Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 1 | /* |
| 2 | * uvc_video.c -- USB Video Class driver - Video handling |
| 3 | * |
| 4 | * Copyright (C) 2005-2008 |
| 5 | * Laurent Pinchart (laurent.pinchart@skynet.be) |
| 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 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/version.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/usb.h> |
| 19 | #include <linux/videodev2.h> |
| 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <asm/atomic.h> |
| 23 | #include <asm/unaligned.h> |
| 24 | |
| 25 | #include <media/v4l2-common.h> |
| 26 | |
| 27 | #include "uvcvideo.h" |
| 28 | |
| 29 | /* ------------------------------------------------------------------------ |
| 30 | * UVC Controls |
| 31 | */ |
| 32 | |
| 33 | static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, |
| 34 | __u8 intfnum, __u8 cs, void *data, __u16 size, |
| 35 | int timeout) |
| 36 | { |
| 37 | __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE; |
| 38 | unsigned int pipe; |
| 39 | int ret; |
| 40 | |
| 41 | pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) |
| 42 | : usb_sndctrlpipe(dev->udev, 0); |
| 43 | type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; |
| 44 | |
| 45 | ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
| 46 | unit << 8 | intfnum, data, size, timeout); |
| 47 | |
| 48 | if (ret != size) { |
| 49 | uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " |
| 50 | "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, |
| 51 | size); |
| 52 | return -EIO; |
| 53 | } |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, |
| 59 | __u8 intfnum, __u8 cs, void *data, __u16 size) |
| 60 | { |
| 61 | return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
| 62 | UVC_CTRL_CONTROL_TIMEOUT); |
| 63 | } |
| 64 | |
| 65 | static void uvc_fixup_buffer_size(struct uvc_video_device *video, |
| 66 | struct uvc_streaming_control *ctrl) |
| 67 | { |
| 68 | struct uvc_format *format; |
| 69 | struct uvc_frame *frame; |
| 70 | |
| 71 | if (ctrl->bFormatIndex <= 0 || |
| 72 | ctrl->bFormatIndex > video->streaming->nformats) |
| 73 | return; |
| 74 | |
| 75 | format = &video->streaming->format[ctrl->bFormatIndex - 1]; |
| 76 | |
| 77 | if (ctrl->bFrameIndex <= 0 || |
| 78 | ctrl->bFrameIndex > format->nframes) |
| 79 | return; |
| 80 | |
| 81 | frame = &format->frame[ctrl->bFrameIndex - 1]; |
| 82 | |
| 83 | if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || |
| 84 | (ctrl->dwMaxVideoFrameSize == 0 && |
| 85 | video->dev->uvc_version < 0x0110)) |
| 86 | ctrl->dwMaxVideoFrameSize = |
| 87 | frame->dwMaxVideoFrameBufferSize; |
| 88 | } |
| 89 | |
| 90 | static int uvc_get_video_ctrl(struct uvc_video_device *video, |
| 91 | struct uvc_streaming_control *ctrl, int probe, __u8 query) |
| 92 | { |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 93 | __u8 *data; |
| 94 | __u16 size; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 95 | int ret; |
| 96 | |
| 97 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 98 | data = kmalloc(size, GFP_KERNEL); |
| 99 | if (data == NULL) |
| 100 | return -ENOMEM; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 101 | |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 102 | ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum, |
| 103 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
| 104 | UVC_CTRL_STREAMING_TIMEOUT); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 105 | if (ret < 0) |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 106 | goto out; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 107 | |
| 108 | ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); |
| 109 | ctrl->bFormatIndex = data[2]; |
| 110 | ctrl->bFrameIndex = data[3]; |
| 111 | ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]); |
| 112 | ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]); |
| 113 | ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]); |
| 114 | ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]); |
| 115 | ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]); |
| 116 | ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]); |
| 117 | ctrl->dwMaxVideoFrameSize = |
| 118 | le32_to_cpu(get_unaligned((__le32 *)&data[18])); |
| 119 | ctrl->dwMaxPayloadTransferSize = |
| 120 | le32_to_cpu(get_unaligned((__le32 *)&data[22])); |
| 121 | |
| 122 | if (size == 34) { |
| 123 | ctrl->dwClockFrequency = |
| 124 | le32_to_cpu(get_unaligned((__le32 *)&data[26])); |
| 125 | ctrl->bmFramingInfo = data[30]; |
| 126 | ctrl->bPreferedVersion = data[31]; |
| 127 | ctrl->bMinVersion = data[32]; |
| 128 | ctrl->bMaxVersion = data[33]; |
| 129 | } else { |
| 130 | ctrl->dwClockFrequency = video->dev->clock_frequency; |
| 131 | ctrl->bmFramingInfo = 0; |
| 132 | ctrl->bPreferedVersion = 0; |
| 133 | ctrl->bMinVersion = 0; |
| 134 | ctrl->bMaxVersion = 0; |
| 135 | } |
