drivers/platform/x86/panasonic-laptop.c

   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                                       &params, 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.type = BACKLIGHT_PLATFORM;
 606         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 607         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 608                                                    &pcc_backlight_ops, &props);
 609         if (IS_ERR(pcc->backlight)) {
 610                 result = PTR_ERR(pcc->backlight);
 611                 goto out_input;
 612         }
 613
 614         /* read the initial brightness setting from the hardware */
 615         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 616
 617         /* read the initial sticky key mode from the hardware */
 618         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 619
 620         /* add sysfs attributes */
 621         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 622         if (result)
 623                 goto out_backlight;
 624
 625         return 0;
 626
 627 out_backlight:
 628         backlight_device_unregister(pcc->backlight);
 629 out_input:
 630         acpi_pcc_destroy_input(pcc);
 631 out_sinf:
 632         kfree(pcc->sinf);
 633 out_hotkey:
 634         kfree(pcc);
 635
 636         return result;
 637 }
 638
 639 static int __init acpi_pcc_init(void)
 640 {
 641         int result = 0;
 642
 643         if (acpi_disabled)
 644                 return -ENODEV;
 645
 646         result = acpi_bus_register_driver(&acpi_pcc_driver);
 647         if (result < 0) {
 648                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 649                                   "Error registering hotkey driver\n"));
 650                 return -ENODEV;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 657 {
 658         struct pcc_acpi *pcc = acpi_driver_data(device);
 659
 660         if (!device || !pcc)
 661                 return -EINVAL;
 662
 663         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 664
 665         backlight_device_unregister(pcc->backlight);
 666
 667         acpi_pcc_destroy_input(pcc);
 668
 669         kfree(pcc->sinf);
 670         kfree(pcc);
 671
 672         return 0;
 673 }
 674
 675 static void __exit acpi_pcc_exit(void)
 676 {
 677         acpi_bus_unregister_driver(&acpi_pcc_driver);
 678 }
 679
 680 module_init(acpi_pcc_init);
 681 module_exit(acpi_pcc_exit);