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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> | |
40 | #include <asm/io.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/hardware.h> | |
43 | #include <asm/param.h> /* HZ */ | |
44 | #include <asm/led.h> | |
45 | #include <asm/pdc.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
48 | /* The control of the LEDs and LCDs on PARISC-machines have to be done | |
49 | completely in software. The necessary calculations are done in a tasklet | |
50 | which is scheduled at every timer interrupt and since the calculations | |
51 | may consume relatively much CPU-time some of the calculations can be | |
52 | turned off with the following variables (controlled via procfs) */ | |
53 | ||
54 | static int led_type = -1; | |
55 | static int led_heartbeat = 1; | |
56 | static int led_diskio = 1; | |
57 | static int led_lanrxtx = 1; | |
58 | static char lcd_text[32]; | |
59 | static char lcd_text_default[32]; | |
60 | ||
61 | #if 0 | |
62 | #define DPRINTK(x) printk x | |
63 | #else | |
64 | #define DPRINTK(x) | |
65 | #endif | |
66 | ||
67 | ||
68 | struct lcd_block { | |
69 | unsigned char command; /* stores the command byte */ | |
70 | unsigned char on; /* value for turning LED on */ | |
71 | unsigned char off; /* value for turning LED off */ | |
72 | }; | |
73 | ||
74 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ | |
75 | /* NOTE: we use unsigned long:16 two times, since the following member | |
76 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ | |
77 | struct pdc_chassis_lcd_info_ret_block { | |
78 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ | |
79 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ | |
80 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ | |
81 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ | |
82 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ | |
83 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ | |
84 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ | |
85 | unsigned char act_enable; /* 0 = no activity (LCD only) */ | |
86 | struct lcd_block heartbeat; | |
87 | struct lcd_block disk_io; | |
88 | struct lcd_block lan_rcv; | |
89 | struct lcd_block lan_tx; | |
90 | char _pad; | |
91 | }; | |
92 | ||
93 | ||
94 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ | |
95 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ | |
96 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) | |
97 | ||
98 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's | |
99 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ | |
100 | static struct pdc_chassis_lcd_info_ret_block | |
101 | lcd_info __attribute__((aligned(8))) = | |
102 | { | |
103 | .model = DISPLAY_MODEL_LCD, | |
104 | .lcd_width = 16, | |
105 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, | |
106 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, | |
107 | .min_cmd_delay = 40, | |
108 | .reset_cmd1 = 0x80, | |
109 | .reset_cmd2 = 0xc0, | |
110 | }; | |
111 | ||
112 | ||
113 | /* direct access to some of the lcd_info variables */ | |
114 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr | |
115 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr | |
116 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ | |
117 | ||
118 | ||
119 | /* ptr to LCD/LED-specific function */ | |
120 | static void (*led_func_ptr) (unsigned char); | |
121 | ||
122 | #define LED_HASLCD 1 | |
123 | #define LED_NOLCD 0 | |
124 | #ifdef CONFIG_PROC_FS | |
125 | static int led_proc_read(char *page, char **start, off_t off, int count, | |
126 | int *eof, void *data) | |
127 | { | |
128 | char *out = page; | |
129 | int len; | |
130 | ||
131 | switch ((long)data) | |
132 | { | |
133 | case LED_NOLCD: | |
134 | out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); | |
