Root/
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 | static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */ |
68 | |
69 | |
70 | static struct workqueue_struct *led_wq; |
71 | static void led_work_func(struct work_struct *); |
72 | static DECLARE_DELAYED_WORK(led_task, led_work_func); |
73 | |
74 | #if 0 |
75 | #define DPRINTK(x) printk x |
76 | #else |
77 | #define DPRINTK(x) |
78 | #endif |
79 | |
80 | struct lcd_block { |
81 | unsigned char command; /* stores the command byte */ |
82 | unsigned char on; /* value for turning LED on */ |
83 | unsigned char off; /* value for turning LED off */ |
84 | }; |
85 | |
86 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ |
87 | /* NOTE: we use unsigned long:16 two times, since the following member |
88 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ |
89 | struct pdc_chassis_lcd_info_ret_block { |
90 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ |
91 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ |
92 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ |
93 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ |
94 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ |
95 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ |
96 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ |
97 | unsigned char act_enable; /* 0 = no activity (LCD only) */ |
98 | struct lcd_block heartbeat; |
99 | struct lcd_block disk_io; |
100 | struct lcd_block lan_rcv; |
101 | struct lcd_block lan_tx; |
102 | char _pad; |
103 | }; |
104 | |
105 | |
106 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ |
107 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ |
108 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) |
109 | |
110 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's |
111 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ |
112 | static struct pdc_chassis_lcd_info_ret_block |
113 | lcd_info __attribute__((aligned(8))) __read_mostly = |
114 | { |
115 | .model = DISPLAY_MODEL_LCD, |
116 | .lcd_width = 16, |
117 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, |
118 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, |
119 | .min_cmd_delay = 80, |
120 | .reset_cmd1 = 0x80, |
121 | .reset_cmd2 = 0xc0, |
122 | }; |
123 | |
124 | |
125 | /* direct access to some of the lcd_info variables */ |
126 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr |
127 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr |
128 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ |
129 | |
130 | #define LED_HASLCD 1 |
131 | #define LED_NOLCD 0 |
132 | |
133 | /* The workqueue must be created at init-time */ |
134 | static int start_task(void) |
135 | { |
136 | /* Display the default text now */ |
137 | if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); |
138 | |
139 | /* KittyHawk has no LED support on its LCD */ |
140 | if (lcd_no_led_support) return 0; |
141 | |
142 | /* Create the work queue and queue the LED task */ |
143 | led_wq = create_singlethread_workqueue("led_wq"); |
144 | queue_delayed_work(led_wq, &led_task, 0); |
145 | |
146 | return 0; |
147 | } |
148 | |
149 | device_initcall(start_task); |
150 | |
151 | /* ptr to LCD/LED-specific function */ |
152 | static void (*led_func_ptr) (unsigned char) __read_mostly; |
153 | |
154 | #ifdef CONFIG_PROC_FS |
155 | static int led_proc_show(struct seq_file *m, void *v) |
156 | { |
157 | switch ((long)m->private) |
158 | { |
159 | case LED_NOLCD: |
160 | seq_printf(m, "Heartbeat: %d\n", led_heartbeat); |
161 | seq_printf(m, "Disk IO: %d\n", led_diskio); |
162 | seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx); |
163 | break; |
164 | case LED_HASLCD: |
165 | seq_printf(m, "%s\n", lcd_text); |
166 | break; |
167 | default: |
168 | return 0; |
169 | } |
170 | return 0; |
171 | } |
172 | |
173 | static int led_proc_open(struct inode *inode, struct file *file) |
174 | { |
175 | return single_open(file, led_proc_show, PDE(inode)->data); |
176 | } |
177 | |
178 | |
179 | static ssize_t led_proc_write(struct file *file, const char *buf, |
180 | size_t count, loff_t *pos) |
181 | { |
182 | void *data = PDE(file->f_path.dentry->d_inode)->data; |
