drivers/usb/gadget/function/f_uac2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * f_uac2.c -- USB Audio Class 2.0 Function
   4  *
   5  * Copyright (C) 2011
   6  *    Yadwinder Singh (yadi.brar01@gmail.com)
   7  *    Jaswinder Singh (jaswinder.singh@linaro.org)
   8  *
   9  * Copyright (C) 2020
  10  *    Ruslan Bilovol (ruslan.bilovol@gmail.com)
  11  */
  12
  13 #include <linux/usb/audio.h>
  14 #include <linux/usb/audio-v2.h>
  15 #include <linux/module.h>
  16
  17 #include "u_audio.h"
  18 #include "u_uac2.h"
  19
  20 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
  21 #define UAC2_CHANNEL_MASK 0x07FFFFFF
  22
  23 /*
  24  * The driver implements a simple UAC_2 topology.
  25  * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
  26  * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
  27  * Capture and Playback sampling rates are independently
  28  *  controlled by two clock sources :
  29  *    CLK_5 := c_srate, and CLK_6 := p_srate
  30  */
  31 #define USB_OUT_CLK_ID  (out_clk_src_desc.bClockID)
  32 #define USB_IN_CLK_ID   (in_clk_src_desc.bClockID)
  33 #define USB_OUT_FU_ID   (out_feature_unit_desc->bUnitID)
  34 #define USB_IN_FU_ID    (in_feature_unit_desc->bUnitID)
  35
  36 #define CONTROL_ABSENT  0
  37 #define CONTROL_RDONLY  1
  38 #define CONTROL_RDWR    3
  39
  40 #define CLK_FREQ_CTRL   0
  41 #define CLK_VLD_CTRL    2
  42 #define FU_MUTE_CTRL    0
  43 #define FU_VOL_CTRL     2
  44
  45 #define COPY_CTRL       0
  46 #define CONN_CTRL       2
  47 #define OVRLD_CTRL      4
  48 #define CLSTR_CTRL      6
  49 #define UNFLW_CTRL      8
  50 #define OVFLW_CTRL      10
  51
  52 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
  53 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
  54 #define FUIN_EN(_opts) (EPIN_EN(_opts) \
  55                                 && ((_opts)->p_mute_present \
  56                                 || (_opts)->p_volume_present))
  57 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
  58                                 && ((_opts)->c_mute_present \
  59                                 || (_opts)->c_volume_present))
  60 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
  61
  62 struct f_uac2 {
  63         struct g_audio g_audio;
  64         u8 ac_intf, as_in_intf, as_out_intf;
  65         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  66
  67         struct usb_ctrlrequest setup_cr;        /* will be used in data stage */
  68
  69         /* Interrupt IN endpoint of AC interface */
  70         struct usb_ep   *int_ep;
  71         atomic_t        int_count;
  72 };
  73
  74 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
  75 {
  76         return container_of(f, struct f_uac2, g_audio.func);
  77 }
  78
  79 static inline
  80 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
  81 {
  82         return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
  83 }
  84
  85 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
  86
  87 /* --------- USB Function Interface ------------- */
  88
  89 enum {
  90         STR_ASSOC,
  91         STR_IF_CTRL,
  92         STR_CLKSRC_IN,
  93         STR_CLKSRC_OUT,
  94         STR_USB_IT,
  95         STR_IO_IT,
  96         STR_USB_OT,
  97         STR_IO_OT,
  98         STR_FU_IN,
  99         STR_FU_OUT,
 100         STR_AS_OUT_ALT0,
 101         STR_AS_OUT_ALT1,
 102         STR_AS_IN_ALT0,
 103         STR_AS_IN_ALT1,
 104 };
 105
 106 static char clksrc_in[8];
 107 static char clksrc_out[8];
 108
 109 static struct usb_string strings_fn[] = {
 110         [STR_ASSOC].s = "Source/Sink",
 111         [STR_IF_CTRL].s = "Topology Control",
 112         [STR_CLKSRC_IN].s = clksrc_in,
 113         [STR_CLKSRC_OUT].s = clksrc_out,
 114         [STR_USB_IT].s = "USBH Out",
 115         [STR_IO_IT].s = "USBD Out",
 116         [STR_USB_OT].s = "USBH In",
 117         [STR_IO_OT].s = "USBD In",
 118         [STR_FU_IN].s = "Capture Volume",
 119         [STR_FU_OUT].s = "Playback Volume",
 120         [STR_AS_OUT_ALT0].s = "Playback Inactive",
 121         [STR_AS_OUT_ALT1].s = "Playback Active",
 122         [STR_AS_IN_ALT0].s = "Capture Inactive",
 123         [STR_AS_IN_ALT1].s = "Capture Active",
 124         { },
 125 };
 126
 127 static struct usb_gadget_strings str_fn = {
 128         .language = 0x0409,     /* en-us */
 129         .strings = strings_fn,
 130 };
 131
 132 static struct usb_gadget_strings *fn_strings[] = {
 133         &str_fn,
 134         NULL,
 135 };
 136
 137 static struct usb_interface_assoc_descriptor iad_desc = {
 138         .bLength = sizeof iad_desc,
 139         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 140
 141         .bFirstInterface = 0,
 142         .bInterfaceCount = 3,
 143         .bFunctionClass = USB_CLASS_AUDIO,
 144         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 145         .bFunctionProtocol = UAC_VERSION_2,
 146 };
 147
 148 /* Audio Control Interface */
 149 static struct usb_interface_descriptor std_ac_if_desc = {
 150         .bLength = sizeof std_ac_if_desc,
 151         .bDescriptorType = USB_DT_INTERFACE,
 152
 153         .bAlternateSetting = 0,
 154         /* .bNumEndpoints = DYNAMIC */
 155         .bInterfaceClass = USB_CLASS_AUDIO,
 156         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 157         .bInterfaceProtocol = UAC_VERSION_2,
 158 };
 159
 160 /* Clock source for IN traffic */
 161 static struct uac_clock_source_descriptor in_clk_src_desc = {
 162         .bLength = sizeof in_clk_src_desc,
 163         .bDescriptorType = USB_DT_CS_INTERFACE,
 164
 165         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 166         /* .bClockID = DYNAMIC */
 167         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 168         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 169         .bAssocTerminal = 0,
 170 };
 171
 172 /* Clock source for OUT traffic */
 173 static struct uac_clock_source_descriptor out_clk_src_desc = {
 174         .bLength = sizeof out_clk_src_desc,
 175         .bDescriptorType = USB_DT_CS_INTERFACE,
 176
 177         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 178         /* .bClockID = DYNAMIC */
 179         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 180         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 181         .bAssocTerminal = 0,
 182 };
 183
 184 /* Input Terminal for USB_OUT */
 185 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
 186         .bLength = sizeof usb_out_it_desc,
 187         .bDescriptorType = USB_DT_CS_INTERFACE,
 188
 189         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 190         /* .bTerminalID = DYNAMIC */
 191         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 192         .bAssocTerminal = 0,
 193         /* .bCSourceID = DYNAMIC */
 194         .iChannelNames = 0,
 195         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 196 };
 197
 198 /* Input Terminal for I/O-In */
 199 static struct uac2_input_terminal_descriptor io_in_it_desc = {
 200         .bLength = sizeof io_in_it_desc,
 201         .bDescriptorType = USB_DT_CS_INTERFACE,
 202
 203         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 204         /* .bTerminalID = DYNAMIC */
 205         .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
 206         .bAssocTerminal = 0,
 207         /* .bCSourceID = DYNAMIC */
 208         .iChannelNames = 0,
 209         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 210 };
 211
 212 /* Ouput Terminal for USB_IN */
 213 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 214         .bLength = sizeof usb_in_ot_desc,
 215         .bDescriptorType = USB_DT_CS_INTERFACE,
 216
 217         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 218         /* .bTerminalID = DYNAMIC */
 219         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 220         .bAssocTerminal = 0,
 221         /* .bSourceID = DYNAMIC */
 222         /* .bCSourceID = DYNAMIC */
 223         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 224 };
 225
 226 /* Ouput Terminal for I/O-Out */
 227 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
 228         .bLength = sizeof io_out_ot_desc,
 229         .bDescriptorType = USB_DT_CS_INTERFACE,
 230
 231         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 232         /* .bTerminalID = DYNAMIC */
 233         .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
 234         .bAssocTerminal = 0,
 235         /* .bSourceID = DYNAMIC */
 236         /* .bCSourceID = DYNAMIC */
 237         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 238 };
 239
 240 static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
 241 static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
 242
 243 static struct uac2_ac_header_descriptor ac_hdr_desc = {
 244         .bLength = sizeof ac_hdr_desc,
 245         .bDescriptorType = USB_DT_CS_INTERFACE,
 246
 247         .bDescriptorSubtype = UAC_MS_HEADER,
 248         .bcdADC = cpu_to_le16(0x200),
 249         .bCategory = UAC2_FUNCTION_IO_BOX,
 250         /* .wTotalLength = DYNAMIC */
 251         .bmControls = 0,
 252 };
 253
 254 /* AC IN Interrupt Endpoint */
 255 static struct usb_endpoint_descriptor fs_ep_int_desc = {
 256         .bLength = USB_DT_ENDPOINT_SIZE,
 257         .bDescriptorType = USB_DT_ENDPOINT,
 258
 259         .bEndpointAddress = USB_DIR_IN,
 260         .bmAttributes = USB_ENDPOINT_XFER_INT,
 261         .wMaxPacketSize = cpu_to_le16(6),
 262         .bInterval = 1,
 263 };
 264
 265 static struct usb_endpoint_descriptor hs_ep_int_desc = {
 266         .bLength = USB_DT_ENDPOINT_SIZE,
 267         .bDescriptorType = USB_DT_ENDPOINT,
 268
 269         .bmAttributes = USB_ENDPOINT_XFER_INT,
 270         .wMaxPacketSize = cpu_to_le16(6),
 271         .bInterval = 4,
 272 };
 273
 274 static struct usb_endpoint_descriptor ss_ep_int_desc = {
 275         .bLength = USB_DT_ENDPOINT_SIZE,
 276         .bDescriptorType = USB_DT_ENDPOINT,
 277
 278         .bEndpointAddress = USB_DIR_IN,
 279         .bmAttributes = USB_ENDPOINT_XFER_INT,
 280         .wMaxPacketSize = cpu_to_le16(6),
 281         .bInterval = 4,
 282 };
 283
 284 /* Audio Streaming OUT Interface - Alt0 */
