[mirror_ubuntu-artful-kernel.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>

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