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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");
1/*
2 * Generic GPIO beeper driver
3 *
4 * Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/input.h>
13#include <linux/module.h>
14#include <linux/of_gpio.h>
15#include <linux/workqueue.h>
16#include <linux/platform_device.h>
17
18#define BEEPER_MODNAME "gpio-beeper"
19
20struct gpio_beeper {
21 struct work_struct work;
22 int gpio;
23 bool active_low;
24 bool beeping;
25};
26
27static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
28{
29 gpio_set_value_cansleep(beep->gpio, on ^ beep->active_low);
30}
31
32static void gpio_beeper_work(struct work_struct *work)
33{
34 struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
35
36 gpio_beeper_toggle(beep, beep->beeping);
37}
38
39static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
40 unsigned int code, int value)
41{
42 struct gpio_beeper *beep = input_get_drvdata(dev);
43
44 if (type != EV_SND || code != SND_BELL)
45 return -ENOTSUPP;
46
47 if (value < 0)
48 return -EINVAL;
49
50 beep->beeping = value;
51 /* Schedule work to actually turn the beeper on or off */
52 schedule_work(&beep->work);
53
54 return 0;
55}
56
57static void gpio_beeper_close(struct input_dev *input)
58{
59 struct gpio_beeper *beep = input_get_drvdata(input);
60
61 cancel_work_sync(&beep->work);
62 gpio_beeper_toggle(beep, false);
63}
64
65static int gpio_beeper_probe(struct platform_device *pdev)
66{
67 struct gpio_beeper *beep;
68 enum of_gpio_flags flags;
69 struct input_dev *input;
70 unsigned long gflags;
71 int err;
72
73 beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
74 if (!beep)
75 return -ENOMEM;
76
77 beep->gpio = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
78 if (!gpio_is_valid(beep->gpio))
79 return beep->gpio;
80
81 input = devm_input_allocate_device(&pdev->dev);
82 if (!input)
83 return -ENOMEM;
84
85 INIT_WORK(&beep->work, gpio_beeper_work);
86
87 input->name = pdev->name;
88 input->id.bustype = BUS_HOST;
89 input->id.vendor = 0x0001;
90 input->id.product = 0x0001;
91 input->id.version = 0x0100;
92 input->close = gpio_beeper_close;
93 input->event = gpio_beeper_event;
94
95 input_set_capability(input, EV_SND, SND_BELL);
96
97 beep->active_low = flags & OF_GPIO_ACTIVE_LOW;
98 gflags = beep->active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
99
100 err = devm_gpio_request_one(&pdev->dev, beep->gpio, gflags, pdev->name);
101 if (err)
102 return err;
103
104 input_set_drvdata(input, beep);
105
106 return input_register_device(input);
107}
108
109static struct of_device_id gpio_beeper_of_match[] = {
110 { .compatible = BEEPER_MODNAME, },
111 { }
112};
113MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
114
115static struct platform_driver gpio_beeper_platform_driver = {
116 .driver = {
117 .name = BEEPER_MODNAME,
118 .owner = THIS_MODULE,
119 .of_match_table = gpio_beeper_of_match,
120 },
121 .probe = gpio_beeper_probe,
122};
123module_platform_driver(gpio_beeper_platform_driver);
124
125MODULE_LICENSE("GPL");
126MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
127MODULE_DESCRIPTION("Generic GPIO beeper driver");