linux-kernel - Re: [PATCH 2/3] media: i2c: ov9282: add led

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Message-ID: <CAPY8ntAQnN+Ea4oMKK5RkCa+EZMwbCjX4uJx2ex5E=peuz0vAA@mail.gmail.com>
Date: Tue, 4 Mar 2025 17:27:34 +0000
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Richard Leitner <richard.leitner@...ux.dev>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] media: i2c: ov9282: add led_mode v4l2 control

Hi Richard

On Mon, 3 Mar 2025 at 22:59, Richard Leitner <richard.leitner@...ux.dev> wrote:
>
> Add V4L2_CID_FLASH_LED_MODE support using the "strobe output enable"
> feature of the sensor. This implements following modes:
>
>  - V4L2_FLASH_LED_MODE_NONE, which disables the strobe output
>  - V4L2_FLASH_LED_MODE_FLASH, which enables the strobe output
>
> All values are based on the OV9281 datasheet v1.53 (january 2019) and
> tested using an ov9281 VisionComponents module.
>
> Signed-off-by: Richard Leitner <richard.leitner@...ux.dev>
> ---
>  drivers/media/i2c/ov9282.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
> index f42e0d439753e74d14e3a3592029e48f49234927..c98ba466e9aea29baff0b13578d760bf69c958c5 100644
> --- a/drivers/media/i2c/ov9282.c
> +++ b/drivers/media/i2c/ov9282.c
> @@ -192,6 +192,7 @@ struct ov9282_mode {
>   * @exp_ctrl: Pointer to exposure control
>   * @again_ctrl: Pointer to analog gain control
>   * @pixel_rate: Pointer to pixel rate control
> + * @flash_led_mode: Pointer to flash led mode control
>   * @vblank: Vertical blanking in lines
>   * @noncontinuous_clock: Selection of CSI2 noncontinuous clock mode
>   * @cur_mode: Pointer to current selected sensor mode
> @@ -214,6 +215,7 @@ struct ov9282 {
>                 struct v4l2_ctrl *again_ctrl;
>         };
>         struct v4l2_ctrl *pixel_rate;
> +       struct v4l2_ctrl *flash_led_mode;

As with 3/3, you only use this control from within ov9282_set_ctrl
where you are given the struct v4l2_ctrl, so there is no need to store
it in the device state structure.

>         u32 vblank;
>         bool noncontinuous_clock;
>         const struct ov9282_mode *cur_mode;
> @@ -670,6 +672,23 @@ static int ov9282_set_ctrl_vflip(struct ov9282 *ov9282, int value)
>                                 current_val);
>  }
>
> +static int ov9282_set_ctrl_flash_led_mode(struct ov9282 *ov9282, int mode)
> +{
> +       u32 current_val;
> +       int ret = ov9282_read_reg(ov9282, OV9282_REG_OUTPUT_ENABLE6, 1,
> +                                 &current_val);
> +       if (ret)
> +               return ret;
> +
> +       if (mode == V4L2_FLASH_LED_MODE_FLASH)
> +               current_val |= OV9282_OUTPUT_ENABLE6_STROBE;
> +       else
> +               current_val &= ~OV9282_OUTPUT_ENABLE6_STROBE;
> +
> +       return ov9282_write_reg(ov9282, OV9282_REG_OUTPUT_ENABLE6, 1,
> +                               current_val);
> +}
> +
>  /**
>   * ov9282_set_ctrl() - Set subdevice control
>   * @ctrl: pointer to v4l2_ctrl structure
> @@ -736,6 +755,9 @@ static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
>                 ret = ov9282_write_reg(ov9282, OV9282_REG_TIMING_HTS, 2,
>                                        (ctrl->val + ov9282->cur_mode->width) >> 1);
>                 break;
> +       case V4L2_CID_FLASH_LED_MODE:
> +               ret = ov9282_set_ctrl_flash_led_mode(ov9282, ctrl->val);
> +               break;
>         default:
>                 dev_err(ov9282->dev, "Invalid control %d", ctrl->id);
>                 ret = -EINVAL;
> @@ -1391,6 +1413,13 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
>                                                 OV9282_TIMING_HTS_MAX - mode->width,
>                                                 1, hblank_min);
>
> +       /* Flash/Strobe controls */
> +       ov9282->flash_led_mode = v4l2_ctrl_new_std_menu(ctrl_hdlr, &ov9282_ctrl_ops,
> +                                                       V4L2_CID_FLASH_LED_MODE,
> +                                                       V4L2_FLASH_LED_MODE_TORCH,
> +                                                       (1 << V4L2_FLASH_LED_MODE_TORCH),
> +                                                       V4L2_FLASH_LED_MODE_NONE);
> +
>         ret = v4l2_fwnode_device_parse(ov9282->dev, &props);
>         if (!ret) {
>                 /* Failure sets ctrl_hdlr->error, which we check afterwards anyway */
>
> --
> 2.47.2
>
>