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Commit 590929f3 authored by Johannes Obermaier's avatar Johannes Obermaier Committed by Mauro Carvalho Chehab
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[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: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: default avatarJohannes Obermaier <johannes.obermaier@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 1048af2f

drivers/media/video/mt9v011.c

+21 −1
Original line number Diff line number Diff line
@@ -58,6 +58,15 @@ static struct v4l2_queryctrl mt9v011_qctrl[] = { 
		.step = 1,

		.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,
@@ -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 */