forked from luck/tmp_suning_uos_patched
676e02d7a2
The MAX8998 chip have regulator and rtc features. The i2c slave address of regulator and rtc is different, so needs each i2c client on i2c operation functions. Also, this patch exports i2c operation functions instead of callback to make easy to read. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
159 lines
3.8 KiB
C
159 lines
3.8 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",
|
|
}
|
|
};
|
|
|
|
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_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_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_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;
|
|
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 },
|
|
{ "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");
|