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/module.h> 27 #include <linux/stddef.h> /* for offsetof() */ 28 #include <linux/init.h> 29 #include <linux/types.h> 30 #include <linux/ioport.h> 31 #include <linux/utsname.h> 32 #include <linux/capability.h> 33 #include <linux/delay.h> 34 #include <linux/netdevice.h> 35 #include <linux/inetdevice.h> 36 #include <linux/in.h> 37 #include <linux/interrupt.h> 38 #include <linux/kernel_stat.h> 39 #include <linux/reboot.h> 40 #include <linux/proc_fs.h> 41 #include <linux/ctype.h> 42 #include <linux/blkdev.h> 43 #include <linux/workqueue.h> 44 #include <linux/rcupdate.h> 45 #include <asm/io.h> 46 #include <asm/processor.h> 47 #include <asm/hardware.h> 48 #include <asm/param.h> /* HZ */ 49 #include <asm/led.h> 50 #include <asm/pdc.h> 51 #include <asm/uaccess.h> 52 53 /* The control of the LEDs and LCDs on PARISC-machines have to be done 54 completely in software. The necessary calculations are done in a work queue 55 task which is scheduled regularly, and since the calculations may consume a 56 relatively large amount of CPU time, some of the calculations can be 57 turned off with the following variables (controlled via procfs) */ 58 59 static int led_type __read_mostly = -1; 60 static unsigned char lastleds; /* LED state from most recent update */ 61 static unsigned int led_heartbeat __read_mostly = 1; 62 static unsigned int led_diskio __read_mostly = 1; 63 static unsigned int led_lanrxtx __read_mostly = 1; 64 static char lcd_text[32] __read_mostly; 65 static char lcd_text_default[32] __read_mostly; 66 67 68 static struct workqueue_struct *led_wq; 69 static void led_work_func(struct work_struct *); 70 static DECLARE_DELAYED_WORK(led_task, led_work_func); 71 72 #if 0 73 #define DPRINTK(x) printk x 74 #else 75 #define DPRINTK(x) 76 #endif 77 78 struct lcd_block { 79 unsigned char command; /* stores the command byte */ 80 unsigned char on; /* value for turning LED on */ 81 unsigned char off; /* value for turning LED off */ 82 }; 83 84 /* Structure returned by PDC_RETURN_CHASSIS_INFO */ 85 /* NOTE: we use unsigned long:16 two times, since the following member 86 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ 87 struct pdc_chassis_lcd_info_ret_block { 88 unsigned long model:16; /* DISPLAY_MODEL_XXXX */ 89 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ 90 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ 91 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ 92 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ 93 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ 94 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ 95 unsigned char act_enable; /* 0 = no activity (LCD only) */ 96 struct lcd_block heartbeat; 97 struct lcd_block disk_io; 98 struct lcd_block lan_rcv; 99 struct lcd_block lan_tx; 100 char _pad; 101 }; 102 103 104 /* LCD_CMD and LCD_DATA for KittyHawk machines */ 105 #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ 106 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) 107 108 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's 109 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ 110 static struct pdc_chassis_lcd_info_ret_block 111 lcd_info __attribute__((aligned(8))) __read_mostly = 112 { 113 .model = DISPLAY_MODEL_LCD, 114 .lcd_width = 16, 115 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, 116 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, 117 .min_cmd_delay = 40, 118 .reset_cmd1 = 0x80, 119 .reset_cmd2 = 0xc0, 120 }; 121 122 123 /* direct access to some of the lcd_info variables */ 124 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr 125 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr 126 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ 127 128 #define LED_HASLCD 1 129 #define LED_NOLCD 0 130 131 /* The workqueue must be created at init-time */ 132 static int start_task(void) 133 { 134 /* Display the default text now */ 135 if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); 136 137 /* Create the work queue and queue the LED task */ 138 led_wq = create_singlethread_workqueue("led_wq"); 139 queue_delayed_work(led_wq, &led_task, 0); 140 141 return 0; 142 } 143 144 device_initcall(start_task); 145 146 /* ptr to LCD/LED-specific function */ 147 static void (*led_func_ptr) (unsigned char) __read_mostly; 148 149 #ifdef CONFIG_PROC_FS 150 static int led_proc_read(char *page, char **start, off_t off, int count, 151 int *eof, void *data) 152 { 153 char *out = page; 154 int len; 155 156 switch ((long)data) 157 { 158 case LED_NOLCD: 159 out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); 160 out += sprintf(out, "Disk IO: %d\n", led_diskio); 161 out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); 162 break; 163 case LED_HASLCD: 164 out += sprintf(out, "%s\n", lcd_text); 165 break; 166 default: 167 *eof = 1; 168 return 0; 169 } 170 171 len = out - page - off; 172 if (len < count) { 173 *eof = 1; 174 if (len <= 0) return 0; 175 } else { 176 len = count; 177 } 178 *start = page + off; 179 return len; 180 } 181 182 static int led_proc_write(struct file *file, const char *buf, 183 unsigned long count, void *data) 184 { 185 char *cur, lbuf[count + 1]; 186 int d; 187 188 if (!capable(CAP_SYS_ADMIN)) 189 return -EACCES; 190 191 memset(lbuf, 0, count + 1); 192 193 if (copy_from_user(lbuf, buf, count)) 194 return -EFAULT; 195 196 cur = lbuf; 197 198 /* skip initial spaces */ 199 while (*cur && isspace(*cur)) 200 { 201 cur++; 202 } 203 204 switch ((long)data) 205 { 206 case LED_NOLCD: 207 d = *cur++ - '0'; 208 if (d != 0 && d != 1) goto parse_error; 209 led_heartbeat = d; 210 211 if (*cur++ != ' ') goto parse_error; 212 213 d = *cur++ - '0'; 214 if (d != 0 && d != 1) goto parse_error; 215 led_diskio = d; 216 217 if (*cur++ != ' ') goto parse_error; 218 219 d = *cur++ - '0'; 220 if (d != 0 && d != 1) goto parse_error; 221 led_lanrxtx = d; 222 223 break; 224 case LED_HASLCD: 225 if (*cur && cur[strlen(cur)-1] == '\n') 226 cur[strlen(cur)-1] = 0; 227 if (*cur == 0) 228 cur = lcd_text_default; 229 lcd_print(cur); 230 break; 231 default: 232 return 0; 233 } 234 235 return count; 236 237 parse_error: 238 if ((long)data == LED_NOLCD) 239 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 240 return -EINVAL; 241 } 242 243 static int __init led_create_procfs(void) 244 { 245 struct proc_dir_entry *proc_pdc_root = NULL; 246 struct proc_dir_entry *ent; 247 248 if (led_type == -1) return -1; 249 250 proc_pdc_root = proc_mkdir("pdc", 0); 251 if (!proc_pdc_root) return -1; 252 proc_pdc_root->owner = THIS_MODULE; 253 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 254 if (!ent) return -1; 255 ent->data = (void *)LED_NOLCD; /* LED */ 256 ent->read_proc = led_proc_read; 257 ent->write_proc = led_proc_write; 258 ent->owner = THIS_MODULE; 259 260 if (led_type == LED_HASLCD) 261 { 262 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 263 if (!ent) return -1; 264 ent->data = (void *)LED_HASLCD; /* LCD */ 265 ent->read_proc = led_proc_read; 266 ent->write_proc = led_proc_write; 267 ent->owner = THIS_MODULE; 268 } 269 270 return 0; 271 } 272 #endif 273 274 /* 275 ** 276 ** led_ASP_driver() 277 ** 278 */ 279 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 280 #define LED_STROBE 0x02 /* strobe to clock data */ 281 static void led_ASP_driver(unsigned char leds) 282 { 283 int i; 284 285 leds = ~leds; 286 for (i = 0; i < 8; i++) { 287 unsigned char value; 288 value = (leds & 0x80) >> 7; 289 gsc_writeb( value, LED_DATA_REG ); 290 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 291 leds <<= 1; 292 } 293 } 294 295 296 /* 297 ** 298 ** led_LASI_driver() 299 ** 300 */ 301 static void led_LASI_driver(unsigned char leds) 302 { 303 leds = ~leds; 304 gsc_writeb( leds, LED_DATA_REG ); 305 } 306 307 308 /* 309 ** 310 ** led_LCD_driver() 311 ** 312 */ 313 static void led_LCD_driver(unsigned