drivers/hwmon/pmbus/crps.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2024 IBM Corp.
   4  */
   5
   6 #include <linux/i2c.h>
   7 #include <linux/of.h>
   8 #include <linux/pmbus.h>
   9
  10 #include "pmbus.h"
  11
  12 static const struct i2c_device_id crps_id[] = {
  13         { "intel_crps185" },
  14         {}
  15 };
  16 MODULE_DEVICE_TABLE(i2c, crps_id);
  17
  18 static struct pmbus_driver_info crps_info = {
  19         .pages = 1,
  20         /* PSU uses default linear data format. */
  21         .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT |
  22                 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_IIN |
  23                 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
  24                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
  25                 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
  26                 PMBUS_HAVE_STATUS_TEMP |
  27                 PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12,
  28 };
  29
  30 static int crps_probe(struct i2c_client *client)
  31 {
  32         int rc;
  33         struct device *dev = &client->dev;
  34         char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
  35
  36         rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
  37         if (rc < 0)
  38                 return dev_err_probe(dev, rc, "Failed to read PMBUS_MFR_MODEL\n");
  39
  40         if (rc != 7 || strncmp(buf, "03NK260", 7)) {
  41                 buf[rc] = '\0';
  42                 return dev_err_probe(dev, -ENODEV, "Model '%s' not supported\n", buf);
  43         }
  44
  45         rc = pmbus_do_probe(client, &crps_info);
  46         if (rc)
  47                 return dev_err_probe(dev, rc, "Failed to probe\n");
  48
  49         return 0;
  50 }
  51
  52 static const struct of_device_id crps_of_match[] = {
  53         {
  54                 .compatible = "intel,crps185",
  55         },
  56         {}
  57 };
  58 MODULE_DEVICE_TABLE(of, crps_of_match);
  59
  60 static struct i2c_driver crps_driver = {
  61         .driver = {
  62                 .name = "crps",
  63                 .of_match_table = crps_of_match,
  64         },
  65         .probe = crps_probe,
  66         .id_table = crps_id,
  67 };
  68
  69 module_i2c_driver(crps_driver);
  70
  71 MODULE_AUTHOR("Ninad Palsule");
  72 MODULE_DESCRIPTION("PMBus driver for Intel Common Redundant power supplies");
  73 MODULE_LICENSE("GPL");
  74 MODULE_IMPORT_NS("PMBUS");