[PATCH v4 1/2] media: atmel: atmel-isc-base: expose white balance as v4l2 controls
From: Eugen.Hristev
Date: Mon Jan 13 2020 - 04:48:59 EST
From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
This exposes the white balance configuration of the ISC as v4l2 controls
into userspace.
There are 8 controls available:
4 gain controls , sliders, for each of the BAYER components: R, B, GR, GB.
These gains are multipliers for each component, in format unsigned 0:4:9 with
a default value of 512 (1.0 multiplier).
4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.
These offsets are added/substracted from each component, in format signed
1:12:0 with a default value of 0 (+/- 0)
To expose this to userspace, added 8 custom controls, in an auto cluster.
To summarize the functionality:
The auto cluster switch is the auto white balance control, and it works
like this:
AWB ==1 : autowhitebalance is on, the do_white_balance button is inactive,
the gains/offsets are inactive, but volatile and readable.
Thus, the results of the whitebalance algorithm are available to userspace to
read at any time.
AWB ==0: autowhitebalance is off, cluster is in manual mode, user can configure
the gain/offsets directly. More than that, if the do_white_balance button is
pressed, the driver will perform one-time-adjustment, (preferably with color
checker card) and the userspace can read again the new values.
With this feature, the userspace can save the coefficients and reinstall them
for example after reboot or reprobing the driver.
Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
---
Changes in v4:
- Added to include/linux-atmel-isc-media.h comments explaining the controls
- renamed weird 'component balance' to correct name: 'gain'
So now we have 'gain controls' and 'offset controls' which all together form the
'white balance controls'
Changes in v3:
- Moved controls definition on separate header as done in imx driver
- reserved range of user controls in v4l2-controls.h
Changes in v2:
- Created some macros to make the code smaller, for declaring the bal/off
controls, and to convert to 2's complements required values (0 to ZERO_VAL)
Compliance test for atmel-isc device /dev/vatmel-isc f0008000.isc: ================= START STATUS =================
v4l2-ctrls: atmel-isc f0008000.isc: Brightness: 0
v4l2-ctrls: atmel-isc f0008000.isc: Contrast: 256
Driver Info:
Driver name : atmel-isc
Card type : Atmel Image Sensor Controller
Bus info : platform:atmel-isc f0008000.isc
Driver version : 5.5.0
Capabilities : 0x84200001
Video Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
Required ioctls:
test VIDIOC_QUERYCAP: OK
Allow for multiple opens:
test second /dev/video0 open: OK
test VIDIOC_QUERYCAP: OK
test VIDIOC_G/S_PRIORITY: OK
test for unlimited opens: OK
Debug ioctls:
test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
v4l2-ctrls: atmel-isc f0008000.isc: Gamma: 2
v4l2-ctrls: atmel-isc f0008000.isc: White Balance, Automatic: true
