2019-05-20 15:19:02 +08:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2011-01-27 12:11:04 +08:00
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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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2015-08-18 07:17:24 +08:00
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#include <linux/bitops.h>
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2011-01-27 12:11:04 +08:00
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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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2011-07-10 04:11:44 +08:00
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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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2011-01-27 12:11:04 +08:00
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#define MAX8688_MFG_STATUS 0xd8
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2015-08-18 07:17:24 +08:00
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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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2011-01-27 12:11:04 +08:00
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2011-07-10 04:11:44 +08:00
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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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2018-03-11 09:49:47 +08:00
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if (page > 0)
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2011-09-01 23:34:31 +08:00
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return -ENXIO;
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2011-07-10 04:11:44 +08:00
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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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2011-03-09 15:00:10 +08:00
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static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
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2011-01-27 12:11:04 +08:00
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{
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int ret = 0;
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int mfg_status;
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2011-07-30 13:19:39 +08:00
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if (page > 0)
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2011-09-01 23:34:31 +08:00
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return -ENXIO;
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2011-01-27 12:11:04 +08:00
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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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2011-06-26 02:21:49 +08:00
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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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2011-01-27 12:11:04 +08:00
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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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2011-03-09 15:00:10 +08:00
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.read_byte_data = max8688_read_byte_data,
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2011-07-10 04:11:44 +08:00
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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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2011-01-27 12:11:04 +08:00
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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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2012-02-23 00:56:44 +08:00
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.remove = pmbus_do_remove,
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2011-01-27 12:11:04 +08:00
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.id_table = max8688_id,
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};
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2012-01-20 15:38:18 +08:00
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module_i2c_driver(max8688_driver);
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2011-01-27 12:11:04 +08:00
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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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