| 136 | |
| 137 | /* Some broken devices return a null or wrong dwMaxVideoFrameSize. |
| 138 | * Try to get the value from the format and frame descriptor. |
| 139 | */ |
| 140 | uvc_fixup_buffer_size(video, ctrl); |
| 141 | |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 142 | out: |
| 143 | kfree(data); |
| 144 | return ret; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | int uvc_set_video_ctrl(struct uvc_video_device *video, |
| 148 | struct uvc_streaming_control *ctrl, int probe) |
| 149 | { |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 150 | __u8 *data; |
| 151 | __u16 size; |
| 152 | int ret; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 153 | |
| 154 | size = video->dev->uvc_version >= 0x0110 ? 34 : 26; |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 155 | data = kzalloc(size, GFP_KERNEL); |
| 156 | if (data == NULL) |
| 157 | return -ENOMEM; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 158 | |
| 159 | *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint); |
| 160 | data[2] = ctrl->bFormatIndex; |
| 161 | data[3] = ctrl->bFrameIndex; |
| 162 | *(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval); |
| 163 | *(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate); |
| 164 | *(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate); |
| 165 | *(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality); |
| 166 | *(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize); |
| 167 | *(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay); |
| 168 | /* Note: Some of the fields below are not required for IN devices (see |
| 169 | * UVC spec, 4.3.1.1), but we still copy them in case support for OUT |
| 170 | * devices is added in the future. */ |
| 171 | put_unaligned(cpu_to_le32(ctrl->dwMaxVideoFrameSize), |
| 172 | (__le32 *)&data[18]); |
| 173 | put_unaligned(cpu_to_le32(ctrl->dwMaxPayloadTransferSize), |
| 174 | (__le32 *)&data[22]); |
| 175 | |
| 176 | if (size == 34) { |
| 177 | put_unaligned(cpu_to_le32(ctrl->dwClockFrequency), |
| 178 | (__le32 *)&data[26]); |
| 179 | data[30] = ctrl->bmFramingInfo; |
| 180 | data[31] = ctrl->bPreferedVersion; |
| 181 | data[32] = ctrl->bMinVersion; |
| 182 | data[33] = ctrl->bMaxVersion; |
| 183 | } |
| 184 | |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 185 | ret = __uvc_query_ctrl(video->dev, SET_CUR, 0, |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 186 | video->streaming->intfnum, |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 187 | probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 188 | UVC_CTRL_STREAMING_TIMEOUT); |
Laurent Pinchart | 04793dd | 2008-07-31 17:11:12 -0300 | [diff] [blame] | 189 | |
| 190 | kfree(data); |
| 191 | return ret; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | int uvc_probe_video(struct uvc_video_device *video, |
| 195 | struct uvc_streaming_control *probe) |
| 196 | { |
| 197 | struct uvc_streaming_control probe_min, probe_max; |
| 198 | __u16 bandwidth; |
| 199 | unsigned int i; |
| 200 | int ret; |
| 201 | |
| 202 | mutex_lock(&video->streaming->mutex); |
| 203 | |
| 204 | /* Perform probing. The device should adjust the requested values |
| 205 | * according to its capabilities. However, some devices, namely the |
| 206 | * first generation UVC Logitech webcams, don't implement the Video |
| 207 | * Probe control properly, and just return the needed bandwidth. For |
| 208 | * that reason, if the needed bandwidth exceeds the maximum available |
| 209 | * bandwidth, try to lower the quality. |
| 210 | */ |
| 211 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0) |
| 212 | goto done; |
| 213 | |
| 214 | /* Get the minimum and maximum values for compression settings. */ |
| 215 | if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) { |
| 216 | ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN); |
| 217 | if (ret < 0) |
| 218 | goto done; |
| 219 | ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX); |
| 220 | if (ret < 0) |
| 221 | goto done; |
| 222 | |
| 223 | probe->wCompQuality = probe_max.wCompQuality; |
| 224 | } |
| 225 | |
| 226 | for (i = 0; i < 2; ++i) { |
| 227 | if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 || |
| 228 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) |
| 229 | goto done; |
| 230 | |
| 231 | if (video->streaming->intf->num_altsetting == 1) |
| 232 | break; |
| 233 | |
| 234 | bandwidth = probe->dwMaxPayloadTransferSize; |
| 235 | if (bandwidth <= video->streaming->maxpsize) |
| 236 | break; |
| 237 | |
| 238 | if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) { |
| 239 | ret = -ENOSPC; |
| 240 | goto done; |
| 241 | } |
| 242 | |
| 243 | /* TODO: negotiate compression parameters */ |
| 244 | probe->wKeyFrameRate = probe_min.wKeyFrameRate; |
| 245 | probe->wPFrameRate = probe_min.wPFrameRate; |
| 246 | probe->wCompQuality = probe_max.wCompQuality; |
