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 <[email protected]>
   6  * Copyright (C) 2021 Julian Scheel <[email protected]>
   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 <[email protected]>
  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 /* Standard ISO OUT Endpoint Descriptor */
 296 static struct usb_endpoint_descriptor ss_as_out_ep_desc  = {
 297         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 298         .bDescriptorType =      USB_DT_ENDPOINT,
 299         .bEndpointAddress =     USB_DIR_OUT,
 300         .bmAttributes =         USB_ENDPOINT_SYNC_ADAPTIVE
 301                                 | USB_ENDPOINT_XFER_ISOC,
 302         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 303         .bInterval =            4,
 304 };
 305
 306 static struct usb_ss_ep_comp_descriptor ss_as_out_ep_desc_comp = {
 307         .bLength                = sizeof(ss_as_out_ep_desc_comp),
 308         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 309         .bMaxBurst              = 0,
 310         .bmAttributes           = 0,
 311         /* wBytesPerInterval = DYNAMIC */
 312 };
 313
 314 /* Standard ISO OUT Endpoint Descriptor */
 315 static struct usb_endpoint_descriptor ss_as_in_ep_desc  = {
 316         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 317         .bDescriptorType =      USB_DT_ENDPOINT,
 318         .bEndpointAddress =     USB_DIR_IN,
 319         .bmAttributes =         USB_ENDPOINT_SYNC_ASYNC
 320                                 | USB_ENDPOINT_XFER_ISOC,
 321         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 322         .bInterval =            4,
 323 };
 324
 325 static struct usb_ss_ep_comp_descriptor ss_as_in_ep_desc_comp = {
 326         .bLength                = sizeof(ss_as_in_ep_desc_comp),
 327         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 328         .bMaxBurst              = 0,
 329         .bmAttributes           = 0,
 330         /* wBytesPerInterval = DYNAMIC */
 331 };
 332
 333 static struct usb_descriptor_header *f_audio_ss_desc[] = {
 334         (struct usb_descriptor_header *)&ac_interface_desc,
 335         (struct usb_descriptor_header *)&ac_header_desc,
 336
 337         (struct usb_descriptor_header *)&usb_out_it_desc,
 338         (struct usb_descriptor_header *)&io_out_ot_desc,
 339         (struct usb_descriptor_header *)&io_in_it_desc,
 340         (struct usb_descriptor_header *)&usb_in_ot_desc,
 341
 342         (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
 343         (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
 344         (struct usb_descriptor_header *)&as_out_header_desc,
 345
 346         (struct usb_descriptor_header *)&as_out_type_i_desc,
 347
 348         //(struct usb_descriptor_header *)&as_out_ep_desc,
 349         (struct usb_descriptor_header *)&ss_as_out_ep_desc,
 350         (struct usb_descriptor_header *)&ss_as_out_ep_desc_comp,
 351         (struct usb_descriptor_header *)&as_iso_out_desc,
 352
 353         (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
 354         (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
 355         (struct usb_descriptor_header *)&as_in_header_desc,
 356
 357         (struct usb_descriptor_header *)&as_in_type_i_desc,
 358
 359         //(struct usb_descriptor_header *)&as_in_ep_desc,
 360         (struct usb_descriptor_header *)&ss_as_in_ep_desc,
 361         (struct usb_descriptor_header *)&ss_as_in_ep_desc_comp,
 362         (struct usb_descriptor_header *)&as_iso_in_desc,
 363         NULL,
 364 };
 365
 366 enum {
 367         STR_AC_IF,
 368         STR_USB_OUT_IT,
 369         STR_USB_OUT_IT_CH_NAMES,
 370         STR_IO_OUT_OT,
 371         STR_IO_IN_IT,
 372         STR_IO_IN_IT_CH_NAMES,
 373         STR_USB_IN_OT,
 374         STR_FU_IN,
 375         STR_FU_OUT,
 376         STR_AS_OUT_IF_ALT0,
 377         STR_AS_OUT_IF_ALT1,
 378         STR_AS_IN_IF_ALT0,
 379         STR_AS_IN_IF_ALT1,
 380         NUM_STR_DESCRIPTORS,
 381 };
 382
 383 static struct usb_string strings_uac1[NUM_STR_DESCRIPTORS + 1] = {};
 384
 385 static struct usb_gadget_strings str_uac1 = {
 386         .language = 0x0409,     /* en-us */
 387         .strings = strings_uac1,
 388 };
 389
 390 static struct usb_gadget_strings *uac1_strings[] = {
 391         &str_uac1,
 392         NULL,
 393 };
 394
 395 /*
 396  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
 397  */
 398
 399 static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
 400 {
 401         struct usb_function *fn = ep->driver_data;
 402         struct usb_composite_dev *cdev = fn->config->cdev;
 403         struct g_audio *agdev = func_to_g_audio(fn);
 404         struct f_uac1 *uac1 = func_to_uac1(fn);
 405         u8 *buf = (u8 *)req->buf;
 406         u32 val = 0;
 407
 408         if (req->actual != 3) {
 409                 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
 410                 return;
 411         }
 412
 413         val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
 414         if (uac1->ctl_id == (USB_DIR_IN | 2)) {
 415                 uac1->p_srate = val;
 416                 u_audio_set_playback_srate(agdev, uac1->p_srate);
 417         } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
 418                 uac1->c_srate = val;
 419                 u_audio_set_capture_srate(agdev, uac1->c_srate);
 420         }
 421 }
 422
 423 static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
 424 {
 425         struct g_audio *audio = req->context;
 426         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 427
 428         atomic_dec(&uac1->int_count);
 429         kfree(req->buf);
 430         usb_ep_free_request(_ep, req);
 431 }
 432
 433 static int audio_notify(struct g_audio *audio, int unit_id, int cs)
 434 {
 435         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 436         struct usb_request *req;
 437         struct uac1_status_word *msg;
 438         int ret;
 439
 440         if (!uac1->int_ep->enabled)
 441                 return 0;
 442
 443         if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
 444                 atomic_dec(&uac1->int_count);
 445                 return 0;
 446         }
 447
 448         req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC);
 449         if (req == NULL) {
 450                 ret = -ENOMEM;
 451                 goto err_dec_int_count;
 452         }
 453
 454         msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
 455         if (msg == NULL) {
 456                 ret = -ENOMEM;
 457                 goto err_free_request;
 458         }
 459
 460         msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
 461                                 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
 462         msg->bOriginator = unit_id;
 463
 464         req->length = sizeof(*msg);
 465         req->buf = msg;
 466         req->context = audio;
 467         req->complete = audio_notify_complete;
 468
 469         ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC);
 470
 471         if (ret)
 472                 goto err_free_msg;
 473
 474         return 0;
 475
 476 err_free_msg:
 477         kfree(msg);
 478 err_free_request:
 479         usb_ep_free_request(uac1->int_ep, req);
 480 err_dec_int_count:
 481         atomic_dec(&uac1->int_count);
 482
 483         return ret;
 484 }
 485
 486 static int
 487 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 488 {
 489         struct usb_request *req = fn->config->cdev->req;
 490         struct g_audio *audio = func_to_g_audio(fn);
 491         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 492         u16 w_length = le16_to_cpu(cr->wLength);
 493         u16 w_index = le16_to_cpu(cr->wIndex);
 494         u16 w_value = le16_to_cpu(cr->wValue);
 495         u8 entity_id = (w_index >> 8) & 0xff;
 496         u8 control_selector = w_value >> 8;
 497         int value = -EOPNOTSUPP;
 498
