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/linux/Documentation/devicetree/bindings/leds/backlight/
H A Dcommon.yaml20 default-brightness:
22 The default brightness that should be applied to the LED by the operating
23 system on start-up. The brightness should not exceed the brightness the
27 max-brightness:
29 Normally the maximum brightness is determined by the hardware and this
31 on the brightness apart from what the driver says, as it could happen
36 brightness-levels:
38 Array of distinct brightness levels. The levels must be in the range
42 The 0 value means a 0% of brightness (darkest/off), while the last value
43 in the array represents a full 100% brightness (brightest).
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H A Dpwm-backlight.yaml47 Number of interpolated steps between each value of brightness-levels
49 having to list out every possible value in the brightness-level array.
53 default-brightness-level: [brightness-levels]
54 num-interpolated-steps: [brightness-levels]
68 brightness-levels = <0 4 8 16 32 64 128 255>;
69 default-brightness-level = <6>;
83 brightness-levels = <0 2048 4096 8192 16384 65535>;
85 default-brightness-level = <4096>;
/linux/drivers/video/backlight/
H A Dktd253-backlight.c77 int brightness = backlight_get_brightness(bl); in ktd253_backlight_update_status() local
82 dev_dbg(ktd253->dev, "new brightness/ratio: %d/32\n", brightness); in ktd253_backlight_update_status()
84 target_ratio = brightness; in ktd253_backlight_update_status()
148 u32 brightness; in ktd253_backlight_probe() local
156 ret = device_property_read_u32(dev, "max-brightness", &max_brightness); in ktd253_backlight_probe()
160 /* Clamp brightness to hardware max */ in ktd253_backlight_probe()
161 dev_err(dev, "illegal max brightness specified\n"); in ktd253_backlight_probe()
165 ret = device_property_read_u32(dev, "default-brightness", &brightness); in ktd253_backlight_probe()
167 brightness = KTD253_DEFAULT_RATIO; in ktd253_backlight_probe()
168 if (brightness > max_brightness) { in ktd253_backlight_probe()
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H A Daat2870_bl.c24 int brightness; /* current brightness */ member
28 int brightness) in aat2870_brightness() argument
33 val = brightness * (aat2870_bl->max_current - 1); in aat2870_brightness()
61 int brightness = backlight_get_brightness(bd); in aat2870_bl_update_status() local
64 if ((brightness < 0) || (bd->props.max_brightness < brightness)) { in aat2870_bl_update_status()
65 dev_err(&bd->dev, "invalid brightness, %d\n", brightness); in aat2870_bl_update_status()
69 dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n", in aat2870_bl_update_status()
70 bd->props.brightness, bd->props.power, bd->props.state); in aat2870_bl_update_status()
73 (u8)aat2870_brightness(aat2870_bl, brightness)); in aat2870_bl_update_status()
77 if (brightness == 0) { in aat2870_bl_update_status()
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H A Dmt6370-backlight.c76 int brightness = backlight_get_brightness(bl_dev); in mt6370_bl_update_status() local
81 if (brightness) { in mt6370_bl_update_status()
82 brightness_val[0] = (brightness - 1) & priv->dim2_mask; in mt6370_bl_update_status()
83 brightness_val[1] = (brightness - 1) >> priv->dim2_shift; in mt6370_bl_update_status()
91 gpiod_set_value(priv->enable_gpio, !!brightness); in mt6370_bl_update_status()
93 enable_val = brightness ? MT6370_BL_EN_MASK : 0; in mt6370_bl_update_status()
103 int brightness, ret; in mt6370_bl_get_brightness() local
117 brightness = brightness_val[1] << priv->dim2_shift; in mt6370_bl_get_brightness()
118 brightness += brightness_val[0] & priv->dim2_mask; in mt6370_bl_get_brightness()
120 return brightness + 1; in mt6370_bl_get_brightness()
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H A Dktd2801-backlight.c36 u8 brightness = (u8) backlight_get_brightness(bd); in ktd2801_update_status() local
49 expresswire_write_u8(&ktd2801->props, brightness); in ktd2801_update_status()
63 u32 brightness, max_brightness; in ktd2801_backlight_probe() local
72 ret = device_property_read_u32(dev, "max-brightness", &max_brightness); in ktd2801_backlight_probe()
76 dev_err(dev, "illegal max brightness specified\n"); in ktd2801_backlight_probe()
80 ret = device_property_read_u32(dev, "default-brightness", &brightness); in ktd2801_backlight_probe()
82 brightness = KTD2801_DEFAULT_BRIGHTNESS; in ktd2801_backlight_probe()
83 if (brightness > max_brightness) { in ktd2801_backlight_probe()
