344 строки
8.4 KiB
C
344 строки
8.4 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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enum chips { adm1275, adm1276 };
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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 ADM1276_PEAK_PIN 0xda
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#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0)
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struct adm1275_data {
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int id;
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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 = 0;
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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_READ_PIN_MAX:
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if (data->id != adm1276) {
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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, ADM1276_PEAK_PIN);
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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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break;
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case PMBUS_VIRT_RESET_PIN_HISTORY:
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if (data->id != adm1276)
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ret = -ENXIO;
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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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case PMBUS_VIRT_RESET_PIN_HISTORY:
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ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 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 > 0)
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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 const struct i2c_device_id adm1275_id[] = {
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{ "adm1275", adm1275 },
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{ "adm1276", adm1276 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adm1275_id);
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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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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
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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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const struct i2c_device_id *mid;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA
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| I2C_FUNC_SMBUS_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read Manufacturer ID\n");
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return ret;
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}
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if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
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dev_err(&client->dev, "Unsupported Manufacturer ID\n");
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return -ENODEV;
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}
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read Manufacturer Model\n");
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return ret;
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}
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for (mid = adm1275_id; mid->name[0]; mid++) {
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if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
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break;
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}
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if (!mid->name[0]) {
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dev_err(&client->dev, "Unsupported device\n");
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return -ENODEV;
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}
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if (id->driver_data != mid->driver_data)
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dev_notice(&client->dev,
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"Device mismatch: Configured %s, detected %s\n",
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id->name, mid->name);
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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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return config;
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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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return device_config;
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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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data->id = mid->driver_data;
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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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switch (data->id) {
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case adm1275:
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if (config & ADM1275_VIN_VOUT_SELECT)
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info->func[0] |=
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
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else
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info->func[0] |=
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PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
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break;
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case adm1276:
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info->format[PSC_POWER] = direct;
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info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
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| PMBUS_HAVE_STATUS_INPUT;
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if (config & ADM1275_VIN_VOUT_SELECT)
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info->func[0] |=
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
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if (config & ADM1275_VRANGE) {
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info->m[PSC_POWER] = 6043;
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info->b[PSC_POWER] = 0;
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info->R[PSC_POWER] = -2;
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} else {
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info->m[PSC_POWER] = 2115;
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info->b[PSC_POWER] = 0;
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info->R[PSC_POWER] = -1;
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}
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break;
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}
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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 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 and compatibles");
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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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