 285 static struct usb_interface_descriptor std_as_out_if0_desc = {
 286         .bLength = sizeof std_as_out_if0_desc,
 287         .bDescriptorType = USB_DT_INTERFACE,
 288
 289         .bAlternateSetting = 0,
 290         .bNumEndpoints = 0,
 291         .bInterfaceClass = USB_CLASS_AUDIO,
 292         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 293         .bInterfaceProtocol = UAC_VERSION_2,
 294 };
 295
 296 /* Audio Streaming OUT Interface - Alt1 */
 297 static struct usb_interface_descriptor std_as_out_if1_desc = {
 298         .bLength = sizeof std_as_out_if1_desc,
 299         .bDescriptorType = USB_DT_INTERFACE,
 300
 301         .bAlternateSetting = 1,
 302         .bNumEndpoints = 1,
 303         .bInterfaceClass = USB_CLASS_AUDIO,
 304         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 305         .bInterfaceProtocol = UAC_VERSION_2,
 306 };
 307
 308 /* Audio Stream OUT Intface Desc */
 309 static struct uac2_as_header_descriptor as_out_hdr_desc = {
 310         .bLength = sizeof as_out_hdr_desc,
 311         .bDescriptorType = USB_DT_CS_INTERFACE,
 312
 313         .bDescriptorSubtype = UAC_AS_GENERAL,
 314         /* .bTerminalLink = DYNAMIC */
 315         .bmControls = 0,
 316         .bFormatType = UAC_FORMAT_TYPE_I,
 317         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 318         .iChannelNames = 0,
 319 };
 320
 321 /* Audio USB_OUT Format */
 322 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 323         .bLength = sizeof as_out_fmt1_desc,
 324         .bDescriptorType = USB_DT_CS_INTERFACE,
 325         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 326         .bFormatType = UAC_FORMAT_TYPE_I,
 327 };
 328
 329 /* STD AS ISO OUT Endpoint */
 330 static struct usb_endpoint_descriptor fs_epout_desc = {
 331         .bLength = USB_DT_ENDPOINT_SIZE,
 332         .bDescriptorType = USB_DT_ENDPOINT,
 333
 334         .bEndpointAddress = USB_DIR_OUT,
 335         /* .bmAttributes = DYNAMIC */
 336         /* .wMaxPacketSize = DYNAMIC */
 337         .bInterval = 1,
 338 };
 339
 340 static struct usb_endpoint_descriptor hs_epout_desc = {
 341         .bLength = USB_DT_ENDPOINT_SIZE,
 342         .bDescriptorType = USB_DT_ENDPOINT,
 343
 344         /* .bmAttributes = DYNAMIC */
 345         /* .wMaxPacketSize = DYNAMIC */
 346         .bInterval = 4,
 347 };
 348
 349 static struct usb_endpoint_descriptor ss_epout_desc = {
 350         .bLength = USB_DT_ENDPOINT_SIZE,
 351         .bDescriptorType = USB_DT_ENDPOINT,
 352
 353         .bEndpointAddress = USB_DIR_OUT,
 354         /* .bmAttributes = DYNAMIC */
 355         /* .wMaxPacketSize = DYNAMIC */
 356         .bInterval = 4,
 357 };
 358
 359 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
 360         .bLength                = sizeof(ss_epout_desc_comp),
 361         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 362         .bMaxBurst              = 0,
 363         .bmAttributes           = 0,
 364         /* wBytesPerInterval = DYNAMIC */
 365 };
 366
 367 /* CS AS ISO OUT Endpoint */
 368 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 369         .bLength = sizeof as_iso_out_desc,
 370         .bDescriptorType = USB_DT_CS_ENDPOINT,
 371
 372         .bDescriptorSubtype = UAC_EP_GENERAL,
 373         .bmAttributes = 0,
 374         .bmControls = 0,
 375         .bLockDelayUnits = 0,
 376         .wLockDelay = 0,
 377 };
 378
 379 /* STD AS ISO IN Feedback Endpoint */
 380 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
 381         .bLength = USB_DT_ENDPOINT_SIZE,
 382         .bDescriptorType = USB_DT_ENDPOINT,
 383
 384         .bEndpointAddress = USB_DIR_IN,
 385         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 386         .wMaxPacketSize = cpu_to_le16(3),
 387         .bInterval = 1,
 388 };
 389
 390 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
 391         .bLength = USB_DT_ENDPOINT_SIZE,
 392         .bDescriptorType = USB_DT_ENDPOINT,
 393
 394         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 395         .wMaxPacketSize = cpu_to_le16(4),
 396         .bInterval = 4,
 397 };
 398
 399 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
 400         .bLength = USB_DT_ENDPOINT_SIZE,
 401         .bDescriptorType = USB_DT_ENDPOINT,
 402
 403         .bEndpointAddress = USB_DIR_IN,
 404         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 405         .wMaxPacketSize = cpu_to_le16(4),
 406         .bInterval = 4,
 407 };
 408
 409
 410 /* Audio Streaming IN Interface - Alt0 */
 411 static struct usb_interface_descriptor std_as_in_if0_desc = {
 412         .bLength = sizeof std_as_in_if0_desc,
 413         .bDescriptorType = USB_DT_INTERFACE,
 414
 415         .bAlternateSetting = 0,
 416         .bNumEndpoints = 0,
 417         .bInterfaceClass = USB_CLASS_AUDIO,
 418         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 419         .bInterfaceProtocol = UAC_VERSION_2,
 420 };
 421
 422 /* Audio Streaming IN Interface - Alt1 */
 423 static struct usb_interface_descriptor std_as_in_if1_desc = {
 424         .bLength = sizeof std_as_in_if1_desc,
 425         .bDescriptorType = USB_DT_INTERFACE,
 426
 427         .bAlternateSetting = 1,
 428         .bNumEndpoints = 1,
 429         .bInterfaceClass = USB_CLASS_AUDIO,
 430         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 431         .bInterfaceProtocol = UAC_VERSION_2,
 432 };
 433
 434 /* Audio Stream IN Intface Desc */
 435 static struct uac2_as_header_descriptor as_in_hdr_desc = {
 436         .bLength = sizeof as_in_hdr_desc,
 437         .bDescriptorType = USB_DT_CS_INTERFACE,
 438
 439         .bDescriptorSubtype = UAC_AS_GENERAL,
 440         /* .bTerminalLink = DYNAMIC */
 441         .bmControls = 0,
 442         .bFormatType = UAC_FORMAT_TYPE_I,
 443         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 444         .iChannelNames = 0,
 445 };
 446
 447 /* Audio USB_IN Format */
 448 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 449         .bLength = sizeof as_in_fmt1_desc,
 450         .bDescriptorType = USB_DT_CS_INTERFACE,
 451         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 452         .bFormatType = UAC_FORMAT_TYPE_I,
 453 };
 454
 455 /* STD AS ISO IN Endpoint */
 456 static struct usb_endpoint_descriptor fs_epin_desc = {
 457         .bLength = USB_DT_ENDPOINT_SIZE,
 458         .bDescriptorType = USB_DT_ENDPOINT,
 459
 460         .bEndpointAddress = USB_DIR_IN,
 461         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 462         /* .wMaxPacketSize = DYNAMIC */
 463         .bInterval = 1,
 464 };
 465
 466 static struct usb_endpoint_descriptor hs_epin_desc = {
 467         .bLength = USB_DT_ENDPOINT_SIZE,
 468         .bDescriptorType = USB_DT_ENDPOINT,
 469
 470         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 471         /* .wMaxPacketSize = DYNAMIC */
 472         .bInterval = 4,
 473 };
 474
 475 static struct usb_endpoint_descriptor ss_epin_desc = {
 476         .bLength = USB_DT_ENDPOINT_SIZE,
 477         .bDescriptorType = USB_DT_ENDPOINT,
 478
 479         .bEndpointAddress = USB_DIR_IN,
 480         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 481         /* .wMaxPacketSize = DYNAMIC */
 482         .bInterval = 4,
 483 };
 484
 485 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
 486         .bLength                = sizeof(ss_epin_desc_comp),
 487         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 488         .bMaxBurst              = 0,
 489         .bmAttributes           = 0,
 490         /* wBytesPerInterval = DYNAMIC */
 491 };
 492
 493 /* CS AS ISO IN Endpoint */
 494 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 495         .bLength = sizeof as_iso_in_desc,
 496         .bDescriptorType = USB_DT_CS_ENDPOINT,
 497
 498         .bDescriptorSubtype = UAC_EP_GENERAL,
 499         .bmAttributes = 0,
 500         .bmControls = 0,
 501         .bLockDelayUnits = 0,
 502         .wLockDelay = 0,
 503 };
 504
 505 static struct usb_descriptor_header *fs_audio_desc[] = {
 506         (struct usb_descriptor_header *)&iad_desc,
 507         (struct usb_descriptor_header *)&std_ac_if_desc,
 508
 509         (struct usb_descriptor_header *)&ac_hdr_desc,
 510         (struct usb_descriptor_header *)&in_clk_src_desc,
 511         (struct usb_descriptor_header *)&out_clk_src_desc,
 512         (struct usb_descriptor_header *)&usb_out_it_desc,
 513         (struct usb_descriptor_header *)&out_feature_unit_desc,
 514         (struct usb_descriptor_header *)&io_in_it_desc,
 515         (struct usb_descriptor_header *)&usb_in_ot_desc,
 516         (struct usb_descriptor_header *)&in_feature_unit_desc,
 517         (struct usb_descriptor_header *)&io_out_ot_desc,
 518
 519         (struct usb_descriptor_header *)&fs_ep_int_desc,
 520
 521         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 522         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 523
 524         (struct usb_descriptor_header *)&as_out_hdr_desc,
 525         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 526         (struct usb_descriptor_header *)&fs_epout_desc,
 527         (struct usb_descriptor_header *)&as_iso_out_desc,
 528         (struct usb_descriptor_header *)&fs_epin_fback_desc,
 529
 530         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 531         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 532
 533         (struct usb_descriptor_header *)&as_in_hdr_desc,
 534         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 535         (struct usb_descriptor_header *)&fs_epin_desc,
 536         (struct usb_descriptor_header *)&as_iso_in_desc,
 537         NULL,
 538 };
 539
 540 static struct usb_descriptor_header *hs_audio_desc[] = {
 541         (struct usb_descriptor_header *)&iad_desc,
 542         (struct usb_descriptor_header *)&std_ac_if_desc,
 543
 544         (struct usb_descriptor_header *)&ac_hdr_desc,
 545         (struct usb_descriptor_header *)&in_clk_src_desc,
 546         (struct usb_descriptor_header *)&out_clk_src_desc,
 547         (struct usb_descriptor_header *)&usb_out_it_desc,
 548         (struct usb_descriptor_header *)&out_feature_unit_desc,
 549         (struct usb_descriptor_header *)&io_in_it_desc,
