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 /* 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 };
 381
 382 static struct usb_string strings_uac1[] = {
 383         /* [STR_AC_IF].s = DYNAMIC, */
 384         [STR_USB_OUT_IT].s = "Playback Input terminal",
 385         [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
 386         [STR_IO_OUT_OT].s = "Playback Output terminal",
 387         [STR_IO_IN_IT].s = "Capture Input terminal",
 388         [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
 389         [STR_USB_IN_OT].s = "Capture Output terminal",
 390         [STR_FU_IN].s = "Capture Volume",
 391         [STR_FU_OUT].s = "Playback Volume",
 392         [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
 393         [STR_AS_OUT_IF_ALT1].s = "Playback Active",
 394         [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
 395         [STR_AS_IN_IF_ALT1].s = "Capture Active",
 396         { },
 397 };
 398
 399 static struct usb_gadget_strings str_uac1 = {
 400         .language = 0x0409,     /* en-us */
 401         .strings = strings_uac1,
 402 };
 403
 404 static struct usb_gadget_strings *uac1_strings[] = {
 405         &str_uac1,
 406         NULL,
 407 };
 408
 409 /*
 410  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
 411  */
 412
 413 static void uac_cs_attr_sample_rate(struct usb_ep *ep, struct usb_request *req)
 414 {
 415         struct usb_function *fn = ep->driver_data;
 416         struct usb_composite_dev *cdev = fn->config->cdev;
 417         struct g_audio *agdev = func_to_g_audio(fn);
 418         struct f_uac1 *uac1 = func_to_uac1(fn);
 419         u8 *buf = (u8 *)req->buf;
 420         u32 val = 0;
 421
 422         if (req->actual != 3) {
 423                 WARN(cdev, "Invalid data size for UAC_EP_CS_ATTR_SAMPLE_RATE.\n");
 424                 return;
 425         }
 426
 427         val = buf[0] | (buf[1] << 8) | (buf[2] << 16);
 428         if (uac1->ctl_id == (USB_DIR_IN | 2)) {
 429                 uac1->p_srate = val;
 430                 u_audio_set_playback_srate(agdev, uac1->p_srate);
 431         } else if (uac1->ctl_id == (USB_DIR_OUT | 1)) {
 432                 uac1->c_srate = val;
 433                 u_audio_set_capture_srate(agdev, uac1->c_srate);
 434         }
 435 }
 436
 437 static void audio_notify_complete(struct usb_ep *_ep, struct usb_request *req)
 438 {
 439         struct g_audio *audio = req->context;
 440         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 441
 442         atomic_dec(&uac1->int_count);
 443         kfree(req->buf);
 444         usb_ep_free_request(_ep, req);
 445 }
 446
 447 static int audio_notify(struct g_audio *audio, int unit_id, int cs)
 448 {
 449         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 450         struct usb_request *req;
 451         struct uac1_status_word *msg;
 452         int ret;
 453
 454         if (!uac1->int_ep->enabled)
 455                 return 0;
 456
 457         if (atomic_inc_return(&uac1->int_count) > UAC1_DEF_INT_REQ_NUM) {
 458                 atomic_dec(&uac1->int_count);
 459                 return 0;
 460         }
 461
 462         req = usb_ep_alloc_request(uac1->int_ep, GFP_ATOMIC);
 463         if (req == NULL) {
 464                 ret = -ENOMEM;
 465                 goto err_dec_int_count;
 466         }
 467
 468         msg = kmalloc(sizeof(*msg), GFP_ATOMIC);
 469         if (msg == NULL) {
 470                 ret = -ENOMEM;
 471                 goto err_free_request;
 472         }
 473
 474         msg->bStatusType = UAC1_STATUS_TYPE_IRQ_PENDING
 475                                 | UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF;
 476         msg->bOriginator = unit_id;
 477
 478         req->length = sizeof(*msg);
 479         req->buf = msg;
 480         req->context = audio;
 481         req->complete = audio_notify_complete;
 482
 483         ret = usb_ep_queue(uac1->int_ep, req, GFP_ATOMIC);
 484
 485         if (ret)
 486                 goto err_free_msg;
 487
 488         return 0;
 489
 490 err_free_msg:
 491         kfree(msg);
 492 err_free_request:
 493         usb_ep_free_request(uac1->int_ep, req);
 494 err_dec_int_count:
 495         atomic_dec(&uac1->int_count);
 496
 497         return ret;
 498 }
 499
 500 static int
 501 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 502 {
 503         struct usb_request *req = fn->config->cdev->req;
 504         struct g_audio *audio = func_to_g_audio(fn);
 505         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 506         u16 w_length = le16_to_cpu(cr->wLength);
 507         u16 w_index = le16_to_cpu(cr->wIndex);
 508         u16 w_value = le16_to_cpu(cr->wValue);
 509         u8 entity_id = (w_index >> 8) & 0xff;
 510         u8 control_selector = w_value >> 8;
 511         int value = -EOPNOTSUPP;
 512
 513         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 514                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 515                 unsigned int is_playback = 0;
 516
 517                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 518                         is_playback = 1;
 519
 520                 if (control_selector == UAC_FU_MUTE) {
