1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2021, Ahmad Fatoum
*/
#include <common.h>
#include <regulator.h>
#include <sound.h>
#include <of.h>
#include <gpio.h>
#include <of_gpio.h>
struct gpio_beeper {
int gpio;
struct sound_card card;
};
static int gpio_beeper_beep(struct sound_card *card, unsigned freq, unsigned duration)
{
struct gpio_beeper *beeper = container_of(card, struct gpio_beeper, card);
gpio_set_active(beeper->gpio, freq);
return 0;
}
static int gpio_beeper_probe(struct device_d *dev)
{
struct device_node *np = dev->device_node;
struct gpio_beeper *beeper;
struct sound_card *card;
enum of_gpio_flags of_flags;
unsigned long gpio_flags = GPIOF_OUT_INIT_ACTIVE;
int ret, gpio;
gpio = of_get_named_gpio_flags(np, "gpios", 0, &of_flags);
if (!gpio_is_valid(gpio))
return gpio;
if (of_flags & OF_GPIO_ACTIVE_LOW)
gpio_flags |= GPIOF_ACTIVE_LOW;
ret = gpio_request_one(gpio, gpio_flags, "gpio-beeper");
if (ret) {
dev_err(dev, "failed to request gpio %d: %d\n", gpio, ret);
return ret;
}
beeper = xzalloc(sizeof(*beeper));
beeper->gpio = gpio;
dev->priv = beeper;
card = &beeper->card;
card->name = np->full_name;
card->beep = gpio_beeper_beep;
return sound_card_register(card);
}
static void gpio_beeper_suspend(struct device_d *dev)
{
struct gpio_beeper *beeper = dev->priv;
gpio_beeper_beep(&beeper->card, 0, 0);
}
static const struct of_device_id gpio_beeper_match[] = {
{ .compatible = "gpio-beeper", },
{ },
};
static struct driver_d gpio_beeper_driver = {
.name = "gpio-beeper",
.probe = gpio_beeper_probe,
.remove = gpio_beeper_suspend,
.of_compatible = gpio_beeper_match,
};
device_platform_driver(gpio_beeper_driver);
|
