cpia.c

cpia usb摄像头的驱动程序源码。需要video4linux和i2c-core支持

			command_flags |= COMMAND_SETCOMPRESSIONTARGET;
		} else if (MATCH("y_threshold")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val < 32)
					new_params.yuvThreshold.yThreshold = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETYUVTHRESH;
		} else if (MATCH("uv_threshold")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val < 32)
					new_params.yuvThreshold.uvThreshold = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETYUVTHRESH;
		} else if (MATCH("hysteresis")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.hysteresis = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("threshold_max")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.threshMax = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("small_step")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.smallStep = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("large_step")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.largeStep = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("decimation_hysteresis")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.decimationHysteresis = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("fr_diff_step_thresh")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.frDiffStepThresh = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("q_diff_step_thresh")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.qDiffStepThresh = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("decimation_thresh_mod")) {
			if (!retval)
				val = VALUE;

			if (!retval) {
				if (val <= 0xff)
					new_params.compressionParams.decimationThreshMod = val;
				else
					retval = -EINVAL;
			}
			command_flags |= COMMAND_SETCOMPRESSIONPARAMS;
		} else if (MATCH("toplight")) {
		        if (!retval && MATCH("on"))
				new_params.qx3.toplight = 1;
			else if (!retval && MATCH("off"))
				new_params.qx3.toplight = 0;
			else 
				retval = -EINVAL;
			command_flags |= COMMAND_SETLIGHTS;
		} else if (MATCH("bottomlight")) {
		        if (!retval && MATCH("on"))
				new_params.qx3.bottomlight = 1;
			else if (!retval && MATCH("off"))  
				new_params.qx3.bottomlight = 0;
			else 
				retval = -EINVAL;
			command_flags |= COMMAND_SETLIGHTS;
		} else {
			DBG("No match found\n");
			retval = -EINVAL;
		}

		if (!retval) {
			while (count && isspace(*buffer) && *buffer != '\n') {
				--count;
				++buffer;
			}
			if (count) {
				if (*buffer == '\0' && count != 1)
					retval = -EINVAL;
				else if (*buffer != '\n' && *buffer != ';' &&
					 *buffer != '\0')
					retval = -EINVAL;
				else {
					--count;
					++buffer;
				}
			}
		}
	}
#undef MATCH	
#undef VALUE
#undef FIRMWARE_VERSION

	if (!retval) {
		if (command_flags & COMMAND_SETCOLOURPARAMS) {
			/* Adjust cam->vp to reflect these changes */
			cam->vp.brightness =
				new_params.colourParams.brightness*65535/100;
			cam->vp.contrast =
				new_params.colourParams.contrast*65535/100;
			cam->vp.colour =
				new_params.colourParams.saturation*65535/100;
		}
		if((command_flags & COMMAND_SETEXPOSURE) &&
		   new_params.exposure.expMode == 2)
			cam->exposure_status = EXPOSURE_NORMAL;

		memcpy(&cam->params, &new_params, sizeof(struct cam_params));
		cam->mainsFreq = new_mains;
		cam->cmd_queue |= command_flags;
		retval = size;
	} else
		DBG("error: %d\n", retval);
	
	up(&cam->param_lock);
	
out:
	free_page((unsigned long)page);
	return retval;
}

static void create_proc_cpia_cam(struct cam_data *cam)
{
	char name[7];
	struct proc_dir_entry *ent;
	
	if (!cpia_proc_root || !cam)
		return;

	sprintf(name, "video%d", cam->vdev.minor);
	
	ent = create_proc_entry(name, S_IFREG|S_IRUGO|S_IWUSR, cpia_proc_root);
	if (!ent)
		return;

	ent->data = cam;
	ent->read_proc = cpia_read_proc;
	ent->write_proc = cpia_write_proc;
	/* 
	   size of the proc entry is 3736 bytes for the standard webcam;
 	   the extra features of the QX3 microscope add 189 bytes.
	   (we have not yet probed the camera to see which type it is).
	*/
	ent->size = 3736 + 189;
	cam->proc_entry = ent;
}

static void destroy_proc_cpia_cam(struct cam_data *cam)
{
	char name[7];
	
	if (!cam || !cam->proc_entry)
		return;
	
	sprintf(name, "video%d", cam->vdev.minor);
	remove_proc_entry(name, cpia_proc_root);
	cam->proc_entry = NULL;
}

static void proc_cpia_create(void)
{
	cpia_proc_root = create_proc_entry("cpia", S_IFDIR, 0);

	if (cpia_proc_root)
		cpia_proc_root->owner = THIS_MODULE;
	else
		LOG("Unable to initialise /proc/cpia\n");
}

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,70))
static void proc_cpia_destroy(void)
#else
static void __exit proc_cpia_destroy(void)
#endif
{
	remove_proc_entry("cpia", 0);
}
#endif /* CONFIG_PROC_FS */

/* ----------------------- debug functions ---------------------- */

#define printstatus(cam) \
  DBG("%02x %02x %02x %02x %02x %02x %02x %02x\n",\
	cam->params.status.systemState, cam->params.status.grabState, \
	cam->params.status.streamState, cam->params.status.fatalError, \
	cam->params.status.cmdError, cam->params.status.debugFlags, \
	cam->params.status.vpStatus, cam->params.status.errorCode);

