271 lines
8.9 KiB
Plaintext
271 lines
8.9 KiB
Plaintext
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Qualcomm QPNP Leds
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QPNP (Qualcomm Plug N Play) LEDs driver is used for
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controlling LEDs that are part of PMIC on Qualcomm reference
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platforms. The PMIC is connected to Host processor via
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SPMI bus. This driver supports various LED modules such as
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Keypad backlight, WLED (white LED), RGB LED and flash LED.
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Each LED module is represented as a node of "leds-qpnp". This
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node will further contain the type of LED supported and its
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properties. At least one child node is required for each LED
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module. Each must have the required properties below, in addition
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to the properties for the LED type, WLED, Flash or RGB.
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Required properties for each child node, WLED, Flash and RGB:
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- compatible : should be "qcom,leds-qpnp"
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- qcom,id : must be one of values supported in enum qpnp_led
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- label : type of led that will be used, ie "wled"
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- qcom,max-current : maximum current that the LED can sustain
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- linux,name : name of the led that is used in led framework
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WLED is primarily used as display backlight. Display subsystem uses
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LED triggers for WLED to control the brightness as needed.
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Optional properties for WLED:
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- qcom,num-strings: number of wled strings supported
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- qcom,ovp-val: over voltage protection threshold,
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follows enum wled_ovp_threshold
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- qcom,boost-curr-lim: boot currnet limit, follows enum wled_current_bost_limit
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- qcom,ctrl-delay-us: delay in activation of led
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- qcom,dig-mod-gen-en: digital module generator
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- qcom,cs-out-en: current sink output enable
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- qcom,op-fdbck: selection of output as feedback for the boost, 00 = automatic selection, 01 = select LED1 output, 02 = select LED2 output, 03 = select LED3 output
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- qcom,cp-select: high pole capacitance
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- linux,default-trigger: trigger the led from external modules such as display
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- qcom,default-state: default state of the led, should be "on" or "off"
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Flash is used primarily as a camera or video flash.
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Optional properties for flash:
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- qcom,headroom: headroom to use, mV
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- qcom,duration: duration of the flash, ms
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- qcom,clamp-curr: current to clamp at, mA
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- qcom,startup-dly: delay before flashing after flash executed, us
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- qcom,saftey-timer: include for safety timer use, otherwise watchdog timer will be used
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- linux,default-trigger: trigger the led from external modules such as display
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- qcom,default-state: default state of the led, should be "on" or "off"
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- qcom,torch-enable: set flash led to torch mode
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- flash_boost-supply: SMBB regulator for LED flash mode
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RGB Led is a tri-colored led, Red, Blue & Green.
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Required properties for RGB led:
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- qcom,mode: mode the led should operate in, options "pwm" and "lpg"
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- qcom,pwm-channel: pwm channel the led will operate on
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Required properties for PWM mode only:
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- qcom,pwm-us: time the pwm device will modulate at (us)
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Required properties for LPG mode only:
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- qcom,duty-pcts: array of values for duty cycle to go through
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- qcom,start-idx: starting point duty-pcts array
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Optional properties for LPG mode only:
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- qcom,pause-lo: pause at low end of cycle
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- qcom,pause-hi: pause at high end of cycle
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- qcom,ramp-step-ms: step between each cycle (ms)
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- qcom,lut-flags: flags to be used in lut configuration
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Optional properties for RGB led:
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- linux,default-trigger: trigger the led from external modules such as display
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- qcom,default-state: default state of the led, should be "on" or "off"
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- qcom,turn-off-delay-ms: delay in millisecond for turning off the led when its default-state is "on". Value is being ignored in case default-state is "off".
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- qcom,use-blink: Use blink sysfs entry for switching into lpg mode. For optimal use, set default mode to pwm. All required lpg parameters must be supplied.
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MPP LED is an LED controled through a Multi Purpose Pin.
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Optional properties for MPP LED:
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- linux,default-trigger: trigger the led from external modules such as display
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- qcom,default-state: default state of the led, should be "on" or "off"
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- qcom,source-sel: select power source, default 1 (enabled)
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- qcom,mode-ctrl: select operation mode, default 0x60 = Mode Sink
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- qcom,mode: mode the led should operate in, options "pwm", "lpg" and "manual"
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- qcom,use-blink: Use blink sysfs entry for switching into lpg mode. For optimal use, set default mode to pwm. All required lpg parameters must be supplied.
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Required properties for PWM mode only:
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- qcom,pwm-channel: pwm channel the led will operate on
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- qcom,pwm-us: time the pwm device will modulate at (us)
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Required properties for LPG mode only:
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- qcom,pwm-channel: pwm channel the led will operate on
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- qcom,duty-pcts: array of values for duty cycle to go through
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- qcom,start-idx: starting point duty-pcts array
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Optional properties for LPG mode only:
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- qcom,pause-lo: pause at low end of cycle
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- qcom,pause-hi: pause at high end of cycle
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- qcom,ramp-step-ms: step between each cycle (ms)
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- qcom,lut-flags: flags to be used in lut configuration
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Keypad backlight is a backlight source for buttons. It supports four rows
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and the required rows are enabled by specifying values in the properties.
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Required properties for keypad backlight:
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- qcom,mode: mode the led should operate in, options "pwm" and "lpg"
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- qcom,pwm-channel: pwm channel the led will operate on
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- qcom,pwm-us: time the pwm device will modulate at (us)
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- qcom,row-src-sel-val: select source for rows. One bit is used for each row.