135 | out += sprintf(out, "Disk IO: %d\n", led_diskio); | |
136 | out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); | |
137 | break; | |
138 | case LED_HASLCD: | |
139 | out += sprintf(out, "%s\n", lcd_text); | |
140 | break; | |
141 | default: | |
142 | *eof = 1; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | len = out - page - off; | |
147 | if (len < count) { | |
148 | *eof = 1; | |
149 | if (len <= 0) return 0; | |
150 | } else { | |
151 | len = count; | |
152 | } | |
153 | *start = page + off; | |
154 | return len; | |
155 | } | |
156 | ||
157 | static int led_proc_write(struct file *file, const char *buf, | |
158 | unsigned long count, void *data) | |
159 | { | |
160 | char *cur, lbuf[count + 1]; | |
161 | int d; | |
162 | ||
163 | if (!capable(CAP_SYS_ADMIN)) | |
164 | return -EACCES; | |
165 | ||
166 | memset(lbuf, 0, count + 1); | |
167 | ||
168 | if (copy_from_user(lbuf, buf, count)) | |
169 | return -EFAULT; | |
170 | ||
171 | cur = lbuf; | |
172 | ||
173 | /* skip initial spaces */ | |
174 | while (*cur && isspace(*cur)) | |
175 | { | |
176 | cur++; | |
177 | } | |
178 | ||
179 | switch ((long)data) | |
180 | { | |
181 | case LED_NOLCD: | |
182 | d = *cur++ - '0'; | |
183 | if (d != 0 && d != 1) goto parse_error; | |
184 | led_heartbeat = d; | |
185 | ||
186 | if (*cur++ != ' ') goto parse_error; | |
187 | ||
188 | d = *cur++ - '0'; | |
189 | if (d != 0 && d != 1) goto parse_error; | |
190 | led_diskio = d; | |
191 | ||
192 | if (*cur++ != ' ') goto parse_error; | |
193 | ||
194 | d = *cur++ - '0'; | |
195 | if (d != 0 && d != 1) goto parse_error; | |
196 | led_lanrxtx = d; | |
197 | ||
198 | break; | |
199 | case LED_HASLCD: | |
200 | if (*cur && cur[strlen(cur)-1] == '\n') | |
201 | cur[strlen(cur)-1] = 0; | |
202 | if (*cur == 0) | |
203 | cur = lcd_text_default; | |
204 | lcd_print(cur); | |
205 | break; | |
206 | default: | |
207 | return 0; | |
208 | } | |
209 | ||
210 | return count; | |
211 | ||
212 | parse_error: | |
213 | if ((long)data == LED_NOLCD) | |
214 | printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | static int __init led_create_procfs(void) | |
219 | { | |
220 | struct proc_dir_entry *proc_pdc_root = NULL; | |
221 | struct proc_dir_entry *ent; | |
222 | ||
223 | if (led_type == -1) return -1; | |
224 | ||
225 | proc_pdc_root = proc_mkdir("pdc", 0); | |
226 | if (!proc_pdc_root) return -1; | |
227 | proc_pdc_root->owner = THIS_MODULE; | |
228 | ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); | |
229 | if (!ent) return -1; | |
230 | ent->nlink = 1; | |
231 | ent->data = (void *)LED_NOLCD; /* LED */ | |
232 | ent->read_proc = led_proc_read; | |
233 | ent->write_proc = led_proc_write; | |
234 | ent->owner = THIS_MODULE; | |
235 | ||
236 | if (led_type == LED_HASLCD) | |
237 | { | |
238 | ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); | |
239 | if (!ent) return -1; | |
240 | ent->nlink = 1; | |
241 | ent->data = (void *)LED_HASLCD; /* LCD */ | |
242 | ent->read_proc = led_proc_read; | |
243 | ent->write_proc = led_proc_write; | |
244 | ent->owner = THIS_MODULE; | |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | #endif | |
250 | ||
251 | /* | |
252 | ** | |
253 | ** led_ASP_driver() | |
254 | ** | |
255 | */ | |
256 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ | |
257 | #define LED_STROBE 0x02 /* strobe to clock data */ | |
258 | static void led_ASP_driver(unsigned char leds) | |
259 | { | |
260 | int i; | |
261 | ||
262 | leds = ~leds; | |
263 | for (i = 0; i < 8; i++) { | |
264 | unsigned char value; | |
265 | value = (leds & 0x80) >> 7; | |
266 | gsc_writeb( value, LED_DATA_REG ); | |
267 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); | |
268 | leds <<= 1; | |
269 | } | |
270 | } | |
271 | ||
272 | ||
