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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/init.h>
34 #include <linux/types.h>
35 #include <linux/acpi.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 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
44 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
45 MODULE_LICENSE("GPL");
46 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
47
48 static struct platform_device *tc1100_device;
49
50 struct tc1100_data {
51 u32 wireless;
52 u32 jogdial;
53 };
54
55 static struct tc1100_data suspend_data;
56
57 /* --------------------------------------------------------------------------
58 Device Management
59 -------------------------------------------------------------------------- */
60
get_state(u32 * out,u8 instance)61 static int get_state(u32 *out, u8 instance)
62 {
63 u32 tmp;
64 acpi_status status;
65 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
66 union acpi_object *obj;
67
68 if (!out)
69 return -EINVAL;
70
71 if (instance > 2)
72 return -ENODEV;
73
74 status = wmi_query_block(GUID, instance, &result);
75 if (ACPI_FAILURE(status))
76 return -ENODEV;
77
78 obj = (union acpi_object *) result.pointer;
79 if (obj && obj->type == ACPI_TYPE_INTEGER) {
80 tmp = obj->integer.value;
81 } else {
82 tmp = 0;
83 }
84
85 if (result.length > 0 && result.pointer)
86 kfree(result.pointer);
87
88 switch (instance) {
89 case TC1100_INSTANCE_WIRELESS:
90 *out = (tmp == 3) ? 1 : 0;
91 return 0;
92 case TC1100_INSTANCE_JOGDIAL:
93 *out = (tmp == 1) ? 0 : 1;
94 return 0;
95 default:
96 return -ENODEV;
97 }
98 }
99
set_state(u32 * in,u8 instance)100 static int set_state(u32 *in, u8 instance)
101 {
102 u32 value;
103 acpi_status status;
104 struct acpi_buffer input;
105
106 if (!in)
107 return -EINVAL;
108
109 if (instance > 2)
110 return -ENODEV;
111
112 switch (instance) {
113 case TC1100_INSTANCE_WIRELESS:
114 value = (*in) ? 1 : 2;
115 break;
116 case TC1100_INSTANCE_JOGDIAL:
117 value = (*in) ? 0 : 1;
118 break;
119 default:
120 return -ENODEV;
121 }
122
123 input.length = sizeof(u32);
124 input.pointer = &value;
125
126 status = wmi_set_block(GUID, instance, &input);
127 if (ACPI_FAILURE(status))
128 return -ENODEV;
129
130 return 0;
131 }
132
133 /* --------------------------------------------------------------------------
134 FS Interface (/sys)
135 -------------------------------------------------------------------------- */
136
137 /*
138 * Read/ write bool sysfs macro
139 */
140 #define show_set_bool(value, instance) \
141 static ssize_t \
142 show_bool_##value(struct device *dev, struct device_attribute *attr, \
143 char *buf) \
144 { \
145 u32 result; \
146 acpi_status status = get_state(&result, instance); \
147 if (ACPI_SUCCESS(status)) \
148 return sprintf(buf, "%d\n", result); \
149 return sprintf(buf, "Read error\n"); \
150 } \
151 \
152 static ssize_t \
153 set_bool_##value(struct device *dev, struct device_attribute *attr, \
154 const char *buf, size_t count) \
155 { \
156 u32 tmp = simple_strtoul(buf, NULL, 10); \
157 acpi_status status = set_state(&tmp, instance); \
158 if (ACPI_FAILURE(status)) \
159 return -EINVAL; \
160 return count; \
161 } \
162 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
163 show_bool_##value, set_bool_##value);
164
165 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
166 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
167
168 static struct attribute *tc1100_attributes[] = {
169 &dev_attr_wireless.attr,
170 &dev_attr_jogdial.attr,
171 NULL
172 };
173
174 static struct attribute_group tc1100_attribute_group = {
175 .attrs = tc1100_attributes,
176 };
177
178 /* --------------------------------------------------------------------------
179 Driver Model
180 -------------------------------------------------------------------------- */
181
tc1100_probe(struct platform_device * device)182 static int __init tc1100_probe(struct platform_device *device)
183 {
184 return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
185 }
186
187
tc1100_remove(struct platform_device * device)188 static int tc1100_remove(struct platform_device *device)
189 {
190 sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
191
192 return 0;
193 }
194
195 #ifdef CONFIG_PM
tc1100_suspend(struct device * dev)196 static int tc1100_suspend(struct device *dev)
197 {
198 int ret;
199
200 ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
201 if (ret)
202 return ret;
203
204 ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
205 if (ret)
206 return ret;
207
208 return 0;
209 }
210
tc1100_resume(struct device * dev)211 static int tc1100_resume(struct device *dev)
212 {
213 int ret;
214
215 ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
216 if (ret)
217 return ret;
218
219 ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
220 if (ret)
221 return ret;
222
223 return 0;
224 }
225
226 static const struct dev_pm_ops tc1100_pm_ops = {
227 .suspend = tc1100_suspend,
228 .resume = tc1100_resume,
229 .freeze = tc1100_suspend,
230 .restore = tc1100_resume,
231 };
232 #endif
233
234 static struct platform_driver tc1100_driver = {
235 .driver = {
236 .name = "tc1100-wmi",
237 #ifdef CONFIG_PM
238 .pm = &tc1100_pm_ops,
239 #endif
240 },
241 .remove = tc1100_remove,
242 };
243
tc1100_init(void)244 static int __init tc1100_init(void)
245 {
246 int error;
247
248 if (!wmi_has_guid(GUID))
249 return -ENODEV;
250
251 tc1100_device = platform_device_alloc("tc1100-wmi", -1);
252 if (!tc1100_device)
253 return -ENOMEM;
254
255 error = platform_device_add(tc1100_device);
256 if (error)
257 goto err_device_put;
258
259 error = platform_driver_probe(&tc1100_driver, tc1100_probe);
260 if (error)
261 goto err_device_del;
262
263 pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
264 return 0;
265
266 err_device_del:
267 platform_device_del(tc1100_device);
268 err_device_put:
269 platform_device_put(tc1100_device);
270 return error;
271 }
272
tc1100_exit(void)273 static void __exit tc1100_exit(void)
274 {
275 platform_device_unregister(tc1100_device);
276 platform_driver_unregister(&tc1100_driver);
277 }
278
279 module_init(tc1100_init);
280 module_exit(tc1100_exit);
281