drivers/platform/x86/panasonic-laptop.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Panasonic HotKey and LCD brightness control driver
   4  *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
   5  *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
   6  *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
   7  *  (C) 2004 David Bronaugh <dbronaugh>
   8  *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
   9  *
  10  *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
  11  *
  12  *---------------------------------------------------------------------------
  13  *
  14  * ChangeLog:
  15  *      Sep.23, 2008    Harald Welte <laforge@gnumonks.org>
  16  *              -v0.95  rename driver from drivers/acpi/pcc_acpi.c to
  17  *                      drivers/misc/panasonic-laptop.c
  18  *
  19  *      Jul.04, 2008    Harald Welte <laforge@gnumonks.org>
  20  *              -v0.94  replace /proc interface with device attributes
  21  *                      support {set,get}keycode on th input device
  22  *
  23  *      Jun.27, 2008    Harald Welte <laforge@gnumonks.org>
  24  *              -v0.92  merge with 2.6.26-rc6 input API changes
  25  *                      remove broken <= 2.6.15 kernel support
  26  *                      resolve all compiler warnings
  27  *                      various coding style fixes (checkpatch.pl)
  28  *                      add support for backlight api
  29  *                      major code restructuring
  30  *
  31  *      Dac.28, 2007    Harald Welte <laforge@gnumonks.org>
  32  *              -v0.91  merge with 2.6.24-rc6 ACPI changes
  33  *
  34  *      Nov.04, 2006    Hiroshi Miura <miura@da-cha.org>
  35  *              -v0.9   remove warning about section reference.
  36  *                      remove acpi_os_free
  37  *                      add /proc/acpi/pcc/brightness interface for HAL access
  38  *                      merge dbronaugh's enhancement
  39  *                      Aug.17, 2004 David Bronaugh (dbronaugh)
  40  *                              - Added screen brightness setting interface
  41  *                                Thanks to FreeBSD crew (acpi_panasonic.c)
  42  *                                for the ideas I needed to accomplish it
  43  *
  44  *      May.29, 2006    Hiroshi Miura <miura@da-cha.org>
  45  *              -v0.8.4 follow to change keyinput structure
  46  *                      thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
  47  *                      Jacob Bower <jacob.bower@ic.ac.uk> and
  48  *                      Hiroshi Yokota for providing solutions.
  49  *
  50  *      Oct.02, 2004    Hiroshi Miura <miura@da-cha.org>
  51  *              -v0.8.2 merge code of YOKOTA Hiroshi
  52  *                                      <yokota@netlab.is.tsukuba.ac.jp>.
  53  *                      Add sticky key mode interface.
  54  *                      Refactoring acpi_pcc_generate_keyinput().
  55  *
  56  *      Sep.15, 2004    Hiroshi Miura <miura@da-cha.org>
  57  *              -v0.8   Generate key input event on input subsystem.
  58  *                      This is based on yet another driver written by
  59  *                                                      Ryuta Nakanishi.
  60  *
  61  *      Sep.10, 2004    Hiroshi Miura <miura@da-cha.org>
  62  *              -v0.7   Change proc interface functions using seq_file
  63  *                      facility as same as other ACPI drivers.
  64  *
  65  *      Aug.28, 2004    Hiroshi Miura <miura@da-cha.org>
  66  *              -v0.6.4 Fix a silly error with status checking
  67  *
  68  *      Aug.25, 2004    Hiroshi Miura <miura@da-cha.org>
  69  *              -v0.6.3 replace read_acpi_int by standard function
  70  *                                                      acpi_evaluate_integer
  71  *                      some clean up and make smart copyright notice.
  72  *                      fix return value of pcc_acpi_get_key()
  73  *                      fix checking return value of acpi_bus_register_driver()
  74  *
  75  *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  76  *              -v0.6.2 Add check on ACPI data (num_sifr)
  77  *                      Coding style cleanups, better error messages/handling
  78  *                      Fixed an off-by-one error in memory allocation
  79  *
  80  *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  81  *              -v0.6.1 Fix a silly error with status checking
  82  *
  83  *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
  84  *              - v0.6  Correct brightness controls to reflect reality
  85  *                      based on information gleaned by Hiroshi Miura
  86  *                      and discussions with Hiroshi Miura
  87  *
  88  *      Aug.10, 2004    Hiroshi Miura <miura@da-cha.org>
  89  *              - v0.5  support LCD brightness control
  90  *                      based on the disclosed information by MEI.
