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 <linux/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;
64 static unsigned int led_lanrxtx __read_mostly;
65 static char lcd_text[32] __read_mostly;
66 static char lcd_text_default[32] __read_mostly;
67 static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
68
69
70 static struct workqueue_struct *led_wq;
71 static void led_work_func(struct work_struct *);
72 static DECLARE_DELAYED_WORK(led_task, led_work_func);
73
74 #if 0
75 #define DPRINTK(x) printk x
76 #else
77 #define DPRINTK(x)
78 #endif
79
80 struct lcd_block {
81 unsigned char command; /* stores the command byte */
82 unsigned char on; /* value for turning LED on */
83 unsigned char off; /* value for turning LED off */
84 };
85
86 /* Structure returned by PDC_RETURN_CHASSIS_INFO */
87 /* NOTE: we use unsigned long:16 two times, since the following member
88 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
89 struct pdc_chassis_lcd_info_ret_block {
90 unsigned long model:16; /* DISPLAY_MODEL_XXXX */
91 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
92 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */
93 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
94 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */
95 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */
96 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */
97 unsigned char act_enable; /* 0 = no activity (LCD only) */
98 struct lcd_block heartbeat;
99 struct lcd_block disk_io;
100 struct lcd_block lan_rcv;
101 struct lcd_block lan_tx;
102 char _pad;
103 };
104
105
106 /* LCD_CMD and LCD_DATA for KittyHawk machines */
107 #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */
108 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
109
110 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
111 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
112 static struct pdc_chassis_lcd_info_ret_block
113 lcd_info __attribute__((aligned(8))) __read_mostly =
114 {
115 .model = DISPLAY_MODEL_LCD,
116 .lcd_width = 16,
117 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD,
118 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA,
119 .min_cmd_delay = 80,
120 .reset_cmd1 = 0x80,
121 .reset_cmd2 = 0xc0,
122 };
123
124
125 /* direct access to some of the lcd_info variables */
126 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
127 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr
128 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
129
130 #define LED_HASLCD 1
131 #define LED_NOLCD 0
132
133 /* The workqueue must be created at init-time */
start_task(void)134 static int start_task(void)
135 {
136 /* Display the default text now */
137 if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
138
139 /* KittyHawk has no LED support on its LCD */
140 if (lcd_no_led_support) return 0;
141
142 /* Create the work queue and queue the LED task */
143 led_wq = create_singlethread_workqueue("led_wq");
144 if (!led_wq)
145 return -ENOMEM;
146
147 queue_delayed_work(led_wq, &led_task, 0);
148
149 return 0;
150 }
151
152 device_initcall(start_task);
153
154 /* ptr to LCD/LED-specific function */
155 static void (*led_func_ptr) (unsigned char) __read_mostly;
156
157 #ifdef CONFIG_PROC_FS
led_proc_show(struct seq_file * m,void * v)158 static int led_proc_show(struct seq_file *m, void *v)
159 {
160 switch ((long)m->private)
161 {
162 case LED_NOLCD:
163 seq_printf(m, "Heartbeat: %d\n", led_heartbeat);
164 seq_printf(m, "Disk IO: %d\n", led_diskio);
165 seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx);
166 break;
167 case LED_HASLCD:
168 seq_printf(m, "%s\n", lcd_text);
169 break;
170 default:
171 return 0;
172 }
173 return 0;
174 }
175
led_proc_open(struct inode * inode,struct file * file)176 static int led_proc_open(struct inode *inode, struct file *file)
177 {
178 return single_open(file, led_proc_show, PDE_DATA(inode));
179 }
180
181
