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6da4cd46 AA |
1 | /* |
2 | * quickstart.c - ACPI Direct App Launch driver | |
3 | * | |
4 | * | |
5 | * Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com> | |
6 | * | |
5c9ed5be | 7 | * Information gathered from disassembled dsdt and from here: |
f94fdeaa | 8 | * <http://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx> |
6da4cd46 AA |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | */ | |
25 | ||
af5728e0 | 26 | #define QUICKSTART_VERSION "1.04" |
6da4cd46 | 27 | |
74eabe4c SJ |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
6da4cd46 AA |
30 | #include <linux/kernel.h> |
31 | #include <linux/module.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/types.h> | |
8b48463f | 34 | #include <linux/acpi.h> |
6da4cd46 AA |
35 | #include <linux/platform_device.h> |
36 | #include <linux/input.h> | |
37 | ||
38 | MODULE_AUTHOR("Angelo Arrifano"); | |
39 | MODULE_DESCRIPTION("ACPI Direct App Launch driver"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
5c9ed5be SJ |
42 | #define QUICKSTART_ACPI_DEVICE_NAME "quickstart" |
43 | #define QUICKSTART_ACPI_CLASS "quickstart" | |
44 | #define QUICKSTART_ACPI_HID "PNP0C32" | |
6da4cd46 | 45 | |
5c9ed5be SJ |
46 | #define QUICKSTART_PF_DRIVER_NAME "quickstart" |
47 | #define QUICKSTART_PF_DEVICE_NAME "quickstart" | |
6da4cd46 | 48 | |
5c9ed5be SJ |
49 | /* |
50 | * There will be two events: | |
51 | * 0x02 - A hot button was pressed while device was off/sleeping. | |
52 | * 0x80 - A hot button was pressed while device was up. | |
53 | */ | |
54 | #define QUICKSTART_EVENT_WAKE 0x02 | |
55 | #define QUICKSTART_EVENT_RUNTIME 0x80 | |
6da4cd46 | 56 | |
3c92e38d | 57 | struct quickstart_button { |
6da4cd46 AA |
58 | char *name; |
59 | unsigned int id; | |
505d2ad2 | 60 | struct list_head list; |
6da4cd46 AA |
61 | }; |
62 | ||
6da4cd46 AA |
63 | struct quickstart_acpi { |
64 | struct acpi_device *device; | |
3c92e38d | 65 | struct quickstart_button *button; |
6da4cd46 | 66 | }; |
6da4cd46 | 67 | |
505d2ad2 | 68 | static LIST_HEAD(buttons); |
3c92e38d | 69 | static struct quickstart_button *pressed; |
6da4cd46 | 70 | |
1692caa9 | 71 | static struct input_dev *quickstart_input; |
6da4cd46 | 72 | |
5c9ed5be | 73 | /* Platform driver functions */ |
3b7cf04f GKH |
74 | static ssize_t buttons_show(struct device *dev, struct device_attribute *attr, |
75 | char *buf) | |
6da4cd46 AA |
76 | { |
77 | int count = 0; | |
3c92e38d | 78 | struct quickstart_button *b; |
6da4cd46 | 79 | |
505d2ad2 | 80 | if (list_empty(&buttons)) |
6da4cd46 AA |
81 | return snprintf(buf, PAGE_SIZE, "none"); |
82 | ||
505d2ad2 | 83 | list_for_each_entry(b, &buttons, list) { |
21c1ddf3 | 84 | count += snprintf(buf + count, PAGE_SIZE - count, "%u\t%s\n", |
505d2ad2 SJ |
85 | b->id, b->name); |
86 | ||
87 | if (count >= PAGE_SIZE) { | |
88 | count = PAGE_SIZE; | |
89 | break; | |
6da4cd46 | 90 | } |
6da4cd46 AA |
91 | } |
92 | ||
93 | return count; | |
94 | } | |
95 | ||
3b7cf04f GKH |
96 | static ssize_t pressed_button_show(struct device *dev, |
