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[32]; 180 int d; 181 182 if (!capable(CAP_SYS_ADMIN)) 183 return -EACCES; 184 185 if (count >= sizeof(lbuf)) 186 count = sizeof(lbuf)-1; 187 188 if (copy_from_user(lbuf, buf, count)) 189 return -EFAULT; 190 lbuf[count] = 0; 191 192 cur = lbuf; 193 194 switch ((long)data) 195 { 196 case LED_NOLCD: 197 d = *cur++ - '0'; 198 if (d != 0 && d != 1) goto parse_error; 199 led_heartbeat = d; 200 201 if (*cur++ != ' ') goto parse_error; 202 203 d = *cur++ - '0'; 204 if (d != 0 && d != 1) goto parse_error; 205 led_diskio = d; 206 207 if (*cur++ != ' ') goto parse_error; 208 209 d = *cur++ - '0'; 210 if (d != 0 && d != 1) goto parse_error; 211 led_lanrxtx = d; 212 213 break; 214 case LED_HASLCD: 215 if (*cur && cur[strlen(cur)-1] == '\n') 216 cur[strlen(cur)-1] = 0; 217 if (*cur == 0) 218 cur = lcd_text_default; 219 lcd_print(cur); 220 break; 221 default: 222 return 0; 223 } 224 225 return count; 226 227 parse_error: 228 if ((long)data == LED_NOLCD) 229 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); 230 return -EINVAL; 231 } 232 233 static const struct file_operations led_proc_fops = { 234 .owner = THIS_MODULE, 235 .open = led_proc_open, 236 .read = seq_read, 237 .llseek = seq_lseek, 238 .release = single_release, 239 .write = led_proc_write, 240 }; 241 242 static int __init led_create_procfs(void) 243 { 244 struct proc_dir_entry *proc_pdc_root = NULL; 245 struct proc_dir_entry *ent; 246 247 if (led_type == -1) return -1; 248 249 proc_pdc_root = proc_mkdir("pdc", 0); 250 if (!proc_pdc_root) return -1; 251 ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, 252 &led_proc_fops, (void *)LED_NOLCD); /* LED */ 253 if (!ent) return -1; 254 255 if (led_type == LED_HASLCD) 256 { 257 ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, 258 &led_proc_fops, (void *)LED_HASLCD); /* LCD */ 259 if (!ent) return -1; 260 } 261 262 return 0; 263 } 264 #endif 265 266 /* 267 ** 268 ** led_ASP_driver() 269 ** 270 */ 271 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ 272 #define LED_STROBE 0x02 /* strobe to clock data */ 273 static void led_ASP_driver(unsigned char leds) 274 { 275 int i; 276 277 leds = ~leds; 278 for (i = 0; i < 8; i++) { 279 unsigned char value; 280 value = (leds & 0x80) >> 7; 281 gsc_writeb( value, LED_DATA_REG ); 282 gsc_writeb( value | LED_STROBE, LED_DATA_REG ); 283 leds <<= 1; 284 } 285 } 286 287 288 /* 289 ** 290 ** led_LASI_driver() 291 ** 292 */ 293 static void led_LASI_driver(unsigned char leds) 294 { 295 leds = ~leds; 296 gsc_writeb( leds, LED_DATA_REG ); 297 } 298 299 300 /* 301 ** 302 ** led_LCD_driver() 303 ** 304 */ 305 static void led_LCD_driver(unsigned char leds) 306 { 307 static int i; 308 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, 309 LED_LAN_RCV, LED_LAN_TX }; 310 311 static struct lcd_block * blockp[4] = { 312 &lcd_info.heartbeat, 313 &lcd_info.disk_io, 314 &lcd_info.lan_rcv, 315 &lcd_info.lan_tx 316 }; 317 318 /* Convert min_cmd_delay to milliseconds */ 319 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); 320 321 for (i=0; i<4; ++i) 322 { 323 if ((leds & mask[i]) != (lastleds & mask[i])) 324 { 325 gsc_writeb( blockp[i]->command, LCD_CMD_REG ); 326 msleep(msec_cmd_delay); 327 328 gsc_writeb( leds & mask[i] ? blockp[i]->on : 329 blockp[i]->off, LCD_DATA_REG ); 330 msleep(msec_cmd_delay); 331 } 332 } 333 } 334 335 336 /* 337 ** 338 ** led_get_net_activity() 339 ** 340 ** calculate if there was TX- or RX-throughput on the network interfaces 341 ** (analog to dev_get_info() from net/core/dev.c) 342 ** 343 */ 344 static __inline__ int led_get_net_activity(void) 345 { 346 #ifndef CONFIG_NET 347 return 0; 348 #else 349 static unsigned long rx_total_last, tx_total_last; 350 unsigned long rx_total, tx_total; 351 struct net_device *dev; 352 int retval; 353 354 rx_total = tx_total = 0; 355 356 /* we are running as a workqueue task, so we can use an RCU lookup */ 357 rcu_read_lock(); 358 for_each_netdev_rcu(&init_net, dev) { 359 const struct net_device_stats *stats; 360 struct rtnl_link_stats64 temp; 361 struct in_device *in_dev = __in_dev_get_rcu(dev); 362 if (!in_dev || !in_dev->ifa_list) 363 continue; 364 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) 365 continue; 366 stats = dev_get_stats(dev, &temp); 367 rx_total += stats->rx_packets; 368 tx_total += stats->tx_packets; 369 } 370 rcu_read_unlock(); 371 372 retval = 0; 373 374 if (rx_total != rx_total_last) { 375 rx_total_last = rx_total; 376 retval |= LED_LAN_RCV; 377 } 378 379 if (tx_total != tx_total_last) { 380 tx_total_last = tx_total; 381 retval |= LED_LAN_TX; 382 } 383 384 return retval; 385 #endif 386 } 387 388 389 /* 390 ** 391 ** led_get_diskio_activity() 392 ** 393 ** calculate if there was disk-io in the system 394 ** 395 */ 396 static __inline__ int led_get_diskio_activity(void) 397 { 398 static unsigned long last_pgpgin, last_pgpgout; 399 unsigned long events[NR_VM_EVENT_ITEMS]; 400 int changed; 401 402 all_vm_events(events); 403 404 /* Just use a very simple calculation here. Do not care about overflow, 405 since we only want to know if there was activity or not. */ 406 changed = (events[PGPGIN] != last_pgpgin) || 407 (events[PGPGOUT] != last_pgpgout); 408 last_pgpgin = events[PGPGIN]; 409 last_pgpgout = events[PGPGOUT]; 410 411 return (changed ? LED_DISK_IO : 0); 412 } 413 414 415 416 /* 417 ** led_work_func() 418 ** 419 ** manages when and which chassis LCD/LED gets updated 420 421 TODO: 422 - display load average (older machines like 715/64 have 4 "free" LED's for that) 423 - optimizations 424 */ 425 426 #define HEARTBEAT_LEN (HZ*10/100) 427 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) 428 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) 429 430 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) 431 432 static void led_work_func (struct work_struct *unused) 433 { 434 static unsigned long last_jiffies; 435 static unsigned long count_HZ; /* counter in range 0..HZ */ 436 unsigned char currentleds = 0; /* stores current value of the LEDs */ 437 438 /* exit if not initialized */ 439 if (!led_func_ptr) 440 return; 441 442 /* increment the heartbeat timekeeper */ 443 count_HZ += jiffies - last_jiffies; 444 last_jiffies = jiffies; 445 if (count_HZ >= HZ) 446 count_HZ = 0; 447 448 if (likely(led_heartbeat)) 449 { 450 /* flash heartbeat-LED like a real heart 451 * (2 x short then a long delay) 452 */ 453 if (count_HZ < HEARTBEAT_LEN || 454 (count_HZ >= HEARTBEAT_2ND_RANGE_START && 455 count_HZ < HEARTBEAT_2ND_RANGE_END)) 456 currentleds |= LED_HEARTBEAT; 457 } 458 459 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); 460 if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); 461 462 /* blink LEDs if we got an Oops (HPMC) */ 463 if (unlikely(oops_in_progress)) { 464 if (boot_cpu_data.cpu_type >= pcxl2) { 465 /* newer machines don't have loadavg. LEDs, so we 466 * let all LEDs blink twice per second instead */ 467 currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; 468 } else { 469 /* old machines: blink loadavg. LEDs twice per second */ 470 if (count_HZ <= (HZ/2)) 471 currentleds &= ~(LED4|LED5|LED6|LED7); 472 else 473 currentleds |= (LED4|LED5|LED6|LED7); 474 } 475 } 476 477 if (currentleds != lastleds) 478 { 479 led_func_ptr(currentleds); /* Update the LCD/LEDs */ 480 lastleds = currentleds; 481 } 482 483 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); 484 } 485 486 /* 487 ** led_halt() 488 ** 489 ** called by the reboot notifier chain at shutdown and stops all 490 ** LED/LCD activities. 