V4L/DVB (5469): Add raw bayer support to the ov7670 driver

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/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index 639fc2367832..03bc369a9e49 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -165,6 +165,10 @@ 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 */
@@ -383,6 +387,13 @@ 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 },
+};
 
 
 
@@ -486,32 +497,39 @@ 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.
@@ -688,7 +706,7 @@ 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;
 }