drivers/acpi/ibm_acpi.c

   1 /*
   2  *  ibm_acpi.c - IBM ThinkPad ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2004 Borislav Deianov
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *  Changelog:
  22  *
  23  *  2004-08-09  0.1     initial release, support for X series
  24  *  2004-08-14  0.2     support for T series, X20
  25  *                      bluetooth enable/disable
  26  *                      hotkey events disabled by default
  27  *                      removed fan control, currently useless
  28  *  2004-08-17  0.3     support for R40
  29  *                      lcd off, brightness control
  30  *                      thinklight on/off
  31  *  2004-09-16  0.4     support for module parameters
  32  *                      hotkey mask can be prefixed by 0x
  33  *                      video output switching
  34  *                      video expansion control
  35  *                      ultrabay eject support
  36  *                      removed lcd brightness/on/off control, didn't work
  37  *  2004-10-18  0.5     thinklight support on A21e, G40, R32, T20, T21, X20
  38  *                      proc file format changed
  39  *                      video_switch command
  40  *                      experimental cmos control
  41  *                      experimental led control
  42  *                      experimental acpi sounds
  43  *  2004-10-19  0.6     use acpi_bus_register_driver() to claim HKEY device
  44  *  2004-10-23  0.7     fix module loading on A21e, A22p, T20, T21, X20
  45  *                      fix LED control on A21e
  46  *  2004-11-08  0.8     fix init error case, don't return from a macro
  47  *                              thanks to Chris Wright <chrisw@osdl.org>
  48  */
  49
  50 #define IBM_VERSION "0.8"
  51
  52 #include <linux/kernel.h>
  53 #include <linux/module.h>
  54 #include <linux/init.h>
  55 #include <linux/types.h>
  56 #include <linux/proc_fs.h>
  57 #include <asm/uaccess.h>
  58
  59 #include <acpi/acpi_drivers.h>
  60 #include <acpi/acnamesp.h>
  61
  62 #define IBM_NAME "ibm"
  63 #define IBM_DESC "IBM ThinkPad ACPI Extras"
  64 #define IBM_FILE "ibm_acpi"
  65 #define IBM_URL "http://ibm-acpi.sf.net/"
  66
  67 #define IBM_DIR IBM_NAME
  68
  69 #define IBM_LOG IBM_FILE ": "
  70 #define IBM_ERR    KERN_ERR    IBM_LOG
  71 #define IBM_NOTICE KERN_NOTICE IBM_LOG
  72 #define IBM_INFO   KERN_INFO   IBM_LOG
  73 #define IBM_DEBUG  KERN_DEBUG  IBM_LOG
  74
  75 #define IBM_MAX_ACPI_ARGS 3
  76
  77 #define __unused __attribute__ ((unused))
  78
  79 static int experimental;
  80 module_param(experimental, int, 0);
  81
  82 static acpi_handle root_handle = NULL;
  83
  84 #define IBM_HANDLE(object, parent, paths...)                    \
  85         static acpi_handle  object##_handle;                    \
  86         static acpi_handle *object##_parent = &parent##_handle; \
  87         static char        *object##_paths[] = { paths }
  88
  89 IBM_HANDLE(ec, root,
  90            "\\_SB.PCI0.ISA.EC",    /* A21e, A22p, T20, T21, X20 */
  91            "\\_SB.PCI0.LPC.EC",    /* all others */
  92 );
  93
  94 IBM_HANDLE(vid, root,
  95            "\\_SB.PCI0.VID",       /* A21e, G40, X30, X40 */
  96            "\\_SB.PCI0.AGP.VID",   /* all others */
  97 );
  98
  99 IBM_HANDLE(cmos, root,
 100            "\\UCMS",               /* R50, R50p, R51, T4x, X31, X40 */
 101            "\\CMOS",               /* A3x, G40, R32, T23, T30, X22, X24, X30 */
 102            "\\CMS",                /* R40, R40e */
 103 );                                 /* A21e, A22p, T20, T21, X20 */
 104
 105 IBM_HANDLE(dock, root,
 106            "\\_SB.GDCK",           /* X30, X31, X40 */
 107            "\\_SB.PCI0.DOCK",      /* A22p, T20, T21, X20 */
 108            "\\_SB.PCI0.PCI1.DOCK", /* all others */
 109 );                                 /* A21e, G40, R32, R40, R40e */
 110
 111 IBM_HANDLE(bay, root,
 112            "\\_SB.PCI0.IDE0.SCND.MSTR");      /* all except A21e */
 113 IBM_HANDLE(bayej, root,
 114            "\\_SB.PCI0.IDE0.SCND.MSTR._EJ0"); /* all except A2x, A3x */
 115
 116 IBM_HANDLE(lght, root, "\\LGHT");  /* A21e, A22p, T20, T21, X20 */
 117 IBM_HANDLE(hkey, ec,   "HKEY");    /* all */
 118 IBM_HANDLE(led,  ec,   "LED");     /* all except A21e, A22p, T20, T21, X20 */
 119 IBM_HANDLE(sysl, ec,   "SYSL");    /* A21e, A22p, T20, T21, X20 */
 120 IBM_HANDLE(bled, ec,   "BLED");    /* A22p, T20, T21, X20 */
 121 IBM_HANDLE(beep, ec,   "BEEP");    /* all models */
 122
 123 struct ibm_struct {
 124         char *name;
 125
 126         char *hid;
 127         struct acpi_driver *driver;
 128
 129         int  (*init)   (struct ibm_struct *);
 130         int  (*read)   (struct ibm_struct *, char *);
 131         int  (*write)  (struct ibm_struct *, char *);
 132         void (*exit)   (struct ibm_struct *);
 133
 134         void (*notify) (struct ibm_struct *, u32);
 135         acpi_handle *handle;
 136         int type;
 137         struct acpi_device *device;
 138
 139         int driver_registered;
 140         int proc_created;
 141         int init_called;
 142         int notify_installed;
 143
 144         int supported;
 145         union {
 146                 struct {
 147                         int status;
 148                         int mask;
 149                 } hotkey;
 150                 struct {
 151                         int autoswitch;
 152                 } video;
 153         } state;
 154
 155         int experimental;
 156 };
 157
 158 static struct proc_dir_entry *proc_dir = NULL;
 159
 160 #define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
 161 #define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
 162 #define strlencmp(a,b) (strncmp((a), (b), strlen(b)))
 163
 164 static int acpi_evalf(acpi_handle handle,
 165                       void *res, char *method, char *fmt, ...)