183 | char *cur, lbuf[32]; |
184 | int d; |
185 | |
186 | if (!capable(CAP_SYS_ADMIN)) |
187 | return -EACCES; |
188 | |
189 | if (count >= sizeof(lbuf)) |
190 | count = sizeof(lbuf)-1; |
191 | |
192 | if (copy_from_user(lbuf, buf, count)) |
193 | return -EFAULT; |
194 | lbuf[count] = 0; |
195 | |
196 | cur = lbuf; |
197 | |
198 | 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 | |
231 | parse_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 | |
237 | static const struct file_operations led_proc_fops = { |
238 | .owner = THIS_MODULE, |
239 | .open = led_proc_open, |
240 | .read = seq_read, |
241 | .llseek = seq_lseek, |
242 | .release = single_release, |
243 | .write = led_proc_write, |
244 | }; |
245 | |
246 | static int __init led_create_procfs(void) |
247 | { |
248 | struct proc_dir_entry *proc_pdc_root = NULL; |
249 | struct proc_dir_entry *ent; |
250 | |
251 | if (led_type == -1) return -1; |
252 | |
253 | proc_pdc_root = proc_mkdir("pdc", 0); |
254 | if (!proc_pdc_root) return -1; |
255 | |
256 | if (!lcd_no_led_support) |
257 | { |
258 | ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, |
259 | &led_proc_fops, (void *)LED_NOLCD); /* LED */ |
260 | if (!ent) return -1; |
261 | } |
262 | |
263 | if (led_type == LED_HASLCD) |
264 | { |
265 | ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, |
266 | &led_proc_fops, (void *)LED_HASLCD); /* LCD */ |
267 | if (!ent) return -1; |
268 | } |
269 | |
270 | return 0; |
271 | } |
272 | #endif |
273 | |
274 | /* |
275 | ** |
276 | ** led_ASP_driver() |
277 | ** |
278 | */ |
279 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ |
280 | #define LED_STROBE 0x02 /* strobe to clock data */ |
281 | static void led_ASP_driver(unsigned char leds) |
282 | { |
283 | int i; |
284 | |
285 | leds = ~leds; |
286 | for (i = 0; i < 8; i++) { |
287 | unsigned char value; |
288 | value = (leds & 0x80) >> 7; |
289 | gsc_writeb( value, LED_DATA_REG ); |
290 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); |
291 | leds <<= 1; |
292 | } |
293 | } |
294 | |
295 | |
296 | /* |
297 | ** |
298 | ** led_LASI_driver() |
299 | ** |
300 | */ |
301 | static void led_LASI_driver(unsigned char leds) |
302 | { |
303 | leds = ~leds; |
304 | gsc_writeb( leds, LED_DATA_REG ); |
305 | } |
306 | |
307 | |
308 | /* |
309 | ** |
310 | ** led_LCD_driver() |
311 | ** |
312 | */ |
313 | static void led_LCD_driver(unsigned char leds) |
314 | { |
315 | static int i; |
316 | static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, |
317 | LED_LAN_RCV, LED_LAN_TX }; |
318 | |
319 | static struct lcd_block * blockp[4] = { |
320 | &lcd_info.heartbeat, |
321 | &lcd_info.disk_io, |
322 | &lcd_info.lan_rcv, |
323 | &lcd_info.lan_tx |
324 | }; |
325 | |
326 | /* Convert min_cmd_delay to milliseconds */ |
327 | unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); |
328 | |
329 | for (i=0; i<4; ++i) |
330 | { |
331 | if ((leds & mask[i]) != (lastleds & mask[i])) |
332 | { |
333 | gsc_writeb( blockp[i]->command, LCD_CMD_REG ); |
334 | msleep(msec_cmd_delay); |
335 | |
336 | gsc_writeb( leds & mask[i] ? blockp[i]->on : |
337 | blockp[i]->off, LCD_DATA_REG ); |
338 | msleep(msec_cmd_delay); |
339 | } |
340 | } |
341 | } |
342 | |
343 | |
344 | /* |
345 | ** |
346 | ** led_get_net_activity() |
347 | ** |
348 | ** calculate if there was TX- or RX-throughput on the network interfaces |
349 | ** (analog to dev_get_info() from net/core/dev.c) |
350 | ** |
351 | */ |
352 | static __inline__ int led_get_net_activity(void) |
353 | { |
354 | #ifndef CONFIG_NET |
355 | return 0; |
356 | #else |
357 | static u64 rx_total_last, tx_total_last; |
358 | u64 rx_total, tx_total; |
359 | struct net_device *dev; |
360 | int retval; |
361 | |
362 | rx_total = tx_total = 0; |
363 | |
364 | /* we are running as a workqueue task, so we can use an RCU lookup */ |
365 | rcu_read_lock(); |
366 | for_each_netdev_rcu(&init_net, dev) { |
367 | const struct rtnl_link_stats64 *stats; |
368 | struct rtnl_link_stats64 temp; |
369 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
370 | if (!in_dev || !in_dev->ifa_list) |
371 | continue; |
372 | if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