led_proc_write(struct file * file,const char __user * buf,size_t count,loff_t * pos)182 static ssize_t led_proc_write(struct file *file, const char __user *buf,
183 size_t count, loff_t *pos)
184 {
185 void *data = PDE_DATA(file_inode(file));
186 char *cur, lbuf[32];
187 int d;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EACCES;
191
192 if (count >= sizeof(lbuf))
193 count = sizeof(lbuf)-1;
194
195 if (copy_from_user(lbuf, buf, count))
196 return -EFAULT;
197 lbuf[count] = 0;
198
199 cur = lbuf;
200
201 switch ((long)data)
202 {
203 case LED_NOLCD:
204 d = *cur++ - '0';
205 if (d != 0 && d != 1) goto parse_error;
206 led_heartbeat = d;
207
208 if (*cur++ != ' ') goto parse_error;
209
210 d = *cur++ - '0';
211 if (d != 0 && d != 1) goto parse_error;
212 led_diskio = d;
213
214 if (*cur++ != ' ') goto parse_error;
215
216 d = *cur++ - '0';
217 if (d != 0 && d != 1) goto parse_error;
218 led_lanrxtx = d;
219
220 break;
221 case LED_HASLCD:
222 if (*cur && cur[strlen(cur)-1] == '\n')
223 cur[strlen(cur)-1] = 0;
224 if (*cur == 0)
225 cur = lcd_text_default;
226 lcd_print(cur);
227 break;
228 default:
229 return 0;
230 }
231
232 return count;
233
234 parse_error:
235 if ((long)data == LED_NOLCD)
236 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
237 return -EINVAL;
238 }
239
240 static const struct file_operations led_proc_fops = {
241 .owner = THIS_MODULE,
242 .open = led_proc_open,
243 .read = seq_read,
244 .llseek = seq_lseek,
245 .release = single_release,
246 .write = led_proc_write,
247 };
248
led_create_procfs(void)249 static int __init led_create_procfs(void)
250 {
251 struct proc_dir_entry *proc_pdc_root = NULL;
252 struct proc_dir_entry *ent;
253
254 if (led_type == -1) return -1;
255
256 proc_pdc_root = proc_mkdir("pdc", NULL);
257 if (!proc_pdc_root) return -1;
258
259 if (!lcd_no_led_support)
260 {
261 ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root,
262 &led_proc_fops, (void *)LED_NOLCD); /* LED */
263 if (!ent) return -1;
264 }
265
266 if (led_type == LED_HASLCD)
267 {
268 ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root,
269 &led_proc_fops, (void *)LED_HASLCD); /* LCD */
270 if (!ent) return -1;
271 }
272
273 return 0;
274 }
275 #endif
276
277 /*
278 **
279 ** led_ASP_driver()
280 **
281 */
282 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */
283 #define LED_STROBE 0x02 /* strobe to clock data */
led_ASP_driver(unsigned char leds)284 static void led_ASP_driver(unsigned char leds)
285 {
286 int i;
287
288 leds = ~leds;
289 for (i = 0; i < 8; i++) {
290 unsigned char value;
291 value = (leds & 0x80) >> 7;
292 gsc_writeb( value, LED_DATA_REG );
293 gsc_writeb( value | LED_STROBE, LED_DATA_REG );
294 leds <<= 1;
295 }
296 }
297
298
299 /*
300 **
301 ** led_LASI_driver()
302 **
303 */
led_LASI_driver(unsigned char leds)304 static void led_LASI_driver(unsigned char leds)
305 {
306 leds = ~leds;
307 gsc_writeb( leds, LED_DATA_REG );
308 }
309
310
311 /*
312 **
313 ** led_LCD_driver()
314 **
315 */
led_LCD_driver(unsigned char leds)316 static void led_LCD_driver(unsigned char leds)
317 {
318 static int i;
319 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
320 LED_LAN_RCV, LED_LAN_TX };
321
322 static struct lcd_block * blockp[4] = {
323 &lcd_info.heartbeat,
324 &lcd_info.disk_io,
325 &lcd_info.lan_rcv,
326 &lcd_info.lan_tx
327 };
328
329 /* Convert min_cmd_delay to milliseconds */
330 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
331
332 for (i=0; i<4; ++i)
333 {
334 if ((leds & mask[i]) != (lastleds & mask[i]))
335 {
336 gsc_writeb( blockp[i]->command, LCD_CMD_REG );
337 msleep(msec_cmd_delay);
338
339 gsc_writeb( leds & mask[i] ? blockp[i]->on :
340 blockp[i]->off, LCD_DATA_REG );
341 msleep(msec_cmd_delay);
342 }
343 }
344 }
345
346
347 /*
348 **
349 ** led_get_net_activity()
350 **
351 ** calculate if there was TX- or RX-throughput on the network interfaces
352 ** (analog to dev_get_info() from net/core/dev.c)
353 **
354 */
led_get_net_activity(void)355 static __inline__ int led_get_net_activity(void)