 499         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 500                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 501                 unsigned int is_playback = 0;
 502
 503                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 504                         is_playback = 1;
 505
 506                 if (control_selector == UAC_FU_MUTE) {
 507                         unsigned int mute;
 508
 509                         u_audio_get_mute(audio, is_playback, &mute);
 510
 511                         *(u8 *)req->buf = mute;
 512                         value = min_t(unsigned int, w_length, 1);
 513                 } else if (control_selector == UAC_FU_VOLUME) {
 514                         __le16 c;
 515                         s16 volume;
 516
 517                         u_audio_get_volume(audio, is_playback, &volume);
 518
 519                         c = cpu_to_le16(volume);
 520
 521                         value = min_t(unsigned int, w_length, sizeof(c));
 522                         memcpy(req->buf, &c, value);
 523                 } else {
 524                         dev_err(&audio->gadget->dev,
 525                                 "%s:%d control_selector=%d TODO!\n",
 526                                 __func__, __LINE__, control_selector);
 527                 }
 528         } else {
 529                 dev_err(&audio->gadget->dev,
 530                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 531                         __func__, __LINE__, entity_id, control_selector);
 532         }
 533
 534         return value;
 535 }
 536
 537 static int
 538 in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 539 {
 540         struct usb_request *req = fn->config->cdev->req;
 541         struct g_audio *audio = func_to_g_audio(fn);
 542         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 543         u16 w_length = le16_to_cpu(cr->wLength);
 544         u16 w_index = le16_to_cpu(cr->wIndex);
 545         u16 w_value = le16_to_cpu(cr->wValue);
 546         u8 entity_id = (w_index >> 8) & 0xff;
 547         u8 control_selector = w_value >> 8;
 548         int value = -EOPNOTSUPP;
 549
 550         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 551                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 552                 unsigned int is_playback = 0;
 553
 554                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 555                         is_playback = 1;
 556
 557                 if (control_selector == UAC_FU_VOLUME) {
 558                         __le16 r;
 559                         s16 min_db;
 560
 561                         if (is_playback)
 562                                 min_db = opts->p_volume_min;
 563                         else
 564                                 min_db = opts->c_volume_min;
 565
 566                         r = cpu_to_le16(min_db);
 567
 568                         value = min_t(unsigned int, w_length, sizeof(r));
 569                         memcpy(req->buf, &r, value);
 570                 } else {
 571                         dev_err(&audio->gadget->dev,
 572                                 "%s:%d control_selector=%d TODO!\n",
 573                                 __func__, __LINE__, control_selector);
 574                 }
 575         } else {
 576                 dev_err(&audio->gadget->dev,
 577                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 578                         __func__, __LINE__, entity_id, control_selector);
 579         }
 580
 581         return value;
 582 }
 583
 584 static int
 585 in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 586 {
 587         struct usb_request *req = fn->config->cdev->req;
 588         struct g_audio *audio = func_to_g_audio(fn);
 589         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 590         u16 w_length = le16_to_cpu(cr->wLength);
 591         u16 w_index = le16_to_cpu(cr->wIndex);
 592         u16 w_value = le16_to_cpu(cr->wValue);
 593         u8 entity_id = (w_index >> 8) & 0xff;
 594         u8 control_selector = w_value >> 8;
 595         int value = -EOPNOTSUPP;
 596
 597         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 598                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 599                 unsigned int is_playback = 0;
 600
 601                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 602                         is_playback = 1;
 603
 604                 if (control_selector == UAC_FU_VOLUME) {
 605                         __le16 r;
 606                         s16 max_db;
 607
 608                         if (is_playback)
 609                                 max_db = opts->p_volume_max;
 610                         else
 611                                 max_db = opts->c_volume_max;
 612
 613                         r = cpu_to_le16(max_db);
 614
 615                         value = min_t(unsigned int, w_length, sizeof(r));
 616                         memcpy(req->buf, &r, value);
 617                 } else {
 618                         dev_err(&audio->gadget->dev,
 619                                 "%s:%d control_selector=%d TODO!\n",
 620                                 __func__, __LINE__, control_selector);
 621                 }
 622         } else {
 623                 dev_err(&audio->gadget->dev,
 624                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 625                         __func__, __LINE__, entity_id, control_selector);
 626         }
 627
 628         return value;
 629 }
 630
 631 static int
 632 in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 633 {
 634         struct usb_request *req = fn->config->cdev->req;
 635         struct g_audio *audio = func_to_g_audio(fn);
 636         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 637         u16 w_length = le16_to_cpu(cr->wLength);
 638         u16 w_index = le16_to_cpu(cr->wIndex);
 639         u16 w_value = le16_to_cpu(cr->wValue);
 640         u8 entity_id = (w_index >> 8) & 0xff;
 641         u8 control_selector = w_value >> 8;
 642         int value = -EOPNOTSUPP;
 643
 644         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 645                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 646                 unsigned int is_playback = 0;
 647
 648                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 649                         is_playback = 1;
 650
 651                 if (control_selector == UAC_FU_VOLUME) {
 652                         __le16 r;
 653                         s16 res_db;
 654
 655                         if (is_playback)
 656                                 res_db = opts->p_volume_res;
 657                         else
 658                                 res_db = opts->c_volume_res;
 659
 660                         r = cpu_to_le16(res_db);
 661
 662                         value = min_t(unsigned int, w_length, sizeof(r));
 663                         memcpy(req->buf, &r, value);
 664                 } else {
 665                         dev_err(&audio->gadget->dev,
 666                                 "%s:%d control_selector=%d TODO!\n",
 667                                 __func__, __LINE__, control_selector);
 668                 }
 669         } else {
 670                 dev_err(&audio->gadget->dev,
 671                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 672                         __func__, __LINE__, entity_id, control_selector);
 673         }
 674
 675         return value;
 676 }
 677
 678 static void
 679 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
 680 {
 681         struct g_audio *audio = req->context;
 682         struct usb_composite_dev *cdev = audio->func.config->cdev;
 683         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 684         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 685         struct usb_ctrlrequest *cr = &uac1->setup_cr;
 686         u16 w_index = le16_to_cpu(cr->wIndex);
 687         u16 w_value = le16_to_cpu(cr->wValue);
