drivers/hwmon/pmbus/xdpe12284.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
   4  *
   5  * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/i2c.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include "pmbus.h"
  14
  15 #define XDPE122_PROT_VR12_5MV           0x01 /* VR12.0 mode, 5-mV DAC */
  16 #define XDPE122_PROT_VR12_5_10MV        0x02 /* VR12.5 mode, 10-mV DAC */
  17 #define XDPE122_PROT_IMVP9_10MV         0x03 /* IMVP9 mode, 10-mV DAC */
  18 #define XDPE122_AMD_625MV               0x10 /* AMD mode 6.25mV */
  19 #define XDPE122_PAGE_NUM                2
  20
  21 static int xdpe122_read_word_data(struct i2c_client *client, int page,
  22                                   int phase, int reg)
  23 {
  24         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  25         long val;
  26         s16 exponent;
  27         s32 mantissa;
  28         int ret;
  29
  30         switch (reg) {
  31         case PMBUS_VOUT_OV_FAULT_LIMIT:
  32         case PMBUS_VOUT_UV_FAULT_LIMIT:
  33                 ret = pmbus_read_word_data(client, page, phase, reg);
  34                 if (ret < 0)
  35                         return ret;
  36
  37                 /* Convert register value to LINEAR11 data. */
  38                 exponent = ((s16)ret) >> 11;
  39                 mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
  40                 val = mantissa * 1000L;
  41                 if (exponent >= 0)
  42                         val <<= exponent;
  43                 else
  44                         val >>= -exponent;
  45
  46                 /* Convert data to VID register. */
  47                 switch (info->vrm_version[page]) {
  48                 case vr13:
  49                         if (val >= 500)
  50                                 return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
  51                         return 0;
  52                 case vr12:
  53                         if (val >= 250)
  54                                 return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
  55                         return 0;
  56                 case imvp9:
  57                         if (val >= 200)
  58                                 return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
  59                         return 0;
  60                 case amd625mv:
  61                         if (val >= 200 && val <= 1550)
  62                                 return DIV_ROUND_CLOSEST((1550 - val) * 100,
  63                                                          625);
  64                         return 0;
  65                 default:
  66                         return -EINVAL;
  67                 }
  68         default:
  69                 return -ENODATA;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int xdpe122_identify(struct i2c_client *client,
  76                             struct pmbus_driver_info *info)
  77 {
  78         u8 vout_params;
  79         int i, ret;
  80
  81         for (i = 0; i < XDPE122_PAGE_NUM; i++) {
  82                 /* Read the register with VOUT scaling value.*/
  83                 ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
  84                 if (ret < 0)
  85                         return ret;
  86
  87                 vout_params = ret & GENMASK(4, 0);
  88
  89                 switch (vout_params) {
  90                 case XDPE122_PROT_VR12_5_10MV:
  91                         info->vrm_version[i] = vr13;
  92                         break;
  93                 case XDPE122_PROT_VR12_5MV:
  94                         info->vrm_version[i] = vr12;
  95                         break;
  96                 case XDPE122_PROT_IMVP9_10MV:
  97                         info->vrm_version[i] = imvp9;
  98                         break;
  99                 case XDPE122_AMD_625MV:
 100                         info->vrm_version[i] = amd625mv;
 101                         break;
 102                 default:
 103                         return -EINVAL;
 104                 }
 105         }
 106
 107         return 0;
 108 }
 109
 110 static struct pmbus_driver_info xdpe122_info = {
 111         .pages = XDPE122_PAGE_NUM,
 112         .format[PSC_VOLTAGE_IN] = linear,
 113         .format[PSC_VOLTAGE_OUT] = vid,
 114         .format[PSC_TEMPERATURE] = linear,
 115         .format[PSC_CURRENT_IN] = linear,
 116         .format[PSC_CURRENT_OUT] = linear,
 117         .format[PSC_POWER] = linear,
 118         .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 119                 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 120                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
 121                 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
 122         .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 123                 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 124                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
 125                 PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
 126         .identify = xdpe122_identify,
 127         .read_word_data = xdpe122_read_word_data,
 128 };
 129
 130 static int xdpe122_probe(struct i2c_client *client)
 131 {
 132         struct pmbus_driver_info *info;
 133
 134         info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
 135                             GFP_KERNEL);
 136         if (!info)
 137                 return -ENOMEM;
 138
 139         return pmbus_do_probe(client, info);
 140 }
 141
 142 static const struct i2c_device_id xdpe122_id[] = {
 143         {"xdpe12254", 0},
 144         {"xdpe12284", 0},
 145         {}
 146 };
 147
 148 MODULE_DEVICE_TABLE(i2c, xdpe122_id);
 149
 150 static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
 151         {.compatible = "infineon,xdpe12254"},
 152         {.compatible = "infineon,xdpe12284"},
 153         {}
 154 };
 155 MODULE_DEVICE_TABLE(of, xdpe122_of_match);
 156
 157 static struct i2c_driver xdpe122_driver = {
 158         .driver = {
 159                 .name = "xdpe12284",
 160                 .of_match_table = of_match_ptr(xdpe122_of_match),
 161         },
 162         .probe_new = xdpe122_probe,
 163         .id_table = xdpe122_id,
 164 };
 165
 166 module_i2c_driver(xdpe122_driver);
 167
 168 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 169 MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
 170 MODULE_LICENSE("GPL");