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 ([email protected])
   7  *    Jaswinder Singh ([email protected])
   8  *
   9  * Copyright (C) 2020
  10  *    Ruslan Bilovol ([email protected])
  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
  19 #include "u_uac2.h"
  20
  21 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
  22 #define UAC2_CHANNEL_MASK 0x07FFFFFF
  23
  24 /*
  25  * The driver implements a simple UAC_2 topology.
  26  * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
  27  * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
  28  * Capture and Playback sampling rates are independently
  29  *  controlled by two clock sources :
  30  *    CLK_5 := c_srate, and CLK_6 := p_srate
  31  */
  32 #define USB_OUT_CLK_ID  (out_clk_src_desc.bClockID)
  33 #define USB_IN_CLK_ID   (in_clk_src_desc.bClockID)
  34 #define USB_OUT_FU_ID   (out_feature_unit_desc->bUnitID)
  35 #define USB_IN_FU_ID    (in_feature_unit_desc->bUnitID)
  36
  37 #define CONTROL_ABSENT  0
  38 #define CONTROL_RDONLY  1
  39 #define CONTROL_RDWR    3
  40
  41 #define CLK_FREQ_CTRL   0
  42 #define CLK_VLD_CTRL    2
  43 #define FU_MUTE_CTRL    0
  44 #define FU_VOL_CTRL     2
  45
  46 #define COPY_CTRL       0
  47 #define CONN_CTRL       2
  48 #define OVRLD_CTRL      4
  49 #define CLSTR_CTRL      6
  50 #define UNFLW_CTRL      8
  51 #define OVFLW_CTRL      10
  52
  53 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
  54 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
  55 #define FUIN_EN(_opts) (EPIN_EN(_opts) \
  56                                 && ((_opts)->p_mute_present \
  57                                 || (_opts)->p_volume_present))
  58 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
  59                                 && ((_opts)->c_mute_present \
  60                                 || (_opts)->c_volume_present))
  61 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
  62
  63 struct f_uac2 {
  64         struct g_audio g_audio;
  65         u8 ac_intf, as_in_intf, as_out_intf;
  66         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  67
  68         struct usb_ctrlrequest setup_cr;        /* will be used in data stage */
  69
  70         /* Interrupt IN endpoint of AC interface */
  71         struct usb_ep   *int_ep;
  72         atomic_t        int_count;
  73         /* transient state, only valid during handling of a single control request */
  74         int clock_id;
  75 };
  76
  77 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
  78 {
  79         return container_of(f, struct f_uac2, g_audio.func);
  80 }
  81
  82 static inline
  83 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
  84 {
  85         return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
  86 }
  87
  88 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
  89
  90 /* --------- USB Function Interface ------------- */
  91
  92 enum {
  93         STR_ASSOC,
  94         STR_IF_CTRL,
  95         STR_CLKSRC_IN,
  96         STR_CLKSRC_OUT,
  97         STR_USB_IT,
  98         STR_IO_IT,
  99         STR_USB_OT,
 100         STR_IO_OT,
 101         STR_FU_IN,
 102         STR_FU_OUT,
 103         STR_AS_OUT_ALT0,
 104         STR_AS_OUT_ALT1,
 105         STR_AS_IN_ALT0,
 106         STR_AS_IN_ALT1,
 107 };
 108
 109 static struct usb_string strings_fn[] = {
 110         /* [STR_ASSOC].s = DYNAMIC, */
 111         [STR_IF_CTRL].s = "Topology Control",
 112         [STR_CLKSRC_IN].s = "Input Clock",
 113         [STR_CLKSRC_OUT].s = "Output Clock",
 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 const char *const speed_names[] = {
 128         [USB_SPEED_UNKNOWN] = "UNKNOWN",
 129         [USB_SPEED_LOW] = "LS",
 130         [USB_SPEED_FULL] = "FS",
 131         [USB_SPEED_HIGH] = "HS",
 132         [USB_SPEED_WIRELESS] = "W",
 133         [USB_SPEED_SUPER] = "SS",
 134         [USB_SPEED_SUPER_PLUS] = "SS+",
 135 };
 136
 137 static struct usb_gadget_strings str_fn = {
 138         .language = 0x0409,     /* en-us */
 139         .strings = strings_fn,
 140 };
 141
 142 static struct usb_gadget_strings *fn_strings[] = {
 143         &str_fn,
 144         NULL,
 145 };
 146
 147 static struct usb_interface_assoc_descriptor iad_desc = {
 148         .bLength = sizeof iad_desc,
 149         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 150
 151         .bFirstInterface = 0,
 152         .bInterfaceCount = 3,
 153         .bFunctionClass = USB_CLASS_AUDIO,
 154         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 155         .bFunctionProtocol = UAC_VERSION_2,
 156 };
 157
 158 /* Audio Control Interface */
 159 static struct usb_interface_descriptor std_ac_if_desc = {
 160         .bLength = sizeof std_ac_if_desc,
 161         .bDescriptorType = USB_DT_INTERFACE,
 162
 163         .bAlternateSetting = 0,
 164         /* .bNumEndpoints = DYNAMIC */
 165         .bInterfaceClass = USB_CLASS_AUDIO,
 166         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 167         .bInterfaceProtocol = UAC_VERSION_2,
 168 };
 169
 170 /* Clock source for IN traffic */
 171 static struct uac_clock_source_descriptor in_clk_src_desc = {
 172         .bLength = sizeof in_clk_src_desc,
 173         .bDescriptorType = USB_DT_CS_INTERFACE,
 174
 175         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 176         /* .bClockID = DYNAMIC */
 177         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 178         .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
 179         .bAssocTerminal = 0,
 180 };
 181
 182 /* Clock source for OUT traffic */
 183 static struct uac_clock_source_descriptor out_clk_src_desc = {
 184         .bLength = sizeof out_clk_src_desc,
 185         .bDescriptorType = USB_DT_CS_INTERFACE,
 186
 187         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 188         /* .bClockID = DYNAMIC */
 189         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 190         .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
 191         .bAssocTerminal = 0,
 192 };
 193
 194 /* Input Terminal for USB_OUT */
 195 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
 196         .bLength = sizeof usb_out_it_desc,
 197         .bDescriptorType = USB_DT_CS_INTERFACE,
 198
 199         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 200         /* .bTerminalID = DYNAMIC */
 201         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 202         .bAssocTerminal = 0,
 203         /* .bCSourceID = DYNAMIC */
 204         .iChannelNames = 0,
 205         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 206 };
 207
 208 /* Input Terminal for I/O-In */
 209 static struct uac2_input_terminal_descriptor io_in_it_desc = {
 210         .bLength = sizeof io_in_it_desc,
 211         .bDescriptorType = USB_DT_CS_INTERFACE,
 212
 213         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 214         /* .bTerminalID = DYNAMIC */
 215         .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
 216         .bAssocTerminal = 0,
 217         /* .bCSourceID = DYNAMIC */
 218         .iChannelNames = 0,
 219         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 220 };
 221
 222 /* Ouput Terminal for USB_IN */
 223 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 224         .bLength = sizeof usb_in_ot_desc,
 225         .bDescriptorType = USB_DT_CS_INTERFACE,
 226
 227         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 228         /* .bTerminalID = DYNAMIC */
 229         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 230         .bAssocTerminal = 0,
 231         /* .bSourceID = DYNAMIC */
 232         /* .bCSourceID = DYNAMIC */
 233         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 234 };
 235
 236 /* Ouput Terminal for I/O-Out */
 237 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
 238         .bLength = sizeof io_out_ot_desc,
 239         .bDescriptorType = USB_DT_CS_INTERFACE,
 240
 241         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 242         /* .bTerminalID = DYNAMIC */
 243         .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
 244         .bAssocTerminal = 0,
 245         /* .bSourceID = DYNAMIC */
 246         /* .bCSourceID = DYNAMIC */
 247         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 248 };
 249
 250 static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
 251 static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
 252
 253 static struct uac2_ac_header_descriptor ac_hdr_desc = {
 254         .bLength = sizeof ac_hdr_desc,
 255         .bDescriptorType = USB_DT_CS_INTERFACE,
 256
 257         .bDescriptorSubtype = UAC_MS_HEADER,
 258         .bcdADC = cpu_to_le16(0x200),
 259         .bCategory = UAC2_FUNCTION_IO_BOX,
 260         /* .wTotalLength = DYNAMIC */
 261         .bmControls = 0,
 262 };
 263
 264 /* AC IN Interrupt Endpoint */
 265 static struct usb_endpoint_descriptor fs_ep_int_desc = {
 266         .bLength = USB_DT_ENDPOINT_SIZE,
 267         .bDescriptorType = USB_DT_ENDPOINT,
 268
 269         .bEndpointAddress = USB_DIR_IN,
 270         .bmAttributes = USB_ENDPOINT_XFER_INT,
 271         .wMaxPacketSize = cpu_to_le16(6),
 272         .bInterval = 1,
 273 };
 274
 275 static struct usb_endpoint_descriptor hs_ep_int_desc = {
 276         .bLength = USB_DT_ENDPOINT_SIZE,
 277         .bDescriptorType = USB_DT_ENDPOINT,
 278
 279         .bmAttributes = USB_ENDPOINT_XFER_INT,
 280         .wMaxPacketSize = cpu_to_le16(6),
 281         .bInterval = 4,
 282 };
 283
 284 static struct usb_endpoint_descriptor ss_ep_int_desc = {
 285         .bLength = USB_DT_ENDPOINT_SIZE,
 286         .bDescriptorType = USB_DT_ENDPOINT,
 287
 288         .bEndpointAddress = USB_DIR_IN,
 289         .bmAttributes = USB_ENDPOINT_XFER_INT,
 290         .wMaxPacketSize = cpu_to_le16(6),
 291         .bInterval = 4,
 292 };
 293
 294 /* Audio Streaming OUT Interface - Alt0 */
 295 static struct usb_interface_descriptor std_as_out_if0_desc = {
 296         .bLength = sizeof std_as_out_if0_desc,
 297         .bDescriptorType = USB_DT_INTERFACE,
 298
 299         .bAlternateSetting = 0,
 300         .bNumEndpoints = 0,
 301         .bInterfaceClass = USB_CLASS_AUDIO,
 302         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 303         .bInterfaceProtocol = UAC_VERSION_2,
 304 };
 305
 306 /* Audio Streaming OUT Interface - Alt1 */
 307 static struct usb_interface_descriptor std_as_out_if1_desc = {
 308         .bLength = sizeof std_as_out_if1_desc,
 309         .bDescriptorType = USB_DT_INTERFACE,
 310
 311         .bAlternateSetting = 1,
 312         .bNumEndpoints = 1,
 313         .bInterfaceClass = USB_CLASS_AUDIO,
 314         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 315         .bInterfaceProtocol = UAC_VERSION_2,
 316 };
 317
 318 /* Audio Stream OUT Intface Desc */
 319 static struct uac2_as_header_descriptor as_out_hdr_desc = {
 320         .bLength = sizeof as_out_hdr_desc,
 321         .bDescriptorType = USB_DT_CS_INTERFACE,
 322
 323         .bDescriptorSubtype = UAC_AS_GENERAL,
 324         /* .bTerminalLink = DYNAMIC */
 325         .bmControls = 0,
 326         .bFormatType = UAC_FORMAT_TYPE_I,
 327         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 328         .iChannelNames = 0,
 329 };
 330
 331 /* Audio USB_OUT Format */
 332 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 333         .bLength = sizeof as_out_fmt1_desc,
 334         .bDescriptorType = USB_DT_CS_INTERFACE,
 335         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 336         .bFormatType = UAC_FORMAT_TYPE_I,
 337 };
 338
 339 /* STD AS ISO OUT Endpoint */
 340 static struct usb_endpoint_descriptor fs_epout_desc = {
 341         .bLength = USB_DT_ENDPOINT_SIZE,
 342         .bDescriptorType = USB_DT_ENDPOINT,
 343
 344         .bEndpointAddress = USB_DIR_OUT,
 345         /* .bmAttributes = DYNAMIC */
 346         /* .wMaxPacketSize = DYNAMIC */
 347         .bInterval = 1,
 348 };
 349