 550         (struct usb_descriptor_header *)&usb_in_ot_desc,
 551         (struct usb_descriptor_header *)&in_feature_unit_desc,
 552         (struct usb_descriptor_header *)&io_out_ot_desc,
 553
 554         (struct usb_descriptor_header *)&hs_ep_int_desc,
 555
 556         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 557         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 558
 559         (struct usb_descriptor_header *)&as_out_hdr_desc,
 560         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 561         (struct usb_descriptor_header *)&hs_epout_desc,
 562         (struct usb_descriptor_header *)&as_iso_out_desc,
 563         (struct usb_descriptor_header *)&hs_epin_fback_desc,
 564
 565         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 566         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 567
 568         (struct usb_descriptor_header *)&as_in_hdr_desc,
 569         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 570         (struct usb_descriptor_header *)&hs_epin_desc,
 571         (struct usb_descriptor_header *)&as_iso_in_desc,
 572         NULL,
 573 };
 574
 575 static struct usb_descriptor_header *ss_audio_desc[] = {
 576         (struct usb_descriptor_header *)&iad_desc,
 577         (struct usb_descriptor_header *)&std_ac_if_desc,
 578
 579         (struct usb_descriptor_header *)&ac_hdr_desc,
 580         (struct usb_descriptor_header *)&in_clk_src_desc,
 581         (struct usb_descriptor_header *)&out_clk_src_desc,
 582         (struct usb_descriptor_header *)&usb_out_it_desc,
 583   (struct usb_descriptor_header *)&out_feature_unit_desc,
 584         (struct usb_descriptor_header *)&io_in_it_desc,
 585         (struct usb_descriptor_header *)&usb_in_ot_desc,
 586         (struct usb_descriptor_header *)&in_feature_unit_desc,
 587         (struct usb_descriptor_header *)&io_out_ot_desc,
 588
 589   (struct usb_descriptor_header *)&ss_ep_int_desc,
 590
 591         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 592         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 593
 594         (struct usb_descriptor_header *)&as_out_hdr_desc,
 595         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 596         (struct usb_descriptor_header *)&ss_epout_desc,
 597         (struct usb_descriptor_header *)&ss_epout_desc_comp,
 598         (struct usb_descriptor_header *)&as_iso_out_desc,
 599         (struct usb_descriptor_header *)&ss_epin_fback_desc,
 600
 601         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 602         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 603
 604         (struct usb_descriptor_header *)&as_in_hdr_desc,
 605         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 606         (struct usb_descriptor_header *)&ss_epin_desc,
 607         (struct usb_descriptor_header *)&ss_epin_desc_comp,
 608         (struct usb_descriptor_header *)&as_iso_in_desc,
 609         NULL,
 610 };
 611
 612 struct cntrl_cur_lay2 {
 613         __le16  wCUR;
 614 };
 615
 616 struct cntrl_range_lay2 {
 617         __le16  wNumSubRanges;
 618         __le16  wMIN;
 619         __le16  wMAX;
 620         __le16  wRES;
 621 } __packed;
 622
 623 struct cntrl_cur_lay3 {
 624         __le32  dCUR;
 625 };
 626
 627 struct cntrl_range_lay3 {
 628         __le16  wNumSubRanges;
 629         __le32  dMIN;
 630         __le32  dMAX;
 631         __le32  dRES;
 632 } __packed;
 633
 634 static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
 635         struct usb_endpoint_descriptor *ep_desc,
 636         enum usb_device_speed speed, bool is_playback)
 637 {
 638         int chmask, srate, ssize;
 639         u16 max_size_bw, max_size_ep;
 640         unsigned int factor;
 641
 642         switch (speed) {
 643         case USB_SPEED_FULL:
 644                 max_size_ep = 1023;
 645                 factor = 1000;
 646                 break;
 647
 648         case USB_SPEED_HIGH:
 649         case USB_SPEED_SUPER:
 650                 max_size_ep = 1024;
 651                 factor = 8000;
 652                 break;
 653
 654         default:
 655                 return -EINVAL;
 656         }
 657
 658         if (is_playback) {
 659                 chmask = uac2_opts->p_chmask;
 660                 srate = uac2_opts->p_srate;
 661                 ssize = uac2_opts->p_ssize;
 662         } else {
 663                 chmask = uac2_opts->c_chmask;
 664                 srate = uac2_opts->c_srate;
 665                 ssize = uac2_opts->c_ssize;
 666         }
 667
 668         if (!is_playback && (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC))
 669                 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
 670
 671         max_size_bw = num_channels(chmask) * ssize *
 672                 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
 673         ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
 674                                                     max_size_ep));
 675
 676         return 0;
 677 }
 678
 679 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
 680 {
 681         struct uac2_feature_unit_descriptor *fu_desc;
 682         int channels = num_channels(chmask);
 683         int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
 684
 685         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 686         if (!fu_desc)
 687                 return NULL;
 688
 689         fu_desc->bLength = fu_desc_size;
 690         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 691
 692         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 693
 694         /* bUnitID, bSourceID and bmaControls will be defined later */
 695
 696         return fu_desc;
 697 }
 698
 699 /* Use macro to overcome line length limitation */
 700 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
 701
 702 static void setup_headers(struct f_uac2_opts *opts,
 703                           struct usb_descriptor_header **headers,
 704                           enum usb_device_speed speed)
 705 {
 706         struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
 707         struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
 708         struct usb_endpoint_descriptor *epout_desc;
 709         struct usb_endpoint_descriptor *epin_desc;
 710         struct usb_endpoint_descriptor *epin_fback_desc;
 711         struct usb_endpoint_descriptor *ep_int_desc;
 712         int i;
 713
 714         switch (speed) {
 715         case USB_SPEED_FULL:
 716                 epout_desc = &fs_epout_desc;
 717                 epin_desc = &fs_epin_desc;
 718                 epin_fback_desc = &fs_epin_fback_desc;
 719                 ep_int_desc = &fs_ep_int_desc;
 720                 break;
 721         case USB_SPEED_HIGH:
 722                 epout_desc = &hs_epout_desc;
 723                 epin_desc = &hs_epin_desc;
 724                 epin_fback_desc = &hs_epin_fback_desc;
 725                 ep_int_desc = &hs_ep_int_desc;
 726                 break;
 727         default:
 728                 epout_desc = &ss_epout_desc;
 729                 epin_desc = &ss_epin_desc;
 730                 epout_desc_comp = &ss_epout_desc_comp;
 731                 epin_desc_comp = &ss_epin_desc_comp;
 732                 epin_fback_desc = &ss_epin_fback_desc;
 733                 ep_int_desc = &ss_ep_int_desc;
 734         }
 735
 736         i = 0;
 737         headers[i++] = USBDHDR(&iad_desc);
 738         headers[i++] = USBDHDR(&std_ac_if_desc);
 739         headers[i++] = USBDHDR(&ac_hdr_desc);
 740         if (EPIN_EN(opts))
 741                 headers[i++] = USBDHDR(&in_clk_src_desc);
 742         if (EPOUT_EN(opts)) {
 743                 headers[i++] = USBDHDR(&out_clk_src_desc);
 744                 headers[i++] = USBDHDR(&usb_out_it_desc);
 745
 746     if (FUOUT_EN(opts))
 747       headers[i++] = USBDHDR(out_feature_unit_desc);
 748   }
 749
 750         if (EPIN_EN(opts)) {
 751                 headers[i++] = USBDHDR(&io_in_it_desc);
 752
 753     if (FUIN_EN(opts))
 754       headers[i++] = USBDHDR(in_feature_unit_desc);
 755
 756                 headers[i++] = USBDHDR(&usb_in_ot_desc);
 757         }
 758
 759         if (EPOUT_EN(opts))
 760                 headers[i++] = USBDHDR(&io_out_ot_desc);
 761
 762   if (FUOUT_EN(opts) || FUIN_EN(opts))
 763       headers[i++] = USBDHDR(ep_int_desc);
 764
 765   if (EPOUT_EN(opts)) {
 766                 headers[i++] = USBDHDR(&std_as_out_if0_desc);
 767                 headers[i++] = USBDHDR(&std_as_out_if1_desc);
 768                 headers[i++] = USBDHDR(&as_out_hdr_desc);
 769                 headers[i++] = USBDHDR(&as_out_fmt1_desc);
 770                 headers[i++] = USBDHDR(epout_desc);
 771                 if (epout_desc_comp)
 772                         headers[i++] = USBDHDR(epout_desc_comp);
 773
 774                 headers[i++] = USBDHDR(&as_iso_out_desc);
 775
 776                 if (EPOUT_FBACK_IN_EN(opts))
 777                         headers[i++] = USBDHDR(epin_fback_desc);
 778         }
 779
 780         if (EPIN_EN(opts)) {
 781                 headers[i++] = USBDHDR(&std_as_in_if0_desc);
 782                 headers[i++] = USBDHDR(&std_as_in_if1_desc);
 783                 headers[i++] = USBDHDR(&as_in_hdr_desc);
 784                 headers[i++] = USBDHDR(&as_in_fmt1_desc);
 785                 headers[i++] = USBDHDR(epin_desc);
 786                 if (epin_desc_comp)
 787                         headers[i++] = USBDHDR(epin_desc_comp);
 788
 789                 headers[i++] = USBDHDR(&as_iso_in_desc);
 790         }
 791         headers[i] = NULL;
 792 }
 793
 794 static void setup_descriptor(struct f_uac2_opts *opts)
 795 {
 796         /* patch descriptors */
 797         int i = 1; /* ID's start with 1 */
 798
 799         if (EPOUT_EN(opts))
 800                 usb_out_it_desc.bTerminalID = i++;
 801         if (EPIN_EN(opts))
 802                 io_in_it_desc.bTerminalID = i++;
 803         if (EPOUT_EN(opts))
 804                 io_out_ot_desc.bTerminalID = i++;
 805         if (EPIN_EN(opts))
 806                 usb_in_ot_desc.bTerminalID = i++;
 807         if (FUOUT_EN(opts))
 808                 out_feature_unit_desc->bUnitID = i++;
 809         if (FUIN_EN(opts))