 688         u8 entity_id = (w_index >> 8) & 0xff;
 689         u8 control_selector = w_value >> 8;
 690
 691         if (req->status != 0) {
 692                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
 693                 return;
 694         }
 695
 696         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 697                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 698                 unsigned int is_playback = 0;
 699
 700                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 701                         is_playback = 1;
 702
 703                 if (control_selector == UAC_FU_MUTE) {
 704                         u8 mute = *(u8 *)req->buf;
 705
 706                         u_audio_set_mute(audio, is_playback, mute);
 707
 708                         return;
 709                 } else if (control_selector == UAC_FU_VOLUME) {
 710                         __le16 *c = req->buf;
 711                         s16 volume;
 712
 713                         volume = le16_to_cpu(*c);
 714                         u_audio_set_volume(audio, is_playback, volume);
 715
 716                         return;
 717                 } else {
 718                         dev_err(&audio->gadget->dev,
 719                                 "%s:%d control_selector=%d TODO!\n",
 720                                 __func__, __LINE__, control_selector);
 721                         usb_ep_set_halt(ep);
 722                 }
 723         } else {
 724                 dev_err(&audio->gadget->dev,
 725                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 726                         __func__, __LINE__, entity_id, control_selector);
 727                 usb_ep_set_halt(ep);
 728
 729         }
 730 }
 731
 732 static int
 733 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 734 {
 735         struct usb_request *req = fn->config->cdev->req;
 736         struct g_audio *audio = func_to_g_audio(fn);
 737         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 738         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 739         u16 w_length = le16_to_cpu(cr->wLength);
 740         u16 w_index = le16_to_cpu(cr->wIndex);
 741         u16 w_value = le16_to_cpu(cr->wValue);
 742         u8 entity_id = (w_index >> 8) & 0xff;
 743         u8 control_selector = w_value >> 8;
 744
 745         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 746                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 747                 memcpy(&uac1->setup_cr, cr, sizeof(*cr));
 748                 req->context = audio;
 749                 req->complete = out_rq_cur_complete;
 750
 751                 return w_length;
 752         } else {
 753                 dev_err(&audio->gadget->dev,
 754                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 755                         __func__, __LINE__, entity_id, control_selector);
 756         }
 757         return -EOPNOTSUPP;
 758 }
 759
 760 static int ac_rq_in(struct usb_function *f,
 761                 const struct usb_ctrlrequest *ctrl)
 762 {
 763         struct usb_composite_dev *cdev = f->config->cdev;
 764         int value = -EOPNOTSUPP;
 765         u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 766         u16 len = le16_to_cpu(ctrl->wLength);
 767         u16 w_value = le16_to_cpu(ctrl->wValue);
 768
 769         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 770                         ctrl->bRequest, w_value, len, ep);
 771
 772         switch (ctrl->bRequest) {
 773         case UAC_GET_CUR:
 774                 return in_rq_cur(f, ctrl);
 775         case UAC_GET_MIN:
 776                 return in_rq_min(f, ctrl);
 777         case UAC_GET_MAX:
 778                 return in_rq_max(f, ctrl);
 779         case UAC_GET_RES:
 780                 return in_rq_res(f, ctrl);
 781         case UAC_GET_MEM:
 782                 break;
 783         case UAC_GET_STAT:
 784                 value = len;
 785                 break;
 786         default:
 787                 break;
 788         }
 789
 790         return value;
 791 }
 792
 793 static int audio_set_endpoint_req(struct usb_function *f,
 794                 const struct usb_ctrlrequest *ctrl)
 795 {
 796         struct usb_composite_dev *cdev = f->config->cdev;
 797         struct usb_request      *req = f->config->cdev->req;
 798         struct f_uac1           *uac1 = func_to_uac1(f);
 799         int                     value = -EOPNOTSUPP;
 800         u16                     ep = le16_to_cpu(ctrl->wIndex);
 801         u16                     len = le16_to_cpu(ctrl->wLength);
 802         u16                     w_value = le16_to_cpu(ctrl->wValue);
 803         u8                      cs = w_value >> 8;
 804
 805         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 806                         ctrl->bRequest, w_value, len, ep);
 807
 808         switch (ctrl->bRequest) {
 809         case UAC_SET_CUR: {
 810                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 811                         cdev->gadget->ep0->driver_data = f;
 812                         uac1->ctl_id = ep;
 813                         req->complete = uac_cs_attr_sample_rate;
 814                 }
 815                 value = len;
 816                 break;
 817         }
 818
 819         case UAC_SET_MIN:
 820                 break;
 821
 822         case UAC_SET_MAX:
 823                 break;
 824
 825         case UAC_SET_RES:
 826                 break;
 827
 828         case UAC_SET_MEM:
 829                 break;
 830
 831         default:
 832                 break;
 833         }
 834
 835         return value;
 836 }
 837
 838 static int audio_get_endpoint_req(struct usb_function *f,
 839                 const struct usb_ctrlrequest *ctrl)
 840 {
 841         struct usb_composite_dev *cdev = f->config->cdev;
 842         struct usb_request *req = f->config->cdev->req;
 843         struct f_uac1 *uac1 = func_to_uac1(f);
 844         u8 *buf = (u8 *)req->buf;
 845         int value = -EOPNOTSUPP;
 846         u8 ep = le16_to_cpu(ctrl->wIndex);
 847         u16 len = le16_to_cpu(ctrl->wLength);
 848         u16 w_value = le16_to_cpu(ctrl->wValue);
 849         u8 cs = w_value >> 8;
 850         u32 val = 0;
 851
 852         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 853                         ctrl->bRequest, w_value, len, ep);
 854
 855         switch (ctrl->bRequest) {
 856         case UAC_GET_CUR: {
 857                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 858                         if (ep == (USB_DIR_IN | 2))
 859                                 val = uac1->p_srate;
 860                         else if (ep == (USB_DIR_OUT | 1))
 861                                 val = uac1->c_srate;
 862                         buf[2] = (val >> 16) & 0xff;
 863                         buf[1] = (val >> 8) & 0xff;
 864                         buf[0] = val & 0xff;
 865                 }
 866                 value = len;
 867                 break;
 868         }
 869         case UAC_GET_MIN:
 870         case UAC_GET_MAX:
 871         case UAC_GET_RES:
 872                 value = len;
 873                 break;
 874         case UAC_GET_MEM:
 875                 break;
 876         default:
 877                 break;
 878         }
 879
 880         return value;
 881 }
 882
 883 static int
 884 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 885 {
 886         struct usb_composite_dev *cdev = f->config->cdev;
 887         struct usb_request      *req = cdev->req;
 888         int                     value = -EOPNOTSUPP;
 889         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 890         u16                     w_value = le16_to_cpu(ctrl->wValue);
 891         u16                     w_length = le16_to_cpu(ctrl->wLength);
 892
 893         /* composite driver infrastructure handles everything; interface
 894          * activation uses set_alt().
