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 2001-2002 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
17 */
18
19 #include <linux/config.h>
20 #include <linux/module.h>
21 #include <linux/stddef.h> /* for offsetof() */
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/ioport.h>
25 #include <linux/bitops.h>
26 #include <linux/version.h>
27 #include <linux/delay.h>
28 #include <linux/netdevice.h>
29 #include <linux/interrupt.h>
30 #include <linux/kernel_stat.h>
31 #include <linux/reboot.h>
32 #include <linux/proc_fs.h>
33 #include <linux/ctype.h>
34 #include <asm/io.h>
35 #include <asm/gsc.h>
36 #include <asm/processor.h>
37 #include <asm/hardware.h>
38 #include <asm/param.h> /* HZ */
39 #include <asm/led.h>
40 #include <asm/pdc.h>
41 #include <asm/uaccess.h>
42
43 /* The control of the LEDs and LCDs on PARISC-machines have to be done
44 completely in software. The necessary calculations are done in a tasklet
45 which is scheduled at every timer interrupt and since the calculations
46 may consume relatively much CPU-time some of the calculations can be
47 turned off with the following variables (controlled via procfs) */
48
49 static int led_type = -1;
50 static int led_heartbeat = 1;
51 static int led_diskio = 1;
52 static int led_lanrxtx = 1;
53 static char lcd_text[32];
54
55 #if 0
56 #define DPRINTK(x) printk x
57 #else
58 #define DPRINTK(x)
59 #endif
60
61
62 #define CALC_ADD(val, comp, add) \
63 (val<=(comp/8) ? add/16 : val<=(comp/4) ? add/8 : val<=(comp/2) ? add/4 : add)
64
65
66 struct lcd_block {
67 unsigned char command; /* stores the command byte */
68 unsigned char on; /* value for turning LED on */
69 unsigned char off; /* value for turning LED off */
70 };
71
72 /* Structure returned by PDC_RETURN_CHASSIS_INFO */
73 /* NOTE: we use unsigned long:16 two times, since the following member
74 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
75 struct pdc_chassis_lcd_info_ret_block {
76 unsigned long model:16; /* DISPLAY_MODEL_XXXX */
77 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
78 char *lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */
79 char *lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
80 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */
81 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */
82 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */
83 unsigned char act_enable; /* 0 = no activity (LCD only) */
84 struct lcd_block heartbeat;
85 struct lcd_block disk_io;
86 struct lcd_block lan_rcv;
87 struct lcd_block lan_tx;
88 char _pad;
89 };
90
91
92 /* LCD_CMD and LCD_DATA for KittyHawk machines */
93 #define KITTYHAWK_LCD_CMD (0xfffffffff0190000UL) /* 64bit-ready */
94 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
95
96 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
97 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
98 static struct pdc_chassis_lcd_info_ret_block
99 lcd_info __attribute__((aligned(8))) =
100 {
101 model: DISPLAY_MODEL_LCD,
102 lcd_width: 16,
103 lcd_cmd_reg_addr: (char *) KITTYHAWK_LCD_CMD,
104 lcd_data_reg_addr:(char *) KITTYHAWK_LCD_DATA,
105 min_cmd_delay: 40,
106 reset_cmd1: 0x80,
107 reset_cmd2: 0xc0,
108 };
109
110
111 /* direct access to some of the lcd_info variables */
112 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
113 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr
114 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
115
116
117 /* ptr to LCD/LED-specific function */
118 static void (*led_func_ptr) (unsigned char);
119
120 #define LED_HASLCD 1
121 #define LED_NOLCD 0
122 #ifdef CONFIG_PROC_FS
led_proc_read(char * page,char ** start,off_t off,int count,int * eof,void * data)123 static int led_proc_read(char *page, char **start, off_t off, int count,
124 int *eof, void *data)
125 {
126 char *out = page;