273 | /* | |
274 | ** | |
275 | ** led_LASI_driver() | |
276 | ** | |
277 | */ | |
278 | static void led_LASI_driver(unsigned char leds) | |
279 | { | |
280 | leds = ~leds; | |
281 | gsc_writeb( leds, LED_DATA_REG ); | |
282 | } | |
283 | ||
284 | ||
285 | /* | |
286 | ** | |
287 | ** led_LCD_driver() | |
288 | ** | |
289 | ** The logic of the LCD driver is, that we write at every scheduled call | |
290 | ** only to one of LCD_CMD_REG _or_ LCD_DATA_REG - registers. | |
291 | ** That way we don't need to let this tasklet busywait for min_cmd_delay | |
292 | ** milliseconds. | |
293 | ** | |
294 | ** TODO: check the value of "min_cmd_delay" against the value of HZ. | |
295 | ** | |
296 | */ | |
297 | static void led_LCD_driver(unsigned char leds) | |
298 | { | |
299 | static int last_index; /* 0:heartbeat, 1:disk, 2:lan_in, 3:lan_out */ | |
300 | static int last_was_cmd;/* 0: CMD was written last, 1: DATA was last */ | |
301 | struct lcd_block *block_ptr; | |
302 | int value; | |
303 | ||
304 | switch (last_index) { | |
305 | case 0: block_ptr = &lcd_info.heartbeat; | |
306 | value = leds & LED_HEARTBEAT; | |
307 | break; | |
308 | case 1: block_ptr = &lcd_info.disk_io; | |
309 | value = leds & LED_DISK_IO; | |
310 | break; | |
311 | case 2: block_ptr = &lcd_info.lan_rcv; | |
312 | value = leds & LED_LAN_RCV; | |
313 | break; | |
314 | case 3: block_ptr = &lcd_info.lan_tx; | |
315 | value = leds & LED_LAN_TX; | |
316 | break; | |
317 | default: /* should never happen: */ | |
318 | return; | |
319 | } | |
320 | ||
321 | if (last_was_cmd) { | |
322 | /* write the value to the LCD data port */ | |
323 | gsc_writeb( value ? block_ptr->on : block_ptr->off, LCD_DATA_REG ); | |
324 | } else { | |
325 | /* write the command-byte to the LCD command register */ | |
326 | gsc_writeb( block_ptr->command, LCD_CMD_REG ); | |
327 | } | |
328 | ||
329 | /* now update the vars for the next interrupt iteration */ | |
330 | if (++last_was_cmd == 2) { /* switch between cmd & data */ | |
331 | last_was_cmd = 0; | |
332 | if (++last_index == 4) | |
333 | last_index = 0; /* switch back to heartbeat index */ | |
334 | } | |
335 | } | |
336 | ||
337 | ||
338 | /* | |
339 | ** | |
340 | ** led_get_net_activity() | |
341 | ** | |
342 | ** calculate if there was TX- or RX-troughput on the network interfaces | |
343 | ** (analog to dev_get_info() from net/core/dev.c) | |
344 | ** | |
345 | */ | |
346 | static __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 | ||
358 | /* we are running as tasklet, so locking dev_base | |
359 | * for reading should be OK */ | |
360 | read_lock(&dev_base_lock); | |
361 | for (dev = dev_base; dev; dev = dev->next) { | |
362 | struct net_device_stats *stats; | |
363 | struct in_device *in_dev = __in_dev_get(dev); | |
364 | if (!in_dev || !in_dev->ifa_list) | |
365 | continue; | |
366 | if (LOOPBACK(in_dev->ifa_list->ifa_local)) | |
367 | continue; | |
368 | if (!dev->get_stats) | |
369 | continue; | |
370 | stats = dev->get_stats(dev); | |
371 | rx_total += stats->rx_packets; | |
372 | tx_total += stats->tx_packets; | |
373 | } | |
374 | 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 | */ | |
400 | static __inline__ int led_get_diskio_activity(void) | |
401 | { | |
402 | static unsigned long last_pgpgin, last_pgpgout; | |
403 | struct page_state pgstat; | |
404 | int changed; | |
405 | ||
406 | get_full_page_state(&pgstat); /* get no of sectors in & out */ | |
407 | ||
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. */ | |
410 | changed = (pgstat.pgpgin != last_pgpgin) || (pgstat.pgpgout != last_pgpgout); | |
411 | last_pgpgin = pgstat.pgpgin; | |
412 | last_pgpgout = pgstat.pgpgout; | |
413 | ||
414 | return (changed ? LED_DISK_IO : 0); | |
415 | } | |
416 | ||
417 | ||
418 | ||
419 | /* | |
420 | ** led_tasklet_func() | |
