1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  HP Compaq TC1100 Tablet WMI Extras Driver
4 *
5 *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
6 *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
7 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/acpi.h>
19#include <linux/platform_device.h>
20
21#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
22
23#define TC1100_INSTANCE_WIRELESS		1
24#define TC1100_INSTANCE_JOGDIAL		2
25
26MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
27MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
28MODULE_LICENSE("GPL");
29MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
30
31static struct platform_device *tc1100_device;
32
33struct tc1100_data {
34	u32 wireless;
35	u32 jogdial;
36};
37
38#ifdef CONFIG_PM
39static struct tc1100_data suspend_data;
40#endif
41
42/* --------------------------------------------------------------------------
43				Device Management
44   -------------------------------------------------------------------------- */
45
46static int get_state(u32 *out, u8 instance)
47{
48	u32 tmp;
49	acpi_status status;
50	struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
51	union acpi_object *obj;
52
53	if (!out)
54		return -EINVAL;
55
56	if (instance > 2)
57		return -ENODEV;
58
59	status = wmi_query_block(GUID, instance, &result);
60	if (ACPI_FAILURE(status))
61		return -ENODEV;
62
63	obj = (union acpi_object *) result.pointer;
64	if (obj && obj->type == ACPI_TYPE_INTEGER) {
65		tmp = obj->integer.value;
66	} else {
67		tmp = 0;
68	}
69
70	if (result.length > 0)
71		kfree(result.pointer);
72
73	switch (instance) {
74	case TC1100_INSTANCE_WIRELESS:
75		*out = (tmp == 3) ? 1 : 0;
76		return 0;
77	case TC1100_INSTANCE_JOGDIAL:
78		*out = (tmp == 1) ? 0 : 1;
79		return 0;
80	default:
81		return -ENODEV;
82	}
83}
84
85static int set_state(u32 *in, u8 instance)
86{
87	u32 value;
88	acpi_status status;
89	struct acpi_buffer input;
90
91	if (!in)
92		return -EINVAL;
93
94	if (instance > 2)
95		return -ENODEV;
96
97	switch (instance) {
98	case TC1100_INSTANCE_WIRELESS:
99		value = (*in) ? 1 : 2;
100		break;
101	case TC1100_INSTANCE_JOGDIAL:
102		value = (*in) ? 0 : 1;
103		break;
104	default:
105		return -ENODEV;
106	}
107
108	input.length = sizeof(u32);
109	input.pointer = &value;
110
111	status = wmi_set_block(GUID, instance, &input);
112	if (ACPI_FAILURE(status))
113		return -ENODEV;
114
115	return 0;
116}
117
118/* --------------------------------------------------------------------------
119				FS Interface (/sys)
120   -------------------------------------------------------------------------- */
121
122/*
123 * Read/ write bool sysfs macro
124 */
125#define show_set_bool(value, instance) \
126static ssize_t \
127show_bool_##value(struct device *dev, struct device_attribute *attr, \
128	char *buf) \
129{ \
130	u32 result; \
131	acpi_status status = get_state(&result, instance); \
132	if (ACPI_SUCCESS(status)) \
133		return sprintf(buf, "%d\n", result); \
134	return sprintf(buf, "Read error\n"); \
135} \
136\
137static ssize_t \
138set_bool_##value(struct device *dev, struct device_attribute *attr, \
139	const char *buf, size_t count) \
140{ \
141	u32 tmp = simple_strtoul(buf, NULL, 10); \
142	acpi_status status = set_state(&tmp, instance); \
143		if (ACPI_FAILURE(status)) \
144			return -EINVAL; \
145	return count; \
146} \
147static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
148	show_bool_##value, set_bool_##value);
149
150show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
151show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
152
153static struct attribute *tc1100_attributes[] = {
154	&dev_attr_wireless.attr,
155	&dev_attr_jogdial.attr,
156	NULL
157};
158
159static const struct attribute_group tc1100_attribute_group = {
160	.attrs	= tc1100_attributes,
161};
162
163/* --------------------------------------------------------------------------
164				Driver Model
165   -------------------------------------------------------------------------- */
166
167static int __init tc1100_probe(struct platform_device *device)
168{
169	return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
170}
171
172
173static void tc1100_remove(struct platform_device *device)
174{
175	sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
176}
177
178#ifdef CONFIG_PM
179static int tc1100_suspend(struct device *dev)
180{
181	int ret;
182
183	ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
184	if (ret)
185		return ret;
186
187	ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
188	if (ret)
189		return ret;
190
191	return 0;
192}
193
194static int tc1100_resume(struct device *dev)
195{
196	int ret;
197
198	ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
199	if (ret)
200		return ret;
201
202	ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
203	if (ret)
204		return ret;
205
206	return 0;
207}
208
209static const struct dev_pm_ops tc1100_pm_ops = {
210	.suspend	= tc1100_suspend,
211	.resume		= tc1100_resume,
212	.freeze		= tc1100_suspend,
213	.restore	= tc1100_resume,
214};
215#endif
216
217static struct platform_driver tc1100_driver = {
218	.driver = {
219		.name = "tc1100-wmi",
220#ifdef CONFIG_PM
221		.pm = &tc1100_pm_ops,
222#endif
223	},
224	.remove_new = tc1100_remove,
225};
226
227static int __init tc1100_init(void)
228{
229	int error;
230
231	if (!wmi_has_guid(GUID))
232		return -ENODEV;
233
234	tc1100_device = platform_device_alloc("tc1100-wmi", PLATFORM_DEVID_NONE);
235	if (!tc1100_device)
236		return -ENOMEM;
237
238	error = platform_device_add(tc1100_device);
239	if (error)
240		goto err_device_put;
241
242	error = platform_driver_probe(&tc1100_driver, tc1100_probe);
243	if (error)
244		goto err_device_del;
245
246	pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
247	return 0;
248
249 err_device_del:
250	platform_device_del(tc1100_device);
251 err_device_put:
252	platform_device_put(tc1100_device);
253	return error;
254}
255
256static void __exit tc1100_exit(void)
257{
258	platform_device_unregister(tc1100_device);
259	platform_driver_unregister(&tc1100_driver);
260}
261
262module_init(tc1100_init);
263module_exit(tc1100_exit);
264