49 static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness)  in pwm_backlight_power_on()  argument
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()
60 	pwm_enable(pb->pwm);  in pwm_backlight_power_on()
62 	if (pb->post_pwm_on_delay)  in pwm_backlight_power_on()
63 		msleep(pb->post_pwm_on_delay);  in pwm_backlight_power_on()
65 	if (pb->enable_gpio)  in pwm_backlight_power_on()
66 		gpiod_set_value_cansleep(pb->enable_gpio, 1);  in pwm_backlight_power_on()
68 	pb->enabled = true;  in pwm_backlight_power_on()
71 static void pwm_backlight_power_off(struct pwm_bl_data *pb)  in pwm_backlight_power_off()  argument
73 	if (!pb->enabled)  in pwm_backlight_power_off()
76 	if (pb->enable_gpio)  in pwm_backlight_power_off()
77 		gpiod_set_value_cansleep(pb->enable_gpio, 0);  in pwm_backlight_power_off()
79 	if (pb->pwm_off_delay)  in pwm_backlight_power_off()
80 		msleep(pb->pwm_off_delay);  in pwm_backlight_power_off()
82 	pwm_config(pb->pwm, 0, pb->period);  in pwm_backlight_power_off()
83 	pwm_disable(pb->pwm);  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()
94 	if (pb->levels)  in compute_duty_cycle()
95 		duty_cycle = pb->levels[brightness];  in compute_duty_cycle()
99 	duty_cycle *= pb->period - lth;  in compute_duty_cycle()
100 	do_div(duty_cycle, pb->scale);  in compute_duty_cycle()
107 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_update_status()  local
116 	if (pb->notify)  in pwm_backlight_update_status()
117 		brightness = pb->notify(pb->dev, brightness);  in pwm_backlight_update_status()
120 		duty_cycle = compute_duty_cycle(pb, brightness);  in pwm_backlight_update_status()
121 		pwm_config(pb->pwm, duty_cycle, pb->period);  in pwm_backlight_update_status()
122 		pwm_backlight_power_on(pb, brightness);  in pwm_backlight_update_status()
124 		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()
400 static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)  in pwm_backlight_initial_power_state()  argument
402 	struct device_node *node = pb->dev->of_node;  in pwm_backlight_initial_power_state()
416 	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()
424 	if (!pwm_is_enabled(pb->pwm))  in pwm_backlight_initial_power_state()
437 	struct pwm_bl_data *pb;  in pwm_backlight_probe()  local
459 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);  in pwm_backlight_probe()
460 	if (!pb) {  in pwm_backlight_probe()
465 	pb->notify = data->notify;  in pwm_backlight_probe()
466 	pb->notify_after = data->notify_after;  in pwm_backlight_probe()
467 	pb->check_fb = data->check_fb;  in pwm_backlight_probe()
468 	pb->exit = data->exit;  in pwm_backlight_probe()
469 	pb->dev = &pdev->dev;  in pwm_backlight_probe()
470 	pb->enabled = false;  in pwm_backlight_probe()
471 	pb->post_pwm_on_delay = data->post_pwm_on_delay;  in pwm_backlight_probe()
472 	pb->pwm_off_delay = data->pwm_off_delay;  in pwm_backlight_probe()
474 	pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_backlight_probe()
476 	if (IS_ERR(pb->enable_gpio)) {  in pwm_backlight_probe()
477 		ret = PTR_ERR(pb->enable_gpio);  in pwm_backlight_probe()
485 	if (!pb->enable_gpio && gpio_is_valid(data->enable_gpio)) {  in pwm_backlight_probe()
494 		pb->enable_gpio = gpio_to_desc(data->enable_gpio);  in pwm_backlight_probe()
505 	if (pb->enable_gpio &&  in pwm_backlight_probe()
506 	    gpiod_get_direction(pb->enable_gpio) != 0)  in pwm_backlight_probe()
507 		gpiod_direction_output(pb->enable_gpio, 1);  in pwm_backlight_probe()
509 	pb->power_supply = devm_regulator_get(&pdev->dev, "power");  in pwm_backlight_probe()
510 	if (IS_ERR(pb->power_supply)) {  in pwm_backlight_probe()
511 		ret = PTR_ERR(pb->power_supply);  in pwm_backlight_probe()
515 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_backlight_probe()
516 	if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {  in pwm_backlight_probe()
518 		pb->legacy = true;  in pwm_backlight_probe()
519 		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");  in pwm_backlight_probe()
522 	if (IS_ERR(pb->pwm)) {  in pwm_backlight_probe()
523 		ret = PTR_ERR(pb->pwm);  in pwm_backlight_probe()
533 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_probe()
545 		if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
546 			pb->scale = data->levels[i];  in pwm_backlight_probe()
548 		pb->levels = data->levels;  in pwm_backlight_probe()
555 	pwm_apply_args(pb->pwm);  in pwm_backlight_probe()
563 	pwm_get_args(pb->pwm, &pargs);  in pwm_backlight_probe()
564 	pb->period = pargs.period;  in pwm_backlight_probe()
565 	if (!pb->period && (data->pwm_period_ns > 0))  in pwm_backlight_probe()
566 		pb->period = data->pwm_period_ns;  in pwm_backlight_probe()
568 	pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);  in pwm_backlight_probe()
573 	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,  in pwm_backlight_probe()
578 		if (pb->legacy)  in pwm_backlight_probe()
579 			pwm_free(pb->pwm);  in pwm_backlight_probe()
591 	bl->props.power = pwm_backlight_initial_power_state(pb);  in pwm_backlight_probe()
606 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_remove()  local
609 	pwm_backlight_power_off(pb);  in pwm_backlight_remove()
611 	if (pb->exit)  in pwm_backlight_remove()
612 		pb->exit(&pdev->dev);  in pwm_backlight_remove()
613 	if (pb->legacy)  in pwm_backlight_remove()
614 		pwm_free(pb->pwm);  in pwm_backlight_remove()
622 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_shutdown()  local
624 	pwm_backlight_power_off(pb);  in pwm_backlight_shutdown()
631 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_suspend()  local
633 	if (pb->notify)  in pwm_backlight_suspend()
634 		pb->notify(pb->dev, 0);  in pwm_backlight_suspend()
636 	pwm_backlight_power_off(pb);  in pwm_backlight_suspend()
638 	if (pb->notify_after)  in pwm_backlight_suspend()
639 		pb->notify_after(pb->dev, 0);  in pwm_backlight_suspend()