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1da177e4 LT |
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 2001-2004 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> | |
21 | */ | |
22 | ||
23 | #include <linux/config.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/stddef.h> /* for offsetof() */ | |
26 | #include <linux/init.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/ioport.h> | |
29 | #include <linux/utsname.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/inetdevice.h> | |
33 | #include <linux/in.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/kernel_stat.h> | |
36 | #include <linux/reboot.h> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/ctype.h> | |
39 | #include <linux/blkdev.h> | |
e5ed6399 | 40 | #include <linux/rcupdate.h> |
1da177e4 LT |
41 | #include <asm/io.h> |
42 | #include <asm/processor.h> | |
43 | #include <asm/hardware.h> | |
44 | #include <asm/param.h> /* HZ */ | |
45 | #include <asm/led.h> | |
46 | #include <asm/pdc.h> | |
47 | #include <asm/uaccess.h> | |
48 | ||
49 | /* The control of the LEDs and LCDs on PARISC-machines have to be done | |
50 | completely in software. The necessary calculations are done in a tasklet | |
51 | which is scheduled at every timer interrupt and since the calculations | |
52 | may consume relatively much CPU-time some of the calculations can be | |
53 | turned off with the following variables (controlled via procfs) */ | |
54 | ||
55 | static int led_type = -1; | |
56 | static int led_heartbeat = 1; | |
57 | static int led_diskio = 1; | |
58 | static int led_lanrxtx = 1; | |
59 | static char lcd_text[32]; | |
60 | static char lcd_text_default[32]; | |
61 | ||
62 | #if 0 | |
63 | #define DPRINTK(x) printk x | |
64 | #else | |
65 | #define DPRINTK(x) | |
66 | #endif | |
67 | ||
68 | ||
69 | struct lcd_block { | |
70 | unsigned char command; /* stores the command byte */ | |
71 | unsigned char on; /* value for turning LED on */ | |
72 | unsigned char off; /* value for turning LED off */ | |
73 | }; | |
74 | ||
75 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ | |
76 | /* NOTE: we use unsigned long:16 two times, since the following member | |
77 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ | |
78 | struct pdc_chassis_lcd_info_ret_block { | |
79 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ | |
80 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ | |
81 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ | |
82 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ | |
83 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ | |
84 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ | |
85 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ | |
86 | unsigned char act_enable; /* 0 = no activity (LCD only) */ | |
87 | struct lcd_block heartbeat; | |
88 | struct lcd_block disk_io; | |
89 | struct lcd_block lan_rcv; | |
90 | struct lcd_block lan_tx; | |
91 | char _pad; | |
92 | }; | |
93 | ||
94 | ||
95 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ | |
96 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ | |
97 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) | |
98 | ||
99 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's | |
100 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ | |
101 | static struct pdc_chassis_lcd_info_ret_block | |
102 | lcd_info __attribute__((aligned(8))) = | |
103 | { | |
104 | .model = DISPLAY_MODEL_LCD, | |
105 | .lcd_width = 16, | |
106 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, | |
107 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, | |
108 | .min_cmd_delay = 40, | |
109 | .reset_cmd1 = 0x80, | |
110 | .reset_cmd2 = 0xc0, | |
111 | }; | |
112 | ||
113 | ||
114 | /* direct access to some of the lcd_info variables */ | |
115 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr | |
116 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr | |
117 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ | |
118 | ||
119 | ||
120 | /* ptr to LCD/LED-specific function */ | |
