drivers/usb/gadget/function/f_uac2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * f_uac2.c -- USB Audio Class 2.0 Function
   4  *
   5  * Copyright (C) 2011
   6  *    Yadwinder Singh (yadi.brar01@gmail.com)
   7  *    Jaswinder Singh (jaswinder.singh@linaro.org)
   8  *
   9  * Copyright (C) 2020
  10  *    Ruslan Bilovol (ruslan.bilovol@gmail.com)
  11  */
  12
  13 #include <linux/usb/audio.h>
  14 #include <linux/usb/audio-v2.h>
  15 #include <linux/module.h>
  16
  17 #include "u_audio.h"
  18
  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 = DYNAMIC */
 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 = DYNAMIC */
 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 static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
 295         .bLength = sizeof(ss_ep_int_desc_comp),
 296         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 297         .wBytesPerInterval = cpu_to_le16(6),
 298 };
 299
 300 /* Audio Streaming OUT Interface - Alt0 */
 301 static struct usb_interface_descriptor std_as_out_if0_desc = {
 302         .bLength = sizeof std_as_out_if0_desc,
 303         .bDescriptorType = USB_DT_INTERFACE,
 304
 305         .bAlternateSetting = 0,
 306         .bNumEndpoints = 0,
 307         .bInterfaceClass = USB_CLASS_AUDIO,
 308         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 309         .bInterfaceProtocol = UAC_VERSION_2,
 310 };
 311
 312 /* Audio Streaming OUT Interface - Alt1 */
 313 static struct usb_interface_descriptor std_as_out_if1_desc = {
 314         .bLength = sizeof std_as_out_if1_desc,
 315         .bDescriptorType = USB_DT_INTERFACE,
 316
 317         .bAlternateSetting = 1,
 318         .bNumEndpoints = 1,
 319         .bInterfaceClass = USB_CLASS_AUDIO,
 320         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 321         .bInterfaceProtocol = UAC_VERSION_2,
 322 };
 323
 324 /* Audio Stream OUT Intface Desc */
 325 static struct uac2_as_header_descriptor as_out_hdr_desc = {
 326         .bLength = sizeof as_out_hdr_desc,
 327         .bDescriptorType = USB_DT_CS_INTERFACE,
 328
 329         .bDescriptorSubtype = UAC_AS_GENERAL,
 330         /* .bTerminalLink = DYNAMIC */
 331         .bmControls = 0,
 332         .bFormatType = UAC_FORMAT_TYPE_I,
 333         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 334         .iChannelNames = 0,
 335 };
 336
 337 /* Audio USB_OUT Format */
 338 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 339         .bLength = sizeof as_out_fmt1_desc,
 340         .bDescriptorType = USB_DT_CS_INTERFACE,
 341         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 342         .bFormatType = UAC_FORMAT_TYPE_I,
 343 };
 344
 345 /* STD AS ISO OUT Endpoint */
 346 static struct usb_endpoint_descriptor fs_epout_desc = {
 347         .bLength = USB_DT_ENDPOINT_SIZE,
 348         .bDescriptorType = USB_DT_ENDPOINT,
 349
 350         .bEndpointAddress = USB_DIR_OUT,
 351         /* .bmAttributes = DYNAMIC */
 352         /* .wMaxPacketSize = DYNAMIC */
 353         .bInterval = 1,
 354 };
 355
 356 static struct usb_endpoint_descriptor hs_epout_desc = {
 357         .bLength = USB_DT_ENDPOINT_SIZE,
 358         .bDescriptorType = USB_DT_ENDPOINT,
 359
 360         /* .bmAttributes = DYNAMIC */
 361         /* .wMaxPacketSize = DYNAMIC */
 362         /* .bInterval = DYNAMIC */
 363 };
 364
 365 static struct usb_endpoint_descriptor ss_epout_desc = {
 366         .bLength = USB_DT_ENDPOINT_SIZE,
 367         .bDescriptorType = USB_DT_ENDPOINT,
 368
 369         .bEndpointAddress = USB_DIR_OUT,
 370         /* .bmAttributes = DYNAMIC */
 371         /* .wMaxPacketSize = DYNAMIC */
 372         /* .bInterval = DYNAMIC */
 373 };
 374
 375 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
 376         .bLength                = sizeof(ss_epout_desc_comp),
 377         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 378         .bMaxBurst              = 0,
 379         .bmAttributes           = 0,
 380         /* wBytesPerInterval = DYNAMIC */
 381 };
 382
 383 /* CS AS ISO OUT Endpoint */
 384 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 385         .bLength = sizeof as_iso_out_desc,
 386         .bDescriptorType = USB_DT_CS_ENDPOINT,
 387
 388         .bDescriptorSubtype = UAC_EP_GENERAL,
 389         .bmAttributes = 0,
 390         .bmControls = 0,
 391         .bLockDelayUnits = 0,
 392         .wLockDelay = 0,
 393 };
 394
 395 /* STD AS ISO IN Feedback Endpoint */
 396 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
 397         .bLength = USB_DT_ENDPOINT_SIZE,
 398         .bDescriptorType = USB_DT_ENDPOINT,
 399
 400         .bEndpointAddress = USB_DIR_IN,
 401         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 402         .wMaxPacketSize = cpu_to_le16(3),
 403         .bInterval = 1,
 404 };
 405
 406 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
 407         .bLength = USB_DT_ENDPOINT_SIZE,
 408         .bDescriptorType = USB_DT_ENDPOINT,
 409
 410         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 411         .wMaxPacketSize = cpu_to_le16(4),
 412         .bInterval = 4,
 413 };
 414
 415 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
 416         .bLength = USB_DT_ENDPOINT_SIZE,
 417         .bDescriptorType = USB_DT_ENDPOINT,
 418
 419         .bEndpointAddress = USB_DIR_IN,
 420         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 421         .wMaxPacketSize = cpu_to_le16(4),
 422         .bInterval = 4,
 423 };
 424
 425 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
 426         .bLength                = sizeof(ss_epin_fback_desc_comp),
 427         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 428         .bMaxBurst              = 0,
 429         .bmAttributes           = 0,
 430         .wBytesPerInterval      = cpu_to_le16(4),
 431 };
 432
 433
 434 /* Audio Streaming IN Interface - Alt0 */
 435 static struct usb_interface_descriptor std_as_in_if0_desc = {
 436         .bLength = sizeof std_as_in_if0_desc,
 437         .bDescriptorType = USB_DT_INTERFACE,
 438
 439         .bAlternateSetting = 0,
 440         .bNumEndpoints = 0,
 441         .bInterfaceClass = USB_CLASS_AUDIO,
 442         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 443         .bInterfaceProtocol = UAC_VERSION_2,
 444 };
 445
 446 /* Audio Streaming IN Interface - Alt1 */
 447 static struct usb_interface_descriptor std_as_in_if1_desc = {
 448         .bLength = sizeof std_as_in_if1_desc,
 449         .bDescriptorType = USB_DT_INTERFACE,
 450
 451         .bAlternateSetting = 1,
 452         .bNumEndpoints = 1,
 453         .bInterfaceClass = USB_CLASS_AUDIO,
 454         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 455         .bInterfaceProtocol = UAC_VERSION_2,
 456 };
 457
 458 /* Audio Stream IN Intface Desc */
 459 static struct uac2_as_header_descriptor as_in_hdr_desc = {
 460         .bLength = sizeof as_in_hdr_desc,
 461         .bDescriptorType = USB_DT_CS_INTERFACE,
 462
 463         .bDescriptorSubtype = UAC_AS_GENERAL,
 464         /* .bTerminalLink = DYNAMIC */
 465         .bmControls = 0,
 466         .bFormatType = UAC_FORMAT_TYPE_I,
 467         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 468         .iChannelNames = 0,
 469 };
 470
 471 /* Audio USB_IN Format */
 472 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 473         .bLength = sizeof as_in_fmt1_desc,
 474         .bDescriptorType = USB_DT_CS_INTERFACE,
 475         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 476         .bFormatType = UAC_FORMAT_TYPE_I,
 477 };
 478
 479 /* STD AS ISO IN Endpoint */
 480 static struct usb_endpoint_descriptor fs_epin_desc = {
 481         .bLength = USB_DT_ENDPOINT_SIZE,
 482         .bDescriptorType = USB_DT_ENDPOINT,
 483
 484         .bEndpointAddress = USB_DIR_IN,
 485         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 486         /* .wMaxPacketSize = DYNAMIC */
 487         .bInterval = 1,
 488 };
 489
 490 static struct usb_endpoint_descriptor hs_epin_desc = {
 491         .bLength = USB_DT_ENDPOINT_SIZE,
 492         .bDescriptorType = USB_DT_ENDPOINT,
 493
 494         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 495         /* .wMaxPacketSize = DYNAMIC */
 496         /* .bInterval = DYNAMIC */
 497 };
 498
 499 static struct usb_endpoint_descriptor ss_epin_desc = {
 500         .bLength = USB_DT_ENDPOINT_SIZE,
 501         .bDescriptorType = USB_DT_ENDPOINT,
 502
 503         .bEndpointAddress = USB_DIR_IN,
 504         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 505         /* .wMaxPacketSize = DYNAMIC */
 506         /* .bInterval = DYNAMIC */
 507 };
 508
 509 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
 510         .bLength                = sizeof(ss_epin_desc_comp),
 511         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 512         .bMaxBurst              = 0,
 513         .bmAttributes           = 0,
 514         /* wBytesPerInterval = DYNAMIC */
 515 };
 516
 517 /* CS AS ISO IN Endpoint */
 518 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 519         .bLength = sizeof as_iso_in_desc,
 520         .bDescriptorType = USB_DT_CS_ENDPOINT,
 521
 522         .bDescriptorSubtype = UAC_EP_GENERAL,
 523         .bmAttributes = 0,
 524         .bmControls = 0,
 525         .bLockDelayUnits = 0,
 526         .wLockDelay = 0,
 527 };
 528
 529 static struct usb_descriptor_header *fs_audio_desc[] = {
 530         (struct usb_descriptor_header *)&iad_desc,
 531         (struct usb_descriptor_header *)&std_ac_if_desc,
 532
 533         (struct usb_descriptor_header *)&ac_hdr_desc,
 534         (struct usb_descriptor_header *)&in_clk_src_desc,
 535         (struct usb_descriptor_header *)&out_clk_src_desc,
 536         (struct usb_descriptor_header *)&usb_out_it_desc,
 537         (struct usb_descriptor_header *)&out_feature_unit_desc,
 538         (struct usb_descriptor_header *)&io_in_it_desc,
 539         (struct usb_descriptor_header *)&usb_in_ot_desc,
 540         (struct usb_descriptor_header *)&in_feature_unit_desc,
 541         (struct usb_descriptor_header *)&io_out_ot_desc,
 542
 543         (struct usb_descriptor_header *)&fs_ep_int_desc,
 544
 545         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 546         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 547
 548         (struct usb_descriptor_header *)&as_out_hdr_desc,
 549         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 550         (struct usb_descriptor_header *)&fs_epout_desc,
 551         (struct usb_descriptor_header *)&as_iso_out_desc,
 552         (struct usb_descriptor_header *)&fs_epin_fback_desc,
 553
 554         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 555         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 556
 557         (struct usb_descriptor_header *)&as_in_hdr_desc,
 558         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 559         (struct usb_descriptor_header *)&fs_epin_desc,
