tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * HP Compaq TC1100 Tablet WMI Extras Driver
3 *
4 * Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
5 * Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/types.h>
32#include <acpi/acpi.h>
33#include <acpi/actypes.h>
34#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36#include <linux/platform_device.h>
37
38#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
39
40#define TC1100_INSTANCE_WIRELESS 1
41#define TC1100_INSTANCE_JOGDIAL 2
42
43#define TC1100_LOGPREFIX "tc1100-wmi: "
44#define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
45
46MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
47MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
48MODULE_LICENSE("GPL");
49MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
50
51static int tc1100_probe(struct platform_device *device);
52static int tc1100_remove(struct platform_device *device);
53static int tc1100_suspend(struct platform_device *device, pm_message_t state);
54static int tc1100_resume(struct platform_device *device);
55
56static struct platform_driver tc1100_driver = {
57 .driver = {
58 .name = "tc1100-wmi",
59 .owner = THIS_MODULE,
60 },
61 .probe = tc1100_probe,
62 .remove = tc1100_remove,
63 .suspend = tc1100_suspend,
64 .resume = tc1100_resume,
65};
66
67static struct platform_device *tc1100_device;
68
69struct tc1100_data {
70 u32 wireless;
71 u32 jogdial;
72};
73
74static struct tc1100_data suspend_data;
75
76/* --------------------------------------------------------------------------
77 Device Management
78 -------------------------------------------------------------------------- */
79
80static int get_state(u32 *out, u8 instance)
81{
82 u32 tmp;
83 acpi_status status;
84 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
85 union acpi_object *obj;
86
87 if (!out)
88 return -EINVAL;
89
90 if (instance > 2)
91 return -ENODEV;
92
93 status = wmi_query_block(GUID, instance, &result);
94 if (ACPI_FAILURE(status))
95 return -ENODEV;
96
97 obj = (union acpi_object *) result.pointer;
98 if (obj && obj->type == ACPI_TYPE_BUFFER &&
99 obj->buffer.length == sizeof(u32)) {
100 tmp = *((u32 *) obj->buffer.pointer);
101 } else {
102 tmp = 0;
103 }
104
105 if (result.length > 0 && result.pointer)
106 kfree(result.pointer);
107
108 switch (instance) {
109 case TC1100_INSTANCE_WIRELESS:
110 *out = (tmp == 3) ? 1 : 0;
111 return 0;
112 case TC1100_INSTANCE_JOGDIAL:
113 *out = (tmp == 1) ? 1 : 0;
114 return 0;
115 default:
116 return -ENODEV;
117 }
118}
119
120static int set_state(u32 *in, u8 instance)
121{
122 u32 value;
123 acpi_status status;
124 struct acpi_buffer input;
125
126 if (!in)
127 return -EINVAL;
128
129 if (instance > 2)
130 return -ENODEV;
131
132 switch (instance) {
133 case TC1100_INSTANCE_WIRELESS:
134 value = (*in) ? 1 : 2;
135 break;
136 case TC1100_INSTANCE_JOGDIAL:
137 value = (*in) ? 0 : 1;
138 break;
139 default:
140 return -ENODEV;
141 }
142
143 input.length = sizeof(u32);
144 input.pointer = &value;
145
146 status = wmi_set_block(GUID, instance, &input);
147 if (ACPI_FAILURE(status))
148 return -ENODEV;
149
150 return 0;
151}
152
153/* --------------------------------------------------------------------------
154 FS Interface (/sys)
155 -------------------------------------------------------------------------- */
156
157/*
158 * Read/ write bool sysfs macro
159 */
160#define show_set_bool(value, instance) \
161static ssize_t \
162show_bool_##value(struct device *dev, struct device_attribute *attr, \
163 char *buf) \
164{ \
165 u32 result; \
166 acpi_status status = get_state(&result, instance); \
167 if (ACPI_SUCCESS(status)) \
168 return sprintf(buf, "%d\n", result); \
169 return sprintf(buf, "Read error\n"); \
170} \
171\
172static ssize_t \
173set_bool_##value(struct device *dev, struct device_attribute *attr, \
174 const char *buf, size_t count) \
175{ \
176 u32 tmp = simple_strtoul(buf, NULL, 10); \
177 acpi_status status = set_state(&tmp, instance); \
178 if (ACPI_FAILURE(status)) \
179 return -EINVAL; \
180 return count; \
181} \
182static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
183 show_bool_##value, set_bool_##value);
184
185show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
186show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
187
188static void remove_fs(void)
189{
190 device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
191 device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
192}
193
194static int add_fs(void)
195{
196 int ret;
197
198 ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
199 if (ret)
200 goto add_sysfs_error;
201
202 ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
203 if (ret)
204 goto add_sysfs_error;
205
206 return ret;
207
208add_sysfs_error:
209 remove_fs();
210 return ret;
211}
212
213/* --------------------------------------------------------------------------
214 Driver Model
215 -------------------------------------------------------------------------- */
216
217static int tc1100_probe(struct platform_device *device)
218{
219 int result = 0;
220
221 result = add_fs();
222 return result;
223}
224
225
226static int tc1100_remove(struct platform_device *device)
227{
228 remove_fs();
229 return 0;
230}
231
232static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
233{
234 int ret;
235
236 ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
237 if (ret)
238 return ret;
239
240 ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
241 if (ret)
242 return ret;
243
244 return ret;
245}
246
247static int tc1100_resume(struct platform_device *dev)
248{
249 int ret;
250
251 ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
252 if (ret)
253 return ret;
254
255 ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
256 if (ret)
257 return ret;
258
259 return ret;
260}
261
262static int __init tc1100_init(void)
263{
264 int result = 0;
265
266 if (!wmi_has_guid(GUID))
267 return -ENODEV;
268
269 result = platform_driver_register(&tc1100_driver);
270 if (result)
271 return result;
272
273 tc1100_device = platform_device_alloc("tc1100-wmi", -1);
274 platform_device_add(tc1100_device);
275
276 printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
277
278 return result;
279}
280
281static void __exit tc1100_exit(void)
282{
283 platform_device_del(tc1100_device);
284 platform_driver_unregister(&tc1100_driver);
285
286 printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
287}
288
289module_init(tc1100_init);
290module_exit(tc1100_exit);