1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Generic GPIO beeper driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/input.h>
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/gpio/consumer.h>
11*4882a593Smuzhiyun #include <linux/of.h>
12*4882a593Smuzhiyun #include <linux/workqueue.h>
13*4882a593Smuzhiyun #include <linux/platform_device.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define BEEPER_MODNAME "gpio-beeper"
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun struct gpio_beeper {
18*4882a593Smuzhiyun struct work_struct work;
19*4882a593Smuzhiyun struct gpio_desc *desc;
20*4882a593Smuzhiyun bool beeping;
21*4882a593Smuzhiyun };
22*4882a593Smuzhiyun
gpio_beeper_toggle(struct gpio_beeper * beep,bool on)23*4882a593Smuzhiyun static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun gpiod_set_value_cansleep(beep->desc, on);
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
gpio_beeper_work(struct work_struct * work)28*4882a593Smuzhiyun static void gpio_beeper_work(struct work_struct *work)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun gpio_beeper_toggle(beep, beep->beeping);
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
gpio_beeper_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)35*4882a593Smuzhiyun static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
36*4882a593Smuzhiyun unsigned int code, int value)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun struct gpio_beeper *beep = input_get_drvdata(dev);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (type != EV_SND || code != SND_BELL)
41*4882a593Smuzhiyun return -ENOTSUPP;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun if (value < 0)
44*4882a593Smuzhiyun return -EINVAL;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun beep->beeping = value;
47*4882a593Smuzhiyun /* Schedule work to actually turn the beeper on or off */
48*4882a593Smuzhiyun schedule_work(&beep->work);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun return 0;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
gpio_beeper_close(struct input_dev * input)53*4882a593Smuzhiyun static void gpio_beeper_close(struct input_dev *input)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun struct gpio_beeper *beep = input_get_drvdata(input);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun cancel_work_sync(&beep->work);
58*4882a593Smuzhiyun gpio_beeper_toggle(beep, false);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
gpio_beeper_probe(struct platform_device * pdev)61*4882a593Smuzhiyun static int gpio_beeper_probe(struct platform_device *pdev)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun struct gpio_beeper *beep;
64*4882a593Smuzhiyun struct input_dev *input;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
67*4882a593Smuzhiyun if (!beep)
68*4882a593Smuzhiyun return -ENOMEM;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
71*4882a593Smuzhiyun if (IS_ERR(beep->desc))
72*4882a593Smuzhiyun return PTR_ERR(beep->desc);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun input = devm_input_allocate_device(&pdev->dev);
75*4882a593Smuzhiyun if (!input)
76*4882a593Smuzhiyun return -ENOMEM;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun INIT_WORK(&beep->work, gpio_beeper_work);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun input->name = pdev->name;
81*4882a593Smuzhiyun input->id.bustype = BUS_HOST;
82*4882a593Smuzhiyun input->id.vendor = 0x0001;
83*4882a593Smuzhiyun input->id.product = 0x0001;
84*4882a593Smuzhiyun input->id.version = 0x0100;
85*4882a593Smuzhiyun input->close = gpio_beeper_close;
86*4882a593Smuzhiyun input->event = gpio_beeper_event;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun input_set_capability(input, EV_SND, SND_BELL);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun input_set_drvdata(input, beep);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun return input_register_device(input);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun #ifdef CONFIG_OF
96*4882a593Smuzhiyun static const struct of_device_id gpio_beeper_of_match[] = {
97*4882a593Smuzhiyun { .compatible = BEEPER_MODNAME, },
98*4882a593Smuzhiyun { }
99*4882a593Smuzhiyun };
100*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
101*4882a593Smuzhiyun #endif
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun static struct platform_driver gpio_beeper_platform_driver = {
104*4882a593Smuzhiyun .driver = {
105*4882a593Smuzhiyun .name = BEEPER_MODNAME,
106*4882a593Smuzhiyun .of_match_table = of_match_ptr(gpio_beeper_of_match),
107*4882a593Smuzhiyun },
108*4882a593Smuzhiyun .probe = gpio_beeper_probe,
109*4882a593Smuzhiyun };
110*4882a593Smuzhiyun module_platform_driver(gpio_beeper_platform_driver);
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun MODULE_LICENSE("GPL");
113*4882a593Smuzhiyun MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
114*4882a593Smuzhiyun MODULE_DESCRIPTION("Generic GPIO beeper driver");
115