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
|
/*
* tps6507x.c -- TPS6507x chip family multi-function driver
*
* Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
*
* Author: Todd Fischer
* todd.fischer@ridgerun.com
*
* Credits:
*
* Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
*
* For licencing details see kernel-base/COPYING
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6507x.h>
static struct mfd_cell tps6507x_devs[] = {
{
.name = "tps6507x-pmic",
},
{
.name = "tps6507x-ts",
},
};
static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
int bytes, void *dest)
{
struct i2c_client *i2c = tps6507x->i2c_client;
struct i2c_msg xfer[2];
int ret;
/* Write register */
xfer[0].addr = i2c->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = ®
/* Read data */
xfer[1].addr = i2c->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = bytes;
xfer[1].buf = dest;
ret = i2c_transfer(i2c->adapter, xfer, 2);
if (ret == 2)
ret = 0;
else if (ret >= 0)
ret = -EIO;
return ret;
}
static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
int bytes, void *src)
{
struct i2c_client *i2c = tps6507x->i2c_client;
/* we add 1 byte for device register */
u8 msg[TPS6507X_MAX_REGISTER + 1];
int ret;
if (bytes > TPS6507X_MAX_REGISTER)
return -EINVAL;
msg[0] = reg;
memcpy(&msg[1], src, bytes);
ret = i2c_master_send(i2c, msg, bytes + 1);
if (ret < 0)
return ret;
if (ret != bytes + 1)
return -EIO;
return 0;
}
static int tps6507x_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct tps6507x_dev *tps6507x;
int ret = 0;
tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
if (tps6507x == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, tps6507x);
tps6507x->dev = &i2c->dev;
tps6507x->i2c_client = i2c;
tps6507x->read_dev = tps6507x_i2c_read_device;
tps6507x->write_dev = tps6507x_i2c_write_device;
ret = mfd_add_devices(tps6507x->dev, -1,
tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
NULL, 0);
if (ret < 0)
goto err;
return ret;
err:
mfd_remove_devices(tps6507x->dev);
kfree(tps6507x);
return ret;
}
static int tps6507x_i2c_remove(struct i2c_client *i2c)
{
struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
mfd_remove_devices(tps6507x->dev);
kfree(tps6507x);
return 0;
}
static const struct i2c_device_id tps6507x_i2c_id[] = {
{ "tps6507x", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
static struct i2c_driver tps6507x_i2c_driver = {
.driver = {
.name = "tps6507x",
.owner = THIS_MODULE,
},
.probe = tps6507x_i2c_probe,
.remove = tps6507x_i2c_remove,
.id_table = tps6507x_i2c_id,
};
static int __init tps6507x_i2c_init(void)
{
return i2c_add_driver(&tps6507x_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps6507x_i2c_init);
static void __exit tps6507x_i2c_exit(void)
{
i2c_del_driver(&tps6507x_i2c_driver);
}
module_exit(tps6507x_i2c_exit);
MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
MODULE_LICENSE("GPL");
|
