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 2001-2005 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 * - Switch from using a tasklet to a work queue, so the led_LCD_driver 22 * can sleep. 23 * David Pye <dmp@davidmpye.dyndns.org> 24 */ 25 26 #include <linux/config.h> 27 #include <linux/module.h> 28 #include <linux/stddef.h> /* for offsetof() */ 29 #include <linux/init.h> 30 #include <linux/types.h> 31 #include <linux/ioport.h> 32 #include <linux/utsname.h> 33 #include <linux/capability.h> 34 #include <linux/delay.h> 35 #include <linux/netdevice.h> 36 #include <linux/inetdevice.h> 37 #include <linux/in.h> 38 #include <linux/interrupt.h> 39 #include <linux/kernel_stat.h> 40 #include <linux/reboot.h> 41 #include <linux/proc_fs.h> 42 #include <linux/ctype.h> 43 #include <linux/blkdev.h> 44 #include <linux/workqueue.h> 45 #include <linux/rcupdate.h> 46 #include <asm/io.h> 47 #include <asm/processor.h> 48 #include <asm/hardware.h> 49 #include <asm/param.h> /* HZ */ 50 #include <asm/led.h> 51 #include <asm/pdc.h> 52 #include <asm/uaccess.h> 53 54 /* The control of the LEDs and LCDs on PARISC-machines have to be done 55 completely in software. The necessary calculations are done in a work queue 56 task which is scheduled regularly, and since the calculations may consume a 57 relatively large amount of CPU time, some of the calculations can be 58 turned off with the following variables (controlled via procfs) */ 59 60 static int led_type __read_mostly = -1; 61 static unsigned char lastleds; /* LED state from most recent update */ 62 static unsigned int led_heartbeat __read_mostly = 1; 63 static unsigned int led_diskio __read_mostly = 1; 64 static unsigned int led_lanrxtx __read_mostly = 1; 65 static char lcd_text[32] __read_mostly; 66 static char lcd_text_default[32] __read_mostly; 67 68 69 static struct workqueue_struct *led_wq; 70 static void led_work_func(void *); 71 static DECLARE_WORK(led_task, led_work_func, NULL); 72 73 #if 0 74 #define DPRINTK(x) printk x 75 #else 76 #define DPRINTK(x) 77 #endif 78 79 struct lcd_block { 80 unsigned char command; /* stores the command byte */ 81 unsigned char on; /* value for turning LED on */ 82 unsigned char off; /* value for turning LED off */ 83 }; 84 85 /* Structure returned by PDC_RETURN_CHASSIS_INFO */ 86 /* NOTE: we use unsigned long:16 two times, since the following member 87 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ 88 struct pdc_chassis_lcd_info_ret_block { 89 unsigned long model:16; /* DISPLAY_MODEL_XXXX */ 90 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ 91 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ 92 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ 93 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ 94 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ 95 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ 96 unsigned char act_enable; /* 0 = no activity (LCD only) */ 97 struct lcd_block heartbeat; 98 struct lcd_block disk_io; 99 struct lcd_block lan_rcv; 100 struct lcd_block lan_tx; 101 char _pad; 102 }; 103 104 105 /* LCD_CMD and LCD_DATA for KittyHawk machines */ 106 #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ 107 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) 108 109 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's 110 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ 111 static struct pdc_chassis_lcd_info_ret_block 112 lcd_info __attribute__((aligned(8))) __read_mostly = 113 { 114 .model = DISPLAY_MODEL_LCD, 115 .lcd_width = 16, 116 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, 117 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, 118 .min_cmd_delay = 40, 119 .reset_cmd1 = 0x80, 120 .reset_cmd2 = 0xc0, 121 }; 122 123 124 /* direct access to some of the lcd_info variables */ 125 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr 126 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr 127 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ 128 129 #define LED_HASLCD 1 130 #define LED_NOLCD 0 131 132 /* The workqueue must be created at