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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 2001-2004 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>
Grant Grundler34994952005-10-21 22:46:18 -040021 * - Switch from using a tasklet to a work queue, so the led_LCD_driver
22 * can sleep.
23 * David Pye <dmp@davidmpye.dyndns.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
25
26#include <linux/config.h>
27#include <linux/module.h>
28#include <linux/stddef.h> /* for offsetof() */
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/ioport.h>
32#include <linux/utsname.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/ctype.h>
42#include <linux/blkdev.h>
Grant Grundler34994952005-10-21 22:46:18 -040043#include <linux/workqueue.h>
Herbert Xue5ed6392005-10-03 14:35:55 -070044#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <asm/io.h>
46#include <asm/processor.h>
47#include <asm/hardware.h>
48#include <asm/param.h> /* HZ */
49#include <asm/led.h>
50#include <asm/pdc.h>
51#include <asm/uaccess.h>
52
53/* The control of the LEDs and LCDs on PARISC-machines have to be done
Grant Grundler34994952005-10-21 22:46:18 -040054 completely in software. The necessary calculations are done in a work queue
55 task which is scheduled regularly, and since the calculations may consume a
56 relatively large amount of CPU time, some of the calculations can be
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 turned off with the following variables (controlled via procfs) */
58
59static int led_type = -1;
Grant Grundler34994952005-10-21 22:46:18 -040060static unsigned char lastleds; /* LED state from most recent update */
61static unsigned int led_heartbeat = 1;
62static unsigned int led_diskio = 1;
63static unsigned int led_lanrxtx = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static char lcd_text[32];
65static char lcd_text_default[32];
66
Grant Grundler34994952005-10-21 22:46:18 -040067
68static struct workqueue_struct *led_wq;
69static void led_work_func(void *);
70static DECLARE_WORK(led_task, led_work_func, NULL);
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#if 0
73#define DPRINTK(x) printk x
74#else
75#define DPRINTK(x)
76#endif
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078struct lcd_block {
79 unsigned char command; /* stores the command byte */
80 unsigned char on; /* value for turning LED on */
81 unsigned char off; /* value for turning LED off */
82};
83
84/* Structure returned by PDC_RETURN_CHASSIS_INFO */
85/* NOTE: we use unsigned long:16 two times, since the following member
86 lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
87struct pdc_chassis_lcd_info_ret_block {
88 unsigned long model:16; /* DISPLAY_MODEL_XXXX */
89 unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
90 unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */
91 unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
92 unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */
93 unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */
94 unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */
95 unsigned char act_enable; /* 0 = no activity (LCD only) */
96 struct lcd_block heartbeat;
97 struct lcd_block disk_io;
98 struct lcd_block lan_rcv;
99 struct lcd_block lan_tx;
100 char _pad;
101};
102
103
104/* LCD_CMD and LCD_DATA for KittyHawk machines */
105#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */
106#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
107
108/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
109 * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
110static struct pdc_chassis_lcd_info_ret_block
111lcd_info __attribute__((aligned(8))) =
112{
113 .model = DISPLAY_MODEL_LCD,
114 .lcd_width = 16,
115 .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD,
116 .lcd_data_reg_addr = KITTYHAWK_LCD_DATA,
117 .min_cmd_delay = 40,
118 .reset_cmd1 = 0x80,
119 .reset_cmd2 = 0xc0,
120};
121
122
123/* direct access to some of the lcd_info variables */
124#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
125#define LCD_DATA_REG lcd_info.lcd_data_reg_addr
126#define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
127
Grant Grundler34994952005-10-21 22:46:18 -0400128#define LED_HASLCD 1
129#define LED_NOLCD 0
130
131/* The workqueue must be created at init-time */
132static int start_task(void)
133{
134 /* Display the default text now */
135 if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
136
137 /* Create the work queue and queue the LED task */
