drivers/usb/gadget/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/usb/video.h>
  16
  17 #include "f_uvc.h"
  18
  19 /*
  20  * Kbuild is not very cooperative with respect to linking separately
  21  * compiled library objects into one module.  So for now we won't use
  22  * separate compilation ... ensuring init/exit sections work to shrink
  23  * the runtime footprint, and giving us at least some parts of what
  24  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  25  */
  26 #include "composite.c"
  27 #include "usbstring.c"
  28 #include "config.c"
  29 #include "epautoconf.c"
  30
  31 #include "uvc_queue.c"
  32 #include "uvc_video.c"
  33 #include "uvc_v4l2.c"
  34 #include "f_uvc.c"
  35
  36 /* --------------------------------------------------------------------------
  37  * Device descriptor
  38  */
  39
  40 #define WEBCAM_VENDOR_ID                0x1d6b  /* Linux Foundation */
  41 #define WEBCAM_PRODUCT_ID               0x0102  /* Webcam A/V gadget */
  42 #define WEBCAM_DEVICE_BCD               0x0010  /* 0.10 */
  43
  44 static char webcam_vendor_label[] = "Linux Foundation";
  45 static char webcam_product_label[] = "Webcam gadget";
  46 static char webcam_config_label[] = "Video";
  47
  48 /* string IDs are assigned dynamically */
  49
  50 #define STRING_MANUFACTURER_IDX         0
  51 #define STRING_PRODUCT_IDX              1
  52 #define STRING_DESCRIPTION_IDX          2
  53
  54 static struct usb_string webcam_strings[] = {
  55         [STRING_MANUFACTURER_IDX].s = webcam_vendor_label,
  56         [STRING_PRODUCT_IDX].s = webcam_product_label,
  57         [STRING_DESCRIPTION_IDX].s = webcam_config_label,
  58         {  }
  59 };
  60
  61 static struct usb_gadget_strings webcam_stringtab = {
  62         .language = 0x0409,     /* en-us */
  63         .strings = webcam_strings,
  64 };
  65
  66 static struct usb_gadget_strings *webcam_device_strings[] = {
  67         &webcam_stringtab,
  68         NULL,
  69 };
  70
  71 static struct usb_device_descriptor webcam_device_descriptor = {
  72         .bLength                = USB_DT_DEVICE_SIZE,
  73         .bDescriptorType        = USB_DT_DEVICE,
  74         .bcdUSB                 = cpu_to_le16(0x0200),
  75         .bDeviceClass           = USB_CLASS_MISC,
  76         .bDeviceSubClass        = 0x02,
  77         .bDeviceProtocol        = 0x01,
  78         .bMaxPacketSize0        = 0, /* dynamic */
  79         .idVendor               = cpu_to_le16(WEBCAM_VENDOR_ID),
  80         .idProduct              = cpu_to_le16(WEBCAM_PRODUCT_ID),
  81         .bcdDevice              = cpu_to_le16(WEBCAM_DEVICE_BCD),
  82         .iManufacturer          = 0, /* dynamic */
  83         .iProduct               = 0, /* dynamic */
  84         .iSerialNumber          = 0, /* dynamic */
  85         .bNumConfigurations     = 0, /* dynamic */
  86 };
  87
  88 DECLARE_UVC_HEADER_DESCRIPTOR(1);
  89
  90 static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
  91         .bLength                = UVC_DT_HEADER_SIZE(1),
  92         .bDescriptorType        = USB_DT_CS_INTERFACE,
  93         .bDescriptorSubType     = UVC_VC_HEADER,
  94         .bcdUVC                 = cpu_to_le16(0x0100),
  95         .wTotalLength           = 0, /* dynamic */
  96         .dwClockFrequency       = cpu_to_le32(48000000),
  97         .bInCollection          = 0, /* dynamic */
  98         .baInterfaceNr[0]       = 0, /* dynamic */
  99 };
 100
 101 static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
 102         .bLength                = UVC_DT_CAMERA_TERMINAL_SIZE(3),
 103         .bDescriptorType        = USB_DT_CS_INTERFACE,
 104         .bDescriptorSubType     = UVC_VC_INPUT_TERMINAL,
 105         .bTerminalID            = 1,
 106         .wTerminalType          = cpu_to_le16(0x0201),
 107         .bAssocTerminal         = 0,
 108         .iTerminal              = 0,
 109         .wObjectiveFocalLengthMin       = cpu_to_le16(0),
 110         .wObjectiveFocalLengthMax       = cpu_to_le16(0),
 111         .wOcularFocalLength             = cpu_to_le16(0),
