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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
976358e2 AS |
2 | /* |
3 | * Generic GPIO beeper driver | |
4 | * | |
c95dc011 | 5 | * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru> |
976358e2 AS |
6 | */ |
7 | ||
8 | #include <linux/input.h> | |
9 | #include <linux/module.h> | |
c95dc011 AS |
10 | #include <linux/gpio/consumer.h> |
11 | #include <linux/of.h> | |
976358e2 AS |
12 | #include <linux/workqueue.h> |
13 | #include <linux/platform_device.h> | |
14 | ||
15 | #define BEEPER_MODNAME "gpio-beeper" | |
16 | ||
17 | struct gpio_beeper { | |
18 | struct work_struct work; | |
c95dc011 | 19 | struct gpio_desc *desc; |
976358e2 AS |
20 | bool beeping; |
21 | }; | |
22 | ||
23 | static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on) | |
24 | { | |
c95dc011 | 25 | gpiod_set_value_cansleep(beep->desc, on); |
976358e2 AS |
26 | } |
27 | ||
28 | static 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 | ||
35 | static 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 | ||
53 | static 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 | ||
61 | static int gpio_beeper_probe(struct platform_device *pdev) | |
62 | { | |
63 | struct gpio_beeper *beep; | |
976358e2 | 64 | struct input_dev *input; |
976358e2 AS |
65 | |
66 | beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL); | |
67 | if (!beep) | |
68 | return -ENOMEM; | |
69 | ||
ea0afac4 | 70 | beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW); |
c95dc011 AS |
71 | if (IS_ERR(beep->desc)) |
72 | return PTR_ERR(beep->desc); | |
976358e2 AS |
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 | ||
976358e2 AS |
90 | input_set_drvdata(input, beep); |
91 | ||
92 | return input_register_device(input); | |
93 | } | |
94 | ||
c95dc011 | 95 | #ifdef CONFIG_OF |
355b9115 | 96 | static const struct of_device_id gpio_beeper_of_match[] = { |
976358e2 AS |
97 | { .compatible = BEEPER_MODNAME, }, |
98 | { } | |
99 | }; | |
100 | MODULE_DEVICE_TABLE(of, gpio_beeper_of_match); | |
c95dc011 | 101 | #endif |
976358e2 AS |
102 | |
103 | static struct platform_driver gpio_beeper_platform_driver = { | |
104 | .driver = { | |
105 | .name = BEEPER_MODNAME, | |
c95dc011 | 106 | .of_match_table = of_match_ptr(gpio_beeper_of_match), |
976358e2 AS |
107 | }, |
108 | .probe = gpio_beeper_probe, | |
109 | }; | |
110 | module_platform_driver(gpio_beeper_platform_driver); | |
111 | ||
112 | MODULE_LICENSE("GPL"); | |
113 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
114 | MODULE_DESCRIPTION("Generic GPIO beeper driver"); |