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1/*
2 * Device driver for the Apple Desktop Bus
3 * and the /dev/adb device on macintoshes.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 *
7 * Modified to declare controllers as structures, added
8 * client notification of bus reset and handles PowerBook
9 * sleep, by Benjamin Herrenschmidt.
10 *
11 * To do:
12 *
13 * - /sys/bus/adb to list the devices and infos
14 * - more /dev/adb to allow userland to receive the
15 * flow of auto-polling datas from a given device.
16 * - move bus probe to a kernel thread
17 */
18
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/adb.h>
28#include <linux/cuda.h>
29#include <linux/pmu.h>
30#include <linux/notifier.h>
31#include <linux/wait.h>
32#include <linux/init.h>
33#include <linux/delay.h>
34#include <linux/spinlock.h>
35#include <linux/completion.h>
36#include <linux/device.h>
37#include <linux/kthread.h>
38#include <linux/platform_device.h>
39#include <linux/mutex.h>
40
41#include <asm/uaccess.h>
42#ifdef CONFIG_PPC
43#include <asm/prom.h>
44#include <asm/machdep.h>
45#endif
46
47
48EXPORT_SYMBOL(adb_client_list);
49
50extern struct adb_driver via_macii_driver;
51extern struct adb_driver via_maciisi_driver;
52extern struct adb_driver via_cuda_driver;
53extern struct adb_driver adb_iop_driver;
54extern struct adb_driver via_pmu_driver;
55extern struct adb_driver macio_adb_driver;
56
57static DEFINE_MUTEX(adb_mutex);
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 DEFINE_SEMAPHORE(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 * The adb_handler_mutex mutex protects all accesses to the original_address
105 * and handler_id fields of adb_handler[i] for all i, and changes to the
106 * handler field.
107 * Accesses to the handler field are protected by the adb_handler_lock
108 * rwlock. It is held across all calls to any handler, so that by the
109 * time adb_unregister returns, we know that the old handler isn't being
110 * called.
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 /* assumes adb_handler[] is all zeroes at this point */
135 for (i = 1; i < 16; i++) {
136 /* see if there is anything at address i */
137 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
138 (i << 4) | 0xf);
139 if (req.reply_len > 1)
140 /* one or more devices at this address */
141 adb_handler[i].original_address = i;
142 else if (i > highFree)
143 highFree = i;
144 }
145
146 /* Note we reset noMovement to 0 each time we move a device */
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 * Send a "talk register 3" command to address i
153 * to provoke a collision if there is more than
154 * one device at this address.
155 */
156 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
157 (i << 4) | 0xf);
158 /*
159 * Move the device(s) which didn't detect a
160 * collision to address `highFree'. Hopefully
161 * this only moves one device.
162 */
163 adb_request(&req, NULL, ADBREQ_SYNC, 3,
164 (i<< 4) | 0xb, (highFree | 0x60), 0xfe);
165 /*
166 * See if anybody actually moved. This is suggested
167 * by HW TechNote 01:
168 *
169 * http://developer.apple.com/technotes/hw/hw_01.html
170 */
171 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
172 (highFree << 4) | 0xf);
173 if (req.reply_len <= 1) continue;
174 /*
175 * Test whether there are any device(s) left
176 * at address i.
177 */
178 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
179 (i << 4) | 0xf);
180 if (req.reply_len > 1) {
181 /*
182 * There are still one or more devices
183 * left at address i. Register the one(s)
184 * we moved to `highFree', and find a new
185 * value for highFree.
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 * No devices left at address i; move the
200 * one(s) we moved to `highFree' back to i.
201 */
202 adb_request(&req, NULL, ADBREQ_SYNC, 3,
203 (highFree << 4) | 0xb,
204 (i | 0x60), 0xfe);
205 }
206 }
207 }
208
209 /* Now fill in the handler_id field of the adb_handler entries. */
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 * This kernel task handles ADB probing. It dies once probing is
227 * completed.
