File: gpio-ucb1400.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (108 lines) | stat: -rw-r--r-- 2,449 bytes parent folder | download | duplicates (14)
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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
/*
 * Philips UCB1400 GPIO driver
 *
 * Author: Marek Vasut <marek.vasut@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/ucb1400.h>

static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
{
	struct ucb1400_gpio *gpio;
	gpio = gpiochip_get_data(gc);
	ucb1400_gpio_set_direction(gpio->ac97, off, 0);
	return 0;
}

static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
{
	struct ucb1400_gpio *gpio;
	gpio = gpiochip_get_data(gc);
	ucb1400_gpio_set_direction(gpio->ac97, off, 1);
	ucb1400_gpio_set_value(gpio->ac97, off, val);
	return 0;
}

static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
{
	struct ucb1400_gpio *gpio;

	gpio = gpiochip_get_data(gc);
	return !!ucb1400_gpio_get_value(gpio->ac97, off);
}

static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
{
	struct ucb1400_gpio *gpio;
	gpio = gpiochip_get_data(gc);
	ucb1400_gpio_set_value(gpio->ac97, off, val);
}

static int ucb1400_gpio_probe(struct platform_device *dev)
{
	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
	int err = 0;

	if (!(ucb && ucb->gpio_offset)) {
		err = -EINVAL;
		goto err;
	}

	platform_set_drvdata(dev, ucb);

	ucb->gc.label = "ucb1400_gpio";
	ucb->gc.base = ucb->gpio_offset;
	ucb->gc.ngpio = 10;
	ucb->gc.owner = THIS_MODULE;

	ucb->gc.direction_input = ucb1400_gpio_dir_in;
	ucb->gc.direction_output = ucb1400_gpio_dir_out;
	ucb->gc.get = ucb1400_gpio_get;
	ucb->gc.set = ucb1400_gpio_set;
	ucb->gc.can_sleep = true;

	err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
	if (err)
		goto err;

	if (ucb->gpio_setup)
		err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);

err:
	return err;

}

static int ucb1400_gpio_remove(struct platform_device *dev)
{
	int err = 0;
	struct ucb1400_gpio *ucb = platform_get_drvdata(dev);

	if (ucb && ucb->gpio_teardown) {
		err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);
		if (err)
			return err;
	}

	return err;
}

static struct platform_driver ucb1400_gpio_driver = {
	.probe	= ucb1400_gpio_probe,
	.remove	= ucb1400_gpio_remove,
	.driver	= {
		.name	= "ucb1400_gpio"
	},
};

module_platform_driver(ucb1400_gpio_driver);

MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ucb1400_gpio");