drivers/usb/gadget/function/f_uac2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * f_uac2.c -- USB Audio Class 2.0 Function
   4  *
   5  * Copyright (C) 2011
   6  *    Yadwinder Singh (yadi.brar01@gmail.com)
   7  *    Jaswinder Singh (jaswinder.singh@linaro.org)
   8  *
   9  * Copyright (C) 2020
  10  *    Ruslan Bilovol (ruslan.bilovol@gmail.com)
  11  */
  12
  13 #include <linux/usb/audio.h>
  14 #include <linux/usb/audio-v2.h>
  15 #include <linux/module.h>
  16
  17 #include "u_audio.h"
  18 #include "u_uac2.h"
  19
  20 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
  21 #define UAC2_CHANNEL_MASK 0x07FFFFFF
  22
  23 /*
  24  * The driver implements a simple UAC_2 topology.
  25  * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
  26  * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
  27  * Capture and Playback sampling rates are independently
  28  *  controlled by two clock sources :
  29  *    CLK_5 := c_srate, and CLK_6 := p_srate
  30  */
  31 #define USB_OUT_CLK_ID  (out_clk_src_desc.bClockID)
  32 #define USB_IN_CLK_ID   (in_clk_src_desc.bClockID)
  33 #define USB_OUT_FU_ID   (out_feature_unit_desc->bUnitID)
  34 #define USB_IN_FU_ID    (in_feature_unit_desc->bUnitID)
  35
  36 #define CONTROL_ABSENT  0
  37 #define CONTROL_RDONLY  1
  38 #define CONTROL_RDWR    3
  39
  40 #define CLK_FREQ_CTRL   0
  41 #define CLK_VLD_CTRL    2
  42 #define FU_MUTE_CTRL    0
  43 #define FU_VOL_CTRL     2
  44
  45 #define COPY_CTRL       0
  46 #define CONN_CTRL       2
  47 #define OVRLD_CTRL      4
  48 #define CLSTR_CTRL      6
  49 #define UNFLW_CTRL      8
  50 #define OVFLW_CTRL      10
  51
  52 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
  53 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
  54 #define FUIN_EN(_opts) (EPIN_EN(_opts) \
  55                                 && ((_opts)->p_mute_present \
  56                                 || (_opts)->p_volume_present))
  57 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
  58                                 && ((_opts)->c_mute_present \
  59                                 || (_opts)->c_volume_present))
  60 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
  61
  62 struct f_uac2 {
  63         struct g_audio g_audio;
  64         u8 ac_intf, as_in_intf, as_out_intf;
  65         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  66
  67         struct usb_ctrlrequest setup_cr;        /* will be used in data stage */
  68
  69         /* Interrupt IN endpoint of AC interface */
  70         struct usb_ep   *int_ep;
  71         atomic_t        int_count;
  72 };
  73
  74 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
  75 {
  76         return container_of(f, struct f_uac2, g_audio.func);
  77 }
  78
  79 static inline
  80 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
  81 {
  82         return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
  83 }
  84
  85 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
  86
  87 /* --------- USB Function Interface ------------- */
  88
  89 enum {
  90         STR_ASSOC,
  91         STR_IF_CTRL,
  92         STR_CLKSRC_IN,
  93         STR_CLKSRC_OUT,
  94         STR_USB_IT,
  95         STR_IO_IT,
  96         STR_USB_OT,
  97         STR_IO_OT,
  98         STR_FU_IN,
  99         STR_FU_OUT,
 100         STR_AS_OUT_ALT0,
 101         STR_AS_OUT_ALT1,
 102         STR_AS_IN_ALT0,
 103         STR_AS_IN_ALT1,
 104 };
 105
 106 static char clksrc_in[8];
 107 static char clksrc_out[8];
 108
 109 static struct usb_string strings_fn[] = {
 110         [STR_ASSOC].s = "Source/Sink",
 111         [STR_IF_CTRL].s = "Topology Control",
 112         [STR_CLKSRC_IN].s = clksrc_in,
 113         [STR_CLKSRC_OUT].s = clksrc_out,
 114         [STR_USB_IT].s = "USBH Out",
 115         [STR_IO_IT].s = "USBD Out",
 116         [STR_USB_OT].s = "USBH In",
 117         [STR_IO_OT].s = "USBD In",
 118         [STR_FU_IN].s = "Capture Volume",
 119         [STR_FU_OUT].s = "Playback Volume",
 120         [STR_AS_OUT_ALT0].s = "Playback Inactive",
 121         [STR_AS_OUT_ALT1].s = "Playback Active",
 122         [STR_AS_IN_ALT0].s = "Capture Inactive",
 123         [STR_AS_IN_ALT1].s = "Capture Active",
 124         { },
 125 };
 126
 127 static struct usb_gadget_strings str_fn = {
 128         .language = 0x0409,     /* en-us */
 129         .strings = strings_fn,
 130 };
 131
 132 static struct usb_gadget_strings *fn_strings[] = {
 133         &str_fn,
 134         NULL,
 135 };
 136
 137 static struct usb_interface_assoc_descriptor iad_desc = {
 138         .bLength = sizeof iad_desc,
 139         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 140
 141         .bFirstInterface = 0,
 142         .bInterfaceCount = 3,
 143         .bFunctionClass = USB_CLASS_AUDIO,
 144         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 145         .bFunctionProtocol = UAC_VERSION_2,
 146 };
 147
 148 /* Audio Control Interface */
 149 static struct usb_interface_descriptor std_ac_if_desc = {
 150         .bLength = sizeof std_ac_if_desc,
 151         .bDescriptorType = USB_DT_INTERFACE,
 152
 153         .bAlternateSetting = 0,
 154         /* .bNumEndpoints = DYNAMIC */
 155         .bInterfaceClass = USB_CLASS_AUDIO,
 156         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 157         .bInterfaceProtocol = UAC_VERSION_2,
 158 };
 159
 160 /* Clock source for IN traffic */
 161 static struct uac_clock_source_descriptor in_clk_src_desc = {
 162         .bLength = sizeof in_clk_src_desc,
 163         .bDescriptorType = USB_DT_CS_INTERFACE,
 164
 165         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 166         /* .bClockID = DYNAMIC */
 167         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 168         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 169         .bAssocTerminal = 0,
 170 };
 171
 172 /* Clock source for OUT traffic */
 173 static struct uac_clock_source_descriptor out_clk_src_desc = {
 174         .bLength = sizeof out_clk_src_desc,
 175         .bDescriptorType = USB_DT_CS_INTERFACE,
 176
 177         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 178         /* .bClockID = DYNAMIC */
 179         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 180         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 181         .bAssocTerminal = 0,
 182 };
 183
 184 /* Input Terminal for USB_OUT */
 185 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
 186         .bLength = sizeof usb_out_it_desc,
 187         .bDescriptorType = USB_DT_CS_INTERFACE,
 188
 189         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 190         /* .bTerminalID = DYNAMIC */
 191         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 192         .bAssocTerminal = 0,
 193         /* .bCSourceID = DYNAMIC */
 194         .iChannelNames = 0,
 195         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 196 };
 197
 198 /* Input Terminal for I/O-In */
 199 static struct uac2_input_terminal_descriptor io_in_it_desc = {
 200         .bLength = sizeof io_in_it_desc,
 201         .bDescriptorType = USB_DT_CS_INTERFACE,
 202
 203         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 204         /* .bTerminalID = DYNAMIC */
 205         .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
 206         .bAssocTerminal = 0,
 207         /* .bCSourceID = DYNAMIC */
 208         .iChannelNames = 0,
 209         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 210 };
 211
 212 /* Ouput Terminal for USB_IN */
 213 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 214         .bLength = sizeof usb_in_ot_desc,
 215         .bDescriptorType = USB_DT_CS_INTERFACE,
 216
 217         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 218         /* .bTerminalID = DYNAMIC */
 219         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 220         .bAssocTerminal = 0,
 221         /* .bSourceID = DYNAMIC */
 222         /* .bCSourceID = DYNAMIC */
 223         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 224 };
 225
 226 /* Ouput Terminal for I/O-Out */
 227 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
 228         .bLength = sizeof io_out_ot_desc,
 229         .bDescriptorType = USB_DT_CS_INTERFACE,
 230
 231         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 232         /* .bTerminalID = DYNAMIC */
 233         .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
 234         .bAssocTerminal = 0,
 235         /* .bSourceID = DYNAMIC */
 236         /* .bCSourceID = DYNAMIC */
 237         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 238 };
 239
 240 static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
 241 static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
 242
 243 static struct uac2_ac_header_descriptor ac_hdr_desc = {
 244         .bLength = sizeof ac_hdr_desc,
 245         .bDescriptorType = USB_DT_CS_INTERFACE,
 246
 247         .bDescriptorSubtype = UAC_MS_HEADER,
 248         .bcdADC = cpu_to_le16(0x200),
 249         .bCategory = UAC2_FUNCTION_IO_BOX,
 250         /* .wTotalLength = DYNAMIC */
 251         .bmControls = 0,
 252 };
 253
 254 /* AC IN Interrupt Endpoint */
 255 static struct usb_endpoint_descriptor fs_ep_int_desc = {
 256         .bLength = USB_DT_ENDPOINT_SIZE,
 257         .bDescriptorType = USB_DT_ENDPOINT,
 258
 259         .bEndpointAddress = USB_DIR_IN,
 260         .bmAttributes = USB_ENDPOINT_XFER_INT,
 261         .wMaxPacketSize = cpu_to_le16(6),
 262         .bInterval = 1,
 263 };
 264
 265 static struct usb_endpoint_descriptor hs_ep_int_desc = {
 266         .bLength = USB_DT_ENDPOINT_SIZE,
 267         .bDescriptorType = USB_DT_ENDPOINT,
 268
 269         .bmAttributes = USB_ENDPOINT_XFER_INT,
 270         .wMaxPacketSize = cpu_to_le16(6),
 271         .bInterval = 4,
 272 };
 273
 274 static struct usb_endpoint_descriptor ss_ep_int_desc = {
 275         .bLength = USB_DT_ENDPOINT_SIZE,
 276         .bDescriptorType = USB_DT_ENDPOINT,
 277
 278         .bEndpointAddress = USB_DIR_IN,
 279         .bmAttributes = USB_ENDPOINT_XFER_INT,
 280         .wMaxPacketSize = cpu_to_le16(6),
 281         .bInterval = 4,
 282 };
 283
 284 /* Audio Streaming OUT Interface - Alt0 */
 285 static struct usb_interface_descriptor std_as_out_if0_desc = {
 286         .bLength = sizeof std_as_out_if0_desc,
 287         .bDescriptorType = USB_DT_INTERFACE,