97 | struct device_attribute *attr, char *buf) | |
6da4cd46 | 98 | { |
e66912af | 99 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
3991eae9 | 100 | (pressed ? pressed->name : "none")); |
6da4cd46 AA |
101 | } |
102 | ||
103 | ||
3b7cf04f GKH |
104 | static ssize_t pressed_button_store(struct device *dev, |
105 | struct device_attribute *attr, | |
106 | const char *buf, size_t count) | |
6da4cd46 AA |
107 | { |
108 | if (count < 2) | |
109 | return -EINVAL; | |
110 | ||
111 | if (strncasecmp(buf, "none", 4) != 0) | |
112 | return -EINVAL; | |
113 | ||
3991eae9 | 114 | pressed = NULL; |
6da4cd46 AA |
115 | return count; |
116 | } | |
117 | ||
5c9ed5be | 118 | /* Helper functions */ |
3c92e38d | 119 | static struct quickstart_button *quickstart_buttons_add(void) |
6da4cd46 | 120 | { |
3c92e38d | 121 | struct quickstart_button *b; |
6da4cd46 | 122 | |
505d2ad2 SJ |
123 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
124 | if (!b) | |
125 | return NULL; | |
6da4cd46 | 126 | |
505d2ad2 | 127 | list_add_tail(&b->list, &buttons); |
6da4cd46 | 128 | |
505d2ad2 | 129 | return b; |
6da4cd46 AA |
130 | } |
131 | ||
3c92e38d | 132 | static void quickstart_button_del(struct quickstart_button *data) |
6da4cd46 | 133 | { |
6da4cd46 AA |
134 | if (!data) |
135 | return; | |
136 | ||
505d2ad2 SJ |
137 | list_del(&data->list); |
138 | kfree(data->name); | |
139 | kfree(data); | |
6da4cd46 AA |
140 | } |
141 | ||
505d2ad2 | 142 | static void quickstart_buttons_free(void) |
6da4cd46 | 143 | { |
3c92e38d | 144 | struct quickstart_button *b, *n; |
6da4cd46 | 145 | |
505d2ad2 SJ |
146 | list_for_each_entry_safe(b, n, &buttons, list) |
147 | quickstart_button_del(b); | |
6da4cd46 AA |
148 | } |
149 | ||
150 | /* ACPI Driver functions */ | |
151 | static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data) | |
152 | { | |
153 | struct quickstart_acpi *quickstart = data; | |
154 | ||
155 | if (!quickstart) | |
156 | return; | |
157 | ||
55e40369 SJ |
158 | switch (event) { |
159 | case QUICKSTART_EVENT_WAKE: | |
3c92e38d | 160 | pressed = quickstart->button; |
55e40369 SJ |
161 | break; |
162 | case QUICKSTART_EVENT_RUNTIME: | |
3c92e38d | 163 | input_report_key(quickstart_input, quickstart->button->id, 1); |
6da4cd46 | 164 | input_sync(quickstart_input); |
3c92e38d | 165 | input_report_key(quickstart_input, quickstart->button->id, 0); |
6da4cd46 | 166 | input_sync(quickstart_input); |
55e40369 SJ |
167 | break; |
168 | default: | |
74eabe4c | 169 | pr_err("Unexpected ACPI event notify (%u)\n", event); |
55e40369 | 170 | break; |
6da4cd46 | 171 | } |
6da4cd46 AA |
172 | } |
173 | ||
2ac16967 | 174 | static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart) |
6da4cd46 AA |
175 | { |
176 | acpi_status status; | |
177 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
2ac16967 | 178 | int ret = 0; |
6da4cd46 | 179 | |
5c9ed5be SJ |
180 | /* |
181 | * This returns a buffer telling the button usage ID, | |
182 | * and triggers pending notify events (The ones before booting). | |
183 | */ | |
