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backlight: gpio: Pull gpio_backlight_initial_power_state() into probe 

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>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2019-10-22 10:36:30 +02:00 committed by Lee Jones
parent d17465a0af
commit 9afa302473
1 changed files with 14 additions and 24 deletions
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38
drivers/video/backlight/gpio_backlight.c
View File

@ -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_get_next_brightness(struct backlight_device *bl)
@ -60,41 +57,24 @@ 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_direction(gbl->gpiod) == 0 &&
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, init_brightness;
int ret, init_brightness, 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)) {
@ -115,7 +95,17 @@ 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_direction(gbl->gpiod) == 0 &&
gpiod_get_value_cansleep(gbl->gpiod) == 0)
bl->props.power = FB_BLANK_POWERDOWN;
else
bl->props.power = FB_BLANK_UNBLANK;
bl->props.brightness = 1;
init_brightness = gpio_backlight_get_next_brightness(bl);