drivers/acpi/ibm_acpi.c

   1 /*
   2  *  ibm_acpi.c - IBM ThinkPad ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2004-2005 Borislav Deianov <borislav@users.sf.net>
   6  *  Copyright (C) 2006 Henrique de Moraes Holschuh <hmh@hmh.eng.br>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #define IBM_VERSION "0.13"
  24
  25 /*
  26  *  Changelog:
  27  *
  28  *  2006-11-22  0.13    new maintainer
  29  *                      changelog now lives in git commit history, and will
  30  *                      not be updated further in-file.
  31  *
  32  *  2005-08-17  0.12    fix compilation on 2.6.13-rc kernels
  33  *  2005-03-17  0.11    support for 600e, 770x
  34  *                          thanks to Jamie Lentin <lentinj@dial.pipex.com>
  35  *                      support for 770e, G41
  36  *                      G40 and G41 don't have a thinklight
  37  *                      temperatures no longer experimental
  38  *                      experimental brightness control
  39  *                      experimental volume control
  40  *                      experimental fan enable/disable
  41  *  2005-01-16  0.10    fix module loading on R30, R31
  42  *  2005-01-16  0.9     support for 570, R30, R31
  43  *                      ultrabay support on A22p, A3x
  44  *                      limit arg for cmos, led, beep, drop experimental status
  45  *                      more capable led control on A21e, A22p, T20-22, X20
  46  *                      experimental temperatures and fan speed
  47  *                      experimental embedded controller register dump
  48  *                      mark more functions as __init, drop incorrect __exit
  49  *                      use MODULE_VERSION
  50  *                          thanks to Henrik Brix Andersen <brix@gentoo.org>
  51  *                      fix parameter passing on module loading
  52  *                          thanks to Rusty Russell <rusty@rustcorp.com.au>
  53  *                          thanks to Jim Radford <radford@blackbean.org>
  54  *  2004-11-08  0.8     fix init error case, don't return from a macro
  55  *                          thanks to Chris Wright <chrisw@osdl.org>
  56  *  2004-10-23  0.7     fix module loading on A21e, A22p, T20, T21, X20
  57  *                      fix led control on A21e
  58  *  2004-10-19  0.6     use acpi_bus_register_driver() to claim HKEY device
  59  *  2004-10-18  0.5     thinklight support on A21e, G40, R32, T20, T21, X20
  60  *                      proc file format changed
  61  *                      video_switch command
  62  *                      experimental cmos control
  63  *                      experimental led control
  64  *                      experimental acpi sounds
  65  *  2004-09-16  0.4     support for module parameters
  66  *                      hotkey mask can be prefixed by 0x
  67  *                      video output switching
  68  *                      video expansion control
  69  *                      ultrabay eject support
  70  *                      removed lcd brightness/on/off control, didn't work
  71  *  2004-08-17  0.3     support for R40
  72  *                      lcd off, brightness control
  73  *                      thinklight on/off
  74  *  2004-08-14  0.2     support for T series, X20
  75  *                      bluetooth enable/disable
  76  *                      hotkey events disabled by default
  77  *                      removed fan control, currently useless
  78  *  2004-08-09  0.1     initial release, support for X series
  79  */
  80
  81 #include <linux/kernel.h>
  82 #include <linux/module.h>
  83 #include <linux/init.h>
  84 #include <linux/types.h>
  85 #include <linux/string.h>
  86
  87 #include <linux/proc_fs.h>
  88 #include <linux/backlight.h>
  89 #include <asm/uaccess.h>
  90
  91 #include <linux/dmi.h>
  92 #include <linux/jiffies.h>
  93 #include <linux/workqueue.h>
  94
  95 #include <acpi/acpi_drivers.h>
  96 #include <acpi/acnamesp.h>
  97
  98 #define IBM_NAME "ibm"
  99 #define IBM_DESC "IBM ThinkPad ACPI Extras"
 100 #define IBM_FILE "ibm_acpi"
 101 #define IBM_URL "http://ibm-acpi.sf.net/"
 102
 103 MODULE_AUTHOR("Borislav Deianov, Henrique de Moraes Holschuh");
 104 MODULE_DESCRIPTION(IBM_DESC);
 105 MODULE_VERSION(IBM_VERSION);
 106 MODULE_LICENSE("GPL");
 107
 108 #define IBM_DIR IBM_NAME
 109
 110 #define IBM_LOG IBM_FILE ": "
 111 #define IBM_ERR    KERN_ERR    IBM_LOG
 112 #define IBM_NOTICE KERN_NOTICE IBM_LOG
 113 #define IBM_INFO   KERN_INFO   IBM_LOG
 114 #define IBM_DEBUG  KERN_DEBUG  IBM_LOG
 115
 116 #define IBM_MAX_ACPI_ARGS 3
 117
 118 #define __unused __attribute__ ((unused))
 119
 120 static int experimental;
 121 module_param(experimental, int, 0);
 122
 123 static acpi_handle root_handle = NULL;
 124
 125 #define IBM_HANDLE(object, parent, paths...)                    \
 126         static acpi_handle  object##_handle;                    \
 127         static acpi_handle *object##_parent = &parent##_handle; \
 128         static char        *object##_path;                      \
 129         static char        *object##_paths[] = { paths }
 130
 131 IBM_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0",      /* 240, 240x */
 132            "\\_SB.PCI.ISA.EC",  /* 570 */
 133            "\\_SB.PCI0.ISA0.EC0",       /* 600e/x, 770e, 770x */
 134            "\\_SB.PCI0.ISA.EC", /* A21e, A2xm/p, T20-22, X20-21 */
 135            "\\_SB.PCI0.AD4S.EC0",       /* i1400, R30 */
 136            "\\_SB.PCI0.ICH3.EC0",       /* R31 */
 137            "\\_SB.PCI0.LPC.EC", /* all others */
 138     );
 139
 140 IBM_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",      /* 570 */
 141            "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
 142            "\\_SB.PCI0.VID0",   /* 770e */
 143            "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
 144            "\\_SB.PCI0.AGP.VID",        /* all others */
 145     );                          /* R30, R31 */
 146
 147 IBM_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");  /* G41 */
 148
 149 IBM_HANDLE(cmos, root, "\\UCMS",        /* R50, R50e, R50p, R51, T4x, X31, X40 */
 150            "\\CMOS",            /* A3x, G4x, R32, T23, T30, X22-24, X30 */
 151            "\\CMS",             /* R40, R40e */
 152     );                          /* all others */
 153 #ifdef CONFIG_ACPI_IBM_DOCK
 154 IBM_HANDLE(dock, root, "\\_SB.GDCK",    /* X30, X31, X40 */
 155            "\\_SB.PCI0.DOCK",   /* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
 156            "\\_SB.PCI0.PCI1.DOCK",      /* all others */
 157            "\\_SB.PCI.ISA.SLCE",        /* 570 */
 158     );                          /* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
 159 #endif
 160 IBM_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",        /* 570 */
 161            "\\_SB.PCI0.IDE0.IDES.IDSM", /* 600e/x, 770e, 770x */
 162            "\\_SB.PCI0.SATA.SCND.MSTR", /* T60, X60, Z60 */
 163            "\\_SB.PCI0.IDE0.SCND.MSTR", /* all others */
 164     );                          /* A21e, R30, R31 */
 165
 166 IBM_HANDLE(bay_ej, bay, "_EJ3", /* 600e/x, A2xm/p, A3x */
 167            "_EJ0",              /* all others */
 168     );                          /* 570,A21e,G4x,R30,R31,R32,R40e,R50e */
 169
 170 IBM_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",     /* A3x, R32 */
 171            "\\_SB.PCI0.IDE0.IDEP.IDPS", /* 600e/x, 770e, 770x */
 172     );                          /* all others */
 173
 174 IBM_HANDLE(bay2_ej, bay2, "_EJ3",       /* 600e/x, 770e, A3x */
 175            "_EJ0",              /* 770x */
 176     );                          /* all others */
 177
 178 /* don't list other alternatives as we install a notify handler on the 570 */
 179 IBM_HANDLE(pci, root, "\\_SB.PCI");     /* 570 */
 180
 181 IBM_HANDLE(hkey, ec, "\\_SB.HKEY",      /* 600e/x, 770e, 770x */
 182            "^HKEY",             /* R30, R31 */
 183            "HKEY",              /* all others */
 184     );                          /* 570 */
 185
 186 IBM_HANDLE(lght, root, "\\LGHT");       /* A21e, A2xm/p, T20-22, X20-21 */
 187 IBM_HANDLE(ledb, ec, "LEDB");   /* G4x */
 188
 189 IBM_HANDLE(led, ec, "SLED",     /* 570 */
 190            "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
 191            "LED",               /* all others */
 192     );                          /* R30, R31 */
 193
 194 IBM_HANDLE(beep, ec, "BEEP");   /* all except R30, R31 */
 195 IBM_HANDLE(ecrd, ec, "ECRD");   /* 570 */
 196 IBM_HANDLE(ecwr, ec, "ECWR");   /* 570 */
 197 IBM_HANDLE(fans, ec, "FANS");   /* X31, X40, X41 */
 198
 199 IBM_HANDLE(gfan, ec, "GFAN",    /* 570 */
 200            "\\FSPD",            /* 600e/x, 770e, 770x */
 201     );                          /* all others */
 202
 203 IBM_HANDLE(sfan, ec, "SFAN",    /* 570 */
 204            "JFNS",              /* 770x-JL */
 205     );                          /* all others */
 206
 207 #define IBM_HKEY_HID    "IBM0068"
 208 #define IBM_PCI_HID     "PNP0A03"
 209
 210 enum thermal_access_mode {
 211         IBMACPI_THERMAL_NONE = 0,       /* No thermal support */
 212         IBMACPI_THERMAL_ACPI_TMP07,     /* Use ACPI TMP0-7 */
 213         IBMACPI_THERMAL_ACPI_UPDT,      /* Use ACPI TMP0-7 with UPDT */
 214         IBMACPI_THERMAL_TPEC_8,         /* Use ACPI EC regs, 8 sensors */
 215         IBMACPI_THERMAL_TPEC_16,        /* Use ACPI EC regs, 16 sensors */
 216 };
 217
 218 #define IBMACPI_MAX_THERMAL_SENSORS 16  /* Max thermal sensors supported */
 219 struct ibm_thermal_sensors_struct {
 220         s32 temp[IBMACPI_MAX_THERMAL_SENSORS];
 221 };
 222
 223 /*
 224  * FAN ACCESS MODES
 225  *
 226  * IBMACPI_FAN_RD_ACPI_GFAN:
 227  *      ACPI GFAN method: returns fan level
 228  *
 229  *      see IBMACPI_FAN_WR_ACPI_SFAN
 230  *      EC 0x2f not available if GFAN exists
 231  *
 232  * IBMACPI_FAN_WR_ACPI_SFAN:
 233  *      ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
 234  *
 235  *      EC 0x2f might be available *for reading*, but never for writing.
 236  *
 237  * IBMACPI_FAN_WR_TPEC:
 238  *      ThinkPad EC register 0x2f (HFSP): fan control loop mode Supported
 239  *      on almost all ThinkPads
 240  *
 241  *      Fan speed changes of any sort (including those caused by the
 242  *      disengaged mode) are usually done slowly by the firmware as the
 243  *      maximum ammount of fan duty cycle change per second seems to be
 244  *      limited.
 245  *
 246  *      Reading is not available if GFAN exists.
 247  *      Writing is not available if SFAN exists.
 248  *
 249  *      Bits
 250  *       7      automatic mode engaged;
 251  *              (default operation mode of the ThinkPad)
 252  *              fan level is ignored in this mode.
 253  *       6      disengage mode (takes precedence over bit 7);
 254  *              not available on all thinkpads.  May disable
 255  *              the tachometer, and speeds up fan to 100% duty-cycle,
 256  *              which speeds it up far above the standard RPM
 257  *              levels.  It is not impossible that it could cause
 258  *              hardware damage.
 259  *      5-3     unused in some models.  Extra bits for fan level
 260  *              in others, but still useless as all values above
 261  *              7 map to the same speed as level 7 in these models.
