zr36060.c

linux-2.6.15.6

	zr36060_write(ptr, ZR060_SGR_HSYNC, reg);

	reg = norm->VStart - 1;	/* BVstart */
	zr36060_write(ptr, ZR060_SGR_BVSTART, reg);

	reg += norm->Ha / 2;	/* BVend */
	zr36060_write(ptr, ZR060_SGR_BVEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SGR_BVEND_LO, (reg >> 0) & 0xff);

	reg = norm->HStart - 1;	/* BHstart */
	zr36060_write(ptr, ZR060_SGR_BHSTART, reg);

	reg += norm->Wa;	/* BHend */
	zr36060_write(ptr, ZR060_SGR_BHEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SGR_BHEND_LO, (reg >> 0) & 0xff);

	/* active area */
	reg = cap->y + norm->VStart;	/* Vstart */
	zr36060_write(ptr, ZR060_AAR_VSTART_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_AAR_VSTART_LO, (reg >> 0) & 0xff);

	reg += cap->height;	/* Vend */
	zr36060_write(ptr, ZR060_AAR_VEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_AAR_VEND_LO, (reg >> 0) & 0xff);

	reg = cap->x + norm->HStart;	/* Hstart */
	zr36060_write(ptr, ZR060_AAR_HSTART_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_AAR_HSTART_LO, (reg >> 0) & 0xff);

	reg += cap->width;	/* Hend */
	zr36060_write(ptr, ZR060_AAR_HEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_AAR_HEND_LO, (reg >> 0) & 0xff);

	/* subimage area */
	reg = norm->VStart - 4;	/* SVstart */
	zr36060_write(ptr, ZR060_SWR_VSTART_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SWR_VSTART_LO, (reg >> 0) & 0xff);

	reg += norm->Ha / 2 + 8;	/* SVend */
	zr36060_write(ptr, ZR060_SWR_VEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SWR_VEND_LO, (reg >> 0) & 0xff);

	reg = norm->HStart /*+ 64 */  - 4;	/* SHstart */
	zr36060_write(ptr, ZR060_SWR_HSTART_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SWR_HSTART_LO, (reg >> 0) & 0xff);

	reg += norm->Wa + 8;	/* SHend */
	zr36060_write(ptr, ZR060_SWR_HEND_HI, (reg >> 8) & 0xff);
	zr36060_write(ptr, ZR060_SWR_HEND_LO, (reg >> 0) & 0xff);

	size = ptr->width * ptr->height;
	/* Target compressed field size in bits: */
	size = size * 16;	/* uncompressed size in bits */
	/* (Ronald) by default, quality = 100 is a compression
	 * ratio 1:2. Setting low_bitrate (insmod option) sets
	 * it to 1:4 (instead of 1:2, zr36060 max) as limit because the
	 * buz can't handle more at decimation=1... Use low_bitrate if
	 * you have a Buz, unless you know what you're doing */
	size = size * cap->quality / (low_bitrate ? 400 : 200);
	/* Lower limit (arbitrary, 1 KB) */
	if (size < 8192)
		size = 8192;
	/* Upper limit: 7/8 of the code buffers */
	if (size > ptr->total_code_vol * 7)
		size = ptr->total_code_vol * 7;

	ptr->real_code_vol = size >> 3;	/* in bytes */

	/* the MBCVR is the *maximum* block volume, according to the
	 * JPEG ISO specs, this shouldn't be used, since that allows
	 * for the best encoding quality. So set it to it's max value */
	reg = ptr->max_block_vol;
	zr36060_write(ptr, ZR060_MBCVR, reg);

	return 0;
}

/* additional control functions */
static int
zr36060_control (struct videocodec *codec,
		 int                type,
		 int                size,
		 void              *data)
{
	struct zr36060 *ptr = (struct zr36060 *) codec->data;
	int *ival = (int *) data;

	dprintk(2, "%s: control %d call with %d byte\n", ptr->name, type,
		size);

	switch (type) {
	case CODEC_G_STATUS:	/* get last status */
		if (size != sizeof(int))
			return -EFAULT;
		zr36060_read_status(ptr);
		*ival = ptr->status;
		break;

	case CODEC_G_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		*ival = CODEC_MODE_BJPG;
		break;

	case CODEC_S_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		if (*ival != CODEC_MODE_BJPG)
			return -EINVAL;
		/* not needed, do nothing */
		return 0;

	case CODEC_G_VFE:
	case CODEC_S_VFE:
		/* not needed, do nothing */
		return 0;

	case CODEC_S_MMAP:
		/* not available, give an error */
		return -ENXIO;

	case CODEC_G_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = ptr->total_code_vol;
		break;

	case CODEC_S_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->total_code_vol = *ival;
		ptr->real_code_vol = (ptr->total_code_vol * 6) >> 3;
		break;

	case CODEC_G_JPEG_SCALE:	/* get scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = zr36060_read_scalefactor(ptr);
		break;

	case CODEC_S_JPEG_SCALE:	/* set scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->scalefact = *ival;
		break;

	case CODEC_G_JPEG_APP_DATA: {	/* get appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		*app = ptr->app;
		break;
	}

	case CODEC_S_JPEG_APP_DATA: {	/* set appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		ptr->app = *app;
		break;
	}

	case CODEC_G_JPEG_COM_DATA: {	/* get comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		*com = ptr->com;
		break;
	}

	case CODEC_S_JPEG_COM_DATA: {	/* set comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		ptr->com = *com;
		break;
	}

	default:
		return -EINVAL;
	}

	return size;
}

/* =========================================================================
   Exit and unregister function:

   Deinitializes Zoran's JPEG processor
   ========================================================================= */

static int
zr36060_unset (struct videocodec *codec)
{
	struct zr36060 *ptr = codec->data;

	if (ptr) {
		/* do wee need some codec deinit here, too ???? */

		dprintk(1, "%s: finished codec #%d\n", ptr->name,
			ptr->num);
		kfree(ptr);
		codec->data = NULL;

		zr36060_codecs--;
		return 0;
	}

	return -EFAULT;
}

/* =========================================================================
   Setup and registry function:

   Initializes Zoran's JPEG processor

   Also sets pixel size, average code size, mode (compr./decompr.)
   (the given size is determined by the processor with the video interface)
   ========================================================================= */

static int
zr36060_setup (struct videocodec *codec)
{
	struct zr36060 *ptr;
	int res;

	dprintk(2, "zr36060: initializing MJPEG subsystem #%d.\n",
		zr36060_codecs);

	if (zr36060_codecs == MAX_CODECS) {
		dprintk(1,
			KERN_ERR "zr36060: Can't attach more codecs!\n");
		return -ENOSPC;
	}
	//mem structure init
	codec->data = ptr = kmalloc(sizeof(struct zr36060), GFP_KERNEL);
	if (NULL == ptr) {
		dprintk(1, KERN_ERR "zr36060: Can't get enough memory!\n");
		return -ENOMEM;
	}
	memset(ptr, 0, sizeof(struct zr36060));

	snprintf(ptr->name, sizeof(ptr->name), "zr36060[%d]",
		 zr36060_codecs);
	ptr->num = zr36060_codecs++;
	ptr->codec = codec;

	//testing
	res = zr36060_basic_test(ptr);
	if (res < 0) {
		zr36060_unset(codec);
		return res;
	}
	//final setup
	memcpy(ptr->h_samp_ratio, zr36060_decimation_h, 8);
	memcpy(ptr->v_samp_ratio, zr36060_decimation_v, 8);

	ptr->bitrate_ctrl = 0;	/* 0 or 1 - fixed file size flag
				 * (what is the difference?) */
	ptr->mode = CODEC_DO_COMPRESSION;
	ptr->width = 384;
	ptr->height = 288;
	ptr->total_code_vol = 16000;	/* CHECKME */
	ptr->real_code_vol = (ptr->total_code_vol * 6) >> 3;
	ptr->max_block_vol = 240;	/* CHECKME, was 120 is 240 */
	ptr->scalefact = 0x100;
	ptr->dri = 1;		/* CHECKME, was 8 is 1 */

	/* by default, no COM or APP markers - app should set those */
	ptr->com.len = 0;
	ptr->app.appn = 0;
	ptr->app.len = 0;

	zr36060_init(ptr);

	dprintk(1, KERN_INFO "%s: codec attached and running\n",
		ptr->name);

	return 0;
}

static const struct videocodec zr36060_codec = {
	.owner = THIS_MODULE,
	.name = "zr36060",
	.magic = 0L,		// magic not used
	.flags =
	    CODEC_FLAG_JPEG | CODEC_FLAG_HARDWARE | CODEC_FLAG_ENCODER |
	    CODEC_FLAG_DECODER | CODEC_FLAG_VFE,
	.type = CODEC_TYPE_ZR36060,
	.setup = zr36060_setup,	// functionality
	.unset = zr36060_unset,
	.set_mode = zr36060_set_mode,
	.set_video = zr36060_set_video,
	.control = zr36060_control,
	// others are not used
};

/* =========================================================================
   HOOK IN DRIVER AS KERNEL MODULE
   ========================================================================= */

static int __init
zr36060_init_module (void)
{
	//dprintk(1, "zr36060 driver %s\n",ZR060_VERSION);
	zr36060_codecs = 0;
	return videocodec_register(&zr36060_codec);
}

static void __exit
zr36060_cleanup_module (void)
{
	if (zr36060_codecs) {
		dprintk(1,
			"zr36060: something's wrong - %d codecs left somehow.\n",
			zr36060_codecs);
	} 

	/* however, we can't just stay alive */
	videocodec_unregister(&zr36060_codec);
}

module_init(zr36060_init_module);
module_exit(zr36060_cleanup_module);

MODULE_AUTHOR("Laurent Pinchart <[e-mail]>");
MODULE_DESCRIPTION("Driver module for ZR36060 jpeg processors "
		   ZR060_VERSION);
MODULE_LICENSE("GPL");