lockd: handle fl_grant callbacks
[pv_ops_mirror.git] / drivers / parisc / led.c
blobd190c05d87edf3e8b598dd74576704eafad6bcbf
1 /*
2 * Chassis LCD/LED driver for HP-PARISC workstations
4 * (c) Copyright 2000 Red Hat Software
5 * (c) Copyright 2000 Helge Deller <hdeller@redhat.com>
6 * (c) Copyright 2001-2005 Helge Deller <deller@gmx.de>
7 * (c) Copyright 2001 Randolph Chung <tausq@debian.org>
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.
14 * TODO:
15 * - speed-up calculations with inlined assembler
16 * - interface to write to second row of LCD from /proc (if technically possible)
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>
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/ctype.h>
42 #include <linux/blkdev.h>
43 #include <linux/workqueue.h>
44 #include <linux/rcupdate.h>
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>
53 /* The control of the LEDs and LCDs on PARISC-machines have to be done
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
57 turned off with the following variables (controlled via procfs) */
59 static int led_type __read_mostly = -1;
60 static unsigned char lastleds; /* LED state from most recent update */
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;
68 static struct workqueue_struct *led_wq;
69 static void led_work_func(struct work_struct *);
70 static DECLARE_DELAYED_WORK(led_task, led_work_func);
72 #if 0
73 #define DPRINTK(x) printk x
74 #else
75 #define DPRINTK(x)
76 #endif
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 */
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;
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)
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
111 lcd_info __attribute__((aligned(8))) __read_mostly =
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,
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 */
128 #define LED_HASLCD 1
129 #define LED_NOLCD 0
131 /* The workqueue must be created at init-time */
132 static int start_task(void)
134 /* Display the default text now */
135 if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
137 /* Create the work queue and queue the LED task */
138 led_wq = create_singlethread_workqueue("led_wq");
139 queue_delayed_work(led_wq, &led_task, 0);
141 return 0;
144 device_initcall(start_task);
146 /* ptr to LCD/LED-specific function */
147 static void (*led_func_ptr) (unsigned char) __read_mostly;
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)
153 char *out = page;
154 int len;
156 switch ((long)data)
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;
171 len = out - page - off;
172 if (len < count) {
173 *eof = 1;
174 if (len <= 0) return 0;
175 } else {
176 len = count;
178 *start = page + off;
179 return len;
182 static int led_proc_write(struct file *file, const char *buf,
183 unsigned long count, void *data)
185 char *cur, lbuf[count + 1];
186 int d;
188 if (!capable(CAP_SYS_ADMIN))
189 return -EACCES;
191 memset(lbuf, 0, count + 1);
193 if (copy_from_user(lbuf, buf, count))
194 return -EFAULT;
196 cur = lbuf;
198 /* skip initial spaces */
199 while (*cur && isspace(*cur))
201 cur++;
204 switch ((long)data)
206 case LED_NOLCD:
207 d = *cur++ - '0';
208 if (d != 0 && d != 1) goto parse_error;
209 led_heartbeat = d;
211 if (*cur++ != ' ') goto parse_error;
213 d = *cur++ - '0';
214 if (d != 0 && d != 1) goto parse_error;
215 led_diskio = d;
217 if (*cur++ != ' ') goto parse_error;
219 d = *cur++ - '0';
220 if (d != 0 && d != 1) goto parse_error;
221 led_lanrxtx = d;
223 break;
224 case LED_HASLCD:
225 if (*cur && cur[strlen(cur)-1] == '\n')
226 cur[strlen(cur)-1] = 0;
227 if (*cur == 0)
228 cur = lcd_text_default;
229 lcd_print(cur);
230 break;
231 default:
232 return 0;
235 return count;
237 parse_error:
238 if ((long)data == LED_NOLCD)
239 printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
240 return -EINVAL;
243 static int __init led_create_procfs(void)
245 struct proc_dir_entry *proc_pdc_root = NULL;
246 struct proc_dir_entry *ent;
