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 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(struct work_struct *); 71 static DECLARE_DELAYED_WORK(led_task, led_work_func); 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_delayed_work(led_wq, &led_task, 0); 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_show(struct seq_file *m, void *v) 152 { 153 switch ((long)m->private) 154 { 155 case LED_NOLCD: 156 seq_printf(m, "Heartbeat: %d\n", led_heartbeat); 157 seq_printf(m, "Disk IO: %d\n", led_diskio); 158 seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx); 159 break; 160 case LED_HASLCD: 161 seq_printf(m, "%s\n", lcd_text); 162 break; 163 default: 164 return 0; 165 } 166 return 0; 167 } 168 169 static int led_proc_open(struct inode *inode, struct file *file) 170 { 171 return single_open(file, led_proc_show, PDE(inode)->data); 172 } 173 174 175 static ssize_t led_proc_write(struct file *file, const char *buf, 176 size_t count, loff_t *pos) 177 { 178 void *data = PDE(file->f_path.dentry->d_inode)->data; 179 char *cur, lbuf[count + 1]; 180 int d; 181 182 if (!capable(CAP_SYS_ADMIN)) 183 return -EACCES; 184 185 memset(lbuf, 0, count + 1); 186 187 if (copy_from_user(lbuf, buf, count)) 188 return -EFAULT; 189 190 cur = lbuf; 191 192 switch ((long)data) 193 { 194 case LED_NOLCD: 195 d = *cur++ - '0'; 196 if (d != 0 && d != 1) goto parse_error; 197 led_heartbeat = d; 198 199 if (*cur++ != ' ') goto parse_error; 200 201 d = *cur++ - '0'; 202 if (d != 0 && d != 1) goto parse_error; 203 led_diskio = d; 204 205 if (*cur++ != ' ') goto parse_error; 206 207 d = *cur++ - '0'; 208 if (d != 0 && d != 1) goto parse_error; 209 led_lanrxtx = d; 210 211 break; 212 case LED_HASLCD: 213 if (*cur && cur[strlen(cur)-1] == '\n') 214 cur[strlen(cur)-1] = 0; 215 if (*cur == 0) 216 cur = lcd_text_default; 217 lcd_print(cur); 218 break; 219 default: 220 return 0; 221 } 222 223 return count; 224 225 parse_error: 226 if ((long)data == LED_NOLCD) 227 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 228 return -EINVAL; 229 } 230 231 static const struct file_operations led_proc_fops = { 232 .owner = THIS_MODULE, 233 .open = led_proc_open, 234 .read = seq_read, 235 .llseek = seq_lseek, 236 .release = single_release, 237 .write = led_proc_write, 238 }; 239 240 static int __init led_create_procfs(void) 241 { 242 struct proc_dir_entry *proc_pdc_root = NULL; 243 struct proc_dir_entry *ent; 244 245 if (led_type == -1) return -1; 246 247 proc_pdc_root = proc_mkdir("pdc", 0); 248 if (!proc_pdc_root) return -1; 249 ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, 250 &led_proc_fops, (void *)LED_NOLCD); /* LED */ 251 if (!ent) return -1; 252 253 if (led_type == LED_HASLCD) 254 { 255 ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, 256 &led_proc_fops, (void *)LED_HASLCD); /* LCD */ 257 if (!ent) return -1; 258 } 259 260 return 0; 261 } 262 #endif 263 264 /* 265 ** 266 ** led_ASP_driver() 267 ** 268 */ 269 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 270 #define LED_STROBE 0x02 /* strobe to clock data */ 271 static void led_ASP_driver(unsigned char leds) 272 { 273 int i; 274 275 leds = ~leds; 276 for (i = 0; i < 8; i++) { 277 unsigned char value; 278 value = (leds & 0x80) >> 7; 279 gsc_writeb( value, LED_DATA_REG ); 280 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 281 leds <<= 1; 282 } 283 } 284 285 286 /* 287 ** 288 ** led_LASI_driver() 289 ** 290 */ 291 static void led_LASI_driver(unsigned char leds) 292 { 293 leds = ~leds; 294 gsc_writeb( leds, LED_DATA_REG ); 295 } 296 297 298 /* 299 ** 300 ** led_LCD_driver() 301 ** 302 */ 303 static void led_LCD_driver(unsigned char leds) 304 { 305 static int i; 306 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 307 LED_LAN_RCV, LED_LAN_TX }; 308 309 static struct lcd_block * blockp[4] = { 310 &lcd_info.heartbeat, 311 &lcd_info.disk_io, 312 &lcd_info.lan_rcv, 313 &lcd_info.lan_tx 314 }; 315 316 /* Convert min_cmd_delay to milliseconds */ 317 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 318 319 for (i=0; i<4; ++i) 320 { 321 if ((leds & mask[i]) != (lastleds & mask[i])) 322 { 323 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 324 msleep(msec_cmd_delay); 325 326 gsc_writeb( leds & mask[i] ? blockp[i]->on : 327 blockp[i]->off, LCD_DATA_REG ); 328 msleep(msec_cmd_delay); 329 } 330 } 331 } 332 333 334 /* 335 ** 336 ** led_get_net_activity() 337 ** 338 ** calculate if there was TX- or RX-throughput on the network interfaces 339 ** (analog to dev_get_info() from net/core/dev.c) 340 ** 341 */ 342 static __inline__ int led_get_net_activity(void) 343 { 344 #ifndef CONFIG_NET 345 return 0; 346 #else 347 static unsigned long rx_total_last, tx_total_last; 348 unsigned long rx_total, tx_total; 349 struct net_device *dev; 350 int retval; 351 352 rx_total = tx_total = 0; 353 354 /* we are running as a workqueue task, so we can use an RCU lookup */ 355 rcu_read_lock(); 356 for_each_netdev_rcu(&init_net, dev) { 357 const struct net_device_stats *stats; 358 struct in_device *in_dev = __in_dev_get_rcu(dev); 359 if (!in_dev || !in_dev->ifa_list) 360 continue; 361 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) 362 continue; 363 stats = dev_get_stats(dev); 364 rx_total += stats->rx_packets; 365 tx_total += stats->tx_packets; 366 } 367 rcu_read_unlock(); 368 369 retval = 0; 370 371 if (rx_total != rx_total_last) { 372 rx_total_last = rx_total; 373 retval |= LED_LAN_RCV; 374 } 375 376 if (tx_total != tx_total_last) { 377 tx_total_last = tx_total; 378 retval |= LED_LAN_TX; 379 } 380 381 return retval; 382 #endif 383 } 384 385 386 /* 387 ** 388 ** led_get_diskio_activity() 389 ** 390 ** calculate if there was disk-io in the system 391 ** 392 */ 393 static __inline__ int led_get_diskio_activity(void) 394 { 395 static unsigned long last_pgpgin, last_pgpgout; 396 unsigned long events[NR_VM_EVENT_ITEMS]; 397 int changed; 398 399 all_vm_events(events); 400 401 /* Just use a very simple calculation here. Do not care about overflow, 402 since we only want to know if there was activity or not. */ 403 changed = (events[PGPGIN] != last_pgpgin) || 404 (events[PGPGOUT] != last_pgpgout); 405 last_pgpgin = events[PGPGIN]; 406 last_pgpgout = events[PGPGOUT]; 407 408 return (changed ? LED_DISK_IO : 0); 409 } 410 411 412 413 /* 414 ** led_work_func() 415 ** 416 ** manages when and which chassis LCD/LED gets updated 417 418 TODO: 419 - display load average (older machines like 715/64 have 4 "free" LED's for that) 420 - optimizations 421 */ 422 423 #define HEARTBEAT_LEN (HZ*10/100) 424 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 425 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 426 427 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 428 429 static void led_work_func (struct work_struct *unused) 430 { 431 static unsigned long last_jiffies; 432 static unsigned long count_HZ; /* counter in range 0..HZ */ 433 unsigned char currentleds = 0; /* stores current value of the LEDs */ 434 435 /* exit if not initialized */ 436 if (!led_func_ptr) 437 return; 438 439 /* increment the heartbeat timekeeper */ 440 count_HZ += jiffies - last_jiffies; 441 last_jiffies = jiffies; 442 if (count_HZ >= HZ) 443 count_HZ = 0; 444 445 if (likely(led_heartbeat)) 446 { 447 /* flash heartbeat-LED like a real heart 448 * (2 x short then a long delay) 449 */ 450 if (count_HZ < HEARTBEAT_LEN || 451 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 452 count_HZ < HEARTBEAT_2ND_RANGE_END)) 453 currentleds |= LED_HEARTBEAT; 454 } 455 456 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 457 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 458 459 /* blink LEDs if we got an Oops (HPMC) */ 460 if (unlikely(oops_in_progress)) { 461 if (boot_cpu_data.cpu_type >= pcxl2) { 462 /* newer machines don't have loadavg. LEDs, so we 463 * let all LEDs blink twice per second instead */ 464 currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; 465 } else { 466 /* old machines: blink loadavg. LEDs twice per second */ 467 if (count_HZ <= (HZ/2)) 468 currentleds &= ~(LED4|LED5|LED6|LED7); 469 else 470 currentleds |= (LED4|LED5|LED6|LED7); 471 } 472 } 473 474 if (currentleds != lastleds) 475 { 476 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 477 lastleds = currentleds; 478 } 479 480 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 481 } 482 483 /* 484 ** led_halt() 485 ** 486 ** called by the reboot notifier chain at shutdown and stops all 487 ** LED/LCD activities. 