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// SPDX-License-Identifier: GPL-2.0+
/*
* GPIO vibrator driver
*
* Copyright (C) 2019 Luca Weiss <luca@z3ntu.xyz>
*
* Based on 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>
*/
#include <linux/gpio/consumer.h>
#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/regulator/consumer.h>
#include <linux/slab.h>
struct gpio_vibrator {
struct input_dev *input;
struct gpio_desc *gpio;
struct regulator *vcc;
struct work_struct play_work;
bool running;
bool vcc_on;
};
static int gpio_vibrator_start(struct gpio_vibrator *vibrator)
{
struct device *pdev = vibrator->input->dev.parent;
int err;
if (!vibrator->vcc_on) {
err = regulator_enable(vibrator->vcc);
if (err) {
dev_err(pdev, "failed to enable regulator: %d\n", err);
return err;
}
vibrator->vcc_on = true;
}
gpiod_set_value_cansleep(vibrator->gpio, 1);
return 0;
}
static void gpio_vibrator_stop(struct gpio_vibrator *vibrator)
{
gpiod_set_value_cansleep(vibrator->gpio, 0);
if (vibrator->vcc_on) {
regulator_disable(vibrator->vcc);
vibrator->vcc_on = false;
}
}
static void gpio_vibrator_play_work(struct work_struct *work)
{
struct gpio_vibrator *vibrator =
container_of(work, struct gpio_vibrator, play_work);
if (vibrator->running)
gpio_vibrator_start(vibrator);
else
gpio_vibrator_stop(vibrator);
}
static int gpio_vibrator_play_effect(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct gpio_vibrator *vibrator = input_get_drvdata(dev);
int level;
level = effect->u.rumble.strong_magnitude;
if (!level)
level = effect->u.rumble.weak_magnitude;
vibrator->running = level;
schedule_work(&vibrator->play_work);
return 0;
}
static void gpio_vibrator_close(struct input_dev *input)
{
struct gpio_vibrator *vibrator = input_get_drvdata(input);
cancel_work_sync(&vibrator->play_work);
gpio_vibrator_stop(vibrator);
vibrator->running = false;
}
static int gpio_vibrator_probe(struct platform_device *pdev)
{
struct gpio_vibrator *vibrator;
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\n",
err);
return err;
}
vibrator->gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
err = PTR_ERR_OR_ZERO(vibrator->gpio);
if (err) {
if (err != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to request main gpio: %d\n",
err);
return err;
}
INIT_WORK(&vibrator->play_work, gpio_vibrator_play_work);
vibrator->input->name = "gpio-vibrator";
vibrator->input->id.bustype = BUS_HOST;
vibrator->input->close = gpio_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,
gpio_vibrator_play_effect);
if (err) {
dev_err(&pdev->dev, "Couldn't create FF dev: %d\n", err);
return err;
}
err = input_register_device(vibrator->input);
if (err) {
dev_err(&pdev->dev, "Couldn't register input dev: %d\n", err);
return err;
}
platform_set_drvdata(pdev, vibrator);
return 0;
}
static int __maybe_unused gpio_vibrator_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_vibrator *vibrator = platform_get_drvdata(pdev);
cancel_work_sync(&vibrator->play_work);
if (vibrator->running)
gpio_vibrator_stop(vibrator);
return 0;
}
static int __maybe_unused gpio_vibrator_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_vibrator *vibrator = platform_get_drvdata(pdev);
if (vibrator->running)
gpio_vibrator_start(vibrator);
return 0;
}
static SIMPLE_DEV_PM_OPS(gpio_vibrator_pm_ops,
gpio_vibrator_suspend, gpio_vibrator_resume);
#ifdef CONFIG_OF
static const struct of_device_id gpio_vibra_dt_match_table[] = {
{ .compatible = "gpio-vibrator" },
{}
};
MODULE_DEVICE_TABLE(of, gpio_vibra_dt_match_table);
#endif
static struct platform_driver gpio_vibrator_driver = {
.probe = gpio_vibrator_probe,
.driver = {
.name = "gpio-vibrator",
.pm = &gpio_vibrator_pm_ops,
.of_match_table = of_match_ptr(gpio_vibra_dt_match_table),
},
};
module_platform_driver(gpio_vibrator_driver);
MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xy>");
MODULE_DESCRIPTION("GPIO vibrator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio-vibrator");
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