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 2001-2009 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/seq_file.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 60static int led_type __read_mostly = -1; 61static unsigned char lastleds; /* LED state from most recent update */ 62static unsigned int led_heartbeat __read_mostly = 1; 63static unsigned int led_diskio __read_mostly = 1; 64static unsigned int led_lanrxtx __read_mostly = 1; 65static char lcd_text[32] __read_mostly; 66static char lcd_text_default[32] __read_mostly; 67 68 69static struct workqueue_struct *led_wq; 70static void led_work_func(struct work_struct *); 71static DECLARE_DELAYED_WORK(led_task, led_work_func); 72 73#define DPRINTK(x) 74 75struct lcd_block { 76 unsigned char command; /* stores the command byte */ 77 unsigned char on; /* value for turning LED on */ 78 unsigned char off; /* value for turning LED off */ 79}; 80 81/* Structure returned by PDC_RETURN_CHASSIS_INFO */ 82/* NOTE: we use unsigned long:16 two times, since the following member 83 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ 84struct pdc_chassis_lcd_info_ret_block { 85 unsigned long model:16; /* DISPLAY_MODEL_XXXX */ 86 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ 87 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ 88 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ 89 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ 90 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ 91 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ 92 unsigned char act_enable; /* 0 = no activity (LCD only) */ 93 struct lcd_block heartbeat; 94 struct lcd_block disk_io; 95 struct lcd_block lan_rcv; 96 struct lcd_block lan_tx; 97 char _pad; 98}; 99 100 101/* LCD_CMD and LCD_DATA for KittyHawk machines */ 102#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ 103#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) 104 105/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's 106 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ 107static struct pdc_chassis_lcd_info_ret_block 108lcd_info __attribute__((aligned(8))) __read_mostly = 109{ 110 .model = DISPLAY_MODEL_LCD, 111 .lcd_width = 16, 112 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, 113 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, 114 .min_cmd_delay = 40, 115 .reset_cmd1 = 0x80, 116 .reset_cmd2 = 0xc0, 117}; 118 119 120/* direct access to some of the lcd_info variables */ 121#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr 122#define LCD_DATA_REG lcd_info.lcd_data_reg_addr 123#define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ 124 125#define LED_HASLCD 1 126#define LED_NOLCD 0 127 128/* The workqueue must be created at init-time */ 129static int start_task(void) 130{ 131 /* Display the default text now */ 132 if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); 133 134 /* Create the work queue and queue the LED task */ 135 led_wq = create_singlethread_workqueue("led_wq"); 136 queue_delayed_work(led_wq, &led_task, 0); 137 138 return 0; 139} 140 141device_initcall(start_task); 142 143/* ptr to LCD/LED-specific function */ 144static void (*led_func_ptr) (unsigned char) __read_mostly; 145 146#ifdef CONFIG_PROC_FS 147static int led_proc_show(struct seq_file *m, void *v) 148{ 149 switch ((long)m->private) 150 { 151 case LED_NOLCD: 152 seq_printf(m, "Heartbeat: %d\n", led_heartbeat); 153 seq_printf(m, "Disk IO: %d\n", led_diskio); 154 seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx); 155 break; 156 case LED_HASLCD: 157 seq_printf(m, "%s\n", lcd_text); 158 break; 159 default: 160 return 0; 161 } 162 return 0; 163} 164 165static int led_proc_open(struct inode *inode, struct file *file) 166{ 167 