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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f69316d62c
Add the driver to monitor IBM CFF power supplies with hwmon over pmbus. Signed-off-by: Edward A. James <eajames@us.ibm.com> [groeck: drop 'default n'; include bitops.h instead of jiffies.h] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/*
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* Copyright 2017 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include "pmbus.h"
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/* STATUS_MFR_SPECIFIC bits */
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#define CFFPS_MFR_FAN_FAULT BIT(0)
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#define CFFPS_MFR_THERMAL_FAULT BIT(1)
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#define CFFPS_MFR_OV_FAULT BIT(2)
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#define CFFPS_MFR_UV_FAULT BIT(3)
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#define CFFPS_MFR_PS_KILL BIT(4)
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#define CFFPS_MFR_OC_FAULT BIT(5)
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#define CFFPS_MFR_VAUX_FAULT BIT(6)
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#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
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static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
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int reg)
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{
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int rc, mfr;
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switch (reg) {
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case PMBUS_STATUS_VOUT:
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case PMBUS_STATUS_IOUT:
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case PMBUS_STATUS_TEMPERATURE:
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case PMBUS_STATUS_FAN_12:
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rc = pmbus_read_byte_data(client, page, reg);
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if (rc < 0)
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return rc;
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mfr = pmbus_read_byte_data(client, page,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfr < 0)
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/*
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* Return the status register instead of an error,
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* since we successfully read status.
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*/
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return rc;
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/* Add MFR_SPECIFIC bits to the standard pmbus status regs. */
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if (reg == PMBUS_STATUS_FAN_12) {
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if (mfr & CFFPS_MFR_FAN_FAULT)
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rc |= PB_FAN_FAN1_FAULT;
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} else if (reg == PMBUS_STATUS_TEMPERATURE) {
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if (mfr & CFFPS_MFR_THERMAL_FAULT)
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rc |= PB_TEMP_OT_FAULT;
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} else if (reg == PMBUS_STATUS_VOUT) {
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if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
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rc |= PB_VOLTAGE_OV_FAULT;
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if (mfr & CFFPS_MFR_UV_FAULT)
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rc |= PB_VOLTAGE_UV_FAULT;
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} else if (reg == PMBUS_STATUS_IOUT) {
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if (mfr & CFFPS_MFR_OC_FAULT)
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rc |= PB_IOUT_OC_FAULT;
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if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
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rc |= PB_CURRENT_SHARE_FAULT;
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}
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break;
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default:
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rc = -ENODATA;
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break;
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}
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return rc;
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}
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static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
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int reg)
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{
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int rc, mfr;
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switch (reg) {
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case PMBUS_STATUS_WORD:
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rc = pmbus_read_word_data(client, page, reg);
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if (rc < 0)
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return rc;
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mfr = pmbus_read_byte_data(client, page,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfr < 0)
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/*
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* Return the status register instead of an error,
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* since we successfully read status.
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*/
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return rc;
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if (mfr & CFFPS_MFR_PS_KILL)
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rc |= PB_STATUS_OFF;
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break;
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default:
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rc = -ENODATA;
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break;
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}
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return rc;
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}
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static struct pmbus_driver_info ibm_cffps_info = {
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.pages = 1,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
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.read_byte_data = ibm_cffps_read_byte_data,
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.read_word_data = ibm_cffps_read_word_data,
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};
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static int ibm_cffps_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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return pmbus_do_probe(client, id, &ibm_cffps_info);
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}
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static const struct i2c_device_id ibm_cffps_id[] = {
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{ "ibm_cffps1", 1 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
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static const struct of_device_id ibm_cffps_of_match[] = {
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{ .compatible = "ibm,cffps1" },
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{}
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};
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MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
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static struct i2c_driver ibm_cffps_driver = {
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.driver = {
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.name = "ibm-cffps",
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.of_match_table = ibm_cffps_of_match,
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},
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.probe = ibm_cffps_probe,
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.remove = pmbus_do_remove,
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.id_table = ibm_cffps_id,
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};
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module_i2c_driver(ibm_cffps_driver);
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MODULE_AUTHOR("Eddie James");
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MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
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MODULE_LICENSE("GPL");
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