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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; | |
ff865123 | 31 | bool suspended; |
817a5cdb PR |
32 | }; |
33 | ||
34 | ||
35 | /* | |
36 | * acpi functions | |
37 | */ | |
38 | ||
39 | static enum rbtn_type rbtn_check(struct acpi_device *device) | |
40 | { | |
41 | unsigned long long output; | |
42 | acpi_status status; | |
43 | ||
44 | status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output); | |
45 | if (ACPI_FAILURE(status)) | |
46 | return RBTN_UNKNOWN; | |
47 | ||
48 | switch (output) { | |
49 | case 0: | |
50 | case 1: | |
51 | return RBTN_TOGGLE; | |
52 | case 2: | |
53 | case 3: | |
54 | return RBTN_SLIDER; | |
55 | default: | |
56 | return RBTN_UNKNOWN; | |
57 | } | |
58 | } | |
59 | ||
60 | static int rbtn_get(struct acpi_device *device) | |
61 | { | |
62 | unsigned long long output; | |
63 | acpi_status status; | |
64 | ||
65 | status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output); | |
66 | if (ACPI_FAILURE(status)) | |
67 | return -EINVAL; | |
68 | ||
69 | return !output; | |
70 | } | |
71 | ||
72 | static int rbtn_acquire(struct acpi_device *device, bool enable) | |
73 | { | |
74 | struct acpi_object_list input; | |
75 | union acpi_object param; | |
76 | acpi_status status; | |
77 | ||
78 | param.type = ACPI_TYPE_INTEGER; | |
79 | param.integer.value = enable; | |
80 | input.count = 1; | |
81 | input.pointer = ¶m; | |
82 | ||
83 | status = acpi_evaluate_object(device->handle, "ARBT", &input, NULL); | |
84 | if (ACPI_FAILURE(status)) | |
85 | return -EINVAL; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | ||
91 | /* | |
92 | * rfkill device | |
93 | */ | |
94 | ||
95 | static void rbtn_rfkill_query(struct rfkill *rfkill, void *data) | |
96 | { | |
97 | struct acpi_device *device = data; | |
98 | int state; | |
99 | ||
100 | state = rbtn_get(device); | |
101 | if (state < 0) | |
102 | return; | |
103 | ||
104 | rfkill_set_states(rfkill, state, state); | |
105 | } | |
106 | ||
107 | static int rbtn_rfkill_set_block(void *data, bool blocked) | |
108 | { | |
109 | /* NOTE: setting soft rfkill state is not supported */ | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | static struct rfkill_ops rbtn_ops = { | |
114 | .query = rbtn_rfkill_query, | |
115 | .set_block = rbtn_rfkill_set_block, | |
116 | }; | |
117 | ||
118 | static int rbtn_rfkill_init(struct acpi_device *device) | |
119 | { | |
120 | struct rbtn_data *rbtn_data = device->driver_data; | |
121 | int ret; | |
122 | ||
123 | if (rbtn_data->rfkill) | |
124 | return 0; | |
125 | ||
126 | /* | |
127 | * NOTE: rbtn controls all radio devices, not only WLAN | |
128 | * but rfkill interface does not support "ANY" type | |
129 | * so "WLAN" type is used | |
130 | */ | |
131 | rbtn_data->rfkill = rfkill_alloc("dell-rbtn", &device->dev, | |
132 | RFKILL_TYPE_WLAN, &rbtn_ops, device); | |
133 | if (!rbtn_data->rfkill) | |
134 | return -ENOMEM; | |
135 | ||
136 | ret = rfkill_register(rbtn_data->rfkill); | |
137 | if (ret) { | |
138 | rfkill_destroy(rbtn_data->rfkill); | |
139 | rbtn_data->rfkill = NULL; | |
140 | return ret; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static void rbtn_rfkill_exit(struct acpi_device *device) | |
147 | { | |
148 | struct rbtn_data *rbtn_data = device->driver_data; | |
149 | ||
150 | if (!rbtn_data->rfkill) | |
151 | return; | |
152 | ||
153 | rfkill_unregister(rbtn_data->rfkill); | |
154 | rfkill_destroy(rbtn_data->rfkill); | |
155 | rbtn_data->rfkill = NULL; | |
