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/*
* 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");
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