char leds) 314 { 315 static int i; 316 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 317 LED_LAN_RCV, LED_LAN_TX }; 318 319 static struct lcd_block * blockp[4] = { 320 &lcd_info.heartbeat, 321 &lcd_info.disk_io, 322 &lcd_info.lan_rcv, 323 &lcd_info.lan_tx 324 }; 325 326 /* Convert min_cmd_delay to milliseconds */ 327 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 328 329 for (i=0; i<4; ++i) 330 { 331 if ((leds & mask[i]) != (lastleds & mask[i])) 332 { 333 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 334 msleep(msec_cmd_delay); 335 336 gsc_writeb( leds & mask[i] ? blockp[i]->on : 337 blockp[i]->off, LCD_DATA_REG ); 338 msleep(msec_cmd_delay); 339 } 340 } 341 } 342 343 344 /* 345 ** 346 ** led_get_net_activity() 347 ** 348 ** calculate if there was TX- or RX-throughput on the network interfaces 349 ** (analog to dev_get_info() from net/core/dev.c) 350 ** 351 */ 352 static __inline__ int led_get_net_activity(void) 353 { 354 #ifndef CONFIG_NET 355 return 0; 356 #else 357 static unsigned long rx_total_last, tx_total_last; 358 unsigned long rx_total, tx_total; 359 struct net_device *dev; 360 int retval; 361 362 rx_total = tx_total = 0; 363 364 /* we are running as a workqueue task, so locking dev_base 365 * for reading should be OK */ 366 read_lock(&dev_base_lock); 367 rcu_read_lock(); 368 for (dev = dev_base; dev; dev = dev->next) { 369 struct net_device_stats *stats; 370 struct in_device *in_dev = __in_dev_get_rcu(dev); 371 if (!in_dev || !in_dev->ifa_list) 372 continue; 373 if (LOOPBACK(in_dev->ifa_list->ifa_local)) 374 continue; 375 if (!dev->get_stats) 376 continue; 377 stats = dev->get_stats(dev); 378 rx_total += stats->rx_packets; 379 tx_total += stats->tx_packets; 380 } 381 rcu_read_unlock(); 382 read_unlock(&dev_base_lock); 383 384 retval = 0; 385 386 if (rx_total != rx_total_last) { 387 rx_total_last = rx_total; 388 retval |= LED_LAN_RCV; 389 } 390 391 if (tx_total != tx_total_last) { 392 tx_total_last = tx_total; 393 retval |= LED_LAN_TX; 394 } 395 396 return retval; 397 #endif 398 } 399 400 401 /* 402 ** 403 ** led_get_diskio_activity() 404 ** 405 ** calculate if there was disk-io in the system 406 ** 407 */ 408 static __inline__ int led_get_diskio_activity(void) 409 { 410 static unsigned long last_pgpgin, last_pgpgout; 411 unsigned long events[NR_VM_EVENT_ITEMS]; 412 int changed; 413 414 all_vm_events(events); 415 416 /* Just use a very simple calculation here. Do not care about overflow, 417 since we only want to know if there was activity or not. */ 418 changed = (events[PGPGIN] != last_pgpgin) || 419 (events[PGPGOUT] != last_pgpgout); 420 last_pgpgin = events[PGPGIN]; 421 last_pgpgout = events[PGPGOUT]; 422 423 return (changed ? LED_DISK_IO : 0); 424 } 425 426 427 428 /* 429 ** led_work_func() 430 ** 431 ** manages when and which chassis LCD/LED gets updated 432 433 TODO: 434 - display load average (older machines like 715/64 have 4 "free" LED's for that) 435 - optimizations 436 */ 437 438 #define HEARTBEAT_LEN (HZ*10/100) 439 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 440 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 441 442 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 443 444 static void led_work_func (struct work_struct *unused) 445 { 446 static unsigned long last_jiffies; 447 static unsigned long count_HZ; /* counter in range 0..HZ */ 448 unsigned char currentleds = 0; /* stores current value of the LEDs */ 449 450 /* exit if not initialized */ 451 if (!led_func_ptr) 452 return; 453 454 /* increment the heartbeat timekeeper */ 455 count_HZ += jiffies - last_jiffies; 456 last_jiffies = jiffies; 457 if (count_HZ >= HZ) 458 count_HZ = 0; 459 460 if (likely(led_heartbeat)) 461 { 462 /* flash heartbeat-LED like a real heart 463 * (2 x short then a long delay) 464 */ 465 if (count_HZ < HEARTBEAT_LEN || 466 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 467 count_HZ < HEARTBEAT_2ND_RANGE_END)) 