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Commit 8ea3238b authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (pmbus) Add support for Maxim MAX8688 



Signed-off-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
parent 44f5a408

drivers/hwmon/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -779,6 +779,16 @@ config SENSORS_PMBUS 
	  This driver can also be built as a module. If so, the module will

	  be called pmbus.



config SENSORS_MAX8688

	tristate "Maxim MAX8688"

	default n

	help

	  If you say yes here you get hardware monitoring support for Maxim

	  MAX8688.



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

	  be called max8688.



endif # PMBUS



config SENSORS_SHT15

drivers/hwmon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -117,6 +117,7 @@ obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o 
# PMBus drivers

obj-$(CONFIG_PMBUS)		+= pmbus_core.o

obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o

obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o



ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)

EXTRA_CFLAGS += -DDEBUG

drivers/hwmon/max8688.c

0 → 100644
+158 −0
Original line number Diff line number Diff line 
/*

 * 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_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_get_status(struct i2c_client *client, int page, int reg)

{

	int ret = 0;

	int mfg_status;



	if (page)

		return -EINVAL;



	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,

	.direct[PSC_VOLTAGE_IN] = true,

	.direct[PSC_VOLTAGE_OUT] = true,

	.direct[PSC_TEMPERATURE] = true,

	.direct[PSC_CURRENT_OUT] = true,

	.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,

	.get_status = max8688_get_status,

};



static int max8688_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{

	return pmbus_do_probe(client, id, &max8688_info);

}



static int max8688_remove(struct i2c_client *client)

{

	return pmbus_do_remove(client);

}



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 = max8688_remove,

	.id_table = max8688_id,

};



static int __init max8688_init(void)

{

	return i2c_add_driver(&max8688_driver);

}



static void __exit max8688_exit(void)

{

	i2c_del_driver(&max8688_driver);

}



MODULE_AUTHOR("Guenter Roeck");

MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");

MODULE_LICENSE("GPL");

module_init(max8688_init);

module_exit(max8688_exit);