121 | static void (*led_func_ptr) (unsigned char); | |
122 | ||
123 | #define LED_HASLCD 1 | |
124 | #define LED_NOLCD 0 | |
125 | #ifdef CONFIG_PROC_FS | |
126 | static int led_proc_read(char *page, char **start, off_t off, int count, | |
127 | int *eof, void *data) | |
128 | { | |
129 | char *out = page; | |
130 | int len; | |
131 | ||
132 | switch ((long)data) | |
133 | { | |
134 | case LED_NOLCD: | |
135 | out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); | |
136 | out += sprintf(out, "Disk IO: %d\n", led_diskio); | |
137 | out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); | |
138 | break; | |
139 | case LED_HASLCD: | |
140 | out += sprintf(out, "%s\n", lcd_text); | |
141 | break; | |
142 | default: | |
143 | *eof = 1; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | len = out - page - off; | |
148 | if (len < count) { | |
149 | *eof = 1; | |
150 | if (len <= 0) return 0; | |
151 | } else { | |
152 | len = count; | |
153 | } | |
154 | *start = page + off; | |
155 | return len; | |
156 | } | |
157 | ||
158 | static int led_proc_write(struct file *file, const char *buf, | |
159 | unsigned long count, void *data) | |
160 | { | |
161 | char *cur, lbuf[count + 1]; | |
162 | int d; | |
163 | ||
164 | if (!capable(CAP_SYS_ADMIN)) | |
165 | return -EACCES; | |
166 | ||
167 | memset(lbuf, 0, count + 1); | |
168 | ||
169 | if (copy_from_user(lbuf, buf, count)) | |
170 | return -EFAULT; | |
171 | ||
172 | cur = lbuf; | |
173 | ||
174 | /* skip initial spaces */ | |
175 | while (*cur && isspace(*cur)) | |
176 | { | |
177 | cur++; | |
178 | } | |
179 | ||
180 | switch ((long)data) | |
181 | { | |
182 | case LED_NOLCD: | |
183 | d = *cur++ - '0'; | |
184 | if (d != 0 && d != 1) goto parse_error; | |
185 | led_heartbeat = d; | |
186 | ||
187 | if (*cur++ != ' ') goto parse_error; | |
188 | ||
189 | d = *cur++ - '0'; | |
190 | if (d != 0 && d != 1) goto parse_error; | |
191 | led_diskio = d; | |
192 | ||
193 | if (*cur++ != ' ') goto parse_error; | |
194 | ||
195 | d = *cur++ - '0'; | |
196 | if (d != 0 && d != 1) goto parse_error; | |
197 | led_lanrxtx = d; | |
198 | ||
199 | break; | |
200 | case LED_HASLCD: | |
201 | if (*cur && cur[strlen(cur)-1] == '\n') | |
202 | cur[strlen(cur)-1] = 0; | |
203 | if (*cur == 0) | |
204 | cur = lcd_text_default; | |
205 | lcd_print(cur); | |
206 | break; | |
207 | default: | |
208 | return 0; | |
209 | } | |
210 | ||
211 | return count; | |
212 | ||
213 | parse_error: | |
214 | if ((long)data == LED_NOLCD) | |
215 | printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | static int __init led_create_procfs(void) | |
220 | { | |
221 | struct proc_dir_entry *proc_pdc_root = NULL; | |
222 | struct proc_dir_entry *ent; | |
223 | ||
224 | if (led_type == -1) return -1; | |
225 | ||
226 | proc_pdc_root = proc_mkdir("pdc", 0); | |
227 | if (!proc_pdc_root) return -1; | |
228 | proc_pdc_root->owner = THIS_MODULE; | |
229 | ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); | |
230 | if (!ent) return -1; | |
231 | ent->nlink = 1; | |
232 | ent->data = (void *)LED_NOLCD; /* LED */ | |
233 | ent->read_proc = led_proc_read; | |
234 | ent->write_proc = led_proc_write; | |
235 | ent->owner = THIS_MODULE; | |
236 | ||
237 | if (led_type == LED_HASLCD) | |
238 | { | |
239 | ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); | |
240 | if (!ent) return -1; | |
241 | ent->nlink = 1; | |
242 | ent->data = (void *)LED_HASLCD; /* LCD */ | |
243 | ent->read_proc = led_proc_read; | |
244 | ent->write_proc = led_proc_write; | |
245 | ent->owner = THIS_MODULE; | |
246 | } | |
247 | ||
248 | return 0; | |
249 | } | |
250 | #endif | |
251 | ||
252 | /* | |
253 | ** | |
254 | ** led_ASP_driver() | |
255 | ** | |
256 | */ | |
257 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ | |
258 | #define LED_STROBE 0x02 /* strobe to clock data */ | |
259 | static void led_ASP_driver(unsigned char leds) | |
260 | { | |
261 | int i; | |
262 | ||
263 | leds = ~leds; | |
264 | for (i = 0; i < 8; i++) { | |
265 | unsigned char value; | |
