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94 lines
2.8 KiB
Diff
94 lines
2.8 KiB
Diff
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From e14032e74f63afc123d631d4475b057221b2de60 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 11 Jun 2020 18:19:13 +0100
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Subject: [PATCH] media: i2c: imx290: Add exposure control to the
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driver.
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Adds support for V4L2_CID_EXPOSURE so that userspace can control
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the sensor exposure time.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/imx290.c | 35 +++++++++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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--- a/drivers/media/i2c/imx290.c
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+++ b/drivers/media/i2c/imx290.c
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@@ -45,6 +45,10 @@ enum imx290_clk_index {
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#define IMX290_HMAX_MIN_2LANE 4400 /* Min of 4400 pixels = 30fps */
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#define IMX290_HMAX_MIN_4LANE 2200 /* Min of 2200 pixels = 60fps */
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#define IMX290_HMAX_MAX 0xffff
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+
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+#define IMX290_EXPOSURE_MIN 2
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+#define IMX290_EXPOSURE_STEP 1
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+#define IMX290_EXPOSURE_LOW 0x3020
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#define IMX290_PGCTRL 0x308c
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#define IMX290_PHY_LANE_NUM 0x3407
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#define IMX290_CSI_LANE_MODE 0x3443
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@@ -103,6 +107,7 @@ struct imx290 {
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struct v4l2_ctrl *pixel_rate;
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struct v4l2_ctrl *hblank;
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struct v4l2_ctrl *vblank;
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+ struct v4l2_ctrl *exposure;
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struct mutex lock;
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};
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@@ -529,6 +534,20 @@ static int imx290_set_gain(struct imx290
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return ret;
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}
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+static int imx290_set_exposure(struct imx290 *imx290, u32 value)
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+{
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+ u32 exposure = (imx290->current_mode->height + imx290->vblank->val) -
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+ value;
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+ int ret;
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+
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+ ret = imx290_write_buffered_reg(imx290, IMX290_EXPOSURE_LOW, 3,
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+ exposure);
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+ if (ret)
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+ dev_err(imx290->dev, "Unable to write exposure\n");
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+
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+ return ret;
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+}
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+
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static int imx290_set_hmax(struct imx290 *imx290, u32 val)
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{
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u32 hmax = val + imx290->current_mode->width;
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@@ -590,6 +609,9 @@ static int imx290_set_ctrl(struct v4l2_c
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case V4L2_CID_GAIN:
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ret = imx290_set_gain(imx290, ctrl->val);
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break;
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+ case V4L2_CID_EXPOSURE:
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+ ret = imx290_set_exposure(imx290, ctrl->val);
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+ break;
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case V4L2_CID_HBLANK:
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ret = imx290_set_hmax(imx290, ctrl->val);
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break;
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@@ -764,6 +786,12 @@ static int imx290_set_fmt(struct v4l2_su
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IMX290_VMAX_MAX - mode->height,
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1,
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mode->vmax - mode->height);
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+ if (imx290->exposure)
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+ __v4l2_ctrl_modify_range(imx290->exposure,
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+ mode->vmax - mode->height,
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+ mode->vmax - 4,
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+ IMX290_EXPOSURE_STEP,
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+ mode->vmax - 4);
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}
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*format = fmt->format;
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@@ -1178,6 +1206,13 @@ static int imx290_probe(struct i2c_clien
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IMX290_VMAX_MAX - mode->height, 1,
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mode->vmax - mode->height);
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+ imx290->exposure = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
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+ V4L2_CID_EXPOSURE,
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+ IMX290_EXPOSURE_MIN,
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+ mode->vmax - 4,
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+ IMX290_EXPOSURE_STEP,
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+ mode->vmax - 4);
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+
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imx290->link_freq =
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v4l2_ctrl_new_int_menu(&imx290->ctrls, &imx290_ctrl_ops,
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V4L2_CID_LINK_FREQ,
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