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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c5e6763667
ADM1275 supports a second current limit, which can be configured as either lower or upper limit. Add support for it and report it as either lower or upper critical current limit. Also replace error return code EINVAL for unsupported pages with ENXIO as this is more appropriate for the observed condition. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Acked-by: Jean Delvare <khali@linux-fr.org>
272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*
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* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
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* and Digital Power Monitor
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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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#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/slab.h>
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#include <linux/i2c.h>
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#include "pmbus.h"
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#define ADM1275_PEAK_IOUT 0xd0
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#define ADM1275_PEAK_VIN 0xd1
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#define ADM1275_PEAK_VOUT 0xd2
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#define ADM1275_PMON_CONFIG 0xd4
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#define ADM1275_VIN_VOUT_SELECT (1 << 6)
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#define ADM1275_VRANGE (1 << 5)
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#define ADM1275_IOUT_WARN2_LIMIT 0xd7
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#define ADM1275_DEVICE_CONFIG 0xd8
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#define ADM1275_IOUT_WARN2_SELECT (1 << 4)
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#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0)
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struct adm1275_data {
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bool have_oc_fault;
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struct pmbus_driver_info info;
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};
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#define to_adm1275_data(x) container_of(x, struct adm1275_data, info)
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static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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const struct adm1275_data *data = to_adm1275_data(info);
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int ret;
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if (page)
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return -ENXIO;
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switch (reg) {
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case PMBUS_IOUT_UC_FAULT_LIMIT:
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if (data->have_oc_fault) {
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ret = -ENXIO;
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break;
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}
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ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
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break;
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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if (!data->have_oc_fault) {
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ret = -ENXIO;
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break;
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}
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ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
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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, ADM1275_PEAK_IOUT);
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break;
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
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break;
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case PMBUS_VIRT_READ_VIN_MAX:
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ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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case PMBUS_VIRT_RESET_VIN_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 adm1275_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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if (page)
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return -ENXIO;
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switch (reg) {
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case PMBUS_IOUT_UC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
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word);
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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, ADM1275_PEAK_IOUT, 0);
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break;
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
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break;
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case PMBUS_VIRT_RESET_VIN_HISTORY:
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ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 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 adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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const struct adm1275_data *data = to_adm1275_data(info);
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int mfr_status, ret;
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if (page)
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return -ENXIO;
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switch (reg) {
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case PMBUS_STATUS_IOUT:
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ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
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if (ret < 0)
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break;
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mfr_status = pmbus_read_byte_data(client, page,
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PMBUS_STATUS_MFR_SPECIFIC);
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if (mfr_status < 0) {
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ret = mfr_status;
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break;
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}
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if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
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ret |= data->have_oc_fault ?
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PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
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}
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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 adm1275_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int config, device_config;
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int ret;
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struct pmbus_driver_info *info;
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struct adm1275_data *data;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA))
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return -ENODEV;
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data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
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if (config < 0) {
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ret = config;
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goto err_mem;
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}
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device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
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if (device_config < 0) {
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ret = device_config;
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goto err_mem;
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}
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info = &data->info;
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info->pages = 1;
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info->format[PSC_VOLTAGE_IN] = direct;
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info->format[PSC_VOLTAGE_OUT] = direct;
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info->format[PSC_CURRENT_OUT] = direct;
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info->m[PSC_CURRENT_OUT] = 807;
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info->b[PSC_CURRENT_OUT] = 20475;
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info->R[PSC_CURRENT_OUT] = -1;
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info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
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info->read_word_data = adm1275_read_word_data;
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info->read_byte_data = adm1275_read_byte_data;
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info->write_word_data = adm1275_write_word_data;
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if (config & ADM1275_VRANGE) {
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info->m[PSC_VOLTAGE_IN] = 19199;
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info->b[PSC_VOLTAGE_IN] = 0;
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info->R[PSC_VOLTAGE_IN] = -2;
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info->m[PSC_VOLTAGE_OUT] = 19199;
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info->b[PSC_VOLTAGE_OUT] = 0;
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info->R[PSC_VOLTAGE_OUT] = -2;
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} else {
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info->m[PSC_VOLTAGE_IN] = 6720;
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info->b[PSC_VOLTAGE_IN] = 0;
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info->R[PSC_VOLTAGE_IN] = -1;
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info->m[PSC_VOLTAGE_OUT] = 6720;
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info->b[PSC_VOLTAGE_OUT] = 0;
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info->R[PSC_VOLTAGE_OUT] = -1;
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}
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if (device_config & ADM1275_IOUT_WARN2_SELECT)
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data->have_oc_fault = true;
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if (config & ADM1275_VIN_VOUT_SELECT)
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info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
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else
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info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
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ret = pmbus_do_probe(client, id, info);
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if (ret)
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goto err_mem;
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return 0;
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err_mem:
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kfree(data);
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return ret;
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}
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static int adm1275_remove(struct i2c_client *client)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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const struct adm1275_data *data = to_adm1275_data(info);
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pmbus_do_remove(client);
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kfree(data);
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return 0;
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}
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static const struct i2c_device_id adm1275_id[] = {
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{"adm1275", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adm1275_id);
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static struct i2c_driver adm1275_driver = {
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.driver = {
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.name = "adm1275",
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},
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.probe = adm1275_probe,
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.remove = adm1275_remove,
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.id_table = adm1275_id,
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};
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static int __init adm1275_init(void)
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{
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return i2c_add_driver(&adm1275_driver);
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}
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static void __exit adm1275_exit(void)
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{
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i2c_del_driver(&adm1275_driver);
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}
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MODULE_AUTHOR("Guenter Roeck");
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MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
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MODULE_LICENSE("GPL");
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module_init(adm1275_init);
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module_exit(adm1275_exit);
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