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 <linux/backlight.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include <acpi/acpi_drivers.h>
  49
  50 MODULE_AUTHOR("John Belmonte");
  51 MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 #define MY_LOGPREFIX "toshiba_acpi: "
  55 #define MY_ERR KERN_ERR MY_LOGPREFIX
  56 #define MY_NOTICE KERN_NOTICE MY_LOGPREFIX
  57 #define MY_INFO KERN_INFO MY_LOGPREFIX
  58
  59 /* Toshiba ACPI method paths */
  60 #define METHOD_LCD_BRIGHTNESS   "\\_SB_.PCI0.VGA_.LCD_._BCM"
  61 #define METHOD_HCI_1            "\\_SB_.VALD.GHCI"
  62 #define METHOD_HCI_2            "\\_SB_.VALZ.GHCI"
  63 #define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
  64
  65 /* Toshiba HCI interface definitions
  66  *
  67  * HCI is Toshiba's "Hardware Control Interface" which is supposed to
  68  * be uniform across all their models.  Ideally we would just call
  69  * dedicated ACPI methods instead of using this primitive interface.
  70  * However the ACPI methods seem to be incomplete in some areas (for
  71  * example they allow setting, but not reading, the LCD brightness value),
  72  * so this is still useful.
  73  */
  74
  75 #define HCI_WORDS                       6
  76
  77 /* operations */
  78 #define HCI_SET                         0xff00
  79 #define HCI_GET                         0xfe00
  80
  81 /* return codes */
  82 #define HCI_SUCCESS                     0x0000
  83 #define HCI_FAILURE                     0x1000
  84 #define HCI_NOT_SUPPORTED               0x8000
  85 #define HCI_EMPTY                       0x8c00
  86
  87 /* registers */
  88 #define HCI_FAN                         0x0004
  89 #define HCI_SYSTEM_EVENT                0x0016
  90 #define HCI_VIDEO_OUT                   0x001c
  91 #define HCI_HOTKEY_EVENT                0x001e
  92 #define HCI_LCD_BRIGHTNESS              0x002a
  93
  94 /* field definitions */
  95 #define HCI_LCD_BRIGHTNESS_BITS         3
  96 #define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
  97 #define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
  98 #define HCI_VIDEO_OUT_LCD               0x1
  99 #define HCI_VIDEO_OUT_CRT               0x2
 100 #define HCI_VIDEO_OUT_TV                0x4
 101
 102 static const struct acpi_device_id toshiba_device_ids[] = {
 103         {"TOS6200", 0},
 104         {"TOS1900", 0},
 105         {"", 0},
 106 };
 107 MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);
 108
 109 /* utility
 110  */
 111
 112 static __inline__ void _set_bit(u32 * word, u32 mask, int value)
 113 {
 114         *word = (*word & ~mask) | (mask * value);
 115 }
 116
 117 /* acpi interface wrappers
 118  */
 119
 120 static int is_valid_acpi_path(const char *methodName)
 121 {
 122         acpi_handle handle;
 123         acpi_status status;
 124
 125         status = acpi_get_handle(NULL, (char *)methodName, &handle);
 126         return !ACPI_FAILURE(status);
 127 }
 128
 129 static int write_acpi_int(const char *methodName, int val)
 130 {
 131         struct acpi_object_list params;
 132         union acpi_object in_objs[1];
 133         acpi_status status;
 134
 135         params.count = ARRAY_SIZE(in_objs);
 136         params.pointer = in_objs;
 137         in_objs[0].type = ACPI_TYPE_INTEGER;
 138         in_objs[0].integer.value = val;
 139
 140         status = acpi_evaluate_object(NULL, (char *)methodName, &params, NULL);
 141         return (status == AE_OK);
 142 }
 143
 144 #if 0
 145 static int read_acpi_int(const char *methodName, int *pVal)
 146 {
 147         struct acpi_buffer results;
 148         union acpi_object out_objs[1];
 149         acpi_status status;
 150
 151         results.length = sizeof(out_objs);
 152         results.pointer = out_objs;
 153
 154         status = acpi_evaluate_object(0, (char *)methodName, 0, &results);
 155         *pVal = out_objs[0].integer.value;
 156
 157         return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
 158 }
 159 #endif
 160
 161 static const char *method_hci /*= 0*/ ;
 162
 163 /* Perform a raw HCI call.  Here we don't care about input or output buffer
 164  * format.