 166 {
 167         char *fmt0 = fmt;
 168         struct acpi_object_list params;
 169         union acpi_object       in_objs[IBM_MAX_ACPI_ARGS];
 170         struct acpi_buffer      result;
 171         union acpi_object       out_obj;
 172         acpi_status             status;
 173         va_list                 ap;
 174         char                    res_type;
 175         int                     success;
 176         int                     quiet;
 177
 178         if (!*fmt) {
 179                 printk(IBM_ERR "acpi_evalf() called with empty format\n");
 180                 return 0;
 181         }
 182
 183         if (*fmt == 'q') {
 184                 quiet = 1;
 185                 fmt++;
 186         } else
 187                 quiet = 0;
 188
 189         res_type = *(fmt++);
 190
 191         params.count = 0;
 192         params.pointer = &in_objs[0];
 193
 194         va_start(ap, fmt);
 195         while (*fmt) {
 196                 char c = *(fmt++);
 197                 switch (c) {
 198                 case 'd':       /* int */
 199                         in_objs[params.count].integer.value = va_arg(ap, int);
 200                         in_objs[params.count++].type = ACPI_TYPE_INTEGER;
 201                         break;
 202                 /* add more types as needed */
 203                 default:
 204                         printk(IBM_ERR "acpi_evalf() called "
 205                                "with invalid format character '%c'\n", c);
 206                         return 0;
 207                 }
 208         }
 209         va_end(ap);
 210
 211         result.length = sizeof(out_obj);
 212         result.pointer = &out_obj;
 213
 214         status = acpi_evaluate_object(handle, method, &params, &result);
 215
 216         switch (res_type) {
 217         case 'd':       /* int */
 218                 if (res)
 219                         *(int *)res = out_obj.integer.value;
 220                 success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
 221                 break;
 222         case 'v':       /* void */
 223                 success = status == AE_OK;
 224                 break;
 225         /* add more types as needed */
 226         default:
 227                 printk(IBM_ERR "acpi_evalf() called "
 228                        "with invalid format character '%c'\n", res_type);
 229                 return 0;
 230         }
 231
 232         if (!success && !quiet)
 233                 printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
 234                        method, fmt0, status);
 235
 236         return success;
 237 }
 238
 239 static void __unused acpi_print_int(acpi_handle handle, char *method)
 240 {
 241         int i;
 242
 243         if (acpi_evalf(handle, &i, method, "d"))
 244                 printk(IBM_INFO "%s = 0x%x\n", method, i);
 245         else
 246                 printk(IBM_ERR "error calling %s\n", method);
 247 }
 248
 249 static char *next_cmd(char **cmds)
 250 {
 251         char *start = *cmds;
 252         char *end;
 253
 254         while ((end = strchr(start, ',')) && end == start)
 255                 start = end + 1;
 256
 257         if (!end)
 258                 return NULL;
 259
 260         *end = 0;
 261         *cmds = end + 1;
 262         return start;
 263 }
 264
 265 static int driver_init(struct ibm_struct *ibm)
 266 {
 267         printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
 268         printk(IBM_INFO "%s\n", IBM_URL);
 269
 270         return 0;
 271 }
 272
 273 static int driver_read(struct ibm_struct *ibm, char *p)
 274 {
 275         int len = 0;
 276
 277         len += sprintf(p + len, "driver:\t\t%s\n", IBM_DESC);
 278         len += sprintf(p + len, "version:\t%s\n", IBM_VERSION);
 279
 280         return len;
 281 }
 282
 283 static int hotkey_get(struct ibm_struct *ibm, int *status, int *mask)
 284 {
 285         if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
 286                 return -EIO;
 287         if (ibm->supported) {
 288                 if (!acpi_evalf(hkey_handle, mask, "DHKN", "qd"))
 289                         return -EIO;
 290         } else {
 291                 *mask = ibm->state.hotkey.mask;
 292         }
 293         return 0;
 294 }
 295
 296 static int hotkey_set(struct ibm_struct *ibm, int status, int mask)
 297 {
 298         int i;
 299
 300         if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
 301                 return -EIO;
 302
 303         if (!ibm->supported)
 304                 return 0;
 305
 306         for (i=0; i<32; i++) {
 307                 int bit = ((1 << i) & mask) != 0;
 308                 if (!acpi_evalf(hkey_handle, NULL, "MHKM", "vdd", i+1, bit))
 309                         return -EIO;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int hotkey_init(struct ibm_struct *ibm)
 316 {
 317         int ret;
 318
 319         ibm->supported = 1;
 320         ret = hotkey_get(ibm,
 321                          &ibm->state.hotkey.status,
 322                          &ibm->state.hotkey.mask);
 323         if (ret < 0) {
 324                 /* mask not supported on A21e, A22p, T20, T21, X20, X22, X24 */
 325                 ibm->supported = 0;
 326                 ret = hotkey_get(ibm,
 327                                  &ibm->state.hotkey.status,
