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/bitops.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/err.h>
  26 #include <linux/i2c.h>
  27 #include "pmbus.h"
  28
  29 #define MAX8688_MFR_VOUT_PEAK           0xd4
  30 #define MAX8688_MFR_IOUT_PEAK           0xd5
  31 #define MAX8688_MFR_TEMPERATURE_PEAK    0xd6
  32 #define MAX8688_MFG_STATUS              0xd8
  33
  34 #define MAX8688_STATUS_OC_FAULT         BIT(4)
  35 #define MAX8688_STATUS_OV_FAULT         BIT(5)
  36 #define MAX8688_STATUS_OV_WARNING       BIT(8)
  37 #define MAX8688_STATUS_UV_FAULT         BIT(9)
  38 #define MAX8688_STATUS_UV_WARNING       BIT(10)
  39 #define MAX8688_STATUS_UC_FAULT         BIT(11)
  40 #define MAX8688_STATUS_OC_WARNING       BIT(12)
  41 #define MAX8688_STATUS_OT_FAULT         BIT(13)
  42 #define MAX8688_STATUS_OT_WARNING       BIT(14)
  43
  44 static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
  45 {
  46         int ret;
  47
  48         if (page)
  49                 return -ENXIO;
  50
  51         switch (reg) {
  52         case PMBUS_VIRT_READ_VOUT_MAX:
  53                 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_VOUT_PEAK);
  54                 break;
  55         case PMBUS_VIRT_READ_IOUT_MAX:
  56                 ret = pmbus_read_word_data(client, 0, MAX8688_MFR_IOUT_PEAK);
  57                 break;
  58         case PMBUS_VIRT_READ_TEMP_MAX:
  59                 ret = pmbus_read_word_data(client, 0,
  60                                            MAX8688_MFR_TEMPERATURE_PEAK);
  61                 break;
  62         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  63         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  64         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  65                 ret = 0;
  66                 break;
  67         default:
  68                 ret = -ENODATA;
  69                 break;
  70         }
  71         return ret;
  72 }
  73
  74 static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
  75                                    u16 word)
  76 {
  77         int ret;
  78
  79         switch (reg) {
  80         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  81                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
  82                                             0);
  83                 break;
  84         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  85                 ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
  86                                             0);
  87                 break;
  88         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  89                 ret = pmbus_write_word_data(client, 0,
  90                                             MAX8688_MFR_TEMPERATURE_PEAK,
  91                                             0xffff);
  92                 break;
  93         default:
  94                 ret = -ENODATA;
  95                 break;
  96         }
  97         return ret;
  98 }
  99
 100 static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
 101 {
 102         int ret = 0;
 103         int mfg_status;
 104
 105         if (page > 0)
 106                 return -ENXIO;
 107
 108         switch (reg) {
 109         case PMBUS_STATUS_VOUT:
 110                 mfg_status = pmbus_read_word_data(client, 0,
 111                                                   MAX8688_MFG_STATUS);
 112                 if (mfg_status < 0)
 113                         return mfg_status;
 114                 if (mfg_status & MAX8688_STATUS_UV_WARNING)
 115                         ret |= PB_VOLTAGE_UV_WARNING;
 116                 if (mfg_status & MAX8688_STATUS_UV_FAULT)
 117                         ret |= PB_VOLTAGE_UV_FAULT;
 118                 if (mfg_status & MAX8688_STATUS_OV_WARNING)
 119                         ret |= PB_VOLTAGE_OV_WARNING;
 120                 if (mfg_status & MAX8688_STATUS_OV_FAULT)
 121                         ret |= PB_VOLTAGE_OV_FAULT;
 122                 break;
 123         case PMBUS_STATUS_IOUT:
 124                 mfg_status = pmbus_read_word_data(client, 0,
 125                                                   MAX8688_MFG_STATUS);
 126                 if (mfg_status < 0)
 127                         return mfg_status;
 128                 if (mfg_status & MAX8688_STATUS_UC_FAULT)
 129                         ret |= PB_IOUT_UC_FAULT;
 130                 if (mfg_status & MAX8688_STATUS_OC_WARNING)
 131                         ret |= PB_IOUT_OC_WARNING;
 132                 if (mfg_status & MAX8688_STATUS_OC_FAULT)
 133                         ret |= PB_IOUT_OC_FAULT;
 134                 break;
 135         case PMBUS_STATUS_TEMPERATURE:
 136                 mfg_status = pmbus_read_word_data(client, 0,
 137                                                   MAX8688_MFG_STATUS);
 138                 if (mfg_status < 0)
 139                         return mfg_status;
 140                 if (mfg_status & MAX8688_STATUS_OT_WARNING)
 141                         ret |= PB_TEMP_OT_WARNING;
 142                 if (mfg_status & MAX8688_STATUS_OT_FAULT)
 143                         ret |= PB_TEMP_OT_FAULT;
 144                 break;
 145         default:
 146                 ret = -ENODATA;
 147                 break;
 148         }
 149         return ret;
 150 }
 151
 152 static struct pmbus_driver_info max8688_info = {
 153         .pages = 1,
 154         .format[PSC_VOLTAGE_IN] = direct,
 155         .format[PSC_VOLTAGE_OUT] = direct,
 156         .format[PSC_TEMPERATURE] = direct,
 157         .format[PSC_CURRENT_OUT] = direct,
 158         .m[PSC_VOLTAGE_IN] = 19995,
 159         .b[PSC_VOLTAGE_IN] = 0,
 160         .R[PSC_VOLTAGE_IN] = -1,
 161         .m[PSC_VOLTAGE_OUT] = 19995,
 162         .b[PSC_VOLTAGE_OUT] = 0,
 163         .R[PSC_VOLTAGE_OUT] = -1,
 164         .m[PSC_CURRENT_OUT] = 23109,
 165         .b[PSC_CURRENT_OUT] = 0,
 166         .R[PSC_CURRENT_OUT] = -2,
 167         .m[PSC_TEMPERATURE] = -7612,
 168         .b[PSC_TEMPERATURE] = 335,
 169         .R[PSC_TEMPERATURE] = -3,
 170         .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP
 171                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
 172                 | PMBUS_HAVE_STATUS_TEMP,
 173         .read_byte_data = max8688_read_byte_data,
 174         .read_word_data = max8688_read_word_data,
 175         .write_word_data = max8688_write_word_data,
 176 };
 177
 178 static int max8688_probe(struct i2c_client *client,
 179                          const struct i2c_device_id *id)
 180 {
 181         return pmbus_do_probe(client, id, &max8688_info);
 182 }
 183
 184 static const struct i2c_device_id max8688_id[] = {
 185         {"max8688", 0},
 186         { }
 187 };
 188
 189 MODULE_DEVICE_TABLE(i2c, max8688_id);
 190
 191 /* This is the driver that will be inserted */
 192 static struct i2c_driver max8688_driver = {
 193         .driver = {
 194                    .name = "max8688",
 195                    },
 196         .probe = max8688_probe,
 197         .remove = pmbus_do_remove,
 198         .id_table = max8688_id,
 199 };
 200
 201 module_i2c_driver(max8688_driver);
 202
 203 MODULE_AUTHOR("Guenter Roeck");
 204 MODULE_DESCRIPTION("PMBus driver for Maxim MAX8688");
 205 MODULE_LICENSE("GPL");