266 | value = (leds & 0x80) >> 7; | |
267 | gsc_writeb( value, LED_DATA_REG ); | |
268 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); | |
269 | leds <<= 1; | |
270 | } | |
271 | } | |
272 | ||
273 | ||
274 | /* | |
275 | ** | |
276 | ** led_LASI_driver() | |
277 | ** | |
278 | */ | |
279 | static void led_LASI_driver(unsigned char leds) | |
280 | { | |
281 | leds = ~leds; | |
282 | gsc_writeb( leds, LED_DATA_REG ); | |
283 | } | |
284 | ||
285 | ||
286 | /* | |
287 | ** | |
288 | ** led_LCD_driver() | |
289 | ** | |
290 | ** The logic of the LCD driver is, that we write at every scheduled call | |
291 | ** only to one of LCD_CMD_REG _or_ LCD_DATA_REG - registers. | |
292 | ** That way we don't need to let this tasklet busywait for min_cmd_delay | |
293 | ** milliseconds. | |
294 | ** | |
295 | ** TODO: check the value of "min_cmd_delay" against the value of HZ. | |
296 | ** | |
297 | */ | |
298 | static void led_LCD_driver(unsigned char leds) | |
299 | { | |
300 | static int last_index; /* 0:heartbeat, 1:disk, 2:lan_in, 3:lan_out */ | |
301 | static int last_was_cmd;/* 0: CMD was written last, 1: DATA was last */ | |
302 | struct lcd_block *block_ptr; | |
303 | int value; | |
304 | ||
305 | switch (last_index) { | |
306 | case 0: block_ptr = &lcd_info.heartbeat; | |
307 | value = leds & LED_HEARTBEAT; | |
308 | break; | |
309 | case 1: block_ptr = &lcd_info.disk_io; | |
310 | value = leds & LED_DISK_IO; | |
311 | break; | |
312 | case 2: block_ptr = &lcd_info.lan_rcv; | |
313 | value = leds & LED_LAN_RCV; | |
314 | break; | |
315 | case 3: block_ptr = &lcd_info.lan_tx; | |
316 | value = leds & LED_LAN_TX; | |
317 | break; | |
318 | default: /* should never happen: */ | |
319 | return; | |
320 | } | |
321 | ||
322 | if (last_was_cmd) { | |
323 | /* write the value to the LCD data port */ | |
324 | gsc_writeb( value ? block_ptr->on : block_ptr->off, LCD_DATA_REG ); | |
325 | } else { | |
326 | /* write the command-byte to the LCD command register */ | |
327 | gsc_writeb( block_ptr->command, LCD_CMD_REG ); | |
328 | } | |
329 | ||
330 | /* now update the vars for the next interrupt iteration */ | |
331 | if (++last_was_cmd == 2) { /* switch between cmd & data */ | |
332 | last_was_cmd = 0; | |
333 | if (++last_index == 4) | |
334 | last_index = 0; /* switch back to heartbeat index */ | |
335 | } | |
336 | } | |
337 | ||
338 | ||
339 | /* | |
340 | ** | |
341 | ** led_get_net_activity() | |
342 | ** | |
343 | ** calculate if there was TX- or RX-troughput on the network interfaces | |
344 | ** (analog to dev_get_info() from net/core/dev.c) | |
345 | ** | |
346 | */ | |
347 | static __inline__ int led_get_net_activity(void) | |
348 | { | |
349 | #ifndef CONFIG_NET | |
350 | return 0; | |
351 | #else | |
352 | static unsigned long rx_total_last, tx_total_last; | |
353 | unsigned long rx_total, tx_total; | |
354 | struct net_device *dev; | |
355 | int retval; | |
356 | ||
357 | rx_total = tx_total = 0; | |
358 | ||
359 | /* we are running as tasklet, so locking dev_base | |
360 | * for reading should be OK */ | |
361 | read_lock(&dev_base_lock); | |
e5ed6399 | 362 | rcu_read_lock(); |
1da177e4 LT |
363 | for (dev = dev_base; dev; dev = dev->next) { |
364 | struct net_device_stats *stats; | |
e5ed6399 | 365 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
366 | if (!in_dev || !in_dev->ifa_list) |
367 | continue; | |
368 | if (LOOPBACK(in_dev->ifa_list->ifa_local)) | |
369 | continue; | |
370 | if (!dev->get_stats) | |
371 | continue; | |
372 | stats = dev->get_stats(dev); | |
373 | rx_total += stats->rx_packets; | |
374 | tx_total += stats->tx_packets; | |
375 | } | |
e5ed6399 | 376 | rcu_read_unlock(); |
1da177e4 LT |
377 | read_unlock(&dev_base_lock); |
378 | ||
379 | retval = 0; | |
380 | ||
381 | if (rx_total != rx_total_last) { | |
382 | rx_total_last = rx_total; | |
383 | retval |= LED_LAN_RCV; | |
384 | } | |
385 | ||
386 | if (tx_total != tx_total_last) { | |
387 | tx_total_last = tx_total; | |
388 | retval |= LED_LAN_TX; | |
389 | } | |