 350 static struct usb_endpoint_descriptor hs_epout_desc = {
 351         .bLength = USB_DT_ENDPOINT_SIZE,
 352         .bDescriptorType = USB_DT_ENDPOINT,
 353
 354         /* .bmAttributes = DYNAMIC */
 355         /* .wMaxPacketSize = DYNAMIC */
 356         /* .bInterval = DYNAMIC */
 357 };
 358
 359 static struct usb_endpoint_descriptor ss_epout_desc = {
 360         .bLength = USB_DT_ENDPOINT_SIZE,
 361         .bDescriptorType = USB_DT_ENDPOINT,
 362
 363         .bEndpointAddress = USB_DIR_OUT,
 364         /* .bmAttributes = DYNAMIC */
 365         /* .wMaxPacketSize = DYNAMIC */
 366         /* .bInterval = DYNAMIC */
 367 };
 368
 369 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
 370         .bLength                = sizeof(ss_epout_desc_comp),
 371         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 372         .bMaxBurst              = 0,
 373         .bmAttributes           = 0,
 374         /* wBytesPerInterval = DYNAMIC */
 375 };
 376
 377 /* CS AS ISO OUT Endpoint */
 378 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 379         .bLength = sizeof as_iso_out_desc,
 380         .bDescriptorType = USB_DT_CS_ENDPOINT,
 381
 382         .bDescriptorSubtype = UAC_EP_GENERAL,
 383         .bmAttributes = 0,
 384         .bmControls = 0,
 385         .bLockDelayUnits = 0,
 386         .wLockDelay = 0,
 387 };
 388
 389 /* STD AS ISO IN Feedback Endpoint */
 390 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
 391         .bLength = USB_DT_ENDPOINT_SIZE,
 392         .bDescriptorType = USB_DT_ENDPOINT,
 393
 394         .bEndpointAddress = USB_DIR_IN,
 395         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 396         .wMaxPacketSize = cpu_to_le16(3),
 397         .bInterval = 1,
 398 };
 399
 400 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
 401         .bLength = USB_DT_ENDPOINT_SIZE,
 402         .bDescriptorType = USB_DT_ENDPOINT,
 403
 404         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 405         .wMaxPacketSize = cpu_to_le16(4),
 406         .bInterval = 4,
 407 };
 408
 409 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
 410         .bLength = USB_DT_ENDPOINT_SIZE,
 411         .bDescriptorType = USB_DT_ENDPOINT,
 412
 413         .bEndpointAddress = USB_DIR_IN,
 414         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 415         .wMaxPacketSize = cpu_to_le16(4),
 416         .bInterval = 4,
 417 };
 418
 419 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
 420         .bLength                = sizeof(ss_epin_fback_desc_comp),
 421         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 422         .bMaxBurst              = 0,
 423         .bmAttributes           = 0,
 424         .wBytesPerInterval      = cpu_to_le16(4),
 425 };
 426
 427
 428 /* Audio Streaming IN Interface - Alt0 */
 429 static struct usb_interface_descriptor std_as_in_if0_desc = {
 430         .bLength = sizeof std_as_in_if0_desc,
 431         .bDescriptorType = USB_DT_INTERFACE,
 432
 433         .bAlternateSetting = 0,
 434         .bNumEndpoints = 0,
 435         .bInterfaceClass = USB_CLASS_AUDIO,
 436         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 437         .bInterfaceProtocol = UAC_VERSION_2,
 438 };
 439
 440 /* Audio Streaming IN Interface - Alt1 */
 441 static struct usb_interface_descriptor std_as_in_if1_desc = {
 442         .bLength = sizeof std_as_in_if1_desc,
 443         .bDescriptorType = USB_DT_INTERFACE,
 444
 445         .bAlternateSetting = 1,
 446         .bNumEndpoints = 1,
 447         .bInterfaceClass = USB_CLASS_AUDIO,
 448         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 449         .bInterfaceProtocol = UAC_VERSION_2,
 450 };
 451
 452 /* Audio Stream IN Intface Desc */
 453 static struct uac2_as_header_descriptor as_in_hdr_desc = {
 454         .bLength = sizeof as_in_hdr_desc,
 455         .bDescriptorType = USB_DT_CS_INTERFACE,
 456
 457         .bDescriptorSubtype = UAC_AS_GENERAL,
 458         /* .bTerminalLink = DYNAMIC */
 459         .bmControls = 0,
 460         .bFormatType = UAC_FORMAT_TYPE_I,
 461         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 462         .iChannelNames = 0,
 463 };
 464
 465 /* Audio USB_IN Format */
 466 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 467         .bLength = sizeof as_in_fmt1_desc,
 468         .bDescriptorType = USB_DT_CS_INTERFACE,
 469         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 470         .bFormatType = UAC_FORMAT_TYPE_I,
 471 };
 472
 473 /* STD AS ISO IN Endpoint */
 474 static struct usb_endpoint_descriptor fs_epin_desc = {
 475         .bLength = USB_DT_ENDPOINT_SIZE,
 476         .bDescriptorType = USB_DT_ENDPOINT,
 477
 478         .bEndpointAddress = USB_DIR_IN,
 479         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 480         /* .wMaxPacketSize = DYNAMIC */
 481         .bInterval = 1,
 482 };
 483
 484 static struct usb_endpoint_descriptor hs_epin_desc = {
 485         .bLength = USB_DT_ENDPOINT_SIZE,
 486         .bDescriptorType = USB_DT_ENDPOINT,
 487
 488         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 489         /* .wMaxPacketSize = DYNAMIC */
 490         /* .bInterval = DYNAMIC */
 491 };
 492
 493 static struct usb_endpoint_descriptor ss_epin_desc = {
 494         .bLength = USB_DT_ENDPOINT_SIZE,
 495         .bDescriptorType = USB_DT_ENDPOINT,
 496
 497         .bEndpointAddress = USB_DIR_IN,
 498         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 499         /* .wMaxPacketSize = DYNAMIC */
 500         /* .bInterval = DYNAMIC */
 501 };
 502
 503 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
 504         .bLength                = sizeof(ss_epin_desc_comp),
 505         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 506         .bMaxBurst              = 0,
 507         .bmAttributes           = 0,
 508         /* wBytesPerInterval = DYNAMIC */
 509 };
 510
 511 /* CS AS ISO IN Endpoint */
 512 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 513         .bLength = sizeof as_iso_in_desc,
 514         .bDescriptorType = USB_DT_CS_ENDPOINT,
 515
 516         .bDescriptorSubtype = UAC_EP_GENERAL,
 517         .bmAttributes = 0,
 518         .bmControls = 0,
 519         .bLockDelayUnits = 0,
 520         .wLockDelay = 0,
 521 };
 522
 523 static struct usb_descriptor_header *fs_audio_desc[] = {
 524         (struct usb_descriptor_header *)&iad_desc,
 525         (struct usb_descriptor_header *)&std_ac_if_desc,
 526
 527         (struct usb_descriptor_header *)&ac_hdr_desc,
 528         (struct usb_descriptor_header *)&in_clk_src_desc,
 529         (struct usb_descriptor_header *)&out_clk_src_desc,
 530         (struct usb_descriptor_header *)&usb_out_it_desc,
 531         (struct usb_descriptor_header *)&out_feature_unit_desc,
 532         (struct usb_descriptor_header *)&io_in_it_desc,
 533         (struct usb_descriptor_header *)&usb_in_ot_desc,
 534         (struct usb_descriptor_header *)&in_feature_unit_desc,
 535         (struct usb_descriptor_header *)&io_out_ot_desc,
 536
 537         (struct usb_descriptor_header *)&fs_ep_int_desc,
 538
 539         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 540         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 541
 542         (struct usb_descriptor_header *)&as_out_hdr_desc,
 543         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 544         (struct usb_descriptor_header *)&fs_epout_desc,
 545         (struct usb_descriptor_header *)&as_iso_out_desc,
 546         (struct usb_descriptor_header *)&fs_epin_fback_desc,
 547
 548         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 549         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 550
 551         (struct usb_descriptor_header *)&as_in_hdr_desc,
 552         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 553         (struct usb_descriptor_header *)&fs_epin_desc,
 554         (struct usb_descriptor_header *)&as_iso_in_desc,
 555         NULL,
 556 };
 557
 558 static struct usb_descriptor_header *hs_audio_desc[] = {
 559         (struct usb_descriptor_header *)&iad_desc,
 560         (struct usb_descriptor_header *)&std_ac_if_desc,
 561
 562         (struct usb_descriptor_header *)&ac_hdr_desc,
 563         (struct usb_descriptor_header *)&in_clk_src_desc,
 564         (struct usb_descriptor_header *)&out_clk_src_desc,
 565         (struct usb_descriptor_header *)&usb_out_it_desc,
 566         (struct usb_descriptor_header *)&out_feature_unit_desc,
 567         (struct usb_descriptor_header *)&io_in_it_desc,
 568         (struct usb_descriptor_header *)&usb_in_ot_desc,
 569         (struct usb_descriptor_header *)&in_feature_unit_desc,
 570         (struct usb_descriptor_header *)&io_out_ot_desc,
 571
 572         (struct usb_descriptor_header *)&hs_ep_int_desc,
 573
 574         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 575         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 576
 577         (struct usb_descriptor_header *)&as_out_hdr_desc,
 578         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 579         (struct usb_descriptor_header *)&hs_epout_desc,
 580         (struct usb_descriptor_header *)&as_iso_out_desc,
 581         (struct usb_descriptor_header *)&hs_epin_fback_desc,
 582
 583         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 584         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 585
 586         (struct usb_descriptor_header *)&as_in_hdr_desc,
 587         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 588         (struct usb_descriptor_header *)&hs_epin_desc,
 589         (struct usb_descriptor_header *)&as_iso_in_desc,
 590         NULL,
 591 };
 592
 593 static struct usb_descriptor_header *ss_audio_desc[] = {
 594         (struct usb_descriptor_header *)&iad_desc,
 595         (struct usb_descriptor_header *)&std_ac_if_desc,
 596
 597         (struct usb_descriptor_header *)&ac_hdr_desc,
 598         (struct usb_descriptor_header *)&in_clk_src_desc,
 599         (struct usb_descriptor_header *)&out_clk_src_desc,
 600         (struct usb_descriptor_header *)&usb_out_it_desc,
 601   (struct usb_descriptor_header *)&out_feature_unit_desc,
 602         (struct usb_descriptor_header *)&io_in_it_desc,
 603         (struct usb_descriptor_header *)&usb_in_ot_desc,
 604         (struct usb_descriptor_header *)&in_feature_unit_desc,
 605         (struct usb_descriptor_header *)&io_out_ot_desc,
 606
 607   (struct usb_descriptor_header *)&ss_ep_int_desc,
 608
 609         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 610         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 611
 612         (struct usb_descriptor_header *)&as_out_hdr_desc,
 613         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 614         (struct usb_descriptor_header *)&ss_epout_desc,
 615         (struct usb_descriptor_header *)&ss_epout_desc_comp,
 616         (struct usb_descriptor_header *)&as_iso_out_desc,
 617         (struct usb_descriptor_header *)&ss_epin_fback_desc,
 618         (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
 619
 620         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 621         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 622
 623         (struct usb_descriptor_header *)&as_in_hdr_desc,
 624         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 625         (struct usb_descriptor_header *)&ss_epin_desc,
 626         (struct usb_descriptor_header *)&ss_epin_desc_comp,
 627         (struct usb_descriptor_header *)&as_iso_in_desc,
 628         NULL,
 629 };
 630
 631 struct cntrl_cur_lay2 {
 632         __le16  wCUR;
 633 };
 634
 635 struct cntrl_range_lay2 {
 636         __le16  wNumSubRanges;
 637         __le16  wMIN;
 638         __le16  wMAX;
 639         __le16  wRES;
 640 } __packed;
 641
 642 struct cntrl_cur_lay3 {
 643         __le32  dCUR;
 644 };
 645
 646 struct cntrl_subrange_lay3 {
 647         __le32  dMIN;
 648         __le32  dMAX;
 649         __le32  dRES;
