1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Chassis LCD/LED driver for HP-PARISC workstations
4 *
5 * (c) Copyright 2000 Red Hat Software
6 * (c) Copyright 2000 Helge Deller <hdeller@redhat.com>
7 * (c) Copyright 2001-2009 Helge Deller <deller@gmx.de>
8 * (c) Copyright 2001 Randolph Chung <tausq@debian.org>
9 *
10 * TODO:
11 * - speed-up calculations with inlined assembler
12 * - interface to write to second row of LCD from /proc (if technically possible)
13 *
14 * Changes:
15 * - Audit copy_from_user in led_proc_write.
16 * Daniele Bellucci <bellucda@tiscali.it>
17 * - Switch from using a tasklet to a work queue, so the led_LCD_driver
18 * can sleep.
19 * David Pye <dmp@davidmpye.dyndns.org>
20 */
21
22 #include <linux/module.h>
23 #include <linux/stddef.h> /* for offsetof() */
24 #include <linux/init.h>
25 #include <linux/types.h>
26 #include <linux/ioport.h>
27 #include <linux/utsname.h>
28 #include <linux/capability.h>
29 #include <linux/delay.h>
30 #include <linux/netdevice.h>
31 #include <linux/inetdevice.h>
32 #include <linux/in.h>
33 #include <linux/interrupt.h>
34 #include <linux/kernel_stat.h>
35 #include <linux/reboot.h>
36 #include <linux/proc_fs.h>
37 #include <linux/seq_file.h>
38 #include <linux/ctype.h>
39 #include <linux/blkdev.h>
40 #include <linux/workqueue.h>
41 #include <linux/rcupdate.h>
42 #include <asm/io.h>
43 #include <asm/processor.h>
44 #include <asm/hardware.h>
45 #include <asm/param.h> /* HZ */
46 #include <asm/led.h>
47 #include <asm/pdc.h>
48 #include <linux/uaccess.h>
49
50 /* The control of the LEDs and LCDs on PARISC-machines have to be done
51 completely in software. The necessary calculations are done in a work queue
52 task which is scheduled regularly, and since the calculations may consume a
53 relatively large amount of CPU time, some of the calculations can be
54 turned off with the following variables (controlled via procfs) */
55
56 static int led_type __read_mostly = -1;
57 static unsigned char lastleds; /* LED state from most recent update */
58 static unsigned int led_heartbeat __read_mostly = 1;
59 static unsigned int led_diskio __read_mostly = 1;
60 static unsigned int led_lanrxtx __read_mostly = 1;
61 static char lcd_text[32] __read_mostly;
62 static char lcd_text_default[32] __read_mostly;
63 static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
64
65
66 static struct workqueue_struct *led_wq;
67 static void led_work_func(struct work_struct *);
68 static DECLARE_DELAYED_WORK(led_task, led_work_func);
69
70 #if 0
71 #define DPRINTK(x) printk x
72 #else
73 #define DPRINTK(x)
74 #endif
75
76 struct lcd_block {
77 unsigned char command; /* stores the command byte */
78 unsigned char on; /* value for turning LED on */
79 unsigned char off; /* value for turning LED off */
80 };
81
82 /* Structure returned by PDC_RETURN_CHASSIS_INFO */
83 /* NOTE: we use unsigned long:16 two times, since the following member
84 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
85 struct pdc_chassis_lcd_info_ret_block {
86 unsigned long model:16; /* DISPLAY_MODEL_XXXX */
87 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
88 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */
89 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
90 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */
91 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */
92 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */
93 unsigned char act_enable; /* 0 = no activity (LCD only) */
