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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1061d8518f
In VID mode, output voltages are measured and reported as VID values, and have to be converted to voltages using VID conversion tables or functions. Support is added for VR11 only at this time. This patch enables support for PMBus devices supporting VID VR11 based output voltage selection such as NCP4200 and NCP4208. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/*
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* Hardware monitoring driver for Maxim MAX8688
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*
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* Copyright (c) 2011 Ericsson AB.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include "pmbus.h"
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#define MAX8688_MFG_STATUS 0xd8
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#define MAX8688_STATUS_OC_FAULT (1 << 4)
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#define MAX8688_STATUS_OV_FAULT (1 << 5)
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#define MAX8688_STATUS_OV_WARNING (1 << 8)
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#define MAX8688_STATUS_UV_FAULT (1 << 9)
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#define MAX8688_STATUS_UV_WARNING (1 << 10)
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#define MAX8688_STATUS_UC_FAULT (1 << 11)
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#define MAX8688_STATUS_OC_WARNING (1 << 12)
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#define MAX8688_STATUS_OT_FAULT (1 << 13)
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#define MAX8688_STATUS_OT_WARNING (1 << 14)
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static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret = 0;
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int mfg_status;
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if (page)
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return -EINVAL;
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switch (reg) {
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case PMBUS_STATUS_VOUT:
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mfg_status = pmbus_read_word_data(client, 0,
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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_UV_WARNING)
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ret |= PB_VOLTAGE_UV_WARNING;
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if (mfg_status & MAX8688_STATUS_UV_FAULT)
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ret |= PB_VOLTAGE_UV_FAULT;
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if (mfg_status & MAX8688_STATUS_OV_WARNING)
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ret |= PB_VOLTAGE_OV_WARNING;
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if (mfg_status & MAX8688_STATUS_OV_FAULT)
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ret |= PB_VOLTAGE_OV_FAULT;
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break;
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case PMBUS_STATUS_IOUT:
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mfg_status = pmbus_read_word_data(client, 0,
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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_UC_FAULT)
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ret |= PB_IOUT_UC_FAULT;
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if (mfg_status & MAX8688_STATUS_OC_WARNING)
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ret |= PB_IOUT_OC_WARNING;
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if (mfg_status & MAX8688_STATUS_OC_FAULT)
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ret |= PB_IOUT_OC_FAULT;
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break;
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case PMBUS_STATUS_TEMPERATURE:
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mfg_status = pmbus_read_word_data(client, 0,
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MAX8688_MFG_STATUS);
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if (mfg_status < 0)
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return mfg_status;
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if (mfg_status & MAX8688_STATUS_OT_WARNING)
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ret |= PB_TEMP_OT_WARNING;
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if (mfg_status & MAX8688_STATUS_OT_FAULT)
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ret |= PB_TEMP_OT_FAULT;
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break;
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default:
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info max8688_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.format[PSC_CURRENT_OUT] = direct,
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.m[PSC_VOLTAGE_IN] = 19995,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = -1,
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.m[PSC_VOLTAGE_OUT] = 19995,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = -1,
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.m[PSC_CURRENT_OUT] = 23109,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = -2,
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.m[PSC_TEMPERATURE] = -7612,
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.b[PSC_TEMPERATURE] = 335,
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.R[PSC_TEMPERATURE] = -3,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_STATUS_TEMP,
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.read_byte_data = max8688_read_byte_data,
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};
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static int max8688_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, &max8688_info);
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}
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static int max8688_remove(struct i2c_client *client)
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{
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return pmbus_do_remove(client);
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}
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static const struct i2c_device_id max8688_id[] = {
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{"max8688", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max8688_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver max8688_driver = {
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.driver = {
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.name = "max8688",
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},
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.probe = max8688_probe,
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.remove = max8688_remove,
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.id_table = max8688_id,
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};
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static int __init max8688_init(void)
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{
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return i2c_add_driver(&max8688_driver);
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}
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static void __exit max8688_exit(void)
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{
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i2c_del_driver(&max8688_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
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MODULE_LICENSE("GPL");
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module_init(max8688_init);
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module_exit(max8688_exit);
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