1 /* 2 * Panasonic HotKey and LCD brightness control driver 3 * (C) 2004 Hiroshi Miura <miura@da-cha.org> 4 * (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/ 5 * (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp> 6 * (C) 2004 David Bronaugh <dbronaugh> 7 * (C) 2006-2008 Harald Welte <laforge@gnumonks.org> 8 * 9 * derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * publicshed by the Free Software Foundation. 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 * ChangeLog: 27 * Sep.23, 2008 Harald Welte <laforge@gnumonks.org> 28 * -v0.95 rename driver from drivers/acpi/pcc_acpi.c to 29 * drivers/misc/panasonic-laptop.c 30 * 31 * Jul.04, 2008 Harald Welte <laforge@gnumonks.org> 32 * -v0.94 replace /proc interface with device attributes 33 * support {set,get}keycode on th input device 34 * 35 * Jun.27, 2008 Harald Welte <laforge@gnumonks.org> 36 * -v0.92 merge with 2.6.26-rc6 input API changes 37 * remove broken <= 2.6.15 kernel support 38 * resolve all compiler warnings 39 * various coding style fixes (checkpatch.pl) 40 * add support for backlight api 41 * major code restructuring 42 * 43 * Dac.28, 2007 Harald Welte <laforge@gnumonks.org> 44 * -v0.91 merge with 2.6.24-rc6 ACPI changes 45 * 46 * Nov.04, 2006 Hiroshi Miura <miura@da-cha.org> 47 * -v0.9 remove warning about section reference. 48 * remove acpi_os_free 49 * add /proc/acpi/pcc/brightness interface for HAL access 50 * merge dbronaugh's enhancement 51 * Aug.17, 2004 David Bronaugh (dbronaugh) 52 * - Added screen brightness setting interface 53 * Thanks to FreeBSD crew (acpi_panasonic.c) 54 * for the ideas I needed to accomplish it 55 * 56 * May.29, 2006 Hiroshi Miura <miura@da-cha.org> 57 * -v0.8.4 follow to change keyinput structure 58 * thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>, 59 * Jacob Bower <jacob.bower@ic.ac.uk> and 60 * Hiroshi Yokota for providing solutions. 61 * 62 * Oct.02, 2004 Hiroshi Miura <miura@da-cha.org> 63 * -v0.8.2 merge code of YOKOTA Hiroshi 64 * <yokota@netlab.is.tsukuba.ac.jp>. 65 * Add sticky key mode interface. 66 * Refactoring acpi_pcc_generate_keyinput(). 67 * 68 * Sep.15, 2004 Hiroshi Miura <miura@da-cha.org> 69 * -v0.8 Generate key input event on input subsystem. 70 * This is based on yet another driver written by 71 * Ryuta Nakanishi. 72 * 73 * Sep.10, 2004 Hiroshi Miura <miura@da-cha.org> 74 * -v0.7 Change proc interface functions using seq_file 75 * facility as same as other ACPI drivers. 76 * 77 * Aug.28, 2004 Hiroshi Miura <miura@da-cha.org> 78 * -v0.6.4 Fix a silly error with status checking 79 * 80 * Aug.25, 2004 Hiroshi Miura <miura@da-cha.org> 81 * -v0.6.3 replace read_acpi_int by standard function 82 * acpi_evaluate_integer 83 * some clean up and make smart copyright notice. 84 * fix return value of pcc_acpi_get_key() 85 * fix checking return value of acpi_bus_register_driver() 86 * 87 * Aug.22, 2004 David Bronaugh <dbronaugh@linuxboxen.org> 88 * -v0.6.2 Add check on ACPI data (num_sifr) 89 * Coding style cleanups, better error messages/handling 90 * Fixed an off-by-one error in memory allocation 91 * 92 * Aug.21, 2004 David Bronaugh <dbronaugh@linuxboxen.org> 93 * -v0.6.1 Fix a silly error with status checking 94 * 95 * Aug.20, 2004 David Bronaugh <dbronaugh@linuxboxen.org> 96 * - v0.6 Correct brightness controls to reflect reality 97 * based on information gleaned by Hiroshi Miura 98 * and discussions with Hiroshi Miura 99 * 100 * Aug.10, 2004 Hiroshi Miura <miura@da-cha.org> 101 * - v0.5 support LCD brightness control 102 * based on the disclosed information by MEI. 103 * 104 * Jul.25, 2004 Hiroshi Miura <miura@da-cha.org> 105 * - v0.4 first post version 106 * add function to retrive SIFR 107 * 108 * Jul.24, 2004 Hiroshi Miura <miura@da-cha.org> 109 * - v0.3 get proper status of hotkey 110 * 111 * Jul.22, 2004 Hiroshi Miura <miura@da-cha.org> 112 * - v0.2 add HotKey