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authorHaojian Zhuang <haojian.zhuang@marvell.com>2010-01-06 17:04:18 -0500
committerSamuel Ortiz <sameo@linux.intel.com>2010-03-07 16:17:01 -0500
commitbbd51b1ff1bf57b9ed7f062486a415509968d4d9 (patch)
treea7a4270a34b8f3fa0661af088b139c8d9d8314d5 /drivers/mfd/88pm860x-i2c.c
parent0df883df8e8aea79b501f6262b595e66dec175dc (diff)
mfd: Split 88pm8607 driver
Create 88pm8607-i2c driver to support all I2C operation of 88PM8607. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/88pm860x-i2c.c')
-rw-r--r--drivers/mfd/88pm860x-i2c.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c
new file mode 100644
index 000000000000..dda23cbfe415
--- /dev/null
+++ b/drivers/mfd/88pm860x-i2c.c
@@ -0,0 +1,202 @@
1/*
2 * I2C driver for Marvell 88PM8607
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/i2c.h>
15#include <linux/mfd/88pm8607.h>
16
17static inline int pm8607_read_device(struct pm8607_chip *chip,
18 int reg, int bytes, void *dest)
19{
20 struct i2c_client *i2c = chip->client;
21 unsigned char data;
22 int ret;
23
24 data = (unsigned char)reg;
25 ret = i2c_master_send(i2c, &data, 1);
26 if (ret < 0)
27 return ret;
28
29 ret = i2c_master_recv(i2c, dest, bytes);
30 if (ret < 0)
31 return ret;
32 return 0;
33}
34
35static inline int pm8607_write_device(struct pm8607_chip *chip,
36 int reg, int bytes, void *src)
37{
38 struct i2c_client *i2c = chip->client;
39 unsigned char buf[bytes + 1];
40 int ret;
41
42 buf[0] = (unsigned char)reg;
43 memcpy(&buf[1], src, bytes);
44
45 ret = i2c_master_send(i2c, buf, bytes + 1);
46 if (ret < 0)
47 return ret;
48 return 0;
49}
50
51int pm8607_reg_read(struct pm8607_chip *chip, int reg)
52{
53 unsigned char data;
54 int ret;
55
56 mutex_lock(&chip->io_lock);
57 ret = chip->read(chip, reg, 1, &data);
58 mutex_unlock(&chip->io_lock);
59
60 if (ret < 0)
61 return ret;
62 else
63 return (int)data;
64}
65EXPORT_SYMBOL(pm8607_reg_read);
66
67int pm8607_reg_write(struct pm8607_chip *chip, int reg,
68 unsigned char data)
69{
70 int ret;
71
72 mutex_lock(&chip->io_lock);
73 ret = chip->write(chip, reg, 1, &data);
74 mutex_unlock(&chip->io_lock);
75
76 return ret;
77}
78EXPORT_SYMBOL(pm8607_reg_write);
79
80int pm8607_bulk_read(struct pm8607_chip *chip, int reg,
81 int count, unsigned char *buf)
82{
83 int ret;
84
85 mutex_lock(&chip->io_lock);
86 ret = chip->read(chip, reg, count, buf);
87 mutex_unlock(&chip->io_lock);
88
89 return ret;
90}
91EXPORT_SYMBOL(pm8607_bulk_read);
92
93int pm8607_bulk_write(struct pm8607_chip *chip, int reg,
94 int count, unsigned char *buf)
95{
96 int ret;
97
98 mutex_lock(&chip->io_lock);
99 ret = chip->write(chip, reg, count, buf);
100 mutex_unlock(&chip->io_lock);
101
102 return ret;
103}
104EXPORT_SYMBOL(pm8607_bulk_write);
105
106int pm8607_set_bits(struct pm8607_chip *chip, int reg,
107 unsigned char mask, unsigned char data)
108{
109 unsigned char value;
110 int ret;
111
112 mutex_lock(&chip->io_lock);
113 ret = chip->read(chip, reg, 1, &value);
114 if (ret < 0)
115 goto out;
116 value &= ~mask;
117 value |= data;
118 ret = chip->write(chip, reg, 1, &value);
119out:
120 mutex_unlock(&chip->io_lock);
121 return ret;
122}
123EXPORT_SYMBOL(pm8607_set_bits);
124
125
126static const struct i2c_device_id pm860x_id_table[] = {
127 { "88PM8607", 0 },
128 {}
129};
130MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
131
132static int __devinit pm860x_probe(struct i2c_client *client,
133 const struct i2c_device_id *id)
134{
135 struct pm8607_platform_data *pdata = client->dev.platform_data;
136 struct pm8607_chip *chip;
137 int ret;
138
139 chip = kzalloc(sizeof(struct pm8607_chip), GFP_KERNEL);
140 if (chip == NULL)
141 return -ENOMEM;
142
143 chip->client = client;
144 chip->dev = &client->dev;
145 chip->read = pm8607_read_device;
146 chip->write = pm8607_write_device;
147 memcpy(&chip->id, id, sizeof(struct i2c_device_id));
148 i2c_set_clientdata(client, chip);
149
150 mutex_init(&chip->io_lock);
151 dev_set_drvdata(chip->dev, chip);
152
153 ret = pm860x_device_init(chip, pdata);
154 if (ret < 0)
155 goto out;
156
157
158 return 0;
159
160out:
161 i2c_set_clientdata(client, NULL);
162 kfree(chip);
163 return ret;
164}
165
166static int __devexit pm860x_remove(struct i2c_client *client)
167{
168 struct pm8607_chip *chip = i2c_get_clientdata(client);
169
170 kfree(chip);
171 return 0;
172}
173
174static struct i2c_driver pm860x_driver = {
175 .driver = {
176 .name = "88PM860x",
177 .owner = THIS_MODULE,
178 },
179 .probe = pm860x_probe,
180 .remove = __devexit_p(pm860x_remove),
181 .id_table = pm860x_id_table,
182};
183
184static int __init pm860x_i2c_init(void)
185{
186 int ret;
187 ret = i2c_add_driver(&pm860x_driver);
188 if (ret != 0)
189 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
190 return ret;
191}
192subsys_initcall(pm860x_i2c_init);
193
194static void __exit pm860x_i2c_exit(void)
195{
196 i2c_del_driver(&pm860x_driver);
197}
198module_exit(pm860x_i2c_exit);
199
200MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
201MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
202MODULE_LICENSE("GPL");