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
43MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
44MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
45MODULE_LICENSE("GPL");
46MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
47
48static struct platform_device *tc1100_device;
49
50struct tc1100_data {
51	u32 wireless;
52	u32 jogdial;
53};
54
55static struct tc1100_data suspend_data;
56
57/* --------------------------------------------------------------------------
58				Device Management
59   -------------------------------------------------------------------------- */
60
61static 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
100static 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) \
141static ssize_t \
142show_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\
152static ssize_t \
153set_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} \
162static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
163	show_bool_##value, set_bool_##value);
164
165show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
166show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
167
168static struct attribute *tc1100_attributes[] = {
169	&dev_attr_wireless.attr,
170	&dev_attr_jogdial.attr,
171	NULL
172};
173
174static struct attribute_group tc1100_attribute_group = {
175	.attrs	= tc1100_attributes,
176};
177
178/* --------------------------------------------------------------------------
179				Driver Model
180   -------------------------------------------------------------------------- */
181
182static int __init tc1100_probe(struct platform_device *device)
183{
184	return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
185}
186
187
188static 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
196static 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
211static 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
226static 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
234static 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
244static 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
273static void __exit tc1100_exit(void)
274{
275	platform_device_unregister(tc1100_device);
276	platform_driver_unregister(&tc1100_driver);
277}
278
279module_init(tc1100_init);
280module_exit(tc1100_exit);
281