156 | } | |
157 | ||
158 | static void rbtn_rfkill_event(struct acpi_device *device) | |
159 | { | |
160 | struct rbtn_data *rbtn_data = device->driver_data; | |
161 | ||
162 | if (rbtn_data->rfkill) | |
163 | rbtn_rfkill_query(rbtn_data->rfkill, device); | |
164 | } | |
165 | ||
166 | ||
167 | /* | |
168 | * input device | |
169 | */ | |
170 | ||
171 | static int rbtn_input_init(struct rbtn_data *rbtn_data) | |
172 | { | |
173 | int ret; | |
174 | ||
175 | rbtn_data->input_dev = input_allocate_device(); | |
176 | if (!rbtn_data->input_dev) | |
177 | return -ENOMEM; | |
178 | ||
179 | rbtn_data->input_dev->name = "DELL Wireless hotkeys"; | |
180 | rbtn_data->input_dev->phys = "dellabce/input0"; | |
181 | rbtn_data->input_dev->id.bustype = BUS_HOST; | |
182 | rbtn_data->input_dev->evbit[0] = BIT(EV_KEY); | |
183 | set_bit(KEY_RFKILL, rbtn_data->input_dev->keybit); | |
184 | ||
185 | ret = input_register_device(rbtn_data->input_dev); | |
186 | if (ret) { | |
187 | input_free_device(rbtn_data->input_dev); | |
188 | rbtn_data->input_dev = NULL; | |
189 | return ret; | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static void rbtn_input_exit(struct rbtn_data *rbtn_data) | |
196 | { | |
197 | input_unregister_device(rbtn_data->input_dev); | |
198 | rbtn_data->input_dev = NULL; | |
199 | } | |
200 | ||
201 | static void rbtn_input_event(struct rbtn_data *rbtn_data) | |
202 | { | |
203 | input_report_key(rbtn_data->input_dev, KEY_RFKILL, 1); | |
204 | input_sync(rbtn_data->input_dev); | |
205 | input_report_key(rbtn_data->input_dev, KEY_RFKILL, 0); | |
206 | input_sync(rbtn_data->input_dev); | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
211 | * acpi driver | |
212 | */ | |
213 | ||
214 | static int rbtn_add(struct acpi_device *device); | |
215 | static int rbtn_remove(struct acpi_device *device); | |
216 | static void rbtn_notify(struct acpi_device *device, u32 event); | |
217 | ||
218 | static const struct acpi_device_id rbtn_ids[] = { | |
219 | { "DELRBTN", 0 }, | |
220 | { "DELLABCE", 0 }, | |
4d340c6b AL |
221 | |
222 | /* | |
223 | * This driver can also handle the "DELLABC6" device that | |
224 | * appears on the XPS 13 9350, but that device is disabled | |
225 | * by the DSDT unless booted with acpi_osi="!Windows 2012" | |
226 | * acpi_osi="!Windows 2013". Even if we boot that and bind | |
227 | * the driver, we seem to have inconsistent behavior in | |
228 | * which NetworkManager can get out of sync with the rfkill | |
229 | * state. | |
230 | * | |
231 | * On the XPS 13 9350 and similar laptops, we're not supposed to | |
232 | * use DELLABC6 at all. Instead, we handle the rfkill button | |
233 | * via the intel-hid driver. | |
234 | */ | |
235 | ||
817a5cdb PR |
236 | { "", 0 }, |
237 | }; | |
238 | ||
ff865123 GM |
239 | #ifdef CONFIG_PM_SLEEP |
240 | static void ACPI_SYSTEM_XFACE rbtn_clear_suspended_flag(void *context) | |
241 | { | |
242 | struct rbtn_data *rbtn_data = context; | |
243 | ||
244 | rbtn_data->suspended = false; | |
245 | } | |
246 | ||
247 | static int rbtn_suspend(struct device *dev) | |
248 | { | |
249 | struct acpi_device *device = to_acpi_device(dev); | |
250 | struct rbtn_data *rbtn_data = acpi_driver_data(device); | |
251 | ||
252 | rbtn_data->suspended = true; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int rbtn_resume(struct device *dev) | |
258 | { | |
259 | struct acpi_device *device = to_acpi_device(dev); | |
260 | struct rbtn_data *rbtn_data = acpi_driver_data(device); | |
