From 364e93372fb21ef5de18d0122c78789f065ddbf5 Mon Sep 17 00:00:00 2001 From: Jonathan Corbet Date: Fri, 5 Mar 2010 16:48:39 -0300 Subject: [PATCH] V4L/DVB: ov7670: wire up controls for exposure and autoexposure Signed-off-by: Jonathan Corbet Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/ov7670.c | 86 ++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c index e7555d1f90e6..90c44598dd51 100644 --- a/drivers/media/video/ov7670.c +++ b/drivers/media/video/ov7670.c @@ -1190,6 +1190,79 @@ static int ov7670_s_autogain(struct v4l2_subdev *sd, int value) return ret; } +/* + * Exposure is spread all over the place: top 6 bits in AECHH, middle + * 8 in AECH, and two stashed in COM1 just for the hell of it. + */ +static int ov7670_g_exp(struct v4l2_subdev *sd, __s32 *value) +{ + int ret; + unsigned char com1, aech, aechh; + + ret = ov7670_read(sd, REG_COM1, &com1) + + ov7670_read(sd, REG_AECH, &aech) + + ov7670_read(sd, REG_AECHH, &aechh); + *value = ((aechh & 0x3f) << 10) | (aech << 2) | (com1 & 0x03); + return ret; +} + +static int ov7670_s_exp(struct v4l2_subdev *sd, int value) +{ + int ret; + unsigned char com1, com8, aech, aechh; + + ret = ov7670_read(sd, REG_COM1, &com1) + + ov7670_read(sd, REG_COM8, &com8); + ov7670_read(sd, REG_AECHH, &aechh); + if (ret) + return ret; + + com1 = (com1 & 0xfc) | (value & 0x03); + aech = (value >> 2) & 0xff; + aechh = (aechh & 0xc0) | ((value >> 10) & 0x3f); + ret = ov7670_write(sd, REG_COM1, com1) + + ov7670_write(sd, REG_AECH, aech) + + ov7670_write(sd, REG_AECHH, aechh); + /* Have to turn off AEC as well */ + if (ret == 0) + ret = ov7670_write(sd, REG_COM8, com8 & ~COM8_AEC); + return ret; +} + +/* + * Tweak autoexposure. + */ +static int ov7670_g_autoexp(struct v4l2_subdev *sd, __s32 *value) +{ + int ret; + unsigned char com8; + enum v4l2_exposure_auto_type *atype = (enum v4l2_exposure_auto_type *) value; + + ret = ov7670_read(sd, REG_COM8, &com8); + if (com8 & COM8_AEC) + *value = V4L2_EXPOSURE_AUTO; + else + *value = V4L2_EXPOSURE_MANUAL; + return ret; +} + +static int ov7670_s_autoexp(struct v4l2_subdev *sd, + enum v4l2_exposure_auto_type value) +{ + int ret; + unsigned char com8; + + ret = ov7670_read(sd, REG_COM8, &com8); + if (ret == 0) { + if (value == V4L2_EXPOSURE_AUTO) + com8 |= COM8_AEC; + else + com8 &= ~COM8_AEC; + ret = ov7670_write(sd, REG_COM8, com8); + } + return ret; +} + static int ov7670_queryctrl(struct v4l2_subdev *sd, @@ -1212,6 +1285,10 @@ static int ov7670_queryctrl(struct v4l2_subdev *sd, return v4l2_ctrl_query_fill(qc, 0, 255, 1, 128); case V4L2_CID_AUTOGAIN: return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); + case V4L2_CID_EXPOSURE: + return v4l2_ctrl_query_fill(qc, 0, 65535, 1, 500); + case V4L2_CID_EXPOSURE_AUTO: + return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0); } return -EINVAL; } @@ -1235,6 +1312,10 @@ static int ov7670_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) return ov7670_g_gain(sd, &ctrl->value); case V4L2_CID_AUTOGAIN: return ov7670_g_autogain(sd, &ctrl->value); + case V4L2_CID_EXPOSURE: + return ov7670_g_exp(sd, &ctrl->value); + case V4L2_CID_EXPOSURE_AUTO: + return ov7670_g_autoexp(sd, &ctrl->value); } return -EINVAL; } @@ -1258,6 +1339,11 @@ static int ov7670_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) return ov7670_s_gain(sd, ctrl->value); case V4L2_CID_AUTOGAIN: return ov7670_s_autogain(sd, ctrl->value); + case V4L2_CID_EXPOSURE: + return ov7670_s_exp(sd, ctrl->value); + case V4L2_CID_EXPOSURE_AUTO: + return ov7670_s_autoexp(sd, + (enum v4l2_exposure_auto_type) ctrl->value); } return -EINVAL; } -- 2.30.2