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 struct pcc_keyinput { 232 struct acpi_hotkey *hotkey; 233 }; 234 235 /* method access functions */ 236 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val) 237 { 238 union acpi_object in_objs[] = { 239 { .integer.type = ACPI_TYPE_INTEGER, 240 .integer.value = func, }, 241 { .integer.type = ACPI_TYPE_INTEGER, 242 .integer.value = val, }, 243 }; 244 struct acpi_object_list params = { 245 .count = ARRAY_SIZE(in_objs), 246 .pointer = in_objs, 247 }; 248 acpi_status status = AE_OK; 249 250 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET, 251 ¶ms, NULL); 252 253 return (status == AE_OK) ? 0 : -EIO; 254 } 255 256 static inline int acpi_pcc_get_sqty(struct acpi_device *device) 257 { 258 unsigned long long s; 259 acpi_status status; 260 261 status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY, 262 NULL, &s); 263 if (ACPI_SUCCESS(status)) 264 return s; 265 else { 266 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 267 "evaluation error HKEY.SQTY\n")); 268 return -EINVAL; 269 } 270 } 271 272 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc) 273 { 274 acpi_status status; 275 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 276 union acpi_object *hkey = NULL; 277 int i; 278 279 status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL, 280 &buffer); 281 if (ACPI_FAILURE(status)) { 282 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 283 "evaluation error HKEY.SINF\n")); 284 return 0; 285 } 286 287 hkey = buffer.pointer; 288 if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) { 289 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n")); 290 status = AE_ERROR; 291 goto end; 292 } 293 294 if (pcc->num_sifr < hkey->package.count) { 295 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 296 "SQTY reports bad SINF length\n")); 297 status = AE_ERROR; 298 goto end; 299 } 300 301 for (i = 0; i < hkey->package.count; i++) { 302 union acpi_object *element = &(hkey->package.elements[i]); 303 if (likely(element->type == ACPI_TYPE_INTEGER)) { 304 pcc->sinf[i] = element->integer.value; 305 } else 306 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 307 "Invalid HKEY.SINF data\n")); 308 } 309 pcc->sinf[hkey->package.count] = -1; 310 311 end: 312 kfree(buffer.pointer); 313 return status == AE_OK; 314 } 315 316 /* backlight API interface functions */ 317 318 /* This driver currently treats AC and DC brightness identical, 319 * since we don't need to invent an interface to the core ACPI 320 * logic to receive events in case a power supply is plugged in 321 * or removed */ 322 323 static int bl_get(struct backlight_device *bd) 324 { 325 struct pcc_acpi *pcc = bl_get_data(bd); 326 327 if (!acpi_pcc_retrieve_biosdata(pcc)) 328 return -EIO; 329 330 return pcc->sinf[SINF_AC_CUR_BRIGHT]; 331 } 332 333 static int bl_set_status(struct backlight_device *bd) 334 { 335 struct pcc_acpi *pcc = bl_get_data(bd); 336 int bright = bd->props.brightness; 337 int rc; 338 339 if (!acpi_pcc_retrieve_biosdata(pcc)) 340 return -EIO; 341 342 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT]) 343 bright = pcc->sinf[SINF_AC_MIN_BRIGHT]; 344 345 if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT]) 346 bright = pcc->sinf[SINF_DC_MIN_BRIGHT]; 347 348 if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] || 349 bright > pcc->sinf[SINF_AC_MAX_BRIGHT]) 350 return -EINVAL; 351 352 rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright); 353 if (rc < 0) 354 return rc; 355 356 return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright); 357 } 358 359 static const struct backlight_ops pcc_backlight_ops = { 360 .get_brightness = bl_get, 361 .update_status = bl_set_status, 362 }; 363 364 365 /* sysfs user interface functions */ 366 367 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr, 368 char *buf) 369 { 370 struct acpi_device *acpi = to_acpi_device(dev); 371 struct pcc_acpi *pcc = acpi_driver_data(acpi); 372 373 if (!acpi_pcc_retrieve_biosdata(pcc)) 