cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gpio-beeper.c (2656B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Generic GPIO beeper driver
      4 *
      5 * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
      6 */
      7
      8#include <linux/input.h>
      9#include <linux/module.h>
     10#include <linux/gpio/consumer.h>
     11#include <linux/of.h>
     12#include <linux/workqueue.h>
     13#include <linux/platform_device.h>
     14
     15#define BEEPER_MODNAME		"gpio-beeper"
     16
     17struct gpio_beeper {
     18	struct work_struct	work;
     19	struct gpio_desc	*desc;
     20	bool			beeping;
     21};
     22
     23static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
     24{
     25	gpiod_set_value_cansleep(beep->desc, on);
     26}
     27
     28static void gpio_beeper_work(struct work_struct *work)
     29{
     30	struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
     31
     32	gpio_beeper_toggle(beep, beep->beeping);
     33}
     34
     35static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
     36			     unsigned int code, int value)
     37{
     38	struct gpio_beeper *beep = input_get_drvdata(dev);
     39
     40	if (type != EV_SND || code != SND_BELL)
     41		return -ENOTSUPP;
     42
     43	if (value < 0)
     44		return -EINVAL;
     45
     46	beep->beeping = value;
     47	/* Schedule work to actually turn the beeper on or off */
     48	schedule_work(&beep->work);
     49
     50	return 0;
     51}
     52
     53static void gpio_beeper_close(struct input_dev *input)
     54{
     55	struct gpio_beeper *beep = input_get_drvdata(input);
     56
     57	cancel_work_sync(&beep->work);
     58	gpio_beeper_toggle(beep, false);
     59}
     60
     61static int gpio_beeper_probe(struct platform_device *pdev)
     62{
     63	struct gpio_beeper *beep;
     64	struct input_dev *input;
     65
     66	beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
     67	if (!beep)
     68		return -ENOMEM;
     69
     70	beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
     71	if (IS_ERR(beep->desc))
     72		return PTR_ERR(beep->desc);
     73
     74	input = devm_input_allocate_device(&pdev->dev);
     75	if (!input)
     76		return -ENOMEM;
     77
     78	INIT_WORK(&beep->work, gpio_beeper_work);
     79
     80	input->name		= pdev->name;
     81	input->id.bustype	= BUS_HOST;
     82	input->id.vendor	= 0x0001;
     83	input->id.product	= 0x0001;
     84	input->id.version	= 0x0100;
     85	input->close		= gpio_beeper_close;
     86	input->event		= gpio_beeper_event;
     87
     88	input_set_capability(input, EV_SND, SND_BELL);
     89
     90	input_set_drvdata(input, beep);
     91
     92	return input_register_device(input);
     93}
     94
     95#ifdef CONFIG_OF
     96static const struct of_device_id gpio_beeper_of_match[] = {
     97	{ .compatible = BEEPER_MODNAME, },
     98	{ }
     99};
    100MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
    101#endif
    102
    103static struct platform_driver gpio_beeper_platform_driver = {
    104	.driver	= {
    105		.name		= BEEPER_MODNAME,
    106		.of_match_table	= of_match_ptr(gpio_beeper_of_match),
    107	},
    108	.probe	= gpio_beeper_probe,
    109};
    110module_platform_driver(gpio_beeper_platform_driver);
    111
    112MODULE_LICENSE("GPL");
    113MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
    114MODULE_DESCRIPTION("Generic GPIO beeper driver");