 560         (struct usb_descriptor_header *)&as_iso_in_desc,
 561         NULL,
 562 };
 563
 564 static struct usb_descriptor_header *hs_audio_desc[] = {
 565         (struct usb_descriptor_header *)&iad_desc,
 566         (struct usb_descriptor_header *)&std_ac_if_desc,
 567
 568         (struct usb_descriptor_header *)&ac_hdr_desc,
 569         (struct usb_descriptor_header *)&in_clk_src_desc,
 570         (struct usb_descriptor_header *)&out_clk_src_desc,
 571         (struct usb_descriptor_header *)&usb_out_it_desc,
 572         (struct usb_descriptor_header *)&out_feature_unit_desc,
 573         (struct usb_descriptor_header *)&io_in_it_desc,
 574         (struct usb_descriptor_header *)&usb_in_ot_desc,
 575         (struct usb_descriptor_header *)&in_feature_unit_desc,
 576         (struct usb_descriptor_header *)&io_out_ot_desc,
 577
 578         (struct usb_descriptor_header *)&hs_ep_int_desc,
 579
 580         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 581         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 582
 583         (struct usb_descriptor_header *)&as_out_hdr_desc,
 584         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 585         (struct usb_descriptor_header *)&hs_epout_desc,
 586         (struct usb_descriptor_header *)&as_iso_out_desc,
 587         (struct usb_descriptor_header *)&hs_epin_fback_desc,
 588
 589         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 590         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 591
 592         (struct usb_descriptor_header *)&as_in_hdr_desc,
 593         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 594         (struct usb_descriptor_header *)&hs_epin_desc,
 595         (struct usb_descriptor_header *)&as_iso_in_desc,
 596         NULL,
 597 };
 598
 599 static struct usb_descriptor_header *ss_audio_desc[] = {
 600         (struct usb_descriptor_header *)&iad_desc,
 601         (struct usb_descriptor_header *)&std_ac_if_desc,
 602
 603         (struct usb_descriptor_header *)&ac_hdr_desc,
 604         (struct usb_descriptor_header *)&in_clk_src_desc,
 605         (struct usb_descriptor_header *)&out_clk_src_desc,
 606         (struct usb_descriptor_header *)&usb_out_it_desc,
 607   (struct usb_descriptor_header *)&out_feature_unit_desc,
 608         (struct usb_descriptor_header *)&io_in_it_desc,
 609         (struct usb_descriptor_header *)&usb_in_ot_desc,
 610         (struct usb_descriptor_header *)&in_feature_unit_desc,
 611         (struct usb_descriptor_header *)&io_out_ot_desc,
 612
 613         (struct usb_descriptor_header *)&ss_ep_int_desc,
 614         (struct usb_descriptor_header *)&ss_ep_int_desc_comp,
 615
 616         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 617         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 618
 619         (struct usb_descriptor_header *)&as_out_hdr_desc,
 620         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 621         (struct usb_descriptor_header *)&ss_epout_desc,
 622         (struct usb_descriptor_header *)&ss_epout_desc_comp,
 623         (struct usb_descriptor_header *)&as_iso_out_desc,
 624         (struct usb_descriptor_header *)&ss_epin_fback_desc,
 625         (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
 626
 627         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 628         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 629
 630         (struct usb_descriptor_header *)&as_in_hdr_desc,
 631         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 632         (struct usb_descriptor_header *)&ss_epin_desc,
 633         (struct usb_descriptor_header *)&ss_epin_desc_comp,
 634         (struct usb_descriptor_header *)&as_iso_in_desc,
 635         NULL,
 636 };
 637
 638 struct cntrl_cur_lay2 {
 639         __le16  wCUR;
 640 };
 641
 642 struct cntrl_range_lay2 {
 643         __le16  wNumSubRanges;
 644         __le16  wMIN;
 645         __le16  wMAX;
 646         __le16  wRES;
 647 } __packed;
 648
 649 struct cntrl_cur_lay3 {
 650         __le32  dCUR;
 651 };
 652
 653 struct cntrl_subrange_lay3 {
 654         __le32  dMIN;
 655         __le32  dMAX;
 656         __le32  dRES;
 657 } __packed;
 658
 659 #define ranges_lay3_size(c) (sizeof(c.wNumSubRanges)    \
 660                 + le16_to_cpu(c.wNumSubRanges)          \
 661                 * sizeof(struct cntrl_subrange_lay3))
 662
 663 #define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n)            \
 664         struct cntrl_ranges_lay3_##k {                  \
 665         __le16  wNumSubRanges;                          \
 666         struct cntrl_subrange_lay3 r[n];                \
 667 } __packed
 668
 669 DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
 670
 671 static int get_max_srate(const int *srates)
 672 {
 673         int i, max_srate = 0;
 674
 675         for (i = 0; i < UAC_MAX_RATES; i++) {
 676                 if (srates[i] == 0)
 677                         break;
 678                 if (srates[i] > max_srate)
 679                         max_srate = srates[i];
 680         }
 681         return max_srate;
 682 }
 683
 684 static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
 685         u8 bint, unsigned int factor, bool is_playback)
 686 {
 687         int chmask, srate, ssize;
 688         u16 max_size_bw;
 689
 690         if (is_playback) {
 691                 chmask = uac2_opts->p_chmask;
 692                 srate = get_max_srate(uac2_opts->p_srates);
 693                 ssize = uac2_opts->p_ssize;
 694         } else {
 695                 chmask = uac2_opts->c_chmask;
 696                 srate = get_max_srate(uac2_opts->c_srates);
 697                 ssize = uac2_opts->c_ssize;
 698         }
 699
 700         if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
 701                 // playback is always async, capture only when configured
 702                 // Win10 requires max packet size + 1 frame
 703                 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
 704                 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
 705                 max_size_bw = num_channels(chmask) * ssize *
 706                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
 707         } else {
 708                 // adding 1 frame provision for Win10
 709                 max_size_bw = num_channels(chmask) * ssize *
 710                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
 711         }
 712         return max_size_bw;
 713 }
 714
 715 static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
 716         struct usb_endpoint_descriptor *ep_desc,
 717         enum usb_device_speed speed, bool is_playback)
 718 {
 719         u16 max_size_bw, max_size_ep;
 720         u8 bint, opts_bint;
 721         char *dir;
 722
 723         switch (speed) {
 724         case USB_SPEED_FULL:
 725                 max_size_ep = 1023;
 726                 // fixed
 727                 bint = ep_desc->bInterval;
 728                 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback);
 729                 break;
 730
 731         case USB_SPEED_HIGH:
 732         case USB_SPEED_SUPER:
 733                 max_size_ep = 1024;
 734                 if (is_playback)
 735                         opts_bint = uac2_opts->p_hs_bint;
 736                 else
 737                         opts_bint = uac2_opts->c_hs_bint;
 738
 739                 if (opts_bint > 0) {
 740                         /* fixed bint */
 741                         bint = opts_bint;
 742                         max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback);
 743                 } else {
 744                         /* checking bInterval from 4 to 1 whether the required bandwidth fits */
 745                         for (bint = 4; bint > 0; --bint) {
 746                                 max_size_bw = get_max_bw_for_bint(
 747                                         uac2_opts, bint, 8000, is_playback);
 748                                 if (max_size_bw <= max_size_ep)
 749                                         break;
 750                         }
 751                 }
 752                 break;
 753
 754         default:
 755                 return -EINVAL;
 756         }
 757
 758         if (is_playback)
 759                 dir = "Playback";
 760         else
 761                 dir = "Capture";
 762
 763         if (max_size_bw <= max_size_ep)
 764                 dev_dbg(dev,
 765                         "%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
 766                         speed_names[speed], dir, max_size_bw, bint);
 767         else {
 768                 dev_warn(dev,
 769                         "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
 770                         speed_names[speed], dir, max_size_bw, bint, max_size_ep);
 771                 max_size_bw = max_size_ep;
 772         }
 773
 774         ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
 775         ep_desc->bInterval = bint;
 776
 777         return 0;
 778 }
 779
 780 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
 781 {
 782         struct uac2_feature_unit_descriptor *fu_desc;
 783         int channels = num_channels(chmask);
 784         int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
 785
 786         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 787         if (!fu_desc)
 788                 return NULL;
 789
 790         fu_desc->bLength = fu_desc_size;
 791         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 792
 793         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 794
 795         /* bUnitID, bSourceID and bmaControls will be defined later */
 796
 797         return fu_desc;
 798 }
 799
 800 /* Use macro to overcome line length limitation */
 801 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
 802
 803 static void setup_headers(struct f_uac2_opts *opts,
 804                           struct usb_descriptor_header **headers,
 805                           enum usb_device_speed speed)
 806 {
 807         struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
 808         struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
 809         struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
 810         struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
 811         struct usb_endpoint_descriptor *epout_desc;
 812         struct usb_endpoint_descriptor *epin_desc;
 813         struct usb_endpoint_descriptor *epin_fback_desc;
 814         struct usb_endpoint_descriptor *ep_int_desc;
 815         int i;
 816
 817         switch (speed) {
 818         case USB_SPEED_FULL:
 819                 epout_desc = &fs_epout_desc;
 820                 epin_desc = &fs_epin_desc;
 821                 epin_fback_desc = &fs_epin_fback_desc;
 822                 ep_int_desc = &fs_ep_int_desc;
 823                 break;
 824         case USB_SPEED_HIGH:
 825                 epout_desc = &hs_epout_desc;
 826                 epin_desc = &hs_epin_desc;
