271 lines
6.3 KiB
C
271 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#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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bool vcc_on;
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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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if (!vibrator->vcc_on) {
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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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vibrator->vcc_on = true;
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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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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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if (vibrator->vcc_on) {
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regulator_disable(vibrator->vcc);
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vibrator->vcc_on = false;
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}
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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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fallthrough;
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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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