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Commit | Line | Data |
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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> | |
8a1def45 | 6 | * (c) Copyright 2001-2009 Helge Deller <deller@gmx.de> |
1da177e4 LT |
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> | |
34994952 GG |
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> | |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
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> | |
c59ede7b | 32 | #include <linux/capability.h> |
1da177e4 LT |
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/ctype.h> | |
42 | #include <linux/blkdev.h> | |
34994952 | 43 | #include <linux/workqueue.h> |
e5ed6399 | 44 | #include <linux/rcupdate.h> |
1da177e4 LT |
45 | #include <asm/io.h> |
46 | #include <asm/processor.h> | |
47 | #include <asm/hardware.h> | |
48 | #include <asm/param.h> /* HZ */ | |
49 | #include <asm/led.h> | |
50 | #include <asm/pdc.h> | |
51 | #include <asm/uaccess.h> | |
52 | ||
53 | /* The control of the LEDs and LCDs on PARISC-machines have to be done | |
34994952 GG |
54 | completely in software. The necessary calculations are done in a work queue |
55 | task which is scheduled regularly, and since the calculations may consume a | |
56 | relatively large amount of CPU time, some of the calculations can be | |
1da177e4 LT |
57 | turned off with the following variables (controlled via procfs) */ |
58 | ||
8039de10 | 59 | static int led_type __read_mostly = -1; |
34994952 | 60 | static unsigned char lastleds; /* LED state from most recent update */ |
8039de10 HD |
61 | static unsigned int led_heartbeat __read_mostly = 1; |
62 | static unsigned int led_diskio __read_mostly = 1; | |
63 | static unsigned int led_lanrxtx __read_mostly = 1; | |
64 | static char lcd_text[32] __read_mostly; | |
65 | static char lcd_text_default[32] __read_mostly; | |
1da177e4 | 66 | |
34994952 GG |
67 | |
68 | static struct workqueue_struct *led_wq; | |
6858f3bf DH |
69 | static void led_work_func(struct work_struct *); |
70 | static DECLARE_DELAYED_WORK(led_task, led_work_func); | |
34994952 | 71 | |
1da177e4 LT |
72 | #if 0 |
73 | #define DPRINTK(x) printk x | |
74 | #else | |
75 | #define DPRINTK(x) | |
76 | #endif | |
77 | ||
1da177e4 LT |
78 | struct lcd_block { |
79 | unsigned char command; /* stores the command byte */ | |
80 | unsigned char on; /* value for turning LED on */ | |
81 | unsigned char off; /* value for turning LED off */ | |
82 | }; | |
83 | ||
84 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ | |
85 | /* NOTE: we use unsigned long:16 two times, since the following member | |
86 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ | |
87 | struct pdc_chassis_lcd_info_ret_block { | |
88 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ | |
89 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ | |
90 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ | |
91 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ | |
92 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ | |
93 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ | |
94 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ | |
95 | unsigned char act_enable; /* 0 = no activity (LCD only) */ | |
96 | struct lcd_block heartbeat; | |
97 | struct lcd_block disk_io; | |
98 | struct lcd_block lan_rcv; | |
99 | struct lcd_block lan_tx; | |
100 | char _pad; | |
101 | }; | |
102 | ||
103 | ||
104 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ | |
105 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ | |
106 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) | |
107 | ||
108 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's | |
109 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ | |
110 | static struct pdc_chassis_lcd_info_ret_block | |
8039de10 | 111 | lcd_info __attribute__((aligned(8))) __read_mostly = |
1da177e4 LT |
112 | { |
113 | .model = DISPLAY_MODEL_LCD, | |
114 | .lcd_width = 16, | |
115 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, | |