 827                 epin_fback_desc = &hs_epin_fback_desc;
 828                 ep_int_desc = &hs_ep_int_desc;
 829                 break;
 830         default:
 831                 epout_desc = &ss_epout_desc;
 832                 epin_desc = &ss_epin_desc;
 833                 epout_desc_comp = &ss_epout_desc_comp;
 834                 epin_desc_comp = &ss_epin_desc_comp;
 835                 epin_fback_desc = &ss_epin_fback_desc;
 836                 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
 837                 ep_int_desc = &ss_ep_int_desc;
 838                 ep_int_desc_comp = &ss_ep_int_desc_comp;
 839         }
 840
 841         i = 0;
 842         headers[i++] = USBDHDR(&iad_desc);
 843         headers[i++] = USBDHDR(&std_ac_if_desc);
 844         headers[i++] = USBDHDR(&ac_hdr_desc);
 845         if (EPIN_EN(opts))
 846                 headers[i++] = USBDHDR(&in_clk_src_desc);
 847         if (EPOUT_EN(opts)) {
 848                 headers[i++] = USBDHDR(&out_clk_src_desc);
 849                 headers[i++] = USBDHDR(&usb_out_it_desc);
 850
 851                 if (FUOUT_EN(opts))
 852                         headers[i++] = USBDHDR(out_feature_unit_desc);
 853         }
 854
 855         if (EPIN_EN(opts)) {
 856                 headers[i++] = USBDHDR(&io_in_it_desc);
 857
 858                 if (FUIN_EN(opts))
 859                         headers[i++] = USBDHDR(in_feature_unit_desc);
 860
 861                 headers[i++] = USBDHDR(&usb_in_ot_desc);
 862         }
 863
 864         if (EPOUT_EN(opts))
 865                 headers[i++] = USBDHDR(&io_out_ot_desc);
 866
 867         if (FUOUT_EN(opts) || FUIN_EN(opts)) {
 868                 headers[i++] = USBDHDR(ep_int_desc);
 869                 if (ep_int_desc_comp)
 870                         headers[i++] = USBDHDR(ep_int_desc_comp);
 871         }
 872
 873         if (EPOUT_EN(opts)) {
 874                 headers[i++] = USBDHDR(&std_as_out_if0_desc);
 875                 headers[i++] = USBDHDR(&std_as_out_if1_desc);
 876                 headers[i++] = USBDHDR(&as_out_hdr_desc);
 877                 headers[i++] = USBDHDR(&as_out_fmt1_desc);
 878                 headers[i++] = USBDHDR(epout_desc);
 879                 if (epout_desc_comp)
 880                         headers[i++] = USBDHDR(epout_desc_comp);
 881
 882                 headers[i++] = USBDHDR(&as_iso_out_desc);
 883
 884                 if (EPOUT_FBACK_IN_EN(opts)) {
 885                         headers[i++] = USBDHDR(epin_fback_desc);
 886                         if (epin_fback_desc_comp)
 887                                 headers[i++] = USBDHDR(epin_fback_desc_comp);
 888                 }
 889         }
 890
 891         if (EPIN_EN(opts)) {
 892                 headers[i++] = USBDHDR(&std_as_in_if0_desc);
 893                 headers[i++] = USBDHDR(&std_as_in_if1_desc);
 894                 headers[i++] = USBDHDR(&as_in_hdr_desc);
 895                 headers[i++] = USBDHDR(&as_in_fmt1_desc);
 896                 headers[i++] = USBDHDR(epin_desc);
 897                 if (epin_desc_comp)
 898                         headers[i++] = USBDHDR(epin_desc_comp);
 899
 900                 headers[i++] = USBDHDR(&as_iso_in_desc);
 901         }
 902         headers[i] = NULL;
 903 }
 904
 905 static void setup_descriptor(struct f_uac2_opts *opts)
 906 {
 907         /* patch descriptors */
 908         int i = 1; /* ID's start with 1 */
 909
 910         if (EPOUT_EN(opts))
 911                 usb_out_it_desc.bTerminalID = i++;
 912         if (EPIN_EN(opts))
 913                 io_in_it_desc.bTerminalID = i++;
 914         if (EPOUT_EN(opts))
 915                 io_out_ot_desc.bTerminalID = i++;
 916         if (EPIN_EN(opts))
 917                 usb_in_ot_desc.bTerminalID = i++;
 918         if (FUOUT_EN(opts))
 919                 out_feature_unit_desc->bUnitID = i++;
 920         if (FUIN_EN(opts))
 921                 in_feature_unit_desc->bUnitID = i++;
 922         if (EPOUT_EN(opts))
 923                 out_clk_src_desc.bClockID = i++;
 924         if (EPIN_EN(opts))
 925                 in_clk_src_desc.bClockID = i++;
 926
 927         usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
 928
 929         if (FUIN_EN(opts)) {
 930                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
 931                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
 932         } else {
 933                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
 934         }
 935
 936         usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
 937         io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
 938         io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
 939
 940         if (FUOUT_EN(opts)) {
 941                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
 942                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
 943         } else {
 944                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
 945         }
 946
 947         as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
 948         as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 949
 950         iad_desc.bInterfaceCount = 1;
 951         ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 952
 953         if (EPIN_EN(opts)) {
 954                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 955
 956                 len += sizeof(in_clk_src_desc);
 957                 len += sizeof(usb_in_ot_desc);
 958
 959                 if (FUIN_EN(opts))
 960                         len += in_feature_unit_desc->bLength;
 961
 962                 len += sizeof(io_in_it_desc);
 963                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 964                 iad_desc.bInterfaceCount++;
 965         }
 966         if (EPOUT_EN(opts)) {
 967                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 968
 969                 len += sizeof(out_clk_src_desc);
 970                 len += sizeof(usb_out_it_desc);
 971
 972                 if (FUOUT_EN(opts))
 973                         len += out_feature_unit_desc->bLength;
 974
 975                 len += sizeof(io_out_ot_desc);
 976                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 977                 iad_desc.bInterfaceCount++;
 978         }
 979
 980         io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type);
 981         io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type);
 982
 983         setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
 984         setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
 985         setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
 986 }
 987
 988 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
 989 {
 990         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
 991         const char *msg = NULL;
 992
 993         if (!opts->p_chmask && !opts->c_chmask)
 994                 msg = "no playback and capture channels";
 995         else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
 996                 msg = "unsupported playback channels mask";
 997         else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
 998                 msg = "unsupported capture channels mask";
 999         else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
1000                 msg = "incorrect playback sample size";
1001         else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
1002                 msg = "incorrect capture sample size";
1003         else if (!opts->p_srates[0])
1004                 msg = "incorrect playback sampling rate";
1005         else if (!opts->c_srates[0])
1006                 msg = "incorrect capture sampling rate";
1007
1008         else if (opts->p_volume_max <= opts->p_volume_min)
1009                 msg = "incorrect playback volume max/min";
1010         else if (opts->c_volume_max <= opts->c_volume_min)
1011                 msg = "incorrect capture volume max/min";
1012         else if (opts->p_volume_res <= 0)
1013                 msg = "negative/zero playback volume resolution";
1014         else if (opts->c_volume_res <= 0)
1015                 msg = "negative/zero capture volume resolution";
1016
1017         else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
1018                 msg = "incorrect playback volume resolution";
1019         else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
1020                 msg = "incorrect capture volume resolution";
1021
1022         else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
1023                 msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
1024         else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
1025                 msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
1026
1027         if (msg) {
1028                 dev_err(dev, "Error: %s\n", msg);
1029                 return -EINVAL;
1030         }
1031
1032         return 0;
1033 }
1034
1035 static int
1036 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
1037 {
1038         struct f_uac2 *uac2 = func_to_uac2(fn);
1039         struct g_audio *agdev = func_to_g_audio(fn);
1040         struct usb_composite_dev *cdev = cfg->cdev;
1041         struct usb_gadget *gadget = cdev->gadget;
1042         struct device *dev = &gadget->dev;
1043         struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
1044         struct usb_string *us;
1045         int ret;
1046
1047         ret = afunc_validate_opts(agdev, dev);
1048         if (ret)
1049                 return ret;
1050
1051         strings_fn[STR_ASSOC].s = uac2_opts->function_name;
1052
1053         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
1054         if (IS_ERR(us))
1055                 return PTR_ERR(us);
1056
1057         if (FUOUT_EN(uac2_opts)) {
1058                 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
1059                 if (!out_feature_unit_desc)
1060                         return -ENOMEM;
1061         }
1062         if (FUIN_EN(uac2_opts)) {
1063                 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
1064                 if (!in_feature_unit_desc) {
1065                         ret = -ENOMEM;
1066                         goto err_free_fu;
1067                 }
1068         }
1069
1070         iad_desc.iFunction = us[STR_ASSOC].id;
1071         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1072         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1073         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1074         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1075         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1076         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1077         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1078         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1079         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1080         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1081         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1082