127 int len;
128
129 switch ((long)data)
130 {
131 case LED_NOLCD:
132 out += sprintf(out, "Heartbeat: %d\n", led_heartbeat);
133 out += sprintf(out, "Disk IO: %d\n", led_diskio);
134 out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx);
135 break;
136 case LED_HASLCD:
137 out += sprintf(out, "%s\n", lcd_text);
138 break;
139 default:
140 *eof = 1;
141 return 0;
142 }
143
144 len = out - page - off;
145 if (len < count) {
146 *eof = 1;
147 if (len <= 0) return 0;
148 } else {
149 len = count;
150 }
151 *start = page + off;
152 return len;
153 }
154
led_proc_write(struct file * file,const char * buf,unsigned long count,void * data)155 static int led_proc_write(struct file *file, const char *buf,
156 unsigned long count, void *data)
157 {
158 char *cur, lbuf[count];
159 int d;
160
161 if (!capable(CAP_SYS_ADMIN))
162 return -EACCES;
163
164 memset(lbuf, 0, count);
165
166 copy_from_user(lbuf, buf, count);
167 cur = lbuf;
168
169 /* skip initial spaces */
170 while (*cur && isspace(*cur))
171 {
172 cur++;
173 }
174
175 switch ((long)data)
176 {
177 case LED_NOLCD:
178 d = *cur++ - '0';
179 if (d != 0 && d != 1) goto parse_error;
180 led_heartbeat = d;
181
182 if (*cur++ != ' ') goto parse_error;
183
184 d = *cur++ - '0';
185 if (d != 0 && d != 1) goto parse_error;
186 led_diskio = d;
187
188 if (*cur++ != ' ') goto parse_error;
189
190 d = *cur++ - '0';
191 if (d != 0 && d != 1) goto parse_error;
192 led_lanrxtx = d;
193
194 break;
195 case LED_HASLCD:
196 if (*cur == 0)
197 {
198 /* reset to default */
199 lcd_print("Linux " UTS_RELEASE);
200 }
201 else
202 {
203 /* chop off trailing \n.. if the user gives multiple
204 * \n then it's all their fault.. */
205 if (*cur && cur[strlen(cur)-1] == '\n')
206 cur[strlen(cur)-1] = 0;
207 lcd_print(cur);
208 }
209 break;
210 default:
211 return 0;
212 }
213
214 return count;
215
216 parse_error:
217 if ((long)data == LED_NOLCD)
218 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
219 return -EINVAL;
220 }
221
led_create_procfs(void)222 static int __init led_create_procfs(void)
223 {
224 struct proc_dir_entry *proc_pdc_root = NULL;
225 struct proc_dir_entry *ent;
226
227 if (led_type == -1) return -1;
228
229 proc_pdc_root = proc_mkdir("pdc", 0);
230 if (!proc_pdc_root) return -1;
231 proc_pdc_root->owner = THIS_MODULE;
232 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
233 if (!ent) return -1;
234 ent->nlink = 1;
235 ent->data = (void *)LED_NOLCD; /* LED */
236 ent->read_proc = led_proc_read;
237 ent->write_proc = led_proc_write;
238 ent->owner = THIS_MODULE;
239
240 if (led_type == LED_HASLCD)
241 {
242 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
243 if (!ent) return -1;
244 ent->nlink = 1;
245 ent->data = (void *)LED_HASLCD; /* LCD */
246 ent->read_proc = led_proc_read;
247 ent->write_proc = led_proc_write;
248 ent->owner = THIS_MODULE;
249 }
250
251 return 0;
252 }
253 #endif
254
255 /*
256 **
257 ** led_ASP_driver()
258 **
259 */
260 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */
261 #define LED_STROBE 0x02 /* strobe to clock data */
led_ASP_driver(unsigned char leds)262 static void led_ASP_driver(unsigned char leds)
263 {
264 int i;
265
266 leds = ~leds;
267 for (i = 0; i < 8; i++) {
268 unsigned char value;
269 value = (leds & 0x80) >> 7;
270 gsc_writeb( value, LED_DATA_REG );
271 gsc_writeb( value | LED_STROBE, LED_DATA_REG );
272 leds <<= 1;
273 }
274 }
275
276
277 /*
278 **
279 ** led_LASI_driver()
280 **
281 */
led_LASI_driver(unsigned char leds)282 static void led_LASI_driver(unsigned char leds)
283 {
284 leds = ~leds;
285 gsc_writeb( leds, LED_DATA_REG );
286 }
287
288
289 /*
290 **
291 ** led_LCD_driver()
292 **
293 ** The logic of the LCD driver is, that we write at every scheduled call
294 ** only to one of LCD_CMD_REG _or_ LCD_DATA_REG - registers.