| 247 | probe->wCompWindowSize = probe_min.wCompWindowSize; |
| 248 | } |
| 249 | |
| 250 | done: |
| 251 | mutex_unlock(&video->streaming->mutex); |
| 252 | return ret; |
| 253 | } |
| 254 | |
| 255 | /* ------------------------------------------------------------------------ |
| 256 | * Video codecs |
| 257 | */ |
| 258 | |
| 259 | /* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */ |
| 260 | #define UVC_STREAM_EOH (1 << 7) |
| 261 | #define UVC_STREAM_ERR (1 << 6) |
| 262 | #define UVC_STREAM_STI (1 << 5) |
| 263 | #define UVC_STREAM_RES (1 << 4) |
| 264 | #define UVC_STREAM_SCR (1 << 3) |
| 265 | #define UVC_STREAM_PTS (1 << 2) |
| 266 | #define UVC_STREAM_EOF (1 << 1) |
| 267 | #define UVC_STREAM_FID (1 << 0) |
| 268 | |
| 269 | /* Video payload decoding is handled by uvc_video_decode_start(), |
| 270 | * uvc_video_decode_data() and uvc_video_decode_end(). |
| 271 | * |
| 272 | * uvc_video_decode_start is called with URB data at the start of a bulk or |
| 273 | * isochronous payload. It processes header data and returns the header size |
| 274 | * in bytes if successful. If an error occurs, it returns a negative error |
| 275 | * code. The following error codes have special meanings. |
| 276 | * |
| 277 | * - EAGAIN informs the caller that the current video buffer should be marked |
| 278 | * as done, and that the function should be called again with the same data |
| 279 | * and a new video buffer. This is used when end of frame conditions can be |
| 280 | * reliably detected at the beginning of the next frame only. |
| 281 | * |
| 282 | * If an error other than -EAGAIN is returned, the caller will drop the current |
| 283 | * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be |
| 284 | * made until the next payload. -ENODATA can be used to drop the current |
| 285 | * payload if no other error code is appropriate. |
| 286 | * |
| 287 | * uvc_video_decode_data is called for every URB with URB data. It copies the |
| 288 | * data to the video buffer. |
| 289 | * |
| 290 | * uvc_video_decode_end is called with header data at the end of a bulk or |
| 291 | * isochronous payload. It performs any additional header data processing and |
| 292 | * returns 0 or a negative error code if an error occured. As header data have |
| 293 | * already been processed by uvc_video_decode_start, this functions isn't |
| 294 | * required to perform sanity checks a second time. |
| 295 | * |
| 296 | * For isochronous transfers where a payload is always transfered in a single |
| 297 | * URB, the three functions will be called in a row. |
| 298 | * |
| 299 | * To let the decoder process header data and update its internal state even |
| 300 | * when no video buffer is available, uvc_video_decode_start must be prepared |
| 301 | * to be called with a NULL buf parameter. uvc_video_decode_data and |
| 302 | * uvc_video_decode_end will never be called with a NULL buffer. |
| 303 | */ |
| 304 | static int uvc_video_decode_start(struct uvc_video_device *video, |
| 305 | struct uvc_buffer *buf, const __u8 *data, int len) |
| 306 | { |
| 307 | __u8 fid; |
| 308 | |
| 309 | /* Sanity checks: |
| 310 | * - packet must be at least 2 bytes long |
| 311 | * - bHeaderLength value must be at least 2 bytes (see above) |
| 312 | * - bHeaderLength value can't be larger than the packet size. |
| 313 | */ |
| 314 | if (len < 2 || data[0] < 2 || data[0] > len) |
| 315 | return -EINVAL; |
| 316 | |
| 317 | /* Skip payloads marked with the error bit ("error frames"). */ |
| 318 | if (data[1] & UVC_STREAM_ERR) { |
| 319 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit " |
| 320 | "set).\n"); |
| 321 | return -ENODATA; |
| 322 | } |
| 323 | |
| 324 | fid = data[1] & UVC_STREAM_FID; |
| 325 | |
| 326 | /* Store the payload FID bit and return immediately when the buffer is |
| 327 | * NULL. |
| 328 | */ |
| 329 | if (buf == NULL) { |
| 330 | video->last_fid = fid; |
| 331 | return -ENODATA; |
| 332 | } |
| 333 | |
| 334 | /* Synchronize to the input stream by waiting for the FID bit to be |
| 335 | * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE. |
| 336 | * queue->last_fid is initialized to -1, so the first isochronous |
| 337 | * frame will always be in sync. |
| 338 | * |
| 339 | * If the device doesn't toggle the FID bit, invert video->last_fid |
| 340 | * when the EOF bit is set to force synchronisation on the next packet. |
| 341 | */ |
| 342 | if (buf->state != UVC_BUF_STATE_ACTIVE) { |
| 343 | if (fid == video->last_fid) { |
| 344 | uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of " |
| 345 | "sync).\n"); |
| 346 | if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) && |
| 347 | (data[1] & UVC_STREAM_EOF)) |
| 348 | video->last_fid ^= UVC_STREAM_FID; |
| 349 | return -ENODATA; |
| 350 | } |
| 351 | |
| 352 | /* TODO: Handle PTS and SCR. */ |
| 353 | buf->state = UVC_BUF_STATE_ACTIVE; |
| 354 | } |
| 355 | |
