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/Linux-v5.4/Documentation/ABI/testing/
Dsysfs-class-backlight-driver-adp88701 What: /sys/class/backlight/<backlight>/<ambient light zone>_max
2 What: /sys/class/backlight/<backlight>/l1_daylight_max
3 What: /sys/class/backlight/<backlight>/l2_bright_max
4 What: /sys/class/backlight/<backlight>/l3_office_max
5 What: /sys/class/backlight/<backlight>/l4_indoor_max
6 What: /sys/class/backlight/<backlight>/l5_dark_max
12 on this <backlight>. Values are between 0 and 127. This file
16 What: /sys/class/backlight/<backlight>/<ambient light zone>_dim
17 What: /sys/class/backlight/<backlight>/l2_bright_dim
18 What: /sys/class/backlight/<backlight>/l3_office_dim
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Dsysfs-class-backlight-adp88601 sysfs interface for analog devices adp8860 backlight driver
4 The backlight brightness control operates at three different levels for the
9 What: /sys/class/backlight/<backlight>/ambient_light_level
19 What: /sys/class/backlight/<backlight>/ambient_light_zone
24 (RW) Read or write the specific level at which the backlight
30 What: /sys/class/backlight/<backlight>/l1_daylight_max
31 What: /sys/class/backlight/<backlight>/l2_office_max
32 What: /sys/class/backlight/<backlight>/l3_dark_max
37 (RW) Maximum current setting for the backlight when brightness
44 What: /sys/class/backlight/<backlight>/l1_daylight_dim
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Dsysfs-class-backlight-adp55201 sysfs interface for analog devices adp5520(01) backlight driver
4 The backlight brightness control operates at three different levels for the
8 What: /sys/class/backlight/<backlight>/daylight_max
9 What: /sys/class/backlight/<backlight>/office_max
10 What: /sys/class/backlight/<backlight>/dark_max
15 (RW) Maximum current setting for the backlight when brightness
21 What: /sys/class/backlight/<backlight>/daylight_dim
22 What: /sys/class/backlight/<backlight>/office_dim
23 What: /sys/class/backlight/<backlight>/dark_dim
28 (RW) Dim current setting for the backlight when brightness is at
Dsysfs-class-backlight-driver-lm35331 What: /sys/class/backlight/<backlight>/als_channel
9 0 - out_current0 (backlight 0)
10 1 - out_current1 (backlight 1)
12 What: /sys/class/backlight/<backlight>/als_en
19 What: /sys/class/backlight/<backlight>/id
24 Get the id of this backlight (0, 1).
26 What: /sys/class/backlight/<backlight>/linear
36 What: /sys/class/backlight/<backlight>/pwm
Dsysfs-class-backlight-lm36391 sysfs interface for Texas Instruments lm3639 backlight + flash led driver chip
4 What: /sys/class/backlight/<backlight>/bled_mode
9 (WO) Write to the backlight mapping mode. The backlight current
/Linux-v5.4/drivers/gpu/drm/i915/display/
Dintel_panel.c490 panel->backlight.min, panel->backlight.max); in scale_user_to_hw()
501 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); in clamp_user_to_hw()
502 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); in clamp_user_to_hw()
513 return scale(hw_level, panel->backlight.min, panel->backlight.max, in scale_hw_to_user()
523 WARN_ON(panel->backlight.max == 0); in intel_panel_compute_brightness()
530 return panel->backlight.max - val + panel->backlight.min; in intel_panel_compute_brightness()
560 if (panel->backlight.combination_mode) { in i9xx_get_backlight()
591 return I915_READ(BXT_BLC_PWM_DUTY(panel->backlight.controller)); in bxt_get_backlight()
599 duty_ns = pwm_get_duty_cycle(panel->backlight.pwm); in pwm_get_backlight()
629 WARN_ON(panel->backlight.max == 0); in i9xx_set_backlight()
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Dintel_dp_aux_backlight.c121 freq = dev_priv->vbt.backlight.pwm_freq_hz; in intel_dp_aux_set_pwm_freq()