 288
 289         .bAlternateSetting = 0,
 290         .bNumEndpoints = 0,
 291         .bInterfaceClass = USB_CLASS_AUDIO,
 292         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 293         .bInterfaceProtocol = UAC_VERSION_2,
 294 };
 295
 296 /* Audio Streaming OUT Interface - Alt1 */
 297 static struct usb_interface_descriptor std_as_out_if1_desc = {
 298         .bLength = sizeof std_as_out_if1_desc,
 299         .bDescriptorType = USB_DT_INTERFACE,
 300
 301         .bAlternateSetting = 1,
 302         .bNumEndpoints = 1,
 303         .bInterfaceClass = USB_CLASS_AUDIO,
 304         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 305         .bInterfaceProtocol = UAC_VERSION_2,
 306 };
 307
 308 /* Audio Stream OUT Intface Desc */
 309 static struct uac2_as_header_descriptor as_out_hdr_desc = {
 310         .bLength = sizeof as_out_hdr_desc,
 311         .bDescriptorType = USB_DT_CS_INTERFACE,
 312
 313         .bDescriptorSubtype = UAC_AS_GENERAL,
 314         /* .bTerminalLink = DYNAMIC */
 315         .bmControls = 0,
 316         .bFormatType = UAC_FORMAT_TYPE_I,
 317         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 318         .iChannelNames = 0,
 319 };
 320
 321 /* Audio USB_OUT Format */
 322 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 323         .bLength = sizeof as_out_fmt1_desc,
 324         .bDescriptorType = USB_DT_CS_INTERFACE,
 325         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 326         .bFormatType = UAC_FORMAT_TYPE_I,
 327 };
 328
 329 /* STD AS ISO OUT Endpoint */
 330 static struct usb_endpoint_descriptor fs_epout_desc = {
 331         .bLength = USB_DT_ENDPOINT_SIZE,
 332         .bDescriptorType = USB_DT_ENDPOINT,
 333
 334         .bEndpointAddress = USB_DIR_OUT,
 335         /* .bmAttributes = DYNAMIC */
 336         /* .wMaxPacketSize = DYNAMIC */
 337         .bInterval = 1,
 338 };
 339
 340 static struct usb_endpoint_descriptor hs_epout_desc = {
 341         .bLength = USB_DT_ENDPOINT_SIZE,
 342         .bDescriptorType = USB_DT_ENDPOINT,
 343
 344         /* .bmAttributes = DYNAMIC */
 345         /* .wMaxPacketSize = DYNAMIC */
 346         .bInterval = 4,
 347 };
 348
 349 static struct usb_endpoint_descriptor ss_epout_desc = {
 350         .bLength = USB_DT_ENDPOINT_SIZE,
 351         .bDescriptorType = USB_DT_ENDPOINT,
 352
 353         .bEndpointAddress = USB_DIR_OUT,
 354         /* .bmAttributes = DYNAMIC */
 355         /* .wMaxPacketSize = DYNAMIC */
 356         .bInterval = 4,
 357 };
 358
 359 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
 360         .bLength                = sizeof(ss_epout_desc_comp),
 361         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 362         .bMaxBurst              = 0,
 363         .bmAttributes           = 0,
 364         /* wBytesPerInterval = DYNAMIC */
 365 };
 366
 367 /* CS AS ISO OUT Endpoint */
 368 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 369         .bLength = sizeof as_iso_out_desc,
 370         .bDescriptorType = USB_DT_CS_ENDPOINT,
 371
 372         .bDescriptorSubtype = UAC_EP_GENERAL,
 373         .bmAttributes = 0,
 374         .bmControls = 0,
 375         .bLockDelayUnits = 0,
 376         .wLockDelay = 0,
 377 };
 378
 379 /* STD AS ISO IN Feedback Endpoint */
 380 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
 381         .bLength = USB_DT_ENDPOINT_SIZE,
 382         .bDescriptorType = USB_DT_ENDPOINT,
 383
 384         .bEndpointAddress = USB_DIR_IN,
 385         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 386         .wMaxPacketSize = cpu_to_le16(3),
 387         .bInterval = 1,
 388 };
 389
 390 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
 391         .bLength = USB_DT_ENDPOINT_SIZE,
 392         .bDescriptorType = USB_DT_ENDPOINT,
 393
 394         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 395         .wMaxPacketSize = cpu_to_le16(4),
 396         .bInterval = 4,
 397 };
 398
 399 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
 400         .bLength = USB_DT_ENDPOINT_SIZE,
 401         .bDescriptorType = USB_DT_ENDPOINT,
 402
 403         .bEndpointAddress = USB_DIR_IN,
 404         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 405         .wMaxPacketSize = cpu_to_le16(4),
 406         .bInterval = 4,
 407 };
 408
 409 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
 410         .bLength                = sizeof(ss_epin_fback_desc_comp),
 411         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 412         .bMaxBurst              = 0,
 413         .bmAttributes           = 0,
 414         .wBytesPerInterval      = cpu_to_le16(4),
 415 };
 416
 417
 418 /* Audio Streaming IN Interface - Alt0 */
 419 static struct usb_interface_descriptor std_as_in_if0_desc = {
 420         .bLength = sizeof std_as_in_if0_desc,
 421         .bDescriptorType = USB_DT_INTERFACE,
 422
 423         .bAlternateSetting = 0,
 424         .bNumEndpoints = 0,
 425         .bInterfaceClass = USB_CLASS_AUDIO,
 426         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 427         .bInterfaceProtocol = UAC_VERSION_2,
 428 };
 429
 430 /* Audio Streaming IN Interface - Alt1 */
 431 static struct usb_interface_descriptor std_as_in_if1_desc = {
 432         .bLength = sizeof std_as_in_if1_desc,
 433         .bDescriptorType = USB_DT_INTERFACE,
 434
 435         .bAlternateSetting = 1,
 436         .bNumEndpoints = 1,
 437         .bInterfaceClass = USB_CLASS_AUDIO,
 438         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 439         .bInterfaceProtocol = UAC_VERSION_2,
 440 };
 441
 442 /* Audio Stream IN Intface Desc */
 443 static struct uac2_as_header_descriptor as_in_hdr_desc = {
 444         .bLength = sizeof as_in_hdr_desc,
 445         .bDescriptorType = USB_DT_CS_INTERFACE,
 446
 447         .bDescriptorSubtype = UAC_AS_GENERAL,
 448         /* .bTerminalLink = DYNAMIC */
 449         .bmControls = 0,
 450         .bFormatType = UAC_FORMAT_TYPE_I,
 451         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 452         .iChannelNames = 0,
 453 };
 454
 455 /* Audio USB_IN Format */
 456 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 457         .bLength = sizeof as_in_fmt1_desc,
 458         .bDescriptorType = USB_DT_CS_INTERFACE,
 459         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 460         .bFormatType = UAC_FORMAT_TYPE_I,
 461 };
 462
 463 /* STD AS ISO IN Endpoint */
 464 static struct usb_endpoint_descriptor fs_epin_desc = {
 465         .bLength = USB_DT_ENDPOINT_SIZE,
 466         .bDescriptorType = USB_DT_ENDPOINT,
 467
 468         .bEndpointAddress = USB_DIR_IN,
 469         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 470         /* .wMaxPacketSize = DYNAMIC */
 471         .bInterval = 1,
 472 };
 473
 474 static struct usb_endpoint_descriptor hs_epin_desc = {
 475         .bLength = USB_DT_ENDPOINT_SIZE,
 476         .bDescriptorType = USB_DT_ENDPOINT,
 477
 478         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 479         /* .wMaxPacketSize = DYNAMIC */
 480         .bInterval = 4,
 481 };
 482
 483 static struct usb_endpoint_descriptor ss_epin_desc = {
 484         .bLength = USB_DT_ENDPOINT_SIZE,
 485         .bDescriptorType = USB_DT_ENDPOINT,
 486
 487         .bEndpointAddress = USB_DIR_IN,
 488         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 489         /* .wMaxPacketSize = DYNAMIC */
 490         .bInterval = 4,
 491 };
 492
 493 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
 494         .bLength                = sizeof(ss_epin_desc_comp),
 495         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 496         .bMaxBurst              = 0,
 497         .bmAttributes           = 0,
 498         /* wBytesPerInterval = DYNAMIC */
 499 };
 500
 501 /* CS AS ISO IN Endpoint */
 502 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 503         .bLength = sizeof as_iso_in_desc,
 504         .bDescriptorType = USB_DT_CS_ENDPOINT,
 505
 506         .bDescriptorSubtype = UAC_EP_GENERAL,
 507         .bmAttributes = 0,
 508         .bmControls = 0,
 509         .bLockDelayUnits = 0,
 510         .wLockDelay = 0,
 511 };
 512
 513 static struct usb_descriptor_header *fs_audio_desc[] = {
 514         (struct usb_descriptor_header *)&iad_desc,
 515         (struct usb_descriptor_header *)&std_ac_if_desc,
 516
 517         (struct usb_descriptor_header *)&ac_hdr_desc,
 518         (struct usb_descriptor_header *)&in_clk_src_desc,
 519         (struct usb_descriptor_header *)&out_clk_src_desc,
 520         (struct usb_descriptor_header *)&usb_out_it_desc,
 521         (struct usb_descriptor_header *)&out_feature_unit_desc,
 522         (struct usb_descriptor_header *)&io_in_it_desc,
 523         (struct usb_descriptor_header *)&usb_in_ot_desc,
 524         (struct usb_descriptor_header *)&in_feature_unit_desc,
 525         (struct usb_descriptor_header *)&io_out_ot_desc,
 526
 527         (struct usb_descriptor_header *)&fs_ep_int_desc,
 528
 529         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 530         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 531
 532         (struct usb_descriptor_header *)&as_out_hdr_desc,
 533         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 534         (struct usb_descriptor_header *)&fs_epout_desc,
 535         (struct usb_descriptor_header *)&as_iso_out_desc,
 536         (struct usb_descriptor_header *)&fs_epin_fback_desc,
 537
 538         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 539         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 540
 541         (struct usb_descriptor_header *)&as_in_hdr_desc,
 542         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 543         (struct usb_descriptor_header *)&fs_epin_desc,
 544         (struct usb_descriptor_header *)&as_iso_in_desc,
 545         NULL,
 546 };
 547
 548 static struct usb_descriptor_header *hs_audio_desc[] = {
 549         (struct usb_descriptor_header *)&iad_desc,
 550         (struct usb_descriptor_header *)&std_ac_if_desc,
 551
 552         (struct usb_descriptor_header *)&ac_hdr_desc,
 553         (struct usb_descriptor_header *)&in_clk_src_desc,
 554         (struct usb_descriptor_header *)&out_clk_src_desc,
 555         (struct usb_descriptor_header *)&usb_out_it_desc,
 556         (struct usb_descriptor_header *)&out_feature_unit_desc,
 557         (struct usb_descriptor_header *)&io_in_it_desc,