84 dev_err(dev, "default brightness exceeds max\n"); in ktd2801_backlight_probe()
85 brightness = max_brightness; in ktd2801_backlight_probe()
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H A Dlm3639_bl.c65 /* init brightness */ in lm3639_chip_init()
93 /* update and get brightness */
111 pdata->pwm_set_intensity(bl->props.brightness, in lm3639_bled_update_status()
116 return bl->props.brightness; in lm3639_bled_update_status()
120 ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness); in lm3639_bled_update_status()
123 ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness); in lm3639_bled_update_status()
127 if (!bl->props.brightness) in lm3639_bled_update_status()
134 return bl->props.brightness; in lm3639_bled_update_status()
137 return bl->props.brightness; in lm3639_bled_update_status()
149 bl->props.brightness = pdata->pwm_get_intensity(); in lm3639_bled_get_brightness()
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H A Drt4831-backlight.c42 int brightness = backlight_get_brightness(bl_dev); in rt4831_bl_update_status() local
43 unsigned int enable = brightness ? RT4831_BLEN_MASK : 0; in rt4831_bl_update_status()
47 if (brightness) { in rt4831_bl_update_status()
48 v[0] = (brightness - 1) & RT4831_BLDIML_MASK; in rt4831_bl_update_status()
49 v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT; in rt4831_bl_update_status()
94 u32 brightness, ocp_uA; in rt4831_parse_backlight_properties() local
99 ret = device_property_read_u32(dev, "max-brightness", &brightness); in rt4831_parse_backlight_properties()
101 brightness = RT4831_BLMAX_BRIGHTNESS; in rt4831_parse_backlight_properties()
103 bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS); in rt4831_parse_backlight_properties()
105 ret = device_property_read_u32(dev, "default-brightness", &brightness); in rt4831_parse_backlight_properties()
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H A Dmp3309c.c117 int brightness = backlight_get_brightness(bl); in mp3309c_bl_update_status() local
128 chip->pdata->levels[brightness], in mp3309c_bl_update_status()
144 if (brightness > 0) { in mp3309c_bl_update_status()
153 if (brightness == 0) in mp3309c_bl_update_status()
161 * The first time, before setting brightness, we must enable the in mp3309c_bl_update_status()
177 analog_val = brightness; in mp3309c_bl_update_status()
186 if (brightness > 0) in mp3309c_bl_update_status()
235 * Analog (by I2C commands) control mode: fixed 0..31 brightness in mp3309c_parse_fwnode()
247 * PWM control mode: check for brightness level in DT in mp3309c_parse_fwnode()
249 if (device_property_present(dev, "brightness-levels")) { in mp3309c_parse_fwnode()
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H A Dpwm_bl.c33 int brightness);
35 int brightness);
75 static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness, struct pwm_state *state) in compute_duty_cycle() argument
81 duty_cycle = pb->levels[brightness]; in compute_duty_cycle()
83 duty_cycle = brightness; in compute_duty_cycle()
94 int brightness = backlight_get_brightness(bl); in pwm_backlight_update_status() local
98 brightness = pb->notify(pb->dev, brightness); in pwm_backlight_update_status()
100 if (brightness > 0) { in pwm_backlight_update_status()
102 state.duty_cycle = compute_duty_cycle(pb, brightness, &state); in pwm_backlight_update_status()
125 pb->notify_after(pb->dev, brightness); in pwm_backlight_update_status()
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H A Dpandora_bl.c41 int brightness = bl->props.brightness; in pandora_backlight_update_status() local
46 brightness = 0; in pandora_backlight_update_status()
48 brightness = 0; in pandora_backlight_update_status()
50 brightness = 0; in pandora_backlight_update_status()
52 if ((unsigned int)brightness > MAX_USER_VALUE) in pandora_backlight_update_status()
53 brightness = MAX_USER_VALUE; in pandora_backlight_update_status()
55 if (brightness == 0) { in pandora_backlight_update_status()
92 twl_i2c_write_u8(TWL_MODULE_PWM, MIN_VALUE + brightness, TWL_PWM0_OFF); in pandora_backlight_update_status()
95 if (brightness != 0) in pandora_backlight_update_status()
135 bl->props.brightness = MAX_USER_VALUE; in pandora_backlight_probe()
H A Dlm3630a_bl.c104 /* set brightness A and B */ in lm3630a_chip_init()
186 /* update and get brightness */
192 int brightness = backlight_get_brightness(bl); in lm3630a_bank_a_update_status() local
196 return lm3630a_pwm_ctrl(pchip, brightness, in lm3630a_bank_a_update_status()