 521                         unsigned int mute;
 522
 523                         u_audio_get_mute(audio, is_playback, &mute);
 524
 525                         *(u8 *)req->buf = mute;
 526                         value = min_t(unsigned int, w_length, 1);
 527                 } else if (control_selector == UAC_FU_VOLUME) {
 528                         __le16 c;
 529                         s16 volume;
 530
 531                         u_audio_get_volume(audio, is_playback, &volume);
 532
 533                         c = cpu_to_le16(volume);
 534
 535                         value = min_t(unsigned int, w_length, sizeof(c));
 536                         memcpy(req->buf, &c, value);
 537                 } else {
 538                         dev_err(&audio->gadget->dev,
 539                                 "%s:%d control_selector=%d TODO!\n",
 540                                 __func__, __LINE__, control_selector);
 541                 }
 542         } else {
 543                 dev_err(&audio->gadget->dev,
 544                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 545                         __func__, __LINE__, entity_id, control_selector);
 546         }
 547
 548         return value;
 549 }
 550
 551 static int
 552 in_rq_min(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 553 {
 554         struct usb_request *req = fn->config->cdev->req;
 555         struct g_audio *audio = func_to_g_audio(fn);
 556         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 557         u16 w_length = le16_to_cpu(cr->wLength);
 558         u16 w_index = le16_to_cpu(cr->wIndex);
 559         u16 w_value = le16_to_cpu(cr->wValue);
 560         u8 entity_id = (w_index >> 8) & 0xff;
 561         u8 control_selector = w_value >> 8;
 562         int value = -EOPNOTSUPP;
 563
 564         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 565                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 566                 unsigned int is_playback = 0;
 567
 568                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 569                         is_playback = 1;
 570
 571                 if (control_selector == UAC_FU_VOLUME) {
 572                         __le16 r;
 573                         s16 min_db;
 574
 575                         if (is_playback)
 576                                 min_db = opts->p_volume_min;
 577                         else
 578                                 min_db = opts->c_volume_min;
 579
 580                         r = cpu_to_le16(min_db);
 581
 582                         value = min_t(unsigned int, w_length, sizeof(r));
 583                         memcpy(req->buf, &r, value);
 584                 } else {
 585                         dev_err(&audio->gadget->dev,
 586                                 "%s:%d control_selector=%d TODO!\n",
 587                                 __func__, __LINE__, control_selector);
 588                 }
 589         } else {
 590                 dev_err(&audio->gadget->dev,
 591                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 592                         __func__, __LINE__, entity_id, control_selector);
 593         }
 594
 595         return value;
 596 }
 597
 598 static int
 599 in_rq_max(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 600 {
 601         struct usb_request *req = fn->config->cdev->req;
 602         struct g_audio *audio = func_to_g_audio(fn);
 603         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 604         u16 w_length = le16_to_cpu(cr->wLength);
 605         u16 w_index = le16_to_cpu(cr->wIndex);
 606         u16 w_value = le16_to_cpu(cr->wValue);
 607         u8 entity_id = (w_index >> 8) & 0xff;
 608         u8 control_selector = w_value >> 8;
 609         int value = -EOPNOTSUPP;
 610
 611         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 612                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 613                 unsigned int is_playback = 0;
 614
 615                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 616                         is_playback = 1;
 617
 618                 if (control_selector == UAC_FU_VOLUME) {
 619                         __le16 r;
 620                         s16 max_db;
 621
 622                         if (is_playback)
 623                                 max_db = opts->p_volume_max;
 624                         else
 625                                 max_db = opts->c_volume_max;
 626
 627                         r = cpu_to_le16(max_db);
 628
 629                         value = min_t(unsigned int, w_length, sizeof(r));
 630                         memcpy(req->buf, &r, value);
 631                 } else {
 632                         dev_err(&audio->gadget->dev,
 633                                 "%s:%d control_selector=%d TODO!\n",
 634                                 __func__, __LINE__, control_selector);
 635                 }
 636         } else {
 637                 dev_err(&audio->gadget->dev,
 638                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 639                         __func__, __LINE__, entity_id, control_selector);
 640         }
 641
 642         return value;
 643 }
 644
 645 static int
