drivers/hwmon/pmbus/bel-pfe.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Hardware monitoring driver for BEL PFE family power supplies.
   4  *
   5  * Copyright (c) 2019 Facebook Inc.
   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 <linux/pmbus.h>
  14
  15 #include "pmbus.h"
  16
  17 enum chips {pfe1100, pfe3000};
  18
  19 /*
  20  * Disable status check for pfe3000 devices, because some devices report
  21  * communication error (invalid command) for VOUT_MODE command (0x20)
  22  * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
  23  * exponent in linear mode.
  24  */
  25 static struct pmbus_platform_data pfe3000_plat_data = {
  26         .flags = PMBUS_SKIP_STATUS_CHECK,
  27 };
  28
  29 static struct pmbus_driver_info pfe_driver_info[] = {
  30         [pfe1100] = {
  31                 .pages = 1,
  32                 .format[PSC_VOLTAGE_IN] = linear,
  33                 .format[PSC_VOLTAGE_OUT] = linear,
  34                 .format[PSC_CURRENT_IN] = linear,
  35                 .format[PSC_CURRENT_OUT] = linear,
  36                 .format[PSC_POWER] = linear,
  37                 .format[PSC_TEMPERATURE] = linear,
  38                 .format[PSC_FAN] = linear,
  39
  40                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  41                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  42                            PMBUS_HAVE_POUT |
  43                            PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
  44                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  45                            PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
  46                            PMBUS_HAVE_STATUS_TEMP |
  47                            PMBUS_HAVE_FAN12,
  48         },
  49
  50         [pfe3000] = {
  51                 .pages = 7,
  52                 .format[PSC_VOLTAGE_IN] = linear,
  53                 .format[PSC_VOLTAGE_OUT] = linear,
  54                 .format[PSC_CURRENT_IN] = linear,
  55                 .format[PSC_CURRENT_OUT] = linear,
  56                 .format[PSC_POWER] = linear,
  57                 .format[PSC_TEMPERATURE] = linear,
  58                 .format[PSC_FAN] = linear,
  59
  60                 /* Page 0: V1. */
  61                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  62                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  63                            PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
  64                            PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
  65                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  66                            PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
  67                            PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
  68                            PMBUS_HAVE_VCAP,
  69
  70                 /* Page 1: Vsb. */
  71                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  72                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  73                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  74                            PMBUS_HAVE_POUT,
  75
  76                 /*
  77                  * Page 2: V1 Ishare.
  78                  * Page 3: Reserved.
  79                  * Page 4: V1 Cathode.
  80                  * Page 5: Vsb Cathode.
  81                  * Page 6: V1 Sense.
  82                  */
  83                 .func[2] = PMBUS_HAVE_VOUT,
  84                 .func[4] = PMBUS_HAVE_VOUT,
  85                 .func[5] = PMBUS_HAVE_VOUT,
  86                 .func[6] = PMBUS_HAVE_VOUT,
  87         },
  88 };
  89
  90 static int pfe_pmbus_probe(struct i2c_client *client,
  91                            const struct i2c_device_id *id)
  92 {
  93         int model;
  94
  95         model = (int)id->driver_data;
  96
  97         /*
  98          * PFE3000-12-069RA devices may not stay in page 0 during device
  99          * probe which leads to probe failure (read status word failed).
 100          * So let's set the device to page 0 at the beginning.
 101          */
 102         if (model == pfe3000) {
 103                 client->dev.platform_data = &pfe3000_plat_data;
 104                 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
 105         }
 106
 107         return pmbus_do_probe(client, id, &pfe_driver_info[model]);
 108 }
 109
 110 static const struct i2c_device_id pfe_device_id[] = {
 111         {"pfe1100", pfe1100},
 112         {"pfe3000", pfe3000},
 113         {}
 114 };
 115
 116 MODULE_DEVICE_TABLE(i2c, pfe_device_id);
 117
 118 static struct i2c_driver pfe_pmbus_driver = {
 119         .driver = {
 120                    .name = "bel-pfe",
 121         },
 122         .probe = pfe_pmbus_probe,
 123         .remove = pmbus_do_remove,
 124         .id_table = pfe_device_id,
 125 };
 126
 127 module_i2c_driver(pfe_pmbus_driver);
 128
 129 MODULE_AUTHOR("Tao Ren <[email protected]>");
 130 MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
 131 MODULE_LICENSE("GPL");