  91  *
  92  *      Jul.25, 2004    Hiroshi Miura <miura@da-cha.org>
  93  *              - v0.4  first post version
  94  *                      add function to retrive SIFR
  95  *
  96  *      Jul.24, 2004    Hiroshi Miura <miura@da-cha.org>
  97  *              - v0.3  get proper status of hotkey
  98  *
  99  *      Jul.22, 2004    Hiroshi Miura <miura@da-cha.org>
 100  *              - v0.2  add HotKey handler
 101  *
 102  *      Jul.17, 2004    Hiroshi Miura <miura@da-cha.org>
 103  *              - v0.1  start from toshiba_acpi driver written by John Belmonte
 104  */
 105
 106 #include <linux/kernel.h>
 107 #include <linux/module.h>
 108 #include <linux/init.h>
 109 #include <linux/types.h>
 110 #include <linux/backlight.h>
 111 #include <linux/ctype.h>
 112 #include <linux/seq_file.h>
 113 #include <linux/uaccess.h>
 114 #include <linux/slab.h>
 115 #include <linux/acpi.h>
 116 #include <linux/input.h>
 117 #include <linux/input/sparse-keymap.h>
 118
 119 #ifndef ACPI_HOTKEY_COMPONENT
 120 #define ACPI_HOTKEY_COMPONENT   0x10000000
 121 #endif
 122
 123 #define _COMPONENT              ACPI_HOTKEY_COMPONENT
 124
 125 MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
 126 MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
 127 MODULE_LICENSE("GPL");
 128
 129 #define LOGPREFIX "pcc_acpi: "
 130
 131 /* Define ACPI PATHs */
 132 /* Lets note hotkeys */
 133 #define METHOD_HKEY_QUERY       "HINF"
 134 #define METHOD_HKEY_SQTY        "SQTY"
 135 #define METHOD_HKEY_SINF        "SINF"
 136 #define METHOD_HKEY_SSET        "SSET"
 137 #define HKEY_NOTIFY              0x80
 138
 139 #define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
 140 #define ACPI_PCC_DEVICE_NAME    "Hotkey"
 141 #define ACPI_PCC_CLASS          "pcc"
 142
 143 #define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
 144
 145 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
 146    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
 147 */
 148 enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 149                  SINF_LCD_TYPE,
 150                  SINF_AC_MAX_BRIGHT,
 151                  SINF_AC_MIN_BRIGHT,
 152                  SINF_AC_CUR_BRIGHT,
 153                  SINF_DC_MAX_BRIGHT,
 154                  SINF_DC_MIN_BRIGHT,
 155                  SINF_DC_CUR_BRIGHT,
 156                  SINF_MUTE,
 157                  SINF_RESERVED,
 158                  SINF_ENV_STATE,
 159                  SINF_STICKY_KEY = 0x80,
 160         };
 161 /* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
 162
 163 static int acpi_pcc_hotkey_add(struct acpi_device *device);
 164 static int acpi_pcc_hotkey_remove(struct acpi_device *device);
 165 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 166
 167 static const struct acpi_device_id pcc_device_ids[] = {
 168         { "MAT0012", 0},
 169         { "MAT0013", 0},
 170         { "MAT0018", 0},
 171         { "MAT0019", 0},
 172         { "", 0},
 173 };
 174 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
 175
 176 #ifdef CONFIG_PM_SLEEP
 177 static int acpi_pcc_hotkey_resume(struct device *dev);
 178 #endif
 179 static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
 180
 181 static struct acpi_driver acpi_pcc_driver = {
 182         .name =         ACPI_PCC_DRIVER_NAME,
 183         .class =        ACPI_PCC_CLASS,
 184         .ids =          pcc_device_ids,
 185         .ops =          {
 186                                 .add =          acpi_pcc_hotkey_add,
 187                                 .remove =       acpi_pcc_hotkey_remove,
 188                                 .notify =       acpi_pcc_hotkey_notify,
 189                         },
 190         .drv.pm =       &acpi_pcc_hotkey_pm,
 191 };
 192
 193 static const struct key_entry panasonic_keymap[] = {
 194         { KE_KEY, 0, { KEY_RESERVED } },
 195         { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
 196         { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
 197         { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
 198         { KE_KEY, 4, { KEY_MUTE } },
 199         { KE_KEY, 5, { KEY_VOLUMEDOWN } },
 200         { KE_KEY, 6, { KEY_VOLUMEUP } },
 201         { KE_KEY, 7, { KEY_SLEEP } },
 202         { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
 203         { KE_KEY, 9, { KEY_BATTERY } },
 204         { KE_KEY, 10, { KEY_SUSPEND } },
 205         { KE_END, 0 }
 206 };
 207
 208 struct pcc_acpi {
 209         acpi_handle             handle;
 210         unsigned long           num_sifr;
 211         int                     sticky_mode;
 212         u32                     *sinf;
 213         struct acpi_device      *device;
 214         struct input_dev        *input_dev;
 215         struct backlight_device *backlight;
 216 };
 217
 218 /* method access functions */
 219 static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 220 {
 221         union acpi_object in_objs[] = {
 222                 { .integer.type  = ACPI_TYPE_INTEGER,