373 | continue; |
374 | stats = dev_get_stats(dev, &temp); |
375 | rx_total += stats->rx_packets; |
376 | tx_total += stats->tx_packets; |
377 | } |
378 | rcu_read_unlock(); |
379 | |
380 | retval = 0; |
381 | |
382 | if (rx_total != rx_total_last) { |
383 | rx_total_last = rx_total; |
384 | retval |= LED_LAN_RCV; |
385 | } |
386 | |
387 | if (tx_total != tx_total_last) { |
388 | tx_total_last = tx_total; |
389 | retval |= LED_LAN_TX; |
390 | } |
391 | |
392 | return retval; |
393 | #endif |
394 | } |
395 | |
396 | |
397 | /* |
398 | ** |
399 | ** led_get_diskio_activity() |
400 | ** |
401 | ** calculate if there was disk-io in the system |
402 | ** |
403 | */ |
404 | static __inline__ int led_get_diskio_activity(void) |
405 | { |
406 | static unsigned long last_pgpgin, last_pgpgout; |
407 | unsigned long events[NR_VM_EVENT_ITEMS]; |
408 | int changed; |
409 | |
410 | all_vm_events(events); |
411 | |
412 | /* Just use a very simple calculation here. Do not care about overflow, |
413 | since we only want to know if there was activity or not. */ |
414 | changed = (events[PGPGIN] != last_pgpgin) || |
415 | (events[PGPGOUT] != last_pgpgout); |
416 | last_pgpgin = events[PGPGIN]; |
417 | last_pgpgout = events[PGPGOUT]; |
418 | |
419 | return (changed ? LED_DISK_IO : 0); |
420 | } |
421 | |
422 | |
423 | |
424 | /* |
425 | ** led_work_func() |
426 | ** |
427 | ** manages when and which chassis LCD/LED gets updated |
428 | |
429 | TODO: |
430 | - display load average (older machines like 715/64 have 4 "free" LED's for that) |
431 | - optimizations |
432 | */ |
433 | |
434 | #define HEARTBEAT_LEN (HZ*10/100) |
435 | #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) |
436 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
437 | |
438 | #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
439 | |
440 | static void led_work_func (struct work_struct *unused) |
441 | { |
442 | static unsigned long last_jiffies; |
443 | static unsigned long count_HZ; /* counter in range 0..HZ */ |
444 | unsigned char currentleds = 0; /* stores current value of the LEDs */ |
445 | |
446 | /* exit if not initialized */ |
447 | if (!led_func_ptr) |
448 | return; |
449 | |
450 | /* increment the heartbeat timekeeper */ |
451 | count_HZ += jiffies - last_jiffies; |
452 | last_jiffies = jiffies; |
453 | if (count_HZ >= HZ) |
454 | count_HZ = 0; |
455 | |
456 | if (likely(led_heartbeat)) |
457 | { |
458 | /* flash heartbeat-LED like a real heart |
459 | * (2 x short then a long delay) |
460 | */ |
461 | if (count_HZ < HEARTBEAT_LEN || |
462 | (count_HZ >= HEARTBEAT_2ND_RANGE_START && |
463 | count_HZ < HEARTBEAT_2ND_RANGE_END)) |
464 | currentleds |= LED_HEARTBEAT; |
465 | } |
466 | |
467 | if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
468 | if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); |
469 | |
470 | /* blink LEDs if we got an Oops (HPMC) */ |
471 | if (unlikely(oops_in_progress)) { |
472 | if (boot_cpu_data.cpu_type >= pcxl2) { |
473 | /* newer machines don't have loadavg. LEDs, so we |
474 | * let all LEDs blink twice per second instead */ |
475 | currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; |
476 | } else { |
477 | /* old machines: blink loadavg. LEDs twice per second */ |
478 | if (count_HZ <= (HZ/2)) |
479 | currentleds &= ~(LED4|LED5|LED6|LED7); |
480 | else |
481 | currentleds |= (LED4|LED5|LED6|LED7); |
482 | } |
483 | } |
484 | |
485 | if (currentleds != lastleds) |
486 | { |
487 | led_func_ptr(currentleds); /* Update the LCD/LEDs */ |
488 | lastleds = currentleds; |
489 | } |
490 | |
491 | queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
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 | static int notifier_disabled = 0; |
508 | |
509 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) |
510 | { |
511 | char *txt; |
512 | |
513 | if (notifier_disabled) |
514 | return NOTIFY_OK; |
515 | |
516 | notifier_disabled = 1; |
517 | switch (event) { |
518 | case SYS_RESTART: txt = "SYSTEM RESTART"; |
519 | break; |
520 | case SYS_HALT: txt = "SYSTEM HALT"; |
521 | break; |
522 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; |
523 | break; |