390 | ||
391 | return retval; | |
392 | #endif | |
393 | } | |
394 | ||
395 | ||
396 | /* | |
397 | ** | |
398 | ** led_get_diskio_activity() | |
399 | ** | |
400 | ** calculate if there was disk-io in the system | |
401 | ** | |
402 | */ | |
403 | static __inline__ int led_get_diskio_activity(void) | |
404 | { | |
405 | static unsigned long last_pgpgin, last_pgpgout; | |
406 | struct page_state pgstat; | |
407 | int changed; | |
408 | ||
409 | get_full_page_state(&pgstat); /* get no of sectors in & out */ | |
410 | ||
411 | /* Just use a very simple calculation here. Do not care about overflow, | |
412 | since we only want to know if there was activity or not. */ | |
413 | changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout); | |
414 | last_pgpgin = pgstat.pgpgin; | |
415 | last_pgpgout = pgstat.pgpgout; | |
416 | ||
417 | return (changed ? LED_DISK_IO : 0); | |
418 | } | |
419 | ||
420 | ||
421 | ||
422 | /* | |
423 | ** led_tasklet_func() | |
424 | ** | |
425 | ** is scheduled at every timer interrupt from time.c and | |
426 | ** updates the chassis LCD/LED | |
427 | ||
428 | TODO: | |
429 | - display load average (older machines like 715/64 have 4 "free" LED's for that) | |
430 | - optimizations | |
431 | */ | |
432 | ||
433 | #define HEARTBEAT_LEN (HZ*6/100) | |
434 | #define HEARTBEAT_2ND_RANGE_START (HZ*22/100) | |
435 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) | |
436 | ||
437 | #define NORMALIZED_COUNT(count) (count/(HZ/100)) | |
438 | ||
439 | static void led_tasklet_func(unsigned long unused) | |
440 | { | |
441 | static unsigned char lastleds; | |
442 | unsigned char currentleds; /* stores current value of the LEDs */ | |
443 | static unsigned long count; /* static incremented value, not wrapped */ | |
444 | static unsigned long count_HZ; /* counter in range 0..HZ */ | |
445 | ||
446 | /* exit if not initialized */ | |
447 | if (!led_func_ptr) | |
448 | return; | |
449 | ||
450 | /* increment the local counters */ | |
451 | ++count; | |
452 | if (++count_HZ == HZ) | |
453 | count_HZ = 0; | |
454 | ||
455 | currentleds = lastleds; | |
456 | ||
457 | if (led_heartbeat) | |
458 | { | |
459 | /* flash heartbeat-LED like a real heart (2 x short then a long delay) */ | |
460 | if (count_HZ<HEARTBEAT_LEN || | |
461 | (count_HZ>=HEARTBEAT_2ND_RANGE_START && count_HZ<HEARTBEAT_2ND_RANGE_END)) | |
462 | currentleds |= LED_HEARTBEAT; | |
463 | else | |
464 | currentleds &= ~LED_HEARTBEAT; | |
465 | } | |
466 | ||
467 | /* look for network activity and flash LEDs respectively */ | |
468 | if (led_lanrxtx && ((NORMALIZED_COUNT(count)+(8/2)) & 7) == 0) | |
469 | { | |
470 | currentleds &= ~(LED_LAN_RCV | LED_LAN_TX); | |
471 | currentleds |= led_get_net_activity(); | |
472 | } | |
473 | ||
474 | /* avoid to calculate diskio-stats at same irq as netio-stats */ | |
475 | if (led_diskio && (NORMALIZED_COUNT(count) & 7) == 0) | |
476 | { | |
477 | currentleds &= ~LED_DISK_IO; | |
478 | currentleds |= led_get_diskio_activity(); | |
479 | } | |
480 | ||
481 | /* blink all LEDs twice a second if we got an Oops (HPMC) */ | |
482 | if (oops_in_progress) { | |
483 | currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; | |
484 | } | |
485 | ||
486 | /* update the LCD/LEDs */ | |
487 | if (currentleds != lastleds) { | |
488 | led_func_ptr(currentleds); | |
489 | lastleds = currentleds; | |
490 | } | |
491 | } | |
492 | ||
493 | /* main led tasklet struct (scheduled from time.c) */ | |
494 | DECLARE_TASKLET_DISABLED(led_tasklet, led_tasklet_func, 0); | |
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 | ||
511 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) | |
512 | { | |
513 | char *txt; | |
514 | ||
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 | /* completely stop the LED/LCD tasklet */ | |
526 | tasklet_disable(&led_tasklet); | |
527 | ||
528 | if (lcd_info.model == DISPLAY_MODEL_LCD) | |
529 | lcd_print(txt); | |
530 | else | |
531 | if (led_func_ptr) | |
532 | led_func_ptr(0xff); /* turn all LEDs ON */ | |
533 | ||
