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 | |
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, out: &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(objp: 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 | |
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, in: &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 | |
167 | static int __init tc1100_probe(struct platform_device *device) |
168 | { |
169 | return sysfs_create_group(kobj: &device->dev.kobj, grp: &tc1100_attribute_group); |
170 | } |
171 | |
172 | |
173 | static void tc1100_remove(struct platform_device *device) |
174 | { |
175 | sysfs_remove_group(kobj: &device->dev.kobj, grp: &tc1100_attribute_group); |
176 | } |
177 | |
178 | #ifdef CONFIG_PM |
179 | static int tc1100_suspend(struct device *dev) |
180 | { |
181 | int ret; |
182 | |
183 | ret = get_state(out: &suspend_data.wireless, TC1100_INSTANCE_WIRELESS); |
184 | if (ret) |
185 | return ret; |
186 | |
187 | ret = get_state(out: &suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL); |
188 | if (ret) |
189 | return ret; |
190 | |
191 | return 0; |
192 | } |
193 | |
194 | static int tc1100_resume(struct device *dev) |
195 | { |
196 | int ret; |
197 | |
198 | ret = set_state(in: &suspend_data.wireless, TC1100_INSTANCE_WIRELESS); |
199 | if (ret) |
200 | return ret; |
201 | |
202 | ret = set_state(in: &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 | |
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(name: "tc1100-wmi" , PLATFORM_DEVID_NONE); |
235 | if (!tc1100_device) |
236 | return -ENOMEM; |
237 | |
238 | error = platform_device_add(pdev: 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(pdev: tc1100_device); |
251 | err_device_put: |
252 | platform_device_put(pdev: tc1100_device); |
253 | return error; |
254 | } |
255 | |
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 | |