drivers/hwmon/pmbus/max16064.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for Maxim MAX16064
   4  *
   5  * Copyright (c) 2011 Ericsson AB.
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/err.h>
  12 #include <linux/i2c.h>
  13 #include "pmbus.h"
  14
  15 #define MAX16064_MFR_VOUT_PEAK          0xd4
  16 #define MAX16064_MFR_TEMPERATURE_PEAK   0xd6
  17
  18 static int max16064_read_word_data(struct i2c_client *client, int page,
  19                                    int phase, int reg)
  20 {
  21         int ret;
  22
  23         switch (reg) {
  24         case PMBUS_VIRT_READ_VOUT_MAX:
  25                 ret = pmbus_read_word_data(client, page, phase,
  26                                            MAX16064_MFR_VOUT_PEAK);
  27                 break;
  28         case PMBUS_VIRT_READ_TEMP_MAX:
  29                 ret = pmbus_read_word_data(client, page, phase,
  30                                            MAX16064_MFR_TEMPERATURE_PEAK);
  31                 break;
  32         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  33         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  34                 ret = 0;
  35                 break;
  36         default:
  37                 ret = -ENODATA;
  38                 break;
  39         }
  40         return ret;
  41 }
  42
  43 static int max16064_write_word_data(struct i2c_client *client, int page,
  44                                     int reg, u16 word)
  45 {
  46         int ret;
  47
  48         switch (reg) {
  49         case PMBUS_VIRT_RESET_VOUT_HISTORY:
  50                 ret = pmbus_write_word_data(client, page,
  51                                             MAX16064_MFR_VOUT_PEAK, 0);
  52                 break;
  53         case PMBUS_VIRT_RESET_TEMP_HISTORY:
  54                 ret = pmbus_write_word_data(client, page,
  55                                             MAX16064_MFR_TEMPERATURE_PEAK,
  56                                             0xffff);
  57                 break;
  58         default:
  59                 ret = -ENODATA;
  60                 break;
  61         }
  62         return ret;
  63 }
  64
  65 static struct pmbus_driver_info max16064_info = {
  66         .pages = 4,
  67         .format[PSC_VOLTAGE_IN] = direct,
  68         .format[PSC_VOLTAGE_OUT] = direct,
  69         .format[PSC_TEMPERATURE] = direct,
  70         .m[PSC_VOLTAGE_IN] = 19995,
  71         .b[PSC_VOLTAGE_IN] = 0,
  72         .R[PSC_VOLTAGE_IN] = -1,
  73         .m[PSC_VOLTAGE_OUT] = 19995,
  74         .b[PSC_VOLTAGE_OUT] = 0,
  75         .R[PSC_VOLTAGE_OUT] = -1,
  76         .m[PSC_TEMPERATURE] = -7612,
  77         .b[PSC_TEMPERATURE] = 335,
  78         .R[PSC_TEMPERATURE] = -3,
  79         .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
  80                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
  81         .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  82         .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  83         .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
  84         .read_word_data = max16064_read_word_data,
  85         .write_word_data = max16064_write_word_data,
  86 };
  87
  88 static int max16064_probe(struct i2c_client *client)
  89 {
  90         return pmbus_do_probe(client, &max16064_info);
  91 }
  92
  93 static const struct i2c_device_id max16064_id[] = {
  94         {"max16064", 0},
  95         {}
  96 };
  97
  98 MODULE_DEVICE_TABLE(i2c, max16064_id);
  99
 100 /* This is the driver that will be inserted */
 101 static struct i2c_driver max16064_driver = {
 102         .driver = {
 103                    .name = "max16064",
 104                    },
 105         .probe_new = max16064_probe,
 106         .id_table = max16064_id,
 107 };
 108
 109 module_i2c_driver(max16064_driver);
 110
 111 MODULE_AUTHOR("Guenter Roeck");
 112 MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
 113 MODULE_LICENSE("GPL");