| 356 | /* Mark the buffer as done if we're at the beginning of a new frame. |
| 357 | * End of frame detection is better implemented by checking the EOF |
| 358 | * bit (FID bit toggling is delayed by one frame compared to the EOF |
| 359 | * bit), but some devices don't set the bit at end of frame (and the |
| 360 | * last payload can be lost anyway). We thus must check if the FID has |
| 361 | * been toggled. |
| 362 | * |
| 363 | * queue->last_fid is initialized to -1, so the first isochronous |
| 364 | * frame will never trigger an end of frame detection. |
| 365 | * |
| 366 | * Empty buffers (bytesused == 0) don't trigger end of frame detection |
| 367 | * as it doesn't make sense to return an empty buffer. This also |
| 368 | * avoids detecting and of frame conditions at FID toggling if the |
| 369 | * previous payload had the EOF bit set. |
| 370 | */ |
| 371 | if (fid != video->last_fid && buf->buf.bytesused != 0) { |
| 372 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " |
| 373 | "toggled).\n"); |
| 374 | buf->state = UVC_BUF_STATE_DONE; |
| 375 | return -EAGAIN; |
| 376 | } |
| 377 | |
| 378 | video->last_fid = fid; |
| 379 | |
| 380 | return data[0]; |
| 381 | } |
| 382 | |
| 383 | static void uvc_video_decode_data(struct uvc_video_device *video, |
| 384 | struct uvc_buffer *buf, const __u8 *data, int len) |
| 385 | { |
| 386 | struct uvc_video_queue *queue = &video->queue; |
| 387 | unsigned int maxlen, nbytes; |
| 388 | void *mem; |
| 389 | |
| 390 | if (len <= 0) |
| 391 | return; |
| 392 | |
| 393 | /* Copy the video data to the buffer. */ |
| 394 | maxlen = buf->buf.length - buf->buf.bytesused; |
| 395 | mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; |
| 396 | nbytes = min((unsigned int)len, maxlen); |
| 397 | memcpy(mem, data, nbytes); |
| 398 | buf->buf.bytesused += nbytes; |
| 399 | |
| 400 | /* Complete the current frame if the buffer size was exceeded. */ |
| 401 | if (len > maxlen) { |
| 402 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n"); |
| 403 | buf->state = UVC_BUF_STATE_DONE; |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | static void uvc_video_decode_end(struct uvc_video_device *video, |
| 408 | struct uvc_buffer *buf, const __u8 *data, int len) |
| 409 | { |
| 410 | /* Mark the buffer as done if the EOF marker is set. */ |
| 411 | if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { |
| 412 | uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n"); |
| 413 | if (data[0] == len) |
| 414 | uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n"); |
| 415 | buf->state = UVC_BUF_STATE_DONE; |
| 416 | if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) |
| 417 | video->last_fid ^= UVC_STREAM_FID; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | /* ------------------------------------------------------------------------ |
| 422 | * URB handling |
| 423 | */ |
| 424 | |
| 425 | /* |
| 426 | * Completion handler for video URBs. |
| 427 | */ |
| 428 | static void uvc_video_decode_isoc(struct urb *urb, |
| 429 | struct uvc_video_device *video, struct uvc_buffer *buf) |
| 430 | { |
| 431 | u8 *mem; |
| 432 | int ret, i; |
| 433 | |
| 434 | for (i = 0; i < urb->number_of_packets; ++i) { |
| 435 | if (urb->iso_frame_desc[i].status < 0) { |
| 436 | uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " |
| 437 | "lost (%d).\n", urb->iso_frame_desc[i].status); |
| 438 | continue; |
| 439 | } |
| 440 | |
| 441 | /* Decode the payload header. */ |
| 442 | mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset; |
| 443 | do { |
| 444 | ret = uvc_video_decode_start(video, buf, mem, |
| 445 | urb->iso_frame_desc[i].actual_length); |
| 446 | if (ret == -EAGAIN) |
| 447 | buf = uvc_queue_next_buffer(&video->queue, buf); |
| 448 | } while (ret == -EAGAIN); |
| 449 | |
| 450 | if (ret < 0) |
| 451 | continue; |
| 452 | |
| 453 | /* Decode the payload data. */ |
| 454 | uvc_video_decode_data(video, buf, mem + ret, |
| 455 | urb->iso_frame_desc[i].actual_length - ret); |
| 456 | |
| 457 | /* Process the header again. */ |
| 458 | uvc_video_decode_end(video, buf, mem, ret); |
| 459 | |
| 460 | if (buf->state == UVC_BUF_STATE_DONE || |
| 461 | buf->state == UVC_BUF_STATE_ERROR) |
| 462 | buf = uvc_queue_next_buffer(&video->queue, buf); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | static void uvc_video_decode_bulk(struct urb *urb, |
| 467 | struct uvc_video_device *video, struct uvc_buffer *buf) |
| 468 | { |
| 469 | u8 *mem; |
| 470 | int len, ret; |
| 471 | |
| 472 | mem = urb->transfer_buffer; |
| 473 | len = urb->actual_length; |
| 474 | video->bulk.payload_size += len; |
| 475 | |
| 476 | /* If the URB is the first of its payload, decode and save the |
| 477 | * header. |
| 478 | */ |
| 479 | if (video->bulk.header_size == 0) { |
| 480 | do { |
| 481 | ret = uvc_video_decode_start(video, buf, mem, len); |
| 482 | if (ret == -EAGAIN) |
