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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>
Helge Deller8039de12006-01-10 20:35:03 -05006 * (c) Copyright 2001-2005 Helge Deller <deller@gmx.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * (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
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#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>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080032#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#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
Helge Deller8039de12006-01-10 20:35:03 -050059static int led_type __read_mostly = -1;
Grant Grundler34994952005-10-21 22:46:18 -040060static unsigned char lastleds; /* LED state from most recent update */
Helge Deller8039de12006-01-10 20:35:03 -050061static unsigned int led_heartbeat __read_mostly = 1;
62static unsigned int led_diskio __read_mostly = 1;
63static unsigned int led_lanrxtx __read_mostly = 1;
64static char lcd_text[32] __read_mostly;
65static char lcd_text_default[32] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Grant Grundler34994952005-10-21 22:46:18 -040067
68static struct workqueue_struct *led_wq;
David Howells6858f3b2006-12-07 15:31:38 +000069static void led_work_func(struct work_struct *);
70static DECLARE_DELAYED_WORK(led_task, led_work_func);
Grant Grundler34994952005-10-21 22:46:18 -040071
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
Helge Deller8039de12006-01-10 20:35:03 -0500111lcd_info __attribute__((aligned(8))) __read_mostly =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
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");
David Howells6858f3b2006-12-07 15:31:38 +0000139 queue_delayed_work(led_wq, &led_task, 0);
Grant Grundler34994952005-10-21 22:46:18 -0400140
141 return 0;
142}
143
144device_initcall(start_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146/* ptr to LCD/LED-specific function */
Helge Deller8039de12006-01-10 20:35:03 -0500147static void (*led_func_ptr) (unsigned char) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 switch ((long)data)
199 {
200 case LED_NOLCD:
201 d = *cur++ - '0';
202 if (d != 0 && d != 1) goto parse_error;
203 led_heartbeat = d;
204
205 if (*cur++ != ' ') goto parse_error;
206
207 d = *cur++ - '0';
208 if (d != 0 && d != 1) goto parse_error;
209 led_diskio = d;
210
211 if (*cur++ != ' ') goto parse_error;
212
213 d = *cur++ - '0';
214 if (d != 0 && d != 1) goto parse_error;
215 led_lanrxtx = d;
216
217 break;
218 case LED_HASLCD:
219 if (*cur && cur[strlen(cur)-1] == '\n')
220 cur[strlen(cur)-1] = 0;
221 if (*cur == 0)
222 cur = lcd_text_default;
223 lcd_print(cur);
224 break;
225 default:
226 return 0;
227 }
228
229 return count;
230
231parse_error:
232 if ((long)data == LED_NOLCD)
233 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
234 return -EINVAL;
235}
236
237static int __init led_create_procfs(void)
238{
239 struct proc_dir_entry *proc_pdc_root = NULL;
240 struct proc_dir_entry *ent;
241
242 if (led_type == -1) return -1;
243
244 proc_pdc_root = proc_mkdir("pdc", 0);
245 if (!proc_pdc_root) return -1;
246 proc_pdc_root->owner = THIS_MODULE;
247 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
248 if (!ent) return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 ent->data = (void *)LED_NOLCD; /* LED */
250 ent->read_proc = led_proc_read;
251 ent->write_proc = led_proc_write;
252 ent->owner = THIS_MODULE;
253
254 if (led_type == LED_HASLCD)
255 {
256 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
257 if (!ent) return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 ent->data = (void *)LED_HASLCD; /* LCD */
259 ent->read_proc = led_proc_read;
260 ent->write_proc = led_proc_write;
261 ent->owner = THIS_MODULE;
262 }
263
264 return 0;
265}
266#endif
267
268/*
269 **
270 ** led_ASP_driver()
271 **
272 */
273#define LED_DATA 0x01 /* data to shift (0:on 1:off) */
274#define LED_STROBE 0x02 /* strobe to clock data */
275static void led_ASP_driver(unsigned char leds)
276{
277 int i;
278
279 leds = ~leds;
280 for (i = 0; i < 8; i++) {
281 unsigned char value;
282 value = (leds & 0x80) >> 7;
283 gsc_writeb( value, LED_DATA_REG );