 165  */
 166 static acpi_status hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
 167 {
 168         struct acpi_object_list params;
 169         union acpi_object in_objs[HCI_WORDS];
 170         struct acpi_buffer results;
 171         union acpi_object out_objs[HCI_WORDS + 1];
 172         acpi_status status;
 173         int i;
 174
 175         params.count = HCI_WORDS;
 176         params.pointer = in_objs;
 177         for (i = 0; i < HCI_WORDS; ++i) {
 178                 in_objs[i].type = ACPI_TYPE_INTEGER;
 179                 in_objs[i].integer.value = in[i];
 180         }
 181
 182         results.length = sizeof(out_objs);
 183         results.pointer = out_objs;
 184
 185         status = acpi_evaluate_object(NULL, (char *)method_hci, &params,
 186                                       &results);
 187         if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
 188                 for (i = 0; i < out_objs->package.count; ++i) {
 189                         out[i] = out_objs->package.elements[i].integer.value;
 190                 }
 191         }
 192
 193         return status;
 194 }
 195
 196 /* common hci tasks (get or set one value)
 197  *
 198  * In addition to the ACPI status, the HCI system returns a result which
 199  * may be useful (such as "not supported").
 200  */
 201
 202 static acpi_status hci_write1(u32 reg, u32 in1, u32 * result)
 203 {
 204         u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
 205         u32 out[HCI_WORDS];
 206         acpi_status status = hci_raw(in, out);
 207         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 208         return status;
 209 }
 210
 211 static acpi_status hci_read1(u32 reg, u32 * out1, u32 * result)
 212 {
 213         u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
 214         u32 out[HCI_WORDS];
 215         acpi_status status = hci_raw(in, out);
 216         *out1 = out[2];
 217         *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
 218         return status;
 219 }
 220
 221 static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
 222 static struct backlight_device *toshiba_backlight_device;
 223 static int force_fan;
 224 static int last_key_event;
 225 static int key_event_valid;
 226
 227 typedef struct _ProcItem {
 228         const char *name;
 229         char *(*read_func) (char *);
 230         unsigned long (*write_func) (const char *, unsigned long);
 231 } ProcItem;
 232
 233 /* proc file handlers
 234  */
 235
 236 static int
 237 dispatch_read(char *page, char **start, off_t off, int count, int *eof,
 238               ProcItem * item)
 239 {
 240         char *p = page;
 241         int len;
 242
 243         if (off == 0)
 244                 p = item->read_func(p);
 245
 246         /* ISSUE: I don't understand this code */
 247         len = (p - page);
 248         if (len <= off + count)
 249                 *eof = 1;
 250         *start = page + off;
 251         len -= off;
 252         if (len > count)
 253                 len = count;
 254         if (len < 0)
 255                 len = 0;
 256         return len;
 257 }
 258
 259 static int
 260 dispatch_write(struct file *file, const char __user * buffer,
 261                unsigned long count, ProcItem * item)
 262 {
 263         int result;
 264         char *tmp_buffer;
 265
 266         /* Arg buffer points to userspace memory, which can't be accessed
 267          * directly.  Since we're making a copy, zero-terminate the
 268          * destination so that sscanf can be used on it safely.
 269          */
 270         tmp_buffer = kmalloc(count + 1, GFP_KERNEL);
 271         if (!tmp_buffer)
 272                 return -ENOMEM;
 273
 274         if (copy_from_user(tmp_buffer, buffer, count)) {
 275                 result = -EFAULT;
 276         } else {
 277                 tmp_buffer[count] = 0;
 278                 result = item->write_func(tmp_buffer, count);
 279         }
 280         kfree(tmp_buffer);
 281         return result;
 282 }
 283
 284 static int get_lcd(struct backlight_device *bd)
 285 {
 286         u32 hci_result;
 287         u32 value;
 288
 289         hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
 290         if (hci_result == HCI_SUCCESS) {
 291                 return (value >> HCI_LCD_BRIGHTNESS_SHIFT);
 292         } else
 293                 return -EFAULT;
 294 }
 295
 296 static char *read_lcd(char *p)
 297 {
 298         int value = get_lcd(NULL);
 299
 300         if (value >= 0) {
 301                 p += sprintf(p, "brightness:              %d\n", value);
 302                 p += sprintf(p, "brightness_levels:       %d\n",
 303                              HCI_LCD_BRIGHTNESS_LEVELS);
 304         } else {
 305                 printk(MY_ERR "Error reading LCD brightness\n");
 306         }
 307
 308         return p;
 309 }
 310
 311 static int set_lcd(int value)
 312 {
 313         u32 hci_result;
 314
 315         value = value << HCI_LCD_BRIGHTNESS_SHIFT;
 316         hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
 317         if (hci_result != HCI_SUCCESS)
 318                 return -EFAULT;
 319
 320         return 0;
 321 }
 322
 323 static int set_lcd_status(struct backlight_device *bd)
 324 {
 325         return set_lcd(bd->props.brightness);
