2 * I2C driver for Marvell 88PM860x
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
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.
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>
18 static inline int pm860x_read_device(struct i2c_client *i2c,
19 int reg, int bytes, void *dest)
24 data = (unsigned char)reg;
25 ret = i2c_master_send(i2c, &data, 1);
29 ret = i2c_master_recv(i2c, dest, bytes);
35 static inline int pm860x_write_device(struct i2c_client *i2c,
36 int reg, int bytes, void *src)
38 unsigned char buf[bytes + 1];
41 buf[0] = (unsigned char)reg;
42 memcpy(&buf[1], src, bytes);
44 ret = i2c_master_send(i2c, buf, bytes + 1);
50 int pm860x_reg_read(struct i2c_client *i2c, int reg)
52 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
56 mutex_lock(&chip->io_lock);
57 ret = pm860x_read_device(i2c, reg, 1, &data);
58 mutex_unlock(&chip->io_lock);
65 EXPORT_SYMBOL(pm860x_reg_read);
67 int pm860x_reg_write(struct i2c_client *i2c, int reg,
70 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
73 mutex_lock(&chip->io_lock);
74 ret = pm860x_write_device(i2c, reg, 1, &data);
75 mutex_unlock(&chip->io_lock);
79 EXPORT_SYMBOL(pm860x_reg_write);
81 int pm860x_bulk_read(struct i2c_client *i2c, int reg,
82 int count, unsigned char *buf)
84 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
87 mutex_lock(&chip->io_lock);
88 ret = pm860x_read_device(i2c, reg, count, buf);
89 mutex_unlock(&chip->io_lock);
93 EXPORT_SYMBOL(pm860x_bulk_read);
95 int pm860x_bulk_write(struct i2c_client *i2c, int reg,
96 int count, unsigned char *buf)
98 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
101 mutex_lock(&chip->io_lock);
102 ret = pm860x_write_device(i2c, reg, count, buf);
103 mutex_unlock(&chip->io_lock);
107 EXPORT_SYMBOL(pm860x_bulk_write);
109 int pm860x_set_bits(struct i2c_client *i2c, int reg,
110 unsigned char mask, unsigned char data)
112 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
116 mutex_lock(&chip->io_lock);
117 ret = pm860x_read_device(i2c, reg, 1, &value);
122 ret = pm860x_write_device(i2c, reg, 1, &value);
124 mutex_unlock(&chip->io_lock);
127 EXPORT_SYMBOL(pm860x_set_bits);
130 static const struct i2c_device_id pm860x_id_table[] = {
134 MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
136 static int verify_addr(struct i2c_client *i2c)
138 unsigned short addr_8607[] = {0x30, 0x34};
139 unsigned short addr_8606[] = {0x10, 0x11};
144 size = ARRAY_SIZE(addr_8606);
145 for (i = 0; i < size; i++) {
146 if (i2c->addr == *(addr_8606 + i))
149 size = ARRAY_SIZE(addr_8607);
150 for (i = 0; i < size; i++) {
151 if (i2c->addr == *(addr_8607 + i))
157 static int __devinit pm860x_probe(struct i2c_client *client,
158 const struct i2c_device_id *id)
160 struct pm860x_platform_data *pdata = client->dev.platform_data;
161 struct pm860x_chip *chip;
164 pr_info("No platform data in %s!\n", __func__);
168 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
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);
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
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);
193 pm860x_device_init(chip, pdata);
197 static int __devexit pm860x_remove(struct i2c_client *client)
199 struct pm860x_chip *chip = i2c_get_clientdata(client);
201 pm860x_device_exit(chip);
202 i2c_unregister_device(chip->companion);
207 static struct i2c_driver pm860x_driver = {
210 .owner = THIS_MODULE,
212 .probe = pm860x_probe,
213 .remove = __devexit_p(pm860x_remove),
214 .id_table = pm860x_id_table,
217 static int __init pm860x_i2c_init(void)
220 ret = i2c_add_driver(&pm860x_driver);
222 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
225 subsys_initcall(pm860x_i2c_init);
227 static void __exit pm860x_i2c_exit(void)
229 i2c_del_driver(&pm860x_driver);
231 module_exit(pm860x_i2c_exit);
233 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
234 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
235 MODULE_LICENSE("GPL");