v4l2-ctrls: atmel-isc f0008000.isc: Red Component Gain: 512 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Blue Component Gain: 512 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Green Red Component Gain: 512 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Green Blue Component Gain: 512 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Red Component Offset: 0 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Blue Component Offset: 0 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Green Red Component Offset: 0 inactive volatile
v4l2-ctrls: atmel-isc f0008000.isc: Green Blue Component Offset: 0 inactive volatile
atmel-isc f0008000.isc: ================== END STATUS ==================
test VIDIOC_LOG_STATUS: OK
Input ioctls:
test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
test VIDIOC_ENUMAUDIO: OK (Not Supported)
test VIDIOC_G/S/ENUMINPUT: OK
test VIDIOC_G/S_AUDIO: OK (Not Supported)
Inputs: 1 Audio Inputs: 0 Tuners: 0
Output ioctls:
test VIDIOC_G/S_MODULATOR: OK (Not Supported)
test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
test VIDIOC_ENUMAUDOUT: OK (Not Supported)
test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
test VIDIOC_G/S_AUDOUT: OK (Not Supported)
Outputs: 0 Audio Outputs: 0 Modulators: 0
Input/Output configuration ioctls:
test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
test VIDIOC_G/S_EDID: OK (Not Supported)
Control ioctls (Input 0):
test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
test VIDIOC_QUERYCTRL: OK
test VIDIOC_G/S_CTRL: OK
test VIDIOC_G/S/TRY_EXT_CTRLS: OK
test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
Standard Controls: 6 Private Controls: 8
Format ioctls (Input 0):
test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
test VIDIOC_G/S_PARM: OK
test VIDIOC_G_FBUF: OK (Not Supported)
test VIDIOC_G_FMT: OK
test VIDIOC_TRY_FMT: OK
test VIDIOC_S_FMT: OK
test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
test Cropping: OK (Not Supported)
test Composing: OK (Not Supported)
test Scaling: OK (Not Supported)
Codec ioctls (Input 0):
test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
test VIDIOC_G_ENC_INDEX: OK (Not Supported)
test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)
Buffer ioctls (Input 0):
test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
test VIDIOC_EXPBUF: OK
test Requests: OK (Not Supported)
Total for atmel-isc device /dev/video0: 44, Succeeded: 44, Failed: 0, Warnings: 0
# v4l2-ctl -L
User Controls
brightness 0x00980900 (int) : min=-1024 max=1023 step=1 default=0 value=0 flags=slider
contrast 0x00980901 (int) : min=-2048 max=2047 step=1 default=256 value=256 flags=slider
white_balance_automatic 0x0098090c (bool) : default=1 value=1 flags=update
do_white_balance 0x0098090d (button) : flags=inactive, write-only, volatile, execute-on-write
gamma 0x00980910 (int) : min=0 max=2 step=1 default=2 value=2 flags=slider
red_component_gain 0x009819c0 (int) : min=0 max=8191 step=1 default=512 value=512 flags=inactive, slider, volatile
blue_component_gain 0x009819c1 (int) : min=0 max=8191 step=1 default=512 value=512 flags=inactive, slider, volatile
green_red_component_gain 0x009819c2 (int) : min=0 max=8191 step=1 default=512 value=512 flags=inactive, slider, volatile
green_blue_component_gain 0x009819c3 (int) : min=0 max=8191 step=1 default=512 value=512 flags=inactive, slider, volatile
red_component_offset 0x009819c4 (int) : min=-4095 max=4095 step=1 default=0 value=0 flags=inactive, slider, volatile