 810                 in_feature_unit_desc->bUnitID = i++;
 811         if (EPOUT_EN(opts))
 812                 out_clk_src_desc.bClockID = i++;
 813         if (EPIN_EN(opts))
 814                 in_clk_src_desc.bClockID = i++;
 815
 816         usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
 817
 818         if (FUIN_EN(opts)) {
 819                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
 820                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
 821         } else {
 822                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
 823         }
 824
 825         usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
 826         io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
 827         io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
 828
 829         if (FUOUT_EN(opts)) {
 830                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
 831                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
 832         } else {
 833                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
 834         }
 835
 836         as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
 837         as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 838
 839         iad_desc.bInterfaceCount = 1;
 840         ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 841
 842         if (EPIN_EN(opts)) {
 843                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 844
 845                 len += sizeof(in_clk_src_desc);
 846                 len += sizeof(usb_in_ot_desc);
 847
 848                 if (FUIN_EN(opts))
 849                         len += in_feature_unit_desc->bLength;
 850
 851                 len += sizeof(io_in_it_desc);
 852                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 853                 iad_desc.bInterfaceCount++;
 854         }
 855         if (EPOUT_EN(opts)) {
 856                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 857
 858                 len += sizeof(out_clk_src_desc);
 859                 len += sizeof(usb_out_it_desc);
 860
 861                 if (FUOUT_EN(opts))
 862                         len += out_feature_unit_desc->bLength;
 863
 864                 len += sizeof(io_out_ot_desc);
 865                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 866                 iad_desc.bInterfaceCount++;
 867         }
 868
 869         setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
 870         setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
 871         setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
 872 }
 873
 874 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
 875 {
 876         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
 877
 878         if (!opts->p_chmask && !opts->c_chmask) {
 879                 dev_err(dev, "Error: no playback and capture channels\n");
 880                 return -EINVAL;
 881         } else if (opts->p_chmask & ~UAC2_CHANNEL_MASK) {
 882                 dev_err(dev, "Error: unsupported playback channels mask\n");
 883                 return -EINVAL;
 884         } else if (opts->c_chmask & ~UAC2_CHANNEL_MASK) {
 885                 dev_err(dev, "Error: unsupported capture channels mask\n");
 886                 return -EINVAL;
 887         } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
 888                 dev_err(dev, "Error: incorrect playback sample size\n");
 889                 return -EINVAL;
 890         } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
 891                 dev_err(dev, "Error: incorrect capture sample size\n");
 892                 return -EINVAL;
 893         } else if (!opts->p_srate) {
 894                 dev_err(dev, "Error: incorrect playback sampling rate\n");
 895                 return -EINVAL;
 896         } else if (!opts->c_srate) {
 897                 dev_err(dev, "Error: incorrect capture sampling rate\n");
 898                 return -EINVAL;
 899         }
 900
 901         if (opts->p_volume_max <= opts->p_volume_min) {
 902                 dev_err(dev, "Error: incorrect playback volume max/min\n");
 903                         return -EINVAL;
 904         } else if (opts->c_volume_max <= opts->c_volume_min) {
 905                 dev_err(dev, "Error: incorrect capture volume max/min\n");
 906                         return -EINVAL;
 907         } else if (opts->p_volume_res <= 0) {
 908                 dev_err(dev, "Error: negative/zero playback volume resolution\n");
 909                         return -EINVAL;
 910         } else if (opts->c_volume_res <= 0) {
 911                 dev_err(dev, "Error: negative/zero capture volume resolution\n");
 912                         return -EINVAL;
 913         }
 914
 915         if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
 916                 dev_err(dev, "Error: incorrect playback volume resolution\n");
 917                         return -EINVAL;
 918         } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
 919                 dev_err(dev, "Error: incorrect capture volume resolution\n");
 920                         return -EINVAL;
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int
 927 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 928 {
 929         struct f_uac2 *uac2 = func_to_uac2(fn);
 930         struct g_audio *agdev = func_to_g_audio(fn);
 931         struct usb_composite_dev *cdev = cfg->cdev;
 932         struct usb_gadget *gadget = cdev->gadget;
 933         struct device *dev = &gadget->dev;
 934         struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
 935         struct usb_string *us;
 936         int ret;
 937
 938         ret = afunc_validate_opts(agdev, dev);
 939         if (ret)
 940                 return ret;
 941
 942         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
 943         if (IS_ERR(us))
 944                 return PTR_ERR(us);
 945
 946         if (FUOUT_EN(uac2_opts)) {
 947                 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
 948                 if (!out_feature_unit_desc)
 949                         return -ENOMEM;
 950         }
 951         if (FUIN_EN(uac2_opts)) {
 952                 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
 953                 if (!in_feature_unit_desc) {
 954                         ret = -ENOMEM;
 955                         goto err_free_fu;
 956                 }
 957         }
 958
 959         iad_desc.iFunction = us[STR_ASSOC].id;
 960         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
 961         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
 962         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
 963         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
 964         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
 965         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
 966         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
 967         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
 968         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
 969         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
 970         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
 971
 972         if (FUOUT_EN(uac2_opts)) {
 973                 u8 *i_feature = (u8 *)out_feature_unit_desc +
 974                                 out_feature_unit_desc->bLength - 1;
 975                 *i_feature = us[STR_FU_OUT].id;
 976         }
 977         if (FUIN_EN(uac2_opts)) {
 978                 u8 *i_feature = (u8 *)in_feature_unit_desc +
 979                                 in_feature_unit_desc->bLength - 1;
 980                 *i_feature = us[STR_FU_IN].id;
 981         }
 982
 983
 984         /* Initialize the configurable parameters */
 985         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
 986         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
 987         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
 988         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
 989         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
 990         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
 991         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
 992         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
 993         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
 994         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
 995         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
 996         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
 997         if (FUOUT_EN(uac2_opts)) {
 998                 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
 999                 u32 control = 0;
1000
1001                 if (uac2_opts->c_mute_present)
1002                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1003                 if (uac2_opts->c_volume_present)
1004                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1005                 *bma = cpu_to_le32(control);
1006         }
1007         if (FUIN_EN(uac2_opts)) {
1008                 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1009                 u32 control = 0;
1010
1011                 if (uac2_opts->p_mute_present)
1012                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1013                 if (uac2_opts->p_volume_present)
1014                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1015                 *bma = cpu_to_le32(control);
1016         }
1017
1018         snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1019         snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1020
1021         ret = usb_interface_id(cfg, fn);
1022         if (ret < 0) {
1023                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1024                 goto err_free_fu;
1025         }
1026         iad_desc.bFirstInterface = ret;
1027
1028         std_ac_if_desc.bInterfaceNumber = ret;
1029         uac2->ac_intf = ret;
1030         uac2->ac_alt = 0;
1031
1032         if (EPOUT_EN(uac2_opts)) {
1033                 ret = usb_interface_id(cfg, fn);
1034                 if (ret < 0) {
1035                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1036                         goto err_free_fu;
