drivers/hwmon/pmbus/ir35221.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for IR35221
   4  *
   5  * Copyright (C) IBM Corporation 2017.
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/i2c.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include "pmbus.h"
  14
  15 #define IR35221_MFR_VIN_PEAK            0xc5
  16 #define IR35221_MFR_VOUT_PEAK           0xc6
  17 #define IR35221_MFR_IOUT_PEAK           0xc7
  18 #define IR35221_MFR_TEMP_PEAK           0xc8
  19 #define IR35221_MFR_VIN_VALLEY          0xc9
  20 #define IR35221_MFR_VOUT_VALLEY         0xca
  21 #define IR35221_MFR_IOUT_VALLEY         0xcb
  22 #define IR35221_MFR_TEMP_VALLEY         0xcc
  23
  24 static int ir35221_read_word_data(struct i2c_client *client, int page,
  25                                   int phase, int reg)
  26 {
  27         int ret;
  28
  29         switch (reg) {
  30         case PMBUS_VIRT_READ_VIN_MAX:
  31                 ret = pmbus_read_word_data(client, page, phase,
  32                                            IR35221_MFR_VIN_PEAK);
  33                 break;
  34         case PMBUS_VIRT_READ_VOUT_MAX:
  35                 ret = pmbus_read_word_data(client, page, phase,
  36                                            IR35221_MFR_VOUT_PEAK);
  37                 break;
  38         case PMBUS_VIRT_READ_IOUT_MAX:
  39                 ret = pmbus_read_word_data(client, page, phase,
  40                                            IR35221_MFR_IOUT_PEAK);
  41                 break;
  42         case PMBUS_VIRT_READ_TEMP_MAX:
  43                 ret = pmbus_read_word_data(client, page, phase,
  44                                            IR35221_MFR_TEMP_PEAK);
  45                 break;
  46         case PMBUS_VIRT_READ_VIN_MIN:
  47                 ret = pmbus_read_word_data(client, page, phase,
  48                                            IR35221_MFR_VIN_VALLEY);
  49                 break;
  50         case PMBUS_VIRT_READ_VOUT_MIN:
  51                 ret = pmbus_read_word_data(client, page, phase,
  52                                            IR35221_MFR_VOUT_VALLEY);
  53                 break;
  54         case PMBUS_VIRT_READ_IOUT_MIN:
  55                 ret = pmbus_read_word_data(client, page, phase,
  56                                            IR35221_MFR_IOUT_VALLEY);
  57                 break;
  58         case PMBUS_VIRT_READ_TEMP_MIN:
  59                 ret = pmbus_read_word_data(client, page, phase,
  60                                            IR35221_MFR_TEMP_VALLEY);
  61                 break;
  62         default:
  63                 ret = -ENODATA;
  64                 break;
  65         }
  66
  67         return ret;
  68 }
  69
  70 static int ir35221_probe(struct i2c_client *client,
  71                          const struct i2c_device_id *id)
  72 {
  73         struct pmbus_driver_info *info;
  74         u8 buf[I2C_SMBUS_BLOCK_MAX];
  75         int ret;
  76
  77         if (!i2c_check_functionality(client->adapter,
  78                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
  79                                 | I2C_FUNC_SMBUS_READ_WORD_DATA
  80                                 | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
  81                 return -ENODEV;
  82
  83         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
  84         if (ret < 0) {
  85                 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
  86                 return ret;
  87         }
  88         if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
  89                 dev_err(&client->dev, "MFR_ID unrecognised\n");
  90                 return -ENODEV;
  91         }
  92
  93         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
  94         if (ret < 0) {
  95                 dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
  96                 return ret;
  97         }
  98         if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
  99                 dev_err(&client->dev, "MFR_MODEL unrecognised\n");
 100                 return -ENODEV;
 101         }
 102
 103         info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
 104                             GFP_KERNEL);
 105         if (!info)
 106                 return -ENOMEM;
 107
 108         info->read_word_data = ir35221_read_word_data;
 109
 110         info->pages = 2;
 111         info->format[PSC_VOLTAGE_IN] = linear;
 112         info->format[PSC_VOLTAGE_OUT] = linear;
 113         info->format[PSC_CURRENT_IN] = linear;
 114         info->format[PSC_CURRENT_OUT] = linear;
 115         info->format[PSC_POWER] = linear;
 116         info->format[PSC_TEMPERATURE] = linear;
 117
 118         info->func[0] = PMBUS_HAVE_VIN
 119                 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
 120                 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
 121                 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
 122                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
 123                 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
 124         info->func[1] = info->func[0];
 125
 126         return pmbus_do_probe(client, id, info);
 127 }
 128
 129 static const struct i2c_device_id ir35221_id[] = {
 130         {"ir35221", 0},
 131         {}
 132 };
 133
 134 MODULE_DEVICE_TABLE(i2c, ir35221_id);
 135
 136 static struct i2c_driver ir35221_driver = {
 137         .driver = {
 138                 .name   = "ir35221",
 139         },
 140         .probe          = ir35221_probe,
 141         .remove         = pmbus_do_remove,
 142         .id_table       = ir35221_id,
 143 };
 144
 145 module_i2c_driver(ir35221_driver);
 146
 147 MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
 148 MODULE_DESCRIPTION("PMBus driver for IR35221");
 149 MODULE_LICENSE("GPL");