| 483 | buf = uvc_queue_next_buffer(&video->queue, buf); |
| 484 | } while (ret == -EAGAIN); |
| 485 | |
| 486 | /* If an error occured skip the rest of the payload. */ |
| 487 | if (ret < 0 || buf == NULL) { |
| 488 | video->bulk.skip_payload = 1; |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | video->bulk.header_size = ret; |
| 493 | memcpy(video->bulk.header, mem, video->bulk.header_size); |
| 494 | |
| 495 | mem += ret; |
| 496 | len -= ret; |
| 497 | } |
| 498 | |
| 499 | /* The buffer queue might have been cancelled while a bulk transfer |
| 500 | * was in progress, so we can reach here with buf equal to NULL. Make |
| 501 | * sure buf is never dereferenced if NULL. |
| 502 | */ |
| 503 | |
| 504 | /* Process video data. */ |
| 505 | if (!video->bulk.skip_payload && buf != NULL) |
| 506 | uvc_video_decode_data(video, buf, mem, len); |
| 507 | |
| 508 | /* Detect the payload end by a URB smaller than the maximum size (or |
| 509 | * a payload size equal to the maximum) and process the header again. |
| 510 | */ |
| 511 | if (urb->actual_length < urb->transfer_buffer_length || |
| 512 | video->bulk.payload_size >= video->bulk.max_payload_size) { |
| 513 | if (!video->bulk.skip_payload && buf != NULL) { |
| 514 | uvc_video_decode_end(video, buf, video->bulk.header, |
| 515 | video->bulk.header_size); |
| 516 | if (buf->state == UVC_BUF_STATE_DONE || |
| 517 | buf->state == UVC_BUF_STATE_ERROR) |
| 518 | buf = uvc_queue_next_buffer(&video->queue, buf); |
| 519 | } |
| 520 | |
| 521 | video->bulk.header_size = 0; |
| 522 | video->bulk.skip_payload = 0; |
| 523 | video->bulk.payload_size = 0; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | static void uvc_video_complete(struct urb *urb) |
| 528 | { |
| 529 | struct uvc_video_device *video = urb->context; |
| 530 | struct uvc_video_queue *queue = &video->queue; |
| 531 | struct uvc_buffer *buf = NULL; |
| 532 | unsigned long flags; |
| 533 | int ret; |
| 534 | |
| 535 | switch (urb->status) { |
| 536 | case 0: |
| 537 | break; |
| 538 | |
| 539 | default: |
| 540 | uvc_printk(KERN_WARNING, "Non-zero status (%d) in video " |
| 541 | "completion handler.\n", urb->status); |
| 542 | |
| 543 | case -ENOENT: /* usb_kill_urb() called. */ |
| 544 | if (video->frozen) |
| 545 | return; |
| 546 | |
| 547 | case -ECONNRESET: /* usb_unlink_urb() called. */ |
| 548 | case -ESHUTDOWN: /* The endpoint is being disabled. */ |
| 549 | uvc_queue_cancel(queue, urb->status == -ESHUTDOWN); |
| 550 | return; |
| 551 | } |
| 552 | |
| 553 | spin_lock_irqsave(&queue->irqlock, flags); |
| 554 | if (!list_empty(&queue->irqqueue)) |
| 555 | buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, |
| 556 | queue); |
| 557 | spin_unlock_irqrestore(&queue->irqlock, flags); |
| 558 | |
| 559 | video->decode(urb, video, buf); |
| 560 | |
| 561 | if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { |
| 562 | uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", |
| 563 | ret); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | /* |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 568 | * Free transfer buffers. |
| 569 | */ |
| 570 | static void uvc_free_urb_buffers(struct uvc_video_device *video) |
| 571 | { |
| 572 | unsigned int i; |
| 573 | |
| 574 | for (i = 0; i < UVC_URBS; ++i) { |
| 575 | if (video->urb_buffer[i]) { |
| 576 | usb_buffer_free(video->dev->udev, video->urb_size, |
| 577 | video->urb_buffer[i], video->urb_dma[i]); |
| 578 | video->urb_buffer[i] = NULL; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | video->urb_size = 0; |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * Allocate transfer buffers. This function can be called with buffers |
| 587 | * already allocated when resuming from suspend, in which case it will |
| 588 | * return without touching the buffers. |
| 589 | * |
| 590 | * Return 0 on success or -ENOMEM when out of memory. |
| 591 | */ |
| 592 | static int uvc_alloc_urb_buffers(struct uvc_video_device *video, |
| 593 | unsigned int size) |
| 594 | { |
| 595 | unsigned int i; |
| 596 | |
| 597 | /* Buffers are already allocated, bail out. */ |
| 598 | if (video->urb_size) |
| 599 | return 0; |
| 600 | |
| 601 | for (i = 0; i < UVC_URBS; ++i) { |
| 602 | video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev, |
| 603 | size, GFP_KERNEL, &video->urb_dma[i]); |
| 604 | if (video->urb_buffer[i] == NULL) { |
| 605 | uvc_free_urb_buffers(video); |
| 606 | return -ENOMEM; |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | video->urb_size = size; |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | /* |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 615 | * Uninitialize isochronous/bulk URBs and free transfer buffers. |
| 616 | */ |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 617 | static void uvc_uninit_video(struct uvc_video_device *video, int free_buffers) |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 618 | { |
