39 static void pwm_backlight_power_on(struct pwm_bl_data *pb)  in pwm_backlight_power_on()  argument
43 	if (pb->enabled)  in pwm_backlight_power_on()
46 	if (pb->power_supply) {  in pwm_backlight_power_on()
47 		err = regulator_enable(pb->power_supply);  in pwm_backlight_power_on()
49 			dev_err(pb->dev, "failed to enable power supply\n");  in pwm_backlight_power_on()
52 	if (pb->post_pwm_on_delay)  in pwm_backlight_power_on()
53 		msleep(pb->post_pwm_on_delay);  in pwm_backlight_power_on()
55 	gpiod_set_value_cansleep(pb->enable_gpio, 1);  in pwm_backlight_power_on()
57 	pb->enabled = true;  in pwm_backlight_power_on()
60 static void pwm_backlight_power_off(struct pwm_bl_data *pb)  in pwm_backlight_power_off()  argument
62 	if (!pb->enabled)  in pwm_backlight_power_off()
65 	gpiod_set_value_cansleep(pb->enable_gpio, 0);  in pwm_backlight_power_off()
67 	if (pb->pwm_off_delay)  in pwm_backlight_power_off()
68 		msleep(pb->pwm_off_delay);  in pwm_backlight_power_off()
70 	if (pb->power_supply)  in pwm_backlight_power_off()
71 		regulator_disable(pb->power_supply);  in pwm_backlight_power_off()
72 	pb->enabled = false;  in pwm_backlight_power_off()
75 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness, struct pwm_state *state)  in compute_duty_cycle()  argument
77 	unsigned int lth = pb->lth_brightness;  in compute_duty_cycle()
80 	if (pb->levels)  in compute_duty_cycle()
81 		duty_cycle = pb->levels[brightness];  in compute_duty_cycle()
86 	do_div(duty_cycle, pb->scale);  in compute_duty_cycle()
93 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_update_status()  local
97 	if (pb->notify)  in pwm_backlight_update_status()
98 		brightness = pb->notify(pb->dev, brightness);  in pwm_backlight_update_status()
101 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_update_status()
102 		state.duty_cycle = compute_duty_cycle(pb, brightness, &state);  in pwm_backlight_update_status()
104 		pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_update_status()
106 		pwm_backlight_power_on(pb);  in pwm_backlight_update_status()
108 		pwm_backlight_power_off(pb);  in pwm_backlight_update_status()
110 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_update_status()
120 		state.enabled = !pb->power_supply && !pb->enable_gpio;  in pwm_backlight_update_status()
121 		pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_update_status()
124 	if (pb->notify_after)  in pwm_backlight_update_status()
125 		pb->notify_after(pb->dev, brightness);  in pwm_backlight_update_status()
397 static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)  in pwm_backlight_initial_power_state()  argument
399 	struct device_node *node = pb->dev->of_node;  in pwm_backlight_initial_power_state()
406 	if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)  in pwm_backlight_initial_power_state()
409 	if (pb->power_supply && !regulator_is_enabled(pb->power_supply))  in pwm_backlight_initial_power_state()
412 	if (!pwm_is_enabled(pb->pwm))  in pwm_backlight_initial_power_state()
419 	gpiod_direction_output(pb->enable_gpio, active);  in pwm_backlight_initial_power_state()
422 	 * Do not change pb->enabled here! pb->enabled essentially  in pwm_backlight_initial_power_state()
446 	struct pwm_bl_data *pb;  in pwm_backlight_probe()  local
466 	pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);  in pwm_backlight_probe()
467 	if (!pb) {  in pwm_backlight_probe()
472 	pb->notify = data->notify;  in pwm_backlight_probe()
473 	pb->notify_after = data->notify_after;  in pwm_backlight_probe()
474 	pb->exit = data->exit;  in pwm_backlight_probe()
475 	pb->dev = &pdev->dev;  in pwm_backlight_probe()
476 	pb->enabled = false;  in pwm_backlight_probe()
477 	pb->post_pwm_on_delay = data->post_pwm_on_delay;  in pwm_backlight_probe()
478 	pb->pwm_off_delay = data->pwm_off_delay;  in pwm_backlight_probe()
480 	pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_backlight_probe()
482 	if (IS_ERR(pb->enable_gpio)) {  in pwm_backlight_probe()
483 		ret = dev_err_probe(&pdev->dev, PTR_ERR(pb->enable_gpio),  in pwm_backlight_probe()
488 	pb->power_supply = devm_regulator_get_optional(&pdev->dev, "power");  in pwm_backlight_probe()
489 	if (IS_ERR(pb->power_supply)) {  in pwm_backlight_probe()
490 		ret = PTR_ERR(pb->power_supply);  in pwm_backlight_probe()
492 			pb->power_supply = NULL;  in pwm_backlight_probe()
500 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_backlight_probe()
501 	if (IS_ERR(pb->pwm)) {  in pwm_backlight_probe()
502 		ret = dev_err_probe(&pdev->dev, PTR_ERR(pb->pwm),  in pwm_backlight_probe()
510 	pwm_init_state(pb->pwm, &state);  in pwm_backlight_probe()
521 	ret = pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_probe()
531 		pb->levels = data->levels;  in pwm_backlight_probe()
539 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
540 				pb->scale = data->levels[i];  in pwm_backlight_probe()
556 		pwm_get_state(pb->pwm, &state);  in pwm_backlight_probe()
567 			if (data->levels[i] > pb->scale)  in pwm_backlight_probe()
568 				pb->scale = data->levels[i];  in pwm_backlight_probe()
570 			pb->levels = data->levels;  in pwm_backlight_probe()
579 		pb->scale = data->max_brightness;  in pwm_backlight_probe()
582 	pb->lth_brightness = data->lth_brightness * (div_u64(state.period,  in pwm_backlight_probe()
583 				pb->scale));  in pwm_backlight_probe()
587 	bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,  in pwm_backlight_probe()
603 	bl->props.power = pwm_backlight_initial_power_state(pb);  in pwm_backlight_probe()
618 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_remove()  local
622 	pwm_backlight_power_off(pb);  in pwm_backlight_remove()
623 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_remove()
626 	pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_remove()
628 	if (pb->exit)  in pwm_backlight_remove()
629 		pb->exit(&pdev->dev);  in pwm_backlight_remove()
635 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_shutdown()  local
638 	pwm_backlight_power_off(pb);  in pwm_backlight_shutdown()
639 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_shutdown()
642 	pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_shutdown()
649 	struct pwm_bl_data *pb = bl_get_data(bl);  in pwm_backlight_suspend()  local
652 	if (pb->notify)  in pwm_backlight_suspend()
653 		pb->notify(pb->dev, 0);  in pwm_backlight_suspend()
655 	pwm_backlight_power_off(pb);  in pwm_backlight_suspend()
663 	pwm_get_state(pb->pwm, &state);  in pwm_backlight_suspend()
666 	pwm_apply_might_sleep(pb->pwm, &state);  in pwm_backlight_suspend()
668 	if (pb->notify_after)  in pwm_backlight_suspend()
669 		pb->notify_after(pb->dev, 0);  in pwm_backlight_suspend()