 650 } __packed;
 651
 652 #define ranges_lay3_size(c) (sizeof(c.wNumSubRanges)    \
 653                 + le16_to_cpu(c.wNumSubRanges)          \
 654                 * sizeof(struct cntrl_subrange_lay3))
 655
 656 #define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n)            \
 657         struct cntrl_ranges_lay3_##k {                  \
 658         __le16  wNumSubRanges;                          \
 659         struct cntrl_subrange_lay3 r[n];                \
 660 } __packed
 661
 662 DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
 663
 664 static int get_max_srate(const int *srates)
 665 {
 666         int i, max_srate = 0;
 667
 668         for (i = 0; i < UAC_MAX_RATES; i++) {
 669                 if (srates[i] == 0)
 670                         break;
 671                 if (srates[i] > max_srate)
 672                         max_srate = srates[i];
 673         }
 674         return max_srate;
 675 }
 676
 677 static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
 678         u8 bint, unsigned int factor, bool is_playback)
 679 {
 680         int chmask, srate, ssize;
 681         u16 max_size_bw;
 682
 683         if (is_playback) {
 684                 chmask = uac2_opts->p_chmask;
 685                 srate = get_max_srate(uac2_opts->p_srates);
 686                 ssize = uac2_opts->p_ssize;
 687         } else {
 688                 chmask = uac2_opts->c_chmask;
 689                 srate = get_max_srate(uac2_opts->c_srates);
 690                 ssize = uac2_opts->c_ssize;
 691         }
 692
 693         if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
 694                 // playback is always async, capture only when configured
 695                 // Win10 requires max packet size + 1 frame
 696                 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
 697                 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
 698                 max_size_bw = num_channels(chmask) * ssize *
 699                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
 700         } else {
 701                 // adding 1 frame provision for Win10
 702                 max_size_bw = num_channels(chmask) * ssize *
 703                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
 704         }
 705         return max_size_bw;
 706 }
 707
 708 static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
 709         struct usb_endpoint_descriptor *ep_desc,
 710         enum usb_device_speed speed, bool is_playback)
 711 {
 712         u16 max_size_bw, max_size_ep;
 713         u8 bint, opts_bint;
 714         char *dir;
 715
 716         switch (speed) {
 717         case USB_SPEED_FULL:
 718                 max_size_ep = 1023;
 719                 // fixed
 720                 bint = ep_desc->bInterval;
 721                 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback);
 722                 break;
 723
 724         case USB_SPEED_HIGH:
 725         case USB_SPEED_SUPER:
 726                 max_size_ep = 1024;
 727                 if (is_playback)
 728                         opts_bint = uac2_opts->p_hs_bint;
 729                 else
 730                         opts_bint = uac2_opts->c_hs_bint;
 731
 732                 if (opts_bint > 0) {
 733                         /* fixed bint */
 734                         bint = opts_bint;
 735                         max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback);
 736                 } else {
 737                         /* checking bInterval from 4 to 1 whether the required bandwidth fits */
 738                         for (bint = 4; bint > 0; --bint) {
 739                                 max_size_bw = get_max_bw_for_bint(
 740                                         uac2_opts, bint, 8000, is_playback);
 741                                 if (max_size_bw <= max_size_ep)
 742                                         break;
 743                         }
 744                 }
 745                 break;
 746
 747         default:
 748                 return -EINVAL;
 749         }
 750
 751         if (is_playback)
 752                 dir = "Playback";
 753         else
 754                 dir = "Capture";
 755
 756         if (max_size_bw <= max_size_ep)
 757                 dev_dbg(dev,
 758                         "%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
 759                         speed_names[speed], dir, max_size_bw, bint);
 760         else {
 761                 dev_warn(dev,
 762                         "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
 763                         speed_names[speed], dir, max_size_bw, bint, max_size_ep);
 764                 max_size_bw = max_size_ep;
 765         }
 766
 767         ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
 768         ep_desc->bInterval = bint;
 769
 770         return 0;
 771 }
 772
 773 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
 774 {
 775         struct uac2_feature_unit_descriptor *fu_desc;
 776         int channels = num_channels(chmask);
 777         int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
 778
 779         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 780         if (!fu_desc)
 781                 return NULL;
 782
 783         fu_desc->bLength = fu_desc_size;
 784         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 785
 786         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 787
 788         /* bUnitID, bSourceID and bmaControls will be defined later */
 789
 790         return fu_desc;
 791 }
 792
 793 /* Use macro to overcome line length limitation */
 794 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
 795
 796 static void setup_headers(struct f_uac2_opts *opts,
 797                           struct usb_descriptor_header **headers,
 798                           enum usb_device_speed speed)
 799 {
 800         struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
 801         struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
 802         struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
 803         struct usb_endpoint_descriptor *epout_desc;
 804         struct usb_endpoint_descriptor *epin_desc;
 805         struct usb_endpoint_descriptor *epin_fback_desc;
 806         struct usb_endpoint_descriptor *ep_int_desc;
 807         int i;
 808
 809         switch (speed) {
 810         case USB_SPEED_FULL:
 811                 epout_desc = &fs_epout_desc;
 812                 epin_desc = &fs_epin_desc;
 813                 epin_fback_desc = &fs_epin_fback_desc;
 814                 ep_int_desc = &fs_ep_int_desc;
 815                 break;
 816         case USB_SPEED_HIGH:
 817                 epout_desc = &hs_epout_desc;
 818                 epin_desc = &hs_epin_desc;
 819                 epin_fback_desc = &hs_epin_fback_desc;
 820                 ep_int_desc = &hs_ep_int_desc;
 821                 break;
 822         default:
 823                 epout_desc = &ss_epout_desc;
 824                 epin_desc = &ss_epin_desc;
 825                 epout_desc_comp = &ss_epout_desc_comp;
 826                 epin_desc_comp = &ss_epin_desc_comp;
 827                 epin_fback_desc = &ss_epin_fback_desc;
 828                 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
 829                 ep_int_desc = &ss_ep_int_desc;
 830         }
 831
 832         i = 0;
 833         headers[i++] = USBDHDR(&iad_desc);
 834         headers[i++] = USBDHDR(&std_ac_if_desc);
 835         headers[i++] = USBDHDR(&ac_hdr_desc);
 836         if (EPIN_EN(opts))
 837                 headers[i++] = USBDHDR(&in_clk_src_desc);
 838         if (EPOUT_EN(opts)) {
 839                 headers[i++] = USBDHDR(&out_clk_src_desc);
 840                 headers[i++] = USBDHDR(&usb_out_it_desc);
 841
 842                 if (FUOUT_EN(opts))
 843                         headers[i++] = USBDHDR(out_feature_unit_desc);
 844         }
 845
 846         if (EPIN_EN(opts)) {
 847                 headers[i++] = USBDHDR(&io_in_it_desc);
 848
 849                 if (FUIN_EN(opts))
 850                         headers[i++] = USBDHDR(in_feature_unit_desc);
 851
 852                 headers[i++] = USBDHDR(&usb_in_ot_desc);
 853         }
 854
 855         if (EPOUT_EN(opts))
 856                 headers[i++] = USBDHDR(&io_out_ot_desc);
 857
 858         if (FUOUT_EN(opts) || FUIN_EN(opts))
 859                 headers[i++] = USBDHDR(ep_int_desc);
 860
 861         if (EPOUT_EN(opts)) {
 862                 headers[i++] = USBDHDR(&std_as_out_if0_desc);
 863                 headers[i++] = USBDHDR(&std_as_out_if1_desc);
 864                 headers[i++] = USBDHDR(&as_out_hdr_desc);
 865                 headers[i++] = USBDHDR(&as_out_fmt1_desc);
 866                 headers[i++] = USBDHDR(epout_desc);
 867                 if (epout_desc_comp)
 868                         headers[i++] = USBDHDR(epout_desc_comp);
 869
 870                 headers[i++] = USBDHDR(&as_iso_out_desc);
 871
 872                 if (EPOUT_FBACK_IN_EN(opts)) {
 873                         headers[i++] = USBDHDR(epin_fback_desc);
 874                         if (epin_fback_desc_comp)
 875                                 headers[i++] = USBDHDR(epin_fback_desc_comp);
 876                 }
 877         }
 878
 879         if (EPIN_EN(opts)) {
 880                 headers[i++] = USBDHDR(&std_as_in_if0_desc);
 881                 headers[i++] = USBDHDR(&std_as_in_if1_desc);
 882                 headers[i++] = USBDHDR(&as_in_hdr_desc);
 883                 headers[i++] = USBDHDR(&as_in_fmt1_desc);
 884                 headers[i++] = USBDHDR(epin_desc);
 885                 if (epin_desc_comp)
 886                         headers[i++] = USBDHDR(epin_desc_comp);
 887
 888                 headers[i++] = USBDHDR(&as_iso_in_desc);
 889         }
 890         headers[i] = NULL;
 891 }
 892
 893 static void setup_descriptor(struct f_uac2_opts *opts)
 894 {
 895         /* patch descriptors */
 896         int i = 1; /* ID's start with 1 */
 897
 898         if (EPOUT_EN(opts))
 899                 usb_out_it_desc.bTerminalID = i++;
 900         if (EPIN_EN(opts))
 901                 io_in_it_desc.bTerminalID = i++;
 902         if (EPOUT_EN(opts))
 903                 io_out_ot_desc.bTerminalID = i++;
 904         if (EPIN_EN(opts))
 905                 usb_in_ot_desc.bTerminalID = i++;
 906         if (FUOUT_EN(opts))
 907                 out_feature_unit_desc->bUnitID = i++;
 908         if (FUIN_EN(opts))
 909                 in_feature_unit_desc->bUnitID = i++;
 910         if (EPOUT_EN(opts))
 911                 out_clk_src_desc.bClockID = i++;
 912         if (EPIN_EN(opts))
 913                 in_clk_src_desc.bClockID = i++;
 914
 915         usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
 916
 917         if (FUIN_EN(opts)) {
 918                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
 919                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
 920         } else {
 921                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
 922         }
 923
 924         usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
 925         io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
 926         io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
 927
 928         if (FUOUT_EN(opts)) {
 929                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
 930                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
 931         } else {
 932                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
 933         }
 934
 935         as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
 936         as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 937
 938         iad_desc.bInterfaceCount = 1;
 939         ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 940
 941         if (EPIN_EN(opts)) {
 942                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 943
