drivers/usb/gadget/legacy/webcam.c

   1 /*
   2  *      webcam.c -- USB webcam gadget driver
   3  *
   4  *      Copyright (C) 2009-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/usb/video.h>
  17
  18 #include "u_uvc.h"
  19
  20 USB_GADGET_COMPOSITE_OPTIONS();
  21
  22 /*-------------------------------------------------------------------------*/
  23
  24 /* module parameters specific to the Video streaming endpoint */
  25 static unsigned int streaming_interval = 1;
  26 module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
  27 MODULE_PARM_DESC(streaming_interval, "1 - 16");
  28
  29 static unsigned int streaming_maxpacket = 1024;
  30 module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
  31 MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
  32
  33 static unsigned int streaming_maxburst;
  34 module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
  35 MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
  36
  37 static unsigned int trace;
  38 module_param(trace, uint, S_IRUGO|S_IWUSR);
  39 MODULE_PARM_DESC(trace, "Trace level bitmask");
  40 /* --------------------------------------------------------------------------
  41  * Device descriptor
  42  */
  43
  44 #define WEBCAM_VENDOR_ID                0x1d6b  /* Linux Foundation */
  45 #define WEBCAM_PRODUCT_ID               0x0102  /* Webcam A/V gadget */
  46 #define WEBCAM_DEVICE_BCD               0x0010  /* 0.10 */
  47
  48 static char webcam_vendor_label[] = "Linux Foundation";
  49 static char webcam_product_label[] = "Webcam gadget";
  50 static char webcam_config_label[] = "Video";
  51
  52 /* string IDs are assigned dynamically */
  53
  54 #define STRING_DESCRIPTION_IDX          USB_GADGET_FIRST_AVAIL_IDX
  55
  56 static struct usb_string webcam_strings[] = {
  57         [USB_GADGET_MANUFACTURER_IDX].s = webcam_vendor_label,
  58         [USB_GADGET_PRODUCT_IDX].s = webcam_product_label,
  59         [USB_GADGET_SERIAL_IDX].s = "",
  60         [STRING_DESCRIPTION_IDX].s = webcam_config_label,
  61         {  }
  62 };
  63
  64 static struct usb_gadget_strings webcam_stringtab = {
  65         .language = 0x0409,     /* en-us */
  66         .strings = webcam_strings,
  67 };
  68
  69 static struct usb_gadget_strings *webcam_device_strings[] = {
  70         &webcam_stringtab,
  71         NULL,
  72 };
  73
  74 static struct usb_function_instance *fi_uvc;
  75 static struct usb_function *f_uvc;
  76
  77 static struct usb_device_descriptor webcam_device_descriptor = {
  78         .bLength                = USB_DT_DEVICE_SIZE,
  79         .bDescriptorType        = USB_DT_DEVICE,
  80         .bcdUSB                 = cpu_to_le16(0x0200),
  81         .bDeviceClass           = USB_CLASS_MISC,
  82         .bDeviceSubClass        = 0x02,
  83         .bDeviceProtocol        = 0x01,
  84         .bMaxPacketSize0        = 0, /* dynamic */
  85         .idVendor               = cpu_to_le16(WEBCAM_VENDOR_ID),
  86         .idProduct              = cpu_to_le16(WEBCAM_PRODUCT_ID),
  87         .bcdDevice              = cpu_to_le16(WEBCAM_DEVICE_BCD),
  88         .iManufacturer          = 0, /* dynamic */
  89         .iProduct               = 0, /* dynamic */
  90         .iSerialNumber          = 0, /* dynamic */
  91         .bNumConfigurations     = 0, /* dynamic */
  92 };
  93
  94 DECLARE_UVC_HEADER_DESCRIPTOR(1);
  95
  96 static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
  97         .bLength                = UVC_DT_HEADER_SIZE(1),
  98         .bDescriptorType        = USB_DT_CS_INTERFACE,
  99         .bDescriptorSubType     = UVC_VC_HEADER,
 100         .bcdUVC                 = cpu_to_le16(0x0100),
 101         .wTotalLength           = 0, /* dynamic */