284 gsc_writeb( value | LED_STROBE, LED_DATA_REG );
285 leds <<= 1;
286 }
287}
288
289
290/*
291 **
292 ** led_LASI_driver()
293 **
294 */
295static void led_LASI_driver(unsigned char leds)
296{
297 leds = ~leds;
298 gsc_writeb( leds, LED_DATA_REG );
299}
300
301
302/*
303 **
304 ** led_LCD_driver()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 **
306 */
307static void led_LCD_driver(unsigned char leds)
308{
Grant Grundler34994952005-10-21 22:46:18 -0400309 static int i;
310 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
311 LED_LAN_RCV, LED_LAN_TX };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Grant Grundler34994952005-10-21 22:46:18 -0400313 static struct lcd_block * blockp[4] = {
314 &lcd_info.heartbeat,
315 &lcd_info.disk_io,
316 &lcd_info.lan_rcv,
317 &lcd_info.lan_tx
318 };
319
320 /* Convert min_cmd_delay to milliseconds */
321 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
322
323 for (i=0; i<4; ++i)
324 {
325 if ((leds & mask[i]) != (lastleds & mask[i]))
326 {
327 gsc_writeb( blockp[i]->command, LCD_CMD_REG );
328 msleep(msec_cmd_delay);
329
330 gsc_writeb( leds & mask[i] ? blockp[i]->on :
331 blockp[i]->off, LCD_DATA_REG );
332 msleep(msec_cmd_delay);
333 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
335}
336
337
338/*
339 **
340 ** led_get_net_activity()
341 **
Adrian Bunk93b1fae2006-01-10 00:13:33 +0100342 ** calculate if there was TX- or RX-throughput on the network interfaces
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 ** (analog to dev_get_info() from net/core/dev.c)
344 **
345 */
346static __inline__ int led_get_net_activity(void)
347{
348#ifndef CONFIG_NET
349 return 0;
350#else
351 static unsigned long rx_total_last, tx_total_last;
352 unsigned long rx_total, tx_total;
353 struct net_device *dev;
354 int retval;
355
356 rx_total = tx_total = 0;
357
Grant Grundler34994952005-10-21 22:46:18 -0400358 /* we are running as a workqueue task, so locking dev_base
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 * for reading should be OK */
360 read_lock(&dev_base_lock);
Herbert Xue5ed6392005-10-03 14:35:55 -0700361 rcu_read_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -0700362 for_each_netdev(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 struct net_device_stats *stats;
Herbert Xue5ed6392005-10-03 14:35:55 -0700364 struct in_device *in_dev = __in_dev_get_rcu(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (!in_dev || !in_dev->ifa_list)
366 continue;
Joe Perches17159b02007-12-16 20:28:24 -0800367 if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 stats = dev->get_stats(dev);
370 rx_total += stats->rx_packets;
371 tx_total += stats->tx_packets;
372 }
Herbert Xue5ed6392005-10-03 14:35:55 -0700373 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 read_unlock(&dev_base_lock);
375
376 retval = 0;
377
378 if (rx_total != rx_total_last) {
379 rx_total_last = rx_total;
380 retval |= LED_LAN_RCV;
381 }
382
383 if (tx_total != tx_total_last) {
384 tx_total_last = tx_total;
385 retval |= LED_LAN_TX;
386 }
387
388 return retval;
389#endif
390}
391
392
393/*
394 **
395 ** led_get_diskio_activity()
396 **
397 ** calculate if there was disk-io in the system
398 **
399 */
400static __inline__ int led_get_diskio_activity(void)
401{
402 static unsigned long last_pgpgin, last_pgpgout;
Christoph Lameterf8891e52006-06-30 01:55:45 -0700403 unsigned long events[NR_VM_EVENT_ITEMS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 int changed;
Grant Grundler34994952005-10-21 22:46:18 -0400405
Christoph Lameterf8891e52006-06-30 01:55:45 -0700406 all_vm_events(events);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 /* Just use a very simple calculation here. Do not care about overflow,
409 since we only want to know if there was activity or not. */
Christoph Lameterf8891e52006-06-30 01:55:45 -0700410 changed = (events[PGPGIN] != last_pgpgin) ||
411 (events[PGPGOUT] != last_pgpgout);
412 last_pgpgin = events[PGPGIN];
413 last_pgpgout = events[PGPGOUT];
Grant Grundler34994952005-10-21 22:46:18 -0400414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return (changed ? LED_DISK_IO : 0);
416}
417
418
419
420/*
