drivers/staging/quickstart/quickstart.c

   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 disassebled 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 "1.03"
  27
  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>
  35
  36 MODULE_AUTHOR("Angelo Arrifano");
  37 MODULE_DESCRIPTION("ACPI Direct App Launch driver");
  38 MODULE_LICENSE("GPL");
  39
  40 #define QUICKSTART_ACPI_DEVICE_NAME   "quickstart"
  41 #define QUICKSTART_ACPI_CLASS         "quickstart"
  42 #define QUICKSTART_ACPI_HID           "PNP0C32"
  43
  44 #define QUICKSTART_PF_DRIVER_NAME     "quickstart"
  45 #define QUICKSTART_PF_DEVICE_NAME     "quickstart"
  46 #define QUICKSTART_PF_DEVATTR_NAME    "pressed_button"
  47
  48 #define QUICKSTART_MAX_BTN_NAME_LEN   16
  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 #define QUICKSTART_EVENT_WAKE         0x02
  54 #define QUICKSTART_EVENT_RUNTIME      0x80
  55
  56 struct quickstart_btn {
  57         char *name;
  58         unsigned int id;
  59         struct quickstart_btn *next;
  60 };
  61
  62 static struct quickstart_driver_data {
  63         struct quickstart_btn *btn_lst;
  64         struct quickstart_btn *pressed;
  65 } quickstart_data;
  66
  67 /* ACPI driver Structs */
  68 struct quickstart_acpi {
  69         struct acpi_device *device;
  70         struct quickstart_btn *btn;
  71 };
  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},
  76         {"", 0},
  77 };
  78
  79 static struct acpi_driver quickstart_acpi_driver = {
  80         .name = "quickstart",
  81         .class = QUICKSTART_ACPI_CLASS,
  82         .ids = quickstart_device_ids,
  83         .ops = {
  84                         .add = quickstart_acpi_add,
  85                         .remove = quickstart_acpi_remove,
  86                 },
  87 };
  88
  89 /* Input device structs */
  90 struct input_dev *quickstart_input;
  91
  92 /* Platform driver structs */
  93 static ssize_t buttons_show(struct device *dev,
  94                                         struct device_attribute *attr,
  95                                         char *buf);
  96 static ssize_t pressed_button_show(struct device *dev,
  97                                         struct device_attribute *attr,
  98                                         char *buf);
  99 static ssize_t pressed_button_store(struct device *dev,
 100                                         struct device_attribute *attr,
 101                                          const char *buf,
 102                                          size_t count);
 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 = {
 108         .driver = {
 109                 .name = QUICKSTART_PF_DRIVER_NAME,
 110                 .owner = THIS_MODULE,
 111         }
 112 };
 113
 114 /*
 115  * Platform driver functions
 116  */
 117 static ssize_t buttons_show(struct device *dev,
 118                                          struct device_attribute *attr,
 119                                          char *buf)
 120 {
 121         int count = 0;
 122         struct quickstart_btn *ptr = quickstart_data.btn_lst;
 123
 124         if (!ptr)
 125                 return snprintf(buf, PAGE_SIZE, "none");
 126
 127         while (ptr && (count < PAGE_SIZE)) {
 128                 if (ptr->name) {
 129                         count += snprintf(buf + count,
 130                                         PAGE_SIZE - count,
 131                                         "%d\t%s\n", ptr->id, ptr->name);
 132                 }
 133                 ptr = ptr->next;
 134         }
 135
 136         return count;
 137 }
 138
 139 static ssize_t pressed_button_show(struct device *dev,
 140                                         struct device_attribute *attr,
 141                                         char *buf)
 142 {
 143         return snprintf(buf, PAGE_SIZE, "%s\n",
 144                 (quickstart_data.pressed?quickstart_data.pressed->name:"none"));
 145 }
 146
 147
 148 static ssize_t pressed_button_store(struct device *dev,
 149                                          struct device_attribute *attr,
 150                                          const char *buf, size_t count)
 151 {
 152         if (count < 2)
 153                 return -EINVAL;
 154
 155         if (strncasecmp(buf, "none", 4) != 0)
 156                 return -EINVAL;
 157
 158         quickstart_data.pressed = NULL;
 159         return count;
