backlight: Allow properties to be passed at registration

Values such as max_brightness should be set before backlights are
registered, but the current API doesn't allow that. Add a parameter to
backlight_device_register and update drivers to ensure that they
set this correctly.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
index f625ffc69ad3..2d9760551a4b 100644
--- a/drivers/video/backlight/atmel-pwm-bl.c
+++ b/drivers/video/backlight/atmel-pwm-bl.c
@@ -120,6 +120,7 @@ static const struct backlight_ops atmel_pwm_bl_ops = {
 
 static int atmel_pwm_bl_probe(struct platform_device *pdev)
 {
+        struct backlight_properties props;
         const struct atmel_pwm_bl_platform_data *pdata;
         struct backlight_device *bldev;
         struct atmel_pwm_bl *pwmbl;
@@ -165,8 +166,10 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
                         goto err_free_gpio;
         }
 
-        bldev = backlight_device_register("atmel-pwm-bl",
-                        &pdev->dev, pwmbl, &atmel_pwm_bl_ops);
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = pdata->pwm_duty_max - pdata->pwm_duty_min;
+        bldev = backlight_device_register("atmel-pwm-bl", &pdev->dev, pwmbl,
+                                          &atmel_pwm_bl_ops, &props);
         if (IS_ERR(bldev)) {
                 retval = PTR_ERR(bldev);
                 goto err_free_gpio;
@@ -178,7 +181,6 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 
         /* Power up the backlight by default at middle intesity. */
         bldev->props.power = FB_BLANK_UNBLANK;
-        bldev->props.max_brightness = pdata->pwm_duty_max - pdata->pwm_duty_min;
         bldev->props.brightness = bldev->props.max_brightness / 2;
 
         retval = atmel_pwm_bl_init_pwm(pwmbl);