1 /* 2 * Chassis LCD/LED driver for HP-PARISC workstations 3 * 4 * (c) Copyright 2000 Red Hat Software 5 * (c) Copyright 2000 Helge Deller <hdeller@redhat.com> 6 * (c) Copyright 2001-2004 Helge Deller <deller@gmx.de> 7 * (c) Copyright 2001 Randolph Chung <tausq@debian.org> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * TODO: 15 * - speed-up calculations with inlined assembler 16 * - interface to write to second row of LCD from /proc (if technically possible) 17 * 18 * Changes: 19 * - Audit copy_from_user in led_proc_write. 20 * Daniele Bellucci <bellucda@tiscali.it> 21 */ 22 23 #include <linux/config.h> 24 #include <linux/module.h> 25 #include <linux/stddef.h> /* for offsetof() */ 26 #include <linux/init.h> 27 #include <linux/types.h> 28 #include <linux/ioport.h> 29 #include <linux/utsname.h> 30 #include <linux/delay.h> 31 #include <linux/netdevice.h> 32 #include <linux/inetdevice.h> 33 #include <linux/in.h> 34 #include <linux/interrupt.h> 35 #include <linux/kernel_stat.h> 36 #include <linux/reboot.h> 37 #include <linux/proc_fs.h> 38 #include <linux/ctype.h> 39 #include <linux/blkdev.h> 40 #include <asm/io.h> 41 #include <asm/processor.h> 42 #include <asm/hardware.h> 43 #include <asm/param.h> /* HZ */ 44 #include <asm/led.h> 45 #include <asm/pdc.h> 46 #include <asm/uaccess.h> 47 48 /* The control of the LEDs and LCDs on PARISC-machines have to be done 49 completely in software. The necessary calculations are done in a tasklet 50 which is scheduled at every timer interrupt and since the calculations 51 may consume relatively much CPU-time some of the calculations can be 52 turned off with the following variables (controlled via procfs) */ 53 54 static int led_type = -1; 55 static int led_heartbeat = 1; 56 static int led_diskio = 1; 57 static int led_lanrxtx = 1; 58 static char lcd_text[32]; 59 static char lcd_text_default[32]; 60 61 #if 0 62 #define DPRINTK(x) printk x 63 #else 64 #define DPRINTK(x) 65 #endif 66 67 68 struct lcd_block { 69 unsigned char command; /* stores the command byte */ 70 unsigned char on; /* value for turning LED on */ 71 unsigned char off; /* value for turning LED off */ 72 }; 73 74 /* Structure returned by PDC_RETURN_CHASSIS_INFO */ 75 /* NOTE: we use unsigned long:16 two times, since the following member 76 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ 77 struct pdc_chassis_lcd_info_ret_block { 78 unsigned long model:16; /* DISPLAY_MODEL_XXXX */ 79 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ 80 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ 81 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ 82 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ 83 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ 84 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ 85 unsigned char act_enable; /* 0 = no activity (LCD only) */ 86 struct lcd_block heartbeat; 87 struct lcd_block disk_io; 88 struct lcd_block lan_rcv; 89 struct lcd_block lan_tx; 90 char _pad; 91 }; 92 93 94 /* LCD_CMD and LCD_DATA for KittyHawk machines */ 95 #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ 96 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) 97 98 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's 99 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ 100 static struct pdc_chassis_lcd_info_ret_block 101 lcd_info __attribute__((aligned(8))) = 102 { 103 .model = DISPLAY_MODEL_LCD, 104 .lcd_width = 16, 105 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, 106 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, 107 .min_cmd_delay = 40, 108 .reset_cmd1 = 0x80, 109 .reset_cmd2 = 0xc0, 110 }; 111 112 113 /* direct access to some of the lcd_info variables */ 114 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr 115 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr 116 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ 117 118 119 /* ptr to LCD/LED-specific function */ 120 static void (*led_func_ptr) (unsigned char); 121 122 #define LED_HASLCD 1 123 #define LED_NOLCD 0 124 #ifdef CONFIG_PROC_FS 125 static int led_proc_read(char *page, char **start, off_t off, int count, 126 int *eof, void *data) 127 { 128 char *out = page; 129 int len; 