 328                                  &ibm->state.hotkey.mask);
 329         }
 330
 331         return ret;
 332 }
 333
 334 static int hotkey_read(struct ibm_struct *ibm, char *p)
 335 {
 336         int status, mask;
 337         int len = 0;
 338
 339         if (hotkey_get(ibm, &status, &mask) < 0)
 340                 return -EIO;
 341
 342         len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
 343         if (ibm->supported) {
 344                 len += sprintf(p + len, "mask:\t\t0x%04x\n", mask);
 345                 len += sprintf(p + len,
 346                                "commands:\tenable, disable, reset, <mask>\n");
 347         } else {
 348                 len += sprintf(p + len, "mask:\t\tnot supported\n");
 349                 len += sprintf(p + len, "commands:\tenable, disable, reset\n");
 350         }
 351
 352         return len;
 353 }
 354
 355 static int hotkey_write(struct ibm_struct *ibm, char *buf)
 356 {
 357         int status, mask;
 358         char *cmd;
 359         int do_cmd = 0;
 360
 361         if (hotkey_get(ibm, &status, &mask) < 0)
 362                 return -ENODEV;
 363
 364         while ((cmd = next_cmd(&buf))) {
 365                 if (strlencmp(cmd, "enable") == 0) {
 366                         status = 1;
 367                 } else if (strlencmp(cmd, "disable") == 0) {
 368                         status = 0;
 369                 } else if (strlencmp(cmd, "reset") == 0) {
 370                         status = ibm->state.hotkey.status;
 371                         mask   = ibm->state.hotkey.mask;
 372                 } else if (sscanf(cmd, "0x%x", &mask) == 1) {
 373                         /* mask set */
 374                 } else if (sscanf(cmd, "%x", &mask) == 1) {
 375                         /* mask set */
 376                 } else
 377                         return -EINVAL;
 378                 do_cmd = 1;
 379         }
 380
 381         if (do_cmd && hotkey_set(ibm, status, mask) < 0)
 382                 return -EIO;
 383
 384         return 0;
 385 }
 386
 387 static void hotkey_exit(struct ibm_struct *ibm)
 388 {
 389         hotkey_set(ibm, ibm->state.hotkey.status, ibm->state.hotkey.mask);
 390 }
 391
 392 static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 393 {
 394         int hkey;
 395
 396         if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
 397                 acpi_bus_generate_event(ibm->device, event, hkey);
 398         else {
 399                 printk(IBM_ERR "unknown hotkey event %d\n", event);
 400                 acpi_bus_generate_event(ibm->device, event, 0);
 401         }
 402 }
 403
 404 static int bluetooth_init(struct ibm_struct *ibm)
 405 {
 406         /* bluetooth not supported on A21e, G40, T20, T21, X20 */
 407         ibm->supported = acpi_evalf(hkey_handle, NULL, "GBDC", "qv");
 408
 409         return 0;
 410 }
 411
 412 static int bluetooth_status(struct ibm_struct *ibm)
 413 {
 414         int status;
 415
 416         if (!ibm->supported || !acpi_evalf(hkey_handle, &status, "GBDC", "d"))
 417                 status = 0;
 418
 419         return status;
 420 }
 421
 422 static int bluetooth_read(struct ibm_struct *ibm, char *p)
 423 {
 424         int len = 0;
 425         int status = bluetooth_status(ibm);
 426
 427         if (!ibm->supported)
 428                 len += sprintf(p + len, "status:\t\tnot supported\n");
 429         else if (!(status & 1))
 430                 len += sprintf(p + len, "status:\t\tnot installed\n");
 431         else {
 432                 len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
 433                 len += sprintf(p + len, "commands:\tenable, disable\n");
 434         }
 435
 436         return len;
 437 }
 438
 439 static int bluetooth_write(struct ibm_struct *ibm, char *buf)
 440 {
 441         int status = bluetooth_status(ibm);
 442         char *cmd;
 443         int do_cmd = 0;
 444
 445         if (!ibm->supported)
 446                 return -EINVAL;
 447
 448         while ((cmd = next_cmd(&buf))) {
 449                 if (strlencmp(cmd, "enable") == 0) {
 450                         status |= 2;
 451                 } else if (strlencmp(cmd, "disable") == 0) {
 452                         status &= ~2;
 453                 } else
 454                         return -EINVAL;
 455                 do_cmd = 1;
 456         }
 457
 458         if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
 459             return -EIO;
 460
 461         return 0;
 462 }
 463
 464 static int video_init(struct ibm_struct *ibm)
 465 {
 466         if (!acpi_evalf(vid_handle,
 467                         &ibm->state.video.autoswitch, "^VDEE", "d"))
 468                 return -ENODEV;
 469
 470         return 0;
 471 }
 472
 473 static int video_status(struct ibm_struct *ibm)
 474 {
 475         int status = 0;
 476         int i;
 477
 478         acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1);
 479         if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
 480                 status |= 0x02 * i;
 481
 482         acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0);
 483         if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
 484                 status |= 0x01 * i;