421 | ** | |
422 | ** is scheduled at every timer interrupt from time.c and | |
423 | ** updates the chassis LCD/LED | |
424 | ||
425 | TODO: | |
426 | - display load average (older machines like 715/64 have 4 "free" LED's for that) | |
427 | - optimizations | |
428 | */ | |
429 | ||
430 | #define HEARTBEAT_LEN (HZ*6/100) | |
431 | #define HEARTBEAT_2ND_RANGE_START (HZ*22/100) | |
432 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) | |
433 | ||
434 | #define NORMALIZED_COUNT(count) (count/(HZ/100)) | |
435 | ||
436 | static void led_tasklet_func(unsigned long unused) | |
437 | { | |
438 | static unsigned char lastleds; | |
439 | unsigned char currentleds; /* stores current value of the LEDs */ | |
440 | static unsigned long count; /* static incremented value, not wrapped */ | |
441 | static unsigned long count_HZ; /* counter in range 0..HZ */ | |
442 | ||
443 | /* exit if not initialized */ | |
444 | if (!led_func_ptr) | |
445 | return; | |
446 | ||
447 | /* increment the local counters */ | |
448 | ++count; | |
449 | if (++count_HZ == HZ) | |
450 | count_HZ = 0; | |
451 | ||
452 | currentleds = lastleds; | |
453 | ||
454 | if (led_heartbeat) | |
455 | { | |
456 | /* flash heartbeat-LED like a real heart (2 x short then a long delay) */ | |
457 | if (count_HZ<HEARTBEAT_LEN || | |
458 | (count_HZ>=HEARTBEAT_2ND_RANGE_START && count_HZ<HEARTBEAT_2ND_RANGE_END)) | |
459 | currentleds |= LED_HEARTBEAT; | |
460 | else | |
461 | currentleds &= ~LED_HEARTBEAT; | |
462 | } | |
463 | ||
464 | /* look for network activity and flash LEDs respectively */ | |
465 | if (led_lanrxtx && ((NORMALIZED_COUNT(count)+(8/2)) & 7) == 0) | |
466 | { | |
467 | currentleds &= ~(LED_LAN_RCV | LED_LAN_TX); | |
468 | currentleds |= led_get_net_activity(); | |
469 | } | |
470 | ||
471 | /* avoid to calculate diskio-stats at same irq as netio-stats */ | |
472 | if (led_diskio && (NORMALIZED_COUNT(count) & 7) == 0) | |
473 | { | |
474 | currentleds &= ~LED_DISK_IO; | |
475 | currentleds |= led_get_diskio_activity(); | |
476 | } | |
477 | ||
478 | /* blink all LEDs twice a second if we got an Oops (HPMC) */ | |
479 | if (oops_in_progress) { | |
480 | currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff; | |
481 | } | |
482 | ||
483 | /* update the LCD/LEDs */ | |
484 | if (currentleds != lastleds) { | |
485 | led_func_ptr(currentleds); | |
486 | lastleds = currentleds; | |
487 | } | |
488 | } | |
489 | ||
490 | /* main led tasklet struct (scheduled from time.c) */ | |
491 | DECLARE_TASKLET_DISABLED(led_tasklet, led_tasklet_func, 0); | |
492 | ||
493 | ||
494 | /* | |
495 | ** led_halt() | |
496 | ** | |
497 | ** called by the reboot notifier chain at shutdown and stops all | |
498 | ** LED/LCD activities. | |
499 | ** | |
500 | */ | |
501 | ||
502 | static int led_halt(struct notifier_block *, unsigned long, void *); | |
503 | ||
504 | static struct notifier_block led_notifier = { | |
505 | .notifier_call = led_halt, | |
506 | }; | |
507 | ||
508 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) | |
509 | { | |
510 | char *txt; | |
511 | ||
512 | switch (event) { | |
513 | case SYS_RESTART: txt = "SYSTEM RESTART"; | |
514 | break; | |
515 | case SYS_HALT: txt = "SYSTEM HALT"; | |
516 | break; | |
517 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; | |
518 | break; | |
519 | default: return NOTIFY_DONE; | |
520 | } | |
521 | ||
522 | /* completely stop the LED/LCD tasklet */ | |
523 | tasklet_disable(&led_tasklet); | |
524 | ||
525 | if (lcd_info.model == DISPLAY_MODEL_LCD) | |
526 | lcd_print(txt); | |
527 | else | |
528 | if (led_func_ptr) | |
529 | led_func_ptr(0xff); /* turn all LEDs ON */ | |
530 | ||
531 | unregister_reboot_notifier(&led_notifier); | |
532 | return NOTIFY_OK; | |
533 | } | |
534 | ||
535 | /* | |