248 if (led_type == -1) return -1;
250 proc_pdc_root = proc_mkdir("pdc", 0);
251 if (!proc_pdc_root) return -1;
252 proc_pdc_root->owner = THIS_MODULE;
253 ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
254 if (!ent) return -1;
255 ent->data = (void *)LED_NOLCD; /* LED */
256 ent->read_proc = led_proc_read;
257 ent->write_proc = led_proc_write;
258 ent->owner = THIS_MODULE;
260 if (led_type == LED_HASLCD)
262 ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root);
263 if (!ent) return -1;
264 ent->data = (void *)LED_HASLCD; /* LCD */
265 ent->read_proc = led_proc_read;
266 ent->write_proc = led_proc_write;
267 ent->owner = THIS_MODULE;
270 return 0;
272 #endif
276 ** led_ASP_driver()
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)
283 int i;
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;
298 ** led_LASI_driver()
301 static void led_LASI_driver(unsigned char leds)
303 leds = ~leds;
304 gsc_writeb( leds, LED_DATA_REG );
310 ** led_LCD_driver()
313 static void led_LCD_driver(unsigned char leds)
315 static int i;
316 static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO,
317 LED_LAN_RCV, LED_LAN_TX };
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
326 /* Convert min_cmd_delay to milliseconds */
327 unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000);
329 for (i=0; i<4; ++i)
331 if ((leds & mask[i]) != (lastleds & mask[i]))
333 gsc_writeb( blockp[i]->command, LCD_CMD_REG );
334 msleep(msec_cmd_delay);
336 gsc_writeb( leds & mask[i] ? blockp[i]->on :
337 blockp[i]->off, LCD_DATA_REG );
338 msleep(msec_cmd_delay);
346 ** led_get_net_activity()
348 ** calculate if there was TX- or RX-throughput on the network interfaces
349 ** (analog to dev_get_info() from net/core/dev.c)
352 static __inline__ int led_get_net_activity(void)
354 #ifndef CONFIG_NET
355 return 0;
356 #else
357 static unsigned long rx_total_last, tx_total_last;
358 unsigned long rx_total, tx_total;
359 struct net_device *dev;
360 int retval;
362 rx_total = tx_total = 0;
364 /* we are running as a workqueue task, so locking dev_base
365 * for reading should be OK */
366 read_lock(&dev_base_lock);
367 rcu_read_lock();
368 for (dev = dev_base; dev; dev = dev->next) {
369 struct net_device_stats *stats;
370 struct in_device *in_dev = __in_dev_get_rcu(dev);
371 if (!in_dev || !in_dev->ifa_list)
372 continue;
373 if (LOOPBACK(in_dev->ifa_list->ifa_local))
374 continue;
375 if (!dev->get_stats)
376 continue;
377 stats = dev->get_stats(dev);
378 rx_total += stats->rx_packets;
379 tx_total += stats->tx_packets;
381 rcu_read_unlock();
382 read_unlock(&dev_base_lock);
384 retval = 0;
386 if (rx_total != rx_total_last) {
387 rx_total_last = rx_total;
388 retval |= LED_LAN_RCV;
391 if (tx_total != tx_total_last) {
392 tx_total_last = tx_total;
393 retval |= LED_LAN_TX;
396 return retval;
397 #endif
403 ** led_get_diskio_activity()
405 ** calculate if there was disk-io in the system
408 static __inline__ int led_get_diskio_activity(void)
410 static unsigned long last_pgpgin, last_pgpgout;
411 unsigned long events[NR_VM_EVENT_ITEMS];
412 int changed;
414 all_vm_events(events);
416 /* Just use a very simple calculation here. Do not care about overflow,
417 since we only want to know if there was activity or not. */
418 changed = (events[PGPGIN] != last_pgpgin) ||
419 (events[PGPGOUT] != last_pgpgout);
420 last_pgpgin = events[PGPGIN];
421 last_pgpgout = events[PGPGOUT];
423 return (changed ? LED_DISK_IO : 0);
429 ** led_work_func()
431 ** manages when and which chassis LCD/LED gets updated
433 TODO:
434 - display load average (older machines like 715/64 have 4 "free" LED's for that)
435 - optimizations
438 #define HEARTBEAT_LEN (HZ*10/100)
439 #define HEARTBEAT_2ND_RANGE_START (HZ*28/100)
440 #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN)
442 #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000))
444 static void led_work_func (struct work_struct *unused)
446 static unsigned long last_jiffies;
447 static unsigned long count_HZ; /* counter in range 0..HZ */