116 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, | |
117 | .min_cmd_delay = 40, | |
118 | .reset_cmd1 = 0x80, | |
119 | .reset_cmd2 = 0xc0, | |
120 | }; | |
121 | ||
122 | ||
123 | /* direct access to some of the lcd_info variables */ | |
124 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr | |
125 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr | |
126 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ | |
127 | ||
34994952 GG |
128 | #define LED_HASLCD 1 |
129 | #define LED_NOLCD 0 | |
130 | ||
131 | /* The workqueue must be created at init-time */ | |
132 | static int start_task(void) | |
133 | { | |
134 | /* Display the default text now */ | |
135 | if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); | |
136 | ||
137 | /* Create the work queue and queue the LED task */ | |
138 | led_wq = create_singlethread_workqueue("led_wq"); | |
6858f3bf | 139 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 GG |
140 | |
141 | return 0; | |
142 | } | |
143 | ||
144 | device_initcall(start_task); | |
1da177e4 LT |
145 | |
146 | /* ptr to LCD/LED-specific function */ | |
8039de10 | 147 | static void (*led_func_ptr) (unsigned char) __read_mostly; |
1da177e4 | 148 | |
1da177e4 LT |
149 | #ifdef CONFIG_PROC_FS |
150 | static int led_proc_read(char *page, char **start, off_t off, int count, | |
151 | int *eof, void *data) | |
152 | { | |
153 | char *out = page; | |
154 | int len; | |
155 | ||
156 | switch ((long)data) | |
157 | { | |
158 | case LED_NOLCD: | |
159 | out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); | |
160 | out += sprintf(out, "Disk IO: %d\n", led_diskio); | |
161 | out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); | |
162 | break; | |
163 | case LED_HASLCD: | |
164 | out += sprintf(out, "%s\n", lcd_text); | |
165 | break; | |
166 | default: | |
167 | *eof = 1; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | len = out - page - off; | |
172 | if (len < count) { | |
173 | *eof = 1; | |
174 | if (len <= 0) return 0; | |
175 | } else { | |
176 | len = count; | |
177 | } | |
178 | *start = page + off; | |
179 | return len; | |
180 | } | |
181 | ||
182 | static int led_proc_write(struct file *file, const char *buf, | |
183 | unsigned long count, void *data) | |
184 | { | |
185 | char *cur, lbuf[count + 1]; | |
186 | int d; | |
187 | ||
188 | if (!capable(CAP_SYS_ADMIN)) | |
189 | return -EACCES; | |
190 | ||
191 | memset(lbuf, 0, count + 1); | |
192 | ||
193 | if (copy_from_user(lbuf, buf, count)) | |
194 | return -EFAULT; | |
195 | ||
196 | cur = lbuf; | |
197 | ||
1da177e4 LT |
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 int __init led_create_procfs(void) | |
238 | { | |
239 | struct proc_dir_entry *proc_pdc_root = NULL; | |
240 | struct proc_dir_entry *ent; | |
241 | ||
242 | if (led_type == -1) return -1; | |
243 | ||
244 | proc_pdc_root = proc_mkdir("pdc", 0); | |
245 | if (!proc_pdc_root) return -1; | |
1da177e4 LT |
246 | ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); |
247 | if (!ent) return -1; | |
1da177e4 LT |
248 | ent->data = (void *)LED_NOLCD; /* LED */ |
249 | ent->read_proc = led_proc_read; | |
250 | ent->write_proc = led_proc_write; | |
1da177e4 LT |
251 | |
252 | if (led_type == LED_HASLCD) | |
253 | { | |
254 | ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); | |
255 | if (!ent) return -1; | |
1da177e4 LT |
256 | ent->data = (void *)LED_HASLCD; /* LCD */ |
257 | ent->read_proc = led_proc_read; | |
258 | ent->write_proc = led_proc_write; | |
1da177e4 LT |
259 | } |
260 | ||
261 | return 0; | |
262 | } | |
263 | #endif | |
264 | ||
265 | /* | |
266 | ** | |
267 | ** led_ASP_driver() | |
268 | ** | |
269 | */ | |
270 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ | |
271 | #define LED_STROBE 0x02 /* strobe to clock data */ | |
272 | static void led_ASP_driver(unsigned char leds) | |
273 | { | |
274 | int i; | |
275 | ||
276 | leds = ~leds; | |
277 | for (i = 0; i < 8; i++) { | |
278 | unsigned char value; | |
279 | value = (leds & 0x80) >> 7; | |
280 | gsc_writeb( value, LED_DATA_REG ); | |
281 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); | |
