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
pm860x_read_device(struct i2c_client * i2c,int reg,int bytes,void * dest)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
pm860x_write_device(struct i2c_client * i2c,int reg,int bytes,void * src)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
pm860x_reg_read(struct i2c_client * i2c,int reg)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
pm860x_reg_write(struct i2c_client * i2c,int reg,unsigned char data)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
pm860x_bulk_read(struct i2c_client * i2c,int reg,int count,unsigned char * buf)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
pm860x_bulk_write(struct i2c_client * i2c,int reg,int count,unsigned char * buf)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
pm860x_set_bits(struct i2c_client * i2c,int reg,unsigned char mask,unsigned char data)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
pm860x_page_reg_read(struct i2c_client * i2c,int reg)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
pm860x_page_reg_write(struct i2c_client * i2c,int reg,unsigned char data)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
pm860x_page_bulk_read(struct i2c_client * i2c,int reg,int count,unsigned char * buf)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
pm860x_page_bulk_write(struct i2c_client * i2c,int reg,int count,unsigned char * buf)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
pm860x_page_set_bits(struct i2c_client * i2c,int reg,unsigned char mask,unsigned char data)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
verify_addr(struct i2c_client * i2c)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
pm860x_probe(struct i2c_client * client,const struct i2c_device_id * id)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
pm860x_remove(struct i2c_client * client)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
pm860x_i2c_init(void)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
pm860x_i2c_exit(void)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");
339