blue_component_offset 0x009819c5 (int) : min=-4095 max=4095 step=1 default=0 value=0 flags=inactive, slider, volatile
green_red_component_offset 0x009819c6 (int) : min=-4095 max=4095 step=1 default=0 value=0 flags=inactive, slider, volatile
green_blue_component_offset 0x009819c7 (int) : min=-4095 max=4095 step=1 default=0 value=0 flags=inactive, slider, volatile
#
drivers/media/platform/atmel/atmel-isc-base.c | 222 ++++++++++++++++++++++----
drivers/media/platform/atmel/atmel-isc.h | 23 ++-
include/linux/atmel-isc-media.h | 58 +++++++
include/uapi/linux/v4l2-controls.h | 4 +
4 files changed, 279 insertions(+), 28 deletions(-)
create mode 100644 include/linux/atmel-isc-media.h
diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index d7669a0..b6c9a78 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -22,6 +22,7 @@
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/videodev2.h>
+#include <linux/atmel-isc-media.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
@@ -224,10 +225,35 @@ const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES] = {
(((mbus_code) == MEDIA_BUS_FMT_Y10_1X10) | \
(((mbus_code) == MEDIA_BUS_FMT_Y8_1X8)))
+#define ISC_CTRL_ISC_TO_V4L2(x) ((x) == ISC_WB_O_ZERO_VAL ? 0 : (x))
+#define ISC_CTRL_V4L2_TO_ISC(x) ((x) ? (x) : ISC_WB_O_ZERO_VAL)
+
+static inline void isc_update_v4l2_ctrls(struct isc_device *isc)
+{
+ struct isc_ctrls *ctrls = &isc->ctrls;
+
+ /* In here we set the v4l2 controls w.r.t. our pipeline config */
+ v4l2_ctrl_s_ctrl(isc->r_gain_ctrl, ctrls->gain[ISC_HIS_CFG_MODE_R]);
+ v4l2_ctrl_s_ctrl(isc->b_gain_ctrl, ctrls->gain[ISC_HIS_CFG_MODE_B]);
+ v4l2_ctrl_s_ctrl(isc->gr_gain_ctrl, ctrls->gain[ISC_HIS_CFG_MODE_GR]);
+ v4l2_ctrl_s_ctrl(isc->gb_gain_ctrl, ctrls->gain[ISC_HIS_CFG_MODE_GB]);
+
+ v4l2_ctrl_s_ctrl(isc->r_off_ctrl,
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_R]));
+ v4l2_ctrl_s_ctrl(isc->b_off_ctrl,
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_B]));
+ v4l2_ctrl_s_ctrl(isc->gr_off_ctrl,
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_GR]));
+ v4l2_ctrl_s_ctrl(isc->gb_off_ctrl,
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_GB]));
+}
+
static inline void isc_update_awb_ctrls(struct isc_device *isc)
{
struct isc_ctrls *ctrls = &isc->ctrls;
+ /* In here we set our actual hw pipeline config */
+
regmap_write(isc->regmap, ISC_WB_O_RGR,
(ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_R])) |
((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GR]) << 16));
@@ -662,11 +688,9 @@ static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
bay_cfg = isc->config.sd_format->cfa_baycfg;
- if (ctrls->awb == ISC_WB_NONE)
- isc_reset_awb_ctrls(isc);
-
regmap_write(regmap, ISC_WB_CFG, bay_cfg);
isc_update_awb_ctrls(isc);
+ isc_update_v4l2_ctrls(isc);
regmap_write(regmap, ISC_CFA_CFG, bay_cfg | ISC_CFA_CFG_EITPOL);
@@ -1396,6 +1420,7 @@ static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
isc->try_config.sd_format != isc->config.sd_format) {
isc->ctrls.hist_stat = HIST_INIT;
isc_reset_awb_ctrls(isc);
+ isc_update_v4l2_ctrls(isc);
}
/* make the try configuration active */
isc->config = isc->try_config;
@@ -1814,10 +1839,6 @@ static void isc_awb_work(struct work_struct *w)
