145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for IR35221
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*
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* Copyright (C) IBM Corporation 2017.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "pmbus.h"
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#define IR35221_MFR_VIN_PEAK 0xc5
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#define IR35221_MFR_VOUT_PEAK 0xc6
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#define IR35221_MFR_IOUT_PEAK 0xc7
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#define IR35221_MFR_TEMP_PEAK 0xc8
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#define IR35221_MFR_VIN_VALLEY 0xc9
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#define IR35221_MFR_VOUT_VALLEY 0xca
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#define IR35221_MFR_IOUT_VALLEY 0xcb
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#define IR35221_MFR_TEMP_VALLEY 0xcc
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static int ir35221_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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switch (reg) {
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case PMBUS_VIRT_READ_VIN_MAX:
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ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
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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, page, IR35221_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, page, IR35221_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, page, IR35221_MFR_TEMP_PEAK);
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break;
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case PMBUS_VIRT_READ_VIN_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_VIN_VALLEY);
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break;
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case PMBUS_VIRT_READ_VOUT_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_VOUT_VALLEY);
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break;
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case PMBUS_VIRT_READ_IOUT_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_IOUT_VALLEY);
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break;
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case PMBUS_VIRT_READ_TEMP_MIN:
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ret = pmbus_read_word_data(client, page,
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IR35221_MFR_TEMP_VALLEY);
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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 ir35221_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pmbus_driver_info *info;
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u8 buf[I2C_SMBUS_BLOCK_MAX];
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int ret;
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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_READ_WORD_DATA
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| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
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return -ENODEV;
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ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
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return ret;
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}
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if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
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dev_err(&client->dev, "MFR_ID unrecognised\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, buf);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
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return ret;
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}
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if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
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dev_err(&client->dev, "MFR_MODEL unrecognised\n");
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return -ENODEV;
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}
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info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->read_word_data = ir35221_read_word_data;
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info->pages = 2;
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info->format[PSC_VOLTAGE_IN] = linear;
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info->format[PSC_VOLTAGE_OUT] = linear;
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info->format[PSC_CURRENT_IN] = linear;
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info->format[PSC_CURRENT_OUT] = linear;
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info->format[PSC_POWER] = linear;
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info->format[PSC_TEMPERATURE] = linear;
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info->func[0] = PMBUS_HAVE_VIN
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| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
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| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
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| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
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| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
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| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
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info->func[1] = info->func[0];
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return pmbus_do_probe(client, id, info);
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}
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static const struct i2c_device_id ir35221_id[] = {
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{"ir35221", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ir35221_id);
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static struct i2c_driver ir35221_driver = {
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.driver = {
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.name = "ir35221",
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},
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.probe = ir35221_probe,
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.remove = pmbus_do_remove,
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.id_table = ir35221_id,
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};
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module_i2c_driver(ir35221_driver);
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MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
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MODULE_DESCRIPTION("PMBus driver for IR35221");
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MODULE_LICENSE("GPL");
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