 262  *      2-0     fan level (0..7 usually)
 263  *                      0x00 = stop
 264  *                      0x07 = max (set when temperatures critical)
 265  *              Some ThinkPads may have other levels, see
 266  *              IBMACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
 267  *
 268  *      FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
 269  *      boot. Apparently the EC does not intialize it, so unless ACPI DSDT
 270  *      does so, its initial value is meaningless (0x07).
 271  *
 272  *      For firmware bugs, refer to:
 273  *      http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
 274  *
 275  *      ----
 276  *
 277  *      ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
 278  *      Main fan tachometer reading (in RPM)
 279  *
 280  *      This register is present on all ThinkPads with a new-style EC, and
 281  *      it is known not to be present on the A21m/e, and T22, as there is
 282  *      something else in offset 0x84 according to the ACPI DSDT.  Other
 283  *      ThinkPads from this same time period (and earlier) probably lack the
 284  *      tachometer as well.
 285  *
 286  *      Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
 287  *      was never fixed by IBM to report the EC firmware version string
 288  *      probably support the tachometer (like the early X models), so
 289  *      detecting it is quite hard.  We need more data to know for sure.
 290  *
 291  *      FIRMWARE BUG: always read 0x84 first, otherwise incorrect readings
 292  *      might result.
 293  *
 294  *      FIRMWARE BUG: when EC 0x2f bit 6 is set (disengaged mode), this
 295  *      register is not invalidated in ThinkPads that disable tachometer
 296  *      readings.  Thus, the tachometer readings go stale.
 297  *
 298  *      For firmware bugs, refer to:
 299  *      http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
 300  *
 301  * IBMACPI_FAN_WR_ACPI_FANS:
 302  *      ThinkPad X31, X40, X41.  Not available in the X60.
 303  *
 304  *      FANS ACPI handle: takes three arguments: low speed, medium speed,
 305  *      high speed.  ACPI DSDT seems to map these three speeds to levels
 306  *      as follows: STOP LOW LOW MED MED HIGH HIGH HIGH HIGH
 307  *      (this map is stored on FAN0..FAN8 as "0,1,1,2,2,3,3,3,3")
 308  *
 309  *      The speeds are stored on handles
 310  *      (FANA:FAN9), (FANC:FANB), (FANE:FAND).
 311  *
 312  *      There are three default speed sets, acessible as handles:
 313  *      FS1L,FS1M,FS1H; FS2L,FS2M,FS2H; FS3L,FS3M,FS3H
 314  *
 315  *      ACPI DSDT switches which set is in use depending on various
 316  *      factors.
 317  *
 318  *      IBMACPI_FAN_WR_TPEC is also available and should be used to
 319  *      command the fan.  The X31/X40/X41 seems to have 8 fan levels,
 320  *      but the ACPI tables just mention level 7.
 321  */
 322
 323 enum fan_status_access_mode {
 324         IBMACPI_FAN_NONE = 0,           /* No fan status or control */
 325         IBMACPI_FAN_RD_ACPI_GFAN,       /* Use ACPI GFAN */
 326         IBMACPI_FAN_RD_TPEC,            /* Use ACPI EC regs 0x2f, 0x84-0x85 */
 327 };
 328
 329 enum fan_control_access_mode {
 330         IBMACPI_FAN_WR_NONE = 0,        /* No fan control */
 331         IBMACPI_FAN_WR_ACPI_SFAN,       /* Use ACPI SFAN */
 332         IBMACPI_FAN_WR_TPEC,            /* Use ACPI EC reg 0x2f */
 333         IBMACPI_FAN_WR_ACPI_FANS,       /* Use ACPI FANS and EC reg 0x2f */
 334 };
 335
 336 enum fan_control_commands {
 337         IBMACPI_FAN_CMD_SPEED   = 0x0001,       /* speed command */
 338         IBMACPI_FAN_CMD_LEVEL   = 0x0002,       /* level command  */
 339         IBMACPI_FAN_CMD_ENABLE  = 0x0004,       /* enable/disable cmd,
 340                                                  * and also watchdog cmd */
 341 };
 342
 343 enum {                                  /* Fan control constants */
 344         fan_status_offset = 0x2f,       /* EC register 0x2f */
 345         fan_rpm_offset = 0x84,          /* EC register 0x84: LSB, 0x85 MSB (RPM)
 346                                          * 0x84 must be read before 0x85 */
 347
 348         IBMACPI_FAN_EC_DISENGAGED       = 0x40, /* EC mode: tachometer
 349                                                  * disengaged */
 350         IBMACPI_FAN_EC_AUTO             = 0x80, /* EC mode: auto fan
 351                                                  * control */
 352 };
 353
 354 static char *ibm_thinkpad_ec_found = NULL;
 355
 356 struct ibm_struct {
 357         char *name;
 358         char param[32];
 359
 360         char *hid;
 361         struct acpi_driver *driver;
 362
 363         int (*init) (void);
 364         int (*read) (char *);
 365         int (*write) (char *);
 366         void (*exit) (void);
 367
 368         void (*notify) (struct ibm_struct *, u32);
 369         acpi_handle *handle;
 370         int type;
 371         struct acpi_device *device;
 372
 373         int driver_registered;
 374         int proc_created;
 375         int init_called;
 376         int notify_installed;
 377
 378         int experimental;
 379 };
 380
 381 static struct proc_dir_entry *proc_dir = NULL;
 382
 383 static struct backlight_device *ibm_backlight_device = NULL;
 384
 385 #define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
 386 #define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
 387 #define strlencmp(a,b) (strncmp((a), (b), strlen(b)))
 388
 389 static int acpi_evalf(acpi_handle handle,
 390                       void *res, char *method, char *fmt, ...)
 391 {
 392         char *fmt0 = fmt;
 393         struct acpi_object_list params;
 394         union acpi_object in_objs[IBM_MAX_ACPI_ARGS];
 395         struct acpi_buffer result, *resultp;
 396         union acpi_object out_obj;
 397         acpi_status status;
 398         va_list ap;
 399         char res_type;
 400         int success;
 401         int quiet;
 402
 403         if (!*fmt) {
 404                 printk(IBM_ERR "acpi_evalf() called with empty format\n");
 405                 return 0;
 406         }
 407
 408         if (*fmt == 'q') {
 409                 quiet = 1;
 410                 fmt++;
 411         } else
 412                 quiet = 0;
 413
 414         res_type = *(fmt++);
 415
 416         params.count = 0;
 417         params.pointer = &in_objs[0];
 418
 419         va_start(ap, fmt);
 420         while (*fmt) {
 421                 char c = *(fmt++);
 422                 switch (c) {
 423                 case 'd':       /* int */
 424                         in_objs[params.count].integer.value = va_arg(ap, int);
 425                         in_objs[params.count++].type = ACPI_TYPE_INTEGER;
 426                         break;
 427                         /* add more types as needed */
 428                 default:
 429                         printk(IBM_ERR "acpi_evalf() called "
 430                                "with invalid format character '%c'\n", c);
 431                         return 0;
 432                 }
 433         }
 434         va_end(ap);
 435
 436         if (res_type != 'v') {
 437                 result.length = sizeof(out_obj);
 438                 result.pointer = &out_obj;
 439                 resultp = &result;
 440         } else
 441                 resultp = NULL;
 442
 443         status = acpi_evaluate_object(handle, method, &params, resultp);
 444
 445         switch (res_type) {
 446         case 'd':               /* int */
 447                 if (res)
 448                         *(int *)res = out_obj.integer.value;
 449                 success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
 450                 break;
 451         case 'v':               /* void */
 452                 success = status == AE_OK;
 453                 break;
 454                 /* add more types as needed */
 455         default:
 456                 printk(IBM_ERR "acpi_evalf() called "
 457                        "with invalid format character '%c'\n", res_type);
 458                 return 0;
 459         }
 460
 461         if (!success && !quiet)
 462                 printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
 463                        method, fmt0, status);
 464
 465         return success;
 466 }
 467
 468 static void __unused acpi_print_int(acpi_handle handle, char *method)
 469 {
 470         int i;
 471
 472         if (acpi_evalf(handle, &i, method, "d"))
 473                 printk(IBM_INFO "%s = 0x%x\n", method, i);
 474         else
 475                 printk(IBM_ERR "error calling %s\n", method);
 476 }
 477
 478 static char *next_cmd(char **cmds)
 479 {
 480         char *start = *cmds;
 481         char *end;
 482
 483         while ((end = strchr(start, ',')) && end == start)
 484                 start = end + 1;
 485
 486         if (!end)
 487                 return NULL;
 488
 489         *end = 0;
 490         *cmds = end + 1;
 491         return start;
 492 }
 493
 494 static int ibm_acpi_driver_init(void)
 495 {
 496         printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
 497         printk(IBM_INFO "%s\n", IBM_URL);
 498
 499         if (ibm_thinkpad_ec_found)
 500                 printk(IBM_INFO "ThinkPad EC firmware %s\n",
 501                        ibm_thinkpad_ec_found);
 502
 503         return 0;
 504 }
 505
 506 static int driver_read(char *p)
 507 {
 508         int len = 0;
 509
 510         len += sprintf(p + len, "driver:\t\t%s\n", IBM_DESC);
 511         len += sprintf(p + len, "version:\t%s\n", IBM_VERSION);
 512
 513         return len;
 514 }
 515
 516 static int hotkey_supported;
 517 static int hotkey_mask_supported;
 518 static int hotkey_orig_status;
 519 static int hotkey_orig_mask;
 520
 521 static int hotkey_get(int *status, int *mask)
 522 {
 523         if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
 524                 return 0;
 525
 526         if (hotkey_mask_supported)
 527                 if (!acpi_evalf(hkey_handle, mask, "DHKN", "d"))
 528                         return 0;
 529
 530         return 1;
 531 }
 532
 533 static int hotkey_set(int status, int mask)
 534 {
 535         int i;
 536
 537         if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
 538                 return 0;
 539
 540         if (hotkey_mask_supported)
 541                 for (i = 0; i < 32; i++) {
 542                         int bit = ((1 << i) & mask) != 0;
 543                         if (!acpi_evalf(hkey_handle,
 544                                         NULL, "MHKM", "vdd", i + 1, bit))
 545                                 return 0;
 546                 }
 547
 548         return 1;
 549 }
 550
 551 static int hotkey_init(void)
 552 {
 553         /* hotkey not supported on 570 */
 554         hotkey_supported = hkey_handle != NULL;
 555
 556         if (hotkey_supported) {
 557                 /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
 558                    A30, R30, R31, T20-22, X20-21, X22-24 */
 559                 hotkey_mask_supported =
 560                     acpi_evalf(hkey_handle, NULL, "DHKN", "qv");
 561
 562                 if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
 563                         return -ENODEV;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int hotkey_read(char *p)
 570 {
 571         int status, mask;
 572         int len = 0;
 573
 574         if (!hotkey_supported) {
 575                 len += sprintf(p + len, "status:\t\tnot supported\n");
 576                 return len;
 577         }
 578
 579         if (!hotkey_get(&status, &mask))
 580                 return -EIO;
 581
 582         len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
 583         if (hotkey_mask_supported) {
 584                 len += sprintf(p + len, "mask:\t\t0x%04x\n", mask);
 585                 len += sprintf(p + len,
 586                                "commands:\tenable, disable, reset, <mask>\n");
 587         } else {
 588                 len += sprintf(p + len, "mask:\t\tnot supported\n");
 589                 len += sprintf(p + len, "commands:\tenable, disable, reset\n");
 590         }
 591
 592         return len;
 593 }
 594
 595 static int hotkey_write(char *buf)
 596 {
 597         int status, mask;
 598         char *cmd;
 599         int do_cmd = 0;
 600
 601         if (!hotkey_supported)
 602                 return -ENODEV;
 603
 604         if (!hotkey_get(&status, &mask))
 605                 return -EIO;
 606
 607         while ((cmd = next_cmd(&buf))) {
 608                 if (strlencmp(cmd, "enable") == 0) {
 609                         status = 1;
 610                 } else if (strlencmp(cmd, "disable") == 0) {
 611                         status = 0;
 612                 } else if (strlencmp(cmd, "reset") == 0) {
 613                         status = hotkey_orig_status;
 614                         mask = hotkey_orig_mask;
 615                 } else if (sscanf(cmd, "0x%x", &mask) == 1) {
 616                         /* mask set */
 617                 } else if (sscanf(cmd, "%x", &mask) == 1) {
 618                         /* mask set */
 619                 } else
 620                         return -EINVAL;
 621                 do_cmd = 1;
 622         }
 623
 624         if (do_cmd && !hotkey_set(status, mask))
 625                 return -EIO;
 626
 627         return 0;
 628 }
 629
 630 static void hotkey_exit(void)
 631 {
 632         if (hotkey_supported)
 633                 hotkey_set(hotkey_orig_status, hotkey_orig_mask);
 634 }
 635
 636 static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 637 {
 638         int hkey;
 639
 640         if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
 641                 acpi_bus_generate_event(ibm->device, event, hkey);
 642         else {
 643                 printk(IBM_ERR "unknown hotkey event %d\n", event);
 644                 acpi_bus_generate_event(ibm->device, event, 0);
 645         }
 646 }
 647
 648 static int bluetooth_supported;
 649