295 ** That way we don't need to let this tasklet busywait for min_cmd_delay
296 ** milliseconds.
297 **
298 ** TODO: check the value of "min_cmd_delay" against the value of HZ.
299 **
300 */
led_LCD_driver(unsigned char leds)301 static void led_LCD_driver(unsigned char leds)
302 {
303 static int last_index; /* 0:heartbeat, 1:disk, 2:lan_in, 3:lan_out */
304 static int last_was_cmd;/* 0: CMD was written last, 1: DATA was last */
305 struct lcd_block *block_ptr;
306 int value;
307
308 switch (last_index) {
309 case 0: block_ptr = &lcd_info.heartbeat;
310 value = leds & LED_HEARTBEAT;
311 break;
312 case 1: block_ptr = &lcd_info.disk_io;
313 value = leds & LED_DISK_IO;
314 break;
315 case 2: block_ptr = &lcd_info.lan_rcv;
316 value = leds & LED_LAN_RCV;
317 break;
318 case 3: block_ptr = &lcd_info.lan_tx;
319 value = leds & LED_LAN_TX;
320 break;
321 default: /* should never happen: */
322 return;
323 }
324
325 if (last_was_cmd) {
326 /* write the value to the LCD data port */
327 gsc_writeb( value ? block_ptr->on : block_ptr->off, LCD_DATA_REG );
328 } else {
329 /* write the command-byte to the LCD command register */
330 gsc_writeb( block_ptr->command, LCD_CMD_REG );
331 }
332
333 /* now update the vars for the next interrupt iteration */
334 if (++last_was_cmd == 2) { /* switch between cmd & data */
335 last_was_cmd = 0;
336 if (++last_index == 4)
337 last_index = 0; /* switch back to heartbeat index */
338 }
339 }
340
341
342 /*
343 **
344 ** led_get_net_stats()
345 **
346 ** calculate the TX- & RX-troughput on the network interfaces in
347 ** the system for usage in the LED code
348 **
349 ** (analog to dev_get_info() from net/core/dev.c)
350 **
351 */
352 static unsigned long led_net_rx_counter, led_net_tx_counter;
353
led_get_net_stats(int addvalue)354 static void led_get_net_stats(int addvalue)
355 {
356 #ifdef CONFIG_NET
357 static unsigned long rx_total_last, tx_total_last;
358 unsigned long rx_total, tx_total;
359 struct net_device *dev;
360 struct net_device_stats *stats;
361
362 rx_total = tx_total = 0;
363
364 /* we are running as a tasklet, so locking dev_base
365 * for reading should be OK */
366 read_lock(&dev_base_lock);
367 for (dev = dev_base; dev != NULL; dev = dev->next) {
368 if (dev->get_stats) {
369 stats = dev->get_stats(dev);
370 rx_total += stats->rx_packets;
371 tx_total += stats->tx_packets;
372 }
373 }
374 read_unlock(&dev_base_lock);
375
376 rx_total -= rx_total_last;
377 tx_total -= tx_total_last;
378
379 if (rx_total)
380 led_net_rx_counter += CALC_ADD(rx_total, tx_total, addvalue);
381
382 if (tx_total)
383 led_net_tx_counter += CALC_ADD(tx_total, rx_total, addvalue);
384
385 rx_total_last += rx_total;
386 tx_total_last += tx_total;
387 #endif
388 }
389
390
391 /*
392 **
393 ** led_get_diskio_stats()
394 **
395 ** calculate the disk-io througput in the system
396 ** (analog to linux/fs/proc/proc_misc.c)
397 **
398 */
399 static unsigned long led_diskio_counter;
400