 102         .dwClockFrequency       = cpu_to_le32(48000000),
 103         .bInCollection          = 0, /* dynamic */
 104         .baInterfaceNr[0]       = 0, /* dynamic */
 105 };
 106
 107 static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
 108         .bLength                = UVC_DT_CAMERA_TERMINAL_SIZE(3),
 109         .bDescriptorType        = USB_DT_CS_INTERFACE,
 110         .bDescriptorSubType     = UVC_VC_INPUT_TERMINAL,
 111         .bTerminalID            = 1,
 112         .wTerminalType          = cpu_to_le16(0x0201),
 113         .bAssocTerminal         = 0,
 114         .iTerminal              = 0,
 115         .wObjectiveFocalLengthMin       = cpu_to_le16(0),
 116         .wObjectiveFocalLengthMax       = cpu_to_le16(0),
 117         .wOcularFocalLength             = cpu_to_le16(0),
 118         .bControlSize           = 3,
 119         .bmControls[0]          = 2,
 120         .bmControls[1]          = 0,
 121         .bmControls[2]          = 0,
 122 };
 123
 124 static const struct uvc_processing_unit_descriptor uvc_processing = {
 125         .bLength                = UVC_DT_PROCESSING_UNIT_SIZE(2),
 126         .bDescriptorType        = USB_DT_CS_INTERFACE,
 127         .bDescriptorSubType     = UVC_VC_PROCESSING_UNIT,
 128         .bUnitID                = 2,
 129         .bSourceID              = 1,
 130         .wMaxMultiplier         = cpu_to_le16(16*1024),
 131         .bControlSize           = 2,
 132         .bmControls[0]          = 1,
 133         .bmControls[1]          = 0,
 134         .iProcessing            = 0,
 135 };
 136
 137 static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
 138         .bLength                = UVC_DT_OUTPUT_TERMINAL_SIZE,
 139         .bDescriptorType        = USB_DT_CS_INTERFACE,
 140         .bDescriptorSubType     = UVC_VC_OUTPUT_TERMINAL,
 141         .bTerminalID            = 3,
 142         .wTerminalType          = cpu_to_le16(0x0101),
 143         .bAssocTerminal         = 0,
 144         .bSourceID              = 2,
 145         .iTerminal              = 0,
 146 };
 147
 148 DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);
 149
 150 static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
 151         .bLength                = UVC_DT_INPUT_HEADER_SIZE(1, 2),
 152         .bDescriptorType        = USB_DT_CS_INTERFACE,
 153         .bDescriptorSubType     = UVC_VS_INPUT_HEADER,
 154         .bNumFormats            = 2,
 155         .wTotalLength           = 0, /* dynamic */
 156         .bEndpointAddress       = 0, /* dynamic */
 157         .bmInfo                 = 0,
 158         .bTerminalLink          = 3,
 159         .bStillCaptureMethod    = 0,
 160         .bTriggerSupport        = 0,
 161         .bTriggerUsage          = 0,
 162         .bControlSize           = 1,
 163         .bmaControls[0][0]      = 0,
 164         .bmaControls[1][0]      = 4,
 165 };
 166
 167 static const struct uvc_format_uncompressed uvc_format_yuv = {
 168         .bLength                = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
 169         .bDescriptorType        = USB_DT_CS_INTERFACE,
 170         .bDescriptorSubType     = UVC_VS_FORMAT_UNCOMPRESSED,
 171         .bFormatIndex           = 1,
 172         .bNumFrameDescriptors   = 2,
 173         .guidFormat             =
 174                 { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00,
 175                  0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
 176         .bBitsPerPixel          = 16,
 177         .bDefaultFrameIndex     = 1,
 178         .bAspectRatioX          = 0,
 179         .bAspectRatioY          = 0,
 180         .bmInterfaceFlags       = 0,
 181         .bCopyProtect           = 0,
 182 };
 183
 184 DECLARE_UVC_FRAME_UNCOMPRESSED(1);