 944                 len += sizeof(in_clk_src_desc);
 945                 len += sizeof(usb_in_ot_desc);
 946
 947                 if (FUIN_EN(opts))
 948                         len += in_feature_unit_desc->bLength;
 949
 950                 len += sizeof(io_in_it_desc);
 951                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 952                 iad_desc.bInterfaceCount++;
 953         }
 954         if (EPOUT_EN(opts)) {
 955                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 956
 957                 len += sizeof(out_clk_src_desc);
 958                 len += sizeof(usb_out_it_desc);
 959
 960                 if (FUOUT_EN(opts))
 961                         len += out_feature_unit_desc->bLength;
 962
 963                 len += sizeof(io_out_ot_desc);
 964                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 965                 iad_desc.bInterfaceCount++;
 966         }
 967
 968         setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
 969         setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
 970         setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
 971 }
 972
 973 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
 974 {
 975         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
 976         const char *msg = NULL;
 977
 978         if (!opts->p_chmask && !opts->c_chmask)
 979                 msg = "no playback and capture channels";
 980         else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
 981                 msg = "unsupported playback channels mask";
 982         else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
 983                 msg = "unsupported capture channels mask";
 984         else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
 985                 msg = "incorrect playback sample size";
 986         else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
 987                 msg = "incorrect capture sample size";
 988         else if (!opts->p_srates[0])
 989                 msg = "incorrect playback sampling rate";
 990         else if (!opts->c_srates[0])
 991                 msg = "incorrect capture sampling rate";
 992
 993         else if (opts->p_volume_max <= opts->p_volume_min)
 994                 msg = "incorrect playback volume max/min";
 995         else if (opts->c_volume_max <= opts->c_volume_min)
 996                 msg = "incorrect capture volume max/min";
 997         else if (opts->p_volume_res <= 0)
 998                 msg = "negative/zero playback volume resolution";
 999         else if (opts->c_volume_res <= 0)
1000                 msg = "negative/zero capture volume resolution";
1001
1002         else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
1003                 msg = "incorrect playback volume resolution";
1004         else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
1005                 msg = "incorrect capture volume resolution";
1006
1007         else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
1008                 msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
1009         else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
1010                 msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
1011
1012         if (msg) {
1013                 dev_err(dev, "Error: %s\n", msg);
1014                 return -EINVAL;
1015         }
1016
1017         return 0;
1018 }
1019
1020 static int
1021 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
1022 {
1023         struct f_uac2 *uac2 = func_to_uac2(fn);
1024         struct g_audio *agdev = func_to_g_audio(fn);
1025         struct usb_composite_dev *cdev = cfg->cdev;
1026         struct usb_gadget *gadget = cdev->gadget;
1027         struct device *dev = &gadget->dev;
1028         struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
1029         struct usb_string *us;
1030         int ret;
1031
1032         ret = afunc_validate_opts(agdev, dev);
1033         if (ret)
1034                 return ret;
1035
1036         strings_fn[STR_ASSOC].s = uac2_opts->function_name;
1037
1038         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
1039         if (IS_ERR(us))
1040                 return PTR_ERR(us);
1041
1042         if (FUOUT_EN(uac2_opts)) {
1043                 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
1044                 if (!out_feature_unit_desc)
1045                         return -ENOMEM;
1046         }
1047         if (FUIN_EN(uac2_opts)) {
1048                 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
1049                 if (!in_feature_unit_desc) {
1050                         ret = -ENOMEM;
1051                         goto err_free_fu;
1052                 }
1053         }
1054
1055         iad_desc.iFunction = us[STR_ASSOC].id;
1056         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1057         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1058         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1059         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1060         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1061         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1062         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1063         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1064         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1065         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1066         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1067
1068         if (FUOUT_EN(uac2_opts)) {
1069                 u8 *i_feature = (u8 *)out_feature_unit_desc +
1070                                 out_feature_unit_desc->bLength - 1;
1071                 *i_feature = us[STR_FU_OUT].id;
1072         }
1073         if (FUIN_EN(uac2_opts)) {
1074                 u8 *i_feature = (u8 *)in_feature_unit_desc +
1075                                 in_feature_unit_desc->bLength - 1;
1076                 *i_feature = us[STR_FU_IN].id;
1077         }
1078
1079
1080         /* Initialize the configurable parameters */
1081         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1082         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1083         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1084         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1085         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1086         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1087         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1088         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1089         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1090         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1091         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1092         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1093         if (FUOUT_EN(uac2_opts)) {
1094                 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1095                 u32 control = 0;
1096
1097                 if (uac2_opts->c_mute_present)
1098                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1099                 if (uac2_opts->c_volume_present)
1100                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1101                 *bma = cpu_to_le32(control);
1102         }
1103         if (FUIN_EN(uac2_opts)) {
1104                 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1105                 u32 control = 0;
1106
1107                 if (uac2_opts->p_mute_present)
1108                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1109                 if (uac2_opts->p_volume_present)
1110                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1111                 *bma = cpu_to_le32(control);
1112         }
1113
1114         ret = usb_interface_id(cfg, fn);
1115         if (ret < 0) {
1116                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1117                 goto err_free_fu;
1118         }
1119         iad_desc.bFirstInterface = ret;
1120
1121         std_ac_if_desc.bInterfaceNumber = ret;
1122         uac2->ac_intf = ret;
1123         uac2->ac_alt = 0;
1124
1125         if (EPOUT_EN(uac2_opts)) {
1126                 ret = usb_interface_id(cfg, fn);
1127                 if (ret < 0) {
1128                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1129                         goto err_free_fu;
1130                 }
1131                 std_as_out_if0_desc.bInterfaceNumber = ret;
1132                 std_as_out_if1_desc.bInterfaceNumber = ret;
1133                 uac2->as_out_intf = ret;
1134                 uac2->as_out_alt = 0;
1135
1136                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1137                         fs_epout_desc.bmAttributes =
1138                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1139                         hs_epout_desc.bmAttributes =
1140                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1141                         ss_epout_desc.bmAttributes =
1142                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1143                         std_as_out_if1_desc.bNumEndpoints++;
1144                 } else {
1145                         fs_epout_desc.bmAttributes =
1146                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1147                         hs_epout_desc.bmAttributes =
1148                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1149                         ss_epout_desc.bmAttributes =
1150                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1151                 }
1152         }
1153
1154         if (EPIN_EN(uac2_opts)) {
1155                 ret = usb_interface_id(cfg, fn);
1156                 if (ret < 0) {
1157                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1158                         goto err_free_fu;
1159                 }
1160                 std_as_in_if0_desc.bInterfaceNumber = ret;
1161                 std_as_in_if1_desc.bInterfaceNumber = ret;
1162                 uac2->as_in_intf = ret;
1163                 uac2->as_in_alt = 0;
1164         }
1165
1166         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1167                 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1168                 if (!uac2->int_ep) {
1169                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1170                         ret = -ENODEV;
1171                         goto err_free_fu;
1172                 }
1173
1174                 std_ac_if_desc.bNumEndpoints = 1;
1175         }
1176
1177         hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
1178         ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
1179         hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
1180         ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
1181
1182         /* Calculate wMaxPacketSize according to audio bandwidth */
1183         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc,
1184                                         USB_SPEED_FULL, true);
1185         if (ret < 0) {
1186                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1187                 return ret;
1188         }
1189
1190         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc,
1191                                         USB_SPEED_FULL, false);
1192         if (ret < 0) {
1193                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1194                 return ret;
1195         }
1196
1197         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc,
1198                                         USB_SPEED_HIGH, true);
1199         if (ret < 0) {
1200                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1201                 return ret;
1202         }
1203
1204         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc,
1205                                         USB_SPEED_HIGH, false);
1206         if (ret < 0) {