led_get_diskio_stats(int addvalue)401 static void led_get_diskio_stats(int addvalue)
402 {
403 static unsigned int diskio_total_last, diskio_max;
404 int major, disk, total;
405
406 total = 0;
407 for (major = 0; major < DK_MAX_MAJOR; major++) {
408 for (disk = 0; disk < DK_MAX_DISK; disk++)
409 total += kstat.dk_drive[major][disk];
410 }
411 total -= diskio_total_last;
412
413 if (total) {
414 if (total >= diskio_max) {
415 led_diskio_counter += addvalue;
416 diskio_max = total; /* new maximum value found */
417 } else
418 led_diskio_counter += CALC_ADD(total, diskio_max, addvalue);
419 }
420
421 diskio_total_last += total;
422 }
423
424
425
426 /*
427 ** led_tasklet_func()
428 **
429 ** is scheduled at every timer interrupt from time.c and
430 ** updates the chassis LCD/LED
431
432 TODO:
433 - display load average (older machines like 715/64 have 4 "free" LED's for that)
434 - optimizations
435 */
436
437 static unsigned char currentleds; /* stores current value of the LEDs */
438
439 #define HEARTBEAT_LEN (HZ*6/100)
440 #define HEARTBEAT_2ND_RANGE_START (HZ*22/100)
441 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
442
led_tasklet_func(unsigned long unused)443 static void led_tasklet_func(unsigned long unused)
444 {
445 static unsigned int count, count_HZ;
446 static unsigned char lastleds;
447
448 /* exit if not initialized */
449 if (!led_func_ptr)
450 return;
451
452 /* increment the local counters */
453 ++count;
454 if (++count_HZ == HZ)
455 count_HZ = 0;
456
457 if (led_heartbeat)
458 {
459 /* flash heartbeat-LED like a real heart (2 x short then a long delay) */
460 if (count_HZ<HEARTBEAT_LEN ||
461 (count_HZ>=HEARTBEAT_2ND_RANGE_START && count_HZ<HEARTBEAT_2ND_RANGE_END))
462 currentleds |= LED_HEARTBEAT;
463 else
464 currentleds &= ~LED_HEARTBEAT;
465 }
466
467 /* gather network and diskio statistics and flash LEDs respectively */
468
469 if (led_lanrxtx)
470 {
471 if ((count & 31) == 0)
472 led_get_net_stats(30);
473
474 if (led_net_rx_counter) {
475 led_net_rx_counter--;
476 currentleds |= LED_LAN_RCV;
477 }
478 else
479 currentleds &= ~LED_LAN_RCV;
480
481 if (led_net_tx_counter) {
482 led_net_tx_counter--;
483 currentleds |= LED_LAN_TX;
484 }
485 else
486 currentleds &= ~LED_LAN_TX;
487 }
488
489 if (led_diskio)
490 {
491 /* avoid to calculate diskio-stats at same irq as netio-stats ! */
492 if ((count & 31) == 15)
493 led_get_diskio_stats(30);
494
495 if (led_diskio_counter) {
496 led_diskio_counter--;
497 currentleds |= LED_DISK_IO;
498 }
499 else
500 currentleds &= ~LED_DISK_IO;
501 }
502
503 /* update the LCD/LEDs */
504 if (currentleds != lastleds) {
505 led_func_ptr(currentleds);
506 lastleds = currentleds;
507 }
508 }
509
510 /* main led tasklet struct (scheduled from time.c) */
511 DECLARE_TASKLET_DISABLED(led_tasklet, led_tasklet_func, 0);
512
513
514 /*
515 ** led_halt()
516 **
517 ** called by the reboot notifier chain at shutdown and stops all
518 ** LED/LCD activities.