Grant Grundler34994952005-10-21 22:46:18 -0400421 ** led_work_func()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 **
Grant Grundler34994952005-10-21 22:46:18 -0400423 ** manages when and which chassis LCD/LED gets updated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 TODO:
426 - display load average (older machines like 715/64 have 4 "free" LED's for that)
427 - optimizations
428 */
429
Grant Grundler34994952005-10-21 22:46:18 -0400430#define HEARTBEAT_LEN (HZ*10/100)
431#define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432#define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
433
Grant Grundler34994952005-10-21 22:46:18 -0400434#define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
David Howells6858f3b2006-12-07 15:31:38 +0000436static void led_work_func (struct work_struct *unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Grant Grundler34994952005-10-21 22:46:18 -0400438 static unsigned long last_jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 static unsigned long count_HZ; /* counter in range 0..HZ */
Grant Grundler34994952005-10-21 22:46:18 -0400440 unsigned char currentleds = 0; /* stores current value of the LEDs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 /* exit if not initialized */
443 if (!led_func_ptr)
444 return;
445
Grant Grundler34994952005-10-21 22:46:18 -0400446 /* increment the heartbeat timekeeper */
447 count_HZ += jiffies - last_jiffies;
448 last_jiffies = jiffies;
449 if (count_HZ >= HZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 count_HZ = 0;
451
Grant Grundler34994952005-10-21 22:46:18 -0400452 if (likely(led_heartbeat))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 {
Grant Grundler34994952005-10-21 22:46:18 -0400454 /* flash heartbeat-LED like a real heart
455 * (2 x short then a long delay)
456 */
457 if (count_HZ < HEARTBEAT_LEN ||
458 (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
459 count_HZ < HEARTBEAT_2ND_RANGE_END))
460 currentleds |= LED_HEARTBEAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 }
462
Grant Grundler34994952005-10-21 22:46:18 -0400463 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
464 if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 /* blink all LEDs twice a second if we got an Oops (HPMC) */
Grant Grundler34994952005-10-21 22:46:18 -0400467 if (unlikely(oops_in_progress))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff;
Grant Grundler34994952005-10-21 22:46:18 -0400469
470 if (currentleds != lastleds)
471 {
472 led_func_ptr(currentleds); /* Update the LCD/LEDs */
473 lastleds = currentleds;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 }
Grant Grundler34994952005-10-21 22:46:18 -0400475
476 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479/*
480 ** led_halt()
481 **
482 ** called by the reboot notifier chain at shutdown and stops all
483 ** LED/LCD activities.
484 **
485 */
486
487static int led_halt(struct notifier_block *, unsigned long, void *);
488
489static struct notifier_block led_notifier = {
490 .notifier_call = led_halt,
491};
Alan Sterne041c682006-03-27 01:16:30 -0800492static int notifier_disabled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
495{
496 char *txt;
Alan Sterne041c682006-03-27 01:16:30 -0800497
498 if (notifier_disabled)
499 return NOTIFY_OK;
500
501 notifier_disabled = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 switch (event) {
503 case SYS_RESTART: txt = "SYSTEM RESTART";
504 break;
505 case SYS_HALT: txt = "SYSTEM HALT";
506 break;
507 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
508 break;
509 default: return NOTIFY_DONE;
510 }
511
Grant Grundler34994952005-10-21 22:46:18 -0400512 /* Cancel the work item and delete the queue */
513 if (led_wq) {
514 cancel_rearming_delayed_workqueue(led_wq, &led_task);
515 destroy_workqueue(led_wq);
516 led_wq = NULL;
517 }
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (lcd_info.model == DISPLAY_MODEL_LCD)
520 lcd_print(txt);
521 else
522 if (led_func_ptr)
523 led_func_ptr(0xff); /* turn all LEDs ON */
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 return NOTIFY_OK;
526}
527
528/*
529 ** register_led_driver()
530 **
531 ** registers an external LED or LCD for usage by this driver.
