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/Linux-v5.15/Documentation/ABI/testing/
Dsysfs-class-backlight1 What: /sys/class/backlight/<backlight>/scale
28 What: /sys/class/backlight/<backlight>/ambient_light_level
49 What: /sys/class/backlight/<backlight>/ambient_light_zone
57 backlight operates.
85 /sys/class/backlight/<backlight>/max_brightness to
86 /sys/class/backlight/<backlight>/brightness.
88 What: /sys/class/backlight/<backlight>/<ambient light zone>_max
94 on this <backlight>. Values are between 0 and 127. This file
106 daylight /sys/class/backlight/<backlight>/daylight_max
107 office /sys/class/backlight/<backlight>/office_max
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Dsysfs-class-backlight-driver-lm35331 What: /sys/class/backlight/<backlight>/als_channel
10 0 out_current0 (backlight 0)
11 1 out_current1 (backlight 1)
14 What: /sys/class/backlight/<backlight>/als_en
21 What: /sys/class/backlight/<backlight>/id
26 Get the id of this backlight (0, 1).
28 What: /sys/class/backlight/<backlight>/linear
40 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-v5.15/drivers/gpu/drm/i915/display/
Dintel_panel.c499 hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); in clamp_user_to_hw()
500 hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); in clamp_user_to_hw()
511 return scale(hw_level, panel->backlight.min, panel->backlight.max, in scale_hw_to_user()
520 drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0); in intel_panel_invert_pwm_level()
527 return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min; in intel_panel_invert_pwm_level()
540 panel->backlight.pwm_funcs->set(conn_state, val); in intel_panel_set_pwm_level()
549 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0); in intel_panel_backlight_level_to_pwm()
551 val = scale(val, panel->backlight.min, panel->backlight.max, in intel_panel_backlight_level_to_pwm()
552 panel->backlight.pwm_level_min, panel->backlight.pwm_level_max); in intel_panel_backlight_level_to_pwm()
563 panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0); in intel_panel_backlight_level_from_pwm()
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Dintel_dp_aux_backlight.c125 panel->backlight.edp.intel.sdr_uses_aux = in intel_dp_aux_supports_hdr_backlight()
146 if (!panel->backlight.edp.intel.sdr_uses_aux) { in intel_dp_aux_hdr_get_backlight()
147 u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe); in intel_dp_aux_hdr_get_backlight()
153 return panel->backlight.max; in intel_dp_aux_hdr_get_backlight()
187 if (panel->backlight.edp.intel.sdr_uses_aux) { in intel_dp_aux_hdr_set_backlight()
214 if (panel->backlight.edp.intel.sdr_uses_aux) { in intel_dp_aux_hdr_enable_backlight()
220 panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level); in intel_dp_aux_hdr_enable_backlight()
237 if (panel->backlight.edp.intel.sdr_uses_aux) in intel_dp_aux_hdr_disable_backlight()
241 panel->backlight.pwm_funcs->disable(conn_state, intel_panel_invert_pwm_level(connector, 0)); in intel_dp_aux_hdr_disable_backlight()
251 if (panel->backlight.edp.intel.sdr_uses_aux) { in intel_dp_aux_hdr_setup_backlight()
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/Linux-v5.15/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-v5.15/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_get_brightness(backlight); in lv5207lp_backlight_update_status()
65 static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, in lv5207lp_backlight_check_fb() argument
68 struct lv5207lp *lv = bl_get_data(backlight); in lv5207lp_backlight_check_fb()
83 struct backlight_device *backlight; in lv5207lp_probe() local
113 backlight = devm_backlight_device_register(&client->dev, in lv5207lp_probe()
116 if (IS_ERR(backlight)) { in lv5207lp_probe()
118 return PTR_ERR(backlight); in lv5207lp_probe()
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Dbd6107.c72 struct backlight_device *backlight; member
82 static int bd6107_backlight_update_status(struct backlight_device *backlight) in bd6107_backlight_update_status() argument
84 struct bd6107 *bd = bl_get_data(backlight); in bd6107_backlight_update_status()
85 int brightness = backlight_get_brightness(backlight); in bd6107_backlight_update_status()
102 static int bd6107_backlight_check_fb(struct backlight_device *backlight, in bd6107_backlight_check_fb() argument
105 struct bd6107 *bd = bl_get_data(backlight); in bd6107_backlight_check_fb()
120 struct backlight_device *backlight; in bd6107_probe() local
163 backlight = devm_backlight_device_register(&client->dev, in bd6107_probe()
167 if (IS_ERR(backlight)) { in bd6107_probe()
169 return PTR_ERR(backlight); in bd6107_probe()
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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
177 tristate "iPAQ microcontroller backlight driver"
181 Say y to enable the backlight driver for Compaq iPAQ handheld
189 Say y to enabled the backlight driver for the Kinetic KTD253
190 which is a 1-wire GPIO-controlled backlight found in some mobile
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/Linux-v5.15/Documentation/ABI/stable/
