drivers/hwmon/pmbus/max16064.c

   1 /*
   2  * Hardware monitoring driver for Maxim MAX16064
   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 MAX16064_MFR_VOUT_PEAK          0xd4
  29 #define MAX16064_MFR_TEMPERATURE_PEAK   0xd6
  30
  31 static int max16064_read_word_data(struct i2c_client *client, int page, int reg)
  32 {
  33         int ret;
  34
  35         switch (reg) {
  36         case PMBUS_VIRT_READ_VOUT_MAX:
  37                 ret = pmbus_read_word_data(client, page,
  38                                            MAX16064_MFR_VOUT_PEAK);
  39                 break;
  40         case PMBUS_VIRT_READ_TEMP_MAX:
  41                 ret = pmbus_read_word_data(client, page,
  42                                            MAX16064_MFR_TEMPERATURE_PEAK);
  43                 break;
  44         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  45         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  46                 ret = 0;
  47                 break;
  48         default:
  49                 ret = -ENODATA;
  50                 break;
  51         }
  52         return ret;
  53 }
  54
  55 static int max16064_write_word_data(struct i2c_client *client, int page,
  56                                     int reg, u16 word)
  57 {
  58         int ret;
  59
  60         switch (reg) {
  61         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  62                 ret = pmbus_write_word_data(client, page,
  63                                             MAX16064_MFR_VOUT_PEAK, 0);
  64                 break;
  65         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  66                 ret = pmbus_write_word_data(client, page,
  67                                             MAX16064_MFR_TEMPERATURE_PEAK,
  68                                             0xffff);
  69                 break;
  70         default:
  71                 ret = -ENODATA;
  72                 break;
  73         }
  74         return ret;
  75 }
  76
  77 static struct pmbus_driver_info max16064_info = {
  78         .pages = 4,
  79         .format[PSC_VOLTAGE_IN] = direct,
  80         .format[PSC_VOLTAGE_OUT] = direct,
  81         .format[PSC_TEMPERATURE] = direct,
  82         .m[PSC_VOLTAGE_IN] = 19995,
  83         .b[PSC_VOLTAGE_IN] = 0,
  84         .R[PSC_VOLTAGE_IN] = -1,
  85         .m[PSC_VOLTAGE_OUT] = 19995,
  86         .b[PSC_VOLTAGE_OUT] = 0,
  87         .R[PSC_VOLTAGE_OUT] = -1,
  88         .m[PSC_TEMPERATURE] = -7612,
  89         .b[PSC_TEMPERATURE] = 335,
  90         .R[PSC_TEMPERATURE] = -3,
  91         .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
  92                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
  93         .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  94         .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  95         .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  96         .read_word_data = max16064_read_word_data,
  97         .write_word_data = max16064_write_word_data,
  98 };
  99
 100 static int max16064_probe(struct i2c_client *client,
 101                           const struct i2c_device_id *id)
 102 {
 103         return pmbus_do_probe(client, id, &max16064_info);
 104 }
 105
 106 static int max16064_remove(struct i2c_client *client)
 107 {
 108         pmbus_do_remove(client);
 109         return 0;
 110 }
 111
 112 static const struct i2c_device_id max16064_id[] = {
 113         {"max16064", 0},
 114         {}
 115 };
 116
 117 MODULE_DEVICE_TABLE(i2c, max16064_id);
 118
 119 /* This is the driver that will be inserted */
 120 static struct i2c_driver max16064_driver = {
 121         .driver = {
 122                    .name = "max16064",
 123                    },
 124         .probe = max16064_probe,
 125         .remove = max16064_remove,
 126         .id_table = max16064_id,
 127 };
 128
 129 static int __init max16064_init(void)
 130 {
 131         return i2c_add_driver(&max16064_driver);
 132 }
 133
 134 static void __exit max16064_exit(void)
 135 {
 136         i2c_del_driver(&max16064_driver);
 137 }
 138
 139 MODULE_AUTHOR("Guenter Roeck");
 140 MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
 141 MODULE_LICENSE("GPL");
 142 module_init(max16064_init);
 143 module_exit(max16064_exit);