47 static void pwm_backlight_power_on(struct pwm_bl_data *pb)  in pwm_backlight_power_on()  argument
52 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_power_on()
53 	if (pb->enabled)  in pwm_backlight_power_on()
56 	err = regulator_enable(pb->power_supply);  in pwm_backlight_power_on()
58 		dev_err(pb->dev, "failed to enable power supply\n");  in pwm_backlight_power_on()
61 	pwm_apply_state(pb->pwm, &state);  in pwm_backlight_power_on()
63 	if (pb->post_pwm_on_delay)  in pwm_backlight_power_on()
64 		msleep(pb->post_pwm_on_delay);  in pwm_backlight_power_on()
66 	if (pb->enable_gpio)  in pwm_backlight_power_on()
67 		gpiod_set_value_cansleep(pb->enable_gpio, 1);  in pwm_backlight_power_on()
69 	pb->enabled = true;  in pwm_backlight_power_on()
72 static void pwm_backlight_power_off(struct pwm_bl_data *pb)  in pwm_backlight_power_off()  argument
76 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_power_off()
77 	if (!pb->enabled)  in pwm_backlight_power_off()
80 	if (pb->enable_gpio)  in pwm_backlight_power_off()
81 		gpiod_set_value_cansleep(pb->enable_gpio, 0);  in pwm_backlight_power_off()
83 	if (pb->pwm_off_delay)  in pwm_backlight_power_off()
84 		msleep(pb->pwm_off_delay);  in pwm_backlight_power_off()
88 	pwm_apply_state(pb->pwm, &state);  in pwm_backlight_power_off()
90 	regulator_disable(pb->power_supply);  in pwm_backlight_power_off()
91 	pb->enabled = false;  in pwm_backlight_power_off()
94 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)  in compute_duty_cycle()  argument
96 	unsigned int lth = pb->lth_brightness;  in compute_duty_cycle()
100 	pwm_get_state(pb->pwm, &state);  in compute_duty_cycle()
102 	if (pb->levels)  in compute_duty_cycle()
103 		duty_cycle = pb->levels[brightness];  in compute_duty_cycle()
108 	do_div(duty_cycle, pb->scale);  in compute_duty_cycle()
115 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_update_status()  local
119 	if (pb->notify)  in pwm_backlight_update_status()
120 		brightness = pb->notify(pb->dev, brightness);  in pwm_backlight_update_status()
123 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_update_status()
124 		state.duty_cycle = compute_duty_cycle(pb, brightness);  in pwm_backlight_update_status()
125 		pwm_apply_state(pb->pwm, &state);  in pwm_backlight_update_status()
126 		pwm_backlight_power_on(pb);  in pwm_backlight_update_status()
128 		pwm_backlight_power_off(pb);  in pwm_backlight_update_status()
131 	if (pb->notify_after)  in pwm_backlight_update_status()
132 		pb->notify_after(pb->dev, brightness);  in pwm_backlight_update_status()
140 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_check_fb()  local
142 	return !pb->check_fb || pb->check_fb(pb->dev, info);  in pwm_backlight_check_fb()
422 static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)  in pwm_backlight_initial_power_state()  argument
424 	struct device_node *node = pb->dev->of_node;  in pwm_backlight_initial_power_state()
431 	if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)  in pwm_backlight_initial_power_state()
434 	if (!regulator_is_enabled(pb->power_supply))  in pwm_backlight_initial_power_state()
437 	if (!pwm_is_enabled(pb->pwm))  in pwm_backlight_initial_power_state()
444 	if (pb->enable_gpio)  in pwm_backlight_initial_power_state()
445 		gpiod_direction_output(pb->enable_gpio, active);  in pwm_backlight_initial_power_state()
448 	 * Do not change pb->enabled here! pb->enabled essentially  in pwm_backlight_initial_power_state()
473 	struct pwm_bl_data *pb;  in pwm_backlight_probe()  local
494 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);  in pwm_backlight_probe()
495 	if (!pb) {  in pwm_backlight_probe()
500 	pb->notify = data->notify;  in pwm_backlight_probe()
501 	pb->notify_after = data->notify_after;  in pwm_backlight_probe()
502 	pb->check_fb = data->check_fb;  in pwm_backlight_probe()
503 	pb->exit = data->exit;  in pwm_backlight_probe()
504 	pb->dev = &pdev->dev;  in pwm_backlight_probe()
505 	pb->enabled = false;  in pwm_backlight_probe()
506 	pb->post_pwm_on_delay = data->post_pwm_on_delay;  in pwm_backlight_probe()
507 	pb->pwm_off_delay = data->pwm_off_delay;  in pwm_backlight_probe()
509 	pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_backlight_probe()
511 	if (IS_ERR(pb->enable_gpio)) {  in pwm_backlight_probe()
512 		ret = PTR_ERR(pb->enable_gpio);  in pwm_backlight_probe()
516 	pb->power_supply = devm_regulator_get(&pdev->dev, "power");  in pwm_backlight_probe()
517 	if (IS_ERR(pb->power_supply)) {  in pwm_backlight_probe()
518 		ret = PTR_ERR(pb->power_supply);  in pwm_backlight_probe()
522 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_backlight_probe()
523 	if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {  in pwm_backlight_probe()
525 		pb->legacy = true;  in pwm_backlight_probe()
526 		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");  in pwm_backlight_probe()
529 	if (IS_ERR(pb->pwm)) {  in pwm_backlight_probe()
530 		ret = PTR_ERR(pb->pwm);  in pwm_backlight_probe()
539 	pwm_init_state(pb->pwm, &state);  in pwm_backlight_probe()
550 	ret = pwm_apply_state(pb->pwm, &state);  in pwm_backlight_probe()
560 		pb->levels = data->levels;  in pwm_backlight_probe()
568 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
569 				pb->scale = data->levels[i];  in pwm_backlight_probe()
585 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_probe()
596 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
597 				pb->scale = data->levels[i];  in pwm_backlight_probe()
599 			pb->levels = data->levels;  in pwm_backlight_probe()
608 		pb->scale = data->max_brightness;  in pwm_backlight_probe()
611 	pwm_adjust_config(pb->pwm);  in pwm_backlight_probe()
613 	pb->lth_brightness = data->lth_brightness * (div_u64(state.period,  in pwm_backlight_probe()
614 				pb->scale));  in pwm_backlight_probe()
618 	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,  in pwm_backlight_probe()
623 		if (pb->legacy)  in pwm_backlight_probe()
624 			pwm_free(pb->pwm);  in pwm_backlight_probe()
641 	bl->props.power = pwm_backlight_initial_power_state(pb);  in pwm_backlight_probe()
656 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_remove()  local
659 	pwm_backlight_power_off(pb);  in pwm_backlight_remove()
661 	if (pb->exit)  in pwm_backlight_remove()
662 		pb->exit(&pdev->dev);  in pwm_backlight_remove()
663 	if (pb->legacy)  in pwm_backlight_remove()
664 		pwm_free(pb->pwm);  in pwm_backlight_remove()
672 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_shutdown()  local
674 	pwm_backlight_power_off(pb);  in pwm_backlight_shutdown()
681 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_suspend()  local
683 	if (pb->notify)  in pwm_backlight_suspend()
684 		pb->notify(pb->dev, 0);  in pwm_backlight_suspend()
686 	pwm_backlight_power_off(pb);  in pwm_backlight_suspend()
688 	if (pb->notify_after)  in pwm_backlight_suspend()
689 		pb->notify_after(pb->dev, 0);  in pwm_backlight_suspend()