ctrls->hist_id = hist_id;
baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
- /* if no more auto white balance, reset controls. */
- if (ctrls->awb == ISC_WB_NONE)
- isc_reset_awb_ctrls(isc);
-
pm_runtime_get_sync(isc->dev);
/*
@@ -1842,6 +1863,8 @@ static void isc_awb_work(struct work_struct *w)
if (ctrls->awb == ISC_WB_ONETIME) {
v4l2_info(&isc->v4l2_dev,
"Completed one time white-balance adjustment.\n");
+ /* update the v4l2 controls values */
+ isc_update_v4l2_ctrls(isc);
ctrls->awb = ISC_WB_NONE;
}
}
@@ -1873,6 +1896,27 @@ static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_GAMMA:
ctrls->gamma_index = ctrl->val;
break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_ctrl_ops isc_ctrl_ops = {
+ .s_ctrl = isc_s_ctrl,
+};
+
+static int isc_s_awb_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct isc_device *isc = container_of(ctrl->handler,
+ struct isc_device, ctrls.handler);
+ struct isc_ctrls *ctrls = &isc->ctrls;
+
+ if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
+ return 0;
+
+ switch (ctrl->id) {
case V4L2_CID_AUTO_WHITE_BALANCE:
if (ctrl->val == 1)
ctrls->awb = ISC_WB_AUTO;
@@ -1883,36 +1927,142 @@ static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
if (!isc->config.sd_format)
break;
- if (ctrls->hist_stat != HIST_ENABLED)
- isc_reset_awb_ctrls(isc);
+ /* configure the controls with new values from v4l2 */
+ if (ctrl->cluster[ISC_CTRL_R_GAIN]->is_new)
+ ctrls->gain[ISC_HIS_CFG_MODE_R] = isc->r_gain_ctrl->val;
+ if (ctrl->cluster[ISC_CTRL_B_GAIN]->is_new)
+ ctrls->gain[ISC_HIS_CFG_MODE_B] = isc->b_gain_ctrl->val;
+ if (ctrl->cluster[ISC_CTRL_GR_GAIN]->is_new)
+ ctrls->gain[ISC_HIS_CFG_MODE_GR] = isc->gr_gain_ctrl->val;
+ if (ctrl->cluster[ISC_CTRL_GB_GAIN]->is_new)
+ ctrls->gain[ISC_HIS_CFG_MODE_GB] = isc->gb_gain_ctrl->val;
+
+ if (ctrl->cluster[ISC_CTRL_R_OFF]->is_new)
+ ctrls->offset[ISC_HIS_CFG_MODE_R] =
+ ISC_CTRL_V4L2_TO_ISC(isc->r_off_ctrl->val);
+ if (ctrl->cluster[ISC_CTRL_B_OFF]->is_new)
+ ctrls->offset[ISC_HIS_CFG_MODE_B] =
+ ISC_CTRL_V4L2_TO_ISC(isc->b_off_ctrl->val);
+ if (ctrl->cluster[ISC_CTRL_GR_OFF]->is_new)
+ ctrls->offset[ISC_HIS_CFG_MODE_GR] =
+ ISC_CTRL_V4L2_TO_ISC(isc->gr_off_ctrl->val);
+ if (ctrl->cluster[ISC_CTRL_GB_OFF]->is_new)
+ ctrls->offset[ISC_HIS_CFG_MODE_GB] =
+ ISC_CTRL_V4L2_TO_ISC(isc->gb_off_ctrl->val);
- if (isc->ctrls.awb == ISC_WB_AUTO &&
+ isc_update_awb_ctrls(isc);
+
+ if (vb2_is_streaming(&isc->vb2_vidq)) {
+ /*
+ * If we are streaming, we can update profile to
+ * have the new settings in place.
+ */
+ isc_update_profile(isc);
+ } else {
+ /*
+ * The auto cluster will activate automatically this
+ * control. This has to be deactivated when not
+ * streaming.
+ */
+ v4l2_ctrl_activate(isc->do_wb_ctrl, false);
+ }
+
+ /* if we have autowhitebalance on, start histogram procedure */
+ if (ctrls->awb == ISC_WB_AUTO &&
vb2_is_streaming(&isc->vb2_vidq) &&
ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
isc_set_histogram(isc, true);
- break;
- case V4L2_CID_DO_WHITE_BALANCE:
- /* if AWB is enabled, do nothing */
- if (ctrls->awb == ISC_WB_AUTO)
- return 0;
+ /*
+ * for one time whitebalance adjustment, check the button,
+ * if it's pressed, perform the one time operation.