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 * notify clients before sleep
265 */
266static int adb_suspend(struct platform_device *dev, pm_message_t state)
267{
268 adb_got_sleep = 1;
269 /* We need to get a lock on the probe thread */
270 down(&adb_probe_mutex);
271 /* Stop autopoll */
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 * reset bus after sleep
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 /* CONFIG_PM */
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 /* xmon may do early-init */
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 adb_controller->init())
322 adb_controller = NULL;
323 if (adb_controller == NULL) {
324 printk(KERN_WARNING "Warning: no ADB interface detected\n");
325 } else {
326#ifdef CONFIG_PPC
327 if (of_machine_is_compatible("AAPL,PowerBook1998") ||
328 of_machine_is_compatible("PowerBook1,1"))
329 sleepy_trackpad = 1;
330#endif /* CONFIG_PPC */
331
332 adbdev_init();
333 adb_reset_bus();
334 }
335 return 0;
336}
337
338device_initcall(adb_init);
339
340static int
341do_adb_reset_bus(void)
342{
343 int ret;
344
345 if (adb_controller == NULL)
346 return -ENXIO;
347
348 if (adb_controller->autopoll)
349 adb_controller->autopoll(0);
350
351 blocking_notifier_call_chain(&adb_client_list,
352 ADB_MSG_PRE_RESET, NULL);
353
354 if (sleepy_trackpad) {
355 /* Let the trackpad settle down */
356 msleep(500);
357 }
358
359 mutex_lock(&adb_handler_mutex);
360 write_lock_irq(&adb_handler_lock);
361 memset(adb_handler, 0, sizeof(adb_handler));
362 write_unlock_irq(&adb_handler_lock);
363
364 /* That one is still a bit synchronous, oh well... */
365 if (adb_controller->reset_bus)
366 ret = adb_controller->reset_bus();
367 else
368 ret = 0;
369
370 if (sleepy_trackpad) {
371 /* Let the trackpad settle down */
372 msleep(1500);
373 }
374
375 if (!ret) {
376 autopoll_devs = adb_scan_bus();
377 if (adb_controller->autopoll)
378 adb_controller->autopoll(autopoll_devs);
379 }
380 mutex_unlock(&adb_handler_mutex);
381
382 blocking_notifier_call_chain(&adb_client_list,
383 ADB_MSG_POST_RESET, NULL);
384
385 return ret;
386}
387
388void
389adb_poll(void)
390{
391 if ((adb_controller == NULL)||(adb_controller->poll == NULL))
392 return;
393 adb_controller->poll();
394}
395
396static void adb_sync_req_done(struct adb_request *req)
397{
398 struct completion *comp = req->arg;
399
400 complete(comp);
401}
402
403int
404adb_request(struct adb_request *req, void (*done)(struct adb_request *),
405 int flags, int nbytes, ...)
406{
407 va_list list;
408 int i;
409 int rc;
410 struct completion comp;
411
412 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
413 return -ENXIO;
414 if (nbytes < 1)
415 return -EINVAL;
416
417 req->nbytes = nbytes+1;
418 req->done = done;
419 req->reply_expected = flags & ADBREQ_REPLY;
420 req->data[0] = ADB_PACKET;
421 va_start(list, nbytes);
422 for (i = 0; i < nbytes; ++i)
423 req->data[i+1] = va_arg(list, int);
424 va_end(list);
425
426 if (flags & ADBREQ_NOSEND)
427 return 0;
428
429 /* Synchronous requests block using an on-stack completion */
430 if (flags & ADBREQ_SYNC) {
431 WARN_ON(done);
432 req->done = adb_sync_req_done;
433 req->arg = ∁
434 init_completion(&comp);
435 }
436
437 rc = adb_controller->send_request(req, 0);
438
439 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
440 wait_for_completion(&comp);
441
442 return rc;
443}
444
445 /* Ultimately this should return the number of devices with
446 the given default id.
447 And it does it now ! Note: changed behaviour: This function
448 will now register if default_id _and_ handler_id both match
449 but handler_id can be left to 0 to match with default_id only.
450 When handler_id is set, this function will try to adjust
451 the handler_id id it doesn't match. */
452int
453adb_register(int default_id, int handler_id, struct adb_ids *ids,
454 void (*handler)(unsigned char *, int, int))
455{
456 int i;
457
458 mutex_lock(&adb_handler_mutex);
459 ids->nids = 0;
460 for (i = 1; i < 16; i++) {
461 if ((adb_handler[i].original_address == default_id) &&
462 (!handler_id || (handler_id == adb_handler[i].handler_id) ||
463 try_handler_change(i, handler_id))) {
464 if (adb_handler[i].handler != 0) {
465 printk(KERN_ERR
466 "Two handlers for ADB device %d\n",
467 default_id);
468 continue;
469 }
470 write_lock_irq(&adb_handler_lock);
471 adb_handler[i].handler = handler;
472 write_unlock_irq(&adb_handler_lock);
473 ids->id[ids->nids++] = i;
474 }
475 }
476 mutex_unlock(&adb_handler_mutex);
477 return ids->nids;
478}
479
480int
481adb_unregister(int index)
482{
483 int ret = -ENODEV;
484
485 mutex_lock(&adb_handler_mutex);
486 write_lock_irq(&adb_handler_lock);
487 if (adb_handler[index].handler) {
488 while(adb_handler[index].busy) {
489 write_unlock_irq(&adb_handler_lock);
490 yield();
491 write_lock_irq(&adb_handler_lock);
492 }
493 ret = 0;