handler 113 * 114 * Jul.17, 2004 Hiroshi Miura <miura@da-cha.org> 115 * - v0.1 start from toshiba_acpi driver written by John Belmonte 116 * 117 */ 118 119 #include <linux/kernel.h> 120 #include <linux/module.h> 121 #include <linux/init.h> 122 #include <linux/types.h> 123 #include <linux/backlight.h> 124 #include <linux/ctype.h> 125 #include <linux/seq_file.h> 126 #include <linux/uaccess.h> 127 #include <linux/slab.h> 128 #include <acpi/acpi_bus.h> 129 #include <acpi/acpi_drivers.h> 130 #include <linux/input.h> 131 #include <linux/input/sparse-keymap.h> 132 133 134 #ifndef ACPI_HOTKEY_COMPONENT 135 #define ACPI_HOTKEY_COMPONENT 0x10000000 136 #endif 137 138 #define _COMPONENT ACPI_HOTKEY_COMPONENT 139 140 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte"); 141 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops"); 142 MODULE_LICENSE("GPL"); 143 144 #define LOGPREFIX "pcc_acpi: " 145 146 /* Define ACPI PATHs */ 147 /* Lets note hotkeys */ 148 #define METHOD_HKEY_QUERY "HINF" 149 #define METHOD_HKEY_SQTY "SQTY" 150 #define METHOD_HKEY_SINF "SINF" 151 #define METHOD_HKEY_SSET "SSET" 152 #define HKEY_NOTIFY 0x80 153 154 #define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support" 155 #define ACPI_PCC_DEVICE_NAME "Hotkey" 156 #define ACPI_PCC_CLASS "pcc" 157 158 #define ACPI_PCC_INPUT_PHYS "panasonic/hkey0" 159 160 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent 161 ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00 162 */ 163 enum SINF_BITS { SINF_NUM_BATTERIES = 0, 164 SINF_LCD_TYPE, 165 SINF_AC_MAX_BRIGHT, 166 SINF_AC_MIN_BRIGHT, 167 SINF_AC_CUR_BRIGHT, 168 SINF_DC_MAX_BRIGHT, 169 SINF_DC_MIN_BRIGHT, 170 SINF_DC_CUR_BRIGHT, 171 SINF_MUTE, 172 SINF_RESERVED, 173 SINF_ENV_STATE, 174 SINF_STICKY_KEY = 0x80, 175 }; 176 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */ 177 178 static int acpi_pcc_hotkey_add(struct acpi_device *device); 179 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type); 180 static int acpi_pcc_hotkey_resume(struct acpi_device *device); 181 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event); 182 183 static const struct acpi_device_id pcc_device_ids[] = { 184 { "MAT0012", 0}, 185 { "MAT0013", 0}, 186 { "MAT0018", 0}, 187 { "MAT0019", 0}, 188 { "", 0}, 189 }; 190 MODULE_DEVICE_TABLE(acpi, pcc_device_ids); 191 192 static struct acpi_driver acpi_pcc_driver = { 193 .name = ACPI_PCC_DRIVER_NAME, 194 .class = ACPI_PCC_CLASS, 195 .ids = pcc_device_ids, 196 .ops = { 197 .add = acpi_pcc_hotkey_add, 198 .remove = acpi_pcc_hotkey_remove, 199 .resume = acpi_pcc_hotkey_resume, 200 .notify = acpi_pcc_hotkey_notify, 201 }, 202 }; 203 204 static const struct key_entry panasonic_keymap[] = { 205 { KE_KEY, 0, { KEY_RESERVED } }, 206 { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } }, 207 { KE_KEY, 2, { KEY_BRIGHTNESSUP } }, 208 { KE_KEY, 3, { KEY_DISPLAYTOGGLE } }, 209 { KE_KEY, 4, { KEY_MUTE } }, 210 { KE_KEY, 5, { KEY_VOLUMEDOWN } }, 211 { KE_KEY, 6, { KEY_VOLUMEUP } }, 212 { KE_KEY, 7, { KEY_SLEEP } }, 213 { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */ 214 { KE_KEY, 9, { KEY_BATTERY } }, 215 { KE_KEY, 10, { KEY_SUSPEND } }, 216 { KE_END, 0 } 217 }; 218 219 struct pcc_acpi { 220 acpi_handle handle; 221 unsigned long num_sifr; 222 int sticky_mode; 223 u32 *sinf; 224 struct acpi_device *device; 225 struct input_dev *input_dev; 226 struct backlight_device *backlight; 227 }; 228 229 struct pcc_keyinput { 230 struct acpi_hotkey *hotkey; 231 }; 232 233 /* method access functions */ 234 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val) 235 { 236 union acpi_object in_objs[] = { 237 { .integer.type = ACPI_TYPE_INTEGER, 238 .integer.value = func, }, 239 { .integer.type = ACPI_TYPE_INTEGER, 240 .integer.value = val, }, 241 }; 242 struct acpi_object_list params = { 243 .count = ARRAY_SIZE(in_objs), 244 .pointer = in_objs, 245 }; 246 acpi_status status = AE_OK; 247 248 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET, 249 ¶ms, NULL); 250 251 return (status == AE_OK) ? 