| 619 | struct urb *urb; |
| 620 | unsigned int i; |
| 621 | |
| 622 | for (i = 0; i < UVC_URBS; ++i) { |
| 623 | if ((urb = video->urb[i]) == NULL) |
| 624 | continue; |
| 625 | |
| 626 | usb_kill_urb(urb); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 627 | usb_free_urb(urb); |
| 628 | video->urb[i] = NULL; |
| 629 | } |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 630 | |
| 631 | if (free_buffers) |
| 632 | uvc_free_urb_buffers(video); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Initialize isochronous URBs and allocate transfer buffers. The packet size |
| 637 | * is given by the endpoint. |
| 638 | */ |
| 639 | static int uvc_init_video_isoc(struct uvc_video_device *video, |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 640 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 641 | { |
| 642 | struct urb *urb; |
| 643 | unsigned int npackets, i, j; |
| 644 | __u16 psize; |
| 645 | __u32 size; |
| 646 | |
| 647 | /* Compute the number of isochronous packets to allocate by dividing |
| 648 | * the maximum video frame size by the packet size. Limit the result |
| 649 | * to UVC_MAX_ISO_PACKETS. |
| 650 | */ |
| 651 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
| 652 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); |
| 653 | |
| 654 | size = video->streaming->ctrl.dwMaxVideoFrameSize; |
| 655 | if (size > UVC_MAX_FRAME_SIZE) |
| 656 | return -EINVAL; |
| 657 | |
| 658 | npackets = (size + psize - 1) / psize; |
| 659 | if (npackets > UVC_MAX_ISO_PACKETS) |
| 660 | npackets = UVC_MAX_ISO_PACKETS; |
| 661 | |
| 662 | size = npackets * psize; |
| 663 | |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 664 | if (uvc_alloc_urb_buffers(video, size) < 0) |
| 665 | return -ENOMEM; |
| 666 | |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 667 | for (i = 0; i < UVC_URBS; ++i) { |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 668 | urb = usb_alloc_urb(npackets, gfp_flags); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 669 | if (urb == NULL) { |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 670 | uvc_uninit_video(video, 1); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 671 | return -ENOMEM; |
| 672 | } |
| 673 | |
| 674 | urb->dev = video->dev->udev; |
| 675 | urb->context = video; |
| 676 | urb->pipe = usb_rcvisocpipe(video->dev->udev, |
| 677 | ep->desc.bEndpointAddress); |
| 678 | urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
| 679 | urb->interval = ep->desc.bInterval; |
| 680 | urb->transfer_buffer = video->urb_buffer[i]; |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 681 | urb->transfer_dma = video->urb_dma[i]; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 682 | urb->complete = uvc_video_complete; |
| 683 | urb->number_of_packets = npackets; |
| 684 | urb->transfer_buffer_length = size; |
| 685 | |
| 686 | for (j = 0; j < npackets; ++j) { |
| 687 | urb->iso_frame_desc[j].offset = j * psize; |
| 688 | urb->iso_frame_desc[j].length = psize; |
| 689 | } |
| 690 | |
| 691 | video->urb[i] = urb; |
| 692 | } |
| 693 | |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | /* |
| 698 | * Initialize bulk URBs and allocate transfer buffers. The packet size is |
| 699 | * given by the endpoint. |
| 700 | */ |
| 701 | static int uvc_init_video_bulk(struct uvc_video_device *video, |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 702 | struct usb_host_endpoint *ep, gfp_t gfp_flags) |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 703 | { |
| 704 | struct urb *urb; |
| 705 | unsigned int pipe, i; |
| 706 | __u16 psize; |
| 707 | __u32 size; |
| 708 | |
| 709 | /* Compute the bulk URB size. Some devices set the maximum payload |
| 710 | * size to a value too high for memory-constrained devices. We must |
| 711 | * then transfer the payload accross multiple URBs. To be consistant |
| 712 | * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk |
| 713 | * URB. |
| 714 | */ |
| 715 | psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff; |
| 716 | size = video->streaming->ctrl.dwMaxPayloadTransferSize; |
| 717 | video->bulk.max_payload_size = size; |
| 718 | if (size > psize * UVC_MAX_ISO_PACKETS) |
| 719 | size = psize * UVC_MAX_ISO_PACKETS; |
| 720 | |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 721 | if (uvc_alloc_urb_buffers(video, size) < 0) |
| 722 | return -ENOMEM; |
| 723 | |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 724 | pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress); |
| 725 | |
| 726 | for (i = 0; i < UVC_URBS; ++i) { |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 727 | urb = usb_alloc_urb(0, gfp_flags); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 728 | if (urb == NULL) { |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 729 | uvc_uninit_video(video, 1); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 730 | return -ENOMEM; |