+ */
+ if (ctrls->awb == ISC_WB_NONE &&
+ ctrl->cluster[ISC_CTRL_DO_WB]->is_new &&
+ !(ctrl->cluster[ISC_CTRL_DO_WB]->flags &
+ V4L2_CTRL_FLAG_INACTIVE)) {
+ ctrls->awb = ISC_WB_ONETIME;
+ isc_set_histogram(isc, true);
+ v4l2_dbg(1, debug, &isc->v4l2_dev,
+ "One time white-balance started.\n");
+ }
+ return 0;
+ }
+ return 0;
+}
- ctrls->awb = ISC_WB_ONETIME;
- isc_set_histogram(isc, true);
- v4l2_dbg(1, debug, &isc->v4l2_dev,
- "One time white-balance started.\n");
+static int isc_g_volatile_awb_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct isc_device *isc = container_of(ctrl->handler,
+ struct isc_device, ctrls.handler);
+ struct isc_ctrls *ctrls = &isc->ctrls;
+
+ switch (ctrl->id) {
+ /* being a cluster, this id will be called for every control */
+ case V4L2_CID_AUTO_WHITE_BALANCE:
+ ctrl->cluster[ISC_CTRL_R_GAIN]->val =
+ ctrls->gain[ISC_HIS_CFG_MODE_R];
+ ctrl->cluster[ISC_CTRL_B_GAIN]->val =
+ ctrls->gain[ISC_HIS_CFG_MODE_B];
+ ctrl->cluster[ISC_CTRL_GR_GAIN]->val =
+ ctrls->gain[ISC_HIS_CFG_MODE_GR];
+ ctrl->cluster[ISC_CTRL_GB_GAIN]->val =
+ ctrls->gain[ISC_HIS_CFG_MODE_GB];
+
+ ctrl->cluster[ISC_CTRL_R_OFF]->val =
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_R]);
+ ctrl->cluster[ISC_CTRL_B_OFF]->val =
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_B]);
+ ctrl->cluster[ISC_CTRL_GR_OFF]->val =
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_GR]);
+ ctrl->cluster[ISC_CTRL_GB_OFF]->val =
+ ISC_CTRL_ISC_TO_V4L2(ctrls->offset[ISC_HIS_CFG_MODE_GB]);
break;
- default:
- return -EINVAL;
}
-
return 0;
}
-static const struct v4l2_ctrl_ops isc_ctrl_ops = {
- .s_ctrl = isc_s_ctrl,
+static const struct v4l2_ctrl_ops isc_awb_ops = {
+ .s_ctrl = isc_s_awb_ctrl,
+ .g_volatile_ctrl = isc_g_volatile_awb_ctrl,
};
+#define ISC_CTRL_OFF(_name, _id, _name_str) \
+ static const struct v4l2_ctrl_config _name = { \
+ .ops = &isc_awb_ops, \
+ .id = _id, \
+ .name = _name_str, \
+ .type = V4L2_CTRL_TYPE_INTEGER, \
+ .flags = V4L2_CTRL_FLAG_SLIDER, \
+ .min = -4095, \
+ .max = 4095, \
+ .step = 1, \
+ .def = 0, \
+ }
+
+ISC_CTRL_OFF(isc_r_off_ctrl, ISC_CID_R_OFFSET, "Red Component Offset");
+ISC_CTRL_OFF(isc_b_off_ctrl, ISC_CID_B_OFFSET, "Blue Component Offset");
+ISC_CTRL_OFF(isc_gr_off_ctrl, ISC_CID_GR_OFFSET, "Green Red Component Offset");
+ISC_CTRL_OFF(isc_gb_off_ctrl, ISC_CID_GB_OFFSET, "Green Blue Component Offset");
+
+#define ISC_CTRL_GAIN(_name, _id, _name_str) \
