Root/drivers/parisc/led.c

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
60static int led_type __read_mostly = -1;
61static unsigned char lastleds; /* LED state from most recent update */
62static unsigned int led_heartbeat __read_mostly = 1;
63static unsigned int led_diskio __read_mostly = 1;
64static unsigned int led_lanrxtx __read_mostly = 1;
65static char lcd_text[32] __read_mostly;
66static char lcd_text_default[32] __read_mostly;
67static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
68
69
70static struct workqueue_struct *led_wq;
71static void led_work_func(struct work_struct *);
72static 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
80struct 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 */
89struct 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. */
112static struct pdc_chassis_lcd_info_ret_block
113lcd_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 */
134static 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
149device_initcall(start_task);
150
151/* ptr to LCD/LED-specific function */
152static void (*led_func_ptr) (unsigned char) __read_mostly;
153
154#ifdef CONFIG_PROC_FS
155static 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
173static 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
179static 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
231parse_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
237static 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
246static 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 */
281static 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 */
301static 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 */
313static 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 */
352static __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 */
404static __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
440static 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
502static int led_halt(struct notifier_block *, unsigned long, void *);
503
504static struct notifier_block led_notifier = {
505    .notifier_call = led_halt,
506};
507static int notifier_disabled = 0;
508
509static 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
551int __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
615void __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 */
639int 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
686int __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
757found:
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
766not_found:
767    lcd_info.model = DISPLAY_MODEL_NONE;
768    return 1;
769}
770
771static void __exit led_exit(void)
772{
773    unregister_reboot_notifier(&led_notifier);
774    return;
775}
776
777#ifdef CONFIG_PROC_FS
778module_init(led_create_procfs)
779#endif
780

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