220 intel_dp_aux_set_backlight(conn_state, connector->panel.backlight.level); in intel_dp_aux_enable_backlight()
235 panel->backlight.max = 0xFFFF; in intel_dp_aux_setup_backlight()
237 panel->backlight.max = 0xFF; in intel_dp_aux_setup_backlight()
239 panel->backlight.min = 0; in intel_dp_aux_setup_backlight()
240 panel->backlight.level = intel_dp_aux_get_backlight(connector); in intel_dp_aux_setup_backlight()
242 panel->backlight.enabled = panel->backlight.level != 0; in intel_dp_aux_setup_backlight()
271 dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)) in intel_dp_aux_init_backlight_funcs()
277 panel->backlight.setup = intel_dp_aux_setup_backlight; in intel_dp_aux_init_backlight_funcs()
278 panel->backlight.enable = intel_dp_aux_enable_backlight; in intel_dp_aux_init_backlight_funcs()
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/Linux-v5.4/drivers/gpu/drm/shmobile/
Dshmob_drm_backlight.c20 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; in shmob_drm_backlight_update()
34 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; in shmob_drm_backlight_get_brightness()
47 if (scon->backlight == NULL) in shmob_drm_backlight_dpms()
50 scon->backlight->props.power = mode == DRM_MODE_DPMS_ON in shmob_drm_backlight_dpms()
52 backlight_update_status(scon->backlight); in shmob_drm_backlight_dpms()
58 const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight; in shmob_drm_backlight_init()
61 struct backlight_device *backlight; in shmob_drm_backlight_init() local
66 backlight = backlight_device_register(bdata->name, dev->dev, scon, in shmob_drm_backlight_init()
68 if (IS_ERR(backlight)) { in shmob_drm_backlight_init()
70 PTR_ERR(backlight)); in shmob_drm_backlight_init()
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/Linux-v5.4/drivers/video/backlight/
Dlv5207lp.c37 struct backlight_device *backlight; member
46 static int lv5207lp_backlight_update_status(struct backlight_device *backlight) in lv5207lp_backlight_update_status() argument
48 struct lv5207lp *lv = bl_get_data(backlight); in lv5207lp_backlight_update_status()
49 int brightness = backlight->props.brightness; in lv5207lp_backlight_update_status()
51 if (backlight->props.power != FB_BLANK_UNBLANK || in lv5207lp_backlight_update_status()
52 backlight->props.fb_blank != FB_BLANK_UNBLANK || in lv5207lp_backlight_update_status()
53 backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) in lv5207lp_backlight_update_status()
70 static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, in lv5207lp_backlight_check_fb() argument
73 struct lv5207lp *lv = bl_get_data(backlight); in lv5207lp_backlight_check_fb()
88 struct backlight_device *backlight; in lv5207lp_probe() local
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Dbd6107.c72 struct backlight_device *backlight; member
81 static int bd6107_backlight_update_status(struct backlight_device *backlight) in bd6107_backlight_update_status() argument
83 struct bd6107 *bd = bl_get_data(backlight); in bd6107_backlight_update_status()
84 int brightness = backlight->props.brightness; in bd6107_backlight_update_status()
86 if (backlight->props.power != FB_BLANK_UNBLANK || in bd6107_backlight_update_status()
87 backlight->props.fb_blank != FB_BLANK_UNBLANK || in bd6107_backlight_update_status()
88 backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) in bd6107_backlight_update_status()
105 static int bd6107_backlight_check_fb(struct backlight_device *backlight, in bd6107_backlight_check_fb() argument
108 struct bd6107 *bd = bl_get_data(backlight); in bd6107_backlight_check_fb()
123 struct backlight_device *backlight; in bd6107_probe() local
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DKconfig17 (contrast and applying power to the LCD (not to the backlight!)).
147 backlight. This includes support for brightness and power.
