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         ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
 245
 246         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 247                                       &params, NULL);
 248
 249         return status == AE_OK;
 250 }
 251
 252 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 253 {
 254         unsigned long long s;
 255         acpi_status status;
 256
 257         ACPI_FUNCTION_TRACE("acpi_pcc_get_sqty");
 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, u32 *sinf)
 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         ACPI_FUNCTION_TRACE("acpi_pcc_retrieve_biosdata");
 278
 279         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, 0,
 280                                       &buffer);
 281         if (ACPI_FAILURE(status)) {
 282                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 283                                   "evaluation error HKEY.SINF\n"));
 284                 return 0;
 285         }
 286
 287         hkey = buffer.pointer;
 288         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 289                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 290                 goto end;
 291         }
 292
 293         if (pcc->num_sifr < hkey->package.count) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 295                                  "SQTY reports bad SINF length\n"));
 296                 status = AE_ERROR;
 297                 goto end;
 298         }
 299
 300         for (i = 0; i < hkey->package.count; i++) {
 301                 union acpi_object *element = &(hkey->package.elements[i]);
 302                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
 303                         sinf[i] = element->integer.value;
 304                 } else
 305                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 306                                          "Invalid HKEY.SINF data\n"));
 307         }
 308         sinf[hkey->package.count] = -1;
 309
 310 end:
 311         kfree(buffer.pointer);
 312         return status == AE_OK;
 313 }
 314
 315 /* backlight API interface functions */
 316
 317 /* This driver currently treats AC and DC brightness identical,
 318  * since we don't need to invent an interface to the core ACPI
 319  * logic to receive events in case a power supply is plugged in
 320  * or removed */
 321
 322 static int bl_get(struct backlight_device *bd)
 323 {
 324         struct pcc_acpi *pcc = bl_get_data(bd);
 325
 326         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 327                 return -EIO;
 328
 329         return pcc->sinf[SINF_AC_CUR_BRIGHT];
 330 }
 331
 332 static int bl_set_status(struct backlight_device *bd)
 333 {
 334         struct pcc_acpi *pcc = bl_get_data(bd);
 335         int bright = bd->props.brightness;
 336         int rc;
 337
 338         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 339                 return -EIO;
 340
 341         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
 342                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
 343
 344         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
 345                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
 346
 347         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
 348             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
 349                 return -EINVAL;
 350
 351         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
 352         if (rc < 0)
 353                 return rc;
 354
 355         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 356 }
 357
 358 static struct backlight_ops pcc_backlight_ops = {
 359         .get_brightness = bl_get,
 360         .update_status  = bl_set_status,
 361 };
 362
 363
 364 /* sysfs user interface functions */
 365
 366 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
 367                             char *buf)
 368 {
 369         struct acpi_device *acpi = to_acpi_device(dev);
 370         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 371
 372         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 373                 return -EIO;
 374
 375         return sprintf(buf, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
 376 }
 377
 378 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
 379                             char *buf)
 380 {
 381         struct acpi_device *acpi = to_acpi_device(dev);
 382         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 383
 384         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 385                 return -EIO;
 386
 387         return sprintf(buf, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
 388 }
 389
 390 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
 391                          char *buf)
 392 {
 393         struct acpi_device *acpi = to_acpi_device(dev);
 394         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 395
 396         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 397                 return -EIO;
 398
 399         return sprintf(buf, "%u\n", pcc->sinf[SINF_MUTE]);
 400 }
 401
 402 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
 403                            char *buf)
 404 {
 405         struct acpi_device *acpi = to_acpi_device(dev);
 406         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 407
 408         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf))
 409                 return -EIO;
 410
 411         return sprintf(buf, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
 412 }
 413
 414 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
 415                           const char *buf, size_t count)
 416 {
 417         struct acpi_device *acpi = to_acpi_device(dev);
 418         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 419         int val;