374 return -EIO; 375 376 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]); 377 } 378 379 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr, 380 char *buf) 381 { 382 struct acpi_device *acpi = to_acpi_device(dev); 383 struct pcc_acpi *pcc = acpi_driver_data(acpi); 384 385 if (!acpi_pcc_retrieve_biosdata(pcc)) 386 return -EIO; 387 388 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]); 389 } 390 391 static ssize_t show_mute(struct device *dev, struct device_attribute *attr, 392 char *buf) 393 { 394 struct acpi_device *acpi = to_acpi_device(dev); 395 struct pcc_acpi *pcc = acpi_driver_data(acpi); 396 397 if (!acpi_pcc_retrieve_biosdata(pcc)) 398 return -EIO; 399 400 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]); 401 } 402 403 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr, 404 char *buf) 405 { 406 struct acpi_device *acpi = to_acpi_device(dev); 407 struct pcc_acpi *pcc = acpi_driver_data(acpi); 408 409 if (!acpi_pcc_retrieve_biosdata(pcc)) 410 return -EIO; 411 412 return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]); 413 } 414 415 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr, 416 const char *buf, size_t count) 417 { 418 struct acpi_device *acpi = to_acpi_device(dev); 419 struct pcc_acpi *pcc = acpi_driver_data(acpi); 420 int val; 421 422 if (count && sscanf(buf, "%i", &val) == 1 && 423 (val == 0 || val == 1)) { 424 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val); 425 pcc->sticky_mode = val; 426 } 427 428 return count; 429 } 430 431 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL); 432 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL); 433 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL); 434 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky); 435 436 static struct attribute *pcc_sysfs_entries[] = { 437 &dev_attr_numbatt.attr, 438 &dev_attr_lcdtype.attr, 439 &dev_attr_mute.attr, 440 &dev_attr_sticky_key.attr, 441 NULL, 442 }; 443 444 static struct attribute_group pcc_attr_group = { 445 .name = NULL, /* put in device directory */ 446 .attrs = pcc_sysfs_entries, 447 }; 448 449 450 /* hotkey input device driver */ 451 452 static int sleep_keydown_seen; 453 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc) 454 { 455 struct input_dev *hotk_input_dev = pcc->input_dev; 456 int rc; 457 unsigned long long result; 458 459 rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY, 460 NULL, &result); 461 if (!ACPI_SUCCESS(rc)) { 462 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 463 "error getting hotkey status\n")); 464 return; 465 } 466 467 /* hack: some firmware sends no key down for sleep / hibernate */ 468 if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) { 469 if (result & 0x80) 470 sleep_keydown_seen = 1; 471 if (!sleep_keydown_seen) 472 sparse_keymap_report_event(hotk_input_dev, 473 result & 0xf, 0x80, false); 474 } 475 476 if (!sparse_keymap_report_event(hotk_input_dev, 477 result & 0xf, result & 0x80, false)) 478 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 479 "Unknown hotkey event: %d\n", result)); 480 } 481 482 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event) 483 { 484 struct pcc_acpi *pcc = acpi_driver_data(device); 485 486 switch (event) { 487 case HKEY_NOTIFY: 488 acpi_pcc_generate_keyinput(pcc); 489 break; 490 default: 491 /* nothing to do */ 492 break; 493 } 494 } 495 496 static int acpi_pcc_init_input(struct pcc_acpi *pcc) 497 { 498 struct input_dev *input_dev; 499 int error; 500 501 input_dev = input_allocate_device(); 502 if (!input_dev) 503 return -ENOMEM; 504 505 input_dev->name = ACPI_PCC_DRIVER_NAME; 506 input_dev->phys = ACPI_PCC_INPUT_PHYS; 507 input_dev->id.bustype = BUS_HOST; 508 input_dev->id.vendor = 0x0001; 509 input_dev->id.product = 0x0001; 510 input_dev->id.version = 0x0100; 511 512 error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL); 513 if (error) { 514 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 515 "Unable to setup input device keymap\n")); 