[linux-2.6-block.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 max8925_dt_init(struct device_node *np, struct device *dev,
			   struct max8925_platform_data *pdata)
{
	int ret;

	ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq);
	if (ret) {
		dev_err(dev, "Not found maxim,tsc-irq property\n");
		return -EINVAL;
	}
	return 0;
}

static int 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;
	struct device_node *node = client->dev.of_node;

	if (node && !pdata) {
		/* parse DT to get platform data */
		pdata = devm_kzalloc(&client->dev,
				     sizeof(struct max8925_platform_data),
				     GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;

		if (max8925_dt_init(node, &client->dev, pdata))
			return -EINVAL;
	} else 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);

	device_init_wakeup(&client->dev, 1);

	max8925_device_init(chip, pdata);

	return 0;
}

static int 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);
	kfree(chip);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int max8925_suspend(struct device *dev)
{
	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	struct max8925_chip *chip = i2c_get_clientdata(client);

	if (device_may_wakeup(dev) && chip->wakeup_flag)
		enable_irq_wake(chip->core_irq);
	return 0;
}

static int max8925_resume(struct device *dev)
{
	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	struct max8925_chip *chip = i2c_get_clientdata(client);

	if (device_may_wakeup(dev) && chip->wakeup_flag)
		disable_irq_wake(chip->core_irq);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);

static const struct of_device_id max8925_dt_ids[] = {
	{ .compatible = "maxim,max8925", },
	{},
};
MODULE_DEVICE_TABLE(of, max8925_dt_ids);

static struct i2c_driver max8925_driver = {
	.driver	= {
		.name	= "max8925",
		.owner	= THIS_MODULE,
		.pm     = &max8925_pm_ops,
		.of_match_table = of_match_ptr(max8925_dt_ids),
	},
	.probe		= max8925_probe,
	.remove		= 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
4e405ae2 QX	138	static int max8925_dt_init(struct device_node np, struct device dev,
	139	struct max8925_platform_data *pdata)
	140	{
	141	int ret;
	142
	143	ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq);
	144	if (ret) {
	145	dev_err(dev, "Not found maxim,tsc-irq property\n");
	146	return -EINVAL;
	147	}
	148	return 0;
	149	}
	150
f791be49	151	static int max8925_probe(struct i2c_client *client,
d50f8f33 HZ	152	const struct i2c_device_id *id)
	153	{
	154	struct max8925_platform_data *pdata = client->dev.platform_data;
b13c0df5	155	static struct max8925_chip *chip;
4e405ae2 QX	156	struct device_node *node = client->dev.of_node;
	157
	158	if (node && !pdata) {
	159	/* parse DT to get platform data */
	160	pdata = devm_kzalloc(&client->dev,
	161	sizeof(struct max8925_platform_data),
	162	GFP_KERNEL);
	163	if (!pdata)
	164	return -ENOMEM;
	165
	166	if (max8925_dt_init(node, &client->dev, pdata))
	167	return -EINVAL;
	168	} else if (!pdata) {
d50f8f33 HZ	169	pr_info("%s: platform data is missing\n", __func__);
	170	return -EINVAL;
	171	}
d50f8f33 HZ	172
	173	chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
	174	if (chip == NULL)
	175	return -ENOMEM;
	176	chip->i2c = client;
d50f8f33	177	chip->dev = &client->dev;
b13c0df5	178	i2c_set_clientdata(client, chip);
d50f8f33	179	dev_set_drvdata(chip->dev, chip);
b13c0df5 HZ	180	mutex_init(&chip->io_lock);
	181
	182	chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
	183	i2c_set_clientdata(chip->rtc, chip);
	184
	185	chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
	186	i2c_set_clientdata(chip->adc, chip);
	187
ba74e80e KL	188	device_init_wakeup(&client->dev, 1);
ba74e80e KL	189
d50f8f33 HZ	190	max8925_device_init(chip, pdata);
	191
	192	return 0;
	193	}
	194
4740f73f	195	static int max8925_remove(struct i2c_client *client)
d50f8f33 HZ	196	{
	197	struct max8925_chip *chip = i2c_get_clientdata(client);
	198
	199	max8925_device_exit(chip);
b13c0df5 HZ	200	i2c_unregister_device(chip->adc);
b13c0df5 HZ	201	i2c_unregister_device(chip->rtc);
d50f8f33 HZ	202	kfree(chip);
	203	return 0;
	204	}
	205
ba74e80e KL	206	#ifdef CONFIG_PM_SLEEP
	207	static int max8925_suspend(struct device *dev)
	208	{
	209	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	210	struct max8925_chip *chip = i2c_get_clientdata(client);
	211
	212	if (device_may_wakeup(dev) && chip->wakeup_flag)
	213	enable_irq_wake(chip->core_irq);
	214	return 0;
	215	}
	216
	217	static int max8925_resume(struct device *dev)
	218	{
	219	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	220	struct max8925_chip *chip = i2c_get_clientdata(client);
	221
	222	if (device_may_wakeup(dev) && chip->wakeup_flag)
	223	disable_irq_wake(chip->core_irq);
	224	return 0;
	225	}
	226	#endif
	227
	228	static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);
	229
4e405ae2 QX	230	static const struct of_device_id max8925_dt_ids[] = {
	231	{ .compatible = "maxim,max8925", },
	232	{},
	233	};
	234	MODULE_DEVICE_TABLE(of, max8925_dt_ids);
	235
d50f8f33 HZ	236	static struct i2c_driver max8925_driver = {
	237	.driver = {
	238	.name = "max8925",
	239	.owner = THIS_MODULE,
ba74e80e	240	.pm = &max8925_pm_ops,
4e405ae2	241	.of_match_table = of_match_ptr(max8925_dt_ids),
d50f8f33 HZ	242	},
d50f8f33 HZ	243	.probe = max8925_probe,
84449216	244	.remove = max8925_remove,
d50f8f33 HZ	245	.id_table = max8925_id_table,
	246	};
	247
	248	static int __init max8925_i2c_init(void)
	249	{
	250	int ret;
d50f8f33 HZ	251	ret = i2c_add_driver(&max8925_driver);
	252	if (ret != 0)
	253	pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
	254	return ret;
	255	}
	256	subsys_initcall(max8925_i2c_init);
	257
	258	static void __exit max8925_i2c_exit(void)
	259	{
	260	i2c_del_driver(&max8925_driver);
	261	}
	262	module_exit(max8925_i2c_exit);
	263
	264	MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
	265	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	266	MODULE_LICENSE("GPL");