 650 static int bluetooth_init(void)
 651 {
 652         /* bluetooth not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
 653            G4x, R30, R31, R40e, R50e, T20-22, X20-21 */
 654         bluetooth_supported = hkey_handle &&
 655             acpi_evalf(hkey_handle, NULL, "GBDC", "qv");
 656
 657         return 0;
 658 }
 659
 660 static int bluetooth_status(void)
 661 {
 662         int status;
 663
 664         if (!bluetooth_supported ||
 665             !acpi_evalf(hkey_handle, &status, "GBDC", "d"))
 666                 status = 0;
 667
 668         return status;
 669 }
 670
 671 static int bluetooth_read(char *p)
 672 {
 673         int len = 0;
 674         int status = bluetooth_status();
 675
 676         if (!bluetooth_supported)
 677                 len += sprintf(p + len, "status:\t\tnot supported\n");
 678         else if (!(status & 1))
 679                 len += sprintf(p + len, "status:\t\tnot installed\n");
 680         else {
 681                 len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
 682                 len += sprintf(p + len, "commands:\tenable, disable\n");
 683         }
 684
 685         return len;
 686 }
 687
 688 static int bluetooth_write(char *buf)
 689 {
 690         int status = bluetooth_status();
 691         char *cmd;
 692         int do_cmd = 0;
 693
 694         if (!bluetooth_supported)
 695                 return -ENODEV;
 696
 697         while ((cmd = next_cmd(&buf))) {
 698                 if (strlencmp(cmd, "enable") == 0) {
 699                         status |= 2;
 700                 } else if (strlencmp(cmd, "disable") == 0) {
 701                         status &= ~2;
 702                 } else
 703                         return -EINVAL;
 704                 do_cmd = 1;
 705         }
 706
 707         if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
 708                 return -EIO;
 709
 710         return 0;
 711 }
 712
 713 static int wan_supported;
 714
 715 static int wan_init(void)
 716 {
 717         wan_supported = hkey_handle &&
 718             acpi_evalf(hkey_handle, NULL, "GWAN", "qv");
 719
 720         return 0;
 721 }
 722
 723 static int wan_status(void)
 724 {
 725         int status;
 726
 727         if (!wan_supported || !acpi_evalf(hkey_handle, &status, "GWAN", "d"))
 728                 status = 0;
 729
 730         return status;
 731 }
 732
 733 static int wan_read(char *p)
 734 {
 735         int len = 0;
 736         int status = wan_status();
 737
 738         if (!wan_supported)
 739                 len += sprintf(p + len, "status:\t\tnot supported\n");
 740         else if (!(status & 1))
 741                 len += sprintf(p + len, "status:\t\tnot installed\n");
 742         else {
 743                 len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
 744                 len += sprintf(p + len, "commands:\tenable, disable\n");
 745         }
 746
 747         return len;
 748 }
 749
 750 static int wan_write(char *buf)
 751 {
 752         int status = wan_status();
 753         char *cmd;
 754         int do_cmd = 0;
 755
 756         if (!wan_supported)
 757                 return -ENODEV;
 758
 759         while ((cmd = next_cmd(&buf))) {
 760                 if (strlencmp(cmd, "enable") == 0) {
 761                         status |= 2;
 762                 } else if (strlencmp(cmd, "disable") == 0) {
 763                         status &= ~2;
 764                 } else
 765                         return -EINVAL;
 766                 do_cmd = 1;
 767         }
 768
 769         if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SWAN", "vd", status))
 770                 return -EIO;
 771
 772         return 0;
 773 }
 774
 775 enum video_access_mode {
 776         IBMACPI_VIDEO_NONE = 0,
 777         IBMACPI_VIDEO_570,      /* 570 */
 778         IBMACPI_VIDEO_770,      /* 600e/x, 770e, 770x */
 779         IBMACPI_VIDEO_NEW,      /* all others */
 780 };
 781
 782 static enum video_access_mode video_supported;
 783 static int video_orig_autosw;
 784
 785 static int video_init(void)
 786 {
 787         int ivga;
 788
 789         if (vid2_handle && acpi_evalf(NULL, &ivga, "\\IVGA", "d") && ivga)
 790                 /* G41, assume IVGA doesn't change */
 791                 vid_handle = vid2_handle;
 792
 793         if (!vid_handle)
 794                 /* video switching not supported on R30, R31 */
 795                 video_supported = IBMACPI_VIDEO_NONE;
 796         else if (acpi_evalf(vid_handle, &video_orig_autosw, "SWIT", "qd"))
 797                 /* 570 */
 798                 video_supported = IBMACPI_VIDEO_570;
 799         else if (acpi_evalf(vid_handle, &video_orig_autosw, "^VADL", "qd"))
 800                 /* 600e/x, 770e, 770x */
 801                 video_supported = IBMACPI_VIDEO_770;
 802         else
 803                 /* all others */
 804                 video_supported = IBMACPI_VIDEO_NEW;
 805
 806         return 0;
 807 }
 808
 809 static int video_status(void)
 810 {
 811         int status = 0;
 812         int i;
 813
 814         if (video_supported == IBMACPI_VIDEO_570) {
 815                 if (acpi_evalf(NULL, &i, "\\_SB.PHS", "dd", 0x87))
 816                         status = i & 3;
 817         } else if (video_supported == IBMACPI_VIDEO_770) {
 818                 if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
 819                         status |= 0x01 * i;
 820                 if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
 821                         status |= 0x02 * i;
 822         } else if (video_supported == IBMACPI_VIDEO_NEW) {
 823                 acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1);
 824                 if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
 825                         status |= 0x02 * i;
 826
 827                 acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0);
 828                 if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
 829                         status |= 0x01 * i;
 830                 if (acpi_evalf(NULL, &i, "\\VCDD", "d"))
 831                         status |= 0x08 * i;
 832         }
 833
 834         return status;
 835 }
 836
 837 static int video_autosw(void)
 838 {
 839         int autosw = 0;
 840
 841         if (video_supported == IBMACPI_VIDEO_570)
 842                 acpi_evalf(vid_handle, &autosw, "SWIT", "d");
 843         else if (video_supported == IBMACPI_VIDEO_770 ||
 844                  video_supported == IBMACPI_VIDEO_NEW)
 845                 acpi_evalf(vid_handle, &autosw, "^VDEE", "d");
 846
 847         return autosw & 1;
 848 }
 849
 850 static int video_read(char *p)
 851 {
 852         int status = video_status();
 853         int autosw = video_autosw();
 854         int len = 0;
 855
 856         if (!video_supported) {
 857                 len += sprintf(p + len, "status:\t\tnot supported\n");
 858                 return len;
 859         }
 860
 861         len += sprintf(p + len, "status:\t\tsupported\n");
 862         len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
 863         len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
 864         if (video_supported == IBMACPI_VIDEO_NEW)
 865                 len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
 866         len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
 867         len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
 868         len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
 869         if (video_supported == IBMACPI_VIDEO_NEW)
 870                 len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
 871         len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
 872         len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
 873
 874         return len;
 875 }
 876
 877 static int video_switch(void)
 878 {
 879         int autosw = video_autosw();
 880         int ret;
 881
 882         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 883                 return -EIO;
 884         ret = video_supported == IBMACPI_VIDEO_570 ?
 885             acpi_evalf(ec_handle, NULL, "_Q16", "v") :
 886             acpi_evalf(vid_handle, NULL, "VSWT", "v");
 887         acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);
 888
 889         return ret;
 890 }
 891
 892 static int video_expand(void)
 893 {
 894         if (video_supported == IBMACPI_VIDEO_570)
 895                 return acpi_evalf(ec_handle, NULL, "_Q17", "v");
 896         else if (video_supported == IBMACPI_VIDEO_770)
 897                 return acpi_evalf(vid_handle, NULL, "VEXP", "v");
 898         else
 899                 return acpi_evalf(NULL, NULL, "\\VEXP", "v");
 900 }
 901
 902 static int video_switch2(int status)
 903 {
 904         int ret;
 905
 906         if (video_supported == IBMACPI_VIDEO_570) {
 907                 ret = acpi_evalf(NULL, NULL,
 908                                  "\\_SB.PHS2", "vdd", 0x8b, status | 0x80);
 909         } else if (video_supported == IBMACPI_VIDEO_770) {
 910                 int autosw = video_autosw();
 911                 if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 912                         return -EIO;
 913
 914                 ret = acpi_evalf(vid_handle, NULL,
 915                                  "ASWT", "vdd", status * 0x100, 0);
 916
 917                 acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);
 918         } else {
 919                 ret = acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80) &&
 920                     acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1);
 921         }
 922
 923         return ret;
 924 }
 925
 926 static int video_write(char *buf)
 927 {
 928         char *cmd;
 929         int enable, disable, status;
 930
 931         if (!video_supported)
 932                 return -ENODEV;
 933
 934         enable = disable = 0;
 935
 936         while ((cmd = next_cmd(&buf))) {
 937                 if (strlencmp(cmd, "lcd_enable") == 0) {
 938                         enable |= 0x01;
 939                 } else if (strlencmp(cmd, "lcd_disable") == 0) {
 940                         disable |= 0x01;
 941                 } else if (strlencmp(cmd, "crt_enable") == 0) {
 942                         enable |= 0x02;
 943                 } else if (strlencmp(cmd, "crt_disable") == 0) {
 944                         disable |= 0x02;
 945                 } else if (video_supported == IBMACPI_VIDEO_NEW &&
 946                            strlencmp(cmd, "dvi_enable") == 0) {
 947                         enable |= 0x08;
 948                 } else if (video_supported == IBMACPI_VIDEO_NEW &&
 949                            strlencmp(cmd, "dvi_disable") == 0) {
 950                         disable |= 0x08;
 951                 } else if (strlencmp(cmd, "auto_enable") == 0) {
 952                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 953                                 return -EIO;
 954                 } else if (strlencmp(cmd, "auto_disable") == 0) {
 955                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 0))
 956                                 return -EIO;
 957                 } else if (strlencmp(cmd, "video_switch") == 0) {
 958                         if (!video_switch())
 959                                 return -EIO;
 960                 } else if (strlencmp(cmd, "expand_toggle") == 0) {
 961                         if (!video_expand())
 962                                 return -EIO;
 963                 } else
 964                         return -EINVAL;
 965         }
 966
 967         if (enable || disable) {
 968                 status = (video_status() & 0x0f & ~disable) | enable;
 969                 if (!video_switch2(status))
 970                         return -EIO;
 971         }
 972
 973         return 0;
 974 }
 975
 976 static void video_exit(void)
 977 {
 978         acpi_evalf(vid_handle, NULL, "_DOS", "vd", video_orig_autosw);
 979 }
 980
 981 static int light_supported;
 982 static int light_status_supported;
 983
 984 static int light_init(void)
 985 {
 986         /* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
 987         light_supported = (cmos_handle || lght_handle) && !ledb_handle;
 988
 989         if (light_supported)
 990                 /* light status not supported on
 991                    570, 600e/x, 770e, 770x, G4x, R30, R31, R32, X20 */
 992                 light_status_supported = acpi_evalf(ec_handle, NULL,
 993                                                     "KBLT", "qv");
 994
 995         return 0;
 996 }
 997
 998 static int light_read(char *p)
 999 {
1000         int len = 0;
1001         int status = 0;
1002
1003         if (!light_supported) {
1004                 len += sprintf(p + len, "status:\t\tnot supported\n");
1005         } else if (!light_status_supported) {
1006                 len += sprintf(p + len, "status:\t\tunknown\n");
1007                 len += sprintf(p + len, "commands:\ton, off\n");
1008         } else {
1009                 if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
1010                         return -EIO;
1011                 len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
1012                 len += sprintf(p + len, "commands:\ton, off\n");
1013         }
1014
1015         return len;
1016 }
1017
1018 static int light_write(char *buf)
1019 {
1020         int cmos_cmd, lght_cmd;
1021         char *cmd;
1022         int success;
1023
1024         if (!light_supported)
1025                 return -ENODEV;
1026
1027         while ((cmd = next_cmd(&buf))) {
1028                 if (strlencmp(cmd, "on") == 0) {
1029                         cmos_cmd = 0x0c;
1030                         lght_cmd = 1;
1031                 } else if (strlencmp(cmd, "off") == 0) {
1032                         cmos_cmd = 0x0d;
1033                         lght_cmd = 0;
1034                 } else
1035                         return -EINVAL;
1036
1037                 success = cmos_handle ?
