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 because some devices report communication error
  21  * (invalid command) for VOUT_MODE command (0x20) although the correct
  22  * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear
  23  * mode.
  24  * This affects both pfe3000 and pfe1100.
  25  */
  26 static struct pmbus_platform_data pfe_plat_data = {
  27         .flags = PMBUS_SKIP_STATUS_CHECK,
  28 };
  29
  30 static struct pmbus_driver_info pfe_driver_info[] = {
  31         [pfe1100] = {
  32                 .pages = 1,
  33                 .format[PSC_VOLTAGE_IN] = linear,
  34                 .format[PSC_VOLTAGE_OUT] = linear,
  35                 .format[PSC_CURRENT_IN] = linear,
  36                 .format[PSC_CURRENT_OUT] = linear,
  37                 .format[PSC_POWER] = linear,
  38                 .format[PSC_TEMPERATURE] = linear,
  39                 .format[PSC_FAN] = linear,
  40
  41                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  42                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  43                            PMBUS_HAVE_POUT |
  44                            PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
  45                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  46                            PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
  47                            PMBUS_HAVE_STATUS_TEMP |
  48                            PMBUS_HAVE_FAN12,
  49         },
  50
  51         [pfe3000] = {
  52                 .pages = 7,
  53                 .format[PSC_VOLTAGE_IN] = linear,
  54                 .format[PSC_VOLTAGE_OUT] = linear,
  55                 .format[PSC_CURRENT_IN] = linear,
  56                 .format[PSC_CURRENT_OUT] = linear,
  57                 .format[PSC_POWER] = linear,
  58                 .format[PSC_TEMPERATURE] = linear,
  59                 .format[PSC_FAN] = linear,
  60
  61                 /* Page 0: V1. */
  62                 .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  63                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  64                            PMBUS_HAVE_POUT | PMBUS_HAVE_FAN12 |
  65                            PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
  66                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  67                            PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
  68                            PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_TEMP |
  69                            PMBUS_HAVE_VCAP,
  70
  71                 /* Page 1: Vsb. */
  72                 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  73                            PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  74                            PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  75                            PMBUS_HAVE_POUT,
  76
  77                 /*
  78                  * Page 2: V1 Ishare.
  79                  * Page 3: Reserved.
  80                  * Page 4: V1 Cathode.
  81                  * Page 5: Vsb Cathode.
  82                  * Page 6: V1 Sense.
  83                  */
  84                 .func[2] = PMBUS_HAVE_VOUT,
  85                 .func[4] = PMBUS_HAVE_VOUT,
  86                 .func[5] = PMBUS_HAVE_VOUT,
  87                 .func[6] = PMBUS_HAVE_VOUT,
  88         },
  89 };
  90
  91 static const struct i2c_device_id pfe_device_id[];
  92
  93 static int pfe_pmbus_probe(struct i2c_client *client)
  94 {
  95         int model;
  96
  97         model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
  98         client->dev.platform_data = &pfe_plat_data;
  99
 100         /*
 101          * PFE3000-12-069RA devices may not stay in page 0 during device
 102          * probe which leads to probe failure (read status word failed).
 103          * So let's set the device to page 0 at the beginning.
 104          */
 105         if (model == pfe3000)
 106                 i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
 107
 108         return pmbus_do_probe(client, &pfe_driver_info[model]);
 109 }
 110
 111 static const struct i2c_device_id pfe_device_id[] = {
 112         {"pfe1100", pfe1100},
 113         {"pfe3000", pfe3000},
 114         {}
 115 };
 116
 117 MODULE_DEVICE_TABLE(i2c, pfe_device_id);
 118
 119 static struct i2c_driver pfe_pmbus_driver = {
 120         .driver = {
 121                    .name = "bel-pfe",
 122         },
 123         .probe = pfe_pmbus_probe,
 124         .id_table = pfe_device_id,
 125 };
 126
 127 module_i2c_driver(pfe_pmbus_driver);
 128
 129 MODULE_AUTHOR("Tao Ren <rentao.bupt@gmail.com>");
 130 MODULE_DESCRIPTION("PMBus driver for BEL PFE Family Power Supplies");
 131 MODULE_LICENSE("GPL");
 132 MODULE_IMPORT_NS("PMBUS");