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