 485         if (acpi_evalf(NULL, &i, "\\VCDD", "d"))
 486                 status |= 0x08 * i;
 487
 488         if (acpi_evalf(vid_handle, &i, "^VDEE", "d"))
 489                 status |= 0x10 * (i & 1);
 490
 491         return status;
 492 }
 493
 494 static int video_read(struct ibm_struct *ibm, char *p)
 495 {
 496         int status = video_status(ibm);
 497         int len = 0;
 498
 499         len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
 500         len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
 501         len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
 502         len += sprintf(p + len, "auto:\t\t%s\n", enabled(status, 4));
 503         len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable, "
 504                        "crt_enable, crt_disable\n");
 505         len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable, "
 506                        "auto_enable, auto_disable\n");
 507         len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
 508
 509         return len;
 510 }
 511
 512 static int video_write(struct ibm_struct *ibm, char *buf)
 513 {
 514         char *cmd;
 515         int enable, disable, status;
 516
 517         enable = disable = 0;
 518
 519         while ((cmd = next_cmd(&buf))) {
 520                 if (strlencmp(cmd, "lcd_enable") == 0) {
 521                         enable |= 0x01;
 522                 } else if (strlencmp(cmd, "lcd_disable") == 0) {
 523                         disable |= 0x01;
 524                 } else if (strlencmp(cmd, "crt_enable") == 0) {
 525                         enable |= 0x02;
 526                 } else if (strlencmp(cmd, "crt_disable") == 0) {
 527                         disable |= 0x02;
 528                 } else if (strlencmp(cmd, "dvi_enable") == 0) {
 529                         enable |= 0x08;
 530                 } else if (strlencmp(cmd, "dvi_disable") == 0) {
 531                         disable |= 0x08;
 532                 } else if (strlencmp(cmd, "auto_enable") == 0) {
 533                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 534                                 return -EIO;
 535                 } else if (strlencmp(cmd, "auto_disable") == 0) {
 536                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 0))
 537                                 return -EIO;
 538                 } else if (strlencmp(cmd, "video_switch") == 0) {
 539                         int autoswitch;
 540                         if (!acpi_evalf(vid_handle, &autoswitch, "^VDEE", "d"))
 541                                 return -EIO;
 542                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 543                                 return -EIO;
 544                         if (!acpi_evalf(vid_handle, NULL, "VSWT", "v"))
 545                                 return -EIO;
 546                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd",
 547                                         autoswitch))
 548                                 return -EIO;
 549                 } else if (strlencmp(cmd, "expand_toggle") == 0) {
 550                         if (!acpi_evalf(NULL, NULL, "\\VEXP", "v"))
 551                                 return -EIO;
 552                 } else
 553                         return -EINVAL;
 554         }
 555
 556         if (enable || disable) {
 557                 status = (video_status(ibm) & 0x0f & ~disable) | enable;
 558                 if (!acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80))
 559                         return -EIO;
 560                 if (!acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1))
 561                         return -EIO;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static void video_exit(struct ibm_struct *ibm)
 568 {
 569         acpi_evalf(vid_handle, NULL, "_DOS", "vd",
 570                    ibm->state.video.autoswitch);
 571 }
 572
 573 static int light_init(struct ibm_struct *ibm)
 574 {
 575         /* kblt not supported on G40, R32, X20 */
 576         ibm->supported = acpi_evalf(ec_handle, NULL, "KBLT", "qv");
 577
 578         return 0;
 579 }
 580
 581 static int light_read(struct ibm_struct *ibm, char *p)
 582 {
 583         int len = 0;
 584         int status = 0;
 585
 586         if (ibm->supported) {
 587                 if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
 588                         return -EIO;
 589                 len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
 590         } else
 591                 len += sprintf(p + len, "status:\t\tunknown\n");
 592
 593         len += sprintf(p + len, "commands:\ton, off\n");
 594
 595         return len;
 596 }
 597
 598 static int light_write(struct ibm_struct *ibm, char *buf)
 599 {
 600         int cmos_cmd, lght_cmd;
 601         char *cmd;
 602         int success;
 603
 604         while ((cmd = next_cmd(&buf))) {
 605                 if (strlencmp(cmd, "on") == 0) {
 606                         cmos_cmd = 0x0c;
 607                         lght_cmd = 1;
 608                 } else if (strlencmp(cmd, "off") == 0) {
 609                         cmos_cmd = 0x0d;
 610                         lght_cmd = 0;
 611                 } else
 612                         return -EINVAL;
 613
 614                 success = cmos_handle ?