491 ** 492 */ 493 494 static int led_halt(struct notifier_block *, unsigned long, void *); 495 496 static struct notifier_block led_notifier = { 497 .notifier_call = led_halt, 498 }; 499 static int notifier_disabled = 0; 500 501 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) 502 { 503 char *txt; 504 505 if (notifier_disabled) 506 return NOTIFY_OK; 507 508 notifier_disabled = 1; 509 switch (event) { 510 case SYS_RESTART: txt = "SYSTEM RESTART"; 511 break; 512 case SYS_HALT: txt = "SYSTEM HALT"; 513 break; 514 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; 515 break; 516 default: return NOTIFY_DONE; 517 } 518 519 /* Cancel the work item and delete the queue */ 520 if (led_wq) { 521 cancel_delayed_work_sync(&led_task); 522 destroy_workqueue(led_wq); 523 led_wq = NULL; 524 } 525 526 if (lcd_info.model == DISPLAY_MODEL_LCD) 527 lcd_print(txt); 528 else 529 if (led_func_ptr) 530 led_func_ptr(0xff); /* turn all LEDs ON */ 531 532 return NOTIFY_OK; 533 } 534 535 /* 536 ** register_led_driver() 537 ** 538 ** registers an external LED or LCD for usage by this driver. 539 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. 540 ** 541 */ 542 543 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) 544 { 545 static int initialized; 546 547 if (initialized || !data_reg) 548 return 1; 549 550 lcd_info.model = model; /* store the values */ 551 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; 552 553 switch (lcd_info.model) { 554 case DISPLAY_MODEL_LCD: 555 LCD_DATA_REG = data_reg; 556 printk(KERN_INFO "LCD display at %lx,%lx registered\n", 557 LCD_CMD_REG , LCD_DATA_REG); 558 led_func_ptr = led_LCD_driver; 559 led_type = LED_HASLCD; 560 break; 561 562 case DISPLAY_MODEL_LASI: 563 LED_DATA_REG = data_reg; 564 led_func_ptr = led_LASI_driver; 565 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); 566 led_type = LED_NOLCD; 567 break; 568 569 case DISPLAY_MODEL_OLD_ASP: 570 LED_DATA_REG = data_reg; 571 led_func_ptr = led_ASP_driver; 572 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", 573 LED_DATA_REG); 574 led_type = LED_NOLCD; 575 break; 576 577 default: 578 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", 579 __func__, lcd_info.model); 580 return 1; 581 } 582 583 /* mark the LCD/LED driver now as initialized and 584 * register to the reboot notifier chain */ 585 initialized++; 586 register_reboot_notifier(&led_notifier); 587 588 /* Ensure the work is queued */ 589 if (led_wq) { 590 queue_delayed_work(led_wq, &led_task, 0); 591 } 592 593 return 0; 594 } 595 596 /* 597 ** register_led_regions() 598 ** 599 ** register_led_regions() registers the LCD/LED regions for /procfs. 600 ** At bootup - where the initialisation of the LCD/LED normally happens - 601 ** not all internal structures of request_region() are properly set up, 602 ** so that we delay the led-registration until after busdevices_init() 603 ** has been executed. 604 ** 605 */ 606 607 void __init register_led_regions(void) 608 { 609 switch (lcd_info.model) { 610 case DISPLAY_MODEL_LCD: 611 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); 612 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); 613 break; 614 case DISPLAY_MODEL_LASI: 615 case DISPLAY_MODEL_OLD_ASP: 616 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); 617 break; 618 } 619 } 620 621 622 /* 623 ** 624 ** lcd_print() 625 ** 626 ** Displays the given string on the LCD-Display of newer machines. 627 ** lcd_print() disables/enables the timer-based led work queue to 628 ** avoid a race condition while writing the CMD/DATA register pair. 629 ** 630 */ 631 int lcd_print( const char *str ) 632 { 633 int i; 634 635 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) 636 return 0; 637 638 /* temporarily disable the led work task */ 639 if (led_wq) 640 cancel_delayed_work_sync(&led_task); 641 642 /* copy display string to buffer for procfs */ 643 strlcpy(lcd_text, str, sizeof(lcd_text)); 644 645 /* Set LCD Cursor to 1st character */ 646 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); 647 