git.oblomov.eu Git - linux-2.6/blob - 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 <acpi/acpi_bus.h>
 128 #include <acpi/acpi_drivers.h>
 129 #include <linux/input.h>
 130
 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, int type);
 178 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
 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
 188 static struct acpi_driver acpi_pcc_driver = {
 189         .name =         ACPI_PCC_DRIVER_NAME,
 190         .class =        ACPI_PCC_CLASS,
 191         .ids =          pcc_device_ids,
 192         .ops =          {
 193                                 .add =          acpi_pcc_hotkey_add,
 194                                 .remove =       acpi_pcc_hotkey_remove,
 195                                 .resume =       acpi_pcc_hotkey_resume,
 196                         },
 197 };
 198
 199 #define KEYMAP_SIZE             11
 200 static const int initial_keymap[KEYMAP_SIZE] = {
 201         /*  0 */ KEY_RESERVED,
 202         /*  1 */ KEY_BRIGHTNESSDOWN,
 203         /*  2 */ KEY_BRIGHTNESSUP,
 204         /*  3 */ KEY_DISPLAYTOGGLE,
 205         /*  4 */ KEY_MUTE,
 206         /*  5 */ KEY_VOLUMEDOWN,
 207         /*  6 */ KEY_VOLUMEUP,
 208         /*  7 */ KEY_SLEEP,
 209         /*  8 */ KEY_PROG1, /* Change CPU boost */
 210         /*  9 */ KEY_BATTERY,
 211         /* 10 */ KEY_SUSPEND,
 212 };
 213
 214 struct pcc_acpi {
 215         acpi_handle             handle;
 216         unsigned long           num_sifr;
 217         int                     sticky_mode;
 218         u32                     *sinf;
 219         struct acpi_device      *device;
 220         struct input_dev        *input_dev;
 221         struct backlight_device *backlight;
 222         int                     keymap[KEYMAP_SIZE];
 223 };
 224
 225 struct pcc_keyinput {
 226         struct acpi_hotkey      *hotkey;
 227 };
 228
 229 /* method access functions */
 230 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 231 {
 232         union acpi_object in_objs[] = {
 233                 { .integer.type  = ACPI_TYPE_INTEGER,
 234                   .integer.value = func, },
 235                 { .integer.type  = ACPI_TYPE_INTEGER,
 236                   .integer.value = val, },
 237         };
 238         struct acpi_object_list params = {
 239                 .count   = ARRAY_SIZE(in_objs),
 240                 .pointer = in_objs,
 241         };
 242         acpi_status status = AE_OK;
 243
 244         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 245                                       &params, NULL);
 246
 247         return status == AE_OK;
 248 }
 249
 250 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 251 {
 252         unsigned long long s;
 253         acpi_status status;
 254
 255         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
 256                                        NULL, &s);
 257         if (ACPI_SUCCESS(status))
 258                 return s;
 259         else {
 260                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 261                                   "evaluation error HKEY.SQTY\n"));
 262                 return -EINVAL;
 263         }
 264 }
 265
 266 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
 267 {
 268         acpi_status status;
 269         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 270         union acpi_object *hkey = NULL;
 271         int i;
 272
 273         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
 274                                       &buffer);
 275         if (ACPI_FAILURE(status)) {
 276                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 277                                   "evaluation error HKEY.SINF\n"));
 278                 return 0;
 279         }
 280
 281         hkey = buffer.pointer;
 282         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 283                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 284                 goto end;
 285         }
 286
 287         if (pcc->num_sifr < hkey->package.count) {
 288                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 289                                  "SQTY reports bad SINF length\n"));
 290                 status = AE_ERROR;
 291                 goto end;
 292         }
 293
 294         for (i = 0; i < hkey->package.count; i++) {
 295                 union acpi_object *element = &(hkey->package.elements[i]);
 296                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
 297                         sinf[i] = element->integer.value;
 298                 } else
 299                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 300                                          "Invalid HKEY.SINF data\n"));
 301         }
 302         sinf[hkey->package.count] = -1;
 303
 304 end:
 305         kfree(buffer.pointer);
 306         return status == AE_OK;
 307 }
 308
 309 /* backlight API interface functions */
 310
 311 /* This driver currently treats AC and DC brightness identical,
 312  * since we don't need to invent an interface to the core ACPI
 313  * logic to receive events in case a power supply is plugged in
 314  * or removed */
 315
 316 static int bl_get(struct backlight_device *bd)
 317 {
 318         struct pcc_acpi *pcc = bl_get_data(bd);
 319
 320         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 321                 return -EIO;
 322
 323         return pcc->sinf[SINF_AC_CUR_BRIGHT];
 324 }
 325
 326 static int bl_set_status(struct backlight_device *bd)
 327 {
 328         struct pcc_acpi *pcc = bl_get_data(bd);
 329         int bright = bd->props.brightness;
 330         int rc;
 331
 332         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 333                 return -EIO;
 334
 335         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
 336                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
 337
 338         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
 339                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
 340
 341         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
 342             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
 343                 return -EINVAL;
 344
 345         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
 346         if (rc < 0)
 347                 return rc;
 348
 349         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 350 }
 351
 352 static struct backlight_ops pcc_backlight_ops = {
 353         .get_brightness = bl_get,