468 currentleds |= LED_HEARTBEAT; 469 } 470 471 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 472 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 473 474 /* blink all LEDs twice a second if we got an Oops (HPMC) */ 475 if (unlikely(oops_in_progress)) 476 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; 477 478 if (currentleds != lastleds) 479 { 480 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 481 lastleds = currentleds; 482 } 483 484 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 485 } 486 487 /* 488 ** led_halt() 489 ** 490 ** called by the reboot notifier chain at shutdown and stops all 491 ** LED/LCD activities. 492 ** 493 */ 494 495 static int led_halt(struct notifier_block *, unsigned long, void *); 496 497 static struct notifier_block led_notifier = { 498 .notifier_call = led_halt, 499 }; 500 static int notifier_disabled = 0; 501 502 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 503 { 504 char *txt; 505 506 if (notifier_disabled) 507 return NOTIFY_OK; 508 509 notifier_disabled = 1; 510 switch (event) { 511 case SYS_RESTART: txt = "SYSTEM RESTART"; 512 break; 513 case SYS_HALT: txt = "SYSTEM HALT"; 514 break; 515 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 516 break; 517 default: return NOTIFY_DONE; 518 } 519 520 /* Cancel the work item and delete the queue */ 521 if (led_wq) { 522 cancel_rearming_delayed_workqueue(led_wq, &led_task); 523 destroy_workqueue(led_wq); 524 led_wq = NULL; 525 } 526 527 if (lcd_info.model == DISPLAY_MODEL_LCD) 528 lcd_print(txt); 529 else 530 if (led_func_ptr) 531 led_func_ptr(0xff); /* turn all LEDs ON */ 532 533 return NOTIFY_OK; 534 } 535 536 /* 537 ** register_led_driver() 538 ** 539 ** registers an external LED or LCD for usage by this driver. 540 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 541 ** 542 */ 543 544 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 545 { 546 static int initialized; 547 548 if (initialized || !data_reg) 549 return 1; 550 551 lcd_info.model = model; /* store the values */ 552 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 553 554 switch (lcd_info.model) { 555 case DISPLAY_MODEL_LCD: 556 LCD_DATA_REG = data_reg; 557 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 558 LCD_CMD_REG , LCD_DATA_REG); 559 led_func_ptr = led_LCD_driver; 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 /* Ensure the work is queued */ 590 if (led_wq) { 591 queue_delayed_work(led_wq, &led_task, 0); 592 } 593 594 return 0; 595 } 596 597 /* 598 ** register_led_regions() 599 ** 600 ** register_led_regions() registers the LCD/LED regions for /procfs. 601 ** At bootup - where the initialisation of the LCD/LED normally happens - 602 ** not all internal structures of request_region() are properly set up, 603 ** so that we delay the led-registration until after busdevices_init() 604 ** has been executed. 605 ** 606 */ 607 608 void __init register_led_regions(void) 609 { 610 switch (lcd_info.model) { 611 case DISPLAY_MODEL_LCD: 612 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 613 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 614 break; 615 case DISPLAY_MODEL_LASI: 616 case DISPLAY_MODEL_OLD_ASP: 617 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 618 break; 619 } 620 } 621 622 623 /* 624 ** 625 ** lcd_print() 626 ** 627 ** Displays the given string on the LCD-Display of newer machines. 