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
26 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
27 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
28 MODULE_LICENSE("GPL");
29 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
30
31 static struct platform_device *tc1100_device;
32
33 struct tc1100_data {
34 u32 wireless;
35 u32 jogdial;
36 };
37
38 #ifdef CONFIG_PM
39 static struct tc1100_data suspend_data;
40 #endif
41
42 /* --------------------------------------------------------------------------
43 Device Management
44 -------------------------------------------------------------------------- */
45
get_state(u32 * out,u8 instance)46 static 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
set_state(u32 * in,u8 instance)85 static 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) \
126 static ssize_t \
127 show_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 \
137 static ssize_t \
138 set_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 } \
147 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
148 show_bool_##value, set_bool_##value);
149
150 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
151 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
152
153 static struct attribute *tc1100_attributes[] = {
154 &dev_attr_wireless.attr,
155 &dev_attr_jogdial.attr,
156 NULL
157 };
158
159 static const struct attribute_group tc1100_attribute_group = {
160 .attrs = tc1100_attributes,
161 };
162
163 /* --------------------------------------------------------------------------
164 Driver Model
165 -------------------------------------------------------------------------- */
166
tc1100_probe(struct platform_device * device)167 static int __init tc1100_probe(struct platform_device *device)
168 {
169 return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
170 }
171
172
tc1100_remove(struct platform_device * device)173 static void tc1100_remove(struct platform_device *device)
174 {
175 sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
176 }
177
178 #ifdef CONFIG_PM
tc1100_suspend(struct device * dev)179 static 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
tc1100_resume(struct device * dev)194 static 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
209 static 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
217 static 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
tc1100_init(void)227 static 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
tc1100_exit(void)256 static void __exit tc1100_exit(void)
257 {
258 platform_device_unregister(tc1100_device);
259 platform_driver_unregister(&tc1100_driver);
260 }
261
262 module_init(tc1100_init);
263 module_exit(tc1100_exit);
264
