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207 lines
4.9 KiB
207 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* GPIO vibrator driver |
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* |
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* Copyright (C) 2019 Luca Weiss <[email protected]> |
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* |
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* Based on PWM vibrator driver: |
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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 <[email protected]> |
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* |
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* Based on PWM beeper driver: |
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* Copyright (C) 2010, Lars-Peter Clausen <[email protected]> |
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*/ |
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#include <linux/gpio/consumer.h> |
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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/regulator/consumer.h> |
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#include <linux/slab.h> |
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struct gpio_vibrator { |
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struct input_dev *input; |
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struct gpio_desc *gpio; |
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struct regulator *vcc; |
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struct work_struct play_work; |
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bool running; |
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bool vcc_on; |
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}; |
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static int gpio_vibrator_start(struct gpio_vibrator *vibrator) |
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{ |
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struct device *pdev = vibrator->input->dev.parent; |
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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\n", 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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gpiod_set_value_cansleep(vibrator->gpio, 1); |
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return 0; |
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} |
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static void gpio_vibrator_stop(struct gpio_vibrator *vibrator) |
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{ |
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gpiod_set_value_cansleep(vibrator->gpio, 0); |
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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 gpio_vibrator_play_work(struct work_struct *work) |
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{ |
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struct gpio_vibrator *vibrator = |
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container_of(work, struct gpio_vibrator, play_work); |
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if (vibrator->running) |
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gpio_vibrator_start(vibrator); |
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else |
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gpio_vibrator_stop(vibrator); |
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} |
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static int gpio_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 gpio_vibrator *vibrator = input_get_drvdata(dev); |
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int level; |
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level = effect->u.rumble.strong_magnitude; |
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if (!level) |
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level = effect->u.rumble.weak_magnitude; |
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vibrator->running = level; |
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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 gpio_vibrator_close(struct input_dev *input) |
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{ |
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struct gpio_vibrator *vibrator = input_get_drvdata(input); |
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cancel_work_sync(&vibrator->play_work); |
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gpio_vibrator_stop(vibrator); |
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vibrator->running = false; |
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} |
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static int gpio_vibrator_probe(struct platform_device *pdev) |
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{ |
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struct gpio_vibrator *vibrator; |
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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\n", |
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err); |
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return err; |
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} |
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vibrator->gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); |
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err = PTR_ERR_OR_ZERO(vibrator->gpio); |
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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 gpio: %d\n", |
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err); |
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return err; |
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} |
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INIT_WORK(&vibrator->play_work, gpio_vibrator_play_work); |
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vibrator->input->name = "gpio-vibrator"; |
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vibrator->input->id.bustype = BUS_HOST; |
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vibrator->input->close = gpio_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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gpio_vibrator_play_effect); |
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if (err) { |
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dev_err(&pdev->dev, "Couldn't create FF dev: %d\n", 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\n", 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 gpio_vibrator_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct gpio_vibrator *vibrator = platform_get_drvdata(pdev); |
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cancel_work_sync(&vibrator->play_work); |
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if (vibrator->running) |
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gpio_vibrator_stop(vibrator); |
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return 0; |
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} |
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static int __maybe_unused gpio_vibrator_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct gpio_vibrator *vibrator = platform_get_drvdata(pdev); |
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if (vibrator->running) |
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gpio_vibrator_start(vibrator); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(gpio_vibrator_pm_ops, |
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gpio_vibrator_suspend, gpio_vibrator_resume); |
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#ifdef CONFIG_OF |
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static const struct of_device_id gpio_vibra_dt_match_table[] = { |
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{ .compatible = "gpio-vibrator" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, gpio_vibra_dt_match_table); |
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#endif |
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static struct platform_driver gpio_vibrator_driver = { |
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.probe = gpio_vibrator_probe, |
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.driver = { |
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.name = "gpio-vibrator", |
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.pm = &gpio_vibrator_pm_ops, |
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.of_match_table = of_match_ptr(gpio_vibra_dt_match_table), |
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}, |
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}; |
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module_platform_driver(gpio_vibrator_driver); |
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MODULE_AUTHOR("Luca Weiss <[email protected]>"); |
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MODULE_DESCRIPTION("GPIO vibrator driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:gpio-vibrator");
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