12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2976358e2SAlexander Shiyan /*
3976358e2SAlexander Shiyan * Generic GPIO beeper driver
4976358e2SAlexander Shiyan *
5c95dc011SAlexander Shiyan * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
6976358e2SAlexander Shiyan */
7976358e2SAlexander Shiyan
8976358e2SAlexander Shiyan #include <linux/input.h>
9976358e2SAlexander Shiyan #include <linux/module.h>
10c95dc011SAlexander Shiyan #include <linux/gpio/consumer.h>
11c95dc011SAlexander Shiyan #include <linux/of.h>
12976358e2SAlexander Shiyan #include <linux/workqueue.h>
13976358e2SAlexander Shiyan #include <linux/platform_device.h>
14976358e2SAlexander Shiyan
15976358e2SAlexander Shiyan #define BEEPER_MODNAME "gpio-beeper"
16976358e2SAlexander Shiyan
17976358e2SAlexander Shiyan struct gpio_beeper {
18976358e2SAlexander Shiyan struct work_struct work;
19c95dc011SAlexander Shiyan struct gpio_desc *desc;
20976358e2SAlexander Shiyan bool beeping;
21976358e2SAlexander Shiyan };
22976358e2SAlexander Shiyan
gpio_beeper_toggle(struct gpio_beeper * beep,bool on)23976358e2SAlexander Shiyan static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
24976358e2SAlexander Shiyan {
25c95dc011SAlexander Shiyan gpiod_set_value_cansleep(beep->desc, on);
26976358e2SAlexander Shiyan }
27976358e2SAlexander Shiyan
gpio_beeper_work(struct work_struct * work)28976358e2SAlexander Shiyan static void gpio_beeper_work(struct work_struct *work)
29976358e2SAlexander Shiyan {
30976358e2SAlexander Shiyan struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
31976358e2SAlexander Shiyan
32976358e2SAlexander Shiyan gpio_beeper_toggle(beep, beep->beeping);
33976358e2SAlexander Shiyan }
34976358e2SAlexander Shiyan
gpio_beeper_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)35976358e2SAlexander Shiyan static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
36976358e2SAlexander Shiyan unsigned int code, int value)
37976358e2SAlexander Shiyan {
38976358e2SAlexander Shiyan struct gpio_beeper *beep = input_get_drvdata(dev);
39976358e2SAlexander Shiyan
40976358e2SAlexander Shiyan if (type != EV_SND || code != SND_BELL)
41976358e2SAlexander Shiyan return -ENOTSUPP;
42976358e2SAlexander Shiyan
43976358e2SAlexander Shiyan if (value < 0)
44976358e2SAlexander Shiyan return -EINVAL;
45976358e2SAlexander Shiyan
46976358e2SAlexander Shiyan beep->beeping = value;
47976358e2SAlexander Shiyan /* Schedule work to actually turn the beeper on or off */
48976358e2SAlexander Shiyan schedule_work(&beep->work);
49976358e2SAlexander Shiyan
50976358e2SAlexander Shiyan return 0;
51976358e2SAlexander Shiyan }
52976358e2SAlexander Shiyan
gpio_beeper_close(struct input_dev * input)53976358e2SAlexander Shiyan static void gpio_beeper_close(struct input_dev *input)
54976358e2SAlexander Shiyan {
55976358e2SAlexander Shiyan struct gpio_beeper *beep = input_get_drvdata(input);
56976358e2SAlexander Shiyan
57976358e2SAlexander Shiyan cancel_work_sync(&beep->work);
58976358e2SAlexander Shiyan gpio_beeper_toggle(beep, false);
59976358e2SAlexander Shiyan }
60976358e2SAlexander Shiyan
gpio_beeper_probe(struct platform_device * pdev)61976358e2SAlexander Shiyan static int gpio_beeper_probe(struct platform_device *pdev)
62976358e2SAlexander Shiyan {
63976358e2SAlexander Shiyan struct gpio_beeper *beep;
64976358e2SAlexander Shiyan struct input_dev *input;
65976358e2SAlexander Shiyan
66976358e2SAlexander Shiyan beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
67976358e2SAlexander Shiyan if (!beep)
68976358e2SAlexander Shiyan return -ENOMEM;
69976358e2SAlexander Shiyan
70ea0afac4SUwe Kleine-König beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
71c95dc011SAlexander Shiyan if (IS_ERR(beep->desc))
72c95dc011SAlexander Shiyan return PTR_ERR(beep->desc);
73976358e2SAlexander Shiyan
74976358e2SAlexander Shiyan input = devm_input_allocate_device(&pdev->dev);
75976358e2SAlexander Shiyan if (!input)
76976358e2SAlexander Shiyan return -ENOMEM;
77976358e2SAlexander Shiyan
78976358e2SAlexander Shiyan INIT_WORK(&beep->work, gpio_beeper_work);
79976358e2SAlexander Shiyan
80976358e2SAlexander Shiyan input->name = pdev->name;
81976358e2SAlexander Shiyan input->id.bustype = BUS_HOST;
82976358e2SAlexander Shiyan input->id.vendor = 0x0001;
83976358e2SAlexander Shiyan input->id.product = 0x0001;
84976358e2SAlexander Shiyan input->id.version = 0x0100;
85976358e2SAlexander Shiyan input->close = gpio_beeper_close;
86976358e2SAlexander Shiyan input->event = gpio_beeper_event;
87976358e2SAlexander Shiyan
88976358e2SAlexander Shiyan input_set_capability(input, EV_SND, SND_BELL);
89976358e2SAlexander Shiyan
90976358e2SAlexander Shiyan input_set_drvdata(input, beep);
91976358e2SAlexander Shiyan
92976358e2SAlexander Shiyan return input_register_device(input);
93976358e2SAlexander Shiyan }
94976358e2SAlexander Shiyan
95c95dc011SAlexander Shiyan #ifdef CONFIG_OF
96355b9115SJingoo Han static const struct of_device_id gpio_beeper_of_match[] = {
97976358e2SAlexander Shiyan { .compatible = BEEPER_MODNAME, },
98976358e2SAlexander Shiyan { }
99976358e2SAlexander Shiyan };
100976358e2SAlexander Shiyan MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
101c95dc011SAlexander Shiyan #endif
102976358e2SAlexander Shiyan
103976358e2SAlexander Shiyan static struct platform_driver gpio_beeper_platform_driver = {
104976358e2SAlexander Shiyan .driver = {
105976358e2SAlexander Shiyan .name = BEEPER_MODNAME,
106c95dc011SAlexander Shiyan .of_match_table = of_match_ptr(gpio_beeper_of_match),
107976358e2SAlexander Shiyan },
108976358e2SAlexander Shiyan .probe = gpio_beeper_probe,
109976358e2SAlexander Shiyan };
110976358e2SAlexander Shiyan module_platform_driver(gpio_beeper_platform_driver);
111976358e2SAlexander Shiyan
112976358e2SAlexander Shiyan MODULE_LICENSE("GPL");
113976358e2SAlexander Shiyan MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
114976358e2SAlexander Shiyan MODULE_DESCRIPTION("Generic GPIO beeper driver");
115