494 adb_handler[index].handler = NULL;
495 }
496 write_unlock_irq(&adb_handler_lock);
497 mutex_unlock(&adb_handler_mutex);
498 return ret;
499}
500
501void
502adb_input(unsigned char *buf, int nb, int autopoll)
503{
504 int i, id;
505 static int dump_adb_input = 0;
506 unsigned long flags;
507
508 void (*handler)(unsigned char *, int, int);
509
510 /* We skip keystrokes and mouse moves when the sleep process
511 * has been started. We stop autopoll, but this is another security
512 */
513 if (adb_got_sleep)
514 return;
515
516 id = buf[0] >> 4;
517 if (dump_adb_input) {
518 printk(KERN_INFO "adb packet: ");
519 for (i = 0; i < nb; ++i)
520 printk(" %x", buf[i]);
521 printk(", id = %d\n", id);
522 }
523 write_lock_irqsave(&adb_handler_lock, flags);
524 handler = adb_handler[id].handler;
525 if (handler != NULL)
526 adb_handler[id].busy = 1;
527 write_unlock_irqrestore(&adb_handler_lock, flags);
528 if (handler != NULL) {
529 (*handler)(buf, nb, autopoll);
530 wmb();
531 adb_handler[id].busy = 0;
532 }
533
534}
535
536/* Try to change handler to new_id. Will return 1 if successful. */
537static int try_handler_change(int address, int new_id)
538{
539 struct adb_request req;
540
541 if (adb_handler[address].handler_id == new_id)
542 return 1;
543 adb_request(&req, NULL, ADBREQ_SYNC, 3,
544 ADB_WRITEREG(address, 3), address | 0x20, new_id);
545 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
546 ADB_READREG(address, 3));
547 if (req.reply_len < 2)
548 return 0;
549 if (req.reply[2] != new_id)
550 return 0;
551 adb_handler[address].handler_id = req.reply[2];
552
553 return 1;
554}
555
556int
557adb_try_handler_change(int address, int new_id)
558{
559 int ret;
560
561 mutex_lock(&adb_handler_mutex);
562 ret = try_handler_change(address, new_id);
563 mutex_unlock(&adb_handler_mutex);
564 return ret;
565}
566
567int
568adb_get_infos(int address, int *original_address, int *handler_id)
569{
570 mutex_lock(&adb_handler_mutex);
571 *original_address = adb_handler[address].original_address;
572 *handler_id = adb_handler[address].handler_id;
573 mutex_unlock(&adb_handler_mutex);
574
575 return (*original_address != 0);
576}
577
578
579/*
580 * /dev/adb device driver.
581 */
582
583#define ADB_MAJOR 56 /* major number for /dev/adb */
584
585struct adbdev_state {
586 spinlock_t lock;
587 atomic_t n_pending;
588 struct adb_request *completed;
589 wait_queue_head_t wait_queue;
590 int inuse;
591};
592
593static void adb_write_done(struct adb_request *req)
594{
595 struct adbdev_state *state = (struct adbdev_state *) req->arg;
596 unsigned long flags;
597
598 if (!req->complete) {
599 req->reply_len = 0;
600 req->complete = 1;
601 }
602 spin_lock_irqsave(&state->lock, flags);
603 atomic_dec(&state->n_pending);
604 if (!state->inuse) {
605 kfree(req);
606 if (atomic_read(&state->n_pending) == 0) {
607 spin_unlock_irqrestore(&state->lock, flags);
608 kfree(state);
609 return;
610 }
611 } else {
612 struct adb_request **ap = &state->completed;
613 while (*ap != NULL)
614 ap = &(*ap)->next;
615 req->next = NULL;
616 *ap = req;
617 wake_up_interruptible(&state->wait_queue);
618 }
619 spin_unlock_irqrestore(&state->lock, flags);
620}
621
622static int
623do_adb_query(struct adb_request *req)
624{
625 int ret = -EINVAL;
626
627 switch(req->data[1])
628 {
629 case ADB_QUERY_GETDEVINFO:
630 if (req->nbytes < 3)
631 break;
632 mutex_lock(&adb_handler_mutex);
633 req->reply[0] = adb_handler[req->data[2]].original_address;
634 req->reply[1] = adb_handler[req->data[2]].handler_id;
635 mutex_unlock(&adb_handler_mutex);
636 req->complete = 1;
637 req->reply_len = 2;
638 adb_write_done(req);
639 ret = 0;
640 break;
641 }
642 return ret;
643}
644
645static int adb_open(struct inode *inode, struct file *file)
646{
647 struct adbdev_state *state;
648 int ret = 0;
649
650 mutex_lock(&adb_mutex);
651 if (iminor(inode) > 0 || adb_controller == NULL) {
652 ret = -ENXIO;
653 goto out;
654 }
655 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
656 if (state == 0) {
657 ret = -ENOMEM;
658 goto out;
659 }
660 file->private_data = state;
661 spin_lock_init(&state->lock);
662 atomic_set(&state->n_pending, 0);
663 state->completed = NULL;
664 init_waitqueue_head(&state->wait_queue);
665 state->inuse = 1;
666
667out:
668 mutex_unlock(&adb_mutex);
669 return ret;
670}
671
672static int adb_release(struct inode *inode, struct file *file)
673{
674 struct adbdev_state *state = file->private_data;
675 unsigned long flags;
676
677 mutex_lock(&adb_mutex);
678 if (state) {
679 file->private_data = NULL;
680 spin_lock_irqsave(&state->lock, flags);
681 if (atomic_read(&state->n_pending) == 0
682 && state->completed == NULL) {
683 spin_unlock_irqrestore(&state->lock, flags);
684 kfree(state);
685 } else {
686 state->inuse = 0;
687 spin_unlock_irqrestore(&state->lock, flags);
688 }
689 }
690 mutex_unlock(&adb_mutex);