1207                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1208                 return ret;
1209         }
1210
1211         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc,
1212                                         USB_SPEED_SUPER, true);
1213         if (ret < 0) {
1214                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1215                 return ret;
1216         }
1217
1218         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc,
1219                                         USB_SPEED_SUPER, false);
1220         if (ret < 0) {
1221                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1222                 return ret;
1223         }
1224
1225         if (EPOUT_EN(uac2_opts)) {
1226                 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1227                 if (!agdev->out_ep) {
1228                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1229                         ret = -ENODEV;
1230                         goto err_free_fu;
1231                 }
1232                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1233                         agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1234                                                        &fs_epin_fback_desc);
1235                         if (!agdev->in_ep_fback) {
1236                                 dev_err(dev, "%s:%d Error!\n",
1237                                         __func__, __LINE__);
1238                                 ret = -ENODEV;
1239                                 goto err_free_fu;
1240                         }
1241                 }
1242         }
1243
1244         if (EPIN_EN(uac2_opts)) {
1245                 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1246                 if (!agdev->in_ep) {
1247                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1248                         ret = -ENODEV;
1249                         goto err_free_fu;
1250                 }
1251         }
1252
1253         agdev->in_ep_maxpsize = max_t(u16,
1254                                 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1255                                 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1256         agdev->out_ep_maxpsize = max_t(u16,
1257                                 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1258                                 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1259
1260         agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1261                                 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1262         agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1263                                 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1264
1265         ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1266         ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1267
1268         // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1269         hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1270         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1271         hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1272         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1273         ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1274         ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1275         ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1276         ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1277
1278         setup_descriptor(uac2_opts);
1279
1280         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1281                                      ss_audio_desc);
1282         if (ret)
1283                 goto err_free_fu;
1284
1285         agdev->gadget = gadget;
1286
1287         agdev->params.p_chmask = uac2_opts->p_chmask;
1288         memcpy(agdev->params.p_srates, uac2_opts->p_srates,
1289                         sizeof(agdev->params.p_srates));
1290         agdev->params.p_ssize = uac2_opts->p_ssize;
1291         if (FUIN_EN(uac2_opts)) {
1292                 agdev->params.p_fu.id = USB_IN_FU_ID;
1293                 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1294                 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1295                 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1296                 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1297                 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1298         }
1299         agdev->params.c_chmask = uac2_opts->c_chmask;
1300         memcpy(agdev->params.c_srates, uac2_opts->c_srates,
1301                         sizeof(agdev->params.c_srates));
1302         agdev->params.c_ssize = uac2_opts->c_ssize;
1303         if (FUOUT_EN(uac2_opts)) {
1304                 agdev->params.c_fu.id = USB_OUT_FU_ID;
1305                 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1306                 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1307                 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1308                 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1309                 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1310         }
1311         agdev->params.req_number = uac2_opts->req_number;
1312         agdev->params.fb_max = uac2_opts->fb_max;
1313
1314         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1315     agdev->notify = afunc_notify;
1316
1317         ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1318         if (ret)
1319                 goto err_free_descs;
1320
1321         return 0;
1322
1323 err_free_descs:
1324         usb_free_all_descriptors(fn);
1325         agdev->gadget = NULL;
1326 err_free_fu:
1327         kfree(out_feature_unit_desc);
1328         out_feature_unit_desc = NULL;
1329         kfree(in_feature_unit_desc);
1330         in_feature_unit_desc = NULL;
1331         return ret;
1332 }
1333
1334 static void
1335 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1336 {
1337         struct g_audio *agdev = req->context;
1338         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1339
1340         atomic_dec(&uac2->int_count);
1341         kfree(req->buf);
1342         usb_ep_free_request(_ep, req);
1343 }
1344
1345 static int
1346 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1347 {
1348         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1349         struct usb_request *req;
1350         struct uac2_interrupt_data_msg *msg;
1351         u16 w_index, w_value;
1352         int ret;
1353
1354         if (!uac2->int_ep->enabled)
1355                 return 0;
1356
1357         if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1358                 atomic_dec(&uac2->int_count);
1359                 return 0;
1360         }
1361
1362         req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1363         if (req == NULL) {
1364                 ret = -ENOMEM;
1365                 goto err_dec_int_count;
1366         }
1367
1368         msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1369         if (msg == NULL) {
1370                 ret = -ENOMEM;
1371                 goto err_free_request;
1372         }
1373
1374         w_index = unit_id << 8 | uac2->ac_intf;
1375         w_value = cs << 8;
1376
1377         msg->bInfo = 0; /* Non-vendor, interface interrupt */
1378         msg->bAttribute = UAC2_CS_CUR;
1379         msg->wIndex = cpu_to_le16(w_index);
1380         msg->wValue = cpu_to_le16(w_value);
1381
1382         req->length = sizeof(*msg);
1383         req->buf = msg;
1384         req->context = agdev;
1385         req->complete = afunc_notify_complete;
1386
1387         ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1388
1389         if (ret)
1390                 goto err_free_msg;
1391
1392         return 0;
1393
1394 err_free_msg:
1395         kfree(msg);
1396 err_free_request:
1397         usb_ep_free_request(uac2->int_ep, req);
1398 err_dec_int_count:
1399         atomic_dec(&uac2->int_count);
1400
1401         return ret;
1402 }
1403
1404 static int
1405 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1406 {
1407         struct usb_composite_dev *cdev = fn->config->cdev;
1408         struct f_uac2 *uac2 = func_to_uac2(fn);
1409         struct g_audio *agdev = func_to_g_audio(fn);
1410         struct usb_gadget *gadget = cdev->gadget;
1411         struct device *dev = &gadget->dev;
1412         int ret = 0;
1413
1414         /* No i/f has more than 2 alt settings */
1415         if (alt > 1) {
1416                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1417                 return -EINVAL;
1418         }
1419
1420         if (intf == uac2->ac_intf) {
1421                 /* Control I/f has only 1 AltSetting - 0 */
1422                 if (alt) {
1423                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1424                         return -EINVAL;
1425                 }
1426
1427                 /* restart interrupt endpoint */
1428                 if (uac2->int_ep) {
1429                         usb_ep_disable(uac2->int_ep);
1430                         config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1431                         usb_ep_enable(uac2->int_ep);
1432                 }
1433
1434                 return 0;
1435         }
1436
1437         if (intf == uac2->as_out_intf) {
1438                 uac2->as_out_alt = alt;
1439
1440                 if (alt)
1441                         ret = u_audio_start_capture(&uac2->g_audio);
1442                 else
1443                         u_audio_stop_capture(&uac2->g_audio);
1444         } else if (intf == uac2->as_in_intf) {
1445                 uac2->as_in_alt = alt;
1446
1447                 if (alt)
1448                         ret = u_audio_start_playback(&uac2->g_audio);
1449                 else
1450                         u_audio_stop_playback(&uac2->g_audio);
1451         } else {
1452                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1453                 return -EINVAL;
1454         }
1455
1456         return ret;
1457 }
1458
1459 static int
1460 afunc_get_alt(struct usb_function *fn, unsigned intf)
1461 {
1462         struct f_uac2 *uac2 = func_to_uac2(fn);
1463         struct g_audio *agdev = func_to_g_audio(fn);
1464
1465         if (intf == uac2->ac_intf)
1466                 return uac2->ac_alt;
1467         else if (intf == uac2->as_out_intf)
1468                 return uac2->as_out_alt;
1469         else if (intf == uac2->as_in_intf)
1470                 return uac2->as_in_alt;
1471         else
1472                 dev_err(&agdev->gadget->dev,
1473                         "%s:%d Invalid Interface %d!\n",
1474                         __func__, __LINE__, intf);
1475
1476         return -EINVAL;
1477 }
1478
1479 static void
1480 afunc_disable(struct usb_function *fn)
1481 {
1482         struct f_uac2 *uac2 = func_to_uac2(fn);
1483
1484         uac2->as_in_alt = 0;
1485         uac2->as_out_alt = 0;
1486         u_audio_stop_capture(&uac2->g_audio);
1487         u_audio_stop_playback(&uac2->g_audio);
1488         if (uac2->int_ep)
1489                 usb_ep_disable(uac2->int_ep);
1490 }
1491
1492 static void
1493 afunc_suspend(struct usb_function *fn)
1494 {
1495         struct f_uac2 *uac2 = func_to_uac2(fn);
1496
1497         u_audio_suspend(&uac2->g_audio);
1498 }
1499
1500 static int
1501 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1502 {
1503         struct usb_request *req = fn->config->cdev->req;
1504         struct g_audio *agdev = func_to_g_audio(fn);
1505         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1506         u16 w_length = le16_to_cpu(cr->wLength);
1507         u16 w_index = le16_to_cpu(cr->wIndex);
1508         u16 w_value = le16_to_cpu(cr->wValue);
1509         u8 entity_id = (w_index >> 8) & 0xff;
1510         u8 control_selector = w_value >> 8;
1511         int value = -EOPNOTSUPP;
1512         u32 p_srate, c_srate;
1513