448 unsigned char currentleds = 0; /* stores current value of the LEDs */
450 /* exit if not initialized */
451 if (!led_func_ptr)
452 return;
454 /* increment the heartbeat timekeeper */
455 count_HZ += jiffies - last_jiffies;
456 last_jiffies = jiffies;
457 if (count_HZ >= HZ)
458 count_HZ = 0;
460 if (likely(led_heartbeat))
462 /* flash heartbeat-LED like a real heart
463 * (2 x short then a long delay)
465 if (count_HZ < HEARTBEAT_LEN ||
466 (count_HZ >= HEARTBEAT_2ND_RANGE_START &&
467 count_HZ < HEARTBEAT_2ND_RANGE_END))
468 currentleds |= LED_HEARTBEAT;
471 if (likely(led_lanrxtx)) currentleds |= led_get_net_activity();
472 if (likely(led_diskio)) currentleds |= led_get_diskio_activity();
474 /* blink all LEDs twice a second if we got an Oops (HPMC) */
475 if (unlikely(oops_in_progress))
476 currentleds = (count_HZ<=(HZ/2)) ? 0 : 0xff;
478 if (currentleds != lastleds)
480 led_func_ptr(currentleds); /* Update the LCD/LEDs */
481 lastleds = currentleds;
484 queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL);
488 ** led_halt()
490 ** called by the reboot notifier chain at shutdown and stops all
491 ** LED/LCD activities.
495 static int led_halt(struct notifier_block *, unsigned long, void *);
497 static struct notifier_block led_notifier = {
498 .notifier_call = led_halt,
500 static int notifier_disabled = 0;
502 static int led_halt(struct notifier_block *nb, unsigned long event, void *buf)
504 char *txt;
506 if (notifier_disabled)
507 return NOTIFY_OK;
509 notifier_disabled = 1;
510 switch (event) {
511 case SYS_RESTART: txt = "SYSTEM RESTART";
512 break;
513 case SYS_HALT: txt = "SYSTEM HALT";
514 break;
515 case SYS_POWER_OFF: txt = "SYSTEM POWER OFF";
516 break;
517 default: return NOTIFY_DONE;
520 /* Cancel the work item and delete the queue */
521 if (led_wq) {
522 cancel_rearming_delayed_workqueue(led_wq, &led_task);
523 destroy_workqueue(led_wq);
524 led_wq = NULL;
527 if (lcd_info.model == DISPLAY_MODEL_LCD)
528 lcd_print(txt);
529 else
530 if (led_func_ptr)
531 led_func_ptr(0xff); /* turn all LEDs ON */
533 return NOTIFY_OK;
537 ** register_led_driver()
539 ** registers an external LED or LCD for usage by this driver.
540 ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
544 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg)
546 static int initialized;
548 if (initialized || !data_reg)
549 return 1;
551 lcd_info.model = model; /* store the values */
552 LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg;
554 switch (lcd_info.model) {
555 case DISPLAY_MODEL_LCD:
556 LCD_DATA_REG = data_reg;
557 printk(KERN_INFO "LCD display at %lx,%lx registered\n",
558 LCD_CMD_REG , LCD_DATA_REG);
559 led_func_ptr = led_LCD_driver;
560 led_type = LED_HASLCD;
561 break;
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;
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;
578 default:
579 printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n",
580 __FUNCTION__, lcd_info.model);
581 return 1;
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);
589 /* Ensure the work is queued */
590 if (led_wq) {
591 queue_delayed_work(led_wq, &led_task, 0);
594 return 0;
598 ** register_led_regions()
600 ** register_led_regions() registers the LCD/LED regions for /procfs.
601 ** At bootup - where the initialisation of the LCD/LED normally happens -
602 ** not all internal structures of request_region() are properly set up,
603 ** so that we delay the led-registration until after busdevices_init()
604 ** has been executed.
608 void __init register_led_regions(void)
610 switch (lcd_info.model) {
611 case DISPLAY_MODEL_LCD:
612 request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd");
613 request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data");
614 break;
615 case DISPLAY_MODEL_LASI:
616 case DISPLAY_MODEL_OLD_ASP:
617 request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data");
618 break;
625 ** lcd_print()
627 ** Displays the given string on the LCD-Display of newer machines.