1037                 }
1038                 std_as_out_if0_desc.bInterfaceNumber = ret;
1039                 std_as_out_if1_desc.bInterfaceNumber = ret;
1040                 uac2->as_out_intf = ret;
1041                 uac2->as_out_alt = 0;
1042
1043                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1044                         fs_epout_desc.bmAttributes =
1045                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1046                         hs_epout_desc.bmAttributes =
1047                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1048                         ss_epout_desc.bmAttributes =
1049                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1050                         std_as_out_if1_desc.bNumEndpoints++;
1051                 } else {
1052                         fs_epout_desc.bmAttributes =
1053                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1054                         hs_epout_desc.bmAttributes =
1055                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1056                         ss_epout_desc.bmAttributes =
1057                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1058                 }
1059         }
1060
1061         if (EPIN_EN(uac2_opts)) {
1062                 ret = usb_interface_id(cfg, fn);
1063                 if (ret < 0) {
1064                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1065                         goto err_free_fu;
1066                 }
1067                 std_as_in_if0_desc.bInterfaceNumber = ret;
1068                 std_as_in_if1_desc.bInterfaceNumber = ret;
1069                 uac2->as_in_intf = ret;
1070                 uac2->as_in_alt = 0;
1071         }
1072
1073         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1074                 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1075                 if (!uac2->int_ep) {
1076                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1077                         ret = -ENODEV;
1078                         goto err_free_fu;
1079                 }
1080
1081                 std_ac_if_desc.bNumEndpoints = 1;
1082         }
1083
1084         /* Calculate wMaxPacketSize according to audio bandwidth */
1085         ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
1086                                      true);
1087         if (ret < 0) {
1088                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1089                 return ret;
1090         }
1091
1092         ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
1093                                      false);
1094         if (ret < 0) {
1095                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1096                 return ret;
1097         }
1098
1099         ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
1100                                      true);
1101         if (ret < 0) {
1102                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1103                 return ret;
1104         }
1105
1106         ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
1107                                      false);
1108         if (ret < 0) {
1109                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1110                 return ret;
1111         }
1112
1113         ret = set_ep_max_packet_size(uac2_opts, &ss_epin_desc, USB_SPEED_SUPER,
1114                                      true);
1115         if (ret < 0) {
1116                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1117                 return ret;
1118         }
1119
1120         ret = set_ep_max_packet_size(uac2_opts, &ss_epout_desc, USB_SPEED_SUPER,
1121                                      false);
1122         if (ret < 0) {
1123                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1124                 return ret;
1125         }
1126
1127         if (EPOUT_EN(uac2_opts)) {
1128                 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1129                 if (!agdev->out_ep) {
1130                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1131                         ret = -ENODEV;
1132                         goto err_free_fu;
1133                 }
1134                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1135                         agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1136                                                        &fs_epin_fback_desc);
1137                         if (!agdev->in_ep_fback) {
1138                                 dev_err(dev, "%s:%d Error!\n",
1139                                         __func__, __LINE__);
1140                                 ret = -ENODEV;
1141                                 goto err_free_fu;
1142                         }
1143                 }
1144         }
1145
1146         if (EPIN_EN(uac2_opts)) {
1147                 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1148                 if (!agdev->in_ep) {
1149                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1150                         ret = -ENODEV;
1151                         goto err_free_fu;
1152                 }
1153         }
1154
1155         agdev->in_ep_maxpsize = max_t(u16,
1156                                 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1157                                 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1158         agdev->out_ep_maxpsize = max_t(u16,
1159                                 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1160                                 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1161
1162         agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1163                                 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1164         agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1165                                 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1166
1167         // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1168         hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1169         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1170         hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1171         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1172         ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1173         ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1174         ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1175         ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1176
1177         setup_descriptor(uac2_opts);
1178
1179         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1180                                      ss_audio_desc);
1181         if (ret)
1182                 goto err_free_fu;
1183
1184         agdev->gadget = gadget;
1185
1186         agdev->params.p_chmask = uac2_opts->p_chmask;
1187         agdev->params.p_srate = uac2_opts->p_srate;
1188         agdev->params.p_ssize = uac2_opts->p_ssize;
1189         if (FUIN_EN(uac2_opts)) {
1190                 agdev->params.p_fu.id = USB_IN_FU_ID;
1191                 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1192                 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1193                 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1194                 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1195                 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1196         }
1197         agdev->params.c_chmask = uac2_opts->c_chmask;
1198         agdev->params.c_srate = uac2_opts->c_srate;
1199         agdev->params.c_ssize = uac2_opts->c_ssize;
1200         if (FUOUT_EN(uac2_opts)) {
1201                 agdev->params.c_fu.id = USB_OUT_FU_ID;
1202                 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1203                 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1204                 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1205                 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1206                 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1207         }
1208         agdev->params.req_number = uac2_opts->req_number;
1209         agdev->params.fb_max = uac2_opts->fb_max;
1210
1211         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1212     agdev->notify = afunc_notify;
1213
1214         ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1215         if (ret)
1216                 goto err_free_descs;
1217
1218         return 0;
1219
1220 err_free_descs:
1221         usb_free_all_descriptors(fn);
1222         agdev->gadget = NULL;
1223 err_free_fu:
1224         kfree(out_feature_unit_desc);
1225         out_feature_unit_desc = NULL;
1226         kfree(in_feature_unit_desc);
1227         in_feature_unit_desc = NULL;
1228         return ret;
1229 }
1230
1231 static void
1232 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1233 {
1234         struct g_audio *agdev = req->context;
1235         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1236
1237         atomic_dec(&uac2->int_count);
1238         kfree(req->buf);
1239         usb_ep_free_request(_ep, req);
1240 }
1241
1242 static int
1243 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1244 {
1245         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1246         struct usb_request *req;
1247         struct uac2_interrupt_data_msg *msg;
1248         u16 w_index, w_value;
1249         int ret;
1250
1251         if (!uac2->int_ep->enabled)
1252                 return 0;
1253
1254         if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1255                 atomic_dec(&uac2->int_count);
1256                 return 0;
1257         }
1258
1259         req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1260         if (req == NULL) {
1261                 ret = -ENOMEM;
1262                 goto err_dec_int_count;
1263         }
1264
1265         msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1266         if (msg == NULL) {
1267                 ret = -ENOMEM;
1268                 goto err_free_request;
1269         }
1270
1271         w_index = unit_id << 8 | uac2->ac_intf;
