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://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx>
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.
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.
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
26 #define QUICKSTART_VERSION "1.03"
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <acpi/acpi_drivers.h>
33 #include <linux/platform_device.h>
34 #include <linux/input.h>
36 MODULE_AUTHOR("Angelo Arrifano");
37 MODULE_DESCRIPTION("ACPI Direct App Launch driver");
38 MODULE_LICENSE("GPL");
40 #define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
41 #define QUICKSTART_ACPI_CLASS "quickstart"
42 #define QUICKSTART_ACPI_HID "PNP0C32"
44 #define QUICKSTART_PF_DRIVER_NAME "quickstart"
45 #define QUICKSTART_PF_DEVICE_NAME "quickstart"
46 #define QUICKSTART_PF_DEVATTR_NAME "pressed_button"
48 #define QUICKSTART_MAX_BTN_NAME_LEN 16
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 #define QUICKSTART_EVENT_WAKE 0x02
54 #define QUICKSTART_EVENT_RUNTIME 0x80
56 struct quickstart_btn
{
59 struct quickstart_btn
*next
;
62 static struct quickstart_driver_data
{
63 struct quickstart_btn
*btn_lst
;
64 struct quickstart_btn
*pressed
;
67 /* ACPI driver Structs */
68 struct quickstart_acpi
{
69 struct acpi_device
*device
;
70 struct quickstart_btn
*btn
;
72 static int quickstart_acpi_add(struct acpi_device
*device
);
73 static int quickstart_acpi_remove(struct acpi_device
*device
, int type
);
74 static const struct acpi_device_id quickstart_device_ids
[] = {
75 {QUICKSTART_ACPI_HID
, 0},
79 static struct acpi_driver quickstart_acpi_driver
= {
81 .class = QUICKSTART_ACPI_CLASS
,
82 .ids
= quickstart_device_ids
,
84 .add
= quickstart_acpi_add
,
85 .remove
= quickstart_acpi_remove
,
89 /* Input device structs */
90 struct input_dev
*quickstart_input
;
92 /* Platform driver structs */
93 static ssize_t
buttons_show(struct device
*dev
,
94 struct device_attribute
*attr
,
96 static ssize_t
pressed_button_show(struct device
*dev
,
97 struct device_attribute
*attr
,
99 static ssize_t
pressed_button_store(struct device
*dev
,
100 struct device_attribute
*attr
,
103 static DEVICE_ATTR(pressed_button
, 0666, pressed_button_show
,
104 pressed_button_store
);
105 static DEVICE_ATTR(buttons
, 0444, buttons_show
, NULL
);
106 static struct platform_device
*pf_device
;
107 static struct platform_driver pf_driver
= {
109 .name
= QUICKSTART_PF_DRIVER_NAME
,
110 .owner
= THIS_MODULE
,
115 * Platform driver functions
117 static ssize_t
buttons_show(struct device
*dev
,
118 struct device_attribute
*attr
,
122 struct quickstart_btn
*ptr
= quickstart_data
.btn_lst
;
125 return snprintf(buf
, PAGE_SIZE
, "none");
127 while (ptr
&& (count
< PAGE_SIZE
)) {
129 count
+= snprintf(buf
+ count
,
131 "%d\t%s\n", ptr
->id
, ptr
->name
);
139 static ssize_t
pressed_button_show(struct device
*dev
,
140 struct device_attribute
*attr
,
143 return snprintf(buf
, PAGE_SIZE
, "%s\n",
144 (quickstart_data
.pressed
?quickstart_data
.pressed
->name
:"none"));
148 static ssize_t
pressed_button_store(struct device
*dev
,
149 struct device_attribute
*attr
,
150 const char *buf
, size_t count
)
155 if (strncasecmp(buf
, "none", 4) != 0)
158 quickstart_data
.pressed
= NULL
;
162 /* Hotstart Helper functions */
163 static int quickstart_btnlst_add(struct quickstart_btn
**data
)
165 struct quickstart_btn
**ptr
= &quickstart_data
.btn_lst
;
168 ptr
= &((*ptr
)->next
);
170 *ptr
= kzalloc(sizeof(struct quickstart_btn
), GFP_KERNEL
);
180 static void quickstart_btnlst_del(struct quickstart_btn
*data
)
182 struct quickstart_btn
**ptr
= &quickstart_data
.btn_lst
;
193 ptr
= &((*ptr
)->next
);
199 static void quickstart_btnlst_free(void)
201 struct quickstart_btn
*ptr
= quickstart_data
.btn_lst
;
202 struct quickstart_btn
*lptr
= NULL
;
214 /* ACPI Driver functions */
215 static void quickstart_acpi_notify(acpi_handle handle
, u32 event
, void *data
)
217 struct quickstart_acpi
*quickstart
= data
;
222 if (event
== QUICKSTART_EVENT_WAKE
)
223 quickstart_data
.pressed
= quickstart
->btn
;
224 else if (event
== QUICKSTART_EVENT_RUNTIME
) {
225 input_report_key(quickstart_input
, quickstart
->btn
->id
, 1);
226 input_sync(quickstart_input
);
227 input_report_key(quickstart_input
, quickstart
->btn
->id
, 0);
228 input_sync(quickstart_input
);
233 static void quickstart_acpi_ghid(struct quickstart_acpi
*quickstart
)
236 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
237 uint32_t usageid
= 0;
242 /* This returns a buffer telling the button usage ID,
243 * and triggers pending notify events (The ones before booting). */
244 status
= acpi_evaluate_object(quickstart
->device
->handle
,
245 "GHID", NULL
, &buffer
);
246 if (ACPI_FAILURE(status
) || !buffer
.pointer
) {
247 printk(KERN_ERR
"quickstart: %s GHID method failed.\n",
248 quickstart
->btn
->name
);
252 if (buffer
.length
< 8)
255 /* <<The GHID method can return a BYTE, WORD, or DWORD.
