drivers/hwmon/pmbus/mpq8785.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for MPS MPQ8785 Step-Down Converter
   4  */
   5
   6 #include <linux/i2c.h>
   7 #include <linux/module.h>
   8 #include <linux/of_device.h>
   9 #include "pmbus.h"
  10
  11 static int mpq8785_identify(struct i2c_client *client,
  12                             struct pmbus_driver_info *info)
  13 {
  14         int vout_mode;
  15
  16         vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
  17         if (vout_mode < 0 || vout_mode == 0xff)
  18                 return vout_mode < 0 ? vout_mode : -ENODEV;
  19         switch (vout_mode >> 5) {
  20         case 0:
  21                 info->format[PSC_VOLTAGE_OUT] = linear;
  22                 break;
  23         case 1:
  24         case 2:
  25                 info->format[PSC_VOLTAGE_OUT] = direct;
  26                 info->m[PSC_VOLTAGE_OUT] = 64;
  27                 info->b[PSC_VOLTAGE_OUT] = 0;
  28                 info->R[PSC_VOLTAGE_OUT] = 1;
  29                 break;
  30         default:
  31                 return -ENODEV;
  32         }
  33
  34         return 0;
  35 };
  36
  37 static struct pmbus_driver_info mpq8785_info = {
  38         .pages = 1,
  39         .format[PSC_VOLTAGE_IN] = direct,
  40         .format[PSC_CURRENT_OUT] = direct,
  41         .format[PSC_TEMPERATURE] = direct,
  42         .m[PSC_VOLTAGE_IN] = 4,
  43         .b[PSC_VOLTAGE_IN] = 0,
  44         .R[PSC_VOLTAGE_IN] = 1,
  45         .m[PSC_CURRENT_OUT] = 16,
  46         .b[PSC_CURRENT_OUT] = 0,
  47         .R[PSC_CURRENT_OUT] = 0,
  48         .m[PSC_TEMPERATURE] = 1,
  49         .b[PSC_TEMPERATURE] = 0,
  50         .R[PSC_TEMPERATURE] = 0,
  51         .func[0] =
  52                 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
  53                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  54                 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  55                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
  56         .identify = mpq8785_identify,
  57 };
  58
  59 static int mpq8785_probe(struct i2c_client *client)
  60 {
  61         return pmbus_do_probe(client, &mpq8785_info);
  62 };
  63
  64 static const struct i2c_device_id mpq8785_id[] = {
  65         { "mpq8785" },
  66         { },
  67 };
  68 MODULE_DEVICE_TABLE(i2c, mpq8785_id);
  69
  70 static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
  71         { .compatible = "mps,mpq8785" },
  72         {}
  73 };
  74 MODULE_DEVICE_TABLE(of, mpq8785_of_match);
  75
  76 static struct i2c_driver mpq8785_driver = {
  77         .driver = {
  78                    .name = "mpq8785",
  79                    .of_match_table = of_match_ptr(mpq8785_of_match),
  80         },
  81         .probe = mpq8785_probe,
  82         .id_table = mpq8785_id,
  83 };
  84
  85 module_i2c_driver(mpq8785_driver);
  86
  87 MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>");
  88 MODULE_DESCRIPTION("PMBus driver for MPS MPQ8785");
  89 MODULE_LICENSE("GPL");
  90 MODULE_IMPORT_NS("PMBUS");