1272         w_value = cs << 8;
1273
1274         msg->bInfo = 0; /* Non-vendor, interface interrupt */
1275         msg->bAttribute = UAC2_CS_CUR;
1276         msg->wIndex = cpu_to_le16(w_index);
1277         msg->wValue = cpu_to_le16(w_value);
1278
1279         req->length = sizeof(*msg);
1280         req->buf = msg;
1281         req->context = agdev;
1282         req->complete = afunc_notify_complete;
1283
1284         ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1285
1286         if (ret)
1287                 goto err_free_msg;
1288
1289         return 0;
1290
1291 err_free_msg:
1292         kfree(msg);
1293 err_free_request:
1294         usb_ep_free_request(uac2->int_ep, req);
1295 err_dec_int_count:
1296         atomic_dec(&uac2->int_count);
1297
1298         return ret;
1299 }
1300
1301 static int
1302 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1303 {
1304         struct usb_composite_dev *cdev = fn->config->cdev;
1305         struct f_uac2 *uac2 = func_to_uac2(fn);
1306         struct g_audio *agdev = func_to_g_audio(fn);
1307         struct usb_gadget *gadget = cdev->gadget;
1308         struct device *dev = &gadget->dev;
1309         int ret = 0;
1310
1311         /* No i/f has more than 2 alt settings */
1312         if (alt > 1) {
1313                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1314                 return -EINVAL;
1315         }
1316
1317         if (intf == uac2->ac_intf) {
1318                 /* Control I/f has only 1 AltSetting - 0 */
1319                 if (alt) {
1320                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1321                         return -EINVAL;
1322                 }
1323
1324                 /* restart interrupt endpoint */
1325                 if (uac2->int_ep) {
1326                         usb_ep_disable(uac2->int_ep);
1327                         config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1328                         usb_ep_enable(uac2->int_ep);
1329                 }
1330
1331                 return 0;
1332         }
1333
1334         if (intf == uac2->as_out_intf) {
1335                 uac2->as_out_alt = alt;
1336
1337                 if (alt)
1338                         ret = u_audio_start_capture(&uac2->g_audio);
1339                 else
1340                         u_audio_stop_capture(&uac2->g_audio);
1341         } else if (intf == uac2->as_in_intf) {
1342                 uac2->as_in_alt = alt;
1343
1344                 if (alt)
1345                         ret = u_audio_start_playback(&uac2->g_audio);
1346                 else
1347                         u_audio_stop_playback(&uac2->g_audio);
1348         } else {
1349                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1350                 return -EINVAL;
1351         }
1352
1353         return ret;
1354 }
1355
1356 static int
1357 afunc_get_alt(struct usb_function *fn, unsigned intf)
1358 {
1359         struct f_uac2 *uac2 = func_to_uac2(fn);
1360         struct g_audio *agdev = func_to_g_audio(fn);
1361
1362         if (intf == uac2->ac_intf)
1363                 return uac2->ac_alt;
1364         else if (intf == uac2->as_out_intf)
1365                 return uac2->as_out_alt;
1366         else if (intf == uac2->as_in_intf)
1367                 return uac2->as_in_alt;
1368         else
1369                 dev_err(&agdev->gadget->dev,
1370                         "%s:%d Invalid Interface %d!\n",
1371                         __func__, __LINE__, intf);
1372
1373         return -EINVAL;
1374 }
1375
1376 static void
1377 afunc_disable(struct usb_function *fn)
1378 {
1379         struct f_uac2 *uac2 = func_to_uac2(fn);
1380
1381         uac2->as_in_alt = 0;
1382         uac2->as_out_alt = 0;
1383         u_audio_stop_capture(&uac2->g_audio);
1384         u_audio_stop_playback(&uac2->g_audio);
1385         if (uac2->int_ep)
1386                 usb_ep_disable(uac2->int_ep);
1387 }
1388
1389 static int
1390 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1391 {
1392         struct usb_request *req = fn->config->cdev->req;
1393         struct g_audio *agdev = func_to_g_audio(fn);
1394         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1395         u16 w_length = le16_to_cpu(cr->wLength);
1396         u16 w_index = le16_to_cpu(cr->wIndex);
1397         u16 w_value = le16_to_cpu(cr->wValue);
1398         u8 entity_id = (w_index >> 8) & 0xff;
1399         u8 control_selector = w_value >> 8;
1400         int value = -EOPNOTSUPP;
1401         int p_srate, c_srate;
1402
1403         p_srate = opts->p_srate;
1404         c_srate = opts->c_srate;
1405
1406         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1407                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1408                         struct cntrl_cur_lay3 c;
1409
1410                         memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1411
1412                         if (entity_id == USB_IN_CLK_ID)
1413                                 c.dCUR = cpu_to_le32(p_srate);
1414                         else if (entity_id == USB_OUT_CLK_ID)
1415                                 c.dCUR = cpu_to_le32(c_srate);
1416
1417                         value = min_t(unsigned int, w_length, sizeof(c));
1418                         memcpy(req->buf, &c, value);
1419                 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1420                         *(u8 *)req->buf = 1;
1421                         value = min_t(unsigned int, w_length, 1);
1422                 } else {
1423                         dev_err(&agdev->gadget->dev,
1424                                 "%s:%d control_selector=%d TODO!\n",
1425                                 __func__, __LINE__, control_selector);
1426                 }
1427         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1428                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1429                 unsigned int is_playback = 0;
1430
1431                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1432                         is_playback = 1;
1433
1434                 if (control_selector == UAC_FU_MUTE) {
1435                         unsigned int mute;
1436
1437                         u_audio_get_mute(agdev, is_playback, &mute);
1438
1439                         *(u8 *)req->buf = mute;
1440                         value = min_t(unsigned int, w_length, 1);
1441                 } else if (control_selector == UAC_FU_VOLUME) {
1442                         struct cntrl_cur_lay2 c;
1443                         s16 volume;
1444
1445                         memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1446
1447                         u_audio_get_volume(agdev, is_playback, &volume);
1448                         c.wCUR = cpu_to_le16(volume);
1449
1450                         value = min_t(unsigned int, w_length, sizeof(c));
1451                         memcpy(req->buf, &c, value);
1452                 } else {
1453                         dev_err(&agdev->gadget->dev,
1454                                 "%s:%d control_selector=%d TODO!\n",
1455                                 __func__, __LINE__, control_selector);
1456                 }
1457         } else {
1458                 dev_err(&agdev->gadget->dev,
1459                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1460                         __func__, __LINE__, entity_id, control_selector);
1461         }
1462
1463         return value;
1464 }
1465
1466 static int
1467 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1468 {
1469         struct usb_request *req = fn->config->cdev->req;
1470         struct g_audio *agdev = func_to_g_audio(fn);
1471         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1472         u16 w_length = le16_to_cpu(cr->wLength);
1473         u16 w_index = le16_to_cpu(cr->wIndex);
1474         u16 w_value = le16_to_cpu(cr->wValue);
1475         u8 entity_id = (w_index >> 8) & 0xff;
1476         u8 control_selector = w_value >> 8;
1477         int value = -EOPNOTSUPP;
1478         int p_srate, c_srate;
1479
1480         p_srate = opts->p_srate;
1481         c_srate = opts->c_srate;
1482
1483         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1484                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1485                         struct cntrl_range_lay3 r;
1486
1487                         if (entity_id == USB_IN_CLK_ID)
1488                                 r.dMIN = cpu_to_le32(p_srate);
1489                         else if (entity_id == USB_OUT_CLK_ID)
1490                                 r.dMIN = cpu_to_le32(c_srate);
1491                         else
1492                                 return -EOPNOTSUPP;
1493
1494                         r.dMAX = r.dMIN;
1495                         r.dRES = 0;
1496                         r.wNumSubRanges = cpu_to_le16(1);
1497
1498                         value = min_t(unsigned int, w_length, sizeof(r));
1499                         memcpy(req->buf, &r, value);
1500                 } else {
1501                         dev_err(&agdev->gadget->dev,
1502                                 "%s:%d control_selector=%d TODO!\n",
1503                                 __func__, __LINE__, control_selector);
1504                 }
1505         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1506                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1507                 unsigned int is_playback = 0;
1508
1509                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1510                         is_playback = 1;
1511
1512                 if (control_selector == UAC_FU_VOLUME) {
1513                         struct cntrl_range_lay2 r;
1514                         s16 max_db, min_db, res_db;
1515
1516                         if (is_playback) {
1517                                 max_db = opts->p_volume_max;
1518                                 min_db = opts->p_volume_min;
1519                                 res_db = opts->p_volume_res;
1520                         } else {
1521                                 max_db = opts->c_volume_max;
1522                                 min_db = opts->c_volume_min;
1523                                 res_db = opts->c_volume_res;