94 struct lcd_block heartbeat;
95 struct lcd_block disk_io;
96 struct lcd_block lan_rcv;
97 struct lcd_block lan_tx;
98 char _pad;
99 };
100
101
102 /* LCD_CMD and LCD_DATA for KittyHawk machines */
103 #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */
104 #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
105
106 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
107 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
108 static struct pdc_chassis_lcd_info_ret_block
109 lcd_info __attribute__((aligned(8))) __read_mostly =
110 {
111 .model = DISPLAY_MODEL_LCD,
112 .lcd_width = 16,
113 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD,
114 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA,
115 .min_cmd_delay = 80,
116 .reset_cmd1 = 0x80,
117 .reset_cmd2 = 0xc0,
118 };
119
120
121 /* direct access to some of the lcd_info variables */
122 #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
123 #define LCD_DATA_REG lcd_info.lcd_data_reg_addr
124 #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
125
126 #define LED_HASLCD 1
127 #define LED_NOLCD 0
128
129 /* The workqueue must be created at init-time */
start_task(void)130 static int start_task(void)
131 {
132 /* Display the default text now */
133 if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
134
135 /* KittyHawk has no LED support on its LCD */
136 if (lcd_no_led_support) return 0;
137
138 /* Create the work queue and queue the LED task */
139 led_wq = create_singlethread_workqueue("led_wq");
140 if (!led_wq)
141 return -ENOMEM;
142
143 queue_delayed_work(led_wq, &led_task, 0);
144
145 return 0;
146 }
147
148 device_initcall(start_task);
149
150 /* ptr to LCD/LED-specific function */
151 static void (*led_func_ptr) (unsigned char) __read_mostly;
152
153 #ifdef CONFIG_PROC_FS
led_proc_show(struct seq_file * m,void * v)154 static int led_proc_show(struct seq_file *m, void *v)
155 {
156 switch ((long)m->private)
157 {
158 case LED_NOLCD:
159 seq_printf(m, "Heartbeat: %d\n", led_heartbeat);
160 seq_printf(m, "Disk IO: %d\n", led_diskio);
161 seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx);
162 break;
163 case LED_HASLCD:
164 seq_printf(m, "%s\n", lcd_text);
165 break;
166 default:
167 return 0;
168 }
169 return 0;
170 }
171
led_proc_open(struct inode * inode,struct file * file)172 static int led_proc_open(struct inode *inode, struct file *file)
173 {
174 return single_open(file, led_proc_show, pde_data(inode));
175 }
176
177
led_proc_write(struct file * file,const char __user * buf,size_t count,loff_t * pos)178 static ssize_t led_proc_write(struct file *file, const char __user *buf,
179 size_t count, loff_t *pos)
180 {
181 void *data = pde_data(file_inode(file));
182 char *cur, lbuf[32];
183 int d;
184
185 if (!capable(CAP_SYS_ADMIN))
186 return -EACCES;
187
188 if (count >= sizeof(lbuf))
189 count = sizeof(lbuf)-1;
190
191 if (copy_from_user(lbuf, buf, count))
192 return -EFAULT;
193 lbuf[count] = 0;
194
195 cur = lbuf;
196
197 switch ((long)data)
198 {
199 case LED_NOLCD:
200 d = *cur++ - '0';
201 if (d != 0 && d != 1) goto parse_error;
202 led_heartbeat = d;
203
204 if (*cur++ != ' ') goto parse_error;
205
206 d = *cur++ - '0';
207 if (d != 0 && d != 1) goto parse_error;
208 led_diskio = d;
209
210 if (*cur++ != ' ') goto parse_error;
211
212 d = *cur++ - '0';
213 if (d != 0 && d != 1) goto parse_error;
214 led_lanrxtx = d;
215
216 break;
217 case LED_HASLCD:
218 if (*cur && cur[strlen(cur)-1] == '\n')