 354         .update_status  = bl_set_status,
 355 };
 356
 357
 358 /* sysfs user interface functions */
 359
 360 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
 361                             char *buf)
 362 {
 363         struct acpi_device *acpi = to_acpi_device(dev);
 364         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 365
 366         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 367                 return -EIO;
 368
 369         return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
 370 }
 371
 372 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
 373                             char *buf)
 374 {
 375         struct acpi_device *acpi = to_acpi_device(dev);
 376         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 377
 378         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 379                 return -EIO;
 380
 381         return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
 382 }
 383
 384 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
 385                          char *buf)
 386 {
 387         struct acpi_device *acpi = to_acpi_device(dev);
 388         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 389
 390         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 391                 return -EIO;
 392
 393         return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
 394 }
 395
 396 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
 397                            char *buf)
 398 {
 399         struct acpi_device *acpi = to_acpi_device(dev);
 400         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 401
 402         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 403                 return -EIO;
 404
 405         return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
 406 }
 407
 408 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
 409                           const char *buf, size_t count)
 410 {
 411         struct acpi_device *acpi = to_acpi_device(dev);
 412         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 413         int val;
 414
 415         if (count && sscanf(buf, "%i", &val) == 1 &&
 416             (val == 0 || val == 1)) {
 417                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
 418                 pcc->sticky_mode = val;
 419         }
 420
 421         return count;
 422 }
 423
 424 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
 425 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
 426 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
 427 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
 428
 429 static struct attribute *pcc_sysfs_entries[] = {
 430         &dev_attr_numbatt.attr,
 431         &dev_attr_lcdtype.attr,
 432         &dev_attr_mute.attr,
 433         &dev_attr_sticky_key.attr,
 434         NULL,
 435 };
 436
 437 static struct attribute_group pcc_attr_group = {
 438         .name   = NULL,         /* put in device directory */
 439         .attrs  = pcc_sysfs_entries,
 440 };
 441
 442
 443 /* hotkey input device driver */
 444
 445 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 446 {
 447         struct pcc_acpi *pcc = input_get_drvdata(dev);
 448
 449         if (scancode >= ARRAY_SIZE(pcc->keymap))
 450                 return -EINVAL;
 451
 452         *keycode = pcc->keymap[scancode];
 453
 454         return 0;
 455 }
 456
 457 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
 458 {
 459         int i;
 460
 461         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
 462                 if (pcc->keymap[i] == keycode)
 463                         return i+1;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
 470 {
 471         struct pcc_acpi *pcc = input_get_drvdata(dev);
 472         int oldkeycode;
 473
 474         if (scancode >= ARRAY_SIZE(pcc->keymap))
 475                 return -EINVAL;
 476
 477         if (keycode < 0 || keycode > KEY_MAX)
 478                 return -EINVAL;
 479
 480         oldkeycode = pcc->keymap[scancode];
 481         pcc->keymap[scancode] = keycode;
 482
 483         set_bit(keycode, dev->keybit);
 484
 485         if (!keymap_get_by_keycode(pcc, oldkeycode))
 486                 clear_bit(oldkeycode, dev->keybit);
 487
 488         return 0;
 489 }
 490
 491 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 492 {
 493         struct input_dev *hotk_input_dev = pcc->input_dev;
 494         int rc;
 495         int key_code, hkey_num;
 496         unsigned long long result;
 497
 498         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 499                                    NULL, &result);
 500         if (!ACPI_SUCCESS(rc)) {
 501                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 502                                  "error getting hotkey status\n"));
 503                 return;
 504         }
 505
 506         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 507
 508         hkey_num = result & 0xf;
 509
 510         if (hkey_num < 0 || hkey_num >= ARRAY_SIZE(pcc->keymap)) {
 511                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 512                                   "hotkey number out of range: %d\n",
 513                                   hkey_num));
 514                 return;
 515         }
 516
 517         key_code = pcc->keymap[hkey_num];
 518
 519         if (key_code != KEY_RESERVED) {
 520                 int pushed = (result & 0x80) ? TRUE : FALSE;
 521
 522                 input_report_key(hotk_input_dev, key_code, pushed);
 523                 input_sync(hotk_input_dev);
 524         }
 525
 526         return;
 527 }
 528
 529 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
 530 {
 531         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
 532
 533         switch (event) {
 534         case HKEY_NOTIFY:
 535                 acpi_pcc_generate_keyinput(pcc);
 536                 break;
 537         default:
 538                 /* nothing to do */
 539                 break;
 540         }
 541 }
 542
 543 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 544 {
 545         int i, rc;
 546
 547         pcc->input_dev = input_allocate_device();
 548         if (!pcc->input_dev) {
 549                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 550                                   "Couldn't allocate input device for hotkey"));
 551                 return -ENOMEM;
 552         }
 553
 554         pcc->input_dev->evbit[0] = BIT(EV_KEY);
 555
 556         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
