[deliverable/linux.git] / drivers / mfd / max8998.c

/*
 * max8998.c - mfd core driver for the Maxim 8998
 *
 *  Copyright (C) 2009-2010 Samsung Electronics
 *  Kyungmin Park <kyungmin.park@samsung.com>
 *  Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>

#define RTC_I2C_ADDR		(0x0c >> 1)

static struct mfd_cell max8998_devs[] = {
	{
		.name = "max8998-pmic",
	}, {
		.name = "max8998-rtc",
	},
};

int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_byte_data(i2c, reg);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
		return ret;

	ret &= 0xff;
	*dest = ret;
	return 0;
}
EXPORT_SYMBOL(max8998_read_reg);

int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
		return ret;

	return 0;
}
EXPORT_SYMBOL(max8998_bulk_read);

int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_write_byte_data(i2c, reg, value);
	mutex_unlock(&max8998->iolock);
	return ret;
}
EXPORT_SYMBOL(max8998_write_reg);

int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
	mutex_unlock(&max8998->iolock);
	if (ret < 0)
		return ret;

	return 0;
}
EXPORT_SYMBOL(max8998_bulk_write);

int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	int ret;

	mutex_lock(&max8998->iolock);
	ret = i2c_smbus_read_byte_data(i2c, reg);
	if (ret >= 0) {
		u8 old_val = ret & 0xff;
		u8 new_val = (val & mask) | (old_val & (~mask));
		ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
		if (ret >= 0)
			ret = 0;
	}
	mutex_unlock(&max8998->iolock);
	return ret;
}
EXPORT_SYMBOL(max8998_update_reg);

static int max8998_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct max8998_platform_data *pdata = i2c->dev.platform_data;
	struct max8998_dev *max8998;
	int ret = 0;

	max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
	if (max8998 == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max8998);
	max8998->dev = &i2c->dev;
	max8998->i2c = i2c;
	max8998->irq = i2c->irq;
	if (pdata) {
		max8998->ono = pdata->ono;
		max8998->irq_base = pdata->irq_base;
	}
	mutex_init(&max8998->iolock);

	max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
	i2c_set_clientdata(max8998->rtc, max8998);

	max8998_irq_init(max8998);

	ret = mfd_add_devices(max8998->dev, -1,
			      max8998_devs, ARRAY_SIZE(max8998_devs),
			      NULL, 0);
	if (ret < 0)
		goto err;

	return ret;

err:
	mfd_remove_devices(max8998->dev);
	kfree(max8998);
	return ret;
}

static int max8998_i2c_remove(struct i2c_client *i2c)
{
	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

	mfd_remove_devices(max8998->dev);
	kfree(max8998);

	return 0;
}

static const struct i2c_device_id max8998_i2c_id[] = {
	{ "max8998", 0 },
	{ "lp3974", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);

static struct i2c_driver max8998_i2c_driver = {
	.driver = {
		   .name = "max8998",
		   .owner = THIS_MODULE,
	},
	.probe = max8998_i2c_probe,
	.remove = max8998_i2c_remove,
	.id_table = max8998_i2c_id,
};

static int __init max8998_i2c_init(void)
{
	return i2c_add_driver(&max8998_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max8998_i2c_init);

static void __exit max8998_i2c_exit(void)
{
	i2c_del_driver(&max8998_i2c_driver);
}
module_exit(max8998_i2c_exit);

MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
156f2528	1	/*
2c7e6f57	2	* max8998.c - mfd core driver for the Maxim 8998
156f2528 KP	3	*
	4	* Copyright (C) 2009-2010 Samsung Electronics
	5	* Kyungmin Park <kyungmin.park@samsung.com>
	6	* Marek Szyprowski <m.szyprowski@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/mutex.h>
	29	#include <linux/mfd/core.h>
	30	#include <linux/mfd/max8998.h>
	31	#include <linux/mfd/max8998-private.h>
	32
9b16c0a4 JS	33	#define RTC_I2C_ADDR (0x0c >> 1)
9b16c0a4 JS	34
156f2528 KP	35	static struct mfd_cell max8998_devs[] = {
	36	{
	37	.name = "max8998-pmic",
9b16c0a4 JS	38	}, {
	39	.name = "max8998-rtc",
	40	},
156f2528 KP	41	};
156f2528 KP	42
676e02d7	43	int max8998_read_reg(struct i2c_client i2c, u8 reg, u8 dest)
156f2528	44	{
676e02d7	45	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
156f2528 KP	46	int ret;
	47
	48	mutex_lock(&max8998->iolock);
676e02d7	49	ret = i2c_smbus_read_byte_data(i2c, reg);
156f2528 KP	50	mutex_unlock(&max8998->iolock);
	51	if (ret < 0)
	52	return ret;
	53
	54	ret &= 0xff;
	55	*dest = ret;
	56	return 0;
	57	}
676e02d7	58	EXPORT_SYMBOL(max8998_read_reg);
156f2528	59
2c7e6f57 JS	60	int max8998_bulk_read(struct i2c_client i2c, u8 reg, int count, u8 buf)
	61	{
	62	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	63	int ret;
	64
	65	mutex_lock(&max8998->iolock);
	66	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
	67	mutex_unlock(&max8998->iolock);
	68	if (ret < 0)
	69	return ret;
	70
	71	return 0;
	72	}
	73	EXPORT_SYMBOL(max8998_bulk_read);
	74
676e02d7	75	int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
156f2528	76	{
676e02d7	77	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
156f2528 KP	78	int ret;
	79
	80	mutex_lock(&max8998->iolock);
676e02d7	81	ret = i2c_smbus_write_byte_data(i2c, reg, value);
156f2528 KP	82	mutex_unlock(&max8998->iolock);
	83	return ret;
	84	}
676e02d7	85	EXPORT_SYMBOL(max8998_write_reg);
156f2528	86
9b16c0a4 JS	87	int max8998_bulk_write(struct i2c_client i2c, u8 reg, int count, u8 buf)
	88	{
	89	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	90	int ret;
	91
	92	mutex_lock(&max8998->iolock);
	93	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
	94	mutex_unlock(&max8998->iolock);
	95	if (ret < 0)
	96	return ret;
	97
	98	return 0;
	99	}
	100	EXPORT_SYMBOL(max8998_bulk_write);
	101
676e02d7	102	int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
156f2528	103	{
676e02d7	104	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
156f2528 KP	105	int ret;
	106
	107	mutex_lock(&max8998->iolock);
676e02d7	108	ret = i2c_smbus_read_byte_data(i2c, reg);
156f2528 KP	109	if (ret >= 0) {
	110	u8 old_val = ret & 0xff;
	111	u8 new_val = (val & mask) \| (old_val & (~mask));
676e02d7	112	ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
156f2528 KP	113	if (ret >= 0)
	114	ret = 0;
	115	}
	116	mutex_unlock(&max8998->iolock);
	117	return ret;
	118	}
676e02d7	119	EXPORT_SYMBOL(max8998_update_reg);
156f2528 KP	120
	121	static int max8998_i2c_probe(struct i2c_client *i2c,
	122	const struct i2c_device_id *id)
	123	{
2c7e6f57	124	struct max8998_platform_data *pdata = i2c->dev.platform_data;
156f2528 KP	125	struct max8998_dev *max8998;
	126	int ret = 0;
	127
	128	max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
8f1f151e	129	if (max8998 == NULL)
156f2528	130	return -ENOMEM;
156f2528 KP	131
	132	i2c_set_clientdata(i2c, max8998);
	133	max8998->dev = &i2c->dev;
676e02d7	134	max8998->i2c = i2c;
2c7e6f57 JS	135	max8998->irq = i2c->irq;
	136	if (pdata) {
	137	max8998->ono = pdata->ono;
	138	max8998->irq_base = pdata->irq_base;
	139	}
156f2528 KP	140	mutex_init(&max8998->iolock);
156f2528 KP	141
9b16c0a4 JS	142	max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
	143	i2c_set_clientdata(max8998->rtc, max8998);
	144
2c7e6f57 JS	145	max8998_irq_init(max8998);
2c7e6f57 JS	146
156f2528 KP	147	ret = mfd_add_devices(max8998->dev, -1,
	148	max8998_devs, ARRAY_SIZE(max8998_devs),
	149	NULL, 0);
	150	if (ret < 0)
	151	goto err;
	152
	153	return ret;
	154
	155	err:
	156	mfd_remove_devices(max8998->dev);
	157	kfree(max8998);
	158	return ret;
	159	}
	160
	161	static int max8998_i2c_remove(struct i2c_client *i2c)
	162	{
	163	struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
	164
	165	mfd_remove_devices(max8998->dev);
	166	kfree(max8998);
	167
	168	return 0;
	169	}
	170
	171	static const struct i2c_device_id max8998_i2c_id[] = {
f8539ddc KP	172	{ "max8998", 0 },
	173	{ "lp3974", 0 },
	174	{ }
156f2528 KP	175	};
	176	MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
	177
	178	static struct i2c_driver max8998_i2c_driver = {
	179	.driver = {
	180	.name = "max8998",
	181	.owner = THIS_MODULE,
	182	},
	183	.probe = max8998_i2c_probe,
	184	.remove = max8998_i2c_remove,
	185	.id_table = max8998_i2c_id,
	186	};
	187
	188	static int __init max8998_i2c_init(void)
	189	{
	190	return i2c_add_driver(&max8998_i2c_driver);
	191	}
	192	/* init early so consumer devices can complete system boot */
	193	subsys_initcall(max8998_i2c_init);
	194
	195	static void __exit max8998_i2c_exit(void)
	196	{
	197	i2c_del_driver(&max8998_i2c_driver);
	198	}
	199	module_exit(max8998_i2c_exit);
	200
	201	MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
	202	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	203	MODULE_LICENSE("GPL");