42 static void pwm_backlight_power_on(struct pwm_bl_data *pb)  in pwm_backlight_power_on()  argument
47 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_power_on()
48 	if (pb->enabled)  in pwm_backlight_power_on()
51 	err = regulator_enable(pb->power_supply);  in pwm_backlight_power_on()
53 		dev_err(pb->dev, "failed to enable power supply\n");  in pwm_backlight_power_on()
56 	pwm_apply_state(pb->pwm, &state);  in pwm_backlight_power_on()
58 	if (pb->post_pwm_on_delay)  in pwm_backlight_power_on()
59 		msleep(pb->post_pwm_on_delay);  in pwm_backlight_power_on()
61 	if (pb->enable_gpio)  in pwm_backlight_power_on()
62 		gpiod_set_value_cansleep(pb->enable_gpio, 1);  in pwm_backlight_power_on()
64 	pb->enabled = true;  in pwm_backlight_power_on()
67 static void pwm_backlight_power_off(struct pwm_bl_data *pb)  in pwm_backlight_power_off()  argument
71 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_power_off()
72 	if (!pb->enabled)  in pwm_backlight_power_off()
75 	if (pb->enable_gpio)  in pwm_backlight_power_off()
76 		gpiod_set_value_cansleep(pb->enable_gpio, 0);  in pwm_backlight_power_off()
78 	if (pb->pwm_off_delay)  in pwm_backlight_power_off()
79 		msleep(pb->pwm_off_delay);  in pwm_backlight_power_off()
83 	pwm_apply_state(pb->pwm, &state);  in pwm_backlight_power_off()
85 	regulator_disable(pb->power_supply);  in pwm_backlight_power_off()
86 	pb->enabled = false;  in pwm_backlight_power_off()
89 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)  in compute_duty_cycle()  argument
91 	unsigned int lth = pb->lth_brightness;  in compute_duty_cycle()
95 	pwm_get_state(pb->pwm, &state);  in compute_duty_cycle()
97 	if (pb->levels)  in compute_duty_cycle()
98 		duty_cycle = pb->levels[brightness];  in compute_duty_cycle()
103 	do_div(duty_cycle, pb->scale);  in compute_duty_cycle()
110 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_update_status()  local
114 	if (pb->notify)  in pwm_backlight_update_status()
115 		brightness = pb->notify(pb->dev, brightness);  in pwm_backlight_update_status()
118 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_update_status()
119 		state.duty_cycle = compute_duty_cycle(pb, brightness);  in pwm_backlight_update_status()
120 		pwm_apply_state(pb->pwm, &state);  in pwm_backlight_update_status()
121 		pwm_backlight_power_on(pb);  in pwm_backlight_update_status()
123 		pwm_backlight_power_off(pb);  in pwm_backlight_update_status()
126 	if (pb->notify_after)  in pwm_backlight_update_status()
127 		pb->notify_after(pb->dev, brightness);  in pwm_backlight_update_status()
135 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_check_fb()  local
137 	return !pb->check_fb || pb->check_fb(pb->dev, info);  in pwm_backlight_check_fb()
408 static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)  in pwm_backlight_initial_power_state()  argument
410 	struct device_node *node = pb->dev->of_node;  in pwm_backlight_initial_power_state()
417 	if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)  in pwm_backlight_initial_power_state()
420 	if (!regulator_is_enabled(pb->power_supply))  in pwm_backlight_initial_power_state()
423 	if (!pwm_is_enabled(pb->pwm))  in pwm_backlight_initial_power_state()
430 	if (pb->enable_gpio)  in pwm_backlight_initial_power_state()
431 		gpiod_direction_output(pb->enable_gpio, active);  in pwm_backlight_initial_power_state()
434 	 * Do not change pb->enabled here! pb->enabled essentially  in pwm_backlight_initial_power_state()
459 	struct pwm_bl_data *pb;  in pwm_backlight_probe()  local
480 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);  in pwm_backlight_probe()
481 	if (!pb) {  in pwm_backlight_probe()
486 	pb->notify = data->notify;  in pwm_backlight_probe()
487 	pb->notify_after = data->notify_after;  in pwm_backlight_probe()
488 	pb->check_fb = data->check_fb;  in pwm_backlight_probe()
489 	pb->exit = data->exit;  in pwm_backlight_probe()
490 	pb->dev = &pdev->dev;  in pwm_backlight_probe()
491 	pb->enabled = false;  in pwm_backlight_probe()
492 	pb->post_pwm_on_delay = data->post_pwm_on_delay;  in pwm_backlight_probe()
493 	pb->pwm_off_delay = data->pwm_off_delay;  in pwm_backlight_probe()
495 	pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_backlight_probe()
497 	if (IS_ERR(pb->enable_gpio)) {  in pwm_backlight_probe()
498 		ret = PTR_ERR(pb->enable_gpio);  in pwm_backlight_probe()
502 	pb->power_supply = devm_regulator_get(&pdev->dev, "power");  in pwm_backlight_probe()
503 	if (IS_ERR(pb->power_supply)) {  in pwm_backlight_probe()
504 		ret = PTR_ERR(pb->power_supply);  in pwm_backlight_probe()
508 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_backlight_probe()
509 	if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {  in pwm_backlight_probe()
511 		pb->legacy = true;  in pwm_backlight_probe()
512 		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");  in pwm_backlight_probe()
515 	if (IS_ERR(pb->pwm)) {  in pwm_backlight_probe()
516 		ret = PTR_ERR(pb->pwm);  in pwm_backlight_probe()
525 	pwm_init_state(pb->pwm, &state);  in pwm_backlight_probe()
536 	ret = pwm_apply_state(pb->pwm, &state);  in pwm_backlight_probe()
546 		pb->levels = data->levels;  in pwm_backlight_probe()
554 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
555 				pb->scale = data->levels[i];  in pwm_backlight_probe()
571 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_probe()
582 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
583 				pb->scale = data->levels[i];  in pwm_backlight_probe()
585 			pb->levels = data->levels;  in pwm_backlight_probe()
594 		pb->scale = data->max_brightness;  in pwm_backlight_probe()
597 	pb->lth_brightness = data->lth_brightness * (div_u64(state.period,  in pwm_backlight_probe()
598 				pb->scale));  in pwm_backlight_probe()
602 	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,  in pwm_backlight_probe()
607 		if (pb->legacy)  in pwm_backlight_probe()
608 			pwm_free(pb->pwm);  in pwm_backlight_probe()
620 	bl->props.power = pwm_backlight_initial_power_state(pb);  in pwm_backlight_probe()
635 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_remove()  local
638 	pwm_backlight_power_off(pb);  in pwm_backlight_remove()
640 	if (pb->exit)  in pwm_backlight_remove()
641 		pb->exit(&pdev->dev);  in pwm_backlight_remove()
642 	if (pb->legacy)  in pwm_backlight_remove()
643 		pwm_free(pb->pwm);  in pwm_backlight_remove()
651 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_shutdown()  local
653 	pwm_backlight_power_off(pb);  in pwm_backlight_shutdown()
660 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_suspend()  local
662 	if (pb->notify)  in pwm_backlight_suspend()
663 		pb->notify(pb->dev, 0);  in pwm_backlight_suspend()
665 	pwm_backlight_power_off(pb);  in pwm_backlight_suspend()
667 	if (pb->notify_after)  in pwm_backlight_suspend()
668 		pb->notify_after(pb->dev, 0);  in pwm_backlight_suspend()