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
|
/*
* max8698.c - mfd core driver for the Maxim 8998
*
* Copyright (C) 2009-2010 Samsung Electronics
* Kyungmin Park <kyungmin.park@samsung.com>
* Marek Szyprowski <m.szyprowski@samsung.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/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
static struct mfd_cell max8998_devs[] = {
{
.name = "max8998-pmic",
}
};
static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest)
{
struct i2c_client *client = max8998->i2c_client;
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(client, reg);
mutex_unlock(&max8998->iolock);
if (ret < 0)
return ret;
ret &= 0xff;
*dest = ret;
return 0;
}
static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value)
{
struct i2c_client *client = max8998->i2c_client;
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_write_byte_data(client, reg, value);
mutex_unlock(&max8998->iolock);
return ret;
}
static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg,
u8 val, u8 mask)
{
struct i2c_client *client = max8998->i2c_client;
int ret;
mutex_lock(&max8998->iolock);
ret = i2c_smbus_read_byte_data(client, reg);
if (ret >= 0) {
u8 old_val = ret & 0xff;
u8 new_val = (val & mask) | (old_val & (~mask));
ret = i2c_smbus_write_byte_data(client, reg, new_val);
if (ret >= 0)
ret = 0;
}
mutex_unlock(&max8998->iolock);
return ret;
}
static int max8998_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max8998_dev *max8998;
int ret = 0;
max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
if (max8998 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, max8998);
max8998->dev = &i2c->dev;
max8998->i2c_client = i2c;
max8998->dev_read = max8998_i2c_device_read;
max8998->dev_write = max8998_i2c_device_write;
max8998->dev_update = max8998_i2c_device_update;
mutex_init(&max8998->iolock);
ret = mfd_add_devices(max8998->dev, -1,
max8998_devs, ARRAY_SIZE(max8998_devs),
NULL, 0);
if (ret < 0)
goto err;
return ret;
err:
mfd_remove_devices(max8998->dev);
kfree(max8998);
return ret;
}
static int max8998_i2c_remove(struct i2c_client *i2c)
{
struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
mfd_remove_devices(max8998->dev);
kfree(max8998);
return 0;
}
static const struct i2c_device_id max8998_i2c_id[] = {
{ "max8998", 0 },
{ "lp3974", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
static struct i2c_driver max8998_i2c_driver = {
.driver = {
.name = "max8998",
.owner = THIS_MODULE,
},
.probe = max8998_i2c_probe,
.remove = max8998_i2c_remove,
.id_table = max8998_i2c_id,
};
static int __init max8998_i2c_init(void)
{
return i2c_add_driver(&max8998_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max8998_i2c_init);
static void __exit max8998_i2c_exit(void)
{
i2c_del_driver(&max8998_i2c_driver);
}
module_exit(max8998_i2c_exit);
MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
MODULE_LICENSE("GPL");
|