534 | unregister_reboot_notifier(&led_notifier); | |
535 | return NOTIFY_OK; | |
536 | } | |
537 | ||
538 | /* | |
539 | ** register_led_driver() | |
540 | ** | |
541 | ** registers an external LED or LCD for usage by this driver. | |
542 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. | |
543 | ** | |
544 | */ | |
545 | ||
546 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) | |
547 | { | |
548 | static int initialized; | |
549 | ||
550 | if (initialized || !data_reg) | |
551 | return 1; | |
552 | ||
553 | lcd_info.model = model; /* store the values */ | |
554 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; | |
555 | ||
556 | switch (lcd_info.model) { | |
557 | case DISPLAY_MODEL_LCD: | |
558 | LCD_DATA_REG = data_reg; | |
559 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", | |
560 | LCD_CMD_REG , LCD_DATA_REG); | |
561 | led_func_ptr = led_LCD_driver; | |
562 | lcd_print( lcd_text_default ); | |
563 | led_type = LED_HASLCD; | |
564 | break; | |
565 | ||
566 | case DISPLAY_MODEL_LASI: | |
567 | LED_DATA_REG = data_reg; | |
568 | led_func_ptr = led_LASI_driver; | |
569 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); | |
570 | led_type = LED_NOLCD; | |
571 | break; | |
572 | ||
573 | case DISPLAY_MODEL_OLD_ASP: | |
574 | LED_DATA_REG = data_reg; | |
575 | led_func_ptr = led_ASP_driver; | |
576 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", | |
577 | LED_DATA_REG); | |
578 | led_type = LED_NOLCD; | |
579 | break; | |
580 | ||
581 | default: | |
582 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", | |
583 | __FUNCTION__, lcd_info.model); | |
584 | return 1; | |
585 | } | |
586 | ||
587 | /* mark the LCD/LED driver now as initialized and | |
588 | * register to the reboot notifier chain */ | |
589 | initialized++; | |
590 | register_reboot_notifier(&led_notifier); | |
591 | ||
592 | /* start the led tasklet for the first time */ | |
593 | tasklet_enable(&led_tasklet); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | /* | |
599 | ** register_led_regions() | |
600 | ** | |
601 | ** register_led_regions() registers the LCD/LED regions for /procfs. | |
602 | ** At bootup - where the initialisation of the LCD/LED normally happens - | |
603 | ** not all internal structures of request_region() are properly set up, | |
604 | ** so that we delay the led-registration until after busdevices_init() | |
605 | ** has been executed. | |
606 | ** | |
607 | */ | |
608 | ||
609 | void __init register_led_regions(void) | |
610 | { | |
611 | switch (lcd_info.model) { | |
612 | case DISPLAY_MODEL_LCD: | |
613 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); | |
614 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); | |
615 | break; | |
616 | case DISPLAY_MODEL_LASI: | |
617 | case DISPLAY_MODEL_OLD_ASP: | |
618 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); | |
619 | break; | |
620 | } | |
621 | } | |
622 | ||
623 | ||
624 | /* | |
625 | ** | |
626 | ** lcd_print() | |
627 | ** | |
628 | ** Displays the given string on the LCD-Display of newer machines. | |
629 | ** lcd_print() disables the timer-based led tasklet during its | |
630 | ** execution and enables it afterwards again. | |
631 | ** | |
632 | */ | |
633 | int lcd_print( char *str ) | |
634 | { | |
635 | int i; | |
636 | ||
637 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) | |
638 | return 0; | |
639 | ||
640 | /* temporarily disable the led tasklet */ | |
641 | tasklet_disable(&led_tasklet); | |
642 | ||
643 | /* copy display string to buffer for procfs */ | |
644 | strlcpy(lcd_text, str, sizeof(lcd_text)); | |
645 | ||
646 | /* Set LCD Cursor to 1st character */ | |
647 | gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); | |
648 | udelay(lcd_info.min_cmd_delay); | |
649 | ||
650 | /* Print the string */ | |
651 | for (i=0; i < lcd_info.lcd_width; i++) { | |
652 | if (str && *str) | |
653 | gsc_writeb(*str++, LCD_DATA_REG); | |
654 | else | |
655 | gsc_writeb(' ', LCD_DATA_REG); | |
656 | udelay(lcd_info.min_cmd_delay); | |
657 | } | |
