drivers/hwmon/pmbus/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_MFR_VOUT_PEAK          0xd4
  31 #define MAX34440_MFR_IOUT_PEAK          0xd5
  32 #define MAX34440_MFR_TEMPERATURE_PEAK   0xd6
  33
  34 #define MAX34440_STATUS_OC_WARN         (1 << 0)
  35 #define MAX34440_STATUS_OC_FAULT        (1 << 1)
  36 #define MAX34440_STATUS_OT_FAULT        (1 << 5)
  37 #define MAX34440_STATUS_OT_WARN         (1 << 6)
  38
  39 static int max34440_read_word_data(struct i2c_client *client, int page, int reg)
  40 {
  41         int ret;
  42
  43         switch (reg) {
  44         case PMBUS_VIRT_READ_VOUT_MAX:
  45                 ret = pmbus_read_word_data(client, page,
  46                                            MAX34440_MFR_VOUT_PEAK);
  47                 break;
  48         case PMBUS_VIRT_READ_IOUT_MAX:
  49                 ret = pmbus_read_word_data(client, page,
  50                                            MAX34440_MFR_IOUT_PEAK);
  51                 break;
  52         case PMBUS_VIRT_READ_TEMP_MAX:
  53                 ret = pmbus_read_word_data(client, page,
  54                                            MAX34440_MFR_TEMPERATURE_PEAK);
  55                 break;
  56         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  57         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  58         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  59                 ret = 0;
  60                 break;
  61         default:
  62                 ret = -ENODATA;
  63                 break;
  64         }
  65         return ret;
  66 }
  67
  68 static int max34440_write_word_data(struct i2c_client *client, int page,
  69                                     int reg, u16 word)
  70 {
  71         int ret;
  72
  73         switch (reg) {
  74         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  75                 ret = pmbus_write_word_data(client, page,
  76                                             MAX34440_MFR_VOUT_PEAK, 0);
  77                 break;
  78         case PMBUS_VIRT_RESET_IOUT_HISTORY:
  79                 ret = pmbus_write_word_data(client, page,
  80                                             MAX34440_MFR_IOUT_PEAK, 0);
  81                 break;
  82         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  83                 ret = pmbus_write_word_data(client, page,
  84                                             MAX34440_MFR_TEMPERATURE_PEAK,
  85                                             0xffff);
  86                 break;
  87         default:
  88                 ret = -ENODATA;
  89                 break;
  90         }
  91         return ret;
  92 }
  93
  94 static int max34440_read_byte_data(struct i2c_client *client, int page, int reg)
  95 {
  96         int ret;
  97         int mfg_status;
  98
  99         ret = pmbus_set_page(client, page);
 100         if (ret < 0)
 101                 return ret;
 102
 103         switch (reg) {
 104         case PMBUS_STATUS_IOUT:
 105                 mfg_status = pmbus_read_word_data(client, 0,
 106                                                   PMBUS_STATUS_MFR_SPECIFIC);
 107                 if (mfg_status < 0)
 108                         return mfg_status;
 109                 if (mfg_status & MAX34440_STATUS_OC_WARN)
 110                         ret |= PB_IOUT_OC_WARNING;
 111                 if (mfg_status & MAX34440_STATUS_OC_FAULT)
 112                         ret |= PB_IOUT_OC_FAULT;
 113                 break;
 114         case PMBUS_STATUS_TEMPERATURE:
 115                 mfg_status = pmbus_read_word_data(client, 0,
 116                                                   PMBUS_STATUS_MFR_SPECIFIC);
 117                 if (mfg_status < 0)
 118                         return mfg_status;
 119                 if (mfg_status & MAX34440_STATUS_OT_WARN)
 120                         ret |= PB_TEMP_OT_WARNING;
 121                 if (mfg_status & MAX34440_STATUS_OT_FAULT)
 122                         ret |= PB_TEMP_OT_FAULT;
 123                 break;
 124         default:
 125                 ret = -ENODATA;
 126                 break;
 127         }
 128         return ret;
 129 }
 130
 131 static struct pmbus_driver_info max34440_info[] = {
 132         [max34440] = {
 133                 .pages = 14,
 134                 .format[PSC_VOLTAGE_IN] = direct,
 135                 .format[PSC_VOLTAGE_OUT] = direct,
 136                 .format[PSC_TEMPERATURE] = direct,
 137                 .format[PSC_CURRENT_OUT] = direct,
 138                 .m[PSC_VOLTAGE_IN] = 1,
 139                 .b[PSC_VOLTAGE_IN] = 0,
 140                 .R[PSC_VOLTAGE_IN] = 3,     /* R = 0 in datasheet reflects mV */
 141                 .m[PSC_VOLTAGE_OUT] = 1,
 142                 .b[PSC_VOLTAGE_OUT] = 0,
 143                 .R[PSC_VOLTAGE_OUT] = 3,    /* R = 0 in datasheet reflects mV */
 144                 .m[PSC_CURRENT_OUT] = 1,
 145                 .b[PSC_CURRENT_OUT] = 0,
 146                 .R[PSC_CURRENT_OUT] = 3,    /* R = 0 in datasheet reflects mA */
 147                 .m[PSC_TEMPERATURE] = 1,
 148                 .b[PSC_TEMPERATURE] = 0,
 149                 .R[PSC_TEMPERATURE] = 2,