 558         (struct usb_descriptor_header *)&usb_in_ot_desc,
 559         (struct usb_descriptor_header *)&in_feature_unit_desc,
 560         (struct usb_descriptor_header *)&io_out_ot_desc,
 561
 562         (struct usb_descriptor_header *)&hs_ep_int_desc,
 563
 564         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 565         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 566
 567         (struct usb_descriptor_header *)&as_out_hdr_desc,
 568         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 569         (struct usb_descriptor_header *)&hs_epout_desc,
 570         (struct usb_descriptor_header *)&as_iso_out_desc,
 571         (struct usb_descriptor_header *)&hs_epin_fback_desc,
 572
 573         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 574         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 575
 576         (struct usb_descriptor_header *)&as_in_hdr_desc,
 577         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 578         (struct usb_descriptor_header *)&hs_epin_desc,
 579         (struct usb_descriptor_header *)&as_iso_in_desc,
 580         NULL,
 581 };
 582
 583 static struct usb_descriptor_header *ss_audio_desc[] = {
 584         (struct usb_descriptor_header *)&iad_desc,
 585         (struct usb_descriptor_header *)&std_ac_if_desc,
 586
 587         (struct usb_descriptor_header *)&ac_hdr_desc,
 588         (struct usb_descriptor_header *)&in_clk_src_desc,
 589         (struct usb_descriptor_header *)&out_clk_src_desc,
 590         (struct usb_descriptor_header *)&usb_out_it_desc,
 591   (struct usb_descriptor_header *)&out_feature_unit_desc,
 592         (struct usb_descriptor_header *)&io_in_it_desc,
 593         (struct usb_descriptor_header *)&usb_in_ot_desc,
 594         (struct usb_descriptor_header *)&in_feature_unit_desc,
 595         (struct usb_descriptor_header *)&io_out_ot_desc,
 596
 597   (struct usb_descriptor_header *)&ss_ep_int_desc,
 598
 599         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 600         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 601
 602         (struct usb_descriptor_header *)&as_out_hdr_desc,
 603         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 604         (struct usb_descriptor_header *)&ss_epout_desc,
 605         (struct usb_descriptor_header *)&ss_epout_desc_comp,
 606         (struct usb_descriptor_header *)&as_iso_out_desc,
 607         (struct usb_descriptor_header *)&ss_epin_fback_desc,
 608         (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
 609
 610         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 611         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 612
 613         (struct usb_descriptor_header *)&as_in_hdr_desc,
 614         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 615         (struct usb_descriptor_header *)&ss_epin_desc,
 616         (struct usb_descriptor_header *)&ss_epin_desc_comp,
 617         (struct usb_descriptor_header *)&as_iso_in_desc,
 618         NULL,
 619 };
 620
 621 struct cntrl_cur_lay2 {
 622         __le16  wCUR;
 623 };
 624
 625 struct cntrl_range_lay2 {
 626         __le16  wNumSubRanges;
 627         __le16  wMIN;
 628         __le16  wMAX;
 629         __le16  wRES;
 630 } __packed;
 631
 632 struct cntrl_cur_lay3 {
 633         __le32  dCUR;
 634 };
 635
 636 struct cntrl_range_lay3 {
 637         __le16  wNumSubRanges;
 638         __le32  dMIN;
 639         __le32  dMAX;
 640         __le32  dRES;
 641 } __packed;
 642
 643 static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
 644         struct usb_endpoint_descriptor *ep_desc,
 645         enum usb_device_speed speed, bool is_playback)
 646 {
 647         int chmask, srate, ssize;
 648         u16 max_size_bw, max_size_ep;
 649         unsigned int factor;
 650
 651         switch (speed) {
 652         case USB_SPEED_FULL:
 653                 max_size_ep = 1023;
 654                 factor = 1000;
 655                 break;
 656
 657         case USB_SPEED_HIGH:
 658         case USB_SPEED_SUPER:
 659                 max_size_ep = 1024;
 660                 factor = 8000;
 661                 break;
 662
 663         default:
 664                 return -EINVAL;
 665         }
 666
 667         if (is_playback) {
 668                 chmask = uac2_opts->p_chmask;
 669                 srate = uac2_opts->p_srate;
 670                 ssize = uac2_opts->p_ssize;
 671         } else {
 672                 chmask = uac2_opts->c_chmask;
 673                 srate = uac2_opts->c_srate;
 674                 ssize = uac2_opts->c_ssize;
 675         }
 676
 677         if (!is_playback && (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
 678           // Win10 requires max packet size + 1 frame
 679                 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
 680                 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
 681                 max_size_bw = num_channels(chmask) * ssize *
 682                         (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))));
 683         } else {
 684                 // adding 1 frame provision for Win10
 685                 max_size_bw = num_channels(chmask) * ssize *
 686                         (DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))) + 1);
 687         }
 688         ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
 689                                                     max_size_ep));
 690
 691         return 0;
 692 }
 693
 694 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
 695 {
 696         struct uac2_feature_unit_descriptor *fu_desc;
 697         int channels = num_channels(chmask);
 698         int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
 699
 700         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 701         if (!fu_desc)
 702                 return NULL;
 703
 704         fu_desc->bLength = fu_desc_size;
 705         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 706
 707         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 708
 709         /* bUnitID, bSourceID and bmaControls will be defined later */
 710
 711         return fu_desc;
 712 }
 713
 714 /* Use macro to overcome line length limitation */
 715 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
 716
 717 static void setup_headers(struct f_uac2_opts *opts,
 718                           struct usb_descriptor_header **headers,
 719                           enum usb_device_speed speed)
 720 {
 721         struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
 722         struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
 723         struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
 724         struct usb_endpoint_descriptor *epout_desc;
 725         struct usb_endpoint_descriptor *epin_desc;
 726         struct usb_endpoint_descriptor *epin_fback_desc;
 727         struct usb_endpoint_descriptor *ep_int_desc;
 728         int i;
 729
 730         switch (speed) {
 731         case USB_SPEED_FULL:
 732                 epout_desc = &fs_epout_desc;
 733                 epin_desc = &fs_epin_desc;
 734                 epin_fback_desc = &fs_epin_fback_desc;
 735                 ep_int_desc = &fs_ep_int_desc;
 736                 break;
 737         case USB_SPEED_HIGH:
 738                 epout_desc = &hs_epout_desc;
 739                 epin_desc = &hs_epin_desc;
 740                 epin_fback_desc = &hs_epin_fback_desc;
 741                 ep_int_desc = &hs_ep_int_desc;
 742                 break;
 743         default:
 744                 epout_desc = &ss_epout_desc;
 745                 epin_desc = &ss_epin_desc;
 746                 epout_desc_comp = &ss_epout_desc_comp;
 747                 epin_desc_comp = &ss_epin_desc_comp;
 748                 epin_fback_desc = &ss_epin_fback_desc;
 749                 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
 750                 ep_int_desc = &ss_ep_int_desc;
 751         }
 752
 753         i = 0;
 754         headers[i++] = USBDHDR(&iad_desc);
 755         headers[i++] = USBDHDR(&std_ac_if_desc);
 756         headers[i++] = USBDHDR(&ac_hdr_desc);
 757         if (EPIN_EN(opts))
 758                 headers[i++] = USBDHDR(&in_clk_src_desc);
 759         if (EPOUT_EN(opts)) {
 760                 headers[i++] = USBDHDR(&out_clk_src_desc);
 761                 headers[i++] = USBDHDR(&usb_out_it_desc);
 762
 763     if (FUOUT_EN(opts))
 764       headers[i++] = USBDHDR(out_feature_unit_desc);
 765   }
 766
 767         if (EPIN_EN(opts)) {
 768                 headers[i++] = USBDHDR(&io_in_it_desc);
 769
 770     if (FUIN_EN(opts))
 771       headers[i++] = USBDHDR(in_feature_unit_desc);
 772
 773                 headers[i++] = USBDHDR(&usb_in_ot_desc);
 774         }
 775
 776         if (EPOUT_EN(opts))
 777                 headers[i++] = USBDHDR(&io_out_ot_desc);
 778
 779   if (FUOUT_EN(opts) || FUIN_EN(opts))
 780       headers[i++] = USBDHDR(ep_int_desc);
 781
 782   if (EPOUT_EN(opts)) {
 783                 headers[i++] = USBDHDR(&std_as_out_if0_desc);
 784                 headers[i++] = USBDHDR(&std_as_out_if1_desc);
 785                 headers[i++] = USBDHDR(&as_out_hdr_desc);
 786                 headers[i++] = USBDHDR(&as_out_fmt1_desc);
 787                 headers[i++] = USBDHDR(epout_desc);
 788                 if (epout_desc_comp)
 789                         headers[i++] = USBDHDR(epout_desc_comp);
 790
 791                 headers[i++] = USBDHDR(&as_iso_out_desc);
 792
 793                 if (EPOUT_FBACK_IN_EN(opts)) {
 794                         headers[i++] = USBDHDR(epin_fback_desc);
 795                         if (epin_fback_desc_comp)
 796                                 headers[i++] = USBDHDR(epin_fback_desc_comp);
 797                 }
 798         }
 799
 800         if (EPIN_EN(opts)) {
 801                 headers[i++] = USBDHDR(&std_as_in_if0_desc);
 802                 headers[i++] = USBDHDR(&std_as_in_if1_desc);
 803                 headers[i++] = USBDHDR(&as_in_hdr_desc);
 804                 headers[i++] = USBDHDR(&as_in_fmt1_desc);
 805                 headers[i++] = USBDHDR(epin_desc);
 806                 if (epin_desc_comp)
 807                         headers[i++] = USBDHDR(epin_desc_comp);
 808
 809                 headers[i++] = USBDHDR(&as_iso_in_desc);
 810         }
 811         headers[i] = NULL;
 812 }
