159 строки
3.9 KiB
C
159 строки
3.9 KiB
C
/*
|
|
* max8698.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>
|
|
|
|
static struct mfd_cell max8998_devs[] = {
|
|
{
|
|
.name = "max8998-pmic",
|
|
}
|
|
};
|
|
|
|
static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest)
|
|
{
|
|
struct i2c_client *client = max8998->i2c_client;
|
|
int ret;
|
|
|
|
mutex_lock(&max8998->iolock);
|
|
ret = i2c_smbus_read_byte_data(client, reg);
|
|
mutex_unlock(&max8998->iolock);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret &= 0xff;
|
|
*dest = ret;
|
|
return 0;
|
|
}
|
|
|
|
static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value)
|
|
{
|
|
struct i2c_client *client = max8998->i2c_client;
|
|
int ret;
|
|
|
|
mutex_lock(&max8998->iolock);
|
|
ret = i2c_smbus_write_byte_data(client, reg, value);
|
|
mutex_unlock(&max8998->iolock);
|
|
return ret;
|
|
}
|
|
|
|
static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg,
|
|
u8 val, u8 mask)
|
|
{
|
|
struct i2c_client *client = max8998->i2c_client;
|
|
int ret;
|
|
|
|
mutex_lock(&max8998->iolock);
|
|
ret = i2c_smbus_read_byte_data(client, reg);
|
|
if (ret >= 0) {
|
|
u8 old_val = ret & 0xff;
|
|
u8 new_val = (val & mask) | (old_val & (~mask));
|
|
ret = i2c_smbus_write_byte_data(client, reg, new_val);
|
|
if (ret >= 0)
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&max8998->iolock);
|
|
return ret;
|
|
}
|
|
|
|
static int max8998_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
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_client = i2c;
|
|
max8998->dev_read = max8998_i2c_device_read;
|
|
max8998->dev_write = max8998_i2c_device_write;
|
|
max8998->dev_update = max8998_i2c_device_update;
|
|
mutex_init(&max8998->iolock);
|
|
|
|
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 },
|
|
{ }
|
|
};
|
|
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");
|