[net-next-2.6.git] / drivers / mfd / max8925-i2c.c

/*
 * I2C driver for Maxim MAX8925
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *	Haojian Zhuang <haojian.zhuang@marvell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/mfd/max8925.h>
#include <linux/slab.h>

#define RTC_I2C_ADDR		0x68
#define ADC_I2C_ADDR		0x47

static inline int max8925_read_device(struct i2c_client *i2c,
				      int reg, int bytes, void *dest)
{
	int ret;

	if (bytes > 1)
		ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest);
	else {
		ret = i2c_smbus_read_byte_data(i2c, reg);
		if (ret < 0)
			return ret;
		*(unsigned char *)dest = (unsigned char)ret;
	}
	return ret;
}

static inline int max8925_write_device(struct i2c_client *i2c,
				       int reg, int bytes, void *src)
{
	unsigned char buf[bytes + 1];
	int ret;

	buf[0] = (unsigned char)reg;
	memcpy(&buf[1], src, bytes);

	ret = i2c_master_send(i2c, buf, bytes + 1);
	if (ret < 0)
		return ret;
	return 0;
}

int max8925_reg_read(struct i2c_client *i2c, int reg)
{
	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	unsigned char data = 0;
	int ret;

	mutex_lock(&chip->io_lock);
	ret = max8925_read_device(i2c, reg, 1, &data);
	mutex_unlock(&chip->io_lock);

	if (ret < 0)
		return ret;
	else
		return (int)data;
}
EXPORT_SYMBOL(max8925_reg_read);

int max8925_reg_write(struct i2c_client *i2c, int reg,
		unsigned char data)
{
	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&chip->io_lock);
	ret = max8925_write_device(i2c, reg, 1, &data);
	mutex_unlock(&chip->io_lock);

	return ret;
}
EXPORT_SYMBOL(max8925_reg_write);

int max8925_bulk_read(struct i2c_client *i2c, int reg,
		int count, unsigned char *buf)
{
	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&chip->io_lock);
	ret = max8925_read_device(i2c, reg, count, buf);
	mutex_unlock(&chip->io_lock);

	return ret;
}
EXPORT_SYMBOL(max8925_bulk_read);

int max8925_bulk_write(struct i2c_client *i2c, int reg,
		int count, unsigned char *buf)
{
	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&chip->io_lock);
	ret = max8925_write_device(i2c, reg, count, buf);
	mutex_unlock(&chip->io_lock);

	return ret;
}
EXPORT_SYMBOL(max8925_bulk_write);

int max8925_set_bits(struct i2c_client *i2c, int reg,
		unsigned char mask, unsigned char data)
{
	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	unsigned char value;
	int ret;

	mutex_lock(&chip->io_lock);
	ret = max8925_read_device(i2c, reg, 1, &value);
	if (ret < 0)
		goto out;
	value &= ~mask;
	value |= data;
	ret = max8925_write_device(i2c, reg, 1, &value);
out:
	mutex_unlock(&chip->io_lock);
	return ret;
}
EXPORT_SYMBOL(max8925_set_bits);


static const struct i2c_device_id max8925_id_table[] = {
	{ "max8925", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, max8925_id_table);

static int __devinit max8925_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	struct max8925_platform_data *pdata = client->dev.platform_data;
	static struct max8925_chip *chip;

	if (!pdata) {
		pr_info("%s: platform data is missing\n", __func__);
		return -EINVAL;
	}

	chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	chip->i2c = client;
	chip->dev = &client->dev;
	i2c_set_clientdata(client, chip);
	dev_set_drvdata(chip->dev, chip);
	mutex_init(&chip->io_lock);

	chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
	i2c_set_clientdata(chip->rtc, chip);

	chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
	i2c_set_clientdata(chip->adc, chip);

	max8925_device_init(chip, pdata);

	return 0;
}

static int __devexit max8925_remove(struct i2c_client *client)
{
	struct max8925_chip *chip = i2c_get_clientdata(client);