 326 }
 327
 328 static unsigned long write_lcd(const char *buffer, unsigned long count)
 329 {
 330         int value;
 331         int ret;
 332
 333         if (sscanf(buffer, " brightness : %i", &value) == 1 &&
 334             value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
 335                 ret = set_lcd(value);
 336                 if (ret == 0)
 337                         ret = count;
 338         } else {
 339                 ret = -EINVAL;
 340         }
 341         return ret;
 342 }
 343
 344 static char *read_video(char *p)
 345 {
 346         u32 hci_result;
 347         u32 value;
 348
 349         hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
 350         if (hci_result == HCI_SUCCESS) {
 351                 int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
 352                 int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
 353                 int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
 354                 p += sprintf(p, "lcd_out:                 %d\n", is_lcd);
 355                 p += sprintf(p, "crt_out:                 %d\n", is_crt);
 356                 p += sprintf(p, "tv_out:                  %d\n", is_tv);
 357         } else {
 358                 printk(MY_ERR "Error reading video out status\n");
 359         }
 360
 361         return p;
 362 }
 363
 364 static unsigned long write_video(const char *buffer, unsigned long count)
 365 {
 366         int value;
 367         int remain = count;
 368         int lcd_out = -1;
 369         int crt_out = -1;
 370         int tv_out = -1;
 371         u32 hci_result;
 372         u32 video_out;
 373
 374         /* scan expression.  Multiple expressions may be delimited with ;
 375          *
 376          *  NOTE: to keep scanning simple, invalid fields are ignored
 377          */
 378         while (remain) {
 379                 if (sscanf(buffer, " lcd_out : %i", &value) == 1)
 380                         lcd_out = value & 1;
 381                 else if (sscanf(buffer, " crt_out : %i", &value) == 1)
 382                         crt_out = value & 1;
 383                 else if (sscanf(buffer, " tv_out : %i", &value) == 1)
 384                         tv_out = value & 1;
 385                 /* advance to one character past the next ; */
 386                 do {
 387                         ++buffer;
 388                         --remain;
 389                 }
 390                 while (remain && *(buffer - 1) != ';');
 391         }
 392
 393         hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
 394         if (hci_result == HCI_SUCCESS) {
 395                 int new_video_out = video_out;
 396                 if (lcd_out != -1)
 397                         _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
 398                 if (crt_out != -1)
 399                         _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
 400                 if (tv_out != -1)
 401                         _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
 402                 /* To avoid unnecessary video disruption, only write the new
 403                  * video setting if something changed. */
 404                 if (new_video_out != video_out)
 405                         write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
 406         } else {
 407                 return -EFAULT;
 408         }
 409
 410         return count;
 411 }
 412
 413 static char *read_fan(char *p)
 414 {
 415         u32 hci_result;
 416         u32 value;
 417
 418         hci_read1(HCI_FAN, &value, &hci_result);
 419         if (hci_result == HCI_SUCCESS) {
 420                 p += sprintf(p, "running:                 %d\n", (value > 0));
 421                 p += sprintf(p, "force_on:                %d\n", force_fan);
 422         } else {
 423                 printk(MY_ERR "Error reading fan status\n");
 424         }
 425
 426         return p;
 427 }
 428
 429 static unsigned long write_fan(const char *buffer, unsigned long count)
 430 {
 431         int value;
 432         u32 hci_result;
 433
 434         if (sscanf(buffer, " force_on : %i", &value) == 1 &&
 435             value >= 0 && value <= 1) {
 436                 hci_write1(HCI_FAN, value, &hci_result);
 437                 if (hci_result != HCI_SUCCESS)
 438                         return -EFAULT;
 439                 else
 440                         force_fan = value;
 441         } else {
 442                 return -EINVAL;
 443         }
 444
 445         return count;
 446 }
 447
 448 static char *read_keys(char *p)
 449 {
 450         u32 hci_result;
 451         u32 value;
 452
 453         if (!key_event_valid) {
 454                 hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
 455                 if (hci_result == HCI_SUCCESS) {
 456                         key_event_valid = 1;
 457                         last_key_event = value;
 458                 } else if (hci_result == HCI_EMPTY) {
 459                         /* better luck next time */
 460                 } else if (hci_result == HCI_NOT_SUPPORTED) {
 461                         /* This is a workaround for an unresolved issue on
 462                          * some machines where system events sporadically
 463                          * become disabled. */