init-time */ 133 static int start_task(void) 134 { 135 /* Display the default text now */ 136 if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); 137 138 /* Create the work queue and queue the LED task */ 139 led_wq = create_singlethread_workqueue("led_wq"); 140 queue_work(led_wq, &led_task); 141 142 return 0; 143 } 144 145 device_initcall(start_task); 146 147 /* ptr to LCD/LED-specific function */ 148 static void (*led_func_ptr) (unsigned char) __read_mostly; 149 150 #ifdef CONFIG_PROC_FS 151 static int led_proc_read(char *page, char **start, off_t off, int count, 152 int *eof, void *data) 153 { 154 char *out = page; 155 int len; 156 157 switch ((long)data) 158 { 159 case LED_NOLCD: 160 out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); 161 out += sprintf(out, "Disk IO: %d\n", led_diskio); 162 out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); 163 break; 164 case LED_HASLCD: 165 out += sprintf(out, "%s\n", lcd_text); 166 break; 167 default: 168 *eof = 1; 169 return 0; 170 } 171 172 len = out - page - off; 173 if (len < count) { 174 *eof = 1; 175 if (len <= 0) return 0; 176 } else { 177 len = count; 178 } 179 *start = page + off; 180 return len; 181 } 182 183 static int led_proc_write(struct file *file, const char *buf, 184 unsigned long count, void *data) 185 { 186 char *cur, lbuf[count + 1]; 187 int d; 188 189 if (!capable(CAP_SYS_ADMIN)) 190 return -EACCES; 191 192 memset(lbuf, 0, count + 1); 193 194 if (copy_from_user(lbuf, buf, count)) 195 return -EFAULT; 196 197 cur = lbuf; 198 199 /* skip initial spaces */ 200 while (*cur && isspace(*cur)) 201 { 202 cur++; 203 } 204 205 switch ((long)data) 206 { 207 case LED_NOLCD: 208 d = *cur++ - '0'; 209 if (d != 0 && d != 1) goto parse_error; 210 led_heartbeat = d; 211 212 if (*cur++ != ' ') goto parse_error; 213 214 d = *cur++ - '0'; 215 if (d != 0 && d != 1) goto parse_error; 216 led_diskio = d; 217 218 if (*cur++ != ' ') goto parse_error; 219 220 d = *cur++ - '0'; 221 if (d != 0 && d != 1) goto parse_error; 222 led_lanrxtx = d; 223 224 break; 225 case LED_HASLCD: 226 if (*cur && cur[strlen(cur)-1] == '\n') 227 cur[strlen(cur)-1] = 0; 228 if (*cur == 0) 229 cur = lcd_text_default; 230 lcd_print(cur); 231 break; 232 default: 233 return 0; 234 } 235 236 return count; 237 238 parse_error: 239 if ((long)data == LED_NOLCD) 240 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 241 return -EINVAL; 242 } 243 244 static int __init led_create_procfs(void) 245 { 246 struct proc_dir_entry *proc_pdc_root = NULL; 247 struct proc_dir_entry *ent; 248 249 if (led_type == -1) return -1; 250 251 proc_pdc_root = proc_mkdir("pdc", 0); 252 if (!proc_pdc_root) return -1; 253 proc_pdc_root->owner = THIS_MODULE; 254 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 255 if (!ent) return -1; 256 ent->nlink = 1; 257 ent->data = (void *)LED_NOLCD; /* LED */ 258 ent->read_proc = led_proc_read; 259 ent->write_proc = led_proc_write; 260 ent->owner = THIS_MODULE; 261 262 if (led_type == LED_HASLCD) 263 { 264 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 265 if (!ent) return -1; 266 ent->nlink = 1; 267 ent->data = (void *)LED_HASLCD; /* LCD */ 268 ent->read_proc = led_proc_read; 269 ent->write_proc = led_proc_write; 270 ent->owner = THIS_MODULE; 271 } 272 273 return 0; 274 } 275 #endif 276 277 /* 278 ** 279 ** led_ASP_driver() 280 ** 281 */ 282 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 283 #define LED_STROBE 0x02 /* strobe to clock data */ 284 static void led_ASP_driver(unsigned char leds) 285 { 286 int i; 287 288 leds = ~leds; 289 for (i = 0; i < 8; i++) { 290 unsigned char value; 291 value = (leds & 0x80) >> 7; 292 gsc_writeb( value, LED_DATA_REG ); 293 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 294 leds <<= 1; 295 } 296 } 297 298 299 /* 300 ** 301 ** led_LASI_driver() 302 ** 303 */ 304 static void led_LASI_driver(unsigned char leds) 305 { 306 leds = ~leds; 307 gsc_writeb( leds, LED_DATA_REG ); 308 } 309 310 311 /* 312 ** 313 ** led_LCD_driver() 314 ** 315 */ 316 static void led_LCD_driver(unsigned char leds) 317 { 318 