 646 in_rq_res(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 647 {
 648         struct usb_request *req = fn->config->cdev->req;
 649         struct g_audio *audio = func_to_g_audio(fn);
 650         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 651         u16 w_length = le16_to_cpu(cr->wLength);
 652         u16 w_index = le16_to_cpu(cr->wIndex);
 653         u16 w_value = le16_to_cpu(cr->wValue);
 654         u8 entity_id = (w_index >> 8) & 0xff;
 655         u8 control_selector = w_value >> 8;
 656         int value = -EOPNOTSUPP;
 657
 658         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 659                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 660                 unsigned int is_playback = 0;
 661
 662                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 663                         is_playback = 1;
 664
 665                 if (control_selector == UAC_FU_VOLUME) {
 666                         __le16 r;
 667                         s16 res_db;
 668
 669                         if (is_playback)
 670                                 res_db = opts->p_volume_res;
 671                         else
 672                                 res_db = opts->c_volume_res;
 673
 674                         r = cpu_to_le16(res_db);
 675
 676                         value = min_t(unsigned int, w_length, sizeof(r));
 677                         memcpy(req->buf, &r, value);
 678                 } else {
 679                         dev_err(&audio->gadget->dev,
 680                                 "%s:%d control_selector=%d TODO!\n",
 681                                 __func__, __LINE__, control_selector);
 682                 }
 683         } else {
 684                 dev_err(&audio->gadget->dev,
 685                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 686                         __func__, __LINE__, entity_id, control_selector);
 687         }
 688
 689         return value;
 690 }
 691
 692 static void
 693 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
 694 {
 695         struct g_audio *audio = req->context;
 696         struct usb_composite_dev *cdev = audio->func.config->cdev;
 697         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 698         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 699         struct usb_ctrlrequest *cr = &uac1->setup_cr;
 700         u16 w_index = le16_to_cpu(cr->wIndex);
 701         u16 w_value = le16_to_cpu(cr->wValue);
 702         u8 entity_id = (w_index >> 8) & 0xff;
 703         u8 control_selector = w_value >> 8;
 704
 705         if (req->status != 0) {
 706                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
 707                 return;
 708         }
 709
 710         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 711                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 712                 unsigned int is_playback = 0;
 713
 714                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
 715                         is_playback = 1;
 716
 717                 if (control_selector == UAC_FU_MUTE) {
 718                         u8 mute = *(u8 *)req->buf;
 719
 720                         u_audio_set_mute(audio, is_playback, mute);
 721
 722                         return;
 723                 } else if (control_selector == UAC_FU_VOLUME) {
 724                         __le16 *c = req->buf;
 725                         s16 volume;
 726
 727                         volume = le16_to_cpu(*c);
 728                         u_audio_set_volume(audio, is_playback, volume);
 729
 730                         return;
 731                 } else {
 732                         dev_err(&audio->gadget->dev,
 733                                 "%s:%d control_selector=%d TODO!\n",
 734                                 __func__, __LINE__, control_selector);
 735                         usb_ep_set_halt(ep);
 736                 }
 737         } else {
 738                 dev_err(&audio->gadget->dev,
 739                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 740                         __func__, __LINE__, entity_id, control_selector);
 741                 usb_ep_set_halt(ep);
 742
 743         }
 744 }
 745
 746 static int
 747 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
 748 {
 749         struct usb_request *req = fn->config->cdev->req;
 750         struct g_audio *audio = func_to_g_audio(fn);
 751         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
 752         struct f_uac1 *uac1 = func_to_uac1(&audio->func);
 753         u16 w_length = le16_to_cpu(cr->wLength);
 754         u16 w_index = le16_to_cpu(cr->wIndex);
 755         u16 w_value = le16_to_cpu(cr->wValue);
 756         u8 entity_id = (w_index >> 8) & 0xff;
 757         u8 control_selector = w_value >> 8;
 758
 759         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
 760                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
 761                 memcpy(&uac1->setup_cr, cr, sizeof(*cr));
 762                 req->context = audio;
 763                 req->complete = out_rq_cur_complete;
 764
 765                 return w_length;
 766         } else {
 767                 dev_err(&audio->gadget->dev,
