blob: dbcdfb55bb8dd7818313cdfa3eba06628e96aca4 [file] [log] [blame]
Graeme Gregory27c67502011-05-02 16:19:46 -05001/*
2 * tps65910.c -- TI TPS6591x
3 *
4 * Copyright 2010 Texas Instruments Inc.
5 *
6 * Author: Graeme Gregory <gg@slimlogic.co.uk>
7 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/i2c.h>
21#include <linux/gpio.h>
22#include <linux/mfd/core.h>
23#include <linux/mfd/tps65910.h>
24
25static struct mfd_cell tps65910s[] = {
26 {
27 .name = "tps65910-pmic",
28 },
29 {
30 .name = "tps65910-rtc",
31 },
32 {
33 .name = "tps65910-power",
34 },
35};
36
37
38static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
39 int bytes, void *dest)
40{
41 struct i2c_client *i2c = tps65910->i2c_client;
42 struct i2c_msg xfer[2];
43 int ret;
44
45 /* Write register */
46 xfer[0].addr = i2c->addr;
47 xfer[0].flags = 0;
48 xfer[0].len = 1;
49 xfer[0].buf = &reg;
50
51 /* Read data */
52 xfer[1].addr = i2c->addr;
53 xfer[1].flags = I2C_M_RD;
54 xfer[1].len = bytes;
55 xfer[1].buf = dest;
56
57 ret = i2c_transfer(i2c->adapter, xfer, 2);
58 if (ret == 2)
59 ret = 0;
60 else if (ret >= 0)
61 ret = -EIO;
62
63 return ret;
64}
65
66static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
67 int bytes, void *src)
68{
69 struct i2c_client *i2c = tps65910->i2c_client;
70 /* we add 1 byte for device register */
71 u8 msg[TPS65910_MAX_REGISTER + 1];
72 int ret;
73
74 if (bytes > (TPS65910_MAX_REGISTER + 1))
75 return -EINVAL;
76
77 msg[0] = reg;
78 memcpy(&msg[1], src, bytes);
79
80 ret = i2c_master_send(i2c, msg, bytes + 1);
81 if (ret < 0)
82 return ret;
83 if (ret != bytes + 1)
84 return -EIO;
85 return 0;
86}
87
88int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
89{
90 u8 data;
91 int err;
92
93 mutex_lock(&tps65910->io_mutex);
94 err = tps65910_i2c_read(tps65910, reg, 1, &data);
95 if (err) {
96 dev_err(tps65910->dev, "read from reg %x failed\n", reg);
97 goto out;
98 }
99
100 data |= mask;
101 err = tps65910_i2c_write(tps65910, reg, 1, &data);
102 if (err)
103 dev_err(tps65910->dev, "write to reg %x failed\n", reg);
104
105out:
106 mutex_unlock(&tps65910->io_mutex);
107 return err;
108}
109EXPORT_SYMBOL_GPL(tps65910_set_bits);
110
111int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
112{
113 u8 data;
114 int err;
115
116 mutex_lock(&tps65910->io_mutex);
117 err = tps65910_i2c_read(tps65910, reg, 1, &data);
118 if (err) {
119 dev_err(tps65910->dev, "read from reg %x failed\n", reg);
120 goto out;
121 }
122
123 data &= mask;
124 err = tps65910_i2c_write(tps65910, reg, 1, &data);
125 if (err)
126 dev_err(tps65910->dev, "write to reg %x failed\n", reg);
127
128out:
129 mutex_unlock(&tps65910->io_mutex);
130 return err;
131}
132EXPORT_SYMBOL_GPL(tps65910_clear_bits);
133
134static int tps65910_i2c_probe(struct i2c_client *i2c,
135 const struct i2c_device_id *id)
136{
137 struct tps65910 *tps65910;
138 int ret = 0;
139
140 tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
141 if (tps65910 == NULL)
142 return -ENOMEM;
143
144 i2c_set_clientdata(i2c, tps65910);
145 tps65910->dev = &i2c->dev;
146 tps65910->i2c_client = i2c;
147 tps65910->read = tps65910_i2c_read;
148 tps65910->write = tps65910_i2c_write;
149 mutex_init(&tps65910->io_mutex);
150
151 ret = mfd_add_devices(tps65910->dev, -1,
152 tps65910s, ARRAY_SIZE(tps65910s),
153 NULL, 0);
154 if (ret < 0)
155 goto err;
156
157 return ret;
158
159err:
160 mfd_remove_devices(tps65910->dev);
161 kfree(tps65910);
162 return ret;
163}
164
165static int tps65910_i2c_remove(struct i2c_client *i2c)
166{
167 struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
168
169 mfd_remove_devices(tps65910->dev);
170 kfree(tps65910);
171
172 return 0;
173}
174
175static const struct i2c_device_id tps65910_i2c_id[] = {
176 { "tps65910", 0 },
177 { }
178};
179MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
180
181
182static struct i2c_driver tps65910_i2c_driver = {
183 .driver = {
184 .name = "tps65910",
185 .owner = THIS_MODULE,
186 },
187 .probe = tps65910_i2c_probe,
188 .remove = tps65910_i2c_remove,
189 .id_table = tps65910_i2c_id,
190};
191
192static int __init tps65910_i2c_init(void)
193{
194 return i2c_add_driver(&tps65910_i2c_driver);
195}
196/* init early so consumer devices can complete system boot */
197subsys_initcall(tps65910_i2c_init);
198
199static void __exit tps65910_i2c_exit(void)
200{
201 i2c_del_driver(&tps65910_i2c_driver);
202}
203module_exit(tps65910_i2c_exit);
204
205MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
206MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
207MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
208MODULE_LICENSE("GPL");