 112         .bControlSize           = 3,
 113         .bmControls[0]          = 2,
 114         .bmControls[1]          = 0,
 115         .bmControls[2]          = 0,
 116 };
 117
 118 static const struct uvc_processing_unit_descriptor uvc_processing = {
 119         .bLength                = UVC_DT_PROCESSING_UNIT_SIZE(2),
 120         .bDescriptorType        = USB_DT_CS_INTERFACE,
 121         .bDescriptorSubType     = UVC_VC_PROCESSING_UNIT,
 122         .bUnitID                = 2,
 123         .bSourceID              = 1,
 124         .wMaxMultiplier         = cpu_to_le16(16*1024),
 125         .bControlSize           = 2,
 126         .bmControls[0]          = 1,
 127         .bmControls[1]          = 0,
 128         .iProcessing            = 0,
 129 };
 130
 131 static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
 132         .bLength                = UVC_DT_OUTPUT_TERMINAL_SIZE,
 133         .bDescriptorType        = USB_DT_CS_INTERFACE,
 134         .bDescriptorSubType     = UVC_VC_OUTPUT_TERMINAL,
 135         .bTerminalID            = 3,
 136         .wTerminalType          = cpu_to_le16(0x0101),
 137         .bAssocTerminal         = 0,
 138         .bSourceID              = 2,
 139         .iTerminal              = 0,
 140 };
 141
 142 DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);
 143
 144 static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
 145         .bLength                = UVC_DT_INPUT_HEADER_SIZE(1, 2),
 146         .bDescriptorType        = USB_DT_CS_INTERFACE,
 147         .bDescriptorSubType     = UVC_VS_INPUT_HEADER,
 148         .bNumFormats            = 2,
 149         .wTotalLength           = 0, /* dynamic */
 150         .bEndpointAddress       = 0, /* dynamic */
 151         .bmInfo                 = 0,
 152         .bTerminalLink          = 3,
 153         .bStillCaptureMethod    = 0,
 154         .bTriggerSupport        = 0,
 155         .bTriggerUsage          = 0,
 156         .bControlSize           = 1,
 157         .bmaControls[0][0]      = 0,
 158         .bmaControls[1][0]      = 4,
 159 };
 160
 161 static const struct uvc_format_uncompressed uvc_format_yuv = {
 162         .bLength                = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
 163         .bDescriptorType        = USB_DT_CS_INTERFACE,
 164         .bDescriptorSubType     = UVC_VS_FORMAT_UNCOMPRESSED,
 165         .bFormatIndex           = 1,
 166         .bNumFrameDescriptors   = 2,
 167         .guidFormat             =
 168                 { 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00,
 169                  0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
 170         .bBitsPerPixel          = 16,
 171         .bDefaultFrameIndex     = 1,
 172         .bAspectRatioX          = 0,
 173         .bAspectRatioY          = 0,
 174         .bmInterfaceFlags       = 0,
 175         .bCopyProtect           = 0,
 176 };
 177
 178 DECLARE_UVC_FRAME_UNCOMPRESSED(1);
 179 DECLARE_UVC_FRAME_UNCOMPRESSED(3);
 180
 181 static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
 182         .bLength                = UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
 183         .bDescriptorType        = USB_DT_CS_INTERFACE,
 184         .bDescriptorSubType     = UVC_VS_FRAME_UNCOMPRESSED,
 185         .bFrameIndex            = 1,
 186         .bmCapabilities         = 0,
 187         .wWidth                 = cpu_to_le16(640),
 188         .wHeight                = cpu_to_le16(360),
 189         .dwMinBitRate           = cpu_to_le32(18432000),
 190         .dwMaxBitRate           = cpu_to_le32(55296000),
 191         .dwMaxVideoFrameBufferSize      = cpu_to_le32(460800),
 192         .dwDefaultFrameInterval = cpu_to_le32(666666),
 193         .bFrameIntervalType     = 3,
 194         .dwFrameInterval[0]     = cpu_to_le32(666666),
 195         .dwFrameInterval[1]     = cpu_to_le32(1000000),
 196         .dwFrameInterval[2]     = cpu_to_le32(5000000),
 197 };
 198
 199 static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
 200         .bLength                = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
