drivers/hwmon/max34440.c

   1 /*
   2  * Hardware monitoring driver for Maxim MAX34440/MAX34441
   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 enum chips { max34440, max34441 };
  29
  30 #define MAX34440_STATUS_OC_WARN         (1 << 0)
  31 #define MAX34440_STATUS_OC_FAULT        (1 << 1)
  32 #define MAX34440_STATUS_OT_FAULT        (1 << 5)
  33 #define MAX34440_STATUS_OT_WARN         (1 << 6)
  34
  35 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
  36 {
  37         int ret;
  38         int mfg_status;
  39
  40         ret = pmbus_set_page(client, page);
  41         if (ret < 0)
  42                 return ret;
  43
  44         switch (reg) {
  45         case PMBUS_STATUS_IOUT:
  46                 mfg_status = pmbus_read_word_data(client, 0,
  47                                                   PMBUS_STATUS_MFR_SPECIFIC);
  48                 if (mfg_status < 0)
  49                         return mfg_status;
  50                 if (mfg_status & MAX34440_STATUS_OC_WARN)
  51                         ret |= PB_IOUT_OC_WARNING;
  52                 if (mfg_status & MAX34440_STATUS_OC_FAULT)
  53                         ret |= PB_IOUT_OC_FAULT;
  54                 break;
  55         case PMBUS_STATUS_TEMPERATURE:
  56                 mfg_status = pmbus_read_word_data(client, 0,
  57                                                   PMBUS_STATUS_MFR_SPECIFIC);
  58                 if (mfg_status < 0)
  59                         return mfg_status;
  60                 if (mfg_status & MAX34440_STATUS_OT_WARN)
  61                         ret |= PB_TEMP_OT_WARNING;
  62                 if (mfg_status & MAX34440_STATUS_OT_FAULT)
  63                         ret |= PB_TEMP_OT_FAULT;
  64                 break;
  65         default:
  66                 ret = -ENODATA;
  67                 break;
  68         }
  69         return ret;
  70 }
  71
  72 static struct pmbus_driver_info max34440_info[] = {
  73         [max34440] = {
  74                 .pages = 14,
  75                 .direct[PSC_VOLTAGE_IN] = true,
  76                 .direct[PSC_VOLTAGE_OUT] = true,
  77                 .direct[PSC_TEMPERATURE] = true,
  78                 .direct[PSC_CURRENT_OUT] = true,
  79                 .m[PSC_VOLTAGE_IN] = 1,
  80                 .b[PSC_VOLTAGE_IN] = 0,
  81                 .R[PSC_VOLTAGE_IN] = 3,     /* R = 0 in datasheet reflects mV */
  82                 .m[PSC_VOLTAGE_OUT] = 1,
  83                 .b[PSC_VOLTAGE_OUT] = 0,
  84                 .R[PSC_VOLTAGE_OUT] = 3,    /* R = 0 in datasheet reflects mV */
  85                 .m[PSC_CURRENT_OUT] = 1,
  86                 .b[PSC_CURRENT_OUT] = 0,
  87                 .R[PSC_CURRENT_OUT] = 3,    /* R = 0 in datasheet reflects mA */
  88                 .m[PSC_TEMPERATURE] = 1,
  89                 .b[PSC_TEMPERATURE] = 0,
  90                 .R[PSC_TEMPERATURE] = 2,
  91                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
  92                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
  93                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
  94                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
  95                 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
  96                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
  97                 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
  98                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
  99                 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 100                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 101                 .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 102                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 103                 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 104                 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 105                 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 106                 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 107                 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 108                 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 109                 .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 110                 .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 111                 .read_byte_data = max34440_read_byte_data,
 112         },
 113         [max34441] = {
 114                 .pages = 12,
 115                 .direct[PSC_VOLTAGE_IN] = true,
 116                 .direct[PSC_VOLTAGE_OUT] = true,
 117                 .direct[PSC_TEMPERATURE] = true,
 118                 .direct[PSC_CURRENT_OUT] = true,
 119                 .direct[PSC_FAN] = true,
 120                 .m[PSC_VOLTAGE_IN] = 1,
 121                 .b[PSC_VOLTAGE_IN] = 0,
 122                 .R[PSC_VOLTAGE_IN] = 3,
 123                 .m[PSC_VOLTAGE_OUT] = 1,
 124                 .b[PSC_VOLTAGE_OUT] = 0,
 125                 .R[PSC_VOLTAGE_OUT] = 3,
 126                 .m[PSC_CURRENT_OUT] = 1,
 127                 .b[PSC_CURRENT_OUT] = 0,
 128                 .R[PSC_CURRENT_OUT] = 3,
 129                 .m[PSC_TEMPERATURE] = 1,
 130                 .b[PSC_TEMPERATURE] = 0,
 131                 .R[PSC_TEMPERATURE] = 2,
 132                 .m[PSC_FAN] = 1,
 133                 .b[PSC_FAN] = 0,
 134                 .R[PSC_FAN] = 0,
 135                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 136                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 137                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 138                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 139                 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 140                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 141                 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 142                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 143                 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 144                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 145                 .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
 146                 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 147                 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 148                 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 149                 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 150                 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 151                 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 152                 .read_byte_data = max34440_read_byte_data,
 153         },
 154 };
 155
 156 static int max34440_probe(struct i2c_client *client,
 157                           const struct i2c_device_id *id)
 158 {
 159         return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
 160 }
 161
 162 static int max34440_remove(struct i2c_client *client)
 163 {
 164         return pmbus_do_remove(client);
 165 }
 166
 167 static const struct i2c_device_id max34440_id[] = {
 168         {"max34440", max34440},
 169         {"max34441", max34441},
 170         {}
 171 };
 172
 173 MODULE_DEVICE_TABLE(i2c, max34440_id);
 174
 175 /* This is the driver that will be inserted */
 176 static struct i2c_driver max34440_driver = {
 177         .driver = {
 178                    .name = "max34440",
 179                    },
 180         .probe = max34440_probe,
 181         .remove = max34440_remove,
 182         .id_table = max34440_id,
 183 };
 184
 185 static int __init max34440_init(void)
 186 {
 187         return i2c_add_driver(&max34440_driver);
 188 }
 189
 190 static void __exit max34440_exit(void)
 191 {
 192         i2c_del_driver(&max34440_driver);
 193 }
 194
 195 MODULE_AUTHOR("Guenter Roeck");
 196 MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
 197 MODULE_LICENSE("GPL");
 198 module_init(max34440_init);
 199 module_exit(max34440_exit);