 464                         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 465                         printk(MY_NOTICE "Re-enabled hotkeys\n");
 466                 } else {
 467                         printk(MY_ERR "Error reading hotkey status\n");
 468                         goto end;
 469                 }
 470         }
 471
 472         p += sprintf(p, "hotkey_ready:            %d\n", key_event_valid);
 473         p += sprintf(p, "hotkey:                  0x%04x\n", last_key_event);
 474
 475       end:
 476         return p;
 477 }
 478
 479 static unsigned long write_keys(const char *buffer, unsigned long count)
 480 {
 481         int value;
 482
 483         if (sscanf(buffer, " hotkey_ready : %i", &value) == 1 && value == 0) {
 484                 key_event_valid = 0;
 485         } else {
 486                 return -EINVAL;
 487         }
 488
 489         return count;
 490 }
 491
 492 static char *read_version(char *p)
 493 {
 494         p += sprintf(p, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
 495         p += sprintf(p, "proc_interface:          %d\n",
 496                      PROC_INTERFACE_VERSION);
 497         return p;
 498 }
 499
 500 /* proc and module init
 501  */
 502
 503 #define PROC_TOSHIBA            "toshiba"
 504
 505 static ProcItem proc_items[] = {
 506         {"lcd", read_lcd, write_lcd},
 507         {"video", read_video, write_video},
 508         {"fan", read_fan, write_fan},
 509         {"keys", read_keys, write_keys},
 510         {"version", read_version, NULL},
 511         {NULL}
 512 };
 513
 514 static acpi_status __init add_device(void)
 515 {
 516         struct proc_dir_entry *proc;
 517         ProcItem *item;
 518
 519         for (item = proc_items; item->name; ++item) {
 520                 proc = create_proc_read_entry(item->name,
 521                                               S_IFREG | S_IRUGO | S_IWUSR,
 522                                               toshiba_proc_dir,
 523                                               (read_proc_t *) dispatch_read,
 524                                               item);
 525                 if (proc)
 526                         proc->owner = THIS_MODULE;
 527                 if (proc && item->write_func)
 528                         proc->write_proc = (write_proc_t *) dispatch_write;
 529         }
 530
 531         return AE_OK;
 532 }
 533
 534 static acpi_status remove_device(void)
 535 {
 536         ProcItem *item;
 537
 538         for (item = proc_items; item->name; ++item)
 539                 remove_proc_entry(item->name, toshiba_proc_dir);
 540         return AE_OK;
 541 }
 542
 543 static struct backlight_ops toshiba_backlight_data = {
 544         .get_brightness = get_lcd,
 545         .update_status  = set_lcd_status,
 546 };
 547
 548 static void toshiba_acpi_exit(void)
 549 {
 550         if (toshiba_backlight_device)
 551                 backlight_device_unregister(toshiba_backlight_device);
 552
 553         remove_device();
 554
 555         if (toshiba_proc_dir)
 556                 remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 557
 558         return;
 559 }
 560
 561 static int __init toshiba_acpi_init(void)
 562 {
 563         acpi_status status = AE_OK;
 564         u32 hci_result;
 565
 566         if (acpi_disabled)
 567                 return -ENODEV;
 568
 569         /* simple device detection: look for HCI method */
 570         if (is_valid_acpi_path(METHOD_HCI_1))
 571                 method_hci = METHOD_HCI_1;
 572         else if (is_valid_acpi_path(METHOD_HCI_2))
 573                 method_hci = METHOD_HCI_2;
 574         else
 575                 return -ENODEV;
 576
 577         printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
 578                TOSHIBA_ACPI_VERSION);
 579         printk(MY_INFO "    HCI method: %s\n", method_hci);
 580
 581         force_fan = 0;
 582         key_event_valid = 0;
 583
 584         /* enable event fifo */
 585         hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
 586
 587         toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
 588         if (!toshiba_proc_dir) {
 589                 status = AE_ERROR;
 590         } else {
 591                 toshiba_proc_dir->owner = THIS_MODULE;
 592                 status = add_device();
 593                 if (ACPI_FAILURE(status))
 594                         remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);
 595         }
 596
 597         toshiba_backlight_device = backlight_device_register("toshiba",NULL,
 598                                                 NULL,
 599                                                 &toshiba_backlight_data);
 600         if (IS_ERR(toshiba_backlight_device)) {
 601                 int ret = PTR_ERR(toshiba_backlight_device);
 602
 603                 printk(KERN_ERR "Could not register toshiba backlight device\n");
 604                 toshiba_backlight_device = NULL;
 605                 toshiba_acpi_exit();
 606                 return ret;
 607         }
 608         toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
 609
 610         return (ACPI_SUCCESS(status)) ? 0 : -ENODEV;
 611 }
 612
 613 module_init(toshiba_acpi_init);
 614 module_exit(toshiba_acpi_exit);