282 | leds <<= 1; | |
283 | } | |
284 | } | |
285 | ||
286 | ||
287 | /* | |
288 | ** | |
289 | ** led_LASI_driver() | |
290 | ** | |
291 | */ | |
292 | static void led_LASI_driver(unsigned char leds) | |
293 | { | |
294 | leds = ~leds; | |
295 | gsc_writeb( leds, LED_DATA_REG ); | |
296 | } | |
297 | ||
298 | ||
299 | /* | |
300 | ** | |
301 | ** led_LCD_driver() | |
1da177e4 LT |
302 | ** |
303 | */ | |
304 | static void led_LCD_driver(unsigned char leds) | |
305 | { | |
34994952 GG |
306 | static int i; |
307 | static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, | |
308 | LED_LAN_RCV, LED_LAN_TX }; | |
309 | ||
310 | static struct lcd_block * blockp[4] = { | |
311 | &lcd_info.heartbeat, | |
312 | &lcd_info.disk_io, | |
313 | &lcd_info.lan_rcv, | |
314 | &lcd_info.lan_tx | |
315 | }; | |
316 | ||
317 | /* Convert min_cmd_delay to milliseconds */ | |
318 | unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); | |
1da177e4 | 319 | |
34994952 GG |
320 | for (i=0; i<4; ++i) |
321 | { | |
322 | if ((leds & mask[i]) != (lastleds & mask[i])) | |
323 | { | |
324 | gsc_writeb( blockp[i]->command, LCD_CMD_REG ); | |
325 | msleep(msec_cmd_delay); | |
326 | ||
327 | gsc_writeb( leds & mask[i] ? blockp[i]->on : | |
328 | blockp[i]->off, LCD_DATA_REG ); | |
329 | msleep(msec_cmd_delay); | |
330 | } | |
1da177e4 LT |
331 | } |
332 | } | |
333 | ||
334 | ||
335 | /* | |
336 | ** | |
337 | ** led_get_net_activity() | |
338 | ** | |
93b1fae4 | 339 | ** calculate if there was TX- or RX-throughput on the network interfaces |
1da177e4 LT |
340 | ** (analog to dev_get_info() from net/core/dev.c) |
341 | ** | |
342 | */ | |
343 | static __inline__ int led_get_net_activity(void) | |
344 | { | |
345 | #ifndef CONFIG_NET | |
346 | return 0; | |
347 | #else | |
348 | static unsigned long rx_total_last, tx_total_last; | |
349 | unsigned long rx_total, tx_total; | |
350 | struct net_device *dev; | |
351 | int retval; | |
352 | ||
353 | rx_total = tx_total = 0; | |
354 | ||
246c65ad | 355 | /* we are running as a workqueue task, so we can use an RCU lookup */ |
e5ed6399 | 356 | rcu_read_lock(); |
246c65ad | 357 | for_each_netdev_rcu(&init_net, dev) { |
eeda3fd6 | 358 | const struct net_device_stats *stats; |
e5ed6399 | 359 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
360 | if (!in_dev || !in_dev->ifa_list) |
361 | continue; | |
17159b0b | 362 | if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
1da177e4 | 363 | continue; |
eeda3fd6 | 364 | stats = dev_get_stats(dev); |
1da177e4 LT |
365 | rx_total += stats->rx_packets; |
366 | tx_total += stats->tx_packets; | |
367 | } | |
e5ed6399 | 368 | rcu_read_unlock(); |
1da177e4 LT |
369 | |
370 | retval = 0; | |
371 | ||
372 | if (rx_total != rx_total_last) { | |
373 | rx_total_last = rx_total; | |
374 | retval |= LED_LAN_RCV; | |
375 | } | |
376 | ||
377 | if (tx_total != tx_total_last) { | |
378 | tx_total_last = tx_total; | |
379 | retval |= LED_LAN_TX; | |
380 | } | |
381 | ||
382 | return retval; | |
383 | #endif | |
384 | } | |
385 | ||
386 | ||
387 | /* | |
388 | ** | |
389 | ** led_get_diskio_activity() | |
390 | ** | |
391 | ** calculate if there was disk-io in the system | |
392 | ** | |
393 | */ | |
394 | static __inline__ int led_get_diskio_activity(void) | |
395 | { | |
396 | static unsigned long last_pgpgin, last_pgpgout; | |
f8891e5e | 397 | unsigned long events[NR_VM_EVENT_ITEMS]; |
1da177e4 | 398 | int changed; |
34994952 | 399 | |
f8891e5e | 400 | all_vm_events(events); |
1da177e4 LT |
401 | |
402 | /* Just use a very simple calculation here. Do not care about overflow, | |
403 | since we only want to know if there was activity or not. */ | |
f8891e5e CL |
404 | changed = (events[PGPGIN] != last_pgpgin) || |
405 | (events[PGPGOUT] != last_pgpgout); | |
406 | last_pgpgin = events[PGPGIN]; | |
407 | last_pgpgout = events[PGPGOUT]; | |
34994952 | 408 | |
1da177e4 LT |
409 | return (changed ? LED_DISK_IO : 0); |
410 | } | |
411 | ||
412 | ||
413 | ||
414 | /* | |
34994952 | 415 | ** led_work_func() |
1da177e4 | 416 | ** |