219 cur[strlen(cur)-1] = 0;
220 if (*cur == 0)
221 cur = lcd_text_default;
222 lcd_print(cur);
223 break;
224 default:
225 return 0;
226 }
227
228 return count;
229
230 parse_error:
231 if ((long)data == LED_NOLCD)
232 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
233 return -EINVAL;
234 }
235
236 static const struct proc_ops led_proc_ops = {
237 .proc_open = led_proc_open,
238 .proc_read = seq_read,
239 .proc_lseek = seq_lseek,
240 .proc_release = single_release,
241 .proc_write = led_proc_write,
242 };
243
led_create_procfs(void)244 static int __init led_create_procfs(void)
245 {
246 struct proc_dir_entry *proc_pdc_root = NULL;
247 struct proc_dir_entry *ent;
248
249 if (led_type == -1) return -1;
250
251 proc_pdc_root = proc_mkdir("pdc", NULL);
252 if (!proc_pdc_root) return -1;
253
254 if (!lcd_no_led_support)
255 {
256 ent = proc_create_data("led", 0644, proc_pdc_root,
257 &led_proc_ops, (void *)LED_NOLCD); /* LED */
258 if (!ent) return -1;
259 }
260
261 if (led_type == LED_HASLCD)
262 {
263 ent = proc_create_data("lcd", 0644, proc_pdc_root,
264 &led_proc_ops, (void *)LED_HASLCD); /* LCD */
265 if (!ent) return -1;
266 }
267
268 return 0;
269 }
270 #endif
271
272 /*
273 **
274 ** led_ASP_driver()
275 **
276 */
277 #define LED_DATA 0x01 /* data to shift (0:on 1:off) */
278 #define LED_STROBE 0x02 /* strobe to clock data */
led_ASP_driver(unsigned char leds)279 static void led_ASP_driver(unsigned char leds)
280 {
281 int i;
282
283 leds = ~leds;
284 for (i = 0; i < 8; i++) {
285 unsigned char value;
286 value = (leds & 0x80) >> 7;
287 gsc_writeb( value, LED_DATA_REG );
288 gsc_writeb( value | LED_STROBE, LED_DATA_REG );
289 leds <<= 1;
290 }
291 }
292
293
294 /*
295 **
296 ** led_LASI_driver()
297 **
298 */
led_LASI_driver(unsigned char leds)299 static void led_LASI_driver(unsigned char leds)
300 {
301 leds = ~leds;
302 gsc_writeb( leds, LED_DATA_REG );
303 }
304
305
306 /*
307 **
308 ** led_LCD_driver()
309 **
310 */
led_LCD_driver(unsigned char leds)311 static void led_LCD_driver(unsigned char leds)
312 {
313 static int i;
314 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
315 LED_LAN_RCV, LED_LAN_TX };
316
317 static struct lcd_block * blockp[4] = {
318 &lcd_info.heartbeat,
319 &lcd_info.disk_io,
320 &lcd_info.lan_rcv,
321 &lcd_info.lan_tx
322 };
323
324 /* Convert min_cmd_delay to milliseconds */
325 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
326
327 for (i=0; i<4; ++i)
328 {
329 if ((leds & mask[i]) != (lastleds & mask[i]))
330 {
331 gsc_writeb( blockp[i]->command, LCD_CMD_REG );
332 msleep(msec_cmd_delay);
333
334 gsc_writeb( leds & mask[i] ? blockp[i]->on :
335 blockp[i]->off, LCD_DATA_REG );
336 msleep(msec_cmd_delay);
337 }
338 }
339 }
340
341
342 /*
343 **
344 ** led_get_net_activity()
345 **
346 ** calculate if there was TX- or RX-throughput on the network interfaces
347 ** (analog to dev_get_info() from net/core/dev.c)
348 **
349 */
led_get_net_activity(void)350 static __inline__ int led_get_net_activity(void)
351 {
352 #ifndef CONFIG_NET
353 return 0;
354 #else
355 static u64 rx_total_last, tx_total_last;
356 u64 rx_total, tx_total;
357 struct net_device *dev;
358 int retval;
359
360 rx_total = tx_total = 0;
361
362 /* we are running as a workqueue task, so we can use an RCU lookup */
363 rcu_read_lock();
364 for_each_netdev_rcu(&init_net, dev) {
365 const struct rtnl_link_stats64 *stats;
366 struct rtnl_link_stats64 temp;
367 struct in_device *in_dev = __in_dev_get_rcu(dev);
