6/7 Add raw bayer support to the ov7670 driver

From: Jonathan Corbet <corbet@lwn.net>

Add raw bayer support to the ov7670 driver

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 24 insertions, 6 deletions

diff --git a/linux/drivers/media/video/ov7670.c b/linux/drivers/media/video/ov7670.c
index 2e215dc52..9ecf35fb1 100644
--- a/linux/drivers/media/video/ov7670.c
+++ b/linux/drivers/media/video/ov7670.c
@@ -164,6 +164,10 @@ MODULE_LICENSE("GPL");
 
 #define REG_GFIX	0x69	/* Fix gain control */
 
+#define REG_REG76	0x76	/* OV's name */
+#define   R76_BLKPCOR	  0x80	  /* Black pixel correction enable */
+#define   R76_WHTPCOR	  0x40	  /* White pixel correction enable */
+
 #define REG_RGB444	0x8c	/* RGB 444 control */
 #define   R444_ENABLE	  0x02	  /* Turn on RGB444, overrides 5x5 */
 #define   R444_RGBX	  0x01	  /* Empty nibble at end */
@@ -382,6 +386,13 @@ static struct regval_list ov7670_fmt_rgb444[] = {
 	{ 0xff, 0xff },
 };
 
+static struct regval_list ov7670_fmt_raw[] = {
+	{ REG_COM7, COM7_BAYER },
+	{ REG_COM13, 0x08 }, /* No gamma, magic rsvd bit */
+	{ REG_COM16, 0x3d }, /* Edge enhancement, denoise */
+	{ REG_REG76, 0xe1 }, /* Pix correction, magic rsvd */
+	{ 0xff, 0xff },
+};
 
 
 
@@ -506,32 +517,39 @@ static struct ov7670_format_struct {
 	__u32 pixelformat;
 	struct regval_list *regs;
 	int cmatrix[CMATRIX_LEN];
+	int bpp;   /* Bytes per pixel */
 } ov7670_formats[] = {
 	{
 		.desc		= "YUYV 4:2:2",
 		.pixelformat	= V4L2_PIX_FMT_YUYV,
 		.regs 		= ov7670_fmt_yuv422,
 		.cmatrix	= { 128, -128, 0, -34, -94, 128 },
+		.bpp		= 2,
 	},
 	{
 		.desc		= "RGB 444",
 		.pixelformat	= V4L2_PIX_FMT_RGB444,
 		.regs		= ov7670_fmt_rgb444,
 		.cmatrix	= { 179, -179, 0, -61, -176, 228 },
+		.bpp		= 2,
 	},
 	{
 		.desc		= "RGB 565",
 		.pixelformat	= V4L2_PIX_FMT_RGB565,
 		.regs		= ov7670_fmt_rgb565,
 		.cmatrix	= { 179, -179, 0, -61, -176, 228 },
+		.bpp		= 2,
+	},
+	{
+		.desc		= "Raw RGB Bayer",
+		.pixelformat	= V4L2_PIX_FMT_SBGGR8,
+		.regs 		= ov7670_fmt_raw,
+		.cmatrix	= { 0, 0, 0, 0, 0, 0 },
+		.bpp		= 1
 	},
 };
-#define N_OV7670_FMTS (sizeof(ov7670_formats)/sizeof(ov7670_formats[0]))
+#define N_OV7670_FMTS ARRAY_SIZE(ov7670_formats)
 
-/*
- * All formats we support are 2 bytes/pixel.
- */
-#define BYTES_PER_PIXEL 2
 
 /*
  * Then there is the issue of window sizes.  Try to capture the info here.
@@ -708,7 +726,7 @@ static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt,
 	 */
 	pix->width = wsize->width;
 	pix->height = wsize->height;
-	pix->bytesperline = pix->width*BYTES_PER_PIXEL;
+	pix->bytesperline = pix->width*ov7670_formats[index].bpp;
 	pix->sizeimage = pix->height*pix->bytesperline;
 	return 0;
 }