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