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 * - 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/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 = -1; 60 static unsigned char lastleds; /* LED state from most recent update */ 61 static unsigned int led_heartbeat = 1; 62 static unsigned int led_diskio = 1; 63 static unsigned int led_lanrxtx = 1; 64 static char lcd_text[32]; 65 static char lcd_text_default[32]; 66 67 68 static struct workqueue_struct *led_wq; 69 static void led_work_func(void *); 70 static DECLARE_WORK(led_task, led_work_func, NULL); 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))) = 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_work(led_wq, &led_task); 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); 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->nlink = 1; 256 ent->data = (void *)LED_NOLCD; /* LED */ 257 ent->read_proc = led_proc_read; 258 ent->write_proc = led_proc_write; 259 ent->owner = THIS_MODULE; 260 261 if (led_type == LED_HASLCD) 262 { 263 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); 264 if (!ent) return -1; 265 ent->nlink = 1; 266 ent->data = (void *)LED_HASLCD; /* LCD */ 267 ent->read_proc = led_proc_read; 268 ent->write_proc = led_proc_write; 269 ent->owner = THIS_MODULE; 270 } 271 272 return 0; 273 } 274 #endif 275 276 /* 277 ** 278 ** led_ASP_driver() 279 ** 280 */ 281 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 282 #define LED_STROBE 0x02 /* strobe to clock data */ 283 static void led_ASP_driver(unsigned char leds) 284 { 285 int i; 286 287 leds = ~leds; 288 for (i = 0; i < 8; i++) { 289 unsigned char value; 290 value = (leds & 0x80) >> 7; 291 gsc_writeb( value, LED_DATA_REG ); 292 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 293 leds <<= 1; 294 } 295 } 296 297 298 /* 299 ** 300 ** led_LASI_driver() 301 ** 302 */ 303 static void led_LASI_driver(unsigned char leds) 304 { 305 leds = ~leds; 306 gsc_writeb( leds, LED_DATA_REG ); 307 } 308 309 310 /* 311 ** 312 ** led_LCD_driver() 313 ** 314 */ 315 static void led_LCD_driver(unsigned char leds) 316 { 317 static int i; 318 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 319 LED_LAN_RCV, LED_LAN_TX }; 320 321 static struct lcd_block * blockp[4] = { 322 &lcd_info.heartbeat, 323 &lcd_info.disk_io, 324 &lcd_info.lan_rcv, 325 &lcd_info.lan_tx 326 }; 327 328 /* Convert min_cmd_delay to milliseconds */ 329 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 330 331 for (i=0; i<4; ++i) 332 { 333 if ((leds & mask[i]) != (lastleds & mask[i])) 334 { 335 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 336 msleep(msec_cmd_delay); 337 338 gsc_writeb( leds & mask[i] ? blockp[i]->on : 339 blockp[i]->off, LCD_DATA_REG ); 340 msleep(msec_cmd_delay); 341 } 342 } 343 } 344 345 346 /* 347 ** 348 ** led_get_net_activity() 349 ** 350 ** calculate if there was TX- or RX-throughput on the network interfaces 351 ** (analog to dev_get_info() from net/core/dev.c) 352 ** 353 */ 354 static __inline__ int led_get_net_activity(void) 355 { 356 #ifndef CONFIG_NET 357 return 0; 358 #else 359 static unsigned long rx_total_last, tx_total_last; 360 unsigned long rx_total, tx_total; 361 struct net_device *dev; 362 int retval; 363 364 rx_total = tx_total = 0; 365 366 /* we are running as a workqueue task, so locking dev_base 367 * for reading should be OK */ 368 read_lock(&dev_base_lock); 369 rcu_read_lock(); 370 for (dev = dev_base; dev; dev = dev->next) { 371 struct net_device_stats *stats; 372 struct in_device *in_dev = __in_dev_get_rcu(dev); 373 if (!in_dev || !in_dev->ifa_list) 374 continue; 375 if (LOOPBACK(in_dev->ifa_list->ifa_local)) 376 continue; 377 if (!dev->get_stats) 378 continue; 379 stats = dev->get_stats(dev); 380 rx_total += stats->rx_packets; 381 tx_total += stats->tx_packets; 382 } 383 rcu_read_unlock(); 384 read_unlock(&dev_base_lock); 385 386 retval = 0; 387 388 if (rx_total != rx_total_last) { 389 rx_total_last = rx_total; 390 retval |= LED_LAN_RCV; 391 } 392 393 if (tx_total != tx_total_last) { 394 tx_total_last = tx_total; 395 retval |= LED_LAN_TX; 396 } 397 398 return retval; 399 #endif 400 } 401 402 403 /* 404 ** 405 ** led_get_diskio_activity() 406 ** 407 ** calculate if there was disk-io in the system 408 ** 409 */ 410 static __inline__ int led_get_diskio_activity(void) 411 { 412 static unsigned long last_pgpgin, last_pgpgout; 413 struct page_state pgstat; 414 int changed; 415 416 get_full_page_state(&pgstat); /* get no of sectors in & out */ 417 418 /* Just use a very simple calculation here. Do not care about overflow, 419 since we only want to know if there was activity or not. */ 420 changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout); 421 last_pgpgin = pgstat.pgpgin; 422 last_pgpgout = pgstat.pgpgout; 423 424 return (changed ? LED_DISK_IO : 0); 425 } 426 427 428 429 /* 430 ** led_work_func() 431 ** 432 ** manages when and which chassis LCD/LED gets updated 433 434 TODO: 435 - display load average (older machines like 715/64 have 4 "free" LED's for that) 436 - optimizations 437 */ 438 439 #define HEARTBEAT_LEN (HZ*10/100) 440 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 441 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 442 443 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 444 445 static void led_work_func (void *unused) 446 { 447 static unsigned long last_jiffies; 448 static unsigned long count_HZ; /* counter in range 0..HZ */ 449 unsigned char currentleds = 0; /* stores current value of the LEDs */ 450 451 /* exit if not initialized */ 452 if (!led_func_ptr) 453 return; 454 455 /* increment the heartbeat timekeeper */ 456 count_HZ += jiffies - last_jiffies; 457 last_jiffies = jiffies; 458 if (count_HZ >= HZ) 459 count_HZ = 0; 460 461 if (likely(led_heartbeat)) 462 { 463 /* flash heartbeat-LED like a real heart 464 * (2 x short then a long delay) 465 */ 466 if (count_HZ < HEARTBEAT_LEN || 467 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 468 count_HZ < HEARTBEAT_2ND_RANGE_END)) 469 currentleds |= LED_HEARTBEAT; 470 } 471 472 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 473 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 474 475 /* blink all LEDs twice a second if we got an Oops (HPMC) */ 476 if (unlikely(oops_in_progress)) 477 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; 478 479 if (currentleds != lastleds) 480 { 481 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 482 lastleds = currentleds; 483 } 484 485 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 486 } 487 488 /* 489 ** led_halt() 490 ** 491 ** called by the reboot notifier chain at shutdown and stops all 492 ** LED/LCD activities. 493 ** 494 */ 495 496 static int led_halt(struct notifier_block *, unsigned long, void *); 497 498 static struct notifier_block led_notifier = { 499 .notifier_call = led_halt, 500 }; 501 502 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 503 { 504 char *txt; 505 506 switch (event) { 507 case SYS_RESTART: txt = "SYSTEM RESTART"; 508 break; 509 case SYS_HALT: txt = "SYSTEM HALT"; 510 break; 511 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 512 break; 513 default: return NOTIFY_DONE; 514 } 515 516 /* Cancel the work item and delete the queue */ 517 if (led_wq) { 518 cancel_rearming_delayed_workqueue(led_wq, &led_task); 519 destroy_workqueue(led_wq); 520 led_wq = NULL; 521 } 522 523 if (lcd_info.model == DISPLAY_MODEL_LCD) 524 lcd_print(txt); 525 else 526 if (led_func_ptr) 527 led_func_ptr(0xff); /* turn all LEDs ON */ 528 529 unregister_reboot_notifier(&led_notifier); 530 return NOTIFY_OK; 531 } 532 533 /* 534 ** register_led_driver() 535 ** 536 ** registers an external LED or LCD for usage by this driver. 537 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 538 ** 539 */ 540 541 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 542 { 543 static int initialized; 544 545 if (initialized || !data_reg) 546 return 1; 547 548 lcd_info.model = model; /* store the values */ 549 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 550 551 switch (lcd_info.model) { 552 case DISPLAY_MODEL_LCD: 553 LCD_DATA_REG = data_reg; 554 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 555 LCD_CMD_REG , LCD_DATA_REG); 556 led_func_ptr = led_LCD_driver; 557 led_type = LED_HASLCD; 558 break; 559 560 case DISPLAY_MODEL_LASI: 561 LED_DATA_REG = data_reg; 562 led_func_ptr = led_LASI_driver; 563 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 564 led_type = LED_NOLCD; 565 break; 566 567 case DISPLAY_MODEL_OLD_ASP: 568 LED_DATA_REG = data_reg; 569 led_func_ptr = led_ASP_driver; 570 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 571 LED_DATA_REG); 572 led_type = LED_NOLCD; 573 break; 574 575 default: 576 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 577 __FUNCTION__, lcd_info.model); 578 return 1; 579 } 580 581 /* mark the LCD/LED driver now as initialized and 582 * register to the reboot notifier chain */ 583 initialized++; 584 register_reboot_notifier(&led_notifier); 585 586 /* Ensure the work is queued */ 587 if (led_wq) { 588 queue_work(led_wq, &led_task); 589 } 590 591 return 0; 592 } 593 594 /* 595 ** register_led_regions() 596 ** 597 ** register_led_regions() registers the LCD/LED regions for /procfs. 