LXR linux/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
  31static 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
  55static 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
  77static 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
 100static 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
 106static const struct i2c_device_id max16064_id[] = {
 107        {"max16064", 0},
 108        {}
 109};
 110
 111MODULE_DEVICE_TABLE(i2c, max16064_id);
 112
 113/* This is the driver that will be inserted */
 114static struct i2c_driver max16064_driver = {
 115        .driver = {
 116                   .name = "max16064",
 117                   },
 118        .probe = max16064_probe,
 119        .remove = pmbus_do_remove,
 120        .id_table = max16064_id,
 121};
 122
 123module_i2c_driver(max16064_driver);
 124
 125MODULE_AUTHOR("Guenter Roeck");
 126MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
 127MODULE_LICENSE("GPL");
 128