691 return 0;
692}
693
694static ssize_t adb_read(struct file *file, char __user *buf,
695 size_t count, loff_t *ppos)
696{
697 int ret = 0;
698 struct adbdev_state *state = file->private_data;
699 struct adb_request *req;
700 wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current);
701 unsigned long flags;
702
703 if (count < 2)
704 return -EINVAL;
705 if (count > sizeof(req->reply))
706 count = sizeof(req->reply);
707 if (!access_ok(VERIFY_WRITE, buf, count))
708 return -EFAULT;
709
710 req = NULL;
711 spin_lock_irqsave(&state->lock, flags);
712 add_wait_queue(&state->wait_queue, &wait);
713 current->state = TASK_INTERRUPTIBLE;
714
715 for (;;) {
716 req = state->completed;
717 if (req != NULL)
718 state->completed = req->next;
719 else if (atomic_read(&state->n_pending) == 0)
720 ret = -EIO;
721 if (req != NULL || ret != 0)
722 break;
723
724 if (file->f_flags & O_NONBLOCK) {
725 ret = -EAGAIN;
726 break;
727 }
728 if (signal_pending(current)) {
729 ret = -ERESTARTSYS;
730 break;
731 }
732 spin_unlock_irqrestore(&state->lock, flags);
733 schedule();
734 spin_lock_irqsave(&state->lock, flags);
735 }
736
737 current->state = TASK_RUNNING;
738 remove_wait_queue(&state->wait_queue, &wait);
739 spin_unlock_irqrestore(&state->lock, flags);
740
741 if (ret)
742 return ret;
743
744 ret = req->reply_len;
745 if (ret > count)
746 ret = count;
747 if (ret > 0 && copy_to_user(buf, req->reply, ret))
748 ret = -EFAULT;
749
750 kfree(req);
751 return ret;
752}
753
754static ssize_t adb_write(struct file *file, const char __user *buf,
755 size_t count, loff_t *ppos)
756{
757 int ret/*, i*/;
758 struct adbdev_state *state = file->private_data;
759 struct adb_request *req;
760
761 if (count < 2 || count > sizeof(req->data))
762 return -EINVAL;
763 if (adb_controller == NULL)
764 return -ENXIO;
765 if (!access_ok(VERIFY_READ, buf, count))
766 return -EFAULT;
767
768 req = kmalloc(sizeof(struct adb_request),
769 GFP_KERNEL);
770 if (req == NULL)
771 return -ENOMEM;
772
773 req->nbytes = count;
774 req->done = adb_write_done;
775 req->arg = (void *) state;
776 req->complete = 0;
777
778 ret = -EFAULT;
779 if (copy_from_user(req->data, buf, count))
780 goto out;
781
782 atomic_inc(&state->n_pending);
783
784 /* If a probe is in progress or we are sleeping, wait for it to complete */
785 down(&adb_probe_mutex);
786
787 /* Queries are special requests sent to the ADB driver itself */
788 if (req->data[0] == ADB_QUERY) {
789 if (count > 1)
790 ret = do_adb_query(req);
791 else
792 ret = -EINVAL;
793 up(&adb_probe_mutex);
794 }
795 /* Special case for ADB_BUSRESET request, all others are sent to
796 the controller */
797 else if ((req->data[0] == ADB_PACKET)&&(count > 1)
798 &&(req->data[1] == ADB_BUSRESET)) {
799 ret = do_adb_reset_bus();
800 up(&adb_probe_mutex);
801 atomic_dec(&state->n_pending);
802 if (ret == 0)
803 ret = count;
804 goto out;
805 } else {
806 req->reply_expected = ((req->data[1] & 0xc) == 0xc);
807 if (adb_controller && adb_controller->send_request)
808 ret = adb_controller->send_request(req, 0);
809 else
810 ret = -ENXIO;
811 up(&adb_probe_mutex);
812 }
813
814 if (ret != 0) {
815 atomic_dec(&state->n_pending);
816 goto out;
817 }
818 return count;
819
820out:
821 kfree(req);
822 return ret;
823}
824
825static const struct file_operations adb_fops = {
826 .owner = THIS_MODULE,
827 .llseek = no_llseek,
828 .read = adb_read,
829 .write = adb_write,
830 .open = adb_open,
831 .release = adb_release,
832};
833
834static struct platform_driver adb_pfdrv = {
835 .driver = {
836 .name = "adb",
837 },
838#ifdef CONFIG_PM
839 .suspend = adb_suspend,
840 .resume = adb_resume,
841#endif
842};
843
844static struct platform_device adb_pfdev = {
845 .name = "adb",
846};
847
848static int __init
849adb_dummy_probe(struct platform_device *dev)
850{
851 if (dev == &adb_pfdev)
852 return 0;
853 return -ENODEV;
854}
855
856static void __init
857adbdev_init(void)
858{
859 if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) {
860 printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR);
861 return;
862 }
863
864 adb_dev_class = class_create(THIS_MODULE, "adb");
865 if (IS_ERR(adb_dev_class))
866 return;
867 device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
868
869 platform_device_register(&adb_pfdev);
870 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
871}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Device driver for the Apple Desktop Bus
4 * and the /dev/adb device on macintoshes.
5 *
6 * Copyright (C) 1996 Paul Mackerras.
7 *
8 * Modified to declare controllers as structures, added
9 * client notification of bus reset and handles PowerBook
10 * sleep, by Benjamin Herrenschmidt.
11 *
12 * To do:
13 *
14 * - /sys/bus/adb to list the devices and infos
15 * - more /dev/adb to allow userland to receive the
16 * flow of auto-polling datas from a given device.
