drivers/acpi/toshiba_acpi.c

   1 /*
   2  *  toshiba_acpi.c - Toshiba Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2004 John Belmonte
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The devolpment page for this driver is located at
  23  *  http://memebeam.org/toys/ToshibaAcpiDriver.
  24  *
  25  *  Credits:
  26  *      Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
  27  *              engineering the Windows drivers
  28  *      Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
  29  *      Rob Miller - TV out and hotkeys help
  30  *
  31  *
  32  *  TODO
  33  *
  34  */
  35
  36 #define TOSHIBA_ACPI_VERSION    "0.18"
  37 #define PROC_INTERFACE_VERSION  1
  38
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/types.h>
  43 #include <linux/proc_fs.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <acpi/acpi_drivers.h>
  47
  48 MODULE_AUTHOR("John Belmonte");
  49 MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
  50 MODULE_LICENSE("GPL");
  51
  52 #define MY_LOGPREFIX "toshiba_acpi: "
  53 #define MY_ERR KERN_ERR MY_LOGPREFIX
  54 #define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
  55 #define MY_INFO KERN_INFO MY_LOGPREFIX
  56
  57 /* Toshiba ACPI method paths */
  58 #define METHOD_LCD_BRIGHTNESS   "\\_SB_.PCI0.VGA_.LCD_._BCM"
  59 #define METHOD_HCI_1            "\\_SB_.VALD.GHCI"
  60 #define METHOD_HCI_2            "\\_SB_.VALZ.GHCI"
  61 #define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
  62
  63 /* Toshiba HCI interface definitions
  64  *
  65  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  66  * be uniform across all their models.  Ideally we would just call
  67  * dedicated ACPI methods instead of using this primitive interface.
  68  * However the ACPI methods seem to be incomplete in some areas (for
  69  * example they allow setting, but not reading, the LCD brightness value),
  70  * so this is still useful.
  71  */
  72
  73 #define HCI_WORDS                       6
  74
  75 /* operations */
  76 #define HCI_SET                         0xff00
  77 #define HCI_GET                         0xfe00
  78
  79 /* return codes */
  80 #define HCI_SUCCESS                     0x0000
  81 #define HCI_FAILURE                     0x1000
  82 #define HCI_NOT_SUPPORTED               0x8000
  83 #define HCI_EMPTY                       0x8c00
  84
  85 /* registers */
  86 #define HCI_FAN                         0x0004
  87 #define HCI_SYSTEM_EVENT                0x0016
  88 #define HCI_VIDEO_OUT                   0x001c
  89 #define HCI_HOTKEY_EVENT                0x001e
  90 #define HCI_LCD_BRIGHTNESS              0x002a
  91
  92 /* field definitions */
  93 #define HCI_LCD_BRIGHTNESS_BITS         3
  94 #define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
  95 #define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
  96 #define HCI_VIDEO_OUT_LCD               0x1
  97 #define HCI_VIDEO_OUT_CRT               0x2
  98 #define HCI_VIDEO_OUT_TV                0x4
  99
 100 /* utility
 101  */
 102
 103 static __inline__ void
 104 _set_bit(u32* word, u32 mask, int value)
 105 {
 106         *word = (*word & ~mask) | (mask * value);
 107 }
 108
 109 /* acpi interface wrappers
 110  */
 111
 112 static int
 113 is_valid_acpi_path(const char* methodName)
 114 {
 115         acpi_handle handle;
 116         acpi_status status;
 117
 118         status = acpi_get_handle(NULL, (char*)methodName, &handle);
 119         return !ACPI_FAILURE(status);
 120 }
 121
 122 static int
 123 write_acpi_int(const char* methodName, int val)
 124 {
 125         struct acpi_object_list params;
 126         union acpi_object in_objs[1];
 127         acpi_status status;
 128
 129         params.count = sizeof(in_objs)/sizeof(in_objs[0]);
 130         params.pointer = in_objs;
 131         in_objs[0].type = ACPI_TYPE_INTEGER;
 132         in_objs[0].integer.value = val;
 133
 134         status = acpi_evaluate_object(NULL, (char*)methodName, &params, NULL);
 135         return (status == AE_OK);
 136 }
 137
 138 #if 0
 139 static int
 140 read_acpi_int(const char* methodName, int* pVal)
 141 {
 142         struct acpi_buffer results;
 143         union acpi_object out_objs[1];
 144         acpi_status status;
 145
 146         results.length = sizeof(out_objs);
 147         results.pointer = out_objs;
 148
 149         status = acpi_evaluate_object(0, (char*)methodName, 0, &results);
 150         *pVal = out_objs[0].integer.value;
 151
 152         return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
 153 }
 154 #endif
 155
 156 static const char*              method_hci /*= 0*/;
 157
 158 /* Perform a raw HCI call.  Here we don't care about input or output buffer
 159  * format.
