Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 | /*
* quickstart.c - ACPI Direct App Launch driver
*
*
* Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
*
* Information gathered from disassembled dsdt and from here:
* <http://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define QUICKSTART_VERSION "1.04"
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_drivers.h>
#include <linux/platform_device.h>
#include <linux/input.h>
MODULE_AUTHOR("Angelo Arrifano");
MODULE_DESCRIPTION("ACPI Direct App Launch driver");
MODULE_LICENSE("GPL");
#define QUICKSTART_ACPI_DEVICE_NAME "quickstart"
#define QUICKSTART_ACPI_CLASS "quickstart"
#define QUICKSTART_ACPI_HID "PNP0C32"
#define QUICKSTART_PF_DRIVER_NAME "quickstart"
#define QUICKSTART_PF_DEVICE_NAME "quickstart"
/*
* There will be two events:
* 0x02 - A hot button was pressed while device was off/sleeping.
* 0x80 - A hot button was pressed while device was up.
*/
#define QUICKSTART_EVENT_WAKE 0x02
#define QUICKSTART_EVENT_RUNTIME 0x80
struct quickstart_button {
char *name;
unsigned int id;
struct list_head list;
};
struct quickstart_acpi {
struct acpi_device *device;
struct quickstart_button *button;
};
static LIST_HEAD(buttons);
static struct quickstart_button *pressed;
static struct input_dev *quickstart_input;
/* Platform driver functions */
static ssize_t quickstart_buttons_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct quickstart_button *b;
if (list_empty(&buttons))
return snprintf(buf, PAGE_SIZE, "none");
list_for_each_entry(b, &buttons, list) {
count += snprintf(buf + count, PAGE_SIZE - count, "%u\t%s\n",
b->id, b->name);
if (count >= PAGE_SIZE) {
count = PAGE_SIZE;
break;
}
}
return count;
}
static ssize_t quickstart_pressed_button_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%s\n",
(pressed ? pressed->name : "none"));
}
static ssize_t quickstart_pressed_button_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
if (count < 2)
return -EINVAL;
if (strncasecmp(buf, "none", 4) != 0)
return -EINVAL;
pressed = NULL;
return count;
}
/* Helper functions */
static struct quickstart_button *quickstart_buttons_add(void)
{
struct quickstart_button *b;
b = kzalloc(sizeof(*b), GFP_KERNEL);
if (!b)
return NULL;
list_add_tail(&b->list, &buttons);
return b;
}
static void quickstart_button_del(struct quickstart_button *data)
{
if (!data)
return;
list_del(&data->list);
kfree(data->name);
kfree(data);
}
static void quickstart_buttons_free(void)
{
struct quickstart_button *b, *n;
list_for_each_entry_safe(b, n, &buttons, list)
quickstart_button_del(b);
}
/* ACPI Driver functions */
static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
{
struct quickstart_acpi *quickstart = data;
if (!quickstart)
return;
switch (event) {
case QUICKSTART_EVENT_WAKE:
pressed = quickstart->button;
break;
case QUICKSTART_EVENT_RUNTIME:
input_report_key(quickstart_input, quickstart->button->id, 1);
input_sync(quickstart_input);
input_report_key(quickstart_input, quickstart->button->id, 0);
input_sync(quickstart_input);
break;
default:
pr_err("Unexpected ACPI event notify (%u)\n", event);
break;
}
}
static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
int ret = 0;
/*
* This returns a buffer telling the button usage ID,
* and triggers pending notify events (The ones before booting).
*/
status = acpi_evaluate_object(quickstart->device->handle, "GHID", NULL,
&buffer);
if (ACPI_FAILURE(status)) {
pr_err("%s GHID method failed\n", quickstart->button->name);
return -EINVAL;
}
/*
* <<The GHID method can return a BYTE, WORD, or DWORD.
