USB: g_mass_storage: fixed module name in Kconfig
[linux-2.6.git] / drivers / mfd / 88pm860x-i2c.c
1 /*
2  * I2C driver for Marvell 88PM860x
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/88pm860x.h>
16
17 static inline int pm860x_read_device(struct i2c_client *i2c,
18                                      int reg, int bytes, void *dest)
19 {
20         unsigned char data;
21         int ret;
22
23         data = (unsigned char)reg;
24         ret = i2c_master_send(i2c, &data, 1);
25         if (ret < 0)
26                 return ret;
27
28         ret = i2c_master_recv(i2c, dest, bytes);
29         if (ret < 0)
30                 return ret;
31         return 0;
32 }
33
34 static inline int pm860x_write_device(struct i2c_client *i2c,
35                                       int reg, int bytes, void *src)
36 {
37         unsigned char buf[bytes + 1];
38         int ret;
39
40         buf[0] = (unsigned char)reg;
41         memcpy(&buf[1], src, bytes);
42
43         ret = i2c_master_send(i2c, buf, bytes + 1);
44         if (ret < 0)
45                 return ret;
46         return 0;
47 }
48
49 int pm860x_reg_read(struct i2c_client *i2c, int reg)
50 {
51         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
52         unsigned char data;
53         int ret;
54
55         mutex_lock(&chip->io_lock);
56         ret = pm860x_read_device(i2c, reg, 1, &data);
57         mutex_unlock(&chip->io_lock);
58
59         if (ret < 0)
60                 return ret;
61         else
62                 return (int)data;
63 }
64 EXPORT_SYMBOL(pm860x_reg_read);
65
66 int pm860x_reg_write(struct i2c_client *i2c, int reg,
67                      unsigned char data)
68 {
69         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
70         int ret;
71
72         mutex_lock(&chip->io_lock);
73         ret = pm860x_write_device(i2c, reg, 1, &data);
74         mutex_unlock(&chip->io_lock);
75
76         return ret;
77 }
78 EXPORT_SYMBOL(pm860x_reg_write);
79
80 int pm860x_bulk_read(struct i2c_client *i2c, int reg,
81                      int count, unsigned char *buf)
82 {
83         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
84         int ret;
85
86         mutex_lock(&chip->io_lock);
87         ret = pm860x_read_device(i2c, reg, count, buf);
88         mutex_unlock(&chip->io_lock);
89
90         return ret;
91 }
92 EXPORT_SYMBOL(pm860x_bulk_read);
93
94 int pm860x_bulk_write(struct i2c_client *i2c, int reg,
95                       int count, unsigned char *buf)
96 {
97         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
98         int ret;
99
100         mutex_lock(&chip->io_lock);
101         ret = pm860x_write_device(i2c, reg, count, buf);
102         mutex_unlock(&chip->io_lock);
103
104         return ret;
105 }
106 EXPORT_SYMBOL(pm860x_bulk_write);
107
108 int pm860x_set_bits(struct i2c_client *i2c, int reg,
109                     unsigned char mask, unsigned char data)
110 {
111         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
112         unsigned char value;
113         int ret;
114
115         mutex_lock(&chip->io_lock);
116         ret = pm860x_read_device(i2c, reg, 1, &value);
117         if (ret < 0)
118                 goto out;
119         value &= ~mask;
120         value |= data;
121         ret = pm860x_write_device(i2c, reg, 1, &value);
122 out:
123         mutex_unlock(&chip->io_lock);
124         return ret;
125 }
126 EXPORT_SYMBOL(pm860x_set_bits);
127
128
129 static const struct i2c_device_id pm860x_id_table[] = {
130         { "88PM860x", 0 },
131         {}
132 };
133 MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
134
135 static int verify_addr(struct i2c_client *i2c)
136 {
137         unsigned short addr_8607[] = {0x30, 0x34};
138         unsigned short addr_8606[] = {0x10, 0x11};
139         int size, i;
140
141         if (i2c == NULL)
142                 return 0;
143         size = ARRAY_SIZE(addr_8606);
144         for (i = 0; i < size; i++) {
145                 if (i2c->addr == *(addr_8606 + i))
146                         return CHIP_PM8606;
147         }
148         size = ARRAY_SIZE(addr_8607);
149         for (i = 0; i < size; i++) {
150                 if (i2c->addr == *(addr_8607 + i))
151                         return CHIP_PM8607;
152         }
153         return 0;
154 }
155
156 static int __devinit pm860x_probe(struct i2c_client *client,
157                                   const struct i2c_device_id *id)
158 {
159         struct pm860x_platform_data *pdata = client->dev.platform_data;
160         struct pm860x_chip *chip;
161
162         if (!pdata) {
163                 pr_info("No platform data in %s!\n", __func__);
164                 return -EINVAL;
165         }
166
167         chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
168         if (chip == NULL)
169                 return -ENOMEM;
170
171         chip->id = verify_addr(client);
172         chip->client = client;
173         i2c_set_clientdata(client, chip);
174         chip->dev = &client->dev;
175         mutex_init(&chip->io_lock);
176         dev_set_drvdata(chip->dev, chip);
177
178         /*
179          * Both client and companion client shares same platform driver.
180          * Driver distinguishes them by pdata->companion_addr.
181          * pdata->companion_addr is only assigned if companion chip exists.
182          * At the same time, the companion_addr shouldn't equal to client
183          * address.
184          */
185         if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
186                 chip->companion_addr = pdata->companion_addr;
187                 chip->companion = i2c_new_dummy(chip->client->adapter,
188                                                 chip->companion_addr);
189                 i2c_set_clientdata(chip->companion, chip);
190         }
191
192         pm860x_device_init(chip, pdata);
193         return 0;
194 }
195
196 static int __devexit pm860x_remove(struct i2c_client *client)
197 {
198         struct pm860x_chip *chip = i2c_get_clientdata(client);
199
200         pm860x_device_exit(chip);
201         i2c_unregister_device(chip->companion);
202         i2c_set_clientdata(chip->companion, NULL);
203         i2c_set_clientdata(chip->client, NULL);
204         kfree(chip);
205         return 0;
206 }
207
208 static struct i2c_driver pm860x_driver = {
209         .driver = {
210                 .name   = "88PM860x",
211                 .owner  = THIS_MODULE,
212         },
213         .probe          = pm860x_probe,
214         .remove         = __devexit_p(pm860x_remove),
215         .id_table       = pm860x_id_table,
216 };
217
218 static int __init pm860x_i2c_init(void)
219 {
220         int ret;
221         ret = i2c_add_driver(&pm860x_driver);
222         if (ret != 0)
223                 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
224         return ret;
225 }
226 subsys_initcall(pm860x_i2c_init);
227
228 static void __exit pm860x_i2c_exit(void)
229 {
230         i2c_del_driver(&pm860x_driver);
231 }
232 module_exit(pm860x_i2c_exit);
233
234 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
235 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
236 MODULE_LICENSE("GPL");