drivers/misc/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/version.h>
 120 #include <linux/kernel.h>
 121 #include <linux/module.h>
 122 #include <linux/init.h>
 123 #include <linux/types.h>
 124 #include <linux/backlight.h>
 125 #include <linux/ctype.h>
 126 #include <linux/seq_file.h>
 127 #include <linux/uaccess.h>
 128 #include <acpi/acpi_bus.h>
 129 #include <acpi/acpi_drivers.h>
 130 #include <linux/input.h>
 131
 132
 133 #ifndef ACPI_HOTKEY_COMPONENT
 134 #define ACPI_HOTKEY_COMPONENT   0x10000000
 135 #endif
 136
 137 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
 138
 139 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
 140 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
 141 MODULE_LICENSE("GPL");
 142
 143 #define LOGPREFIX "pcc_acpi: "
 144
 145 /* Define ACPI PATHs */
 146 /* Lets note hotkeys */
 147 #define METHOD_HKEY_QUERY       "HINF"
 148 #define METHOD_HKEY_SQTY        "SQTY"
 149 #define METHOD_HKEY_SINF        "SINF"
 150 #define METHOD_HKEY_SSET        "SSET"
 151 #define HKEY_NOTIFY              0x80
 152
 153 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
 154 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
 155 #define ACPI_PCC_CLASS          "pcc"
 156
 157 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
 158
 159 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
 160    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
 161 */
 162 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 163                  SINF_LCD_TYPE,
 164                  SINF_AC_MAX_BRIGHT,
 165                  SINF_AC_MIN_BRIGHT,
 166                  SINF_AC_CUR_BRIGHT,
 167                  SINF_DC_MAX_BRIGHT,
 168                  SINF_DC_MIN_BRIGHT,
 169                  SINF_DC_CUR_BRIGHT,
 170                  SINF_MUTE,
 171                  SINF_RESERVED,
 172                  SINF_ENV_STATE,
 173                  SINF_STICKY_KEY = 0x80,
 174         };
 175 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
 176
 177 static int acpi_pcc_hotkey_add(struct acpi_device *device);
 178 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
 179 static int acpi_pcc_hotkey_resume(struct acpi_device *device);
 180
 181 static const struct acpi_device_id pcc_device_ids[] = {
 182         { "MAT0012", 0},
 183         { "MAT0013", 0},
 184         { "MAT0018", 0},
 185         { "MAT0019", 0},
 186         { "", 0},
 187 };
 188
 189 static struct acpi_driver acpi_pcc_driver = {
 190         .name =         ACPI_PCC_DRIVER_NAME,
 191         .class =        ACPI_PCC_CLASS,
 192         .ids =          pcc_device_ids,
 193         .ops =          {
 194                                 .add =          acpi_pcc_hotkey_add,
 195                                 .remove =       acpi_pcc_hotkey_remove,
 196                                 .resume =       acpi_pcc_hotkey_resume,
 197                         },
 198 };
 199
 200 #define KEYMAP_SIZE             11
 201 static const int initial_keymap[KEYMAP_SIZE] = {
 202         /*  0 */ KEY_RESERVED,
 203         /*  1 */ KEY_BRIGHTNESSDOWN,
 204         /*  2 */ KEY_BRIGHTNESSUP,
 205         /*  3 */ KEY_DISPLAYTOGGLE,
 206         /*  4 */ KEY_MUTE,
 207         /*  5 */ KEY_VOLUMEDOWN,
 208         /*  6 */ KEY_VOLUMEUP,
 209         /*  7 */ KEY_SLEEP,
 210         /*  8 */ KEY_PROG1, /* Change CPU boost */
 211         /*  9 */ KEY_BATTERY,
 212         /* 10 */ KEY_SUSPEND,
 213 };
 214
 215 struct pcc_acpi {
 216         acpi_handle             handle;
 217         unsigned long           num_sifr;
 218         int                     sticky_mode;
 219         u32                     *sinf;
 220         struct acpi_device      *device;
 221         struct input_dev        *input_dev;
 222         struct backlight_device *backlight;
 223         int                     keymap[KEYMAP_SIZE];
 224 };
 225
 226 struct pcc_keyinput {
 227         struct acpi_hotkey      *hotkey;
 228 };
 229
 230 /* method access functions */
 231 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 232 {
 233         union acpi_object in_objs[] = {
 234                 { .integer.type  = ACPI_TYPE_INTEGER,
 235                   .integer.value = func, },
 236                 { .integer.type  = ACPI_TYPE_INTEGER,
 237                   .integer.value = val, },
 238         };
 239         struct acpi_object_list params = {
 240                 .count   = ARRAY_SIZE(in_objs),
 241                 .pointer = in_objs,
 242         };
 243         acpi_status status = AE_OK;
 244
 245         ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
 246
 247         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 248                                       &params, NULL);
 249
 250         return status == AE_OK;
 251 }
 252
 253 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 254 {
 255         unsigned long long s;
 256         acpi_status status;
 257
 258         ACPI_FUNCTION_TRACE("acpi_pcc_get_sqty");
 259
 260         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
 261                                        NULL, &s);
 262         if (ACPI_SUCCESS(status))
 263                 return s;
 264         else {
 265                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 266                                   "evaluation error HKEY.SQTY\n"));
 267                 return -EINVAL;
 268         }
 269 }
 270
 271 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc, u32 *sinf)
 272 {
 273         acpi_status status;
 274         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 275         union acpi_object *hkey = NULL;
 276         int i;
 277
 278         ACPI_FUNCTION_TRACE("acpi_pcc_retrieve_biosdata");
 279
 280         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
 281                                       &buffer);
 282         if (ACPI_FAILURE(status)) {
 283                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 284                                   "evaluation error HKEY.SINF\n"));
