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1/*
2 * quickstart.c - ACPI Direct App Launch driver
3 *
4 *
5 * Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
6 *
7 * Information gathered from disassembled dsdt and from here:
8 * <http://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx>
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
26#define QUICKSTART_VERSION "1.04"
27
28#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/types.h>
34#include <linux/acpi.h>
35#include <linux/platform_device.h>
36#include <linux/input.h>
37
38MODULE_AUTHOR("Angelo Arrifano");
39MODULE_DESCRIPTION("ACPI Direct App Launch driver");
40MODULE_LICENSE("GPL");
41
42#define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
43#define QUICKSTART_ACPI_CLASS "quickstart"
44#define QUICKSTART_ACPI_HID "PNP0C32"
45
46#define QUICKSTART_PF_DRIVER_NAME "quickstart"
47#define QUICKSTART_PF_DEVICE_NAME "quickstart"
48
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
56
57struct quickstart_button {
58 char *name;
59 unsigned int id;
60 struct list_head list;
61};
62
63struct quickstart_acpi {
64 struct acpi_device *device;
65 struct quickstart_button *button;
66};
67
68static LIST_HEAD(buttons);
69static struct quickstart_button *pressed;
70
71static struct input_dev *quickstart_input;
72
73/* Platform driver functions */
74static ssize_t buttons_show(struct device *dev, struct device_attribute *attr,
75 char *buf)
76{
77 int count = 0;
78 struct quickstart_button *b;
79
80 if (list_empty(&buttons))
81 return snprintf(buf, PAGE_SIZE, "none");
82
83 list_for_each_entry(b, &buttons, list) {
84 count += snprintf(buf + count, PAGE_SIZE - count, "%u\t%s\n",
85 b->id, b->name);
86
87 if (count >= PAGE_SIZE) {
88 count = PAGE_SIZE;
89 break;
90 }
91 }
92
93 return count;
94}
95
96static ssize_t pressed_button_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
98{
99 return scnprintf(buf, PAGE_SIZE, "%s\n",
100 (pressed ? pressed->name : "none"));
101}
102
103
104static ssize_t pressed_button_store(struct device *dev,
105 struct device_attribute *attr,
106 const char *buf, size_t count)
107{
108 if (count < 2)
109 return -EINVAL;
110
111 if (strncasecmp(buf, "none", 4) != 0)
112 return -EINVAL;
113
114 pressed = NULL;
115 return count;
116}
117
118/* Helper functions */
119static struct quickstart_button *quickstart_buttons_add(void)
120{
121 struct quickstart_button *b;
122
123 b = kzalloc(sizeof(*b), GFP_KERNEL);
124 if (!b)
125 return NULL;
126
127 list_add_tail(&b->list, &buttons);
128
129 return b;
130}
131
132static void quickstart_button_del(struct quickstart_button *data)
133{
134 if (!data)
135 return;
136
137 list_del(&data->list);
138 kfree(data->name);
139 kfree(data);
140}
141
142static void quickstart_buttons_free(void)
143{
144 struct quickstart_button *b, *n;
145
146 list_for_each_entry_safe(b, n, &buttons, list)
147 quickstart_button_del(b);
148}
149
150/* ACPI Driver functions */
151static 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
158 switch (event) {
159 case QUICKSTART_EVENT_WAKE:
160 pressed = quickstart->button;
161 break;
162 case QUICKSTART_EVENT_RUNTIME:
163 input_report_key(quickstart_input, quickstart->button->id, 1);
164 input_sync(quickstart_input);
165 input_report_key(quickstart_input, quickstart->button->id, 0);
166 input_sync(quickstart_input);
167 break;
168 default:
169 pr_err("Unexpected ACPI event notify (%u)\n", event);
170 break;
171 }
172}
173
174static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
175{
176 acpi_status status;
177 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
178 int ret = 0;
179
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);
186 if (ACPI_FAILURE(status)) {
187 pr_err("%s GHID method failed\n", quickstart->button->name);
188 return -EINVAL;
189 }
190
191 /*
192 * <<The GHID method can return a BYTE, WORD, or DWORD.
