Lines Matching +full:brightness +full:- +full:levels
33 unsigned int *levels; member
42 int brightness);
44 int brightness);
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()
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()
97 duty_cycle = 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()
108 int brightness = bl->props.brightness; in pwm_backlight_update_status() local
111 if (bl->props.power != FB_BLANK_UNBLANK || in pwm_backlight_update_status()
112 bl->props.fb_blank != FB_BLANK_UNBLANK || in pwm_backlight_update_status()
113 bl->props.state & BL_CORE_FBBLANK) in pwm_backlight_update_status()
114 brightness = 0; in pwm_backlight_update_status()
116 if (pb->notify) in pwm_backlight_update_status()
117 brightness = pb->notify(pb->dev, brightness); in pwm_backlight_update_status()
119 if (brightness > 0) { 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()
126 if (pb->notify_after) in pwm_backlight_update_status()
127 pb->notify_after(pb->dev, brightness); in pwm_backlight_update_status()
137 return !pb->check_fb || pb->check_fb(pb->dev, info); in pwm_backlight_check_fb()
194 * Create a default correction table for PWM values to create linear brightness
206 * Once we have 4096 levels there's little point going much higher... in pwm_backlight_brightness_default()
210 data->max_brightness = in pwm_backlight_brightness_default()
213 data->levels = devm_kcalloc(dev, data->max_brightness, in pwm_backlight_brightness_default()
214 sizeof(*data->levels), GFP_KERNEL); in pwm_backlight_brightness_default()
215 if (!data->levels) in pwm_backlight_brightness_default()
216 return -ENOMEM; in pwm_backlight_brightness_default()
219 for (i = 0; i < data->max_brightness; i++) { in pwm_backlight_brightness_default()
221 data->max_brightness, PWM_LUMINANCE_SCALE) * in pwm_backlight_brightness_default()
225 return -EINVAL; in pwm_backlight_brightness_default()
226 data->levels[i] = (unsigned int)retval; in pwm_backlight_brightness_default()
229 data->dft_brightness = data->max_brightness / 2; in pwm_backlight_brightness_default()
230 data->max_brightness--; in pwm_backlight_brightness_default()
238 struct device_node *node = dev->of_node; in pwm_backlight_parse_dt()
249 return -ENODEV; in pwm_backlight_parse_dt()
257 of_property_read_u32(node, "post-pwm-on-delay-ms", in pwm_backlight_parse_dt()
258 &data->post_pwm_on_delay); in pwm_backlight_parse_dt()
259 of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay); in pwm_backlight_parse_dt()
261 data->enable_gpio = -EINVAL; in pwm_backlight_parse_dt()
264 * Determine the number of brightness levels, if this property is not in pwm_backlight_parse_dt()
265 * set a default table of brightness levels will be used. in pwm_backlight_parse_dt()
267 prop = of_find_property(node, "brightness-levels", &length); in pwm_backlight_parse_dt()
271 data->max_brightness = length / sizeof(u32); in pwm_backlight_parse_dt()
273 /* read brightness levels from DT property */ in pwm_backlight_parse_dt()
274 if (data->max_brightness > 0) { in pwm_backlight_parse_dt()
275 size_t size = sizeof(*data->levels) * data->max_brightness; in pwm_backlight_parse_dt()
278 data->levels = devm_kzalloc(dev, size, GFP_KERNEL); in pwm_backlight_parse_dt()
279 if (!data->levels) in pwm_backlight_parse_dt()
280 return -ENOMEM; in pwm_backlight_parse_dt()
282 ret = of_property_read_u32_array(node, "brightness-levels", in pwm_backlight_parse_dt()
283 data->levels, in pwm_backlight_parse_dt()
284 data->max_brightness); in pwm_backlight_parse_dt()
288 ret = of_property_read_u32(node, "default-brightness-level", in pwm_backlight_parse_dt()
293 data->dft_brightness = value; in pwm_backlight_parse_dt()
297 * interpolation between each of the values of brightness levels in pwm_backlight_parse_dt()
298 * and creates a new pre-computed table. in pwm_backlight_parse_dt()
300 of_property_read_u32(node, "num-interpolated-steps", in pwm_backlight_parse_dt()
305 * brightness-levels table, otherwise we can't interpolate in pwm_backlight_parse_dt()
309 if (data->max_brightness < 2) { in pwm_backlight_parse_dt()
311 return -EINVAL; in pwm_backlight_parse_dt()
315 * Recalculate the number of brightness levels, now in pwm_backlight_parse_dt()
317 * steps between two levels. in pwm_backlight_parse_dt()
319 for (i = 0; i < data->max_brightness - 1; i++) { in pwm_backlight_parse_dt()
320 if ((data->levels[i + 1] - data->levels[i]) / in pwm_backlight_parse_dt()
