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media: ov5647: Support gain, exposure and AWB controls

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Add controls to support AWB, AEC and AGC. Also add control support to
set exposure (in lines) and analogue gain (as a register code).

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
David Plowman
2020-11-19 17:32:31 +01:00
committed by Mauro Carvalho Chehab
parent ab614f2756
commit 4974c2f19f
1 changed files with 170 additions and 2 deletions
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172
drivers/media/i2c/ov5647.c
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@@ -21,6 +21,7 @@
#include <linux/of_graph.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-image-sizes.h>
@@ -43,9 +44,16 @@
#define OV5647_REG_CHIPID_H 0x300a
#define OV5647_REG_CHIPID_L 0x300b
#define OV5640_REG_PAD_OUT 0x300d
#define OV5647_REG_EXP_HI 0x3500
#define OV5647_REG_EXP_MID 0x3501
#define OV5647_REG_EXP_LO 0x3502
#define OV5647_REG_AEC_AGC 0x3503
#define OV5647_REG_GAIN_HI 0x350a
#define OV5647_REG_GAIN_LO 0x350b
#define OV5647_REG_FRAME_OFF_NUMBER 0x4202
#define OV5647_REG_MIPI_CTRL00 0x4800
#define OV5647_REG_MIPI_CTRL14 0x4814
#define OV5647_REG_AWB 0x5001
#define REG_TERM 0xfffe
#define VAL_TERM 0xfe
@@ -87,6 +95,7 @@ struct ov5647 {
struct clk *xclk;
struct gpio_desc *pwdn;
bool clock_ncont;
struct v4l2_ctrl_handler ctrls;
};
static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
@@ -121,7 +130,6 @@ static struct regval_list ov5647_640x480[] = {
{0x3612, 0x59},
{0x3618, 0x00},
{0x5000, 0x06},
{0x5001, 0x01},
{0x5002, 0x41},
{0x5003, 0x08},
{0x5a00, 0x08},
@@ -313,6 +321,11 @@ static int ov5647_stream_on(struct v4l2_subdev *sd)
return ret;
}
/* Apply customized values from user when stream starts. */
ret = __v4l2_ctrl_handler_setup(sd->ctrl_handler);
if (ret)
return ret;
if (ov5647->clock_ncont)
val |= MIPI_CTRL00_CLOCK_LANE_GATE |
MIPI_CTRL00_LINE_SYNC_ENABLE;
@@ -594,6 +607,154 @@ static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
.open = ov5647_open,
};
static int ov5647_s_auto_white_balance(struct v4l2_subdev *sd, u32 val)
{
return ov5647_write(sd, OV5647_REG_AWB, val ? 1 : 0);
}
static int ov5647_s_autogain(struct v4l2_subdev *sd, u32 val)
{
int ret;
u8 reg;
/* Non-zero turns on AGC by clearing bit 1.*/
ret = ov5647_read(sd, OV5647_REG_AEC_AGC, &reg);
if (ret)
return ret;
return ov5647_write(sd, OV5647_REG_AEC_AGC, val ? reg & ~BIT(1)
: reg | BIT(1));
}
static int ov5647_s_exposure_auto(struct v4l2_subdev *sd, u32 val)
{
int ret;
u8 reg;
/*
* Everything except V4L2_EXPOSURE_MANUAL turns on AEC by
* clearing bit 0.
*/
ret = ov5647_read(sd, OV5647_REG_AEC_AGC, &reg);
if (ret)
return ret;
return ov5647_write(sd, OV5647_REG_AEC_AGC,
val == V4L2_EXPOSURE_MANUAL ? reg | BIT(0)
: reg & ~BIT(0));
}
static int ov5647_s_analogue_gain(struct v4l2_subdev *sd, u32 val)
{
int ret;
/* 10 bits of gain, 2 in the high register. */
ret = ov5647_write(sd, OV5647_REG_GAIN_HI, (val >> 8) & 3);
if (ret)
return ret;
return ov5647_write(sd, OV5647_REG_GAIN_LO, val & 0xff);
}
static int ov5647_s_exposure(struct v4l2_subdev *sd, u32 val)
{
int ret;
/*
* Sensor has 20 bits, but the bottom 4 bits are fractions of a line
* which we leave as zero (and don't receive in "val").