 285                 return 0;
 286         }
 287
 288         hkey = buffer.pointer;
 289         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 290                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 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                         sinf[i] = element->integer.value;
 305                 } else
 306                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 307                                          "Invalid HKEY.SINF data\n"));
 308         }
 309         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, pcc->sinf))
 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, pcc->sinf))
 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 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, pcc->sinf))
 374                 return -EIO;
 375
 376         return sprintf(buf, "%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, pcc->sinf))
 386                 return -EIO;
 387
 388         return sprintf(buf, "%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, pcc->sinf))
 398                 return -EIO;
 399
 400         return sprintf(buf, "%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, pcc->sinf))
 410                 return -EIO;
 411
 412         return sprintf(buf, "%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 pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 453 {
 454         struct pcc_acpi *pcc = input_get_drvdata(dev);
 455
 456         if (scancode >= ARRAY_SIZE(pcc->keymap))
 457                 return -EINVAL;
 458
 459         *keycode = pcc->keymap[scancode];
 460
 461         return 0;
 462 }
 463
 464 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
 465 {
 466         int i;
 467
 468         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
 469                 if (pcc->keymap[i] == keycode)
 470                         return i+1;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
 477 {
 478         struct pcc_acpi *pcc = input_get_drvdata(dev);
 479         int oldkeycode;
 480
 481         if (scancode >= ARRAY_SIZE(pcc->keymap))
 482                 return -EINVAL;
 483
 484         if (keycode < 0 || keycode > KEY_MAX)
 485                 return -EINVAL;
 486
 487         oldkeycode = pcc->keymap[scancode];
 488         pcc->keymap[scancode] = keycode;
 489
 490         set_bit(keycode, dev->keybit);
 491
 492         if (!keymap_get_by_keycode(pcc, oldkeycode))
 493                 clear_bit(oldkeycode, dev->keybit);
 494
 495         return 0;
 496 }
 497
 498 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 499 {
 500         struct input_dev *hotk_input_dev = pcc->input_dev;
 501         int rc;
 502         int key_code, hkey_num;
 503         unsigned long long result;
 504
 505         ACPI_FUNCTION_TRACE("acpi_pcc_generate_keyinput");
 506
 507         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 508                                    NULL, &result);
 509         if (!ACPI_SUCCESS(rc)) {
 510                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 511                                  "error getting hotkey status\n"));
 512                 return;
 513         }
 514
 515         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 516
 517         hkey_num = result & 0xf;
 518
 519         if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
 520                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 521                                   "hotkey number out of range: %d\n",
 522                                   hkey_num));
 523                 return;
 524         }
 525
 526         key_code = pcc->keymap[hkey_num];
 527
 528         if (key_code != KEY_RESERVED) {
 529                 int pushed = (result & 0x80) ? TRUE : FALSE;
 530
 531                 input_report_key(hotk_input_dev, key_code, pushed);
 532                 input_sync(hotk_input_dev);
 533         }
 534
 535         return;
 536 }
 537
 538 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
 539 {
 540         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
 541
 542         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_notify");
 543
 544         switch (event) {
 545         case HKEY_NOTIFY:
 546                 acpi_pcc_generate_keyinput(pcc);
 547                 break;
 548         default:
 549                 /* nothing to do */
 550                 break;
 551         }
 552 }
 553
 554 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 555 {
 556         int i, rc;
 557
 558         ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
 559
 560         pcc->input_dev = input_allocate_device();
 561         if (!pcc->input_dev) {
 562                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 563                                   "Couldn't allocate input device for hotkey"));
 564                 return -ENOMEM;
 565         }
 566
 567         pcc->input_dev->evbit[0] = BIT(EV_KEY);
 568
 569         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
 570         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
 571         pcc->input_dev->id.bustype = BUS_HOST;
 572         pcc->input_dev->id.vendor = 0x0001;
 573         pcc->input_dev->id.product = 0x0001;
 574         pcc->input_dev->id.version = 0x0100;
 575         pcc->input_dev->getkeycode = pcc_getkeycode;
 576         pcc->input_dev->setkeycode = pcc_setkeycode;
 577
 578         /* load initial keymap */
 579         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
 580
 581         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
 582                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
 583         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
 584
 585         input_set_drvdata(pcc->input_dev, pcc);
 586
 587         rc = input_register_device(pcc->input_dev);
 588         if (rc < 0)
 589                 input_free_device(pcc->input_dev);
 590