204 /* minimum brightness is 0x04 */ in lm3630a_bank_a_update_status()
205 ret = lm3630a_write(pchip, REG_BRT_A, brightness); in lm3630a_bank_a_update_status()
207 if (brightness < 0x4) in lm3630a_bank_a_update_status()
224 int brightness, rval; in lm3630a_bank_a_get_brightness() local
232 brightness = (rval & 0x01) << 8; in lm3630a_bank_a_get_brightness()
236 brightness |= rval; in lm3630a_bank_a_get_brightness()
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/linux/drivers/platform/x86/
H A Dsilicom-platform.c201 enum led_brightness brightness = LED_OFF; in silicom_mec_led_mc_brightness_get() local
205 mc_cdev->subled_info[i].brightness = in silicom_mec_led_mc_brightness_get()
207 /* Mark the overall brightness as LED_ON if any of the subleds are on */ in silicom_mec_led_mc_brightness_get()
208 if (mc_cdev->subled_info[i].brightness != LED_OFF) in silicom_mec_led_mc_brightness_get()
209 brightness = LED_ON; in silicom_mec_led_mc_brightness_get()
212 return brightness; in silicom_mec_led_mc_brightness_get()
216 enum led_brightness brightness) in silicom_mec_led_mc_brightness_set() argument
221 led_mc_calc_color_components(mc_cdev, brightness); in silicom_mec_led_mc_brightness_set()
224 mc_cdev->subled_info[i].brightness); in silicom_mec_led_mc_brightness_set()
288 .brightness = 1,
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/linux/Documentation/leds/
H A Dleds-lm3556.rst26 LM3556 Flash can be controlled through /sys/class/leds/flash/brightness file
28 * if STROBE pin is enabled, below example control brightness only, and
35 #echo 0 > /sys/class/leds/flash/brightness
39 #echo 1 > /sys/class/leds/flash/brightness
45 #echo 16 > /sys/class/leds/flash/brightness
54 LM3556 torch can be controlled through /sys/class/leds/torch/brightness file.
55 * if TORCH pin is enabled, below example control brightness only,
62 #echo 0 > /sys/class/leds/torch/brightness
66 #echo 1 > /sys/class/leds/torch/brightness
72 #echo 8 > /sys/class/leds/torch/brightness
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H A Dleds-class-multicolor.rst12 via brightness file.
37 -rw-r--r-- 1 root root 4096 Oct 19 16:16 brightness
44 Multicolor Class Brightness Control
46 The brightness level for each LED is calculated based on the color LED
48 the requested brightness.
50 ``led_brightness = brightness * multi_intensity/max_brightness``
53 A user first writes the multi_intensity file with the brightness levels
76 The user can control the brightness of that multicolor LED group by writing the
77 global 'brightness' control. Assuming a max_brightness of 255 the user
79 128 to the global brightness file then the values written to each LED will be
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/linux/include/linux/platform_data/x86/
H A Dnvidia-wmi-ec-backlight.h13 * @WMI_BRIGHTNESS_METHOD_LEVEL: Get/Set EC brightness level status
14 * @WMI_BRIGHTNESS_METHOD_SOURCE: Get/Set EC Brightness Source
24 * @WMI_BRIGHTNESS_MODE_GET: Get the current brightness level/source.
25 * @WMI_BRIGHTNESS_MODE_SET: Set the brightness level.
26 * @WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL: Get the maximum brightness level. This
38 * enum wmi_brightness_source - Backlight brightness control source selection
39 * @WMI_BRIGHTNESS_SOURCE_GPU: Backlight brightness is controlled by the GPU.
40 * @WMI_BRIGHTNESS_SOURCE_EC: Backlight brightness is controlled by the
42 * @WMI_BRIGHTNESS_SOURCE_AUX: Backlight brightness is controlled over the
66 * brightness value when the WMI method ID is %WMI_BRIGHTNESS_METHOD_LEVEL, or
/linux/Documentation/devicetree/bindings/leds/
H A Dleds-trigger-pattern.txt3 The pattern is given by a series of tuples, of brightness and duration (ms).
4 The LED is expected to traverse the series and each brightness value for the
5 specified duration. Duration of 0 means brightness should immediately change to
10 change of brightness, i.e. the subsequent brightness will be applied without
22 LED brightness
31 2. To make the LED go instantly from one brightness value to another, we should
32 use zero-time lengths (the brightness must be same as the previous tuple's). So
39 It will make the LED stay off for one second, then stay at max brightness for
42 LED brightness
H A Dleds-pwm.yaml32 max-brightness:
34 Maximum brightness possible for the LED
37 default-brightness:
39 Brightness to be set if LED's default state is on. Used only during
40 initialization. If the option is not set then max brightness is used.
