drivers/acpi/dptf/dptf_power.c

   1 /*
   2  * dptf_power:  DPTF platform power driver
   3  * Copyright (c) 2016, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/acpi.h>
  19 #include <linux/platform_device.h>
  20
  21 /*
  22  * Presentation of attributes which are defined for INT3407. They are:
  23  * PMAX : Maximum platform powe
  24  * PSRC : Platform power source
  25  * ARTG : Adapter rating
  26  * CTYP : Charger type
  27  * PBSS : Battery steady power
  28  */
  29 #define DPTF_POWER_SHOW(name, object) \
  30 static ssize_t name##_show(struct device *dev,\
  31                            struct device_attribute *attr,\
  32                            char *buf)\
  33 {\
  34         struct platform_device *pdev = to_platform_device(dev);\
  35         struct acpi_device *acpi_dev = platform_get_drvdata(pdev);\
  36         unsigned long long val;\
  37         acpi_status status;\
  38 \
  39         status = acpi_evaluate_integer(acpi_dev->handle, #object,\
  40                                        NULL, &val);\
  41         if (ACPI_SUCCESS(status))\
  42                 return sprintf(buf, "%d\n", (int)val);\
  43         else \
  44                 return -EINVAL;\
  45 }
  46
  47 DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
  48 DPTF_POWER_SHOW(platform_power_source, PSRC)
  49 DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
  50 DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
  51 DPTF_POWER_SHOW(charger_type, CTYP)
  52
  53 static DEVICE_ATTR_RO(max_platform_power_mw);
  54 static DEVICE_ATTR_RO(platform_power_source);
  55 static DEVICE_ATTR_RO(adapter_rating_mw);
  56 static DEVICE_ATTR_RO(battery_steady_power_mw);
  57 static DEVICE_ATTR_RO(charger_type);
  58
  59 static struct attribute *dptf_power_attrs[] = {
  60         &dev_attr_max_platform_power_mw.attr,
  61         &dev_attr_platform_power_source.attr,
  62         &dev_attr_adapter_rating_mw.attr,
  63         &dev_attr_battery_steady_power_mw.attr,
  64         &dev_attr_charger_type.attr,
  65         NULL
  66 };
  67
  68 static const struct attribute_group dptf_power_attribute_group = {
  69         .attrs = dptf_power_attrs,
  70         .name = "dptf_power"
  71 };
  72
  73 static int dptf_power_add(struct platform_device *pdev)
  74 {
  75         struct acpi_device *acpi_dev;
  76         acpi_status status;
  77         unsigned long long ptype;
  78         int result;
  79
  80         acpi_dev = ACPI_COMPANION(&(pdev->dev));
  81         if (!acpi_dev)
  82                 return -ENODEV;
  83
  84         status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
  85         if (ACPI_FAILURE(status))
  86                 return -ENODEV;
  87
  88         if (ptype != 0x11)
  89                 return -ENODEV;
  90
  91         result = sysfs_create_group(&pdev->dev.kobj,
  92                                     &dptf_power_attribute_group);
  93         if (result)
  94                 return result;
  95
  96         platform_set_drvdata(pdev, acpi_dev);
  97
  98         return 0;
  99 }
 100
 101 static int dptf_power_remove(struct platform_device *pdev)
 102 {
 103
 104         sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
 105
 106         return 0;
 107 }
 108
 109 static const struct acpi_device_id int3407_device_ids[] = {
 110         {"INT3407", 0},
 111         {"", 0},
 112 };
 113 MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
 114
 115 static struct platform_driver dptf_power_driver = {
 116         .probe = dptf_power_add,
 117         .remove = dptf_power_remove,
 118         .driver = {
 119                 .name = "DPTF Platform Power",
 120                 .acpi_match_table = int3407_device_ids,
 121         },
 122 };
 123
 124 module_platform_driver(dptf_power_driver);
 125
 126 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 127 MODULE_LICENSE("GPL v2");
 128 MODULE_DESCRIPTION("ACPI DPTF platform power driver");