 768                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
 769                         __func__, __LINE__, entity_id, control_selector);
 770         }
 771         return -EOPNOTSUPP;
 772 }
 773
 774 static int ac_rq_in(struct usb_function *f,
 775                 const struct usb_ctrlrequest *ctrl)
 776 {
 777         struct usb_composite_dev *cdev = f->config->cdev;
 778         int value = -EOPNOTSUPP;
 779         u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 780         u16 len = le16_to_cpu(ctrl->wLength);
 781         u16 w_value = le16_to_cpu(ctrl->wValue);
 782
 783         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 784                         ctrl->bRequest, w_value, len, ep);
 785
 786         switch (ctrl->bRequest) {
 787         case UAC_GET_CUR:
 788                 return in_rq_cur(f, ctrl);
 789         case UAC_GET_MIN:
 790                 return in_rq_min(f, ctrl);
 791         case UAC_GET_MAX:
 792                 return in_rq_max(f, ctrl);
 793         case UAC_GET_RES:
 794                 return in_rq_res(f, ctrl);
 795         case UAC_GET_MEM:
 796                 break;
 797         case UAC_GET_STAT:
 798                 value = len;
 799                 break;
 800         default:
 801                 break;
 802         }
 803
 804         return value;
 805 }
 806
 807 static int audio_set_endpoint_req(struct usb_function *f,
 808                 const struct usb_ctrlrequest *ctrl)
 809 {
 810         struct usb_composite_dev *cdev = f->config->cdev;
 811         struct usb_request      *req = f->config->cdev->req;
 812         struct f_uac1           *uac1 = func_to_uac1(f);
 813         int                     value = -EOPNOTSUPP;
 814         u16                     ep = le16_to_cpu(ctrl->wIndex);
 815         u16                     len = le16_to_cpu(ctrl->wLength);
 816         u16                     w_value = le16_to_cpu(ctrl->wValue);
 817         u8                      cs = w_value >> 8;
 818
 819         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 820                         ctrl->bRequest, w_value, len, ep);
 821
 822         switch (ctrl->bRequest) {
 823         case UAC_SET_CUR: {
 824                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 825                         cdev->gadget->ep0->driver_data = f;
 826                         uac1->ctl_id = ep;
 827                         req->complete = uac_cs_attr_sample_rate;
 828                 }
 829                 value = len;
 830                 break;
 831         }
 832
 833         case UAC_SET_MIN:
 834                 break;
 835
 836         case UAC_SET_MAX:
 837                 break;
 838
 839         case UAC_SET_RES:
 840                 break;
 841
 842         case UAC_SET_MEM:
 843                 break;
 844
 845         default:
 846                 break;
 847         }
 848
 849         return value;
 850 }
 851
 852 static int audio_get_endpoint_req(struct usb_function *f,
 853                 const struct usb_ctrlrequest *ctrl)
 854 {
 855         struct usb_composite_dev *cdev = f->config->cdev;
 856         struct usb_request *req = f->config->cdev->req;
 857         struct f_uac1 *uac1 = func_to_uac1(f);
 858         u8 *buf = (u8 *)req->buf;
 859         int value = -EOPNOTSUPP;
 860         u8 ep = le16_to_cpu(ctrl->wIndex);
 861         u16 len = le16_to_cpu(ctrl->wLength);
 862         u16 w_value = le16_to_cpu(ctrl->wValue);
 863         u8 cs = w_value >> 8;
 864         u32 val = 0;
 865
 866         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 867                         ctrl->bRequest, w_value, len, ep);
 868
 869         switch (ctrl->bRequest) {
 870         case UAC_GET_CUR: {
 871                 if (cs == UAC_EP_CS_ATTR_SAMPLE_RATE) {
 872                         if (ep == (USB_DIR_IN | 2))
 873                                 val = uac1->p_srate;
 874                         else if (ep == (USB_DIR_OUT | 1))
 875                                 val = uac1->c_srate;
 876                         buf[2] = (val >> 16) & 0xff;
 877                         buf[1] = (val >> 8) & 0xff;
 878                         buf[0] = val & 0xff;
 879                 }
 880                 value = len;
 881                 break;
 882         }
 883         case UAC_GET_MIN:
 884         case UAC_GET_MAX:
 885         case UAC_GET_RES:
 886                 value = len;
 887                 break;
 888         case UAC_GET_MEM:
 889                 break;
 890         default:
 891                 break;
 892         }
 893
 894         return value;
 895 }
 896
 897 static int
 898 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 899 {
 900         struct usb_composite_dev *cdev = f->config->cdev;
 901         struct usb_request      *req = cdev->req;
 902         int                     value = -EOPNOTSUPP;
 903         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 904         u16                     w_value = le16_to_cpu(ctrl->wValue);
 905         u16                     w_length = le16_to_cpu(ctrl->wLength);
 906
 907         /* composite driver infrastructure handles everything; interface
 908          * activation uses set_alt().