 185 DECLARE_UVC_FRAME_UNCOMPRESSED(3);
 186
 187 static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
 188         .bLength                = UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
 189         .bDescriptorType        = USB_DT_CS_INTERFACE,
 190         .bDescriptorSubType     = UVC_VS_FRAME_UNCOMPRESSED,
 191         .bFrameIndex            = 1,
 192         .bmCapabilities         = 0,
 193         .wWidth                 = cpu_to_le16(640),
 194         .wHeight                = cpu_to_le16(360),
 195         .dwMinBitRate           = cpu_to_le32(18432000),
 196         .dwMaxBitRate           = cpu_to_le32(55296000),
 197         .dwMaxVideoFrameBufferSize      = cpu_to_le32(460800),
 198         .dwDefaultFrameInterval = cpu_to_le32(666666),
 199         .bFrameIntervalType     = 3,
 200         .dwFrameInterval[0]     = cpu_to_le32(666666),
 201         .dwFrameInterval[1]     = cpu_to_le32(1000000),
 202         .dwFrameInterval[2]     = cpu_to_le32(5000000),
 203 };
 204
 205 static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
 206         .bLength                = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
 207         .bDescriptorType        = USB_DT_CS_INTERFACE,
 208         .bDescriptorSubType     = UVC_VS_FRAME_UNCOMPRESSED,
 209         .bFrameIndex            = 2,
 210         .bmCapabilities         = 0,
 211         .wWidth                 = cpu_to_le16(1280),
 212         .wHeight                = cpu_to_le16(720),
 213         .dwMinBitRate           = cpu_to_le32(29491200),
 214         .dwMaxBitRate           = cpu_to_le32(29491200),
 215         .dwMaxVideoFrameBufferSize      = cpu_to_le32(1843200),
 216         .dwDefaultFrameInterval = cpu_to_le32(5000000),
 217         .bFrameIntervalType     = 1,
 218         .dwFrameInterval[0]     = cpu_to_le32(5000000),
 219 };
 220
 221 static const struct uvc_format_mjpeg uvc_format_mjpg = {
 222         .bLength                = UVC_DT_FORMAT_MJPEG_SIZE,
 223         .bDescriptorType        = USB_DT_CS_INTERFACE,
 224         .bDescriptorSubType     = UVC_VS_FORMAT_MJPEG,
 225         .bFormatIndex           = 2,
 226         .bNumFrameDescriptors   = 2,
 227         .bmFlags                = 0,
 228         .bDefaultFrameIndex     = 1,
 229         .bAspectRatioX          = 0,
 230         .bAspectRatioY          = 0,
 231         .bmInterfaceFlags       = 0,
 232         .bCopyProtect           = 0,
 233 };
 234
 235 DECLARE_UVC_FRAME_MJPEG(1);
 236 DECLARE_UVC_FRAME_MJPEG(3);
 237
 238 static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
 239         .bLength                = UVC_DT_FRAME_MJPEG_SIZE(3),
 240         .bDescriptorType        = USB_DT_CS_INTERFACE,
 241         .bDescriptorSubType     = UVC_VS_FRAME_MJPEG,
 242         .bFrameIndex            = 1,
 243         .bmCapabilities         = 0,
 244         .wWidth                 = cpu_to_le16(640),
 245         .wHeight                = cpu_to_le16(360),
 246         .dwMinBitRate           = cpu_to_le32(18432000),
 247         .dwMaxBitRate           = cpu_to_le32(55296000),
 248         .dwMaxVideoFrameBufferSize      = cpu_to_le32(460800),
 249         .dwDefaultFrameInterval = cpu_to_le32(666666),
 250         .bFrameIntervalType     = 3,
 251         .dwFrameInterval[0]     = cpu_to_le32(666666),
 252         .dwFrameInterval[1]     = cpu_to_le32(1000000),
 253         .dwFrameInterval[2]     = cpu_to_le32(5000000),
 254 };
 255
 256 static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
 257         .bLength                = UVC_DT_FRAME_MJPEG_SIZE(1),
 258         .bDescriptorType        = USB_DT_CS_INTERFACE,
 259         .bDescriptorSubType     = UVC_VS_FRAME_MJPEG,
 260         .bFrameIndex            = 2,