17 * - move bus probe to a kernel thread
18 */
19
20#include <linux/types.h>
21#include <linux/errno.h>
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/fs.h>
26#include <linux/mm.h>
27#include <linux/sched/signal.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#include <linux/of.h>
42
43#include <linux/uaccess.h>
44#ifdef CONFIG_PPC
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_cuda_driver;
53extern struct adb_driver adb_iop_driver;
54extern struct adb_driver via_pmu_driver;
55extern struct adb_driver macio_adb_driver;
56
57static DEFINE_MUTEX(adb_mutex);
58static struct adb_driver *adb_driver_list[] = {
59#ifdef CONFIG_ADB_MACII
60 &via_macii_driver,
61#endif
62#ifdef CONFIG_ADB_CUDA
63 &via_cuda_driver,
64#endif
65#ifdef CONFIG_ADB_IOP
66 &adb_iop_driver,
67#endif
68#ifdef CONFIG_ADB_PMU
69 &via_pmu_driver,
70#endif
71#ifdef CONFIG_ADB_MACIO
72 &macio_adb_driver,
73#endif
74 NULL
75};
76
77static const struct class adb_dev_class = {
78 .name = "adb",
79};
80
81static struct adb_driver *adb_controller;
82BLOCKING_NOTIFIER_HEAD(adb_client_list);
83static int adb_got_sleep;
84static int adb_inited;
85static DEFINE_SEMAPHORE(adb_probe_mutex, 1);
86static int sleepy_trackpad;
87static int autopoll_devs;
88int __adb_probe_sync;
89
90static int adb_scan_bus(void);
91static int do_adb_reset_bus(void);
92static void adbdev_init(void);
93static int try_handler_change(int, int);
94
95static struct adb_handler {
96 void (*handler)(unsigned char *, int, int);
97 int original_address;
98 int handler_id;
99 int busy;
100} adb_handler[16];
101
102/*
103 * The adb_handler_mutex mutex protects all accesses to the original_address
104 * and handler_id fields of adb_handler[i] for all i, and changes to the
105 * handler field.
106 * Accesses to the handler field are protected by the adb_handler_lock
107 * rwlock. It is held across all calls to any handler, so that by the
108 * time adb_unregister returns, we know that the old handler isn't being
109 * called.
110 */
111static DEFINE_MUTEX(adb_handler_mutex);
112static DEFINE_RWLOCK(adb_handler_lock);
113
114#if 0
115static void printADBreply(struct adb_request *req)
116{
117 int i;
118
119 printk("adb reply (%d)", req->reply_len);
120 for(i = 0; i < req->reply_len; i++)
121 printk(" %x", req->reply[i]);
122 printk("\n");
123
124}
125#endif
126
127static int adb_scan_bus(void)
128{
129 int i, highFree=0, noMovement;
130 int devmask = 0;
131 struct adb_request req;
132
133 /* assumes adb_handler[] is all zeroes at this point */
134 for (i = 1; i < 16; i++) {
135 /* see if there is anything at address i */
136 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
137 (i << 4) | 0xf);
138 if (req.reply_len > 1)
139 /* one or more devices at this address */
140 adb_handler[i].original_address = i;
141 else if (i > highFree)
142 highFree = i;
143 }
144
145 /* Note we reset noMovement to 0 each time we move a device */
146 for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) {
147 for (i = 1; i < 16; i++) {
148 if (adb_handler[i].original_address == 0)
149 continue;
150 /*
151 * Send a "talk register 3" command to address i
152 * to provoke a collision if there is more than
153 * one device at this address.
154 */
155 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
156 (i << 4) | 0xf);
157 /*
158 * Move the device(s) which didn't detect a
159 * collision to address `highFree'. Hopefully
160 * this only moves one device.
161 */
162 adb_request(&req, NULL, ADBREQ_SYNC, 3,
163 (i<< 4) | 0xb, (highFree | 0x60), 0xfe);
164 /*
165 * See if anybody actually moved. This is suggested
166 * by HW TechNote 01:
167 *
168 * https://developer.apple.com/technotes/hw/hw_01.html
169 */
170 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
171 (highFree << 4) | 0xf);
172 if (req.reply_len <= 1) continue;
173 /*
174 * Test whether there are any device(s) left
175 * at address i.
176 */
177 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
178 (i << 4) | 0xf);
179 if (req.reply_len > 1) {
180 /*
181 * There are still one or more devices
182 * left at address i. Register the one(s)
183 * we moved to `highFree', and find a new
184 * value for highFree.
185 */
186 adb_handler[highFree].original_address =
187 adb_handler[i].original_address;
188 while (highFree > 0 &&
189 adb_handler[highFree].original_address)
190 highFree--;
191 if (highFree <= 0)
192 break;
193
194 noMovement = 0;
195 } else {
196 /*
197 * No devices left at address i; move the
198 * one(s) we moved to `highFree' back to i.