130 131 switch ((long)data) 132 { 133 case LED_NOLCD: 134 out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); 135 out += sprintf(out, "Disk IO: %d\n", led_diskio); 136 out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); 137 break; 138 case LED_HASLCD: 139 out += sprintf(out, "%s\n", lcd_text); 140 break; 141 default: 142 *eof = 1; 143 return 0; 144 } 145 146 len = out - page - off; 147 if (len < count) { 148 *eof = 1; 149 if (len <= 0) return 0; 150 } else { 151 len = count; 152 } 153 *start = page + off; 154 return len; 155 } 156 157 static int led_proc_write(struct file *file, const char *buf, 158 unsigned long count, void *data) 159 { 160 char *cur, lbuf[count + 1]; 161 int d; 162 163 if (!capable(CAP_SYS_ADMIN)) 164 return -EACCES; 165 166 memset(lbuf, 0, count + 1); 167 168 if (copy_from_user(lbuf, buf, count)) 169 return -EFAULT; 170 171 cur = lbuf; 172 173 /* skip initial spaces */ 174 while (*cur && isspace(*cur)) 175 { 176 cur++; 177 } 178 179 switch ((long)data) 180 { 181 case LED_NOLCD: 182 d = *cur++ - '0'; 183 if (d != 0 && d != 1) goto parse_error; 184 led_heartbeat = d; 185 186 if (*cur++ != ' ') goto parse_error; 187 188 d = *cur++ - '0'; 189 if (d != 0 && d != 1) goto parse_error; 190 led_diskio = d; 191 192 if (*cur++ != ' ') goto parse_error; 193 194 d = *cur++ - '0'; 195 if (d != 0 && d != 1) goto parse_error; 196 led_lanrxtx = d; 197 198 break; 199 case LED_HASLCD: 200 if (*cur && cur[strlen(cur)-1] == '\n') 201 cur[strlen(cur)-1] = 0; 202 if (*cur == 0) 203 cur = lcd_text_default; 204 lcd_print(cur); 205 break; 206 default: 207 return 0; 208 } 209 210 return count; 211 212 parse_error: 213 if ((long)data == LED_NOLCD) 214 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 215 return -EINVAL; 216 } 217 218 static int __init led_create_procfs(void) 219 { 220 struct proc_dir_entry *proc_pdc_root = NULL; 221 struct proc_dir_entry *ent; 222 223 if (led_type == -1) return -1; 224 225 proc_pdc_root = proc_mkdir("pdc", 0); 226 if (!proc_pdc_root) return -1; 227 proc_pdc_root->owner = THIS_MODULE; 228 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 229 if (!ent) return -1; 230 ent->nlink = 1; 231 ent->data = (void *)LED_NOLCD; /* LED */ 232 ent->read_proc = led_proc_read; 233 ent->write_proc = led_proc_write; 234 ent->owner = THIS_MODULE; 235 236 if (led_type == LED_HASLCD) 237 { 238 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 239 if (!ent) return -1; 240 ent->nlink = 1; 241 ent->data = (void *)LED_HASLCD; /* LCD */ 242 ent->read_proc = led_proc_read; 243 ent->write_proc = led_proc_write; 244 ent->owner = THIS_MODULE; 245 } 246 247 return 0; 248 } 249 #endif 250 251 /* 252 ** 253 ** led_ASP_driver() 254 ** 255 */ 256 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 257 #define LED_STROBE 0x02 /* strobe to clock data */ 258 static void led_ASP_driver(unsigned char leds) 259 { 260 int i; 261 262 leds = ~leds; 263 for (i = 0; i < 8; i++) { 264 unsigned char value; 265 value = (leds & 0x80) >> 7; 266 gsc_writeb( value, LED_DATA_REG ); 267 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 268 leds <<= 1; 269 } 270 } 271 272 273 /* 274 ** 275 ** led_LASI_driver() 276 ** 277 */ 278 static void led_LASI_driver(unsigned char leds) 279 { 280 leds = ~leds; 281 gsc_writeb( leds, LED_DATA_REG ); 282 } 283 284 285 /* 286 ** 287 ** led_LCD_driver() 288 ** 289 ** The logic of the LCD driver is, that we write at every scheduled call 290 ** only to one of LCD_CMD_REG _or_ LCD_DATA_REG - registers. 291 ** That way we don't need to let this tasklet busywait for min_cmd_delay 292 ** milliseconds. 