524 | default: return NOTIFY_DONE; |
525 | } |
526 | |
527 | /* Cancel the work item and delete the queue */ |
528 | if (led_wq) { |
529 | cancel_delayed_work_sync(&led_task); |
530 | destroy_workqueue(led_wq); |
531 | led_wq = NULL; |
532 | } |
533 | |
534 | if (lcd_info.model == DISPLAY_MODEL_LCD) |
535 | lcd_print(txt); |
536 | else |
537 | if (led_func_ptr) |
538 | led_func_ptr(0xff); /* turn all LEDs ON */ |
539 | |
540 | return NOTIFY_OK; |
541 | } |
542 | |
543 | /* |
544 | ** register_led_driver() |
545 | ** |
546 | ** registers an external LED or LCD for usage by this driver. |
547 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. |
548 | ** |
549 | */ |
550 | |
551 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) |
552 | { |
553 | static int initialized; |
554 | |
555 | if (initialized || !data_reg) |
556 | return 1; |
557 | |
558 | lcd_info.model = model; /* store the values */ |
559 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; |
560 | |
561 | switch (lcd_info.model) { |
562 | case DISPLAY_MODEL_LCD: |
563 | LCD_DATA_REG = data_reg; |
564 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", |
565 | LCD_CMD_REG , LCD_DATA_REG); |
566 | led_func_ptr = led_LCD_driver; |
567 | led_type = LED_HASLCD; |
568 | break; |
569 | |
570 | case DISPLAY_MODEL_LASI: |
571 | LED_DATA_REG = data_reg; |
572 | led_func_ptr = led_LASI_driver; |
573 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); |
574 | led_type = LED_NOLCD; |
575 | break; |
576 | |
577 | case DISPLAY_MODEL_OLD_ASP: |
578 | LED_DATA_REG = data_reg; |
579 | led_func_ptr = led_ASP_driver; |
580 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", |
581 | LED_DATA_REG); |
582 | led_type = LED_NOLCD; |
583 | break; |
584 | |
585 | default: |
586 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", |
587 | __func__, lcd_info.model); |
588 | return 1; |
589 | } |
590 | |
591 | /* mark the LCD/LED driver now as initialized and |
592 | * register to the reboot notifier chain */ |
593 | initialized++; |
594 | register_reboot_notifier(&led_notifier); |
595 | |
596 | /* Ensure the work is queued */ |
597 | if (led_wq) { |
598 | queue_delayed_work(led_wq, &led_task, 0); |
599 | } |
600 | |
601 | return 0; |
602 | } |
603 | |
604 | /* |
605 | ** register_led_regions() |
606 | ** |
607 | ** register_led_regions() registers the LCD/LED regions for /procfs. |
608 | ** At bootup - where the initialisation of the LCD/LED normally happens - |
609 | ** not all internal structures of request_region() are properly set up, |
610 | ** so that we delay the led-registration until after busdevices_init() |
611 | ** has been executed. |
612 | ** |
613 | */ |
614 | |
615 | void __init register_led_regions(void) |
616 | { |
617 | switch (lcd_info.model) { |
618 | case DISPLAY_MODEL_LCD: |
619 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); |
620 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); |
621 | break; |
622 | case DISPLAY_MODEL_LASI: |
623 | case DISPLAY_MODEL_OLD_ASP: |
624 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); |
625 | break; |
626 | } |
627 | } |
628 | |
629 | |
630 | /* |
631 | ** |
632 | ** lcd_print() |
633 | ** |
634 | ** Displays the given string on the LCD-Display of newer machines. |
635 | ** lcd_print() disables/enables the timer-based led work queue to |
636 | ** avoid a race condition while writing the CMD/DATA register pair. |
637 | ** |
638 | */ |
639 | int lcd_print( const char *str ) |
640 | { |
641 | int i; |
642 | |
643 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) |
644 | return 0; |
645 | |
646 | /* temporarily disable the led work task */ |
647 | if (led_wq) |
648 | cancel_delayed_work_sync(&led_task); |
649 | |
650 | /* copy display string to buffer for procfs */ |
651 | strlcpy(lcd_text, str, sizeof(lcd_text)); |
652 | |
653 | /* Set LCD Cursor to 1st character */ |
654 | gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); |
655 | udelay(lcd_info.min_cmd_delay); |
656 | |
657 | /* Print the string */ |
658 | for (i=0; i < lcd_info.lcd_width; i++) { |
659 | if (str && *str) |
660 | gsc_writeb(*str++, LCD_DATA_REG); |
661 | else |
662 | gsc_writeb(' ', LCD_DATA_REG); |