184 | status = acpi_evaluate_object(quickstart->device->handle, "GHID", NULL, | |
185 | &buffer); | |
2ac16967 | 186 | if (ACPI_FAILURE(status)) { |
74eabe4c | 187 | pr_err("%s GHID method failed\n", quickstart->button->name); |
2ac16967 | 188 | return -EINVAL; |
6da4cd46 AA |
189 | } |
190 | ||
5c9ed5be SJ |
191 | /* |
192 | * <<The GHID method can return a BYTE, WORD, or DWORD. | |
6da4cd46 | 193 | * The value must be encoded in little-endian byte |
5c9ed5be SJ |
194 | * order (least significant byte first).>> |
195 | */ | |
2ac16967 SJ |
196 | switch (buffer.length) { |
197 | case 1: | |
3c92e38d | 198 | quickstart->button->id = *(uint8_t *)buffer.pointer; |
2ac16967 SJ |
199 | break; |
200 | case 2: | |
3c92e38d | 201 | quickstart->button->id = *(uint16_t *)buffer.pointer; |
2ac16967 SJ |
202 | break; |
203 | case 4: | |
3c92e38d | 204 | quickstart->button->id = *(uint32_t *)buffer.pointer; |
2ac16967 SJ |
205 | break; |
206 | case 8: | |
3c92e38d | 207 | quickstart->button->id = *(uint64_t *)buffer.pointer; |
2ac16967 SJ |
208 | break; |
209 | default: | |
5f01f7f3 SJ |
210 | pr_err("%s GHID method returned buffer of unexpected length %lu\n", |
211 | quickstart->button->name, | |
212 | (unsigned long)buffer.length); | |
2ac16967 SJ |
213 | ret = -EINVAL; |
214 | break; | |
215 | } | |
6da4cd46 AA |
216 | |
217 | kfree(buffer.pointer); | |
2ac16967 SJ |
218 | |
219 | return ret; | |
6da4cd46 AA |
220 | } |
221 | ||
ffe1c056 | 222 | static int quickstart_acpi_config(struct quickstart_acpi *quickstart) |
6da4cd46 | 223 | { |
ffe1c056 SJ |
224 | char *bid = acpi_device_bid(quickstart->device); |
225 | char *name; | |
6da4cd46 | 226 | |
ffe1c056 SJ |
227 | name = kmalloc(strlen(bid) + 1, GFP_KERNEL); |
228 | if (!name) | |
229 | return -ENOMEM; | |
230 | ||
505d2ad2 | 231 | /* Add new button to list */ |
3c92e38d SJ |
232 | quickstart->button = quickstart_buttons_add(); |
233 | if (!quickstart->button) { | |
ffe1c056 | 234 | kfree(name); |
505d2ad2 | 235 | return -ENOMEM; |
6da4cd46 | 236 | } |
ffe1c056 | 237 | |
3c92e38d SJ |
238 | quickstart->button->name = name; |
239 | strcpy(quickstart->button->name, bid); | |
6da4cd46 AA |
240 | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int quickstart_acpi_add(struct acpi_device *device) | |
245 | { | |
f27a5519 SJ |
246 | int ret; |
247 | acpi_status status; | |
248 | struct quickstart_acpi *quickstart; | |
6da4cd46 AA |
249 | |
250 | if (!device) | |
251 | return -EINVAL; | |
252 | ||
f27a5519 | 253 | quickstart = kzalloc(sizeof(*quickstart), GFP_KERNEL); |
6da4cd46 AA |
254 | if (!quickstart) |
255 | return -ENOMEM; | |
256 | ||
257 | quickstart->device = device; | |
f27a5519 | 258 | |
6da4cd46 AA |
259 | strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME); |
260 | strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS); | |
261 | device->driver_data = quickstart; | |
262 | ||
263 | /* Add button to list and initialize some stuff */ | |
ffe1c056 | 264 | ret = quickstart_acpi_config(quickstart); |
f27a5519 | 265 | if (ret < 0) |
6da4cd46 AA |
266 | goto fail_config; |
267 | ||
