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Commit 97c38437 authored by Thierry Reding's avatar Thierry Reding Committed by Thierry Reding
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pwm-backlight: Track enable state 



Follow up patches will add support for more complex means of powering
the backlight on and off such as using a regulator. To prevent calls to
the regulator API from becoming unbalanced, keep track of the enabled
state internally.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 62b744a8

drivers/video/backlight/pwm_bl.c

+11 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ struct pwm_bl_data { 
	unsigned int		period;

	unsigned int		lth_brightness;

	unsigned int		*levels;

	bool			enabled;

	int			(*notify)(struct device *,

					  int brightness);

	void			(*notify_after)(struct device *,
@@ -40,6 +41,9 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, 
{

	int duty_cycle, err;



	if (pb->enabled)

		return;



	if (pb->levels) {

		duty_cycle = pb->levels[brightness];

		max = pb->levels[max];
@@ -52,12 +56,18 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, 


	pwm_config(pb->pwm, duty_cycle, pb->period);

	pwm_enable(pb->pwm);

	pb->enabled = true;

}



static void pwm_backlight_power_off(struct pwm_bl_data *pb)

{

	if (!pb->enabled)

		return;



	pwm_config(pb->pwm, 0, pb->period);

	pwm_disable(pb->pwm);



	pb->enabled = false;

}



static int pwm_backlight_update_status(struct backlight_device *bl)
@@ -216,6 +226,7 @@ static int pwm_backlight_probe(struct platform_device *pdev) 
	pb->check_fb = data->check_fb;

	pb->exit = data->exit;

	pb->dev = &pdev->dev;

	pb->enabled = false;



	pb->pwm = devm_pwm_get(&pdev->dev, NULL);

	if (IS_ERR(pb->pwm)) {