 420
 421         if (count && sscanf(buf, "%i", &val) == 1 &&
 422             (val == 0 || val == 1)) {
 423                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
 424                 pcc->sticky_mode = val;
 425         }
 426
 427         return count;
 428 }
 429
 430 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
 431 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
 432 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
 433 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
 434
 435 static struct attribute *pcc_sysfs_entries[] = {
 436         &dev_attr_numbatt.attr,
 437         &dev_attr_lcdtype.attr,
 438         &dev_attr_mute.attr,
 439         &dev_attr_sticky_key.attr,
 440         NULL,
 441 };
 442
 443 static struct attribute_group pcc_attr_group = {
 444         .name   = NULL,         /* put in device directory */
 445         .attrs  = pcc_sysfs_entries,
 446 };
 447
 448
 449 /* hotkey input device driver */
 450
 451 static int pcc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 452 {
 453         struct pcc_acpi *pcc = input_get_drvdata(dev);
 454
 455         if (scancode >= ARRAY_SIZE(pcc->keymap))
 456                 return -EINVAL;
 457
 458         *keycode = pcc->keymap[scancode];
 459
 460         return 0;
 461 }
 462
 463 static int keymap_get_by_keycode(struct pcc_acpi *pcc, int keycode)
 464 {
 465         int i;
 466
 467         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++) {
 468                 if (pcc->keymap[i] == keycode)
 469                         return i+1;
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int pcc_setkeycode(struct input_dev *dev, int scancode, int keycode)
 476 {
 477         struct pcc_acpi *pcc = input_get_drvdata(dev);
 478         int oldkeycode;
 479
 480         if (scancode >= ARRAY_SIZE(pcc->keymap))
 481                 return -EINVAL;
 482
 483         if (keycode < 0 || keycode > KEY_MAX)
 484                 return -EINVAL;
 485
 486         oldkeycode = pcc->keymap[scancode];
 487         pcc->keymap[scancode] = keycode;
 488
 489         set_bit(keycode, dev->keybit);
 490
 491         if (!keymap_get_by_keycode(pcc, oldkeycode))
 492                 clear_bit(oldkeycode, dev->keybit);
 493
 494         return 0;
 495 }
 496
 497 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 498 {
 499         struct input_dev *hotk_input_dev = pcc->input_dev;
 500         int rc;
 501         int key_code, hkey_num;
 502         unsigned long long result;
 503
 504         ACPI_FUNCTION_TRACE("acpi_pcc_generate_keyinput");
 505
 506         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 507                                    NULL, &result);
 508         if (!ACPI_SUCCESS(rc)) {
 509                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 510                                  "error getting hotkey status\n"));
 511                 return;
 512         }
 513
 514         acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 515
 516         hkey_num = result & 0xf;
 517
 518         if (hkey_num < 0 || hkey_num > ARRAY_SIZE(pcc->keymap)) {
 519                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 520                                   "hotkey number out of range: %d\n",
 521                                   hkey_num));
 522                 return;
 523         }
 524
 525         key_code = pcc->keymap[hkey_num];
 526
 527         if (key_code != KEY_RESERVED) {
 528                 int pushed = (result & 0x80) ? TRUE : FALSE;
 529
 530                 input_report_key(hotk_input_dev, key_code, pushed);
 531                 input_sync(hotk_input_dev);
 532         }
 533
 534         return;
 535 }
 536
 537 static void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
 538 {
 539         struct pcc_acpi *pcc = (struct pcc_acpi *) data;
 540
 541         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_notify");
 542
 543         switch (event) {
 544         case HKEY_NOTIFY:
 545                 acpi_pcc_generate_keyinput(pcc);
 546                 break;
 547         default:
 548                 /* nothing to do */
 549                 break;
 550         }
 551 }
 552
 553 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 554 {
 555         int i, rc;
 556
 557         ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
 558
 559         pcc->input_dev = input_allocate_device();
 560         if (!pcc->input_dev) {
 561                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 562                                   "Couldn't allocate input device for hotkey"));
 563                 return -ENOMEM;
 564         }
 565
 566         pcc->input_dev->evbit[0] = BIT(EV_KEY);
 567
 568         pcc->input_dev->name = ACPI_PCC_DRIVER_NAME;
 569         pcc->input_dev->phys = ACPI_PCC_INPUT_PHYS;
 570         pcc->input_dev->id.bustype = BUS_HOST;
 571         pcc->input_dev->id.vendor = 0x0001;
 572         pcc->input_dev->id.product = 0x0001;
 573         pcc->input_dev->id.version = 0x0100;
 574         pcc->input_dev->getkeycode = pcc_getkeycode;
 575         pcc->input_dev->setkeycode = pcc_setkeycode;
 576
 577         /* load initial keymap */
 578         memcpy(pcc->keymap, initial_keymap, sizeof(pcc->keymap));
 579
 580         for (i = 0; i < ARRAY_SIZE(pcc->keymap); i++)
 581                 __set_bit(pcc->keymap[i], pcc->input_dev->keybit);
 582         __clear_bit(KEY_RESERVED, pcc->input_dev->keybit);
 583
 584         input_set_drvdata(pcc->input_dev, pcc);
 585
 586         rc = input_register_device(pcc->input_dev);
 587         if (rc < 0)
 588                 input_free_device(pcc->input_dev);
 589
 590         return rc;
 591 }
 592
 593 /* kernel module interface */
 594
 595 static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 596 {
 597         struct pcc_acpi *pcc = acpi_driver_data(device);
