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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 
 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);
162 

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