linux/drivers/platform/x86/panasonic-laptop.c
<<
>>
Prefs
   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 <acpi/acpi_bus.h>
 129#include <acpi/acpi_drivers.h>
 130#include <linux/input.h>
 131#include <linux/input/sparse-keymap.h>
 132
 133
 134#ifndef ACPI_HOTKEY_COMPONENT
 135#define ACPI_HOTKEY_COMPONENT   0x10000000
 136#endif
 137
 138#define _COMPONENT              ACPI_HOTKEY_COMPONENT
 139
 140MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
 141MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
 142MODULE_LICENSE("GPL");
 143
 144#define LOGPREFIX "pcc_acpi: "
 145
 146/* Define ACPI PATHs */
 147/* Lets note hotkeys */
 148#define METHOD_HKEY_QUERY       "HINF"
 149#define METHOD_HKEY_SQTY        "SQTY"
 150#define METHOD_HKEY_SINF        "SINF"
 151#define METHOD_HKEY_SSET        "SSET"
 152#define HKEY_NOTIFY              0x80
 153
 154#define ACPI_PCC_DRIVER_NAME    "Panasonic Laptop Support"
 155#define ACPI_PCC_DEVICE_NAME    "Hotkey"
 156#define ACPI_PCC_CLASS          "pcc"
 157
 158#define ACPI_PCC_INPUT_PHYS     "panasonic/hkey0"
 159
 160/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
 161   ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
 162*/
 163enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 164                 SINF_LCD_TYPE,
 165                 SINF_AC_MAX_BRIGHT,
 166                 SINF_AC_MIN_BRIGHT,
 167                 SINF_AC_CUR_BRIGHT,
 168                 SINF_DC_MAX_BRIGHT,
 169                 SINF_DC_MIN_BRIGHT,
 170                 SINF_DC_CUR_BRIGHT,
 171                 SINF_MUTE,
 172                 SINF_RESERVED,
 173                 SINF_ENV_STATE,
 174                 SINF_STICKY_KEY = 0x80,
 175        };
 176/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
 177
 178static int acpi_pcc_hotkey_add(struct acpi_device *device);
 179static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
 180static int acpi_pcc_hotkey_resume(struct acpi_device *device);
 181static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
 182
 183static const struct acpi_device_id pcc_device_ids[] = {
 184        { "MAT0012", 0},
 185        { "MAT0013", 0},
 186        { "MAT0018", 0},
 187        { "MAT0019", 0},
 188        { "", 0},
 189};
 190MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
 191
 192static struct acpi_driver acpi_pcc_driver = {
 193        .name =         ACPI_PCC_DRIVER_NAME,
 194        .class =        ACPI_PCC_CLASS,
 195        .ids =          pcc_device_ids,
 196        .ops =          {
 197                                .add =          acpi_pcc_hotkey_add,
 198                                .remove =       acpi_pcc_hotkey_remove,
 199                                .resume =       acpi_pcc_hotkey_resume,
 200                                .notify =       acpi_pcc_hotkey_notify,
 201                        },
 202};
 203
 204static const struct key_entry panasonic_keymap[] = {
 205        { KE_KEY, 0, { KEY_RESERVED } },
 206        { KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
 207        { KE_KEY, 2, { KEY_BRIGHTNESSUP } },
 208        { KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
 209        { KE_KEY, 4, { KEY_MUTE } },
 210        { KE_KEY, 5, { KEY_VOLUMEDOWN } },
 211        { KE_KEY, 6, { KEY_VOLUMEUP } },
 212        { KE_KEY, 7, { KEY_SLEEP } },
 213        { KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
 214        { KE_KEY, 9, { KEY_BATTERY } },
 215        { KE_KEY, 10, { KEY_SUSPEND } },
 216        { KE_END, 0 }
 217};
 218
 219struct pcc_acpi {
 220        acpi_handle             handle;
 221        unsigned long           num_sifr;
 222        int                     sticky_mode;
 223        u32                     *sinf;
 224        struct acpi_device      *device;
 225        struct input_dev        *input_dev;
 226        struct backlight_device *backlight;
 227};
 228
 229struct pcc_keyinput {
 230        struct acpi_hotkey      *hotkey;
 231};
 232
 233/* method access functions */
 234static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
 235{
 236        union acpi_object in_objs[] = {
 237                { .integer.type  = ACPI_TYPE_INTEGER,
 238                  .integer.value = func, },
 239                { .integer.type  = ACPI_TYPE_INTEGER,
 240                  .integer.value = val, },
 241        };
 242        struct acpi_object_list params = {
 243                .count   = ARRAY_SIZE(in_objs),
 244                .pointer = in_objs,
 245        };
 246        acpi_status status = AE_OK;
 247
 248        status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
 249                                      &params, NULL);
 250
 251        return (status == AE_OK) ? 0 : -EIO;
 252}
 253
