cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ir36021.c (2063B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Hardware monitoring driver for Infineon IR36021
      4 *
      5 * Copyright (c) 2021 Allied Telesis
      6 */
      7#include <linux/err.h>
      8#include <linux/i2c.h>
      9#include <linux/init.h>
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include "pmbus.h"
     13
     14static struct pmbus_driver_info ir36021_info = {
     15	.pages = 1,
     16	.format[PSC_VOLTAGE_IN] = linear,
     17	.format[PSC_VOLTAGE_OUT] = linear,
     18	.format[PSC_CURRENT_IN] = linear,
     19	.format[PSC_CURRENT_OUT] = linear,
     20	.format[PSC_POWER] = linear,
     21	.format[PSC_TEMPERATURE] = linear,
     22	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
     23		| PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
     24		| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
     25		| PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
     26		| PMBUS_HAVE_STATUS_TEMP,
     27};
     28
     29static int ir36021_probe(struct i2c_client *client)
     30{
     31	u8 buf[I2C_SMBUS_BLOCK_MAX];
     32	int ret;
     33
     34	if (!i2c_check_functionality(client->adapter,
     35				     I2C_FUNC_SMBUS_READ_BYTE_DATA
     36				     | I2C_FUNC_SMBUS_READ_WORD_DATA
     37				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
     38		return -ENODEV;
     39
     40	ret = i2c_smbus_read_i2c_block_data(client, PMBUS_MFR_MODEL, 2, buf);
     41	if (ret < 0) {
     42		dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
     43		return ret;
     44	}
     45	if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) {
     46		dev_err(&client->dev, "MFR_MODEL unrecognised\n");
     47		return -ENODEV;
     48	}
     49
     50	return pmbus_do_probe(client, &ir36021_info);
     51}
     52
     53static const struct i2c_device_id ir36021_id[] = {
     54	{ "ir36021", 0 },
     55	{},
     56};
     57MODULE_DEVICE_TABLE(i2c, ir36021_id);
     58
     59static const struct of_device_id __maybe_unused ir36021_of_id[] = {
     60	{ .compatible = "infineon,ir36021" },
     61	{},
     62};
     63MODULE_DEVICE_TABLE(of, ir36021_of_id);
     64
     65static struct i2c_driver ir36021_driver = {
     66	.class = I2C_CLASS_HWMON,
     67	.driver = {
     68		.name = "ir36021",
     69		.of_match_table = of_match_ptr(ir36021_of_id),
     70	},
     71	.probe_new = ir36021_probe,
     72	.id_table = ir36021_id,
     73};
     74
     75module_i2c_driver(ir36021_driver);
     76
     77MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>");
     78MODULE_DESCRIPTION("PMBus driver for Infineon IR36021");
     79MODULE_LICENSE("GPL");
     80MODULE_IMPORT_NS(PMBUS);