 813
 814 static void setup_descriptor(struct f_uac2_opts *opts)
 815 {
 816         /* patch descriptors */
 817         int i = 1; /* ID's start with 1 */
 818
 819         if (EPOUT_EN(opts))
 820                 usb_out_it_desc.bTerminalID = i++;
 821         if (EPIN_EN(opts))
 822                 io_in_it_desc.bTerminalID = i++;
 823         if (EPOUT_EN(opts))
 824                 io_out_ot_desc.bTerminalID = i++;
 825         if (EPIN_EN(opts))
 826                 usb_in_ot_desc.bTerminalID = i++;
 827         if (FUOUT_EN(opts))
 828                 out_feature_unit_desc->bUnitID = i++;
 829         if (FUIN_EN(opts))
 830                 in_feature_unit_desc->bUnitID = i++;
 831         if (EPOUT_EN(opts))
 832                 out_clk_src_desc.bClockID = i++;
 833         if (EPIN_EN(opts))
 834                 in_clk_src_desc.bClockID = i++;
 835
 836         usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
 837
 838         if (FUIN_EN(opts)) {
 839                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
 840                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
 841         } else {
 842                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
 843         }
 844
 845         usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
 846         io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
 847         io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
 848
 849         if (FUOUT_EN(opts)) {
 850                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
 851                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
 852         } else {
 853                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
 854         }
 855
 856         as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
 857         as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 858
 859         iad_desc.bInterfaceCount = 1;
 860         ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 861
 862         if (EPIN_EN(opts)) {
 863                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 864
 865                 len += sizeof(in_clk_src_desc);
 866                 len += sizeof(usb_in_ot_desc);
 867
 868                 if (FUIN_EN(opts))
 869                         len += in_feature_unit_desc->bLength;
 870
 871                 len += sizeof(io_in_it_desc);
 872                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 873                 iad_desc.bInterfaceCount++;
 874         }
 875         if (EPOUT_EN(opts)) {
 876                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 877
 878                 len += sizeof(out_clk_src_desc);
 879                 len += sizeof(usb_out_it_desc);
 880
 881                 if (FUOUT_EN(opts))
 882                         len += out_feature_unit_desc->bLength;
 883
 884                 len += sizeof(io_out_ot_desc);
 885                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 886                 iad_desc.bInterfaceCount++;
 887         }
 888
 889         setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
 890         setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
 891         setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
 892 }
 893
 894 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
 895 {
 896         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
 897
 898         if (!opts->p_chmask && !opts->c_chmask) {
 899                 dev_err(dev, "Error: no playback and capture channels\n");
 900                 return -EINVAL;
 901         } else if (opts->p_chmask & ~UAC2_CHANNEL_MASK) {
 902                 dev_err(dev, "Error: unsupported playback channels mask\n");
 903                 return -EINVAL;
 904         } else if (opts->c_chmask & ~UAC2_CHANNEL_MASK) {
 905                 dev_err(dev, "Error: unsupported capture channels mask\n");
 906                 return -EINVAL;
 907         } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
 908                 dev_err(dev, "Error: incorrect playback sample size\n");
 909                 return -EINVAL;
 910         } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
 911                 dev_err(dev, "Error: incorrect capture sample size\n");
 912                 return -EINVAL;
 913         } else if (!opts->p_srate) {
 914                 dev_err(dev, "Error: incorrect playback sampling rate\n");
 915                 return -EINVAL;
 916         } else if (!opts->c_srate) {
 917                 dev_err(dev, "Error: incorrect capture sampling rate\n");
 918                 return -EINVAL;
 919         }
 920
 921         if (opts->p_volume_max <= opts->p_volume_min) {
 922                 dev_err(dev, "Error: incorrect playback volume max/min\n");
 923                         return -EINVAL;
 924         } else if (opts->c_volume_max <= opts->c_volume_min) {
 925                 dev_err(dev, "Error: incorrect capture volume max/min\n");
 926                         return -EINVAL;
 927         } else if (opts->p_volume_res <= 0) {
 928                 dev_err(dev, "Error: negative/zero playback volume resolution\n");
 929                         return -EINVAL;
 930         } else if (opts->c_volume_res <= 0) {
 931                 dev_err(dev, "Error: negative/zero capture volume resolution\n");
 932                         return -EINVAL;
 933         }
 934
 935         if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res) {
 936                 dev_err(dev, "Error: incorrect playback volume resolution\n");
 937                         return -EINVAL;
 938         } else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res) {
 939                 dev_err(dev, "Error: incorrect capture volume resolution\n");
 940                         return -EINVAL;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int
 947 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 948 {
 949         struct f_uac2 *uac2 = func_to_uac2(fn);
 950         struct g_audio *agdev = func_to_g_audio(fn);
 951         struct usb_composite_dev *cdev = cfg->cdev;
 952         struct usb_gadget *gadget = cdev->gadget;
 953         struct device *dev = &gadget->dev;
 954         struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
 955         struct usb_string *us;
 956         int ret;
 957
 958         ret = afunc_validate_opts(agdev, dev);
 959         if (ret)
 960                 return ret;
 961
 962         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
 963         if (IS_ERR(us))
 964                 return PTR_ERR(us);
 965
 966         if (FUOUT_EN(uac2_opts)) {
 967                 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
 968                 if (!out_feature_unit_desc)
 969                         return -ENOMEM;
 970         }
 971         if (FUIN_EN(uac2_opts)) {
 972                 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
 973                 if (!in_feature_unit_desc) {
 974                         ret = -ENOMEM;
 975                         goto err_free_fu;
 976                 }
 977         }
 978
 979         iad_desc.iFunction = us[STR_ASSOC].id;
 980         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
 981         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
 982         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
 983         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
 984         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
 985         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
 986         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
 987         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
 988         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
 989         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
 990         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
 991
 992         if (FUOUT_EN(uac2_opts)) {
 993                 u8 *i_feature = (u8 *)out_feature_unit_desc +
 994                                 out_feature_unit_desc->bLength - 1;
 995                 *i_feature = us[STR_FU_OUT].id;
 996         }
 997         if (FUIN_EN(uac2_opts)) {
 998                 u8 *i_feature = (u8 *)in_feature_unit_desc +
 999                                 in_feature_unit_desc->bLength - 1;
1000                 *i_feature = us[STR_FU_IN].id;
1001         }
1002
1003
1004         /* Initialize the configurable parameters */
1005         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1006         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1007         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1008         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1009         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1010         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1011         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1012         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1013         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1014         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1015         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1016         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1017         if (FUOUT_EN(uac2_opts)) {
1018                 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1019                 u32 control = 0;
1020
1021                 if (uac2_opts->c_mute_present)
1022                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1023                 if (uac2_opts->c_volume_present)
1024                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1025                 *bma = cpu_to_le32(control);
1026         }
1027         if (FUIN_EN(uac2_opts)) {
1028                 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1029                 u32 control = 0;
1030
1031                 if (uac2_opts->p_mute_present)
1032                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1033                 if (uac2_opts->p_volume_present)
1034                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1035                 *bma = cpu_to_le32(control);
1036         }
1037
1038         snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1039         snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1040
1041         ret = usb_interface_id(cfg, fn);
1042         if (ret < 0) {
