drivers/hwmon/pmbus/ir36021.c

   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
  14 static 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
  29 static 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
  53 static const struct i2c_device_id ir36021_id[] = {
  54         { "ir36021" },
  55         {},
  56 };
  57 MODULE_DEVICE_TABLE(i2c, ir36021_id);
  58
  59 static const struct of_device_id __maybe_unused ir36021_of_id[] = {
  60         { .compatible = "infineon,ir36021" },
  61         {},
  62 };
  63 MODULE_DEVICE_TABLE(of, ir36021_of_id);
  64
  65 static struct i2c_driver ir36021_driver = {
  66         .driver = {
  67                 .name = "ir36021",
  68                 .of_match_table = of_match_ptr(ir36021_of_id),
  69         },
  70         .probe = ir36021_probe,
  71         .id_table = ir36021_id,
  72 };
  73
  74 module_i2c_driver(ir36021_driver);
  75
  76 MODULE_AUTHOR("Chris Packham <chris.packham@alliedtelesis.co.nz>");
  77 MODULE_DESCRIPTION("PMBus driver for Infineon IR36021");
  78 MODULE_LICENSE("GPL");
  79 MODULE_IMPORT_NS("PMBUS");