Lines Matching refs:pb
42 static void pwm_backlight_power_on(struct pwm_bl_data *pb)
47 pwm_get_state(pb->pwm, &state);
48 if (pb->enabled)
51 err = regulator_enable(pb->power_supply);
53 dev_err(pb->dev, "failed to enable power supply\n");
56 pwm_apply_state(pb->pwm, &state);
58 if (pb->post_pwm_on_delay)
59 msleep(pb->post_pwm_on_delay);
61 if (pb->enable_gpio)
62 gpiod_set_value_cansleep(pb->enable_gpio, 1);
64 pb->enabled = true;
67 static void pwm_backlight_power_off(struct pwm_bl_data *pb)
71 pwm_get_state(pb->pwm, &state);
72 if (!pb->enabled)
75 if (pb->enable_gpio)
76 gpiod_set_value_cansleep(pb->enable_gpio, 0);
78 if (pb->pwm_off_delay)
79 msleep(pb->pwm_off_delay);
83 pwm_apply_state(pb->pwm, &state);
85 regulator_disable(pb->power_supply);
86 pb->enabled = false;
89 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)
91 unsigned int lth = pb->lth_brightness;
95 pwm_get_state(pb->pwm, &state);
97 if (pb->levels)
98 duty_cycle = pb->levels[brightness];
103 do_div(duty_cycle, pb->scale);
110 struct pwm_bl_data *pb = bl_get_data(bl);
114 if (pb->notify)
115 brightness = pb->notify(pb->dev, brightness);
118 pwm_get_state(pb->pwm, &state);
119 state.duty_cycle = compute_duty_cycle(pb, brightness);
120 pwm_apply_state(pb->pwm, &state);
121 pwm_backlight_power_on(pb);
123 pwm_backlight_power_off(pb);
126 if (pb->notify_after)
127 pb->notify_after(pb->dev, brightness);
135 struct pwm_bl_data *pb = bl_get_data(bl);
137 return !pb->check_fb || pb->check_fb(pb->dev, info);
417 static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
419 struct device_node *node = pb->dev->of_node;
426 if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)
429 if (!regulator_is_enabled(pb->power_supply))
432 if (!pwm_is_enabled(pb->pwm))
439 if (pb->enable_gpio)
440 gpiod_direction_output(pb->enable_gpio, active);
443 * Do not change pb->enabled here! pb->enabled essentially
468 struct pwm_bl_data *pb;
489 pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);
490 if (!pb) {
495 pb->notify = data->notify;
496 pb->notify_after = data->notify_after;
497 pb->check_fb = data->check_fb;
498 pb->exit = data->exit;
499 pb->dev = &pdev->dev;
500 pb->enabled = false;
501 pb->post_pwm_on_delay = data->post_pwm_on_delay;
502 pb->pwm_off_delay = data->pwm_off_delay;
504 pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
506 if (IS_ERR(pb->enable_gpio)) {
507 ret = PTR_ERR(pb->enable_gpio);
511 pb->power_supply = devm_regulator_get(&pdev->dev, "power");
512 if (IS_ERR(pb->power_supply)) {
513 ret = PTR_ERR(pb->power_supply);
517 pb->pwm = devm_pwm_get(&pdev->dev, NULL);
518 if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {
520 pb->legacy = true;
521 pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
524 if (IS_ERR(pb->pwm)) {
525 ret = PTR_ERR(pb->pwm);
534 pwm_init_state(pb->pwm, &state);
545 ret = pwm_apply_state(pb->pwm, &state);
555 pb->levels = data->levels;
563 if (data->levels[i] > pb->scale)
564 pb->scale = data->levels[i];
580 pwm_get_state(pb->pwm, &state);
591 if (data->levels[i] > pb->scale)
592 pb->scale = data->levels[i];
594 pb->levels = data->levels;
603 pb->scale = data->max_brightness;
606 pb->lth_brightness = data->lth_brightness * (div_u64(state.period,
607 pb->scale));
611 bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,
616 if (pb->legacy)
617 pwm_free(pb->pwm);
629 bl->props.power = pwm_backlight_initial_power_state(pb);
644 struct pwm_bl_data *pb = bl_get_data(bl);
647 pwm_backlight_power_off(pb);
649 if (pb->exit)
650 pb->exit(&pdev->dev);
651 if (pb->legacy)
652 pwm_free(pb->pwm);
660 struct pwm_bl_data *pb = bl_get_data(bl);
662 pwm_backlight_power_off(pb);
669 struct pwm_bl_data *pb = bl_get_data(bl);
671 if (pb->notify)
672 pb->notify(pb->dev, 0);
674 pwm_backlight_power_off(pb);
676 if (pb->notify_after)
677 pb->notify_after(pb->dev, 0);