 254static inline int acpi_pcc_get_sqty(struct acpi_device *device)
 255{
 256        unsigned long long s;
 257        acpi_status status;
 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
 270static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
 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        status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
 278                                      &buffer);
 279        if (ACPI_FAILURE(status)) {
 280                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 281                                  "evaluation error HKEY.SINF\n"));
 282                return 0;
 283        }
 284
 285        hkey = buffer.pointer;
 286        if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 287                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
 288                status = AE_ERROR;
 289                goto end;
 290        }
 291
 292        if (pcc->num_sifr < hkey->package.count) {
 293                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 294                                 "SQTY reports bad SINF length\n"));
 295                status = AE_ERROR;
 296                goto end;
 297        }
 298
 299        for (i = 0; i < hkey->package.count; i++) {
 300                union acpi_object *element = &(hkey->package.elements[i]);
 301                if (likely(element->type == ACPI_TYPE_INTEGER)) {
 302                        pcc->sinf[i] = element->integer.value;
 303                } else
 304                        ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 305                                         "Invalid HKEY.SINF data\n"));
 306        }
 307        pcc->sinf[hkey->package.count] = -1;
 308
 309end:
 310        kfree(buffer.pointer);
 311        return status == AE_OK;
 312}
 313
 314/* backlight API interface functions */
 315
 316/* This driver currently treats AC and DC brightness identical,
 317 * since we don't need to invent an interface to the core ACPI
 318 * logic to receive events in case a power supply is plugged in
 319 * or removed */
 320
 321static int bl_get(struct backlight_device *bd)
 322{
 323        struct pcc_acpi *pcc = bl_get_data(bd);
 324
 325        if (!acpi_pcc_retrieve_biosdata(pcc))
 326                return -EIO;
 327
 328        return pcc->sinf[SINF_AC_CUR_BRIGHT];
 329}
 330
 331static int bl_set_status(struct backlight_device *bd)
 332{
 333        struct pcc_acpi *pcc = bl_get_data(bd);
 334        int bright = bd->props.brightness;
 335        int rc;
 336
 337        if (!acpi_pcc_retrieve_biosdata(pcc))
 338                return -EIO;
 339
 340        if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
 341                bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
 342
 343        if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
 344                bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
 345
 346        if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
 347            bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
 348                return -EINVAL;
 349
 350        rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
 351        if (rc < 0)
 352                return rc;
 353
 354        return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
 355}
 356
 357static const struct backlight_ops pcc_backlight_ops = {
 358        .get_brightness = bl_get,
 359        .update_status  = bl_set_status,
 360};
 361
 362
 363/* sysfs user interface functions */
 364
 365static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
 366                            char *buf)
 367{
 368        struct acpi_device *acpi = to_acpi_device(dev);
 369        struct pcc_acpi *pcc = acpi_driver_data(acpi);
 370
 371        if (!acpi_pcc_retrieve_biosdata(pcc))
 372                return -EIO;
 373
 374        return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
 375}
 376
 377static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
 378                            char *buf)
 379{
 380        struct acpi_device *acpi = to_acpi_device(dev);
 381        struct pcc_acpi *pcc = acpi_driver_data(acpi);
 382
 383        if (!acpi_pcc_retrieve_biosdata(pcc))
 384                return -EIO;
 385
 386        return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
 387}
 388
 389static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
 390                         char *buf)
 391{
 392        struct acpi_device *acpi = to_acpi_device(dev);
 393        struct pcc_acpi *pcc = acpi_driver_data(acpi);
 394
 395        if (!acpi_pcc_retrieve_biosdata(pcc))
 396                return -EIO;
 397
 398        return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
 399}
 400
 401static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