327 dev_dbg(dev, "new number of brightness levels: %d\n", in pwm_backlight_parse_dt()
331 * Create a new table of brightness levels with all the in pwm_backlight_parse_dt()
337 return -ENOMEM; in pwm_backlight_parse_dt()
341 for (i = 0; i < data->max_brightness - 1; i++) { in pwm_backlight_parse_dt()
342 value = data->levels[i]; in pwm_backlight_parse_dt()
343 n = (data->levels[i + 1] - value) / num_steps; in pwm_backlight_parse_dt()
351 table[levels_count] = data->levels[i]; in pwm_backlight_parse_dt()
355 table[levels_count] = data->levels[i]; in pwm_backlight_parse_dt()
359 * brightness levels table and replace for the in pwm_backlight_parse_dt()
362 devm_kfree(dev, data->levels); in pwm_backlight_parse_dt()
363 data->levels = table; in pwm_backlight_parse_dt()
367 * of brightness levels. in pwm_backlight_parse_dt()
369 data->max_brightness = num_levels; in pwm_backlight_parse_dt()
372 data->max_brightness--; in pwm_backlight_parse_dt()
379 { .compatible = "pwm-backlight" },
388 return -ENODEV; in pwm_backlight_parse_dt()
396 return -ENODEV; in pwm_backlight_brightness_default()
402 struct device_node *node = pb->dev->of_node; in pwm_backlight_initial_power_state()
405 if (!node || !node->phandle) 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()
432 struct platform_pwm_backlight_data *data = dev_get_platdata(&pdev->dev); in pwm_backlight_probe()
436 struct device_node *node = pdev->dev.of_node; in pwm_backlight_probe()
444 ret = pwm_backlight_parse_dt(&pdev->dev, &defdata); in pwm_backlight_probe()
446 dev_err(&pdev->dev, "failed to find platform data\n"); in pwm_backlight_probe()
453 if (data->init) { in pwm_backlight_probe()
454 ret = data->init(&pdev->dev); in pwm_backlight_probe()
459 pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL); in pwm_backlight_probe()
461 ret = -ENOMEM; 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()
486 ret = devm_gpio_request_one(&pdev->dev, data->enable_gpio, in pwm_backlight_probe()
489 dev_err(&pdev->dev, "failed to request GPIO#%d: %d\n", in pwm_backlight_probe()
490 data->enable_gpio, ret); in pwm_backlight_probe()
494 pb->enable_gpio = gpio_to_desc(data->enable_gpio); in pwm_backlight_probe()
499 * is, if gpiod_get_direction returns either 1 or -EINVAL, change the 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()
517 dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n"); 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()
524 if (ret != -EPROBE_DEFER) in pwm_backlight_probe()
525 dev_err(&pdev->dev, "unable to request PWM\n"); in pwm_backlight_probe()
529 dev_dbg(&pdev->dev, "got pwm for backlight\n"); in pwm_backlight_probe()
531 if (!data->levels) { in pwm_backlight_probe()
533 pwm_get_state(pb->pwm, &state); in pwm_backlight_probe()
535 ret = pwm_backlight_brightness_default(&pdev->dev, data, in pwm_backlight_probe()
538 dev_err(&pdev->dev, in pwm_backlight_probe()
539 "failed to setup default brightness table\n"); in pwm_backlight_probe()
544 for (i = 0; i <= data->max_brightness; i++) { 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()
559 * period, parsed from the DT, in the PWM device. For the non-DT case, 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()
572 props.max_brightness = data->max_brightness; in pwm_backlight_probe()
573 bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb, in pwm_backlight_probe()
576 dev_err(&pdev->dev, "failed to register backlight\n"); in pwm_backlight_probe()
578 if (pb->legacy) in pwm_backlight_probe()
579 pwm_free(pb->pwm); in pwm_backlight_probe()
583 if (data->dft_brightness > data->max_brightness) { in pwm_backlight_probe()
584 dev_warn(&pdev->dev, in pwm_backlight_probe()
585 "invalid default brightness level: %u, using %u\n", in pwm_backlight_probe()
586 data->dft_brightness, data->max_brightness); in pwm_backlight_probe()
587 data->dft_brightness = data->max_brightness; in pwm_backlight_probe()
590 bl->props.brightness = data->dft_brightness; in pwm_backlight_probe()
591 bl->props.power = pwm_backlight_initial_power_state(pb); in pwm_backlight_probe()
598 if (data->exit) in pwm_backlight_probe()
599 data->exit(&pdev->dev); in pwm_backlight_probe()
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()
633 if (pb->notify) in pwm_backlight_suspend()
634 pb->notify(pb->dev, 0); in pwm_backlight_suspend()
638 if (pb->notify_after) in pwm_backlight_suspend()
639 pb->notify_after(pb->dev, 0); in pwm_backlight_suspend()
665 .name = "pwm-backlight",
678 MODULE_ALIAS("platform:pwm-backlight");