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/*
* Hardware monitoring driver for Maxim MAX34440/MAX34441
*
* 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"
enum chips { max34440, max34441 };
#define MAX34440_MFR_VOUT_PEAK 0xd4
#define MAX34440_MFR_IOUT_PEAK 0xd5
#define MAX34440_MFR_TEMPERATURE_PEAK 0xd6
#define MAX34440_STATUS_OC_WARN (1 << 0)
#define MAX34440_STATUS_OC_FAULT (1 << 1)
#define MAX34440_STATUS_OT_FAULT (1 << 5)
#define MAX34440_STATUS_OT_WARN (1 << 6)
static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
{
int ret;
switch (reg) {
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, page,
MAX34440_MFR_VOUT_PEAK);
break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, page,
MAX34440_MFR_IOUT_PEAK);
break;
case PMBUS_VIRT_READ_TEMP_MAX:
ret = pmbus_read_word_data(client, page,
MAX34440_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 max34440_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, page,
MAX34440_MFR_VOUT_PEAK, 0);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
ret = pmbus_write_word_data(client, page,
MAX34440_MFR_IOUT_PEAK, 0);
break;
case PMBUS_VIRT_RESET_TEMP_HISTORY:
ret = pmbus_write_word_data(client, page,
MAX34440_MFR_TEMPERATURE_PEAK,
0x8000);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret = 0;
int mfg_status;
if (page >= 0) {
ret = pmbus_set_page(client, page);
if (ret < 0)
return ret;
}
switch (reg) {
case PMBUS_STATUS_IOUT:
mfg_status = pmbus_read_word_data(client, 0,
PMBUS_STATUS_MFR_SPECIFIC);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX34440_STATUS_OC_WARN)
ret |= PB_IOUT_OC_WARNING;
if (mfg_status & MAX34440_STATUS_OC_FAULT)
ret |= PB_IOUT_OC_FAULT;
break;
case PMBUS_STATUS_TEMPERATURE:
mfg_status = pmbus_read_word_data(client, 0,
PMBUS_STATUS_MFR_SPECIFIC);
if (mfg_status < 0)
return mfg_status;
if (mfg_status & MAX34440_STATUS_OT_WARN)
ret |= PB_TEMP_OT_WARNING;
if (mfg_status & MAX34440_STATUS_OT_FAULT)
ret |= PB_TEMP_OT_FAULT;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static struct pmbus_driver_info max34440_info[] = {
[max34440] = {
.pages = 14,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_OUT] = direct,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 3, /* R = 0 in datasheet reflects mV */
.m[PSC_VOLTAGE_OUT] = 1,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = 3, /* R = 0 in datasheet reflects mV */
.m[PSC_CURRENT_OUT] = 1,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = 3, /* R = 0 in datasheet reflects mA */
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 2,
.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = max34440_read_byte_data,
.read_word_data = max34440_read_word_data,
.write_word_data = max34440_write_word_data,
},
[max34441] = {
.pages = 12,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_FAN] = direct,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 3,
.m[PSC_VOLTAGE_OUT] = 1,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = 3,
.m[PSC_CURRENT_OUT] = 1,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = 3,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 2,
.m[PSC_FAN] = 1,
.b[PSC_FAN] = 0,
.R[PSC_FAN] = 0,
.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
.func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = max34440_read_byte_data,
.read_word_data = max34440_read_word_data,
.write_word_data = max34440_write_word_data,
},
};
static int max34440_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
}
static int max34440_remove(struct i2c_client *client)
{
pmbus_do_remove(client);
return 0;
}
static const struct i2c_device_id max34440_id[] = {
{"max34440", max34440},
{"max34441", max34441},
{}
};
MODULE_DEVICE_TABLE(i2c, max34440_id);
/* This is the driver that will be inserted */
static struct i2c_driver max34440_driver = {
.driver = {
.name = "max34440",
},
.probe = max34440_probe,
.remove = max34440_remove,
.id_table = max34440_id,
};
static int __init max34440_init(void)
{
return i2c_add_driver(&max34440_driver);
}
static void __exit max34440_exit(void)
{
i2c_del_driver(&max34440_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
MODULE_LICENSE("GPL");
module_init(max34440_init);
module_exit(max34440_exit);
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