return single_open(file, led_proc_show, PDE(inode)->data); 168} 169 170 171static ssize_t led_proc_write(struct file *file, const char *buf, 172 size_t count, loff_t *pos) 173{ 174 void *data = PDE(file->f_path.dentry->d_inode)->data; 175 char *cur, lbuf[32]; 176 int d; 177 178 if (!capable(CAP_SYS_ADMIN)) 179 return -EACCES; 180 181 if (count >= sizeof(lbuf)) 182 count = sizeof(lbuf)-1; 183 184 if (copy_from_user(lbuf, buf, count)) 185 return -EFAULT; 186 lbuf[count] = 0; 187 188 cur = lbuf; 189 190 switch ((long)data) 191 { 192 case LED_NOLCD: 193 d = *cur++ - '0'; 194 if (d != 0 && d != 1) goto parse_error; 195 led_heartbeat = d; 196 197 if (*cur++ != ' ') goto parse_error; 198 199 d = *cur++ - '0'; 200 if (d != 0 && d != 1) goto parse_error; 201 led_diskio = d; 202 203 if (*cur++ != ' ') goto parse_error; 204 205 d = *cur++ - '0'; 206 if (d != 0 && d != 1) goto parse_error; 207 led_lanrxtx = d; 208 209 break; 210 case LED_HASLCD: 211 if (*cur && cur[strlen(cur)-1] == '\n') 212 cur[strlen(cur)-1] = 0; 213 if (*cur == 0) 214 cur = lcd_text_default; 215 lcd_print(cur); 216 break; 217 default: 218 return 0; 219 } 220 221 return count; 222 223parse_error: 224 if ((long)data == LED_NOLCD) 225 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 226 return -EINVAL; 227} 228 229static const struct file_operations led_proc_fops = { 230 .owner = THIS_MODULE, 231 .open = led_proc_open, 232 .read = seq_read, 233 .llseek = seq_lseek, 234 .release = single_release, 235 .write = led_proc_write, 236}; 237 238static int __init led_create_procfs(void) 239{ 240 struct proc_dir_entry *proc_pdc_root = NULL; 241 struct proc_dir_entry *ent; 242 243 if (led_type == -1) return -1; 244 245 proc_pdc_root = proc_mkdir("pdc", 0); 246 if (!proc_pdc_root) return -1; 247 ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, 248 &led_proc_fops, (void *)LED_NOLCD); /* LED */ 249 if (!ent) return -1; 250 251 if (led_type == LED_HASLCD) 252 { 253 ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, 254 &led_proc_fops, (void *)LED_HASLCD); /* LCD */ 255 if (!ent) return -1; 256 } 257 258 return 0; 259} 260#endif 261 262/* 263 ** 264 ** led_ASP_driver() 265 ** 266 */ 267#define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 268#define LED_STROBE 0x02 /* strobe to clock data */ 269static void led_ASP_driver(unsigned char leds) 270{ 271 int i; 272 273 leds = ~leds; 274 for (i = 0; i < 8; i++) { 275 unsigned char value; 276 value = (leds & 0x80) >> 7; 277 gsc_writeb( value, LED_DATA_REG ); 278 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 279 leds <<= 1; 280 } 281} 282 283 284/* 285 ** 286 ** led_LASI_driver() 287 ** 288 */ 289static void led_LASI_driver(unsigned char leds) 290{ 291 leds = ~leds; 292 gsc_writeb( leds, LED_DATA_REG ); 293} 294 295 296/* 297 ** 298 ** led_LCD_driver() 299 ** 300 */ 301static void led_LCD_driver(unsigned char leds) 302{ 303 static int i; 304 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 305 LED_LAN_RCV, LED_LAN_TX }; 306 307 static struct lcd_block * blockp[4] = { 308 &lcd_info.heartbeat, 309 &lcd_info.disk_io, 310 &lcd_info.lan_rcv, 311 &lcd_info.lan_tx 312 }; 313 314 /* Convert min_cmd_delay to milliseconds */ 315 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 316 317 for (i=0; i<4; ++i) 318 { 319 if ((leds & mask[i]) != (lastleds & mask[i])) 320 { 321 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 322 msleep(msec_cmd_delay); 323 324 gsc_writeb( leds & mask[i] ? blockp[i]->on : 325 blockp[i]->off, LCD_DATA_REG ); 326 msleep(msec_cmd_delay); 327 } 328 } 329} 330 331 332/* 333 ** 334 ** led_get_net_activity() 335 ** 336 ** calculate if there was TX- or RX-throughput on the network interfaces 337 ** (analog to dev_get_info() from