658 | ||
659 | /* re-enable the led tasklet */ | |
660 | tasklet_enable(&led_tasklet); | |
661 | ||
662 | return lcd_info.lcd_width; | |
663 | } | |
664 | ||
665 | /* | |
666 | ** led_init() | |
667 | ** | |
668 | ** led_init() is called very early in the bootup-process from setup.c | |
669 | ** and asks the PDC for an usable chassis LCD or LED. | |
670 | ** If the PDC doesn't return any info, then the LED | |
671 | ** is detected by lasi.c or asp.c and registered with the | |
672 | ** above functions lasi_led_init() or asp_led_init(). | |
673 | ** KittyHawk machines have often a buggy PDC, so that | |
674 | ** we explicitly check for those machines here. | |
675 | */ | |
676 | ||
677 | int __init led_init(void) | |
678 | { | |
679 | struct pdc_chassis_info chassis_info; | |
680 | int ret; | |
681 | ||
682 | snprintf(lcd_text_default, sizeof(lcd_text_default), | |
683 | "Linux %s", system_utsname.release); | |
684 | ||
685 | /* Work around the buggy PDC of KittyHawk-machines */ | |
686 | switch (CPU_HVERSION) { | |
687 | case 0x580: /* KittyHawk DC2-100 (K100) */ | |
688 | case 0x581: /* KittyHawk DC3-120 (K210) */ | |
689 | case 0x582: /* KittyHawk DC3 100 (K400) */ | |
690 | case 0x583: /* KittyHawk DC3 120 (K410) */ | |
691 | case 0x58B: /* KittyHawk DC2 100 (K200) */ | |
692 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " | |
693 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); | |
694 | goto found; /* use the preinitialized values of lcd_info */ | |
695 | } | |
696 | ||
697 | /* initialize the struct, so that we can check for valid return values */ | |
698 | lcd_info.model = DISPLAY_MODEL_NONE; | |
699 | chassis_info.actcnt = chassis_info.maxcnt = 0; | |
700 | ||
701 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); | |
702 | if (ret == PDC_OK) { | |
703 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " | |
704 | "lcd_width=%d, cmd_delay=%u,\n" | |
705 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", | |
706 | __FILE__, lcd_info.model, | |
707 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : | |
708 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", | |
709 | lcd_info.lcd_width, lcd_info.min_cmd_delay, | |
710 | __FILE__, sizeof(lcd_info), | |
711 | chassis_info.actcnt, chassis_info.maxcnt)); | |
712 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", | |
713 | __FILE__, lcd_info.lcd_cmd_reg_addr, | |
714 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, | |
715 | lcd_info.reset_cmd2, lcd_info.act_enable )); | |
716 | ||
717 | /* check the results. Some machines have a buggy PDC */ | |
718 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) | |
719 | goto not_found; | |
720 | ||
721 | switch (lcd_info.model) { | |
722 | case DISPLAY_MODEL_LCD: /* LCD display */ | |
723 | if (chassis_info.actcnt < | |
724 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) | |
725 | goto not_found; | |
726 | if (!lcd_info.act_enable) { | |
727 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); | |
728 | goto not_found; | |
729 | } | |
730 | break; | |
731 | ||
732 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ | |
733 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); | |
734 | goto not_found; | |
735 | ||
736 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ | |
737 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) | |
738 | goto not_found; | |
739 | break; | |
740 | ||
741 | default: | |
742 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", | |
743 | lcd_info.model); | |
744 | goto not_found; | |
745 | } /* switch() */ | |
746 | ||
747 | found: | |
748 | /* register the LCD/LED driver */ | |
749 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); | |
750 | return 0; | |
751 | ||
752 | } else { /* if() */ | |
753 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); | |
754 | } | |
755 | ||
756 | not_found: | |
757 | lcd_info.model = DISPLAY_MODEL_NONE; | |
758 | return 1; | |
759 | } | |
760 | ||
761 | #ifdef CONFIG_PROC_FS | |
762 | module_init(led_create_procfs) | |
763 | #endif |