 615                         acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd) :
 616                         acpi_evalf(lght_handle, NULL, NULL, "vd", lght_cmd);
 617                 if (!success)
 618                         return -EIO;
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int _sta(acpi_handle handle)
 625 {
 626         int status;
 627
 628         if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
 629                 status = 0;
 630
 631         return status;
 632 }
 633
 634 #define dock_docked() (_sta(dock_handle) & 1)
 635
 636 static int dock_read(struct ibm_struct *ibm, char *p)
 637 {
 638         int len = 0;
 639         int docked = dock_docked();
 640
 641         if (!dock_handle)
 642                 len += sprintf(p + len, "status:\t\tnot supported\n");
 643         else if (!docked)
 644                 len += sprintf(p + len, "status:\t\tundocked\n");
 645         else {
 646                 len += sprintf(p + len, "status:\t\tdocked\n");
 647                 len += sprintf(p + len, "commands:\tdock, undock\n");
 648         }
 649
 650         return len;
 651 }
 652
 653 static int dock_write(struct ibm_struct *ibm, char *buf)
 654 {
 655         char *cmd;
 656
 657         if (!dock_docked())
 658                 return -EINVAL;
 659
 660         while ((cmd = next_cmd(&buf))) {
 661                 if (strlencmp(cmd, "undock") == 0) {
 662                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0))
 663                                 return -EIO;
 664                         if (!acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
 665                                 return -EIO;
 666                 } else if (strlencmp(cmd, "dock") == 0) {
 667                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
 668                                 return -EIO;
 669                 } else
 670                         return -EINVAL;
 671         }
 672
 673         return 0;
 674 }
 675
 676 static void dock_notify(struct ibm_struct *ibm, u32 event)
 677 {
 678         int docked = dock_docked();
 679
 680         if (event == 3 && docked)
 681                 acpi_bus_generate_event(ibm->device, event, 1); /* button */
 682         else if (event == 3 && !docked)
 683                 acpi_bus_generate_event(ibm->device, event, 2); /* undock */
 684         else if (event == 0 && docked)
 685                 acpi_bus_generate_event(ibm->device, event, 3); /* dock */
 686         else {
 687                 printk(IBM_ERR "unknown dock event %d, status %d\n",
 688                        event, _sta(dock_handle));
 689                 acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
 690         }
 691 }
 692
 693 #define bay_occupied() (_sta(bay_handle) & 1)
 694
 695 static int bay_init(struct ibm_struct *ibm)
 696 {
 697         /* bay not supported on A21e, A22p, A31, A31p, G40, R32, R40e */
 698         ibm->supported = bay_handle && bayej_handle &&
 699                 acpi_evalf(bay_handle, NULL, "_STA", "qv");
 700
 701         return 0;
 702 }
 703
 704 static int bay_read(struct ibm_struct *ibm, char *p)
 705 {
 706         int len = 0;
 707         int occupied = bay_occupied();
 708
 709         if (!ibm->supported)
 710                 len += sprintf(p + len, "status:\t\tnot supported\n");
 711         else if (!occupied)
 712                 len += sprintf(p + len, "status:\t\tunoccupied\n");
 713         else {
 714                 len += sprintf(p + len, "status:\t\toccupied\n");
 715                 len += sprintf(p + len, "commands:\teject\n");
 716         }
 717
 718         return len;
 719 }
 720
 721 static int bay_write(struct ibm_struct *ibm, char *buf)
 722 {
 723         char *cmd;
 724
 725         while ((cmd = next_cmd(&buf))) {
 726                 if (strlencmp(cmd, "eject") == 0) {
 727                         if (!ibm->supported ||
 728                             !acpi_evalf(bay_handle, NULL, "_EJ0", "vd", 1))
 729                                 return -EIO;
 730                 } else
 731                         return -EINVAL;
 732         }
 733
 734         return 0;
 735 }
 736
 737 static void bay_notify(struct ibm_struct *ibm, u32 event)
 738 {
 739         acpi_bus_generate_event(ibm->device, event, 0);
 740 }
 741
 742 static int cmos_read(struct ibm_struct *ibm, char *p)
 743 {
 744         int len = 0;
 745
 746         /* cmos not supported on A21e, A22p, T20, T21, X20 */
 747         if (!cmos_handle)
 748                 len += sprintf(p + len, "status:\t\tnot supported\n");
 749         else {
 750                 len += sprintf(p + len, "status:\t\tsupported\n");
 751                 len += sprintf(p + len, "commands:\t<int>\n");
 752         }
 753
 754         return len;
 755 }
 756
 757 static int cmos_write(struct ibm_struct *ibm, char *buf)
 758 {
 759         char *cmd;
 760         int cmos_cmd;
 761
 762         if (!cmos_handle)
 763                 return -EINVAL;
 764
 765         while ((cmd = next_cmd(&buf))) {
 766                 if (sscanf(cmd, "%u", &cmos_cmd) == 1) {
 767                         /* cmos_cmd set */