1038                     acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd) :
1039                     acpi_evalf(lght_handle, NULL, NULL, "vd", lght_cmd);
1040                 if (!success)
1041                         return -EIO;
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int _sta(acpi_handle handle)
1048 {
1049         int status;
1050
1051         if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
1052                 status = 0;
1053
1054         return status;
1055 }
1056
1057 #ifdef CONFIG_ACPI_IBM_DOCK
1058 #define dock_docked() (_sta(dock_handle) & 1)
1059
1060 static int dock_read(char *p)
1061 {
1062         int len = 0;
1063         int docked = dock_docked();
1064
1065         if (!dock_handle)
1066                 len += sprintf(p + len, "status:\t\tnot supported\n");
1067         else if (!docked)
1068                 len += sprintf(p + len, "status:\t\tundocked\n");
1069         else {
1070                 len += sprintf(p + len, "status:\t\tdocked\n");
1071                 len += sprintf(p + len, "commands:\tdock, undock\n");
1072         }
1073
1074         return len;
1075 }
1076
1077 static int dock_write(char *buf)
1078 {
1079         char *cmd;
1080
1081         if (!dock_docked())
1082                 return -ENODEV;
1083
1084         while ((cmd = next_cmd(&buf))) {
1085                 if (strlencmp(cmd, "undock") == 0) {
1086                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0) ||
1087                             !acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
1088                                 return -EIO;
1089                 } else if (strlencmp(cmd, "dock") == 0) {
1090                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
1091                                 return -EIO;
1092                 } else
1093                         return -EINVAL;
1094         }
1095
1096         return 0;
1097 }
1098
1099 static void dock_notify(struct ibm_struct *ibm, u32 event)
1100 {
1101         int docked = dock_docked();
1102         int pci = ibm->hid && strstr(ibm->hid, IBM_PCI_HID);
1103
1104         if (event == 1 && !pci) /* 570 */
1105                 acpi_bus_generate_event(ibm->device, event, 1); /* button */
1106         else if (event == 1 && pci)     /* 570 */
1107                 acpi_bus_generate_event(ibm->device, event, 3); /* dock */
1108         else if (event == 3 && docked)
1109                 acpi_bus_generate_event(ibm->device, event, 1); /* button */
1110         else if (event == 3 && !docked)
1111                 acpi_bus_generate_event(ibm->device, event, 2); /* undock */
1112         else if (event == 0 && docked)
1113                 acpi_bus_generate_event(ibm->device, event, 3); /* dock */
1114         else {
1115                 printk(IBM_ERR "unknown dock event %d, status %d\n",
1116                        event, _sta(dock_handle));
1117                 acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
1118         }
1119 }
1120 #endif
1121
1122 static int bay_status_supported;
1123 static int bay_status2_supported;
1124 static int bay_eject_supported;
1125 static int bay_eject2_supported;
1126
1127 static int bay_init(void)
1128 {
1129         bay_status_supported = bay_handle &&
1130             acpi_evalf(bay_handle, NULL, "_STA", "qv");
1131         bay_status2_supported = bay2_handle &&
1132             acpi_evalf(bay2_handle, NULL, "_STA", "qv");
1133
1134         bay_eject_supported = bay_handle && bay_ej_handle &&
1135             (strlencmp(bay_ej_path, "_EJ0") == 0 || experimental);
1136         bay_eject2_supported = bay2_handle && bay2_ej_handle &&
1137             (strlencmp(bay2_ej_path, "_EJ0") == 0 || experimental);
1138
1139         return 0;
1140 }
1141
1142 #define bay_occupied(b) (_sta(b##_handle) & 1)
1143
1144 static int bay_read(char *p)
1145 {
1146         int len = 0;
1147         int occupied = bay_occupied(bay);
1148         int occupied2 = bay_occupied(bay2);
1149         int eject, eject2;
1150
1151         len += sprintf(p + len, "status:\t\t%s\n", bay_status_supported ?
1152                        (occupied ? "occupied" : "unoccupied") :
1153                        "not supported");
1154         if (bay_status2_supported)
1155                 len += sprintf(p + len, "status2:\t%s\n", occupied2 ?
1156                                "occupied" : "unoccupied");
1157
1158         eject = bay_eject_supported && occupied;
1159         eject2 = bay_eject2_supported && occupied2;
1160
1161         if (eject && eject2)
1162                 len += sprintf(p + len, "commands:\teject, eject2\n");
1163         else if (eject)
1164                 len += sprintf(p + len, "commands:\teject\n");
1165         else if (eject2)
1166                 len += sprintf(p + len, "commands:\teject2\n");
1167
1168         return len;
1169 }
1170
1171 static int bay_write(char *buf)
1172 {
1173         char *cmd;
1174
1175         if (!bay_eject_supported && !bay_eject2_supported)
1176                 return -ENODEV;
1177
1178         while ((cmd = next_cmd(&buf))) {
1179                 if (bay_eject_supported && strlencmp(cmd, "eject") == 0) {
1180                         if (!acpi_evalf(bay_ej_handle, NULL, NULL, "vd", 1))
1181                                 return -EIO;
1182                 } else if (bay_eject2_supported &&
1183                            strlencmp(cmd, "eject2") == 0) {
1184                         if (!acpi_evalf(bay2_ej_handle, NULL, NULL, "vd", 1))
1185                                 return -EIO;
1186                 } else
1187                         return -EINVAL;
1188         }
1189
1190         return 0;
1191 }
1192
1193 static void bay_notify(struct ibm_struct *ibm, u32 event)
1194 {
1195         acpi_bus_generate_event(ibm->device, event, 0);
1196 }
1197
1198 static int cmos_read(char *p)
1199 {
1200         int len = 0;
1201
1202         /* cmos not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
1203            R30, R31, T20-22, X20-21 */
1204         if (!cmos_handle)
1205                 len += sprintf(p + len, "status:\t\tnot supported\n");
1206         else {
1207                 len += sprintf(p + len, "status:\t\tsupported\n");
1208                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-21)\n");
1209         }
1210
1211         return len;
1212 }
1213
1214 static int cmos_eval(int cmos_cmd)
1215 {
1216         if (cmos_handle)
1217                 return acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd);
1218         else
1219                 return 1;
1220 }
1221
1222 static int cmos_write(char *buf)
1223 {
1224         char *cmd;
1225         int cmos_cmd;
1226
1227         if (!cmos_handle)
1228                 return -EINVAL;
1229
1230         while ((cmd = next_cmd(&buf))) {
1231                 if (sscanf(cmd, "%u", &cmos_cmd) == 1 &&
1232                     cmos_cmd >= 0 && cmos_cmd <= 21) {
1233                         /* cmos_cmd set */
1234                 } else
1235                         return -EINVAL;
1236
1237                 if (!cmos_eval(cmos_cmd))
1238                         return -EIO;
1239         }
1240
1241         return 0;
1242 }
1243
1244 enum led_access_mode {
1245         IBMACPI_LED_NONE = 0,
1246         IBMACPI_LED_570,        /* 570 */
1247         IBMACPI_LED_OLD,        /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
1248         IBMACPI_LED_NEW,        /* all others */
1249 };
1250 static enum led_access_mode led_supported;
1251
1252 static int led_init(void)
1253 {
1254         if (!led_handle)
1255                 /* led not supported on R30, R31 */
1256                 led_supported = IBMACPI_LED_NONE;
1257         else if (strlencmp(led_path, "SLED") == 0)
1258                 /* 570 */
1259                 led_supported = IBMACPI_LED_570;
1260         else if (strlencmp(led_path, "SYSL") == 0)
1261                 /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
1262                 led_supported = IBMACPI_LED_OLD;
1263         else
1264                 /* all others */
1265                 led_supported = IBMACPI_LED_NEW;
1266
1267         return 0;
1268 }
1269
1270 #define led_status(s) ((s) == 0 ? "off" : ((s) == 1 ? "on" : "blinking"))
1271
1272 static int led_read(char *p)
1273 {
1274         int len = 0;
1275
1276         if (!led_supported) {
1277                 len += sprintf(p + len, "status:\t\tnot supported\n");
1278                 return len;
1279         }
1280         len += sprintf(p + len, "status:\t\tsupported\n");
1281
1282         if (led_supported == IBMACPI_LED_570) {
1283                 /* 570 */
1284                 int i, status;
1285                 for (i = 0; i < 8; i++) {
1286                         if (!acpi_evalf(ec_handle,
1287                                         &status, "GLED", "dd", 1 << i))
1288                                 return -EIO;
1289                         len += sprintf(p + len, "%d:\t\t%s\n",
1290                                        i, led_status(status));
1291                 }
1292         }
1293
1294         len += sprintf(p + len, "commands:\t"
1295                        "<led> on, <led> off, <led> blink (<led> is 0-7)\n");
1296
1297         return len;
1298 }
1299
1300 /* off, on, blink */
1301 static const int led_sled_arg1[] = { 0, 1, 3 };
1302 static const int led_exp_hlbl[] = { 0, 0, 1 };  /* led# * */
1303 static const int led_exp_hlcl[] = { 0, 1, 1 };  /* led# * */
1304 static const int led_led_arg1[] = { 0, 0x80, 0xc0 };
1305
1306 #define EC_HLCL 0x0c
1307 #define EC_HLBL 0x0d
1308 #define EC_HLMS 0x0e
1309
1310 static int led_write(char *buf)
1311 {
1312         char *cmd;
1313         int led, ind, ret;
1314
1315         if (!led_supported)
1316                 return -ENODEV;
1317
1318         while ((cmd = next_cmd(&buf))) {
1319                 if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 7)
1320                         return -EINVAL;
1321
1322                 if (strstr(cmd, "off")) {
1323                         ind = 0;
1324                 } else if (strstr(cmd, "on")) {
1325                         ind = 1;
1326                 } else if (strstr(cmd, "blink")) {
1327                         ind = 2;
1328                 } else
1329                         return -EINVAL;
1330
1331                 if (led_supported == IBMACPI_LED_570) {
1332                         /* 570 */
1333                         led = 1 << led;
1334                         if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
1335                                         led, led_sled_arg1[ind]))
1336                                 return -EIO;
1337                 } else if (led_supported == IBMACPI_LED_OLD) {
1338                         /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
1339                         led = 1 << led;
1340                         ret = ec_write(EC_HLMS, led);
1341                         if (ret >= 0)
1342                                 ret =
1343                                     ec_write(EC_HLBL, led * led_exp_hlbl[ind]);
1344                         if (ret >= 0)
1345                                 ret =
1346                                     ec_write(EC_HLCL, led * led_exp_hlcl[ind]);
1347                         if (ret < 0)
1348                                 return ret;
1349                 } else {
1350                         /* all others */
1351                         if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
1352                                         led, led_led_arg1[ind]))
1353                                 return -EIO;
1354                 }
1355         }
1356
1357         return 0;
1358 }
1359
1360 static int beep_read(char *p)
1361 {
1362         int len = 0;
1363
1364         if (!beep_handle)
1365                 len += sprintf(p + len, "status:\t\tnot supported\n");
1366         else {
1367                 len += sprintf(p + len, "status:\t\tsupported\n");
1368                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-17)\n");
1369         }
1370
1371         return len;
1372 }
1373
1374 static int beep_write(char *buf)
1375 {
1376         char *cmd;
1377         int beep_cmd;
1378
1379         if (!beep_handle)
1380                 return -ENODEV;
1381
1382         while ((cmd = next_cmd(&buf))) {