488 ** 489 */ 490 491 static int led_halt(struct notifier_block *, unsigned long, void *); 492 493 static struct notifier_block led_notifier = { 494 .notifier_call = led_halt, 495 }; 496 static int notifier_disabled = 0; 497 498 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 499 { 500 char *txt; 501 502 if (notifier_disabled) 503 return NOTIFY_OK; 504 505 notifier_disabled = 1; 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_delayed_work_sync(&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 return NOTIFY_OK; 530 } 531 532 /* 533 ** register_led_driver() 534 ** 535 ** registers an external LED or LCD for usage by this driver. 536 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 537 ** 538 */ 539 540 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 541 { 542 static int initialized; 543 544 if (initialized || !data_reg) 545 return 1; 546 547 lcd_info.model = model; /* store the values */ 548 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 549 550 switch (lcd_info.model) { 551 case DISPLAY_MODEL_LCD: 552 LCD_DATA_REG = data_reg; 553 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 554 LCD_CMD_REG , LCD_DATA_REG); 555 led_func_ptr = led_LCD_driver; 556 led_type = LED_HASLCD; 557 break; 558 559 case DISPLAY_MODEL_LASI: 560 LED_DATA_REG = data_reg; 561 led_func_ptr = led_LASI_driver; 562 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 563 led_type = LED_NOLCD; 564 break; 565 566 case DISPLAY_MODEL_OLD_ASP: 567 LED_DATA_REG = data_reg; 568 led_func_ptr = led_ASP_driver; 569 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 570 LED_DATA_REG); 571 led_type = LED_NOLCD; 572 break; 573 574 default: 575 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 576 __func__, lcd_info.model); 577 return 1; 578 } 579 580 /* mark the LCD/LED driver now as initialized and 581 * register to the reboot notifier chain */ 582 initialized++; 583 register_reboot_notifier(&led_notifier); 584 585 /* Ensure the work is queued */ 586 if (led_wq) { 587 queue_delayed_work(led_wq, &led_task, 0); 588 } 589 590 return 0; 591 } 592 593 /* 594 ** register_led_regions() 595 ** 596 ** register_led_regions() registers the LCD/LED regions for /procfs. 597 ** At bootup - where the initialisation of the LCD/LED normally happens - 598 ** not all internal structures of request_region() are properly set up, 599 ** so that we delay the led-registration until after busdevices_init() 600 ** has been executed. 601 ** 602 */ 603 604 void __init register_led_regions(void) 605 { 606 switch (lcd_info.model) { 607 case DISPLAY_MODEL_LCD: 608 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 609 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 610 break; 611 case DISPLAY_MODEL_LASI: 612 case DISPLAY_MODEL_OLD_ASP: 613 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 614 break; 615 } 616 } 617 618 619 /* 620 ** 621 ** lcd_print() 622 ** 623 ** Displays the given string on the LCD-Display of newer machines. 