0 : -EIO; 252 } 253 254 static inline int acpi_pcc_get_sqty(struct acpi_device *device) 255 { 256 unsigned long long s; 257 acpi_status status; 258 259 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY, 260 NULL, &s); 261 if (ACPI_SUCCESS(status)) 262 return s; 263 else { 264 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 265 "evaluation error HKEY.SQTY\n")); 266 return -EINVAL; 267 } 268 } 269 270 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc) 271 { 272 acpi_status status; 273 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 274 union acpi_object *hkey = NULL; 275 int i; 276 277 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL, 278 &buffer); 279 if (ACPI_FAILURE(status)) { 280 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 281 "evaluation error HKEY.SINF\n")); 282 return 0; 283 } 284 285 hkey = buffer.pointer; 286 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) { 287 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n")); 288 status = AE_ERROR; 289 goto end; 290 } 291 292 if (pcc->num_sifr < hkey->package.count) { 293 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 294 "SQTY reports bad SINF length\n")); 295 status = AE_ERROR; 296 goto end; 297 } 298 299 for (i = 0; i < hkey->package.count; i++) { 300 union acpi_object *element = &(hkey->package.elements[i]); 301 if (likely(element->type == ACPI_TYPE_INTEGER)) { 302 pcc->sinf[i] = element->integer.value; 303 } else 304 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 305 "Invalid HKEY.SINF data\n")); 306 } 307 pcc->sinf[hkey->package.count] = -1; 308 309 end: 310 kfree(buffer.pointer); 311 return status == AE_OK; 312 } 313 314 /* backlight API interface functions */ 315 316 /* This driver currently treats AC and DC brightness identical, 317 * since we don't need to invent an interface to the core ACPI 318 * logic to receive events in case a power supply is plugged in 319 * or removed */ 320 321 static int bl_get(struct backlight_device *bd) 322 { 323 struct pcc_acpi *pcc = bl_get_data(bd); 324 325 if (!acpi_pcc_retrieve_biosdata(pcc)) 326 return -EIO; 327 328 return pcc->sinf[SINF_AC_CUR_BRIGHT]; 329 } 330 331 static int bl_set_status(struct backlight_device *bd) 332 { 333 struct pcc_acpi *pcc = bl_get_data(bd); 334 int bright = bd->props.brightness; 335 int rc; 336 337 if (!acpi_pcc_retrieve_biosdata(pcc)) 338 return -EIO; 339 340 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT]) 341 bright = pcc->sinf[SINF_AC_MIN_BRIGHT]; 342 343 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT]) 344 bright = pcc->sinf[SINF_DC_MIN_BRIGHT]; 345 346 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] || 347 bright > pcc->sinf[SINF_AC_MAX_BRIGHT]) 348 return -EINVAL; 349 350 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright); 351 if (rc < 0) 352 return rc; 353 354 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright); 355 } 356 357 static const struct backlight_ops pcc_backlight_ops = { 358 .get_brightness = bl_get, 359 .update_status = bl_set_status, 360 }; 361 362 363 /* sysfs user interface functions */ 364 365 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr, 366 char *buf) 367 { 368 struct acpi_device *acpi = to_acpi_device(dev); 369 struct pcc_acpi *pcc = acpi_driver_data(acpi); 370 371 if (!acpi_pcc_retrieve_biosdata(pcc)) 372 return -EIO; 373 374 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]); 375 } 376 377 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr, 378 char *buf) 379 { 380 struct acpi_device *acpi = to_acpi_device(dev); 381 struct pcc_acpi *pcc = acpi_driver_data(acpi); 382 383 if (!acpi_pcc_retrieve_biosdata(pcc)) 384 return -EIO; 385 386 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]); 387 } 