f27a5519 | 268 | status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY, |
6da4cd46 AA |
269 | quickstart_acpi_notify, |
270 | quickstart); | |
271 | if (ACPI_FAILURE(status)) { | |
74eabe4c | 272 | pr_err("Notify handler install error\n"); |
6da4cd46 AA |
273 | ret = -ENODEV; |
274 | goto fail_installnotify; | |
275 | } | |
276 | ||
f27a5519 SJ |
277 | ret = quickstart_acpi_ghid(quickstart); |
278 | if (ret < 0) | |
279 | goto fail_ghid; | |
6da4cd46 AA |
280 | |
281 | return 0; | |
282 | ||
f27a5519 SJ |
283 | fail_ghid: |
284 | acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY, | |
285 | quickstart_acpi_notify); | |
286 | ||
6da4cd46 | 287 | fail_installnotify: |
3c92e38d | 288 | quickstart_button_del(quickstart->button); |
6da4cd46 AA |
289 | |
290 | fail_config: | |
291 | ||
292 | kfree(quickstart); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
51fac838 | 297 | static int quickstart_acpi_remove(struct acpi_device *device) |
6da4cd46 | 298 | { |
60955f15 SJ |
299 | acpi_status status; |
300 | struct quickstart_acpi *quickstart; | |
6da4cd46 | 301 | |
60955f15 | 302 | if (!device) |
6da4cd46 AA |
303 | return -EINVAL; |
304 | ||
305 | quickstart = acpi_driver_data(device); | |
60955f15 SJ |
306 | if (!quickstart) |
307 | return -EINVAL; | |
6da4cd46 | 308 | |
5c9ed5be SJ |
309 | status = acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY, |
310 | quickstart_acpi_notify); | |
6da4cd46 | 311 | if (ACPI_FAILURE(status)) |
74eabe4c | 312 | pr_err("Error removing notify handler\n"); |
6da4cd46 | 313 | |
6da4cd46 AA |
314 | kfree(quickstart); |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
605926ef | 319 | /* Platform driver structs */ |
3b7cf04f GKH |
320 | static DEVICE_ATTR_RW(pressed_button); |
321 | static DEVICE_ATTR_RO(buttons); | |
605926ef SJ |
322 | static struct platform_device *pf_device; |
323 | static struct platform_driver pf_driver = { | |
324 | .driver = { | |
325 | .name = QUICKSTART_PF_DRIVER_NAME, | |
326 | .owner = THIS_MODULE, | |
327 | } | |
328 | }; | |
329 | ||
330 | static const struct acpi_device_id quickstart_device_ids[] = { | |
331 | {QUICKSTART_ACPI_HID, 0}, | |
332 | {"", 0}, | |
333 | }; | |
334 | ||
335 | static struct acpi_driver quickstart_acpi_driver = { | |
336 | .name = "quickstart", | |
337 | .class = QUICKSTART_ACPI_CLASS, | |
338 | .ids = quickstart_device_ids, | |
339 | .ops = { | |
340 | .add = quickstart_acpi_add, | |
341 | .remove = quickstart_acpi_remove, | |
342 | }, | |
343 | }; | |
344 | ||
6da4cd46 | 345 | /* Module functions */ |
6da4cd46 AA |
346 | static void quickstart_exit(void) |
347 | { | |
348 | input_unregister_device(quickstart_input); | |
6da4cd46 AA |
349 | |
350 | device_remove_file(&pf_device->dev, &dev_attr_pressed_button); | |
351 | device_remove_file(&pf_device->dev, &dev_attr_buttons); | |
352 | ||
353 | platform_device_unregister(pf_device); | |
354 | ||
355 | platform_driver_unregister(&pf_driver); | |
356 | ||
357 | acpi_bus_unregister_driver(&quickstart_acpi_driver); | |
358 | ||
505d2ad2 | 359 | quickstart_buttons_free(); |
