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19#include <linux/types.h>
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/module.h>
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched.h>
27#include <linux/smp_lock.h>
28#include <linux/adb.h>
29#include <linux/cuda.h>
30#include <linux/pmu.h>
31#include <linux/notifier.h>
32#include <linux/wait.h>
33#include <linux/init.h>
34#include <linux/delay.h>
35#include <linux/spinlock.h>
36#include <linux/completion.h>
37#include <linux/device.h>
38#include <linux/kthread.h>
39#include <linux/platform_device.h>
40#include <linux/mutex.h>
41
42#include <asm/uaccess.h>
43#ifdef CONFIG_PPC
44#include <asm/prom.h>
45#include <asm/machdep.h>
46#endif
47
48
49EXPORT_SYMBOL(adb_client_list);
50
51extern struct adb_driver via_macii_driver;
52extern struct adb_driver via_maciisi_driver;
53extern struct adb_driver via_cuda_driver;
54extern struct adb_driver adb_iop_driver;
55extern struct adb_driver via_pmu_driver;
56extern struct adb_driver macio_adb_driver;
57
58static struct adb_driver *adb_driver_list[] = {
59#ifdef CONFIG_ADB_MACII
60 &via_macii_driver,
61#endif
62#ifdef CONFIG_ADB_MACIISI
63 &via_maciisi_driver,
64#endif
65#ifdef CONFIG_ADB_CUDA
66 &via_cuda_driver,
67#endif
68#ifdef CONFIG_ADB_IOP
69 &adb_iop_driver,
70#endif
71#if defined(CONFIG_ADB_PMU) || defined(CONFIG_ADB_PMU68K)
72 &via_pmu_driver,
73#endif
74#ifdef CONFIG_ADB_MACIO
75 &macio_adb_driver,
76#endif
77 NULL
78};
79
80static struct class *adb_dev_class;
81
82static struct adb_driver *adb_controller;
83BLOCKING_NOTIFIER_HEAD(adb_client_list);
84static int adb_got_sleep;
85static int adb_inited;
86static DECLARE_MUTEX(adb_probe_mutex);
87static int sleepy_trackpad;
88static int autopoll_devs;
89int __adb_probe_sync;
90
91static int adb_scan_bus(void);
92static int do_adb_reset_bus(void);
93static void adbdev_init(void);
94static int try_handler_change(int, int);
95
96static struct adb_handler {
97 void (*handler)(unsigned char *, int, int);
98 int original_address;
99 int handler_id;
100 int busy;
101} adb_handler[16];
102
103
104
105
106
107
108
109
110
111
112static DEFINE_MUTEX(adb_handler_mutex);
113static DEFINE_RWLOCK(adb_handler_lock);
114
115#if 0
116static void printADBreply(struct adb_request *req)
117{
118 int i;
119
120 printk("adb reply (%d)", req->reply_len);
121 for(i = 0; i < req->reply_len; i++)
122 printk(" %x", req->reply[i]);
123 printk("\n");
124
125}
126#endif
127
128static int adb_scan_bus(void)
129{
130 int i, highFree=0, noMovement;
131 int devmask = 0;
132 struct adb_request req;
133
134
135 for (i = 1; i < 16; i++) {
136
137 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
138 (i << 4) | 0xf);
139 if (req.reply_len > 1)
140
141 adb_handler[i].original_address = i;
142 else if (i > highFree)
143 highFree = i;
144 }
145
146
147 for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) {
148 for (i = 1; i < 16; i++) {
149 if (adb_handler[i].original_address == 0)
150 continue;
151
152
153
154
155
156 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
157 (i << 4) | 0xf);
158
159
160
161
162
163 adb_request(&req, NULL, ADBREQ_SYNC, 3,
164 (i<< 4) | 0xb, (highFree | 0x60), 0xfe);
165
166
167
168
169
170
171 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
172 (highFree << 4) | 0xf);
173 if (req.reply_len <= 1) continue;
174
175
176
177
178 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
179 (i << 4) | 0xf);
180 if (req.reply_len > 1) {
181
182
183
184
185
186
187 adb_handler[highFree].original_address =
188 adb_handler[i].original_address;
189 while (highFree > 0 &&
190 adb_handler[highFree].original_address)
191 highFree--;
192 if (highFree <= 0)
193 break;
194
195 noMovement = 0;
196 }
197 else {
198
199
200
201
202 adb_request(&req, NULL, ADBREQ_SYNC, 3,
203 (highFree << 4) | 0xb,
204 (i | 0x60), 0xfe);
205 }
206 }
207 }
