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 <linux/acpi.h>
 129 #include <linux/input.h>
 130 #include <linux/input/sparse-keymap.h>
 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);
 178 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 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 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
 188
 189 #ifdef CONFIG_PM_SLEEP
 190 static int acpi_pcc_hotkey_resume(struct device *dev);
 191 #endif
 192 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
 193
 194 static struct acpi_driver acpi_pcc_driver = {
 195         .name =         ACPI_PCC_DRIVER_NAME,
 196         .class =        ACPI_PCC_CLASS,
 197         .ids =          pcc_device_ids,
 198         .ops =          {
 199                                 .add =          acpi_pcc_hotkey_add,
 200                                 .remove =       acpi_pcc_hotkey_remove,
 201                                 .notify =       acpi_pcc_hotkey_notify,
 202                         },
 203         .drv.pm =       &acpi_pcc_hotkey_pm,
 204 };
 205
 206 static const struct key_entry panasonic_keymap[] = {
 207         { KE_KEY, 0, { KEY_RESERVED } },
 208         { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
 209         { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
 210         { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
 211         { KE_KEY, 4, { KEY_MUTE } },
 212         { KE_KEY, 5, { KEY_VOLUMEDOWN } },
 213         { KE_KEY, 6, { KEY_VOLUMEUP } },
 214         { KE_KEY, 7, { KEY_SLEEP } },
 215         { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
 216         { KE_KEY, 9, { KEY_BATTERY } },
 217         { KE_KEY, 10, { KEY_SUSPEND } },
 218         { KE_END, 0 }
 219 };
 220
 221 struct pcc_acpi {
 222         acpi_handle             handle;
 223         unsigned long           num_sifr;
 224         int                     sticky_mode;
 225         u32                     *sinf;
 226         struct acpi_device      *device;
 227         struct input_dev        *input_dev;
 228         struct backlight_device *backlight;
 229 };
 230
 231 struct pcc_keyinput {
 232         struct acpi_hotkey      *hotkey;
 233 };
 234
 235 /* method access functions */
 236 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 237 {
 238         union acpi_object in_objs[] = {
 239                 { .integer.type  = ACPI_TYPE_INTEGER,
 240                   .integer.value = func, },
 241                 { .integer.type  = ACPI_TYPE_INTEGER,
 242                   .integer.value = val, },
 243         };
 244         struct acpi_object_list params = {
 245                 .count   = ARRAY_SIZE(in_objs),
 246                 .pointer = in_objs,
 247         };
 248         acpi_status status = AE_OK;
 249
 250         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 251                                       &params, NULL);
 252
 253         return (status == AE_OK) ? 0 : -EIO;
 254 }
 255
 256 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 257 {
 258         unsigned long long s;
 259         acpi_status status;
 260
 261         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
 262                                        NULL, &s);
 263         if (ACPI_SUCCESS(status))
 264                 return s;
 265         else {
 266                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 267                                   "evaluation error HKEY.SQTY\n"));
 268                 return -EINVAL;
 269         }
 270 }
 271
 272 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
 273 {
 274         acpi_status status;
 275         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 276         union acpi_object *hkey = NULL;
 277         int i;
 278
 279         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
 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                 status = AE_ERROR;
 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                         pcc->sinf[i] = element->integer.value;
 305                 } else
 306                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 307                                          "Invalid HKEY.SINF data\n"));
 308         }
 309         pcc->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))
 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))
 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 const 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))
 374                 return -EIO;
 375
 376         return snprintf(buf, PAGE_SIZE, "%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))
 386                 return -EIO;
 387
 388         return snprintf(buf, PAGE_SIZE, "%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))
 398                 return -EIO;
 399
 400         return snprintf(buf, PAGE_SIZE, "%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))
 410                 return -EIO;
 411
 412         return snprintf(buf, PAGE_SIZE, "%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 sleep_keydown_seen;
 453 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 454 {
 455         struct input_dev *hotk_input_dev = pcc->input_dev;
 456         int rc;
 457         unsigned long long result;
 458
 459         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 460                                    NULL, &result);
 461         if (!ACPI_SUCCESS(rc)) {
 462                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 463                                  "error getting hotkey status\n"));
 464                 return;
 465         }
 466
 467         /* hack: some firmware sends no key down for sleep / hibernate */
 468         if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
 469                 if (result & 0x80)
 470                         sleep_keydown_seen = 1;
 471                 if (!sleep_keydown_seen)
 472                         sparse_keymap_report_event(hotk_input_dev,
 473                                         result & 0xf, 0x80, false);
 474         }
 475
 476         if (!sparse_keymap_report_event(hotk_input_dev,
 477                                         result & 0xf, result & 0x80, false))
 478                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 479                                   "Unknown hotkey event: %d\n", result));