368 if (!in_dev || !in_dev->ifa_list)
369 continue;
370 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
371 continue;
372 stats = dev_get_stats(dev, &temp);
373 rx_total += stats->rx_packets;
374 tx_total += stats->tx_packets;
375 }
376 rcu_read_unlock();
377
378 retval = 0;
379
380 if (rx_total != rx_total_last) {
381 rx_total_last = rx_total;
382 retval |= LED_LAN_RCV;
383 }
384
385 if (tx_total != tx_total_last) {
386 tx_total_last = tx_total;
387 retval |= LED_LAN_TX;
388 }
389
390 return retval;
391 #endif
392 }
393
394
395 /*
396 **
397 ** led_get_diskio_activity()
398 **
399 ** calculate if there was disk-io in the system
400 **
401 */
led_get_diskio_activity(void)402 static __inline__ int led_get_diskio_activity(void)
403 {
404 static unsigned long last_pgpgin, last_pgpgout;
405 unsigned long events[NR_VM_EVENT_ITEMS];
406 int changed;
407
408 all_vm_events(events);
409
410 /* Just use a very simple calculation here. Do not care about overflow,
411 since we only want to know if there was activity or not. */
412 changed = (events[PGPGIN] != last_pgpgin) ||
413 (events[PGPGOUT] != last_pgpgout);
414 last_pgpgin = events[PGPGIN];
415 last_pgpgout = events[PGPGOUT];
416
417 return (changed ? LED_DISK_IO : 0);
418 }
419
420
421
422 /*
423 ** led_work_func()
424 **
425 ** manages when and which chassis LCD/LED gets updated
426
427 TODO:
428 - display load average (older machines like 715/64 have 4 "free" LED's for that)
429 - optimizations
430 */
431
432 #define HEARTBEAT_LEN (HZ*10/100)
433 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
434 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
435
436 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
437
led_work_func(struct work_struct * unused)438 static void led_work_func (struct work_struct *unused)
439 {
440 static unsigned long last_jiffies;
441 static unsigned long count_HZ; /* counter in range 0..HZ */
442 unsigned char currentleds = 0; /* stores current value of the LEDs */
443
444 /* exit if not initialized */
445 if (!led_func_ptr)
446 return;
447
448 /* increment the heartbeat timekeeper */
449 count_HZ += jiffies - last_jiffies;
450 last_jiffies = jiffies;
451 if (count_HZ >= HZ)
452 count_HZ = 0;
453
454 if (likely(led_heartbeat))
455 {
456 /* flash heartbeat-LED like a real heart
457 * (2 x short then a long delay)
458 */
459 if (count_HZ < HEARTBEAT_LEN ||
460 (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
461 count_HZ < HEARTBEAT_2ND_RANGE_END))
462 currentleds |= LED_HEARTBEAT;
463 }
464
465 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
466 if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
467
468 /* blink LEDs if we got an Oops (HPMC) */
469 if (unlikely(oops_in_progress)) {
470 if (boot_cpu_data.cpu_type >= pcxl2) {
471 /* newer machines don't have loadavg. LEDs, so we
472 * let all LEDs blink twice per second instead */
473 currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff;
474 } else {
475 /* old machines: blink loadavg. LEDs twice per second */
476 if (count_HZ <= (HZ/2))
477 currentleds &= ~(LED4|LED5|LED6|LED7);
478 else
479 currentleds |= (LED4|LED5|LED6|LED7);
480 }
481 }
482
483 if (currentleds != lastleds)
484 {
485 led_func_ptr(currentleds); /* Update the LCD/LEDs */
486 lastleds = currentleds;
487 }
488
489 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
490 }
491
492 /*
493 ** led_halt()
494 **
495 ** called by the reboot notifier chain at shutdown and stops all
496 ** LED/LCD activities.