138 led_wq = create_singlethread_workqueue("led_wq");
139 queue_work(led_wq, &led_task);
140
141 return 0;
142}
143
144device_initcall(start_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146/* ptr to LCD/LED-specific function */
147static void (*led_func_ptr) (unsigned char);
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#ifdef CONFIG_PROC_FS
150static int led_proc_read(char *page, char **start, off_t off, int count,
151 int *eof, void *data)
152{
153 char *out = page;
154 int len;
155
156 switch ((long)data)
157 {
158 case LED_NOLCD:
159 out += sprintf(out, "Heartbeat: %d\n", led_heartbeat);
160 out += sprintf(out, "Disk IO: %d\n", led_diskio);
161 out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx);
162 break;
163 case LED_HASLCD:
164 out += sprintf(out, "%s\n", lcd_text);
165 break;
166 default:
167 *eof = 1;
168 return 0;
169 }
170
171 len = out - page - off;
172 if (len < count) {
173 *eof = 1;
174 if (len <= 0) return 0;
175 } else {
176 len = count;
177 }
178 *start = page + off;
179 return len;
180}
181
182static int led_proc_write(struct file *file, const char *buf,
183 unsigned long count, void *data)
184{
185 char *cur, lbuf[count + 1];
186 int d;
187
188 if (!capable(CAP_SYS_ADMIN))
189 return -EACCES;
190
191 memset(lbuf, 0, count + 1);
192
193 if (copy_from_user(lbuf, buf, count))
194 return -EFAULT;
195
196 cur = lbuf;
197
198 /* skip initial spaces */
199 while (*cur && isspace(*cur))
200 {
201 cur++;
202 }
203
204 switch ((long)data)
205 {
206 case LED_NOLCD:
207 d = *cur++ - '0';
208 if (d != 0 && d != 1) goto parse_error;
209 led_heartbeat = d;
210
211 if (*cur++ != ' ') goto parse_error;
212
213 d = *cur++ - '0';
214 if (d != 0 && d != 1) goto parse_error;
215 led_diskio = d;
216
217 if (*cur++ != ' ') goto parse_error;
218
219 d = *cur++ - '0';
220 if (d != 0 && d != 1) goto parse_error;
221 led_lanrxtx = d;
222
223 break;
224 case LED_HASLCD:
225 if (*cur && cur[strlen(cur)-1] == '\n')
226 cur[strlen(cur)-1] = 0;
227 if (*cur == 0)
228 cur = lcd_text_default;
229 lcd_print(cur);
230 break;
231 default:
232 return 0;
233 }
234
235 return count;
236
237parse_error:
238 if ((long)data == LED_NOLCD)
239 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
240 return -EINVAL;
241}
242
243static int __init led_create_procfs(void)
244{
245 struct proc_dir_entry *proc_pdc_root = NULL;
246 struct proc_dir_entry *ent;
247
248 if (led_type == -1) return -1;
249
250 proc_pdc_root = proc_mkdir("pdc", 0);
251 if (!proc_pdc_root) return -1;
252 proc_pdc_root->owner = THIS_MODULE;
253 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
254 if (!ent) return -1;
255 ent->nlink = 1;
256 ent->data = (void *)LED_NOLCD; /* LED */
257 ent->read_proc = led_proc_read;
258 ent->write_proc = led_proc_write;
259 ent->owner = THIS_MODULE;
260
261 if (led_type == LED_HASLCD)
262 {
263 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
264 if (!ent) return -1;
265 ent->nlink = 1;
266 ent->data = (void *)LED_HASLCD; /* LCD */
267 ent->read_proc = led_proc_read;
268 ent->write_proc = led_proc_write;
269 ent->owner = THIS_MODULE;
270 }
271
272 return 0;
273}
274#endif
275
276/*
277 **
278 ** led_ASP_driver()
279 **
280 */
281#define LED_DATA 0x01 /* data to shift (0:on 1:off) */
282#define LED_STROBE 0x02 /* strobe to clock data */
283static void led_ASP_driver(unsigned char leds)
284{
285 int i;
286
287 leds = ~leds;
288 for (i = 0; i < 8; i++) {
289 unsigned char value;
290 value = (leds & 0x80) >> 7;
291 gsc_writeb( value, LED_DATA_REG );
292 gsc_writeb( value | LED_STROBE, LED_DATA_REG );
293 leds <<= 1;
294 }
295}
296
297
298/*
299 **
300 ** led_LASI_driver()
301 **
302 */
303static void led_LASI_driver(unsigned char leds)
304{
305 leds = ~leds;
306 gsc_writeb( leds, LED_DATA_REG );
307}
308
309
310/*
311 **
312 ** led_LCD_driver()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 **
314 */
315static void led_LCD_driver(unsigned char leds)
316{
Grant Grundler34994952005-10-21 22:46:18 -0400317 static int i;
318 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
319 LED_LAN_RCV, LED_LAN_TX };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Grant Grundler34994952005-10-21 22:46:18 -0400321 static struct lcd_block * blockp[4] = {
322 &lcd_info.heartbeat,
323 &lcd_info.disk_io,
324 &lcd_info.lan_rcv,
325 &lcd_info.lan_tx
326 };
327
328 /* Convert min_cmd_delay to milliseconds */
329 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
330
331 for (i=0; i<4; ++i)
332 {
333 if ((leds & mask[i]) != (lastleds & mask[i]))