 223                   .integer.value = func, },
 224                 { .integer.type  = ACPI_TYPE_INTEGER,
 225                   .integer.value = val, },
 226         };
 227         struct acpi_object_list params = {
 228                 .count   = ARRAY_SIZE(in_objs),
 229                 .pointer = in_objs,
 230         };
 231         acpi_status status = AE_OK;
 232
 233         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 234                                       &params, NULL);
 235
 236         return (status == AE_OK) ? 0 : -EIO;
 237 }
 238
 239 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 240 {
 241         unsigned long long s;
 242         acpi_status status;
 243
 244         status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
 245                                        NULL, &s);
 246         if (ACPI_SUCCESS(status))
 247                 return s;
 248         else {
 249                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 250                                   "evaluation error HKEY.SQTY\n"));
 251                 return -EINVAL;
 252         }
 253 }
 254
 255 static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
 256 {
 257         acpi_status status;
 258         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 259         union acpi_object *hkey = NULL;
 260         int i;
 261
 262         status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
 263                                       &buffer);
 264         if (ACPI_FAILURE(status)) {
 265                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 266                                   "evaluation error HKEY.SINF\n"));
 267                 return 0;
 268         }
 269
 270         hkey = buffer.pointer;
 271         if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 272                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 273                 status = AE_ERROR;
 274                 goto end;
 275         }
 276
 277         if (pcc->num_sifr < hkey->package.count) {
 278                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 279                                  "SQTY reports bad SINF length\n"));
 280                 status = AE_ERROR;
 281                 goto end;
 282         }
 283
 284         for (i = 0; i < hkey->package.count; i++) {
 285                 union acpi_object *element = &(hkey->package.elements[i]);
 286                 if (likely(element->type == ACPI_TYPE_INTEGER)) {
 287                         pcc->sinf[i] = element->integer.value;
 288                 } else
 289                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 290                                          "Invalid HKEY.SINF data\n"));
 291         }
 292         pcc->sinf[hkey->package.count] = -1;
 293
 294 end:
 295         kfree(buffer.pointer);
 296         return status == AE_OK;
 297 }
 298
 299 /* backlight API interface functions */
 300
 301 /* This driver currently treats AC and DC brightness identical,
 302  * since we don't need to invent an interface to the core ACPI
 303  * logic to receive events in case a power supply is plugged in
 304  * or removed */
 305
 306 static int bl_get(struct backlight_device *bd)
 307 {
 308         struct pcc_acpi *pcc = bl_get_data(bd);
 309
 310         if (!acpi_pcc_retrieve_biosdata(pcc))
 311                 return -EIO;
 312
 313         return pcc->sinf[SINF_AC_CUR_BRIGHT];
 314 }
 315
 316 static int bl_set_status(struct backlight_device *bd)
 317 {
 318         struct pcc_acpi *pcc = bl_get_data(bd);
 319         int bright = bd->props.brightness;
 320         int rc;
 321
 322         if (!acpi_pcc_retrieve_biosdata(pcc))
 323                 return -EIO;
 324
 325         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
 326                 bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
 327
 328         if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
 329                 bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
 330
 331         if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
 332             bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
 333                 return -EINVAL;
 334
 335         rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
 336         if (rc < 0)
 337                 return rc;
 338
 339         return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 340 }
 341
 342 static const struct backlight_ops pcc_backlight_ops = {
 343         .get_brightness = bl_get,
 344         .update_status  = bl_set_status,
 345 };
 346
 347
 348 /* sysfs user interface functions */
 349
 350 static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
 351                             char *buf)
 352 {
 353         struct acpi_device *acpi = to_acpi_device(dev);
 354         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 355
 356         if (!acpi_pcc_retrieve_biosdata(pcc))
 357                 return -EIO;
 358