* The value must be encoded in little-endian byte
* order (least significant byte first).>>
*/
switch (buffer.length) {
case 1:
quickstart->button->id = *(uint8_t *)buffer.pointer;
break;
case 2:
quickstart->button->id = *(uint16_t *)buffer.pointer;
break;
case 4:
quickstart->button->id = *(uint32_t *)buffer.pointer;
break;
case 8:
quickstart->button->id = *(uint64_t *)buffer.pointer;
break;
default:
pr_err("%s GHID method returned buffer of unexpected length %lu\n",
quickstart->button->name,
(unsigned long)buffer.length);
ret = -EINVAL;
break;
}
kfree(buffer.pointer);
return ret;
}
static int quickstart_acpi_config(struct quickstart_acpi *quickstart)
{
char *bid = acpi_device_bid(quickstart->device);
char *name;
name = kmalloc(strlen(bid) + 1, GFP_KERNEL);
if (!name)
return -ENOMEM;
/* Add new button to list */
quickstart->button = quickstart_buttons_add();
if (!quickstart->button) {
kfree(name);
return -ENOMEM;
}
quickstart->button->name = name;
strcpy(quickstart->button->name, bid);
return 0;
}
static int quickstart_acpi_add(struct acpi_device *device)
{
int ret;
acpi_status status;
struct quickstart_acpi *quickstart;
if (!device)
return -EINVAL;
quickstart = kzalloc(sizeof(*quickstart), GFP_KERNEL);
if (!quickstart)
return -ENOMEM;
quickstart->device = device;
strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
device->driver_data = quickstart;
/* Add button to list and initialize some stuff */
ret = quickstart_acpi_config(quickstart);
if (ret < 0)
goto fail_config;
status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify,
quickstart);
if (ACPI_FAILURE(status)) {
pr_err("Notify handler install error\n");
ret = -ENODEV;
goto fail_installnotify;
}
ret = quickstart_acpi_ghid(quickstart);
if (ret < 0)
goto fail_ghid;
return 0;
fail_ghid:
acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify);
fail_installnotify:
quickstart_button_del(quickstart->button);
fail_config:
kfree(quickstart);
return ret;
}
static int quickstart_acpi_remove(struct acpi_device *device, int type)
{
acpi_status status;
struct quickstart_acpi *quickstart;
if (!device)
return -EINVAL;
quickstart = acpi_driver_data(device);
if (!quickstart)
return -EINVAL;
status = acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
quickstart_acpi_notify);
if (ACPI_FAILURE(status))
pr_err("Error removing notify handler\n");
kfree(quickstart);
return 0;
}
/* Platform driver structs */
static DEVICE_ATTR(pressed_button, 0666, quickstart_pressed_button_show,
quickstart_pressed_button_store);
static DEVICE_ATTR(buttons, 0444, quickstart_buttons_show, NULL);
static struct platform_device *pf_device;
static struct platform_driver pf_driver = {
.driver = {
.name = QUICKSTART_PF_DRIVER_NAME,
.owner = THIS_MODULE,
}
};
static const struct acpi_device_id quickstart_device_ids[] = {
{QUICKSTART_ACPI_HID, 0},
{"", 0},
};
static struct acpi_driver quickstart_acpi_driver = {
.name = "quickstart",
.class = QUICKSTART_ACPI_CLASS,
.ids = quickstart_device_ids,
.ops = {
.add = quickstart_acpi_add,
.remove = quickstart_acpi_remove,
},
};
/* Module functions */
static void quickstart_exit(void)
{
input_unregister_device(quickstart_input);
device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
device_remove_file(&pf_device->dev, &dev_attr_buttons);
platform_device_unregister(pf_device);
platform_driver_unregister(&pf_driver);
acpi_bus_unregister_driver(&quickstart_acpi_driver);
quickstart_buttons_free();
}
static int __init quickstart_init_input(void)
{
struct quickstart_button *b;
int ret;
quickstart_input = input_allocate_device();
if (!quickstart_input)
return -ENOMEM;
quickstart_input->name = "Quickstart ACPI Buttons";
quickstart_input->id.bustype = BUS_HOST;
list_for_each_entry(b, &buttons, list) {
set_bit(EV_KEY, quickstart_input->evbit);
set_bit(b->id, quickstart_input->keybit);
}
ret = input_register_device(quickstart_input);
if (ret) {
input_free_device(quickstart_input);
return ret;
}
return 0;
}
static int __init quickstart_init(void)
{
int ret;
/* ACPI Check */
if (acpi_disabled)
return -ENODEV;
/* ACPI driver register */
ret = acpi_bus_register_driver(&quickstart_acpi_driver);
if (ret)
return ret;
/* If existing bus with no devices */
if (list_empty(&buttons)) {
ret = -ENODEV;
goto fail_pfdrv_reg;
}
/* Platform driver register */
ret = platform_driver_register(&pf_driver);
if (ret)
goto fail_pfdrv_reg;
/* Platform device register */
pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
if (!pf_device) {
ret = -ENOMEM;
goto fail_pfdev_alloc;
}
ret = platform_device_add(pf_device);
if (ret)
goto fail_pfdev_add;
/* Create device sysfs file */
ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
if (ret)
goto fail_dev_file;
ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
if (ret)
goto fail_dev_file2;
/* Input device */
ret = quickstart_init_input();
if (ret)
goto fail_input;
pr_info("ACPI Direct App Launch ver %s\n", QUICKSTART_VERSION);
return 0;
fail_input:
device_remove_file(&pf_device->dev, &dev_attr_buttons);
fail_dev_file2:
device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
fail_dev_file:
platform_device_del(pf_device);
fail_pfdev_add:
platform_device_put(pf_device);
fail_pfdev_alloc:
platform_driver_unregister(&pf_driver);
fail_pfdrv_reg:
acpi_bus_unregister_driver(&quickstart_acpi_driver);
return ret;
}
module_init(quickstart_init);
module_exit(quickstart_exit);
|