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 switch ((long)data) 199 { 200 case LED_NOLCD: 201 d = *cur++ - '0'; 202 if (d != 0 && d != 1) goto parse_error; 203 led_heartbeat = d; 204 205 if (*cur++ != ' ') goto parse_error; 206 207 d = *cur++ - '0'; 208 if (d != 0 && d != 1) goto parse_error; 209 led_diskio = d; 210 211 if (*cur++ != ' ') goto parse_error; 212 213 d = *cur++ - '0'; 214 if (d != 0 && d != 1) goto parse_error; 215 led_lanrxtx = d; 216 217 break; 218 case LED_HASLCD: 219 if (*cur && cur[strlen(cur)-1] == '\n') 220 cur[strlen(cur)-1] = 0; 221 if (*cur == 0) 222 cur = lcd_text_default; 223 lcd_print(cur); 224 break; 225 default: 226 return 0; 227 } 228 229 return count; 230 231 parse_error: 232 if ((long)data == LED_NOLCD) 233 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 234 return -EINVAL; 235 } 236 237 static int __init led_create_procfs(void) 238 { 239 struct proc_dir_entry *proc_pdc_root = NULL; 240 struct proc_dir_entry *ent; 241 242 if (led_type == -1) return -1; 243 244 proc_pdc_root = proc_mkdir("pdc", 0); 245 if (!proc_pdc_root) return -1; 246 proc_pdc_root->owner = THIS_MODULE; 247 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 248 if (!ent) return -1; 249 ent->data = (void *)LED_NOLCD; /* LED */ 250 ent->read_proc = led_proc_read; 251 ent->write_proc = led_proc_write; 252 ent->owner = THIS_MODULE; 253 254 if (led_type == LED_HASLCD) 255 { 256 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 257 if (!ent) return -1; 258 ent->data = (void *)LED_HASLCD; /* LCD */ 259 ent->read_proc = led_proc_read; 260 ent->write_proc = led_proc_write; 261 ent->owner = THIS_MODULE; 262 } 263 264 return 0; 265 } 266 #endif 267 268 /* 269 ** 270 ** led_ASP_driver() 271 ** 272 */ 273 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 274 #define LED_STROBE 0x02 /* strobe to clock data */ 275 static void led_ASP_driver(unsigned char leds) 276 { 277 int i; 278 279 leds = ~leds; 280 for (i = 0; i < 8; i++) { 281 unsigned char value; 282 value = (leds & 0x80) >> 7; 283 gsc_writeb( value, LED_DATA_REG ); 284 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 285 leds <<= 1; 286 } 287 } 288 289 290 /* 291 ** 292 ** led_LASI_driver() 293 ** 294 */ 295 static void led_LASI_driver(unsigned char leds) 296 { 297 leds = ~leds; 298 gsc_writeb( leds, LED_DATA_REG ); 299 } 300 301 302 /* 303 ** 304 ** led_LCD_driver() 305 ** 306 */ 307 static void led_LCD_driver(unsigned char leds) 308 { 309 static int i; 310 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 311 LED_LAN_RCV, LED_LAN_TX }; 312 313 static struct lcd_block * blockp[4] = { 314 &lcd_info.heartbeat, 315 &lcd_info.disk_io, 316 &lcd_info.lan_rcv, 317 &lcd_info.lan_tx 318 }; 319 320 /* Convert min_cmd_delay to milliseconds */ 321 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 322 323 for (i=0; i<4; ++i) 324 { 325 if ((leds & mask[i]) != (lastleds & mask[i])) 326 { 327 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 328 msleep(msec_cmd_delay); 329 330 gsc_writeb( leds & mask[i] ? blockp[i]->on : 331 blockp[i]->off, LCD_DATA_REG ); 332 msleep(msec_cmd_delay); 333 } 334 } 335 } 336 337 338 /* 339 ** 340 ** led_get_net_activity() 341 ** 342 ** calculate if there was TX- or RX-throughput 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 a workqueue task, so locking dev_base 359 * for reading should be OK */ 360 read_lock(&dev_base_lock); 361 rcu_read_lock(); 362 for_each_netdev(&init_net, dev) { 363 struct net_device_stats *stats; 364 struct in_device *in_dev = __in_dev_get_rcu(dev); 365 if (!in_dev || !in_dev->ifa_list) 366 continue; 367 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) 368 continue; 369 stats = dev->get_stats(dev); 370 rx_total += stats->rx_packets; 371 tx_total += stats->tx_packets; 372 } 373 rcu_read_unlock(); 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 unsigned long events[NR_VM_EVENT_ITEMS]; 404 int changed; 405 406 all_vm_events(events); 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 = (events[PGPGIN] != last_pgpgin) || 411 (events[PGPGOUT] != last_pgpgout); 412 last_pgpgin = events[PGPGIN]; 413 last_pgpgout = events[PGPGOUT]; 414 415 return (changed ? LED_DISK_IO : 0); 416 } 417 418 419 420 /* 421 ** led_work_func() 422 ** 423 ** manages when and which chassis LCD/LED gets updated 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*10/100) 431 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 432 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 433 434 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 435 436 static void led_work_func (struct work_struct *unused) 