628 ** lcd_print() disables/enables the timer-based led work queue to
629 ** avoid a race condition while writing the CMD/DATA register pair.
632 int lcd_print( const char *str )
634 int i;
636 if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD)
637 return 0;
639 /* temporarily disable the led work task */
640 if (led_wq)
641 cancel_rearming_delayed_workqueue(led_wq, &led_task);
643 /* copy display string to buffer for procfs */
644 strlcpy(lcd_text, str, sizeof(lcd_text));
646 /* Set LCD Cursor to 1st character */
647 gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG);
648 udelay(lcd_info.min_cmd_delay);
650 /* Print the string */
651 for (i=0; i < lcd_info.lcd_width; i++) {
652 if (str && *str)
653 gsc_writeb(*str++, LCD_DATA_REG);
654 else
655 gsc_writeb(' ', LCD_DATA_REG);
656 udelay(lcd_info.min_cmd_delay);
659 /* re-queue the work */
660 if (led_wq) {
661 queue_delayed_work(led_wq, &led_task, 0);
664 return lcd_info.lcd_width;
668 ** led_init()
670 ** led_init() is called very early in the bootup-process from setup.c
671 ** and asks the PDC for an usable chassis LCD or LED.
672 ** If the PDC doesn't return any info, then the LED
673 ** is detected by lasi.c or asp.c and registered with the
674 ** above functions lasi_led_init() or asp_led_init().
675 ** KittyHawk machines have often a buggy PDC, so that
676 ** we explicitly check for those machines here.
679 int __init led_init(void)
681 struct pdc_chassis_info chassis_info;
682 int ret;
684 snprintf(lcd_text_default, sizeof(lcd_text_default),
685 "Linux %s", init_utsname()->release);
687 /* Work around the buggy PDC of KittyHawk-machines */
688 switch (CPU_HVERSION) {
689 case 0x580: /* KittyHawk DC2-100 (K100) */
690 case 0x581: /* KittyHawk DC3-120 (K210) */
691 case 0x582: /* KittyHawk DC3 100 (K400) */
692 case 0x583: /* KittyHawk DC3 120 (K410) */
693 case 0x58B: /* KittyHawk DC2 100 (K200) */
694 printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "
695 "LED detection skipped.\n", __FILE__, CPU_HVERSION);
696 goto found; /* use the preinitialized values of lcd_info */
699 /* initialize the struct, so that we can check for valid return values */
700 lcd_info.model = DISPLAY_MODEL_NONE;
701 chassis_info.actcnt = chassis_info.maxcnt = 0;
703 ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info));
704 if (ret == PDC_OK) {
705 DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), "
706 "lcd_width=%d, cmd_delay=%u,\n"
707 "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n",
708 __FILE__, lcd_info.model,
709 (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" :
710 (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown",
711 lcd_info.lcd_width, lcd_info.min_cmd_delay,
712 __FILE__, sizeof(lcd_info),
713 chassis_info.actcnt, chassis_info.maxcnt));
714 DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n",
715 __FILE__, lcd_info.lcd_cmd_reg_addr,
716 lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1,
717 lcd_info.reset_cmd2, lcd_info.act_enable ));
719 /* check the results. Some machines have a buggy PDC */
720 if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt)
721 goto not_found;
723 switch (lcd_info.model) {
724 case DISPLAY_MODEL_LCD: /* LCD display */
725 if (chassis_info.actcnt <
726 offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)
727 goto not_found;
728 if (!lcd_info.act_enable) {
729 DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n"));
730 goto not_found;
732 break;
734 case DISPLAY_MODEL_NONE: /* no LED or LCD available */
735 printk(KERN_INFO "PDC reported no LCD or LED.\n");
736 goto not_found;
738 case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */
739 if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32)
740 goto not_found;
741 break;
743 default:
744 printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n",
745 lcd_info.model);
746 goto not_found;
747 } /* switch() */
749 found:
750 /* register the LCD/LED driver */
751 register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG);
752 return 0;
754 } else { /* if() */
755 DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret));
758 not_found:
759 lcd_info.model = DISPLAY_MODEL_NONE;
760 return 1;
763 static void __exit led_exit(void)
765 unregister_reboot_notifier(&led_notifier);
766 return;
769 #ifdef CONFIG_PROC_FS
770 module_init(led_create_procfs)
771 #endif