drivers/hwmon/pmbus/mp5920.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for MP5920 and compatible chips.
   4  */
   5
   6 #include <linux/i2c.h>
   7 #include <linux/minmax.h>
   8 #include <linux/module.h>
   9 #include <linux/of_device.h>
  10 #include "pmbus.h"
  11
  12 static struct pmbus_driver_info mp5920_info = {
  13         .pages = 1,
  14         .format[PSC_VOLTAGE_IN] = direct,
  15         .format[PSC_VOLTAGE_OUT] = direct,
  16         .format[PSC_CURRENT_OUT] = direct,
  17         .format[PSC_POWER] = direct,
  18         .format[PSC_TEMPERATURE] = direct,
  19         .m[PSC_VOLTAGE_IN] = 2266,
  20         .b[PSC_VOLTAGE_IN] = 0,
  21         .R[PSC_VOLTAGE_IN] = -1,
  22         .m[PSC_VOLTAGE_OUT] = 2266,
  23         .b[PSC_VOLTAGE_OUT] = 0,
  24         .R[PSC_VOLTAGE_OUT] = -1,
  25         .m[PSC_CURRENT_OUT] = 546,
  26         .b[PSC_CURRENT_OUT] = 0,
  27         .R[PSC_CURRENT_OUT] = -2,
  28         .m[PSC_POWER] = 5840,
  29         .b[PSC_POWER] = 0,
  30         .R[PSC_POWER] = -3,
  31         .m[PSC_TEMPERATURE] = 1067,
  32         .b[PSC_TEMPERATURE] = 20500,
  33         .R[PSC_TEMPERATURE] = -2,
  34         .func[0] = PMBUS_HAVE_VIN  | PMBUS_HAVE_VOUT |
  35                 PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
  36                 PMBUS_HAVE_TEMP,
  37 };
  38
  39 static int mp5920_probe(struct i2c_client *client)
  40 {
  41         struct device *dev =  &client->dev;
  42         int ret;
  43         u8 buf[I2C_SMBUS_BLOCK_MAX];
  44
  45         if (!i2c_check_functionality(client->adapter,
  46                                      I2C_FUNC_SMBUS_READ_WORD_DATA))
  47                 return -ENODEV;
  48
  49         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
  50         if (ret < 0)
  51                 return dev_err_probe(dev, ret, "Failed to read PMBUS_MFR_MODEL\n");
  52
  53         if (ret != 6 || strncmp(buf, "MP5920", 6)) {
  54                 return dev_err_probe(dev, -ENODEV, "Model '%.*s' not supported\n",
  55                                      min_t(int, ret, sizeof(buf)), buf);
  56         }
  57
  58         return pmbus_do_probe(client, &mp5920_info);
  59 }
  60
  61 static const struct of_device_id mp5920_of_match[] = {
  62         { .compatible = "mps,mp5920" },
  63         { }
  64 };
  65
  66 MODULE_DEVICE_TABLE(of, mp5920_of_match);
  67
  68 static const struct i2c_device_id mp5920_id[] = {
  69         { "mp5920" },
  70         { }
  71 };
  72
  73 MODULE_DEVICE_TABLE(i2c, mp5920_id);
  74
  75 static struct i2c_driver mp5920_driver = {
  76         .driver = {
  77                 .name = "mp5920",
  78                 .of_match_table = mp5920_of_match,
  79         },
  80         .probe = mp5920_probe,
  81         .id_table = mp5920_id,
  82 };
  83
  84 module_i2c_driver(mp5920_driver);
  85
  86 MODULE_AUTHOR("Tony Ao <[email protected]>");
  87 MODULE_AUTHOR("Alex Vdovydchenko <[email protected]>");
  88 MODULE_DESCRIPTION("PMBus driver for MP5920 HSC");
  89 MODULE_LICENSE("GPL");
  90 MODULE_IMPORT_NS("PMBUS");