437 { 438 static unsigned long last_jiffies; 439 static unsigned long count_HZ; /* counter in range 0..HZ */ 440 unsigned char currentleds = 0; /* stores current value of the LEDs */ 441 442 /* exit if not initialized */ 443 if (!led_func_ptr) 444 return; 445 446 /* increment the heartbeat timekeeper */ 447 count_HZ += jiffies - last_jiffies; 448 last_jiffies = jiffies; 449 if (count_HZ >= HZ) 450 count_HZ = 0; 451 452 if (likely(led_heartbeat)) 453 { 454 /* flash heartbeat-LED like a real heart 455 * (2 x short then a long delay) 456 */ 457 if (count_HZ < HEARTBEAT_LEN || 458 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 459 count_HZ < HEARTBEAT_2ND_RANGE_END)) 460 currentleds |= LED_HEARTBEAT; 461 } 462 463 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 464 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 465 466 /* blink all LEDs twice a second if we got an Oops (HPMC) */ 467 if (unlikely(oops_in_progress)) 468 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; 469 470 if (currentleds != lastleds) 471 { 472 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 473 lastleds = currentleds; 474 } 475 476 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 477 } 478 479 /* 480 ** led_halt() 481 ** 482 ** called by the reboot notifier chain at shutdown and stops all 483 ** LED/LCD activities. 484 ** 485 */ 486 487 static int led_halt(struct notifier_block *, unsigned long, void *); 488 489 static struct notifier_block led_notifier = { 490 .notifier_call = led_halt, 491 }; 492 static int notifier_disabled = 0; 493 494 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 495 { 496 char *txt; 497 498 if (notifier_disabled) 499 return NOTIFY_OK; 500 501 notifier_disabled = 1; 502 switch (event) { 503 case SYS_RESTART: txt = "SYSTEM RESTART"; 504 break; 505 case SYS_HALT: txt = "SYSTEM HALT"; 506 break; 507 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 508 break; 509 default: return NOTIFY_DONE; 510 } 511 512 /* Cancel the work item and delete the queue */ 513 if (led_wq) { 514 cancel_rearming_delayed_workqueue(led_wq, &led_task); 515 destroy_workqueue(led_wq); 516 led_wq = NULL; 517 } 518 519 if (lcd_info.model == DISPLAY_MODEL_LCD) 520 lcd_print(txt); 521 else 522 if (led_func_ptr) 523 led_func_ptr(0xff); /* turn all LEDs ON */ 524 525 return NOTIFY_OK; 526 } 527 528 /* 529 ** register_led_driver() 530 ** 531 ** registers an external LED or LCD for usage by this driver. 532 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 533 ** 534 */ 535 536 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 537 { 538 static int initialized; 539 540 if (initialized || !data_reg) 541 return 1; 542 543 lcd_info.model = model; /* store the values */ 544 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 545 546 switch (lcd_info.model) { 547 case DISPLAY_MODEL_LCD: 548 LCD_DATA_REG = data_reg; 549 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 550 LCD_CMD_REG , LCD_DATA_REG); 551 led_func_ptr = led_LCD_driver; 552 led_type = LED_HASLCD; 553 break; 554 555 case DISPLAY_MODEL_LASI: 556 LED_DATA_REG = data_reg; 557 led_func_ptr = led_LASI_driver; 558 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 559 led_type = LED_NOLCD; 560 break; 561 562 case DISPLAY_MODEL_OLD_ASP: 563 LED_DATA_REG = data_reg; 564 led_func_ptr = led_ASP_driver; 565 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 566 LED_DATA_REG); 567 led_type = LED_NOLCD; 568 break; 569 570 default: 571 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 572 __func__, lcd_info.model); 573 return 1; 574 } 575 576 /* mark the LCD/LED driver now as initialized and 577 * register to the reboot notifier chain */ 578 initialized++; 579 register_reboot_notifier(&led_notifier); 580 581 /* Ensure the work is queued */ 582 if (led_wq) { 583 queue_delayed_work(led_wq, &led_task, 0); 584 } 585 586 return 0; 587 } 588 589 /* 590 ** register_led_regions() 591 ** 592 ** register_led_regions() registers the LCD/LED regions for /procfs. 593 ** At bootup - where the initialisation of the LCD/LED normally happens - 594 ** not all internal structures of request_region() are properly set up, 595 ** so that we delay the led-registration until after busdevices_init() 596 ** has been executed. 597 ** 598 */ 599 600 void __init register_led_regions(void) 601 { 602 switch (lcd_info.model) { 603 case DISPLAY_MODEL_LCD: 604 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 605 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 606 break; 607 case DISPLAY_MODEL_LASI: 608 case DISPLAY_MODEL_OLD_ASP: 609 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 610 break; 611 } 612 } 613 614 615 /* 616 ** 617 ** lcd_print() 618 ** 619 ** Displays the given string on the LCD-Display of newer machines. 