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817a5cdb PR |
1 | /* |
2 | Dell Airplane Mode Switch driver | |
3 | Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/acpi.h> | |
18 | #include <linux/rfkill.h> | |
19 | #include <linux/input.h> | |
20 | ||
21 | enum rbtn_type { | |
22 | RBTN_UNKNOWN, | |
23 | RBTN_TOGGLE, | |
24 | RBTN_SLIDER, | |
25 | }; | |
26 | ||
27 | struct rbtn_data { | |
28 | enum rbtn_type type; | |
29 | struct rfkill *rfkill; | |
30 | struct input_dev *input_dev; | |
31 | }; | |
32 | ||
33 | ||
34 | /* | |
35 | * acpi functions | |
36 | */ | |
37 | ||
38 | static enum rbtn_type rbtn_check(struct acpi_device *device) | |
39 | { | |
40 | unsigned long long output; | |
41 | acpi_status status; | |
42 | ||
43 | status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output); | |
44 | if (ACPI_FAILURE(status)) | |
45 | return RBTN_UNKNOWN; | |
46 | ||
47 | switch (output) { | |
48 | case 0: | |
49 | case 1: | |
50 | return RBTN_TOGGLE; | |
51 | case 2: | |
52 | case 3: | |
53 | return RBTN_SLIDER; | |
54 | default: | |
55 | return RBTN_UNKNOWN; | |
56 | } | |
57 | } | |
58 | ||
59 | static int rbtn_get(struct acpi_device *device) | |
60 | { | |
61 | unsigned long long output; | |
62 | acpi_status status; | |
63 | ||
64 | status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output); | |
65 | if (ACPI_FAILURE(status)) | |
66 | return -EINVAL; | |
67 | ||
68 | return !output; | |
69 | } | |
70 | ||
71 | static int rbtn_acquire(struct acpi_device *device, bool enable) | |
72 | { | |
73 | struct acpi_object_list input; | |
74 | union acpi_object param; | |
75 | acpi_status status; | |
76 | ||
77 | param.type = ACPI_TYPE_INTEGER; | |
78 | param.integer.value = enable; | |
79 | input.count = 1; | |
80 | input.pointer = ¶m; | |
81 | ||
82 | status = acpi_evaluate_object(device->handle, "ARBT", &input, NULL); | |
83 | if (ACPI_FAILURE(status)) | |
84 | return -EINVAL; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | ||
90 | /* | |
91 | * rfkill device | |
92 | */ | |
93 | ||
94 | static void rbtn_rfkill_query(struct rfkill *rfkill, void *data) | |
95 | { | |
96 | struct acpi_device *device = data; | |
97 | int state; | |
98 | ||
99 | state = rbtn_get(device); | |
100 | if (state < 0) | |
101 | return; | |
102 | ||
103 | rfkill_set_states(rfkill, state, state); | |
104 | } | |
105 | ||
106 | static int rbtn_rfkill_set_block(void *data, bool blocked) | |
107 | { | |
108 | /* NOTE: setting soft rfkill state is not supported */ | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | static struct rfkill_ops rbtn_ops = { | |
113 | .query = rbtn_rfkill_query, | |
114 | .set_block = rbtn_rfkill_set_block, | |
115 | }; | |
116 | ||
117 | static int rbtn_rfkill_init(struct acpi_device *device) | |
118 | { | |
119 | struct rbtn_data *rbtn_data = device->driver_data; | |
120 | int ret; | |
121 | ||
122 | if (rbtn_data->rfkill) | |
123 | return 0; | |
124 | ||
125 | /* | |
126 | * NOTE: rbtn controls all radio devices, not only WLAN | |
127 | * but rfkill interface does not support "ANY" type | |
128 | * so "WLAN" type is used | |
129 | */ | |
130 | rbtn_data->rfkill = rfkill_alloc("dell-rbtn", &device->dev, | |
131 | RFKILL_TYPE_WLAN, &rbtn_ops, device); | |
132 | if (!rbtn_data->rfkill) | |
133 | return -ENOMEM; | |
134 | ||
135 | ret = rfkill_register(rbtn_data->rfkill); | |
136 | if (ret) { | |
137 | rfkill_destroy(rbtn_data->rfkill); | |
138 | rbtn_data->rfkill = NULL; | |
139 | return ret; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static void rbtn_rfkill_exit(struct acpi_device *device) | |
146 | { | |
147 | struct rbtn_data *rbtn_data = device->driver_data; | |
148 | ||
149 | if (!rbtn_data->rfkill) | |
150 | return; | |
151 | ||
152 | rfkill_unregister(rbtn_data->rfkill); | |
153 | rfkill_destroy(rbtn_data->rfkill); | |
154 | rbtn_data->rfkill = NULL; | |
155 | } | |