1083         if (FUOUT_EN(uac2_opts)) {
1084                 u8 *i_feature = (u8 *)out_feature_unit_desc +
1085                                 out_feature_unit_desc->bLength - 1;
1086                 *i_feature = us[STR_FU_OUT].id;
1087         }
1088         if (FUIN_EN(uac2_opts)) {
1089                 u8 *i_feature = (u8 *)in_feature_unit_desc +
1090                                 in_feature_unit_desc->bLength - 1;
1091                 *i_feature = us[STR_FU_IN].id;
1092         }
1093
1094
1095         /* Initialize the configurable parameters */
1096         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1097         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1098         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1099         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1100         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1101         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1102         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1103         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1104         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1105         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1106         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1107         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1108         if (FUOUT_EN(uac2_opts)) {
1109                 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1110                 u32 control = 0;
1111
1112                 if (uac2_opts->c_mute_present)
1113                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1114                 if (uac2_opts->c_volume_present)
1115                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1116                 *bma = cpu_to_le32(control);
1117         }
1118         if (FUIN_EN(uac2_opts)) {
1119                 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1120                 u32 control = 0;
1121
1122                 if (uac2_opts->p_mute_present)
1123                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1124                 if (uac2_opts->p_volume_present)
1125                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1126                 *bma = cpu_to_le32(control);
1127         }
1128
1129         ret = usb_interface_id(cfg, fn);
1130         if (ret < 0) {
1131                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1132                 goto err_free_fu;
1133         }
1134         iad_desc.bFirstInterface = ret;
1135
1136         std_ac_if_desc.bInterfaceNumber = ret;
1137         uac2->ac_intf = ret;
1138         uac2->ac_alt = 0;
1139
1140         if (EPOUT_EN(uac2_opts)) {
1141                 ret = usb_interface_id(cfg, fn);
1142                 if (ret < 0) {
1143                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1144                         goto err_free_fu;
1145                 }
1146                 std_as_out_if0_desc.bInterfaceNumber = ret;
1147                 std_as_out_if1_desc.bInterfaceNumber = ret;
1148                 std_as_out_if1_desc.bNumEndpoints = 1;
1149                 uac2->as_out_intf = ret;
1150                 uac2->as_out_alt = 0;
1151
1152                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1153                         fs_epout_desc.bmAttributes =
1154                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1155                         hs_epout_desc.bmAttributes =
1156                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1157                         ss_epout_desc.bmAttributes =
1158                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1159                         std_as_out_if1_desc.bNumEndpoints++;
1160                 } else {
1161                         fs_epout_desc.bmAttributes =
1162                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1163                         hs_epout_desc.bmAttributes =
1164                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1165                         ss_epout_desc.bmAttributes =
1166                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1167                 }
1168         }
1169
1170         if (EPIN_EN(uac2_opts)) {
1171                 ret = usb_interface_id(cfg, fn);
1172                 if (ret < 0) {
1173                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1174                         goto err_free_fu;
1175                 }
1176                 std_as_in_if0_desc.bInterfaceNumber = ret;
1177                 std_as_in_if1_desc.bInterfaceNumber = ret;
1178                 uac2->as_in_intf = ret;
1179                 uac2->as_in_alt = 0;
1180         }
1181
1182         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1183                 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1184                 if (!uac2->int_ep) {
1185                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1186                         ret = -ENODEV;
1187                         goto err_free_fu;
1188                 }
1189
1190                 std_ac_if_desc.bNumEndpoints = 1;
1191         }
1192
1193         hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
1194         ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
1195         hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
1196         ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
1197
1198         /* Calculate wMaxPacketSize according to audio bandwidth */
1199         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc,
1200                                         USB_SPEED_FULL, true);
1201         if (ret < 0) {
1202                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1203                 return ret;
1204         }
1205
1206         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc,
1207                                         USB_SPEED_FULL, false);
1208         if (ret < 0) {
1209                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1210                 return ret;
1211         }
1212
1213         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc,
1214                                         USB_SPEED_HIGH, true);
1215         if (ret < 0) {
1216                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1217                 return ret;
1218         }
1219
1220         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc,
1221                                         USB_SPEED_HIGH, false);
1222         if (ret < 0) {
1223                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1224                 return ret;
1225         }
1226
1227         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc,
1228                                         USB_SPEED_SUPER, true);
1229         if (ret < 0) {
1230                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1231                 return ret;
1232         }
1233
1234         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc,
1235                                         USB_SPEED_SUPER, false);
1236         if (ret < 0) {
1237                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1238                 return ret;
1239         }
1240
1241         if (EPOUT_EN(uac2_opts)) {
1242                 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1243                 if (!agdev->out_ep) {
1244                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1245                         ret = -ENODEV;
1246                         goto err_free_fu;
1247                 }
1248                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1249                         agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1250                                                        &fs_epin_fback_desc);
1251                         if (!agdev->in_ep_fback) {
1252                                 dev_err(dev, "%s:%d Error!\n",
1253                                         __func__, __LINE__);
1254                                 ret = -ENODEV;
1255                                 goto err_free_fu;
1256                         }
1257                 }
1258         }
1259
1260         if (EPIN_EN(uac2_opts)) {
1261                 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1262                 if (!agdev->in_ep) {
1263                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1264                         ret = -ENODEV;
1265                         goto err_free_fu;
1266                 }
1267         }
1268
1269         agdev->in_ep_maxpsize = max_t(u16,
1270                                 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1271                                 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1272         agdev->out_ep_maxpsize = max_t(u16,
1273                                 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1274                                 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1275
1276         agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1277                                 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1278         agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1279                                 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1280
1281         ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1282         ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1283
1284         // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1285         hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1286         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1287         hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1288         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1289         ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1290         ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1291         ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1292         ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1293
1294         setup_descriptor(uac2_opts);
1295
1296         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1297                                      ss_audio_desc);
1298         if (ret)
1299                 goto err_free_fu;
1300
1301         agdev->gadget = gadget;
1302
1303         agdev->params.p_chmask = uac2_opts->p_chmask;
1304         memcpy(agdev->params.p_srates, uac2_opts->p_srates,
1305                         sizeof(agdev->params.p_srates));
1306         agdev->params.p_ssize = uac2_opts->p_ssize;
1307         if (FUIN_EN(uac2_opts)) {
1308                 agdev->params.p_fu.id = USB_IN_FU_ID;
1309                 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1310                 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1311                 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1312                 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1313                 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1314         }
