46 static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness)  in pwm_backlight_power_on()  argument
50 	if (pb->enabled)  in pwm_backlight_power_on()
53 	err = regulator_enable(pb->power_supply);  in pwm_backlight_power_on()
55 		dev_err(pb->dev, "failed to enable power supply\n");  in pwm_backlight_power_on()
57 	if (pb->enable_gpio)  in pwm_backlight_power_on()
58 		gpiod_set_value(pb->enable_gpio, 1);  in pwm_backlight_power_on()
60 	pwm_enable(pb->pwm);  in pwm_backlight_power_on()
61 	pb->enabled = true;  in pwm_backlight_power_on()
64 static void pwm_backlight_power_off(struct pwm_bl_data *pb)  in pwm_backlight_power_off()  argument
66 	if (!pb->enabled)  in pwm_backlight_power_off()
69 	pwm_config(pb->pwm, 0, pb->period);  in pwm_backlight_power_off()
70 	pwm_disable(pb->pwm);  in pwm_backlight_power_off()
72 	if (pb->enable_gpio)  in pwm_backlight_power_off()
73 		gpiod_set_value(pb->enable_gpio, 0);  in pwm_backlight_power_off()
75 	regulator_disable(pb->power_supply);  in pwm_backlight_power_off()
76 	pb->enabled = false;  in pwm_backlight_power_off()
79 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)  in compute_duty_cycle()  argument
81 	unsigned int lth = pb->lth_brightness;  in compute_duty_cycle()
84 	if (pb->levels)  in compute_duty_cycle()
85 		duty_cycle = pb->levels[brightness];  in compute_duty_cycle()
89 	return (duty_cycle * (pb->period - lth) / pb->scale) + lth;  in compute_duty_cycle()
94 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_update_status()  local
103 	if (pb->notify)  in pwm_backlight_update_status()
104 		brightness = pb->notify(pb->dev, brightness);  in pwm_backlight_update_status()
107 		duty_cycle = compute_duty_cycle(pb, brightness);  in pwm_backlight_update_status()
108 		pwm_config(pb->pwm, duty_cycle, pb->period);  in pwm_backlight_update_status()
109 		pwm_backlight_power_on(pb, brightness);  in pwm_backlight_update_status()
111 		pwm_backlight_power_off(pb);  in pwm_backlight_update_status()
113 	if (pb->notify_after)  in pwm_backlight_update_status()
114 		pb->notify_after(pb->dev, brightness);  in pwm_backlight_update_status()
122 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_check_fb()  local
124 	return !pb->check_fb || pb->check_fb(pb->dev, info);  in pwm_backlight_check_fb()
201 	struct pwm_bl_data *pb;  in pwm_backlight_probe()  local
220 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);  in pwm_backlight_probe()
221 	if (!pb) {  in pwm_backlight_probe()
230 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
231 				pb->scale = data->levels[i];  in pwm_backlight_probe()
233 		pb->levels = data->levels;  in pwm_backlight_probe()
235 		pb->scale = data->max_brightness;  in pwm_backlight_probe()
237 	pb->notify = data->notify;  in pwm_backlight_probe()
238 	pb->notify_after = data->notify_after;  in pwm_backlight_probe()
239 	pb->check_fb = data->check_fb;  in pwm_backlight_probe()
240 	pb->exit = data->exit;  in pwm_backlight_probe()
241 	pb->dev = &pdev->dev;  in pwm_backlight_probe()
242 	pb->enabled = false;  in pwm_backlight_probe()
244 	pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_backlight_probe()
246 	if (IS_ERR(pb->enable_gpio)) {  in pwm_backlight_probe()
247 		ret = PTR_ERR(pb->enable_gpio);  in pwm_backlight_probe()
255 	if (!pb->enable_gpio && gpio_is_valid(data->enable_gpio)) {  in pwm_backlight_probe()
264 		pb->enable_gpio = gpio_to_desc(data->enable_gpio);  in pwm_backlight_probe()
267 	pb->power_supply = devm_regulator_get(&pdev->dev, "power");  in pwm_backlight_probe()
268 	if (IS_ERR(pb->power_supply)) {  in pwm_backlight_probe()
269 		ret = PTR_ERR(pb->power_supply);  in pwm_backlight_probe()
273 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_backlight_probe()
274 	if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER  in pwm_backlight_probe()
277 		pb->legacy = true;  in pwm_backlight_probe()
278 		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");  in pwm_backlight_probe()
281 	if (IS_ERR(pb->pwm)) {  in pwm_backlight_probe()
282 		ret = PTR_ERR(pb->pwm);  in pwm_backlight_probe()
296 	pb->period = pwm_get_period(pb->pwm);  in pwm_backlight_probe()
297 	if (!pb->period && (data->pwm_period_ns > 0)) {  in pwm_backlight_probe()
298 		pb->period = data->pwm_period_ns;  in pwm_backlight_probe()
299 		pwm_set_period(pb->pwm, data->pwm_period_ns);  in pwm_backlight_probe()
302 	pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);  in pwm_backlight_probe()
307 	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,  in pwm_backlight_probe()
337 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_remove()  local
340 	pwm_backlight_power_off(pb);  in pwm_backlight_remove()
342 	if (pb->exit)  in pwm_backlight_remove()
343 		pb->exit(&pdev->dev);  in pwm_backlight_remove()
344 	if (pb->legacy)  in pwm_backlight_remove()
345 		pwm_free(pb->pwm);  in pwm_backlight_remove()
353 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_shutdown()  local
355 	pwm_backlight_power_off(pb);  in pwm_backlight_shutdown()
362 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_suspend()  local
364 	if (pb->notify)  in pwm_backlight_suspend()
365 		pb->notify(pb->dev, 0);  in pwm_backlight_suspend()
367 	pwm_backlight_power_off(pb);  in pwm_backlight_suspend()
369 	if (pb->notify_after)  in pwm_backlight_suspend()
370 		pb->notify_after(pb->dev, 0);  in pwm_backlight_suspend()