kernel/drivers/platform/x86/intel-rst.c

   1 /*
   2  *  Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/acpi.h>
  24
  25 MODULE_LICENSE("GPL");
  26
  27 static ssize_t irst_show_wakeup_events(struct device *dev,
  28                                        struct device_attribute *attr,
  29                                        char *buf)
  30 {
  31         struct acpi_device *acpi;
  32         unsigned long long value;
  33         acpi_status status;
  34
  35         acpi = to_acpi_device(dev);
  36
  37         status = acpi_evaluate_integer(acpi->handle, "GFFS", NULL, &value);
  38         if (ACPI_FAILURE(status))
  39                 return -EINVAL;
  40
  41         return sprintf(buf, "%lld\n", value);
  42 }
  43
  44 static ssize_t irst_store_wakeup_events(struct device *dev,
  45                                         struct device_attribute *attr,
  46                                         const char *buf, size_t count)
  47 {
  48         struct acpi_device *acpi;
  49         acpi_status status;
  50         unsigned long value;
  51         int error;
  52
  53         acpi = to_acpi_device(dev);
  54
  55         error = kstrtoul(buf, 0, &value);
  56
  57         if (error)
  58                 return error;
  59
  60         status = acpi_execute_simple_method(acpi->handle, "SFFS", value);
  61
  62         if (ACPI_FAILURE(status))
  63                 return -EINVAL;
  64
  65         return count;
  66 }
  67
  68 static struct device_attribute irst_wakeup_attr = {
  69         .attr = { .name = "wakeup_events", .mode = 0600 },
  70         .show = irst_show_wakeup_events,
  71         .store = irst_store_wakeup_events
  72 };
  73
  74 static ssize_t irst_show_wakeup_time(struct device *dev,
  75                                      struct device_attribute *attr, char *buf)
  76 {
  77         struct acpi_device *acpi;
  78         unsigned long long value;
  79         acpi_status status;
  80
  81         acpi = to_acpi_device(dev);
  82
  83         status = acpi_evaluate_integer(acpi->handle, "GFTV", NULL, &value);
  84         if (ACPI_FAILURE(status))
  85                 return -EINVAL;
  86
  87         return sprintf(buf, "%lld\n", value);
  88 }
  89
  90 static ssize_t irst_store_wakeup_time(struct device *dev,
  91                                       struct device_attribute *attr,
  92                                       const char *buf, size_t count)
  93 {
  94         struct acpi_device *acpi;
  95         acpi_status status;
  96         unsigned long value;
  97         int error;
  98
  99         acpi = to_acpi_device(dev);
 100
 101         error = kstrtoul(buf, 0, &value);
 102
 103         if (error)
 104                 return error;
 105
 106         status = acpi_execute_simple_method(acpi->handle, "SFTV", value);
 107
 108         if (ACPI_FAILURE(status))
 109                 return -EINVAL;
 110
 111         return count;
 112 }
 113
 114 static struct device_attribute irst_timeout_attr = {
 115         .attr = { .name = "wakeup_time", .mode = 0600 },
 116         .show = irst_show_wakeup_time,
 117         .store = irst_store_wakeup_time
 118 };
 119
 120 static int irst_add(struct acpi_device *acpi)
 121 {
 122         int error;
 123
 124         error = device_create_file(&acpi->dev, &irst_timeout_attr);
 125         if (unlikely(error))
 126                 return error;
 127
 128         error = device_create_file(&acpi->dev, &irst_wakeup_attr);
 129         if (unlikely(error))
 130                 device_remove_file(&acpi->dev, &irst_timeout_attr);
 131
 132         return error;
 133 }
 134
 135 static int irst_remove(struct acpi_device *acpi)
 136 {
 137         device_remove_file(&acpi->dev, &irst_wakeup_attr);
 138         device_remove_file(&acpi->dev, &irst_timeout_attr);
 139
 140         return 0;
 141 }
 142
 143 static const struct acpi_device_id irst_ids[] = {
 144         {"INT3392", 0},
 145         {"", 0}
 146 };
 147
 148 static struct acpi_driver irst_driver = {
 149         .owner = THIS_MODULE,
 150         .name = "intel_rapid_start",
 151         .class = "intel_rapid_start",
 152         .ids = irst_ids,
 153         .ops = {
 154                 .add = irst_add,
 155                 .remove = irst_remove,
 156         },
 157 };
 158
 159 module_acpi_driver(irst_driver);
 160
 161 MODULE_DEVICE_TABLE(acpi, irst_ids);