 768                 } else
 769                         return -EINVAL;
 770
 771                 if (!acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd))
 772                         return -EIO;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static int led_read(struct ibm_struct *ibm, char *p)
 779 {
 780         int len = 0;
 781
 782         len += sprintf(p + len, "commands:\t"
 783                        "<int> on, <int> off, <int> blink\n");
 784
 785         return len;
 786 }
 787
 788 static int led_write(struct ibm_struct *ibm, char *buf)
 789 {
 790         char *cmd;
 791         unsigned int led;
 792         int led_cmd, sysl_cmd, bled_a, bled_b;
 793
 794         while ((cmd = next_cmd(&buf))) {
 795                 if (sscanf(cmd, "%u", &led) != 1)
 796                         return -EINVAL;
 797
 798                 if (strstr(cmd, "blink")) {
 799                         led_cmd = 0xc0;
 800                         sysl_cmd = 2;
 801                         bled_a = 2;
 802                         bled_b = 1;
 803                 } else if (strstr(cmd, "on")) {
 804                         led_cmd = 0x80;
 805                         sysl_cmd = 1;
 806                         bled_a = 2;
 807                         bled_b = 0;
 808                 } else if (strstr(cmd, "off")) {
 809                         led_cmd = sysl_cmd = bled_a = bled_b = 0;
 810                 } else
 811                         return -EINVAL;
 812
 813                 if (led_handle) {
 814                         if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
 815                                         led, led_cmd))
 816                                 return -EIO;
 817                 } else if (led < 2) {
 818                         if (acpi_evalf(sysl_handle, NULL, NULL, "vdd",
 819                                        led, sysl_cmd))
 820                                 return -EIO;
 821                 } else if (led == 2 && bled_handle) {
 822                         if (acpi_evalf(bled_handle, NULL, NULL, "vdd",
 823                                        bled_a, bled_b))
 824                                 return -EIO;
 825                 } else
 826                         return -EINVAL;
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int beep_read(struct ibm_struct *ibm, char *p)
 833 {
 834         int len = 0;
 835
 836         len += sprintf(p + len, "commands:\t<int>\n");
 837
 838         return len;
 839 }
 840
 841 static int beep_write(struct ibm_struct *ibm, char *buf)
 842 {
 843         char *cmd;
 844         int beep_cmd;
 845
 846         while ((cmd = next_cmd(&buf))) {
 847                 if (sscanf(cmd, "%u", &beep_cmd) == 1) {
 848                         /* beep_cmd set */
 849                 } else
 850                         return -EINVAL;
 851
 852                 if (!acpi_evalf(beep_handle, NULL, NULL, "vd", beep_cmd))
 853                         return -EIO;
 854         }
 855
 856         return 0;
 857 }
 858
 859 static struct ibm_struct ibms[] = {
 860         {
 861                 .name   = "driver",
 862                 .init   = driver_init,
 863                 .read   = driver_read,
 864         },
 865         {
 866                 .name   = "hotkey",
 867                 .hid    = "IBM0068",
 868                 .init   = hotkey_init,
 869                 .read   = hotkey_read,
 870                 .write  = hotkey_write,
 871                 .exit   = hotkey_exit,
 872                 .notify = hotkey_notify,
 873                 .handle = &hkey_handle,
 874                 .type   = ACPI_DEVICE_NOTIFY,
 875         },
 876         {
 877                 .name   = "bluetooth",
 878                 .init   = bluetooth_init,
 879                 .read   = bluetooth_read,
 880                 .write  = bluetooth_write,
 881         },
 882         {
 883                 .name   = "video",
 884                 .init   = video_init,
 885                 .read   = video_read,
 886                 .write  = video_write,
 887                 .exit   = video_exit,
 888         },
 889         {
 890                 .name   = "light",
 891                 .init   = light_init,
 892                 .read   = light_read,
 893                 .write  = light_write,
 894         },
 895         {
 896                 .name   = "dock",
 897                 .read   = dock_read,
 898                 .write  = dock_write,
 899                 .notify = dock_notify,
 900                 .handle = &dock_handle,
 901                 .type   = ACPI_SYSTEM_NOTIFY,
 902         },
 903         {
 904                 .name   = "bay",
 905                 .init   = bay_init,
 906                 .read   = bay_read,
 907                 .write  = bay_write,
 908                 .notify = bay_notify,
 909                 .handle = &bay_handle,
 910                 .type   = ACPI_SYSTEM_NOTIFY,
 911         },
 912         {
 913                 .name   = "cmos",
 914                 .read   = cmos_read,
 915                 .write  = cmos_write,
 916                 .experimental = 1,