1514         u_audio_get_playback_srate(agdev, &p_srate);
1515         u_audio_get_capture_srate(agdev, &c_srate);
1516
1517         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1518                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1519                         struct cntrl_cur_lay3 c;
1520
1521                         memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1522
1523                         if (entity_id == USB_IN_CLK_ID)
1524                                 c.dCUR = cpu_to_le32(p_srate);
1525                         else if (entity_id == USB_OUT_CLK_ID)
1526                                 c.dCUR = cpu_to_le32(c_srate);
1527
1528                         value = min_t(unsigned int, w_length, sizeof(c));
1529                         memcpy(req->buf, &c, value);
1530                 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1531                         *(u8 *)req->buf = 1;
1532                         value = min_t(unsigned int, w_length, 1);
1533                 } else {
1534                         dev_err(&agdev->gadget->dev,
1535                                 "%s:%d control_selector=%d TODO!\n",
1536                                 __func__, __LINE__, control_selector);
1537                 }
1538         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1539                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1540                 unsigned int is_playback = 0;
1541
1542                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1543                         is_playback = 1;
1544
1545                 if (control_selector == UAC_FU_MUTE) {
1546                         unsigned int mute;
1547
1548                         u_audio_get_mute(agdev, is_playback, &mute);
1549
1550                         *(u8 *)req->buf = mute;
1551                         value = min_t(unsigned int, w_length, 1);
1552                 } else if (control_selector == UAC_FU_VOLUME) {
1553                         struct cntrl_cur_lay2 c;
1554                         s16 volume;
1555
1556                         memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1557
1558                         u_audio_get_volume(agdev, is_playback, &volume);
1559                         c.wCUR = cpu_to_le16(volume);
1560
1561                         value = min_t(unsigned int, w_length, sizeof(c));
1562                         memcpy(req->buf, &c, value);
1563                 } else {
1564                         dev_err(&agdev->gadget->dev,
1565                                 "%s:%d control_selector=%d TODO!\n",
1566                                 __func__, __LINE__, control_selector);
1567                 }
1568         } else {
1569                 dev_err(&agdev->gadget->dev,
1570                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1571                         __func__, __LINE__, entity_id, control_selector);
1572         }
1573
1574         return value;
1575 }
1576
1577 static int
1578 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1579 {
1580         struct usb_request *req = fn->config->cdev->req;
1581         struct g_audio *agdev = func_to_g_audio(fn);
1582         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1583         u16 w_length = le16_to_cpu(cr->wLength);
1584         u16 w_index = le16_to_cpu(cr->wIndex);
1585         u16 w_value = le16_to_cpu(cr->wValue);
1586         u8 entity_id = (w_index >> 8) & 0xff;
1587         u8 control_selector = w_value >> 8;
1588         int value = -EOPNOTSUPP;
1589
1590         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1591                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1592                         struct cntrl_ranges_lay3_srates rs;
1593                         int i;
1594                         int wNumSubRanges = 0;
1595                         int srate;
1596                         int *srates;
1597
1598                         if (entity_id == USB_IN_CLK_ID)
1599                                 srates = opts->p_srates;
1600                         else if (entity_id == USB_OUT_CLK_ID)
1601                                 srates = opts->c_srates;
1602                         else
1603                                 return -EOPNOTSUPP;
1604                         for (i = 0; i < UAC_MAX_RATES; i++) {
1605                                 srate = srates[i];
1606                                 if (srate == 0)
1607                                         break;
1608
1609                                 rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
1610                                 rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
1611                                 rs.r[wNumSubRanges].dRES = 0;
1612                                 wNumSubRanges++;
1613                                 dev_dbg(&agdev->gadget->dev,
1614                                         "%s(): clk %d: rate ID %d: %d\n",
1615                                         __func__, entity_id, wNumSubRanges, srate);
1616                         }
1617                         rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
1618                         value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
1619                         dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
1620                                 __func__, rs.wNumSubRanges, value);
1621                         memcpy(req->buf, &rs, value);
1622                 } else {
1623                         dev_err(&agdev->gadget->dev,
1624                                 "%s:%d control_selector=%d TODO!\n",
1625                                 __func__, __LINE__, control_selector);
1626                 }
1627         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1628                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1629                 unsigned int is_playback = 0;
1630
1631                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1632                         is_playback = 1;
1633
1634                 if (control_selector == UAC_FU_VOLUME) {
1635                         struct cntrl_range_lay2 r;
1636                         s16 max_db, min_db, res_db;
1637
1638                         if (is_playback) {
1639                                 max_db = opts->p_volume_max;
1640                                 min_db = opts->p_volume_min;
1641                                 res_db = opts->p_volume_res;
1642                         } else {
1643                                 max_db = opts->c_volume_max;
1644                                 min_db = opts->c_volume_min;
1645                                 res_db = opts->c_volume_res;
1646                         }
1647
1648                         r.wMAX = cpu_to_le16(max_db);
1649                         r.wMIN = cpu_to_le16(min_db);
1650                         r.wRES = cpu_to_le16(res_db);
1651                         r.wNumSubRanges = cpu_to_le16(1);
1652
1653                         value = min_t(unsigned int, w_length, sizeof(r));
1654                         memcpy(req->buf, &r, value);
1655                 } else {
1656                         dev_err(&agdev->gadget->dev,
1657                                 "%s:%d control_selector=%d TODO!\n",
1658                                 __func__, __LINE__, control_selector);
1659                 }
1660         } else {
1661                 dev_err(&agdev->gadget->dev,
1662                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1663                         __func__, __LINE__, entity_id, control_selector);
1664         }
1665
1666         return value;
1667 }
1668
1669 static int
1670 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1671 {
1672         if (cr->bRequest == UAC2_CS_CUR)
1673                 return in_rq_cur(fn, cr);
1674         else if (cr->bRequest == UAC2_CS_RANGE)
1675                 return in_rq_range(fn, cr);
1676         else
1677                 return -EOPNOTSUPP;
1678 }
1679
1680 static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
1681 {
1682         struct usb_function *fn = ep->driver_data;
1683         struct g_audio *agdev = func_to_g_audio(fn);
1684         struct f_uac2 *uac2 = func_to_uac2(fn);
1685         u32 val;
1686
1687         if (req->actual != 4)
1688                 return;
1689
1690         val = le32_to_cpu(*((__le32 *)req->buf));
1691         dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
1692         if (uac2->clock_id == USB_IN_CLK_ID) {
1693                 u_audio_set_playback_srate(agdev, val);
1694         } else if (uac2->clock_id == USB_OUT_CLK_ID) {
1695                 u_audio_set_capture_srate(agdev, val);
1696         }
1697 }
1698
1699 static void
1700 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1701 {
1702         struct g_audio *agdev = req->context;
1703         struct usb_composite_dev *cdev = agdev->func.config->cdev;
1704         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1705         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1706         struct usb_ctrlrequest *cr = &uac2->setup_cr;
1707         u16 w_index = le16_to_cpu(cr->wIndex);
1708         u16 w_value = le16_to_cpu(cr->wValue);
1709         u8 entity_id = (w_index >> 8) & 0xff;
1710         u8 control_selector = w_value >> 8;
1711
1712         if (req->status != 0) {
1713                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1714                 return;
1715         }
1716
1717         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1718                 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1719                 unsigned int is_playback = 0;
1720
1721                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1722                         is_playback = 1;
1723
1724                 if (control_selector == UAC_FU_MUTE) {
1725                         u8 mute = *(u8 *)req->buf;
1726
1727                         u_audio_set_mute(agdev, is_playback, mute);
1728
1729                         return;
1730                 } else if (control_selector == UAC_FU_VOLUME) {
1731                         struct cntrl_cur_lay2 *c = req->buf;
1732                         s16 volume;
1733
1734                         volume = le16_to_cpu(c->wCUR);
1735                         u_audio_set_volume(agdev, is_playback, volume);
1736
1737                         return;
1738                 } else {
1739                         dev_err(&agdev->gadget->dev,
1740                                 "%s:%d control_selector=%d TODO!\n",
1741                                 __func__, __LINE__, control_selector);
1742                         usb_ep_set_halt(ep);
1743                 }
1744         }
1745 }
1746
1747 static int
1748 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1749 {
1750         struct usb_composite_dev *cdev = fn->config->cdev;
1751         struct usb_request *req = fn->config->cdev->req;
1752         struct g_audio *agdev = func_to_g_audio(fn);
1753         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1754         struct f_uac2 *uac2 = func_to_uac2(fn);
1755         u16 w_length = le16_to_cpu(cr->wLength);
1756         u16 w_index = le16_to_cpu(cr->wIndex);
1757         u16 w_value = le16_to_cpu(cr->wValue);
1758         u8 entity_id = (w_index >> 8) & 0xff;
1759         u8 control_selector = w_value >> 8;
1760         u8 clock_id = w_index >> 8;
1761
1762         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1763                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1764                         dev_dbg(&agdev->gadget->dev,
1765                                 "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
1766                         cdev->gadget->ep0->driver_data = fn;
1767                         uac2->clock_id = clock_id;
1768                         req->complete = uac2_cs_control_sam_freq;
1769                         return w_length;
1770                 }