293 ** 294 ** TODO: check the value of "min_cmd_delay" against the value of HZ. 295 ** 296 */ 297 static void led_LCD_driver(unsigned char leds) 298 { 299 static int last_index; /* 0:heartbeat, 1:disk, 2:lan_in, 3:lan_out */ 300 static int last_was_cmd;/* 0: CMD was written last, 1: DATA was last */ 301 struct lcd_block *block_ptr; 302 int value; 303 304 switch (last_index) { 305 case 0: block_ptr = &lcd_info.heartbeat; 306 value = leds & LED_HEARTBEAT; 307 break; 308 case 1: block_ptr = &lcd_info.disk_io; 309 value = leds & LED_DISK_IO; 310 break; 311 case 2: block_ptr = &lcd_info.lan_rcv; 312 value = leds & LED_LAN_RCV; 313 break; 314 case 3: block_ptr = &lcd_info.lan_tx; 315 value = leds & LED_LAN_TX; 316 break; 317 default: /* should never happen: */ 318 return; 319 } 320 321 if (last_was_cmd) { 322 /* write the value to the LCD data port */ 323 gsc_writeb( value ? block_ptr->on : block_ptr->off, LCD_DATA_REG ); 324 } else { 325 /* write the command-byte to the LCD command register */ 326 gsc_writeb( block_ptr->command, LCD_CMD_REG ); 327 } 328 329 /* now update the vars for the next interrupt iteration */ 330 if (++last_was_cmd == 2) { /* switch between cmd & data */ 331 last_was_cmd = 0; 332 if (++last_index == 4) 333 last_index = 0; /* switch back to heartbeat index */ 334 } 335 } 336 337 338 /* 339 ** 340 ** led_get_net_activity() 341 ** 342 ** calculate if there was TX- or RX-troughput on the network interfaces 343 ** (analog to dev_get_info() from net/core/dev.c) 344 ** 345 */ 346 static __inline__ int led_get_net_activity(void) 347 { 348 #ifndef CONFIG_NET 349 return 0; 350 #else 351 static unsigned long rx_total_last, tx_total_last; 352 unsigned long rx_total, tx_total; 353 struct net_device *dev; 354 int retval; 355 356 rx_total = tx_total = 0; 357 358 /* we are running as tasklet, so locking dev_base 359 * for reading should be OK */ 360 read_lock(&dev_base_lock); 361 for (dev = dev_base; dev; dev = dev->next) { 362 struct net_device_stats *stats; 363 struct in_device *in_dev = __in_dev_get(dev); 364 if (!in_dev || !in_dev->ifa_list) 365 continue; 366 if (LOOPBACK(in_dev->ifa_list->ifa_local)) 367 continue; 368 if (!dev->get_stats) 369 continue; 370 stats = dev->get_stats(dev); 371 rx_total += stats->rx_packets; 372 tx_total += stats->tx_packets; 373 } 374 read_unlock(&dev_base_lock); 375 376 retval = 0; 377 378 if (rx_total != rx_total_last) { 379 rx_total_last = rx_total; 380 retval |= LED_LAN_RCV; 381 } 382 383 if (tx_total != tx_total_last) { 384 tx_total_last = tx_total; 385 retval |= LED_LAN_TX; 386 } 387 388 return retval; 389 #endif 390 } 391 392 393 /* 394 ** 395 ** led_get_diskio_activity() 396 ** 397 ** calculate if there was disk-io in the system 398 ** 399 */ 400 static __inline__ int led_get_diskio_activity(void) 401 { 402 static unsigned long last_pgpgin, last_pgpgout; 403 struct page_state pgstat; 404 int changed; 405 406 get_full_page_state(&pgstat); /* get no of sectors in & out */ 407 408 /* Just use a very simple calculation here. Do not care about overflow, 409 since we only want to know if there was activity or not. */ 410 changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout); 411 last_pgpgin = pgstat.pgpgin; 412 last_pgpgout = pgstat.pgpgout; 413 414 return (changed ? LED_DISK_IO : 0); 415 } 416 417 418 419 /* 420 ** led_tasklet_func() 421 ** 422 ** is scheduled at every timer interrupt from time.c and 423 ** updates the chassis LCD/LED 424 425 TODO: 426 - display load average (older machines like 715/64 have 4 "free" LED's for that) 427 - optimizations 428 */ 429 430 #define HEARTBEAT_LEN (HZ*6/100) 431 #define HEARTBEAT_2ND_RANGE_START (HZ*22/100) 432 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 433 434 #define NORMALIZED_COUNT(count) (count/(HZ/100)) 435 436 static void led_tasklet_func(unsigned long unused) 437 { 438 static unsigned char lastleds; 439 unsigned char currentleds; /* stores current value of the LEDs */ 440 static unsigned long count; /* static incremented value, not wrapped */ 441 static unsigned long count_HZ; /* counter in range 0..HZ */ 442 443 /* exit if not initialized */ 444 if (!led_func_ptr) 445 return; 446 447 /* increment the local counters */ 448 ++count; 449 if (++count_HZ == HZ) 450 count_HZ = 0; 451 452 currentleds = lastleds; 453 454 if (led_heartbeat) 455 { 456 /* flash heartbeat-LED like a real heart (2 x short then a long delay) */ 457 if (count_HZ<HEARTBEAT_LEN || 458 (count_HZ>=HEARTBEAT_2ND_RANGE_START && count_HZ<HEARTBEAT_2ND_RANGE_END)) 459 currentleds |= LED_HEARTBEAT; 460 else 461 currentleds &= ~LED_HEARTBEAT; 462 } 463 464 /* look for network activity and flash LEDs respectively */ 465 if (led_lanrxtx && ((NORMALIZED_COUNT(count)+(8/2)) & 7) == 0) 466 { 467 currentleds &= ~(LED_LAN_RCV | LED_LAN_TX); 468 currentleds |= led_get_net_activity(); 469 } 470 471 /* avoid to calculate diskio-stats at same irq as netio-stats */ 472 if (led_diskio && (NORMALIZED_COUNT(count) & 7) == 0) 473 { 474 currentleds &= ~LED_DISK_IO; 475 currentleds |= led_get_diskio_activity(); 476 } 477 478 /* blink all LEDs twice a second if we got an Oops (HPMC) */ 479 if (oops_in_progress) { 480 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; 481 } 482 483 /* update the LCD/LEDs */ 484 if (currentleds != lastleds) { 485 led_func_ptr(currentleds); 486 lastleds = currentleds; 487 } 488 } 489 490 /* main led tasklet struct (scheduled from time.c) */ 491 DECLARE_TASKLET_DISABLED(led_tasklet, led_tasklet_func, 0); 492 493 494 /* 495 ** led_halt() 496 ** 497 ** called by the reboot notifier chain at shutdown and stops all 498 ** LED/LCD activities. 499 ** 500 */ 501 502 static int led_halt(struct notifier_block *, unsigned long, void *); 503 504 static struct notifier_block led_notifier = { 505 .notifier_call = led_halt, 506 }; 507 508 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 509 { 510 char *txt; 511 512 switch (event) { 513 case SYS_RESTART: txt = "SYSTEM RESTART"; 514 break; 515 case SYS_HALT: txt = "SYSTEM HALT"; 516 break; 517 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 518 break; 519 default: return NOTIFY_DONE; 520 } 521 522 /* completely stop the LED/LCD tasklet */ 523 tasklet_disable(&led_tasklet); 524 525 if (lcd_info.model == DISPLAY_MODEL_LCD) 526 lcd_print(txt); 527 else 528 if (led_func_ptr) 529 led_func_ptr(0xff); /* turn all LEDs ON */ 530 531 unregister_reboot_notifier(&led_notifier); 532 return NOTIFY_OK; 533 } 534 535 /* 536 ** register_led_driver() 537 ** 538 ** registers an external LED or LCD for usage by this driver. 539 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 540 ** 541 */ 542 543 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 544 { 545 static int initialized; 546 547 if (initialized || !data_reg) 548 return 1; 549 550 lcd_info.model = model; /* store the values */ 551 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 552 553 switch (lcd_info.model) { 554 case DISPLAY_MODEL_LCD: 555 LCD_DATA_REG = data_reg; 556 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 557 LCD_CMD_REG , LCD_DATA_REG); 558 led_func_ptr = led_LCD_driver; 559 lcd_print( lcd_text_default ); 560 led_type = LED_HASLCD; 561 break; 562 563 case DISPLAY_MODEL_LASI: 564 LED_DATA_REG = data_reg; 565 led_func_ptr = led_LASI_driver; 566 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 567 led_type = LED_NOLCD; 568 break; 569 570 case DISPLAY_MODEL_OLD_ASP: 571 LED_DATA_REG = data_reg; 572 led_func_ptr = led_ASP_driver; 573 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 574 LED_DATA_REG); 575 led_type = LED_NOLCD; 576 break; 577 578 default: 579 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 580 __FUNCTION__, lcd_info.model); 581 return 1; 582 } 583 584 /* mark the LCD/LED driver now as initialized and 585 * register to the reboot notifier chain */ 586 initialized++; 587 register_reboot_notifier(&led_notifier); 588 589 /* start the led tasklet for the first time */ 590 tasklet_enable(&led_tasklet); 591 592 return 0; 593 } 594 595 /* 596 ** register_led_regions() 597 ** 598 ** register_led_regions() registers the LCD/LED regions for /procfs. 599 ** At bootup - where the initialisation of the LCD/LED normally happens - 600 ** not all internal structures of request_region() are properly set up, 601 ** so that we delay the led-registration until after busdevices_init() 602 ** has been executed. 603 ** 604 */ 605 606 void __init register_led_regions(void) 607 { 608 switch (lcd_info.model) { 609 case DISPLAY_MODEL_LCD: 610 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 611 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 612 break; 613 case DISPLAY_MODEL_LASI: 614 case DISPLAY_MODEL_OLD_ASP: 615 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 616 break; 617 } 618 } 619 620 621 /* 622 ** 623 ** lcd_print() 624 ** 625 ** Displays the given string on the LCD-Display of newer machines. 626 ** lcd_print() disables the timer-based led tasklet during its 627 ** execution and enables it afterwards again. 