 895          */
 896         switch (ctrl->bRequestType) {
 897         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 898                 value = audio_set_endpoint_req(f, ctrl);
 899                 break;
 900
 901         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 902                 value = audio_get_endpoint_req(f, ctrl);
 903                 break;
 904         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 905                 if (ctrl->bRequest == UAC_SET_CUR)
 906                         value = out_rq_cur(f, ctrl);
 907                 break;
 908         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 909                 value = ac_rq_in(f, ctrl);
 910                 break;
 911         default:
 912                 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
 913                         ctrl->bRequestType, ctrl->bRequest,
 914                         w_value, w_index, w_length);
 915         }
 916
 917         /* respond with data transfer or status phase? */
 918         if (value >= 0) {
 919                 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
 920                         ctrl->bRequestType, ctrl->bRequest,
 921                         w_value, w_index, w_length);
 922                 req->zero = 0;
 923                 req->length = value;
 924                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
 925                 if (value < 0)
 926                         ERROR(cdev, "audio response on err %d\n", value);
 927         }
 928
 929         /* device either stalls (value < 0) or reports success */
 930         return value;
 931 }
 932
 933 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 934 {
 935         struct usb_composite_dev *cdev = f->config->cdev;
 936         struct usb_gadget *gadget = cdev->gadget;
 937         struct device *dev = &gadget->dev;
 938         struct g_audio *audio = func_to_g_audio(f);
 939         struct f_uac1 *uac1 = func_to_uac1(f);
 940         int ret = 0;
 941
 942         /* No i/f has more than 2 alt settings */
 943         if (alt > 1) {
 944                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 945                 return -EINVAL;
 946         }
 947
 948         if (intf == uac1->ac_intf) {
 949                 /* Control I/f has only 1 AltSetting - 0 */
 950                 if (alt) {
 951                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 952                         return -EINVAL;
 953                 }
 954
 955                 /* restart interrupt endpoint */
 956                 if (uac1->int_ep) {
 957                         usb_ep_disable(uac1->int_ep);
 958                         config_ep_by_speed(gadget, &audio->func, uac1->int_ep);
 959                         usb_ep_enable(uac1->int_ep);
 960                 }
 961
 962                 return 0;
 963         }
 964
 965         if (intf == uac1->as_out_intf) {
 966                 uac1->as_out_alt = alt;
 967
 968                 if (alt)
 969                         ret = u_audio_start_capture(&uac1->g_audio);
 970                 else
 971                         u_audio_stop_capture(&uac1->g_audio);
 972         } else if (intf == uac1->as_in_intf) {
 973                 uac1->as_in_alt = alt;
 974
 975                 if (alt)
 976                         ret = u_audio_start_playback(&uac1->g_audio);
 977                 else
 978                         u_audio_stop_playback(&uac1->g_audio);
 979         } else {
 980                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 981                 return -EINVAL;
 982         }
 983
 984         return ret;
 985 }
 986
 987 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
 988 {
 989         struct usb_composite_dev *cdev = f->config->cdev;
 990         struct usb_gadget *gadget = cdev->gadget;
 991         struct device *dev = &gadget->dev;
 992         struct f_uac1 *uac1 = func_to_uac1(f);
 993
 994         if (intf == uac1->ac_intf)
 995                 return uac1->ac_alt;
 996         else if (intf == uac1->as_out_intf)
 997                 return uac1->as_out_alt;
 998         else if (intf == uac1->as_in_intf)
 999                 return uac1->as_in_alt;
1000         else
1001                 dev_err(dev, "%s:%d Invalid Interface %d!\n",
1002                         __func__, __LINE__, intf);
1003
1004         return -EINVAL;
1005 }
1006
1007
1008 static void f_audio_disable(struct usb_function *f)
1009 {
1010         struct f_uac1 *uac1 = func_to_uac1(f);
1011
1012         uac1->as_out_alt = 0;
1013         uac1->as_in_alt = 0;
1014
1015         u_audio_stop_playback(&uac1->g_audio);
1016         u_audio_stop_capture(&uac1->g_audio);
1017         if (uac1->int_ep)
1018                 usb_ep_disable(uac1->int_ep);
1019 }
1020
1021 static void
1022 f_audio_suspend(struct usb_function *f)
1023 {
1024         struct f_uac1 *uac1 = func_to_uac1(f);
1025
1026         u_audio_suspend(&uac1->g_audio);
1027 }
1028
1029 /*-------------------------------------------------------------------------*/
1030 static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
1031 {
1032         struct uac_feature_unit_descriptor *fu_desc;
1033         int channels = num_channels(chmask);
1034         int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
1035
1036         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
1037         if (!fu_desc)
1038                 return NULL;
1039
1040         fu_desc->bLength = fu_desc_size;
1041         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1042
1043         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
1044         fu_desc->bControlSize  = 2;
1045
1046         /* bUnitID, bSourceID and bmaControls will be defined later */
1047
1048         return fu_desc;
1049 }
1050
1051 /* B.3.2  Class-Specific AC Interface Descriptor */
1052 static struct
1053 uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
1054 {
1055         struct uac1_ac_header_descriptor *ac_desc;
1056         int ac_header_desc_size;
1057         int num_ifaces = 0;
1058
1059         if (EPOUT_EN(opts))
1060                 num_ifaces++;
1061         if (EPIN_EN(opts))
1062                 num_ifaces++;
1063
1064         ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
1065
1066         ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
1067         if (!ac_desc)
1068                 return NULL;
1069
1070         ac_desc->bLength = ac_header_desc_size;
1071         ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1072         ac_desc->bDescriptorSubtype = UAC_HEADER;
1073         ac_desc->bcdADC = cpu_to_le16(0x0100);
1074         ac_desc->bInCollection = num_ifaces;
1075
1076         /* wTotalLength and baInterfaceNr will be defined later */
1077
1078         return ac_desc;
1079 }
1080
1081 /* Use macro to overcome line length limitation */
1082 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
1083
1084 static void setup_descriptor(struct f_uac1_opts *opts)
1085 {
1086         /* patch descriptors */
1087         int i = 1; /* ID's start with 1 */
1088
1089         if (EPOUT_EN(opts))
1090                 usb_out_it_desc.bTerminalID = i++;
1091         if (EPIN_EN(opts))
1092                 io_in_it_desc.bTerminalID = i++;
1093         if (EPOUT_EN(opts))
1094                 io_out_ot_desc.bTerminalID = i++;
1095         if (EPIN_EN(opts))
1096                 usb_in_ot_desc.bTerminalID = i++;
1097         if (FUOUT_EN(opts))
1098                 out_feature_unit_desc->bUnitID = i++;
1099         if (FUIN_EN(opts))
1100                 in_feature_unit_desc->bUnitID = i++;
1101
1102         if (FUIN_EN(opts)) {
1103                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
1104                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
1105         } else {
1106                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
1107         }
1108         if (FUOUT_EN(opts)) {
1109                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
1110                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
1111         } else {
1112                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
1113         }
1114
1115         as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
1116         as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
1117
1118         ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
1119
1120         if (EPIN_EN(opts)) {
1121                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1122
1123                 len += sizeof(usb_in_ot_desc);
1124                 len += sizeof(io_in_it_desc);
1125                 if (FUIN_EN(opts))
1126                         len += in_feature_unit_desc->bLength;
1127                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1128         }
1129         if (EPOUT_EN(opts)) {
1130                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1131
