On Sun, Aug 23, 2020 at 12:45:12PM +0200, Sam Ravnborg wrote:
> Use backlight_{enable,disable} in the probe function to
> avoid hardcoding power handling in the driver.
>
> Move platform_set_drvdata() up as the enable/disable call
> will trigger a callback to the driver.
>
> Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Cc: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
> Cc: Jingoo Han <jingoohan1@xxxxxxxxx>
Reviewed-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
> ---
> drivers/video/backlight/gpio_backlight.c | 24 +++++++++++++++---------
> 1 file changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index 6f78d928f054..dc9354dc5e6a 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -53,6 +53,7 @@ static int gpio_backlight_probe(struct platform_device *pdev)
> struct backlight_device *bl;
> struct gpio_backlight *gbl;
> int ret, init_brightness, def_value;
> + bool enable = false;
>
> gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL);
> if (gbl == NULL)
> @@ -82,16 +83,22 @@ static int gpio_backlight_probe(struct platform_device *pdev)
> return PTR_ERR(bl);
> }
>
> - /* Set the initial power state */
> - if (!of_node || !of_node->phandle)
> + platform_set_drvdata(pdev, bl);
> +
> + /* Set the initial state */
> + if (!of_node || !of_node->phandle) {
> /* Not booted with device tree or no phandle link to the node */
> - bl->props.power = def_value ? FB_BLANK_UNBLANK
> - : FB_BLANK_POWERDOWN;
> - else if (gpiod_get_direction(gbl->gpiod) == 0 &&
> - gpiod_get_value_cansleep(gbl->gpiod) == 0)
> - bl->props.power = FB_BLANK_POWERDOWN;
> + if (def_value)
> + enable = true;
> + } else if (!(gpiod_get_direction(gbl->gpiod) == 0 &&
> + gpiod_get_value_cansleep(gbl->gpiod) == 0)) {
> + enable = true;
> + }
> +
> + if (enable)
> + backlight_enable(bl);
> else
> - bl->props.power = FB_BLANK_UNBLANK;
> + backlight_disable(bl);
>
> bl->props.brightness = 1;
>
> @@ -102,7 +109,6 @@ static int gpio_backlight_probe(struct platform_device *pdev)
> return ret;
> }
>
> - platform_set_drvdata(pdev, bl);
> return 0;
> }
>
> --
> 2.25.1
>
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