388 389 static ssize_t show_mute(struct device *dev, struct device_attribute *attr, 390 char *buf) 391 { 392 struct acpi_device *acpi = to_acpi_device(dev); 393 struct pcc_acpi *pcc = acpi_driver_data(acpi); 394 395 if (!acpi_pcc_retrieve_biosdata(pcc)) 396 return -EIO; 397 398 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]); 399 } 400 401 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr, 402 char *buf) 403 { 404 struct acpi_device *acpi = to_acpi_device(dev); 405 struct pcc_acpi *pcc = acpi_driver_data(acpi); 406 407 if (!acpi_pcc_retrieve_biosdata(pcc)) 408 return -EIO; 409 410 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]); 411 } 412 413 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr, 414 const char *buf, size_t count) 415 { 416 struct acpi_device *acpi = to_acpi_device(dev); 417 struct pcc_acpi *pcc = acpi_driver_data(acpi); 418 int val; 419 420 if (count && sscanf(buf, "%i", &val) == 1 && 421 (val == 0 || val == 1)) { 422 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val); 423 pcc->sticky_mode = val; 424 } 425 426 return count; 427 } 428 429 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL); 430 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL); 431 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL); 432 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky); 433 434 static struct attribute *pcc_sysfs_entries[] = { 435 &dev_attr_numbatt.attr, 436 &dev_attr_lcdtype.attr, 437 &dev_attr_mute.attr, 438 &dev_attr_sticky_key.attr, 439 NULL, 440 }; 441 442 static struct attribute_group pcc_attr_group = { 443 .name = NULL, /* put in device directory */ 444 .attrs = pcc_sysfs_entries, 445 }; 446 447 448 /* hotkey input device driver */ 449 450 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc) 451 { 452 struct input_dev *hotk_input_dev = pcc->input_dev; 453 int rc; 454 unsigned long long result; 455 456 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY, 457 NULL, &result); 458 if (!ACPI_SUCCESS(rc)) { 459 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 460 "error getting hotkey status\n")); 461 return; 462 } 463 464 acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result); 465 466 if (!sparse_keymap_report_event(hotk_input_dev, 467 result & 0xf, result & 0x80, false)) 468 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 469 "Unknown hotkey event: %d\n", result)); 470 } 471 472 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event) 473 { 474 struct pcc_acpi *pcc = acpi_driver_data(device); 475 476 switch (event) { 477 case HKEY_NOTIFY: 478 acpi_pcc_generate_keyinput(pcc); 479 break; 480 default: 481 /* nothing to do */ 482 break; 483 } 484 } 485 486 static int acpi_pcc_init_input(struct pcc_acpi *pcc) 487 { 488 struct input_dev *input_dev; 489 int error; 490 491 input_dev = input_allocate_device(); 492 if (!input_dev) { 493 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 494 "Couldn't allocate input device for hotkey")); 495 return -ENOMEM; 496 } 497 498 input_dev->name = ACPI_PCC_DRIVER_NAME; 499 input_dev->phys = ACPI_PCC_INPUT_PHYS; 500 input_dev->id.bustype = BUS_HOST; 501 input_dev->id.vendor = 0x0001; 502 input_dev->id.product = 0x0001; 503 input_dev->id.version = 0x0100; 504 505 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL); 506 if (error) { 507 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 508 "Unable to setup input device keymap\n")); 509 goto err_free_dev; 510 } 511 512 error = input_register_device(input_dev); 513 if (error) { 514 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 515 "Unable to register input device\n")); 516 goto err_free_keymap; 517 } 518 519 pcc->input_dev = input_dev; 520 return 0; 521 522 err_free_keymap: 523 sparse_keymap_free(input_dev); 524 err_free_dev: 525 input_free_device(input_dev); 526 return error; 527 } 528 529 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc) 530 { 531 sparse_keymap_free(pcc->input_dev); 532 input_unregister_device(pcc->input_dev); 533 /* 534 * No need to input_free_device() since core input API refcounts 535 * and free()s the device. 