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/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
35 #include <linux/platform_device.h>
36
37 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
38
39 #define TC1100_INSTANCE_WIRELESS 1
40 #define TC1100_INSTANCE_JOGDIAL 2
41
42 #define TC1100_LOGPREFIX "tc1100-wmi: "
43 #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
44
45 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
46 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
47 MODULE_LICENSE("GPL");
48 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
49
50 static int tc1100_probe(struct platform_device *device);
51 static int tc1100_remove(struct platform_device *device);
52 static int tc1100_suspend(struct platform_device *device, pm_message_t state);
53 static int tc1100_resume(struct platform_device *device);
54
55 static struct platform_driver tc1100_driver = {
56 .driver = {
57 .name = "tc1100-wmi",
58 .owner = THIS_MODULE,
59 },
60 .probe = tc1100_probe,
61 .remove = tc1100_remove,
62 .suspend = tc1100_suspend,
63 .resume = tc1100_resume,
64 };
65
66 static struct platform_device *tc1100_device;
67
68 struct tc1100_data {
69 u32 wireless;
70 u32 jogdial;
71 };
72
73 static struct tc1100_data suspend_data;
74
75 /* --------------------------------------------------------------------------
76 Device Management
77 -------------------------------------------------------------------------- */
78
get_state(u32 * out,u8 instance)79 static int get_state(u32 *out, u8 instance)
80 {
81 u32 tmp;
82 acpi_status status;
83 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
84 union acpi_object *obj;
85
86 if (!out)
87 return -EINVAL;
88
89 if (instance > 2)
90 return -ENODEV;
91
92 status = wmi_query_block(GUID, instance, &result);
93 if (ACPI_FAILURE(status))
94 return -ENODEV;
95
96 obj = (union acpi_object *) result.pointer;
97 if (obj && obj->type == ACPI_TYPE_BUFFER &&
98 obj->buffer.length == sizeof(u32)) {
99 tmp = *((u32 *) obj->buffer.pointer);
100 } else {
101 tmp = 0;
102 }
103
104 if (result.length > 0 && result.pointer)
105 kfree(result.pointer);
106
107 switch (instance) {
108 case TC1100_INSTANCE_WIRELESS:
109 *out = (tmp == 3) ? 1 : 0;
110 return 0;
111 case TC1100_INSTANCE_JOGDIAL:
112 *out = (tmp == 1) ? 1 : 0;
113 return 0;
114 default:
115 return -ENODEV;
116 }
117 }
118
set_state(u32 * in,u8 instance)119 static int set_state(u32 *in, u8 instance)
120 {
121 u32 value;
122 acpi_status status;
123 struct acpi_buffer input;
124
125 if (!in)
126 return -EINVAL;
127
128 if (instance > 2)
129 return -ENODEV;
130
131 switch (instance) {
132 case TC1100_INSTANCE_WIRELESS:
133 value = (*in) ? 1 : 2;
134 break;
135 case TC1100_INSTANCE_JOGDIAL:
136 value = (*in) ? 0 : 1;
137 break;
138 default:
139 return -ENODEV;
140 }
141
142 input.length = sizeof(u32);
143 input.pointer = &value;
144
145 status = wmi_set_block(GUID, instance, &input);
146 if (ACPI_FAILURE(status))
147 return -ENODEV;
148
149 return 0;
150 }
151
152 /* --------------------------------------------------------------------------
153 FS Interface (/sys)
154 -------------------------------------------------------------------------- */
155
156 /*
157 * Read/ write bool sysfs macro
158 */
159 #define show_set_bool(value, instance) \
160 static ssize_t \
161 show_bool_##value(struct device *dev, struct device_attribute *attr, \
162 char *buf) \
163 { \
164 u32 result; \
165 acpi_status status = get_state(&result, instance); \
166 if (ACPI_SUCCESS(status)) \
167 return sprintf(buf, "%d\n", result); \
168 return sprintf(buf, "Read error\n"); \
169 } \
170 \
171 static ssize_t \
172 set_bool_##value(struct device *dev, struct device_attribute *attr, \
173 const char *buf, size_t count) \
174 { \
175 u32 tmp = simple_strtoul(buf, NULL, 10); \
176 acpi_status status = set_state(&tmp, instance); \
177 if (ACPI_FAILURE(status)) \
178 return -EINVAL; \
179 return count; \
180 } \
181 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
182 show_bool_##value, set_bool_##value);
183
184 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
185 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
186
remove_fs(void)187 static void remove_fs(void)
188 {
189 device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
190 device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
191 }
192
add_fs(void)193 static int add_fs(void)
194 {
195 int ret;
196
197 ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
198 if (ret)
199 goto add_sysfs_error;
200
201 ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
202 if (ret)
203 goto add_sysfs_error;
204
205 return ret;
206
207 add_sysfs_error:
208 remove_fs();
209 return ret;
210 }
211
212 /* --------------------------------------------------------------------------
213 Driver Model
214 -------------------------------------------------------------------------- */
215
tc1100_probe(struct platform_device * device)216 static int tc1100_probe(struct platform_device *device)
217 {
218 int result = 0;
219
220 result = add_fs();
221 return result;
222 }
223
224
tc1100_remove(struct platform_device * device)225 static int tc1100_remove(struct platform_device *device)
226 {
227 remove_fs();
228 return 0;
229 }
230
tc1100_suspend(struct platform_device * dev,pm_message_t state)231 static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
232 {
233 int ret;
234
235 ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
236 if (ret)
237 return ret;
238
239 ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
240 if (ret)
241 return ret;
242
243 return ret;
244 }
245
tc1100_resume(struct platform_device * dev)246 static int tc1100_resume(struct platform_device *dev)
247 {
248 int ret;
249
250 ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
251 if (ret)
252 return ret;
253
254 ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
255 if (ret)
256 return ret;
257
258 return ret;
259 }
260
tc1100_init(void)261 static int __init tc1100_init(void)
262 {
263 int result = 0;
264
265 if (!wmi_has_guid(GUID))
266 return -ENODEV;
267
268 result = platform_driver_register(&tc1100_driver);
269 if (result)
270 return result;
271
272 tc1100_device = platform_device_alloc("tc1100-wmi", -1);
273 platform_device_add(tc1100_device);
274
275 printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
276
277 return result;
278 }
279
tc1100_exit(void)280 static void __exit tc1100_exit(void)
281 {
282 platform_device_del(tc1100_device);
283 platform_driver_unregister(&tc1100_driver);
284
285 printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
286 }
287
288 module_init(tc1100_init);
289 module_exit(tc1100_exit);
290