519 **
520 */
521
522 static int led_halt(struct notifier_block *, unsigned long, void *);
523
524 static struct notifier_block led_notifier = {
525 notifier_call: led_halt,
526 };
527
led_halt(struct notifier_block * nb,unsigned long event,void * buf)528 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
529 {
530 char *txt;
531
532 switch (event) {
533 case SYS_RESTART: txt = "SYSTEM RESTART";
534 break;
535 case SYS_HALT: txt = "SYSTEM HALT";
536 break;
537 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
538 break;
539 default: return NOTIFY_DONE;
540 }
541
542 /* completely stop the LED/LCD tasklet */
543 tasklet_disable(&led_tasklet);
544
545 if (lcd_info.model == DISPLAY_MODEL_LCD)
546 lcd_print(txt);
547 else
548 if (led_func_ptr)
549 led_func_ptr(0xff); /* turn all LEDs ON */
550
551 unregister_reboot_notifier(&led_notifier);
552 return NOTIFY_OK;
553 }
554
555 /*
556 ** register_led_driver()
557 **
558 ** registers an external LED or LCD for usage by this driver.
559 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
560 **
561 */
562
register_led_driver(int model,char * cmd_reg,char * data_reg)563 int __init register_led_driver(int model, char *cmd_reg, char *data_reg)
564 {
565 static int initialized;
566
567 if (initialized || !data_reg)
568 return 1;
569
570 lcd_info.model = model; /* store the values */
571 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? NULL : cmd_reg;
572
573 switch (lcd_info.model) {
574 case DISPLAY_MODEL_LCD:
575 LCD_DATA_REG = data_reg;
576 printk(KERN_INFO "LCD display at %p,%p registered\n",
577 LCD_CMD_REG , LCD_DATA_REG);
578 led_func_ptr = led_LCD_driver;
579 lcd_print( "Linux " UTS_RELEASE );
580 led_type = LED_HASLCD;
581 break;
582
583 case DISPLAY_MODEL_LASI:
584 LED_DATA_REG = data_reg;
585 led_func_ptr = led_LASI_driver;
586 printk(KERN_INFO "LED display at %p registered\n", LED_DATA_REG);
587 led_type = LED_NOLCD;
588 break;
589
590 case DISPLAY_MODEL_OLD_ASP:
591 LED_DATA_REG = data_reg;
592 led_func_ptr = led_ASP_driver;
593 printk(KERN_INFO "LED (ASP-style) display at %p registered\n",
594 LED_DATA_REG);
595 led_type = LED_NOLCD;
596 break;
597
598 default:
599 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
600 __FUNCTION__, lcd_info.model);
601 return 1;
602 }
603
604 /* mark the LCD/LED driver now as initialized and
605 * register to the reboot notifier chain */
606 initialized++;
607 register_reboot_notifier(&led_notifier);
608
609 /* start the led tasklet for the first time */
610 tasklet_enable(&led_tasklet);
611
612 return 0;
613 }
614
615 /*
616 ** register_led_regions()
617 **
618 ** register_led_regions() registers the LCD/LED regions for /procfs.
619 ** At bootup - where the initialisation of the LCD/LED normally happens -
620 ** not all internal structures of request_region() are properly set up,
621 ** so that we delay the led-registration until after busdevices_init()
622 ** has been executed.
623 **
624 */
625
register_led_regions(void)626 void __init register_led_regions(void)
627 {
628 switch (lcd_info.model) {
629 case DISPLAY_MODEL_LCD:
630 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
631 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
632 break;
633 case DISPLAY_MODEL_LASI:
634 case DISPLAY_MODEL_OLD_ASP:
635 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
636 break;
637 }
638 }
639
640
641 /*
642 **
643 ** lcd_print()
644 **
645 ** Displays the given string on the LCD-Display of newer machines.
646 ** lcd_print() disables the timer-based led tasklet during its
647 ** execution and enables it afterwards again.
