V4L/DVB (11117): ov7670: add support to get/set registers

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index ab245f71b195..0e2184ec994e 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -1180,6 +1180,36 @@ static int ov7670_g_chip_ident(struct v4l2_subdev *sd,
         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_OV7670, 0);
 }
 
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int ov7670_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+        unsigned char val = 0;
+        int ret;
+
+        if (!v4l2_chip_match_i2c_client(client, &reg->match))
+                return -EINVAL;
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        ret = ov7670_read(sd, reg->reg & 0xff, &val);
+        reg->val = val;
+        reg->size = 1;
+        return ret;
+}
+
+static int ov7670_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        if (!v4l2_chip_match_i2c_client(client, &reg->match))
+                return -EINVAL;
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        ov7670_write(sd, reg->reg & 0xff, reg->val & 0xff);
+        return 0;
+}
+#endif
+
 /* ----------------------------------------------------------------------- */
 
 static const struct v4l2_subdev_core_ops ov7670_core_ops = {
@@ -1189,6 +1219,10 @@ static const struct v4l2_subdev_core_ops ov7670_core_ops = {
         .queryctrl = ov7670_queryctrl,
         .reset = ov7670_reset,
         .init = ov7670_init,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+        .g_register = ov7670_g_register,
+        .s_register = ov7670_s_register,
+#endif
 };
 
 static const struct v4l2_subdev_video_ops ov7670_video_ops = {