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 <linux/acpi.h> 129 #include <linux/input.h> 130 #include <linux/input/sparse-keymap.h> 131 132 #ifndef ACPI_HOTKEY_COMPONENT 133 #define ACPI_HOTKEY_COMPONENT 0x10000000 134 #endif 135 136 #define _COMPONENT ACPI_HOTKEY_COMPONENT 137 138 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte"); 139 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops"); 140 MODULE_LICENSE("GPL"); 141 142 #define LOGPREFIX "pcc_acpi: " 143 144 /* Define ACPI PATHs */ 145 /* Lets note hotkeys */ 146 #define METHOD_HKEY_QUERY "HINF" 147 #define METHOD_HKEY_SQTY "SQTY" 148 #define METHOD_HKEY_SINF "SINF" 149 #define METHOD_HKEY_SSET "SSET" 150 #define HKEY_NOTIFY 0x80 151 152 #define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support" 153 #define ACPI_PCC_DEVICE_NAME "Hotkey" 154 #define ACPI_PCC_CLASS "pcc" 155 156 #define ACPI_PCC_INPUT_PHYS "panasonic/hkey0" 157 158 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent 159 ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00 160 */ 161 enum SINF_BITS { SINF_NUM_BATTERIES = 0, 162 SINF_LCD_TYPE, 163 SINF_AC_MAX_BRIGHT, 164 SINF_AC_MIN_BRIGHT, 165 SINF_AC_CUR_BRIGHT, 166 SINF_DC_MAX_BRIGHT, 167 SINF_DC_MIN_BRIGHT, 168 SINF_DC_CUR_BRIGHT, 169 SINF_MUTE, 170 SINF_RESERVED, 171 SINF_ENV_STATE, 172 SINF_STICKY_KEY = 0x80, 173 }; 174 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */ 175 176 static int acpi_pcc_hotkey_add(struct acpi_device *device); 177 static int acpi_pcc_hotkey_remove(struct acpi_device *device); 178 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event); 179 180 static const struct acpi_device_id pcc_device_ids[] = { 181 { "MAT0012", 0}, 182 { "MAT0013", 0}, 183 { "MAT0018", 0}, 184 { "MAT0019", 0}, 185 { "", 0}, 186 }; 187 MODULE_DEVICE_TABLE(acpi, pcc_device_ids); 188 189 #ifdef CONFIG_PM_SLEEP 190 static int acpi_pcc_hotkey_resume(struct device *dev); 191 #endif 192 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume); 193 194 static struct acpi_driver acpi_pcc_driver = { 195 .name = ACPI_PCC_DRIVER_NAME, 196 .class = ACPI_PCC_CLASS, 197 .ids = pcc_device_ids, 198 .ops = { 199 .add = acpi_pcc_hotkey_add, 200 .remove = acpi_pcc_hotkey_remove, 201 .notify = acpi_pcc_hotkey_notify, 202 }, 203 .drv.pm = &acpi_pcc_hotkey_pm, 204 }; 205 206 static const struct key_entry panasonic_keymap[] = { 207 { KE_KEY, 0, { KEY_RESERVED } }, 208 { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } }, 209 { KE_KEY, 2, { KEY_BRIGHTNESSUP } }, 210 { KE_KEY, 3, { KEY_DISPLAYTOGGLE } }, 211 { KE_KEY, 4, { KEY_MUTE } }, 212 { KE_KEY, 5, { KEY_VOLUMEDOWN } }, 213 { KE_KEY, 6, { KEY_VOLUMEUP } }, 214 { KE_KEY, 7, { KEY_SLEEP } }, 215 { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */ 216 { KE_KEY, 9, { KEY_BATTERY } }, 217 { KE_KEY, 10, { KEY_SUSPEND } }, 218 { KE_END, 0 } 219 }; 220 221 struct pcc_acpi { 222 acpi_handle handle; 223 unsigned long num_sifr; 224 int sticky_mode; 225 u32 *sinf; 226 struct acpi_device *device; 227 struct input_dev *input_dev; 228 struct backlight_device *backlight; 229 }; 230 231 /* method access functions */ 232 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val) 233 { 234 union acpi_object in_objs[] = { 235 { .integer.type = ACPI_TYPE_INTEGER, 236 .integer.value = func, }, 237 { .integer.type = ACPI_TYPE_INTEGER, 238 .integer.value = val, }, 239 }; 240 struct acpi_object_list params = { 241 .count = ARRAY_SIZE(in_objs), 242 .pointer = in_objs, 243 }; 244 acpi_status status = AE_OK; 245 246 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET, 247 ¶ms, NULL); 248 249 return (status == AE_OK) ? 