net/core/dev.c) 338 ** 339 */ 340static __inline__ int led_get_net_activity(void) 341{ 342#ifndef CONFIG_NET 343 return 0; 344#else 345 static unsigned long rx_total_last, tx_total_last; 346 unsigned long rx_total, tx_total; 347 struct net_device *dev; 348 int retval; 349 350 rx_total = tx_total = 0; 351 352 /* we are running as a workqueue task, so we can use an RCU lookup */ 353 rcu_read_lock(); 354 for_each_netdev_rcu(&init_net, dev) { 355 const struct net_device_stats *stats; 356 struct rtnl_link_stats64 temp; 357 struct in_device *in_dev = __in_dev_get_rcu(dev); 358 if (!in_dev || !in_dev->ifa_list) 359 continue; 360 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) 361 continue; 362 stats = dev_get_stats(dev, &temp); 363 rx_total += stats->rx_packets; 364 tx_total += stats->tx_packets; 365 } 366 rcu_read_unlock(); 367 368 retval = 0; 369 370 if (rx_total != rx_total_last) { 371 rx_total_last = rx_total; 372 retval |= LED_LAN_RCV; 373 } 374 375 if (tx_total != tx_total_last) { 376 tx_total_last = tx_total; 377 retval |= LED_LAN_TX; 378 } 379 380 return retval; 381#endif 382} 383 384 385/* 386 ** 387 ** led_get_diskio_activity() 388 ** 389 ** calculate if there was disk-io in the system 390 ** 391 */ 392static __inline__ int led_get_diskio_activity(void) 393{ 394 static unsigned long last_pgpgin, last_pgpgout; 395 unsigned long events[NR_VM_EVENT_ITEMS]; 396 int changed; 397 398 all_vm_events(events); 399 400 /* Just use a very simple calculation here. Do not care about overflow, 401 since we only want to know if there was activity or not. */ 402 changed = (events[PGPGIN] != last_pgpgin) || 403 (events[PGPGOUT] != last_pgpgout); 404 last_pgpgin = events[PGPGIN]; 405 last_pgpgout = events[PGPGOUT]; 406 407 return (changed ? LED_DISK_IO : 0); 408} 409 410 411 412/* 413 ** led_work_func() 414 ** 415 ** manages when and which chassis LCD/LED gets updated 416 417 TODO: 418 - display load average (older machines like 715/64 have 4 "free" LED's for that) 419 - optimizations 420 */ 421 422#define HEARTBEAT_LEN (HZ*10/100) 423#define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 424#define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 425 426#define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 427 428static void led_work_func (struct work_struct *unused) 429{ 430 static unsigned long last_jiffies; 431 static unsigned long count_HZ; /* counter in range 0..HZ */ 432 unsigned char currentleds = 0; /* stores current value of the LEDs */ 433 434 /* exit if not initialized */ 435 if (!led_func_ptr) 436 return; 437 438 /* increment the heartbeat timekeeper */ 439 count_HZ += jiffies - last_jiffies; 440 last_jiffies = jiffies; 441 if (count_HZ >= HZ) 442 count_HZ = 0; 443 444 if (likely(led_heartbeat)) 445 { 446 /* flash heartbeat-LED like a real heart 447 * (2 x short then a long delay) 448 */ 449 if (count_HZ < HEARTBEAT_LEN || 450 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 451 count_HZ < HEARTBEAT_2ND_RANGE_END)) 452 currentleds |= LED_HEARTBEAT; 453 } 454 455 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 456 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 457 458 /* blink LEDs if we got an Oops (HPMC) */ 459 if (unlikely(oops_in_progress)) { 460 if (boot_cpu_data.cpu_type >= pcxl2) { 461 /* newer machines don't have loadavg. LEDs, so we 462 * let all LEDs blink twice per second instead */ 463 currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; 464 } else { 465 /* old machines: blink loadavg. LEDs twice per second */ 466 if (count_HZ <= (HZ/2)) 467 currentleds &= ~(LED4|LED5|LED6|LED7); 468 else 469 currentleds |= (LED4|LED5|LED6|LED7); 470 } 471 } 472 473 if (currentleds != lastleds) 474 { 475 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 476 lastleds = currentleds; 477 } 478 479 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 480} 481 482/* 483 ** led_halt() 484 ** 485 ** called by the reboot notifier chain at shutdown and stops all 486 ** LED/LCD activities. 