+ static const struct v4l2_ctrl_config _name = { \
+ .ops = &isc_awb_ops, \
+ .id = _id, \
+ .name = _name_str, \
+ .type = V4L2_CTRL_TYPE_INTEGER, \
+ .flags = V4L2_CTRL_FLAG_SLIDER, \
+ .min = 0, \
+ .max = 8191, \
+ .step = 1, \
+ .def = 512, \
+ }
+
+ISC_CTRL_GAIN(isc_r_gain_ctrl, ISC_CID_R_GAIN, "Red Component Gain");
+ISC_CTRL_GAIN(isc_b_gain_ctrl, ISC_CID_B_GAIN, "Blue Component Gain");
+ISC_CTRL_GAIN(isc_gr_gain_ctrl, ISC_CID_GR_GAIN, "Green Red Component Gain");
+ISC_CTRL_GAIN(isc_gb_gain_ctrl, ISC_CID_GB_GAIN, "Green Blue Component Gain");
+
static int isc_ctrl_init(struct isc_device *isc)
{
const struct v4l2_ctrl_ops *ops = &isc_ctrl_ops;
@@ -1923,7 +2073,7 @@ static int isc_ctrl_init(struct isc_device *isc)
ctrls->hist_stat = HIST_INIT;
isc_reset_awb_ctrls(isc);
- ret = v4l2_ctrl_handler_init(hdl, 5);
+ ret = v4l2_ctrl_handler_init(hdl, 13);
if (ret < 0)
return ret;
@@ -1933,10 +2083,13 @@ static int isc_ctrl_init(struct isc_device *isc)
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -1024, 1023, 1, 0);
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -2048, 2047, 1, 256);
v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAMMA, 0, GAMMA_MAX, 1, 2);
- v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
+ isc->awb_ctrl = v4l2_ctrl_new_std(hdl, &isc_awb_ops,
+ V4L2_CID_AUTO_WHITE_BALANCE,
+ 0, 1, 1, 1);
/* do_white_balance is a button, so min,max,step,default are ignored */
- isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DO_WHITE_BALANCE,
+ isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, &isc_awb_ops,
+ V4L2_CID_DO_WHITE_BALANCE,
0, 0, 0, 0);
if (!isc->do_wb_ctrl) {
@@ -1947,6 +2100,21 @@ static int isc_ctrl_init(struct isc_device *isc)
v4l2_ctrl_activate(isc->do_wb_ctrl, false);
+ isc->r_gain_ctrl = v4l2_ctrl_new_custom(hdl, &isc_r_gain_ctrl, NULL);
+ isc->b_gain_ctrl = v4l2_ctrl_new_custom(hdl, &isc_b_gain_ctrl, NULL);
+ isc->gr_gain_ctrl = v4l2_ctrl_new_custom(hdl, &isc_gr_gain_ctrl, NULL);
+ isc->gb_gain_ctrl = v4l2_ctrl_new_custom(hdl, &isc_gb_gain_ctrl, NULL);
+ isc->r_off_ctrl = v4l2_ctrl_new_custom(hdl, &isc_r_off_ctrl, NULL);
+ isc->b_off_ctrl = v4l2_ctrl_new_custom(hdl, &isc_b_off_ctrl, NULL);
+ isc->gr_off_ctrl = v4l2_ctrl_new_custom(hdl, &isc_gr_off_ctrl, NULL);
+ isc->gb_off_ctrl = v4l2_ctrl_new_custom(hdl, &isc_gb_off_ctrl, NULL);
+
+ /*
+ * The cluster is in auto mode with autowhitebalance enabled
+ * and manual mode otherwise.