 917         },
 918         {
 919                 .name   = "led",
 920                 .read   = led_read,
 921                 .write  = led_write,
 922                 .experimental = 1,
 923         },
 924         {
 925                 .name   = "beep",
 926                 .read   = beep_read,
 927                 .write  = beep_write,
 928                 .experimental = 1,
 929         },
 930 };
 931 #define NUM_IBMS (sizeof(ibms)/sizeof(ibms[0]))
 932
 933 static int dispatch_read(char *page, char **start, off_t off, int count,
 934                          int *eof, void *data)
 935 {
 936         struct ibm_struct *ibm = (struct ibm_struct *)data;
 937         int len;
 938
 939         if (!ibm || !ibm->read)
 940                 return -EINVAL;
 941
 942         len = ibm->read(ibm, page);
 943         if (len < 0)
 944                 return len;
 945
 946         if (len <= off + count)
 947                 *eof = 1;
 948         *start = page + off;
 949         len -= off;
 950         if (len > count)
 951                 len = count;
 952         if (len < 0)
 953                 len = 0;
 954
 955         return len;
 956 }
 957
 958 static int dispatch_write(struct file *file, const char __user *userbuf,
 959                           unsigned long count, void *data)
 960 {
 961         struct ibm_struct *ibm = (struct ibm_struct *)data;
 962         char *kernbuf;
 963         int ret;
 964
 965         if (!ibm || !ibm->write)
 966                 return -EINVAL;
 967
 968         kernbuf = kmalloc(count + 2, GFP_KERNEL);
 969         if (!kernbuf)
 970                 return -ENOMEM;
 971
 972         if (copy_from_user(kernbuf, userbuf, count)) {
 973                 kfree(kernbuf);
 974                 return -EFAULT;
 975         }
 976
 977         kernbuf[count] = 0;
 978         strcat(kernbuf, ",");
 979         ret = ibm->write(ibm, kernbuf);
 980         if (ret == 0)
 981                 ret = count;
 982
 983         kfree(kernbuf);
 984
 985         return ret;
 986 }
 987
 988 static void dispatch_notify(acpi_handle handle, u32 event, void *data)
 989 {
 990         struct ibm_struct *ibm = (struct ibm_struct *)data;
 991
 992         if (!ibm || !ibm->notify)
 993                 return;
 994
 995         ibm->notify(ibm, event);
 996 }
 997
 998 static int setup_notify(struct ibm_struct *ibm)
 999 {
1000         acpi_status status;
1001         int ret;
1002
1003         if (!*ibm->handle)
1004                 return 0;
1005
1006         ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
1007         if (ret < 0) {
1008                 printk(IBM_ERR "%s device not present\n", ibm->name);
1009                 return 0;
1010         }
1011
1012         acpi_driver_data(ibm->device) = ibm;
1013         sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
1014
1015         status = acpi_install_notify_handler(*ibm->handle, ibm->type,
1016                                              dispatch_notify, ibm);
1017         if (ACPI_FAILURE(status)) {
1018                 printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
1019                        ibm->name, status);
1020                 return -ENODEV;
1021         }
1022
1023         ibm->notify_installed = 1;
1024
1025         return 0;
1026 }
1027
1028 static int ibmacpi_device_add(struct acpi_device *device)
1029 {
1030         return 0;
1031 }
1032
1033 static int register_driver(struct ibm_struct *ibm)
1034 {
1035         int ret;
1036
1037         ibm->driver = kmalloc(sizeof(struct acpi_driver), GFP_KERNEL);
1038         if (!ibm->driver) {
1039                 printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
1040                 return -1;
1041         }
1042
1043         memset(ibm->driver, 0, sizeof(struct acpi_driver));
1044         sprintf(ibm->driver->name, "%s/%s", IBM_NAME, ibm->name);
1045         ibm->driver->ids = ibm->hid;
1046         ibm->driver->ops.add = &ibmacpi_device_add;
1047
1048         ret = acpi_bus_register_driver(ibm->driver);
1049         if (ret < 0) {
1050                 printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
1051                        ibm->hid, ret);
1052                 kfree(ibm->driver);
1053         }
1054
1055         return ret;
1056 }
1057
1058 static int ibm_init(struct ibm_struct *ibm)
1059 {
1060         int ret;
1061         struct proc_dir_entry *entry;
1062
1063         if (ibm->experimental && !experimental)
1064                 return 0;
1065
1066         if (ibm->hid) {
1067                 ret = register_driver(ibm);
1068                 if (ret < 0)
1069                         return ret;
1070                 ibm->driver_registered = 1;
1071         }
1072
1073         if (ibm->init) {
1074                 ret = ibm->init(ibm);
1075                 if (ret != 0)
1076                         return ret;
1077                 ibm->init_called = 1;
1078         }
1079
1080         entry = create_proc_entry(ibm->name, S_IFREG | S_IRUGO | S_IWUSR,
1081                                   proc_dir);
1082         if (!entry) {