199 */
200 adb_request(&req, NULL, ADBREQ_SYNC, 3,
201 (highFree << 4) | 0xb,
202 (i | 0x60), 0xfe);
203 }
204 }
205 }
206
207 /* Now fill in the handler_id field of the adb_handler entries. */
208 for (i = 1; i < 16; i++) {
209 if (adb_handler[i].original_address == 0)
210 continue;
211 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
212 (i << 4) | 0xf);
213 adb_handler[i].handler_id = req.reply[2];
214 printk(KERN_DEBUG "adb device [%d]: %d 0x%X\n", i,
215 adb_handler[i].original_address,
216 adb_handler[i].handler_id);
217 devmask |= 1 << i;
218 }
219 return devmask;
220}
221
222/*
223 * This kernel task handles ADB probing. It dies once probing is
224 * completed.
225 */
226static int
227adb_probe_task(void *x)
228{
229 pr_debug("adb: starting probe task...\n");
230 do_adb_reset_bus();
231 pr_debug("adb: finished probe task...\n");
232
233 up(&adb_probe_mutex);
234
235 return 0;
236}
237
238static void
239__adb_probe_task(struct work_struct *bullshit)
240{
241 kthread_run(adb_probe_task, NULL, "kadbprobe");
242}
243
244static DECLARE_WORK(adb_reset_work, __adb_probe_task);
245
246int
247adb_reset_bus(void)
248{
249 if (__adb_probe_sync) {
250 do_adb_reset_bus();
251 return 0;
252 }
253
254 down(&adb_probe_mutex);
255 schedule_work(&adb_reset_work);
256 return 0;
257}
258
259#ifdef CONFIG_PM
260/*
261 * notify clients before sleep
262 */
263static int __adb_suspend(struct platform_device *dev, pm_message_t state)
264{
265 adb_got_sleep = 1;
266 /* We need to get a lock on the probe thread */
267 down(&adb_probe_mutex);
268 /* Stop autopoll */
269 if (adb_controller->autopoll)
270 adb_controller->autopoll(0);
271 blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL);
272
273 return 0;
274}
275
276static int adb_suspend(struct device *dev)
277{
278 return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND);
279}
280
281static int adb_freeze(struct device *dev)
282{
283 return __adb_suspend(to_platform_device(dev), PMSG_FREEZE);
284}
285
286static int adb_poweroff(struct device *dev)
287{
288 return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE);
289}
290
291/*
292 * reset bus after sleep
293 */
294static int __adb_resume(struct platform_device *dev)
295{
296 adb_got_sleep = 0;
297 up(&adb_probe_mutex);
298 adb_reset_bus();
299
300 return 0;
301}
302
303static int adb_resume(struct device *dev)
304{
305 return __adb_resume(to_platform_device(dev));
306}
307#endif /* CONFIG_PM */
308
309static int __init adb_init(void)
310{
311 struct adb_driver *driver;
312 int i;
313
314#ifdef CONFIG_PPC32
315 if (!machine_is(chrp) && !machine_is(powermac))
316 return 0;
317#endif
318#ifdef CONFIG_MAC
319 if (!MACH_IS_MAC)
320 return 0;
321#endif
322
323 /* xmon may do early-init */
324 if (adb_inited)
325 return 0;
326 adb_inited = 1;
327
328 adb_controller = NULL;
329
330 i = 0;
331 while ((driver = adb_driver_list[i++]) != NULL) {
332 if (!driver->probe()) {
333 adb_controller = driver;
334 break;
335 }
336 }
337 if (adb_controller != NULL && adb_controller->init &&
338 adb_controller->init())
339 adb_controller = NULL;
340 if (adb_controller == NULL) {
341 pr_warn("Warning: no ADB interface detected\n");
342 } else {
343#ifdef CONFIG_PPC
344 if (of_machine_is_compatible("AAPL,PowerBook1998") ||
345 of_machine_is_compatible("PowerBook1,1"))
346 sleepy_trackpad = 1;
347#endif /* CONFIG_PPC */
348
349 adbdev_init();
350 adb_reset_bus();
351 }
352 return 0;
353}
354
355device_initcall(adb_init);
356
357static int
358do_adb_reset_bus(void)
359{
360 int ret;
361
362 if (adb_controller == NULL)
363 return -ENXIO;
364
365 if (adb_controller->autopoll)
366 adb_controller->autopoll(0);
367
368 blocking_notifier_call_chain(&adb_client_list,
369 ADB_MSG_PRE_RESET, NULL);
370
371 if (sleepy_trackpad) {
372 /* Let the trackpad settle down */
373 msleep(500);
374 }
375
376 mutex_lock(&adb_handler_mutex);
377 write_lock_irq(&adb_handler_lock);
378 memset(adb_handler, 0, sizeof(adb_handler));
379 write_unlock_irq(&adb_handler_lock);
380
381 /* That one is still a bit synchronous, oh well... */
382 if (adb_controller->reset_bus)
383 ret = adb_controller->reset_bus();
384 else
385 ret = 0;
386
387 if (sleepy_trackpad) {
388 /* Let the trackpad settle down */
389 msleep(1500);
390 }
391
392 if (!ret) {
393 autopoll_devs = adb_scan_bus();
394 if (adb_controller->autopoll)
395 adb_controller->autopoll(autopoll_devs);
396 }
397 mutex_unlock(&adb_handler_mutex);
398
399 blocking_notifier_call_chain(&adb_client_list,
400 ADB_MSG_POST_RESET, NULL);
401
402 return ret;
403}
404
405void
406adb_poll(void)
407{
408 if ((adb_controller == NULL)||(adb_controller->poll == NULL))
409 return;
410 adb_controller->poll();
411}
412EXPORT_SYMBOL(adb_poll);
413
414static void adb_sync_req_done(struct adb_request *req)
415{
416 struct completion *comp = req->arg;
417
418 complete(comp);
419}
420
421int
422adb_request(struct adb_request *req, void (*done)(struct adb_request *),
423 int flags, int nbytes, ...)
