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/slab.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <acpi/acpi.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
46 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
47 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
48 MODULE_LICENSE("GPL");
49 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
50
51 static struct platform_device *tc1100_device;
52
53 struct tc1100_data {
54 u32 wireless;
55 u32 jogdial;
56 };
57
58 static struct tc1100_data suspend_data;
59
60 /* --------------------------------------------------------------------------
61 Device Management
62 -------------------------------------------------------------------------- */
63
get_state(u32 * out,u8 instance)64 static int get_state(u32 *out, u8 instance)
65 {
66 u32 tmp;
67 acpi_status status;
68 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
69 union acpi_object *obj;
70
71 if (!out)
72 return -EINVAL;
73
74 if (instance > 2)
75 return -ENODEV;
76
77 status = wmi_query_block(GUID, instance, &result);
78 if (ACPI_FAILURE(status))
79 return -ENODEV;
80
81 obj = (union acpi_object *) result.pointer;
82 if (obj && obj->type == ACPI_TYPE_INTEGER) {
83 tmp = obj->integer.value;
84 } else {
85 tmp = 0;
86 }
87
88 if (result.length > 0 && result.pointer)
89 kfree(result.pointer);
90
91 switch (instance) {
92 case TC1100_INSTANCE_WIRELESS:
93 *out = (tmp == 3) ? 1 : 0;
94 return 0;
95 case TC1100_INSTANCE_JOGDIAL:
96 *out = (tmp == 1) ? 0 : 1;
97 return 0;
98 default:
99 return -ENODEV;
100 }
101 }
102
set_state(u32 * in,u8 instance)103 static int set_state(u32 *in, u8 instance)
104 {
105 u32 value;
106 acpi_status status;
107 struct acpi_buffer input;
108
109 if (!in)
110 return -EINVAL;
111
112 if (instance > 2)
113 return -ENODEV;
114
115 switch (instance) {
116 case TC1100_INSTANCE_WIRELESS:
117 value = (*in) ? 1 : 2;
118 break;
119 case TC1100_INSTANCE_JOGDIAL:
120 value = (*in) ? 0 : 1;
121 break;
122 default:
123 return -ENODEV;
124 }
125
126 input.length = sizeof(u32);
127 input.pointer = &value;
128
129 status = wmi_set_block(GUID, instance, &input);
130 if (ACPI_FAILURE(status))
131 return -ENODEV;
132
133 return 0;
134 }
135
136 /* --------------------------------------------------------------------------
137 FS Interface (/sys)
138 -------------------------------------------------------------------------- */
139
140 /*
141 * Read/ write bool sysfs macro
142 */
143 #define show_set_bool(value, instance) \
144 static ssize_t \
145 show_bool_##value(struct device *dev, struct device_attribute *attr, \
146 char *buf) \
147 { \
148 u32 result; \
149 acpi_status status = get_state(&result, instance); \
150 if (ACPI_SUCCESS(status)) \
151 return sprintf(buf, "%d\n", result); \
152 return sprintf(buf, "Read error\n"); \
153 } \
154 \
155 static ssize_t \
156 set_bool_##value(struct device *dev, struct device_attribute *attr, \
157 const char *buf, size_t count) \
158 { \
159 u32 tmp = simple_strtoul(buf, NULL, 10); \
160 acpi_status status = set_state(&tmp, instance); \
161 if (ACPI_FAILURE(status)) \
162 return -EINVAL; \
163 return count; \
164 } \
165 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
166 show_bool_##value, set_bool_##value);
167
168 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
169 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
170
171 static struct attribute *tc1100_attributes[] = {
172 &dev_attr_wireless.attr,
173 &dev_attr_jogdial.attr,
174 NULL
175 };
176
177 static struct attribute_group tc1100_attribute_group = {
178 .attrs = tc1100_attributes,
179 };
180
181 /* --------------------------------------------------------------------------
182 Driver Model
183 -------------------------------------------------------------------------- */
184
tc1100_probe(struct platform_device * device)185 static int __init tc1100_probe(struct platform_device *device)
186 {
187 return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
188 }
189
190
tc1100_remove(struct platform_device * device)191 static int __devexit tc1100_remove(struct platform_device *device)
192 {
193 sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
194
195 return 0;
196 }
197
198 #ifdef CONFIG_PM
tc1100_suspend(struct device * dev)199 static int tc1100_suspend(struct device *dev)
200 {
201 int ret;
202
203 ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
204 if (ret)
205 return ret;
206
207 ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
208 if (ret)
209 return ret;
210
211 return 0;
212 }
213
tc1100_resume(struct device * dev)214 static int tc1100_resume(struct device *dev)
215 {
216 int ret;
217
218 ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
219 if (ret)
220 return ret;
221
222 ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
223 if (ret)
224 return ret;
225
226 return 0;
227 }
228
229 static const struct dev_pm_ops tc1100_pm_ops = {
230 .suspend = tc1100_suspend,
231 .resume = tc1100_resume,
232 .freeze = tc1100_suspend,
233 .restore = tc1100_resume,
234 };
235 #endif
236
237 static struct platform_driver tc1100_driver = {
238 .driver = {
239 .name = "tc1100-wmi",
240 .owner = THIS_MODULE,
241 #ifdef CONFIG_PM
242 .pm = &tc1100_pm_ops,
243 #endif
244 },
245 .remove = __devexit_p(tc1100_remove),
246 };
247
tc1100_init(void)248 static int __init tc1100_init(void)
249 {
250 int error;
251
252 if (!wmi_has_guid(GUID))
253 return -ENODEV;
254
255 tc1100_device = platform_device_alloc("tc1100-wmi", -1);
256 if (!tc1100_device)
257 return -ENOMEM;
258
259 error = platform_device_add(tc1100_device);
260 if (error)
261 goto err_device_put;
262
263 error = platform_driver_probe(&tc1100_driver, tc1100_probe);
264 if (error)
265 goto err_device_del;
266
267 printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
268 return 0;
269
270 err_device_del:
271 platform_device_del(tc1100_device);
272 err_device_put:
273 platform_device_put(tc1100_device);
274 return error;
275 }
276
tc1100_exit(void)277 static void __exit tc1100_exit(void)
278 {
279 platform_device_unregister(tc1100_device);
280 platform_driver_unregister(&tc1100_driver);
281 }
282
283 module_init(tc1100_init);
284 module_exit(tc1100_exit);
285