 909          */
 910         switch (ctrl->bRequestType) {
 911         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 912                 value = audio_set_endpoint_req(f, ctrl);
 913                 break;
 914
 915         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 916                 value = audio_get_endpoint_req(f, ctrl);
 917                 break;
 918         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 919                 if (ctrl->bRequest == UAC_SET_CUR)
 920                         value = out_rq_cur(f, ctrl);
 921                 break;
 922         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 923                 value = ac_rq_in(f, ctrl);
 924                 break;
 925         default:
 926                 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
 927                         ctrl->bRequestType, ctrl->bRequest,
 928                         w_value, w_index, w_length);
 929         }
 930
 931         /* respond with data transfer or status phase? */
 932         if (value >= 0) {
 933                 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
 934                         ctrl->bRequestType, ctrl->bRequest,
 935                         w_value, w_index, w_length);
 936                 req->zero = 0;
 937                 req->length = value;
 938                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
 939                 if (value < 0)
 940                         ERROR(cdev, "audio response on err %d\n", value);
 941         }
 942
 943         /* device either stalls (value < 0) or reports success */
 944         return value;
 945 }
 946
 947 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 948 {
 949         struct usb_composite_dev *cdev = f->config->cdev;
 950         struct usb_gadget *gadget = cdev->gadget;
 951         struct device *dev = &gadget->dev;
 952         struct g_audio *audio = func_to_g_audio(f);
 953         struct f_uac1 *uac1 = func_to_uac1(f);
 954         int ret = 0;
 955
 956         /* No i/f has more than 2 alt settings */
 957         if (alt > 1) {
 958                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 959                 return -EINVAL;
 960         }
 961
 962         if (intf == uac1->ac_intf) {
 963                 /* Control I/f has only 1 AltSetting - 0 */
 964                 if (alt) {
 965                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 966                         return -EINVAL;
 967                 }
 968
 969                 /* restart interrupt endpoint */
 970                 if (uac1->int_ep) {
 971                         usb_ep_disable(uac1->int_ep);
 972                         config_ep_by_speed(gadget, &audio->func, uac1->int_ep);
 973                         usb_ep_enable(uac1->int_ep);
 974                 }
 975
 976                 return 0;
 977         }
 978
 979         if (intf == uac1->as_out_intf) {
 980                 uac1->as_out_alt = alt;
 981
 982                 if (alt)
 983                         ret = u_audio_start_capture(&uac1->g_audio);
 984                 else
 985                         u_audio_stop_capture(&uac1->g_audio);
 986         } else if (intf == uac1->as_in_intf) {
 987                 uac1->as_in_alt = alt;
 988
 989                 if (alt)
 990                         ret = u_audio_start_playback(&uac1->g_audio);
 991                 else
 992                         u_audio_stop_playback(&uac1->g_audio);
 993         } else {
 994                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 995                 return -EINVAL;
 996         }
 997
 998         return ret;
 999 }
1000
1001 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
1002 {
1003         struct usb_composite_dev *cdev = f->config->cdev;
1004         struct usb_gadget *gadget = cdev->gadget;
1005         struct device *dev = &gadget->dev;
1006         struct f_uac1 *uac1 = func_to_uac1(f);
1007
1008         if (intf == uac1->ac_intf)
1009                 return uac1->ac_alt;
1010         else if (intf == uac1->as_out_intf)
1011                 return uac1->as_out_alt;
1012         else if (intf == uac1->as_in_intf)
1013                 return uac1->as_in_alt;
1014         else
1015                 dev_err(dev, "%s:%d Invalid Interface %d!\n",
1016                         __func__, __LINE__, intf);
1017
1018         return -EINVAL;
1019 }
1020
1021
1022 static void f_audio_disable(struct usb_function *f)
1023 {
1024         struct f_uac1 *uac1 = func_to_uac1(f);
1025
1026         uac1->as_out_alt = 0;
1027         uac1->as_in_alt = 0;
1028
1029         u_audio_stop_playback(&uac1->g_audio);
1030         u_audio_stop_capture(&uac1->g_audio);
1031         if (uac1->int_ep)
1032                 usb_ep_disable(uac1->int_ep);
1033 }
1034
1035 static void
1036 f_audio_suspend(struct usb_function *f)
1037 {
1038         struct f_uac1 *uac1 = func_to_uac1(f);
1039
1040         u_audio_suspend(&uac1->g_audio);
1041 }
