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SubjectRe: [PATCH v5 7/7] backlight: gpio: pull gpio_backlight_initial_power_state() into probe
On Mon, Oct 07, 2019 at 05:32:00AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> The probe function in the gpio-backlight driver is quite short. If we
> pull gpio_backlight_initial_power_state() into probe we can drop two
> more fields from struct gpio_backlight and shrink the driver code.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>

> ---
> drivers/video/backlight/gpio_backlight.c | 37 +++++++++---------------
> 1 file changed, 13 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index 6247687b6330..407d4eaafc5c 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -17,11 +17,8 @@
> #include <linux/slab.h>
>
> struct gpio_backlight {
> - struct device *dev;
> struct device *fbdev;
> -
> struct gpio_desc *gpiod;
> - int def_value;
> };
>
> static int gpio_backlight_update_status(struct backlight_device *bl)
> @@ -53,41 +50,24 @@ static const struct backlight_ops gpio_backlight_ops = {
> .check_fb = gpio_backlight_check_fb,
> };
>
> -static int gpio_backlight_initial_power_state(struct gpio_backlight *gbl)
> -{
> - struct device_node *node = gbl->dev->of_node;
> -
> - /* Not booted with device tree or no phandle link to the node */
> - if (!node || !node->phandle)
> - return gbl->def_value ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
> -
> - /* if the enable GPIO is disabled, do not enable the backlight */
> - if (gpiod_get_value_cansleep(gbl->gpiod) == 0)
> - return FB_BLANK_POWERDOWN;
> -
> - return FB_BLANK_UNBLANK;
> -}
> -
> -
> static int gpio_backlight_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct gpio_backlight_platform_data *pdata = dev_get_platdata(dev);
> + struct device_node *of_node = dev->of_node;
> struct backlight_properties props;
> struct backlight_device *bl;
> struct gpio_backlight *gbl;
> - int ret;
> + int ret, def_value;
>
> gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL);
> if (gbl == NULL)
> return -ENOMEM;
>
> - gbl->dev = dev;
> -
> if (pdata)
> gbl->fbdev = pdata->fbdev;
>
> - gbl->def_value = device_property_read_bool(dev, "default-on");
> + def_value = device_property_read_bool(dev, "default-on");
>
> gbl->gpiod = devm_gpiod_get(dev, NULL, GPIOD_ASIS);
> if (IS_ERR(gbl->gpiod)) {
> @@ -109,7 +89,16 @@ static int gpio_backlight_probe(struct platform_device *pdev)
> return PTR_ERR(bl);
> }
>
> - bl->props.power = gpio_backlight_initial_power_state(gbl);
> + /* Set the initial power 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_value_cansleep(gbl->gpiod) == 0)
> + bl->props.power = FB_BLANK_POWERDOWN;
> + else
> + bl->props.power = FB_BLANK_UNBLANK;
> +
> bl->props.brightness = 1;
>
> backlight_update_status(bl);
> --
> 2.23.0
>

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