356 {
357 #ifndef CONFIG_NET
358 return 0;
359 #else
360 static u64 rx_total_last, tx_total_last;
361 u64 rx_total, tx_total;
362 struct net_device *dev;
363 int retval;
364
365 rx_total = tx_total = 0;
366
367 /* we are running as a workqueue task, so we can use an RCU lookup */
368 rcu_read_lock();
369 for_each_netdev_rcu(&init_net, dev) {
370 const struct rtnl_link_stats64 *stats;
371 struct rtnl_link_stats64 temp;
372 struct in_device *in_dev = __in_dev_get_rcu(dev);
373 if (!in_dev || !in_dev->ifa_list)
374 continue;
375 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
376 continue;
377 stats = dev_get_stats(dev, &temp);
378 rx_total += stats->rx_packets;
379 tx_total += stats->tx_packets;
380 }
381 rcu_read_unlock();
382
383 retval = 0;
384
385 if (rx_total != rx_total_last) {
386 rx_total_last = rx_total;
387 retval |= LED_LAN_RCV;
388 }
389
390 if (tx_total != tx_total_last) {
391 tx_total_last = tx_total;
392 retval |= LED_LAN_TX;
393 }
394
395 return retval;
396 #endif
397 }
398
399
400 /*
401 **
402 ** led_get_diskio_activity()
403 **
404 ** calculate if there was disk-io in the system
405 **
406 */
led_get_diskio_activity(void)407 static __inline__ int led_get_diskio_activity(void)
408 {
409 static unsigned long last_pgpgin, last_pgpgout;
410 unsigned long events[NR_VM_EVENT_ITEMS];
411 int changed;
412
413 all_vm_events(events);
414
415 /* Just use a very simple calculation here. Do not care about overflow,
416 since we only want to know if there was activity or not. */
417 changed = (events[PGPGIN] != last_pgpgin) ||
418 (events[PGPGOUT] != last_pgpgout);
419 last_pgpgin = events[PGPGIN];
420 last_pgpgout = events[PGPGOUT];
421
422 return (changed ? LED_DISK_IO : 0);
423 }
424
425
426
427 /*
428 ** led_work_func()
429 **
430 ** manages when and which chassis LCD/LED gets updated
431
432 TODO:
433 - display load average (older machines like 715/64 have 4 "free" LED's for that)
434 - optimizations
435 */
436
437 #define HEARTBEAT_LEN (HZ*10/100)
438 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
439 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
440
441 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
442
led_work_func(struct work_struct * unused)443 static void led_work_func (struct work_struct *unused)
444 {
445 static unsigned long last_jiffies;
446 static unsigned long count_HZ; /* counter in range 0..HZ */
447 unsigned char currentleds = 0; /* stores current value of the LEDs */
448
449 /* exit if not initialized */
450 if (!led_func_ptr)
451 return;
452
453 /* increment the heartbeat timekeeper */
454 count_HZ += jiffies - last_jiffies;
455 last_jiffies = jiffies;
456 if (count_HZ >= HZ)
457 count_HZ = 0;
458
459 if (likely(led_heartbeat))
460 {
461 /* flash heartbeat-LED like a real heart
462 * (2 x short then a long delay)
463 */
464 if (count_HZ < HEARTBEAT_LEN ||
465 (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
466 count_HZ < HEARTBEAT_2ND_RANGE_END))
467 currentleds |= LED_HEARTBEAT;
468 }
469
470 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
471 if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
472
473 /* blink LEDs if we got an Oops (HPMC) */
474 if (unlikely(oops_in_progress)) {
475 if (boot_cpu_data.cpu_type >= pcxl2) {
476 /* newer machines don't have loadavg. LEDs, so we
477 * let all LEDs blink twice per second instead */
478 currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff;
479 } else {
480 /* old machines: blink loadavg. LEDs twice per second */
481 if (count_HZ <= (HZ/2))
482 currentleds &= ~(LED4|LED5|LED6|LED7);
483 else
484 currentleds |= (LED4|LED5|LED6|LED7);
485 }
486 }
487
488 if (currentleds != lastleds)
489 {
490 led_func_ptr(currentleds); /* Update the LCD/LEDs */
491 lastleds = currentleds;
492 }
493
494 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
495 }
496
497 /*
498 ** led_halt()
499 **
500 ** called by the reboot notifier chain at shutdown and stops all
501 ** LED/LCD activities.
