2 * quickstart.c - ACPI Direct App Launch driver
5 * Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
7 * Information gathered from disassebled dsdt and from here:
8 * "http://download.microsoft.com/download/9/c/5/
9 * 9c5b2167-8017-4bae-9fde-d599bac8184a/DirAppLaunch_Vista.doc"
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #define QUICKSTART_VERSION "1.03"
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <acpi/acpi_drivers.h>
34 #include <linux/platform_device.h>
35 #include <linux/input.h>
37 MODULE_AUTHOR("Angelo Arrifano");
38 MODULE_DESCRIPTION("ACPI Direct App Launch driver");
39 MODULE_LICENSE("GPL");
41 #define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
42 #define QUICKSTART_ACPI_CLASS "quickstart"
43 #define QUICKSTART_ACPI_HID "PNP0C32"
45 #define QUICKSTART_PF_DRIVER_NAME "quickstart"
46 #define QUICKSTART_PF_DEVICE_NAME "quickstart"
47 #define QUICKSTART_PF_DEVATTR_NAME "pressed_button"
49 #define QUICKSTART_MAX_BTN_NAME_LEN 16
51 /* There will be two events:
52 * 0x02 - A hot button was pressed while device was off/sleeping.
53 * 0x80 - A hot button was pressed while device was up. */
54 #define QUICKSTART_EVENT_WAKE 0x02
55 #define QUICKSTART_EVENT_RUNTIME 0x80
57 struct quickstart_btn {
60 struct quickstart_btn *next;
63 static struct quickstart_driver_data {
64 struct quickstart_btn *btn_lst;
65 struct quickstart_btn *pressed;
68 /* ACPI driver Structs */
69 struct quickstart_acpi {
70 struct acpi_device *device;
71 struct quickstart_btn *btn;
73 static int quickstart_acpi_add(struct acpi_device *device);
74 static int quickstart_acpi_remove(struct acpi_device *device, int type);
75 static const struct acpi_device_id quickstart_device_ids[] = {
76 {QUICKSTART_ACPI_HID, 0},
80 static struct acpi_driver quickstart_acpi_driver = {
82 .class = QUICKSTART_ACPI_CLASS,
83 .ids = quickstart_device_ids,
85 .add = quickstart_acpi_add,
86 .remove = quickstart_acpi_remove,
90 /* Input device structs */
91 struct input_dev *quickstart_input;
93 /* Platform driver structs */
94 static ssize_t buttons_show(struct device *dev,
95 struct device_attribute *attr,
97 static ssize_t pressed_button_show(struct device *dev,
98 struct device_attribute *attr,
100 static ssize_t pressed_button_store(struct device *dev,
101 struct device_attribute *attr,
104 static DEVICE_ATTR(pressed_button, 0666, pressed_button_show,
105 pressed_button_store);
106 static DEVICE_ATTR(buttons, 0444, buttons_show, NULL);
107 static struct platform_device *pf_device;
108 static struct platform_driver pf_driver = {
110 .name = QUICKSTART_PF_DRIVER_NAME,
111 .owner = THIS_MODULE,
116 * Platform driver functions
118 static ssize_t buttons_show(struct device *dev,
119 struct device_attribute *attr,
123 struct quickstart_btn *ptr = quickstart_data.btn_lst;
126 return snprintf(buf, PAGE_SIZE, "none");
128 while (ptr && (count < PAGE_SIZE)) {
130 count += snprintf(buf + count,
132 "%d\t%s\n", ptr->id, ptr->name);
140 static ssize_t pressed_button_show(struct device *dev,
141 struct device_attribute *attr,
144 return snprintf(buf, PAGE_SIZE, "%s\n",
145 (quickstart_data.pressed?quickstart_data.pressed->name:"none"));
149 static ssize_t pressed_button_store(struct device *dev,
150 struct device_attribute *attr,
151 const char *buf, size_t count)
156 if (strncasecmp(buf, "none", 4) != 0)
159 quickstart_data.pressed = NULL;
163 /* Hotstart Helper functions */
164 static int quickstart_btnlst_add(struct quickstart_btn **data)
166 struct quickstart_btn **ptr = &quickstart_data.btn_lst;
169 ptr = &((*ptr)->next);
171 *ptr = kzalloc(sizeof(struct quickstart_btn), GFP_KERNEL);
181 static void quickstart_btnlst_del(struct quickstart_btn *data)
183 struct quickstart_btn **ptr = &quickstart_data.btn_lst;
194 ptr = &((*ptr)->next);
200 static void quickstart_btnlst_free(void)
202 struct quickstart_btn *ptr = quickstart_data.btn_lst;
203 struct quickstart_btn *lptr = NULL;
215 /* ACPI Driver functions */
216 static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
218 struct quickstart_acpi *quickstart = data;
223 if (event == QUICKSTART_EVENT_WAKE)
224 quickstart_data.pressed = quickstart->btn;
225 else if (event == QUICKSTART_EVENT_RUNTIME) {
226 input_report_key(quickstart_input, quickstart->btn->id, 1);
227 input_sync(quickstart_input);
228 input_report_key(quickstart_input, quickstart->btn->id, 0);
229 input_sync(quickstart_input);
234 static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
237 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
238 uint32_t usageid = 0;
243 /* This returns a buffer telling the button usage ID,
244 * and triggers pending notify events (The ones before booting). */
245 status = acpi_evaluate_object(quickstart->device->handle,
246 "GHID", NULL, &buffer);
247 if (ACPI_FAILURE(status) || !buffer.pointer) {
248 printk(KERN_ERR "quickstart: %s GHID method failed.\n",
249 quickstart->btn->name);
253 if (buffer.length < 8)
256 /* <<The GHID method can return a BYTE, WORD, or DWORD.