	max8925_device_exit(chip);
	i2c_unregister_device(chip->adc);
	i2c_unregister_device(chip->rtc);
	i2c_set_clientdata(chip->i2c, NULL);
	kfree(chip);
	return 0;
}

static struct i2c_driver max8925_driver = {
	.driver	= {
		.name	= "max8925",
		.owner	= THIS_MODULE,
	},
	.probe		= max8925_probe,
	.remove		= __devexit_p(max8925_remove),
	.id_table	= max8925_id_table,
};

static int __init max8925_i2c_init(void)
{
	int ret;

	ret = i2c_add_driver(&max8925_driver);
	if (ret != 0)
		pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
	return ret;
}
subsys_initcall(max8925_i2c_init);

static void __exit max8925_i2c_exit(void)
{
	i2c_del_driver(&max8925_driver);
}
module_exit(max8925_i2c_exit);

MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d50f8f33 HZ	1	/*
	2	* I2C driver for Maxim MAX8925
	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/max8925.h>
5a0e3ad6	16	#include <linux/slab.h>
d50f8f33	17
b13c0df5 HZ	18	#define RTC_I2C_ADDR 0x68
	19	#define ADC_I2C_ADDR 0x47
	20
d50f8f33 HZ	21	static inline int max8925_read_device(struct i2c_client *i2c,
	22	int reg, int bytes, void *dest)
	23	{
d50f8f33 HZ	24	int ret;
d50f8f33 HZ	25
b13c0df5 HZ	26	if (bytes > 1)
	27	ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest);
	28	else {
	29	ret = i2c_smbus_read_byte_data(i2c, reg);
	30	if (ret < 0)
	31	return ret;
	32	(unsigned char )dest = (unsigned char)ret;
	33	}
	34	return ret;
d50f8f33 HZ	35	}
	36
	37	static inline int max8925_write_device(struct i2c_client *i2c,
	38	int reg, int bytes, void *src)
	39	{
	40	unsigned char buf[bytes + 1];
	41	int ret;
	42
	43	buf[0] = (unsigned char)reg;
	44	memcpy(&buf[1], src, bytes);
	45
	46	ret = i2c_master_send(i2c, buf, bytes + 1);
	47	if (ret < 0)
	48	return ret;
	49	return 0;
	50	}
	51
	52	int max8925_reg_read(struct i2c_client *i2c, int reg)
	53	{
	54	struct max8925_chip *chip = i2c_get_clientdata(i2c);
b13c0df5	55	unsigned char data = 0;
d50f8f33 HZ	56	int ret;
	57
	58	mutex_lock(&chip->io_lock);
	59	ret = max8925_read_device(i2c, reg, 1, &data);
	60	mutex_unlock(&chip->io_lock);
	61
	62	if (ret < 0)
	63	return ret;
	64	else
	65	return (int)data;
	66	}
	67	EXPORT_SYMBOL(max8925_reg_read);
	68
	69	int max8925_reg_write(struct i2c_client *i2c, int reg,
	70	unsigned char data)
	71	{
	72	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	73	int ret;
	74
	75	mutex_lock(&chip->io_lock);
	76	ret = max8925_write_device(i2c, reg, 1, &data);
	77	mutex_unlock(&chip->io_lock);
	78
	79	return ret;
	80	}
	81	EXPORT_SYMBOL(max8925_reg_write);
	82
	83	int max8925_bulk_read(struct i2c_client *i2c, int reg,
	84	int count, unsigned char *buf)
	85	{
	86	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	87	int ret;
	88
	89	mutex_lock(&chip->io_lock);
	90	ret = max8925_read_device(i2c, reg, count, buf);
	91	mutex_unlock(&chip->io_lock);
	92
	93	return ret;
	94	}
	95	EXPORT_SYMBOL(max8925_bulk_read);
	96
	97	int max8925_bulk_write(struct i2c_client *i2c, int reg,
	98	int count, unsigned char *buf)
	99	{
	100	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	101	int ret;