 359         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
 360 }
 361
 362 static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
 363                             char *buf)
 364 {
 365         struct acpi_device *acpi = to_acpi_device(dev);
 366         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 367
 368         if (!acpi_pcc_retrieve_biosdata(pcc))
 369                 return -EIO;
 370
 371         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
 372 }
 373
 374 static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
 375                          char *buf)
 376 {
 377         struct acpi_device *acpi = to_acpi_device(dev);
 378         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 379
 380         if (!acpi_pcc_retrieve_biosdata(pcc))
 381                 return -EIO;
 382
 383         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
 384 }
 385
 386 static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
 387                            char *buf)
 388 {
 389         struct acpi_device *acpi = to_acpi_device(dev);
 390         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 391
 392         if (!acpi_pcc_retrieve_biosdata(pcc))
 393                 return -EIO;
 394
 395         return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
 396 }
 397
 398 static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
 399                           const char *buf, size_t count)
 400 {
 401         struct acpi_device *acpi = to_acpi_device(dev);
 402         struct pcc_acpi *pcc = acpi_driver_data(acpi);
 403         int val;
 404
 405         if (count && sscanf(buf, "%i", &val) == 1 &&
 406             (val == 0 || val == 1)) {
 407                 acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
 408                 pcc->sticky_mode = val;
 409         }
 410
 411         return count;
 412 }
 413
 414 static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
 415 static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
 416 static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
 417 static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
 418
 419 static struct attribute *pcc_sysfs_entries[] = {
 420         &dev_attr_numbatt.attr,
 421         &dev_attr_lcdtype.attr,
 422         &dev_attr_mute.attr,
 423         &dev_attr_sticky_key.attr,
 424         NULL,
 425 };
 426
 427 static const struct attribute_group pcc_attr_group = {
 428         .name   = NULL,         /* put in device directory */
 429         .attrs  = pcc_sysfs_entries,
 430 };
 431
 432
 433 /* hotkey input device driver */
 434
 435 static int sleep_keydown_seen;
 436 static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 437 {
 438         struct input_dev *hotk_input_dev = pcc->input_dev;
 439         int rc;
 440         unsigned long long result;
 441
 442         rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 443                                    NULL, &result);
 444         if (ACPI_FAILURE(rc)) {
 445                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 446                                  "error getting hotkey status\n"));
 447                 return;
 448         }
 449
 450         /* hack: some firmware sends no key down for sleep / hibernate */
 451         if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
 452                 if (result & 0x80)
 453                         sleep_keydown_seen = 1;
 454                 if (!sleep_keydown_seen)
 455                         sparse_keymap_report_event(hotk_input_dev,
 456                                         result & 0xf, 0x80, false);
 457         }
 458
 459         if (!sparse_keymap_report_event(hotk_input_dev,
 460                                         result & 0xf, result & 0x80, false))
 461                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 462                                   "Unknown hotkey event: %d\n", result));
 463 }
 464
 465 static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 466 {
 467         struct pcc_acpi *pcc = acpi_driver_data(device);
 468
 469         switch (event) {
 470         case HKEY_NOTIFY:
 471                 acpi_pcc_generate_keyinput(pcc);
 472                 break;
 473         default:
 474                 /* nothing to do */
 475                 break;
 476         }
 477 }
 478
 479 static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 480 {
 481         struct input_dev *input_dev;
 482         int error;
 483
 484         input_dev = input_allocate_device();
 485         if (!input_dev)
 486                 return -ENOMEM;
 487
 488         input_dev->name = ACPI_PCC_DRIVER_NAME;
 489         input_dev->phys = ACPI_PCC_INPUT_PHYS;
 490         input_dev->id.bustype = BUS_HOST;
 491         input_dev->id.vendor = 0x0001;
 492         input_dev->id.product = 0x0001;
 493         input_dev->id.version = 0x0100;
 494
 495         error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