 402                           char *buf)
 403{
 404        struct acpi_device *acpi = to_acpi_device(dev);
 405        struct pcc_acpi *pcc = acpi_driver_data(acpi);
 406
 407        if (!acpi_pcc_retrieve_biosdata(pcc))
 408                return -EIO;
 409
 410        return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
 411}
 412
 413static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
 414                          const char *buf, size_t count)
 415{
 416        struct acpi_device *acpi = to_acpi_device(dev);
 417        struct pcc_acpi *pcc = acpi_driver_data(acpi);
 418        int val;
 419
 420        if (count && sscanf(buf, "%i", &val) == 1 &&
 421            (val == 0 || val == 1)) {
 422                acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
 423                pcc->sticky_mode = val;
 424        }
 425
 426        return count;
 427}
 428
 429static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
 430static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
 431static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
 432static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
 433
 434static struct attribute *pcc_sysfs_entries[] = {
 435        &dev_attr_numbatt.attr,
 436        &dev_attr_lcdtype.attr,
 437        &dev_attr_mute.attr,
 438        &dev_attr_sticky_key.attr,
 439        NULL,
 440};
 441
 442static struct attribute_group pcc_attr_group = {
 443        .name   = NULL,         /* put in device directory */
 444        .attrs  = pcc_sysfs_entries,
 445};
 446
 447
 448/* hotkey input device driver */
 449
 450static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 451{
 452        struct input_dev *hotk_input_dev = pcc->input_dev;
 453        int rc;
 454        unsigned long long result;
 455
 456        rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
 457                                   NULL, &result);
 458        if (!ACPI_SUCCESS(rc)) {
 459                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 460                                 "error getting hotkey status\n"));
 461                return;
 462        }
 463
 464        acpi_bus_generate_proc_event(pcc->device, HKEY_NOTIFY, result);
 465
 466        if (!sparse_keymap_report_event(hotk_input_dev,
 467                                        result & 0xf, result & 0x80, false))
 468                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 469                                  "Unknown hotkey event: %d\n", result));
 470}
 471
 472static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
 473{
 474        struct pcc_acpi *pcc = acpi_driver_data(device);
 475
 476        switch (event) {
 477        case HKEY_NOTIFY:
 478                acpi_pcc_generate_keyinput(pcc);
 479                break;
 480        default:
 481                /* nothing to do */
 482                break;
 483        }
 484}
 485
 486static int acpi_pcc_init_input(struct pcc_acpi *pcc)
 487{
 488        struct input_dev *input_dev;
 489        int error;
 490
 491        input_dev = input_allocate_device();
 492        if (!input_dev) {
 493                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 494                                  "Couldn't allocate input device for hotkey"));
 495                return -ENOMEM;
 496        }
 497
 498        input_dev->name = ACPI_PCC_DRIVER_NAME;
 499        input_dev->phys = ACPI_PCC_INPUT_PHYS;
 500        input_dev->id.bustype = BUS_HOST;
 501        input_dev->id.vendor = 0x0001;
 502        input_dev->id.product = 0x0001;
 503        input_dev->id.version = 0x0100;
 504
 505        error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
 506        if (error) {
 507                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 508                                  "Unable to setup input device keymap\n"));
 509                goto err_free_dev;
 510        }
 511
 512        error = input_register_device(input_dev);
 513        if (error) {
 514                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 515                                  "Unable to register input device\n"));
 516                goto err_free_keymap;
 517        }
 518
 519        pcc->input_dev = input_dev;
 520        return 0;
 521
 522 err_free_keymap:
 523        sparse_keymap_free(input_dev);
 524 err_free_dev:
 525        input_free_device(input_dev);
 526        return error;
 527}
 528
 529static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
 530{
 531        sparse_keymap_free(pcc->input_dev);
 532        input_unregister_device(pcc->input_dev);
 533        /*
 534         * No need to input_free_device() since core input API refcounts
 535         * and free()s the device.