| 731 | } |
| 732 | |
| 733 | usb_fill_bulk_urb(urb, video->dev->udev, pipe, |
| 734 | video->urb_buffer[i], size, uvc_video_complete, |
| 735 | video); |
| 736 | urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 737 | urb->transfer_dma = video->urb_dma[i]; |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 738 | |
| 739 | video->urb[i] = urb; |
| 740 | } |
| 741 | |
| 742 | return 0; |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * Initialize isochronous/bulk URBs and allocate transfer buffers. |
| 747 | */ |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 748 | static int uvc_init_video(struct uvc_video_device *video, gfp_t gfp_flags) |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 749 | { |
| 750 | struct usb_interface *intf = video->streaming->intf; |
| 751 | struct usb_host_interface *alts; |
| 752 | struct usb_host_endpoint *ep = NULL; |
| 753 | int intfnum = video->streaming->intfnum; |
| 754 | unsigned int bandwidth, psize, i; |
| 755 | int ret; |
| 756 | |
| 757 | video->last_fid = -1; |
| 758 | video->bulk.header_size = 0; |
| 759 | video->bulk.skip_payload = 0; |
| 760 | video->bulk.payload_size = 0; |
| 761 | |
| 762 | if (intf->num_altsetting > 1) { |
| 763 | /* Isochronous endpoint, select the alternate setting. */ |
| 764 | bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize; |
| 765 | |
| 766 | if (bandwidth == 0) { |
| 767 | uvc_printk(KERN_WARNING, "device %s requested null " |
| 768 | "bandwidth, defaulting to lowest.\n", |
| 769 | video->vdev->name); |
| 770 | bandwidth = 1; |
| 771 | } |
| 772 | |
| 773 | for (i = 0; i < intf->num_altsetting; ++i) { |
| 774 | alts = &intf->altsetting[i]; |
| 775 | ep = uvc_find_endpoint(alts, |
| 776 | video->streaming->header.bEndpointAddress); |
| 777 | if (ep == NULL) |
| 778 | continue; |
| 779 | |
| 780 | /* Check if the bandwidth is high enough. */ |
| 781 | psize = le16_to_cpu(ep->desc.wMaxPacketSize); |
| 782 | psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); |
| 783 | if (psize >= bandwidth) |
| 784 | break; |
| 785 | } |
| 786 | |
| 787 | if (i >= intf->num_altsetting) |
| 788 | return -EIO; |
| 789 | |
| 790 | if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0) |
| 791 | return ret; |
| 792 | |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 793 | ret = uvc_init_video_isoc(video, ep, gfp_flags); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 794 | } else { |
| 795 | /* Bulk endpoint, proceed to URB initialization. */ |
| 796 | ep = uvc_find_endpoint(&intf->altsetting[0], |
| 797 | video->streaming->header.bEndpointAddress); |
| 798 | if (ep == NULL) |
| 799 | return -EIO; |
| 800 | |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 801 | ret = uvc_init_video_bulk(video, ep, gfp_flags); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | if (ret < 0) |
| 805 | return ret; |
| 806 | |
| 807 | /* Submit the URBs. */ |
| 808 | for (i = 0; i < UVC_URBS; ++i) { |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 809 | if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) { |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 810 | uvc_printk(KERN_ERR, "Failed to submit URB %u " |
| 811 | "(%d).\n", i, ret); |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 812 | uvc_uninit_video(video, 1); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 813 | return ret; |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | return 0; |
| 818 | } |
| 819 | |
| 820 | /* -------------------------------------------------------------------------- |
| 821 | * Suspend/resume |
| 822 | */ |
| 823 | |
| 824 | /* |
| 825 | * Stop streaming without disabling the video queue. |
| 826 | * |
| 827 | * To let userspace applications resume without trouble, we must not touch the |
| 828 | * video buffers in any way. We mark the device as frozen to make sure the URB |
| 829 | * completion handler won't try to cancel the queue when we kill the URBs. |
| 830 | */ |
| 831 | int uvc_video_suspend(struct uvc_video_device *video) |
| 832 | { |
| 833 | if (!uvc_queue_streaming(&video->queue)) |
| 834 | return 0; |
| 835 | |
| 836 | video->frozen = 1; |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 837 | uvc_uninit_video(video, 0); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 838 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Reconfigure the video interface and restart streaming if it was enable |
| 844 | * before suspend. |
| 845 | * |
| 846 | * If an error occurs, disable the video queue. This will wake all pending |
| 847 | * buffers, making sure userspace applications are notified of the problem |
| 848 | * instead of waiting forever. |
| 849 | */ |
| 850 | int uvc_video_resume(struct uvc_video_device *video) |
| 851 | { |
| 852 | int ret; |
| 853 | |
| 854 | video->frozen = 0; |
| 855 | |
| 856 | if ((ret = uvc_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 0) { |
