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hwmon: (pmbus) Add support for MAX20751

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MAX20751 is a multiphase power controller with internal buck converter.
It uses VR12.0 to report the output voltage. This requires an explicit
driver, since the VR version can not be auto-detected.

The chip supports a manufacturer specific command to fine-tune the output
voltage.  This command is not currently supported.

Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Guenter Roeck 2015-06-08 11:15:23 -07:00
commit 1f61cab8a7
5 changed files with 159 additions and 0 deletions
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10
drivers/hwmon/pmbus/Kconfig
View file

@ -73,6 +73,16 @@ config SENSORS_MAX16064
This driver can also be built as a module. If so, the module will
be called max16064.
config SENSORS_MAX20751
tristate "Maxim MAX20751"
default n
help
If you say yes here you get hardware monitoring support for Maxim
MAX20751.
This driver can also be built as a module. If so, the module will
be called max20751.
config SENSORS_MAX34440
tristate "Maxim MAX34440 and compatibles"
default n

1
drivers/hwmon/pmbus/Makefile
View file

@ -8,6 +8,7 @@ obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o

64
drivers/hwmon/pmbus/max20751.c Normal file
View file

@ -0,0 +1,64 @@
/*
* Hardware monitoring driver for Maxim MAX20751
*
* Copyright (c) 2015 Guenter Roeck
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include "pmbus.h"
static struct pmbus_driver_info max20751_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
.vrm_version = vr12,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_POWER] = linear,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT,
};
static int max20751_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
return pmbus_do_probe(client, id, &max20751_info);
}
static const struct i2c_device_id max20751_id[] = {
{"max20751", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, max20751_id);
static struct i2c_driver max20751_driver = {
.driver = {
.name = "max20751",
},
.probe = max20751_probe,
.remove = pmbus_do_remove,
.id_table = max20751_id,
};
module_i2c_driver(max20751_driver);
MODULE_AUTHOR("Guenter Roeck <[email protected]>");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX20751");
MODULE_LICENSE("GPL");