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Input: add a driver for PWM controllable vibrators
Provide a simple driver for PWM controllable vibrators. It will be used by Motorola Droid 4. Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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66
Documentation/devicetree/bindings/input/pwm-vibrator.txt
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66
Documentation/devicetree/bindings/input/pwm-vibrator.txt
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@ -0,0 +1,66 @@
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* PWM vibrator device tree bindings
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Registers a PWM device as vibrator. It is expected, that the vibrator's
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strength increases based on the duty cycle of the enable PWM channel
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(100% duty cycle meaning strongest vibration, 0% meaning no vibration).
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The binding supports an optional direction PWM channel, that can be
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driven at fixed duty cycle. If available this is can be used to increase
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the vibration effect of some devices.
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Required properties:
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- compatible: should contain "pwm-vibrator"
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- pwm-names: Should contain "enable" and optionally "direction"
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- pwms: Should contain a PWM handle for each entry in pwm-names
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Optional properties:
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- vcc-supply: Phandle for the regulator supplying power
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- direction-duty-cycle-ns: Duty cycle of the direction PWM channel in
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nanoseconds, defaults to 50% of the channel's
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period.
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Example from Motorola Droid 4:
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&omap4_pmx_core {
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vibrator_direction_pin: pinmux_vibrator_direction_pin {
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pinctrl-single,pins = <
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OMAP4_IOPAD(0x1ce, PIN_OUTPUT | MUX_MODE1) /* dmtimer8_pwm_evt (gpio_27) */
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>;
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};
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vibrator_enable_pin: pinmux_vibrator_enable_pin {
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pinctrl-single,pins = <
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OMAP4_IOPAD(0X1d0, PIN_OUTPUT | MUX_MODE1) /* dmtimer9_pwm_evt (gpio_28) */
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>;
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};
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};
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/ {
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pwm8: dmtimer-pwm {
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pinctrl-names = "default";
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pinctrl-0 = <&vibrator_direction_pin>;
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compatible = "ti,omap-dmtimer-pwm";
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#pwm-cells = <3>;
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ti,timers = <&timer8>;
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ti,clock-source = <0x01>;
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};
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pwm9: dmtimer-pwm {
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pinctrl-names = "default";
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pinctrl-0 = <&vibrator_enable_pin>;
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compatible = "ti,omap-dmtimer-pwm";
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#pwm-cells = <3>;
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ti,timers = <&timer9>;
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ti,clock-source = <0x01>;
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};
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vibrator {
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compatible = "pwm-vibrator";
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pwms = <&pwm8 0 1000000000 0>,
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<&pwm9 0 1000000000 0>;
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pwm-names = "enable", "direction";
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direction-duty-cycle-ns = <1000000000>;
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};
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};
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@ -581,6 +581,18 @@ config INPUT_PWM_BEEPER
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To compile this driver as a module, choose M here: the module will be
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called pwm-beeper.
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config INPUT_PWM_VIBRA
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tristate "PWM vibrator support"
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depends on PWM
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select INPUT_FF_MEMLESS
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help
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Say Y here to get support for PWM based vibrator devices.
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If unsure, say N.
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To compile this driver as a module, choose M here: the module will be
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called pwm-vibra.
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config INPUT_RK805_PWRKEY
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tristate "Rockchip RK805 PMIC power key support"
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depends on MFD_RK808
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@ -59,6 +59,7 @@ obj-$(CONFIG_INPUT_PM8XXX_VIBRATOR) += pm8xxx-vibrator.o
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obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
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obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
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obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o
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obj-$(CONFIG_INPUT_PWM_VIBRA) += pwm-vibra.o
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obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o
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obj-$(CONFIG_INPUT_REGULATOR_HAPTIC) += regulator-haptic.o
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obj-$(CONFIG_INPUT_RETU_PWRBUTTON) += retu-pwrbutton.o
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267
drivers/input/misc/pwm-vibra.c
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267
drivers/input/misc/pwm-vibra.c
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/*
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* PWM vibrator driver
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*
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* Copyright (C) 2017 Collabora Ltd.
