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
);