 160 }
 161
 162 /* Hotstart Helper functions */
 163 static int quickstart_btnlst_add(struct quickstart_btn **data)
 164 {
 165         struct quickstart_btn **ptr = &quickstart_data.btn_lst;
 166
 167         while (*ptr)
 168                 ptr = &((*ptr)->next);
 169
 170         *ptr = kzalloc(sizeof(struct quickstart_btn), GFP_KERNEL);
 171         if (!*ptr) {
 172                 *data = NULL;
 173                 return -ENOMEM;
 174         }
 175         *data = *ptr;
 176
 177         return 0;
 178 }
 179
 180 static void quickstart_btnlst_del(struct quickstart_btn *data)
 181 {
 182         struct quickstart_btn **ptr = &quickstart_data.btn_lst;
 183
 184         if (!data)
 185                 return;
 186
 187         while (*ptr) {
 188                 if (*ptr == data) {
 189                         *ptr = (*ptr)->next;
 190                         kfree(data);
 191                         return;
 192                 }
 193                 ptr = &((*ptr)->next);
 194         }
 195
 196         return;
 197 }
 198
 199 static void quickstart_btnlst_free(void)
 200 {
 201         struct quickstart_btn *ptr = quickstart_data.btn_lst;
 202         struct quickstart_btn *lptr = NULL;
 203
 204         while (ptr) {
 205                 lptr = ptr;
 206                 ptr = ptr->next;
 207                 kfree(lptr->name);
 208                 kfree(lptr);
 209         }
 210
 211         return;
 212 }
 213
 214 /* ACPI Driver functions */
 215 static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
 216 {
 217         struct quickstart_acpi *quickstart = data;
 218
 219         if (!quickstart)
 220                 return;
 221
 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);
 229         }
 230         return;
 231 }
 232
 233 static void quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
 234 {
 235         acpi_status status;
 236         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 237         uint32_t usageid = 0;
 238
 239         if (!quickstart)
 240                 return;
 241
 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);
 249                 return;
 250         }
 251
 252         if (buffer.length < 8)
 253                 return;
 254
 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;
 260
 261         kfree(buffer.pointer);
 262 }
 263
 264 static int quickstart_acpi_config(struct quickstart_acpi *quickstart, char *bid)
 265 {
 266         int len = strlen(bid);
 267         int ret;
 268
 269         /* Add button to list */
 270         ret = quickstart_btnlst_add(&quickstart->btn);
 271         if (ret)
 272                 return ret;
 273
 274         quickstart->btn->name = kzalloc(len + 1, GFP_KERNEL);
 275         if (!quickstart->btn->name) {
 276                 quickstart_btnlst_free();
 277                 return -ENOMEM;
 278         }
 279         strcpy(quickstart->btn->name, bid);
 280
 281         return 0;
 282 }
 283
 284 static int quickstart_acpi_add(struct acpi_device *device)
 285 {
 286         int ret = 0;
 287         acpi_status status = AE_OK;
 288         struct quickstart_acpi *quickstart = NULL;
 289
 290         if (!device)
 291                 return -EINVAL;
 292
 293         quickstart = kzalloc(sizeof(struct quickstart_acpi), GFP_KERNEL);
 294         if (!quickstart)
 295                 return -ENOMEM;
 296
 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;
 301
 302         /* Add button to list and initialize some stuff */
 303         ret = quickstart_acpi_config(quickstart, acpi_device_bid(device));
 304         if (ret)
 305                 goto fail_config;
 306
 307         status = acpi_install_notify_handler(device->handle,
 308                                                 ACPI_ALL_NOTIFY,
 309                                                 quickstart_acpi_notify,
 310                                                 quickstart);
 311         if (ACPI_FAILURE(status)) {
 312                 printk(KERN_ERR "quickstart: Notify handler install error\n");
 313                 ret = -ENODEV;
 314                 goto fail_installnotify;
 315         }
 316
 317         quickstart_acpi_ghid(quickstart);
 318
 319         return 0;
 320
 321 fail_installnotify:
 322         quickstart_btnlst_del(quickstart->btn);
 323
 324 fail_config:
 325
 326         kfree(quickstart);
 327
 328         return ret;
 329 }