628 ** lcd_print() disables/enables the timer-based led work queue to 629 ** avoid a race condition while writing the CMD/DATA register pair. 630 ** 631 */ 632 int lcd_print( const char *str ) 633 { 634 int i; 635 636 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 637 return 0; 638 639 /* temporarily disable the led work task */ 640 if (led_wq) 641 cancel_rearming_delayed_workqueue(led_wq, &led_task); 642 643 /* copy display string to buffer for procfs */ 644 strlcpy(lcd_text, str, sizeof(lcd_text)); 645 646 /* Set LCD Cursor to 1st character */ 647 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 648 udelay(lcd_info.min_cmd_delay); 649 650 /* Print the string */ 651 for (i=0; i < lcd_info.lcd_width; i++) { 652 if (str && *str) 653 gsc_writeb(*str++, LCD_DATA_REG); 654 else 655 gsc_writeb(' ', LCD_DATA_REG); 656 udelay(lcd_info.min_cmd_delay); 657 } 658 659 /* re-queue the work */ 660 if (led_wq) { 661 queue_delayed_work(led_wq, &led_task, 0); 662 } 663 664 return lcd_info.lcd_width; 665 } 666 667 /* 668 ** led_init() 669 ** 670 ** led_init() is called very early in the bootup-process from setup.c 671 ** and asks the PDC for an usable chassis LCD or LED. 672 ** If the PDC doesn't return any info, then the LED 673 ** is detected by lasi.c or asp.c and registered with the 674 ** above functions lasi_led_init() or asp_led_init(). 675 ** KittyHawk machines have often a buggy PDC, so that 676 ** we explicitly check for those machines here. 677 */ 678 679 int __init led_init(void) 680 { 681 struct pdc_chassis_info chassis_info; 682 int ret; 683 684 snprintf(lcd_text_default, sizeof(lcd_text_default), 685 "Linux %s", init_utsname()->release); 686 687 /* Work around the buggy PDC of KittyHawk-machines */ 688 switch (CPU_HVERSION) { 689 case 0x580: /* KittyHawk DC2-100 (K100) */ 690 case 0x581: /* KittyHawk DC3-120 (K210) */ 691 case 0x582: /* KittyHawk DC3 100 (K400) */ 692 case 0x583: /* KittyHawk DC3 120 (K410) */ 693 case 0x58B: /* KittyHawk DC2 100 (K200) */ 694 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 695 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 696 goto found; /* use the preinitialized values of lcd_info */ 697 } 698 699 /* initialize the struct, so that we can check for valid return values */ 700 lcd_info.model = DISPLAY_MODEL_NONE; 701 chassis_info.actcnt = chassis_info.maxcnt = 0; 702 703 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 704 if (ret == PDC_OK) { 705 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 706 "lcd_width=%d, cmd_delay=%u,\n" 707 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 708 __FILE__, lcd_info.model, 709 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 710 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 711 lcd_info.lcd_width, lcd_info.min_cmd_delay, 712 __FILE__, sizeof(lcd_info), 713 chassis_info.actcnt, chassis_info.maxcnt)); 714 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 715 __FILE__, lcd_info.lcd_cmd_reg_addr, 716 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 717 lcd_info.reset_cmd2, lcd_info.act_enable )); 718 719 /* check the results. Some machines have a buggy PDC */ 720 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 721 goto not_found; 722 723 switch (lcd_info.model) { 724 case DISPLAY_MODEL_LCD: /* LCD display */ 725 if (chassis_info.actcnt < 726 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 727 goto not_found; 728 if (!lcd_info.act_enable) { 729 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 730 goto not_found; 731 } 732 break; 733 734 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 735 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 736 goto not_found; 737 738 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 739 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 740 goto not_found; 741 break; 742 743 default: 744 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 745 lcd_info.model); 746 goto not_found; 747 } /* switch() */ 748 749 found: 750 /* register the LCD/LED driver */ 751 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 752 return 0; 753 754 } else { /* if() */ 755 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 756 } 757 758 not_found: 759 lcd_info.model = DISPLAY_MODEL_NONE; 760 return 1; 761 } 762 763 static void __exit led_exit(void) 764 { 765 unregister_reboot_notifier(&led_notifier); 766 return; 767 } 768 769 #ifdef CONFIG_PROC_FS 770 module_init(led_create_procfs) 771 #endif 772