Dsysfs-class-backlight1 What: /sys/class/backlight/<backlight>/bl_power
12 What: /sys/class/backlight/<backlight>/brightness
17 Control the brightness for this <backlight>. Values
23 What: /sys/class/backlight/<backlight>/actual_brightness
31 What: /sys/class/backlight/<backlight>/max_brightness
36 Maximum brightness for <backlight>.
39 What: /sys/class/backlight/<backlight>/type
44 The type of interface controlled by <backlight>.
49 In the general case, when multiple backlight
55 backlight state. Platform interfaces are mostly a
/Linux-v5.15/drivers/gpu/drm/tilcdc/
Dtilcdc_panel.c28 struct backlight_device *backlight; member
47 struct backlight_device *backlight = panel_encoder->mod->backlight; in panel_encoder_dpms() local
50 if (backlight) { in panel_encoder_dpms()
51 backlight->props.power = mode == DRM_MODE_DPMS_ON ? in panel_encoder_dpms()
53 backlight_update_status(backlight); in panel_encoder_dpms()
307 struct backlight_device *backlight; in panel_probe() local
323 backlight = devm_of_find_backlight(&pdev->dev); in panel_probe()
324 if (IS_ERR(backlight)) in panel_probe()
325 return PTR_ERR(backlight); in panel_probe()
326 panel_mod->backlight = backlight; in panel_probe()
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/Linux-v5.15/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-v5.15/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-v5.15/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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Dgl860-mi1320.c177 sd->vcur.backlight = 0; in mi1320_init_settings()
189 sd->vmax.backlight = 2; in mi1320_init_settings()
254 sd->vold.backlight = -1; in mi1320_init_pre_alt()
340 s32 backlight = sd->vcur.backlight; in mi1320_camera_settings() local
455 if (backlight != sd->vold.backlight) { in mi1320_camera_settings()
456 sd->vold.backlight = backlight; in mi1320_camera_settings()
457 if (backlight < 0 || backlight > sd->vmax.backlight) in mi1320_camera_settings()
458 backlight = 0; in mi1320_camera_settings()
460 backlight = tbl_backlight[backlight]; in mi1320_camera_settings()
465 ctrl_out(gspca_dev, 0x40, 1, 0xba80 + backlight, 0x00f1, in mi1320_camera_settings()
/Linux-v5.15/Documentation/devicetree/bindings/leds/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 {
Dzii,rave-sp-backlight.txt3 RAVE SP backlight device is a "MFD cell" device corresponding to
4 backlight functionality of RAVE Supervisory Processor. It is expected
11 - compatible: Should be "zii,rave-sp-backlight"
19 backlight {
20 compatible = "zii,rave-sp-backlight";
/Linux-v5.15/Documentation/gpu/
Dbacklight.rst5 .. kernel-doc:: drivers/video/backlight/backlight.c
8 .. kernel-doc:: include/linux/backlight.h
11 .. kernel-doc:: drivers/video/backlight/backlight.c
/Linux-v5.15/drivers/gpu/drm/
Ddrm_panel.c164 ret = backlight_enable(panel->backlight); in drm_panel_enable()
190 ret = backlight_disable(panel->backlight); in drm_panel_disable()
331 struct backlight_device *backlight; in drm_panel_of_backlight() local
336 backlight = devm_of_find_backlight(panel->dev); in drm_panel_of_backlight()
338 if (IS_ERR(backlight)) in drm_panel_of_backlight()
339 return PTR_ERR(backlight); in drm_panel_of_backlight()
341 panel->backlight = backlight; in drm_panel_of_backlight()
/Linux-v5.15/arch/arm64/boot/dts/rockchip/
Dpx30-engicam-edimm2.2.dtsi10 backlight: backlight { label
11 compatible = "pwm-backlight";
17 backlight = <&backlight>;
Dpx30-engicam-px30-core-ctouch2-of10.dts18 backlight: backlight { label
19 compatible = "pwm-backlight";
29 backlight = <&backlight>;
/Linux-v5.15/arch/arm/boot/dts/
Dat91sam9x5dm.dtsi12 backlight: backlight { label
13 compatible = "pwm-backlight";
23 regulator-name = "backlight-power-supply";
31 backlight = <&backlight>;
/Linux-v5.15/Documentation/firmware-guide/acpi/
Dvideo_extension.rst14 The ACPI video driver does 3 things regarding backlight control.
16 Export a sysfs interface for user space to control backlight level
20 command line is not present, the driver will register a backlight device
21 and set the required backlight operation structure for it for the sysfs
23 directory named acpi_videoX under /sys/class/backlight.
25 The backlight sysfs interface has a standard definition here:
26 Documentation/ABI/stable/sysfs-class-backlight.
42 Note that ACPI video backlight driver will always use index for
108 Once user space tool receives this event, it can modify the backlight
111 Change backlight level in the kernel
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