drivers/hwmon/pmbus/tps53679.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for Texas Instruments TPS53679
   4  *
   5  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
   6  * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/i2c.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include "pmbus.h"
  15
  16 #define TPS53679_PROT_VR12_5MV          0x01 /* VR12.0 mode, 5-mV DAC */
  17 #define TPS53679_PROT_VR12_5_10MV       0x02 /* VR12.5 mode, 10-mV DAC */
  18 #define TPS53679_PROT_VR13_10MV         0x04 /* VR13.0 mode, 10-mV DAC */
  19 #define TPS53679_PROT_IMVP8_5MV         0x05 /* IMVP8 mode, 5-mV DAC */
  20 #define TPS53679_PROT_VR13_5MV          0x07 /* VR13.0 mode, 5-mV DAC */
  21 #define TPS53679_PAGE_NUM               2
  22
  23 static int tps53679_identify(struct i2c_client *client,
  24                              struct pmbus_driver_info *info)
  25 {
  26         u8 vout_params;
  27         int i, ret;
  28
  29         for (i = 0; i < TPS53679_PAGE_NUM; i++) {
  30                 /* Read the register with VOUT scaling value.*/
  31                 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
  32                 if (ret < 0)
  33                         return ret;
  34
  35                 vout_params = ret & GENMASK(4, 0);
  36
  37                 switch (vout_params) {
  38                 case TPS53679_PROT_VR13_10MV:
  39                 case TPS53679_PROT_VR12_5_10MV:
  40                         info->vrm_version[i] = vr13;
  41                         break;
  42                 case TPS53679_PROT_VR13_5MV:
  43                 case TPS53679_PROT_VR12_5MV:
  44                 case TPS53679_PROT_IMVP8_5MV:
  45                         info->vrm_version[i] = vr12;
  46                         break;
  47                 default:
  48                         return -EINVAL;
  49                 }
  50         }
  51
  52         return 0;
  53 }
  54
  55 static struct pmbus_driver_info tps53679_info = {
  56         .pages = TPS53679_PAGE_NUM,
  57         .format[PSC_VOLTAGE_IN] = linear,
  58         .format[PSC_VOLTAGE_OUT] = vid,
  59         .format[PSC_TEMPERATURE] = linear,
  60         .format[PSC_CURRENT_OUT] = linear,
  61         .format[PSC_POWER] = linear,
  62         .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  63                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  64                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
  65                 PMBUS_HAVE_POUT,
  66         .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  67                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  68                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
  69                 PMBUS_HAVE_POUT,
  70         .identify = tps53679_identify,
  71 };
  72
  73 static int tps53679_probe(struct i2c_client *client,
  74                           const struct i2c_device_id *id)
  75 {
  76         struct pmbus_driver_info *info;
  77
  78         info = devm_kmemdup(&client->dev, &tps53679_info, sizeof(*info),
  79                             GFP_KERNEL);
  80         if (!info)
  81                 return -ENOMEM;
  82
  83         return pmbus_do_probe(client, id, info);
  84 }
  85
  86 static const struct i2c_device_id tps53679_id[] = {
  87         {"tps53679", 0},
  88         {"tps53688", 0},
  89         {}
  90 };
  91
  92 MODULE_DEVICE_TABLE(i2c, tps53679_id);
  93
  94 static const struct of_device_id __maybe_unused tps53679_of_match[] = {
  95         {.compatible = "ti,tps53679"},
  96         {.compatible = "ti,tps53688"},
  97         {}
  98 };
  99 MODULE_DEVICE_TABLE(of, tps53679_of_match);
 100
 101 static struct i2c_driver tps53679_driver = {
 102         .driver = {
 103                 .name = "tps53679",
 104                 .of_match_table = of_match_ptr(tps53679_of_match),
 105         },
 106         .probe = tps53679_probe,
 107         .remove = pmbus_do_remove,
 108         .id_table = tps53679_id,
 109 };
 110
 111 module_i2c_driver(tps53679_driver);
 112
 113 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 114 MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679");
 115 MODULE_LICENSE("GPL");