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/*
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*!
* @file max8660.c
* @brief Driver for max8660
*
* @ingroup pmic
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/i2c.h>
#include <linux/mfd/mc9s08dz60/pmic.h>
#include <asm/uaccess.h>
#include "mcu_pmic_core.h"
#include "max8660.h"
/* I2C bus id and device address of mcu */
#define I2C1_BUS 0
#define MAX8660_I2C_ADDR 0x68
static struct i2c_client *max8660_i2c_client;
/* reg names for max8660
REG_MAX8660_OUTPUT_ENABLE_1,
REG_MAX8660_OUTPUT_ENABLE_2,
REG_MAX8660_VOLT__CHANGE_1,
REG_MAX8660_V3_TARGET_VOLT_1,
REG_MAX8660_V3_TARGET_VOLT_2,
REG_MAX8660_V4_TARGET_VOLT_1,
REG_MAX8660_V4_TARGET_VOLT_2,
REG_MAX8660_V5_TARGET_VOLT_1,
REG_MAX8660_V5_TARGET_VOLT_2,
REG_MAX8660_V6V7_TARGET_VOLT,
REG_MAX8660_FORCE_PWM
*/
/* save down the reg values for the device is write only */
static u8 max8660_reg_value_table[] = {
0x0, 0x0, 0x0, 0x17, 0x17, 0x1F, 0x1F, 0x04, 0x04, 0x0, 0x0
};
static int max8660_dev_present;
int is_max8660_present(void)
{
return max8660_dev_present;
}
int max8660_get_buffered_reg_val(int reg_name, u8 *value)
{
if (!max8660_dev_present)
return -1;
/* outof range */
if (reg_name < REG_MAX8660_OUTPUT_ENABLE_1
|| reg_name > REG_MAX8660_FORCE_PWM)
return -1;
*value =
max8660_reg_value_table[reg_name - REG_MAX8660_OUTPUT_ENABLE_1];
return 0;
}
int max8660_save_buffered_reg_val(int reg_name, u8 value)
{
/* outof range */
if (reg_name < REG_MAX8660_OUTPUT_ENABLE_1
|| reg_name > REG_MAX8660_FORCE_PWM)
return -1;
max8660_reg_value_table[reg_name - REG_MAX8660_OUTPUT_ENABLE_1] = value;
return 0;
}
int max8660_write_reg(u8 reg, u8 value)
{
if (max8660_dev_present && (i2c_smbus_write_byte_data(
max8660_i2c_client, reg, value) >= 0))
return 0;
return -1;
}
/*!
* max8660 I2C attach function
*
* @param adapter struct i2c_client *
* @return 0 for max8660 successfully detected
*/
static int max8660_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int retval;
max8660_i2c_client = client;
retval = i2c_smbus_write_byte_data(max8660_i2c_client,
MAX8660_OUTPUT_ENABLE_1, 0);
if (retval == 0) {
max8660_dev_present = 1;
pr_info("max8660 probed !\n");
} else {
max8660_dev_present = 0;
pr_info("max8660 not detected!\n");
}
return retval;
}
/*!
* max8660 I2C detach function
*
* @param client struct i2c_client *
* @return 0
*/
static int max8660_remove(struct i2c_client *client)
{
return 0;
}
static const struct i2c_device_id max8660_id[] = {
{ "max8660", 0 },
{},
};
MODULE_DEVICE_TABLE(i2c, max8660_id);
static struct i2c_driver max8660_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "max8660",},
.probe = max8660_probe,
.remove = max8660_remove,
.id_table = max8660_id,
};
/* called by pmic core when init*/
int max8660_init(void)
{
int err;
err = i2c_add_driver(&max8660_i2c_driver);
return err;
}
void max8660_exit(void)
{
i2c_del_driver(&max8660_i2c_driver);
}
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