487 ** 488 */ 489 490static int led_halt(struct notifier_block *, unsigned long, void *); 491 492static struct notifier_block led_notifier = { 493 .notifier_call = led_halt, 494}; 495static int notifier_disabled = 0; 496 497static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 498{ 499 char *txt; 500 501 if (notifier_disabled) 502 return NOTIFY_OK; 503 504 notifier_disabled = 1; 505 switch (event) { 506 case SYS_RESTART: txt = "SYSTEM RESTART"; 507 break; 508 case SYS_HALT: txt = "SYSTEM HALT"; 509 break; 510 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 511 break; 512 default: return NOTIFY_DONE; 513 } 514 515 /* Cancel the work item and delete the queue */ 516 if (led_wq) { 517 cancel_delayed_work_sync(&led_task); 518 destroy_workqueue(led_wq); 519 led_wq = NULL; 520 } 521 522 if (lcd_info.model == DISPLAY_MODEL_LCD) 523 lcd_print(txt); 524 else 525 if (led_func_ptr) 526 led_func_ptr(0xff); /* turn all LEDs ON */ 527 528 return NOTIFY_OK; 529} 530 531/* 532 ** register_led_driver() 533 ** 534 ** registers an external LED or LCD for usage by this driver. 535 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 536 ** 537 */ 538 539int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 540{ 541 static int initialized; 542 543 if (initialized || !data_reg) 544 return 1; 545 546 lcd_info.model = model; /* store the values */ 547 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 548 549 switch (lcd_info.model) { 550 case DISPLAY_MODEL_LCD: 551 LCD_DATA_REG = data_reg; 552 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 553 LCD_CMD_REG , LCD_DATA_REG); 554 led_func_ptr = led_LCD_driver; 555 led_type = LED_HASLCD; 556 break; 557 558 case DISPLAY_MODEL_LASI: 559 LED_DATA_REG = data_reg; 560 led_func_ptr = led_LASI_driver; 561 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 562 led_type = LED_NOLCD; 563 break; 564 565 case DISPLAY_MODEL_OLD_ASP: 566 LED_DATA_REG = data_reg; 567 led_func_ptr = led_ASP_driver; 568 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 569 LED_DATA_REG); 570 led_type = LED_NOLCD; 571 break; 572 573 default: 574 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 575 __func__, lcd_info.model); 576 return 1; 577 } 578 579 /* mark the LCD/LED driver now as initialized and 580 * register to the reboot notifier chain */ 581 initialized++; 582 register_reboot_notifier(&led_notifier); 583 584 /* Ensure the work is queued */ 585 if (led_wq) { 586 queue_delayed_work(led_wq, &led_task, 0); 587 } 588 589 return 0; 590} 591 592/* 593 ** register_led_regions() 594 ** 595 ** register_led_regions() registers the LCD/LED regions for /procfs. 596 ** At bootup - where the initialisation of the LCD/LED normally happens - 597 ** not all internal structures of request_region() are properly set up, 598 ** so that we delay the led-registration until after busdevices_init() 599 ** has been executed. 600 ** 601 */ 602 603void __init register_led_regions(void) 604{ 605 switch (lcd_info.model) { 606 case DISPLAY_MODEL_LCD: 607 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 608 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 609 break; 610 case DISPLAY_MODEL_LASI: 611 case DISPLAY_MODEL_OLD_ASP: 612 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 613 break; 614 } 615} 616 617 618/* 619 ** 620 ** lcd_print() 621 ** 622 ** Displays the given string on the LCD-Display of newer machines. 