208
209
210 printk(KERN_DEBUG "adb devices:");
211 for (i = 1; i < 16; i++) {
212 if (adb_handler[i].original_address == 0)
213 continue;
214 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
215 (i << 4) | 0xf);
216 adb_handler[i].handler_id = req.reply[2];
217 printk(" [%d]: %d %x", i, adb_handler[i].original_address,
218 adb_handler[i].handler_id);
219 devmask |= 1 << i;
220 }
221 printk("\n");
222 return devmask;
223}
224
225
226
227
228
229static int
230adb_probe_task(void *x)
231{
232 printk(KERN_INFO "adb: starting probe task...\n");
233 do_adb_reset_bus();
234 printk(KERN_INFO "adb: finished probe task...\n");
235
236 up(&adb_probe_mutex);
237
238 return 0;
239}
240
241static void
242__adb_probe_task(struct work_struct *bullshit)
243{
244 kthread_run(adb_probe_task, NULL, "kadbprobe");
245}
246
247static DECLARE_WORK(adb_reset_work, __adb_probe_task);
248
249int
250adb_reset_bus(void)
251{
252 if (__adb_probe_sync) {
253 do_adb_reset_bus();
254 return 0;
255 }
256
257 down(&adb_probe_mutex);
258 schedule_work(&adb_reset_work);
259 return 0;
260}
261
262#ifdef CONFIG_PM
263
264
265
266static int adb_suspend(struct platform_device *dev, pm_message_t state)
267{
268 adb_got_sleep = 1;
269
270 down(&adb_probe_mutex);
271
272 if (adb_controller->autopoll)
273 adb_controller->autopoll(0);
274 blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL);
275
276 return 0;
277}
278
279
280
281
282static int adb_resume(struct platform_device *dev)
283{
284 adb_got_sleep = 0;
285 up(&adb_probe_mutex);
286 adb_reset_bus();
287
288 return 0;
289}
290#endif
291
292static int __init adb_init(void)
293{
294 struct adb_driver *driver;
295 int i;
296
297#ifdef CONFIG_PPC32
298 if (!machine_is(chrp) && !machine_is(powermac))
299 return 0;
300#endif
301#ifdef CONFIG_MAC
302 if (!MACH_IS_MAC)
303 return 0;
304#endif
305
306
307 if (adb_inited)
308 return 0;
309 adb_inited = 1;
310
311 adb_controller = NULL;
312
313 i = 0;
314 while ((driver = adb_driver_list[i++]) != NULL) {
315 if (!driver->probe()) {
316 adb_controller = driver;
317 break;
318 }
319 }
320 if ((adb_controller == NULL) || adb_controller->init()) {
321 printk(KERN_WARNING "Warning: no ADB interface detected\n");
322 adb_controller = NULL;
323 } else {
324#ifdef CONFIG_PPC
325 if (machine_is_compatible("AAPL,PowerBook1998") ||
326 machine_is_compatible("PowerBook1,1"))
327 sleepy_trackpad = 1;
328#endif
329
330 adbdev_init();
331 adb_reset_bus();
332 }
333 return 0;
334}
335
336device_initcall(adb_init);
337
338static int
339do_adb_reset_bus(void)
340{
341 int ret;
342
343 if (adb_controller == NULL)
344 return -ENXIO;
345
346 if (adb_controller->autopoll)
347 adb_controller->autopoll(0);
348
349 blocking_notifier_call_chain(&adb_client_list,
350 ADB_MSG_PRE_RESET, NULL);
351
352 if (sleepy_trackpad) {
353
354 msleep(500);
355 }
356
357 mutex_lock(&adb_handler_mutex);
358 write_lock_irq(&adb_handler_lock);
359 memset(adb_handler, 0, sizeof(adb_handler));
360 write_unlock_irq(&adb_handler_lock);
361
362
363 if (adb_controller->reset_bus)
364 ret = adb_controller->reset_bus();
365 else
366 ret = 0;
367
368 if (sleepy_trackpad) {
369
370 msleep(1500);
371 }
372
373 if (!ret) {
374 autopoll_devs = adb_scan_bus();
375 if (adb_controller->autopoll)
376 adb_controller->autopoll(autopoll_devs);
377 }
378 mutex_unlock(&adb_handler_mutex);
379
380 blocking_notifier_call_chain(&adb_client_list,
381 ADB_MSG_POST_RESET, NULL);
382
383 return ret;
384}
385
386void
387adb_poll(void)
388{
389 if ((adb_controller == NULL)||(adb_controller->poll == NULL))
390 return;
391 adb_controller->poll();
392}
393
394static void adb_sync_req_done(struct adb_request *req)
395{
396 struct completion *comp = req->arg;
397
398 complete(comp);
399}
400
401int
402adb_request(struct adb_request *req, void (*done)(struct adb_request *),
403 int flags, int nbytes, ...)