0 : -EIO; 250 } 251 252 static inline int acpi_pcc_get_sqty(struct acpi_device *device) 253 { 254 unsigned long long s; 255 acpi_status status; 256 257 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY, 258 NULL, &s); 259 if (ACPI_SUCCESS(status)) 260 return s; 261 else { 262 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 263 "evaluation error HKEY.SQTY\n")); 264 return -EINVAL; 265 } 266 } 267 268 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc) 269 { 270 acpi_status status; 271 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 272 union acpi_object *hkey = NULL; 273 int i; 274 275 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL, 276 &buffer); 277 if (ACPI_FAILURE(status)) { 278 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 279 "evaluation error HKEY.SINF\n")); 280 return 0; 281 } 282 283 hkey = buffer.pointer; 284 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) { 285 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n")); 286 status = AE_ERROR; 287 goto end; 288 } 289 290 if (pcc->num_sifr < hkey->package.count) { 291 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 292 "SQTY reports bad SINF length\n")); 293 status = AE_ERROR; 294 goto end; 295 } 296 297 for (i = 0; i < hkey->package.count; i++) { 298 union acpi_object *element = &(hkey->package.elements[i]); 299 if (likely(element->type == ACPI_TYPE_INTEGER)) { 300 pcc->sinf[i] = element->integer.value; 301 } else 302 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 303 "Invalid HKEY.SINF data\n")); 304 } 305 pcc->sinf[hkey->package.count] = -1; 306 307 end: 308 kfree(buffer.pointer); 309 return status == AE_OK; 310 } 311 312 /* backlight API interface functions */ 313 314 /* This driver currently treats AC and DC brightness identical, 315 * since we don't need to invent an interface to the core ACPI 316 * logic to receive events in case a power supply is plugged in 317 * or removed */ 318 319 static int bl_get(struct backlight_device *bd) 320 { 321 struct pcc_acpi *pcc = bl_get_data(bd); 322 323 if (!acpi_pcc_retrieve_biosdata(pcc)) 324 return -EIO; 325 326 return pcc->sinf[SINF_AC_CUR_BRIGHT]; 327 } 328 329 static int bl_set_status(struct backlight_device *bd) 330 { 331 struct pcc_acpi *pcc = bl_get_data(bd); 332 int bright = bd->props.brightness; 333 int rc; 334 335 if (!acpi_pcc_retrieve_biosdata(pcc)) 336 return -EIO; 337 338 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT]) 339 bright = pcc->sinf[SINF_AC_MIN_BRIGHT]; 340 341 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT]) 342 bright = pcc->sinf[SINF_DC_MIN_BRIGHT]; 343 344 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] || 345 bright > pcc->sinf[SINF_AC_MAX_BRIGHT]) 346 return -EINVAL; 347 348 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright); 349 if (rc < 0) 350 return rc; 351 352 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright); 353 } 354 355 static const struct backlight_ops pcc_backlight_ops = { 356 .get_brightness = bl_get, 357 .update_status = bl_set_status, 358 }; 359 360 361 /* sysfs user interface functions */ 362 363 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr, 364 char *buf) 365 { 366 struct acpi_device *acpi = to_acpi_device(dev); 367 struct pcc_acpi *pcc = acpi_driver_data(acpi); 368 369 if (!acpi_pcc_retrieve_biosdata(pcc)) 370 return -EIO; 371 372 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]); 373 } 374 375 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr, 376 char *buf) 377 { 378 struct acpi_device *acpi = to_acpi_device(dev); 379 struct pcc_acpi *pcc = acpi_driver_data(acpi); 380 381 if (!acpi_pcc_retrieve_biosdata(pcc)) 382 return -EIO; 383 384 