable;
1746         uac1->g_audio.func.suspend = f_audio_suspend;
1747         uac1->g_audio.func.free_func = f_audio_free;
1748
1749         return &uac1->g_audio.func;
1750 }
1751
1752 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
1753 MODULE_LICENSE("GPL");
1754 MODULE_AUTHOR("Ruslan Bilovol");