 160  */
 161 static acpi_status
 162 hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
 163 {
 164         struct acpi_object_list params;
 165         union acpi_object in_objs[HCI_WORDS];
 166         struct acpi_buffer results;
 167         union acpi_object out_objs[HCI_WORDS+1];
 168         acpi_status status;
 169         int i;
 170
 171         params.count = HCI_WORDS;
 172         params.pointer = in_objs;
 173         for (i = 0; i < HCI_WORDS; ++i) {
 174                 in_objs[i].type = ACPI_TYPE_INTEGER;
 175                 in_objs[i].integer.value = in[i];
 176         }
 177
 178         results.length = sizeof(out_objs);
 179         results.pointer = out_objs;
 180
 181         status = acpi_evaluate_object(NULL, (char*)method_hci, &params,
 182                 &results);
 183         if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
 184                 for (i = 0; i < out_objs->package.count; ++i) {
 185                         out[i] = out_objs->package.elements[i].integer.value;
 186                 }
 187         }
 188
 189         return status;
 190 }
 191
 192 /* common hci tasks (get or set one value)
 193  *
 194  * In addition to the ACPI status, the HCI system returns a result which
 195  * may be useful (such as "not supported").
 196  */
 197
 198 static acpi_status
 199 hci_write1(u32 reg, u32 in1, u32* result)
 200 {
 201         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
 202         u32 out[HCI_WORDS];
 203         acpi_status status = hci_raw(in, out);
 204         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 205         return status;
 206 }
 207
 208 static acpi_status
 209 hci_read1(u32 reg, u32* out1, u32* result)
 210 {
 211         u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
 212         u32 out[HCI_WORDS];
 213         acpi_status status = hci_raw(in, out);
 214         *out1 = out[2];
 215         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 216         return status;
 217 }
 218
 219 static struct proc_dir_entry*   toshiba_proc_dir /*= 0*/;
 220 static int                      force_fan;
 221 static int                      last_key_event;
 222 static int                      key_event_valid;
 223
 224 typedef struct _ProcItem
 225 {
 226         const char* name;
 227         char* (*read_func)(char*);
 228         unsigned long (*write_func)(const char*, unsigned long);
 229 } ProcItem;
 230
 231 /* proc file handlers
 232  */
 233
 234 static int
 235 dispatch_read(char* page, char** start, off_t off, int count, int* eof,
 236         ProcItem* item)
 237 {
 238         char* p = page;
 239         int len;
 240
 241         if (off == 0)
 242                 p = item->read_func(p);
 243
 244         /* ISSUE: I don't understand this code */
 245         len = (p - page);
 246         if (len <= off+count) *eof = 1;
 247         *start = page + off;
 248         len -= off;
 249         if (len>count) len = count;
 250         if (len<0) len = 0;
 251         return len;
 252 }
 253
 254 static int
 255 dispatch_write(struct file* file, const char __user * buffer,
 256         unsigned long count, ProcItem* item)
 257 {
 258         int result;
 259         char* tmp_buffer;
 260
 261         /* Arg buffer points to userspace memory, which can't be accessed
 262          * directly.  Since we're making a copy, zero-terminate the
 263          * destination so that sscanf can be used on it safely.
