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 void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event); 181 182 static const struct acpi_device_id pcc_device_ids[] = { 183 { "MAT0012", 0}, 184 { "MAT0013", 0}, 185 { "MAT0018", 0}, 186 { "MAT0019", 0}, 187 { "", 0}, 188 }; 189 MODULE_DEVICE_TABLE(acpi, pcc_device_ids); 190 191 #ifdef CONFIG_PM_SLEEP 192 static int acpi_pcc_hotkey_resume(struct device *dev); 193 #endif 194 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume); 195 196 static struct acpi_driver acpi_pcc_driver = { 197 .name = ACPI_PCC_DRIVER_NAME, 198 .class = ACPI_PCC_CLASS, 199 .ids = pcc_device_ids, 200 .ops = { 201 .add = acpi_pcc_hotkey_add, 202 .remove = acpi_pcc_hotkey_remove, 203 .notify = acpi_pcc_hotkey_notify, 204 }, 205 .drv.pm = &acpi_pcc_hotkey_pm, 206 }; 207 208 static const struct key_entry panasonic_keymap[] = { 209 { KE_KEY, 0, { KEY_RESERVED } }, 210 { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } }, 211 { KE_KEY, 2, { KEY_BRIGHTNESSUP } }, 212 { KE_KEY, 3, { KEY_DISPLAYTOGGLE } }, 213 { KE_KEY, 4, { KEY_MUTE } }, 214 { KE_KEY, 5, { KEY_VOLUMEDOWN } }, 215 { KE_KEY, 6, { KEY_VOLUMEUP } }, 216 { KE_KEY, 7, { KEY_SLEEP } }, 217 { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */ 218 { KE_KEY, 9, { KEY_BATTERY } }, 219 { KE_KEY, 10, { KEY_SUSPEND } }, 220 { KE_END, 0 } 221 }; 222 223 struct pcc_acpi { 224 acpi_handle handle; 225 unsigned long num_sifr; 226 int sticky_mode; 227 u32 *sinf; 228 struct acpi_device *device; 229 struct input_dev *input_dev; 230 struct backlight_device *backlight; 231 }; 232 233 struct pcc_keyinput { 234 struct acpi_hotkey *hotkey; 235 }; 236 237 /* method access functions */ 238 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val) 239 { 240 union acpi_object in_objs[] = { 241 { .integer.type = ACPI_TYPE_INTEGER, 242 .integer.value = func, }, 243 { .integer.type = ACPI_TYPE_INTEGER, 244 .integer.value = val, }, 245 }; 246 struct acpi_object_list params = { 247 .count = ARRAY_SIZE(in_objs), 248 .pointer = in_objs, 249 }; 250 acpi_status status = AE_OK; 251 252 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET, 253 ¶ms, NULL); 254 255 return (status == AE_OK) ? 0 : -EIO; 256 } 257 258 static inline int acpi_pcc_get_sqty(struct acpi_device *device) 259 { 260 unsigned long long s; 261 acpi_status status; 262 263 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY, 264 NULL, &s); 265 if (ACPI_SUCCESS(status)) 266 return s; 267 else { 268 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 269 "evaluation error HKEY.SQTY\n")); 270 return -EINVAL; 271 } 272 } 273 274 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc) 275 { 276 acpi_status status; 277 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 278 union acpi_object *hkey = NULL; 279 int i; 280 281 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL, 282 &buffer); 283 if (ACPI_FAILURE(status)) { 284 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 285 "evaluation error HKEY.SINF\n")); 286 return 0; 287 } 288 289 hkey = buffer.pointer; 290 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) { 291 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n")); 292 status = AE_ERROR; 293 goto end; 294 } 295 296 if (pcc->num_sifr < hkey->package.count) { 297 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 298 "SQTY reports bad SINF length\n")); 299 status = AE_ERROR; 300 goto end; 301 } 302 303 for (i = 0; i < hkey->package.count; i++) { 304 union acpi_object *element = &(hkey->package.elements[i]); 305 if (likely(element->type == ACPI_TYPE_INTEGER)) { 306 pcc->sinf[i] = element->integer.value; 307 } else 308 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 309 "Invalid HKEY.SINF data\n")); 310 } 311 pcc->sinf[hkey->package.count] = -1; 312 313 end: 314 kfree(buffer.pointer); 315 return status == AE_OK; 316 } 317 318 /* backlight API interface functions */ 319 320 /* This driver currently treats AC and DC brightness identical, 321 * since we don't need to invent an interface to the core ACPI 322 * logic to receive events in case a power supply is plugged in 323 * or removed */ 324 325 static int bl_get(struct backlight_device *bd) 326 { 327 struct pcc_acpi *pcc = bl_get_data(bd); 328 329 if (!acpi_pcc_retrieve_biosdata(pcc)) 330 return -EIO; 331 332 return pcc->sinf[SINF_AC_CUR_BRIGHT]; 333 } 334 335 static int bl_set_status(struct backlight_device *bd) 336 { 337 struct pcc_acpi *pcc = bl_get_data(bd); 338 int bright = bd->props.brightness; 339 int rc; 340 341 if (!acpi_pcc_retrieve_biosdata(pcc)) 342 return -EIO; 343 344 