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authorThierry Reding <treding@nvidia.com>2013-08-30 11:51:22 +0200
committerThierry Reding <thierry.reding@gmail.com>2013-10-16 09:05:57 +0200
commit2b9b1620349e325f184c68cddf3b484499c163c0 (patch)
treec995537dbc064a0383db2c8a53d4949cff3d6f12
parent97c38437115aa0c3fb2d50c488814b503ba529e0 (diff)
pwm-backlight: Add optional enable GPIO
To support a wider variety of backlight setups, introduce an optional enable GPIO. Legacy users of the platform data already have a means of supporting GPIOs by using the .init(), .exit() and .notify() hooks. DT users however cannot use those, so an alternative method is required. In order to ease the introduction of the optional enable GPIO, make it available in the platform data first, so that existing users can be converted. Once that has happened a second patch will add code to make use of it in the driver. Signed-off-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--include/linux/pwm_backlight.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index 56f4a866539a..2de2e275b2cb 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h
@@ -6,6 +6,9 @@
#include <linux/backlight.h>
+/* TODO: convert to gpiod_*() API once it has been merged */
+#define PWM_BACKLIGHT_GPIO_ACTIVE_LOW (1 << 0)
+
struct platform_pwm_backlight_data {
int pwm_id;
unsigned int max_brightness;
@@ -13,6 +16,8 @@ struct platform_pwm_backlight_data {
unsigned int lth_brightness;
unsigned int pwm_period_ns;
unsigned int *levels;
+ int enable_gpio;
+ unsigned long enable_gpio_flags;
int (*init)(struct device *dev);
int (*notify)(struct device *dev, int brightness);
void (*notify_after)(struct device *dev, int brightness);