1383                 if (sscanf(cmd, "%u", &beep_cmd) == 1 &&
1384                     beep_cmd >= 0 && beep_cmd <= 17) {
1385                         /* beep_cmd set */
1386                 } else
1387                         return -EINVAL;
1388                 if (!acpi_evalf(beep_handle, NULL, NULL, "vdd", beep_cmd, 0))
1389                         return -EIO;
1390         }
1391
1392         return 0;
1393 }
1394
1395 static int acpi_ec_read(int i, u8 * p)
1396 {
1397         int v;
1398
1399         if (ecrd_handle) {
1400                 if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
1401                         return 0;
1402                 *p = v;
1403         } else {
1404                 if (ec_read(i, p) < 0)
1405                         return 0;
1406         }
1407
1408         return 1;
1409 }
1410
1411 static int acpi_ec_write(int i, u8 v)
1412 {
1413         if (ecwr_handle) {
1414                 if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
1415                         return 0;
1416         } else {
1417                 if (ec_write(i, v) < 0)
1418                         return 0;
1419         }
1420
1421         return 1;
1422 }
1423
1424 static enum thermal_access_mode thermal_read_mode;
1425
1426 static int thermal_init(void)
1427 {
1428         u8 t, ta1, ta2;
1429         int i;
1430         int acpi_tmp7 = acpi_evalf(ec_handle, NULL, "TMP7", "qv");
1431
1432         if (ibm_thinkpad_ec_found && experimental) {
1433                 /*
1434                  * Direct EC access mode: sensors at registers
1435                  * 0x78-0x7F, 0xC0-0xC7.  Registers return 0x00 for
1436                  * non-implemented, thermal sensors return 0x80 when
1437                  * not available
1438                  */
1439
1440                 ta1 = ta2 = 0;
1441                 for (i = 0; i < 8; i++) {
1442                         if (likely(acpi_ec_read(0x78 + i, &t))) {
1443                                 ta1 |= t;
1444                         } else {
1445                                 ta1 = 0;
1446                                 break;
1447                         }
1448                         if (likely(acpi_ec_read(0xC0 + i, &t))) {
1449                                 ta2 |= t;
1450                         } else {
1451                                 ta1 = 0;
1452                                 break;
1453                         }
1454                 }
1455                 if (ta1 == 0) {
1456                         /* This is sheer paranoia, but we handle it anyway */
1457                         if (acpi_tmp7) {
1458                                 printk(IBM_ERR
1459                                        "ThinkPad ACPI EC access misbehaving, "
1460                                        "falling back to ACPI TMPx access mode\n");
1461                                 thermal_read_mode = IBMACPI_THERMAL_ACPI_TMP07;
1462                         } else {
1463                                 printk(IBM_ERR
1464                                        "ThinkPad ACPI EC access misbehaving, "
1465                                        "disabling thermal sensors access\n");
1466                                 thermal_read_mode = IBMACPI_THERMAL_NONE;
1467                         }
1468                 } else {
1469                         thermal_read_mode =
1470                             (ta2 != 0) ?
1471                             IBMACPI_THERMAL_TPEC_16 : IBMACPI_THERMAL_TPEC_8;
1472                 }
1473         } else if (acpi_tmp7) {
1474                 if (acpi_evalf(ec_handle, NULL, "UPDT", "qv")) {
1475                         /* 600e/x, 770e, 770x */
1476                         thermal_read_mode = IBMACPI_THERMAL_ACPI_UPDT;
1477                 } else {
1478                         /* Standard ACPI TMPx access, max 8 sensors */
1479                         thermal_read_mode = IBMACPI_THERMAL_ACPI_TMP07;
1480                 }
1481         } else {
1482                 /* temperatures not supported on 570, G4x, R30, R31, R32 */
1483                 thermal_read_mode = IBMACPI_THERMAL_NONE;
1484         }
1485
1486         return 0;
1487 }
1488
1489 static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)
1490 {
1491         int i, t;
1492         s8 tmp;
1493         char tmpi[] = "TMPi";
1494
1495         if (!s)
1496                 return -EINVAL;
1497
1498         switch (thermal_read_mode) {
1499 #if IBMACPI_MAX_THERMAL_SENSORS >= 16
1500         case IBMACPI_THERMAL_TPEC_16:
1501                 for (i = 0; i < 8; i++) {
1502                         if (!acpi_ec_read(0xC0 + i, &tmp))
1503                                 return -EIO;
1504                         s->temp[i + 8] = tmp * 1000;
1505                 }
1506                 /* fallthrough */
1507 #endif
1508         case IBMACPI_THERMAL_TPEC_8:
1509                 for (i = 0; i < 8; i++) {
1510                         if (!acpi_ec_read(0x78 + i, &tmp))
1511                                 return -EIO;
1512                         s->temp[i] = tmp * 1000;
1513                 }
1514                 return (thermal_read_mode == IBMACPI_THERMAL_TPEC_16) ? 16 : 8;
1515
1516         case IBMACPI_THERMAL_ACPI_UPDT:
1517                 if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
1518                         return -EIO;
1519                 for (i = 0; i < 8; i++) {
1520                         tmpi[3] = '0' + i;
1521                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
1522                                 return -EIO;
1523                         s->temp[i] = (t - 2732) * 100;
1524                 }
1525                 return 8;
1526
1527         case IBMACPI_THERMAL_ACPI_TMP07:
1528                 for (i = 0; i < 8; i++) {
1529                         tmpi[3] = '0' + i;
1530                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
1531                                 return -EIO;
1532                         s->temp[i] = t * 1000;
1533                 }
1534                 return 8;
1535
1536         case IBMACPI_THERMAL_NONE:
1537         default:
1538                 return 0;
1539         }
1540 }
1541
1542 static int thermal_read(char *p)
1543 {
1544         int len = 0;
1545         int n, i;
1546         struct ibm_thermal_sensors_struct t;
1547
1548         n = thermal_get_sensors(&t);
1549         if (unlikely(n < 0))
1550                 return n;
1551
1552         len += sprintf(p + len, "temperatures:\t");
1553
1554         if (n > 0) {
1555                 for (i = 0; i < (n - 1); i++)
1556                         len += sprintf(p + len, "%d ", t.temp[i] / 1000);
1557                 len += sprintf(p + len, "%d\n", t.temp[i] / 1000);
1558         } else
1559                 len += sprintf(p + len, "not supported\n");
1560
1561         return len;
1562 }
1563
1564 static u8 ecdump_regs[256];
1565
1566 static int ecdump_read(char *p)
1567 {
1568         int len = 0;
1569         int i, j;
1570         u8 v;
1571
1572         len += sprintf(p + len, "EC      "
1573                        " +00 +01 +02 +03 +04 +05 +06 +07"
1574                        " +08 +09 +0a +0b +0c +0d +0e +0f\n");
1575         for (i = 0; i < 256; i += 16) {
1576                 len += sprintf(p + len, "EC 0x%02x:", i);
1577                 for (j = 0; j < 16; j++) {
1578                         if (!acpi_ec_read(i + j, &v))
1579                                 break;
1580                         if (v != ecdump_regs[i + j])
1581                                 len += sprintf(p + len, " *%02x", v);
1582                         else
1583                                 len += sprintf(p + len, "  %02x", v);
1584                         ecdump_regs[i + j] = v;
1585                 }
1586                 len += sprintf(p + len, "\n");
1587                 if (j != 16)
1588                         break;
1589         }
1590
1591         /* These are way too dangerous to advertise openly... */
1592 #if 0
1593         len += sprintf(p + len, "commands:\t0x<offset> 0x<value>"
1594                        " (<offset> is 00-ff, <value> is 00-ff)\n");
1595         len += sprintf(p + len, "commands:\t0x<offset> <value>  "
1596                        " (<offset> is 00-ff, <value> is 0-255)\n");
1597 #endif
1598         return len;
1599 }
1600
1601 static int ecdump_write(char *buf)
1602 {
1603         char *cmd;
1604         int i, v;
1605
1606         while ((cmd = next_cmd(&buf))) {
1607                 if (sscanf(cmd, "0x%x 0x%x", &i, &v) == 2) {
1608                         /* i and v set */
1609                 } else if (sscanf(cmd, "0x%x %u", &i, &v) == 2) {
1610                         /* i and v set */
1611                 } else
1612                         return -EINVAL;
1613                 if (i >= 0 && i < 256 && v >= 0 && v < 256) {
1614                         if (!acpi_ec_write(i, v))
1615                                 return -EIO;
1616                 } else
1617                         return -EINVAL;
1618         }
1619
1620         return 0;
1621 }
1622
1623 static int brightness_offset = 0x31;
1624
1625 static int brightness_get(struct backlight_device *bd)
1626 {
1627         u8 level;
1628         if (!acpi_ec_read(brightness_offset, &level))
1629                 return -EIO;
1630
1631         level &= 0x7;
1632
1633         return level;
1634 }
1635
1636 static int brightness_read(char *p)
1637 {
1638         int len = 0;
1639         int level;
1640
1641         if ((level = brightness_get(NULL)) < 0) {
1642                 len += sprintf(p + len, "level:\t\tunreadable\n");
1643         } else {
1644                 len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
1645                 len += sprintf(p + len, "commands:\tup, down\n");
1646                 len += sprintf(p + len, "commands:\tlevel <level>"
1647                                " (<level> is 0-7)\n");
1648         }
1649
1650         return len;
1651 }
1652
1653 #define BRIGHTNESS_UP   4
1654 #define BRIGHTNESS_DOWN 5
1655
1656 static int brightness_set(int value)
1657 {
1658         int cmos_cmd, inc, i;
1659         int current_value = brightness_get(NULL);
1660
1661         value &= 7;
1662
1663         cmos_cmd = value > current_value ? BRIGHTNESS_UP : BRIGHTNESS_DOWN;
1664         inc = value > current_value ? 1 : -1;
1665         for (i = current_value; i != value; i += inc) {
1666                 if (!cmos_eval(cmos_cmd))
1667                         return -EIO;
1668                 if (!acpi_ec_write(brightness_offset, i + inc))
1669                         return -EIO;
1670         }
1671
1672         return 0;
1673 }
1674
1675 static int brightness_write(char *buf)
1676 {
1677         int level;
1678         int new_level;
1679         char *cmd;
1680
1681         while ((cmd = next_cmd(&buf))) {
1682                 if ((level = brightness_get(NULL)) < 0)
1683                         return level;
1684                 level &= 7;
1685
1686                 if (strlencmp(cmd, "up") == 0) {
1687                         new_level = level == 7 ? 7 : level + 1;
1688                 } else if (strlencmp(cmd, "down") == 0) {
1689                         new_level = level == 0 ? 0 : level - 1;
1690                 } else if (sscanf(cmd, "level %d", &new_level) == 1 &&
1691                            new_level >= 0 && new_level <= 7) {
1692                         /* new_level set */
1693                 } else
1694                         return -EINVAL;
1695
1696                 brightness_set(new_level);
1697         }
1698
1699         return 0;
1700 }
1701
1702 static int brightness_update_status(struct backlight_device *bd)
1703 {
1704         return brightness_set(bd->props.brightness);
1705 }
1706
1707 static struct backlight_ops ibm_backlight_data = {
1708         .get_brightness = brightness_get,
1709         .update_status  = brightness_update_status,
1710 };
1711
1712 static int brightness_init(void)
1713 {
1714         int b;
1715
1716         b = brightness_get(NULL);
1717         if (b < 0)
1718                 return b;
1719
1720         ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
1721                                                          &ibm_backlight_data);
1722         if (IS_ERR(ibm_backlight_device)) {