1524                         }
1525
1526                         r.wMAX = cpu_to_le16(max_db);
1527                         r.wMIN = cpu_to_le16(min_db);
1528                         r.wRES = cpu_to_le16(res_db);
1529                         r.wNumSubRanges = cpu_to_le16(1);
1530
1531                         value = min_t(unsigned int, w_length, sizeof(r));
1532                         memcpy(req->buf, &r, value);
1533                 } else {
1534                         dev_err(&agdev->gadget->dev,
1535                                 "%s:%d control_selector=%d TODO!\n",
1536                                 __func__, __LINE__, control_selector);
1537                 }
1538         } else {
1539                 dev_err(&agdev->gadget->dev,
1540                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1541                         __func__, __LINE__, entity_id, control_selector);
1542         }
1543
1544         return value;
1545 }
1546
1547 static int
1548 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1549 {
1550         if (cr->bRequest == UAC2_CS_CUR)
1551                 return in_rq_cur(fn, cr);
1552         else if (cr->bRequest == UAC2_CS_RANGE)
1553                 return in_rq_range(fn, cr);
1554         else
1555                 return -EOPNOTSUPP;
1556 }
1557
1558 static void
1559 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1560 {
1561         struct g_audio *agdev = req->context;
1562         struct usb_composite_dev *cdev = agdev->func.config->cdev;
1563         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1564         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1565         struct usb_ctrlrequest *cr = &uac2->setup_cr;
1566         u16 w_index = le16_to_cpu(cr->wIndex);
1567         u16 w_value = le16_to_cpu(cr->wValue);
1568         u8 entity_id = (w_index >> 8) & 0xff;
1569         u8 control_selector = w_value >> 8;
1570
1571         if (req->status != 0) {
1572                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1573                 return;
1574         }
1575
1576         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1577                 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1578                 unsigned int is_playback = 0;
1579
1580                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1581                         is_playback = 1;
1582
1583                 if (control_selector == UAC_FU_MUTE) {
1584                         u8 mute = *(u8 *)req->buf;
1585
1586                         u_audio_set_mute(agdev, is_playback, mute);
1587
1588                         return;
1589                 } else if (control_selector == UAC_FU_VOLUME) {
1590                         struct cntrl_cur_lay2 *c = req->buf;
1591                         s16 volume;
1592
1593                         volume = le16_to_cpu(c->wCUR);
1594                         u_audio_set_volume(agdev, is_playback, volume);
1595
1596                         return;
1597                 } else {
1598                         dev_err(&agdev->gadget->dev,
1599                                 "%s:%d control_selector=%d TODO!\n",
1600                                 __func__, __LINE__, control_selector);
1601                         usb_ep_set_halt(ep);
1602                 }
1603         }
1604 }
1605
1606 static int
1607 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1608 {
1609         struct usb_request *req = fn->config->cdev->req;
1610         struct g_audio *agdev = func_to_g_audio(fn);
1611         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1612         struct f_uac2 *uac2 = func_to_uac2(fn);
1613         u16 w_length = le16_to_cpu(cr->wLength);
1614         u16 w_index = le16_to_cpu(cr->wIndex);
1615         u16 w_value = le16_to_cpu(cr->wValue);
1616         u8 entity_id = (w_index >> 8) & 0xff;
1617         u8 control_selector = w_value >> 8;
1618
1619         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1620                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1621                         return w_length;
1622         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1623                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1624                 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1625                 req->context = agdev;
1626                 req->complete = out_rq_cur_complete;
1627
1628                 return w_length;
1629         } else {
1630                 dev_err(&agdev->gadget->dev,
1631                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1632                         __func__, __LINE__, entity_id, control_selector);
1633         }
1634         return -EOPNOTSUPP;
1635 }
1636
1637 static int
1638 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1639 {
1640         struct f_uac2 *uac2 = func_to_uac2(fn);
1641         struct g_audio *agdev = func_to_g_audio(fn);
1642         u16 w_index = le16_to_cpu(cr->wIndex);
1643         u8 intf = w_index & 0xff;
1644
1645         if (intf != uac2->ac_intf) {
1646                 dev_err(&agdev->gadget->dev,
1647                         "%s:%d Error!\n", __func__, __LINE__);
1648                 return -EOPNOTSUPP;
1649         }
1650
1651         if (cr->bRequestType & USB_DIR_IN)
1652                 return ac_rq_in(fn, cr);
1653         else if (cr->bRequest == UAC2_CS_CUR)
1654                 return out_rq_cur(fn, cr);
1655
1656         return -EOPNOTSUPP;
1657 }
1658
1659 static int
1660 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1661 {
1662         struct usb_composite_dev *cdev = fn->config->cdev;
1663         struct g_audio *agdev = func_to_g_audio(fn);
1664         struct usb_request *req = cdev->req;
1665         u16 w_length = le16_to_cpu(cr->wLength);
1666         int value = -EOPNOTSUPP;
1667
1668         /* Only Class specific requests are supposed to reach here */
1669         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1670                 return -EOPNOTSUPP;
1671
1672         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1673                 value = setup_rq_inf(fn, cr);
1674         else
1675                 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1676                                 __func__, __LINE__);
1677
1678         if (value >= 0) {
1679                 req->length = value;
1680                 req->zero = value < w_length;
1681                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1682                 if (value < 0) {
1683                         dev_err(&agdev->gadget->dev,
1684                                 "%s:%d Error!\n", __func__, __LINE__);
1685                         req->status = 0;
1686                 }
1687         }
1688
1689         return value;
1690 }
1691
1692 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1693 {
1694         return container_of(to_config_group(item), struct f_uac2_opts,
1695                             func_inst.group);
1696 }
1697
1698 static void f_uac2_attr_release(struct config_item *item)
1699 {
1700         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1701
1702         usb_put_function_instance(&opts->func_inst);
1703 }
1704
1705 static struct configfs_item_operations f_uac2_item_ops = {
1706         .release        = f_uac2_attr_release,
1707 };
1708
1709 #define uac2_kstrtou32 kstrtou32
1710 #define uac2_kstrtos16 kstrtos16
1711 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1712
1713 static const char *u32_fmt = "%u\n";
1714 static const char *s16_fmt = "%hd\n";
1715 static const char *bool_fmt = "%u\n";
1716
1717 #define UAC2_ATTRIBUTE(type, name)                                      \
1718 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1719                                          char *page)                    \
1720 {                                                                       \
1721         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1722         int result;                                                     \
1723                                                                         \
1724         mutex_lock(&opts->lock);                                        \
1725         result = sprintf(page, type##_fmt, opts->name);                 \
1726         mutex_unlock(&opts->lock);                                      \
1727                                                                         \
1728         return result;                                                  \
1729 }                                                                       \
1730                                                                         \
1731 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1732                                           const char *page, size_t len) \
1733 {                                                                       \
1734         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1735         int ret;                                                        \
1736         type num;                                                       \
1737                                                                         \
1738         mutex_lock(&opts->lock);                                        \
1739         if (opts->refcnt) {                                             \
1740                 ret = -EBUSY;                                           \
1741                 goto end;                                               \
1742         }                                                               \
1743                                                                         \
1744         ret = uac2_kstrto##type(page, 0, &num);                         \
1745         if (ret)                                                        \
1746                 goto end;                                               \
1747                                                                         \
1748         opts->name = num;                                               \
1749         ret = len;                                                      \
1750                                                                         \
1751 end:                                                                    \