1042
1043 /*-------------------------------------------------------------------------*/
1044 static struct uac_feature_unit_descriptor *build_fu_desc(int chmask)
1045 {
1046         struct uac_feature_unit_descriptor *fu_desc;
1047         int channels = num_channels(chmask);
1048         int fu_desc_size = UAC_DT_FEATURE_UNIT_SIZE(channels);
1049
1050         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
1051         if (!fu_desc)
1052                 return NULL;
1053
1054         fu_desc->bLength = fu_desc_size;
1055         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1056
1057         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
1058         fu_desc->bControlSize  = 2;
1059
1060         /* bUnitID, bSourceID and bmaControls will be defined later */
1061
1062         return fu_desc;
1063 }
1064
1065 /* B.3.2  Class-Specific AC Interface Descriptor */
1066 static struct
1067 uac1_ac_header_descriptor *build_ac_header_desc(struct f_uac1_opts *opts)
1068 {
1069         struct uac1_ac_header_descriptor *ac_desc;
1070         int ac_header_desc_size;
1071         int num_ifaces = 0;
1072
1073         if (EPOUT_EN(opts))
1074                 num_ifaces++;
1075         if (EPIN_EN(opts))
1076                 num_ifaces++;
1077
1078         ac_header_desc_size = UAC_DT_AC_HEADER_SIZE(num_ifaces);
1079
1080         ac_desc = kzalloc(ac_header_desc_size, GFP_KERNEL);
1081         if (!ac_desc)
1082                 return NULL;
1083
1084         ac_desc->bLength = ac_header_desc_size;
1085         ac_desc->bDescriptorType = USB_DT_CS_INTERFACE;
1086         ac_desc->bDescriptorSubtype = UAC_HEADER;
1087         ac_desc->bcdADC = cpu_to_le16(0x0100);
1088         ac_desc->bInCollection = num_ifaces;
1089
1090         /* wTotalLength and baInterfaceNr will be defined later */
1091
1092         return ac_desc;
1093 }
1094
1095 /* Use macro to overcome line length limitation */
1096 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
1097
1098 static void setup_descriptor(struct f_uac1_opts *opts)
1099 {
1100         /* patch descriptors */
1101         int i = 1; /* ID's start with 1 */
1102
1103         if (EPOUT_EN(opts))
1104                 usb_out_it_desc.bTerminalID = i++;
1105         if (EPIN_EN(opts))
1106                 io_in_it_desc.bTerminalID = i++;
1107         if (EPOUT_EN(opts))
1108                 io_out_ot_desc.bTerminalID = i++;
1109         if (EPIN_EN(opts))
1110                 usb_in_ot_desc.bTerminalID = i++;
1111         if (FUOUT_EN(opts))
1112                 out_feature_unit_desc->bUnitID = i++;
1113         if (FUIN_EN(opts))
1114                 in_feature_unit_desc->bUnitID = i++;
1115
1116         if (FUIN_EN(opts)) {
1117                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
1118                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
1119         } else {
1120                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
1121         }
1122         if (FUOUT_EN(opts)) {
1123                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
1124                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
1125         } else {
1126                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
1127         }
1128
1129         as_out_header_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
1130         as_in_header_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
1131
1132         ac_header_desc->wTotalLength = cpu_to_le16(ac_header_desc->bLength);
1133
1134         if (EPIN_EN(opts)) {
1135                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1136
1137                 len += sizeof(usb_in_ot_desc);
1138                 len += sizeof(io_in_it_desc);
1139                 if (FUIN_EN(opts))
1140                         len += in_feature_unit_desc->bLength;
1141                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1142         }
1143         if (EPOUT_EN(opts)) {
1144                 u16 len = le16_to_cpu(ac_header_desc->wTotalLength);
1145
1146                 len += sizeof(usb_out_it_desc);
1147                 len += sizeof(io_out_ot_desc);
1148                 if (FUOUT_EN(opts))
1149                         len += out_feature_unit_desc->bLength;
1150                 ac_header_desc->wTotalLength = cpu_to_le16(len);
1151         }
1152
1153         i = 0;
1154         f_audio_desc[i++] = USBDHDR(&ac_interface_desc);
1155         f_audio_desc[i++] = USBDHDR(ac_header_desc);
1156
1157         if (EPOUT_EN(opts)) {
1158                 f_audio_desc[i++] = USBDHDR(&usb_out_it_desc);
1159                 f_audio_desc[i++] = USBDHDR(&io_out_ot_desc);
1160                 if (FUOUT_EN(opts))
1161                         f_audio_desc[i++] = USBDHDR(out_feature_unit_desc);
1162         }
1163
1164         if (EPIN_EN(opts)) {
1165                 f_audio_desc[i++] = USBDHDR(&io_in_it_desc);
1166                 f_audio_desc[i++] = USBDHDR(&usb_in_ot_desc);
1167                 if (FUIN_EN(opts))