1723                 printk(IBM_ERR "Could not register backlight device\n");
1724                 return PTR_ERR(ibm_backlight_device);
1725         }
1726
1727         ibm_backlight_device->props.max_brightness = 7;
1728         ibm_backlight_device->props.brightness = b;
1729         backlight_update_status(ibm_backlight_device);
1730
1731         return 0;
1732 }
1733
1734 static void brightness_exit(void)
1735 {
1736         if (ibm_backlight_device) {
1737                 backlight_device_unregister(ibm_backlight_device);
1738                 ibm_backlight_device = NULL;
1739         }
1740 }
1741
1742 static int volume_offset = 0x30;
1743
1744 static int volume_read(char *p)
1745 {
1746         int len = 0;
1747         u8 level;
1748
1749         if (!acpi_ec_read(volume_offset, &level)) {
1750                 len += sprintf(p + len, "level:\t\tunreadable\n");
1751         } else {
1752                 len += sprintf(p + len, "level:\t\t%d\n", level & 0xf);
1753                 len += sprintf(p + len, "mute:\t\t%s\n", onoff(level, 6));
1754                 len += sprintf(p + len, "commands:\tup, down, mute\n");
1755                 len += sprintf(p + len, "commands:\tlevel <level>"
1756                                " (<level> is 0-15)\n");
1757         }
1758
1759         return len;
1760 }
1761
1762 #define VOLUME_DOWN     0
1763 #define VOLUME_UP       1
1764 #define VOLUME_MUTE     2
1765
1766 static int volume_write(char *buf)
1767 {
1768         int cmos_cmd, inc, i;
1769         u8 level, mute;
1770         int new_level, new_mute;
1771         char *cmd;
1772
1773         while ((cmd = next_cmd(&buf))) {
1774                 if (!acpi_ec_read(volume_offset, &level))
1775                         return -EIO;
1776                 new_mute = mute = level & 0x40;
1777                 new_level = level = level & 0xf;
1778
1779                 if (strlencmp(cmd, "up") == 0) {
1780                         if (mute)
1781                                 new_mute = 0;
1782                         else
1783                                 new_level = level == 15 ? 15 : level + 1;
1784                 } else if (strlencmp(cmd, "down") == 0) {
1785                         if (mute)
1786                                 new_mute = 0;
1787                         else
1788                                 new_level = level == 0 ? 0 : level - 1;
1789                 } else if (sscanf(cmd, "level %d", &new_level) == 1 &&
1790                            new_level >= 0 && new_level <= 15) {
1791                         /* new_level set */
1792                 } else if (strlencmp(cmd, "mute") == 0) {
1793                         new_mute = 0x40;
1794                 } else
1795                         return -EINVAL;
1796
1797                 if (new_level != level) {       /* mute doesn't change */
1798                         cmos_cmd = new_level > level ? VOLUME_UP : VOLUME_DOWN;
1799                         inc = new_level > level ? 1 : -1;
1800
1801                         if (mute && (!cmos_eval(cmos_cmd) ||
1802                                      !acpi_ec_write(volume_offset, level)))
1803                                 return -EIO;
1804
1805                         for (i = level; i != new_level; i += inc)
1806                                 if (!cmos_eval(cmos_cmd) ||
1807                                     !acpi_ec_write(volume_offset, i + inc))
1808                                         return -EIO;
1809
1810                         if (mute && (!cmos_eval(VOLUME_MUTE) ||
1811                                      !acpi_ec_write(volume_offset,
1812                                                     new_level + mute)))
1813                                 return -EIO;
1814                 }
1815
1816                 if (new_mute != mute) { /* level doesn't change */
1817                         cmos_cmd = new_mute ? VOLUME_MUTE : VOLUME_UP;
1818
1819                         if (!cmos_eval(cmos_cmd) ||
1820                             !acpi_ec_write(volume_offset, level + new_mute))
1821                                 return -EIO;
1822                 }
1823         }
1824
1825         return 0;
1826 }
1827
1828 static enum fan_status_access_mode fan_status_access_mode;
1829 static enum fan_control_access_mode fan_control_access_mode;
1830 static enum fan_control_commands fan_control_commands;
1831
1832 static int fan_control_status_known;
1833 static u8 fan_control_initial_status;
1834
1835 static void fan_watchdog_fire(struct work_struct *ignored);
1836 static int fan_watchdog_maxinterval;
1837 static DECLARE_DELAYED_WORK(fan_watchdog_task, fan_watchdog_fire);
1838
1839 static int fan_init(void)
1840 {
1841         fan_status_access_mode = IBMACPI_FAN_NONE;
1842         fan_control_access_mode = IBMACPI_FAN_WR_NONE;
1843         fan_control_commands = 0;
1844         fan_control_status_known = 1;
1845         fan_watchdog_maxinterval = 0;
1846
1847         if (gfan_handle) {
1848                 /* 570, 600e/x, 770e, 770x */
1849                 fan_status_access_mode = IBMACPI_FAN_RD_ACPI_GFAN;
1850         } else {
1851                 /* all other ThinkPads: note that even old-style
1852                  * ThinkPad ECs supports the fan control register */
1853                 if (likely(acpi_ec_read(fan_status_offset,
1854                                         &fan_control_initial_status))) {
1855                         fan_status_access_mode = IBMACPI_FAN_RD_TPEC;
1856
1857                         /* In some ThinkPads, neither the EC nor the ACPI
1858                          * DSDT initialize the fan status, and it ends up
1859                          * being set to 0x07 when it *could* be either
1860                          * 0x07 or 0x80.
1861                          *
1862                          * Enable for TP-1Y (T43), TP-78 (R51e),
1863                          * TP-76 (R52), TP-70 (T43, R52), which are known
1864                          * to be buggy. */
1865                         if (fan_control_initial_status == 0x07 &&
1866                             ibm_thinkpad_ec_found &&
1867                             ((ibm_thinkpad_ec_found[0] == '1' &&
1868                               ibm_thinkpad_ec_found[1] == 'Y') ||
1869                              (ibm_thinkpad_ec_found[0] == '7' &&
1870                               (ibm_thinkpad_ec_found[1] == '6' ||
1871                                ibm_thinkpad_ec_found[1] == '8' ||
1872                                ibm_thinkpad_ec_found[1] == '0'))
1873                             )) {
1874                                 printk(IBM_NOTICE
1875                                        "fan_init: initial fan status is "
1876                                        "unknown, assuming it is in auto "
1877                                        "mode\n");
1878                                 fan_control_status_known = 0;
1879                         }
1880                 } else {
1881                         printk(IBM_ERR
1882                                "ThinkPad ACPI EC access misbehaving, "
1883                                "fan status and control unavailable\n");
1884                         return 0;
1885                 }
1886         }
1887
1888         if (sfan_handle) {
1889                 /* 570, 770x-JL */
1890                 fan_control_access_mode = IBMACPI_FAN_WR_ACPI_SFAN;
1891                 fan_control_commands |=
1892                     IBMACPI_FAN_CMD_LEVEL | IBMACPI_FAN_CMD_ENABLE;
1893         } else {
1894                 if (!gfan_handle) {
1895                         /* gfan without sfan means no fan control */
1896                         /* all other models implement TP EC 0x2f control */
1897
1898                         if (fans_handle) {
1899                                 /* X31, X40, X41 */
1900                                 fan_control_access_mode =
1901                                     IBMACPI_FAN_WR_ACPI_FANS;
1902                                 fan_control_commands |=
1903                                     IBMACPI_FAN_CMD_SPEED |
1904                                     IBMACPI_FAN_CMD_LEVEL |
1905                                     IBMACPI_FAN_CMD_ENABLE;
1906                         } else {
1907                                 fan_control_access_mode = IBMACPI_FAN_WR_TPEC;
1908                                 fan_control_commands |=
1909                                     IBMACPI_FAN_CMD_LEVEL |
1910                                     IBMACPI_FAN_CMD_ENABLE;
1911                         }
1912                 }
1913         }
1914
1915         return 0;
1916 }
1917
1918 static int fan_get_status(u8 *status)
1919 {
1920         u8 s;
1921
1922         /* TODO:
1923          * Add IBMACPI_FAN_RD_ACPI_FANS ? */
1924
1925         switch (fan_status_access_mode) {
1926         case IBMACPI_FAN_RD_ACPI_GFAN:
1927                 /* 570, 600e/x, 770e, 770x */
1928
1929                 if (unlikely(!acpi_evalf(gfan_handle, &s, NULL, "d")))
1930                         return -EIO;
1931
1932                 if (likely(status))
1933                         *status = s & 0x07;
1934
1935                 break;
1936
1937         case IBMACPI_FAN_RD_TPEC:
1938                 /* all except 570, 600e/x, 770e, 770x */
1939                 if (unlikely(!acpi_ec_read(fan_status_offset, &s)))
1940                         return -EIO;
1941
1942                 if (likely(status))
1943                         *status = s;
1944
1945                 break;
1946
1947         default:
1948                 return -ENXIO;
1949         }
1950
1951         return 0;
1952 }
1953
1954 static int fan_get_speed(unsigned int *speed)
1955 {
1956         u8 hi, lo;
1957
1958         switch (fan_status_access_mode) {
1959         case IBMACPI_FAN_RD_TPEC:
1960                 /* all except 570, 600e/x, 770e, 770x */
1961                 if (unlikely(!acpi_ec_read(fan_rpm_offset, &lo) ||
1962                              !acpi_ec_read(fan_rpm_offset + 1, &hi)))
1963                         return -EIO;
1964
1965                 if (likely(speed))
1966                         *speed = (hi << 8) | lo;
1967
1968                 break;
1969
1970         default:
1971                 return -ENXIO;
1972         }
1973
1974         return 0;
1975 }
1976
1977 static void fan_exit(void)
1978 {
1979         cancel_delayed_work(&fan_watchdog_task);
1980         flush_scheduled_work();
1981 }
1982
1983 static void fan_watchdog_reset(void)
1984 {
1985         static int fan_watchdog_active = 0;
1986
1987         if (fan_watchdog_active)
1988                 cancel_delayed_work(&fan_watchdog_task);
1989
1990         if (fan_watchdog_maxinterval > 0) {
1991                 fan_watchdog_active = 1;
1992                 if (!schedule_delayed_work(&fan_watchdog_task,
1993                                 msecs_to_jiffies(fan_watchdog_maxinterval
1994                                                  * 1000))) {
1995                         printk(IBM_ERR "failed to schedule the fan watchdog, "
1996                                "watchdog will not trigger\n");
1997                 }
1998         } else
1999                 fan_watchdog_active = 0;
2000 }
2001
2002 static int fan_read(char *p)
2003 {
2004         int len = 0;
2005         int rc;
2006         u8 status;
2007         unsigned int speed = 0;
2008
2009         switch (fan_status_access_mode) {
2010         case IBMACPI_FAN_RD_ACPI_GFAN:
2011                 /* 570, 600e/x, 770e, 770x */
2012                 if ((rc = fan_get_status(&status)) < 0)
2013                         return rc;
2014
2015                 len += sprintf(p + len, "status:\t\t%s\n"
2016                                "level:\t\t%d\n",
2017                                (status != 0) ? "enabled" : "disabled", status);
2018                 break;
2019
2020         case IBMACPI_FAN_RD_TPEC:
2021                 /* all except 570, 600e/x, 770e, 770x */
2022                 if ((rc = fan_get_status(&status)) < 0)
2023                         return rc;
2024
2025                 if (unlikely(!fan_control_status_known)) {
2026                         if (status != fan_control_initial_status)
2027                                 fan_control_status_known = 1;
2028                         else
