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hwmon: (pmbus) Add support for Maxim MAX34440/MAX34441
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Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
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Guenter Roeck committed Mar 15, 2011
1 parent dcb7d06 commit a3eeb45
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10 changes: 10 additions & 0 deletions drivers/hwmon/Kconfig
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Expand Up @@ -789,6 +789,16 @@ config SENSORS_MAX16064
This driver can also be built as a module. If so, the module will
be called max16064.

config SENSORS_MAX34440
tristate "Maxim MAX34440/MAX34441"
default n
help
If you say yes here you get hardware monitoring support for Maxim
MAX34440 and MAX34441.

This driver can also be built as a module. If so, the module will
be called max34440.

config SENSORS_MAX8688
tristate "Maxim MAX8688"
default n
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1 change: 1 addition & 0 deletions drivers/hwmon/Makefile
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Expand Up @@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
obj-$(CONFIG_PMBUS) += pmbus_core.o
obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o

ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
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199 changes: 199 additions & 0 deletions drivers/hwmon/max34440.c
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@@ -0,0 +1,199 @@
/*
* 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_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_get_status(struct i2c_client *client, int page, int reg)
{
int ret;
int mfg_status;

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,
.direct[PSC_VOLTAGE_IN] = true,
.direct[PSC_VOLTAGE_OUT] = true,
.direct[PSC_TEMPERATURE] = true,
.direct[PSC_CURRENT_OUT] = true,
.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,
.get_status = max34440_get_status,
},
[max34441] = {
.pages = 12,
.direct[PSC_VOLTAGE_IN] = true,
.direct[PSC_VOLTAGE_OUT] = true,
.direct[PSC_TEMPERATURE] = true,
.direct[PSC_CURRENT_OUT] = true,
.direct[PSC_FAN] = true,
.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,
.get_status = max34440_get_status,
},
};

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)
{
return pmbus_do_remove(client);
}

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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