536 | ** register_led_driver() | |
537 | ** | |
538 | ** registers an external LED or LCD for usage by this driver. | |
539 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. | |
540 | ** | |
541 | */ | |
542 | ||
543 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) | |
544 | { | |
545 | static int initialized; | |
546 | ||
547 | if (initialized || !data_reg) | |
548 | return 1; | |
549 | ||
550 | lcd_info.model = model; /* store the values */ | |
551 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; | |
552 | ||
553 | switch (lcd_info.model) { | |
554 | case DISPLAY_MODEL_LCD: | |
555 | LCD_DATA_REG = data_reg; | |
556 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", | |
557 | LCD_CMD_REG , LCD_DATA_REG); | |
558 | led_func_ptr = led_LCD_driver; | |
559 | lcd_print( lcd_text_default ); | |
560 | led_type = LED_HASLCD; | |
561 | break; | |
562 | ||
563 | case DISPLAY_MODEL_LASI: | |
564 | LED_DATA_REG = data_reg; | |
565 | led_func_ptr = led_LASI_driver; | |
566 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); | |
567 | led_type = LED_NOLCD; | |
568 | break; | |
569 | ||
570 | case DISPLAY_MODEL_OLD_ASP: | |
571 | LED_DATA_REG = data_reg; | |
572 | led_func_ptr = led_ASP_driver; | |
573 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", | |
574 | LED_DATA_REG); | |
575 | led_type = LED_NOLCD; | |
576 | break; | |
577 | ||
578 | default: | |
579 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", | |
580 | __FUNCTION__, lcd_info.model); | |
581 | return 1; | |
582 | } | |
583 | ||
584 | /* mark the LCD/LED driver now as initialized and | |
585 | * register to the reboot notifier chain */ | |
586 | initialized++; | |
587 | register_reboot_notifier(&led_notifier); | |
588 | ||
589 | /* start the led tasklet for the first time */ | |
590 | tasklet_enable(&led_tasklet); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /* | |
596 | ** register_led_regions() | |
597 | ** | |
598 | ** register_led_regions() registers the LCD/LED regions for /procfs. | |
599 | ** At bootup - where the initialisation of the LCD/LED normally happens - | |
600 | ** not all internal structures of request_region() are properly set up, | |
601 | ** so that we delay the led-registration until after busdevices_init() | |
602 | ** has been executed. | |
603 | ** | |
604 | */ | |
605 | ||
606 | void __init register_led_regions(void) | |
607 | { | |
608 | switch (lcd_info.model) { | |
609 | case DISPLAY_MODEL_LCD: | |
610 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); | |
611 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); | |
612 | break; | |
613 | case DISPLAY_MODEL_LASI: | |
614 | case DISPLAY_MODEL_OLD_ASP: | |
615 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); | |
616 | break; | |
617 | } | |
618 | } | |
619 | ||
620 | ||
621 | /* | |
622 | ** | |
623 | ** lcd_print() | |
624 | ** | |
625 | ** Displays the given string on the LCD-Display of newer machines. | |
626 | ** lcd_print() disables the timer-based led tasklet during its | |
627 | ** execution and enables it afterwards again. | |
628 | ** | |
629 | */ | |
630 | int lcd_print( char *str ) | |
631 | { | |
632 | int i; | |
633 | ||
634 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) | |
635 | return 0; | |
636 | ||
637 | /* temporarily disable the led tasklet */ | |
638 | tasklet_disable(&led_tasklet); | |
639 | ||
640 | /* copy display string to buffer for procfs */ | |
641 | strlcpy(lcd_text, str, sizeof(lcd_text)); | |
642 | ||
643 | /* 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 | ||
656 | /* re-enable the led tasklet */ | |
657 | tasklet_enable(&led_tasklet); | |
658 | ||
659 | return lcd_info.lcd_width; | |
660 | } | |
661 | ||
662 | /* | |
663 | ** led_init() | |
664 | ** | |