 150                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 151                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 152                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 153                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 154                 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 155                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 156                 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 157                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 158                 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 159                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 160                 .func[5] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 161                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 162                 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 163                 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 164                 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 165                 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 166                 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 167                 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 168                 .func[12] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 169                 .func[13] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 170                 .read_byte_data = max34440_read_byte_data,
 171                 .read_word_data = max34440_read_word_data,
 172                 .write_word_data = max34440_write_word_data,
 173         },
 174         [max34441] = {
 175                 .pages = 12,
 176                 .format[PSC_VOLTAGE_IN] = direct,
 177                 .format[PSC_VOLTAGE_OUT] = direct,
 178                 .format[PSC_TEMPERATURE] = direct,
 179                 .format[PSC_CURRENT_OUT] = direct,
 180                 .format[PSC_FAN] = direct,
 181                 .m[PSC_VOLTAGE_IN] = 1,
 182                 .b[PSC_VOLTAGE_IN] = 0,
 183                 .R[PSC_VOLTAGE_IN] = 3,
 184                 .m[PSC_VOLTAGE_OUT] = 1,
 185                 .b[PSC_VOLTAGE_OUT] = 0,
 186                 .R[PSC_VOLTAGE_OUT] = 3,
 187                 .m[PSC_CURRENT_OUT] = 1,
 188                 .b[PSC_CURRENT_OUT] = 0,
 189                 .R[PSC_CURRENT_OUT] = 3,
 190                 .m[PSC_TEMPERATURE] = 1,
 191                 .b[PSC_TEMPERATURE] = 0,
 192                 .R[PSC_TEMPERATURE] = 2,
 193                 .m[PSC_FAN] = 1,
 194                 .b[PSC_FAN] = 0,
 195                 .R[PSC_FAN] = 0,
 196                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 197                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 198                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 199                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 200                 .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 201                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 202                 .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 203                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 204                 .func[4] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 205                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
 206                 .func[5] = PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
 207                 .func[6] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 208                 .func[7] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 209                 .func[8] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 210                 .func[9] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 211                 .func[10] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 212                 .func[11] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 213                 .read_byte_data = max34440_read_byte_data,
 214                 .read_word_data = max34440_read_word_data,
 215                 .write_word_data = max34440_write_word_data,
 216         },
 217 };
 218
 219 static int max34440_probe(struct i2c_client *client,
 220                           const struct i2c_device_id *id)
 221 {
 222         return pmbus_do_probe(client, id, &max34440_info[id->driver_data]);
 223 }
 224
 225 static int max34440_remove(struct i2c_client *client)
 226 {
 227         pmbus_do_remove(client);
 228         return 0;
 229 }
 230
 231 static const struct i2c_device_id max34440_id[] = {
 232         {"max34440", max34440},
 233         {"max34441", max34441},
 234         {}
 235 };
 236
 237 MODULE_DEVICE_TABLE(i2c, max34440_id);
 238
 239 /* This is the driver that will be inserted */
 240 static struct i2c_driver max34440_driver = {
 241         .driver = {
 242                    .name = "max34440",
 243                    },
 244         .probe = max34440_probe,
 245         .remove = max34440_remove,
 246         .id_table = max34440_id,
 247 };
 248
 249 static int __init max34440_init(void)
 250 {
 251         return i2c_add_driver(&max34440_driver);
 252 }
 253
 254 static void __exit max34440_exit(void)
 255 {
 256         i2c_del_driver(&max34440_driver);
 257 }
 258
 259 MODULE_AUTHOR("Guenter Roeck");
 260 MODULE_DESCRIPTION("PMBus driver for Maxim MAX34440/MAX34441");
 261 MODULE_LICENSE("GPL");
 262 module_init(max34440_init);
 263 module_exit(max34440_exit);