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| author | Marko Ollonen <marko.ollonen@ixonos.com> | 2013-01-23 09:39:35 +0200 |
|---|---|---|
| committer | Markus Lehtonen <markus.lehtonen@linux.intel.com> | 2013-03-04 16:14:12 +0200 |
| commit | 92fa5af276c04b2fa19d47f5fa5593d47adaec38 (patch) | |
| tree | 16c8b5b65f83cbe80194bd850f6d514ddc3b48fb | |
| parent | e7705822652e1b97326135b42aeba629326dfad8 (diff) | |
| download | kernel-mfld-blackbay-92fa5af276c04b2fa19d47f5fa5593d47adaec38.tar.gz kernel-mfld-blackbay-92fa5af276c04b2fa19d47f5fa5593d47adaec38.tar.bz2 kernel-mfld-blackbay-92fa5af276c04b2fa19d47f5fa5593d47adaec38.zip | |
camera: exposure value query to mt9e013
| -rw-r--r-- | drivers/media/video/mt9e013/mt9e013.c | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/drivers/media/video/mt9e013/mt9e013.c b/drivers/media/video/mt9e013/mt9e013.c index c40c7627236..544d4577eb4 100644 --- a/drivers/media/video/mt9e013/mt9e013.c +++ b/drivers/media/video/mt9e013/mt9e013.c @@ -63,6 +63,11 @@ * (result is 0 if b == 0) */ #define divsave_rounded(a, b) (((b) != 0) ? (((a)+((b)>>1))/(b)) : (-1)) +/* TODO: this should not be a constant but should be set by a call to + * MSIC's driver to get the ext_clk that MSIC supllies to the sensor. + */ +static const int ext_clk_freq_mhz = 19200000; + static int mt9e013_read_reg(struct i2c_client *client, u16 len, u16 reg, u16 *val) { @@ -1059,10 +1064,7 @@ mt9e013_get_intg_factor(struct i2c_client *client, unsigned int op_pix_clk_div; unsigned int op_sys_clk_div; - /* TODO: this should not be a constant but should be set by a call to - * MSIC's driver to get the ext_clk that MSIC supllies to the sensor. - */ - const int ext_clk_freq_mhz = 19200000; + struct sensor_mode_data buf; const struct mt9e013_reg *next = reglist; int vt_pix_clk_freq_mhz; @@ -1144,14 +1146,42 @@ mt9e013_get_intg_factor(struct i2c_client *client, static int mt9e013_q_exposure(struct v4l2_subdev *sd, s32 *value) { struct i2c_client *client = v4l2_get_subdevdata(sd); - u16 coarse; + unsigned int vt_pix_clk_div; + unsigned int vt_sys_clk_div; + unsigned int pre_pll_clk_div; + unsigned int pll_multiplier; + u16 data[MT9E013_SHORT_MAX]; + u16 coarse,fine,line_length_pck; + int pixel_clk_freq; int ret; - /* the fine integration time is currently not calculated */ + memset(data, 0, MT9E013_SHORT_MAX * sizeof(u16)); + if (mt9e013_read_reg(client, 12, MT9E013_VT_PIX_CLK_DIV, data)) + return -EINVAL; + vt_pix_clk_div = data[0]; + vt_sys_clk_div = data[1]; + pre_pll_clk_div = data[2]; + pll_multiplier = data[3]; + pixel_clk_freq = divsave_rounded(ext_clk_freq_mhz*pll_multiplier, + pre_pll_clk_div*vt_sys_clk_div*vt_pix_clk_div); + + + memset(data, 0, MT9E013_SHORT_MAX * sizeof(u16)); + ret = mt9e013_read_reg(client, 4, + MT9E013_COARSE_INTEGRATION_TIME, data); + coarse = data[0]; + fine = data[1]; + ret = mt9e013_read_reg(client, MT9E013_16BIT, - MT9E013_COARSE_INTEGRATION_TIME, &coarse); - *value = coarse; + MT9E013_LINE_LENGTH_PCK, data); + line_length_pck = data[0]; + /* divide meaninless zeros already in numerator to + * get numerator fit to 16 bit. + */ + pixel_clk_freq = pixel_clk_freq / 100000; + *value = (((coarse * line_length_pck + fine)/100000) << 16) + + pixel_clk_freq; return ret; } @@ -1250,7 +1280,7 @@ static struct mt9e013_control mt9e013_controls[] = { .type = V4L2_CTRL_TYPE_INTEGER, .name = "exposure", .minimum = 0x0, - .maximum = 0xffff, + .maximum = 0xffffffff, .step = 0x01, .default_value = 0x00, .flags = 0, |