257 * The value must be encoded in little-endian byte
258 * order (least significant byte first).>> */
259 usageid = *((uint32_t *)(buffer.pointer + (buffer.length - 8)));
260 quickstart->btn->id = usageid;
262 kfree(buffer.pointer);
265 static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid)
267 int len = strlen(bid);
270 /* Add button to list */
271 ret = quickstart_btnlst_add(&quickstart->btn);
275 quickstart->btn->name = kzalloc(len + 1, GFP_KERNEL);
276 if (!quickstart->btn->name) {
277 quickstart_btnlst_free();
280 strcpy(quickstart->btn->name, bid);
285 static int quickstart_acpi_add(struct acpi_device *device)
288 acpi_status status = AE_OK;
289 struct quickstart_acpi *quickstart = NULL;
294 quickstart = kzalloc(sizeof(struct quickstart_acpi), GFP_KERNEL);
298 quickstart->device = device;
299 strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
300 strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
301 device->driver_data = quickstart;
303 /* Add button to list and initialize some stuff */
304 ret = quickstart_acpi_config(quickstart, acpi_device_bid(device));
308 status = acpi_install_notify_handler(device->handle,
310 quickstart_acpi_notify,
312 if (ACPI_FAILURE(status)) {
313 printk(KERN_ERR "quickstart: Notify handler install error\n");
315 goto fail_installnotify;
318 quickstart_acpi_ghid(quickstart);
323 quickstart_btnlst_del(quickstart->btn);
332 static int quickstart_acpi_remove(struct acpi_device *device, int type)
334 acpi_status status = 0;
335 struct quickstart_acpi *quickstart = NULL;
337 if (!device || !acpi_driver_data(device))
340 quickstart = acpi_driver_data(device);
342 status = acpi_remove_notify_handler(device->handle,
344 quickstart_acpi_notify);
345 if (ACPI_FAILURE(status))
346 printk(KERN_ERR "quickstart: Error removing notify handler\n");
354 /* Module functions */
356 static void quickstart_exit(void)
358 input_unregister_device(quickstart_input);
359 input_free_device(quickstart_input);
361 device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
362 device_remove_file(&pf_device->dev, &dev_attr_buttons);
364 platform_device_unregister(pf_device);
366 platform_driver_unregister(&pf_driver);
368 acpi_bus_unregister_driver(&quickstart_acpi_driver);
370 quickstart_btnlst_free();
375 static int __init quickstart_init_input(void)
377 struct quickstart_btn **ptr = &quickstart_data.btn_lst;
380 quickstart_input = input_allocate_device();
382 if (!quickstart_input)
385 quickstart_input->name = "Quickstart ACPI Buttons";
386 quickstart_input->id.bustype = BUS_HOST;
390 set_bit(EV_KEY, quickstart_input->evbit);
391 set_bit((*ptr)->id, quickstart_input->keybit);
392 ptr = &((*ptr)->next);
395 return input_register_device(quickstart_input);
398 static int __init quickstart_init(void)
401 acpi_status status = 0;
407 /* ACPI driver register */
408 status = acpi_bus_register_driver(&quickstart_acpi_driver);
412 /* If existing bus with no devices */
413 if (!quickstart_data.btn_lst) {
418 /* Platform driver register */
419 ret = platform_driver_register(&pf_driver);
423 /* Platform device register */
424 pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
427 goto fail_pfdev_alloc;
429 ret = platform_device_add(pf_device);
433 /* Create device sysfs file */
434 ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
438 ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
444 ret = quickstart_init_input();
448 printk(KERN_INFO "quickstart: ACPI Direct App Launch ver %s\n",
453 device_remove_file(&pf_device->dev, &dev_attr_buttons);
456 device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
459 platform_device_del(pf_device);
462 platform_device_put(pf_device);
465 platform_driver_unregister(&pf_driver);
468 acpi_bus_unregister_driver(&quickstart_acpi_driver);
473 module_init(quickstart_init);
474 module_exit(quickstart_exit);