6da4cd46 AA |
360 | } |
361 | ||
362 | static int __init quickstart_init_input(void) | |
363 | { | |
3c92e38d | 364 | struct quickstart_button *b; |
ebba26f4 | 365 | int ret; |
6da4cd46 AA |
366 | |
367 | quickstart_input = input_allocate_device(); | |
368 | ||
369 | if (!quickstart_input) | |
370 | return -ENOMEM; | |
371 | ||
372 | quickstart_input->name = "Quickstart ACPI Buttons"; | |
373 | quickstart_input->id.bustype = BUS_HOST; | |
374 | ||
505d2ad2 | 375 | list_for_each_entry(b, &buttons, list) { |
6da4cd46 | 376 | set_bit(EV_KEY, quickstart_input->evbit); |
505d2ad2 | 377 | set_bit(b->id, quickstart_input->keybit); |
6da4cd46 AA |
378 | } |
379 | ||
ebba26f4 DC |
380 | ret = input_register_device(quickstart_input); |
381 | if (ret) { | |
382 | input_free_device(quickstart_input); | |
383 | return ret; | |
384 | } | |
385 | ||
386 | return 0; | |
6da4cd46 AA |
387 | } |
388 | ||
389 | static int __init quickstart_init(void) | |
390 | { | |
391 | int ret; | |
6da4cd46 | 392 | |
6da4cd46 | 393 | /* ACPI driver register */ |
f0903863 DC |
394 | ret = acpi_bus_register_driver(&quickstart_acpi_driver); |
395 | if (ret) | |
396 | return ret; | |
6da4cd46 AA |
397 | |
398 | /* If existing bus with no devices */ | |
505d2ad2 | 399 | if (list_empty(&buttons)) { |
6da4cd46 AA |
400 | ret = -ENODEV; |
401 | goto fail_pfdrv_reg; | |
402 | } | |
403 | ||
404 | /* Platform driver register */ | |
405 | ret = platform_driver_register(&pf_driver); | |
406 | if (ret) | |
407 | goto fail_pfdrv_reg; | |
408 | ||
409 | /* Platform device register */ | |
410 | pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1); | |
411 | if (!pf_device) { | |
412 | ret = -ENOMEM; | |
413 | goto fail_pfdev_alloc; | |
414 | } | |
415 | ret = platform_device_add(pf_device); | |
416 | if (ret) | |
417 | goto fail_pfdev_add; | |
418 | ||
419 | /* Create device sysfs file */ | |
420 | ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button); | |
421 | if (ret) | |
422 | goto fail_dev_file; | |
423 | ||
424 | ret = device_create_file(&pf_device->dev, &dev_attr_buttons); | |
425 | if (ret) | |
426 | goto fail_dev_file2; | |
427 | ||
6da4cd46 AA |
428 | /* Input device */ |
429 | ret = quickstart_init_input(); | |
430 | if (ret) | |
431 | goto fail_input; | |
432 | ||
74eabe4c | 433 | pr_info("ACPI Direct App Launch ver %s\n", QUICKSTART_VERSION); |
6da4cd46 AA |
434 | |
435 | return 0; | |
436 | fail_input: | |
437 | device_remove_file(&pf_device->dev, &dev_attr_buttons); | |
438 | ||
439 | fail_dev_file2: | |
440 | device_remove_file(&pf_device->dev, &dev_attr_pressed_button); | |
441 | ||
442 | fail_dev_file: | |
443 | platform_device_del(pf_device); | |
444 | ||
445 | fail_pfdev_add: | |
446 | platform_device_put(pf_device); | |
447 | ||
448 | fail_pfdev_alloc: | |
449 | platform_driver_unregister(&pf_driver); | |
450 | ||
451 | fail_pfdrv_reg: | |
452 | acpi_bus_unregister_driver(&quickstart_acpi_driver); | |
453 | ||
454 | return ret; | |
455 | } | |
456 | ||
457 | module_init(quickstart_init); | |
458 | module_exit(quickstart_exit); |