Sorry, but I mistakenly sent the wrong patch.
Please take a look at the v2 patch instead: [PATCH v2] leds: lm3601x:
Calculate max_brightness and brightness properly.
I apologize for the error and any confusion it may have caused.
On Thu, Jul 4, 2024 at 3:02 PM Jack Chen <zenghuchen@xxxxxxxxxx> wrote:
>
> The torch_current_max should be checked not exceeding the upper bound.
> If it does, throw a warning message and set to LM3601X_MAX_TORCH_I_UA.
>
> LM3601x torch brigthness register (LM3601X_LED_TORCH_REG) takes 0 as the
> minimum output (2.4 mA). However, 0 of led_brightness means LED_OFF.
> Adding a -1 offset to brightness before writing to brightness
> register, so when users write minimum brightness (1), it sets lm3601x
> output the minimum.
>
> Signed-off-by: Jack Chen <zenghuchen@xxxxxxxxxx>
> ---
> drivers/leds/flash/leds-lm3601x.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/leds/flash/leds-lm3601x.c b/drivers/leds/flash/leds-lm3601x.c
> index 7e93c447fec5..fc4df904ea90 100644
> --- a/drivers/leds/flash/leds-lm3601x.c
> +++ b/drivers/leds/flash/leds-lm3601x.c
> @@ -190,7 +190,7 @@ static int lm3601x_brightness_set(struct led_classdev *cdev,
> goto out;
> }
>
> - ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness);
> + ret = regmap_write(led->regmap, LM3601X_LED_TORCH_REG, brightness - 1);
> if (ret < 0)
> goto out;
>
> @@ -341,8 +341,9 @@ static int lm3601x_register_leds(struct lm3601x_led *led,
>
> led_cdev = &led->fled_cdev.led_cdev;
> led_cdev->brightness_set_blocking = lm3601x_brightness_set;
> - led_cdev->max_brightness = DIV_ROUND_UP(led->torch_current_max,
> - LM3601X_TORCH_REG_DIV);
> + led_cdev->max_brightness = DIV_ROUND_UP(
> + led->torch_current_max - LM3601X_MIN_TORCH_I_UA + 1,
> + LM3601X_TORCH_REG_DIV);
> led_cdev->flags |= LED_DEV_CAP_FLASH;
>
> init_data.fwnode = fwnode;
> @@ -386,6 +387,14 @@ static int lm3601x_parse_node(struct lm3601x_led *led,
> goto out_err;
> }
>
> + if (led->torch_current_max > LM3601X_MAX_TORCH_I_UA) {
> + dev_warn(&led->client->dev,
> + "led-max-microamp cannot be higher than %d\n",
> + LM3601X_MAX_TORCH_I_UA);
> + led->torch_current_max = LM3601X_MAX_TORCH_I_UA;
> + }
> +
> +
> ret = fwnode_property_read_u32(child, "flash-max-microamp",
> &led->flash_current_max);
> if (ret) {
> --
> 2.45.2.803.g4e1b14247a-goog
>