156 | ||
157 | static void rbtn_rfkill_event(struct acpi_device *device) | |
158 | { | |
159 | struct rbtn_data *rbtn_data = device->driver_data; | |
160 | ||
161 | if (rbtn_data->rfkill) | |
162 | rbtn_rfkill_query(rbtn_data->rfkill, device); | |
163 | } | |
164 | ||
165 | ||
166 | /* | |
167 | * input device | |
168 | */ | |
169 | ||
170 | static int rbtn_input_init(struct rbtn_data *rbtn_data) | |
171 | { | |
172 | int ret; | |
173 | ||
174 | rbtn_data->input_dev = input_allocate_device(); | |
175 | if (!rbtn_data->input_dev) | |
176 | return -ENOMEM; | |
177 | ||
178 | rbtn_data->input_dev->name = "DELL Wireless hotkeys"; | |
179 | rbtn_data->input_dev->phys = "dellabce/input0"; | |
180 | rbtn_data->input_dev->id.bustype = BUS_HOST; | |
181 | rbtn_data->input_dev->evbit[0] = BIT(EV_KEY); | |
182 | set_bit(KEY_RFKILL, rbtn_data->input_dev->keybit); | |
183 | ||
184 | ret = input_register_device(rbtn_data->input_dev); | |
185 | if (ret) { | |
186 | input_free_device(rbtn_data->input_dev); | |
187 | rbtn_data->input_dev = NULL; | |
188 | return ret; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static void rbtn_input_exit(struct rbtn_data *rbtn_data) | |
195 | { | |
196 | input_unregister_device(rbtn_data->input_dev); | |
197 | rbtn_data->input_dev = NULL; | |
198 | } | |
199 | ||
200 | static void rbtn_input_event(struct rbtn_data *rbtn_data) | |
201 | { | |
202 | input_report_key(rbtn_data->input_dev, KEY_RFKILL, 1); | |
203 | input_sync(rbtn_data->input_dev); | |
204 | input_report_key(rbtn_data->input_dev, KEY_RFKILL, 0); | |
205 | input_sync(rbtn_data->input_dev); | |
206 | } | |
207 | ||
208 | ||
209 | /* | |
210 | * acpi driver | |
211 | */ | |
212 | ||
213 | static int rbtn_add(struct acpi_device *device); | |
214 | static int rbtn_remove(struct acpi_device *device); | |
215 | static void rbtn_notify(struct acpi_device *device, u32 event); | |
216 | ||
217 | static const struct acpi_device_id rbtn_ids[] = { | |
218 | { "DELRBTN", 0 }, | |
219 | { "DELLABCE", 0 }, | |
220 | { "", 0 }, | |
221 | }; | |
222 | ||
223 | static struct acpi_driver rbtn_driver = { | |
224 | .name = "dell-rbtn", | |
225 | .ids = rbtn_ids, | |
226 | .ops = { | |
227 | .add = rbtn_add, | |
228 | .remove = rbtn_remove, | |
229 | .notify = rbtn_notify, | |
230 | }, | |
231 | .owner = THIS_MODULE, | |
232 | }; | |
233 | ||
234 | ||
b05ffc95 PR |
235 | /* |
236 | * notifier export functions | |
237 | */ | |
238 | ||
239 | static bool auto_remove_rfkill = true; | |
240 | ||
241 | static ATOMIC_NOTIFIER_HEAD(rbtn_chain_head); | |
242 | ||
243 | static int rbtn_inc_count(struct device *dev, void *data) | |
244 | { | |
245 | struct acpi_device *device = to_acpi_device(dev); | |
246 | struct rbtn_data *rbtn_data = device->driver_data; | |
247 | int *count = data; | |
248 | ||
249 | if (rbtn_data->type == RBTN_SLIDER) | |
250 | (*count)++; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int rbtn_switch_dev(struct device *dev, void *data) | |
256 | { | |
257 | struct acpi_device *device = to_acpi_device(dev); | |
258 | struct rbtn_data *rbtn_data = device->driver_data; | |
259 | bool enable = data; | |
260 | ||
261 | if (rbtn_data->type != RBTN_SLIDER) | |
262 | return 0; | |
263 | ||
264 | if (enable) | |
265 | rbtn_rfkill_init(device); | |
266 | else | |
267 | rbtn_rfkill_exit(device); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | int dell_rbtn_notifier_register(struct notifier_block *nb) | |
273 | { | |
274 | bool first; | |
275 | int count; | |
276 | int ret; | |
277 | ||
278 | count = 0; | |
279 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, &count, | |
280 | rbtn_inc_count); | |
281 | if (ret || count == 0) | |
282 | return -ENODEV; | |
283 | ||
284 | first = !rbtn_chain_head.head; | |
285 | ||
286 | ret = atomic_notifier_chain_register(&rbtn_chain_head, nb); | |
287 | if (ret != 0) | |
288 | return ret; | |