1043                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1044                 goto err_free_fu;
1045         }
1046         iad_desc.bFirstInterface = ret;
1047
1048         std_ac_if_desc.bInterfaceNumber = ret;
1049         uac2->ac_intf = ret;
1050         uac2->ac_alt = 0;
1051
1052         if (EPOUT_EN(uac2_opts)) {
1053                 ret = usb_interface_id(cfg, fn);
1054                 if (ret < 0) {
1055                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1056                         goto err_free_fu;
1057                 }
1058                 std_as_out_if0_desc.bInterfaceNumber = ret;
1059                 std_as_out_if1_desc.bInterfaceNumber = ret;
1060                 uac2->as_out_intf = ret;
1061                 uac2->as_out_alt = 0;
1062
1063                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1064                         fs_epout_desc.bmAttributes =
1065                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1066                         hs_epout_desc.bmAttributes =
1067                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1068                         ss_epout_desc.bmAttributes =
1069                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1070                         std_as_out_if1_desc.bNumEndpoints++;
1071                 } else {
1072                         fs_epout_desc.bmAttributes =
1073                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1074                         hs_epout_desc.bmAttributes =
1075                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1076                         ss_epout_desc.bmAttributes =
1077                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1078                 }
1079         }
1080
1081         if (EPIN_EN(uac2_opts)) {
1082                 ret = usb_interface_id(cfg, fn);
1083                 if (ret < 0) {
1084                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1085                         goto err_free_fu;
1086                 }
1087                 std_as_in_if0_desc.bInterfaceNumber = ret;
1088                 std_as_in_if1_desc.bInterfaceNumber = ret;
1089                 uac2->as_in_intf = ret;
1090                 uac2->as_in_alt = 0;
1091         }
1092
1093         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1094                 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1095                 if (!uac2->int_ep) {
1096                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1097                         ret = -ENODEV;
1098                         goto err_free_fu;
1099                 }
1100
1101                 std_ac_if_desc.bNumEndpoints = 1;
1102         }
1103
1104         /* Calculate wMaxPacketSize according to audio bandwidth */
1105         ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
1106                                      true);
1107         if (ret < 0) {
1108                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1109                 return ret;
1110         }
1111
1112         ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
1113                                      false);
1114         if (ret < 0) {
1115                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1116                 return ret;
1117         }
1118
1119         ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
1120                                      true);
1121         if (ret < 0) {
1122                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1123                 return ret;
1124         }
1125
1126         ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
1127                                      false);
1128         if (ret < 0) {
1129                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1130                 return ret;
1131         }
1132
1133         ret = set_ep_max_packet_size(uac2_opts, &ss_epin_desc, USB_SPEED_SUPER,
1134                                      true);
1135         if (ret < 0) {
1136                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1137                 return ret;
1138         }
1139
1140         ret = set_ep_max_packet_size(uac2_opts, &ss_epout_desc, USB_SPEED_SUPER,
1141                                      false);
1142         if (ret < 0) {
1143                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1144                 return ret;
1145         }
1146
1147         if (EPOUT_EN(uac2_opts)) {
1148                 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1149                 if (!agdev->out_ep) {
1150                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1151                         ret = -ENODEV;
1152                         goto err_free_fu;
1153                 }
1154                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1155                         agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1156                                                        &fs_epin_fback_desc);
1157                         if (!agdev->in_ep_fback) {
1158                                 dev_err(dev, "%s:%d Error!\n",
1159                                         __func__, __LINE__);
1160                                 ret = -ENODEV;
1161                                 goto err_free_fu;
1162                         }
1163                 }
1164         }
1165
1166         if (EPIN_EN(uac2_opts)) {
1167                 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1168                 if (!agdev->in_ep) {
1169                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1170                         ret = -ENODEV;
1171                         goto err_free_fu;
1172                 }
1173         }
1174
1175         agdev->in_ep_maxpsize = max_t(u16,
1176                                 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1177                                 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1178         agdev->out_ep_maxpsize = max_t(u16,
1179                                 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1180                                 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1181
1182         agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1183                                 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1184         agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1185                                 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1186
1187         ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1188         ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1189
1190         // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1191         hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1192         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1193         hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1194         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1195         ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1196         ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1197         ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1198         ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1199
1200         setup_descriptor(uac2_opts);
1201
1202         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1203                                      ss_audio_desc);
1204         if (ret)
1205                 goto err_free_fu;
1206
1207         agdev->gadget = gadget;
1208
1209         agdev->params.p_chmask = uac2_opts->p_chmask;
1210         agdev->params.p_srate = uac2_opts->p_srate;
1211         agdev->params.p_ssize = uac2_opts->p_ssize;
1212         if (FUIN_EN(uac2_opts)) {
1213                 agdev->params.p_fu.id = USB_IN_FU_ID;
1214                 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1215                 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1216                 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1217                 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1218                 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1219         }
1220         agdev->params.c_chmask = uac2_opts->c_chmask;
1221         agdev->params.c_srate = uac2_opts->c_srate;
1222         agdev->params.c_ssize = uac2_opts->c_ssize;
1223         if (FUOUT_EN(uac2_opts)) {
1224                 agdev->params.c_fu.id = USB_OUT_FU_ID;
1225                 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1226                 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1227                 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1228                 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1229                 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1230         }
1231         agdev->params.req_number = uac2_opts->req_number;
1232         agdev->params.fb_max = uac2_opts->fb_max;
1233
1234         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1235     agdev->notify = afunc_notify;
1236
1237         ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1238         if (ret)
1239                 goto err_free_descs;
1240
1241         return 0;
1242
1243 err_free_descs:
1244         usb_free_all_descriptors(fn);
1245         agdev->gadget = NULL;
1246 err_free_fu:
1247         kfree(out_feature_unit_desc);
1248         out_feature_unit_desc = NULL;
1249         kfree(in_feature_unit_desc);
1250         in_feature_unit_desc = NULL;
1251         return ret;
1252 }
1253
1254 static void
1255 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1256 {
1257         struct g_audio *agdev = req->context;
1258         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1259
1260         atomic_dec(&uac2->int_count);
1261         kfree(req->buf);
1262         usb_ep_free_request(_ep, req);
1263 }
1264
1265 static int
1266 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1267 {
1268         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1269         struct usb_request *req;
1270         struct uac2_interrupt_data_msg *msg;
1271         u16 w_index, w_value;
1272         int ret;
1273
1274         if (!uac2->int_ep->enabled)
1275                 return 0;
1276
1277         if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1278                 atomic_dec(&uac2->int_count);