| 857 | uvc_queue_enable(&video->queue, 0); |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | if (!uvc_queue_streaming(&video->queue)) |
| 862 | return 0; |
| 863 | |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 864 | if ((ret = uvc_init_video(video, GFP_NOIO)) < 0) |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 865 | uvc_queue_enable(&video->queue, 0); |
| 866 | |
| 867 | return ret; |
| 868 | } |
| 869 | |
| 870 | /* ------------------------------------------------------------------------ |
| 871 | * Video device |
| 872 | */ |
| 873 | |
| 874 | /* |
| 875 | * Initialize the UVC video device by retrieving the default format and |
| 876 | * committing it. |
| 877 | * |
| 878 | * Some cameras (namely the Fuji Finepix) set the format and frame |
| 879 | * indexes to zero. The UVC standard doesn't clearly make this a spec |
| 880 | * violation, so try to silently fix the values if possible. |
| 881 | * |
| 882 | * This function is called before registering the device with V4L. |
| 883 | */ |
| 884 | int uvc_video_init(struct uvc_video_device *video) |
| 885 | { |
| 886 | struct uvc_streaming_control *probe = &video->streaming->ctrl; |
| 887 | struct uvc_format *format = NULL; |
| 888 | struct uvc_frame *frame = NULL; |
| 889 | unsigned int i; |
| 890 | int ret; |
| 891 | |
| 892 | if (video->streaming->nformats == 0) { |
| 893 | uvc_printk(KERN_INFO, "No supported video formats found.\n"); |
| 894 | return -EINVAL; |
| 895 | } |
| 896 | |
| 897 | /* Alternate setting 0 should be the default, yet the XBox Live Vision |
| 898 | * Cam (and possibly other devices) crash or otherwise misbehave if |
| 899 | * they don't receive a SET_INTERFACE request before any other video |
| 900 | * control request. |
| 901 | */ |
| 902 | usb_set_interface(video->dev->udev, video->streaming->intfnum, 0); |
| 903 | |
| 904 | /* Some webcams don't suport GET_DEF request on the probe control. We |
| 905 | * fall back to GET_CUR if GET_DEF fails. |
| 906 | */ |
| 907 | if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 && |
| 908 | (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) |
| 909 | return ret; |
| 910 | |
| 911 | /* Check if the default format descriptor exists. Use the first |
| 912 | * available format otherwise. |
| 913 | */ |
| 914 | for (i = video->streaming->nformats; i > 0; --i) { |
| 915 | format = &video->streaming->format[i-1]; |
| 916 | if (format->index == probe->bFormatIndex) |
| 917 | break; |
| 918 | } |
| 919 | |
| 920 | if (format->nframes == 0) { |
| 921 | uvc_printk(KERN_INFO, "No frame descriptor found for the " |
| 922 | "default format.\n"); |
| 923 | return -EINVAL; |
| 924 | } |
| 925 | |
| 926 | /* Zero bFrameIndex might be correct. Stream-based formats (including |
| 927 | * MPEG-2 TS and DV) do not support frames but have a dummy frame |
| 928 | * descriptor with bFrameIndex set to zero. If the default frame |
| 929 | * descriptor is not found, use the first avalable frame. |
| 930 | */ |
| 931 | for (i = format->nframes; i > 0; --i) { |
| 932 | frame = &format->frame[i-1]; |
| 933 | if (frame->bFrameIndex == probe->bFrameIndex) |
| 934 | break; |
| 935 | } |
| 936 | |
| 937 | /* Commit the default settings. */ |
| 938 | probe->bFormatIndex = format->index; |
| 939 | probe->bFrameIndex = frame->bFrameIndex; |
| 940 | if ((ret = uvc_set_video_ctrl(video, probe, 0)) < 0) |
| 941 | return ret; |
| 942 | |
| 943 | video->streaming->cur_format = format; |
| 944 | video->streaming->cur_frame = frame; |
| 945 | atomic_set(&video->active, 0); |
| 946 | |
| 947 | /* Select the video decoding function */ |
| 948 | if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT) |
| 949 | video->decode = uvc_video_decode_isight; |
| 950 | else if (video->streaming->intf->num_altsetting > 1) |
| 951 | video->decode = uvc_video_decode_isoc; |
| 952 | else |
| 953 | video->decode = uvc_video_decode_bulk; |
| 954 | |
| 955 | return 0; |
| 956 | } |
| 957 | |
| 958 | /* |
| 959 | * Enable or disable the video stream. |
| 960 | */ |
| 961 | int uvc_video_enable(struct uvc_video_device *video, int enable) |
| 962 | { |
| 963 | int ret; |
| 964 | |
| 965 | if (!enable) { |
Laurent Pinchart | e01117c | 2008-07-04 00:36:21 -0300 | [diff] [blame] | 966 | uvc_uninit_video(video, 1); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 967 | usb_set_interface(video->dev->udev, |
| 968 | video->streaming->intfnum, 0); |
| 969 | uvc_queue_enable(&video->queue, 0); |
| 970 | return 0; |
| 971 | } |
| 972 | |
| 973 | if ((ret = uvc_queue_enable(&video->queue, 1)) < 0) |
| 974 | return ret; |
| 975 | |
Laurent Pinchart | 2913587 | 2008-07-04 00:35:26 -0300 | [diff] [blame] | 976 | return uvc_init_video(video, GFP_KERNEL); |
Laurent Pinchart | c0efd23 | 2008-06-30 15:04:50 -0300 | [diff] [blame] | 977 | } |
Hans Verkuil | f87086e | 2008-07-18 00:50:58 -0300 | [diff] [blame] | 978 | |