648 **
649 */
lcd_print(char * str)650 int lcd_print( char *str )
651 {
652 int i;
653
654 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
655 return 0;
656
657 /* temporarily disable the led tasklet */
658 tasklet_disable(&led_tasklet);
659
660 /* copy display string to buffer for procfs */
661 strncpy(lcd_text, str, sizeof(lcd_text)-1);
662
663 /* Set LCD Cursor to 1st character */
664 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
665 udelay(lcd_info.min_cmd_delay);
666
667 /* Print the string */
668 for (i=0; i < lcd_info.lcd_width; i++) {
669 if (str && *str)
670 gsc_writeb(*str++, LCD_DATA_REG);
671 else
672 gsc_writeb(' ', LCD_DATA_REG);
673 udelay(lcd_info.min_cmd_delay);
674 }
675
676 /* re-enable the led tasklet */
677 tasklet_enable(&led_tasklet);
678
679 return lcd_info.lcd_width;
680 }
681
682 /*
683 ** led_init()
684 **
685 ** led_init() is called very early in the bootup-process from setup.c
686 ** and asks the PDC for an usable chassis LCD or LED.
687 ** If the PDC doesn't return any info, then the LED
688 ** is detected by lasi.c or asp.c and registered with the
689 ** above functions lasi_led_init() or asp_led_init().
690 ** KittyHawk machines have often a buggy PDC, so that
691 ** we explicitly check for those machines here.
692 */
693
led_init(void)694 int __init led_init(void)
695 {
696 struct pdc_chassis_info chassis_info;
697 int ret;
698
699 /* Work around the buggy PDC of KittyHawk-machines */
700 switch (CPU_HVERSION) {
701 case 0x580: /* KittyHawk DC2-100 (K100) */
702 case 0x581: /* KittyHawk DC3-120 (K210) */
703 case 0x582: /* KittyHawk DC3 100 (K400) */
704 case 0x583: /* KittyHawk DC3 120 (K410) */
705 case 0x58B: /* KittyHawk DC2 100 (K200) */
706 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
707 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
708 goto found; /* use the preinitialized values of lcd_info */
709 }
710
711 /* initialize the struct, so that we can check for valid return values */
712 lcd_info.model = DISPLAY_MODEL_NONE;
713 chassis_info.actcnt = chassis_info.maxcnt = 0;
714
715 if ((ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info))) == PDC_OK) {
716 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
717 "lcd_width=%d, cmd_delay=%u,\n"
718 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
719 __FILE__, lcd_info.model,
720 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
721 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
722 lcd_info.lcd_width, lcd_info.min_cmd_delay,
723 __FILE__, sizeof(lcd_info),
724 chassis_info.actcnt, chassis_info.maxcnt));
725 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
726 __FILE__, lcd_info.lcd_cmd_reg_addr,
727 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
728 lcd_info.reset_cmd2, lcd_info.act_enable ));
729
730 /* check the results. Some machines have a buggy PDC */
731 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
732 goto not_found;
733
734 switch (lcd_info.model) {
735 case DISPLAY_MODEL_LCD: /* LCD display */
736 if (chassis_info.actcnt <
737 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
738 goto not_found;
739 if (!lcd_info.act_enable) {
740 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
741 goto not_found;
742 }
743 break;
744
745 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
746 printk(KERN_INFO "PDC reported no LCD or LED.\n");
747 goto not_found;
748
749 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
750 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
751 goto not_found;
752 break;
753
754 default:
755 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
756 lcd_info.model);
757 goto not_found;
758 } /* switch() */
759
760 found:
761 /* register the LCD/LED driver */
762 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
763 return 0;
764
765 } else { /* if() */
766 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
767 }
768
769 not_found:
770 lcd_info.model = DISPLAY_MODEL_NONE;
771 return 1;
772 }
773
774 #ifdef CONFIG_PROC_FS
775 module_init(led_create_procfs)
776 #endif
777