 201         .bDescriptorType        = USB_DT_CS_INTERFACE,
 202         .bDescriptorSubType     = UVC_VS_FRAME_UNCOMPRESSED,
 203         .bFrameIndex            = 2,
 204         .bmCapabilities         = 0,
 205         .wWidth                 = cpu_to_le16(1280),
 206         .wHeight                = cpu_to_le16(720),
 207         .dwMinBitRate           = cpu_to_le32(29491200),
 208         .dwMaxBitRate           = cpu_to_le32(29491200),
 209         .dwMaxVideoFrameBufferSize      = cpu_to_le32(1843200),
 210         .dwDefaultFrameInterval = cpu_to_le32(5000000),
 211         .bFrameIntervalType     = 1,
 212         .dwFrameInterval[0]     = cpu_to_le32(5000000),
 213 };
 214
 215 static const struct uvc_format_mjpeg uvc_format_mjpg = {
 216         .bLength                = UVC_DT_FORMAT_MJPEG_SIZE,
 217         .bDescriptorType        = USB_DT_CS_INTERFACE,
 218         .bDescriptorSubType     = UVC_VS_FORMAT_MJPEG,
 219         .bFormatIndex           = 2,
 220         .bNumFrameDescriptors   = 2,
 221         .bmFlags                = 0,
 222         .bDefaultFrameIndex     = 1,
 223         .bAspectRatioX          = 0,
 224         .bAspectRatioY          = 0,
 225         .bmInterfaceFlags       = 0,
 226         .bCopyProtect           = 0,
 227 };
 228
 229 DECLARE_UVC_FRAME_MJPEG(1);
 230 DECLARE_UVC_FRAME_MJPEG(3);
 231
 232 static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
 233         .bLength                = UVC_DT_FRAME_MJPEG_SIZE(3),
 234         .bDescriptorType        = USB_DT_CS_INTERFACE,
 235         .bDescriptorSubType     = UVC_VS_FRAME_MJPEG,
 236         .bFrameIndex            = 1,
 237         .bmCapabilities         = 0,
 238         .wWidth                 = cpu_to_le16(640),
 239         .wHeight                = cpu_to_le16(360),
 240         .dwMinBitRate           = cpu_to_le32(18432000),
 241         .dwMaxBitRate           = cpu_to_le32(55296000),
 242         .dwMaxVideoFrameBufferSize      = cpu_to_le32(460800),
 243         .dwDefaultFrameInterval = cpu_to_le32(666666),
 244         .bFrameIntervalType     = 3,
 245         .dwFrameInterval[0]     = cpu_to_le32(666666),
 246         .dwFrameInterval[1]     = cpu_to_le32(1000000),
 247         .dwFrameInterval[2]     = cpu_to_le32(5000000),
 248 };
 249
 250 static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
 251         .bLength                = UVC_DT_FRAME_MJPEG_SIZE(1),
 252         .bDescriptorType        = USB_DT_CS_INTERFACE,
 253         .bDescriptorSubType     = UVC_VS_FRAME_MJPEG,
 254         .bFrameIndex            = 2,
 255         .bmCapabilities         = 0,
 256         .wWidth                 = cpu_to_le16(1280),
 257         .wHeight                = cpu_to_le16(720),
 258         .dwMinBitRate           = cpu_to_le32(29491200),
 259         .dwMaxBitRate           = cpu_to_le32(29491200),
 260         .dwMaxVideoFrameBufferSize      = cpu_to_le32(1843200),
 261         .dwDefaultFrameInterval = cpu_to_le32(5000000),
 262         .bFrameIntervalType     = 1,
 263         .dwFrameInterval[0]     = cpu_to_le32(5000000),
 264 };
 265
 266 static const struct uvc_color_matching_descriptor uvc_color_matching = {
 267         .bLength                = UVC_DT_COLOR_MATCHING_SIZE,
 268         .bDescriptorType        = USB_DT_CS_INTERFACE,
 269         .bDescriptorSubType     = UVC_VS_COLORFORMAT,
 270         .bColorPrimaries        = 1,
 271         .bTransferCharacteristics       = 1,
 272         .bMatrixCoefficients    = 4,
 273 };
 274
 275 static const struct uvc_descriptor_header * const uvc_control_cls[] = {
 276         (const struct uvc_descriptor_header *) &uvc_control_header,
 277         (const struct uvc_descriptor_header *) &uvc_camera_terminal,
 278         (const struct uvc_descriptor_header *) &uvc_processing,
 279         (const struct uvc_descriptor_header *) &uvc_output_terminal,
 280         NULL,
 281 };
 282
 283 static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
 284         (const struct uvc_descriptor_header *) &uvc_input_header,