static int i; 319 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 320 LED_LAN_RCV, LED_LAN_TX }; 321 322 static struct lcd_block * blockp[4] = { 323 &lcd_info.heartbeat, 324 &lcd_info.disk_io, 325 &lcd_info.lan_rcv, 326 &lcd_info.lan_tx 327 }; 328 329 /* Convert min_cmd_delay to milliseconds */ 330 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 331 332 for (i=0; i<4; ++i) 333 { 334 if ((leds & mask[i]) != (lastleds & mask[i])) 335 { 336 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 337 msleep(msec_cmd_delay); 338 339 gsc_writeb( leds & mask[i] ? blockp[i]->on : 340 blockp[i]->off, LCD_DATA_REG ); 341 msleep(msec_cmd_delay); 342 } 343 } 344 } 345 346 347 /* 348 ** 349 ** led_get_net_activity() 350 ** 351 ** calculate if there was TX- or RX-throughput on the network interfaces 352 ** (analog to dev_get_info() from net/core/dev.c) 353 ** 354 */ 355 static __inline__ int led_get_net_activity(void) 356 { 357 #ifndef CONFIG_NET 358 return 0; 359 #else 360 static unsigned long rx_total_last, tx_total_last; 361 unsigned long rx_total, tx_total; 362 struct net_device *dev; 363 int retval; 364 365 rx_total = tx_total = 0; 366 367 /* we are running as a workqueue task, so locking dev_base 368 * for reading should be OK */ 369 read_lock(&dev_base_lock); 370 rcu_read_lock(); 371 for (dev = dev_base; dev; dev = dev->next) { 372 struct net_device_stats *stats; 373 struct in_device *in_dev = __in_dev_get_rcu(dev); 374 if (!in_dev || !in_dev->ifa_list) 375 continue; 376 if (LOOPBACK(in_dev->ifa_list->ifa_local)) 377 continue; 378 if (!dev->get_stats) 379 continue; 380 stats = dev->get_stats(dev); 381 rx_total += stats->rx_packets; 382 tx_total += stats->tx_packets; 383 } 384 rcu_read_unlock(); 385 read_unlock(&dev_base_lock); 386 387 retval = 0; 388 389 if (rx_total != rx_total_last) { 390 rx_total_last = rx_total; 391 retval |= LED_LAN_RCV; 392 } 393 394 if (tx_total != tx_total_last) { 395 tx_total_last = tx_total; 396 retval |= LED_LAN_TX; 397 } 398 399 return retval; 400 #endif 401 } 402 403 404 /* 405 ** 406 ** led_get_diskio_activity() 407 ** 408 ** calculate if there was disk-io in the system 409 ** 410 */ 411 static __inline__ int led_get_diskio_activity(void) 412 { 413 static unsigned long last_pgpgin, last_pgpgout; 414 struct page_state pgstat; 415 int changed; 416 417 get_full_page_state(&pgstat); /* get no of sectors in & out */ 418 419 /* Just use a very simple calculation here. Do not care about overflow, 420 since we only want to know if there was activity or not. */ 421 changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout); 422 last_pgpgin = pgstat.pgpgin; 423 last_pgpgout = pgstat.pgpgout; 424 425 return (changed ? LED_DISK_IO : 0); 426 } 427 428 429 430 /* 431 ** led_work_func() 432 ** 433 ** manages when and which chassis LCD/LED gets updated 434 435 TODO: 436 - display load average (older machines like 715/64 have 4 "free" LED's for that) 437 - optimizations 438 */ 439 440 #define HEARTBEAT_LEN (HZ*10/100) 441 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 442 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 443 444 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 445 446 static void led_work_func (void *unused) 447 { 448 static unsigned long last_jiffies; 449 static unsigned long count_HZ; /* counter in range 0..HZ */ 450 unsigned char currentleds = 0; /* stores current value of the LEDs */ 451 452 /* exit if not initialized */ 453 if (!led_func_ptr) 454 return; 455 456 /* increment the heartbeat timekeeper */ 457 count_HZ += jiffies - last_jiffies; 458 last_jiffies = jiffies; 459 if (count_HZ >= HZ) 460 count_HZ = 0; 461 462 if (likely(led_heartbeat)) 463 { 464 /* flash heartbeat-LED like a real heart 465 * (2 x short then a long delay) 466 */ 467 if (count_HZ < HEARTBEAT_LEN || 468 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 469 count_HZ < HEARTBEAT_2ND_RANGE_END)) 470 currentleds |= LED_HEARTBEAT; 471 } 472 473 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 474 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 475 476 /* blink all LEDs twice a second if we got an Oops (HPMC) */ 477 if (unlikely(oops_in_progress)) 478 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; 479 480 if (currentleds != lastleds) 481 { 482 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 483 lastleds = currentleds; 484 } 485 486 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 487 } 488 489 /* 490 ** led_halt() 491 ** 492 ** called by the reboot notifier chain at shutdown and stops all 493 ** LED/LCD activities. 