1771         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1772                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1773                 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1774                 req->context = agdev;
1775                 req->complete = out_rq_cur_complete;
1776
1777                 return w_length;
1778         } else {
1779                 dev_err(&agdev->gadget->dev,
1780                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1781                         __func__, __LINE__, entity_id, control_selector);
1782         }
1783         return -EOPNOTSUPP;
1784 }
1785
1786 static int
1787 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1788 {
1789         struct f_uac2 *uac2 = func_to_uac2(fn);
1790         struct g_audio *agdev = func_to_g_audio(fn);
1791         u16 w_index = le16_to_cpu(cr->wIndex);
1792         u8 intf = w_index & 0xff;
1793
1794         if (intf != uac2->ac_intf) {
1795                 dev_err(&agdev->gadget->dev,
1796                         "%s:%d Error!\n", __func__, __LINE__);
1797                 return -EOPNOTSUPP;
1798         }
1799
1800         if (cr->bRequestType & USB_DIR_IN)
1801                 return ac_rq_in(fn, cr);
1802         else if (cr->bRequest == UAC2_CS_CUR)
1803                 return out_rq_cur(fn, cr);
1804
1805         return -EOPNOTSUPP;
1806 }
1807
1808 static int
1809 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1810 {
1811         struct usb_composite_dev *cdev = fn->config->cdev;
1812         struct g_audio *agdev = func_to_g_audio(fn);
1813         struct usb_request *req = cdev->req;
1814         u16 w_length = le16_to_cpu(cr->wLength);
1815         int value = -EOPNOTSUPP;
1816
1817         /* Only Class specific requests are supposed to reach here */
1818         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1819                 return -EOPNOTSUPP;
1820
1821         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1822                 value = setup_rq_inf(fn, cr);
1823         else
1824                 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1825                                 __func__, __LINE__);
1826
1827         if (value >= 0) {
1828                 req->length = value;
1829                 req->zero = value < w_length;
1830                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1831                 if (value < 0) {
1832                         dev_err(&agdev->gadget->dev,
1833                                 "%s:%d Error!\n", __func__, __LINE__);
1834                         req->status = 0;
1835                 }
1836         }
1837
1838         return value;
1839 }
1840
1841 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1842 {
1843         return container_of(to_config_group(item), struct f_uac2_opts,
1844                             func_inst.group);
1845 }
1846
1847 static void f_uac2_attr_release(struct config_item *item)
1848 {
1849         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1850
1851         usb_put_function_instance(&opts->func_inst);
1852 }
1853
1854 static struct configfs_item_operations f_uac2_item_ops = {
1855         .release        = f_uac2_attr_release,
1856 };
1857
1858 #define uac2_kstrtou8 kstrtou8
1859 #define uac2_kstrtou32 kstrtou32
1860 #define uac2_kstrtos16 kstrtos16
1861 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1862
1863 static const char *u8_fmt = "%u\n";
1864 static const char *u32_fmt = "%u\n";
1865 static const char *s16_fmt = "%hd\n";
1866 static const char *bool_fmt = "%u\n";
1867
1868 #define UAC2_ATTRIBUTE(type, name)                                      \
1869 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1870                                          char *page)                    \
1871 {                                                                       \
1872         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1873         int result;                                                     \
1874                                                                         \
1875         mutex_lock(&opts->lock);                                        \
1876         result = sprintf(page, type##_fmt, opts->name);                 \
1877         mutex_unlock(&opts->lock);                                      \
1878                                                                         \
1879         return result;                                                  \
1880 }                                                                       \
1881                                                                         \
1882 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1883                                           const char *page, size_t len) \
1884 {                                                                       \
1885         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1886         int ret;                                                        \
1887         type num;                                                       \
1888                                                                         \
1889         mutex_lock(&opts->lock);                                        \
1890         if (opts->refcnt) {                                             \
1891                 ret = -EBUSY;                                           \
1892                 goto end;                                               \
1893         }                                                               \
1894                                                                         \
1895         ret = uac2_kstrto##type(page, 0, &num);                         \
1896         if (ret)                                                        \
1897                 goto end;                                               \
1898                                                                         \
1899         opts->name = num;                                               \
1900         ret = len;                                                      \
1901                                                                         \
1902 end:                                                                    \
1903         mutex_unlock(&opts->lock);                                      \
1904         return ret;                                                     \
1905 }                                                                       \
1906                                                                         \
1907 CONFIGFS_ATTR(f_uac2_opts_, name)
1908
1909 #define UAC2_ATTRIBUTE_SYNC(name)                                       \
1910 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1911                                          char *page)                    \
1912 {                                                                       \
1913         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1914         int result;                                                     \
1915         char *str;                                                      \
1916                                                                         \
1917         mutex_lock(&opts->lock);                                        \
1918         switch (opts->name) {                                           \
1919         case USB_ENDPOINT_SYNC_ASYNC:                                   \
1920                 str = "async";                                          \
1921                 break;                                                  \
1922         case USB_ENDPOINT_SYNC_ADAPTIVE:                                \
1923                 str = "adaptive";                                       \
1924                 break;                                                  \
1925         default:                                                        \
1926                 str = "unknown";                                        \
1927                 break;                                                  \
1928         }                                                               \
1929         result = sprintf(page, "%s\n", str);                            \
1930         mutex_unlock(&opts->lock);                                      \
1931                                                                         \
1932         return result;                                                  \
1933 }                                                                       \
1934                                                                         \
1935 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1936                                           const char *page, size_t len) \
1937 {                                                                       \
1938         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1939         int ret = 0;                                                    \
1940                                                                         \
1941         mutex_lock(&opts->lock);                                        \
1942         if (opts->refcnt) {                                             \
1943                 ret = -EBUSY;                                           \
1944                 goto end;                                               \
1945         }                                                               \
1946                                                                         \
1947         if (!strncmp(page, "async", 5))                                 \
1948                 opts->name = USB_ENDPOINT_SYNC_ASYNC;                   \
1949         else if (!strncmp(page, "adaptive", 8))                         \
1950                 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE;                \
1951         else {                                                          \
1952                 ret = -EINVAL;                                          \
1953                 goto end;                                               \
1954         }                                                               \
1955                                                                         \
1956         ret = len;                                                      \
1957                                                                         \
1958 end:                                                                    \
1959         mutex_unlock(&opts->lock);                                      \
1960         return ret;                                                     \
1961 }                                                                       \
1962                                                                         \
1963 CONFIGFS_ATTR(f_uac2_opts_, name)
1964
1965 #define UAC2_RATE_ATTRIBUTE(name)                                       \
1966 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1967                                          char *page)                    \
1968 {                                                                       \
1969         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1970         int result = 0;                                                 \
1971         int i;                                                          \
1972                                                                         \
1973         mutex_lock(&opts->lock);                                        \
1974         page[0] = '\0';                                                 \
1975         for (i = 0; i < UAC_MAX_RATES; i++) {                           \
1976                 if (opts->name##s[i] == 0)                              \
1977                         break;                                          \
1978                 result += sprintf(page + strlen(page), "%u,",           \
1979                                 opts->name##s[i]);                      \
1980         }                                                               \
