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);
 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                                       &params, 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         if (!sparse_keymap_report_event(hotk_input_dev,
 468                                         result & 0xf, result & 0x80, false))
 469                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 470                                   "Unknown hotkey event: %d\n", result));
 471 }
 472
 473 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 474 {
 475         struct pcc_acpi *pcc = acpi_driver_data(device);
 476
 477         switch (event) {
 478         case HKEY_NOTIFY:
 479                 acpi_pcc_generate_keyinput(pcc);
 480                 break;
 481         default:
 482                 /* nothing to do */
 483                 break;
 484         }
 485 }
 486
 487 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 488 {
 489         struct input_dev *input_dev;
 490         int error;
 491
 492         input_dev = input_allocate_device();
 493         if (!input_dev)
 494                 return -ENOMEM;
 495
 496         input_dev->name = ACPI_PCC_DRIVER_NAME;
 497         input_dev->phys = ACPI_PCC_INPUT_PHYS;
 498         input_dev->id.bustype = BUS_HOST;
 499         input_dev->id.vendor = 0x0001;
 500         input_dev->id.product = 0x0001;
 501         input_dev->id.version = 0x0100;
 502
 503         error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
 504         if (error) {
 505                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 506                                   "Unable to setup input device keymap\n"));
 507                 goto err_free_dev;
 508         }
 509
 510         error = input_register_device(input_dev);
 511         if (error) {
 512                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 513                                   "Unable to register input device\n"));
 514                 goto err_free_keymap;
 515         }
 516
 517         pcc->input_dev = input_dev;
 518         return 0;
 519
 520  err_free_keymap:
 521         sparse_keymap_free(input_dev);
 522  err_free_dev:
 523         input_free_device(input_dev);
 524         return error;
 525 }
 526
 527 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
 528 {
 529         sparse_keymap_free(pcc->input_dev);
 530         input_unregister_device(pcc->input_dev);
 531         /*
 532          * No need to input_free_device() since core input API refcounts
 533          * and free()s the device.
 534          */
 535 }
 536
 537 /* kernel module interface */
 538
 539 #ifdef CONFIG_PM_SLEEP
 540 static int acpi_pcc_hotkey_resume(struct device *dev)
 541 {
 542         struct pcc_acpi *pcc;
 543
 544         if (!dev)
 545                 return -EINVAL;
 546
 547         pcc = acpi_driver_data(to_acpi_device(dev));
 548         if (!pcc)
 549                 return -EINVAL;
 550
 551         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 552                           pcc->sticky_mode));
 553
 554         return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 555 }
 556 #endif
 557
 558 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 559 {
 560         struct backlight_properties props;
 561         struct pcc_acpi *pcc;
 562         int num_sifr, result;
 563
 564         if (!device)
 565                 return -EINVAL;
 566
 567         num_sifr = acpi_pcc_get_sqty(device);
 568
 569         if (num_sifr < 0 || num_sifr > 255) {
 570                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
 571                 return -ENODEV;
 572         }
 573
 574         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 575         if (!pcc) {
 576                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 577                                   "Couldn't allocate mem for pcc"));
 578                 return -ENOMEM;
 579         }
 580
 581         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 582         if (!pcc->sinf) {
 583                 result = -ENOMEM;
 584                 goto out_hotkey;
 585         }
 586
 587         pcc->device = device;
 588         pcc->handle = device->handle;
 589         pcc->num_sifr = num_sifr;
 590         device->driver_data = pcc;
 591         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 592         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 593
 594         result = acpi_pcc_init_input(pcc);
 595         if (result) {
 596                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 597                                   "Error installing keyinput handler\n"));
 598                 goto out_sinf;
 599         }
 600
 601         if (!acpi_pcc_retrieve_biosdata(pcc)) {
 602                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 603                                  "Couldn't retrieve BIOS data\n"));
 604                 result = -EIO;
 605                 goto out_input;
 606         }
 607         /* initialize backlight */
 608         memset(&props, 0, sizeof(struct backlight_properties));
 609         props.type = BACKLIGHT_PLATFORM;
 610         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 611         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 612                                                    &pcc_backlight_ops, &props);
 613         if (IS_ERR(pcc->backlight)) {
 614                 result = PTR_ERR(pcc->backlight);
 615                 goto out_input;
 616         }
 617
 618         /* read the initial brightness setting from the hardware */
 619         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 620
 621         /* read the initial sticky key mode from the hardware */
 622         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 623
 624         /* add sysfs attributes */
 625         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 626         if (result)
 627                 goto out_backlight;
 628
 629         return 0;
 630
 631 out_backlight:
 632         backlight_device_unregister(pcc->backlight);
 633 out_input:
 634         acpi_pcc_destroy_input(pcc);
 635 out_sinf:
 636         kfree(pcc->sinf);
 637 out_hotkey:
 638         kfree(pcc);
 639
 640         return result;
 641 }
 642
 643 static int acpi_pcc_hotkey_remove(struct acpi_device *device)
 644 {
 645         struct pcc_acpi *pcc = acpi_driver_data(device);
 646
 647         if (!device || !pcc)
 648                 return -EINVAL;
 649
 650         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 651
 652         backlight_device_unregister(pcc->backlight);
 653
 654         acpi_pcc_destroy_input(pcc);
 655
 656         kfree(pcc->sinf);
 657         kfree(pcc);
 658
 659         return 0;
 660 }
 661
 662 module_acpi_driver(acpi_pcc_driver);