256 * The value must be encoded in little-endian byte
257 * order (least significant byte first).>> */
258 usageid
= *((uint32_t *)(buffer
.pointer
+ (buffer
.length
- 8)));
259 quickstart
->btn
->id
= usageid
;
261 kfree(buffer
.pointer
);
264 static int quickstart_acpi_config(struct quickstart_acpi
*quickstart
, char *bid
)
266 int len
= strlen(bid
);
269 /* Add button to list */
270 ret
= quickstart_btnlst_add(&quickstart
->btn
);
274 quickstart
->btn
->name
= kzalloc(len
+ 1, GFP_KERNEL
);
275 if (!quickstart
->btn
->name
) {
276 quickstart_btnlst_free();
279 strcpy(quickstart
->btn
->name
, bid
);
284 static int quickstart_acpi_add(struct acpi_device
*device
)
287 acpi_status status
= AE_OK
;
288 struct quickstart_acpi
*quickstart
= NULL
;
293 quickstart
= kzalloc(sizeof(struct quickstart_acpi
), GFP_KERNEL
);
297 quickstart
->device
= device
;
298 strcpy(acpi_device_name(device
), QUICKSTART_ACPI_DEVICE_NAME
);
299 strcpy(acpi_device_class(device
), QUICKSTART_ACPI_CLASS
);
300 device
->driver_data
= quickstart
;
302 /* Add button to list and initialize some stuff */
303 ret
= quickstart_acpi_config(quickstart
, acpi_device_bid(device
));
307 status
= acpi_install_notify_handler(device
->handle
,
309 quickstart_acpi_notify
,
311 if (ACPI_FAILURE(status
)) {
312 printk(KERN_ERR
"quickstart: Notify handler install error\n");
314 goto fail_installnotify
;
317 quickstart_acpi_ghid(quickstart
);
322 quickstart_btnlst_del(quickstart
->btn
);
331 static int quickstart_acpi_remove(struct acpi_device
*device
, int type
)
333 acpi_status status
= 0;
334 struct quickstart_acpi
*quickstart
= NULL
;
336 if (!device
|| !acpi_driver_data(device
))
339 quickstart
= acpi_driver_data(device
);
341 status
= acpi_remove_notify_handler(device
->handle
,
343 quickstart_acpi_notify
);
344 if (ACPI_FAILURE(status
))
345 printk(KERN_ERR
"quickstart: Error removing notify handler\n");
353 /* Module functions */
355 static void quickstart_exit(void)
357 input_unregister_device(quickstart_input
);
358 input_free_device(quickstart_input
);
360 device_remove_file(&pf_device
->dev
, &dev_attr_pressed_button
);
361 device_remove_file(&pf_device
->dev
, &dev_attr_buttons
);
363 platform_device_unregister(pf_device
);
365 platform_driver_unregister(&pf_driver
);
367 acpi_bus_unregister_driver(&quickstart_acpi_driver
);
369 quickstart_btnlst_free();
374 static int __init
quickstart_init_input(void)
376 struct quickstart_btn
**ptr
= &quickstart_data
.btn_lst
;
379 quickstart_input
= input_allocate_device();
381 if (!quickstart_input
)
384 quickstart_input
->name
= "Quickstart ACPI Buttons";
385 quickstart_input
->id
.bustype
= BUS_HOST
;
389 set_bit(EV_KEY
, quickstart_input
->evbit
);
390 set_bit((*ptr
)->id
, quickstart_input
->keybit
);
391 ptr
= &((*ptr
)->next
);
394 return input_register_device(quickstart_input
);
397 static int __init
quickstart_init(void)
405 /* ACPI driver register */
406 ret
= acpi_bus_register_driver(&quickstart_acpi_driver
);
410 /* If existing bus with no devices */
411 if (!quickstart_data
.btn_lst
) {
416 /* Platform driver register */
417 ret
= platform_driver_register(&pf_driver
);
421 /* Platform device register */
422 pf_device
= platform_device_alloc(QUICKSTART_PF_DEVICE_NAME
, -1);
425 goto fail_pfdev_alloc
;
427 ret
= platform_device_add(pf_device
);
431 /* Create device sysfs file */
432 ret
= device_create_file(&pf_device
->dev
, &dev_attr_pressed_button
);
436 ret
= device_create_file(&pf_device
->dev
, &dev_attr_buttons
);
442 ret
= quickstart_init_input();
446 printk(KERN_INFO
"quickstart: ACPI Direct App Launch ver %s\n",
451 device_remove_file(&pf_device
->dev
, &dev_attr_buttons
);
454 device_remove_file(&pf_device
->dev
, &dev_attr_pressed_button
);
457 platform_device_del(pf_device
);
460 platform_device_put(pf_device
);
463 platform_driver_unregister(&pf_driver
);
466 acpi_bus_unregister_driver(&quickstart_acpi_driver
);
471 module_init(quickstart_init
);
472 module_exit(quickstart_exit
);