1279                 return 0;
1280         }
1281
1282         req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1283         if (req == NULL) {
1284                 ret = -ENOMEM;
1285                 goto err_dec_int_count;
1286         }
1287
1288         msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1289         if (msg == NULL) {
1290                 ret = -ENOMEM;
1291                 goto err_free_request;
1292         }
1293
1294         w_index = unit_id << 8 | uac2->ac_intf;
1295         w_value = cs << 8;
1296
1297         msg->bInfo = 0; /* Non-vendor, interface interrupt */
1298         msg->bAttribute = UAC2_CS_CUR;
1299         msg->wIndex = cpu_to_le16(w_index);
1300         msg->wValue = cpu_to_le16(w_value);
1301
1302         req->length = sizeof(*msg);
1303         req->buf = msg;
1304         req->context = agdev;
1305         req->complete = afunc_notify_complete;
1306
1307         ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1308
1309         if (ret)
1310                 goto err_free_msg;
1311
1312         return 0;
1313
1314 err_free_msg:
1315         kfree(msg);
1316 err_free_request:
1317         usb_ep_free_request(uac2->int_ep, req);
1318 err_dec_int_count:
1319         atomic_dec(&uac2->int_count);
1320
1321         return ret;
1322 }
1323
1324 static int
1325 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1326 {
1327         struct usb_composite_dev *cdev = fn->config->cdev;
1328         struct f_uac2 *uac2 = func_to_uac2(fn);
1329         struct g_audio *agdev = func_to_g_audio(fn);
1330         struct usb_gadget *gadget = cdev->gadget;
1331         struct device *dev = &gadget->dev;
1332         int ret = 0;
1333
1334         /* No i/f has more than 2 alt settings */
1335         if (alt > 1) {
1336                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1337                 return -EINVAL;
1338         }
1339
1340         if (intf == uac2->ac_intf) {
1341                 /* Control I/f has only 1 AltSetting - 0 */
1342                 if (alt) {
1343                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1344                         return -EINVAL;
1345                 }
1346
1347                 /* restart interrupt endpoint */
1348                 if (uac2->int_ep) {
1349                         usb_ep_disable(uac2->int_ep);
1350                         config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1351                         usb_ep_enable(uac2->int_ep);
1352                 }
1353
1354                 return 0;
1355         }
1356
1357         if (intf == uac2->as_out_intf) {
1358                 uac2->as_out_alt = alt;
1359
1360                 if (alt)
1361                         ret = u_audio_start_capture(&uac2->g_audio);
1362                 else
1363                         u_audio_stop_capture(&uac2->g_audio);
1364         } else if (intf == uac2->as_in_intf) {
1365                 uac2->as_in_alt = alt;
1366
1367                 if (alt)
1368                         ret = u_audio_start_playback(&uac2->g_audio);
1369                 else
1370                         u_audio_stop_playback(&uac2->g_audio);
1371         } else {
1372                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1373                 return -EINVAL;
1374         }
1375
1376         return ret;
1377 }
1378
1379 static int
1380 afunc_get_alt(struct usb_function *fn, unsigned intf)
1381 {
1382         struct f_uac2 *uac2 = func_to_uac2(fn);
1383         struct g_audio *agdev = func_to_g_audio(fn);
1384
1385         if (intf == uac2->ac_intf)
1386                 return uac2->ac_alt;
1387         else if (intf == uac2->as_out_intf)
1388                 return uac2->as_out_alt;
1389         else if (intf == uac2->as_in_intf)
1390                 return uac2->as_in_alt;
1391         else
1392                 dev_err(&agdev->gadget->dev,
1393                         "%s:%d Invalid Interface %d!\n",
1394                         __func__, __LINE__, intf);
1395
1396         return -EINVAL;
1397 }
1398
1399 static void
1400 afunc_disable(struct usb_function *fn)
1401 {
1402         struct f_uac2 *uac2 = func_to_uac2(fn);
1403
1404         uac2->as_in_alt = 0;
1405         uac2->as_out_alt = 0;
1406         u_audio_stop_capture(&uac2->g_audio);
1407         u_audio_stop_playback(&uac2->g_audio);
1408         if (uac2->int_ep)
1409                 usb_ep_disable(uac2->int_ep);
1410 }
1411
1412 static int
1413 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1414 {
1415         struct usb_request *req = fn->config->cdev->req;
1416         struct g_audio *agdev = func_to_g_audio(fn);
1417         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1418         u16 w_length = le16_to_cpu(cr->wLength);
1419         u16 w_index = le16_to_cpu(cr->wIndex);
1420         u16 w_value = le16_to_cpu(cr->wValue);
1421         u8 entity_id = (w_index >> 8) & 0xff;
1422         u8 control_selector = w_value >> 8;
1423         int value = -EOPNOTSUPP;
1424         int p_srate, c_srate;
1425
1426         p_srate = opts->p_srate;
1427         c_srate = opts->c_srate;
1428
1429         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1430                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1431                         struct cntrl_cur_lay3 c;
1432
1433                         memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1434
1435                         if (entity_id == USB_IN_CLK_ID)
1436                                 c.dCUR = cpu_to_le32(p_srate);
1437                         else if (entity_id == USB_OUT_CLK_ID)
1438                                 c.dCUR = cpu_to_le32(c_srate);
1439
1440                         value = min_t(unsigned int, w_length, sizeof(c));
1441                         memcpy(req->buf, &c, value);
1442                 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1443                         *(u8 *)req->buf = 1;
1444                         value = min_t(unsigned int, w_length, 1);
1445                 } else {
1446                         dev_err(&agdev->gadget->dev,
1447                                 "%s:%d control_selector=%d TODO!\n",
1448                                 __func__, __LINE__, control_selector);
1449                 }
1450         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1451                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1452                 unsigned int is_playback = 0;
1453
1454                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1455                         is_playback = 1;
1456
1457                 if (control_selector == UAC_FU_MUTE) {
1458                         unsigned int mute;
1459
1460                         u_audio_get_mute(agdev, is_playback, &mute);
1461
1462                         *(u8 *)req->buf = mute;
1463                         value = min_t(unsigned int, w_length, 1);
1464                 } else if (control_selector == UAC_FU_VOLUME) {
1465                         struct cntrl_cur_lay2 c;
1466                         s16 volume;
1467
1468                         memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1469
1470                         u_audio_get_volume(agdev, is_playback, &volume);
1471                         c.wCUR = cpu_to_le16(volume);
1472
1473                         value = min_t(unsigned int, w_length, sizeof(c));
1474                         memcpy(req->buf, &c, value);
1475                 } else {
1476                         dev_err(&agdev->gadget->dev,
1477                                 "%s:%d control_selector=%d TODO!\n",
1478                                 __func__, __LINE__, control_selector);
1479                 }
1480         } else {
1481                 dev_err(&agdev->gadget->dev,
1482                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1483                         __func__, __LINE__, entity_id, control_selector);
1484         }
1485
1486         return value;
1487 }
1488
1489 static int
1490 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1491 {
1492         struct usb_request *req = fn->config->cdev->req;
1493         struct g_audio *agdev = func_to_g_audio(fn);
1494         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1495         u16 w_length = le16_to_cpu(cr->wLength);
1496         u16 w_index = le16_to_cpu(cr->wIndex);
1497         u16 w_value = le16_to_cpu(cr->wValue);
1498         u8 entity_id = (w_index >> 8) & 0xff;
1499         u8 control_selector = w_value >> 8;
1500         int value = -EOPNOTSUPP;
1501         int p_srate, c_srate;
1502
1503         p_srate = opts->p_srate;
1504         c_srate = opts->c_srate;
1505
1506         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1507                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1508                         struct cntrl_range_lay3 r;
1509
1510                         if (entity_id == USB_IN_CLK_ID)
1511                                 r.dMIN = cpu_to_le32(p_srate);
1512                         else if (entity_id == USB_OUT_CLK_ID)
1513                                 r.dMIN = cpu_to_le32(c_srate);
1514                         else
1515                                 return -EOPNOTSUPP;
1516
1517                         r.dMAX = r.dMIN;
1518                         r.dRES = 0;
1519                         r.wNumSubRanges = cpu_to_le16(1);
1520
1521                         value = min_t(unsigned int, w_length, sizeof(r));
1522                         memcpy(req->buf, &r, value);
1523                 } else {
1524                         dev_err(&agdev->gadget->dev,
1525                                 "%s:%d control_selector=%d TODO!\n",
1526                                 __func__, __LINE__, control_selector);
1527                 }
1528         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1529                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1530                 unsigned int is_playback = 0;
1531
1532                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1533                         is_playback = 1;
1534
1535                 if (control_selector == UAC_FU_VOLUME) {
1536                         struct cntrl_range_lay2 r;
1537                         s16 max_db, min_db, res_db;
1538
1539                         if (is_playback) {
1540                                 max_db = opts->p_volume_max;
1541                                 min_db = opts->p_volume_min;
