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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
192 lines
4.7 KiB
C
192 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/bitops.h>
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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_MFR_VOUT_PEAK 0xd4
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#define MAX8688_MFR_IOUT_PEAK 0xd5
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#define MAX8688_MFR_TEMPERATURE_PEAK 0xd6
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#define MAX8688_MFG_STATUS 0xd8
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#define MAX8688_STATUS_OC_FAULT BIT(4)
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#define MAX8688_STATUS_OV_FAULT BIT(5)
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#define MAX8688_STATUS_OV_WARNING BIT(8)
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#define MAX8688_STATUS_UV_FAULT BIT(9)
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#define MAX8688_STATUS_UV_WARNING BIT(10)
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#define MAX8688_STATUS_UC_FAULT BIT(11)
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#define MAX8688_STATUS_OC_WARNING BIT(12)
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#define MAX8688_STATUS_OT_FAULT BIT(13)
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#define MAX8688_STATUS_OT_WARNING BIT(14)
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static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
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{
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int ret;
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if (page > 0)
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return -ENXIO;
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switch (reg) {
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
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break;
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case PMBUS_VIRT_READ_TEMP_MAX:
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ret = pmbus_read_word_data(client, 0,
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MAX8688_MFR_TEMPERATURE_PEAK);
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break;
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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ret = 0;
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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 int max8688_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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int ret;
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switch (reg) {
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
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0);
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
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0);
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break;
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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ret = pmbus_write_word_data(client, 0,
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MAX8688_MFR_TEMPERATURE_PEAK,
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0xffff);
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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 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 > 0)
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return -ENXIO;
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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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.read_word_data = max8688_read_word_data,
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.write_word_data = max8688_write_word_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 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 = pmbus_do_remove,
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.id_table = max8688_id,
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};
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module_i2c_driver(max8688_driver);
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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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