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: Thierry Reding <treding@nvidia.com>
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Родитель
62b744a87c
Коммит
97c3843711
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@ -27,6 +27,7 @@ struct pwm_bl_data {
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unsigned int period;
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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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int (*notify)(struct device *,
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int brightness);
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void (*notify_after)(struct device *,
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@ -40,6 +41,9 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness,
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{
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int duty_cycle, err;
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if (pb->enabled)
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return;
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if (pb->levels) {
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duty_cycle = pb->levels[brightness];
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max = pb->levels[max];
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@ -52,12 +56,18 @@ 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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pwm_enable(pb->pwm);
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pb->enabled = true;
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}
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static void pwm_backlight_power_off(struct pwm_bl_data *pb)
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{
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if (!pb->enabled)
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return;
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pwm_config(pb->pwm, 0, pb->period);
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pwm_disable(pb->pwm);
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pb->enabled = false;
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}
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static int pwm_backlight_update_status(struct backlight_device *bl)
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@ -216,6 +226,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
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pb->check_fb = data->check_fb;
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pb->exit = data->exit;
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pb->dev = &pdev->dev;
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pb->enabled = false;
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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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