516 goto err_free_dev; 517 } 518 519 error = input_register_device(input_dev); 520 if (error) { 521 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 522 "Unable to register input device\n")); 523 goto err_free_keymap; 524 } 525 526 pcc->input_dev = input_dev; 527 return 0; 528 529 err_free_keymap: 530 sparse_keymap_free(input_dev); 531 err_free_dev: 532 input_free_device(input_dev); 533 return error; 534 } 535 536 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc) 537 { 538 sparse_keymap_free(pcc->input_dev); 539 input_unregister_device(pcc->input_dev); 540 /* 541 * No need to input_free_device() since core input API refcounts 542 * and free()s the device. 543 */ 544 } 545 546 /* kernel module interface */ 547 548 #ifdef CONFIG_PM_SLEEP 549 static int acpi_pcc_hotkey_resume(struct device *dev) 550 { 551 struct pcc_acpi *pcc; 552 553 if (!dev) 554 return -EINVAL; 555 556 pcc = acpi_driver_data(to_acpi_device(dev)); 557 if (!pcc) 558 return -EINVAL; 559 560 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n", 561 pcc->sticky_mode)); 562 563 return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode); 564 } 565 #endif 566 567 static int acpi_pcc_hotkey_add(struct acpi_device *device) 568 { 569 struct backlight_properties props; 570 struct pcc_acpi *pcc; 571 int num_sifr, result; 572 573 if (!device) 574 return -EINVAL; 575 576 num_sifr = acpi_pcc_get_sqty(device); 577 578 if (num_sifr < 0 || num_sifr > 255) { 579 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range")); 580 return -ENODEV; 581 } 582 583 pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL); 584 if (!pcc) { 585 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 586 "Couldn't allocate mem for pcc")); 587 return -ENOMEM; 588 } 589 590 pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL); 591 if (!pcc->sinf) { 592 result = -ENOMEM; 593 goto out_hotkey; 594 } 595 596 pcc->device = device; 597 pcc->handle = device->handle; 598 pcc->num_sifr = num_sifr; 599 device->driver_data = pcc; 600 strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME); 601 strcpy(acpi_device_class(device), ACPI_PCC_CLASS); 602 603 result = acpi_pcc_init_input(pcc); 604 if (result) { 605 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 606 "Error installing keyinput handler\n")); 607 goto out_sinf; 608 } 609 610 if (!acpi_pcc_retrieve_biosdata(pcc)) { 611 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 612 "Couldn't retrieve BIOS data\n")); 613 result = -EIO; 614 goto out_input; 615 } 616 /* initialize backlight */ 617 memset(&props, 0, sizeof(struct backlight_properties)); 618 props.type = BACKLIGHT_PLATFORM; 619 props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT]; 620 pcc->backlight = backlight_device_register("panasonic", NULL, pcc, 621 &pcc_backlight_ops, &props); 622 if (IS_ERR(pcc->backlight)) { 623 result = PTR_ERR(pcc->backlight); 624 goto out_input; 625 } 626 627 /* read the initial brightness setting from the hardware */ 628 pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT]; 629 630 /* read the initial sticky key mode from the hardware */ 631 pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY]; 632 633 /* add sysfs attributes */ 634 result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group); 635 if (result) 636 goto out_backlight; 637 638 return 0; 639 640 out_backlight: 641 backlight_device_unregister(pcc->backlight); 642 out_input: 643 acpi_pcc_destroy_input(pcc); 644 out_sinf: 645 kfree(pcc->sinf); 646 out_hotkey: 647 kfree(pcc); 648 649 return result; 650 } 651 652 static int acpi_pcc_hotkey_remove(struct acpi_device *device) 653 { 654 struct pcc_acpi *pcc = acpi_driver_data(device); 655 656 if (!device || !pcc) 657 return -EINVAL; 658 659 sysfs_remove_group(&device->dev.kobj, &pcc_attr_group); 660 661 backlight_device_unregister(pcc->backlight); 662 663 acpi_pcc_destroy_input(pcc); 664 665 kfree(pcc->sinf); 666 kfree(pcc); 667 668 return 0; 669 } 670 671 module_acpi_driver(acpi_pcc_driver); 672