158 This provides a backlight control internal to the Atmel LCDC
160 so it controls the backlight brightness, select this option to
161 export this as a PWM-based backlight control.
170 If you have a LCD backlight connected to the BRIGHT output of
180 Say y to enable the generic platform backlight driver previously
181 known as the Corgi backlight driver. If you have a Sharp Zaurus
185 tristate "iPAQ microcontroller backlight driver"
189 Say y to enable the backlight driver for Compaq iPAQ handheld
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/Linux-v5.4/Documentation/ABI/stable/
Dsysfs-class-backlight1 What: /sys/class/backlight/<backlight>/bl_power
11 What: /sys/class/backlight/<backlight>/brightness
16 Control the brightness for this <backlight>. Values
22 What: /sys/class/backlight/<backlight>/actual_brightness
30 What: /sys/class/backlight/<backlight>/max_brightness
35 Maximum brightness for <backlight>.
38 What: /sys/class/backlight/<backlight>/type
43 The type of interface controlled by <backlight>.
48 In the general case, when multiple backlight
54 backlight state. Platform interfaces are mostly a
/Linux-v5.4/drivers/gpu/drm/panel/
Dpanel-panasonic-vvx10f034n00.c34 struct backlight_device *backlight; member
65 if (wuxga_nt->backlight) { in wuxga_nt_panel_disable()
66 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN; in wuxga_nt_panel_disable()
67 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK; in wuxga_nt_panel_disable()
68 bl_ret = backlight_update_status(wuxga_nt->backlight); in wuxga_nt_panel_disable()
145 if (wuxga_nt->backlight) { in wuxga_nt_panel_enable()
146 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK; in wuxga_nt_panel_enable()
147 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK; in wuxga_nt_panel_enable()
148 backlight_update_status(wuxga_nt->backlight); in wuxga_nt_panel_enable()
219 wuxga_nt->backlight = of_find_backlight_by_node(np); in wuxga_nt_panel_add()
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Dpanel-seiko-43wvf1g.c49 struct backlight_device *backlight; member
131 if (p->backlight) { in seiko_panel_disable()
132 p->backlight->props.power = FB_BLANK_POWERDOWN; in seiko_panel_disable()
133 p->backlight->props.state |= BL_CORE_FBBLANK; in seiko_panel_disable()
134 backlight_update_status(p->backlight); in seiko_panel_disable()
200 if (p->backlight) { in seiko_panel_enable()
201 p->backlight->props.state &= ~BL_CORE_FBBLANK; in seiko_panel_enable()
202 p->backlight->props.power = FB_BLANK_UNBLANK; in seiko_panel_enable()
203 backlight_update_status(p->backlight); in seiko_panel_enable()
248 struct device_node *backlight; in seiko_panel_probe() local
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Dpanel-lvds.c37 struct backlight_device *backlight; member
53 if (lvds->backlight) { in panel_lvds_disable()
54 lvds->backlight->props.power = FB_BLANK_POWERDOWN; in panel_lvds_disable()
55 lvds->backlight->props.state |= BL_CORE_FBBLANK; in panel_lvds_disable()
56 backlight_update_status(lvds->backlight); in panel_lvds_disable()
100 if (lvds->backlight) { in panel_lvds_enable()
101 lvds->backlight->props.state &= ~BL_CORE_FBBLANK; in panel_lvds_enable()
102 lvds->backlight->props.power = FB_BLANK_UNBLANK; in panel_lvds_enable()
103 backlight_update_status(lvds->backlight); in panel_lvds_enable()
248 lvds->backlight = of_find_backlight_by_node(np); in panel_lvds_probe()
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/Linux-v5.4/Documentation/devicetree/bindings/mfd/
Dsky81452.txt8 - backlight : container node for backlight following the binding
9 in leds/backlight/sky81452-backlight.txt
19 backlight {
20 compatible = "skyworks,sky81452-backlight";
21 name = "pwm-backlight";
Dti-lmu.txt47 - backlight: All LMU devices have backlight child nodes.