663 | udelay(lcd_info.min_cmd_delay); |
664 | } |
665 | |
666 | /* re-queue the work */ |
667 | if (led_wq) { |
668 | queue_delayed_work(led_wq, &led_task, 0); |
669 | } |
670 | |
671 | return lcd_info.lcd_width; |
672 | } |
673 | |
674 | /* |
675 | ** led_init() |
676 | ** |
677 | ** led_init() is called very early in the bootup-process from setup.c |
678 | ** and asks the PDC for an usable chassis LCD or LED. |
679 | ** If the PDC doesn't return any info, then the LED |
680 | ** is detected by lasi.c or asp.c and registered with the |
681 | ** above functions lasi_led_init() or asp_led_init(). |
682 | ** KittyHawk machines have often a buggy PDC, so that |
683 | ** we explicitly check for those machines here. |
684 | */ |
685 | |
686 | int __init led_init(void) |
687 | { |
688 | struct pdc_chassis_info chassis_info; |
689 | int ret; |
690 | |
691 | snprintf(lcd_text_default, sizeof(lcd_text_default), |
692 | "Linux %s", init_utsname()->release); |
693 | |
694 | /* Work around the buggy PDC of KittyHawk-machines */ |
695 | switch (CPU_HVERSION) { |
696 | case 0x580: /* KittyHawk DC2-100 (K100) */ |
697 | case 0x581: /* KittyHawk DC3-120 (K210) */ |
698 | case 0x582: /* KittyHawk DC3 100 (K400) */ |
699 | case 0x583: /* KittyHawk DC3 120 (K410) */ |
700 | case 0x58B: /* KittyHawk DC2 100 (K200) */ |
701 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " |
702 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); |
703 | lcd_no_led_support = 1; |
704 | goto found; /* use the preinitialized values of lcd_info */ |
705 | } |
706 | |
707 | /* initialize the struct, so that we can check for valid return values */ |
708 | lcd_info.model = DISPLAY_MODEL_NONE; |
709 | chassis_info.actcnt = chassis_info.maxcnt = 0; |
710 | |
711 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); |
712 | if (ret == PDC_OK) { |
713 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " |
714 | "lcd_width=%d, cmd_delay=%u,\n" |
715 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", |
716 | __FILE__, lcd_info.model, |
717 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : |
718 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", |
719 | lcd_info.lcd_width, lcd_info.min_cmd_delay, |
720 | __FILE__, sizeof(lcd_info), |
721 | chassis_info.actcnt, chassis_info.maxcnt)); |
722 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", |
723 | __FILE__, lcd_info.lcd_cmd_reg_addr, |
724 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, |
725 | lcd_info.reset_cmd2, lcd_info.act_enable )); |
726 | |
727 | /* check the results. Some machines have a buggy PDC */ |
728 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) |
729 | goto not_found; |
730 | |
731 | switch (lcd_info.model) { |
732 | case DISPLAY_MODEL_LCD: /* LCD display */ |
733 | if (chassis_info.actcnt < |
734 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) |
735 | goto not_found; |
736 | if (!lcd_info.act_enable) { |
737 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); |
738 | goto not_found; |
739 | } |
740 | break; |
741 | |
742 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ |
743 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); |
744 | goto not_found; |
745 | |
746 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ |
747 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) |
748 | goto not_found; |
749 | break; |
750 | |
751 | default: |
752 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", |
753 | lcd_info.model); |
754 | goto not_found; |
755 | } /* switch() */ |
756 | |
757 | found: |
758 | /* register the LCD/LED driver */ |
759 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); |
760 | return 0; |
761 | |
762 | } else { /* if() */ |
763 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); |
764 | } |
765 | |
766 | not_found: |
767 | lcd_info.model = DISPLAY_MODEL_NONE; |
768 | return 1; |
769 | } |
770 | |
771 | static void __exit led_exit(void) |
772 | { |
773 | unregister_reboot_notifier(&led_notifier); |
774 | return; |
775 | } |
776 | |
777 | #ifdef CONFIG_PROC_FS |
778 | module_init(led_create_procfs) |
779 | #endif |
780 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9