| // 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 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 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 DEFINE_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 = pm_sleep_ptr(&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"); |