udelay(lcd_info.min_cmd_delay); 648 649 /* Print the string */ 650 for (i=0; i < lcd_info.lcd_width; i++) { 651 if (str && *str) 652 gsc_writeb(*str++, LCD_DATA_REG); 653 else 654 gsc_writeb(' ', LCD_DATA_REG); 655 udelay(lcd_info.min_cmd_delay); 656 } 657 658 /* re-queue the work */ 659 if (led_wq) { 660 queue_delayed_work(led_wq, &led_task, 0); 661 } 662 663 return lcd_info.lcd_width; 664 } 665 666 /* 667 ** led_init() 668 ** 669 ** led_init() is called very early in the bootup-process from setup.c 670 ** and asks the PDC for an usable chassis LCD or LED. 671 ** If the PDC doesn't return any info, then the LED 672 ** is detected by lasi.c or asp.c and registered with the 673 ** above functions lasi_led_init() or asp_led_init(). 674 ** KittyHawk machines have often a buggy PDC, so that 675 ** we explicitly check for those machines here. 676 */ 677 678 int __init led_init(void) 679 { 680 struct pdc_chassis_info chassis_info; 681 int ret; 682 683 snprintf(lcd_text_default, sizeof(lcd_text_default), 684 "Linux %s", init_utsname()->release); 685 686 /* Work around the buggy PDC of KittyHawk-machines */ 687 switch (CPU_HVERSION) { 688 case 0x580: /* KittyHawk DC2-100 (K100) */ 689 case 0x581: /* KittyHawk DC3-120 (K210) */ 690 case 0x582: /* KittyHawk DC3 100 (K400) */ 691 case 0x583: /* KittyHawk DC3 120 (K410) */ 692 case 0x58B: /* KittyHawk DC2 100 (K200) */ 693 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " 694 "LED detection skipped.\n", __FILE__, CPU_HVERSION); 695 goto found; /* use the preinitialized values of lcd_info */ 696 } 697 698 /* initialize the struct, so that we can check for valid return values */ 699 lcd_info.model = DISPLAY_MODEL_NONE; 700 chassis_info.actcnt = chassis_info.maxcnt = 0; 701 702 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); 703 if (ret == PDC_OK) { 704 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " 705 "lcd_width=%d, cmd_delay=%u,\n" 706 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", 707 __FILE__, lcd_info.model, 708 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : 709 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", 710 lcd_info.lcd_width, lcd_info.min_cmd_delay, 711 __FILE__, sizeof(lcd_info), 712 chassis_info.actcnt, chassis_info.maxcnt)); 713 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", 714 __FILE__, lcd_info.lcd_cmd_reg_addr, 715 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, 716 lcd_info.reset_cmd2, lcd_info.act_enable )); 717 718 /* check the results. Some machines have a buggy PDC */ 719 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) 720 goto not_found; 721 722 switch (lcd_info.model) { 723 case DISPLAY_MODEL_LCD: /* LCD display */ 724 if (chassis_info.actcnt < 725 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) 726 goto not_found; 727 if (!lcd_info.act_enable) { 728 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); 729 goto not_found; 730 } 731 break; 732 733 case DISPLAY_MODEL_NONE: /* no LED or LCD available */ 734 printk(KERN_INFO "PDC reported no LCD or LED.\n"); 735 goto not_found; 736 737 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ 738 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) 739 goto not_found; 740 break; 741 742 default: 743 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", 744 lcd_info.model); 745 goto not_found; 746 } /* switch() */ 747 748 found: 749 /* register the LCD/LED driver */ 750 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); 751 return 0; 752 753 } else { /* if() */ 754 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); 755 } 756 757 not_found: 758 lcd_info.model = DISPLAY_MODEL_NONE; 759 return 1; 760 } 761 762 static void __exit led_exit(void) 763 { 764 unregister_reboot_notifier(&led_notifier); 765 return; 766 } 767 768 #ifdef CONFIG_PROC_FS 769 module_init(led_create_procfs) 770 #endif 771