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/*
* Copyright (C) 2010 Freescale Semiconductor, Inc.
*
* 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
*
*/
/*!
* @file pmic/core/max17135.c
* @brief This file contains MAX17135 specific PMIC code. This implementaion
* may differ for each PMIC chip.
*
* @ingroup PMIC_CORE
*/
/*
* Includes
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/pmic_status.h>
#include <linux/mfd/max17135.h>
#include <asm/mach-types.h>
struct i2c_client *max17135_client;
static const unsigned short normal_i2c[] = {0x48, I2C_CLIENT_END};
int max17135_reg_read(int reg_num, unsigned int *reg_val)
{
int result;
if (max17135_client == NULL)
return PMIC_ERROR;
if ((reg_num == REG_MAX17135_EXT_TEMP) ||
(reg_num == REG_MAX17135_INT_TEMP)) {
result = i2c_smbus_read_word_data(max17135_client, reg_num);
if (result < 0) {
dev_err(&max17135_client->dev,
"Unable to read MAX17135 register via I2C\n");
return PMIC_ERROR;
}
/* Swap bytes for dword read */
result = (result >> 8) | ((result & 0xFF) << 8);
} else {
result = i2c_smbus_read_byte_data(max17135_client, reg_num);
if (result < 0) {
dev_err(&max17135_client->dev,
"Unable to read MAX17135 register via I2C\n");
return PMIC_ERROR;
}
}
*reg_val = result;
return PMIC_SUCCESS;
}
int max17135_reg_write(int reg_num, const unsigned int reg_val)
{
int result;
if (max17135_client == NULL)
return PMIC_ERROR;
result = i2c_smbus_write_byte_data(max17135_client, reg_num, reg_val);
if (result < 0) {
dev_err(&max17135_client->dev,
"Unable to write MAX17135 register via I2C\n");
return PMIC_ERROR;
}
return PMIC_SUCCESS;
}
static int max17135_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max17135 *max17135;
struct max17135_platform_data *pdata = client->dev.platform_data;
int ret = 0;
if (!pdata || !pdata->init)
return -ENODEV;
/* Create the PMIC data structure */
max17135 = kzalloc(sizeof(struct max17135), GFP_KERNEL);
if (max17135 == NULL) {
kfree(client);
return -ENOMEM;
}
/* Initialize the PMIC data structure */
i2c_set_clientdata(client, max17135);
max17135->dev = &client->dev;
max17135->i2c_client = client;
max17135_client = client;
if (pdata && pdata->init) {
ret = pdata->init(max17135);
if (ret != 0)
goto err;
}
dev_info(&client->dev, "PMIC MAX17135 for eInk display\n");
return ret;
err:
kfree(max17135);
return ret;
}
static int max17135_remove(struct i2c_client *i2c)
{
struct max17135 *max17135 = i2c_get_clientdata(i2c);
int i;
for (i = 0; i < ARRAY_SIZE(max17135->pdev); i++)
platform_device_unregister(max17135->pdev[i]);
kfree(max17135);
return 0;
}
static int max17135_suspend(struct i2c_client *client, pm_message_t state)
{
return 0;
}
static int max17135_resume(struct i2c_client *client)
{
return 0;
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int max17135_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
u8 chip_rev, chip_id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* detection */
if (i2c_smbus_read_byte_data(client,
REG_MAX17135_PRODUCT_REV) != 0) {
dev_err(&adapter->dev,
"Max17135 PMIC not found!\n");
return -ENODEV;
}
/* identification */
chip_rev = i2c_smbus_read_byte_data(client,
REG_MAX17135_PRODUCT_REV);
chip_id = i2c_smbus_read_byte_data(client,
REG_MAX17135_PRODUCT_ID);
if (chip_rev != 0x00 || chip_id != 0x4D) { /* identification failed */
dev_info(&adapter->dev,
"Unsupported chip (man_id=0x%02X, "
"chip_id=0x%02X).\n", chip_rev, chip_id);
return -ENODEV;
}
strlcpy(info->type, "max17135_sensor", I2C_NAME_SIZE);
return 0;
}
static const struct i2c_device_id max17135_id[] = {
{ "max17135", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max17135_id);
static struct i2c_driver max17135_driver = {
.driver = {
.name = "max17135",
.owner = THIS_MODULE,
},
.probe = max17135_probe,
.remove = max17135_remove,
.suspend = max17135_suspend,
.resume = max17135_resume,
.id_table = max17135_id,
.detect = max17135_detect,
.address_list = &normal_i2c,
};
static int __init max17135_init(void)
{
return i2c_add_driver(&max17135_driver);
}
static void __exit max17135_exit(void)
{
i2c_del_driver(&max17135_driver);
}
/*
* Module entry points
*/
subsys_initcall_sync(max17135_init);
module_exit(max17135_exit);
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