drivers/platform/x86/intel/rst.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright 2013 Matthew Garrett <[email protected]>
   4  */
   5
   6 #include <linux/acpi.h>
   7 #include <linux/module.h>
   8 #include <linux/slab.h>
   9
  10 MODULE_DESCRIPTION("Intel Rapid Start Technology Driver");
  11 MODULE_LICENSE("GPL");
  12
  13 static ssize_t irst_show_wakeup_events(struct device *dev,
  14                                        struct device_attribute *attr,
  15                                        char *buf)
  16 {
  17         struct acpi_device *acpi;
  18         unsigned long long value;
  19         acpi_status status;
  20
  21         acpi = to_acpi_device(dev);
  22
  23         status = acpi_evaluate_integer(acpi->handle, "GFFS", NULL, &value);
  24         if (ACPI_FAILURE(status))
  25                 return -EINVAL;
  26
  27         return sprintf(buf, "%lld\n", value);
  28 }
  29
  30 static ssize_t irst_store_wakeup_events(struct device *dev,
  31                                         struct device_attribute *attr,
  32                                         const char *buf, size_t count)
  33 {
  34         struct acpi_device *acpi;
  35         acpi_status status;
  36         unsigned long value;
  37         int error;
  38
  39         acpi = to_acpi_device(dev);
  40
  41         error = kstrtoul(buf, 0, &value);
  42         if (error)
  43                 return error;
  44
  45         status = acpi_execute_simple_method(acpi->handle, "SFFS", value);
  46         if (ACPI_FAILURE(status))
  47                 return -EINVAL;
  48
  49         return count;
  50 }
  51
  52 static struct device_attribute irst_wakeup_attr = {
  53         .attr = { .name = "wakeup_events", .mode = 0600 },
  54         .show = irst_show_wakeup_events,
  55         .store = irst_store_wakeup_events
  56 };
  57
  58 static ssize_t irst_show_wakeup_time(struct device *dev,
  59                                      struct device_attribute *attr, char *buf)
  60 {
  61         struct acpi_device *acpi;
  62         unsigned long long value;
  63         acpi_status status;
  64
  65         acpi = to_acpi_device(dev);
  66
  67         status = acpi_evaluate_integer(acpi->handle, "GFTV", NULL, &value);
  68         if (ACPI_FAILURE(status))
  69                 return -EINVAL;
  70
  71         return sprintf(buf, "%lld\n", value);
  72 }
  73
  74 static ssize_t irst_store_wakeup_time(struct device *dev,
  75                                       struct device_attribute *attr,
  76                                       const char *buf, size_t count)
  77 {
  78         struct acpi_device *acpi;
  79         acpi_status status;
  80         unsigned long value;
  81         int error;
  82
  83         acpi = to_acpi_device(dev);
  84
  85         error = kstrtoul(buf, 0, &value);
  86         if (error)
  87                 return error;
  88
  89         status = acpi_execute_simple_method(acpi->handle, "SFTV", value);
  90         if (ACPI_FAILURE(status))
  91                 return -EINVAL;
  92
  93         return count;
  94 }
  95
  96 static struct device_attribute irst_timeout_attr = {
  97         .attr = { .name = "wakeup_time", .mode = 0600 },
  98         .show = irst_show_wakeup_time,
  99         .store = irst_store_wakeup_time
 100 };
 101
 102 static int irst_add(struct acpi_device *acpi)
 103 {
 104         int error;
 105
 106         error = device_create_file(&acpi->dev, &irst_timeout_attr);
 107         if (unlikely(error))
 108                 return error;
 109
 110         error = device_create_file(&acpi->dev, &irst_wakeup_attr);
 111         if (unlikely(error))
 112                 device_remove_file(&acpi->dev, &irst_timeout_attr);
 113
 114         return error;
 115 }
 116
 117 static void irst_remove(struct acpi_device *acpi)
 118 {
 119         device_remove_file(&acpi->dev, &irst_wakeup_attr);
 120         device_remove_file(&acpi->dev, &irst_timeout_attr);
 121 }
 122
 123 static const struct acpi_device_id irst_ids[] = {
 124         {"INT3392", 0},
 125         {"", 0}
 126 };
 127
 128 static struct acpi_driver irst_driver = {
 129         .name = "intel_rapid_start",
 130         .class = "intel_rapid_start",
 131         .ids = irst_ids,
 132         .ops = {
 133                 .add = irst_add,
 134                 .remove = irst_remove,
 135         },
 136 };
 137
 138 module_acpi_driver(irst_driver);
 139
 140 MODULE_DEVICE_TABLE(acpi, irst_ids);