665 | ** led_init() is called very early in the bootup-process from setup.c | |
666 | ** and asks the PDC for an usable chassis LCD or LED. | |
667 | ** If the PDC doesn't return any info, then the LED | |
668 | ** is detected by lasi.c or asp.c and registered with the | |
669 | ** above functions lasi_led_init() or asp_led_init(). | |
670 | ** KittyHawk machines have often a buggy PDC, so that | |
671 | ** we explicitly check for those machines here. | |
672 | */ | |
673 | ||
674 | int __init led_init(void) | |
675 | { | |
676 | struct pdc_chassis_info chassis_info; | |
677 | int ret; | |
678 | ||
679 | snprintf(lcd_text_default, sizeof(lcd_text_default), | |
680 | "Linux %s", system_utsname.release); | |
681 | ||
682 | /* Work around the buggy PDC of KittyHawk-machines */ | |
683 | switch (CPU_HVERSION) { | |
684 | case 0x580: /* KittyHawk DC2-100 (K100) */ | |
685 | case 0x581: /* KittyHawk DC3-120 (K210) */ | |
686 | case 0x582: /* KittyHawk DC3 100 (K400) */ | |
687 | case 0x583: /* KittyHawk DC3 120 (K410) */ | |
688 | case 0x58B: /* KittyHawk DC2 100 (K200) */ | |
689 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " | |
690 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); | |
691 | goto found; /* use the preinitialized values of lcd_info */ | |
692 | } | |
693 | ||
694 | /* initialize the struct, so that we can check for valid return values */ | |
695 | lcd_info.model = DISPLAY_MODEL_NONE; | |
696 | chassis_info.actcnt = chassis_info.maxcnt = 0; | |
697 | ||
698 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); | |
699 | if (ret == PDC_OK) { | |
700 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " | |
701 | "lcd_width=%d, cmd_delay=%u,\n" | |
702 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", | |
703 | __FILE__, lcd_info.model, | |
704 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : | |
705 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", | |
706 | lcd_info.lcd_width, lcd_info.min_cmd_delay, | |
707 | __FILE__, sizeof(lcd_info), | |
708 | chassis_info.actcnt, chassis_info.maxcnt)); | |
709 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", | |
710 | __FILE__, lcd_info.lcd_cmd_reg_addr, | |
711 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, | |
712 | lcd_info.reset_cmd2, lcd_info.act_enable )); | |
713 | ||
714 | /* check the results. Some machines have a buggy PDC */ | |
715 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) | |
716 | goto not_found; | |
717 | ||
718 | switch (lcd_info.model) { | |
719 | case DISPLAY_MODEL_LCD: /* LCD display */ | |
720 | if (chassis_info.actcnt < | |
721 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) | |
722 | goto not_found; | |
723 | if (!lcd_info.act_enable) { | |
724 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); | |
725 | goto not_found; | |
726 | } | |
727 | break; | |
728 | ||
729 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ | |
730 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); | |
731 | goto not_found; | |
732 | ||
733 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ | |
734 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) | |
735 | goto not_found; | |
736 | break; | |
737 | ||
738 | default: | |
739 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", | |
740 | lcd_info.model); | |
741 | goto not_found; | |
742 | } /* switch() */ | |
743 | ||
744 | found: | |
745 | /* register the LCD/LED driver */ | |
746 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); | |
747 | return 0; | |
748 | ||
749 | } else { /* if() */ | |
750 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); | |
751 | } | |
752 | ||
753 | not_found: | |
754 | lcd_info.model = DISPLAY_MODEL_NONE; | |
755 | return 1; | |
756 | } | |
757 | ||
758 | #ifdef CONFIG_PROC_FS | |
759 | module_init(led_create_procfs) | |
760 | #endif |