2029                                 /* Return most likely status. In fact, it
2030                                  * might be the only possible status */
2031                                 status = IBMACPI_FAN_EC_AUTO;
2032                 }
2033
2034                 len += sprintf(p + len, "status:\t\t%s\n",
2035                                (status != 0) ? "enabled" : "disabled");
2036
2037                 /* No ThinkPad boots on disengaged mode, we can safely
2038                  * assume the tachometer is online if fan control status
2039                  * was unknown */
2040                 if ((rc = fan_get_speed(&speed)) < 0)
2041                         return rc;
2042
2043                 len += sprintf(p + len, "speed:\t\t%d\n", speed);
2044
2045                 if (status & IBMACPI_FAN_EC_DISENGAGED)
2046                         /* Disengaged mode takes precedence */
2047                         len += sprintf(p + len, "level:\t\tdisengaged\n");
2048                 else if (status & IBMACPI_FAN_EC_AUTO)
2049                         len += sprintf(p + len, "level:\t\tauto\n");
2050                 else
2051                         len += sprintf(p + len, "level:\t\t%d\n", status);
2052                 break;
2053
2054         case IBMACPI_FAN_NONE:
2055         default:
2056                 len += sprintf(p + len, "status:\t\tnot supported\n");
2057         }
2058
2059         if (fan_control_commands & IBMACPI_FAN_CMD_LEVEL) {
2060                 len += sprintf(p + len, "commands:\tlevel <level>");
2061
2062                 switch (fan_control_access_mode) {
2063                 case IBMACPI_FAN_WR_ACPI_SFAN:
2064                         len += sprintf(p + len, " (<level> is 0-7)\n");
2065                         break;
2066
2067                 default:
2068                         len += sprintf(p + len, " (<level> is 0-7, "
2069                                        "auto, disengaged)\n");
2070                         break;
2071                 }
2072         }
2073
2074         if (fan_control_commands & IBMACPI_FAN_CMD_ENABLE)
2075                 len += sprintf(p + len, "commands:\tenable, disable\n"
2076                                "commands:\twatchdog <timeout> (<timeout> is 0 (off), "
2077                                "1-120 (seconds))\n");
2078
2079         if (fan_control_commands & IBMACPI_FAN_CMD_SPEED)
2080                 len += sprintf(p + len, "commands:\tspeed <speed>"
2081                                " (<speed> is 0-65535)\n");
2082
2083         return len;
2084 }
2085
2086 static int fan_set_level(int level)
2087 {
2088         switch (fan_control_access_mode) {
2089         case IBMACPI_FAN_WR_ACPI_SFAN:
2090                 if (level >= 0 && level <= 7) {
2091                         if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", level))
2092                                 return -EIO;
2093                 } else
2094                         return -EINVAL;
2095                 break;
2096
2097         case IBMACPI_FAN_WR_ACPI_FANS:
2098         case IBMACPI_FAN_WR_TPEC:
2099                 if ((level != IBMACPI_FAN_EC_AUTO) &&
2100                     (level != IBMACPI_FAN_EC_DISENGAGED) &&
2101                     ((level < 0) || (level > 7)))
2102                         return -EINVAL;
2103
2104                 if (!acpi_ec_write(fan_status_offset, level))
2105                         return -EIO;
2106                 else
2107                         fan_control_status_known = 1;
2108                 break;
2109
2110         default:
2111                 return -ENXIO;
2112         }
2113         return 0;
2114 }
2115
2116 static int fan_set_enable(void)
2117 {
2118         u8 s;
2119         int rc;
2120
2121         switch (fan_control_access_mode) {
2122         case IBMACPI_FAN_WR_ACPI_FANS:
2123         case IBMACPI_FAN_WR_TPEC:
2124                 if ((rc = fan_get_status(&s)) < 0)
2125                         return rc;
2126
2127                 /* Don't go out of emergency fan mode */
2128                 if (s != 7)
2129                         s = IBMACPI_FAN_EC_AUTO;
2130
2131                 if (!acpi_ec_write(fan_status_offset, s))
2132                         return -EIO;
2133                 else
2134                         fan_control_status_known = 1;
2135                 break;
2136
2137         case IBMACPI_FAN_WR_ACPI_SFAN:
2138                 if ((rc = fan_get_status(&s)) < 0)
2139                         return rc;
2140
2141                 s &= 0x07;
2142
2143                 /* Set fan to at least level 4 */
2144                 if (s < 4)
2145                         s = 4;
2146
2147                 if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", s))
2148                         return -EIO;
2149                 break;
2150
2151         default:
2152                 return -ENXIO;
2153         }
2154         return 0;
2155 }
2156
2157 static int fan_set_disable(void)
2158 {
2159         switch (fan_control_access_mode) {
2160         case IBMACPI_FAN_WR_ACPI_FANS:
2161         case IBMACPI_FAN_WR_TPEC:
2162                 if (!acpi_ec_write(fan_status_offset, 0x00))
2163                         return -EIO;
2164                 else
2165                         fan_control_status_known = 1;
2166                 break;
2167
2168         case IBMACPI_FAN_WR_ACPI_SFAN:
2169                 if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", 0x00))
2170                         return -EIO;
2171                 break;
2172
2173         default:
2174                 return -ENXIO;
2175         }
2176         return 0;
2177 }
2178
2179 static int fan_set_speed(int speed)
2180 {
2181         switch (fan_control_access_mode) {
2182         case IBMACPI_FAN_WR_ACPI_FANS:
2183                 if (speed >= 0 && speed <= 65535) {
2184                         if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",
2185                                         speed, speed, speed))
2186                                 return -EIO;
2187                 } else
2188                         return -EINVAL;
2189                 break;
2190
2191         default:
2192                 return -ENXIO;
2193         }
2194         return 0;
2195 }
2196
2197 static int fan_write_cmd_level(const char *cmd, int *rc)
2198 {
2199         int level;
2200
2201         if (strlencmp(cmd, "level auto") == 0)
2202                 level = IBMACPI_FAN_EC_AUTO;
2203         else if (strlencmp(cmd, "level disengaged") == 0)
2204                 level = IBMACPI_FAN_EC_DISENGAGED;
2205         else if (sscanf(cmd, "level %d", &level) != 1)
2206                 return 0;
2207
2208         if ((*rc = fan_set_level(level)) == -ENXIO)
2209                 printk(IBM_ERR "level command accepted for unsupported "
2210                        "access mode %d", fan_control_access_mode);
2211
2212         return 1;
2213 }
2214
2215 static int fan_write_cmd_enable(const char *cmd, int *rc)
2216 {
2217         if (strlencmp(cmd, "enable") != 0)
2218                 return 0;
2219
2220         if ((*rc = fan_set_enable()) == -ENXIO)
2221                 printk(IBM_ERR "enable command accepted for unsupported "
2222                        "access mode %d", fan_control_access_mode);
2223
2224         return 1;
2225 }
2226
2227 static int fan_write_cmd_disable(const char *cmd, int *rc)
2228 {
2229         if (strlencmp(cmd, "disable") != 0)
2230                 return 0;
2231
2232         if ((*rc = fan_set_disable()) == -ENXIO)
2233                 printk(IBM_ERR "disable command accepted for unsupported "
2234                        "access mode %d", fan_control_access_mode);
2235
2236         return 1;
2237 }
2238
2239 static int fan_write_cmd_speed(const char *cmd, int *rc)
2240 {
2241         int speed;
2242
2243         /* TODO:
2244          * Support speed <low> <medium> <high> ? */
2245
2246         if (sscanf(cmd, "speed %d", &speed) != 1)
2247                 return 0;
2248
2249         if ((*rc = fan_set_speed(speed)) == -ENXIO)
2250                 printk(IBM_ERR "speed command accepted for unsupported "
2251                        "access mode %d", fan_control_access_mode);
2252
2253         return 1;
2254 }
2255
2256 static int fan_write_cmd_watchdog(const char *cmd, int *rc)
2257 {
2258         int interval;
2259
2260         if (sscanf(cmd, "watchdog %d", &interval) != 1)
2261                 return 0;
2262
2263         if (interval < 0 || interval > 120)
2264                 *rc = -EINVAL;
2265         else
2266                 fan_watchdog_maxinterval = interval;
2267
2268         return 1;
2269 }
2270
2271 static int fan_write(char *buf)
2272 {
2273         char *cmd;
2274         int rc = 0;
2275
2276         while (!rc && (cmd = next_cmd(&buf))) {
2277                 if (!((fan_control_commands & IBMACPI_FAN_CMD_LEVEL) &&
2278                       fan_write_cmd_level(cmd, &rc)) &&
2279                     !((fan_control_commands & IBMACPI_FAN_CMD_ENABLE) &&
2280                       (fan_write_cmd_enable(cmd, &rc) ||
2281                        fan_write_cmd_disable(cmd, &rc) ||
2282                        fan_write_cmd_watchdog(cmd, &rc))) &&
2283                     !((fan_control_commands & IBMACPI_FAN_CMD_SPEED) &&
2284                       fan_write_cmd_speed(cmd, &rc))
2285                     )
2286                         rc = -EINVAL;
2287                 else if (!rc)
2288                         fan_watchdog_reset();
2289         }
2290
2291         return rc;
2292 }
2293
2294 static void fan_watchdog_fire(struct work_struct *ignored)
2295 {
2296         printk(IBM_NOTICE "fan watchdog: enabling fan\n");
2297         if (fan_set_enable()) {
2298                 printk(IBM_ERR "fan watchdog: error while enabling fan\n");
2299                 /* reschedule for later */
2300                 fan_watchdog_reset();
2301         }
2302 }
2303
2304 static struct ibm_struct ibms[] = {
2305         {
2306          .name = "driver",
2307          .init = ibm_acpi_driver_init,
2308          .read = driver_read,
2309          },
2310         {
2311          .name = "hotkey",
2312          .hid = IBM_HKEY_HID,
2313          .init = hotkey_init,
2314          .read = hotkey_read,
2315          .write = hotkey_write,
2316          .exit = hotkey_exit,
2317          .notify = hotkey_notify,
2318          .handle = &hkey_handle,
2319          .type = ACPI_DEVICE_NOTIFY,
2320          },
2321         {
2322          .name = "bluetooth",
2323          .init = bluetooth_init,
2324          .read = bluetooth_read,
2325          .write = bluetooth_write,
2326          },
2327         {
2328          .name = "wan",
2329          .init = wan_init,
2330          .read = wan_read,
2331          .write = wan_write,
2332          .experimental = 1,
2333          },
2334         {
2335          .name = "video",
2336          .init = video_init,
2337          .read = video_read,
2338          .write = video_write,
2339          .exit = video_exit,
2340          },
2341         {
2342          .name = "light",
2343          .init = light_init,
2344          .read = light_read,
2345          .write = light_write,
2346          },
2347 #ifdef CONFIG_ACPI_IBM_DOCK
2348         {
2349          .name = "dock",
2350          .read = dock_read,
2351          .write = dock_write,
2352          .notify = dock_notify,
2353          .handle = &dock_handle,
2354          .type = ACPI_SYSTEM_NOTIFY,
2355          },
2356         {
2357          .name = "dock",
2358          .hid = IBM_PCI_HID,
2359          .notify = dock_notify,
2360          .handle = &pci_handle,
2361          .type = ACPI_SYSTEM_NOTIFY,
2362          },
2363 #endif
2364         {
2365          .name = "bay",
2366          .init = bay_init,
2367          .read = bay_read,
2368          .write = bay_write,
2369          .notify = bay_notify,
2370          .handle = &bay_handle,
2371          .type = ACPI_SYSTEM_NOTIFY,
2372          },
2373         {
2374          .name = "cmos",
2375          .read = cmos_read,
2376          .write = cmos_write,
2377          },
2378         {
2379          .name = "led",
2380          .init = led_init,
2381          .read = led_read,
2382          .write = led_write,
2383          },
2384         {
2385          .name = "beep",
2386          .read = beep_read,
2387          .write = beep_write,