1315         agdev->params.c_chmask = uac2_opts->c_chmask;
1316         memcpy(agdev->params.c_srates, uac2_opts->c_srates,
1317                         sizeof(agdev->params.c_srates));
1318         agdev->params.c_ssize = uac2_opts->c_ssize;
1319         if (FUOUT_EN(uac2_opts)) {
1320                 agdev->params.c_fu.id = USB_OUT_FU_ID;
1321                 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1322                 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1323                 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1324                 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1325                 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1326         }
1327         agdev->params.req_number = uac2_opts->req_number;
1328         agdev->params.fb_max = uac2_opts->fb_max;
1329
1330         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1331     agdev->notify = afunc_notify;
1332
1333         ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1334         if (ret)
1335                 goto err_free_descs;
1336
1337         return 0;
1338
1339 err_free_descs:
1340         usb_free_all_descriptors(fn);
1341         agdev->gadget = NULL;
1342 err_free_fu:
1343         kfree(out_feature_unit_desc);
1344         out_feature_unit_desc = NULL;
1345         kfree(in_feature_unit_desc);
1346         in_feature_unit_desc = NULL;
1347         return ret;
1348 }
1349
1350 static void
1351 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1352 {
1353         struct g_audio *agdev = req->context;
1354         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1355
1356         atomic_dec(&uac2->int_count);
1357         kfree(req->buf);
1358         usb_ep_free_request(_ep, req);
1359 }
1360
1361 static int
1362 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1363 {
1364         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1365         struct usb_request *req;
1366         struct uac2_interrupt_data_msg *msg;
1367         u16 w_index, w_value;
1368         int ret;
1369
1370         if (!uac2->int_ep->enabled)
1371                 return 0;
1372
1373         if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1374                 atomic_dec(&uac2->int_count);
1375                 return 0;
1376         }
1377
1378         req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1379         if (req == NULL) {
1380                 ret = -ENOMEM;
1381                 goto err_dec_int_count;
1382         }
1383
1384         msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1385         if (msg == NULL) {
1386                 ret = -ENOMEM;
1387                 goto err_free_request;
1388         }
1389
1390         w_index = unit_id << 8 | uac2->ac_intf;
1391         w_value = cs << 8;
1392
1393         msg->bInfo = 0; /* Non-vendor, interface interrupt */
1394         msg->bAttribute = UAC2_CS_CUR;
1395         msg->wIndex = cpu_to_le16(w_index);
1396         msg->wValue = cpu_to_le16(w_value);
1397
1398         req->length = sizeof(*msg);
1399         req->buf = msg;
1400         req->context = agdev;
1401         req->complete = afunc_notify_complete;
1402
1403         ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1404
1405         if (ret)
1406                 goto err_free_msg;
1407
1408         return 0;
1409
1410 err_free_msg:
1411         kfree(msg);
1412 err_free_request:
1413         usb_ep_free_request(uac2->int_ep, req);
1414 err_dec_int_count:
1415         atomic_dec(&uac2->int_count);
1416
1417         return ret;
1418 }
1419
1420 static int
1421 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1422 {
1423         struct usb_composite_dev *cdev = fn->config->cdev;
1424         struct f_uac2 *uac2 = func_to_uac2(fn);
1425         struct g_audio *agdev = func_to_g_audio(fn);
1426         struct usb_gadget *gadget = cdev->gadget;
1427         struct device *dev = &gadget->dev;
1428         int ret = 0;
1429
1430         /* No i/f has more than 2 alt settings */
1431         if (alt > 1) {
1432                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1433                 return -EINVAL;
1434         }
1435
1436         if (intf == uac2->ac_intf) {
1437                 /* Control I/f has only 1 AltSetting - 0 */
1438                 if (alt) {
1439                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1440                         return -EINVAL;
1441                 }
1442
1443                 /* restart interrupt endpoint */
1444                 if (uac2->int_ep) {
1445                         usb_ep_disable(uac2->int_ep);
1446                         config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1447                         usb_ep_enable(uac2->int_ep);
1448                 }
1449
1450                 return 0;
1451         }
1452
1453         if (intf == uac2->as_out_intf) {
1454                 uac2->as_out_alt = alt;
1455
1456                 if (alt)
1457                         ret = u_audio_start_capture(&uac2->g_audio);
1458                 else
1459                         u_audio_stop_capture(&uac2->g_audio);
1460         } else if (intf == uac2->as_in_intf) {
1461                 uac2->as_in_alt = alt;
1462
1463                 if (alt)
1464                         ret = u_audio_start_playback(&uac2->g_audio);
1465                 else
1466                         u_audio_stop_playback(&uac2->g_audio);
1467         } else {
1468                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1469                 return -EINVAL;
1470         }
1471
1472         return ret;
1473 }
1474
1475 static int
1476 afunc_get_alt(struct usb_function *fn, unsigned intf)
1477 {
1478         struct f_uac2 *uac2 = func_to_uac2(fn);
1479         struct g_audio *agdev = func_to_g_audio(fn);
1480
1481         if (intf == uac2->ac_intf)
1482                 return uac2->ac_alt;
1483         else if (intf == uac2->as_out_intf)
1484                 return uac2->as_out_alt;
1485         else if (intf == uac2->as_in_intf)
1486                 return uac2->as_in_alt;
1487         else
1488                 dev_err(&agdev->gadget->dev,
1489                         "%s:%d Invalid Interface %d!\n",
1490                         __func__, __LINE__, intf);
1491
1492         return -EINVAL;
1493 }
1494
1495 static void
1496 afunc_disable(struct usb_function *fn)
1497 {
1498         struct f_uac2 *uac2 = func_to_uac2(fn);
1499
1500         uac2->as_in_alt = 0;
1501         uac2->as_out_alt = 0;
1502         u_audio_stop_capture(&uac2->g_audio);
1503         u_audio_stop_playback(&uac2->g_audio);
1504         if (uac2->int_ep)
1505                 usb_ep_disable(uac2->int_ep);
1506 }
1507
1508 static void
1509 afunc_suspend(struct usb_function *fn)
1510 {
1511         struct f_uac2 *uac2 = func_to_uac2(fn);
1512
1513         u_audio_suspend(&uac2->g_audio);
1514 }
1515
1516 static int
1517 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1518 {
1519         struct usb_request *req = fn->config->cdev->req;
1520         struct g_audio *agdev = func_to_g_audio(fn);
1521         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1522         u16 w_length = le16_to_cpu(cr->wLength);
1523         u16 w_index = le16_to_cpu(cr->wIndex);
1524         u16 w_value = le16_to_cpu(cr->wValue);
1525         u8 entity_id = (w_index >> 8) & 0xff;
1526         u8 control_selector = w_value >> 8;
1527         int value = -EOPNOTSUPP;
1528         u32 p_srate, c_srate;
1529
1530         u_audio_get_playback_srate(agdev, &p_srate);
1531         u_audio_get_capture_srate(agdev, &c_srate);
1532
1533         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1534                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1535                         struct cntrl_cur_lay3 c;
1536
1537                         memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1538
1539                         if (entity_id == USB_IN_CLK_ID)
1540                                 c.dCUR = cpu_to_le32(p_srate);
1541                         else if (entity_id == USB_OUT_CLK_ID)
1542                                 c.dCUR = cpu_to_le32(c_srate);
1543
1544                         value = min_t(unsigned int, w_length, sizeof(c));
1545                         memcpy(req->buf, &c, value);
1546                 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1547                         *(u8 *)req->buf = 1;
1548                         value = min_t(unsigned int, w_length, 1);
1549                 } else {
1550                         dev_err(&agdev->gadget->dev,
1551                                 "%s:%d control_selector=%d TODO!\n",
1552                                 __func__, __LINE__, control_selector);
1553                 }
1554         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1555                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1556                 unsigned int is_playback = 0;
1557
1558                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1559                         is_playback = 1;
1560
1561                 if (control_selector == UAC_FU_MUTE) {
1562                         unsigned int mute;
1563
1564                         u_audio_get_mute(agdev, is_playback, &mute);
1565
1566                         *(u8 *)req->buf = mute;
1567                         value = min_t(unsigned int, w_length, 1);
1568                 } else if (control_selector == UAC_FU_VOLUME) {
1569                         struct cntrl_cur_lay2 c;
1570                         s16 volume;
1571
1572                         memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1573
1574                         u_audio_get_volume(agdev, is_playback, &volume);
1575                         c.wCUR = cpu_to_le16(volume);
1576
1577                         value = min_t(unsigned int, w_length, sizeof(c));
1578                         memcpy(req->buf, &c, value);
1579                 } else {
1580                         dev_err(&agdev->gadget->dev,
1581                                 "%s:%d control_selector=%d TODO!\n",
1582                                 __func__, __LINE__, control_selector);
1583                 }
1584         } else {
1585                 dev_err(&agdev->gadget->dev,
1586                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1587                         __func__, __LINE__, entity_id, control_selector);
1588         }
1589
1590         return value;
1591 }
1592
1593 static int
1594 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1595 {
1596         struct usb_request *req = fn->config->cdev->req;
1597         struct g_audio *agdev = func_to_g_audio(fn);
1598         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1599         u16 w_length = le16_to_cpu(cr->wLength);
1600         u16 w_index = le16_to_cpu(cr->wIndex);
