drivers/hwmon/pmbus/max8688.c

   1 /*
   2  * Hardware monitoring driver for Maxim MAX8688
   3  *
   4  * Copyright (c) 2011 Ericsson AB.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/err.h>
  25 #include <linux/i2c.h>
  26 #include "pmbus.h"
  27
  28 #define MAX8688_MFR_VOUT_PEAK           0xd4
  29 #define MAX8688_MFR_IOUT_PEAK           0xd5
  30 #define MAX8688_MFR_TEMPERATURE_PEAK    0xd6
  31 #define MAX8688_MFG_STATUS              0xd8
  32
  33 #define MAX8688_STATUS_OC_FAULT         (1 << 4)
  34 #define MAX8688_STATUS_OV_FAULT         (1 << 5)
  35 #define MAX8688_STATUS_OV_WARNING       (1 << 8)
  36 #define MAX8688_STATUS_UV_FAULT         (1 << 9)
  37 #define MAX8688_STATUS_UV_WARNING       (1 << 10)
  38 #define MAX8688_STATUS_UC_FAULT         (1 << 11)
  39 #define MAX8688_STATUS_OC_WARNING       (1 << 12)
  40 #define MAX8688_STATUS_OT_FAULT         (1 << 13)
  41 #define MAX8688_STATUS_OT_WARNING       (1 << 14)
  42
  43 static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
  44 {
  45         int ret;
  46
  47         if (page)
  48                 return -ENXIO;
  49
  50         switch (reg) {
  51         case PMBUS_VIRT_READ_VOUT_MAX:
  52                 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
  53                 break;
  54         case PMBUS_VIRT_READ_IOUT_MAX:
  55                 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
  56                 break;
  57         case PMBUS_VIRT_READ_TEMP_MAX:
  58                 ret = pmbus_read_word_data(client, 0,
  59                                            MAX8688_MFR_TEMPERATURE_PEAK);
  60                 break;
  61         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  62         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  63         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  64                 ret = 0;
  65                 break;
  66         default:
  67                 ret = -ENODATA;
  68                 break;
  69         }
  70         return ret;
  71 }
  72
  73 static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
  74                                    u16 word)
  75 {
  76         int ret;
  77
  78         switch (reg) {
  79         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  80                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
  81                                             0);
  82                 break;
  83         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  84                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
  85                                             0);
  86                 break;
  87         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  88                 ret = pmbus_write_word_data(client, 0,
  89                                             MAX8688_MFR_TEMPERATURE_PEAK,
  90                                             0xffff);
  91                 break;
  92         default:
  93                 ret = -ENODATA;
  94                 break;
  95         }
  96         return ret;
  97 }
  98
  99 static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
 100 {
 101         int ret = 0;
 102         int mfg_status;
 103
 104         if (page > 0)
 105                 return -ENXIO;
 106
 107         switch (reg) {
 108         case PMBUS_STATUS_VOUT:
 109                 mfg_status = pmbus_read_word_data(client, 0,
 110                                                   MAX8688_MFG_STATUS);
 111                 if (mfg_status < 0)
 112                         return mfg_status;
 113                 if (mfg_status & MAX8688_STATUS_UV_WARNING)
 114                         ret |= PB_VOLTAGE_UV_WARNING;
 115                 if (mfg_status & MAX8688_STATUS_UV_FAULT)
 116                         ret |= PB_VOLTAGE_UV_FAULT;
 117                 if (mfg_status & MAX8688_STATUS_OV_WARNING)