1132                 len += sizeof(usb_out_it_desc);
1133                 len += sizeof(io_out_ot_desc);
1134                 if (FUOUT_EN(opts))
1135                         len += out_feature_unit_desc->bLength;
1136                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1137         }
1138
1139         i = 0;
1140         f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
1141         f_audio_desc[i++] = USBDHDR(ac_header_desc);
1142
1143         if (EPOUT_EN(opts)) {
1144                 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
1145                 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
1146                 if (FUOUT_EN(opts))
1147                         f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
1148         }
1149
1150         if (EPIN_EN(opts)) {
1151                 f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
1152                 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
1153                 if (FUIN_EN(opts))
1154                         f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
1155         }
1156
1157         if (FUOUT_EN(opts) || FUIN_EN(opts))
1158                 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
1159
1160         if (EPOUT_EN(opts)) {
1161                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
1162                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
1163                 f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
1164                 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
1165                 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
1166                 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
1167         }
1168         if (EPIN_EN(opts)) {
1169                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
1170                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
1171                 f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
1172                 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
1173                 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
1174                 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
1175         }
1176         f_audio_desc[i] = NULL;
1177 }
1178
1179 static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
1180 {
1181         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
1182
1183         if (!opts->p_chmask && !opts->c_chmask) {
1184                 dev_err(dev, "Error: no playback and capture channels\n");
1185                 return -EINVAL;
1186         } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
1187                 dev_err(dev, "Error: unsupported playback channels mask\n");
1188                 return -EINVAL;
1189         } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
1190                 dev_err(dev, "Error: unsupported capture channels mask\n");
1191                 return -EINVAL;
1192         } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
1193                 dev_err(dev, "Error: incorrect playback sample size\n");
1194                 return -EINVAL;
1195         } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
1196                 dev_err(dev, "Error: incorrect capture sample size\n");
1197                 return -EINVAL;
1198         } else if (!opts->p_srates[0]) {
1199                 dev_err(dev, "Error: incorrect playback sampling rate\n");
1200                 return -EINVAL;
1201         } else if (!opts->c_srates[0]) {
1202                 dev_err(dev, "Error: incorrect capture sampling rate\n");
1203                 return -EINVAL;
1204         }
1205
1206         if (opts->p_volume_max <= opts->p_volume_min) {
1207                 dev_err(dev, "Error: incorrect playback volume max/min\n");
1208                 return -EINVAL;
1209         } else if (opts->c_volume_max <= opts->c_volume_min) {
1210                 dev_err(dev, "Error: incorrect capture volume max/min\n");
1211                 return -EINVAL;
1212         } else if (opts->p_volume_res <= 0) {
1213                 dev_err(dev, "Error: negative/zero playback volume resolution\n");
1214                 return -EINVAL;
1215         } else if (opts->c_volume_res <= 0) {
1216                 dev_err(dev, "Error: negative/zero capture volume resolution\n");
1217                 return -EINVAL;
1218         }
1219
1220         if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
1221                 dev_err(dev, "Error: incorrect playback volume resolution\n");
1222                 return -EINVAL;
1223         } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
1224                 dev_err(dev, "Error: incorrect capture volume resolution\n");
1225                 return -EINVAL;
1226         }
1227
1228         return 0;
1229 }
1230
1231 /* audio function driver setup/binding */
1232 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
1233 {
1234         struct usb_composite_dev        *cdev = c->cdev;
1235         struct usb_gadget               *gadget = cdev->gadget;
1236         struct device                   *dev = &gadget->dev;
1237         struct f_uac1                   *uac1 = func_to_uac1(f);
1238         struct g_audio                  *audio = func_to_g_audio(f);
1239         struct f_uac1_opts              *audio_opts;
1240         struct usb_ep                   *ep = NULL;
1241         struct usb_string               *us;
1242         int                             ba_iface_id;
1243         int                             status;
1244         int                             idx, i;
1245
1246         status = f_audio_validate_opts(audio, dev);
1247         if (status)
1248                 return status;
1249
1250         audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1251
1252         strings_uac1[STR_AC_IF].s = audio_opts->function_name;
1253
1254         strings_uac1[STR_USB_OUT_IT].s = audio_opts->c_it_name;
1255         strings_uac1[STR_USB_OUT_IT_CH_NAMES].s = audio_opts->c_it_ch_name;
1256         strings_uac1[STR_IO_OUT_OT].s = audio_opts->c_ot_name;
1257         strings_uac1[STR_FU_OUT].s = audio_opts->c_fu_vol_name;
1258         strings_uac1[STR_AS_OUT_IF_ALT0].s = "Playback Inactive";
1259         strings_uac1[STR_AS_OUT_IF_ALT1].s = "Playback Active";
1260
1261         strings_uac1[STR_IO_IN_IT].s = audio_opts->p_it_name;
1262         strings_uac1[STR_IO_IN_IT_CH_NAMES].s = audio_opts->p_it_ch_name;
1263         strings_uac1[STR_USB_IN_OT].s = audio_opts->p_ot_name;
1264         strings_uac1[STR_FU_IN].s = audio_opts->p_fu_vol_name;
1265         strings_uac1[STR_AS_IN_IF_ALT0].s = "Capture Inactive";
1266         strings_uac1[STR_AS_IN_IF_ALT1].s = "Capture Active";
1267
1268         us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
1269         if (IS_ERR(us))
1270                 return PTR_ERR(us);
1271
1272         ac_header_desc = build_ac_header_desc(audio_opts);
1273         if (!ac_header_desc)
1274                 return -ENOMEM;
1275
1276         if (FUOUT_EN(audio_opts)) {
1277                 out_feature_unit_desc = build_fu_desc(audio_opts->c_chmask);
1278                 if (!out_feature_unit_desc) {
1279                         status = -ENOMEM;
1280                         goto fail;
1281                 }
1282         }
1283         if (FUIN_EN(audio_opts)) {
1284                 in_feature_unit_desc = build_fu_desc(audio_opts->p_chmask);
1285                 if (!in_feature_unit_desc) {
1286                         status = -ENOMEM;
1287                         goto err_free_fu;
1288                 }
1289         }
1290
1291         ac_interface_desc.iInterface = us[STR_AC_IF].id;
1292         usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
1293         usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
1294         io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
1295         as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
1296         as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
1297         io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
1298         io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
1299         usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
1300         as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
1301         as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
1302
1303         if (FUOUT_EN(audio_opts)) {
1304                 u8 *i_feature;
1305
1306                 i_feature = (u8 *)out_feature_unit_desc +
1307                                         out_feature_unit_desc->bLength - 1;
1308                 *i_feature = us[STR_FU_OUT].id;
1309         }
1310         if (FUIN_EN(audio_opts)) {
1311                 u8 *i_feature;
1312
1313                 i_feature = (u8 *)in_feature_unit_desc +
1314                                         in_feature_unit_desc->bLength - 1;
1315                 *i_feature = us[STR_FU_IN].id;
1316         }
1317
1318         /* Set channel numbers */