 496         if (error) {
 497                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 498                                   "Unable to setup input device keymap\n"));
 499                 goto err_free_dev;
 500         }
 501
 502         error = input_register_device(input_dev);
 503         if (error) {
 504                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 505                                   "Unable to register input device\n"));
 506                 goto err_free_dev;
 507         }
 508
 509         pcc->input_dev = input_dev;
 510         return 0;
 511
 512  err_free_dev:
 513         input_free_device(input_dev);
 514         return error;
 515 }
 516
 517 /* kernel module interface */
 518
 519 #ifdef CONFIG_PM_SLEEP
 520 static int acpi_pcc_hotkey_resume(struct device *dev)
 521 {
 522         struct pcc_acpi *pcc;
 523
 524         if (!dev)
 525                 return -EINVAL;
 526
 527         pcc = acpi_driver_data(to_acpi_device(dev));
 528         if (!pcc)
 529                 return -EINVAL;
 530
 531         ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 532                           pcc->sticky_mode));
 533
 534         return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 535 }
 536 #endif
 537
 538 static int acpi_pcc_hotkey_add(struct acpi_device *device)
 539 {
 540         struct backlight_properties props;
 541         struct pcc_acpi *pcc;
 542         int num_sifr, result;
 543
 544         if (!device)
 545                 return -EINVAL;
 546
 547         num_sifr = acpi_pcc_get_sqty(device);
 548
 549         if (num_sifr < 0 || num_sifr > 255) {
 550                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
 551                 return -ENODEV;
 552         }
 553
 554         pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 555         if (!pcc) {
 556                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 557                                   "Couldn't allocate mem for pcc"));
 558                 return -ENOMEM;
 559         }
 560
 561         pcc->sinf = kcalloc(num_sifr + 1, sizeof(u32), GFP_KERNEL);
 562         if (!pcc->sinf) {
 563                 result = -ENOMEM;
 564                 goto out_hotkey;
 565         }
 566
 567         pcc->device = device;
 568         pcc->handle = device->handle;
 569         pcc->num_sifr = num_sifr;
 570         device->driver_data = pcc;
 571         strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 572         strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 573
 574         result = acpi_pcc_init_input(pcc);
 575         if (result) {
 576                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 577                                   "Error installing keyinput handler\n"));
 578                 goto out_sinf;
 579         }
 580
 581         if (!acpi_pcc_retrieve_biosdata(pcc)) {
 582                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 583                                  "Couldn't retrieve BIOS data\n"));
 584                 result = -EIO;
 585                 goto out_input;
 586         }
 587         /* initialize backlight */
 588         memset(&props, 0, sizeof(struct backlight_properties));
 589         props.type = BACKLIGHT_PLATFORM;
 590         props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 591         pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 592                                                    &pcc_backlight_ops, &props);
 593         if (IS_ERR(pcc->backlight)) {
 594                 result = PTR_ERR(pcc->backlight);
 595                 goto out_input;
 596         }
 597
 598         /* read the initial brightness setting from the hardware */
 599         pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 600
 601         /* read the initial sticky key mode from the hardware */
 602         pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 603
 604         /* add sysfs attributes */
 605         result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 606         if (result)
 607                 goto out_backlight;
 608
 609         return 0;
 610
 611 out_backlight:
 612         backlight_device_unregister(pcc->backlight);
 613 out_input:
 614         input_unregister_device(pcc->input_dev);
 615 out_sinf:
 616         kfree(pcc->sinf);
 617 out_hotkey:
 618         kfree(pcc);
 619
 620         return result;
 621 }
 622
 623 static int acpi_pcc_hotkey_remove(struct acpi_device *device)
 624 {
 625         struct pcc_acpi *pcc = acpi_driver_data(device);
 626
 627         if (!device || !pcc)
 628                 return -EINVAL;
 629
 630         sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 631
 632         backlight_device_unregister(pcc->backlight);
 633
 634         input_unregister_device(pcc->input_dev);
 635
 636         kfree(pcc->sinf);
 637         kfree(pcc);
 638
 639         return 0;
 640 }
 641
 642 module_acpi_driver(acpi_pcc_driver);