60 [1] ../leds/backlight/ti-lmu-backlight.txt
106 backlight {
107 compatible = "ti,lm3631-backlight";
148 backlight {
149 compatible = "ti,lm3632-backlight";
152 pwm-names = "lmu-backlight";
167 backlight {
168 compatible = "ti,lm3633-backlight";
212 backlight {
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/Linux-v5.4/Documentation/devicetree/bindings/leds/backlight/
Dgpio-backlight.txt1 gpio-backlight bindings
4 - compatible: "gpio-backlight"
5 - gpios: describes the gpio that is used for enabling/disabling the backlight.
9 - default-on: enable the backlight at boot.
12 backlight {
13 compatible = "gpio-backlight";
Dsky81452-backlight.txt1 SKY81452-backlight bindings
4 - compatible : Must be "skyworks,sky81452-backlight"
7 - name : Name of backlight device. Default is 'lcd-backlight'.
22 backlight {
23 compatible = "skyworks,sky81452-backlight";
24 name = "pwm-backlight";
D88pm860x.txt1 88pm860x-backlight bindings
4 - marvell,88pm860x-iset: Current supplies on backlight device.
5 - marvell,88pm860x-pwm: PWM frequency on backlight device.
10 backlight-0 {
14 backlight-2 {
Dpwm-backlight.txt1 pwm-backlight bindings
4 - compatible: "pwm-backlight"
12 and disables the backlight (see GPIO binding[1])
14 and enabling the backlight using GPIO.
15 - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO
36 backlight {
37 compatible = "pwm-backlight";
51 backlight {
52 compatible = "pwm-backlight";
/Linux-v5.4/drivers/hid/
Dhid-picolcd_backlight.c77 data->backlight = bdev; in picolcd_init_backlight()
84 struct backlight_device *bdev = data->backlight; in picolcd_exit_backlight()
86 data->backlight = NULL; in picolcd_exit_backlight()
92 if (!data->backlight) in picolcd_resume_backlight()
94 return picolcd_set_brightness(data->backlight); in picolcd_resume_backlight()
101 if (!data->backlight) in picolcd_suspend_backlight()
104 data->backlight->props.power = FB_BLANK_POWERDOWN; in picolcd_suspend_backlight()
105 picolcd_set_brightness(data->backlight); in picolcd_suspend_backlight()
106 data->lcd_power = data->backlight->props.power = bl_power; in picolcd_suspend_backlight()
/Linux-v5.4/drivers/media/usb/gspca/gl860/
Dgl860-ov2640.c175 sd->vcur.backlight = 32; in ov2640_init_settings()
186 sd->vmax.backlight = 64; in ov2640_init_settings()
239 sd->vold.backlight = -1; in ov2640_init_pre_alt()
339 s32 backlight = sd->vcur.backlight; in ov2640_camera_settings() local
350 if (backlight != sd->vold.backlight) { in ov2640_camera_settings()
352 if (backlight < 0 || backlight > sd->vmax.backlight) in ov2640_camera_settings()
353 backlight = 0; in ov2640_camera_settings()
357 ctrl_out(gspca_dev, 0x40, 1, 0x601e + backlight , 0x0024, in ov2640_camera_settings()
359 ctrl_out(gspca_dev, 0x40, 1, 0x601e + backlight - 10, 0x0025, in ov2640_camera_settings()
457 if (backlight != sd->vold.backlight) { in ov2640_camera_settings()
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/Linux-v5.4/Documentation/devicetree/bindings/display/
Dsitronix,st7735r.txt16 - backlight: phandle of the backlight device attached to the panel
20 backlight: backlight {
21 compatible = "gpio-backlight";
34 backlight = &backlight;
/Linux-v5.4/Documentation/devicetree/bindings/display/panel/
Dsharp,lq150x1lg11.txt8 - backlight: phandle of the backlight device
17 backlight: backlight {
18 compatible = "pwm-backlight";
33 backlight = <&backlight>;

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