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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Hardware monitoring driver for IR35221
- *
- * Copyright (C) IBM Corporation 2017.
- */
- #include <linux/err.h>
- #include <linux/i2c.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include "pmbus.h"
- #define IR35221_MFR_VIN_PEAK 0xc5
- #define IR35221_MFR_VOUT_PEAK 0xc6
- #define IR35221_MFR_IOUT_PEAK 0xc7
- #define IR35221_MFR_TEMP_PEAK 0xc8
- #define IR35221_MFR_VIN_VALLEY 0xc9
- #define IR35221_MFR_VOUT_VALLEY 0xca
- #define IR35221_MFR_IOUT_VALLEY 0xcb
- #define IR35221_MFR_TEMP_VALLEY 0xcc
- static int ir35221_read_word_data(struct i2c_client *client, int page,
- int phase, int reg)
- {
- int ret;
- switch (reg) {
- case PMBUS_VIRT_READ_VIN_MAX:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_VIN_PEAK);
- break;
- case PMBUS_VIRT_READ_VOUT_MAX:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_VOUT_PEAK);
- break;
- case PMBUS_VIRT_READ_IOUT_MAX:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_IOUT_PEAK);
- break;
- case PMBUS_VIRT_READ_TEMP_MAX:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_TEMP_PEAK);
- break;
- case PMBUS_VIRT_READ_VIN_MIN:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_VIN_VALLEY);
- break;
- case PMBUS_VIRT_READ_VOUT_MIN:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_VOUT_VALLEY);
- break;
- case PMBUS_VIRT_READ_IOUT_MIN:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_IOUT_VALLEY);
- break;
- case PMBUS_VIRT_READ_TEMP_MIN:
- ret = pmbus_read_word_data(client, page, phase,
- IR35221_MFR_TEMP_VALLEY);
- break;
- default:
- ret = -ENODATA;
- break;
- }
- return ret;
- }
- static int ir35221_probe(struct i2c_client *client)
- {
- struct pmbus_driver_info *info;
- u8 buf[I2C_SMBUS_BLOCK_MAX];
- int ret;
- if (!i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_READ_BYTE_DATA
- | I2C_FUNC_SMBUS_READ_WORD_DATA
- | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
- return -ENODEV;
- ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
- if (ret < 0) {
- dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
- return ret;
- }
- if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
- dev_err(&client->dev, "MFR_ID unrecognised\n");
- return -ENODEV;
- }
- ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
- if (ret < 0) {
- dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
- return ret;
- }
- if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
- dev_err(&client->dev, "MFR_MODEL unrecognised\n");
- return -ENODEV;
- }
- info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
- GFP_KERNEL);
- if (!info)
- return -ENOMEM;
- info->read_word_data = ir35221_read_word_data;
- info->pages = 2;
- info->format[PSC_VOLTAGE_IN] = linear;
- info->format[PSC_VOLTAGE_OUT] = linear;
- info->format[PSC_CURRENT_IN] = linear;
- info->format[PSC_CURRENT_OUT] = linear;
- info->format[PSC_POWER] = linear;
- info->format[PSC_TEMPERATURE] = linear;
- info->func[0] = PMBUS_HAVE_VIN
- | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
- | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
- | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
- | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
- | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
- info->func[1] = info->func[0];
- return pmbus_do_probe(client, info);
- }
- static const struct i2c_device_id ir35221_id[] = {
- {"ir35221", 0},
- {}
- };
- MODULE_DEVICE_TABLE(i2c, ir35221_id);
- static struct i2c_driver ir35221_driver = {
- .driver = {
- .name = "ir35221",
- },
- .probe_new = ir35221_probe,
- .id_table = ir35221_id,
- };
- module_i2c_driver(ir35221_driver);
- MODULE_AUTHOR("Samuel Mendoza-Jonas <[email protected]");
- MODULE_DESCRIPTION("PMBus driver for IR35221");
- MODULE_LICENSE("GPL");
- MODULE_IMPORT_NS(PMBUS);
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