1319         usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1320         usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
1321         as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
1322         as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
1323         as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
1324         io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1325         io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
1326         as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
1327         as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
1328         as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
1329
1330         if (FUOUT_EN(audio_opts)) {
1331                 __le16 *bma = (__le16 *)&out_feature_unit_desc->bmaControls[0];
1332                 u32 control = 0;
1333
1334                 if (audio_opts->c_mute_present)
1335                         control |= UAC_FU_MUTE;
1336                 if (audio_opts->c_volume_present)
1337                         control |= UAC_FU_VOLUME;
1338                 *bma = cpu_to_le16(control);
1339         }
1340         if (FUIN_EN(audio_opts)) {
1341                 __le16 *bma = (__le16 *)&in_feature_unit_desc->bmaControls[0];
1342                 u32 control = 0;
1343
1344                 if (audio_opts->p_mute_present)
1345                         control |= UAC_FU_MUTE;
1346                 if (audio_opts->p_volume_present)
1347                         control |= UAC_FU_VOLUME;
1348                 *bma = cpu_to_le16(control);
1349         }
1350
1351         /* Set sample rates */
1352         for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1353                 if (audio_opts->c_srates[i] == 0)
1354                         break;
1355                 memcpy(as_out_type_i_desc.tSamFreq[idx++],
1356                                 &audio_opts->c_srates[i], 3);
1357         }
1358         as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1359         as_out_type_i_desc.bSamFreqType = idx;
1360
1361         for (i = 0, idx = 0; i < UAC_MAX_RATES; i++) {
1362                 if (audio_opts->p_srates[i] == 0)
1363                         break;
1364                 memcpy(as_in_type_i_desc.tSamFreq[idx++],
1365                                 &audio_opts->p_srates[i], 3);
1366         }
1367         as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
1368         as_in_type_i_desc.bSamFreqType = idx;
1369         uac1->p_srate = audio_opts->p_srates[0];
1370         uac1->c_srate = audio_opts->c_srates[0];
1371
1372         /* allocate instance-specific interface IDs, and patch descriptors */
1373         status = usb_interface_id(c, f);
1374         if (status < 0)
1375                 goto err_free_fu;
1376         ac_interface_desc.bInterfaceNumber = status;
1377         uac1->ac_intf = status;
1378         uac1->ac_alt = 0;
1379
1380         ba_iface_id = 0;
1381
1382         if (EPOUT_EN(audio_opts)) {
1383                 status = usb_interface_id(c, f);
1384                 if (status < 0)
1385                         goto err_free_fu;
1386                 as_out_interface_alt_0_desc.bInterfaceNumber = status;
1387                 as_out_interface_alt_1_desc.bInterfaceNumber = status;
1388                 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1389                 uac1->as_out_intf = status;
1390                 uac1->as_out_alt = 0;
1391         }
1392
1393         if (EPIN_EN(audio_opts)) {
1394                 status = usb_interface_id(c, f);
1395                 if (status < 0)
1396                         goto err_free_fu;
1397                 as_in_interface_alt_0_desc.bInterfaceNumber = status;
1398                 as_in_interface_alt_1_desc.bInterfaceNumber = status;
1399                 ac_header_desc->baInterfaceNr[ba_iface_id++] = status;
1400                 uac1->as_in_intf = status;
1401                 uac1->as_in_alt = 0;
1402         }
1403
1404         audio->gadget = gadget;
1405
1406         status = -ENODEV;
1407
1408         ac_interface_desc.bNumEndpoints = 0;
1409
1410         /* allocate AC interrupt endpoint */
1411         if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts)) {
1412                 ep = usb_ep_autoconfig(cdev->gadget, &ac_int_ep_desc);
1413                 if (!ep)
1414                         goto err_free_fu;
1415                 uac1->int_ep = ep;
1416                 uac1->int_ep->desc = &ac_int_ep_desc;
1417
1418                 ac_interface_desc.bNumEndpoints = 1;
1419         }
1420
1421         /* allocate instance-specific endpoints */
1422         if (EPOUT_EN(audio_opts)) {
1423                 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
1424                 if (!ep)
1425                         goto err_free_fu;
1426                 ss_as_out_ep_desc.bEndpointAddress = as_out_ep_desc.bEndpointAddress;
1427                 audio->out_ep = ep;
1428                 audio->out_ep->desc = &as_out_ep_desc;
1429         }
1430
1431         if (EPIN_EN(audio_opts)) {
1432                 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
1433                 if (!ep)
1434                         goto err_free_fu;
1435                 ss_as_in_ep_desc.bEndpointAddress = as_in_ep_desc.bEndpointAddress;
1436                 audio->in_ep = ep;
1437                 audio->in_ep->desc = &as_in_ep_desc;
1438         }
1439
1440         setup_descriptor(audio_opts);
1441
1442         /* copy descriptors, and track endpoint copies */
1443         status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, f_audio_ss_desc,
1444                                         f_audio_ss_desc);
1445         if (status)
1446                 goto err_free_fu;
1447
1448         audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
1449         audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
1450         audio->params.c_chmask = audio_opts->c_chmask;
1451         memcpy(audio->params.c_srates, audio_opts->c_srates,
1452                         sizeof(audio->params.c_srates));
1453         audio->params.c_ssize = audio_opts->c_ssize;
1454         if (FUIN_EN(audio_opts)) {
1455                 audio->params.p_fu.id = USB_IN_FU_ID;
1456                 audio->params.p_fu.mute_present = audio_opts->p_mute_present;
1457                 audio->params.p_fu.volume_present =
1458                                 audio_opts->p_volume_present;
1459                 audio->params.p_fu.volume_min = audio_opts->p_volume_min;
1460                 audio->params.p_fu.volume_max = audio_opts->p_volume_max;
1461                 audio->params.p_fu.volume_res = audio_opts->p_volume_res;
1462         }
1463         audio->params.p_chmask = audio_opts->p_chmask;
1464         memcpy(audio->params.p_srates, audio_opts->p_srates,
1465                         sizeof(audio->params.p_srates));
1466         audio->params.p_ssize = audio_opts->p_ssize;
1467         if (FUOUT_EN(audio_opts)) {
1468                 audio->params.c_fu.id = USB_OUT_FU_ID;
1469                 audio->params.c_fu.mute_present = audio_opts->c_mute_present;
1470                 audio->params.c_fu.volume_present =
1471                                 audio_opts->c_volume_present;
1472                 audio->params.c_fu.volume_min = audio_opts->c_volume_min;
1473                 audio->params.c_fu.volume_max = audio_opts->c_volume_max;
1474                 audio->params.c_fu.volume_res = audio_opts->c_volume_res;
1475         }
1476         audio->params.req_number = audio_opts->req_number;
1477         audio->params.fb_max = FBACK_FAST_MAX;
1478         if (FUOUT_EN(audio_opts) || FUIN_EN(audio_opts))
1479                 audio->notify = audio_notify;
1480
1481         status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
1482         if (status)
1483                 goto err_card_register;
1484
1485         return 0;
1486
1487 err_card_register:
1488         usb_free_all_descriptors(f);
1489 err_free_fu:
1490         kfree(out_feature_unit_desc);
1491         out_feature_unit_desc = NULL;
1492         kfree(in_feature_unit_desc);
1493         in_feature_unit_desc = NULL;
1494 fail:
1495         kfree(ac_header_desc);
1496         ac_header_desc = NULL;
1497         return status;
1498 }
1499
1500 /*-------------------------------------------------------------------------*/
1501
1502 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
1503 {
1504         return container_of(to_config_group(item), struct f_uac1_opts,
1505                             func_inst.group);
1506 }
1507
1508 static void f_uac1_attr_release(struct config_item *item)
1509 {
1510         struct f_uac1_opts *opts = to_f_uac1_opts(item);
1511
1512         usb_put_function_instance(&opts->func_inst);
1513 }
1514
1515 static struct configfs_item_operations f_uac1_item_ops = {
1516         .release        = f_uac1_attr_release,
1517 };
1518
1519 #define uac1_kstrtou32                  kstrtou32