 118                         ret |= PB_VOLTAGE_OV_WARNING;
 119                 if (mfg_status & MAX8688_STATUS_OV_FAULT)
 120                         ret |= PB_VOLTAGE_OV_FAULT;
 121                 break;
 122         case PMBUS_STATUS_IOUT:
 123                 mfg_status = pmbus_read_word_data(client, 0,
 124                                                   MAX8688_MFG_STATUS);
 125                 if (mfg_status < 0)
 126                         return mfg_status;
 127                 if (mfg_status & MAX8688_STATUS_UC_FAULT)
 128                         ret |= PB_IOUT_UC_FAULT;
 129                 if (mfg_status & MAX8688_STATUS_OC_WARNING)
 130                         ret |= PB_IOUT_OC_WARNING;
 131                 if (mfg_status & MAX8688_STATUS_OC_FAULT)
 132                         ret |= PB_IOUT_OC_FAULT;
 133                 break;
 134         case PMBUS_STATUS_TEMPERATURE:
 135                 mfg_status = pmbus_read_word_data(client, 0,
 136                                                   MAX8688_MFG_STATUS);
 137                 if (mfg_status < 0)
 138                         return mfg_status;
 139                 if (mfg_status & MAX8688_STATUS_OT_WARNING)
 140                         ret |= PB_TEMP_OT_WARNING;
 141                 if (mfg_status & MAX8688_STATUS_OT_FAULT)
 142                         ret |= PB_TEMP_OT_FAULT;
 143                 break;
 144         default:
 145                 ret = -ENODATA;
 146                 break;
 147         }
 148         return ret;
 149 }
 150
 151 static struct pmbus_driver_info max8688_info = {
 152         .pages = 1,
 153         .format[PSC_VOLTAGE_IN] = direct,
 154         .format[PSC_VOLTAGE_OUT] = direct,
 155         .format[PSC_TEMPERATURE] = direct,
 156         .format[PSC_CURRENT_OUT] = direct,
 157         .m[PSC_VOLTAGE_IN] = 19995,
 158         .b[PSC_VOLTAGE_IN] = 0,
 159         .R[PSC_VOLTAGE_IN] = -1,
 160         .m[PSC_VOLTAGE_OUT] = 19995,
 161         .b[PSC_VOLTAGE_OUT] = 0,
 162         .R[PSC_VOLTAGE_OUT] = -1,
 163         .m[PSC_CURRENT_OUT] = 23109,
 164         .b[PSC_CURRENT_OUT] = 0,
 165         .R[PSC_CURRENT_OUT] = -2,
 166         .m[PSC_TEMPERATURE] = -7612,
 167         .b[PSC_TEMPERATURE] = 335,
 168         .R[PSC_TEMPERATURE] = -3,
 169         .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
 170                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
 171                 | PMBUS_HAVE_STATUS_TEMP,
 172         .read_byte_data = max8688_read_byte_data,
 173         .read_word_data = max8688_read_word_data,
 174         .write_word_data = max8688_write_word_data,
 175 };
 176
 177 static int max8688_probe(struct i2c_client *client,
 178                          const struct i2c_device_id *id)
 179 {
 180         return pmbus_do_probe(client, id, &max8688_info);
 181 }
 182
 183 static int max8688_remove(struct i2c_client *client)
 184 {
 185         pmbus_do_remove(client);
 186         return 0;
 187 }
 188
 189 static const struct i2c_device_id max8688_id[] = {
 190         {"max8688", 0},
 191         { }
 192 };
 193
 194 MODULE_DEVICE_TABLE(i2c, max8688_id);
 195
 196 /* This is the driver that will be inserted */
 197 static struct i2c_driver max8688_driver = {
 198         .driver = {
 199                    .name = "max8688",
 200                    },
 201         .probe = max8688_probe,
 202         .remove = max8688_remove,
 203         .id_table = max8688_id,
 204 };
 205
 206 static int __init max8688_init(void)
 207 {
 208         return i2c_add_driver(&max8688_driver);
 209 }
 210
 211 static void __exit max8688_exit(void)
 212 {
 213         i2c_del_driver(&max8688_driver);
 214 }
 215
 216 MODULE_AUTHOR("Guenter Roeck");
 217 MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
 218 MODULE_LICENSE("GPL");
 219 module_init(max8688_init);
 220 module_exit(max8688_exit);