268 lines
6.4 KiB
C
268 lines
6.4 KiB
C
/*
|
|
* PWM vibrator driver
|
|
*
|
|
* Copyright (C) 2017 Collabora Ltd.
|
|
*
|
|
* Based on previous work from:
|
|
* Copyright (C) 2012 Dmitry Torokhov <dmitry.torokhov@gmail.com>
|
|
*
|
|
* Based on PWM beeper driver:
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/input.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/property.h>
|
|
#include <linux/pwm.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct pwm_vibrator {
|
|
struct input_dev *input;
|
|
struct pwm_device *pwm;
|
|
struct pwm_device *pwm_dir;
|
|
struct regulator *vcc;
|
|
|
|
struct work_struct play_work;
|
|
u16 level;
|
|
u32 direction_duty_cycle;
|
|
};
|
|
|
|
static int pwm_vibrator_start(struct pwm_vibrator *vibrator)
|
|
{
|
|
struct device *pdev = vibrator->input->dev.parent;
|
|
struct pwm_state state;
|
|
int err;
|
|
|
|
err = regulator_enable(vibrator->vcc);
|
|
if (err) {
|
|
dev_err(pdev, "failed to enable regulator: %d", err);
|
|
return err;
|
|
}
|
|
|
|
pwm_get_state(vibrator->pwm, &state);
|
|
pwm_set_relative_duty_cycle(&state, vibrator->level, 0xffff);
|
|
state.enabled = true;
|
|
|
|
err = pwm_apply_state(vibrator->pwm, &state);
|
|
if (err) {
|
|
dev_err(pdev, "failed to apply pwm state: %d", err);
|
|
return err;
|
|
}
|
|
|
|
if (vibrator->pwm_dir) {
|
|
pwm_get_state(vibrator->pwm_dir, &state);
|
|
state.duty_cycle = vibrator->direction_duty_cycle;
|
|
state.enabled = true;
|
|
|
|
err = pwm_apply_state(vibrator->pwm_dir, &state);
|
|
if (err) {
|
|
dev_err(pdev, "failed to apply dir-pwm state: %d", err);
|
|
pwm_disable(vibrator->pwm);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pwm_vibrator_stop(struct pwm_vibrator *vibrator)
|
|
{
|
|
regulator_disable(vibrator->vcc);
|
|
|
|
if (vibrator->pwm_dir)
|
|
pwm_disable(vibrator->pwm_dir);
|
|
pwm_disable(vibrator->pwm);
|
|
}
|
|
|
|
static void pwm_vibrator_play_work(struct work_struct *work)
|
|
{
|
|
struct pwm_vibrator *vibrator = container_of(work,
|
|
struct pwm_vibrator, play_work);
|
|
|
|
if (vibrator->level)
|
|
pwm_vibrator_start(vibrator);
|
|
else
|
|
pwm_vibrator_stop(vibrator);
|
|
}
|
|
|
|
static int pwm_vibrator_play_effect(struct input_dev *dev, void *data,
|
|
struct ff_effect *effect)
|
|
{
|
|
struct pwm_vibrator *vibrator = input_get_drvdata(dev);
|
|
|
|
vibrator->level = effect->u.rumble.strong_magnitude;
|
|
if (!vibrator->level)
|
|
vibrator->level = effect->u.rumble.weak_magnitude;
|
|
|
|
schedule_work(&vibrator->play_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pwm_vibrator_close(struct input_dev *input)
|
|
{
|
|
struct pwm_vibrator *vibrator = input_get_drvdata(input);
|
|
|
|
cancel_work_sync(&vibrator->play_work);
|
|
pwm_vibrator_stop(vibrator);
|
|
}
|
|
|
|
static int pwm_vibrator_probe(struct platform_device *pdev)
|
|
{
|
|
struct pwm_vibrator *vibrator;
|
|
struct pwm_state state;
|
|
int err;
|
|
|
|
vibrator = devm_kzalloc(&pdev->dev, sizeof(*vibrator), GFP_KERNEL);
|
|
if (!vibrator)
|
|
return -ENOMEM;
|
|
|
|
vibrator->input = devm_input_allocate_device(&pdev->dev);
|
|
if (!vibrator->input)
|
|
return -ENOMEM;
|
|
|
|
vibrator->vcc = devm_regulator_get(&pdev->dev, "vcc");
|
|
err = PTR_ERR_OR_ZERO(vibrator->vcc);
|
|
if (err) {
|
|
if (err != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev, "Failed to request regulator: %d",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
vibrator->pwm = devm_pwm_get(&pdev->dev, "enable");