 261         .bmCapabilities         = 0,
 262         .wWidth                 = cpu_to_le16(1280),
 263         .wHeight                = cpu_to_le16(720),
 264         .dwMinBitRate           = cpu_to_le32(29491200),
 265         .dwMaxBitRate           = cpu_to_le32(29491200),
 266         .dwMaxVideoFrameBufferSize      = cpu_to_le32(1843200),
 267         .dwDefaultFrameInterval = cpu_to_le32(5000000),
 268         .bFrameIntervalType     = 1,
 269         .dwFrameInterval[0]     = cpu_to_le32(5000000),
 270 };
 271
 272 static const struct uvc_color_matching_descriptor uvc_color_matching = {
 273         .bLength                = UVC_DT_COLOR_MATCHING_SIZE,
 274         .bDescriptorType        = USB_DT_CS_INTERFACE,
 275         .bDescriptorSubType     = UVC_VS_COLORFORMAT,
 276         .bColorPrimaries        = 1,
 277         .bTransferCharacteristics       = 1,
 278         .bMatrixCoefficients    = 4,
 279 };
 280
 281 static const struct uvc_descriptor_header * const uvc_fs_control_cls[] = {
 282         (const struct uvc_descriptor_header *) &uvc_control_header,
 283         (const struct uvc_descriptor_header *) &uvc_camera_terminal,
 284         (const struct uvc_descriptor_header *) &uvc_processing,
 285         (const struct uvc_descriptor_header *) &uvc_output_terminal,
 286         NULL,
 287 };
 288
 289 static const struct uvc_descriptor_header * const uvc_ss_control_cls[] = {
 290         (const struct uvc_descriptor_header *) &uvc_control_header,
 291         (const struct uvc_descriptor_header *) &uvc_camera_terminal,
 292         (const struct uvc_descriptor_header *) &uvc_processing,
 293         (const struct uvc_descriptor_header *) &uvc_output_terminal,
 294         NULL,
 295 };
 296
 297 static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
 298         (const struct uvc_descriptor_header *) &uvc_input_header,
 299         (const struct uvc_descriptor_header *) &uvc_format_yuv,
 300         (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
 301         (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
 302         (const struct uvc_descriptor_header *) &uvc_format_mjpg,
 303         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
 304         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
 305         (const struct uvc_descriptor_header *) &uvc_color_matching,
 306         NULL,
 307 };
 308
 309 static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
 310         (const struct uvc_descriptor_header *) &uvc_input_header,
 311         (const struct uvc_descriptor_header *) &uvc_format_yuv,
 312         (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
 313         (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
 314         (const struct uvc_descriptor_header *) &uvc_format_mjpg,
 315         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
 316         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
 317         (const struct uvc_descriptor_header *) &uvc_color_matching,
 318         NULL,
 319 };
 320
 321 static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
 322         (const struct uvc_descriptor_header *) &uvc_input_header,
 323         (const struct uvc_descriptor_header *) &uvc_format_yuv,
 324         (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
 325         (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
 326         (const struct uvc_descriptor_header *) &uvc_format_mjpg,
 327         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
 328         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
 329         (const struct uvc_descriptor_header *) &uvc_color_matching,
 330         NULL,
 331 };
 332
 333 /* --------------------------------------------------------------------------