424{
425 va_list list;
426 int i;
427 int rc;
428 struct completion comp;
429
430 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
431 return -ENXIO;
432 if (nbytes < 1)
433 return -EINVAL;
434
435 req->nbytes = nbytes+1;
436 req->done = done;
437 req->reply_expected = flags & ADBREQ_REPLY;
438 req->data[0] = ADB_PACKET;
439 va_start(list, nbytes);
440 for (i = 0; i < nbytes; ++i)
441 req->data[i+1] = va_arg(list, int);
442 va_end(list);
443
444 if (flags & ADBREQ_NOSEND)
445 return 0;
446
447 /* Synchronous requests block using an on-stack completion */
448 if (flags & ADBREQ_SYNC) {
449 WARN_ON(done);
450 req->done = adb_sync_req_done;
451 req->arg = ∁
452 init_completion(&comp);
453 }
454
455 rc = adb_controller->send_request(req, 0);
456
457 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
458 wait_for_completion(&comp);
459
460 return rc;
461}
462EXPORT_SYMBOL(adb_request);
463
464 /* Ultimately this should return the number of devices with
465 the given default id.
466 And it does it now ! Note: changed behaviour: This function
467 will now register if default_id _and_ handler_id both match
468 but handler_id can be left to 0 to match with default_id only.
469 When handler_id is set, this function will try to adjust
470 the handler_id id it doesn't match. */
471int
472adb_register(int default_id, int handler_id, struct adb_ids *ids,
473 void (*handler)(unsigned char *, int, int))
474{
475 int i;
476
477 mutex_lock(&adb_handler_mutex);
478 ids->nids = 0;
479 for (i = 1; i < 16; i++) {
480 if ((adb_handler[i].original_address == default_id) &&
481 (!handler_id || (handler_id == adb_handler[i].handler_id) ||
482 try_handler_change(i, handler_id))) {
483 if (adb_handler[i].handler) {
484 pr_err("Two handlers for ADB device %d\n",
485 default_id);
486 continue;
487 }
488 write_lock_irq(&adb_handler_lock);
489 adb_handler[i].handler = handler;
490 write_unlock_irq(&adb_handler_lock);
491 ids->id[ids->nids++] = i;
492 }
493 }
494 mutex_unlock(&adb_handler_mutex);
495 return ids->nids;
496}
497EXPORT_SYMBOL(adb_register);
498
499int
500adb_unregister(int index)
501{
502 int ret = -ENODEV;
503
504 mutex_lock(&adb_handler_mutex);
505 write_lock_irq(&adb_handler_lock);
506 if (adb_handler[index].handler) {
507 while(adb_handler[index].busy) {
508 write_unlock_irq(&adb_handler_lock);
509 yield();
510 write_lock_irq(&adb_handler_lock);
511 }
512 ret = 0;
513 adb_handler[index].handler = NULL;
514 }
515 write_unlock_irq(&adb_handler_lock);
516 mutex_unlock(&adb_handler_mutex);
517 return ret;
518}
519EXPORT_SYMBOL(adb_unregister);
520
521void
522adb_input(unsigned char *buf, int nb, int autopoll)
523{
524 int i, id;
525 static int dump_adb_input;
526 unsigned long flags;
527
528 void (*handler)(unsigned char *, int, int);
529
530 /* We skip keystrokes and mouse moves when the sleep process
531 * has been started. We stop autopoll, but this is another security
532 */
533 if (adb_got_sleep)
534 return;
535
536 id = buf[0] >> 4;
537 if (dump_adb_input) {
538 pr_info("adb packet: ");
539 for (i = 0; i < nb; ++i)
540 pr_cont(" %x", buf[i]);
541 pr_cont(", id = %d\n", id);
542 }
543 write_lock_irqsave(&adb_handler_lock, flags);
544 handler = adb_handler[id].handler;
545 if (handler != NULL)
546 adb_handler[id].busy = 1;
547 write_unlock_irqrestore(&adb_handler_lock, flags);
548 if (handler != NULL) {
549 (*handler)(buf, nb, autopoll);
550 wmb();
551 adb_handler[id].busy = 0;
552 }
553
554}
555
556/* Try to change handler to new_id. Will return 1 if successful. */
557static int try_handler_change(int address, int new_id)
558{
559 struct adb_request req;
560
561 if (adb_handler[address].handler_id == new_id)
562 return 1;
563 adb_request(&req, NULL, ADBREQ_SYNC, 3,
564 ADB_WRITEREG(address, 3), address | 0x20, new_id);
565 adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1,
566 ADB_READREG(address, 3));
567 if (req.reply_len < 2)
568 return 0;
569 if (req.reply[2] != new_id)
570 return 0;
571 adb_handler[address].handler_id = req.reply[2];
572
573 return 1;
574}
575
576int
577adb_try_handler_change(int address, int new_id)
578{
579 int ret;
580
581 mutex_lock(&adb_handler_mutex);
582 ret = try_handler_change(address, new_id);
583 mutex_unlock(&adb_handler_mutex);
584 if (ret)
585 pr_debug("adb handler change: [%d] 0x%X\n", address, new_id);
586 return ret;
587}
588EXPORT_SYMBOL(adb_try_handler_change);
589
590int
591adb_get_infos(int address, int *original_address, int *handler_id)
592{
593 mutex_lock(&adb_handler_mutex);
594 *original_address = adb_handler[address].original_address;
595 *handler_id = adb_handler[address].handler_id;
596 mutex_unlock(&adb_handler_mutex);
597
598 return (*original_address != 0);
599}
600
601
602/*
603 * /dev/adb device driver.