532 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
533 **
534 */
535
536int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
537{
538 static int initialized;
539
540 if (initialized || !data_reg)
541 return 1;
542
543 lcd_info.model = model; /* store the values */
544 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
545
546 switch (lcd_info.model) {
547 case DISPLAY_MODEL_LCD:
548 LCD_DATA_REG = data_reg;
549 printk(KERN_INFO "LCD display at %lx,%lx registered\n",
550 LCD_CMD_REG , LCD_DATA_REG);
551 led_func_ptr = led_LCD_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 led_type = LED_HASLCD;
553 break;
554
555 case DISPLAY_MODEL_LASI:
556 LED_DATA_REG = data_reg;
557 led_func_ptr = led_LASI_driver;
558 printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);
559 led_type = LED_NOLCD;
560 break;
561
562 case DISPLAY_MODEL_OLD_ASP:
563 LED_DATA_REG = data_reg;
564 led_func_ptr = led_ASP_driver;
565 printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",
566 LED_DATA_REG);
567 led_type = LED_NOLCD;
568 break;
569
570 default:
571 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
Harvey Harrisona8043ec2008-05-14 16:21:56 -0700572 __func__, lcd_info.model);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return 1;
574 }
575
576 /* mark the LCD/LED driver now as initialized and
577 * register to the reboot notifier chain */
578 initialized++;
579 register_reboot_notifier(&led_notifier);
580
Grant Grundler34994952005-10-21 22:46:18 -0400581 /* Ensure the work is queued */
582 if (led_wq) {
David Howells6858f3b2006-12-07 15:31:38 +0000583 queue_delayed_work(led_wq, &led_task, 0);
Grant Grundler34994952005-10-21 22:46:18 -0400584 }
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 return 0;
587}
588
589/*
590 ** register_led_regions()
591 **
592 ** register_led_regions() registers the LCD/LED regions for /procfs.
593 ** At bootup - where the initialisation of the LCD/LED normally happens -
594 ** not all internal structures of request_region() are properly set up,
595 ** so that we delay the led-registration until after busdevices_init()
596 ** has been executed.
597 **
598 */
599
600void __init register_led_regions(void)
601{
602 switch (lcd_info.model) {
603 case DISPLAY_MODEL_LCD:
604 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
605 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
606 break;
607 case DISPLAY_MODEL_LASI:
608 case DISPLAY_MODEL_OLD_ASP:
609 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
610 break;
611 }
612}
613
614
615/*
616 **
617 ** lcd_print()
618 **
619 ** Displays the given string on the LCD-Display of newer machines.