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Specify 0 for vph_pwr and 1 for vbst for each row.
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- qcom,row-scan-val: select rows for scanning
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- qcom,row-scan-en: row scan enable
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Required properties for PWM mode only:
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- qcom,pwm-us: time the pwm device will modulate at (us)
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Required properties for LPG mode only:
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- qcom,duty-pcts: array of values for duty cycle to go through
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- qcom,start-idx: starting point duty-pcts array
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Optional properties for LPG mode only:
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- qcom,pause-lo: pause at low end of cycle
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- qcom,pause-hi: pause at high end of cycle
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- qcom,ramp-step-ms: step between each cycle (ms)
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- qcom,lut-flags: flags to be used in lut configuration
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Example:
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qcom,leds@a200 {
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status = "okay";
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qcom,led_mpp_3 {
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label = "mpp";
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linux,name = "wled-backlight";
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linux-default-trigger = "none";
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qcom,default-state = "on";
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qcom,max-current = <40>;
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qcom,id = <6>;
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qcom,source-sel = <1>;
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qcom,mode-ctrl = <0x10>;
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};
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};
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qcom,leds@a300 {
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status = "okay";
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qcom,led_mpp_pwm {
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label = "mpp";
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linux,name = "green";
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linux,default-trigger = "none";
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qcom,default-state = "off";
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qcom,max-current = <40>;
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qcom,current-setting = <5>;
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qcom,id = <6>;
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qcom,mode = "pwm";
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qcom,source-sel = <8>;
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qcom,mode-ctrl = <0x60>;
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qcom,pwm-channel = <0>;
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qcom,pwm-us = <1000>;
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};
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};
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qcom,leds@d000 {
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status = "okay";
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qcom,rgb_pwm {
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label = "rgb";
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linux,name = "led:rgb_red";
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qcom,mode = "pwm";
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qcom,pwm-us = <1000>;
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qcom,pwm-channel = <6>;
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qcom,max-current = <12>;
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qcom,default-state = "off";
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qcom,id = <3>;
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linux,default-trigger =
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"battery-charging";
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};
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qcom,rgb_lpg {
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label = "rgb";
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linux,name = "led:rgb_green";
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qcom,mode = "lpg";
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qcom,pwm-channel = <5>;
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qcom,duty-ms = <20>;
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qcom,start-idx = <1>;
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qcom,idx-len = <10>;
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qcom,duty-pcts = [00 19 32 4B 64
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64 4B 32 19 00];
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qcom,max-current = <12>;
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qcom,default-state = "off";
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qcom,id = <3>;
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linux,default-trigger =
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"battery-charging";
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};
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qcom,rgb_blink {
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label = "rgb";
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linux,name = "led:rgb_blue";
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qcom,mode = "pwm";
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qcom,pwm-channel = <4>;
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qcom,start-idx = <1>;
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qcom,idx-len = <10>;
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qcom,duty-pcts = [00 19 32 4B 64
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64 4B 32 19 00];
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qcom,lut-flags = <3>;
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qcom,pause-lo = <0>;
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qcom,pause-hi = <0>;
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qcom,ramp-step-ms = <255>;
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qcom,max-current = <12>;
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qcom,default-state = "on";
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qcom,turn-off-delay-ms = <500>;
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qcom,id = <5>;
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linux,default-trigger = "none";
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qcom,pwm-us = <1000>;
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qcom,use-blink;
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};
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};
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qcom,leds@d300 {
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compatible = "qcom,leds-qpnp";
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status = "okay";
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flash_boost-supply = <&pm8941_chg_boost>;
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qcom,flash_0 {
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qcom,max-current = <1000>;
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qcom,default-state = "off";
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qcom,headroom = <0>;
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qcom,duration = <200>;
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qcom,clamp-curr = <200>;
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qcom,startup-dly = <1>;
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qcom,safety-timer;
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label = "flash";
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linux,default-trigger =
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"flash0_trigger";
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linux,name = "led:flash_0";
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qcom,current = <625>;
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qcom,id = <1>;
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};
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};
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qcom,leds@d800 {
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compatible = "qcom,leds-qpnp";
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status = "okay";
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qcom,wled_0 {
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linux,default-trigger = "bkl-trigger"
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label = "wled";
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qcom,cs-out-en;
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qcom,op-fdbck = <1>;
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qcom,default-state "off";
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qcom,max-current = <25>;
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qcom,ctrl-delay-us = <0>;
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qcom,boost-curr-lim = <3>;
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qcom,cp-sel = <0>;
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qcom,switch-freq = <2>;
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qcom,ovp-val = <2>;
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qcom,num-strings = <1>;
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qcom,id = <0>;
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linux,name = "led:wled_backlight";
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};
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};
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qcom,leds@e200 {
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status = "okay";
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qcom,kpdbl {
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label = "kpdbl";
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linux,name = "button-backlight";
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qcom,mode = <0>;
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qcom,pwm-channel = <8>;
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qcom,pwm-us = <1000>;
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qcom,id = <7>;
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qcom,max-current = <20>;
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qcom,row-src-sel-val = <0x00>;
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qcom,row-scan-en = <0x01>;
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qcom,row-scan-val = <0x01>;
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};
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};
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