502 **
503 */
504
505 static int led_halt(struct notifier_block *, unsigned long, void *);
506
507 static struct notifier_block led_notifier = {
508 .notifier_call = led_halt,
509 };
510 static int notifier_disabled = 0;
511
led_halt(struct notifier_block * nb,unsigned long event,void * buf)512 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
513 {
514 char *txt;
515
516 if (notifier_disabled)
517 return NOTIFY_OK;
518
519 notifier_disabled = 1;
520 switch (event) {
521 case SYS_RESTART: txt = "SYSTEM RESTART";
522 break;
523 case SYS_HALT: txt = "SYSTEM HALT";
524 break;
525 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
526 break;
527 default: return NOTIFY_DONE;
528 }
529
530 /* Cancel the work item and delete the queue */
531 if (led_wq) {
532 cancel_delayed_work_sync(&led_task);
533 destroy_workqueue(led_wq);
534 led_wq = NULL;
535 }
536
537 if (lcd_info.model == DISPLAY_MODEL_LCD)
538 lcd_print(txt);
539 else
540 if (led_func_ptr)
541 led_func_ptr(0xff); /* turn all LEDs ON */
542
543 return NOTIFY_OK;
544 }
545
546 /*
547 ** register_led_driver()
548 **
549 ** registers an external LED or LCD for usage by this driver.
550 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
551 **
552 */
553
register_led_driver(int model,unsigned long cmd_reg,unsigned long data_reg)554 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
555 {
556 static int initialized;
557
558 if (initialized || !data_reg)
559 return 1;
560
561 lcd_info.model = model; /* store the values */
562 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
563
564 switch (lcd_info.model) {
565 case DISPLAY_MODEL_LCD:
566 LCD_DATA_REG = data_reg;
567 printk(KERN_INFO "LCD display at %lx,%lx registered\n",
568 LCD_CMD_REG , LCD_DATA_REG);
569 led_func_ptr = led_LCD_driver;
570 led_type = LED_HASLCD;
571 break;
572
573 case DISPLAY_MODEL_LASI:
574 /* Skip to register LED in QEMU */
575 if (running_on_qemu)
576 return 1;
577 LED_DATA_REG = data_reg;
578 led_func_ptr = led_LASI_driver;
579 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);
580 led_type = LED_NOLCD;
581 break;
582
583 case DISPLAY_MODEL_OLD_ASP:
584 LED_DATA_REG = data_reg;
585 led_func_ptr = led_ASP_driver;
586 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",
587 LED_DATA_REG);
588 led_type = LED_NOLCD;
589 break;
590
591 default:
592 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
593 __func__, lcd_info.model);
594 return 1;
595 }
596
597 /* mark the LCD/LED driver now as initialized and
598 * register to the reboot notifier chain */
599 initialized++;
600 register_reboot_notifier(&led_notifier);
601
602 /* Ensure the work is queued */
603 if (led_wq) {
604 queue_delayed_work(led_wq, &led_task, 0);
605 }
606
607 return 0;
608 }
609
610 /*
611 ** register_led_regions()
612 **
613 ** register_led_regions() registers the LCD/LED regions for /procfs.
614 ** At bootup - where the initialisation of the LCD/LED normally happens -
615 ** not all internal structures of request_region() are properly set up,
616 ** so that we delay the led-registration until after busdevices_init()
617 ** has been executed.
618 **
619 */
620
register_led_regions(void)621 void __init register_led_regions(void)
622 {
623 switch (lcd_info.model) {
624 case DISPLAY_MODEL_LCD:
625 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
626 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
627 break;
628 case DISPLAY_MODEL_LASI:
629 case DISPLAY_MODEL_OLD_ASP:
630 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
631 break;
632 }
633 }
634
635
636 /*
637 **
638 ** lcd_print()
639 **
640 ** Displays the given string on the LCD-Display of newer machines.
641 ** lcd_print() disables/enables the timer-based led work queue to
642 ** avoid a race condition while writing the CMD/DATA register pair.