1168                         f_audio_desc[i++] = USBDHDR(in_feature_unit_desc);
1169         }
1170
1171         if (FUOUT_EN(opts) || FUIN_EN(opts))
1172                 f_audio_desc[i++] = USBDHDR(&ac_int_ep_desc);
1173
1174         if (EPOUT_EN(opts)) {
1175                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_0_desc);
1176                 f_audio_desc[i++] = USBDHDR(&as_out_interface_alt_1_desc);
1177                 f_audio_desc[i++] = USBDHDR(&as_out_header_desc);
1178                 f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc);
1179                 f_audio_desc[i++] = USBDHDR(&as_out_ep_desc);
1180                 f_audio_desc[i++] = USBDHDR(&as_iso_out_desc);
1181         }
1182         if (EPIN_EN(opts)) {
1183                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc);
1184                 f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_1_desc);
1185                 f_audio_desc[i++] = USBDHDR(&as_in_header_desc);
1186                 f_audio_desc[i++] = USBDHDR(&as_in_type_i_desc);
1187                 f_audio_desc[i++] = USBDHDR(&as_in_ep_desc);
1188                 f_audio_desc[i++] = USBDHDR(&as_iso_in_desc);
1189         }
1190         f_audio_desc[i] = NULL;
1191 }
1192
1193 static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
1194 {
1195         struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
1196
1197         if (!opts->p_chmask && !opts->c_chmask) {
1198                 dev_err(dev, "Error: no playback and capture channels\n");
1199                 return -EINVAL;
1200         } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
1201                 dev_err(dev, "Error: unsupported playback channels mask\n");
1202                 return -EINVAL;
1203         } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
1204                 dev_err(dev, "Error: unsupported capture channels mask\n");
1205                 return -EINVAL;
1206         } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
1207                 dev_err(dev, "Error: incorrect playback sample size\n");
1208                 return -EINVAL;
1209         } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
1210                 dev_err(dev, "Error: incorrect capture sample size\n");
1211                 return -EINVAL;
1212         } else if (!opts->p_srates[0]) {
1213                 dev_err(dev, "Error: incorrect playback sampling rate\n");
1214                 return -EINVAL;
1215         } else if (!opts->c_srates[0]) {
1216                 dev_err(dev, "Error: incorrect capture sampling rate\n");
1217                 return -EINVAL;
1218         }
1219
1220         if (opts->p_volume_max <= opts->p_volume_min) {
1221                 dev_err(dev, "Error: incorrect playback volume max/min\n");
1222                 return -EINVAL;
1223         } else if (opts->c_volume_max <= opts->c_volume_min) {
1224                 dev_err(dev, "Error: incorrect capture volume max/min\n");
1225                 return -EINVAL;
1226         } else if (opts->p_volume_res <= 0) {
1227                 dev_err(dev, "Error: negative/zero playback volume resolution\n");
1228                 return -EINVAL;
1229         } else if (opts->c_volume_res <= 0) {
1230                 dev_err(dev, "Error: negative/zero capture volume resolution\n");
1231                 return -EINVAL;
1232         }
1233
1234         if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
1235                 dev_err(dev, "Error: incorrect playback volume resolution\n");
1236                 return -EINVAL;
1237         } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
1238                 dev_err(dev, "Error: incorrect capture volume resolution\n");
1239                 return -EINVAL;
1240         }
1241
1242         return 0;
1243 }
1244
1245 /* audio function driver setup/binding */
1246 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
1247 {
1248         struct usb_composite_dev        *cdev = c->cdev;
1249         struct usb_gadget               *gadget = cdev->gadget;
1250         struct device                   *dev = &gadget->dev;
1251         struct f_uac1                   *uac1 = func_to_uac1(f);
1252         struct g_audio                  *audio = func_to_g_audio(f);
1253         struct f_uac1_opts              *audio_opts;
1254         struct usb_ep                   *ep = NULL;
1255         struct usb_string               *us;
1256         int                             ba_iface_id;
1257         int                             status;
1258         int                             idx, i;
1259
1260         status = f_audio_validate_opts(audio, dev);
1261         if (status)
1262                 return status;
1263
1264         audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1265
1266         strings_uac1[STR_AC_IF].s = audio_opts->function_name;
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 UAC1_ATTRIBUTE_STRING(function_name);
1685