34994952 | 417 | ** manages when and which chassis LCD/LED gets updated |
1da177e4 LT |
418 | |
419 | TODO: | |
420 | - display load average (older machines like 715/64 have 4 "free" LED's for that) | |
421 | - optimizations | |
422 | */ | |
423 | ||
34994952 GG |
424 | #define HEARTBEAT_LEN (HZ*10/100) |
425 | #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) | |
1da177e4 LT |
426 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
427 | ||
34994952 | 428 | #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
1da177e4 | 429 | |
6858f3bf | 430 | static void led_work_func (struct work_struct *unused) |
1da177e4 | 431 | { |
34994952 | 432 | static unsigned long last_jiffies; |
1da177e4 | 433 | static unsigned long count_HZ; /* counter in range 0..HZ */ |
34994952 | 434 | unsigned char currentleds = 0; /* stores current value of the LEDs */ |
1da177e4 LT |
435 | |
436 | /* exit if not initialized */ | |
437 | if (!led_func_ptr) | |
438 | return; | |
439 | ||
34994952 GG |
440 | /* increment the heartbeat timekeeper */ |
441 | count_HZ += jiffies - last_jiffies; | |
442 | last_jiffies = jiffies; | |
443 | if (count_HZ >= HZ) | |
1da177e4 LT |
444 | count_HZ = 0; |
445 | ||
34994952 | 446 | if (likely(led_heartbeat)) |
1da177e4 | 447 | { |
34994952 GG |
448 | /* flash heartbeat-LED like a real heart |
449 | * (2 x short then a long delay) | |
450 | */ | |
451 | if (count_HZ < HEARTBEAT_LEN || | |
452 | (count_HZ >= HEARTBEAT_2ND_RANGE_START && | |
453 | count_HZ < HEARTBEAT_2ND_RANGE_END)) | |
454 | currentleds |= LED_HEARTBEAT; | |
1da177e4 LT |
455 | } |
456 | ||
34994952 GG |
457 | if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
458 | if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); | |
1da177e4 | 459 | |
8a1def45 HD |
460 | /* blink LEDs if we got an Oops (HPMC) */ |
461 | if (unlikely(oops_in_progress)) { | |
462 | if (boot_cpu_data.cpu_type >= pcxl2) { | |
463 | /* newer machines don't have loadavg. LEDs, so we | |
464 | * let all LEDs blink twice per second instead */ | |
465 | currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; | |
466 | } else { | |
467 | /* old machines: blink loadavg. LEDs twice per second */ | |
468 | if (count_HZ <= (HZ/2)) | |
469 | currentleds &= ~(LED4|LED5|LED6|LED7); | |
470 | else | |
471 | currentleds |= (LED4|LED5|LED6|LED7); | |
472 | } | |
473 | } | |
1da177e4 | 474 | |
34994952 GG |
475 | if (currentleds != lastleds) |
476 | { | |
477 | led_func_ptr(currentleds); /* Update the LCD/LEDs */ | |
478 | lastleds = currentleds; | |
479 | } | |
1da177e4 | 480 | |
34994952 GG |
481 | queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
482 | } | |
1da177e4 LT |
483 | |
484 | /* | |
485 | ** led_halt() | |
486 | ** | |
487 | ** called by the reboot notifier chain at shutdown and stops all | |
488 | ** LED/LCD activities. | |
489 | ** | |
490 | */ | |
491 | ||
492 | static int led_halt(struct notifier_block *, unsigned long, void *); | |
493 | ||
494 | static struct notifier_block led_notifier = { | |
495 | .notifier_call = led_halt, | |
496 | }; | |
e041c683 | 497 | static int notifier_disabled = 0; |
1da177e4 LT |
498 | |
499 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) | |
500 | { | |
501 | char *txt; | |
e041c683 AS |
502 | |
503 | if (notifier_disabled) | |
504 | return NOTIFY_OK; | |
505 | ||
506 | notifier_disabled = 1; | |
1da177e4 LT |
507 | switch (event) { |
508 | case SYS_RESTART: txt = "SYSTEM RESTART"; | |
509 | break; | |
510 | case SYS_HALT: txt = "SYSTEM HALT"; | |
511 | break; | |
512 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; | |
513 | break; | |
514 | default: return NOTIFY_DONE; | |
515 | } | |
516 | ||
34994952 GG |
517 | /* Cancel the work item and delete the queue */ |
518 | if (led_wq) { | |
8a1def45 | 519 | cancel_delayed_work_sync(&led_task); |
34994952 GG |
520 | destroy_workqueue(led_wq); |
521 | led_wq = NULL; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | if (lcd_info.model == DISPLAY_MODEL_LCD) |
525 | lcd_print(txt); | |
526 | else | |
527 | if (led_func_ptr) | |
528 | led_func_ptr(0xff); /* turn all LEDs ON */ | |
