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>
17 static inline int pm860x_read_device(struct i2c_client *i2c,
18 int reg, int bytes, void *dest)
23 data = (unsigned char)reg;
24 ret = i2c_master_send(i2c, &data, 1);
28 ret = i2c_master_recv(i2c, dest, bytes);
34 static inline int pm860x_write_device(struct i2c_client *i2c,
35 int reg, int bytes, void *src)
37 unsigned char buf[bytes + 1];
40 buf[0] = (unsigned char)reg;
41 memcpy(&buf[1], src, bytes);
43 ret = i2c_master_send(i2c, buf, bytes + 1);
49 int pm860x_reg_read(struct i2c_client *i2c, int reg)
51 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
55 mutex_lock(&chip->io_lock);
56 ret = pm860x_read_device(i2c, reg, 1, &data);
57 mutex_unlock(&chip->io_lock);
64 EXPORT_SYMBOL(pm860x_reg_read);
66 int pm860x_reg_write(struct i2c_client *i2c, int reg,
69 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
72 mutex_lock(&chip->io_lock);
73 ret = pm860x_write_device(i2c, reg, 1, &data);
74 mutex_unlock(&chip->io_lock);
78 EXPORT_SYMBOL(pm860x_reg_write);
80 int pm860x_bulk_read(struct i2c_client *i2c, int reg,
81 int count, unsigned char *buf)
83 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
86 mutex_lock(&chip->io_lock);
87 ret = pm860x_read_device(i2c, reg, count, buf);
88 mutex_unlock(&chip->io_lock);
92 EXPORT_SYMBOL(pm860x_bulk_read);
94 int pm860x_bulk_write(struct i2c_client *i2c, int reg,
95 int count, unsigned char *buf)
97 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
100 mutex_lock(&chip->io_lock);
101 ret = pm860x_write_device(i2c, reg, count, buf);
102 mutex_unlock(&chip->io_lock);
106 EXPORT_SYMBOL(pm860x_bulk_write);
108 int pm860x_set_bits(struct i2c_client *i2c, int reg,
109 unsigned char mask, unsigned char data)
111 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
115 mutex_lock(&chip->io_lock);
116 ret = pm860x_read_device(i2c, reg, 1, &value);
121 ret = pm860x_write_device(i2c, reg, 1, &value);
123 mutex_unlock(&chip->io_lock);
126 EXPORT_SYMBOL(pm860x_set_bits);
129 static const struct i2c_device_id pm860x_id_table[] = {
133 MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
135 static int verify_addr(struct i2c_client *i2c)
137 unsigned short addr_8607[] = {0x30, 0x34};
138 unsigned short addr_8606[] = {0x10, 0x11};
143 size = ARRAY_SIZE(addr_8606);
144 for (i = 0; i < size; i++) {
145 if (i2c->addr == *(addr_8606 + i))
148 size = ARRAY_SIZE(addr_8607);
149 for (i = 0; i < size; i++) {
150 if (i2c->addr == *(addr_8607 + i))
156 static int __devinit pm860x_probe(struct i2c_client *client,
157 const struct i2c_device_id *id)
159 struct pm860x_platform_data *pdata = client->dev.platform_data;
160 static struct pm860x_chip *chip;
161 struct i2c_board_info i2c_info = {
163 .platform_data = client->dev.platform_data,
165 int addr_c, found_companion = 0;
168 pr_info("No platform data in %s!\n", __func__);
173 * Both client and companion client shares same platform driver.
174 * Driver distinguishes them by pdata->companion_addr.
175 * pdata->companion_addr is only assigned if companion chip exists.
176 * At the same time, the companion_addr shouldn't equal to client
179 addr_c = pdata->companion_addr;
180 if (addr_c && (addr_c != client->addr)) {
181 i2c_info.addr = addr_c;
185 if (found_companion || (addr_c == 0)) {
186 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
190 chip->id = verify_addr(client);
191 chip->companion_addr = addr_c;
192 chip->client = client;
193 i2c_set_clientdata(client, chip);
194 chip->dev = &client->dev;
195 mutex_init(&chip->io_lock);
196 dev_set_drvdata(chip->dev, chip);
198 if (found_companion) {
200 * If this driver is built in, probe function is
202 * If this driver is built as module, the next probe
203 * function is called after the first one finished.
205 chip->companion = i2c_new_device(client->adapter,
211 * If companion chip existes, it's called by companion probe.
212 * If there's no companion chip, it's called by client probe.
214 if ((addr_c == 0) || (addr_c == client->addr)) {
215 chip->companion = client;
216 i2c_set_clientdata(chip->companion, chip);
217 pm860x_device_init(chip, pdata);
222 static int __devexit pm860x_remove(struct i2c_client *client)
224 struct pm860x_chip *chip = i2c_get_clientdata(client);
227 * If companion existes, companion client is removed first.
228 * Because companion client is registered last and removed first.
230 if (chip->companion_addr == client->addr)
232 pm860x_device_exit(chip);
233 i2c_unregister_device(chip->companion);
234 i2c_set_clientdata(chip->companion, NULL);
235 i2c_set_clientdata(chip->client, NULL);
240 static struct i2c_driver pm860x_driver = {
243 .owner = THIS_MODULE,
245 .probe = pm860x_probe,
246 .remove = __devexit_p(pm860x_remove),
247 .id_table = pm860x_id_table,
250 static int __init pm860x_i2c_init(void)
253 ret = i2c_add_driver(&pm860x_driver);
255 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
258 subsys_initcall(pm860x_i2c_init);
260 static void __exit pm860x_i2c_exit(void)
262 i2c_del_driver(&pm860x_driver);
264 module_exit(pm860x_i2c_exit);
266 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
267 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
268 MODULE_LICENSE("GPL");