497 **
498 */
499
500 static int led_halt(struct notifier_block *, unsigned long, void *);
501
502 static struct notifier_block led_notifier = {
503 .notifier_call = led_halt,
504 };
505 static int notifier_disabled = 0;
506
led_halt(struct notifier_block * nb,unsigned long event,void * buf)507 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
508 {
509 char *txt;
510
511 if (notifier_disabled)
512 return NOTIFY_OK;
513
514 notifier_disabled = 1;
515 switch (event) {
516 case SYS_RESTART: txt = "SYSTEM RESTART";
517 break;
518 case SYS_HALT: txt = "SYSTEM HALT";
519 break;
520 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
521 break;
522 default: return NOTIFY_DONE;
523 }
524
525 /* Cancel the work item and delete the queue */
526 if (led_wq) {
527 cancel_delayed_work_sync(&led_task);
528 destroy_workqueue(led_wq);
529 led_wq = NULL;
530 }
531
532 if (lcd_info.model == DISPLAY_MODEL_LCD)
533 lcd_print(txt);
534 else
535 if (led_func_ptr)
536 led_func_ptr(0xff); /* turn all LEDs ON */
537
538 return NOTIFY_OK;
539 }
540
541 /*
542 ** register_led_driver()
543 **
544 ** registers an external LED or LCD for usage by this driver.
545 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
546 **
547 */
548
register_led_driver(int model,unsigned long cmd_reg,unsigned long data_reg)549 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
550 {
551 static int initialized;
552
553 if (initialized || !data_reg)
554 return 1;
555
556 lcd_info.model = model; /* store the values */
557 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
558
559 switch (lcd_info.model) {
560 case DISPLAY_MODEL_LCD:
561 LCD_DATA_REG = data_reg;
562 printk(KERN_INFO "LCD display at %lx,%lx registered\n",
563 LCD_CMD_REG , LCD_DATA_REG);
564 led_func_ptr = led_LCD_driver;
565 led_type = LED_HASLCD;
566 break;
567
568 case DISPLAY_MODEL_LASI:
569 /* Skip to register LED in QEMU */
570 if (running_on_qemu)
571 return 1;
572 LED_DATA_REG = data_reg;
573 led_func_ptr = led_LASI_driver;
574 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);
575 led_type = LED_NOLCD;
576 break;
577
578 case DISPLAY_MODEL_OLD_ASP:
579 LED_DATA_REG = data_reg;
580 led_func_ptr = led_ASP_driver;
581 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",
582 LED_DATA_REG);
583 led_type = LED_NOLCD;
584 break;
585
586 default:
587 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
588 __func__, lcd_info.model);
589 return 1;
590 }
591
592 /* mark the LCD/LED driver now as initialized and
593 * register to the reboot notifier chain */
594 initialized++;
595 register_reboot_notifier(&led_notifier);
596
597 /* Ensure the work is queued */
598 if (led_wq) {
599 queue_delayed_work(led_wq, &led_task, 0);
600 }
601
602 return 0;
603 }
604
605 /*
606 ** register_led_regions()
607 **
608 ** register_led_regions() registers the LCD/LED regions for /procfs.
609 ** At bootup - where the initialisation of the LCD/LED normally happens -
610 ** not all internal structures of request_region() are properly set up,
611 ** so that we delay the led-registration until after busdevices_init()
612 ** has been executed.
613 **
614 */
615
register_led_regions(void)616 void __init register_led_regions(void)
617 {
618 switch (lcd_info.model) {
619 case DISPLAY_MODEL_LCD:
620 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
621 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
622 break;
623 case DISPLAY_MODEL_LASI:
624 case DISPLAY_MODEL_OLD_ASP:
625 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
626 break;
627 }
628 }
629
630
631 /*
632 **
633 ** lcd_print()
634 **
635 ** Displays the given string on the LCD-Display of newer machines.
636 ** lcd_print() disables/enables the timer-based led work queue to
637 ** avoid a race condition while writing the CMD/DATA register pair.