598 ** At bootup - where the initialisation of the LCD/LED normally happens - 599 ** not all internal structures of request_region() are properly set up, 600 ** so that we delay the led-registration until after busdevices_init() 601 ** has been executed. 602 ** 603 */ 604 605 void __init register_led_regions(void) 606 { 607 switch (lcd_info.model) { 608 case DISPLAY_MODEL_LCD: 609 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 610 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 611 break; 612 case DISPLAY_MODEL_LASI: 613 case DISPLAY_MODEL_OLD_ASP: 614 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 615 break; 616 } 617 } 618 619 620 /* 621 ** 622 ** lcd_print() 623 ** 624 ** Displays the given string on the LCD-Display of newer machines. 625 ** lcd_print() disables/enables the timer-based led work queue to 626 ** avoid a race condition while writing the CMD/DATA register pair. 627 ** 628 */ 629 int lcd_print( char *str ) 630 { 631 int i; 632 633 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 634 return 0; 635 636 /* temporarily disable the led work task */ 637 if (led_wq) 638 cancel_rearming_delayed_workqueue(led_wq, &led_task); 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-queue the work */ 657 if (led_wq) { 658 queue_work(led_wq, &led_task); 659 } 660 661 return lcd_info.lcd_width; 662 } 663 664 /* 665 ** led_init() 666 ** 667 ** led_init() is called very early in the bootup-process from setup.c 668 ** and asks the PDC for an usable chassis LCD or LED. 669 ** If the PDC doesn't return any info, then the LED 670 ** is detected by lasi.c or asp.c and registered with the 671 ** above functions lasi_led_init() or asp_led_init(). 672 ** KittyHawk machines have often a buggy PDC, so that 673 ** we explicitly check for those machines here. 674 */ 675 676 int __init led_init(void) 677 { 678 struct pdc_chassis_info chassis_info; 679 int ret; 680 681 snprintf(lcd_text_default, sizeof(lcd_text_default), 682 "Linux %s", system_utsname.release); 683 684 /* Work around the buggy PDC of KittyHawk-machines */ 685 switch (CPU_HVERSION) { 686 case 0x580: /* KittyHawk DC2-100 (K100) */ 687 case 0x581: /* KittyHawk DC3-120 (K210) */ 688 case 0x582: /* KittyHawk DC3 100 (K400) */ 689 case 0x583: /* KittyHawk DC3 120 (K410) */ 690 case 0x58B: /* KittyHawk DC2 100 (K200) */ 691 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 692 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 693 goto found; /* use the preinitialized values of lcd_info */ 694 } 695 696 /* initialize the struct, so that we can check for valid return values */ 697 lcd_info.model = DISPLAY_MODEL_NONE; 698 chassis_info.actcnt = chassis_info.maxcnt = 0; 699 700 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 701 if (ret == PDC_OK) { 702 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 703 "lcd_width=%d, cmd_delay=%u,\n" 704 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 705 __FILE__, lcd_info.model, 706 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 707 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 708 lcd_info.lcd_width, lcd_info.min_cmd_delay, 709 __FILE__, sizeof(lcd_info), 710 chassis_info.actcnt, chassis_info.maxcnt)); 711 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 712 __FILE__, lcd_info.lcd_cmd_reg_addr, 713 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 714 lcd_info.reset_cmd2, lcd_info.act_enable )); 715 716 /* check the results. Some machines have a buggy PDC */ 717 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 718 goto not_found; 719 720 switch (lcd_info.model) { 721 case DISPLAY_MODEL_LCD: /* LCD display */ 722 if (chassis_info.actcnt < 723 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 724 goto not_found; 725 if (!lcd_info.act_enable) { 726 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 727 goto not_found; 728 } 729 break; 730 731 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 732 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 733 goto not_found; 734 735 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 736 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 737 goto not_found; 738 break; 739 740 default: 741 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 742 lcd_info.model); 743 goto not_found; 744 } /* switch() */ 745 746 found: 747 /* register the LCD/LED driver */ 748 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 749 return 0; 750 751 } else { /* if() */ 752 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 753 } 754 755 not_found: 756 lcd_info.model = DISPLAY_MODEL_NONE; 757 return 1; 758 } 759 760 #ifdef CONFIG_PROC_FS 761 module_init(led_create_procfs) 762 #endif 763