261 | acpi_status status; | |
262 | ||
263 | /* | |
264 | * Upon resume, some BIOSes send an ACPI notification thet triggers | |
265 | * an unwanted input event. In order to ignore it, we use a flag | |
266 | * that we set at suspend and clear once we have received the extra | |
267 | * ACPI notification. Since ACPI notifications are delivered | |
268 | * asynchronously to drivers, we clear the flag from the workqueue | |
269 | * used to deliver the notifications. This should be enough | |
270 | * to have the flag cleared only after we received the extra | |
271 | * notification, if any. | |
272 | */ | |
273 | status = acpi_os_execute(OSL_NOTIFY_HANDLER, | |
274 | rbtn_clear_suspended_flag, rbtn_data); | |
275 | if (ACPI_FAILURE(status)) | |
276 | rbtn_clear_suspended_flag(rbtn_data); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | #endif | |
281 | ||
282 | static SIMPLE_DEV_PM_OPS(rbtn_pm_ops, rbtn_suspend, rbtn_resume); | |
283 | ||
817a5cdb PR |
284 | static struct acpi_driver rbtn_driver = { |
285 | .name = "dell-rbtn", | |
286 | .ids = rbtn_ids, | |
ff865123 | 287 | .drv.pm = &rbtn_pm_ops, |
817a5cdb PR |
288 | .ops = { |
289 | .add = rbtn_add, | |
290 | .remove = rbtn_remove, | |
291 | .notify = rbtn_notify, | |
292 | }, | |
293 | .owner = THIS_MODULE, | |
294 | }; | |
295 | ||
296 | ||
b05ffc95 PR |
297 | /* |
298 | * notifier export functions | |
299 | */ | |
300 | ||
301 | static bool auto_remove_rfkill = true; | |
302 | ||
303 | static ATOMIC_NOTIFIER_HEAD(rbtn_chain_head); | |
304 | ||
305 | static int rbtn_inc_count(struct device *dev, void *data) | |
306 | { | |
307 | struct acpi_device *device = to_acpi_device(dev); | |
308 | struct rbtn_data *rbtn_data = device->driver_data; | |
309 | int *count = data; | |
310 | ||
311 | if (rbtn_data->type == RBTN_SLIDER) | |
312 | (*count)++; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int rbtn_switch_dev(struct device *dev, void *data) | |
318 | { | |
319 | struct acpi_device *device = to_acpi_device(dev); | |
320 | struct rbtn_data *rbtn_data = device->driver_data; | |
321 | bool enable = data; | |
322 | ||
323 | if (rbtn_data->type != RBTN_SLIDER) | |
324 | return 0; | |
325 | ||
326 | if (enable) | |
327 | rbtn_rfkill_init(device); | |
328 | else | |
329 | rbtn_rfkill_exit(device); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | int dell_rbtn_notifier_register(struct notifier_block *nb) | |
335 | { | |
336 | bool first; | |
337 | int count; | |
338 | int ret; | |
339 | ||
340 | count = 0; | |
341 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, &count, | |
342 | rbtn_inc_count); | |
343 | if (ret || count == 0) | |
344 | return -ENODEV; | |
345 | ||
346 | first = !rbtn_chain_head.head; | |
347 | ||
348 | ret = atomic_notifier_chain_register(&rbtn_chain_head, nb); | |
349 | if (ret != 0) | |
350 | return ret; | |
351 | ||
352 | if (auto_remove_rfkill && first) | |
353 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, | |
354 | (void *)false, rbtn_switch_dev); | |
355 | ||
356 | return ret; | |
357 | } | |
358 | EXPORT_SYMBOL_GPL(dell_rbtn_notifier_register); | |
359 | ||
360 | int dell_rbtn_notifier_unregister(struct notifier_block *nb) | |
361 | { | |
362 | int ret; | |
363 | ||
364 | ret = atomic_notifier_chain_unregister(&rbtn_chain_head, nb); | |
365 | if (ret != 0) | |
366 | return ret; | |
367 | ||
368 | if (auto_remove_rfkill && !rbtn_chain_head.head) | |
369 | ret = driver_for_each_device(&rbtn_driver.drv, NULL, | |
370 | (void *)true, rbtn_switch_dev); | |