620 ** lcd_print() disables/enables the timer-based led work queue to 621 ** avoid a race condition while writing the CMD/DATA register pair. 622 ** 623 */ 624 int lcd_print( const char *str ) 625 { 626 int i; 627 628 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 629 return 0; 630 631 /* temporarily disable the led work task */ 632 if (led_wq) 633 cancel_rearming_delayed_workqueue(led_wq, &led_task); 634 635 /* copy display string to buffer for procfs */ 636 strlcpy(lcd_text, str, sizeof(lcd_text)); 637 638 /* Set LCD Cursor to 1st character */ 639 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 640 udelay(lcd_info.min_cmd_delay); 641 642 /* Print the string */ 643 for (i=0; i < lcd_info.lcd_width; i++) { 644 if (str && *str) 645 gsc_writeb(*str++, LCD_DATA_REG); 646 else 647 gsc_writeb(' ', LCD_DATA_REG); 648 udelay(lcd_info.min_cmd_delay); 649 } 650 651 /* re-queue the work */ 652 if (led_wq) { 653 queue_delayed_work(led_wq, &led_task, 0); 654 } 655 656 return lcd_info.lcd_width; 657 } 658 659 /* 660 ** led_init() 661 ** 662 ** led_init() is called very early in the bootup-process from setup.c 663 ** and asks the PDC for an usable chassis LCD or LED. 664 ** If the PDC doesn't return any info, then the LED 665 ** is detected by lasi.c or asp.c and registered with the 666 ** above functions lasi_led_init() or asp_led_init(). 667 ** KittyHawk machines have often a buggy PDC, so that 668 ** we explicitly check for those machines here. 669 */ 670 671 int __init led_init(void) 672 { 673 struct pdc_chassis_info chassis_info; 674 int ret; 675 676 snprintf(lcd_text_default, sizeof(lcd_text_default), 677 "Linux %s", init_utsname()->release); 678 679 /* Work around the buggy PDC of KittyHawk-machines */ 680 switch (CPU_HVERSION) { 681 case 0x580: /* KittyHawk DC2-100 (K100) */ 682 case 0x581: /* KittyHawk DC3-120 (K210) */ 683 case 0x582: /* KittyHawk DC3 100 (K400) */ 684 case 0x583: /* KittyHawk DC3 120 (K410) */ 685 case 0x58B: /* KittyHawk DC2 100 (K200) */ 686 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 687 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 688 goto found; /* use the preinitialized values of lcd_info */ 689 } 690 691 /* initialize the struct, so that we can check for valid return values */ 692 lcd_info.model = DISPLAY_MODEL_NONE; 693 chassis_info.actcnt = chassis_info.maxcnt = 0; 694 695 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 696 if (ret == PDC_OK) { 697 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 698 "lcd_width=%d, cmd_delay=%u,\n" 699 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 700 __FILE__, lcd_info.model, 701 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 702 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 703 lcd_info.lcd_width, lcd_info.min_cmd_delay, 704 __FILE__, sizeof(lcd_info), 705 chassis_info.actcnt, chassis_info.maxcnt)); 706 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 707 __FILE__, lcd_info.lcd_cmd_reg_addr, 708 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 709 lcd_info.reset_cmd2, lcd_info.act_enable )); 710 711 /* check the results. Some machines have a buggy PDC */ 712 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 713 goto not_found; 714 715 switch (lcd_info.model) { 716 case DISPLAY_MODEL_LCD: /* LCD display */ 717 if (chassis_info.actcnt < 718 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 719 goto not_found; 720 if (!lcd_info.act_enable) { 721 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 722 goto not_found; 723 } 724 break; 725 726 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 727 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 728 goto not_found; 729 730 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 731 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 732 goto not_found; 733 break; 734 735 default: 736 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 737 lcd_info.model); 738 goto not_found; 739 } /* switch() */ 740 741 found: 742 /* register the LCD/LED driver */ 743 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 744 return 0; 745 746 } else { /* if() */ 747 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 748 } 749 750 not_found: 751 lcd_info.model = DISPLAY_MODEL_NONE; 752 return 1; 753 } 754 755 static void __exit led_exit(void) 756 { 757 unregister_reboot_notifier(&led_notifier); 758 return; 759 } 760 761 #ifdef CONFIG_PROC_FS 762 module_init(led_create_procfs) 763 #endif 764