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]); 385 } 386 387 static ssize_t show_mute(struct device *dev, struct device_attribute *attr, 388 char *buf) 389 { 390 struct acpi_device *acpi = to_acpi_device(dev); 391 struct pcc_acpi *pcc = acpi_driver_data(acpi); 392 393 if (!acpi_pcc_retrieve_biosdata(pcc)) 394 return -EIO; 395 396 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]); 397 } 398 399 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr, 400 char *buf) 401 { 402 struct acpi_device *acpi = to_acpi_device(dev); 403 struct pcc_acpi *pcc = acpi_driver_data(acpi); 404 405 if (!acpi_pcc_retrieve_biosdata(pcc)) 406 return -EIO; 407 408 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]); 409 } 410 411 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr, 412 const char *buf, size_t count) 413 { 414 struct acpi_device *acpi = to_acpi_device(dev); 415 struct pcc_acpi *pcc = acpi_driver_data(acpi); 416 int val; 417 418 if (count && sscanf(buf, "%i", &val) == 1 && 419 (val == 0 || val == 1)) { 420 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val); 421 pcc->sticky_mode = val; 422 } 423 424 return count; 425 } 426 427 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL); 428 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL); 429 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL); 430 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky); 431 432 static struct attribute *pcc_sysfs_entries[] = { 433 &dev_attr_numbatt.attr, 434 &dev_attr_lcdtype.attr, 435 &dev_attr_mute.attr, 436 &dev_attr_sticky_key.attr, 437 NULL, 438 }; 439 440 static const struct attribute_group pcc_attr_group = { 441 .name = NULL, /* put in device directory */ 442 .attrs = pcc_sysfs_entries, 443 }; 444 445 446 /* hotkey input device driver */ 447 448 static int sleep_keydown_seen; 449 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc) 450 { 451 struct input_dev *hotk_input_dev = pcc->input_dev; 452 int rc; 453 unsigned long long result; 454 455 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY, 456 NULL, &result); 457 if (ACPI_FAILURE(rc)) { 458 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 459 "error getting hotkey status\n")); 460 return; 461 } 462 463 /* hack: some firmware sends no key down for sleep / hibernate */ 464 if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) { 465 if (result & 0x80) 466 sleep_keydown_seen = 1; 467 if (!sleep_keydown_seen) 468 sparse_keymap_report_event(hotk_input_dev, 469 result & 0xf, 0x80, false); 470 } 471 472 if (!sparse_keymap_report_event(hotk_input_dev, 473 result & 0xf, result & 0x80, false)) 474 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 475 "Unknown hotkey event: %d\n", result)); 476 } 477 478 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event) 479 { 480 struct pcc_acpi *pcc = acpi_driver_data(device); 481 482 switch (event) { 483 case HKEY_NOTIFY: 484 acpi_pcc_generate_keyinput(pcc); 485 break; 486 default: 487 /* nothing to do */ 488 break; 489 } 490 } 491 492 static int acpi_pcc_init_input(struct pcc_acpi *pcc) 493 { 494 struct input_dev *input_dev; 495 int error; 496 497 input_dev = input_allocate_device(); 498 if (!input_dev) 499 return -ENOMEM; 500 501 input_dev->name = ACPI_PCC_DRIVER_NAME; 502 input_dev->phys = ACPI_PCC_INPUT_PHYS; 503 input_dev->id.bustype = BUS_HOST; 504 input_dev->id.vendor = 0x0001; 505 input_dev->id.product = 0x0001; 506 input_dev->id.version = 0x0100; 507 508 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL); 509 if (error) { 510 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 511 "Unable to setup input device keymap\n")); 512 goto err_free_dev; 