 480 }
 481
 482 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 483 {
 484         struct pcc_acpi *pcc = acpi_driver_data(device);
 485
 486         switch (event) {
 487         case HKEY_NOTIFY:
 488                 acpi_pcc_generate_keyinput(pcc);
 489                 break;
 490         default:
 491                 /* nothing to do */
 492                 break;
 493         }
 494 }
 495
 496 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 497 {
 498         struct input_dev *input_dev;
 499         int error;
 500
 501         input_dev = input_allocate_device();
 502         if (!input_dev)
 503                 return -ENOMEM;
 504
 505         input_dev->name = ACPI_PCC_DRIVER_NAME;
 506         input_dev->phys = ACPI_PCC_INPUT_PHYS;
 507         input_dev->id.bustype = BUS_HOST;
 508         input_dev->id.vendor = 0x0001;
 509         input_dev->id.product = 0x0001;
 510         input_dev->id.version = 0x0100;
 511
 512         error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
 513         if (error) {
 514                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 515                                   "Unable to setup input device keymap\n"));
 516                 goto err_free_dev;
 517         }
 518
 519         error = input_register_device(input_dev);
 520         if (error) {
 521                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 522                                   "Unable to register input device\n"));
 523                 goto err_free_keymap;
 524         }
 525
 526         pcc->input_dev = input_dev;
 527         return 0;
 528
 529  err_free_keymap:
 530         sparse_keymap_free(input_dev);
 531  err_free_dev:
 532         input_free_device(input_dev);
 533         return error;
 534 }
 535
 536 static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
 537 {
 538         sparse_keymap_free(pcc->input_dev);
 539         input_unregister_device(pcc->input_dev);
 540         /*
 541          * No need to input_free_device() since core input API refcounts
 542          * and free()s the device.
 543          */
 544 }
 545
 546 /* kernel module interface */
 547
 548 #ifdef CONFIG_PM_SLEEP
 549 static int acpi_pcc_hotkey_resume(struct device *dev)
 550 {
 551         struct pcc_acpi *pcc;
 552
 553         if (!dev)
 554                 return -EINVAL;
 555
 556         pcc = acpi_driver_data(to_acpi_device(dev));
 557         if (!pcc)
 558                 return -EINVAL;
 559
 560         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 561                           pcc->sticky_mode));
 562
 563         return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 564 }
 565 #endif
 566
 567 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 568 {
 569         struct backlight_properties props;
 570         struct pcc_acpi *pcc;
 571         int num_sifr, result;
 572
 573         if (!device)
 574                 return -EINVAL;
 575
 576         num_sifr = acpi_pcc_get_sqty(device);
 577
 578         if (num_sifr < 0 || num_sifr > 255) {
 579                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
 580                 return -ENODEV;
 581         }
 582
 583         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 584         if (!pcc) {
 585                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 586                                   "Couldn't allocate mem for pcc"));
 587                 return -ENOMEM;
 588         }
 589
 590         pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 591         if (!pcc->sinf) {
 592                 result = -ENOMEM;
 593                 goto out_hotkey;
 594         }
 595
 596         pcc->device = device;
 597         pcc->handle = device->handle;
 598         pcc->num_sifr = num_sifr;
 599         device->driver_data = pcc;
 600         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 601         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 602
 603         result = acpi_pcc_init_input(pcc);
 604         if (result) {
 605                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 606                                   "Error installing keyinput handler\n"));
 607                 goto out_sinf;
 608         }
 609
 610         if (!acpi_pcc_retrieve_biosdata(pcc)) {
 611                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 612                                  "Couldn't retrieve BIOS data\n"));
 613                 result = -EIO;
 614                 goto out_input;
 615         }
 616         /* initialize backlight */
 617         memset(&props, 0, sizeof(struct backlight_properties));
 618         props.type = BACKLIGHT_PLATFORM;
 619         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 620         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 621                                                    &pcc_backlight_ops, &props);
 622         if (IS_ERR(pcc->backlight)) {
 623                 result = PTR_ERR(pcc->backlight);
 624                 goto out_input;
 625         }
 626
 627         /* read the initial brightness setting from the hardware */
 628         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 629
 630         /* read the initial sticky key mode from the hardware */
 631         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 632
 633         /* add sysfs attributes */
 634         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 635         if (result)
 636                 goto out_backlight;
 637
 638         return 0;
 639
 640 out_backlight:
 641         backlight_device_unregister(pcc->backlight);
 642 out_input:
 643         acpi_pcc_destroy_input(pcc);
 644 out_sinf:
 645         kfree(pcc->sinf);
 646 out_hotkey:
 647         kfree(pcc);
 648
 649         return result;
 650 }
 651
 652 static int acpi_pcc_hotkey_remove(struct acpi_device *device)
 653 {
 654         struct pcc_acpi *pcc = acpi_driver_data(device);
 655
 656         if (!device || !pcc)
 657                 return -EINVAL;
 658
 659         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 660
 661         backlight_device_unregister(pcc->backlight);
 662
 663         acpi_pcc_destroy_input(pcc);
 664
 665         kfree(pcc->sinf);
 666         kfree(pcc);
 667
 668         return 0;
 669 }
 670
 671 module_acpi_driver(acpi_pcc_driver);