1601         u16 w_value = le16_to_cpu(cr->wValue);
1602         u8 entity_id = (w_index >> 8) & 0xff;
1603         u8 control_selector = w_value >> 8;
1604         int value = -EOPNOTSUPP;
1605
1606         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1607                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1608                         struct cntrl_ranges_lay3_srates rs;
1609                         int i;
1610                         int wNumSubRanges = 0;
1611                         int srate;
1612                         int *srates;
1613
1614                         if (entity_id == USB_IN_CLK_ID)
1615                                 srates = opts->p_srates;
1616                         else if (entity_id == USB_OUT_CLK_ID)
1617                                 srates = opts->c_srates;
1618                         else
1619                                 return -EOPNOTSUPP;
1620                         for (i = 0; i < UAC_MAX_RATES; i++) {
1621                                 srate = srates[i];
1622                                 if (srate == 0)
1623                                         break;
1624
1625                                 rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
1626                                 rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
1627                                 rs.r[wNumSubRanges].dRES = 0;
1628                                 wNumSubRanges++;
1629                                 dev_dbg(&agdev->gadget->dev,
1630                                         "%s(): clk %d: rate ID %d: %d\n",
1631                                         __func__, entity_id, wNumSubRanges, srate);
1632                         }
1633                         rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
1634                         value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
1635                         dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
1636                                 __func__, rs.wNumSubRanges, value);
1637                         memcpy(req->buf, &rs, value);
1638                 } else {
1639                         dev_err(&agdev->gadget->dev,
1640                                 "%s:%d control_selector=%d TODO!\n",
1641                                 __func__, __LINE__, control_selector);
1642                 }
1643         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1644                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1645                 unsigned int is_playback = 0;
1646
1647                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1648                         is_playback = 1;
1649
1650                 if (control_selector == UAC_FU_VOLUME) {
1651                         struct cntrl_range_lay2 r;
1652                         s16 max_db, min_db, res_db;
1653
1654                         if (is_playback) {
1655                                 max_db = opts->p_volume_max;
1656                                 min_db = opts->p_volume_min;
1657                                 res_db = opts->p_volume_res;
1658                         } else {
1659                                 max_db = opts->c_volume_max;
1660                                 min_db = opts->c_volume_min;
1661                                 res_db = opts->c_volume_res;
1662                         }
1663
1664                         r.wMAX = cpu_to_le16(max_db);
1665                         r.wMIN = cpu_to_le16(min_db);
1666                         r.wRES = cpu_to_le16(res_db);
1667                         r.wNumSubRanges = cpu_to_le16(1);
1668
1669                         value = min_t(unsigned int, w_length, sizeof(r));
1670                         memcpy(req->buf, &r, value);
1671                 } else {
1672                         dev_err(&agdev->gadget->dev,
1673                                 "%s:%d control_selector=%d TODO!\n",
1674                                 __func__, __LINE__, control_selector);
1675                 }
1676         } else {
1677                 dev_err(&agdev->gadget->dev,
1678                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1679                         __func__, __LINE__, entity_id, control_selector);
1680         }
1681
1682         return value;
1683 }
1684
1685 static int
1686 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1687 {
1688         if (cr->bRequest == UAC2_CS_CUR)
1689                 return in_rq_cur(fn, cr);
1690         else if (cr->bRequest == UAC2_CS_RANGE)
1691                 return in_rq_range(fn, cr);
1692         else
1693                 return -EOPNOTSUPP;
1694 }
1695
1696 static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
1697 {
1698         struct usb_function *fn = ep->driver_data;
1699         struct g_audio *agdev = func_to_g_audio(fn);
1700         struct f_uac2 *uac2 = func_to_uac2(fn);
1701         u32 val;
1702
1703         if (req->actual != 4)
1704                 return;
1705
1706         val = le32_to_cpu(*((__le32 *)req->buf));
1707         dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
1708         if (uac2->clock_id == USB_IN_CLK_ID) {
1709                 u_audio_set_playback_srate(agdev, val);
1710         } else if (uac2->clock_id == USB_OUT_CLK_ID) {
1711                 u_audio_set_capture_srate(agdev, val);
1712         }
1713 }
1714
1715 static void
1716 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1717 {
1718         struct g_audio *agdev = req->context;
1719         struct usb_composite_dev *cdev = agdev->func.config->cdev;
1720         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1721         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1722         struct usb_ctrlrequest *cr = &uac2->setup_cr;
1723         u16 w_index = le16_to_cpu(cr->wIndex);
1724         u16 w_value = le16_to_cpu(cr->wValue);
1725         u8 entity_id = (w_index >> 8) & 0xff;
1726         u8 control_selector = w_value >> 8;
1727
1728         if (req->status != 0) {
1729                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1730                 return;
1731         }
1732
1733         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1734                 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1735                 unsigned int is_playback = 0;
1736
1737                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1738                         is_playback = 1;
1739
1740                 if (control_selector == UAC_FU_MUTE) {
1741                         u8 mute = *(u8 *)req->buf;
1742
1743                         u_audio_set_mute(agdev, is_playback, mute);
1744
1745                         return;
1746                 } else if (control_selector == UAC_FU_VOLUME) {
1747                         struct cntrl_cur_lay2 *c = req->buf;
1748                         s16 volume;
1749
1750                         volume = le16_to_cpu(c->wCUR);
1751                         u_audio_set_volume(agdev, is_playback, volume);
1752
1753                         return;
1754                 } else {
1755                         dev_err(&agdev->gadget->dev,
1756                                 "%s:%d control_selector=%d TODO!\n",
1757                                 __func__, __LINE__, control_selector);
1758                         usb_ep_set_halt(ep);
1759                 }
1760         }
1761 }
1762
1763 static int
1764 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1765 {
1766         struct usb_composite_dev *cdev = fn->config->cdev;
1767         struct usb_request *req = fn->config->cdev->req;
1768         struct g_audio *agdev = func_to_g_audio(fn);
1769         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1770         struct f_uac2 *uac2 = func_to_uac2(fn);
1771         u16 w_length = le16_to_cpu(cr->wLength);
1772         u16 w_index = le16_to_cpu(cr->wIndex);
1773         u16 w_value = le16_to_cpu(cr->wValue);
1774         u8 entity_id = (w_index >> 8) & 0xff;
1775         u8 control_selector = w_value >> 8;
1776         u8 clock_id = w_index >> 8;
1777
1778         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1779                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1780                         dev_dbg(&agdev->gadget->dev,
1781                                 "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
1782                         cdev->gadget->ep0->driver_data = fn;
1783                         uac2->clock_id = clock_id;
1784                         req->complete = uac2_cs_control_sam_freq;
1785                         return w_length;
1786                 }
1787         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1788                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1789                 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1790                 req->context = agdev;
1791                 req->complete = out_rq_cur_complete;
1792
1793                 return w_length;
1794         } else {
1795                 dev_err(&agdev->gadget->dev,
1796                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1797                         __func__, __LINE__, entity_id, control_selector);
1798         }
1799         return -EOPNOTSUPP;
1800 }
1801
1802 static int
1803 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1804 {
1805         struct f_uac2 *uac2 = func_to_uac2(fn);
1806         struct g_audio *agdev = func_to_g_audio(fn);
1807         u16 w_index = le16_to_cpu(cr->wIndex);
1808         u8 intf = w_index & 0xff;
1809
1810         if (intf != uac2->ac_intf) {
1811                 dev_err(&agdev->gadget->dev,
1812                         "%s:%d Error!\n", __func__, __LINE__);
1813                 return -EOPNOTSUPP;
1814         }
1815
1816         if (cr->bRequestType & USB_DIR_IN)
1817                 return ac_rq_in(fn, cr);
1818         else if (cr->bRequest == UAC2_CS_CUR)
1819                 return out_rq_cur(fn, cr);
1820
1821         return -EOPNOTSUPP;
1822 }
1823
1824 static int
1825 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1826 {
1827         struct usb_composite_dev *cdev = fn->config->cdev;
1828         struct g_audio *agdev = func_to_g_audio(fn);
1829         struct usb_request *req = cdev->req;
1830         u16 w_length = le16_to_cpu(cr->wLength);
1831         int value = -EOPNOTSUPP;
1832
1833         /* Only Class specific requests are supposed to reach here */
1834         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1835                 return -EOPNOTSUPP;
1836
1837         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1838                 value = setup_rq_inf(fn, cr);
1839         else
1840                 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1841                                 __func__, __LINE__);
1842
1843         if (value >= 0) {
1844                 req->length = value;
1845                 req->zero = value < w_length;
1846                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1847                 if (value < 0) {
