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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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/* 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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