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
|
/*
* Copyright (C) 2007 Sascha Hauer, Pengutronix
* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
*
* 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 <common.h>
#include <init.h>
#include <driver.h>
#include <xfuncs.h>
#include <errno.h>
#include <i2c/i2c.h>
#include <i2c/mc13892.h>
#define DRIVERNAME "mc13892"
#define to_mc13892(a) container_of(a, struct mc13892, cdev)
static struct mc13892 *mc_dev;
struct mc13892 *mc13892_get(void)
{
if (!mc_dev)
return NULL;
return mc_dev;
}
EXPORT_SYMBOL(mc13892_get);
int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
{
u8 buf[3];
int ret;
ret = i2c_read_reg(mc13892->client, reg, buf, 3);
*val = buf[0] << 16 | buf[1] << 8 | buf[2] << 0;
return ret == 3 ? 0 : ret;
}
EXPORT_SYMBOL(mc13892_reg_read)
int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
{
u8 buf[] = {
val >> 16,
val >> 8,
val >> 0,
};
int ret;
ret = i2c_write_reg(mc13892->client, reg, buf, 3);
return ret == 3 ? 0 : ret;
}
EXPORT_SYMBOL(mc13892_reg_write)
int mc13892_set_bits(struct mc13892 *mc13892, enum mc13892_reg reg, u32 mask, u32 val)
{
u32 tmp;
int err;
err = mc13892_reg_read(mc13892, reg, &tmp);
tmp = (tmp & ~mask) | val;
if (!err)
err = mc13892_reg_write(mc13892, reg, tmp);
return err;
}
EXPORT_SYMBOL(mc13892_set_bits);
static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags)
{
struct mc13892 *priv = to_mc13892(cdev);
u32 *buf = _buf;
size_t i = count >> 2;
int err;
offset >>= 2;
while (i) {
err = mc13892_reg_read(priv, offset, buf);
if (err)
return (ssize_t)err;
buf++;
i--;
offset++;
}
return count;
}
static ssize_t mc_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags)
{
struct mc13892 *mc13892 = to_mc13892(cdev);
const u32 *buf = _buf;
size_t i = count >> 2;
int err;
offset >>= 2;
while (i) {
err = mc13892_reg_write(mc13892, offset, *buf);
if (err)
return (ssize_t)err;
buf++;
i--;
offset++;
}
return count;
}
static struct file_operations mc_fops = {
.lseek = dev_lseek_default,
.read = mc_read,
.write = mc_write,
};
static int mc_probe(struct device_d *dev)
{
if (mc_dev)
return -EBUSY;
mc_dev = xzalloc(sizeof(struct mc13892));
mc_dev->cdev.name = DRIVERNAME;
mc_dev->client = to_i2c_client(dev);
mc_dev->cdev.size = 256;
mc_dev->cdev.dev = dev;
mc_dev->cdev.ops = &mc_fops;
devfs_create(&mc_dev->cdev);
return 0;
}
static struct driver_d mc_driver = {
.name = DRIVERNAME,
.probe = mc_probe,
};
static int mc_init(void)
{
register_driver(&mc_driver);
return 0;
}
device_initcall(mc_init);
|