 591         return rc;
 592 }
 593
 594 /* kernel module interface */
 595
 596 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 597 {
 598         struct pcc_acpi *pcc = acpi_driver_data(device);
 599         acpi_status status = AE_OK;
 600
 601         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
 602
 603         if (device == NULL || pcc == NULL)
 604                 return -EINVAL;
 605
 606         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 607                           pcc->sticky_mode));
 608
 609         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 610
 611         return status == AE_OK ? 0 : -EINVAL;
 612 }
 613
 614 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 615 {
 616         acpi_status status;
 617         struct pcc_acpi *pcc;
 618         int num_sifr, result;
 619
 620         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
 621
 622         if (!device)
 623                 return -EINVAL;
 624
 625         num_sifr = acpi_pcc_get_sqty(device);
 626
 627         if (num_sifr > 255) {
 628                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
 629                 return -ENODEV;
 630         }
 631
 632         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 633         if (!pcc) {
 634                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 635                                   "Couldn't allocate mem for pcc"));
 636                 return -ENOMEM;
 637         }
 638
 639         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 640         if (!pcc->sinf) {
 641                 result = -ENOMEM;
 642                 goto out_hotkey;
 643         }
 644
 645         pcc->device = device;
 646         pcc->handle = device->handle;
 647         pcc->num_sifr = num_sifr;
 648         device->driver_data = pcc;
 649         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 650         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 651
 652         result = acpi_pcc_init_input(pcc);
 653         if (result) {
 654                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 655                                   "Error installing keyinput handler\n"));
 656                 goto out_sinf;
 657         }
 658
 659         /* initialize hotkey input device */
 660         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 661                                              acpi_pcc_hotkey_notify, pcc);
 662
 663         if (ACPI_FAILURE(status)) {
 664                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 665                                   "Error installing notify handler\n"));
 666                 result = -ENODEV;
 667                 goto out_input;
 668         }
 669
 670         /* initialize backlight */
 671         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 672                                                    &pcc_backlight_ops);
 673         if (IS_ERR(pcc->backlight))
 674                 goto out_notify;
 675
 676         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 677                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 678                                  "Couldn't retrieve BIOS data\n"));
 679                 goto out_backlight;
 680         }
 681
 682         /* read the initial brightness setting from the hardware */
 683         pcc->backlight->props.max_brightness =
 684                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
 685         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 686
 687         /* read the initial sticky key mode from the hardware */
 688         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 689
 690         /* add sysfs attributes */
 691         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 692         if (result)
 693                 goto out_backlight;
 694
 695         return 0;
 696
 697 out_backlight:
 698         backlight_device_unregister(pcc->backlight);
 699 out_notify:
 700         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 701                                    acpi_pcc_hotkey_notify);
 702 out_input:
 703         input_unregister_device(pcc->input_dev);
 704         /* no need to input_free_device() since core input API refcount and
 705          * free()s the device */
 706 out_sinf:
 707         kfree(pcc->sinf);
 708 out_hotkey:
 709         kfree(pcc);
 710
 711         return result;
 712 }
 713
 714 static int __init acpi_pcc_init(void)
 715 {
 716         int result = 0;
 717
 718         ACPI_FUNCTION_TRACE("acpi_pcc_init");
 719
 720         if (acpi_disabled)
 721                 return -ENODEV;
 722
 723         result = acpi_bus_register_driver(&acpi_pcc_driver);
 724         if (result < 0) {
 725                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 726                                   "Error registering hotkey driver\n"));
 727                 return -ENODEV;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 734 {
 735         struct pcc_acpi *pcc = acpi_driver_data(device);
 736
 737         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
 738
 739         if (!device || !pcc)
 740                 return -EINVAL;
 741
 742         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 743
 744         backlight_device_unregister(pcc->backlight);
 745
 746         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 747                                    acpi_pcc_hotkey_notify);
 748
 749         input_unregister_device(pcc->input_dev);
 750         /* no need to input_free_device() since core input API refcount and
 751          * free()s the device */
 752
 753         kfree(pcc->sinf);
 754         kfree(pcc);
 755
 756         return 0;
 757 }
 758
 759 static void __exit acpi_pcc_exit(void)
 760 {
 761         ACPI_FUNCTION_TRACE("acpi_pcc_exit");
 762
 763         acpi_bus_unregister_driver(&acpi_pcc_driver);
 764 }
 765
 766 module_init(acpi_pcc_init);
 767 module_exit(acpi_pcc_exit);