config: tegra3: enable /dev mount with ACL
[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 int pm860x_page_reg_read(struct i2c_client *i2c, int reg)
130 {
131         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
132         unsigned char zero = 0;
133         unsigned char data;
134         int ret;
135
136         mutex_lock(&chip->io_lock);
137         pm860x_write_device(i2c, 0xFA, 0, &zero);
138         pm860x_write_device(i2c, 0xFB, 0, &zero);
139         pm860x_write_device(i2c, 0xFF, 0, &zero);
140         ret = pm860x_read_device(i2c, reg, 1, &data);
141         if (ret >= 0)
142                 ret = (int)data;
143         pm860x_write_device(i2c, 0xFE, 0, &zero);
144         pm860x_write_device(i2c, 0xFC, 0, &zero);
145         mutex_unlock(&chip->io_lock);
146         return ret;
147 }
148 EXPORT_SYMBOL(pm860x_page_reg_read);
149
150 int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
151                           unsigned char data)
152 {
153         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
154         unsigned char zero;
155         int ret;
156
157         mutex_lock(&chip->io_lock);
158         pm860x_write_device(i2c, 0xFA, 0, &zero);
159         pm860x_write_device(i2c, 0xFB, 0, &zero);
160         pm860x_write_device(i2c, 0xFF, 0, &zero);
161         ret = pm860x_write_device(i2c, reg, 1, &data);
162         pm860x_write_device(i2c, 0xFE, 0, &zero);
163         pm860x_write_device(i2c, 0xFC, 0, &zero);
164         mutex_unlock(&chip->io_lock);
165         return ret;
166 }
167 EXPORT_SYMBOL(pm860x_page_reg_write);
168
169 int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
170                           int count, unsigned char *buf)
171 {
172         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
173         unsigned char zero = 0;
174         int ret;
175
176         mutex_lock(&chip->io_lock);
177         pm860x_write_device(i2c, 0xFA, 0, &zero);
178         pm860x_write_device(i2c, 0xFB, 0, &zero);
179         pm860x_write_device(i2c, 0xFF, 0, &zero);
180         ret = pm860x_read_device(i2c, reg, count, buf);
181         pm860x_write_device(i2c, 0xFE, 0, &zero);
182         pm860x_write_device(i2c, 0xFC, 0, &zero);
183         mutex_unlock(&chip->io_lock);
184         return ret;
185 }
186 EXPORT_SYMBOL(pm860x_page_bulk_read);
187
188 int pm860x_page_bulk_write(struct i2c_client *i2c, int reg,
189                            int count, unsigned char *buf)
190 {
191         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
192         unsigned char zero = 0;
193         int ret;
194
195         mutex_lock(&chip->io_lock);
196         pm860x_write_device(i2c, 0xFA, 0, &zero);
197         pm860x_write_device(i2c, 0xFB, 0, &zero);
198         pm860x_write_device(i2c, 0xFF, 0, &zero);
199         ret = pm860x_write_device(i2c, reg, count, buf);
200         pm860x_write_device(i2c, 0xFE, 0, &zero);
201         pm860x_write_device(i2c, 0xFC, 0, &zero);
202         mutex_unlock(&chip->io_lock);
203         return ret;
204 }
205 EXPORT_SYMBOL(pm860x_page_bulk_write);
206
207 int pm860x_page_set_bits(struct i2c_client *i2c, int reg,
208                          unsigned char mask, unsigned char data)
209 {
210         struct pm860x_chip *chip = i2c_get_clientdata(i2c);
211         unsigned char zero;
212         unsigned char value;
213         int ret;
214
215         mutex_lock(&chip->io_lock);
216         pm860x_write_device(i2c, 0xFA, 0, &zero);
217         pm860x_write_device(i2c, 0xFB, 0, &zero);
218         pm860x_write_device(i2c, 0xFF, 0, &zero);
219         ret = pm860x_read_device(i2c, reg, 1, &value);
220         if (ret < 0)
221                 goto out;
222         value &= ~mask;
223         value |= data;
224         ret = pm860x_write_device(i2c, reg, 1, &value);
225 out:
226         pm860x_write_device(i2c, 0xFE, 0, &zero);
227         pm860x_write_device(i2c, 0xFC, 0, &zero);
228         mutex_unlock(&chip->io_lock);
229         return ret;
230 }
231 EXPORT_SYMBOL(pm860x_page_set_bits);
232
233 static const struct i2c_device_id pm860x_id_table[] = {
234         { "88PM860x", 0 },
235         {}
236 };
237 MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
238
239 static int verify_addr(struct i2c_client *i2c)
240 {
241         unsigned short addr_8607[] = {0x30, 0x34};
242         unsigned short addr_8606[] = {0x10, 0x11};
243         int size, i;
244
245         if (i2c == NULL)
246                 return 0;
247         size = ARRAY_SIZE(addr_8606);
248         for (i = 0; i < size; i++) {
249                 if (i2c->addr == *(addr_8606 + i))
250                         return CHIP_PM8606;
251         }
252         size = ARRAY_SIZE(addr_8607);
253         for (i = 0; i < size; i++) {
254                 if (i2c->addr == *(addr_8607 + i))
255                         return CHIP_PM8607;
256         }
257         return 0;
258 }
259
260 static int __devinit pm860x_probe(struct i2c_client *client,
261                                   const struct i2c_device_id *id)
262 {
263         struct pm860x_platform_data *pdata = client->dev.platform_data;
264         struct pm860x_chip *chip;
265
266         if (!pdata) {
267                 pr_info("No platform data in %s!\n", __func__);
268                 return -EINVAL;
269         }
270
271         chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
272         if (chip == NULL)
273                 return -ENOMEM;
274
275         chip->id = verify_addr(client);
276         chip->client = client;
277         i2c_set_clientdata(client, chip);
278         chip->dev = &client->dev;
279         mutex_init(&chip->io_lock);
280         dev_set_drvdata(chip->dev, chip);
281
282         /*
283          * Both client and companion client shares same platform driver.
284          * Driver distinguishes them by pdata->companion_addr.
285          * pdata->companion_addr is only assigned if companion chip exists.
286          * At the same time, the companion_addr shouldn't equal to client
287          * address.
288          */
289         if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
290                 chip->companion_addr = pdata->companion_addr;
291                 chip->companion = i2c_new_dummy(chip->client->adapter,
292                                                 chip->companion_addr);
293                 i2c_set_clientdata(chip->companion, chip);
294         }
295
296         pm860x_device_init(chip, pdata);
297         return 0;
298 }
299
300 static int __devexit pm860x_remove(struct i2c_client *client)
301 {
302         struct pm860x_chip *chip = i2c_get_clientdata(client);
303
304         pm860x_device_exit(chip);
305         i2c_unregister_device(chip->companion);
306         kfree(chip);
307         return 0;
308 }
309
310 static struct i2c_driver pm860x_driver = {
311         .driver = {
312                 .name   = "88PM860x",
313                 .owner  = THIS_MODULE,
314         },
315         .probe          = pm860x_probe,
316         .remove         = __devexit_p(pm860x_remove),
317         .id_table       = pm860x_id_table,
318 };
319
320 static int __init pm860x_i2c_init(void)
321 {
322         int ret;
323         ret = i2c_add_driver(&pm860x_driver);
324         if (ret != 0)
325                 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
326         return ret;
327 }
328 subsys_initcall(pm860x_i2c_init);
329
330 static void __exit pm860x_i2c_exit(void)
331 {
332         i2c_del_driver(&pm860x_driver);
333 }
334 module_exit(pm860x_i2c_exit);
335
336 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
337 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
338 MODULE_LICENSE("GPL");