623 ** lcd_print() disables/enables the timer-based led work queue to 624 ** avoid a race condition while writing the CMD/DATA register pair. 625 ** 626 */ 627int lcd_print( const char *str ) 628{ 629 int i; 630 631 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 632 return 0; 633 634 /* temporarily disable the led work task */ 635 if (led_wq) 636 cancel_delayed_work_sync(&led_task); 637 638 /* copy display string to buffer for procfs */ 639 strlcpy(lcd_text, str, sizeof(lcd_text)); 640 641 /* Set LCD Cursor to 1st character */ 642 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 643 udelay(lcd_info.min_cmd_delay); 644 645 /* Print the string */ 646 for (i=0; i < lcd_info.lcd_width; i++) { 647 if (str && *str) 648 gsc_writeb(*str++, LCD_DATA_REG); 649 else 650 gsc_writeb(' ', LCD_DATA_REG); 651 udelay(lcd_info.min_cmd_delay); 652 } 653 654 /* re-queue the work */ 655 if (led_wq) { 656 queue_delayed_work(led_wq, &led_task, 0); 657 } 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 674int __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", init_utsname()->release); 681 682 switch (CPU_HVERSION) { 683 case 0x580: /* KittyHawk DC2-100 (K100) */ 684 case 0x581: /* KittyHawk DC3-120 (K210) */ 685 case 0x582: /* KittyHawk DC3 100 (K400) */ 686 case 0x583: /* KittyHawk DC3 120 (K410) */ 687 case 0x58B: /* KittyHawk DC2 100 (K200) */ 688 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 689 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 690 goto found; /* use the preinitialized values of lcd_info */ 691 } 692 693 /* initialize the struct, so that we can check for valid return values */ 694 lcd_info.model = DISPLAY_MODEL_NONE; 695 chassis_info.actcnt = chassis_info.maxcnt = 0; 696 697 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 698 if (ret == PDC_OK) { 699 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 700 "lcd_width=%d, cmd_delay=%u,\n" 701 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 702 __FILE__, lcd_info.model, 703 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 704 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 705 lcd_info.lcd_width, lcd_info.min_cmd_delay, 706 __FILE__, sizeof(lcd_info), 707 chassis_info.actcnt, chassis_info.maxcnt)); 708 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 709 __FILE__, lcd_info.lcd_cmd_reg_addr, 710 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 711 lcd_info.reset_cmd2, lcd_info.act_enable )); 712 713 /* check the results. Some machines have a buggy PDC */ 714 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 715 goto not_found; 716 717 switch (lcd_info.model) { 718 case DISPLAY_MODEL_LCD: /* LCD display */ 719 if (chassis_info.actcnt < 720 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 721 goto not_found; 722 if (!lcd_info.act_enable) { 723 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 724 goto not_found; 725 } 726 break; 727 728 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 729 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 730 goto not_found; 731 732 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 733 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 734 goto not_found; 735 break; 736 737 default: 738 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 739 lcd_info.model); 740 goto not_found; 741 } /* switch() */ 742 743found: 744 /* register the LCD/LED driver */ 745 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 746 return 0; 747 748 } else { /* if() */ 749 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 750 } 751 752not_found: 753 lcd_info.model = DISPLAY_MODEL_NONE; 754 return 1; 755} 756 757static void __exit led_exit(void) 758{ 759 unregister_reboot_notifier(&led_notifier); 760 return; 761} 762 763#ifdef CONFIG_PROC_FS 764module_init(led_create_procfs) 765#endif 766