|
|
err = PTR_ERR_OR_ZERO(vibrator->pwm);
|
|
if (err) {
|
|
if (err != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev, "Failed to request main pwm: %d",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
INIT_WORK(&vibrator->play_work, pwm_vibrator_play_work);
|
|
|
|
/* Sync up PWM state and ensure it is off. */
|
|
pwm_init_state(vibrator->pwm, &state);
|
|
state.enabled = false;
|
|
err = pwm_apply_state(vibrator->pwm, &state);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
vibrator->pwm_dir = devm_pwm_get(&pdev->dev, "direction");
|
|
err = PTR_ERR_OR_ZERO(vibrator->pwm_dir);
|
|
switch (err) {
|
|
case 0:
|
|
/* Sync up PWM state and ensure it is off. */
|
|
pwm_init_state(vibrator->pwm_dir, &state);
|
|
state.enabled = false;
|
|
err = pwm_apply_state(vibrator->pwm_dir, &state);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to apply initial PWM state: %d",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
vibrator->direction_duty_cycle =
|
|
pwm_get_period(vibrator->pwm_dir) / 2;
|
|
device_property_read_u32(&pdev->dev, "direction-duty-cycle-ns",
|
|
&vibrator->direction_duty_cycle);
|
|
break;
|
|
|
|
case -ENODATA:
|
|
/* Direction PWM is optional */
|
|
vibrator->pwm_dir = NULL;
|
|
break;
|
|
|
|
default:
|
|
dev_err(&pdev->dev, "Failed to request direction pwm: %d", err);
|
|
/* Fall through */
|
|
|
|
case -EPROBE_DEFER:
|
|
return err;
|
|
}
|
|
|
|
vibrator->input->name = "pwm-vibrator";
|
|
vibrator->input->id.bustype = BUS_HOST;
|
|
vibrator->input->dev.parent = &pdev->dev;
|
|
vibrator->input->close = pwm_vibrator_close;
|
|
|
|
input_set_drvdata(vibrator->input, vibrator);
|
|
input_set_capability(vibrator->input, EV_FF, FF_RUMBLE);
|
|
|
|
err = input_ff_create_memless(vibrator->input, NULL,
|
|
pwm_vibrator_play_effect);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Couldn't create FF dev: %d", err);
|
|
return err;
|
|
}
|
|
|
|
err = input_register_device(vibrator->input);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Couldn't register input dev: %d", err);
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, vibrator);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused pwm_vibrator_suspend(struct device *dev)
|
|
{
|
|
struct pwm_vibrator *vibrator = dev_get_drvdata(dev);
|
|
|
|
cancel_work_sync(&vibrator->play_work);
|
|
if (vibrator->level)
|
|
pwm_vibrator_stop(vibrator);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused pwm_vibrator_resume(struct device *dev)
|
|
{
|
|
struct pwm_vibrator *vibrator = dev_get_drvdata(dev);
|
|
|
|
if (vibrator->level)
|
|
pwm_vibrator_start(vibrator);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(pwm_vibrator_pm_ops,
|
|
pwm_vibrator_suspend, pwm_vibrator_resume);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id pwm_vibra_dt_match_table[] = {
|
|
{ .compatible = "pwm-vibrator" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pwm_vibra_dt_match_table);
|
|
#endif
|
|
|
|
static struct platform_driver pwm_vibrator_driver = {
|
|
.probe = pwm_vibrator_probe,
|
|
.driver = {
|
|
.name = "pwm-vibrator",
|
|
.pm = &pwm_vibrator_pm_ops,
|
|
.of_match_table = of_match_ptr(pwm_vibra_dt_match_table),
|
|
},
|
|
};
|
|
module_platform_driver(pwm_vibrator_driver);
|
|
|
|
MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
|
|
MODULE_DESCRIPTION("PWM vibrator driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pwm-vibrator");
|