1848                         dev_err(&agdev->gadget->dev,
1849                                 "%s:%d Error!\n", __func__, __LINE__);
1850                         req->status = 0;
1851                 }
1852         }
1853
1854         return value;
1855 }
1856
1857 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1858 {
1859         return container_of(to_config_group(item), struct f_uac2_opts,
1860                             func_inst.group);
1861 }
1862
1863 static void f_uac2_attr_release(struct config_item *item)
1864 {
1865         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1866
1867         usb_put_function_instance(&opts->func_inst);
1868 }
1869
1870 static struct configfs_item_operations f_uac2_item_ops = {
1871         .release        = f_uac2_attr_release,
1872 };
1873
1874 #define uac2_kstrtou8 kstrtou8
1875 #define uac2_kstrtou32 kstrtou32
1876 #define uac2_kstrtos16 kstrtos16
1877 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1878
1879 static const char *u8_fmt = "%u\n";
1880 static const char *u32_fmt = "%u\n";
1881 static const char *s16_fmt = "%hd\n";
1882 static const char *bool_fmt = "%u\n";
1883
1884 #define UAC2_ATTRIBUTE(type, name)                                      \
1885 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1886                                          char *page)                    \
1887 {                                                                       \
1888         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1889         int result;                                                     \
1890                                                                         \
1891         mutex_lock(&opts->lock);                                        \
1892         result = sprintf(page, type##_fmt, opts->name);                 \
1893         mutex_unlock(&opts->lock);                                      \
1894                                                                         \
1895         return result;                                                  \
1896 }                                                                       \
1897                                                                         \
1898 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1899                                           const char *page, size_t len) \
1900 {                                                                       \
1901         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1902         int ret;                                                        \
1903         type num;                                                       \
1904                                                                         \
1905         mutex_lock(&opts->lock);                                        \
1906         if (opts->refcnt) {                                             \
1907                 ret = -EBUSY;                                           \
1908                 goto end;                                               \
1909         }                                                               \
1910                                                                         \
1911         ret = uac2_kstrto##type(page, 0, &num);                         \
1912         if (ret)                                                        \
1913                 goto end;                                               \
1914                                                                         \
1915         opts->name = num;                                               \
1916         ret = len;                                                      \
1917                                                                         \
1918 end:                                                                    \
1919         mutex_unlock(&opts->lock);                                      \
1920         return ret;                                                     \
1921 }                                                                       \
1922                                                                         \
1923 CONFIGFS_ATTR(f_uac2_opts_, name)
1924
1925 #define UAC2_ATTRIBUTE_SYNC(name)                                       \
1926 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1927                                          char *page)                    \
1928 {                                                                       \
1929         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1930         int result;                                                     \
1931         char *str;                                                      \
1932                                                                         \
1933         mutex_lock(&opts->lock);                                        \
1934         switch (opts->name) {                                           \
1935         case USB_ENDPOINT_SYNC_ASYNC:                                   \
1936                 str = "async";                                          \
1937                 break;                                                  \
1938         case USB_ENDPOINT_SYNC_ADAPTIVE:                                \
1939                 str = "adaptive";                                       \
1940                 break;                                                  \
1941         default:                                                        \
1942                 str = "unknown";                                        \
1943                 break;                                                  \
1944         }                                                               \
1945         result = sprintf(page, "%s\n", str);                            \
1946         mutex_unlock(&opts->lock);                                      \
1947                                                                         \
1948         return result;                                                  \
1949 }                                                                       \
1950                                                                         \
1951 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1952                                           const char *page, size_t len) \
1953 {                                                                       \
1954         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1955         int ret = 0;                                                    \
1956                                                                         \
1957         mutex_lock(&opts->lock);                                        \
1958         if (opts->refcnt) {                                             \
1959                 ret = -EBUSY;                                           \
1960                 goto end;                                               \
1961         }                                                               \
1962                                                                         \
1963         if (!strncmp(page, "async", 5))                                 \
1964                 opts->name = USB_ENDPOINT_SYNC_ASYNC;                   \
1965         else if (!strncmp(page, "adaptive", 8))                         \
1966                 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE;                \
1967         else {                                                          \
1968                 ret = -EINVAL;                                          \
1969                 goto end;                                               \
1970         }                                                               \
1971                                                                         \
1972         ret = len;                                                      \
1973                                                                         \
1974 end:                                                                    \
1975         mutex_unlock(&opts->lock);                                      \
1976         return ret;                                                     \
1977 }                                                                       \
1978                                                                         \
1979 CONFIGFS_ATTR(f_uac2_opts_, name)
1980
1981 #define UAC2_RATE_ATTRIBUTE(name)                                       \
1982 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1983                                          char *page)                    \
1984 {                                                                       \
1985         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1986         int result = 0;                                                 \
1987         int i;                                                          \
1988                                                                         \
1989         mutex_lock(&opts->lock);                                        \
1990         page[0] = '\0';                                                 \
1991         for (i = 0; i < UAC_MAX_RATES; i++) {                           \
1992                 if (opts->name##s[i] == 0)                              \
1993                         break;                                          \
1994                 result += sprintf(page + strlen(page), "%u,",           \
1995                                 opts->name##s[i]);                      \
1996         }                                                               \
1997         if (strlen(page) > 0)                                           \
1998                 page[strlen(page) - 1] = '\n';                          \
1999         mutex_unlock(&opts->lock);                                      \
2000                                                                         \
2001         return result;                                                  \
2002 }                                                                       \
2003                                                                         \
2004 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
2005                                           const char *page, size_t len) \
2006 {                                                                       \
2007         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2008         char *split_page = NULL;                                        \
2009         int ret = -EINVAL;                                              \
2010         char *token;                                                    \
2011         u32 num;                                                        \
2012         int i;                                                          \
2013                                                                         \
2014         mutex_lock(&opts->lock);                                        \