193 * The value must be encoded in little-endian byte
194 * order (least significant byte first).>>
195 */
196 switch (buffer.length) {
197 case 1:
198 quickstart->button->id = *(uint8_t *)buffer.pointer;
199 break;
200 case 2:
201 quickstart->button->id = *(uint16_t *)buffer.pointer;
202 break;
203 case 4:
204 quickstart->button->id = *(uint32_t *)buffer.pointer;
205 break;
206 case 8:
207 quickstart->button->id = *(uint64_t *)buffer.pointer;
208 break;
209 default:
210 pr_err("%s GHID method returned buffer of unexpected length %lu\n",
211 quickstart->button->name,
212 (unsigned long)buffer.length);
213 ret = -EINVAL;
214 break;
215 }
216
217 kfree(buffer.pointer);
218
219 return ret;
220}
221
222static int quickstart_acpi_config(struct quickstart_acpi *quickstart)
223{
224 char *bid = acpi_device_bid(quickstart->device);
225 char *name;
226
227 name = kmalloc(strlen(bid) + 1, GFP_KERNEL);
228 if (!name)
229 return -ENOMEM;
230
231 /* Add new button to list */
232 quickstart->button = quickstart_buttons_add();
233 if (!quickstart->button) {
234 kfree(name);
235 return -ENOMEM;
236 }
237
238 quickstart->button->name = name;
239 strcpy(quickstart->button->name, bid);
240
241 return 0;
242}
243
244static int quickstart_acpi_add(struct acpi_device *device)
245{
246 int ret;
247 acpi_status status;
248 struct quickstart_acpi *quickstart;
249
250 if (!device)
251 return -EINVAL;
252
253 quickstart = kzalloc(sizeof(*quickstart), GFP_KERNEL);
254 if (!quickstart)
255 return -ENOMEM;
256
257 quickstart->device = device;
258
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 */
264 ret = quickstart_acpi_config(quickstart);
265 if (ret < 0)
266 goto fail_config;
267
268 status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY,
269 quickstart_acpi_notify,
270 quickstart);
271 if (ACPI_FAILURE(status)) {
272 pr_err("Notify handler install error\n");
273 ret = -ENODEV;
274 goto fail_installnotify;
275 }
276
277 ret = quickstart_acpi_ghid(quickstart);
278 if (ret < 0)
279 goto fail_ghid;
280
281 return 0;
282
283fail_ghid:
284 acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
285 quickstart_acpi_notify);
286
287fail_installnotify:
288 quickstart_button_del(quickstart->button);
289
290fail_config:
291
292 kfree(quickstart);
293
294 return ret;
295}
296
297static int quickstart_acpi_remove(struct acpi_device *device)
298{
299 acpi_status status;
300 struct quickstart_acpi *quickstart;
301
302 if (!device)
303 return -EINVAL;
304
305 quickstart = acpi_driver_data(device);
306 if (!quickstart)
307 return -EINVAL;
308
309 status = acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
310 quickstart_acpi_notify);
311 if (ACPI_FAILURE(status))
312 pr_err("Error removing notify handler\n");
313
314 kfree(quickstart);
315
316 return 0;
317}
318
319/* Platform driver structs */
320static DEVICE_ATTR_RW(pressed_button);
321static DEVICE_ATTR_RO(buttons);
322static struct platform_device *pf_device;
323static struct platform_driver pf_driver = {
324 .driver = {
325 .name = QUICKSTART_PF_DRIVER_NAME,
326 .owner = THIS_MODULE,
327 }
328};
329
330static const struct acpi_device_id quickstart_device_ids[] = {
331 {QUICKSTART_ACPI_HID, 0},
332 {"", 0},
333};
334
335static 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
345/* Module functions */
346static void quickstart_exit(void)
347{
348 input_unregister_device(quickstart_input);
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
359 quickstart_buttons_free();
360}
361
362static int __init quickstart_init_input(void)
363{
364 struct quickstart_button *b;
365 int ret;
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
375 list_for_each_entry(b, &buttons, list) {
376 set_bit(EV_KEY, quickstart_input->evbit);
377 set_bit(b->id, quickstart_input->keybit);
378 }
379
380 ret = input_register_device(quickstart_input);
381 if (ret) {
382 input_free_device(quickstart_input);
383 return ret;
384 }
385
386 return 0;
387}
388
389static int __init quickstart_init(void)
390{
391 int ret;
392
393 /* ACPI driver register */
394 ret = acpi_bus_register_driver(&quickstart_acpi_driver);
395 if (ret)
396 return ret;
397
398 /* If existing bus with no devices */
399 if (list_empty(&buttons)) {
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
428 /* Input device */
429 ret = quickstart_init_input();
430 if (ret)
431 goto fail_input;
432
433 pr_info("ACPI Direct App Launch ver %s\n", QUICKSTART_VERSION);
434
435 return 0;
436fail_input:
437 device_remove_file(&pf_device->dev, &dev_attr_buttons);
438
439fail_dev_file2:
440 device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
441
442fail_dev_file:
443 platform_device_del(pf_device);
444
445fail_pfdev_add:
446 platform_device_put(pf_device);
447
448fail_pfdev_alloc:
449 platform_driver_unregister(&pf_driver);
450
451fail_pfdrv_reg:
452 acpi_bus_unregister_driver(&quickstart_acpi_driver);
453
454 return ret;
455}
456
457module_init(quickstart_init);
458module_exit(quickstart_exit);