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT]) 345 bright = pcc->sinf[SINF_AC_MIN_BRIGHT]; 346 347 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT]) 348 bright = pcc->sinf[SINF_DC_MIN_BRIGHT]; 349 350 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] || 351 bright > pcc->sinf[SINF_AC_MAX_BRIGHT]) 352 return -EINVAL; 353 354 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright); 355 if (rc < 0) 356 return rc; 357 358 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright); 359 } 360 361 static const struct backlight_ops pcc_backlight_ops = { 362 .get_brightness = bl_get, 363 .update_status = bl_set_status, 364 }; 365 366 367 /* sysfs user interface functions */ 368 369 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr, 370 char *buf) 371 { 372 struct acpi_device *acpi = to_acpi_device(dev); 373 struct pcc_acpi *pcc = acpi_driver_data(acpi); 374 375 if (!acpi_pcc_retrieve_biosdata(pcc)) 376 return -EIO; 377 378 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]); 379 } 380 381 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr, 382 char *buf) 383 { 384 struct acpi_device *acpi = to_acpi_device(dev); 385 struct pcc_acpi *pcc = acpi_driver_data(acpi); 386 387 if (!acpi_pcc_retrieve_biosdata(pcc)) 388 return -EIO; 389 390 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]); 391 } 392 393 static ssize_t show_mute(struct device *dev, struct device_attribute *attr, 394 char *buf) 395 { 396 struct acpi_device *acpi = to_acpi_device(dev); 397 struct pcc_acpi *pcc = acpi_driver_data(acpi); 398 399 if (!acpi_pcc_retrieve_biosdata(pcc)) 400 return -EIO; 401 402 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]); 403 } 404 405 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr, 406 char *buf) 407 { 408 struct acpi_device *acpi = to_acpi_device(dev); 409 struct pcc_acpi *pcc = acpi_driver_data(acpi); 410 411 if (!acpi_pcc_retrieve_biosdata(pcc)) 412 return -EIO; 413 414 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]); 415 } 416 417 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr, 418 const char *buf, size_t count) 419 { 420 struct acpi_device *acpi = to_acpi_device(dev); 421 struct pcc_acpi *pcc = acpi_driver_data(acpi); 422 int val; 423 424 if (count && sscanf(buf, "%i", &val) == 1 && 425 (val == 0 || val == 1)) { 426 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val); 427 pcc->sticky_mode = val; 428 } 429 430 return count; 431 } 432 433 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL); 434 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL); 435 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL); 436 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky); 437 438 static struct attribute *pcc_sysfs_entries[] = { 439 &dev_attr_numbatt.attr, 440 &dev_attr_lcdtype.attr, 441 &dev_attr_mute.attr, 442 &dev_attr_sticky_key.attr, 443 NULL, 444 }; 445 446 static struct attribute_group pcc_attr_group = { 447 .name = NULL, /* put in device directory */ 448 .attrs = pcc_sysfs_entries, 449 }; 450 451 452 /* hotkey input device driver */ 453 454 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc) 455 { 456 struct input_dev *hotk_input_dev = pcc->input_dev; 457 int rc; 458 unsigned long long result; 459 460 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY, 461 NULL, &result); 462 if (!ACPI_SUCCESS(rc)) { 463 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 464 "error getting hotkey status\n")); 465 return; 466 } 467 468 acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result); 469 470 if (!sparse_keymap_report_event(hotk_input_dev, 471 result & 0xf, result & 0x80, false)) 472 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 473 "Unknown hotkey event: %d\n", result)); 474 } 475 476 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event) 477 { 478 struct pcc_acpi *pcc = acpi_driver_data(device); 479 480 switch (event) { 481 case HKEY_NOTIFY: 482 acpi_pcc_generate_keyinput(pcc); 483 break; 484 default: 485 /* nothing to do */ 486 break; 487 } 488 } 489 490 static int acpi_pcc_init_input(struct pcc_acpi *pcc) 491 { 492 struct input_dev *input_dev; 493 int error; 494 495 input_dev = input_allocate_device(); 496 if (!input_dev) { 497 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 498 "Couldn't allocate input device for hotkey")); 499 return -ENOMEM; 500 } 501 502 input_dev->name = ACPI_PCC_DRIVER_NAME; 503 input_dev->phys = ACPI_PCC_INPUT_PHYS; 504 input_dev->id.bustype = BUS_HOST; 505 input_dev->id.vendor = 0x0001; 506 input_dev->id.product = 0x0001; 507 input_dev->id.version = 0x0100; 508 509 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL); 