513 } 514 515 error = input_register_device(input_dev); 516 if (error) { 517 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 518 "Unable to register input device\n")); 519 goto err_free_dev; 520 } 521 522 pcc->input_dev = input_dev; 523 return 0; 524 525 err_free_dev: 526 input_free_device(input_dev); 527 return error; 528 } 529 530 /* kernel module interface */ 531 532 #ifdef CONFIG_PM_SLEEP 533 static int acpi_pcc_hotkey_resume(struct device *dev) 534 { 535 struct pcc_acpi *pcc; 536 537 if (!dev) 538 return -EINVAL; 539 540 pcc = acpi_driver_data(to_acpi_device(dev)); 541 if (!pcc) 542 return -EINVAL; 543 544 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n", 545 pcc->sticky_mode)); 546 547 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode); 548 } 549 #endif 550 551 static int acpi_pcc_hotkey_add(struct acpi_device *device) 552 { 553 struct backlight_properties props; 554 struct pcc_acpi *pcc; 555 int num_sifr, result; 556 557 if (!device) 558 return -EINVAL; 559 560 num_sifr = acpi_pcc_get_sqty(device); 561 562 if (num_sifr < 0 || num_sifr > 255) { 563 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range")); 564 return -ENODEV; 565 } 566 567 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL); 568 if (!pcc) { 569 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 570 "Couldn't allocate mem for pcc")); 571 return -ENOMEM; 572 } 573 574 pcc->sinf = kcalloc(num_sifr + 1, sizeof(u32), GFP_KERNEL); 575 if (!pcc->sinf) { 576 result = -ENOMEM; 577 goto out_hotkey; 578 } 579 580 pcc->device = device; 581 pcc->handle = device->handle; 582 pcc->num_sifr = num_sifr; 583 device->driver_data = pcc; 584 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME); 585 strcpy(acpi_device_class(device), ACPI_PCC_CLASS); 586 587 result = acpi_pcc_init_input(pcc); 588 if (result) { 589 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 590 "Error installing keyinput handler\n")); 591 goto out_sinf; 592 } 593 594 if (!acpi_pcc_retrieve_biosdata(pcc)) { 595 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 596 "Couldn't retrieve BIOS data\n")); 597 result = -EIO; 598 goto out_input; 599 } 600 /* initialize backlight */ 601 memset(&props, 0, sizeof(struct backlight_properties)); 602 props.type = BACKLIGHT_PLATFORM; 603 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT]; 604 pcc->backlight = backlight_device_register("panasonic", NULL, pcc, 605 &pcc_backlight_ops, &props); 606 if (IS_ERR(pcc->backlight)) { 607 result = PTR_ERR(pcc->backlight); 608 goto out_input; 609 } 610 611 /* read the initial brightness setting from the hardware */ 612 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT]; 613 614 /* read the initial sticky key mode from the hardware */ 615 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY]; 616 617 /* add sysfs attributes */ 618 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group); 619 if (result) 620 goto out_backlight; 621 622 return 0; 623 624 out_backlight: 625 backlight_device_unregister(pcc->backlight); 626 out_input: 627 input_unregister_device(pcc->input_dev); 628 out_sinf: 629 kfree(pcc->sinf); 630 out_hotkey: 631 kfree(pcc); 632 633 return result; 634 } 635 636 static int acpi_pcc_hotkey_remove(struct acpi_device *device) 637 { 638 struct pcc_acpi *pcc = acpi_driver_data(device); 639 640 if (!device || !pcc) 641 return -EINVAL; 642 643 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group); 644 645 backlight_device_unregister(pcc->backlight); 646 647 input_unregister_device(pcc->input_dev); 648 649 kfree(pcc->sinf); 650 kfree(pcc); 651 652 return 0; 653 } 654 655 module_acpi_driver(acpi_pcc_driver); 656