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Commit f69316d6 authored by Edward A. James's avatar Edward A. James Committed by Guenter Roeck
Browse files

hwmon: (pmbus) Add IBM Common Form Factor (CFF) power supply driver 



Add the driver to monitor IBM CFF power supplies with hwmon over
pmbus.

Signed-off-by: default avatarEdward A. James <eajames@us.ibm.com>
[groeck: drop 'default n'; include bitops.h instead of jiffies.h]
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 74560e4a

drivers/hwmon/pmbus/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -37,6 +37,15 @@ config SENSORS_ADM1275 
	  This driver can also be built as a module. If so, the module will

	  be called adm1275.



config SENSORS_IBM_CFFPS

	tristate "IBM Common Form Factor Power Supply"

	help

	  If you say yes here you get hardware monitoring support for the IBM

	  Common Form Factor power supply.



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

	  be called ibm-cffps.



config SENSORS_IR35221

	tristate "Infineon IR35221"

	default n

drivers/hwmon/pmbus/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
obj-$(CONFIG_PMBUS)		+= pmbus_core.o

obj-$(CONFIG_SENSORS_PMBUS)	+= pmbus.o

obj-$(CONFIG_SENSORS_ADM1275)	+= adm1275.o

obj-$(CONFIG_SENSORS_IBM_CFFPS)	+= ibm-cffps.o

obj-$(CONFIG_SENSORS_IR35221)	+= ir35221.o

obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o

obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o

drivers/hwmon/pmbus/ibm-cffps.c

0 → 100644
+151 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2017 IBM Corp.

 *

 * 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.

 */



#include <linux/bitops.h>

#include <linux/device.h>

#include <linux/i2c.h>

#include <linux/module.h>



#include "pmbus.h"



/* STATUS_MFR_SPECIFIC bits */

#define CFFPS_MFR_FAN_FAULT			BIT(0)

#define CFFPS_MFR_THERMAL_FAULT			BIT(1)

#define CFFPS_MFR_OV_FAULT			BIT(2)

#define CFFPS_MFR_UV_FAULT			BIT(3)

#define CFFPS_MFR_PS_KILL			BIT(4)

#define CFFPS_MFR_OC_FAULT			BIT(5)

#define CFFPS_MFR_VAUX_FAULT			BIT(6)

#define CFFPS_MFR_CURRENT_SHARE_WARNING		BIT(7)



static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,

				    int reg)

{

	int rc, mfr;



	switch (reg) {

	case PMBUS_STATUS_VOUT:

	case PMBUS_STATUS_IOUT:

	case PMBUS_STATUS_TEMPERATURE:

	case PMBUS_STATUS_FAN_12:

		rc = pmbus_read_byte_data(client, page, reg);

		if (rc < 0)

			return rc;



		mfr = pmbus_read_byte_data(client, page,

					   PMBUS_STATUS_MFR_SPECIFIC);

		if (mfr < 0)

			/*

			 * Return the status register instead of an error,

			 * since we successfully read status.

			 */

			return rc;



		/* Add MFR_SPECIFIC bits to the standard pmbus status regs. */

		if (reg == PMBUS_STATUS_FAN_12) {

			if (mfr & CFFPS_MFR_FAN_FAULT)

				rc |= PB_FAN_FAN1_FAULT;

		} else if (reg == PMBUS_STATUS_TEMPERATURE) {

			if (mfr & CFFPS_MFR_THERMAL_FAULT)

				rc |= PB_TEMP_OT_FAULT;

		} else if (reg == PMBUS_STATUS_VOUT) {

			if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))

				rc |= PB_VOLTAGE_OV_FAULT;

			if (mfr & CFFPS_MFR_UV_FAULT)

				rc |= PB_VOLTAGE_UV_FAULT;

		} else if (reg == PMBUS_STATUS_IOUT) {

			if (mfr & CFFPS_MFR_OC_FAULT)

				rc |= PB_IOUT_OC_FAULT;

			if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)

				rc |= PB_CURRENT_SHARE_FAULT;

		}

		break;

	default:

		rc = -ENODATA;

		break;

	}



	return rc;

}



static int ibm_cffps_read_word_data(struct i2c_client *client, int page,

				    int reg)

{

	int rc, mfr;



	switch (reg) {

	case PMBUS_STATUS_WORD:

		rc = pmbus_read_word_data(client, page, reg);

		if (rc < 0)

			return rc;



		mfr = pmbus_read_byte_data(client, page,

					   PMBUS_STATUS_MFR_SPECIFIC);

		if (mfr < 0)

			/*

			 * Return the status register instead of an error,

			 * since we successfully read status.

			 */

			return rc;



		if (mfr & CFFPS_MFR_PS_KILL)

			rc |= PB_STATUS_OFF;

		break;

	default:

		rc = -ENODATA;

		break;

	}



	return rc;

}



static struct pmbus_driver_info ibm_cffps_info = {

	.pages = 1,

	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |

		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |

		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |

		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |

		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,

	.read_byte_data = ibm_cffps_read_byte_data,

	.read_word_data = ibm_cffps_read_word_data,

};



static int ibm_cffps_probe(struct i2c_client *client,

			   const struct i2c_device_id *id)

{

	return pmbus_do_probe(client, id, &ibm_cffps_info);

}



static const struct i2c_device_id ibm_cffps_id[] = {

	{ "ibm_cffps1", 1 },

	{}

};

MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);



static const struct of_device_id ibm_cffps_of_match[] = {

	{ .compatible = "ibm,cffps1" },

	{}

};

MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);



static struct i2c_driver ibm_cffps_driver = {

	.driver = {

		.name = "ibm-cffps",

		.of_match_table = ibm_cffps_of_match,

	},

	.probe = ibm_cffps_probe,

	.remove = pmbus_do_remove,

	.id_table = ibm_cffps_id,

};



module_i2c_driver(ibm_cffps_driver);



MODULE_AUTHOR("Eddie James");

MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");

MODULE_LICENSE("GPL");