404{
405 va_list list;
406 int i;
407 int rc;
408 struct completion comp;
409
410 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
411 return -ENXIO;
412 if (nbytes < 1)
413 return -EINVAL;
414
415 req->nbytes = nbytes+1;
416 req->done = done;
417 req->reply_expected = flags & ADBREQ_REPLY;
418 req->data[0] = ADB_PACKET;
419 va_start(list, nbytes);
420 for (i = 0; i < nbytes; ++i)
421 req->data[i+1] = va_arg(list, int);
422 va_end(list);
423
424 if (flags & ADBREQ_NOSEND)
425 return 0;
426
427
428 if (flags & ADBREQ_SYNC) {
429 WARN_ON(done);
430 req->done = adb_sync_req_done;
431 req->arg = ∁
432 init_completion(&comp);
433 }
434
435 rc = adb_controller->send_request(req, 0);
436
437 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
438 wait_for_completion(&comp);
439
440 return rc;
441}
442
443
444
445
446
447
448
449
450int
451adb_register(int default_id, int handler_id, struct adb_ids *ids,
452 void (*handler)(unsigned char *, int, int))
453{
454 int i;
455
456 mutex_lock(&adb_handler_mutex);
457 ids->nids = 0;
458 for (i = 1; i < 16; i++) {
459 if ((adb_handler[i].original_address == default_id) &&
460 (!handler_id || (handler_id == adb_handler[i].handler_id) ||
461 try_handler_change(i, handler_id))) {
462 if (adb_handler[i].handler != 0) {
463 printk(KERN_ERR
464 "Two handlers for ADB device %d\n",
465 default_id);
466 continue;
467 }
468 write_lock_irq(&adb_handler_lock);
469 adb_handler[i].handler = handler;
470 write_unlock_irq(&adb_handler_lock);
471 ids->id[ids->nids++] = i;
472 }
473 }
474 mutex_unlock(&adb_handler_mutex);
475 return ids->nids;
476}
477
478int
479adb_unregister(int index)
480{
481 int ret = -ENODEV;
482
483 mutex_lock(&adb_handler_mutex);
484 write_lock_irq(&adb_handler_lock);
485 if (adb_handler[index].handler) {
486 while(adb_handler[index].busy) {
487 write_unlock_irq(&adb_handler_lock);
488 yield();
489 write_lock_irq(&adb_handler_lock);
490 }
491 ret = 0;
492 adb_handler[index].handler = NULL;
493 }
494 write_unlock_irq(&adb_handler_lock);
495 mutex_unlock(&adb_handler_mutex);
496 return ret;
497}
498
499void
500adb_input(unsigned char *buf, int nb, int autopoll)
501{
502 int i, id;
503 static int dump_adb_input = 0;
504 unsigned long flags;
505
506 void (*handler)(unsigned char *, int, int);
507
508
509
510
511 if (adb_got_sleep)
512 return;
513
514 id = buf[0] >> 4;
515 if (dump_adb_input) {
516 printk(KERN_INFO "adb packet: ");
517 for (i = 0; i < nb; ++i)
518 printk(" %x", buf[i]);
519 printk(", id = %d\n", id);
520 }
521 write_lock_irqsave(&adb_handler_lock, flags);
522 handler = adb_handler[id].handler;
523 if (handler != NULL)
524 adb_handler[id].busy = 1;
525 write_unlock_irqrestore(&adb_handler_lock, flags);
526 if (handler != NULL) {
527 (*handler)(buf, nb, autopoll);
528 wmb();
529 adb_handler[id].busy = 0;
530 }
531
532}
533
534
535static int try_handler_change(int address, int new_id)
536{
537 struct adb_request req;
538
539 if (adb_handler[address].handler_id == new_id)
540 return 1;
541 adb_request(&req, NULL, ADBREQ_SYNC, 3,
542 ADB_WRITEREG(address, 3), address | 0x20, new_id);
543 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
544 ADB_READREG(address, 3));
545 if (req.reply_len < 2)
546 return 0;
547 if (req.reply[2] != new_id)
548 return 0;
549 adb_handler[address].handler_id = req.reply[2];
550
551 return 1;
552}
553
554int
555adb_try_handler_change(int address, int new_id)
556{
557 int ret;
558
559 mutex_lock(&adb_handler_mutex);
560 ret = try_handler_change(address, new_id);
561 mutex_unlock(&adb_handler_mutex);