334 {
335 gsc_writeb( blockp[i]->command, LCD_CMD_REG );
336 msleep(msec_cmd_delay);
337
338 gsc_writeb( leds & mask[i] ? blockp[i]->on :
339 blockp[i]->off, LCD_DATA_REG );
340 msleep(msec_cmd_delay);
341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
343}
344
345
346/*
347 **
348 ** led_get_net_activity()
349 **
350 ** calculate if there was TX- or RX-troughput on the network interfaces
351 ** (analog to dev_get_info() from net/core/dev.c)
352 **
353 */
354static __inline__ int led_get_net_activity(void)
355{
356#ifndef CONFIG_NET
357 return 0;
358#else
359 static unsigned long rx_total_last, tx_total_last;
360 unsigned long rx_total, tx_total;
361 struct net_device *dev;
362 int retval;
363
364 rx_total = tx_total = 0;
365
Grant Grundler34994952005-10-21 22:46:18 -0400366 /* we are running as a workqueue task, so locking dev_base
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 * for reading should be OK */
368 read_lock(&dev_base_lock);
Herbert Xue5ed6392005-10-03 14:35:55 -0700369 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 for (dev = dev_base; dev; dev = dev->next) {
371 struct net_device_stats *stats;
Herbert Xue5ed6392005-10-03 14:35:55 -0700372 struct in_device *in_dev = __in_dev_get_rcu(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 if (!in_dev || !in_dev->ifa_list)
374 continue;
375 if (LOOPBACK(in_dev->ifa_list->ifa_local))
376 continue;
377 if (!dev->get_stats)
378 continue;
379 stats = dev->get_stats(dev);
380 rx_total += stats->rx_packets;
381 tx_total += stats->tx_packets;
382 }
Herbert Xue5ed6392005-10-03 14:35:55 -0700383 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 read_unlock(&dev_base_lock);
385
386 retval = 0;
387
388 if (rx_total != rx_total_last) {
389 rx_total_last = rx_total;
390 retval |= LED_LAN_RCV;
391 }
392
393 if (tx_total != tx_total_last) {
394 tx_total_last = tx_total;
395 retval |= LED_LAN_TX;
396 }
397
398 return retval;
399#endif
400}
401
402
403/*
404 **
405 ** led_get_diskio_activity()
406 **
407 ** calculate if there was disk-io in the system
408 **
409 */
410static __inline__ int led_get_diskio_activity(void)
411{
412 static unsigned long last_pgpgin, last_pgpgout;
413 struct page_state pgstat;
414 int changed;
Grant Grundler34994952005-10-21 22:46:18 -0400415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 get_full_page_state(&pgstat); /* get no of sectors in & out */
417
418 /* Just use a very simple calculation here. Do not care about overflow,
419 since we only want to know if there was activity or not. */
420 changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout);
421 last_pgpgin = pgstat.pgpgin;
422 last_pgpgout = pgstat.pgpgout;
Grant Grundler34994952005-10-21 22:46:18 -0400423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 return (changed ? LED_DISK_IO : 0);
425}
426
427
428
429/*
Grant Grundler34994952005-10-21 22:46:18 -0400430 ** led_work_func()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 **
Grant Grundler34994952005-10-21 22:46:18 -0400432 ** manages when and which chassis LCD/LED gets updated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 TODO:
435 - display load average (older machines like 715/64 have 4 "free" LED's for that)
436 - optimizations
437 */
438
Grant Grundler34994952005-10-21 22:46:18 -0400439#define HEARTBEAT_LEN (HZ*10/100)
440#define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441#define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
442
Grant Grundler34994952005-10-21 22:46:18 -0400443#define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Grant Grundler34994952005-10-21 22:46:18 -0400445static void led_work_func (void *unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Grant Grundler34994952005-10-21 22:46:18 -0400447 static unsigned long last_jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 static unsigned long count_HZ; /* counter in range 0..HZ */
Grant Grundler34994952005-10-21 22:46:18 -0400449 unsigned char currentleds = 0; /* stores current value of the LEDs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451 /* exit if not initialized */
452 if (!led_func_ptr)
453 return;
454
Grant Grundler34994952005-10-21 22:46:18 -0400455 /* increment the heartbeat timekeeper */
456 count_HZ += jiffies - last_jiffies;
457 last_jiffies = jiffies;
458 if (count_HZ >= HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 count_HZ = 0;
460
Grant Grundler34994952005-10-21 22:46:18 -0400461 if (likely(led_heartbeat))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 {