	102
	103	mutex_lock(&chip->io_lock);
	104	ret = max8925_write_device(i2c, reg, count, buf);
	105	mutex_unlock(&chip->io_lock);
	106
	107	return ret;
	108	}
	109	EXPORT_SYMBOL(max8925_bulk_write);
	110
	111	int max8925_set_bits(struct i2c_client *i2c, int reg,
	112	unsigned char mask, unsigned char data)
	113	{
	114	struct max8925_chip *chip = i2c_get_clientdata(i2c);
	115	unsigned char value;
	116	int ret;
	117
	118	mutex_lock(&chip->io_lock);
	119	ret = max8925_read_device(i2c, reg, 1, &value);
120	if (ret < 0)
121	goto out;
122	value &= ~mask;
123	value \|= data;
124	ret = max8925_write_device(i2c, reg, 1, &value);
125	out:
126	mutex_unlock(&chip->io_lock);
127	return ret;
128	}
129	EXPORT_SYMBOL(max8925_set_bits);
130
131
132	static const struct i2c_device_id max8925_id_table[] = {
133	{ "max8925", 0 },
b13c0df5	134	{ },
d50f8f33 HZ	135	};
	136	MODULE_DEVICE_TABLE(i2c, max8925_id_table);
	137
	138	static int __devinit max8925_probe(struct i2c_client *client,
	139	const struct i2c_device_id *id)
	140	{
	141	struct max8925_platform_data *pdata = client->dev.platform_data;
b13c0df5	142	static struct max8925_chip *chip;
d50f8f33 HZ	143
	144	if (!pdata) {
	145	pr_info("%s: platform data is missing\n", __func__);
	146	return -EINVAL;
	147	}
d50f8f33 HZ	148
	149	chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
	150	if (chip == NULL)
	151	return -ENOMEM;
	152	chip->i2c = client;
d50f8f33	153	chip->dev = &client->dev;
b13c0df5	154	i2c_set_clientdata(client, chip);
d50f8f33	155	dev_set_drvdata(chip->dev, chip);
b13c0df5 HZ	156	mutex_init(&chip->io_lock);
	157
	158	chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
	159	i2c_set_clientdata(chip->rtc, chip);
	160
	161	chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
	162	i2c_set_clientdata(chip->adc, chip);
	163
d50f8f33 HZ	164	max8925_device_init(chip, pdata);
	165
	166	return 0;
	167	}
	168
	169	static int __devexit max8925_remove(struct i2c_client *client)
	170	{
	171	struct max8925_chip *chip = i2c_get_clientdata(client);
	172
	173	max8925_device_exit(chip);
b13c0df5 HZ	174	i2c_unregister_device(chip->adc);
b13c0df5 HZ	175	i2c_unregister_device(chip->rtc);
b13c0df5	176	i2c_set_clientdata(chip->i2c, NULL);
d50f8f33 HZ	177	kfree(chip);
	178	return 0;
	179	}
	180
	181	static struct i2c_driver max8925_driver = {
	182	.driver = {
	183	.name = "max8925",
	184	.owner = THIS_MODULE,
	185	},
	186	.probe = max8925_probe,
	187	.remove = __devexit_p(max8925_remove),
	188	.id_table = max8925_id_table,
	189	};
	190
	191	static int __init max8925_i2c_init(void)
	192	{
	193	int ret;
	194
	195	ret = i2c_add_driver(&max8925_driver);
	196	if (ret != 0)
	197	pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
	198	return ret;
	199	}
	200	subsys_initcall(max8925_i2c_init);
	201
	202	static void __exit max8925_i2c_exit(void)
	203	{
	204	i2c_del_driver(&max8925_driver);
	205	}
	206	module_exit(max8925_i2c_exit);
	207
	208	MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
	209	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	210	MODULE_LICENSE("GPL");