562 return ret;
563}
564
565int
566adb_get_infos(int address, int *original_address, int *handler_id)
567{
568 mutex_lock(&adb_handler_mutex);
569 *original_address = adb_handler[address].original_address;
570 *handler_id = adb_handler[address].handler_id;
571 mutex_unlock(&adb_handler_mutex);
572
573 return (*original_address != 0);
574}
575
576
577
578
579
580
581#define ADB_MAJOR 56
582
583struct adbdev_state {
584 spinlock_t lock;
585 atomic_t n_pending;
586 struct adb_request *completed;
587 wait_queue_head_t wait_queue;
588 int inuse;
589};
590
591static void adb_write_done(struct adb_request *req)
592{
593 struct adbdev_state *state = (struct adbdev_state *) req->arg;
594 unsigned long flags;
595
596 if (!req->complete) {
597 req->reply_len = 0;
598 req->complete = 1;
599 }
600 spin_lock_irqsave(&state->lock, flags);
601 atomic_dec(&state->n_pending);
602 if (!state->inuse) {
603 kfree(req);
604 if (atomic_read(&state->n_pending) == 0) {
605 spin_unlock_irqrestore(&state->lock, flags);
606 kfree(state);
607 return;
608 }
609 } else {
610 struct adb_request **ap = &state->completed;
611 while (*ap != NULL)
612 ap = &(*ap)->next;
613 req->next = NULL;
614 *ap = req;
615 wake_up_interruptible(&state->wait_queue);
616 }
617 spin_unlock_irqrestore(&state->lock, flags);
618}
619
620static int
621do_adb_query(struct adb_request *req)
622{
623 int ret = -EINVAL;
624
625 switch(req->data[1])
626 {
627 case ADB_QUERY_GETDEVINFO:
628 if (req->nbytes < 3)
629 break;
630 mutex_lock(&adb_handler_mutex);
631 req->reply[0] = adb_handler[req->data[2]].original_address;
632 req->reply[1] = adb_handler[req->data[2]].handler_id;
633 mutex_unlock(&adb_handler_mutex);
634 req->complete = 1;
635 req->reply_len = 2;
636 adb_write_done(req);
637 ret = 0;
638 break;
639 }
640 return ret;
641}
642
643static int adb_open(struct inode *inode, struct file *file)
644{
645 struct adbdev_state *state;
646 int ret = 0;
647
648 lock_kernel();
649 if (iminor(inode) > 0 || adb_controller == NULL) {
650 ret = -ENXIO;
651 goto out;
652 }
653 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
654 if (state == 0) {
655 ret = -ENOMEM;
656 goto out;
657 }
658 file->private_data = state;
659 spin_lock_init(&state->lock);
660 atomic_set(&state->n_pending, 0);
661 state->completed = NULL;
662 init_waitqueue_head(&state->wait_queue);
663 state->inuse = 1;
664
665out:
666 unlock_kernel();
667 return ret;
668}
669
670static int adb_release(struct inode *inode, struct file *file)
671{
672 struct adbdev_state *state = file->private_data;
673 unsigned long flags;
674
675 lock_kernel();
676 if (state) {
677 file->private_data = NULL;
678 spin_lock_irqsave(&state->lock, flags);
679 if (atomic_read(&state->n_pending) == 0
680 && state->completed == NULL) {
681 spin_unlock_irqrestore(&state->lock, flags);
682 kfree(state);
683 } else {
684 state->inuse = 0;
685 spin_unlock_irqrestore(&state->lock, flags);
686 }
687 }
688 unlock_kernel();
689 return 0;
690}
691
692static ssize_t adb_read(struct file *file, char __user *buf,
693 size_t count, loff_t *ppos)
694{
695 int ret = 0;
696 struct adbdev_state *state = file->private_data;
697 struct adb_request *req;
698 wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current);
699 unsigned long flags;
700
701 if (count < 2)
702 return -EINVAL;
703 if (count > sizeof(req->reply))
704 count = sizeof(req->reply);
705 if (!access_ok(VERIFY_WRITE, buf, count))
706 return -EFAULT;
707
708 req = NULL;
709 spin_lock_irqsave(&state->lock, flags);
710 add_wait_queue(&state->wait_queue, &wait);
