gpio-twl6040.c
3.43 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
/*
* Access to GPOs on TWL6040 chip
*
* Copyright (C) 2012 Texas Instruments, Inc.
*
* Authors:
* Sergio Aguirre <saaguirre@ti.com>
* Peter Ujfalusi <peter.ujfalusi@ti.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/mfd/twl6040.h>
static struct gpio_chip twl6040gpo_chip;
static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
{
struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
int ret = 0;
ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
if (ret < 0)
return ret;
return (ret >> offset) & 1;
}
static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
int value)
{
/* This only drives GPOs, and can't change direction */
return 0;
}
static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
int ret;
u8 gpoctl;
ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
if (ret < 0)
return;
if (value)
gpoctl = ret | (1 << offset);
else
gpoctl = ret & ~(1 << offset);
twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
}
static struct gpio_chip twl6040gpo_chip = {
.label = "twl6040",
.owner = THIS_MODULE,
.get = twl6040gpo_get,
.direction_output = twl6040gpo_direction_out,
.set = twl6040gpo_set,
.can_sleep = true,
};
/*----------------------------------------------------------------------*/
static int gpo_twl6040_probe(struct platform_device *pdev)
{
struct device *twl6040_core_dev = pdev->dev.parent;
struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
int ret;
twl6040gpo_chip.base = -1;
if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
else
twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
twl6040gpo_chip.dev = &pdev->dev;
#ifdef CONFIG_OF_GPIO
twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
#endif
ret = gpiochip_add(&twl6040gpo_chip);
if (ret < 0) {
dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
twl6040gpo_chip.ngpio = 0;
}
return ret;
}
static int gpo_twl6040_remove(struct platform_device *pdev)
{
return gpiochip_remove(&twl6040gpo_chip);
}
/* Note: this hardware lives inside an I2C-based multi-function device. */
MODULE_ALIAS("platform:twl6040-gpo");
static struct platform_driver gpo_twl6040_driver = {
.driver = {
.name = "twl6040-gpo",
.owner = THIS_MODULE,
},
.probe = gpo_twl6040_probe,
.remove = gpo_twl6040_remove,
};
module_platform_driver(gpo_twl6040_driver);
MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("GPO interface for TWL6040");
MODULE_LICENSE("GPL");