Grant Grundler34994952005-10-21 22:46:18 -0400463 /* flash heartbeat-LED like a real heart
464 * (2 x short then a long delay)
465 */
466 if (count_HZ < HEARTBEAT_LEN ||
467 (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
468 count_HZ < HEARTBEAT_2ND_RANGE_END))
469 currentleds |= LED_HEARTBEAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 }
471
Grant Grundler34994952005-10-21 22:46:18 -0400472 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
473 if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 /* blink all LEDs twice a second if we got an Oops (HPMC) */
Grant Grundler34994952005-10-21 22:46:18 -0400476 if (unlikely(oops_in_progress))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff;
Grant Grundler34994952005-10-21 22:46:18 -0400478
479 if (currentleds != lastleds)
480 {
481 led_func_ptr(currentleds); /* Update the LCD/LEDs */
482 lastleds = currentleds;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
Grant Grundler34994952005-10-21 22:46:18 -0400484
485 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488/*
489 ** led_halt()
490 **
491 ** called by the reboot notifier chain at shutdown and stops all
492 ** LED/LCD activities.
493 **
494 */
495
496static int led_halt(struct notifier_block *, unsigned long, void *);
497
498static struct notifier_block led_notifier = {
499 .notifier_call = led_halt,
500};
501
502static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
503{
504 char *txt;
505
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
Grant Grundler34994952005-10-21 22:46:18 -0400516 /* Cancel the work item and delete the queue */
517 if (led_wq) {
518 cancel_rearming_delayed_workqueue(led_wq, &led_task);
519 destroy_workqueue(led_wq);
520 led_wq = NULL;
521 }
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 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 unregister_reboot_notifier(&led_notifier);
530 return NOTIFY_OK;
531}
532
533/*
534 ** register_led_driver()
535 **
536 ** registers an external LED or LCD for usage by this driver.
537 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
538 **
539 */
540
541int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
542{
543 static int initialized;
544
545 if (initialized || !data_reg)
546 return 1;
547
548 lcd_info.model = model; /* store the values */
549 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
550
551 switch (lcd_info.model) {
552 case DISPLAY_MODEL_LCD:
553 LCD_DATA_REG = data_reg;
554 printk(KERN_INFO "LCD display at %lx,%lx registered\n",
555 LCD_CMD_REG , LCD_DATA_REG);
556 led_func_ptr = led_LCD_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 led_type = LED_HASLCD;
558 break;
559
560 case DISPLAY_MODEL_LASI:
561 LED_DATA_REG = data_reg;
562 led_func_ptr = led_LASI_driver;
563 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);
564 led_type = LED_NOLCD;
565 break;
566
567 case DISPLAY_MODEL_OLD_ASP:
568 LED_DATA_REG = data_reg;
569 led_func_ptr = led_ASP_driver;
570 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",
571 LED_DATA_REG);
572 led_type = LED_NOLCD;
573 break;
574
575 default:
576 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
577 __FUNCTION__, lcd_info.model);
578 return 1;
579 }
580
581 /* mark the LCD/LED driver now as initialized and
582 * register to the reboot notifier chain */
583 initialized++;
584 register_reboot_notifier(&led_notifier);
585
Grant Grundler34994952005-10-21 22:46:18 -0400586 /* Ensure the work is queued */
587 if (led_wq) {
588 queue_work(led_wq, &led_task);
589 }
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 return 0;
592}
593
594/*
595 ** register_led_regions()
596 **
597 ** register_led_regions() registers the LCD/LED regions for /procfs.
598 ** At bootup - where the initialisation of the LCD/LED normally happens -
599 ** not all internal structures of request_region() are properly set up,
600 ** so that we delay the led-registration until after busdevices_init()
601 ** has been executed.
602 **
603 */
604
605void __init register_led_regions(void)
606{
607 switch (lcd_info.model) {
608 case DISPLAY_MODEL_LCD:
609 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
610 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
611 break;
612 case DISPLAY_MODEL_LASI:
613 case DISPLAY_MODEL_OLD_ASP:
614 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
615 break;
616 }
617}
618
619
620/*
621 **
622 ** lcd_print()
623 **
624 ** Displays the given string on the LCD-Display of newer machines.