1542                                 res_db = opts->p_volume_res;
1543                         } else {
1544                                 max_db = opts->c_volume_max;
1545                                 min_db = opts->c_volume_min;
1546                                 res_db = opts->c_volume_res;
1547                         }
1548
1549                         r.wMAX = cpu_to_le16(max_db);
1550                         r.wMIN = cpu_to_le16(min_db);
1551                         r.wRES = cpu_to_le16(res_db);
1552                         r.wNumSubRanges = cpu_to_le16(1);
1553
1554                         value = min_t(unsigned int, w_length, sizeof(r));
1555                         memcpy(req->buf, &r, value);
1556                 } else {
1557                         dev_err(&agdev->gadget->dev,
1558                                 "%s:%d control_selector=%d TODO!\n",
1559                                 __func__, __LINE__, control_selector);
1560                 }
1561         } else {
1562                 dev_err(&agdev->gadget->dev,
1563                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1564                         __func__, __LINE__, entity_id, control_selector);
1565         }
1566
1567         return value;
1568 }
1569
1570 static int
1571 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1572 {
1573         if (cr->bRequest == UAC2_CS_CUR)
1574                 return in_rq_cur(fn, cr);
1575         else if (cr->bRequest == UAC2_CS_RANGE)
1576                 return in_rq_range(fn, cr);
1577         else
1578                 return -EOPNOTSUPP;
1579 }
1580
1581 static void
1582 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1583 {
1584         struct g_audio *agdev = req->context;
1585         struct usb_composite_dev *cdev = agdev->func.config->cdev;
1586         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1587         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1588         struct usb_ctrlrequest *cr = &uac2->setup_cr;
1589         u16 w_index = le16_to_cpu(cr->wIndex);
1590         u16 w_value = le16_to_cpu(cr->wValue);
1591         u8 entity_id = (w_index >> 8) & 0xff;
1592         u8 control_selector = w_value >> 8;
1593
1594         if (req->status != 0) {
1595                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1596                 return;
1597         }
1598
1599         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1600                 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1601                 unsigned int is_playback = 0;
1602
1603                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1604                         is_playback = 1;
1605
1606                 if (control_selector == UAC_FU_MUTE) {
1607                         u8 mute = *(u8 *)req->buf;
1608
1609                         u_audio_set_mute(agdev, is_playback, mute);
1610
1611                         return;
1612                 } else if (control_selector == UAC_FU_VOLUME) {
1613                         struct cntrl_cur_lay2 *c = req->buf;
1614                         s16 volume;
1615
1616                         volume = le16_to_cpu(c->wCUR);
1617                         u_audio_set_volume(agdev, is_playback, volume);
1618
1619                         return;
1620                 } else {
1621                         dev_err(&agdev->gadget->dev,
1622                                 "%s:%d control_selector=%d TODO!\n",
1623                                 __func__, __LINE__, control_selector);
1624                         usb_ep_set_halt(ep);
1625                 }
1626         }
1627 }
1628
1629 static int
1630 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1631 {
1632         struct usb_request *req = fn->config->cdev->req;
1633         struct g_audio *agdev = func_to_g_audio(fn);
1634         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1635         struct f_uac2 *uac2 = func_to_uac2(fn);
1636         u16 w_length = le16_to_cpu(cr->wLength);
1637         u16 w_index = le16_to_cpu(cr->wIndex);
1638         u16 w_value = le16_to_cpu(cr->wValue);
1639         u8 entity_id = (w_index >> 8) & 0xff;
1640         u8 control_selector = w_value >> 8;
1641
1642         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1643                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1644                         return w_length;
1645         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1646                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1647                 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1648                 req->context = agdev;
1649                 req->complete = out_rq_cur_complete;
1650
1651                 return w_length;
1652         } else {
1653                 dev_err(&agdev->gadget->dev,
1654                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1655                         __func__, __LINE__, entity_id, control_selector);
1656         }
1657         return -EOPNOTSUPP;
1658 }
1659
1660 static int
1661 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1662 {
1663         struct f_uac2 *uac2 = func_to_uac2(fn);
1664         struct g_audio *agdev = func_to_g_audio(fn);
1665         u16 w_index = le16_to_cpu(cr->wIndex);
1666         u8 intf = w_index & 0xff;
1667
1668         if (intf != uac2->ac_intf) {
1669                 dev_err(&agdev->gadget->dev,
1670                         "%s:%d Error!\n", __func__, __LINE__);
1671                 return -EOPNOTSUPP;
1672         }
1673
1674         if (cr->bRequestType & USB_DIR_IN)
1675                 return ac_rq_in(fn, cr);
1676         else if (cr->bRequest == UAC2_CS_CUR)
1677                 return out_rq_cur(fn, cr);
1678
1679         return -EOPNOTSUPP;
1680 }
1681
1682 static int
1683 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1684 {
1685         struct usb_composite_dev *cdev = fn->config->cdev;
1686         struct g_audio *agdev = func_to_g_audio(fn);
1687         struct usb_request *req = cdev->req;
1688         u16 w_length = le16_to_cpu(cr->wLength);
1689         int value = -EOPNOTSUPP;
1690
1691         /* Only Class specific requests are supposed to reach here */
1692         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1693                 return -EOPNOTSUPP;
1694
1695         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1696                 value = setup_rq_inf(fn, cr);
1697         else
1698                 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1699                                 __func__, __LINE__);
1700
1701         if (value >= 0) {
1702                 req->length = value;
1703                 req->zero = value < w_length;
1704                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1705                 if (value < 0) {
1706                         dev_err(&agdev->gadget->dev,
1707                                 "%s:%d Error!\n", __func__, __LINE__);
1708                         req->status = 0;
1709                 }
1710         }
1711
1712         return value;
1713 }
1714
1715 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1716 {
1717         return container_of(to_config_group(item), struct f_uac2_opts,
1718                             func_inst.group);
1719 }
1720
1721 static void f_uac2_attr_release(struct config_item *item)
1722 {
1723         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1724
1725         usb_put_function_instance(&opts->func_inst);
1726 }
1727
1728 static struct configfs_item_operations f_uac2_item_ops = {
1729         .release        = f_uac2_attr_release,
1730 };
1731
1732 #define uac2_kstrtou32 kstrtou32
1733 #define uac2_kstrtos16 kstrtos16
1734 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1735
1736 static const char *u32_fmt = "%u\n";
1737 static const char *s16_fmt = "%hd\n";
1738 static const char *bool_fmt = "%u\n";
1739
1740 #define UAC2_ATTRIBUTE(type, name)                                      \
1741 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1742                                          char *page)                    \
1743 {                                                                       \
1744         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1745         int result;                                                     \
1746                                                                         \
1747         mutex_lock(&opts->lock);                                        \
1748         result = sprintf(page, type##_fmt, opts->name);                 \
1749         mutex_unlock(&opts->lock);                                      \
1750                                                                         \
1751         return result;                                                  \
1752 }                                                                       \
1753                                                                         \
1754 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1755                                           const char *page, size_t len) \
1756 {                                                                       \
1757         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1758         int ret;                                                        \
1759         type num;                                                       \
1760                                                                         \
1761         mutex_lock(&opts->lock);                                        \
1762         if (opts->refcnt) {                                             \
1763                 ret = -EBUSY;                                           \
1764                 goto end;                                               \
1765         }                                                               \
1766                                                                         \
1767         ret = uac2_kstrto##type(page, 0, &num);                         \
1768         if (ret)                                                        \
1769                 goto end;                                               \
1770                                                                         \
1771         opts->name = num;                                               \
1772         ret = len;                                                      \