 285         (const struct uvc_descriptor_header *) &uvc_format_yuv,
 286         (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
 287         (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
 288         (const struct uvc_descriptor_header *) &uvc_format_mjpg,
 289         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
 290         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
 291         (const struct uvc_descriptor_header *) &uvc_color_matching,
 292         NULL,
 293 };
 294
 295 static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
 296         (const struct uvc_descriptor_header *) &uvc_input_header,
 297         (const struct uvc_descriptor_header *) &uvc_format_yuv,
 298         (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
 299         (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
 300         (const struct uvc_descriptor_header *) &uvc_format_mjpg,
 301         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
 302         (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
 303         (const struct uvc_descriptor_header *) &uvc_color_matching,
 304         NULL,
 305 };
 306
 307 /* --------------------------------------------------------------------------
 308  * USB configuration
 309  */
 310
 311 static int __init
 312 webcam_config_bind(struct usb_configuration *c)
 313 {
 314         return uvc_bind_config(c, uvc_control_cls, uvc_fs_streaming_cls,
 315                                uvc_hs_streaming_cls);
 316 }
 317
 318 static struct usb_configuration webcam_config_driver = {
 319         .label                  = webcam_config_label,
 320         .bConfigurationValue    = 1,
 321         .iConfiguration         = 0, /* dynamic */
 322         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 323         .bMaxPower              = CONFIG_USB_GADGET_VBUS_DRAW / 2,
 324 };
 325
 326 static int /* __init_or_exit */
 327 webcam_unbind(struct usb_composite_dev *cdev)
 328 {
 329         return 0;
 330 }
 331
 332 static int __init
 333 webcam_bind(struct usb_composite_dev *cdev)
 334 {
 335         int ret;
 336
 337         /* Allocate string descriptor numbers ... note that string contents
 338          * can be overridden by the composite_dev glue.
 339          */
 340         if ((ret = usb_string_id(cdev)) < 0)
 341                 goto error;
 342         webcam_strings[STRING_MANUFACTURER_IDX].id = ret;
 343         webcam_device_descriptor.iManufacturer = ret;
 344
 345         if ((ret = usb_string_id(cdev)) < 0)
 346                 goto error;
 347         webcam_strings[STRING_PRODUCT_IDX].id = ret;
 348         webcam_device_descriptor.iProduct = ret;
 349
 350         if ((ret = usb_string_id(cdev)) < 0)
 351                 goto error;
 352         webcam_strings[STRING_DESCRIPTION_IDX].id = ret;
 353         webcam_config_driver.iConfiguration = ret;
 354
 355         /* Register our configuration. */
 356         if ((ret = usb_add_config(cdev, &webcam_config_driver,
 357                                         webcam_config_bind)) < 0)
 358                 goto error;
 359
 360         INFO(cdev, "Webcam Video Gadget\n");
 361         return 0;
 362
 363 error:
 364         webcam_unbind(cdev);
 365         return ret;
 366 }
 367
 368 /* --------------------------------------------------------------------------
 369  * Driver
 370  */
 371
 372 static struct usb_composite_driver webcam_driver = {
 373         .name           = "g_webcam",
 374         .dev            = &webcam_device_descriptor,
 375         .strings        = webcam_device_strings,
 376         .unbind         = webcam_unbind,
 377 };
 378
 379 static int __init
 380 webcam_init(void)
 381 {
 382         return usb_composite_probe(&webcam_driver, webcam_bind);
 383 }
 384
 385 static void __exit
 386 webcam_cleanup(void)
 387 {
 388         usb_composite_unregister(&webcam_driver);
 389 }
 390
 391 module_init(webcam_init);
 392 module_exit(webcam_cleanup);
 393
 394 MODULE_AUTHOR("Laurent Pinchart");
 395 MODULE_DESCRIPTION("Webcam Video Gadget");
 396 MODULE_LICENSE("GPL");
 397 MODULE_VERSION("0.1.0");
 398