Grant Grundler34994952005-10-21 22:46:18 -0400625 ** lcd_print() disables/enables the timer-based led work queue to
626 ** avoid a race condition while writing the CMD/DATA register pair.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 **
628 */
629int lcd_print( char *str )
630{
631 int i;
632
633 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
634 return 0;
635
Grant Grundler34994952005-10-21 22:46:18 -0400636 /* temporarily disable the led work task */
637 if (led_wq)
638 cancel_rearming_delayed_workqueue(led_wq, &led_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 /* copy display string to buffer for procfs */
641 strlcpy(lcd_text, str, sizeof(lcd_text));
Grant Grundler34994952005-10-21 22:46:18 -0400642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 /* Set LCD Cursor to 1st character */
644 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
645 udelay(lcd_info.min_cmd_delay);
646
647 /* Print the string */
648 for (i=0; i < lcd_info.lcd_width; i++) {
649 if (str && *str)
650 gsc_writeb(*str++, LCD_DATA_REG);
651 else
652 gsc_writeb(' ', LCD_DATA_REG);
653 udelay(lcd_info.min_cmd_delay);
654 }
655
Grant Grundler34994952005-10-21 22:46:18 -0400656 /* re-queue the work */
657 if (led_wq) {
658 queue_work(led_wq, &led_task);
659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 return lcd_info.lcd_width;
662}
663
664/*
665 ** led_init()
666 **
667 ** led_init() is called very early in the bootup-process from setup.c
668 ** and asks the PDC for an usable chassis LCD or LED.
669 ** If the PDC doesn't return any info, then the LED
670 ** is detected by lasi.c or asp.c and registered with the
671 ** above functions lasi_led_init() or asp_led_init().
672 ** KittyHawk machines have often a buggy PDC, so that
673 ** we explicitly check for those machines here.
674 */
675
676int __init led_init(void)
677{
678 struct pdc_chassis_info chassis_info;
679 int ret;
680
681 snprintf(lcd_text_default, sizeof(lcd_text_default),
682 "Linux %s", system_utsname.release);
683
684 /* Work around the buggy PDC of KittyHawk-machines */
685 switch (CPU_HVERSION) {
686 case 0x580: /* KittyHawk DC2-100 (K100) */
687 case 0x581: /* KittyHawk DC3-120 (K210) */
688 case 0x582: /* KittyHawk DC3 100 (K400) */
689 case 0x583: /* KittyHawk DC3 120 (K410) */
690 case 0x58B: /* KittyHawk DC2 100 (K200) */
691 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
692 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
693 goto found; /* use the preinitialized values of lcd_info */
694 }
695
696 /* initialize the struct, so that we can check for valid return values */
697 lcd_info.model = DISPLAY_MODEL_NONE;
698 chassis_info.actcnt = chassis_info.maxcnt = 0;
699
700 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
701 if (ret == PDC_OK) {
702 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
703 "lcd_width=%d, cmd_delay=%u,\n"
704 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
705 __FILE__, lcd_info.model,
706 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
707 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
708 lcd_info.lcd_width, lcd_info.min_cmd_delay,
709 __FILE__, sizeof(lcd_info),
710 chassis_info.actcnt, chassis_info.maxcnt));
711 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
712 __FILE__, lcd_info.lcd_cmd_reg_addr,
713 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
714 lcd_info.reset_cmd2, lcd_info.act_enable ));
715
716 /* check the results. Some machines have a buggy PDC */
717 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
718 goto not_found;
719
720 switch (lcd_info.model) {
721 case DISPLAY_MODEL_LCD: /* LCD display */
722 if (chassis_info.actcnt <
723 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
724 goto not_found;
725 if (!lcd_info.act_enable) {
726 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
727 goto not_found;
728 }
729 break;
730
731 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
732 printk(KERN_INFO "PDC reported no LCD or LED.\n");
733 goto not_found;
734
735 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
736 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
737 goto not_found;
738 break;
739
740 default:
741 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
742 lcd_info.model);
743 goto not_found;
744 } /* switch() */
745
746found:
747 /* register the LCD/LED driver */
748 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
749 return 0;
750
751 } else { /* if() */
752 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
753 }
754
755not_found:
756 lcd_info.model = DISPLAY_MODEL_NONE;
757 return 1;
758}
759
760#ifdef CONFIG_PROC_FS
761module_init(led_create_procfs)
762#endif