1686 static struct configfs_attribute *f_uac1_attrs[] = {
1687         &f_uac1_opts_attr_c_chmask,
1688         &f_uac1_opts_attr_c_srate,
1689         &f_uac1_opts_attr_c_ssize,
1690         &f_uac1_opts_attr_p_chmask,
1691         &f_uac1_opts_attr_p_srate,
1692         &f_uac1_opts_attr_p_ssize,
1693         &f_uac1_opts_attr_req_number,
1694
1695         &f_uac1_opts_attr_p_mute_present,
1696         &f_uac1_opts_attr_p_volume_present,
1697         &f_uac1_opts_attr_p_volume_min,
1698         &f_uac1_opts_attr_p_volume_max,
1699         &f_uac1_opts_attr_p_volume_res,
1700
1701         &f_uac1_opts_attr_c_mute_present,
1702         &f_uac1_opts_attr_c_volume_present,
1703         &f_uac1_opts_attr_c_volume_min,
1704         &f_uac1_opts_attr_c_volume_max,
1705         &f_uac1_opts_attr_c_volume_res,
1706
1707         &f_uac1_opts_attr_function_name,
1708
1709         NULL,
1710 };
1711
1712 static const struct config_item_type f_uac1_func_type = {
1713         .ct_item_ops    = &f_uac1_item_ops,
1714         .ct_attrs       = f_uac1_attrs,
1715         .ct_owner       = THIS_MODULE,
1716 };
1717
1718 static void f_audio_free_inst(struct usb_function_instance *f)
1719 {
1720         struct f_uac1_opts *opts;
1721
1722         opts = container_of(f, struct f_uac1_opts, func_inst);
1723         kfree(opts);
1724 }
1725
1726 static struct usb_function_instance *f_audio_alloc_inst(void)
1727 {
1728         struct f_uac1_opts *opts;
1729
1730         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1731         if (!opts)
1732                 return ERR_PTR(-ENOMEM);
1733
1734         mutex_init(&opts->lock);
1735         opts->func_inst.free_func_inst = f_audio_free_inst;
1736
1737         config_group_init_type_name(&opts->func_inst.group, "",
1738                                     &f_uac1_func_type);
1739
1740         opts->c_chmask = UAC1_DEF_CCHMASK;
1741         opts->c_srates[0] = UAC1_DEF_CSRATE;
1742         opts->c_ssize = UAC1_DEF_CSSIZE;
1743         opts->p_chmask = UAC1_DEF_PCHMASK;
1744         opts->p_srates[0] = UAC1_DEF_PSRATE;
1745         opts->p_ssize = UAC1_DEF_PSSIZE;
1746
1747         opts->p_mute_present = UAC1_DEF_MUTE_PRESENT;
1748         opts->p_volume_present = UAC1_DEF_VOLUME_PRESENT;
1749         opts->p_volume_min = UAC1_DEF_MIN_DB;
1750         opts->p_volume_max = UAC1_DEF_MAX_DB;
1751         opts->p_volume_res = UAC1_DEF_RES_DB;
1752
1753         opts->c_mute_present = UAC1_DEF_MUTE_PRESENT;
1754         opts->c_volume_present = UAC1_DEF_VOLUME_PRESENT;
1755         opts->c_volume_min = UAC1_DEF_MIN_DB;
1756         opts->c_volume_max = UAC1_DEF_MAX_DB;
1757         opts->c_volume_res = UAC1_DEF_RES_DB;
1758
1759         opts->req_number = UAC1_DEF_REQ_NUM;
1760
1761         scnprintf(opts->function_name, sizeof(opts->function_name), "AC Interface");
1762
1763         return &opts->func_inst;
1764 }
1765
1766 static void f_audio_free(struct usb_function *f)
1767 {
1768         struct g_audio *audio;
1769         struct f_uac1_opts *opts;
1770
1771         audio = func_to_g_audio(f);
1772         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
1773         kfree(audio);
1774         mutex_lock(&opts->lock);
1775         --opts->refcnt;
1776         mutex_unlock(&opts->lock);
1777 }
1778
1779 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1780 {
1781         struct g_audio *audio = func_to_g_audio(f);
1782
1783         g_audio_cleanup(audio);
1784         usb_free_all_descriptors(f);
1785
1786         kfree(out_feature_unit_desc);
1787         out_feature_unit_desc = NULL;
1788         kfree(in_feature_unit_desc);
1789         in_feature_unit_desc = NULL;
1790
1791         kfree(ac_header_desc);
1792         ac_header_desc = NULL;
1793
1794         audio->gadget = NULL;
1795 }
1796
1797 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1798 {
1799         struct f_uac1 *uac1;
1800         struct f_uac1_opts *opts;
1801
1802         /* allocate and initialize one new instance */
1803         uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
1804         if (!uac1)
1805                 return ERR_PTR(-ENOMEM);
1806
1807         opts = container_of(fi, struct f_uac1_opts, func_inst);
1808         mutex_lock(&opts->lock);
1809         ++opts->refcnt;
1810         mutex_unlock(&opts->lock);
1811
1812         uac1->g_audio.func.name = "uac1_func";
1813         uac1->g_audio.func.bind = f_audio_bind;
1814         uac1->g_audio.func.unbind = f_audio_unbind;
1815         uac1->g_audio.func.set_alt = f_audio_set_alt;
1816         uac1->g_audio.func.get_alt = f_audio_get_alt;
1817         uac1->g_audio.func.setup = f_audio_setup;
1818         uac1->g_audio.func.disable = f_audio_disable;
1819         uac1->g_audio.func.suspend = f_audio_suspend;
1820         uac1->g_audio.func.free_func = f_audio_free;
1821
1822         return &uac1->g_audio.func;
1823 }
1824
1825 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
1826 MODULE_LICENSE("GPL");
1827 MODULE_AUTHOR("Ruslan Bilovol");