638 **
639 */
lcd_print(const char * str)640 int lcd_print( const char *str )
641 {
642 int i;
643
644 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
645 return 0;
646
647 /* temporarily disable the led work task */
648 if (led_wq)
649 cancel_delayed_work_sync(&led_task);
650
651 /* copy display string to buffer for procfs */
652 strscpy(lcd_text, str, sizeof(lcd_text));
653
654 /* Set LCD Cursor to 1st character */
655 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
656 udelay(lcd_info.min_cmd_delay);
657
658 /* Print the string */
659 for (i=0; i < lcd_info.lcd_width; i++) {
660 if (str && *str)
661 gsc_writeb(*str++, LCD_DATA_REG);
662 else
663 gsc_writeb(' ', LCD_DATA_REG);
664 udelay(lcd_info.min_cmd_delay);
665 }
666
667 /* re-queue the work */
668 if (led_wq) {
669 queue_delayed_work(led_wq, &led_task, 0);
670 }
671
672 return lcd_info.lcd_width;
673 }
674
675 /*
676 ** led_init()
677 **
678 ** led_init() is called very early in the bootup-process from setup.c
679 ** and asks the PDC for an usable chassis LCD or LED.
680 ** If the PDC doesn't return any info, then the LED
681 ** is detected by lasi.c or asp.c and registered with the
682 ** above functions lasi_led_init() or asp_led_init().
683 ** KittyHawk machines have often a buggy PDC, so that
684 ** we explicitly check for those machines here.
685 */
686
led_init(void)687 int __init led_init(void)
688 {
689 struct pdc_chassis_info chassis_info;
690 int ret;
691
692 snprintf(lcd_text_default, sizeof(lcd_text_default),
693 "Linux %s", init_utsname()->release);
694
695 /* Work around the buggy PDC of KittyHawk-machines */
696 switch (CPU_HVERSION) {
697 case 0x580: /* KittyHawk DC2-100 (K100) */
698 case 0x581: /* KittyHawk DC3-120 (K210) */
699 case 0x582: /* KittyHawk DC3 100 (K400) */
700 case 0x583: /* KittyHawk DC3 120 (K410) */
701 case 0x58B: /* KittyHawk DC2 100 (K200) */
702 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
703 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
704 lcd_no_led_support = 1;
705 goto found; /* use the preinitialized values of lcd_info */
706 }
707
708 /* initialize the struct, so that we can check for valid return values */
709 lcd_info.model = DISPLAY_MODEL_NONE;
710 chassis_info.actcnt = chassis_info.maxcnt = 0;
711
712 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
713 if (ret == PDC_OK) {
714 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
715 "lcd_width=%d, cmd_delay=%u,\n"
716 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
717 __FILE__, lcd_info.model,
718 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
719 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
720 lcd_info.lcd_width, lcd_info.min_cmd_delay,
721 __FILE__, sizeof(lcd_info),
722 chassis_info.actcnt, chassis_info.maxcnt));
723 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
724 __FILE__, lcd_info.lcd_cmd_reg_addr,
725 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
726 lcd_info.reset_cmd2, lcd_info.act_enable ));
727
728 /* check the results. Some machines have a buggy PDC */
729 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
730 goto not_found;
731
732 switch (lcd_info.model) {
733 case DISPLAY_MODEL_LCD: /* LCD display */
734 if (chassis_info.actcnt <
735 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
736 goto not_found;
737 if (!lcd_info.act_enable) {
738 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
739 goto not_found;
740 }
741 break;
742
743 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
744 printk(KERN_INFO "PDC reported no LCD or LED.\n");
745 goto not_found;
746
747 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
748 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
749 goto not_found;
750 break;
751
752 default:
753 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
754 lcd_info.model);
755 goto not_found;
756 } /* switch() */
757
758 found:
759 /* register the LCD/LED driver */
760 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
761 return 0;
762
763 } else { /* if() */
764 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
765 }
766
767 not_found:
768 lcd_info.model = DISPLAY_MODEL_NONE;
769 return 1;
770 }
771
led_exit(void)772 static void __exit led_exit(void)
773 {
774 unregister_reboot_notifier(&led_notifier);
775 return;
776 }
777
778 #ifdef CONFIG_PROC_FS
779 module_init(led_create_procfs)
780 #endif
781