643 **
644 */
lcd_print(const char * str)645 int lcd_print( const char *str )
646 {
647 int i;
648
649 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
650 return 0;
651
652 /* temporarily disable the led work task */
653 if (led_wq)
654 cancel_delayed_work_sync(&led_task);
655
656 /* copy display string to buffer for procfs */
657 strlcpy(lcd_text, str, sizeof(lcd_text));
658
659 /* Set LCD Cursor to 1st character */
660 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
661 udelay(lcd_info.min_cmd_delay);
662
663 /* Print the string */
664 for (i=0; i < lcd_info.lcd_width; i++) {
665 if (str && *str)
666 gsc_writeb(*str++, LCD_DATA_REG);
667 else
668 gsc_writeb(' ', LCD_DATA_REG);
669 udelay(lcd_info.min_cmd_delay);
670 }
671
672 /* re-queue the work */
673 if (led_wq) {
674 queue_delayed_work(led_wq, &led_task, 0);
675 }
676
677 return lcd_info.lcd_width;
678 }
679
680 /*
681 ** led_init()
682 **
683 ** led_init() is called very early in the bootup-process from setup.c
684 ** and asks the PDC for an usable chassis LCD or LED.
685 ** If the PDC doesn't return any info, then the LED
686 ** is detected by lasi.c or asp.c and registered with the
687 ** above functions lasi_led_init() or asp_led_init().
688 ** KittyHawk machines have often a buggy PDC, so that
689 ** we explicitly check for those machines here.
690 */
691
led_init(void)692 int __init led_init(void)
693 {
694 struct pdc_chassis_info chassis_info;
695 int ret;
696
697 snprintf(lcd_text_default, sizeof(lcd_text_default),
698 "Linux %s", init_utsname()->release);
699
700 /* Work around the buggy PDC of KittyHawk-machines */
701 switch (CPU_HVERSION) {
702 case 0x580: /* KittyHawk DC2-100 (K100) */
703 case 0x581: /* KittyHawk DC3-120 (K210) */
704 case 0x582: /* KittyHawk DC3 100 (K400) */
705 case 0x583: /* KittyHawk DC3 120 (K410) */
706 case 0x58B: /* KittyHawk DC2 100 (K200) */
707 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
708 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
709 lcd_no_led_support = 1;
710 goto found; /* use the preinitialized values of lcd_info */
711 }
712
713 /* initialize the struct, so that we can check for valid return values */
714 lcd_info.model = DISPLAY_MODEL_NONE;
715 chassis_info.actcnt = chassis_info.maxcnt = 0;
716
717 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
718 if (ret == PDC_OK) {
719 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
720 "lcd_width=%d, cmd_delay=%u,\n"
721 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
722 __FILE__, lcd_info.model,
723 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
724 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
725 lcd_info.lcd_width, lcd_info.min_cmd_delay,
726 __FILE__, sizeof(lcd_info),
727 chassis_info.actcnt, chassis_info.maxcnt));
728 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
729 __FILE__, lcd_info.lcd_cmd_reg_addr,
730 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
731 lcd_info.reset_cmd2, lcd_info.act_enable ));
732
733 /* check the results. Some machines have a buggy PDC */
734 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
735 goto not_found;
736
737 switch (lcd_info.model) {
738 case DISPLAY_MODEL_LCD: /* LCD display */
739 if (chassis_info.actcnt <
740 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
741 goto not_found;
742 if (!lcd_info.act_enable) {
743 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
744 goto not_found;
745 }
746 break;
747
748 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
749 printk(KERN_INFO "PDC reported no LCD or LED.\n");
750 goto not_found;
751
752 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
753 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
754 goto not_found;
755 break;
756
757 default:
758 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
759 lcd_info.model);
760 goto not_found;
761 } /* switch() */
762
763 found:
764 /* register the LCD/LED driver */
765 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
766 return 0;
767
768 } else { /* if() */
769 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
770 }
771
772 not_found:
773 lcd_info.model = DISPLAY_MODEL_NONE;
774 return 1;
775 }
776
led_exit(void)777 static void __exit led_exit(void)
778 {
779 unregister_reboot_notifier(&led_notifier);
780 return;
781 }
782
783 #ifdef CONFIG_PROC_FS
784 module_init(led_create_procfs)
785 #endif
786