max8688.c
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/*
* Hardware monitoring driver for Maxim MAX8688
*
* Copyright (c) 2011 Ericsson AB.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include "pmbus.h"
#define MAX8688_MFR_VOUT_PEAK 0xd4
#define MAX8688_MFR_IOUT_PEAK 0xd5
#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
#define MAX8688_MFG_STATUS 0xd8
#define MAX8688_STATUS_OC_FAULT (1 << 4)
#define MAX8688_STATUS_OV_FAULT (1 << 5)
#define MAX8688_STATUS_OV_WARNING (1 << 8)
#define MAX8688_STATUS_UV_FAULT (1 << 9)
#define MAX8688_STATUS_UV_WARNING (1 << 10)
#define MAX8688_STATUS_UC_FAULT (1 << 11)
#define MAX8688_STATUS_OC_WARNING (1 << 12)
#define MAX8688_STATUS_OT_FAULT (1 << 13)
#define MAX8688_STATUS_OT_WARNING (1 << 14)
static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
{
int ret;
if (page)
return -ENXIO;
switch (reg) {
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
break;
case PMBUS_VIRT_READ_TEMP_MAX:
ret = pmbus_read_word_data(client, 0,
MAX8688_MFR_TEMPERATURE_PEAK);
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_RESET_TEMP_HISTORY:
ret = 0;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
switch (reg) {
case PMBUS_VIRT_RESET_VOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
0);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
0);
break;
case PMBUS_VIRT_RESET_TEMP_HISTORY:
ret = pmbus_write_word_data(client, 0,
MAX8688_MFR_TEMPERATURE_PEAK,
0xffff);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret = 0;
int mfg_status;
if (page > 0)
return -ENXIO;
switch (reg) {
case PMBUS_STATUS_VOUT:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_UV_WARNING)
ret |= PB_VOLTAGE_UV_WARNING;
if (mfg_status & MAX8688_STATUS_UV_FAULT)
ret |= PB_VOLTAGE_UV_FAULT;
if (mfg_status & MAX8688_STATUS_OV_WARNING)
ret |= PB_VOLTAGE_OV_WARNING;
if (mfg_status & MAX8688_STATUS_OV_FAULT)
ret |= PB_VOLTAGE_OV_FAULT;
break;
case PMBUS_STATUS_IOUT:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_UC_FAULT)
ret |= PB_IOUT_UC_FAULT;
if (mfg_status & MAX8688_STATUS_OC_WARNING)
ret |= PB_IOUT_OC_WARNING;
if (mfg_status & MAX8688_STATUS_OC_FAULT)
ret |= PB_IOUT_OC_FAULT;
break;
case PMBUS_STATUS_TEMPERATURE:
mfg_status = pmbus_read_word_data(client, 0,
MAX8688_MFG_STATUS);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX8688_STATUS_OT_WARNING)
ret |= PB_TEMP_OT_WARNING;
if (mfg_status & MAX8688_STATUS_OT_FAULT)
ret |= PB_TEMP_OT_FAULT;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static struct pmbus_driver_info max8688_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_OUT] = direct,
.m[PSC_VOLTAGE_IN] = 19995,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = -1,
.m[PSC_VOLTAGE_OUT] = 19995,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = -1,
.m[PSC_CURRENT_OUT] = 23109,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = -2,
.m[PSC_TEMPERATURE] = -7612,
.b[PSC_TEMPERATURE] = 335,
.R[PSC_TEMPERATURE] = -3,
.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = max8688_read_byte_data,
.read_word_data = max8688_read_word_data,
.write_word_data = max8688_write_word_data,
};
static int max8688_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
return pmbus_do_probe(client, id, &max8688_info);
}
static const struct i2c_device_id max8688_id[] = {
{"max8688", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, max8688_id);
/* This is the driver that will be inserted */
static struct i2c_driver max8688_driver = {
.driver = {
.name = "max8688",
},
.probe = max8688_probe,
.remove = pmbus_do_remove,
.id_table = max8688_id,
};
module_i2c_driver(max8688_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
MODULE_LICENSE("GPL");