624 ** lcd_print() disables/enables the timer-based led work queue to 625 ** avoid a race condition while writing the CMD/DATA register pair. 626 ** 627 */ 628 int lcd_print( const char *str ) 629 { 630 int i; 631 632 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 633 return 0; 634 635 /* temporarily disable the led work task */ 636 if (led_wq) 637 cancel_delayed_work_sync(&led_task); 638 639 /* copy display string to buffer for procfs */ 640 strlcpy(lcd_text, str, sizeof(lcd_text)); 641 642 /* Set LCD Cursor to 1st character */ 643 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 644 udelay(lcd_info.min_cmd_delay); 645 646 /* Print the string */ 647 for (i=0; i < lcd_info.lcd_width; i++) { 648 if (str && *str) 649 gsc_writeb(*str++, LCD_DATA_REG); 650 else 651 gsc_writeb(' ', LCD_DATA_REG); 652 udelay(lcd_info.min_cmd_delay); 653 } 654 655 /* re-queue the work */ 656 if (led_wq) { 657 queue_delayed_work(led_wq, &led_task, 0); 658 } 659 660 return lcd_info.lcd_width; 661 } 662 663 /* 664 ** led_init() 665 ** 666 ** led_init() is called very early in the bootup-process from setup.c 667 ** and asks the PDC for an usable chassis LCD or LED. 668 ** If the PDC doesn't return any info, then the LED 669 ** is detected by lasi.c or asp.c and registered with the 670 ** above functions lasi_led_init() or asp_led_init(). 671 ** KittyHawk machines have often a buggy PDC, so that 672 ** we explicitly check for those machines here. 673 */ 674 675 int __init led_init(void) 676 { 677 struct pdc_chassis_info chassis_info; 678 int ret; 679 680 snprintf(lcd_text_default, sizeof(lcd_text_default), 681 "Linux %s", init_utsname()->release); 682 683 /* Work around the buggy PDC of KittyHawk-machines */ 684 switch (CPU_HVERSION) { 685 case 0x580: /* KittyHawk DC2-100 (K100) */ 686 case 0x581: /* KittyHawk DC3-120 (K210) */ 687 case 0x582: /* KittyHawk DC3 100 (K400) */ 688 case 0x583: /* KittyHawk DC3 120 (K410) */ 689 case 0x58B: /* KittyHawk DC2 100 (K200) */ 690 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 691 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 692 goto found; /* use the preinitialized values of lcd_info */ 693 } 694 695 /* initialize the struct, so that we can check for valid return values */ 696 lcd_info.model = DISPLAY_MODEL_NONE; 697 chassis_info.actcnt = chassis_info.maxcnt = 0; 698 699 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 700 if (ret == PDC_OK) { 701 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 702 "lcd_width=%d, cmd_delay=%u,\n" 703 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 704 __FILE__, lcd_info.model, 705 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 706 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 707 lcd_info.lcd_width, lcd_info.min_cmd_delay, 708 __FILE__, sizeof(lcd_info), 709 chassis_info.actcnt, chassis_info.maxcnt)); 710 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 711 __FILE__, lcd_info.lcd_cmd_reg_addr, 712 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 713 lcd_info.reset_cmd2, lcd_info.act_enable )); 714 715 /* check the results. Some machines have a buggy PDC */ 716 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 717 goto not_found; 718 719 switch (lcd_info.model) { 720 case DISPLAY_MODEL_LCD: /* LCD display */ 721 if (chassis_info.actcnt < 722 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 723 goto not_found; 724 if (!lcd_info.act_enable) { 725 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 726 goto not_found; 727 } 728 break; 729 730 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 731 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 732 goto not_found; 733 734 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 735 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 736 goto not_found; 737 break; 738 739 default: 740 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 741 lcd_info.model); 742 goto not_found; 743 } /* switch() */ 744 745 found: 746 /* register the LCD/LED driver */ 747 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 748 return 0; 749 750 } else { /* if() */ 751 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 752 } 753 754 not_found: 755 lcd_info.model = DISPLAY_MODEL_NONE; 756 return 1; 757 } 758 759 static void __exit led_exit(void) 760 { 761 unregister_reboot_notifier(&led_notifier); 762 return; 763 } 764 765 #ifdef CONFIG_PROC_FS 766 module_init(led_create_procfs) 767 #endif 768