711 current->state = TASK_INTERRUPTIBLE;
712
713 for (;;) {
714 req = state->completed;
715 if (req != NULL)
716 state->completed = req->next;
717 else if (atomic_read(&state->n_pending) == 0)
718 ret = -EIO;
719 if (req != NULL || ret != 0)
720 break;
721
722 if (file->f_flags & O_NONBLOCK) {
723 ret = -EAGAIN;
724 break;
725 }
726 if (signal_pending(current)) {
727 ret = -ERESTARTSYS;
728 break;
729 }
730 spin_unlock_irqrestore(&state->lock, flags);
731 schedule();
732 spin_lock_irqsave(&state->lock, flags);
733 }
734
735 current->state = TASK_RUNNING;
736 remove_wait_queue(&state->wait_queue, &wait);
737 spin_unlock_irqrestore(&state->lock, flags);
738
739 if (ret)
740 return ret;
741
742 ret = req->reply_len;
743 if (ret > count)
744 ret = count;
745 if (ret > 0 && copy_to_user(buf, req->reply, ret))
746 ret = -EFAULT;
747
748 kfree(req);
749 return ret;
750}
751
752static ssize_t adb_write(struct file *file, const char __user *buf,
753 size_t count, loff_t *ppos)
754{
755 int ret;
756 struct adbdev_state *state = file->private_data;
757 struct adb_request *req;
758
759 if (count < 2 || count > sizeof(req->data))
760 return -EINVAL;
761 if (adb_controller == NULL)
762 return -ENXIO;
763 if (!access_ok(VERIFY_READ, buf, count))
764 return -EFAULT;
765
766 req = kmalloc(sizeof(struct adb_request),
767 GFP_KERNEL);
768 if (req == NULL)
769 return -ENOMEM;
770
771 req->nbytes = count;
772 req->done = adb_write_done;
773 req->arg = (void *) state;
774 req->complete = 0;
775
776 ret = -EFAULT;
777 if (copy_from_user(req->data, buf, count))
778 goto out;
779
780 atomic_inc(&state->n_pending);
781
782
783 down(&adb_probe_mutex);
784
785
786 if (req->data[0] == ADB_QUERY) {
787 if (count > 1)
788 ret = do_adb_query(req);
789 else
790 ret = -EINVAL;
791 up(&adb_probe_mutex);
792 }
793
794
795 else if ((req->data[0] == ADB_PACKET)&&(count > 1)
796 &&(req->data[1] == ADB_BUSRESET)) {
797 ret = do_adb_reset_bus();
798 up(&adb_probe_mutex);
799 atomic_dec(&state->n_pending);
800 if (ret == 0)
801 ret = count;
802 goto out;
803 } else {
804 req->reply_expected = ((req->data[1] & 0xc) == 0xc);
805 if (adb_controller && adb_controller->send_request)
806 ret = adb_controller->send_request(req, 0);
807 else
808 ret = -ENXIO;
809 up(&adb_probe_mutex);
810 }
811
812 if (ret != 0) {
813 atomic_dec(&state->n_pending);
814 goto out;
815 }
816 return count;
817
818out:
819 kfree(req);
820 return ret;
821}
822
823static const struct file_operations adb_fops = {
824 .owner = THIS_MODULE,
825 .llseek = no_llseek,
826 .read = adb_read,
827 .write = adb_write,
828 .open = adb_open,
829 .release = adb_release,
830};
831
832static struct platform_driver adb_pfdrv = {
833 .driver = {
834 .name = "adb",
835 },
836#ifdef CONFIG_PM
837 .suspend = adb_suspend,
838 .resume = adb_resume,
839#endif
840};
841
842static struct platform_device adb_pfdev = {
843 .name = "adb",
844};
845
846static int __init
847adb_dummy_probe(struct platform_device *dev)
848{
849 if (dev == &adb_pfdev)
850 return 0;
851 return -ENODEV;
852}
853
854static void __init
855adbdev_init(void)
856{
857 if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) {
858 printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR);
859 return;
860 }
861
862 adb_dev_class = class_create(THIS_MODULE, "adb");
863 if (IS_ERR(adb_dev_class))
864 return;
865 device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
866
867 platform_device_register(&adb_pfdev);
868 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
869}
870