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