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