Commit | Line | Data |
---|---|---|
976358e2 AS |
1 | /* |
2 | * Generic GPIO beeper driver | |
3 | * | |
c95dc011 | 4 | * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru> |
976358e2 AS |
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> | |
c95dc011 AS |
14 | #include <linux/gpio/consumer.h> |
15 | #include <linux/of.h> | |
976358e2 AS |
16 | #include <linux/workqueue.h> |
17 | #include <linux/platform_device.h> | |
18 | ||
19 | #define BEEPER_MODNAME "gpio-beeper" | |
20 | ||
21 | struct gpio_beeper { | |
22 | struct work_struct work; | |
c95dc011 | 23 | struct gpio_desc *desc; |
976358e2 AS |
24 | bool beeping; |
25 | }; | |
26 | ||
27 | static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on) | |
28 | { | |
c95dc011 | 29 | gpiod_set_value_cansleep(beep->desc, on); |
976358e2 AS |
30 | } |
31 | ||
32 | static 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 | ||
39 | static 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 | ||
57 | static 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 | ||
65 | static int gpio_beeper_probe(struct platform_device *pdev) | |
66 | { | |
67 | struct gpio_beeper *beep; | |
976358e2 | 68 | struct input_dev *input; |
976358e2 AS |
69 | |
70 | beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL); | |
71 | if (!beep) | |
72 | return -ENOMEM; | |
73 | ||
ea0afac4 | 74 | beep->desc = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW); |
c95dc011 AS |
75 | if (IS_ERR(beep->desc)) |
76 | return PTR_ERR(beep->desc); | |
976358e2 AS |
77 | |
78 | input = devm_input_allocate_device(&pdev->dev); | |
79 | if (!input) | |
80 | return -ENOMEM; | |
81 | ||
82 | INIT_WORK(&beep->work, gpio_beeper_work); | |
83 | ||
84 | input->name = pdev->name; | |
85 | input->id.bustype = BUS_HOST; | |
86 | input->id.vendor = 0x0001; | |
87 | input->id.product = 0x0001; | |
88 | input->id.version = 0x0100; | |
89 | input->close = gpio_beeper_close; | |
90 | input->event = gpio_beeper_event; | |
91 | ||
92 | input_set_capability(input, EV_SND, SND_BELL); | |
93 | ||
976358e2 AS |
94 | input_set_drvdata(input, beep); |
95 | ||
96 | return input_register_device(input); | |
97 | } | |
98 | ||
c95dc011 | 99 | #ifdef CONFIG_OF |
355b9115 | 100 | static const struct of_device_id gpio_beeper_of_match[] = { |
976358e2 AS |
101 | { .compatible = BEEPER_MODNAME, }, |
102 | { } | |
103 | }; | |
104 | MODULE_DEVICE_TABLE(of, gpio_beeper_of_match); | |
c95dc011 | 105 | #endif |
976358e2 AS |
106 | |
107 | static struct platform_driver gpio_beeper_platform_driver = { | |
108 | .driver = { | |
109 | .name = BEEPER_MODNAME, | |
c95dc011 | 110 | .of_match_table = of_match_ptr(gpio_beeper_of_match), |
976358e2 AS |
111 | }, |
112 | .probe = gpio_beeper_probe, | |
113 | }; | |
114 | module_platform_driver(gpio_beeper_platform_driver); | |
115 | ||
116 | MODULE_LICENSE("GPL"); | |
117 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
118 | MODULE_DESCRIPTION("Generic GPIO beeper driver"); |