529 | ||
1da177e4 LT |
530 | return NOTIFY_OK; |
531 | } | |
532 | ||
533 | /* | |
534 | ** register_led_driver() | |
535 | ** | |
536 | ** registers an external LED or LCD for usage by this driver. | |
537 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. | |
538 | ** | |
539 | */ | |
540 | ||
541 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) | |
542 | { | |
543 | static int initialized; | |
544 | ||
545 | if (initialized || !data_reg) | |
546 | return 1; | |
547 | ||
548 | lcd_info.model = model; /* store the values */ | |
549 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; | |
550 | ||
551 | switch (lcd_info.model) { | |
552 | case DISPLAY_MODEL_LCD: | |
553 | LCD_DATA_REG = data_reg; | |
554 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", | |
555 | LCD_CMD_REG , LCD_DATA_REG); | |
556 | led_func_ptr = led_LCD_driver; | |
1da177e4 LT |
557 | led_type = LED_HASLCD; |
558 | break; | |
559 | ||
560 | case DISPLAY_MODEL_LASI: | |
561 | LED_DATA_REG = data_reg; | |
562 | led_func_ptr = led_LASI_driver; | |
563 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); | |
564 | led_type = LED_NOLCD; | |
565 | break; | |
566 | ||
567 | case DISPLAY_MODEL_OLD_ASP: | |
568 | LED_DATA_REG = data_reg; | |
569 | led_func_ptr = led_ASP_driver; | |
570 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", | |
571 | LED_DATA_REG); | |
572 | led_type = LED_NOLCD; | |
573 | break; | |
574 | ||
575 | default: | |
576 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", | |
a8043ecb | 577 | __func__, lcd_info.model); |
1da177e4 LT |
578 | return 1; |
579 | } | |
580 | ||
581 | /* mark the LCD/LED driver now as initialized and | |
582 | * register to the reboot notifier chain */ | |
583 | initialized++; | |
584 | register_reboot_notifier(&led_notifier); | |
585 | ||
34994952 GG |
586 | /* Ensure the work is queued */ |
587 | if (led_wq) { | |
6858f3bf | 588 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 GG |
589 | } |
590 | ||
1da177e4 LT |
591 | return 0; |
592 | } | |
593 | ||
594 | /* | |
595 | ** register_led_regions() | |
596 | ** | |
597 | ** register_led_regions() registers the LCD/LED regions for /procfs. | |
598 | ** At bootup - where the initialisation of the LCD/LED normally happens - | |
599 | ** not all internal structures of request_region() are properly set up, | |
600 | ** so that we delay the led-registration until after busdevices_init() | |
601 | ** has been executed. | |
602 | ** | |
603 | */ | |
604 | ||
605 | void __init register_led_regions(void) | |
606 | { | |
607 | switch (lcd_info.model) { | |
608 | case DISPLAY_MODEL_LCD: | |
609 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); | |
610 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); | |
611 | break; | |
612 | case DISPLAY_MODEL_LASI: | |
613 | case DISPLAY_MODEL_OLD_ASP: | |
614 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); | |
615 | break; | |
616 | } | |
617 | } | |
618 | ||
619 | ||
620 | /* | |
621 | ** | |
622 | ** lcd_print() | |
623 | ** | |
624 | ** Displays the given string on the LCD-Display of newer machines. | |
34994952 GG |
625 | ** lcd_print() disables/enables the timer-based led work queue to |
626 | ** avoid a race condition while writing the CMD/DATA register pair. | |
1da177e4 LT |
627 | ** |
628 | */ | |
6e16d940 | 629 | int lcd_print( const char *str ) |
1da177e4 LT |
630 | { |
631 | int i; | |
632 | ||
633 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) | |
634 | return 0; | |
635 | ||
34994952 GG |
636 | /* temporarily disable the led work task */ |
637 | if (led_wq) | |
8a1def45 | 638 | cancel_delayed_work_sync(&led_task); |
1da177e4 LT |
639 | |
640 | /* copy display string to buffer for procfs */ | |
641 | strlcpy(lcd_text, str, sizeof(lcd_text)); | |
34994952 | 642 | |
1da177e4 LT |
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 | ||
34994952 GG |
656 | /* re-queue the work */ |
657 | if (led_wq) { | |
6858f3bf | 658 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 | 659 | } |
1da177e4 LT |
660 | |
661 | return lcd_info.lcd_width; | |
662 | } | |
