drivers/platform/x86/intel-rst.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
   4  */
   5
   6 #include <linux/acpi.h>
   7 #include <linux/module.h>
   8 #include <linux/slab.h>
   9
  10 MODULE_LICENSE("GPL");
  11
  12 static ssize_t irst_show_wakeup_events(struct device *dev,
  13                                        struct device_attribute *attr,
  14                                        char *buf)
  15 {
  16         struct acpi_device *acpi;
  17         unsigned long long value;
  18         acpi_status status;
  19
  20         acpi = to_acpi_device(dev);
  21
  22         status = acpi_evaluate_integer(acpi->handle, "GFFS", NULL, &value);
  23         if (ACPI_FAILURE(status))
  24                 return -EINVAL;
  25
  26         return sprintf(buf, "%lld\n", value);
  27 }
  28
  29 static ssize_t irst_store_wakeup_events(struct device *dev,
  30                                         struct device_attribute *attr,
  31                                         const char *buf, size_t count)
  32 {
  33         struct acpi_device *acpi;
  34         acpi_status status;
  35         unsigned long value;
  36         int error;
  37
  38         acpi = to_acpi_device(dev);
  39
  40         error = kstrtoul(buf, 0, &value);
  41         if (error)
  42                 return error;
  43
  44         status = acpi_execute_simple_method(acpi->handle, "SFFS", value);
  45         if (ACPI_FAILURE(status))
  46                 return -EINVAL;
  47
  48         return count;
  49 }
  50
  51 static struct device_attribute irst_wakeup_attr = {
  52         .attr = { .name = "wakeup_events", .mode = 0600 },
  53         .show = irst_show_wakeup_events,
  54         .store = irst_store_wakeup_events
  55 };
  56
  57 static ssize_t irst_show_wakeup_time(struct device *dev,
  58                                      struct device_attribute *attr, char *buf)
  59 {
  60         struct acpi_device *acpi;
  61         unsigned long long value;
  62         acpi_status status;
  63
  64         acpi = to_acpi_device(dev);
  65
  66         status = acpi_evaluate_integer(acpi->handle, "GFTV", NULL, &value);
  67         if (ACPI_FAILURE(status))
  68                 return -EINVAL;
  69
  70         return sprintf(buf, "%lld\n", value);
  71 }
  72
  73 static ssize_t irst_store_wakeup_time(struct device *dev,
  74                                       struct device_attribute *attr,
  75                                       const char *buf, size_t count)
  76 {
  77         struct acpi_device *acpi;
  78         acpi_status status;
  79         unsigned long value;
  80         int error;
  81
  82         acpi = to_acpi_device(dev);
  83
  84         error = kstrtoul(buf, 0, &value);
  85         if (error)
  86                 return error;
  87
  88         status = acpi_execute_simple_method(acpi->handle, "SFTV", value);
  89         if (ACPI_FAILURE(status))
  90                 return -EINVAL;
  91
  92         return count;
  93 }
  94
  95 static struct device_attribute irst_timeout_attr = {
  96         .attr = { .name = "wakeup_time", .mode = 0600 },
  97         .show = irst_show_wakeup_time,
  98         .store = irst_store_wakeup_time
  99 };
 100
 101 static int irst_add(struct acpi_device *acpi)
 102 {
 103         int error;
 104
 105         error = device_create_file(&acpi->dev, &irst_timeout_attr);
 106         if (unlikely(error))
 107                 return error;
 108
 109         error = device_create_file(&acpi->dev, &irst_wakeup_attr);
 110         if (unlikely(error))
 111                 device_remove_file(&acpi->dev, &irst_timeout_attr);
 112
 113         return error;
 114 }
 115
 116 static int irst_remove(struct acpi_device *acpi)
 117 {
 118         device_remove_file(&acpi->dev, &irst_wakeup_attr);
 119         device_remove_file(&acpi->dev, &irst_timeout_attr);
 120
 121         return 0;
 122 }
 123
 124 static const struct acpi_device_id irst_ids[] = {
 125         {"INT3392", 0},
 126         {"", 0}
 127 };
 128
 129 static struct acpi_driver irst_driver = {
 130         .owner = THIS_MODULE,
 131         .name = "intel_rapid_start",
 132         .class = "intel_rapid_start",
 133         .ids = irst_ids,
 134         .ops = {
 135                 .add = irst_add,
 136                 .remove = irst_remove,
 137         },
 138 };
 139
 140 module_acpi_driver(irst_driver);
 141
 142 MODULE_DEVICE_TABLE(acpi, irst_ids);