summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/tc1100-wmi.c
blob: 9072eb30261856d23e5fc8a1f49e99270d0c101f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HP Compaq TC1100 Tablet WMI Extras Driver
 *
 *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
 *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>

#define GUID "C364AC71-36DB-495A-8494-B439D472A505"

#define TC1100_INSTANCE_WIRELESS		1
#define TC1100_INSTANCE_JOGDIAL		2

MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");

static struct platform_device *tc1100_device;

struct tc1100_data {
	u32 wireless;
	u32 jogdial;
};

#ifdef CONFIG_PM
static struct tc1100_data suspend_data;
#endif

/* --------------------------------------------------------------------------
				Device Management
   -------------------------------------------------------------------------- */

static int get_state(u32 *out, u8 instance)
{
	u32 tmp;
	acpi_status status;
	struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;

	if (!out)
		return -EINVAL;

	if (instance > 2)
		return -ENODEV;

	status = wmi_query_block(GUID, instance, &result);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	obj = (union acpi_object *) result.pointer;
	if (obj && obj->type == ACPI_TYPE_INTEGER) {
		tmp = obj->integer.value;
	} else {
		tmp = 0;
	}

	if (result.length > 0)
		kfree(result.pointer);

	switch (instance) {
	case TC1100_INSTANCE_WIRELESS:
		*out = (tmp == 3) ? 1 : 0;
		return 0;
	case TC1100_INSTANCE_JOGDIAL:
		*out = (tmp == 1) ? 0 : 1;
		return 0;
	default:
		return -ENODEV;
	}
}

static int set_state(u32 *in, u8 instance)
{
	u32 value;
	acpi_status status;
	struct acpi_buffer input;

	if (!in)
		return -EINVAL;

	if (instance > 2)
		return -ENODEV;

	switch (instance) {
	case TC1100_INSTANCE_WIRELESS:
		value = (*in) ? 1 : 2;
		break;
	case TC1100_INSTANCE_JOGDIAL:
		value = (*in) ? 0 : 1;
		break;
	default:
		return -ENODEV;
	}

	input.length = sizeof(u32);
	input.pointer = &value;

	status = wmi_set_block(GUID, instance, &input);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return 0;
}

/* --------------------------------------------------------------------------
				FS Interface (/sys)
   -------------------------------------------------------------------------- */

/*
 * Read/ write bool sysfs macro
 */
#define show_set_bool(value, instance) \
static ssize_t \
show_bool_##value(struct device *dev, struct device_attribute *attr, \
	char *buf) \
{ \
	u32 result; \
	acpi_status status = get_state(&result, instance); \
	if (ACPI_SUCCESS(status)) \
		return sprintf(buf, "%d\n", result); \
	return sprintf(buf, "Read error\n"); \
} \
\
static ssize_t \
set_bool_##value(struct device *dev, struct device_attribute *attr, \
	const char *buf, size_t count) \
{ \
	u32 tmp = simple_strtoul(buf, NULL, 10); \
	acpi_status status = set_state(&tmp, instance); \
		if (ACPI_FAILURE(status)) \
			return -EINVAL; \
	return count; \
} \
static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
	show_bool_##value, set_bool_##value);

show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);

static struct attribute *tc1100_attributes[] = {
	&dev_attr_wireless.attr,
	&dev_attr_jogdial.attr,
	NULL
};

static const struct attribute_group tc1100_attribute_group = {
	.attrs	= tc1100_attributes,
};

/* --------------------------------------------------------------------------
				Driver Model
   -------------------------------------------------------------------------- */

static int __init tc1100_probe(struct platform_device *device)
{
	return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
}


static int tc1100_remove(struct platform_device *device)
{
	sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);

	return 0;
}

#ifdef CONFIG_PM
static int tc1100_suspend(struct device *dev)
{
	int ret;

	ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
	if (ret)
		return ret;

	ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
	if (ret)
		return ret;

	return 0;
}

static int tc1100_resume(struct device *dev)
{
	int ret;

	ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
	if (ret)
		return ret;

	ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
	if (ret)
		return ret;

	return 0;
}

static const struct dev_pm_ops tc1100_pm_ops = {
	.suspend	= tc1100_suspend,
	.resume		= tc1100_resume,
	.freeze		= tc1100_suspend,
	.restore	= tc1100_resume,
};
#endif

static struct platform_driver tc1100_driver = {
	.driver = {
		.name = "tc1100-wmi",
#ifdef CONFIG_PM
		.pm = &tc1100_pm_ops,
#endif
	},
	.remove = tc1100_remove,
};

static int __init tc1100_init(void)
{
	int error;

	if (!wmi_has_guid(GUID))
		return -ENODEV;

	tc1100_device = platform_device_alloc("tc1100-wmi", -1);
	if (!tc1100_device)
		return -ENOMEM;

	error = platform_device_add(tc1100_device);
	if (error)
		goto err_device_put;

	error = platform_driver_probe(&tc1100_driver, tc1100_probe);
	if (error)
		goto err_device_del;

	pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
	return 0;

 err_device_del:
	platform_device_del(tc1100_device);
 err_device_put:
	platform_device_put(tc1100_device);
	return error;
}

static void __exit tc1100_exit(void)
{
	platform_device_unregister(tc1100_device);
	platform_driver_unregister(&tc1100_driver);
}

module_init(tc1100_init);
module_exit(tc1100_exit);