159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/*
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* max8698.c - mfd core driver for the Maxim 8998
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*
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* Copyright (C) 2009-2010 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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static struct mfd_cell max8998_devs[] = {
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{
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.name = "max8998-pmic",
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}
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};
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static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest)
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{
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struct i2c_client *client = max8998->i2c_client;
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_read_byte_data(client, reg);
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mutex_unlock(&max8998->iolock);
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if (ret < 0)
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return ret;
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ret &= 0xff;
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*dest = ret;
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return 0;
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}
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static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value)
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{
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struct i2c_client *client = max8998->i2c_client;
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_write_byte_data(client, reg, value);
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mutex_unlock(&max8998->iolock);
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return ret;
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}
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static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg,
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u8 val, u8 mask)
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{
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struct i2c_client *client = max8998->i2c_client;
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int ret;
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mutex_lock(&max8998->iolock);
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret >= 0) {
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u8 old_val = ret & 0xff;
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u8 new_val = (val & mask) | (old_val & (~mask));
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ret = i2c_smbus_write_byte_data(client, reg, new_val);
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if (ret >= 0)
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ret = 0;
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}
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mutex_unlock(&max8998->iolock);
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return ret;
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}
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static int max8998_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct max8998_dev *max8998;
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int ret = 0;
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max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
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if (max8998 == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, max8998);
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max8998->dev = &i2c->dev;
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max8998->i2c_client = i2c;
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max8998->dev_read = max8998_i2c_device_read;
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max8998->dev_write = max8998_i2c_device_write;
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max8998->dev_update = max8998_i2c_device_update;
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mutex_init(&max8998->iolock);
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ret = mfd_add_devices(max8998->dev, -1,
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max8998_devs, ARRAY_SIZE(max8998_devs),
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NULL, 0);
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if (ret < 0)
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goto err;
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return ret;
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err:
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mfd_remove_devices(max8998->dev);
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kfree(max8998);
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return ret;
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}
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static int max8998_i2c_remove(struct i2c_client *i2c)
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{
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struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
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mfd_remove_devices(max8998->dev);
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kfree(max8998);
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return 0;
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}
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static const struct i2c_device_id max8998_i2c_id[] = {
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{ "max8998", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
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static struct i2c_driver max8998_i2c_driver = {
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.driver = {
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.name = "max8998",
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.owner = THIS_MODULE,
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},
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.probe = max8998_i2c_probe,
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.remove = max8998_i2c_remove,
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.id_table = max8998_i2c_id,
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};
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static int __init max8998_i2c_init(void)
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{
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return i2c_add_driver(&max8998_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(max8998_i2c_init);
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static void __exit max8998_i2c_exit(void)
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{
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i2c_del_driver(&max8998_i2c_driver);
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}
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module_exit(max8998_i2c_exit);
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MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
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MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
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MODULE_LICENSE("GPL");
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