 264          */
 265         tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
 266         if (copy_from_user(tmp_buffer, buffer, count)) {
 267                 result = -EFAULT;
 268         }
 269         else {
 270                 tmp_buffer[count] = 0;
 271                 result = item->write_func(tmp_buffer, count);
 272         }
 273         kfree(tmp_buffer);
 274         return result;
 275 }
 276
 277 static char*
 278 read_lcd(char* p)
 279 {
 280         u32 hci_result;
 281         u32 value;
 282
 283         hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
 284         if (hci_result == HCI_SUCCESS) {
 285                 value = value >> HCI_LCD_BRIGHTNESS_SHIFT;
 286                 p += sprintf(p, "brightness:              %d\n", value);
 287                 p += sprintf(p, "brightness_levels:       %d\n",
 288                         HCI_LCD_BRIGHTNESS_LEVELS);
 289         } else {
 290                 printk(MY_ERR "Error reading LCD brightness\n");
 291         }
 292
 293         return p;
 294 }
 295
 296 static unsigned long
 297 write_lcd(const char* buffer, unsigned long count)
 298 {
 299         int value;
 300         u32 hci_result;
 301
 302         if (sscanf(buffer, " brightness : %i", &value) == 1 &&
 303                         value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
 304                 value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 305                 hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
 306                 if (hci_result != HCI_SUCCESS)
 307                         return -EFAULT;
 308         } else {
 309                 return -EINVAL;
 310         }
 311
 312         return count;
 313 }
 314
 315 static char*
 316 read_video(char* p)
 317 {
 318         u32 hci_result;
 319         u32 value;
 320
 321         hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
 322         if (hci_result == HCI_SUCCESS) {
 323                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 324                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 325                 int is_tv  = (value & HCI_VIDEO_OUT_TV ) ? 1 : 0;
 326                 p += sprintf(p, "lcd_out:                 %d\n", is_lcd);
 327                 p += sprintf(p, "crt_out:                 %d\n", is_crt);
 328                 p += sprintf(p, "tv_out:                  %d\n", is_tv);
 329         } else {
 330                 printk(MY_ERR "Error reading video out status\n");
 331         }
 332
 333         return p;
 334 }
 335
 336 static unsigned long
 337 write_video(const char* buffer, unsigned long count)
 338 {
 339         int value;
 340         int remain = count;
 341         int lcd_out = -1;
 342         int crt_out = -1;
 343         int tv_out = -1;
 344         u32 hci_result;
 345         int video_out;
 346
 347         /* scan expression.  Multiple expressions may be delimited with ;
 348          *
 349          *  NOTE: to keep scanning simple, invalid fields are ignored
 350          */
 351         while (remain) {
 352                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 353                         lcd_out = value & 1;
 354                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 355                         crt_out = value & 1;
 356                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 357                         tv_out = value & 1;
 358                 /* advance to one character past the next ; */
 359                 do {
 360                         ++buffer;
 361                         --remain;
 362                 }
 363                 while (remain && *(buffer-1) != ';');
 364         }
 365
 366         hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
 367         if (hci_result == HCI_SUCCESS) {
 368                 int new_video_out = video_out;
 369                 if (lcd_out != -1)
 370                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 371                 if (crt_out != -1)
 372                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 373                 if (tv_out != -1)
 374                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 375                 /* To avoid unnecessary video disruption, only write the new
 376                  * video setting if something changed. */
 377                 if (new_video_out != video_out)
 378                         write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 379         } else {
 380                 return -EFAULT;
 381         }
 382
 383         return count;
 384 }
 385
 386 static char*
 387 read_fan(char* p)
 388 {
 389         u32 hci_result;
 390         u32 value;
 391
 392         hci_read1(HCI_FAN, &value, &hci_result);
 393         if (hci_result == HCI_SUCCESS) {
 394                 p += sprintf(p, "running:                 %d\n", (value > 0));
 395                 p += sprintf(p, "force_on:                %d\n", force_fan);
 396         } else {
 397                 printk(MY_ERR "Error reading fan status\n");
 398         }
 399
 400         return p;
 401 }
 402
 403 static unsigned long
 404 write_fan(const char* buffer, unsigned long count)
 405 {
 406         int value;
 407         u32 hci_result;
 408
 409         if (sscanf(buffer, " force_on : %i", &value) == 1 &&
 410                         value >= 0 && value <= 1) {
 411                 hci_write1(HCI_FAN, value, &hci_result);