Grant Grundler34994952005-10-21 22:46:18 -0400620 ** lcd_print() disables/enables the timer-based led work queue to
621 ** avoid a race condition while writing the CMD/DATA register pair.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 **
623 */
Helge Deller6e16d942007-01-07 16:07:48 +0100624int lcd_print( const char *str )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
626 int i;
627
628 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
629 return 0;
630
Grant Grundler34994952005-10-21 22:46:18 -0400631 /* temporarily disable the led work task */
632 if (led_wq)
633 cancel_rearming_delayed_workqueue(led_wq, &led_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 /* copy display string to buffer for procfs */
636 strlcpy(lcd_text, str, sizeof(lcd_text));
Grant Grundler34994952005-10-21 22:46:18 -0400637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 /* Set LCD Cursor to 1st character */
639 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
640 udelay(lcd_info.min_cmd_delay);
641
642 /* Print the string */
643 for (i=0; i < lcd_info.lcd_width; i++) {
644 if (str && *str)
645 gsc_writeb(*str++, LCD_DATA_REG);
646 else
647 gsc_writeb(' ', LCD_DATA_REG);
648 udelay(lcd_info.min_cmd_delay);
649 }
650
Grant Grundler34994952005-10-21 22:46:18 -0400651 /* re-queue the work */
652 if (led_wq) {
David Howells6858f3b2006-12-07 15:31:38 +0000653 queue_delayed_work(led_wq, &led_task, 0);
Grant Grundler34994952005-10-21 22:46:18 -0400654 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656 return lcd_info.lcd_width;
657}
658
659/*
660 ** led_init()
661 **
662 ** led_init() is called very early in the bootup-process from setup.c
663 ** and asks the PDC for an usable chassis LCD or LED.
664 ** If the PDC doesn't return any info, then the LED
665 ** is detected by lasi.c or asp.c and registered with the
666 ** above functions lasi_led_init() or asp_led_init().
667 ** KittyHawk machines have often a buggy PDC, so that
668 ** we explicitly check for those machines here.
669 */
670
671int __init led_init(void)
672{
673 struct pdc_chassis_info chassis_info;
674 int ret;
675
676 snprintf(lcd_text_default, sizeof(lcd_text_default),
Serge E. Hallyn96b644b2006-10-02 02:18:13 -0700677 "Linux %s", init_utsname()->release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 /* Work around the buggy PDC of KittyHawk-machines */
680 switch (CPU_HVERSION) {
681 case 0x580: /* KittyHawk DC2-100 (K100) */
682 case 0x581: /* KittyHawk DC3-120 (K210) */
683 case 0x582: /* KittyHawk DC3 100 (K400) */
684 case 0x583: /* KittyHawk DC3 120 (K410) */
685 case 0x58B: /* KittyHawk DC2 100 (K200) */
686 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
687 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
688 goto found; /* use the preinitialized values of lcd_info */
689 }
690
691 /* initialize the struct, so that we can check for valid return values */
692 lcd_info.model = DISPLAY_MODEL_NONE;
693 chassis_info.actcnt = chassis_info.maxcnt = 0;
694
695 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
696 if (ret == PDC_OK) {
697 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
698 "lcd_width=%d, cmd_delay=%u,\n"
699 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
700 __FILE__, lcd_info.model,
701 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
702 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
703 lcd_info.lcd_width, lcd_info.min_cmd_delay,
704 __FILE__, sizeof(lcd_info),
705 chassis_info.actcnt, chassis_info.maxcnt));
706 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
707 __FILE__, lcd_info.lcd_cmd_reg_addr,
708 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
709 lcd_info.reset_cmd2, lcd_info.act_enable ));
710
711 /* check the results. Some machines have a buggy PDC */
712 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
713 goto not_found;
714
715 switch (lcd_info.model) {
716 case DISPLAY_MODEL_LCD: /* LCD display */
717 if (chassis_info.actcnt <
718 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
719 goto not_found;
720 if (!lcd_info.act_enable) {
721 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
722 goto not_found;
723 }
724 break;
725
726 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
727 printk(KERN_INFO "PDC reported no LCD or LED.\n");
728 goto not_found;
729
730 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
731 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
732 goto not_found;
733 break;
734
735 default:
736 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
737 lcd_info.model);
738 goto not_found;
739 } /* switch() */
740
741found:
742 /* register the LCD/LED driver */
743 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
744 return 0;
745
746 } else { /* if() */
747 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
748 }
749
750not_found:
751 lcd_info.model = DISPLAY_MODEL_NONE;
752 return 1;
753}
754
Alan Sterne041c682006-03-27 01:16:30 -0800755static void __exit led_exit(void)
756{
757 unregister_reboot_notifier(&led_notifier);
758 return;
759}
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761#ifdef CONFIG_PROC_FS
762module_init(led_create_procfs)
763#endif