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*
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* Based on previous work from:
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* Copyright (C) 2012 Dmitry Torokhov <dmitry.torokhov@gmail.com>
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*
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* Based on PWM beeper driver:
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/pwm.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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struct pwm_vibrator {
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struct input_dev *input;
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struct pwm_device *pwm;
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struct pwm_device *pwm_dir;
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struct regulator *vcc;
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struct work_struct play_work;
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u16 level;
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u32 direction_duty_cycle;
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};
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static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
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{
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struct device *pdev = vibrator->input->dev.parent;
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struct pwm_state state;
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int err;
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err = regulator_enable(vibrator->vcc);
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if (err) {
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dev_err(pdev, "failed to enable regulator: %d", err);
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return err;
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}
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pwm_get_state(vibrator->pwm, &state);
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pwm_set_relative_duty_cycle(&state, vibrator->level, 0xffff);
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state.enabled = true;
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err = pwm_apply_state(vibrator->pwm, &state);
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if (err) {
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dev_err(pdev, "failed to apply pwm state: %d", err);
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return err;
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}
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if (vibrator->pwm_dir) {
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pwm_get_state(vibrator->pwm_dir, &state);
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state.duty_cycle = vibrator->direction_duty_cycle;
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state.enabled = true;
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err = pwm_apply_state(vibrator->pwm_dir, &state);
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if (err) {
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dev_err(pdev, "failed to apply dir-pwm state: %d", err);
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pwm_disable(vibrator->pwm);
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return err;
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}
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}
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return 0;
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}
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static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
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{
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regulator_disable(vibrator->vcc);
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if (vibrator->pwm_dir)
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pwm_disable(vibrator->pwm_dir);
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pwm_disable(vibrator->pwm);
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}
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static void pwm_vibrator_play_work(struct work_struct *work)
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{
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struct pwm_vibrator *vibrator = container_of(work,
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struct pwm_vibrator, play_work);
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if (vibrator->level)
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pwm_vibrator_start(vibrator);
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else
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pwm_vibrator_stop(vibrator);
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}
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static int pwm_vibrator_play_effect(struct input_dev *dev, void *data,
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struct ff_effect *effect)
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{
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struct pwm_vibrator *vibrator = input_get_drvdata(dev);
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vibrator->level = effect->u.rumble.strong_magnitude;
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if (!vibrator->level)
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vibrator->level = effect->u.rumble.weak_magnitude;
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schedule_work(&vibrator->play_work);
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return 0;
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}
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static void pwm_vibrator_close(struct input_dev *input)
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{
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struct pwm_vibrator *vibrator = input_get_drvdata(input);
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cancel_work_sync(&vibrator->play_work);
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pwm_vibrator_stop(vibrator);
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}
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static int pwm_vibrator_probe(struct platform_device *pdev)
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{
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struct pwm_vibrator *vibrator;
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struct pwm_state state;
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int err;
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vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL);
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if (!vibrator)
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return -ENOMEM;
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vibrator->input = devm_input_allocate_device(&pdev->dev);
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if (!vibrator->input)
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return -ENOMEM;
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vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc");
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err = PTR_ERR_OR_ZERO(vibrator->vcc);
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if (err) {
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if (err != -EPROBE_DEFER)
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dev_err(&pdev->dev, "Failed to request regulator: %d",
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err);
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return err;
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}
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vibrator->pwm = devm_pwm_get(&pdev->dev, "enable");
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err = PTR_ERR_OR_ZERO(vibrator->pwm);
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if (err) {
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if (err != -EPROBE_DEFER)
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dev_err(&pdev->dev, "Failed to request main pwm: %d",
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err);
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return err;
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}
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INIT_WORK(&vibrator->play_work, pwm_vibrator_play_work);
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/* Sync up PWM state and ensure it is off. */
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pwm_init_state(vibrator->pwm, &state);
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state.enabled = false;
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err = pwm_apply_state(vibrator->pwm, &state);
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if (err) {
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dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
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err);
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return err;
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}
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vibrator->pwm_dir = devm_pwm_get(&pdev->dev, "direction");
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err = PTR_ERR_OR_ZERO(vibrator->pwm_dir);
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switch (err) {
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case 0:
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/* Sync up PWM state and ensure it is off. */
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pwm_init_state(vibrator->pwm_dir, &state);
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state.enabled = false;
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err = pwm_apply_state(vibrator->pwm_dir, &state);
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if (err) {
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dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
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err);
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return err;
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}
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vibrator->direction_duty_cycle =
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pwm_get_period(vibrator->pwm_dir) / 2;
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device_property_read_u32(&pdev->dev, "direction-duty-cycle-ns",
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&vibrator->direction_duty_cycle);
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break;
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case -ENODATA:
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/* Direction PWM is optional */
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vibrator->pwm_dir = NULL;
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break;
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default:
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dev_err(&pdev->dev, "Failed to request direction pwm: %d", err);
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/* Fall through */
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case -EPROBE_DEFER:
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return err;
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}
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vibrator->input->name = "pwm-vibrator";
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vibrator->input->id.bustype = BUS_HOST;
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vibrator->input->dev.parent = &pdev->dev;
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vibrator->input->close = pwm_vibrator_close;
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input_set_drvdata(vibrator->input, vibrator);
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input_set_capability(vibrator->input, EV_FF, FF_RUMBLE);
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err = input_ff_create_memless(vibrator->input, NULL,
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pwm_vibrator_play_effect);
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if (err) {
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dev_err(&pdev->dev, "Couldn't create FF dev: %d", err);
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return err;
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}
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err = input_register_device(vibrator->input);
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if (err) {
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dev_err(&pdev->dev, "Couldn't register input dev: %d", err);
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return err;
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}
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platform_set_drvdata(pdev, vibrator);
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return 0;
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}
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static int __maybe_unused pwm_vibrator_suspend(struct device *dev)
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{
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struct pwm_vibrator *vibrator = dev_get_drvdata(dev);
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cancel_work_sync(&vibrator->play_work);
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if (vibrator->level)
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pwm_vibrator_stop(vibrator);
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return 0;
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}
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static int __maybe_unused pwm_vibrator_resume(struct device *dev)
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{
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struct pwm_vibrator *vibrator = dev_get_drvdata(dev);
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if (vibrator->level)
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pwm_vibrator_start(vibrator);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(pwm_vibrator_pm_ops,
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pwm_vibrator_suspend, pwm_vibrator_resume);
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#ifdef CONFIG_OF
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static const struct of_device_id pwm_vibra_dt_match_table[] = {
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{ .compatible = "pwm-vibrator" },
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{},
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};
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MODULE_DEVICE_TABLE(of, pwm_vibra_dt_match_table);
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#endif
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static struct platform_driver pwm_vibrator_driver = {
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.probe = pwm_vibrator_probe,
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.driver = {
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.name = "pwm-vibrator",
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.pm = &pwm_vibrator_pm_ops,
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.of_match_table = of_match_ptr(pwm_vibra_dt_match_table),
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},
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};
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module_platform_driver(pwm_vibrator_driver);
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MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
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MODULE_DESCRIPTION("PWM vibrator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pwm-vibrator");
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