1752         mutex_unlock(&opts->lock);                                      \
1753         return ret;                                                     \
1754 }                                                                       \
1755                                                                         \
1756 CONFIGFS_ATTR(f_uac2_opts_, name)
1757
1758 #define UAC2_ATTRIBUTE_SYNC(name)                                       \
1759 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1760                                          char *page)                    \
1761 {                                                                       \
1762         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1763         int result;                                                     \
1764         char *str;                                                      \
1765                                                                         \
1766         mutex_lock(&opts->lock);                                        \
1767         switch (opts->name) {                                           \
1768         case USB_ENDPOINT_SYNC_ASYNC:                                   \
1769                 str = "async";                                          \
1770                 break;                                                  \
1771         case USB_ENDPOINT_SYNC_ADAPTIVE:                                \
1772                 str = "adaptive";                                       \
1773                 break;                                                  \
1774         default:                                                        \
1775                 str = "unknown";                                        \
1776                 break;                                                  \
1777         }                                                               \
1778         result = sprintf(page, "%s\n", str);                            \
1779         mutex_unlock(&opts->lock);                                      \
1780                                                                         \
1781         return result;                                                  \
1782 }                                                                       \
1783                                                                         \
1784 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1785                                           const char *page, size_t len) \
1786 {                                                                       \
1787         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1788         int ret = 0;                                                    \
1789                                                                         \
1790         mutex_lock(&opts->lock);                                        \
1791         if (opts->refcnt) {                                             \
1792                 ret = -EBUSY;                                           \
1793                 goto end;                                               \
1794         }                                                               \
1795                                                                         \
1796         if (!strncmp(page, "async", 5))                                 \
1797                 opts->name = USB_ENDPOINT_SYNC_ASYNC;                   \
1798         else if (!strncmp(page, "adaptive", 8))                         \
1799                 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE;                \
1800         else {                                                          \
1801                 ret = -EINVAL;                                          \
1802                 goto end;                                               \
1803         }                                                               \
1804                                                                         \
1805         ret = len;                                                      \
1806                                                                         \
1807 end:                                                                    \
1808         mutex_unlock(&opts->lock);                                      \
1809         return ret;                                                     \
1810 }                                                                       \
1811                                                                         \
1812 CONFIGFS_ATTR(f_uac2_opts_, name)
1813
1814 UAC2_ATTRIBUTE(u32, p_chmask);
1815 UAC2_ATTRIBUTE(u32, p_srate);
1816 UAC2_ATTRIBUTE(u32, p_ssize);
1817 UAC2_ATTRIBUTE(u32, c_chmask);
1818 UAC2_ATTRIBUTE(u32, c_srate);
1819 UAC2_ATTRIBUTE_SYNC(c_sync);
1820 UAC2_ATTRIBUTE(u32, c_ssize);
1821 UAC2_ATTRIBUTE(u32, req_number);
1822
1823 UAC2_ATTRIBUTE(bool, p_mute_present);
1824 UAC2_ATTRIBUTE(bool, p_volume_present);
1825 UAC2_ATTRIBUTE(s16, p_volume_min);
1826 UAC2_ATTRIBUTE(s16, p_volume_max);
1827 UAC2_ATTRIBUTE(s16, p_volume_res);
1828
1829 UAC2_ATTRIBUTE(bool, c_mute_present);
1830 UAC2_ATTRIBUTE(bool, c_volume_present);
1831 UAC2_ATTRIBUTE(s16, c_volume_min);
1832 UAC2_ATTRIBUTE(s16, c_volume_max);
1833 UAC2_ATTRIBUTE(s16, c_volume_res);
1834 UAC2_ATTRIBUTE(u32, fb_max);
1835
1836 static struct configfs_attribute *f_uac2_attrs[] = {
1837         &f_uac2_opts_attr_p_chmask,
1838         &f_uac2_opts_attr_p_srate,
1839         &f_uac2_opts_attr_p_ssize,
1840         &f_uac2_opts_attr_c_chmask,
1841         &f_uac2_opts_attr_c_srate,
1842         &f_uac2_opts_attr_c_ssize,
1843         &f_uac2_opts_attr_c_sync,
1844         &f_uac2_opts_attr_req_number,
1845         &f_uac2_opts_attr_fb_max,
1846
1847         &f_uac2_opts_attr_p_mute_present,
1848         &f_uac2_opts_attr_p_volume_present,
1849         &f_uac2_opts_attr_p_volume_min,
1850         &f_uac2_opts_attr_p_volume_max,
1851         &f_uac2_opts_attr_p_volume_res,
1852
1853         &f_uac2_opts_attr_c_mute_present,
1854         &f_uac2_opts_attr_c_volume_present,
1855         &f_uac2_opts_attr_c_volume_min,
1856         &f_uac2_opts_attr_c_volume_max,
1857         &f_uac2_opts_attr_c_volume_res,
1858
1859         NULL,
1860 };
1861
1862 static const struct config_item_type f_uac2_func_type = {
1863         .ct_item_ops    = &f_uac2_item_ops,
1864         .ct_attrs       = f_uac2_attrs,
1865         .ct_owner       = THIS_MODULE,
1866 };
1867
1868 static void afunc_free_inst(struct usb_function_instance *f)
1869 {
1870         struct f_uac2_opts *opts;
1871
1872         opts = container_of(f, struct f_uac2_opts, func_inst);
1873         kfree(opts);
1874 }
1875
1876 static struct usb_function_instance *afunc_alloc_inst(void)
1877 {
1878         struct f_uac2_opts *opts;
1879
1880         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1881         if (!opts)
1882                 return ERR_PTR(-ENOMEM);
1883
1884         mutex_init(&opts->lock);
1885         opts->func_inst.free_func_inst = afunc_free_inst;
1886
1887         config_group_init_type_name(&opts->func_inst.group, "",
1888                                     &f_uac2_func_type);
1889
1890         opts->p_chmask = UAC2_DEF_PCHMASK;
1891         opts->p_srate = UAC2_DEF_PSRATE;
1892         opts->p_ssize = UAC2_DEF_PSSIZE;
1893         opts->c_chmask = UAC2_DEF_CCHMASK;
1894         opts->c_srate = UAC2_DEF_CSRATE;
1895         opts->c_ssize = UAC2_DEF_CSSIZE;
1896         opts->c_sync = UAC2_DEF_CSYNC;
1897
1898         opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
1899         opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
1900         opts->p_volume_min = UAC2_DEF_MIN_DB;
1901         opts->p_volume_max = UAC2_DEF_MAX_DB;
1902         opts->p_volume_res = UAC2_DEF_RES_DB;
1903
1904         opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
1905         opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
1906         opts->c_volume_min = UAC2_DEF_MIN_DB;
1907         opts->c_volume_max = UAC2_DEF_MAX_DB;
1908         opts->c_volume_res = UAC2_DEF_RES_DB;
1909
1910         opts->req_number = UAC2_DEF_REQ_NUM;
1911         opts->fb_max = UAC2_DEF_FB_MAX;
1912         return &opts->func_inst;
1913 }
1914
1915 static void afunc_free(struct usb_function *f)
1916 {
1917         struct g_audio *agdev;
1918         struct f_uac2_opts *opts;
1919
1920         agdev = func_to_g_audio(f);
1921         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1922         kfree(agdev);
1923         mutex_lock(&opts->lock);
1924         --opts->refcnt;
1925         mutex_unlock(&opts->lock);
1926 }
1927
1928 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1929 {
1930         struct g_audio *agdev = func_to_g_audio(f);
1931
1932         g_audio_cleanup(agdev);
1933         usb_free_all_descriptors(f);
1934
1935         agdev->gadget = NULL;
1936
1937         kfree(out_feature_unit_desc);
1938         out_feature_unit_desc = NULL;
1939         kfree(in_feature_unit_desc);
1940         in_feature_unit_desc = NULL;
1941 }
1942
1943 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1944 {
1945         struct f_uac2   *uac2;
1946         struct f_uac2_opts *opts;
1947
1948         uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
1949         if (uac2 == NULL)
1950                 return ERR_PTR(-ENOMEM);
1951
1952         opts = container_of(fi, struct f_uac2_opts, func_inst);
1953         mutex_lock(&opts->lock);
1954         ++opts->refcnt;
1955         mutex_unlock(&opts->lock);
1956
1957         uac2->g_audio.func.name = "uac2_func";
1958         uac2->g_audio.func.bind = afunc_bind;
1959         uac2->g_audio.func.unbind = afunc_unbind;
1960         uac2->g_audio.func.set_alt = afunc_set_alt;
1961         uac2->g_audio.func.get_alt = afunc_get_alt;
1962         uac2->g_audio.func.disable = afunc_disable;
1963         uac2->g_audio.func.setup = afunc_setup;
1964         uac2->g_audio.func.free_func = afunc_free;
1965
1966         return &uac2->g_audio.func;
1967 }
1968
1969 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1970 MODULE_LICENSE("GPL");
1971 MODULE_AUTHOR("Yadwinder Singh");
1972 MODULE_AUTHOR("Jaswinder Singh");
1973 MODULE_AUTHOR("Ruslan Bilovol");