1981         if (strlen(page) > 0)                                           \
1982                 page[strlen(page) - 1] = '\n';                          \
1983         mutex_unlock(&opts->lock);                                      \
1984                                                                         \
1985         return result;                                                  \
1986 }                                                                       \
1987                                                                         \
1988 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1989                                           const char *page, size_t len) \
1990 {                                                                       \
1991         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1992         char *split_page = NULL;                                        \
1993         int ret = -EINVAL;                                              \
1994         char *token;                                                    \
1995         u32 num;                                                        \
1996         int i;                                                          \
1997                                                                         \
1998         mutex_lock(&opts->lock);                                        \
1999         if (opts->refcnt) {                                             \
2000                 ret = -EBUSY;                                           \
2001                 goto end;                                               \
2002         }                                                               \
2003                                                                         \
2004         i = 0;                                                          \
2005         memset(opts->name##s, 0x00, sizeof(opts->name##s));             \
2006         split_page = kstrdup(page, GFP_KERNEL);                         \
2007         while ((token = strsep(&split_page, ",")) != NULL) {            \
2008                 ret = kstrtou32(token, 0, &num);                        \
2009                 if (ret)                                                \
2010                         goto end;                                       \
2011                                                                         \
2012                 opts->name##s[i++] = num;                               \
2013                 ret = len;                                              \
2014         };                                                              \
2015                                                                         \
2016 end:                                                                    \
2017         kfree(split_page);                                              \
2018         mutex_unlock(&opts->lock);                                      \
2019         return ret;                                                     \
2020 }                                                                       \
2021                                                                         \
2022 CONFIGFS_ATTR(f_uac2_opts_, name)
2023
2024 #define UAC2_ATTRIBUTE_STRING(name)                                     \
2025 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
2026                                          char *page)                    \
2027 {                                                                       \
2028         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2029         int result;                                                     \
2030                                                                         \
2031         mutex_lock(&opts->lock);                                        \
2032         result = snprintf(page, sizeof(opts->name), "%s", opts->name);  \
2033         mutex_unlock(&opts->lock);                                      \
2034                                                                         \
2035         return result;                                                  \
2036 }                                                                       \
2037                                                                         \
2038 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
2039                                           const char *page, size_t len) \
2040 {                                                                       \
2041         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2042         int ret = 0;                                                    \
2043                                                                         \
2044         mutex_lock(&opts->lock);                                        \
2045         if (opts->refcnt) {                                             \
2046                 ret = -EBUSY;                                           \
2047                 goto end;                                               \
2048         }                                                               \
2049                                                                         \
2050         ret = snprintf(opts->name, min(sizeof(opts->name), len),        \
2051                         "%s", page);                                    \
2052                                                                         \
2053 end:                                                                    \
2054         mutex_unlock(&opts->lock);                                      \
2055         return ret;                                                     \
2056 }                                                                       \
2057                                                                         \
2058 CONFIGFS_ATTR(f_uac2_opts_, name)
2059
2060 UAC2_ATTRIBUTE(u32, p_chmask);
2061 UAC2_RATE_ATTRIBUTE(p_srate);
2062 UAC2_ATTRIBUTE(u32, p_ssize);
2063 UAC2_ATTRIBUTE(u8, p_hs_bint);
2064 UAC2_ATTRIBUTE(u32, c_chmask);
2065 UAC2_RATE_ATTRIBUTE(c_srate);
2066 UAC2_ATTRIBUTE_SYNC(c_sync);
2067 UAC2_ATTRIBUTE(u32, c_ssize);
2068 UAC2_ATTRIBUTE(u8, c_hs_bint);
2069 UAC2_ATTRIBUTE(u32, req_number);
2070
2071 UAC2_ATTRIBUTE(bool, p_mute_present);
2072 UAC2_ATTRIBUTE(bool, p_volume_present);
2073 UAC2_ATTRIBUTE(s16, p_volume_min);
2074 UAC2_ATTRIBUTE(s16, p_volume_max);
2075 UAC2_ATTRIBUTE(s16, p_volume_res);
2076
2077 UAC2_ATTRIBUTE(bool, c_mute_present);
2078 UAC2_ATTRIBUTE(bool, c_volume_present);
2079 UAC2_ATTRIBUTE(s16, c_volume_min);
2080 UAC2_ATTRIBUTE(s16, c_volume_max);
2081 UAC2_ATTRIBUTE(s16, c_volume_res);
2082 UAC2_ATTRIBUTE(u32, fb_max);
2083 UAC2_ATTRIBUTE_STRING(function_name);
2084
2085 static struct configfs_attribute *f_uac2_attrs[] = {
2086         &f_uac2_opts_attr_p_chmask,
2087         &f_uac2_opts_attr_p_srate,
2088         &f_uac2_opts_attr_p_ssize,
2089         &f_uac2_opts_attr_p_hs_bint,
2090         &f_uac2_opts_attr_c_chmask,
2091         &f_uac2_opts_attr_c_srate,
2092         &f_uac2_opts_attr_c_ssize,
2093         &f_uac2_opts_attr_c_hs_bint,
2094         &f_uac2_opts_attr_c_sync,
2095         &f_uac2_opts_attr_req_number,
2096         &f_uac2_opts_attr_fb_max,
2097
2098         &f_uac2_opts_attr_p_mute_present,
2099         &f_uac2_opts_attr_p_volume_present,
2100         &f_uac2_opts_attr_p_volume_min,
2101         &f_uac2_opts_attr_p_volume_max,
2102         &f_uac2_opts_attr_p_volume_res,
2103
2104         &f_uac2_opts_attr_c_mute_present,
2105         &f_uac2_opts_attr_c_volume_present,
2106         &f_uac2_opts_attr_c_volume_min,
2107         &f_uac2_opts_attr_c_volume_max,
2108         &f_uac2_opts_attr_c_volume_res,
2109
2110         &f_uac2_opts_attr_function_name,
2111
2112         NULL,
2113 };
2114
2115 static const struct config_item_type f_uac2_func_type = {
2116         .ct_item_ops    = &f_uac2_item_ops,
2117         .ct_attrs       = f_uac2_attrs,
2118         .ct_owner       = THIS_MODULE,
2119 };
2120
2121 static void afunc_free_inst(struct usb_function_instance *f)
2122 {
2123         struct f_uac2_opts *opts;
2124
2125         opts = container_of(f, struct f_uac2_opts, func_inst);
2126         kfree(opts);
2127 }
2128
2129 static struct usb_function_instance *afunc_alloc_inst(void)
2130 {
2131         struct f_uac2_opts *opts;
2132
2133         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2134         if (!opts)
2135                 return ERR_PTR(-ENOMEM);
2136
2137         mutex_init(&opts->lock);
2138         opts->func_inst.free_func_inst = afunc_free_inst;
2139
2140         config_group_init_type_name(&opts->func_inst.group, "",
2141                                     &f_uac2_func_type);
2142
2143         opts->p_chmask = UAC2_DEF_PCHMASK;
2144         opts->p_srates[0] = UAC2_DEF_PSRATE;
2145         opts->p_ssize = UAC2_DEF_PSSIZE;
2146         opts->p_hs_bint = UAC2_DEF_PHSBINT;
2147         opts->c_chmask = UAC2_DEF_CCHMASK;
2148         opts->c_srates[0] = UAC2_DEF_CSRATE;
2149         opts->c_ssize = UAC2_DEF_CSSIZE;
2150         opts->c_hs_bint = UAC2_DEF_CHSBINT;
2151         opts->c_sync = UAC2_DEF_CSYNC;
2152
2153         opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
2154         opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
2155         opts->p_volume_min = UAC2_DEF_MIN_DB;
2156         opts->p_volume_max = UAC2_DEF_MAX_DB;
2157         opts->p_volume_res = UAC2_DEF_RES_DB;
2158
2159         opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
2160         opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
2161         opts->c_volume_min = UAC2_DEF_MIN_DB;
2162         opts->c_volume_max = UAC2_DEF_MAX_DB;
2163         opts->c_volume_res = UAC2_DEF_RES_DB;
2164
2165         opts->req_number = UAC2_DEF_REQ_NUM;
2166         opts->fb_max = FBACK_FAST_MAX;
2167
2168         snprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
2169
2170         return &opts->func_inst;
2171 }
2172
2173 static void afunc_free(struct usb_function *f)
2174 {
2175         struct g_audio *agdev;
2176         struct f_uac2_opts *opts;
2177
2178         agdev = func_to_g_audio(f);
2179         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
2180         kfree(agdev);
2181         mutex_lock(&opts->lock);
2182         --opts->refcnt;
2183         mutex_unlock(&opts->lock);
2184 }
2185
2186 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
2187 {
2188         struct g_audio *agdev = func_to_g_audio(f);
2189
2190         g_audio_cleanup(agdev);
2191         usb_free_all_descriptors(f);
2192
2193         agdev->gadget = NULL;
2194
2195         kfree(out_feature_unit_desc);
2196         out_feature_unit_desc = NULL;
2197         kfree(in_feature_unit_desc);
2198         in_feature_unit_desc = NULL;
2199 }
2200
2201 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
2202 {
2203         struct f_uac2   *uac2;
2204         struct f_uac2_opts *opts;
2205
2206         uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
2207         if (uac2 == NULL)
2208                 return ERR_PTR(-ENOMEM);
2209
2210         opts = container_of(fi, struct f_uac2_opts, func_inst);
2211         mutex_lock(&opts->lock);
2212         ++opts->refcnt;
2213         mutex_unlock(&opts->lock);
2214
2215         uac2->g_audio.func.name = "uac2_func";
2216         uac2->g_audio.func.bind = afunc_bind;
2217         uac2->g_audio.func.unbind = afunc_unbind;
2218         uac2->g_audio.func.set_alt = afunc_set_alt;
2219         uac2->g_audio.func.get_alt = afunc_get_alt;
2220         uac2->g_audio.func.disable = afunc_disable;
2221         uac2->g_audio.func.suspend = afunc_suspend;
2222         uac2->g_audio.func.setup = afunc_setup;
2223         uac2->g_audio.func.free_func = afunc_free;
2224
2225         return &uac2->g_audio.func;
2226 }
2227
2228 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
2229 MODULE_LICENSE("GPL");
2230 MODULE_AUTHOR("Yadwinder Singh");
2231 MODULE_AUTHOR("Jaswinder Singh");
2232 MODULE_AUTHOR("Ruslan Bilovol");