2015         if (opts->refcnt) {                                             \
2016                 ret = -EBUSY;                                           \
2017                 goto end;                                               \
2018         }                                                               \
2019                                                                         \
2020         i = 0;                                                          \
2021         memset(opts->name##s, 0x00, sizeof(opts->name##s));             \
2022         split_page = kstrdup(page, GFP_KERNEL);                         \
2023         while ((token = strsep(&split_page, ",")) != NULL) {            \
2024                 ret = kstrtou32(token, 0, &num);                        \
2025                 if (ret)                                                \
2026                         goto end;                                       \
2027                                                                         \
2028                 opts->name##s[i++] = num;                               \
2029                 ret = len;                                              \
2030         };                                                              \
2031                                                                         \
2032 end:                                                                    \
2033         kfree(split_page);                                              \
2034         mutex_unlock(&opts->lock);                                      \
2035         return ret;                                                     \
2036 }                                                                       \
2037                                                                         \
2038 CONFIGFS_ATTR(f_uac2_opts_, name)
2039
2040 #define UAC2_ATTRIBUTE_STRING(name)                                     \
2041 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
2042                                          char *page)                    \
2043 {                                                                       \
2044         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2045         int result;                                                     \
2046                                                                         \
2047         mutex_lock(&opts->lock);                                        \
2048         result = snprintf(page, sizeof(opts->name), "%s", opts->name);  \
2049         mutex_unlock(&opts->lock);                                      \
2050                                                                         \
2051         return result;                                                  \
2052 }                                                                       \
2053                                                                         \
2054 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
2055                                           const char *page, size_t len) \
2056 {                                                                       \
2057         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2058         int ret = 0;                                                    \
2059                                                                         \
2060         mutex_lock(&opts->lock);                                        \
2061         if (opts->refcnt) {                                             \
2062                 ret = -EBUSY;                                           \
2063                 goto end;                                               \
2064         }                                                               \
2065                                                                         \
2066         ret = snprintf(opts->name, min(sizeof(opts->name), len),        \
2067                         "%s", page);                                    \
2068                                                                         \
2069 end:                                                                    \
2070         mutex_unlock(&opts->lock);                                      \
2071         return ret;                                                     \
2072 }                                                                       \
2073                                                                         \
2074 CONFIGFS_ATTR(f_uac2_opts_, name)
2075
2076 UAC2_ATTRIBUTE(u32, p_chmask);
2077 UAC2_RATE_ATTRIBUTE(p_srate);
2078 UAC2_ATTRIBUTE(u32, p_ssize);
2079 UAC2_ATTRIBUTE(u8, p_hs_bint);
2080 UAC2_ATTRIBUTE(u32, c_chmask);
2081 UAC2_RATE_ATTRIBUTE(c_srate);
2082 UAC2_ATTRIBUTE_SYNC(c_sync);
2083 UAC2_ATTRIBUTE(u32, c_ssize);
2084 UAC2_ATTRIBUTE(u8, c_hs_bint);
2085 UAC2_ATTRIBUTE(u32, req_number);
2086
2087 UAC2_ATTRIBUTE(bool, p_mute_present);
2088 UAC2_ATTRIBUTE(bool, p_volume_present);
2089 UAC2_ATTRIBUTE(s16, p_volume_min);
2090 UAC2_ATTRIBUTE(s16, p_volume_max);
2091 UAC2_ATTRIBUTE(s16, p_volume_res);
2092
2093 UAC2_ATTRIBUTE(bool, c_mute_present);
2094 UAC2_ATTRIBUTE(bool, c_volume_present);
2095 UAC2_ATTRIBUTE(s16, c_volume_min);
2096 UAC2_ATTRIBUTE(s16, c_volume_max);
2097 UAC2_ATTRIBUTE(s16, c_volume_res);
2098 UAC2_ATTRIBUTE(u32, fb_max);
2099 UAC2_ATTRIBUTE_STRING(function_name);
2100
2101 UAC2_ATTRIBUTE(s16, p_terminal_type);
2102 UAC2_ATTRIBUTE(s16, c_terminal_type);
2103
2104 static struct configfs_attribute *f_uac2_attrs[] = {
2105         &f_uac2_opts_attr_p_chmask,
2106         &f_uac2_opts_attr_p_srate,
2107         &f_uac2_opts_attr_p_ssize,
2108         &f_uac2_opts_attr_p_hs_bint,
2109         &f_uac2_opts_attr_c_chmask,
2110         &f_uac2_opts_attr_c_srate,
2111         &f_uac2_opts_attr_c_ssize,
2112         &f_uac2_opts_attr_c_hs_bint,
2113         &f_uac2_opts_attr_c_sync,
2114         &f_uac2_opts_attr_req_number,
2115         &f_uac2_opts_attr_fb_max,
2116
2117         &f_uac2_opts_attr_p_mute_present,
2118         &f_uac2_opts_attr_p_volume_present,
2119         &f_uac2_opts_attr_p_volume_min,
2120         &f_uac2_opts_attr_p_volume_max,
2121         &f_uac2_opts_attr_p_volume_res,
2122
2123         &f_uac2_opts_attr_c_mute_present,
2124         &f_uac2_opts_attr_c_volume_present,
2125         &f_uac2_opts_attr_c_volume_min,
2126         &f_uac2_opts_attr_c_volume_max,
2127         &f_uac2_opts_attr_c_volume_res,
2128
2129         &f_uac2_opts_attr_function_name,
2130
2131         &f_uac2_opts_attr_p_terminal_type,
2132         &f_uac2_opts_attr_c_terminal_type,
2133
2134         NULL,
2135 };
2136
2137 static const struct config_item_type f_uac2_func_type = {
2138         .ct_item_ops    = &f_uac2_item_ops,
2139         .ct_attrs       = f_uac2_attrs,
2140         .ct_owner       = THIS_MODULE,
2141 };
2142
2143 static void afunc_free_inst(struct usb_function_instance *f)
2144 {
2145         struct f_uac2_opts *opts;
2146
2147         opts = container_of(f, struct f_uac2_opts, func_inst);
2148         kfree(opts);
2149 }
2150
2151 static struct usb_function_instance *afunc_alloc_inst(void)
2152 {
2153         struct f_uac2_opts *opts;
2154
2155         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2156         if (!opts)
2157                 return ERR_PTR(-ENOMEM);
2158
2159         mutex_init(&opts->lock);
2160         opts->func_inst.free_func_inst = afunc_free_inst;
2161
2162         config_group_init_type_name(&opts->func_inst.group, "",
2163                                     &f_uac2_func_type);
2164
2165         opts->p_chmask = UAC2_DEF_PCHMASK;
2166         opts->p_srates[0] = UAC2_DEF_PSRATE;
2167         opts->p_ssize = UAC2_DEF_PSSIZE;
2168         opts->p_hs_bint = UAC2_DEF_PHSBINT;
2169         opts->c_chmask = UAC2_DEF_CCHMASK;
2170         opts->c_srates[0] = UAC2_DEF_CSRATE;
2171         opts->c_ssize = UAC2_DEF_CSSIZE;
2172         opts->c_hs_bint = UAC2_DEF_CHSBINT;
2173         opts->c_sync = UAC2_DEF_CSYNC;
2174
2175         opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
2176         opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
2177         opts->p_volume_min = UAC2_DEF_MIN_DB;
2178         opts->p_volume_max = UAC2_DEF_MAX_DB;
2179         opts->p_volume_res = UAC2_DEF_RES_DB;
2180
2181         opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
2182         opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
2183         opts->c_volume_min = UAC2_DEF_MIN_DB;
2184         opts->c_volume_max = UAC2_DEF_MAX_DB;
2185         opts->c_volume_res = UAC2_DEF_RES_DB;
2186
2187         opts->req_number = UAC2_DEF_REQ_NUM;
2188         opts->fb_max = FBACK_FAST_MAX;
2189
2190         snprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
2191
2192         opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE;
2193         opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE;
2194
2195         return &opts->func_inst;
2196 }
2197
2198 static void afunc_free(struct usb_function *f)
2199 {
2200         struct g_audio *agdev;
2201         struct f_uac2_opts *opts;
2202
2203         agdev = func_to_g_audio(f);
2204         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
2205         kfree(agdev);
2206         mutex_lock(&opts->lock);
2207         --opts->refcnt;
2208         mutex_unlock(&opts->lock);
2209 }
2210
2211 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
2212 {
2213         struct g_audio *agdev = func_to_g_audio(f);
2214
2215         g_audio_cleanup(agdev);
2216         usb_free_all_descriptors(f);
2217
2218         agdev->gadget = NULL;
2219
2220         kfree(out_feature_unit_desc);
2221         out_feature_unit_desc = NULL;
2222         kfree(in_feature_unit_desc);
2223         in_feature_unit_desc = NULL;
2224 }
2225
2226 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
2227 {
2228         struct f_uac2   *uac2;
2229         struct f_uac2_opts *opts;
2230
2231         uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
2232         if (uac2 == NULL)
2233                 return ERR_PTR(-ENOMEM);
2234
2235         opts = container_of(fi, struct f_uac2_opts, func_inst);
2236         mutex_lock(&opts->lock);
2237         ++opts->refcnt;
2238         mutex_unlock(&opts->lock);
2239
2240         uac2->g_audio.func.name = "uac2_func";
2241         uac2->g_audio.func.bind = afunc_bind;
2242         uac2->g_audio.func.unbind = afunc_unbind;
2243         uac2->g_audio.func.set_alt = afunc_set_alt;
2244         uac2->g_audio.func.get_alt = afunc_get_alt;
2245         uac2->g_audio.func.disable = afunc_disable;
2246         uac2->g_audio.func.suspend = afunc_suspend;
2247         uac2->g_audio.func.setup = afunc_setup;
2248         uac2->g_audio.func.free_func = afunc_free;
2249
2250         return &uac2->g_audio.func;
2251 }
2252
2253 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
2254 MODULE_LICENSE("GPL");
2255 MODULE_AUTHOR("Yadwinder Singh");
2256 MODULE_AUTHOR("Jaswinder Singh");
2257 MODULE_AUTHOR("Ruslan Bilovol");