494 ** 495 */ 496 497 static int led_halt(struct notifier_block *, unsigned long, void *); 498 499 static struct notifier_block led_notifier = { 500 .notifier_call = led_halt, 501 }; 502 static int notifier_disabled = 0; 503 504 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 505 { 506 char *txt; 507 508 if (notifier_disabled) 509 return NOTIFY_OK; 510 511 notifier_disabled = 1; 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 /* Cancel the work item and delete the queue */ 523 if (led_wq) { 524 cancel_rearming_delayed_workqueue(led_wq, &led_task); 525 destroy_workqueue(led_wq); 526 led_wq = NULL; 527 } 528 529 if (lcd_info.model == DISPLAY_MODEL_LCD) 530 lcd_print(txt); 531 else 532 if (led_func_ptr) 533 led_func_ptr(0xff); /* turn all LEDs ON */ 534 535 return NOTIFY_OK; 536 } 537 538 /* 539 ** register_led_driver() 540 ** 541 ** registers an external LED or LCD for usage by this driver. 542 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 543 ** 544 */ 545 546 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 547 { 548 static int initialized; 549 550 if (initialized || !data_reg) 551 return 1; 552 553 lcd_info.model = model; /* store the values */ 554 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 555 556 switch (lcd_info.model) { 557 case DISPLAY_MODEL_LCD: 558 LCD_DATA_REG = data_reg; 559 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 560 LCD_CMD_REG , LCD_DATA_REG); 561 led_func_ptr = led_LCD_driver; 562 led_type = LED_HASLCD; 563 break; 564 565 case DISPLAY_MODEL_LASI: 566 LED_DATA_REG = data_reg; 567 led_func_ptr = led_LASI_driver; 568 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 569 led_type = LED_NOLCD; 570 break; 571 572 case DISPLAY_MODEL_OLD_ASP: 573 LED_DATA_REG = data_reg; 574 led_func_ptr = led_ASP_driver; 575 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 576 LED_DATA_REG); 577 led_type = LED_NOLCD; 578 break; 579 580 default: 581 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 582 __FUNCTION__, lcd_info.model); 583 return 1; 584 } 585 586 /* mark the LCD/LED driver now as initialized and 587 * register to the reboot notifier chain */ 588 initialized++; 589 register_reboot_notifier(&led_notifier); 590 591 /* Ensure the work is queued */ 592 if (led_wq) { 593 queue_work(led_wq, &led_task); 594 } 595 596 return 0; 597 } 598 599 /* 600 ** register_led_regions() 601 ** 602 ** register_led_regions() registers the LCD/LED regions for /procfs. 603 ** At bootup - where the initialisation of the LCD/LED normally happens - 604 ** not all internal structures of request_region() are properly set up, 605 ** so that we delay the led-registration until after busdevices_init() 606 ** has been executed. 607 ** 608 */ 609 610 void __init register_led_regions(void) 611 { 612 switch (lcd_info.model) { 613 case DISPLAY_MODEL_LCD: 614 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 615 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 616 break; 617 case DISPLAY_MODEL_LASI: 618 case DISPLAY_MODEL_OLD_ASP: 619 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 620 break; 621 } 622 } 623 624 625 /* 626 ** 627 ** lcd_print() 628 ** 629 ** Displays the given string on the LCD-Display of newer machines. 