LXR linux/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
  25MODULE_LICENSE("GPL");
  26
  27static 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
  44static 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
  68static 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
  74static 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
  90static 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
 114static 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
 120static 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
 135static 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
 143static const struct acpi_device_id irst_ids[] = {
 144        {"INT3392", 0},
 145        {"", 0}
 146};
 147
 148static 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
 159module_acpi_driver(irst_driver);
 160
 161MODULE_DEVICE_TABLE(acpi, irst_ids);
 162