 330
 331 static int quickstart_acpi_remove(struct acpi_device *device, int type)
 332 {
 333         acpi_status status = 0;
 334         struct quickstart_acpi *quickstart = NULL;
 335
 336         if (!device || !acpi_driver_data(device))
 337                 return -EINVAL;
 338
 339         quickstart = acpi_driver_data(device);
 340
 341         status = acpi_remove_notify_handler(device->handle,
 342                                                  ACPI_ALL_NOTIFY,
 343                                             quickstart_acpi_notify);
 344         if (ACPI_FAILURE(status))
 345                 printk(KERN_ERR "quickstart: Error removing notify handler\n");
 346
 347
 348         kfree(quickstart);
 349
 350         return 0;
 351 }
 352
 353 /* Module functions */
 354
 355 static void quickstart_exit(void)
 356 {
 357         input_unregister_device(quickstart_input);
 358         input_free_device(quickstart_input);
 359
 360         device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
 361         device_remove_file(&pf_device->dev, &dev_attr_buttons);
 362
 363         platform_device_unregister(pf_device);
 364
 365         platform_driver_unregister(&pf_driver);
 366
 367         acpi_bus_unregister_driver(&quickstart_acpi_driver);
 368
 369         quickstart_btnlst_free();
 370
 371         return;
 372 }
 373
 374 static int __init quickstart_init_input(void)
 375 {
 376         struct quickstart_btn **ptr = &quickstart_data.btn_lst;
 377         int count;
 378
 379         quickstart_input = input_allocate_device();
 380
 381         if (!quickstart_input)
 382                 return -ENOMEM;
 383
 384         quickstart_input->name = "Quickstart ACPI Buttons";
 385         quickstart_input->id.bustype = BUS_HOST;
 386
 387         while (*ptr) {
 388                 count++;
 389                 set_bit(EV_KEY, quickstart_input->evbit);
 390                 set_bit((*ptr)->id, quickstart_input->keybit);
 391                 ptr = &((*ptr)->next);
 392         }
 393
 394         return input_register_device(quickstart_input);
 395 }
 396
 397 static int __init quickstart_init(void)
 398 {
 399         int ret;
 400
 401         /* ACPI Check */
 402         if (acpi_disabled)
 403                 return -ENODEV;
 404
 405         /* ACPI driver register */
 406         ret = acpi_bus_register_driver(&quickstart_acpi_driver);
 407         if (ret)
 408                 return ret;
 409
 410         /* If existing bus with no devices */
 411         if (!quickstart_data.btn_lst) {
 412                 ret = -ENODEV;
 413                 goto fail_pfdrv_reg;
 414         }
 415
 416         /* Platform driver register */
 417         ret = platform_driver_register(&pf_driver);
 418         if (ret)
 419                 goto fail_pfdrv_reg;
 420
 421         /* Platform device register */
 422         pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
 423         if (!pf_device) {
 424                 ret = -ENOMEM;
 425                 goto fail_pfdev_alloc;
 426         }
 427         ret = platform_device_add(pf_device);
 428         if (ret)
 429                 goto fail_pfdev_add;
 430
 431         /* Create device sysfs file */
 432         ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
 433         if (ret)
 434                 goto fail_dev_file;
 435
 436         ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
 437         if (ret)
 438                 goto fail_dev_file2;
 439
 440
 441         /* Input device */
 442         ret = quickstart_init_input();
 443         if (ret)
 444                 goto fail_input;
 445
 446         printk(KERN_INFO "quickstart: ACPI Direct App Launch ver %s\n",
 447                                                 QUICKSTART_VERSION);
 448
 449         return 0;
 450 fail_input:
 451         device_remove_file(&pf_device->dev, &dev_attr_buttons);
 452
 453 fail_dev_file2:
 454         device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
 455
 456 fail_dev_file:
 457         platform_device_del(pf_device);
 458
 459 fail_pfdev_add:
 460         platform_device_put(pf_device);
 461
 462 fail_pfdev_alloc:
 463         platform_driver_unregister(&pf_driver);
 464
 465 fail_pfdrv_reg:
 466         acpi_bus_unregister_driver(&quickstart_acpi_driver);
 467
 468         return ret;
 469 }
 470
 471 module_init(quickstart_init);
 472 module_exit(quickstart_exit);