*/
ret = ov5647_write(sd, OV5647_REG_EXP_HI, (val >> 12) & 0xf);
if (ret)
return ret;
ret = ov5647_write(sd, OV5647_REG_EXP_MID, (val >> 4) & 0xff);
if (ret)
return ret;
return ov5647_write(sd, OV5647_REG_EXP_LO, (val & 0xf) << 4);
}
static int ov5647_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct ov5647 *sensor = container_of(ctrl->handler,
struct ov5647, ctrls);
struct v4l2_subdev *sd = &sensor->sd;
struct i2c_client *client = v4l2_get_subdevdata(sd);
/* v4l2_ctrl_lock() locks our own mutex */
/*
* If the device is not powered up by the host driver do
* not apply any controls to H/W at this time. Instead
* the controls will be restored at s_stream(1) time.
*/
if (!sensor->power_count)
return 0;
switch (ctrl->id) {
case V4L2_CID_AUTO_WHITE_BALANCE:
return ov5647_s_auto_white_balance(sd, ctrl->val);
case V4L2_CID_AUTOGAIN:
return ov5647_s_autogain(sd, ctrl->val);
case V4L2_CID_EXPOSURE_AUTO:
return ov5647_s_exposure_auto(sd, ctrl->val);
case V4L2_CID_ANALOGUE_GAIN:
return ov5647_s_analogue_gain(sd, ctrl->val);
case V4L2_CID_EXPOSURE:
return ov5647_s_exposure(sd, ctrl->val);
default:
dev_info(&client->dev,
"Control (id:0x%x, val:0x%x) not supported\n",
ctrl->id, ctrl->val);
return -EINVAL;
}
return 0;
}
static const struct v4l2_ctrl_ops ov5647_ctrl_ops = {
.s_ctrl = ov5647_s_ctrl,
};
static int ov5647_init_controls(struct ov5647 *sensor)
{
struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
v4l2_ctrl_handler_init(&sensor->ctrls, 5);
v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 0);
v4l2_ctrl_new_std_menu(&sensor->ctrls, &ov5647_ctrl_ops,
V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL,
0, V4L2_EXPOSURE_MANUAL);
/* min: 4 lines; max: 0xffff lines; default: 1000 lines. */
v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
V4L2_CID_EXPOSURE, 4, 65535, 1, 1000);
/* min: 16 = 1.0x; max (10 bits); default: 32 = 2.0x. */
v4l2_ctrl_new_std(&sensor->ctrls, &ov5647_ctrl_ops,
V4L2_CID_ANALOGUE_GAIN, 16, 1023, 1, 32);
if (sensor->ctrls.error) {
dev_err(&client->dev,
"%s Controls initialization failed (%d)\n",
__func__, sensor->ctrls.error);
v4l2_ctrl_handler_free(&sensor->ctrls);
return sensor->ctrls.error;
}
sensor->sd.ctrl_handler = &sensor->ctrls;
return 0;
}
static int ov5647_parse_dt(struct ov5647 *sensor, struct device_node *np)
{
struct v4l2_fwnode_endpoint bus_cfg = {
@@ -661,6 +822,10 @@ static int ov5647_probe(struct i2c_client *client)
mutex_init(&sensor->lock);
ret = ov5647_init_controls(sensor);
if (ret)
goto mutex_destroy;
sd = &sensor->sd;
v4l2_i2c_subdev_init(sd, client, &ov5647_subdev_ops);
sd->internal_ops = &ov5647_subdev_internal_ops;
@@ -670,7 +835,7 @@ static int ov5647_probe(struct i2c_client *client)
sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
if (ret < 0)
goto mutex_destroy;
goto ctrl_handler_free;
if (sensor->pwdn) {
gpiod_set_value_cansleep(sensor->pwdn, 0);
@@ -692,6 +857,8 @@ static int ov5647_probe(struct i2c_client *client)
entity_cleanup:
media_entity_cleanup(&sd->entity);
ctrl_handler_free:
v4l2_ctrl_handler_free(&sensor->ctrls);
mutex_destroy:
mutex_destroy(&sensor->lock);
@@ -705,6 +872,7 @@ static int ov5647_remove(struct i2c_client *client)
v4l2_async_unregister_subdev(&ov5647->sd);
media_entity_cleanup(&ov5647->sd.entity);
v4l2_ctrl_handler_free(&ov5647->ctrls);
v4l2_device_unregister_subdev(sd);
mutex_destroy(&ov5647->lock);