 536         */
 537}
 538
 539/* kernel module interface */
 540
 541static int acpi_pcc_hotkey_resume(struct acpi_device *device)
 542{
 543        struct pcc_acpi *pcc = acpi_driver_data(device);
 544
 545        if (device == NULL || pcc == NULL)
 546                return -EINVAL;
 547
 548        ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
 549                          pcc->sticky_mode));
 550
 551        return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
 552}
 553
 554static int acpi_pcc_hotkey_add(struct acpi_device *device)
 555{
 556        struct backlight_properties props;
 557        struct pcc_acpi *pcc;
 558        int num_sifr, result;
 559
 560        if (!device)
 561                return -EINVAL;
 562
 563        num_sifr = acpi_pcc_get_sqty(device);
 564
 565        if (num_sifr < 0 || num_sifr > 255) {
 566                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
 567                return -ENODEV;
 568        }
 569
 570        pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 571        if (!pcc) {
 572                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 573                                  "Couldn't allocate mem for pcc"));
 574                return -ENOMEM;
 575        }
 576
 577        pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
 578        if (!pcc->sinf) {
 579                result = -ENOMEM;
 580                goto out_hotkey;
 581        }
 582
 583        pcc->device = device;
 584        pcc->handle = device->handle;
 585        pcc->num_sifr = num_sifr;
 586        device->driver_data = pcc;
 587        strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
 588        strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 589
 590        result = acpi_pcc_init_input(pcc);
 591        if (result) {
 592                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 593                                  "Error installing keyinput handler\n"));
 594                goto out_sinf;
 595        }
 596
 597        if (!acpi_pcc_retrieve_biosdata(pcc)) {
 598                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 599                                 "Couldn't retrieve BIOS data\n"));
 600                result = -EIO;
 601                goto out_input;
 602        }
 603        /* initialize backlight */
 604        memset(&props, 0, sizeof(struct backlight_properties));
 605        props.type = BACKLIGHT_PLATFORM;
 606        props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
 607        pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
 608                                                   &pcc_backlight_ops, &props);
 609        if (IS_ERR(pcc->backlight)) {
 610                result = PTR_ERR(pcc->backlight);
 611                goto out_input;
 612        }
 613
 614        /* read the initial brightness setting from the hardware */
 615        pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
 616
 617        /* read the initial sticky key mode from the hardware */
 618        pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
 619
 620        /* add sysfs attributes */
 621        result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
 622        if (result)
 623                goto out_backlight;
 624
 625        return 0;
 626
 627out_backlight:
 628        backlight_device_unregister(pcc->backlight);
 629out_input:
 630        acpi_pcc_destroy_input(pcc);
 631out_sinf:
 632        kfree(pcc->sinf);
 633out_hotkey:
 634        kfree(pcc);
 635
 636        return result;
 637}
 638
 639static int __init acpi_pcc_init(void)
 640{
 641        int result = 0;
 642
 643        if (acpi_disabled)
 644                return -ENODEV;
 645
 646        result = acpi_bus_register_driver(&acpi_pcc_driver);
 647        if (result < 0) {
 648                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 649                                  "Error registering hotkey driver\n"));
 650                return -ENODEV;
 651        }
 652
 653        return 0;
 654}
 655
 656static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 657{
 658        struct pcc_acpi *pcc = acpi_driver_data(device);
 659
 660        if (!device || !pcc)
 661                return -EINVAL;
 662
 663        sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
 664
 665        backlight_device_unregister(pcc->backlight);
 666
 667        acpi_pcc_destroy_input(pcc);
 668
 669        kfree(pcc->sinf);
 670        kfree(pcc);
 671
 672        return 0;
 673}
 674
 675static void __exit acpi_pcc_exit(void)
 676{
 677        acpi_bus_unregister_driver(&acpi_pcc_driver);
 678}
 679
 680module_init(acpi_pcc_init);
 681module_exit(acpi_pcc_exit);
 682
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.