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| author | Johannes Obermaier <johannes.obermaier@gmail.com> | 2011-06-02 12:43:14 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-07-27 17:52:25 -0300 |
| commit | 590929f32adc3aaa702c287b624a0d0382730088 (patch) | |
| tree | 6d6e194c9d52ede5cd21170298f81a0f05b30282 /drivers/media/video | |
| parent | 1048af2f810b3d08210c600ca3c8e84877edbbc7 (diff) | |
| download | linux-590929f32adc3aaa702c287b624a0d0382730088.tar.gz linux-590929f32adc3aaa702c287b624a0d0382730088.tar.bz2 linux-590929f32adc3aaa702c287b624a0d0382730088.zip | |
[media] mt9v011: Added exposure for mt9v011
There are problems when you use this camera/sensor in a very bright room
or outside. The image is completely white, because it is overexposed.
The driver uses a default value which is not suitable for all
environments.
This patch makes it possible to adjust the exposure time by youself. I
found out by logging the i2c-data, that the windows driver for this
sensor is doing this, too. I tested the camera on a sunny day and after
adjusting the exposure time, I was able to see a very good image.
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Johannes Obermaier <johannes.obermaier@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video')
| -rw-r--r-- | drivers/media/video/mt9v011.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/media/video/mt9v011.c b/drivers/media/video/mt9v011.c index a6cf05aa4550..fbbd018c94ab 100644 --- a/drivers/media/video/mt9v011.c +++ b/drivers/media/video/mt9v011.c @@ -59,6 +59,15 @@ static struct v4l2_queryctrl mt9v011_qctrl[] = { .default_value = 0x0020, .flags = 0, }, { + .id = V4L2_CID_EXPOSURE, + .type = V4L2_CTRL_TYPE_INTEGER, + .name = "Exposure", + .minimum = 0, + .maximum = 2047, + .step = 1, + .default_value = 0x01fc, + .flags = 0, + }, { .id = V4L2_CID_RED_BALANCE, .type = V4L2_CTRL_TYPE_INTEGER, .name = "Red Balance", @@ -105,7 +114,7 @@ struct mt9v011 { unsigned hflip:1; unsigned vflip:1; - u16 global_gain, red_bal, blue_bal; + u16 global_gain, exposure, red_bal, blue_bal; }; static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd) @@ -184,6 +193,9 @@ static void set_balance(struct v4l2_subdev *sd) { struct mt9v011 *core = to_mt9v011(sd); u16 green1_gain, green2_gain, blue_gain, red_gain; + u16 exposure; + + exposure = core->exposure; green1_gain = core->global_gain; green2_gain = core->global_gain; @@ -198,6 +210,7 @@ static void set_balance(struct v4l2_subdev *sd) mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green1_gain); mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain); mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain); + mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure); } static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator) @@ -338,6 +351,9 @@ static int mt9v011_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) case V4L2_CID_GAIN: ctrl->value = core->global_gain; return 0; + case V4L2_CID_EXPOSURE: + ctrl->value = core->exposure; + return 0; case V4L2_CID_RED_BALANCE: ctrl->value = core->red_bal; return 0; @@ -392,6 +408,9 @@ static int mt9v011_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) case V4L2_CID_GAIN: core->global_gain = ctrl->value; break; + case V4L2_CID_EXPOSURE: + core->exposure = ctrl->value; + break; case V4L2_CID_RED_BALANCE: core->red_bal = ctrl->value; break; @@ -598,6 +617,7 @@ static int mt9v011_probe(struct i2c_client *c, } core->global_gain = 0x0024; + core->exposure = 0x01fc; core->width = 640; core->height = 480; core->xtal = 27000000; /* Hz */ |