 412                 if (hci_result != HCI_SUCCESS)
 413                         return -EFAULT;
 414                 else
 415                         force_fan = value;
 416         } else {
 417                 return -EINVAL;
 418         }
 419
 420         return count;
 421 }
 422
 423 static char*
 424 read_keys(char* p)
 425 {
 426         u32 hci_result;
 427         u32 value;
 428
 429         if (!key_event_valid) {
 430                 hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
 431                 if (hci_result == HCI_SUCCESS) {
 432                         key_event_valid = 1;
 433                         last_key_event = value;
 434                 } else if (hci_result == HCI_EMPTY) {
 435                         /* better luck next time */
 436                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 437                         /* This is a workaround for an unresolved issue on
 438                          * some machines where system events sporadically
 439                          * become disabled. */
 440                         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 441                         printk(MY_NOTICE "Re-enabled hotkeys\n");
 442                 } else {
 443                         printk(MY_ERR "Error reading hotkey status\n");
 444                         goto end;
 445                 }
 446         }
 447
 448         p += sprintf(p, "hotkey_ready:            %d\n", key_event_valid);
 449         p += sprintf(p, "hotkey:                  0x%04x\n", last_key_event);
 450
 451 end:
 452         return p;
 453 }
 454
 455 static unsigned long
 456 write_keys(const char* buffer, unsigned long count)
 457 {
 458         int value;
 459
 460         if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 &&
 461                         value == 0) {
 462                 key_event_valid = 0;
 463         } else {
 464                 return -EINVAL;
 465         }
 466
 467         return count;
 468 }
 469
 470 static char*
 471 read_version(char* p)
 472 {
 473         p += sprintf(p, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 474         p += sprintf(p, "proc_interface:          %d\n",
 475                 PROC_INTERFACE_VERSION);
 476         return p;
 477 }
 478
 479 /* proc and module init
 480  */
 481
 482 #define PROC_TOSHIBA            "toshiba"
 483
 484 static ProcItem proc_items[] =
 485 {
 486         { "lcd"         , read_lcd      , write_lcd     },
 487         { "video"       , read_video    , write_video   },
 488         { "fan"         , read_fan      , write_fan     },
 489         { "keys"        , read_keys     , write_keys    },
 490         { "version"     , read_version  , NULL          },
 491         { NULL }
 492 };
 493
 494 static acpi_status __init
 495 add_device(void)
 496 {
 497         struct proc_dir_entry* proc;
 498         ProcItem* item;
 499
 500         for (item = proc_items; item->name; ++item)
 501         {
 502                 proc = create_proc_read_entry(item->name,
 503                         S_IFREG | S_IRUGO | S_IWUSR,
 504                         toshiba_proc_dir, (read_proc_t*)dispatch_read, item);
 505                 if (proc)
 506                         proc->owner = THIS_MODULE;
 507                 if (proc && item->write_func)
 508                         proc->write_proc = (write_proc_t*)dispatch_write;
 509         }
 510
 511         return AE_OK;
 512 }
 513
 514 static acpi_status __exit
 515 remove_device(void)
 516 {
 517         ProcItem* item;
 518
 519         for (item = proc_items; item->name; ++item)
 520                 remove_proc_entry(item->name, toshiba_proc_dir);
 521         return AE_OK;
 522 }
 523
 524 static int __init
 525 toshiba_acpi_init(void)
 526 {
 527         acpi_status status = AE_OK;
 528         u32 hci_result;
 529
 530         if (acpi_disabled)
 531                 return -ENODEV;
 532         /* simple device detection: look for HCI method */
 533         if (is_valid_acpi_path(METHOD_HCI_1))
 534                 method_hci = METHOD_HCI_1;
 535         else if (is_valid_acpi_path(METHOD_HCI_2))
 536                 method_hci = METHOD_HCI_2;
 537         else
 538                 return -ENODEV;
 539
 540         printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
 541                 TOSHIBA_ACPI_VERSION);
 542         printk(MY_INFO "    HCI method: %s\n", method_hci);
 543
 544         force_fan = 0;
 545         key_event_valid = 0;
 546
 547         /* enable event fifo */
 548         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 549
 550         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
 551         if (!toshiba_proc_dir) {
 552                 status = AE_ERROR;
 553         } else {
 554                 toshiba_proc_dir->owner = THIS_MODULE;
 555                 status = add_device();
 556                 if (ACPI_FAILURE(status))
 557                         remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 558         }
 559
 560         return (ACPI_SUCCESS(status)) ? 0 : -ENODEV;
 561 }
 562
 563 static void __exit
 564 toshiba_acpi_exit(void)
 565 {
 566         remove_device();
 567
 568         if (toshiba_proc_dir)
 569                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 570
 571         return;
 572 }
 573
 574 module_init(toshiba_acpi_init);
 575 module_exit(toshiba_acpi_exit);