 557         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
 558         pcc->input_dev->id.bustype = BUS_HOST;
 559         pcc->input_dev->id.vendor = 0x0001;
 560         pcc->input_dev->id.product = 0x0001;
 561         pcc->input_dev->id.version = 0x0100;
 562         pcc->input_dev->getkeycode = pcc_getkeycode;
 563         pcc->input_dev->setkeycode = pcc_setkeycode;
 564
 565         /* load initial keymap */
 566         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
 567
 568         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
 569                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
 570         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
 571
 572         input_set_drvdata(pcc->input_dev, pcc);
 573
 574         rc = input_register_device(pcc->input_dev);
 575         if (rc < 0)
 576                 input_free_device(pcc->input_dev);
 577
 578         return rc;
 579 }
 580
 581 /* kernel module interface */
 582
 583 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 584 {
 585         struct pcc_acpi *pcc = acpi_driver_data(device);
 586         acpi_status status = AE_OK;
 587
 588         if (device == NULL || pcc == NULL)
 589                 return -EINVAL;
 590
 591         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 592                           pcc->sticky_mode));
 593
 594         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 595
 596         return status == AE_OK ? 0 : -EINVAL;
 597 }
 598
 599 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 600 {
 601         acpi_status status;
 602         struct pcc_acpi *pcc;
 603         int num_sifr, result;
 604
 605         if (!device)
 606                 return -EINVAL;
 607
 608         num_sifr = acpi_pcc_get_sqty(device);
 609
 610         if (num_sifr > 255) {
 611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
 612                 return -ENODEV;
 613         }
 614
 615         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 616         if (!pcc) {
 617                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 618                                   "Couldn't allocate mem for pcc"));
 619                 return -ENOMEM;
 620         }
 621
 622         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 623         if (!pcc->sinf) {
 624                 result = -ENOMEM;
 625                 goto out_hotkey;
 626         }
 627
 628         pcc->device = device;
 629         pcc->handle = device->handle;
 630         pcc->num_sifr = num_sifr;
 631         device->driver_data = pcc;
 632         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 633         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 634
 635         result = acpi_pcc_init_input(pcc);
 636         if (result) {
 637                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 638                                   "Error installing keyinput handler\n"));
 639                 goto out_sinf;
 640         }
 641
 642         /* initialize hotkey input device */
 643         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 644                                              acpi_pcc_hotkey_notify, pcc);
 645
 646         if (ACPI_FAILURE(status)) {
 647                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 648                                   "Error installing notify handler\n"));
 649                 result = -ENODEV;
 650                 goto out_input;
 651         }
 652
 653         /* initialize backlight */
 654         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 655                                                    &pcc_backlight_ops);
 656         if (IS_ERR(pcc->backlight))
 657                 goto out_notify;
 658
 659         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 660                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 661                                  "Couldn't retrieve BIOS data\n"));
 662                 goto out_backlight;
 663         }
 664
 665         /* read the initial brightness setting from the hardware */
 666         pcc->backlight->props.max_brightness =
 667                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
 668         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 669
 670         /* read the initial sticky key mode from the hardware */
 671         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 672
 673         /* add sysfs attributes */
 674         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 675         if (result)
 676                 goto out_backlight;
 677
 678         return 0;
 679
 680 out_backlight:
 681         backlight_device_unregister(pcc->backlight);
 682 out_notify:
 683         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 684                                    acpi_pcc_hotkey_notify);
 685 out_input:
 686         input_unregister_device(pcc->input_dev);
 687         /* no need to input_free_device() since core input API refcount and
 688          * free()s the device */
 689 out_sinf:
 690         kfree(pcc->sinf);
 691 out_hotkey:
 692         kfree(pcc);
 693
 694         return result;
 695 }
 696
 697 static int __init acpi_pcc_init(void)
 698 {
 699         int result = 0;
 700
 701         if (acpi_disabled)
 702                 return -ENODEV;
 703
 704         result = acpi_bus_register_driver(&acpi_pcc_driver);
 705         if (result < 0) {
 706                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 707                                   "Error registering hotkey driver\n"));
 708                 return -ENODEV;
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 715 {
 716         struct pcc_acpi *pcc = acpi_driver_data(device);
 717
 718         if (!device || !pcc)
 719                 return -EINVAL;
 720
 721         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 722
 723         backlight_device_unregister(pcc->backlight);
 724
 725         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 726                                    acpi_pcc_hotkey_notify);
 727
 728         input_unregister_device(pcc->input_dev);
 729         /* no need to input_free_device() since core input API refcount and
 730          * free()s the device */
 731
 732         kfree(pcc->sinf);
 733         kfree(pcc);
 734
 735         return 0;
 736 }
 737
 738 static void __exit acpi_pcc_exit(void)
 739 {
 740         acpi_bus_unregister_driver(&acpi_pcc_driver);
 741 }
 742
 743 module_init(acpi_pcc_init);
 744 module_exit(acpi_pcc_exit);