371 | ||
372 | return ret; | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(dell_rbtn_notifier_unregister); | |
375 | ||
376 | ||
817a5cdb PR |
377 | /* |
378 | * acpi driver functions | |
379 | */ | |
380 | ||
381 | static int rbtn_add(struct acpi_device *device) | |
382 | { | |
383 | struct rbtn_data *rbtn_data; | |
384 | enum rbtn_type type; | |
385 | int ret = 0; | |
386 | ||
387 | type = rbtn_check(device); | |
388 | if (type == RBTN_UNKNOWN) { | |
389 | dev_info(&device->dev, "Unknown device type\n"); | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | ret = rbtn_acquire(device, true); | |
394 | if (ret < 0) { | |
395 | dev_err(&device->dev, "Cannot enable device\n"); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL); | |
400 | if (!rbtn_data) | |
401 | return -ENOMEM; | |
402 | ||
403 | rbtn_data->type = type; | |
404 | device->driver_data = rbtn_data; | |
405 | ||
406 | switch (rbtn_data->type) { | |
407 | case RBTN_TOGGLE: | |
408 | ret = rbtn_input_init(rbtn_data); | |
409 | break; | |
410 | case RBTN_SLIDER: | |
b05ffc95 PR |
411 | if (auto_remove_rfkill && rbtn_chain_head.head) |
412 | ret = 0; | |
413 | else | |
414 | ret = rbtn_rfkill_init(device); | |
817a5cdb PR |
415 | break; |
416 | default: | |
417 | ret = -EINVAL; | |
418 | } | |
419 | ||
420 | return ret; | |
421 | ||
422 | } | |
423 | ||
424 | static int rbtn_remove(struct acpi_device *device) | |
425 | { | |
426 | struct rbtn_data *rbtn_data = device->driver_data; | |
427 | ||
428 | switch (rbtn_data->type) { | |
429 | case RBTN_TOGGLE: | |
430 | rbtn_input_exit(rbtn_data); | |
431 | break; | |
432 | case RBTN_SLIDER: | |
433 | rbtn_rfkill_exit(device); | |
434 | break; | |
435 | default: | |
436 | break; | |
437 | } | |
438 | ||
439 | rbtn_acquire(device, false); | |
440 | device->driver_data = NULL; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static void rbtn_notify(struct acpi_device *device, u32 event) | |
446 | { | |
447 | struct rbtn_data *rbtn_data = device->driver_data; | |
448 | ||
ff865123 GM |
449 | /* |
450 | * Some BIOSes send a notification at resume. | |
451 | * Ignore it to prevent unwanted input events. | |
452 | */ | |
453 | if (rbtn_data->suspended) { | |
454 | dev_dbg(&device->dev, "ACPI notification ignored\n"); | |
455 | return; | |
456 | } | |
457 | ||
817a5cdb PR |
458 | if (event != 0x80) { |
459 | dev_info(&device->dev, "Received unknown event (0x%x)\n", | |
460 | event); | |
461 | return; | |
462 | } | |
463 | ||
464 | switch (rbtn_data->type) { | |
465 | case RBTN_TOGGLE: | |
466 | rbtn_input_event(rbtn_data); | |
467 | break; | |
468 | case RBTN_SLIDER: | |
469 | rbtn_rfkill_event(device); | |
b05ffc95 | 470 | atomic_notifier_call_chain(&rbtn_chain_head, event, device); |
817a5cdb PR |
471 | break; |
472 | default: | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * module functions | |
480 | */ | |
481 | ||
482 | module_acpi_driver(rbtn_driver); | |
483 | ||
b05ffc95 PR |
484 | module_param(auto_remove_rfkill, bool, 0444); |
485 | ||
486 | MODULE_PARM_DESC(auto_remove_rfkill, "Automatically remove rfkill devices when " | |
487 | "other modules start receiving events " | |
488 | "from this module and re-add them when " | |
489 | "the last module stops receiving events " | |
490 | "(default true)"); | |
817a5cdb PR |
491 | MODULE_DEVICE_TABLE(acpi, rbtn_ids); |
492 | MODULE_DESCRIPTION("Dell Airplane Mode Switch driver"); | |
493 | MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); | |
494 | MODULE_LICENSE("GPL"); |