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 <acpi/acpi_drivers.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         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  33         union acpi_object *result;
  34         acpi_status status;
  35
  36         acpi = to_acpi_device(dev);
  37
  38         status = acpi_evaluate_object(acpi->handle, "GFFS", NULL, &output);
  39         if (!ACPI_SUCCESS(status))
  40                 return -EINVAL;
  41
  42         result = output.pointer;
  43
  44         if (result->type != ACPI_TYPE_INTEGER) {
  45                 kfree(result);
  46                 return -EINVAL;
  47         }
  48
  49         return sprintf(buf, "%lld\n", result->integer.value);
  50 }
  51
  52 static ssize_t irst_store_wakeup_events(struct device *dev,
  53                                         struct device_attribute *attr,
  54                                         const char *buf, size_t count)
  55 {
  56         struct acpi_device *acpi;
  57         struct acpi_object_list input;
  58         union acpi_object param;
  59         acpi_status status;
  60         unsigned long value;
  61         int error;
  62
  63         acpi = to_acpi_device(dev);
  64
  65         error = kstrtoul(buf, 0, &value);
  66
  67         if (error)
  68                 return error;
  69
  70         param.type = ACPI_TYPE_INTEGER;
  71         param.integer.value = value;
  72
  73         input.count = 1;
  74         input.pointer = &param;
  75
  76         status = acpi_evaluate_object(acpi->handle, "SFFS", &input, NULL);
  77
  78         if (!ACPI_SUCCESS(status))
  79                 return -EINVAL;
  80
  81         return count;
  82 }
  83
  84 static struct device_attribute irst_wakeup_attr = {
  85         .attr = { .name = "wakeup_events", .mode = 0600 },
  86         .show = irst_show_wakeup_events,
  87         .store = irst_store_wakeup_events
  88 };
  89
  90 static ssize_t irst_show_wakeup_time(struct device *dev,
  91                                      struct device_attribute *attr, char *buf)
  92 {
  93         struct acpi_device *acpi;
  94         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  95         union acpi_object *result;
  96         acpi_status status;
  97
  98         acpi = to_acpi_device(dev);
  99
 100         status = acpi_evaluate_object(acpi->handle, "GFTV", NULL, &output);
 101         if (!ACPI_SUCCESS(status))
 102                 return -EINVAL;
 103
 104         result = output.pointer;
 105
 106         if (result->type != ACPI_TYPE_INTEGER) {
 107                 kfree(result);
 108                 return -EINVAL;
 109         }
 110
 111         return sprintf(buf, "%lld\n", result->integer.value);
 112 }
 113
 114 static ssize_t irst_store_wakeup_time(struct device *dev,
 115                                       struct device_attribute *attr,
 116                                       const char *buf, size_t count)
 117 {
 118         struct acpi_device *acpi;
 119         struct acpi_object_list input;
 120         union acpi_object param;
 121         acpi_status status;
 122         unsigned long value;
 123         int error;
 124
 125         acpi = to_acpi_device(dev);
 126
 127         error = kstrtoul(buf, 0, &value);
 128
 129         if (error)
 130                 return error;
 131
 132         param.type = ACPI_TYPE_INTEGER;
 133         param.integer.value = value;
 134
 135         input.count = 1;
 136         input.pointer = &param;
 137
 138         status = acpi_evaluate_object(acpi->handle, "SFTV", &input, NULL);
 139
 140         if (!ACPI_SUCCESS(status))
 141                 return -EINVAL;
 142
 143         return count;
 144 }
 145
 146 static struct device_attribute irst_timeout_attr = {
 147         .attr = { .name = "wakeup_time", .mode = 0600 },
 148         .show = irst_show_wakeup_time,
 149         .store = irst_store_wakeup_time
 150 };
 151
 152 static int irst_add(struct acpi_device *acpi)
 153 {
 154         int error = 0;
 155
 156         error = device_create_file(&acpi->dev, &irst_timeout_attr);
 157         if (error)
 158                 goto out;
 159
 160         error = device_create_file(&acpi->dev, &irst_wakeup_attr);
 161         if (error)
 162                 goto out_timeout;
 163
 164         return 0;
 165
 166 out_timeout:
 167         device_remove_file(&acpi->dev, &irst_timeout_attr);
 168 out:
 169         return error;
 170 }
 171
 172 static int irst_remove(struct acpi_device *acpi)
 173 {
 174         device_remove_file(&acpi->dev, &irst_wakeup_attr);
 175         device_remove_file(&acpi->dev, &irst_timeout_attr);
 176
 177         return 0;
 178 }
 179
 180 static const struct acpi_device_id irst_ids[] = {
 181         {"INT3392", 0},
 182         {"", 0}
 183 };
 184
 185 static struct acpi_driver irst_driver = {
 186         .owner = THIS_MODULE,
 187         .name = "intel_rapid_start",
 188         .class = "intel_rapid_start",
 189         .ids = irst_ids,
 190         .ops = {
 191                 .add = irst_add,
 192                 .remove = irst_remove,
 193         },
 194 };
 195
 196 module_acpi_driver(irst_driver);
 197
 198 MODULE_DEVICE_TABLE(acpi, irst_ids);