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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* tps65910.c -- TI TPS6591x
*
* Copyright 2010 Texas Instruments Inc.
*
* Author: Graeme Gregory <gg@slimlogic.co.uk>
* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
*
* 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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65910.h>
static struct mfd_cell tps65910s[] = {
{
.name = "tps65910-pmic",
},
{
.name = "tps65910-rtc",
},
{
.name = "tps65910-power",
},
};
static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
int bytes, void *dest)
{
struct i2c_client *i2c = tps65910->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 tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
int bytes, void *src)
{
struct i2c_client *i2c = tps65910->i2c_client;
/* we add 1 byte for device register */
u8 msg[TPS65910_MAX_REGISTER + 1];
int ret;
if (bytes > (TPS65910_MAX_REGISTER + 1))
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;
}
int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
{
u8 data;
int err;
mutex_lock(&tps65910->io_mutex);
err = tps65910_i2c_read(tps65910, reg, 1, &data);
if (err) {
dev_err(tps65910->dev, "read from reg %x failed\n", reg);
goto out;
}
data |= mask;
err = tps65910_i2c_write(tps65910, reg, 1, &data);
if (err)
dev_err(tps65910->dev, "write to reg %x failed\n", reg);
out:
mutex_unlock(&tps65910->io_mutex);
return err;
}
EXPORT_SYMBOL_GPL(tps65910_set_bits);
int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
{
u8 data;
int err;
mutex_lock(&tps65910->io_mutex);
err = tps65910_i2c_read(tps65910, reg, 1, &data);
if (err) {
dev_err(tps65910->dev, "read from reg %x failed\n", reg);
goto out;
}
data &= mask;
err = tps65910_i2c_write(tps65910, reg, 1, &data);
if (err)
dev_err(tps65910->dev, "write to reg %x failed\n", reg);
out:
mutex_unlock(&tps65910->io_mutex);
return err;
}
EXPORT_SYMBOL_GPL(tps65910_clear_bits);
static int tps65910_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct tps65910 *tps65910;
struct tps65910_board *pmic_plat_data;
int ret = 0;
pmic_plat_data = dev_get_platdata(&i2c->dev);
if (!pmic_plat_data)
return -EINVAL;
tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
if (tps65910 == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, tps65910);
tps65910->dev = &i2c->dev;
tps65910->i2c_client = i2c;
tps65910->read = tps65910_i2c_read;
tps65910->write = tps65910_i2c_write;
mutex_init(&tps65910->io_mutex);
ret = mfd_add_devices(tps65910->dev, -1,
tps65910s, ARRAY_SIZE(tps65910s),
NULL, 0);
if (ret < 0)
goto err;
tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
return ret;
err:
mfd_remove_devices(tps65910->dev);
kfree(tps65910);
return ret;
}
static int tps65910_i2c_remove(struct i2c_client *i2c)
{
struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
mfd_remove_devices(tps65910->dev);
kfree(tps65910);
return 0;
}
static const struct i2c_device_id tps65910_i2c_id[] = {
{ "tps65910", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
static struct i2c_driver tps65910_i2c_driver = {
.driver = {
.name = "tps65910",
.owner = THIS_MODULE,
},
.probe = tps65910_i2c_probe,
.remove = tps65910_i2c_remove,
.id_table = tps65910_i2c_id,
};
static int __init tps65910_i2c_init(void)
{
return i2c_add_driver(&tps65910_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps65910_i2c_init);
static void __exit tps65910_i2c_exit(void)
{
i2c_del_driver(&tps65910_i2c_driver);
}
module_exit(tps65910_i2c_exit);
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
MODULE_LICENSE("GPL");
|
