98 lines
4.0 KiB
Plaintext
98 lines
4.0 KiB
Plaintext
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QPNP Haptic
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QPNP (Qualcomm Technologies Plug N Play) Haptic is a peripheral on
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Qualcomm Technologies PMICs. The PMIC is connected to Host processor
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via SPMI bus.
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This device can be operated in four modes - direct, buffer,
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pwm(pulse width modulation) and audio.
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Required Properties:
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- compatible: must be "qcom,qpnp-haptic"
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- reg: address of device
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- qcom,actuator-type: must be one of "erm" or "lra"
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- qcom,play-mode : must be one of "buffer", "direct", "pwm" or "audio"
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Optional Properties:
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- qcom,timeout-ms: timeout in ms.
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- qcom,vmax-mv : maximum output voltage in milli volts
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- qcom,ilim-ma : maximum output current limit threshold in milli amps
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- qcom,int-pwm-freq-khz : frequency for internal pwm
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- qcom,en-brake : specify to enable internal reverse braking
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- qcom,brake-pattern : 4 byte active brake pattern. Each pattern represents
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2-bit amplitude control 0x00: 0, 0x01: vmax/4, 0x02: vmax/2,
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0x03: vmax. Default values are 0x00.
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- qcom,sc-deb-cycles : short circuit debounce in internal pwm switching clock cycles
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- qcom,use-play-irq : boolean, use this if the device uses irq for play
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- qcom,use-sc-irq : boolean, use this if the device uses irq for play
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- interrupts: Specifies the interrupt associated with Haptics. The available
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interrupts are play and short circuit. The values for play and
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short circuit are <0x3 0xc0 0x0> and <0x3 0xc0 0x1>.
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- interrupt-names: Specify the interrupt names associated with interrupts. Must be
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one of "play-irq" or "sc-irq"
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- vcc_pon-supply: power-on driver regulator
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Optional properties for buffer play mode:
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- qcom,wave-samples : 8 byte buffer representing the wave. The bits in each sample
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are represented as follows- bit 0: reserved, bits 1 to 5: amplitude
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of the waveform, bit 6: over drive and bit 7: direction.
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- qcom,wave-shape : must be "sine" or "square"
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- qcom,wave-rep-cnt : repetition count for wave form
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- qcom,wave-samp-rep-cnt : repetition count for each sample of wave
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- qcom,wave-play-rate-us : duration at which each sample to be played in micro seconds
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Required properties for pwm play mode:
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- qcom,pwm-channel: pwm channel the led will operate on
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- qcom,period-us: pwm period in us
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- qcom,duty-us: pwm duty cycle in us
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- qcom,ext-pwm-dtest-line: dtest line to used with pwm
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Optional properties for pwm play mode:
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- qcom,ext-pwm-freq-khz : frequency for external pwm in kilo HZ
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Optional properties when qcom,actuator-type is "lra"
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- qcom,correct-lra-drive-freq : boolean, use this to ensure LRA is driven at correct resonant
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frequency, which may change due to operating conditions.
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- qcom,misc-trim-error-rc19p2-clk-reg-present : boolean, use this if TRIM_ERROR_RC19P2_CLK
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register is present in MISC module. This register holds
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the frequency error in 19.2Mhz RC clock.
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- qcom,lra-auto-res-mode : auto resonance technique, four different modes
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"none" : no auto resonance
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"zxd" : zero crossing based discontinuous method
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"qwd" : quarter wave drive method
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"max-qwd" : Maximum QWD
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"zxd-eop" : ZXD + End of pattern (This is the Default)
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- qcom,lra-high-z : High Z configuration for auto resonance. Possible string values are
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"none", "opt1", "opt2" and "opt3" (default)
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- qcom,lra-res-cal-period : Auto resonance calibration period. The values range from
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4 to 32(default)
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Example:
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qcom,haptic@c000 {
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status = "disabled";
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compatible = "qcom,qpnp-haptic";
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reg = <0xc000 0x100>;
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interrupts = <0x3 0xc0 0x0>,
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<0x3 0xc0 0x1>;
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interrupt-names = "sc-irq", "play-irq";
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vcc_pon-supply = <&pon_perph_reg>;
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qcom,play-mode = "direct";
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qcom,wave-play-rate-us = <5263>;
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qcom,actuator-type = "lra";
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qcom,wave-shape = "square";
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qcom,vmax-mv = <2000>;
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qcom,ilim-ma = <800>;
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qcom,sc-deb-cycles = <8>;
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qcom,int-pwm-freq-khz = <505>;
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qcom,en-brake;
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qcom,brake-pattern = [03 03 00 00];
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qcom,use-play-irq;
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qcom,use-sc-irq;
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qcom,wave-samples = [3e 3e 3e 3e 3e 3e 3e 3e];
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qcom,wave-rep-cnt = <1>;
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qcom,wave-samp-rep-cnt = <1>;
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qcom,lra-high-z = "opt1";
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qcom,lra-auto-res-mode = "qwd";
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qcom,lra-res-cal-period = <4>;
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};
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