+ */
+ v4l2_ctrl_auto_cluster(10, &isc->awb_ctrl, 0, true);
+
v4l2_ctrl_handler_setup(hdl);
return 0;
diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
index bfaed2f..fc56a74 100644
--- a/drivers/media/platform/atmel/atmel-isc.h
+++ b/drivers/media/platform/atmel/atmel-isc.h
@@ -213,7 +213,6 @@ struct isc_device {
struct fmt_config try_config;
struct isc_ctrls ctrls;
- struct v4l2_ctrl *do_wb_ctrl;
struct work_struct awb_work;
struct mutex lock; /* serialize access to file operations */
@@ -223,6 +222,28 @@ struct isc_device {
struct isc_subdev_entity *current_subdev;
struct list_head subdev_entities;
+
+ struct {
+#define ISC_CTRL_DO_WB 1
+#define ISC_CTRL_R_GAIN 2
+#define ISC_CTRL_B_GAIN 3
+#define ISC_CTRL_GR_GAIN 4
+#define ISC_CTRL_GB_GAIN 5
+#define ISC_CTRL_R_OFF 6
+#define ISC_CTRL_B_OFF 7
+#define ISC_CTRL_GR_OFF 8
+#define ISC_CTRL_GB_OFF 9
+ struct v4l2_ctrl *awb_ctrl;
+ struct v4l2_ctrl *do_wb_ctrl;
+ struct v4l2_ctrl *r_gain_ctrl;
+ struct v4l2_ctrl *b_gain_ctrl;
+ struct v4l2_ctrl *gr_gain_ctrl;
+ struct v4l2_ctrl *gb_gain_ctrl;
+ struct v4l2_ctrl *r_off_ctrl;
+ struct v4l2_ctrl *b_off_ctrl;
+ struct v4l2_ctrl *gr_off_ctrl;
+ struct v4l2_ctrl *gb_off_ctrl;
+ };
};
#define GAMMA_MAX 2
diff --git a/include/linux/atmel-isc-media.h b/include/linux/atmel-isc-media.h
new file mode 100644
index 0000000..02ccf86
--- /dev/null
+++ b/include/linux/atmel-isc-media.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2019 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
+ */
+
+#ifndef __LINUX_ATMEL_ISC_MEDIA_H__
+#define __LINUX_ATMEL_ISC_MEDIA_H__
+
+/*
+ * There are 8 controls available:
+ * 4 gain controls , sliders, for each of the BAYER components: R, B, GR, GB.
+ * These gains are multipliers for each component, in format unsigned 0:4:9 with
+ * a default value of 512 (1.0 multiplier).
+ * 4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.
+ * These offsets are added/substracted from each component, in format signed
+ * 1:12:0 with a default value of 0 (+/- 0)
+ *
+ * To expose this to userspace, added 8 custom controls, in an auto cluster.
+ *
+ * To summarize the functionality:
+ * The auto cluster switch is the auto white balance control, and it works
+ * like this:
+ * AWB ==1 : autowhitebalance is on, the do_white_balance button is inactive,
+ * the gains/offsets are inactive, but volatile and readable.
+ * Thus, the results of the whitebalance algorithm are available to userspace to
+ * read at any time.
+ * AWB ==0: autowhitebalance is off, cluster is in manual mode, user can
+ * configure the gain/offsets directly.
+ * More than that, if the do_white_balance button is
+ * pressed, the driver will perform one-time-adjustment, (preferably with color
+ * checker card) and the userspace can read again the new values.
+ *
+ * With this feature, the userspace can save the coefficients and reinstall them
+ * for example after reboot or reprobing the driver.
+ */
+
+enum atmel_isc_ctrl_id {
+ /* Red component gain control */
+ ISC_CID_R_GAIN = (V4L2_CID_USER_ATMEL_ISC_BASE + 0),
+ /* Blue component gain control */
+ ISC_CID_B_GAIN,
+ /* Green Red component gain control */
+ ISC_CID_GR_GAIN,
+ /* Green Blue gain control */
+ ISC_CID_GB_GAIN,
+ /* Red component offset control */
+ ISC_CID_R_OFFSET,
+ /* Blue component offset control */
+ ISC_CID_B_OFFSET,
+ /* Green Red component offset control */
+ ISC_CID_GR_OFFSET,
+ /* Green Blue component offset control */
+ ISC_CID_GB_OFFSET,
+};
+
+#endif
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 5a7bede..95e0291 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -192,6 +192,10 @@ enum v4l2_colorfx {
* We reserve 16 controls for this driver. */
#define V4L2_CID_USER_IMX_BASE (V4L2_CID_USER_BASE + 0x10b0)
+/* The base for the atmel isc driver controls.
+ * We reserve 32 controls for this driver. */
+#define V4L2_CID_USER_ATMEL_ISC_BASE (V4L2_CID_USER_BASE + 0x10c0)
+
/* MPEG-class control IDs */
/* The MPEG controls are applicable to all codec controls
* and the 'MPEG' part of the define is historical */
--
2.7.4