1520 #define uac1_kstrtos16                  kstrtos16
1521 #define uac1_kstrtobool(s, base, res)   kstrtobool((s), (res))
1522
1523 static const char *u32_fmt = "%u\n";
1524 static const char *s16_fmt = "%hd\n";
1525 static const char *bool_fmt = "%u\n";
1526
1527 #define UAC1_ATTRIBUTE(type, name)                                      \
1528 static ssize_t f_uac1_opts_##name##_show(                               \
1529                                           struct config_item *item,     \
1530                                           char *page)                   \
1531 {                                                                       \
1532         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1533         int result;                                                     \
1534                                                                         \
1535         mutex_lock(&opts->lock);                                        \
1536         result = sprintf(page, type##_fmt, opts->name);                 \
1537         mutex_unlock(&opts->lock);                                      \
1538                                                                         \
1539         return result;                                                  \
1540 }                                                                       \
1541                                                                         \
1542 static ssize_t f_uac1_opts_##name##_store(                              \
1543                                           struct config_item *item,     \
1544                                           const char *page, size_t len) \
1545 {                                                                       \
1546         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1547         int ret;                                                        \
1548         type num;                                                       \
1549                                                                         \
1550         mutex_lock(&opts->lock);                                        \
1551         if (opts->refcnt) {                                             \
1552                 ret = -EBUSY;                                           \
1553                 goto end;                                               \
1554         }                                                               \
1555                                                                         \
1556         ret = uac1_kstrto##type(page, 0, &num);                         \
1557         if (ret)                                                        \
1558                 goto end;                                               \
1559                                                                         \
1560         opts->name = num;                                               \
1561         ret = len;                                                      \
1562                                                                         \
1563 end:                                                                    \
1564         mutex_unlock(&opts->lock);                                      \
1565         return ret;                                                     \
1566 }                                                                       \
1567                                                                         \
1568 CONFIGFS_ATTR(f_uac1_opts_, name)
1569
1570 #define UAC1_RATE_ATTRIBUTE(name)                                       \
1571 static ssize_t f_uac1_opts_##name##_show(struct config_item *item,      \
1572                                          char *page)                    \
1573 {                                                                       \
1574         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1575         int result = 0;                                                 \
1576         int i;                                                          \
1577                                                                         \
1578         mutex_lock(&opts->lock);                                        \
1579         page[0] = '\0';                                                 \
1580         for (i = 0; i < UAC_MAX_RATES; i++) {                           \
1581                 if (opts->name##s[i] == 0)                              \
1582                         break;                                          \
1583                 result += sprintf(page + strlen(page), "%u,",           \
1584                                 opts->name##s[i]);                      \
1585         }                                                               \
1586         if (strlen(page) > 0)                                           \
1587                 page[strlen(page) - 1] = '\n';                          \
1588         mutex_unlock(&opts->lock);                                      \
1589                                                                         \
1590         return result;                                                  \
1591 }                                                                       \
1592                                                                         \
1593 static ssize_t f_uac1_opts_##name##_store(struct config_item *item,     \
1594                                           const char *page, size_t len) \
1595 {                                                                       \
1596         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1597         char *split_page = NULL;                                        \
1598         int ret = -EINVAL;                                              \
1599         char *token;                                                    \
1600         u32 num;                                                        \
1601         int i;                                                          \
1602                                                                         \
1603         mutex_lock(&opts->lock);                                        \
1604         if (opts->refcnt) {                                             \
1605                 ret = -EBUSY;                                           \
1606                 goto end;                                               \
1607         }                                                               \
1608                                                                         \
1609         i = 0;                                                          \
1610         memset(opts->name##s, 0x00, sizeof(opts->name##s));             \
1611         split_page = kstrdup(page, GFP_KERNEL);                         \
1612         while ((token = strsep(&split_page, ",")) != NULL) {            \
1613                 ret = kstrtou32(token, 0, &num);                        \
1614                 if (ret)                                                \
1615                         goto end;                                       \
1616                                                                         \
1617                 opts->name##s[i++] = num;                               \
1618                 ret = len;                                              \
1619         };                                                              \
1620                                                                         \
1621 end:                                                                    \
1622         kfree(split_page);                                              \
1623         mutex_unlock(&opts->lock);                                      \
1624         return ret;                                                     \
1625 }                                                                       \
1626                                                                         \
1627 CONFIGFS_ATTR(f_uac1_opts_, name)
1628
1629 #define UAC1_ATTRIBUTE_STRING(name)                                     \
1630 static ssize_t f_uac1_opts_##name##_show(struct config_item *item,      \
1631                                          char *page)                    \
1632 {                                                                       \
1633         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1634         int result;                                                     \
1635                                                                         \
1636         mutex_lock(&opts->lock);                                        \
1637         result = scnprintf(page, sizeof(opts->name), "%s", opts->name); \
1638         mutex_unlock(&opts->lock);                                      \
1639                                                                         \
1640         return result;                                                  \
1641 }                                                                       \
