[PATCH v5 7/7] backlight: gpio: pull gpio_backlight_initial_power_state() into probe

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszew...@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 <bgolaszew...@baylibre.com>
---
 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