1773                                                                         \
1774 end:                                                                    \
1775         mutex_unlock(&opts->lock);                                      \
1776         return ret;                                                     \
1777 }                                                                       \
1778                                                                         \
1779 CONFIGFS_ATTR(f_uac2_opts_, name)
1780
1781 #define UAC2_ATTRIBUTE_SYNC(name)                                       \
1782 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1783                                          char *page)                    \
1784 {                                                                       \
1785         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1786         int result;                                                     \
1787         char *str;                                                      \
1788                                                                         \
1789         mutex_lock(&opts->lock);                                        \
1790         switch (opts->name) {                                           \
1791         case USB_ENDPOINT_SYNC_ASYNC:                                   \
1792                 str = "async";                                          \
1793                 break;                                                  \
1794         case USB_ENDPOINT_SYNC_ADAPTIVE:                                \
1795                 str = "adaptive";                                       \
1796                 break;                                                  \
1797         default:                                                        \
1798                 str = "unknown";                                        \
1799                 break;                                                  \
1800         }                                                               \
1801         result = sprintf(page, "%s\n", str);                            \
1802         mutex_unlock(&opts->lock);                                      \
1803                                                                         \
1804         return result;                                                  \
1805 }                                                                       \
1806                                                                         \
1807 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1808                                           const char *page, size_t len) \
1809 {                                                                       \
1810         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1811         int ret = 0;                                                    \
1812                                                                         \
1813         mutex_lock(&opts->lock);                                        \
1814         if (opts->refcnt) {                                             \
1815                 ret = -EBUSY;                                           \
1816                 goto end;                                               \
1817         }                                                               \
1818                                                                         \
1819         if (!strncmp(page, "async", 5))                                 \
1820                 opts->name = USB_ENDPOINT_SYNC_ASYNC;                   \
1821         else if (!strncmp(page, "adaptive", 8))                         \
1822                 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE;                \
1823         else {                                                          \
1824                 ret = -EINVAL;                                          \
1825                 goto end;                                               \
1826         }                                                               \
1827                                                                         \
1828         ret = len;                                                      \
1829                                                                         \
1830 end:                                                                    \
1831         mutex_unlock(&opts->lock);                                      \
1832         return ret;                                                     \
1833 }                                                                       \
1834                                                                         \
1835 CONFIGFS_ATTR(f_uac2_opts_, name)
1836
1837 UAC2_ATTRIBUTE(u32, p_chmask);
1838 UAC2_ATTRIBUTE(u32, p_srate);
1839 UAC2_ATTRIBUTE(u32, p_ssize);
1840 UAC2_ATTRIBUTE(u32, c_chmask);
1841 UAC2_ATTRIBUTE(u32, c_srate);
1842 UAC2_ATTRIBUTE_SYNC(c_sync);
1843 UAC2_ATTRIBUTE(u32, c_ssize);
1844 UAC2_ATTRIBUTE(u32, req_number);
1845
1846 UAC2_ATTRIBUTE(bool, p_mute_present);
1847 UAC2_ATTRIBUTE(bool, p_volume_present);
1848 UAC2_ATTRIBUTE(s16, p_volume_min);
1849 UAC2_ATTRIBUTE(s16, p_volume_max);
1850 UAC2_ATTRIBUTE(s16, p_volume_res);
1851
1852 UAC2_ATTRIBUTE(bool, c_mute_present);
1853 UAC2_ATTRIBUTE(bool, c_volume_present);
1854 UAC2_ATTRIBUTE(s16, c_volume_min);
1855 UAC2_ATTRIBUTE(s16, c_volume_max);
1856 UAC2_ATTRIBUTE(s16, c_volume_res);
1857 UAC2_ATTRIBUTE(u32, fb_max);
1858
1859 static struct configfs_attribute *f_uac2_attrs[] = {
1860         &f_uac2_opts_attr_p_chmask,
1861         &f_uac2_opts_attr_p_srate,
1862         &f_uac2_opts_attr_p_ssize,
1863         &f_uac2_opts_attr_c_chmask,
1864         &f_uac2_opts_attr_c_srate,
1865         &f_uac2_opts_attr_c_ssize,
1866         &f_uac2_opts_attr_c_sync,
1867         &f_uac2_opts_attr_req_number,
1868         &f_uac2_opts_attr_fb_max,
1869
1870         &f_uac2_opts_attr_p_mute_present,
1871         &f_uac2_opts_attr_p_volume_present,
1872         &f_uac2_opts_attr_p_volume_min,
1873         &f_uac2_opts_attr_p_volume_max,
1874         &f_uac2_opts_attr_p_volume_res,
1875
1876         &f_uac2_opts_attr_c_mute_present,
1877         &f_uac2_opts_attr_c_volume_present,
1878         &f_uac2_opts_attr_c_volume_min,
1879         &f_uac2_opts_attr_c_volume_max,
1880         &f_uac2_opts_attr_c_volume_res,
1881
1882         NULL,
1883 };
1884
1885 static const struct config_item_type f_uac2_func_type = {
1886         .ct_item_ops    = &f_uac2_item_ops,
1887         .ct_attrs       = f_uac2_attrs,
1888         .ct_owner       = THIS_MODULE,
1889 };
1890
1891 static void afunc_free_inst(struct usb_function_instance *f)
1892 {
1893         struct f_uac2_opts *opts;
1894
1895         opts = container_of(f, struct f_uac2_opts, func_inst);
1896         kfree(opts);
1897 }
1898
1899 static struct usb_function_instance *afunc_alloc_inst(void)
1900 {
1901         struct f_uac2_opts *opts;
1902
1903         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1904         if (!opts)
1905                 return ERR_PTR(-ENOMEM);
1906
1907         mutex_init(&opts->lock);
1908         opts->func_inst.free_func_inst = afunc_free_inst;
1909
1910         config_group_init_type_name(&opts->func_inst.group, "",
1911                                     &f_uac2_func_type);
1912
1913         opts->p_chmask = UAC2_DEF_PCHMASK;
1914         opts->p_srate = UAC2_DEF_PSRATE;
1915         opts->p_ssize = UAC2_DEF_PSSIZE;
1916         opts->c_chmask = UAC2_DEF_CCHMASK;
1917         opts->c_srate = UAC2_DEF_CSRATE;
1918         opts->c_ssize = UAC2_DEF_CSSIZE;
1919         opts->c_sync = UAC2_DEF_CSYNC;
1920
1921         opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
1922         opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
1923         opts->p_volume_min = UAC2_DEF_MIN_DB;
1924         opts->p_volume_max = UAC2_DEF_MAX_DB;
1925         opts->p_volume_res = UAC2_DEF_RES_DB;
1926
1927         opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
1928         opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
1929         opts->c_volume_min = UAC2_DEF_MIN_DB;
1930         opts->c_volume_max = UAC2_DEF_MAX_DB;
1931         opts->c_volume_res = UAC2_DEF_RES_DB;
1932
1933         opts->req_number = UAC2_DEF_REQ_NUM;
1934         opts->fb_max = UAC2_DEF_FB_MAX;
1935         return &opts->func_inst;
1936 }
1937
1938 static void afunc_free(struct usb_function *f)
1939 {
1940         struct g_audio *agdev;
1941         struct f_uac2_opts *opts;
1942
1943         agdev = func_to_g_audio(f);
1944         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1945         kfree(agdev);
1946         mutex_lock(&opts->lock);
1947         --opts->refcnt;
1948         mutex_unlock(&opts->lock);
1949 }
1950
1951 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1952 {
1953         struct g_audio *agdev = func_to_g_audio(f);
1954
1955         g_audio_cleanup(agdev);
1956         usb_free_all_descriptors(f);
1957
1958         agdev->gadget = NULL;
1959
1960         kfree(out_feature_unit_desc);
1961         out_feature_unit_desc = NULL;
1962         kfree(in_feature_unit_desc);
1963         in_feature_unit_desc = NULL;
1964 }
1965
1966 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1967 {
1968         struct f_uac2   *uac2;
1969         struct f_uac2_opts *opts;
1970
1971         uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
1972         if (uac2 == NULL)
1973                 return ERR_PTR(-ENOMEM);
1974
1975         opts = container_of(fi, struct f_uac2_opts, func_inst);
1976         mutex_lock(&opts->lock);
1977         ++opts->refcnt;
1978         mutex_unlock(&opts->lock);
1979
1980         uac2->g_audio.func.name = "uac2_func";
1981         uac2->g_audio.func.bind = afunc_bind;
1982         uac2->g_audio.func.unbind = afunc_unbind;
1983         uac2->g_audio.func.set_alt = afunc_set_alt;
1984         uac2->g_audio.func.get_alt = afunc_get_alt;
1985         uac2->g_audio.func.disable = afunc_disable;
1986         uac2->g_audio.func.setup = afunc_setup;
1987         uac2->g_audio.func.free_func = afunc_free;
1988
1989         return &uac2->g_audio.func;
1990 }
1991
1992 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1993 MODULE_LICENSE("GPL");
1994 MODULE_AUTHOR("Yadwinder Singh");
1995 MODULE_AUTHOR("Jaswinder Singh");
1996 MODULE_AUTHOR("Ruslan Bilovol");