1083                 printk(IBM_ERR "unable to create proc entry %s\n", ibm->name);
1084                 return -ENODEV;
1085         }
1086         entry->owner = THIS_MODULE;
1087         ibm->proc_created = 1;
1088
1089         entry->data = ibm;
1090         if (ibm->read)
1091                 entry->read_proc = &dispatch_read;
1092         if (ibm->write)
1093                 entry->write_proc = &dispatch_write;
1094
1095         if (ibm->notify) {
1096                 ret = setup_notify(ibm);
1097                 if (ret < 0)
1098                         return ret;
1099         }
1100
1101         return 0;
1102 }
1103
1104 static void ibm_exit(struct ibm_struct *ibm)
1105 {
1106         if (ibm->notify_installed)
1107                 acpi_remove_notify_handler(*ibm->handle, ibm->type,
1108                                            dispatch_notify);
1109
1110         if (ibm->proc_created)
1111                 remove_proc_entry(ibm->name, proc_dir);
1112
1113         if (ibm->init_called && ibm->exit)
1114                 ibm->exit(ibm);
1115
1116         if (ibm->driver_registered) {
1117                 acpi_bus_unregister_driver(ibm->driver);
1118                 kfree(ibm->driver);
1119         }
1120 }
1121
1122 static int ibm_handle_init(char *name,
1123                            acpi_handle *handle, acpi_handle parent,
1124                            char **paths, int num_paths, int required)
1125 {
1126         int i;
1127         acpi_status status;
1128
1129         for (i=0; i<num_paths; i++) {
1130                 status = acpi_get_handle(parent, paths[i], handle);
1131                 if (ACPI_SUCCESS(status))
1132                         return 0;
1133         }
1134
1135         *handle = NULL;
1136
1137         if (required) {
1138                 printk(IBM_ERR "%s object not found\n", name);
1139                 return -1;
1140         }
1141
1142         return 0;
1143 }
1144
1145 #define IBM_HANDLE_INIT(object, required)                               \
1146         ibm_handle_init(#object, &object##_handle, *object##_parent,    \
1147                 object##_paths, sizeof(object##_paths)/sizeof(char*), required)
1148
1149
1150 static int set_ibm_param(const char *val, struct kernel_param *kp)
1151 {
1152         unsigned int i;
1153         char arg_with_comma[32];
1154
1155         if (strlen(val) > 30)
1156                 return -ENOSPC;
1157
1158         strcpy(arg_with_comma, val);
1159         strcat(arg_with_comma, ",");
1160
1161         for (i=0; i<NUM_IBMS; i++)
1162                 if (strcmp(ibms[i].name, kp->name) == 0)
1163                         return ibms[i].write(&ibms[i], arg_with_comma);
1164         BUG();
1165         return -EINVAL;
1166 }
1167
1168 #define IBM_PARAM(feature) \
1169         module_param_call(feature, set_ibm_param, NULL, NULL, 0)
1170
1171 static void acpi_ibm_exit(void)
1172 {
1173         int i;
1174
1175         for (i=NUM_IBMS-1; i>=0; i--)
1176                 ibm_exit(&ibms[i]);
1177
1178         remove_proc_entry(IBM_DIR, acpi_root_dir);
1179 }
1180
1181 static int __init acpi_ibm_init(void)
1182 {
1183         int ret, i;
1184
1185         if (acpi_disabled)
1186                 return -ENODEV;
1187
1188         if (!acpi_specific_hotkey_enabled){
1189                 printk(IBM_ERR "Using generic hotkey driver\n");
1190                 return -ENODEV;
1191         }
1192         /* these handles are required */
1193         if (IBM_HANDLE_INIT(ec,   1) < 0 ||
1194             IBM_HANDLE_INIT(hkey, 1) < 0 ||
1195             IBM_HANDLE_INIT(vid,  1) < 0 ||
1196             IBM_HANDLE_INIT(beep, 1) < 0)
1197                 return -ENODEV;
1198
1199         /* these handles have alternatives */
1200         IBM_HANDLE_INIT(lght, 0);
1201         if (IBM_HANDLE_INIT(cmos, !lght_handle) < 0)
1202                 return -ENODEV;
1203         IBM_HANDLE_INIT(sysl, 0);
1204         if (IBM_HANDLE_INIT(led, !sysl_handle) < 0)
1205                 return -ENODEV;
1206
1207         /* these handles are not required */
1208         IBM_HANDLE_INIT(dock,  0);
1209         IBM_HANDLE_INIT(bay,   0);
1210         IBM_HANDLE_INIT(bayej, 0);
1211         IBM_HANDLE_INIT(bled,  0);
1212
1213         proc_dir = proc_mkdir(IBM_DIR, acpi_root_dir);
1214         if (!proc_dir) {
1215                 printk(IBM_ERR "unable to create proc dir %s", IBM_DIR);
1216                 return -ENODEV;
1217         }
1218         proc_dir->owner = THIS_MODULE;
1219
1220         for (i=0; i<NUM_IBMS; i++) {
1221                 ret = ibm_init(&ibms[i]);
1222                 if (ret < 0) {
1223                         acpi_ibm_exit();
1224                         return ret;
1225                 }
1226         }
1227
1228         return 0;
1229 }
1230
1231 module_init(acpi_ibm_init);
1232 module_exit(acpi_ibm_exit);
1233
1234 MODULE_AUTHOR("Borislav Deianov");
1235 MODULE_DESCRIPTION(IBM_DESC);
1236 MODULE_LICENSE("GPL");
1237
1238 IBM_PARAM(hotkey);
1239 IBM_PARAM(bluetooth);
1240 IBM_PARAM(video);
1241 IBM_PARAM(light);
1242 IBM_PARAM(dock);
1243 IBM_PARAM(bay);
1244 IBM_PARAM(cmos);
1245 IBM_PARAM(led);
1246 IBM_PARAM(beep);