input: Touchscreen driver for TPS6507x
[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 #include <linux/slab.h>
17
18 static inline int pm860x_read_device(struct i2c_client *i2c,
19                                      int reg, int bytes, void *dest)
20 {
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
35 static inline int pm860x_write_device(struct i2c_client *i2c,
36                                       int reg, int bytes, void *src)
37 {
38         unsigned char buf[bytes + 1];
39         int ret;
40
41         buf[0] = (unsigned char)reg;
42         memcpy(&buf[1], src, bytes);
43
44         ret = i2c_master_send(i2c, buf, bytes + 1);
45         if (ret < 0)
46                 return ret;
47         return 0;
48 }
49
50 int pm860x_reg_read(struct i2c_client *i2c, int reg)
51 {
52         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
53         unsigned char data;
54         int ret;
55
56         mutex_lock(&chip->io_lock);
57         ret = pm860x_read_device(i2c, reg, 1, &data);
58         mutex_unlock(&chip->io_lock);
59
60         if (ret < 0)
61                 return ret;
62         else
63                 return (int)data;
64 }
65 EXPORT_SYMBOL(pm860x_reg_read);
66
67 int pm860x_reg_write(struct i2c_client *i2c, int reg,
68                      unsigned char data)
69 {
70         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
71         int ret;
72
73         mutex_lock(&chip->io_lock);
74         ret = pm860x_write_device(i2c, reg, 1, &data);
75         mutex_unlock(&chip->io_lock);
76
77         return ret;
78 }
79 EXPORT_SYMBOL(pm860x_reg_write);
80
81 int pm860x_bulk_read(struct i2c_client *i2c, int reg,
82                      int count, unsigned char *buf)
83 {
84         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
85         int ret;
86
87         mutex_lock(&chip->io_lock);
88         ret = pm860x_read_device(i2c, reg, count, buf);
89         mutex_unlock(&chip->io_lock);
90
91         return ret;
92 }
93 EXPORT_SYMBOL(pm860x_bulk_read);
94
95 int pm860x_bulk_write(struct i2c_client *i2c, int reg,
96                       int count, unsigned char *buf)
97 {
98         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
99         int ret;
100
101         mutex_lock(&chip->io_lock);
102         ret = pm860x_write_device(i2c, reg, count, buf);
103         mutex_unlock(&chip->io_lock);
104
105         return ret;
106 }
107 EXPORT_SYMBOL(pm860x_bulk_write);
108
109 int pm860x_set_bits(struct i2c_client *i2c, int reg,
110                     unsigned char mask, unsigned char data)
111 {
112         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
113         unsigned char value;
114         int ret;
115
116         mutex_lock(&chip->io_lock);
117         ret = pm860x_read_device(i2c, reg, 1, &value);
118         if (ret < 0)
119                 goto out;
120         value &= ~mask;
121         value |= data;
122         ret = pm860x_write_device(i2c, reg, 1, &value);
123 out:
124         mutex_unlock(&chip->io_lock);
125         return ret;
126 }
127 EXPORT_SYMBOL(pm860x_set_bits);
128
129
130 static const struct i2c_device_id pm860x_id_table[] = {
131         { "88PM860x", 0 },
132         {}
133 };
134 MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
135
136 static int verify_addr(struct i2c_client *i2c)
137 {
138         unsigned short addr_8607[] = {0x30, 0x34};
139         unsigned short addr_8606[] = {0x10, 0x11};
140         int size, i;
141
142         if (i2c == NULL)
143                 return 0;
144         size = ARRAY_SIZE(addr_8606);
145         for (i = 0; i < size; i++) {
146                 if (i2c->addr == *(addr_8606 + i))
147                         return CHIP_PM8606;
148         }
149         size = ARRAY_SIZE(addr_8607);
150         for (i = 0; i < size; i++) {
151                 if (i2c->addr == *(addr_8607 + i))
152                         return CHIP_PM8607;
153         }
154         return 0;
155 }
156
157 static int __devinit pm860x_probe(struct i2c_client *client,
158                                   const struct i2c_device_id *id)
159 {
160         struct pm860x_platform_data *pdata = client->dev.platform_data;
161         struct pm860x_chip *chip;
162
163         if (!pdata) {
164                 pr_info("No platform data in %s!\n", __func__);
165                 return -EINVAL;
166         }
167
168         chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
169         if (chip == NULL)
170                 return -ENOMEM;
171
172         chip->id = verify_addr(client);
173         chip->client = client;
174         i2c_set_clientdata(client, chip);
175         chip->dev = &client->dev;
176         mutex_init(&chip->io_lock);
177         dev_set_drvdata(chip->dev, chip);
178
179         /*
180          * Both client and companion client shares same platform driver.
181          * Driver distinguishes them by pdata->companion_addr.
182          * pdata->companion_addr is only assigned if companion chip exists.
183          * At the same time, the companion_addr shouldn't equal to client
184          * address.
185          */
186         if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
187                 chip->companion_addr = pdata->companion_addr;
188                 chip->companion = i2c_new_dummy(chip->client->adapter,
189                                                 chip->companion_addr);
190                 i2c_set_clientdata(chip->companion, chip);
191         }
192
193         pm860x_device_init(chip, pdata);
194         return 0;
195 }
196
197 static int __devexit pm860x_remove(struct i2c_client *client)
198 {
199         struct pm860x_chip *chip = i2c_get_clientdata(client);
200
201         pm860x_device_exit(chip);
202         i2c_unregister_device(chip->companion);
203         i2c_set_clientdata(chip->companion, NULL);
204         i2c_set_clientdata(chip->client, NULL);
205         i2c_set_clientdata(client, NULL);
206         kfree(chip);
207         return 0;
208 }
209
210 static struct i2c_driver pm860x_driver = {
211         .driver = {
212                 .name   = "88PM860x",
213                 .owner  = THIS_MODULE,
214         },
215         .probe          = pm860x_probe,
216         .remove         = __devexit_p(pm860x_remove),
217         .id_table       = pm860x_id_table,
218 };
219
220 static int __init pm860x_i2c_init(void)
221 {
222         int ret;
223         ret = i2c_add_driver(&pm860x_driver);
224         if (ret != 0)
225                 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
226         return ret;
227 }
228 subsys_initcall(pm860x_i2c_init);
229
230 static void __exit pm860x_i2c_exit(void)
231 {
232         i2c_del_driver(&pm860x_driver);
233 }
234 module_exit(pm860x_i2c_exit);
235
236 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
237 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
238 MODULE_LICENSE("GPL");