628 ** 629 */ 630 int lcd_print( char *str ) 631 { 632 int i; 633 634 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 635 return 0; 636 637 /* temporarily disable the led tasklet */ 638 tasklet_disable(&led_tasklet); 639 640 /* copy display string to buffer for procfs */ 641 strlcpy(lcd_text, str, sizeof(lcd_text)); 642 643 /* Set LCD Cursor to 1st character */ 644 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 645 udelay(lcd_info.min_cmd_delay); 646 647 /* Print the string */ 648 for (i=0; i < lcd_info.lcd_width; i++) { 649 if (str && *str) 650 gsc_writeb(*str++, LCD_DATA_REG); 651 else 652 gsc_writeb(' ', LCD_DATA_REG); 653 udelay(lcd_info.min_cmd_delay); 654 } 655 656 /* re-enable the led tasklet */ 657 tasklet_enable(&led_tasklet); 658 659 return lcd_info.lcd_width; 660 } 661 662 /* 663 ** led_init() 664 ** 665 ** led_init() is called very early in the bootup-process from setup.c 666 ** and asks the PDC for an usable chassis LCD or LED. 667 ** If the PDC doesn't return any info, then the LED 668 ** is detected by lasi.c or asp.c and registered with the 669 ** above functions lasi_led_init() or asp_led_init(). 670 ** KittyHawk machines have often a buggy PDC, so that 671 ** we explicitly check for those machines here. 672 */ 673 674 int __init led_init(void) 675 { 676 struct pdc_chassis_info chassis_info; 677 int ret; 678 679 snprintf(lcd_text_default, sizeof(lcd_text_default), 680 "Linux %s", system_utsname.release); 681 682 /* Work around the buggy PDC of KittyHawk-machines */ 683 switch (CPU_HVERSION) { 684 case 0x580: /* KittyHawk DC2-100 (K100) */ 685 case 0x581: /* KittyHawk DC3-120 (K210) */ 686 case 0x582: /* KittyHawk DC3 100 (K400) */ 687 case 0x583: /* KittyHawk DC3 120 (K410) */ 688 case 0x58B: /* KittyHawk DC2 100 (K200) */ 689 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 690 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 691 goto found; /* use the preinitialized values of lcd_info */ 692 } 693 694 /* initialize the struct, so that we can check for valid return values */ 695 lcd_info.model = DISPLAY_MODEL_NONE; 696 chassis_info.actcnt = chassis_info.maxcnt = 0; 697 698 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 699 if (ret == PDC_OK) { 700 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 701 "lcd_width=%d, cmd_delay=%u,\n" 702 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 703 __FILE__, lcd_info.model, 704 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 705 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 706 lcd_info.lcd_width, lcd_info.min_cmd_delay, 707 __FILE__, sizeof(lcd_info), 708 chassis_info.actcnt, chassis_info.maxcnt)); 709 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 710 __FILE__, lcd_info.lcd_cmd_reg_addr, 711 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 712 lcd_info.reset_cmd2, lcd_info.act_enable )); 713 714 /* check the results. Some machines have a buggy PDC */ 715 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 716 goto not_found; 717 718 switch (lcd_info.model) { 719 case DISPLAY_MODEL_LCD: /* LCD display */ 720 if (chassis_info.actcnt < 721 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 722 goto not_found; 723 if (!lcd_info.act_enable) { 724 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 725 goto not_found; 726 } 727 break; 728 729 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 730 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 731 goto not_found; 732 733 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 734 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 735 goto not_found; 736 break; 737 738 default: 739 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 740 lcd_info.model); 741 goto not_found; 742 } /* switch() */ 743 744 found: 745 /* register the LCD/LED driver */ 746 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 747 return 0; 748 749 } else { /* if() */ 750 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 751 } 752 753 not_found: 754 lcd_info.model = DISPLAY_MODEL_NONE; 755 return 1; 756 } 757 758 #ifdef CONFIG_PROC_FS 759 module_init(led_create_procfs) 760 #endif 761