289 | ||
290 | if (auto_remove_rfkill && first) | |
291 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, | |
292 | (void *)false, rbtn_switch_dev); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(dell_rbtn_notifier_register); | |
297 | ||
298 | int dell_rbtn_notifier_unregister(struct notifier_block *nb) | |
299 | { | |
300 | int ret; | |
301 | ||
302 | ret = atomic_notifier_chain_unregister(&rbtn_chain_head, nb); | |
303 | if (ret != 0) | |
304 | return ret; | |
305 | ||
306 | if (auto_remove_rfkill && !rbtn_chain_head.head) | |
307 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, | |
308 | (void *)true, rbtn_switch_dev); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | EXPORT_SYMBOL_GPL(dell_rbtn_notifier_unregister); | |
313 | ||
314 | ||
817a5cdb PR |
315 | /* |
316 | * acpi driver functions | |
317 | */ | |
318 | ||
319 | static int rbtn_add(struct acpi_device *device) | |
320 | { | |
321 | struct rbtn_data *rbtn_data; | |
322 | enum rbtn_type type; | |
323 | int ret = 0; | |
324 | ||
325 | type = rbtn_check(device); | |
326 | if (type == RBTN_UNKNOWN) { | |
327 | dev_info(&device->dev, "Unknown device type\n"); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
331 | ret = rbtn_acquire(device, true); | |
332 | if (ret < 0) { | |
333 | dev_err(&device->dev, "Cannot enable device\n"); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL); | |
338 | if (!rbtn_data) | |
339 | return -ENOMEM; | |
340 | ||
341 | rbtn_data->type = type; | |
342 | device->driver_data = rbtn_data; | |
343 | ||
344 | switch (rbtn_data->type) { | |
345 | case RBTN_TOGGLE: | |
346 | ret = rbtn_input_init(rbtn_data); | |
347 | break; | |
348 | case RBTN_SLIDER: | |
b05ffc95 PR |
349 | if (auto_remove_rfkill && rbtn_chain_head.head) |
350 | ret = 0; | |
351 | else | |
352 | ret = rbtn_rfkill_init(device); | |
817a5cdb PR |
353 | break; |
354 | default: | |
355 | ret = -EINVAL; | |
356 | } | |
357 | ||
358 | return ret; | |
359 | ||
360 | } | |
361 | ||
362 | static int rbtn_remove(struct acpi_device *device) | |
363 | { | |
364 | struct rbtn_data *rbtn_data = device->driver_data; | |
365 | ||
366 | switch (rbtn_data->type) { | |
367 | case RBTN_TOGGLE: | |
368 | rbtn_input_exit(rbtn_data); | |
369 | break; | |
370 | case RBTN_SLIDER: | |
371 | rbtn_rfkill_exit(device); | |
372 | break; | |
373 | default: | |
374 | break; | |
375 | } | |
376 | ||
377 | rbtn_acquire(device, false); | |
378 | device->driver_data = NULL; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void rbtn_notify(struct acpi_device *device, u32 event) | |
384 | { | |
385 | struct rbtn_data *rbtn_data = device->driver_data; | |
386 | ||
387 | if (event != 0x80) { | |
388 | dev_info(&device->dev, "Received unknown event (0x%x)\n", | |
389 | event); | |
390 | return; | |
391 | } | |
392 | ||
393 | switch (rbtn_data->type) { | |
394 | case RBTN_TOGGLE: | |
395 | rbtn_input_event(rbtn_data); | |
396 | break; | |
397 | case RBTN_SLIDER: | |
398 | rbtn_rfkill_event(device); | |
b05ffc95 | 399 | atomic_notifier_call_chain(&rbtn_chain_head, event, device); |
817a5cdb PR |
400 | break; |
401 | default: | |
402 | break; | |
403 | } | |
404 | } | |
405 | ||
406 | ||
407 | /* | |
408 | * module functions | |
409 | */ | |
410 | ||
411 | module_acpi_driver(rbtn_driver); | |
412 | ||
b05ffc95 PR |
413 | module_param(auto_remove_rfkill, bool, 0444); |
414 | ||
415 | MODULE_PARM_DESC(auto_remove_rfkill, "Automatically remove rfkill devices when " | |
416 | "other modules start receiving events " | |
417 | "from this module and re-add them when " | |
418 | "the last module stops receiving events " | |
419 | "(default true)"); | |
817a5cdb PR |
420 | MODULE_DEVICE_TABLE(acpi, rbtn_ids); |
421 | MODULE_DESCRIPTION("Dell Airplane Mode Switch driver"); | |
422 | MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); | |
423 | MODULE_LICENSE("GPL"); |