drivers/hwmon/pmbus/tps53679.c

   1 /*
   2  * Hardware monitoring driver for Texas Instruments TPS53679
   3  *
   4  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
   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/err.h>
  19 #include <linux/i2c.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include "pmbus.h"
  24
  25 #define TPS53679_PROT_VR12_5MV          0x01 /* VR12.0 mode, 5-mV DAC */
  26 #define TPS53679_PROT_VR12_5_10MV       0x02 /* VR12.5 mode, 10-mV DAC */
  27 #define TPS53679_PROT_VR13_10MV         0x04 /* VR13.0 mode, 10-mV DAC */
  28 #define TPS53679_PROT_IMVP8_5MV         0x05 /* IMVP8 mode, 5-mV DAC */
  29 #define TPS53679_PROT_VR13_5MV          0x07 /* VR13.0 mode, 5-mV DAC */
  30 #define TPS53679_PAGE_NUM               2
  31
  32 static int tps53679_identify(struct i2c_client *client,
  33                              struct pmbus_driver_info *info)
  34 {
  35         u8 vout_params;
  36         int ret;
  37
  38         /* Read the register with VOUT scaling value.*/
  39         ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
  40         if (ret < 0)
  41                 return ret;
  42
  43         vout_params = ret & GENMASK(4, 0);
  44
  45         switch (vout_params) {
  46         case TPS53679_PROT_VR13_10MV:
  47         case TPS53679_PROT_VR12_5_10MV:
  48                 info->vrm_version = vr13;
  49                 break;
  50         case TPS53679_PROT_VR13_5MV:
  51         case TPS53679_PROT_VR12_5MV:
  52         case TPS53679_PROT_IMVP8_5MV:
  53                 info->vrm_version = vr12;
  54                 break;
  55         default:
  56                 return -EINVAL;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static struct pmbus_driver_info tps53679_info = {
  63         .pages = TPS53679_PAGE_NUM,
  64         .format[PSC_VOLTAGE_IN] = linear,
  65         .format[PSC_VOLTAGE_OUT] = vid,
  66         .format[PSC_TEMPERATURE] = linear,
  67         .format[PSC_CURRENT_OUT] = linear,
  68         .format[PSC_POWER] = linear,
  69         .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  70                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  71                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
  72                 PMBUS_HAVE_POUT,
  73         .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  74                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  75                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
  76                 PMBUS_HAVE_POUT,
  77         .identify = tps53679_identify,
  78 };
  79
  80 static int tps53679_probe(struct i2c_client *client,
  81                           const struct i2c_device_id *id)
  82 {
  83         struct pmbus_driver_info *info;
  84
  85         info = devm_kmemdup(&client->dev, &tps53679_info, sizeof(*info),
  86                             GFP_KERNEL);
  87         if (!info)
  88                 return -ENOMEM;
  89
  90         return pmbus_do_probe(client, id, info);
  91 }
  92
  93 static const struct i2c_device_id tps53679_id[] = {
  94         {"tps53679", 0},
  95         {}
  96 };
  97
  98 MODULE_DEVICE_TABLE(i2c, tps53679_id);
  99
 100 static const struct of_device_id __maybe_unused tps53679_of_match[] = {
 101         {.compatible = "ti,tps53679"},
 102         {}
 103 };
 104 MODULE_DEVICE_TABLE(of, tps53679_of_match);
 105
 106 static struct i2c_driver tps53679_driver = {
 107         .driver = {
 108                 .name = "tps53679",
 109                 .of_match_table = of_match_ptr(tps53679_of_match),
 110         },
 111         .probe = tps53679_probe,
 112         .remove = pmbus_do_remove,
 113         .id_table = tps53679_id,
 114 };
 115
 116 module_i2c_driver(tps53679_driver);
 117
 118 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 119 MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679");
 120 MODULE_LICENSE("GPL");