510 if (error) { 511 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 512 "Unable to setup input device keymap\n")); 513 goto err_free_dev; 514 } 515 516 error = input_register_device(input_dev); 517 if (error) { 518 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 519 "Unable to register input device\n")); 520 goto err_free_keymap; 521 } 522 523 pcc->input_dev = input_dev; 524 return 0; 525 526 err_free_keymap: 527 sparse_keymap_free(input_dev); 528 err_free_dev: 529 input_free_device(input_dev); 530 return error; 531 } 532 533 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc) 534 { 535 sparse_keymap_free(pcc->input_dev); 536 input_unregister_device(pcc->input_dev); 537 /* 538 * No need to input_free_device() since core input API refcounts 539 * and free()s the device. 540 */ 541 } 542 543 /* kernel module interface */ 544 545 #ifdef CONFIG_PM_SLEEP 546 static int acpi_pcc_hotkey_resume(struct device *dev) 547 { 548 struct pcc_acpi *pcc; 549 550 if (!dev) 551 return -EINVAL; 552 553 pcc = acpi_driver_data(to_acpi_device(dev)); 554 if (!pcc) 555 return -EINVAL; 556 557 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n", 558 pcc->sticky_mode)); 559 560 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode); 561 } 562 #endif 563 564 static int acpi_pcc_hotkey_add(struct acpi_device *device) 565 { 566 struct backlight_properties props; 567 struct pcc_acpi *pcc; 568 int num_sifr, result; 569 570 if (!device) 571 return -EINVAL; 572 573 num_sifr = acpi_pcc_get_sqty(device); 574 575 if (num_sifr < 0 || num_sifr > 255) { 576 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range")); 577 return -ENODEV; 578 } 579 580 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL); 581 if (!pcc) { 582 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 583 "Couldn't allocate mem for pcc")); 584 return -ENOMEM; 585 } 586 587 pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL); 588 if (!pcc->sinf) { 589 result = -ENOMEM; 590 goto out_hotkey; 591 } 592 593 pcc->device = device; 594 pcc->handle = device->handle; 595 pcc->num_sifr = num_sifr; 596 device->driver_data = pcc; 597 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME); 598 strcpy(acpi_device_class(device), ACPI_PCC_CLASS); 599 600 result = acpi_pcc_init_input(pcc); 601 if (result) { 602 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 603 "Error installing keyinput handler\n")); 604 goto out_sinf; 605 } 606 607 if (!acpi_pcc_retrieve_biosdata(pcc)) { 608 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 609 "Couldn't retrieve BIOS data\n")); 610 result = -EIO; 611 goto out_input; 612 } 613 /* initialize backlight */ 614 memset(&props, 0, sizeof(struct backlight_properties)); 615 props.type = BACKLIGHT_PLATFORM; 616 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT]; 617 pcc->backlight = backlight_device_register("panasonic", NULL, pcc, 618 &pcc_backlight_ops, &props); 619 if (IS_ERR(pcc->backlight)) { 620 result = PTR_ERR(pcc->backlight); 621 goto out_input; 622 } 623 624 /* read the initial brightness setting from the hardware */ 625 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT]; 626 627 /* read the initial sticky key mode from the hardware */ 628 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY]; 629 630 /* add sysfs attributes */ 631 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group); 632 if (result) 633 goto out_backlight; 634 635 return 0; 636 637 out_backlight: 638 backlight_device_unregister(pcc->backlight); 639 out_input: 640 acpi_pcc_destroy_input(pcc); 641 out_sinf: 642 kfree(pcc->sinf); 643 out_hotkey: 644 kfree(pcc); 645 646 return result; 647 } 648 649 static int __init acpi_pcc_init(void) 650 { 651 int result = 0; 652 653 if (acpi_disabled) 654 return -ENODEV; 655 656 result = acpi_bus_register_driver(&acpi_pcc_driver); 657 if (result < 0) { 658 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 659 "Error registering hotkey driver\n")); 660 return -ENODEV; 661 } 662 663 return 0; 664 } 665 666 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type) 667 { 668 struct pcc_acpi *pcc = acpi_driver_data(device); 669 670 if (!device || !pcc) 671 return -EINVAL; 672 673 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group); 674 675 backlight_device_unregister(pcc->backlight); 676 677 acpi_pcc_destroy_input(pcc); 678 679 kfree(pcc->sinf); 680 kfree(pcc); 681 682 return 0; 683 } 684 685 static void __exit acpi_pcc_exit(void) 686 { 687 acpi_bus_unregister_driver(&acpi_pcc_driver); 688 } 689 690 module_init(acpi_pcc_init); 691 module_exit(acpi_pcc_exit); 692