/* ----------------------- v4l helpers -------------------------- */

/* supported frame palettes and depths */
static inline int valid_mode(u16 palette, u16 depth)
{
	return (palette == VIDEO_PALETTE_GREY && depth == 8) ||
	       (palette == VIDEO_PALETTE_RGB555 && depth == 16) ||
	       (palette == VIDEO_PALETTE_RGB565 && depth == 16) ||
	       (palette == VIDEO_PALETTE_RGB24 && depth == 24) ||
	       (palette == VIDEO_PALETTE_RGB32 && depth == 32) ||
	       (palette == VIDEO_PALETTE_YUV422 && depth == 16) ||
	       (palette == VIDEO_PALETTE_YUYV && depth == 16) ||
	       (palette == VIDEO_PALETTE_UYVY && depth == 16);
}

static int match_videosize( int width, int height )
{
	/* return the best match, where 'best' is as always
	 * the largest that is not bigger than what is requested. */
	if (width>=352 && height>=288)
		return VIDEOSIZE_352_288; /* CIF */

	if (width>=320 && height>=240)
		return VIDEOSIZE_320_240; /* SIF */

	if (width>=288 && height>=216)
		return VIDEOSIZE_288_216;

	if (width>=256 && height>=192)
		return VIDEOSIZE_256_192;

	if (width>=224 && height>=168)
		return VIDEOSIZE_224_168;

	if (width>=192 && height>=144)
		return VIDEOSIZE_192_144;

	if (width>=176 && height>=144)
		return VIDEOSIZE_176_144; /* QCIF */

	if (width>=160 && height>=120)
		return VIDEOSIZE_160_120; /* QSIF */

	if (width>=128 && height>=96)
		return VIDEOSIZE_128_96;

	if (width>=88 && height>=72)
		return VIDEOSIZE_88_72;

	if (width>=64 && height>=48)
		return VIDEOSIZE_64_48;

	if (width>=48 && height>=48)
		return VIDEOSIZE_48_48;

	return -1;
}

/* these are the capture sizes we support */
static void set_vw_size(struct cam_data *cam)
{
	/* the col/row/start/end values are the result of simple math    */
	/* study the SetROI-command in cpia developers guide p 2-22      */
	/* streamStartLine is set to the recommended value in the cpia   */
	/*  developers guide p 3-37                                      */
	switch(cam->video_size) {
	case VIDEOSIZE_CIF:
		cam->vw.width = 352;
		cam->vw.height = 288;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=0;
		cam->params.roi.rowStart=0;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_SIF:
		cam->vw.width = 320;
		cam->vw.height = 240;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=2;
		cam->params.roi.rowStart=6;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_288_216:
		cam->vw.width = 288;
		cam->vw.height = 216;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=4;
		cam->params.roi.rowStart=9;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_256_192:
		cam->vw.width = 256;
		cam->vw.height = 192;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=6;
		cam->params.roi.rowStart=12;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_224_168:
		cam->vw.width = 224;
		cam->vw.height = 168;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=8;
		cam->params.roi.rowStart=15;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_192_144:
		cam->vw.width = 192;
		cam->vw.height = 144;
		cam->params.format.videoSize=VIDEOSIZE_CIF;
		cam->params.roi.colStart=10;
		cam->params.roi.rowStart=18;
		cam->params.streamStartLine = 120;
		break;
	case VIDEOSIZE_QCIF:
		cam->vw.width = 176;
		cam->vw.height = 144;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=0;
		cam->params.roi.rowStart=0;
		cam->params.streamStartLine = 60;
		break;
	case VIDEOSIZE_QSIF:
		cam->vw.width = 160;
		cam->vw.height = 120;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=1;
		cam->params.roi.rowStart=3;
		cam->params.streamStartLine = 60;
		break;
	case VIDEOSIZE_128_96:
		cam->vw.width = 128;
		cam->vw.height = 96;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=3;
		cam->params.roi.rowStart=6;
		cam->params.streamStartLine = 60;
		break;
	case VIDEOSIZE_88_72:
		cam->vw.width = 88;
		cam->vw.height = 72;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=5;
		cam->params.roi.rowStart=9;
		cam->params.streamStartLine = 60;
		break;
	case VIDEOSIZE_64_48:
		cam->vw.width = 64;
		cam->vw.height = 48;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=7;
		cam->params.roi.rowStart=12;
		cam->params.streamStartLine = 60;
		break;
	case VIDEOSIZE_48_48:
		cam->vw.width = 48;
		cam->vw.height = 48;
		cam->params.format.videoSize=VIDEOSIZE_QCIF;
		cam->params.roi.colStart=8;
		cam->params.roi.rowStart=6;
		cam->params.streamStartLine = 60;
		break;
	default:
		LOG("bad videosize value: %d\n", cam->video_size);
		return;
	}

	if(cam->vc.width == 0)
		cam->vc.width = cam->vw.width;
	if(cam->vc.height == 0)
		cam->vc.height = cam->vw.height;
	
	cam->params.roi.colStart += cam->vc.x >> 3;
	cam->params.roi.colEnd = cam->params.roi.colStart +
	                         (cam->vc.width >> 3);
	cam->params.roi.rowStart += cam->vc.y >> 2;
	cam->params.roi.rowEnd = cam->params.roi.rowStart +
	                         (cam->vc.height >> 2);

	return;
}

static int allocate_frame_buf(struct cam_data *cam)
{
	int i;

	cam->frame_buf = rvmalloc(FRAME_NUM * CPIA_MAX_FRAME_SIZE);
	if (!cam->frame_buf)
		return -ENOBUFS;

	for (i = 0; i < FRAME_NUM; i++)
		cam->frame[i].data = cam->frame_buf + i * CPIA_MAX_FRAME_SIZE;

	return 0;
}