 598         acpi_status status = AE_OK;
 599
 600         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
 601
 602         if (device == NULL || pcc == NULL)
 603                 return -EINVAL;
 604
 605         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 606                           pcc->sticky_mode));
 607
 608         status = acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 609
 610         return status == AE_OK ? 0 : -EINVAL;
 611 }
 612
 613 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 614 {
 615         acpi_status status;
 616         struct pcc_acpi *pcc;
 617         int num_sifr, result;
 618
 619         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
 620
 621         if (!device)
 622                 return -EINVAL;
 623
 624         num_sifr = acpi_pcc_get_sqty(device);
 625
 626         if (num_sifr > 255) {
 627                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
 628                 return -ENODEV;
 629         }
 630
 631         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 632         if (!pcc) {
 633                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 634                                   "Couldn't allocate mem for pcc"));
 635                 return -ENOMEM;
 636         }
 637
 638         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 639         if (!pcc->sinf) {
 640                 result = -ENOMEM;
 641                 goto out_hotkey;
 642         }
 643
 644         pcc->device = device;
 645         pcc->handle = device->handle;
 646         pcc->num_sifr = num_sifr;
 647         device->driver_data = pcc;
 648         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 649         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 650
 651         result = acpi_pcc_init_input(pcc);
 652         if (result) {
 653                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 654                                   "Error installing keyinput handler\n"));
 655                 goto out_sinf;
 656         }
 657
 658         /* initialize hotkey input device */
 659         status = acpi_install_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 660                                              acpi_pcc_hotkey_notify, pcc);
 661
 662         if (ACPI_FAILURE(status)) {
 663                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 664                                   "Error installing notify handler\n"));
 665                 result = -ENODEV;
 666                 goto out_input;
 667         }
 668
 669         /* initialize backlight */
 670         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 671                                                    &pcc_backlight_ops);
 672         if (IS_ERR(pcc->backlight))
 673                 goto out_notify;
 674
 675         if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
 676                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 677                                  "Couldn't retrieve BIOS data\n"));
 678                 goto out_backlight;
 679         }
 680
 681         /* read the initial brightness setting from the hardware */
 682         pcc->backlight->props.max_brightness =
 683                                         pcc->sinf[SINF_AC_MAX_BRIGHT];
 684         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 685
 686         /* read the initial sticky key mode from the hardware */
 687         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 688
 689         /* add sysfs attributes */
 690         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 691         if (result)
 692                 goto out_backlight;
 693
 694         return 0;
 695
 696 out_backlight:
 697         backlight_device_unregister(pcc->backlight);
 698 out_notify:
 699         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 700                                    acpi_pcc_hotkey_notify);
 701 out_input:
 702         input_unregister_device(pcc->input_dev);
 703         /* no need to input_free_device() since core input API refcount and
 704          * free()s the device */
 705 out_sinf:
 706         kfree(pcc->sinf);
 707 out_hotkey:
 708         kfree(pcc);
 709
 710         return result;
 711 }
 712
 713 static int __init acpi_pcc_init(void)
 714 {
 715         int result = 0;
 716
 717         ACPI_FUNCTION_TRACE("acpi_pcc_init");
 718
 719         if (acpi_disabled)
 720                 return -ENODEV;
 721
 722         result = acpi_bus_register_driver(&acpi_pcc_driver);
 723         if (result < 0) {
 724                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 725                                   "Error registering hotkey driver\n"));
 726                 return -ENODEV;
 727         }
 728
 729         return 0;
 730 }
 731
 732 static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 733 {
 734         struct pcc_acpi *pcc = acpi_driver_data(device);
 735
 736         ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
 737
 738         if (!device || !pcc)
 739                 return -EINVAL;
 740
 741         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 742
 743         backlight_device_unregister(pcc->backlight);
 744
 745         acpi_remove_notify_handler(pcc->handle, ACPI_DEVICE_NOTIFY,
 746                                    acpi_pcc_hotkey_notify);
 747
 748         input_unregister_device(pcc->input_dev);
 749         /* no need to input_free_device() since core input API refcount and
 750          * free()s the device */
 751
 752         kfree(pcc->sinf);
 753         kfree(pcc);
 754
 755         return 0;
 756 }
 757
 758 static void __exit acpi_pcc_exit(void)
 759 {
 760         ACPI_FUNCTION_TRACE("acpi_pcc_exit");
 761
 762         acpi_bus_unregister_driver(&acpi_pcc_driver);
 763 }
 764
 765 module_init(acpi_pcc_init);
 766 module_exit(acpi_pcc_exit);