630 ** lcd_print() disables/enables the timer-based led work queue to 631 ** avoid a race condition while writing the CMD/DATA register pair. 632 ** 633 */ 634 int lcd_print( char *str ) 635 { 636 int i; 637 638 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 639 return 0; 640 641 /* temporarily disable the led work task */ 642 if (led_wq) 643 cancel_rearming_delayed_workqueue(led_wq, &led_task); 644 645 /* copy display string to buffer for procfs */ 646 strlcpy(lcd_text, str, sizeof(lcd_text)); 647 648 /* Set LCD Cursor to 1st character */ 649 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 650 udelay(lcd_info.min_cmd_delay); 651 652 /* Print the string */ 653 for (i=0; i < lcd_info.lcd_width; i++) { 654 if (str && *str) 655 gsc_writeb(*str++, LCD_DATA_REG); 656 else 657 gsc_writeb(' ', LCD_DATA_REG); 658 udelay(lcd_info.min_cmd_delay); 659 } 660 661 /* re-queue the work */ 662 if (led_wq) { 663 queue_work(led_wq, &led_task); 664 } 665 666 return lcd_info.lcd_width; 667 } 668 669 /* 670 ** led_init() 671 ** 672 ** led_init() is called very early in the bootup-process from setup.c 673 ** and asks the PDC for an usable chassis LCD or LED. 674 ** If the PDC doesn't return any info, then the LED 675 ** is detected by lasi.c or asp.c and registered with the 676 ** above functions lasi_led_init() or asp_led_init(). 677 ** KittyHawk machines have often a buggy PDC, so that 678 ** we explicitly check for those machines here. 679 */ 680 681 int __init led_init(void) 682 { 683 struct pdc_chassis_info chassis_info; 684 int ret; 685 686 snprintf(lcd_text_default, sizeof(lcd_text_default), 687 "Linux %s", system_utsname.release); 688 689 /* Work around the buggy PDC of KittyHawk-machines */ 690 switch (CPU_HVERSION) { 691 case 0x580: /* KittyHawk DC2-100 (K100) */ 692 case 0x581: /* KittyHawk DC3-120 (K210) */ 693 case 0x582: /* KittyHawk DC3 100 (K400) */ 694 case 0x583: /* KittyHawk DC3 120 (K410) */ 695 case 0x58B: /* KittyHawk DC2 100 (K200) */ 696 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 697 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 698 goto found; /* use the preinitialized values of lcd_info */ 699 } 700 701 /* initialize the struct, so that we can check for valid return values */ 702 lcd_info.model = DISPLAY_MODEL_NONE; 703 chassis_info.actcnt = chassis_info.maxcnt = 0; 704 705 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 706 if (ret == PDC_OK) { 707 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 708 "lcd_width=%d, cmd_delay=%u,\n" 709 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 710 __FILE__, lcd_info.model, 711 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 712 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 713 lcd_info.lcd_width, lcd_info.min_cmd_delay, 714 __FILE__, sizeof(lcd_info), 715 chassis_info.actcnt, chassis_info.maxcnt)); 716 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 717 __FILE__, lcd_info.lcd_cmd_reg_addr, 718 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 719 lcd_info.reset_cmd2, lcd_info.act_enable )); 720 721 /* check the results. Some machines have a buggy PDC */ 722 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 723 goto not_found; 724 725 switch (lcd_info.model) { 726 case DISPLAY_MODEL_LCD: /* LCD display */ 727 if (chassis_info.actcnt < 728 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 729 goto not_found; 730 if (!lcd_info.act_enable) { 731 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 732 goto not_found; 733 } 734 break; 735 736 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 737 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 738 goto not_found; 739 740 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 741 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 742 goto not_found; 743 break; 744 745 default: 746 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 747 lcd_info.model); 748 goto not_found; 749 } /* switch() */ 750 751 found: 752 /* register the LCD/LED driver */ 753 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 754 return 0; 755 756 } else { /* if() */ 757 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 758 } 759 760 not_found: 761 lcd_info.model = DISPLAY_MODEL_NONE; 762 return 1; 763 } 764 765 static void __exit led_exit(void) 766 { 767 unregister_reboot_notifier(&led_notifier); 768 return; 769 } 770 771 #ifdef CONFIG_PROC_FS 772 module_init(led_create_procfs) 773 #endif 774