2388          },
2389         {
2390          .name = "thermal",
2391          .init = thermal_init,
2392          .read = thermal_read,
2393          },
2394         {
2395          .name = "ecdump",
2396          .read = ecdump_read,
2397          .write = ecdump_write,
2398          .experimental = 1,
2399          },
2400         {
2401          .name = "brightness",
2402          .read = brightness_read,
2403          .write = brightness_write,
2404          .init = brightness_init,
2405          .exit = brightness_exit,
2406          },
2407         {
2408          .name = "volume",
2409          .read = volume_read,
2410          .write = volume_write,
2411          },
2412         {
2413          .name = "fan",
2414          .read = fan_read,
2415          .write = fan_write,
2416          .init = fan_init,
2417          .exit = fan_exit,
2418          .experimental = 1,
2419          },
2420 };
2421
2422 static int dispatch_read(char *page, char **start, off_t off, int count,
2423                          int *eof, void *data)
2424 {
2425         struct ibm_struct *ibm = data;
2426         int len;
2427
2428         if (!ibm || !ibm->read)
2429                 return -EINVAL;
2430
2431         len = ibm->read(page);
2432         if (len < 0)
2433                 return len;
2434
2435         if (len <= off + count)
2436                 *eof = 1;
2437         *start = page + off;
2438         len -= off;
2439         if (len > count)
2440                 len = count;
2441         if (len < 0)
2442                 len = 0;
2443
2444         return len;
2445 }
2446
2447 static int dispatch_write(struct file *file, const char __user * userbuf,
2448                           unsigned long count, void *data)
2449 {
2450         struct ibm_struct *ibm = data;
2451         char *kernbuf;
2452         int ret;
2453
2454         if (!ibm || !ibm->write)
2455                 return -EINVAL;
2456
2457         kernbuf = kmalloc(count + 2, GFP_KERNEL);
2458         if (!kernbuf)
2459                 return -ENOMEM;
2460
2461         if (copy_from_user(kernbuf, userbuf, count)) {
2462                 kfree(kernbuf);
2463                 return -EFAULT;
2464         }
2465
2466         kernbuf[count] = 0;
2467         strcat(kernbuf, ",");
2468         ret = ibm->write(kernbuf);
2469         if (ret == 0)
2470                 ret = count;
2471
2472         kfree(kernbuf);
2473
2474         return ret;
2475 }
2476
2477 static void dispatch_notify(acpi_handle handle, u32 event, void *data)
2478 {
2479         struct ibm_struct *ibm = data;
2480
2481         if (!ibm || !ibm->notify)
2482                 return;
2483
2484         ibm->notify(ibm, event);
2485 }
2486
2487 static int __init setup_notify(struct ibm_struct *ibm)
2488 {
2489         acpi_status status;
2490         int ret;
2491
2492         if (!*ibm->handle)
2493                 return 0;
2494
2495         ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
2496         if (ret < 0) {
2497                 printk(IBM_ERR "%s device not present\n", ibm->name);
2498                 return 0;
2499         }
2500
2501         acpi_driver_data(ibm->device) = ibm;
2502         sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
2503
2504         status = acpi_install_notify_handler(*ibm->handle, ibm->type,
2505                                              dispatch_notify, ibm);
2506         if (ACPI_FAILURE(status)) {
2507                 printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
2508                        ibm->name, status);
2509                 return -ENODEV;
2510         }
2511         ibm->notify_installed = 1;
2512         return 0;
2513 }
2514
2515 static int __init ibm_device_add(struct acpi_device *device)
2516 {
2517         return 0;
2518 }
2519
2520 static int __init register_driver(struct ibm_struct *ibm)
2521 {
2522         int ret;
2523
2524         ibm->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
2525         if (!ibm->driver) {
2526                 printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
2527                 return -1;
2528         }
2529
2530         sprintf(ibm->driver->name, "%s_%s", IBM_NAME, ibm->name);
2531         ibm->driver->ids = ibm->hid;
2532         ibm->driver->ops.add = &ibm_device_add;
2533
2534         ret = acpi_bus_register_driver(ibm->driver);
2535         if (ret < 0) {
2536                 printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
2537                        ibm->hid, ret);
2538                 kfree(ibm->driver);
2539         }
2540
2541         return ret;
2542 }
2543
2544 static int __init ibm_init(struct ibm_struct *ibm)
2545 {
2546         int ret;
2547         struct proc_dir_entry *entry;
2548
2549         if (ibm->experimental && !experimental)
2550                 return 0;
2551
2552         if (ibm->hid) {
2553                 ret = register_driver(ibm);
2554                 if (ret < 0)
2555                         return ret;
2556                 ibm->driver_registered = 1;
2557         }
2558
2559         if (ibm->init) {
2560                 ret = ibm->init();
2561                 if (ret != 0)
2562                         return ret;
2563                 ibm->init_called = 1;
2564         }
2565
2566         if (ibm->read) {
2567                 entry = create_proc_entry(ibm->name,
2568                                           S_IFREG | S_IRUGO | S_IWUSR,
2569                                           proc_dir);
2570                 if (!entry) {
2571                         printk(IBM_ERR "unable to create proc entry %s\n",
2572                                ibm->name);
2573                         return -ENODEV;
2574                 }
2575                 entry->owner = THIS_MODULE;
2576                 entry->data = ibm;
2577                 entry->read_proc = &dispatch_read;
2578                 if (ibm->write)
2579                         entry->write_proc = &dispatch_write;
2580                 ibm->proc_created = 1;
2581         }
2582
2583         if (ibm->notify) {
2584                 ret = setup_notify(ibm);
2585                 if (ret < 0)
2586                         return ret;
2587         }
2588
2589         return 0;
2590 }
2591
2592 static void ibm_exit(struct ibm_struct *ibm)
2593 {
2594         if (ibm->notify_installed)
2595                 acpi_remove_notify_handler(*ibm->handle, ibm->type,
2596                                            dispatch_notify);
2597
2598         if (ibm->proc_created)
2599                 remove_proc_entry(ibm->name, proc_dir);
2600
2601         if (ibm->init_called && ibm->exit)
2602                 ibm->exit();
2603
2604         if (ibm->driver_registered) {
2605                 acpi_bus_unregister_driver(ibm->driver);
2606                 kfree(ibm->driver);
2607         }
2608 }
2609
2610 static void __init ibm_handle_init(char *name,
2611                                    acpi_handle * handle, acpi_handle parent,
2612                                    char **paths, int num_paths, char **path)
2613 {
2614         int i;
2615         acpi_status status;
2616
2617         for (i = 0; i < num_paths; i++) {
2618                 status = acpi_get_handle(parent, paths[i], handle);
2619                 if (ACPI_SUCCESS(status)) {
2620                         *path = paths[i];
2621                         return;
2622                 }
2623         }
2624
2625         *handle = NULL;
2626 }
2627
2628 #define IBM_HANDLE_INIT(object)                                         \
2629         ibm_handle_init(#object, &object##_handle, *object##_parent,    \
2630                 object##_paths, ARRAY_SIZE(object##_paths), &object##_path)
2631
2632 static int __init set_ibm_param(const char *val, struct kernel_param *kp)
2633 {
2634         unsigned int i;
2635
2636         for (i = 0; i < ARRAY_SIZE(ibms); i++)
2637                 if (strcmp(ibms[i].name, kp->name) == 0 && ibms[i].write) {
2638                         if (strlen(val) > sizeof(ibms[i].param) - 2)
2639                                 return -ENOSPC;
2640                         strcpy(ibms[i].param, val);
2641                         strcat(ibms[i].param, ",");
2642                         return 0;
2643                 }
2644
2645         return -EINVAL;
2646 }
2647
2648 #define IBM_PARAM(feature) \
2649         module_param_call(feature, set_ibm_param, NULL, NULL, 0)
2650
2651 IBM_PARAM(hotkey);
2652 IBM_PARAM(bluetooth);
2653 IBM_PARAM(video);
2654 IBM_PARAM(light);
2655 #ifdef CONFIG_ACPI_IBM_DOCK
2656 IBM_PARAM(dock);
2657 #endif
2658 IBM_PARAM(bay);
2659 IBM_PARAM(cmos);
2660 IBM_PARAM(led);
2661 IBM_PARAM(beep);
2662 IBM_PARAM(ecdump);
2663 IBM_PARAM(brightness);
2664 IBM_PARAM(volume);
2665 IBM_PARAM(fan);
2666
2667 static void acpi_ibm_exit(void)
2668 {
2669         int i;
2670
2671         for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
2672                 ibm_exit(&ibms[i]);
2673
2674         if (proc_dir)
2675                 remove_proc_entry(IBM_DIR, acpi_root_dir);
2676
2677         if (ibm_thinkpad_ec_found)
2678                 kfree(ibm_thinkpad_ec_found);
2679 }
2680
2681 static char* __init check_dmi_for_ec(void)
2682 {
2683         struct dmi_device *dev = NULL;
2684         char ec_fw_string[18];
2685
2686         /*
2687          * ThinkPad T23 or newer, A31 or newer, R50e or newer,
2688          * X32 or newer, all Z series;  Some models must have an
2689          * up-to-date BIOS or they will not be detected.
2690          *
2691          * See http://thinkwiki.org/wiki/List_of_DMI_IDs
2692          */
2693         while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) {
2694                 if (sscanf(dev->name,
2695                            "IBM ThinkPad Embedded Controller -[%17c",
2696                            ec_fw_string) == 1) {
2697                         ec_fw_string[sizeof(ec_fw_string) - 1] = 0;
2698                         ec_fw_string[strcspn(ec_fw_string, " ]")] = 0;
2699                         return kstrdup(ec_fw_string, GFP_KERNEL);
2700                 }
2701         }
2702         return NULL;
2703 }
2704
2705 static int __init acpi_ibm_init(void)
2706 {
2707         int ret, i;
2708
2709         if (acpi_disabled)
2710                 return -ENODEV;
2711
2712         /* ec is required because many other handles are relative to it */
2713         IBM_HANDLE_INIT(ec);
2714         if (!ec_handle) {
2715                 printk(IBM_ERR "ec object not found\n");
2716                 return -ENODEV;
2717         }
2718
2719         /* Models with newer firmware report the EC in DMI */
2720         ibm_thinkpad_ec_found = check_dmi_for_ec();
2721
2722         /* these handles are not required */
2723         IBM_HANDLE_INIT(vid);
2724         IBM_HANDLE_INIT(vid2);
2725         IBM_HANDLE_INIT(ledb);
2726         IBM_HANDLE_INIT(led);
2727         IBM_HANDLE_INIT(hkey);
2728         IBM_HANDLE_INIT(lght);
2729         IBM_HANDLE_INIT(cmos);
2730 #ifdef CONFIG_ACPI_IBM_DOCK
2731         IBM_HANDLE_INIT(dock);
2732 #endif
2733         IBM_HANDLE_INIT(pci);
2734         IBM_HANDLE_INIT(bay);
2735         if (bay_handle)
2736                 IBM_HANDLE_INIT(bay_ej);
2737         IBM_HANDLE_INIT(bay2);
2738         if (bay2_handle)
2739                 IBM_HANDLE_INIT(bay2_ej);
2740         IBM_HANDLE_INIT(beep);
2741         IBM_HANDLE_INIT(ecrd);
2742         IBM_HANDLE_INIT(ecwr);
2743         IBM_HANDLE_INIT(fans);
2744         IBM_HANDLE_INIT(gfan);
2745         IBM_HANDLE_INIT(sfan);
2746
2747         proc_dir = proc_mkdir(IBM_DIR, acpi_root_dir);
2748         if (!proc_dir) {
2749                 printk(IBM_ERR "unable to create proc dir %s", IBM_DIR);
2750                 acpi_ibm_exit();
2751                 return -ENODEV;
2752         }
2753         proc_dir->owner = THIS_MODULE;
2754
2755         for (i = 0; i < ARRAY_SIZE(ibms); i++) {
2756                 ret = ibm_init(&ibms[i]);
2757                 if (ret >= 0 && *ibms[i].param)
2758                         ret = ibms[i].write(ibms[i].param);
2759                 if (ret < 0) {
2760                         acpi_ibm_exit();
2761                         return ret;
2762                 }
2763         }
2764
2765         return 0;
2766 }
2767
2768 module_init(acpi_ibm_init);
2769 module_exit(acpi_ibm_exit);