drivers/hwmon/pmbus/max8688.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for Maxim MAX8688
   4  *
   5  * Copyright (c) 2011 Ericsson AB.
   6  */
   7
   8 #include <linux/bitops.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/err.h>
  13 #include <linux/i2c.h>
  14 #include "pmbus.h"
  15
  16 #define MAX8688_MFR_VOUT_PEAK           0xd4
  17 #define MAX8688_MFR_IOUT_PEAK           0xd5
  18 #define MAX8688_MFR_TEMPERATURE_PEAK    0xd6
  19 #define MAX8688_MFG_STATUS              0xd8
  20
  21 #define MAX8688_STATUS_OC_FAULT         BIT(4)
  22 #define MAX8688_STATUS_OV_FAULT         BIT(5)
  23 #define MAX8688_STATUS_OV_WARNING       BIT(8)
  24 #define MAX8688_STATUS_UV_FAULT         BIT(9)
  25 #define MAX8688_STATUS_UV_WARNING       BIT(10)
  26 #define MAX8688_STATUS_UC_FAULT         BIT(11)
  27 #define MAX8688_STATUS_OC_WARNING       BIT(12)
  28 #define MAX8688_STATUS_OT_FAULT         BIT(13)
  29 #define MAX8688_STATUS_OT_WARNING       BIT(14)
  30
  31 static int max8688_read_word_data(struct i2c_client *client, int page,
  32                                   int phase, int reg)
  33 {
  34         int ret;
  35
  36         if (page > 0)
  37                 return -ENXIO;
  38
  39         switch (reg) {
  40         case PMBUS_VIRT_READ_VOUT_MAX:
  41                 ret = pmbus_read_word_data(client, 0, 0xff,
  42                                            MAX8688_MFR_VOUT_PEAK);
  43                 break;
  44         case PMBUS_VIRT_READ_IOUT_MAX:
  45                 ret = pmbus_read_word_data(client, 0, 0xff,
  46                                            MAX8688_MFR_IOUT_PEAK);
  47                 break;
  48         case PMBUS_VIRT_READ_TEMP_MAX:
  49                 ret = pmbus_read_word_data(client, 0, 0xff,
  50                                            MAX8688_MFR_TEMPERATURE_PEAK);
  51                 break;
  52         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  53         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  54         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  55                 ret = 0;
  56                 break;
  57         default:
  58                 ret = -ENODATA;
  59                 break;
  60         }
  61         return ret;
  62 }
  63
  64 static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
  65                                    u16 word)
  66 {
  67         int ret;
  68
  69         switch (reg) {
  70         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  71                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
  72                                             0);
  73                 break;
  74         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  75                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
  76                                             0);
  77                 break;
  78         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  79                 ret = pmbus_write_word_data(client, 0,
  80                                             MAX8688_MFR_TEMPERATURE_PEAK,
  81                                             0xffff);
  82                 break;
  83         default:
  84                 ret = -ENODATA;
  85                 break;
  86         }
  87         return ret;
  88 }
  89
  90 static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
  91 {
  92         int ret = 0;
  93         int mfg_status;
  94
  95         if (page > 0)
  96                 return -ENXIO;
  97
  98         switch (reg) {
  99         case PMBUS_STATUS_VOUT:
 100                 mfg_status = pmbus_read_word_data(client, 0, 0xff,
 101                                                   MAX8688_MFG_STATUS);
 102                 if (mfg_status < 0)
 103                         return mfg_status;
 104                 if (mfg_status & MAX8688_STATUS_UV_WARNING)
 105                         ret |= PB_VOLTAGE_UV_WARNING;
 106                 if (mfg_status & MAX8688_STATUS_UV_FAULT)
 107                         ret |= PB_VOLTAGE_UV_FAULT;
 108                 if (mfg_status & MAX8688_STATUS_OV_WARNING)
 109                         ret |= PB_VOLTAGE_OV_WARNING;
 110                 if (mfg_status & MAX8688_STATUS_OV_FAULT)
 111                         ret |= PB_VOLTAGE_OV_FAULT;
 112                 break;
 113         case PMBUS_STATUS_IOUT:
 114                 mfg_status = pmbus_read_word_data(client, 0, 0xff,
 115                                                   MAX8688_MFG_STATUS);
 116                 if (mfg_status < 0)
 117                         return mfg_status;
 118                 if (mfg_status & MAX8688_STATUS_UC_FAULT)
 119                         ret |= PB_IOUT_UC_FAULT;
 120                 if (mfg_status & MAX8688_STATUS_OC_WARNING)
 121                         ret |= PB_IOUT_OC_WARNING;
 122                 if (mfg_status & MAX8688_STATUS_OC_FAULT)
 123                         ret |= PB_IOUT_OC_FAULT;
 124                 break;
 125         case PMBUS_STATUS_TEMPERATURE:
 126                 mfg_status = pmbus_read_word_data(client, 0, 0xff,
 127                                                   MAX8688_MFG_STATUS);
 128                 if (mfg_status < 0)
 129                         return mfg_status;
 130                 if (mfg_status & MAX8688_STATUS_OT_WARNING)
 131                         ret |= PB_TEMP_OT_WARNING;
 132                 if (mfg_status & MAX8688_STATUS_OT_FAULT)
 133                         ret |= PB_TEMP_OT_FAULT;
 134                 break;
 135         default:
 136                 ret = -ENODATA;
 137                 break;
 138         }
 139         return ret;
 140 }
 141
 142 static struct pmbus_driver_info max8688_info = {
 143         .pages = 1,
 144         .format[PSC_VOLTAGE_IN] = direct,
 145         .format[PSC_VOLTAGE_OUT] = direct,
 146         .format[PSC_TEMPERATURE] = direct,
 147         .format[PSC_CURRENT_OUT] = direct,
 148         .m[PSC_VOLTAGE_IN] = 19995,
 149         .b[PSC_VOLTAGE_IN] = 0,
 150         .R[PSC_VOLTAGE_IN] = -1,
 151         .m[PSC_VOLTAGE_OUT] = 19995,
 152         .b[PSC_VOLTAGE_OUT] = 0,
 153         .R[PSC_VOLTAGE_OUT] = -1,
 154         .m[PSC_CURRENT_OUT] = 23109,
 155         .b[PSC_CURRENT_OUT] = 0,
 156         .R[PSC_CURRENT_OUT] = -2,
 157         .m[PSC_TEMPERATURE] = -7612,
 158         .b[PSC_TEMPERATURE] = 335,
 159         .R[PSC_TEMPERATURE] = -3,
 160         .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
 161                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
 162                 | PMBUS_HAVE_STATUS_TEMP,
 163         .read_byte_data = max8688_read_byte_data,
 164         .read_word_data = max8688_read_word_data,
 165         .write_word_data = max8688_write_word_data,
 166 };
 167
 168 static int max8688_probe(struct i2c_client *client)
 169 {
 170         return pmbus_do_probe(client, &max8688_info);
 171 }
 172
 173 static const struct i2c_device_id max8688_id[] = {
 174         {"max8688", 0},
 175         { }
 176 };
 177
 178 MODULE_DEVICE_TABLE(i2c, max8688_id);
 179
 180 /* This is the driver that will be inserted */
 181 static struct i2c_driver max8688_driver = {
 182         .driver = {
 183                    .name = "max8688",
 184                    },
 185         .probe_new = max8688_probe,
 186         .id_table = max8688_id,
 187 };
 188
 189 module_i2c_driver(max8688_driver);
 190
 191 MODULE_AUTHOR("Guenter Roeck");
 192 MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
 193 MODULE_LICENSE("GPL");