45 - max-brightness
60 max-brightness = <127>;
67 max-brightness = <255>;
H A Dleds-netxbig.txt18 - bright-addr: Brightness register address on gpio-ext bus.
19 - max-brightness: Maximum brightness value.
43 max-brightness = <7>;
52 max-brightness = <7>;
62 max-brightness = <7>;
71 max-brightness = <7>;
81 max-brightness = <7>;
90 max-brightness = <7>;
/linux/drivers/leds/
H A Dled-core.c69 unsigned long brightness; in led_timer_function() local
84 brightness = led_get_brightness(led_cdev); in led_timer_function()
85 if (!brightness) { in led_timer_function()
89 brightness = led_cdev->new_blink_brightness; in led_timer_function()
91 brightness = led_cdev->blink_brightness; in led_timer_function()
94 /* Store the current brightness value to be able in led_timer_function()
97 led_cdev->blink_brightness = brightness; in led_timer_function()
98 brightness = LED_OFF; in led_timer_function()
102 led_set_brightness_nosleep(led_cdev, brightness); in led_timer_function()
110 if (brightness) in led_timer_function()
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H A Dleds-pwm.c41 enum led_brightness brightness) in led_pwm_set() argument
48 duty *= brightness; in led_pwm_set()
71 ret = fwnode_property_read_u32(fwnode, "default-brightness", in led_pwm_default_brightness_get()
89 led_data->cdev.brightness = LED_OFF; in led_pwm_add()
117 /* set brightness */ in led_pwm_add()
120 led_data->cdev.brightness = in led_pwm_add()
125 uint64_t brightness; in led_pwm_add() local
127 brightness = led->max_brightness; in led_pwm_add()
128 brightness *= led_data->pwmstate.duty_cycle; in led_pwm_add()
129 do_div(brightness, led_data->pwmstate.period); in led_pwm_add()
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H A Dleds-lm3530.c61 /* Brightness Ramp Rate Register */
81 /* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
102 * @brightness: previous brightness value
111 enum led_brightness brightness; member
229 u8 brightness; in lm3530_init_registers() local
258 if (drvdata->brightness) in lm3530_init_registers()
259 brightness = drvdata->brightness; in lm3530_init_registers()
261 brightness = drvdata->brightness = pdata->brt_val; in lm3530_init_registers()
263 if (brightness > drvdata->led_dev.max_brightness) in lm3530_init_registers()
264 brightness = drvdata->led_dev.max_brightness; in lm3530_init_registers()
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/linux/drivers/net/wireless/ralink/rt2x00/
H A Drt2x00leds.c22 unsigned int brightness; in rt2x00leds_led_quality() local
55 brightness = ((LED_FULL / 6) * rssi) + 1; in rt2x00leds_led_quality()
56 if (brightness != led->led_dev.brightness) { in rt2x00leds_led_quality()
57 led->led_dev.brightness_set(&led->led_dev, brightness); in rt2x00leds_led_quality()
58 led->led_dev.brightness = brightness; in rt2x00leds_led_quality()
64 unsigned int brightness = enabled ? LED_FULL : LED_OFF; in rt2x00led_led_simple() local
69 led->led_dev.brightness_set(&led->led_dev, brightness); in rt2x00led_led_simple()
70 led->led_dev.brightness = brightness; in rt2x00led_led_simple()
99 led->led_dev.brightness = LED_OFF; in rt2x00leds_register_led()
203 led->led_dev.brightness = LED_OFF; in rt2x00leds_suspend_led()
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/linux/drivers/platform/chrome/
H A Dcros_kbd_led_backlight.c30 * @brightness_get: Get LED brightness level.
31 * @brightness_set: Set LED brightness level. Must not sleep.
32 * @brightness_set_blocking: Set LED brightness level. It can block the
35 * @max_brightness: Maximum brightness.
45 enum led_brightness brightness);
47 enum led_brightness brightness);
62 enum led_brightness brightness) in keyboard_led_set_brightness_acpi() argument
69 param.integer.value = brightness; in keyboard_led_set_brightness_acpi()
83 unsigned long long brightness; in keyboard_led_get_brightness_acpi() local
87 NULL, &brightness); in keyboard_led_get_brightness_acpi()
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/linux/Documentation/ABI/testing/
H A Dsysfs-class-backlight6 Description of the scale of the brightness curve.
8 The human eye senses brightness approximately logarithmically,
9 hence linear changes in brightness are perceived as being
10 non-linear. To achieve a linear perception of brightness changes
12 backlights with a linear brightness curve.
17 The scale of the brightness curve is unknown.
20 The brightness changes linearly with each step. Brightness
25 The brightness changes non-linearly with each step. Brightness
43 brightness).
56 (RW) Read or write the specific brightness level at which the
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