mirror of https://gitee.com/openkylin/linux.git
pwm-backlight: Add power supply support
Backlights require a power supply to work properly. This commit adds a regulator to power up and power down the backlight. Signed-off-by: Thierry Reding <treding@nvidia.com>
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@ -10,6 +10,7 @@ Required properties:
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last value in the array represents a 100% duty cycle (brightest).
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- default-brightness-level: the default brightness level (index into the
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array defined by the "brightness-levels" property)
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- power-supply: regulator for supply voltage
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Optional properties:
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- pwm-names: a list of names for the PWM devices specified in the
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@ -29,5 +30,6 @@ Example:
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brightness-levels = <0 4 8 16 32 64 128 255>;
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default-brightness-level = <6>;
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power-supply = <&vdd_bl_reg>;
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enable-gpios = <&gpio 58 0>;
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};
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@ -21,6 +21,7 @@
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#include <linux/err.h>
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#include <linux/pwm.h>
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#include <linux/pwm_backlight.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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struct pwm_bl_data {
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@ -30,6 +31,7 @@ struct pwm_bl_data {
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unsigned int lth_brightness;
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unsigned int *levels;
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bool enabled;
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struct regulator *power_supply;
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int enable_gpio;
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unsigned long enable_gpio_flags;
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int (*notify)(struct device *,
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@ -60,6 +62,10 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness,
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pwm_config(pb->pwm, duty_cycle, pb->period);
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err = regulator_enable(pb->power_supply);
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if (err < 0)
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dev_err(pb->dev, "failed to enable power supply\n");
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if (gpio_is_valid(pb->enable_gpio)) {
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if (pb->enable_gpio_flags & PWM_BACKLIGHT_GPIO_ACTIVE_LOW)
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gpio_set_value(pb->enable_gpio, 0);
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@ -86,6 +92,7 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)
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gpio_set_value(pb->enable_gpio, 0);
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}
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regulator_disable(pb->power_supply);
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pb->enabled = false;
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}
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@ -268,6 +275,12 @@ static int pwm_backlight_probe(struct platform_device *pdev)
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}
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}
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pb->power_supply = devm_regulator_get(&pdev->dev, "power");
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if (IS_ERR(pb->power_supply)) {
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ret = PTR_ERR(pb->power_supply);
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goto err_gpio;
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}
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pb->pwm = devm_pwm_get(&pdev->dev, NULL);
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if (IS_ERR(pb->pwm)) {
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dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
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