drivers/hwmon/pmbus/pxe1610.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Hardware monitoring driver for Infineon PXE1610
   4  *
   5  * Copyright (c) 2019 Facebook Inc
   6  *
   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 PXE1610_NUM_PAGES 3
  17
  18 /* Identify chip parameters. */
  19 static int pxe1610_identify(struct i2c_client *client,
  20                              struct pmbus_driver_info *info)
  21 {
  22         int i;
  23
  24         for (i = 0; i < PXE1610_NUM_PAGES; i++) {
  25                 if (pmbus_check_byte_register(client, i, PMBUS_VOUT_MODE)) {
  26                         u8 vout_mode;
  27                         int ret;
  28
  29                         /* Read the register with VOUT scaling value.*/
  30                         ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
  31                         if (ret < 0)
  32                                 return ret;
  33
  34                         vout_mode = ret & GENMASK(4, 0);
  35
  36                         switch (vout_mode) {
  37                         case 1:
  38                                 info->vrm_version[i] = vr12;
  39                                 break;
  40                         case 2:
  41                                 info->vrm_version[i] = vr13;
  42                                 break;
  43                         default:
  44                                 return -ENODEV;
  45                         }
  46                 }
  47         }
  48
  49         return 0;
  50 }
  51
  52 static struct pmbus_driver_info pxe1610_info = {
  53         .pages = PXE1610_NUM_PAGES,
  54         .format[PSC_VOLTAGE_IN] = linear,
  55         .format[PSC_VOLTAGE_OUT] = vid,
  56         .format[PSC_CURRENT_IN] = linear,
  57         .format[PSC_CURRENT_OUT] = linear,
  58         .format[PSC_TEMPERATURE] = linear,
  59         .format[PSC_POWER] = linear,
  60         .func[0] = PMBUS_HAVE_VIN
  61                 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
  62                 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
  63                 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
  64                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
  65                 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
  66         .func[1] = PMBUS_HAVE_VIN
  67                 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
  68                 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
  69                 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
  70                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
  71                 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
  72         .func[2] = PMBUS_HAVE_VIN
  73                 | PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
  74                 | PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
  75                 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
  76                 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
  77                 | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
  78         .identify = pxe1610_identify,
  79 };
  80
  81 static int pxe1610_probe(struct i2c_client *client,
  82                           const struct i2c_device_id *id)
  83 {
  84         struct pmbus_driver_info *info;
  85         u8 buf[I2C_SMBUS_BLOCK_MAX];
  86         int ret;
  87
  88         if (!i2c_check_functionality(
  89                         client->adapter,
  90                         I2C_FUNC_SMBUS_READ_BYTE_DATA
  91                         | I2C_FUNC_SMBUS_READ_WORD_DATA
  92                         | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
  93                 return -ENODEV;
  94
  95         /*
  96          * By default this device doesn't boot to page 0, so set page 0
  97          * to access all pmbus registers.
  98          */
  99         i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
 100
 101         /* Read Manufacturer id */
 102         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
 103         if (ret < 0) {
 104                 dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
 105                 return ret;
 106         }
 107         if (ret != 2 || strncmp(buf, "XP", 2)) {
 108                 dev_err(&client->dev, "MFR_ID unrecognized\n");
 109                 return -ENODEV;
 110         }
 111
 112         info = devm_kmemdup(&client->dev, &pxe1610_info,
 113                             sizeof(struct pmbus_driver_info),
 114                             GFP_KERNEL);
 115         if (!info)
 116                 return -ENOMEM;
 117
 118         return pmbus_do_probe(client, id, info);
 119 }
 120
 121 static const struct i2c_device_id pxe1610_id[] = {
 122         {"pxe1610", 0},
 123         {"pxe1110", 0},
 124         {"pxm1310", 0},
 125         {}
 126 };
 127
 128 MODULE_DEVICE_TABLE(i2c, pxe1610_id);
 129
 130 static struct i2c_driver pxe1610_driver = {
 131         .driver = {
 132                         .name = "pxe1610",
 133                         },
 134         .probe = pxe1610_probe,
 135         .remove = pmbus_do_remove,
 136         .id_table = pxe1610_id,
 137 };
 138
 139 module_i2c_driver(pxe1610_driver);
 140
 141 MODULE_AUTHOR("Vijay Khemka <vijaykhemka@fb.com>");
 142 MODULE_DESCRIPTION("PMBus driver for Infineon PXE1610, PXE1110 and PXM1310");
 143 MODULE_LICENSE("GPL");