gpio-wm8350.c
4.43 KB
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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
* gpiolib support for Wolfson WM835x PMICs
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/gpio.h>
struct wm8350_gpio_data {
struct wm8350 *wm8350;
struct gpio_chip gpio_chip;
};
static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct wm8350_gpio_data, gpio_chip);
}
static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
struct wm8350 *wm8350 = wm8350_gpio->wm8350;
return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
1 << offset);
}
static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
struct wm8350 *wm8350 = wm8350_gpio->wm8350;
int ret;
ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
if (ret < 0)
return ret;
if (ret & (1 << offset))
return 1;
else
return 0;
}
static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
struct wm8350 *wm8350 = wm8350_gpio->wm8350;
if (value)
wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
else
wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
}
static int wm8350_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
struct wm8350 *wm8350 = wm8350_gpio->wm8350;
int ret;
ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
1 << offset);
if (ret < 0)
return ret;
/* Don't have an atomic direction/value setup */
wm8350_gpio_set(chip, offset, value);
return 0;
}
static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
struct wm8350 *wm8350 = wm8350_gpio->wm8350;
if (!wm8350->irq_base)
return -EINVAL;
return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
}
static struct gpio_chip template_chip = {
.label = "wm8350",
.owner = THIS_MODULE,
.direction_input = wm8350_gpio_direction_in,
.get = wm8350_gpio_get,
.direction_output = wm8350_gpio_direction_out,
.set = wm8350_gpio_set,
.to_irq = wm8350_gpio_to_irq,
.can_sleep = true,
};
static int wm8350_gpio_probe(struct platform_device *pdev)
{
struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev);
struct wm8350_gpio_data *wm8350_gpio;
int ret;
wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio),
GFP_KERNEL);
if (wm8350_gpio == NULL)
return -ENOMEM;
wm8350_gpio->wm8350 = wm8350;
wm8350_gpio->gpio_chip = template_chip;
wm8350_gpio->gpio_chip.ngpio = 13;
wm8350_gpio->gpio_chip.dev = &pdev->dev;
if (pdata && pdata->gpio_base)
wm8350_gpio->gpio_chip.base = pdata->gpio_base;
else
wm8350_gpio->gpio_chip.base = -1;
ret = gpiochip_add(&wm8350_gpio->gpio_chip);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, wm8350_gpio);
return ret;
}
static int wm8350_gpio_remove(struct platform_device *pdev)
{
struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
gpiochip_remove(&wm8350_gpio->gpio_chip);
return 0;
}
static struct platform_driver wm8350_gpio_driver = {
.driver.name = "wm8350-gpio",
.driver.owner = THIS_MODULE,
.probe = wm8350_gpio_probe,
.remove = wm8350_gpio_remove,
};
static int __init wm8350_gpio_init(void)
{
return platform_driver_register(&wm8350_gpio_driver);
}
subsys_initcall(wm8350_gpio_init);
static void __exit wm8350_gpio_exit(void)
{
platform_driver_unregister(&wm8350_gpio_driver);
}
module_exit(wm8350_gpio_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8350-gpio");