drivers/hwmon/adm1275.c

   1 /*
   2  * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
   3  * and Digital Power Monitor
   4  *
   5  * Copyright (c) 2011 Ericsson AB.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 #include <linux/i2c.h>
  24 #include "pmbus.h"
  25
  26 #define ADM1275_PMON_CONFIG             0xd4
  27
  28 #define ADM1275_VIN_VOUT_SELECT         (1 << 6)
  29 #define ADM1275_VRANGE                  (1 << 5)
  30
  31 static int adm1275_probe(struct i2c_client *client,
  32                          const struct i2c_device_id *id)
  33 {
  34         int config;
  35         int ret;
  36         struct pmbus_driver_info *info;
  37
  38         if (!i2c_check_functionality(client->adapter,
  39                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
  40                 return -ENODEV;
  41
  42         info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
  43         if (!info)
  44                 return -ENOMEM;
  45
  46         config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
  47         if (config < 0) {
  48                 ret = config;
  49                 goto err_mem;
  50         }
  51
  52         info->pages = 1;
  53         info->direct[PSC_VOLTAGE_IN] = true;
  54         info->direct[PSC_VOLTAGE_OUT] = true;
  55         info->direct[PSC_CURRENT_OUT] = true;
  56         info->m[PSC_CURRENT_OUT] = 807;
  57         info->b[PSC_CURRENT_OUT] = 20475;
  58         info->R[PSC_CURRENT_OUT] = -1;
  59         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
  60
  61         if (config & ADM1275_VRANGE) {
  62                 info->m[PSC_VOLTAGE_IN] = 19199;
  63                 info->b[PSC_VOLTAGE_IN] = 0;
  64                 info->R[PSC_VOLTAGE_IN] = -2;
  65                 info->m[PSC_VOLTAGE_OUT] = 19199;
  66                 info->b[PSC_VOLTAGE_OUT] = 0;
  67                 info->R[PSC_VOLTAGE_OUT] = -2;
  68         } else {
  69                 info->m[PSC_VOLTAGE_IN] = 6720;
  70                 info->b[PSC_VOLTAGE_IN] = 0;
  71                 info->R[PSC_VOLTAGE_IN] = -1;
  72                 info->m[PSC_VOLTAGE_OUT] = 6720;
  73                 info->b[PSC_VOLTAGE_OUT] = 0;
  74                 info->R[PSC_VOLTAGE_OUT] = -1;
  75         }
  76
  77         if (config & ADM1275_VIN_VOUT_SELECT)
  78                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  79         else
  80                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
  81
  82         ret = pmbus_do_probe(client, id, info);
  83         if (ret)
  84                 goto err_mem;
  85         return 0;
  86
  87 err_mem:
  88         kfree(info);
  89         return ret;
  90 }
  91
  92 static int adm1275_remove(struct i2c_client *client)
  93 {
  94         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  95         int ret;
  96
  97         ret = pmbus_do_remove(client);
  98         kfree(info);
  99         return ret;
 100 }
 101
 102 static const struct i2c_device_id adm1275_id[] = {
 103         {"adm1275", 0},
 104         { }
 105 };
 106 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 107
 108 static struct i2c_driver adm1275_driver = {
 109         .driver = {
 110                    .name = "adm1275",
 111                    },
 112         .probe = adm1275_probe,
 113         .remove = adm1275_remove,
 114         .id_table = adm1275_id,
 115 };
 116
 117 static int __init adm1275_init(void)
 118 {
 119         return i2c_add_driver(&adm1275_driver);
 120 }
 121
 122 static void __exit adm1275_exit(void)
 123 {
 124         i2c_del_driver(&adm1275_driver);
 125 }
 126
 127 MODULE_AUTHOR("Guenter Roeck");
 128 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
 129 MODULE_LICENSE("GPL");
 130 module_init(adm1275_init);
 131 module_exit(adm1275_exit);