 334  * USB configuration
 335  */
 336
 337 static int
 338 webcam_config_bind(struct usb_configuration *c)
 339 {
 340         int status = 0;
 341
 342         f_uvc = usb_get_function(fi_uvc);
 343         if (IS_ERR(f_uvc))
 344                 return PTR_ERR(f_uvc);
 345
 346         status = usb_add_function(c, f_uvc);
 347         if (status < 0)
 348                 usb_put_function(f_uvc);
 349
 350         return status;
 351 }
 352
 353 static struct usb_configuration webcam_config_driver = {
 354         .label                  = webcam_config_label,
 355         .bConfigurationValue    = 1,
 356         .iConfiguration         = 0, /* dynamic */
 357         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 358         .MaxPower               = CONFIG_USB_GADGET_VBUS_DRAW,
 359 };
 360
 361 static int
 362 webcam_unbind(struct usb_composite_dev *cdev)
 363 {
 364         if (!IS_ERR_OR_NULL(f_uvc))
 365                 usb_put_function(f_uvc);
 366         if (!IS_ERR_OR_NULL(fi_uvc))
 367                 usb_put_function_instance(fi_uvc);
 368         return 0;
 369 }
 370
 371 static int
 372 webcam_bind(struct usb_composite_dev *cdev)
 373 {
 374         struct f_uvc_opts *uvc_opts;
 375         int ret;
 376
 377         fi_uvc = usb_get_function_instance("uvc");
 378         if (IS_ERR(fi_uvc))
 379                 return PTR_ERR(fi_uvc);
 380
 381         uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);
 382
 383         uvc_opts->streaming_interval = streaming_interval;
 384         uvc_opts->streaming_maxpacket = streaming_maxpacket;
 385         uvc_opts->streaming_maxburst = streaming_maxburst;
 386         uvc_set_trace_param(trace);
 387
 388         uvc_opts->fs_control = uvc_fs_control_cls;
 389         uvc_opts->ss_control = uvc_ss_control_cls;
 390         uvc_opts->fs_streaming = uvc_fs_streaming_cls;
 391         uvc_opts->hs_streaming = uvc_hs_streaming_cls;
 392         uvc_opts->ss_streaming = uvc_ss_streaming_cls;
 393
 394         /* Allocate string descriptor numbers ... note that string contents
 395          * can be overridden by the composite_dev glue.
 396          */
 397         ret = usb_string_ids_tab(cdev, webcam_strings);
 398         if (ret < 0)
 399                 goto error;
 400         webcam_device_descriptor.iManufacturer =
 401                 webcam_strings[USB_GADGET_MANUFACTURER_IDX].id;
 402         webcam_device_descriptor.iProduct =
 403                 webcam_strings[USB_GADGET_PRODUCT_IDX].id;
 404         webcam_config_driver.iConfiguration =
 405                 webcam_strings[STRING_DESCRIPTION_IDX].id;
 406
 407         /* Register our configuration. */
 408         if ((ret = usb_add_config(cdev, &webcam_config_driver,
 409                                         webcam_config_bind)) < 0)
 410                 goto error;
 411
 412         usb_composite_overwrite_options(cdev, &coverwrite);
 413         INFO(cdev, "Webcam Video Gadget\n");
 414         return 0;
 415
 416 error:
 417         usb_put_function_instance(fi_uvc);
 418         return ret;
 419 }
 420
 421 /* --------------------------------------------------------------------------
 422  * Driver
 423  */
 424
 425 static struct usb_composite_driver webcam_driver = {
 426         .name           = "g_webcam",
 427         .dev            = &webcam_device_descriptor,
 428         .strings        = webcam_device_strings,
 429         .max_speed      = USB_SPEED_SUPER,
 430         .bind           = webcam_bind,
 431         .unbind         = webcam_unbind,
 432 };
 433
 434 module_usb_composite_driver(webcam_driver);
 435
 436 MODULE_AUTHOR("Laurent Pinchart");
 437 MODULE_DESCRIPTION("Webcam Video Gadget");
 438 MODULE_LICENSE("GPL");
 439 MODULE_VERSION("0.1.0");
 440