1642                                                                         \
1643 static ssize_t f_uac1_opts_##name##_store(struct config_item *item,     \
1644                                           const char *page, size_t len) \
1645 {                                                                       \
1646         struct f_uac1_opts *opts = to_f_uac1_opts(item);                \
1647         int ret = 0;                                                    \
1648                                                                         \
1649         mutex_lock(&opts->lock);                                        \
1650         if (opts->refcnt) {                                             \
1651                 ret = -EBUSY;                                           \
1652                 goto end;                                               \
1653         }                                                               \
1654                                                                         \
1655         ret = scnprintf(opts->name, min(sizeof(opts->name), len),       \
1656                         "%s", page);                                    \
1657                                                                         \
1658 end:                                                                    \
1659         mutex_unlock(&opts->lock);                                      \
1660         return ret;                                                     \
1661 }                                                                       \
1662                                                                         \
1663 CONFIGFS_ATTR(f_uac1_opts_, name)
1664
1665 UAC1_ATTRIBUTE(u32, c_chmask);
1666 UAC1_RATE_ATTRIBUTE(c_srate);
1667 UAC1_ATTRIBUTE(u32, c_ssize);
1668 UAC1_ATTRIBUTE(u32, p_chmask);
1669 UAC1_RATE_ATTRIBUTE(p_srate);
1670 UAC1_ATTRIBUTE(u32, p_ssize);
1671 UAC1_ATTRIBUTE(u32, req_number);
1672
1673 UAC1_ATTRIBUTE(bool, p_mute_present);
1674 UAC1_ATTRIBUTE(bool, p_volume_present);
1675 UAC1_ATTRIBUTE(s16, p_volume_min);
1676 UAC1_ATTRIBUTE(s16, p_volume_max);
1677 UAC1_ATTRIBUTE(s16, p_volume_res);
1678
1679 UAC1_ATTRIBUTE(bool, c_mute_present);
1680 UAC1_ATTRIBUTE(bool, c_volume_present);
1681 UAC1_ATTRIBUTE(s16, c_volume_min);
1682 UAC1_ATTRIBUTE(s16, c_volume_max);
1683 UAC1_ATTRIBUTE(s16, c_volume_res);
1684
1685 UAC1_ATTRIBUTE_STRING(function_name);
1686
1687 UAC1_ATTRIBUTE_STRING(p_it_name);
1688 UAC1_ATTRIBUTE_STRING(p_it_ch_name);
1689 UAC1_ATTRIBUTE_STRING(p_ot_name);
1690 UAC1_ATTRIBUTE_STRING(p_fu_vol_name);
1691
1692 UAC1_ATTRIBUTE_STRING(c_it_name);
1693 UAC1_ATTRIBUTE_STRING(c_it_ch_name);
1694 UAC1_ATTRIBUTE_STRING(c_ot_name);
1695 UAC1_ATTRIBUTE_STRING(c_fu_vol_name);
1696
1697 static struct configfs_attribute *f_uac1_attrs[] = {
1698         &f_uac1_opts_attr_c_chmask,
1699         &f_uac1_opts_attr_c_srate,
1700         &f_uac1_opts_attr_c_ssize,
1701         &f_uac1_opts_attr_p_chmask,
1702         &f_uac1_opts_attr_p_srate,
1703         &f_uac1_opts_attr_p_ssize,
1704         &f_uac1_opts_attr_req_number,
1705
1706         &f_uac1_opts_attr_p_mute_present,
1707         &f_uac1_opts_attr_p_volume_present,
1708         &f_uac1_opts_attr_p_volume_min,
1709         &f_uac1_opts_attr_p_volume_max,
1710         &f_uac1_opts_attr_p_volume_res,
1711
1712         &f_uac1_opts_attr_c_mute_present,
1713         &f_uac1_opts_attr_c_volume_present,
1714         &f_uac1_opts_attr_c_volume_min,
1715         &f_uac1_opts_attr_c_volume_max,
1716         &f_uac1_opts_attr_c_volume_res,
1717
1718         &f_uac1_opts_attr_function_name,
1719
1720         &f_uac1_opts_attr_p_it_name,
1721         &f_uac1_opts_attr_p_it_ch_name,
1722         &f_uac1_opts_attr_p_ot_name,
1723         &f_uac1_opts_attr_p_fu_vol_name,
1724
1725         &f_uac1_opts_attr_c_it_name,
1726         &f_uac1_opts_attr_c_it_ch_name,
1727         &f_uac1_opts_attr_c_ot_name,
1728         &f_uac1_opts_attr_c_fu_vol_name,
1729
1730         NULL,
1731 };
1732
1733 static const struct config_item_type f_uac1_func_type = {
1734         .ct_item_ops    = &f_uac1_item_ops,
1735         .ct_attrs       = f_uac1_attrs,
1736         .ct_owner       = THIS_MODULE,
1737 };
1738
1739 static void f_audio_free_inst(struct usb_function_instance *f)
1740 {
1741         struct f_uac1_opts *opts;
1742
1743         opts = container_of(f, struct f_uac1_opts, func_inst);
1744         kfree(opts);
1745 }
1746
1747 static struct usb_function_instance *f_audio_alloc_inst(void)
1748 {
1749         struct f_uac1_opts *opts;
1750
1751         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1752         if (!opts)
1753                 return ERR_PTR(-ENOMEM);
1754
1755         mutex_init(&opts->lock);
1756         opts->func_inst.free_func_inst = f_audio_free_inst;
1757
1758         config_group_init_type_name(&opts->func_inst.group, "",
1759                                     &f_uac1_func_type);
1760
1761         opts->c_chmask = UAC1_DEF_CCHMASK;
1762         opts->c_srates[0] = UAC1_DEF_CSRATE;
1763         opts->c_ssize = UAC1_DEF_CSSIZE;
1764         opts->p_chmask = UAC1_DEF_PCHMASK;
1765         opts->p_srates[0] = UAC1_DEF_PSRATE;
1766         opts->p_ssize = UAC1_DEF_PSSIZE;
1767
1768         opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
1769         opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
1770         opts->p_volume_min = UAC1_DEF_MIN_DB;
1771         opts->p_volume_max = UAC1_DEF_MAX_DB;
1772         opts->p_volume_res = UAC1_DEF_RES_DB;
1773
1774         opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
1775         opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
1776         opts->c_volume_min = UAC1_DEF_MIN_DB;
1777         opts->c_volume_max = UAC1_DEF_MAX_DB;
1778         opts->c_volume_res = UAC1_DEF_RES_DB;
1779
1780         opts->req_number = UAC1_DEF_REQ_NUM;
1781
1782         scnprintf(opts->function_name, sizeof(opts->function_name), "AC Interface");
1783
1784         scnprintf(opts->p_it_name, sizeof(opts->p_it_name), "Capture Input terminal");
1785         scnprintf(opts->p_it_ch_name, sizeof(opts->p_it_ch_name), "Capture Channels");
1786         scnprintf(opts->p_ot_name, sizeof(opts->p_ot_name), "Capture Output terminal");
1787         scnprintf(opts->p_fu_vol_name, sizeof(opts->p_fu_vol_name), "Capture Volume");
1788
1789         scnprintf(opts->c_it_name, sizeof(opts->c_it_name), "Playback Input terminal");
1790         scnprintf(opts->c_it_ch_name, sizeof(opts->c_it_ch_name), "Playback Channels");
1791         scnprintf(opts->c_ot_name, sizeof(opts->c_ot_name), "Playback Output terminal");
1792         scnprintf(opts->c_fu_vol_name, sizeof(opts->c_fu_vol_name), "Playback Volume");
1793
1794         return &opts->func_inst;
1795 }
1796
1797 static void f_audio_free(struct usb_function *f)
1798 {
1799         struct g_audio *audio;
1800         struct f_uac1_opts *opts;
1801
1802         audio = func_to_g_audio(f);
1803         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1804         kfree(audio);
1805         mutex_lock(&opts->lock);
1806         --opts->refcnt;
1807         mutex_unlock(&opts->lock);
1808 }
1809
1810 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1811 {
1812         struct g_audio *audio = func_to_g_audio(f);
1813
1814         g_audio_cleanup(audio);
1815         usb_free_all_descriptors(f);
1816
1817         kfree(out_feature_unit_desc);
1818         out_feature_unit_desc = NULL;
1819         kfree(in_feature_unit_desc);
1820         in_feature_unit_desc = NULL;
1821
1822         kfree(ac_header_desc);
1823         ac_header_desc = NULL;
1824
1825         audio->gadget = NULL;
1826 }
1827
1828 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1829 {
1830         struct f_uac1 *uac1;
1831         struct f_uac1_opts *opts;
1832
1833         /* allocate and initialize one new instance */
1834         uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
1835         if (!uac1)
1836                 return ERR_PTR(-ENOMEM);
1837
1838         opts = container_of(fi, struct f_uac1_opts, func_inst);
1839         mutex_lock(&opts->lock);
1840         ++opts->refcnt;
1841         mutex_unlock(&opts->lock);
1842
1843         uac1->g_audio.func.name = "uac1_func";
1844         uac1->g_audio.func.bind = f_audio_bind;
1845         uac1->g_audio.func.unbind = f_audio_unbind;
1846         uac1->g_audio.func.set_alt = f_audio_set_alt;
1847         uac1->g_audio.func.get_alt = f_audio_get_alt;
1848         uac1->g_audio.func.setup = f_audio_setup;
1849         uac1->g_audio.func.disable = f_audio_disable;
1850         uac1->g_audio.func.suspend = f_audio_suspend;
1851         uac1->g_audio.func.free_func = f_audio_free;
1852
1853         return &uac1->g_audio.func;
1854 }
1855
1856 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
1857 MODULE_DESCRIPTION("USB Audio Class 1.0 Function (using u_audio API)");
1858 MODULE_LICENSE("GPL");
1859 MODULE_AUTHOR("Ruslan Bilovol");