663 | ||
664 | /* | |
665 | ** led_init() | |
666 | ** | |
667 | ** led_init() is called very early in the bootup-process from setup.c | |
668 | ** and asks the PDC for an usable chassis LCD or LED. | |
669 | ** If the PDC doesn't return any info, then the LED | |
670 | ** is detected by lasi.c or asp.c and registered with the | |
671 | ** above functions lasi_led_init() or asp_led_init(). | |
672 | ** KittyHawk machines have often a buggy PDC, so that | |
673 | ** we explicitly check for those machines here. | |
674 | */ | |
675 | ||
676 | int __init led_init(void) | |
677 | { | |
678 | struct pdc_chassis_info chassis_info; | |
679 | int ret; | |
680 | ||
681 | snprintf(lcd_text_default, sizeof(lcd_text_default), | |
96b644bd | 682 | "Linux %s", init_utsname()->release); |
1da177e4 LT |
683 | |
684 | /* Work around the buggy PDC of KittyHawk-machines */ | |
685 | switch (CPU_HVERSION) { | |
686 | case 0x580: /* KittyHawk DC2-100 (K100) */ | |
687 | case 0x581: /* KittyHawk DC3-120 (K210) */ | |
688 | case 0x582: /* KittyHawk DC3 100 (K400) */ | |
689 | case 0x583: /* KittyHawk DC3 120 (K410) */ | |
690 | case 0x58B: /* KittyHawk DC2 100 (K200) */ | |
691 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " | |
692 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); | |
693 | goto found; /* use the preinitialized values of lcd_info */ | |
694 | } | |
695 | ||
696 | /* initialize the struct, so that we can check for valid return values */ | |
697 | lcd_info.model = DISPLAY_MODEL_NONE; | |
698 | chassis_info.actcnt = chassis_info.maxcnt = 0; | |
699 | ||
700 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); | |
701 | if (ret == PDC_OK) { | |
702 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " | |
703 | "lcd_width=%d, cmd_delay=%u,\n" | |
704 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", | |
705 | __FILE__, lcd_info.model, | |
706 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : | |
707 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", | |
708 | lcd_info.lcd_width, lcd_info.min_cmd_delay, | |
709 | __FILE__, sizeof(lcd_info), | |
710 | chassis_info.actcnt, chassis_info.maxcnt)); | |
711 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", | |
712 | __FILE__, lcd_info.lcd_cmd_reg_addr, | |
713 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, | |
714 | lcd_info.reset_cmd2, lcd_info.act_enable )); | |
715 | ||
716 | /* check the results. Some machines have a buggy PDC */ | |
717 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) | |
718 | goto not_found; | |
719 | ||
720 | switch (lcd_info.model) { | |
721 | case DISPLAY_MODEL_LCD: /* LCD display */ | |
722 | if (chassis_info.actcnt < | |
723 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) | |
724 | goto not_found; | |
725 | if (!lcd_info.act_enable) { | |
726 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); | |
727 | goto not_found; | |
728 | } | |
729 | break; | |
730 | ||
731 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ | |
732 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); | |
733 | goto not_found; | |
734 | ||
735 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ | |
736 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) | |
737 | goto not_found; | |
738 | break; | |
739 | ||
740 | default: | |
741 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", | |
742 | lcd_info.model); | |
743 | goto not_found; | |
744 | } /* switch() */ | |
745 | ||
746 | found: | |
747 | /* register the LCD/LED driver */ | |
748 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); | |
749 | return 0; | |
750 | ||
751 | } else { /* if() */ | |
752 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); | |
753 | } | |
754 | ||
755 | not_found: | |
756 | lcd_info.model = DISPLAY_MODEL_NONE; | |
757 | return 1; | |
758 | } | |
759 | ||
e041c683 AS |
760 | static void __exit led_exit(void) |
761 | { | |
762 | unregister_reboot_notifier(&led_notifier); | |
763 | return; | |
764 | } | |
765 | ||
1da177e4 LT |
766 | #ifdef CONFIG_PROC_FS |
767 | module_init(led_create_procfs) | |
768 | #endif |