536 */ 537 } 538 539 /* kernel module interface */ 540 541 static int acpi_pcc_hotkey_resume(struct acpi_device *device) 542 { 543 struct pcc_acpi *pcc = acpi_driver_data(device); 544 545 if (device == NULL || pcc == NULL) 546 return -EINVAL; 547 548 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n", 549 pcc->sticky_mode)); 550 551 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode); 552 } 553 554 static int acpi_pcc_hotkey_add(struct acpi_device *device) 555 { 556 struct backlight_properties props; 557 struct pcc_acpi *pcc; 558 int num_sifr, result; 559 560 if (!device) 561 return -EINVAL; 562 563 num_sifr = acpi_pcc_get_sqty(device); 564 565 if (num_sifr > 255) { 566 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large")); 567 return -ENODEV; 568 } 569 570 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL); 571 if (!pcc) { 572 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 573 "Couldn't allocate mem for pcc")); 574 return -ENOMEM; 575 } 576 577 pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL); 578 if (!pcc->sinf) { 579 result = -ENOMEM; 580 goto out_hotkey; 581 } 582 583 pcc->device = device; 584 pcc->handle = device->handle; 585 pcc->num_sifr = num_sifr; 586 device->driver_data = pcc; 587 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME); 588 strcpy(acpi_device_class(device), ACPI_PCC_CLASS); 589 590 result = acpi_pcc_init_input(pcc); 591 if (result) { 592 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 593 "Error installing keyinput handler\n")); 594 goto out_sinf; 595 } 596 597 if (!acpi_pcc_retrieve_biosdata(pcc)) { 598 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 599 "Couldn't retrieve BIOS data\n")); 600 result = -EIO; 601 goto out_input; 602 } 603 /* initialize backlight */ 604 memset(&props, 0, sizeof(struct backlight_properties)); 605 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT]; 606 pcc->backlight = backlight_device_register("panasonic", NULL, pcc, 607 &pcc_backlight_ops, &props); 608 if (IS_ERR(pcc->backlight)) { 609 result = PTR_ERR(pcc->backlight); 610 goto out_input; 611 } 612 613 /* read the initial brightness setting from the hardware */ 614 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT]; 615 616 /* read the initial sticky key mode from the hardware */ 617 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY]; 618 619 /* add sysfs attributes */ 620 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group); 621 if (result) 622 goto out_backlight; 623 624 return 0; 625 626 out_backlight: 627 backlight_device_unregister(pcc->backlight); 628 out_input: 629 acpi_pcc_destroy_input(pcc); 630 out_sinf: 631 kfree(pcc->sinf); 632 out_hotkey: 633 kfree(pcc); 634 635 return result; 636 } 637 638 static int __init acpi_pcc_init(void) 639 { 640 int result = 0; 641 642 if (acpi_disabled) 643 return -ENODEV; 644 645 result = acpi_bus_register_driver(&acpi_pcc_driver); 646 if (result < 0) { 647 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 648 "Error registering hotkey driver\n")); 649 return -ENODEV; 650 } 651 652 return 0; 653 } 654 655 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type) 656 { 657 struct pcc_acpi *pcc = acpi_driver_data(device); 658 659 if (!device || !pcc) 660 return -EINVAL; 661 662 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group); 663 664 backlight_device_unregister(pcc->backlight); 665 666 acpi_pcc_destroy_input(pcc); 667 668 kfree(pcc->sinf); 669 kfree(pcc); 670 671 return 0; 672 } 673 674 static void __exit acpi_pcc_exit(void) 675 { 676 acpi_bus_unregister_driver(&acpi_pcc_driver); 677 } 678 679 module_init(acpi_pcc_init); 680 module_exit(acpi_pcc_exit); 681