604 */
605
606#define ADB_MAJOR 56 /* major number for /dev/adb */
607
608struct adbdev_state {
609 spinlock_t lock;
610 atomic_t n_pending;
611 struct adb_request *completed;
612 wait_queue_head_t wait_queue;
613 int inuse;
614};
615
616static void adb_write_done(struct adb_request *req)
617{
618 struct adbdev_state *state = (struct adbdev_state *) req->arg;
619 unsigned long flags;
620
621 if (!req->complete) {
622 req->reply_len = 0;
623 req->complete = 1;
624 }
625 spin_lock_irqsave(&state->lock, flags);
626 atomic_dec(&state->n_pending);
627 if (!state->inuse) {
628 kfree(req);
629 if (atomic_read(&state->n_pending) == 0) {
630 spin_unlock_irqrestore(&state->lock, flags);
631 kfree(state);
632 return;
633 }
634 } else {
635 struct adb_request **ap = &state->completed;
636 while (*ap != NULL)
637 ap = &(*ap)->next;
638 req->next = NULL;
639 *ap = req;
640 wake_up_interruptible(&state->wait_queue);
641 }
642 spin_unlock_irqrestore(&state->lock, flags);
643}
644
645static int
646do_adb_query(struct adb_request *req)
647{
648 int ret = -EINVAL;
649
650 switch(req->data[1]) {
651 case ADB_QUERY_GETDEVINFO:
652 if (req->nbytes < 3 || req->data[2] >= 16)
653 break;
654 mutex_lock(&adb_handler_mutex);
655 req->reply[0] = adb_handler[req->data[2]].original_address;
656 req->reply[1] = adb_handler[req->data[2]].handler_id;
657 mutex_unlock(&adb_handler_mutex);
658 req->complete = 1;
659 req->reply_len = 2;
660 adb_write_done(req);
661 ret = 0;
662 break;
663 }
664 return ret;
665}
666
667static int adb_open(struct inode *inode, struct file *file)
668{
669 struct adbdev_state *state;
670 int ret = 0;
671
672 mutex_lock(&adb_mutex);
673 if (iminor(inode) > 0 || adb_controller == NULL) {
674 ret = -ENXIO;
675 goto out;
676 }
677 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
678 if (!state) {
679 ret = -ENOMEM;
680 goto out;
681 }
682 file->private_data = state;
683 spin_lock_init(&state->lock);
684 atomic_set(&state->n_pending, 0);
685 state->completed = NULL;
686 init_waitqueue_head(&state->wait_queue);
687 state->inuse = 1;
688
689out:
690 mutex_unlock(&adb_mutex);
691 return ret;
692}
693
694static int adb_release(struct inode *inode, struct file *file)
695{
696 struct adbdev_state *state = file->private_data;
697 unsigned long flags;
698
699 mutex_lock(&adb_mutex);
700 if (state) {
701 file->private_data = NULL;
702 spin_lock_irqsave(&state->lock, flags);
703 if (atomic_read(&state->n_pending) == 0
704 && state->completed == NULL) {
705 spin_unlock_irqrestore(&state->lock, flags);
706 kfree(state);
707 } else {
708 state->inuse = 0;
709 spin_unlock_irqrestore(&state->lock, flags);
710 }
711 }
712 mutex_unlock(&adb_mutex);
713 return 0;
714}
715
716static ssize_t adb_read(struct file *file, char __user *buf,
717 size_t count, loff_t *ppos)
718{
719 int ret = 0;
720 struct adbdev_state *state = file->private_data;
721 struct adb_request *req;
722 DECLARE_WAITQUEUE(wait, current);
723 unsigned long flags;
724
725 if (count < 2)
726 return -EINVAL;
727 if (count > sizeof(req->reply))
728 count = sizeof(req->reply);
729
730 req = NULL;
731 spin_lock_irqsave(&state->lock, flags);
732 add_wait_queue(&state->wait_queue, &wait);
733 set_current_state(TASK_INTERRUPTIBLE);
734
735 for (;;) {
736 req = state->completed;
737 if (req != NULL)
738 state->completed = req->next;
739 else if (atomic_read(&state->n_pending) == 0)
740 ret = -EIO;
741 if (req != NULL || ret != 0)
742 break;
743
744 if (file->f_flags & O_NONBLOCK) {
745 ret = -EAGAIN;
746 break;
747 }
748 if (signal_pending(current)) {
749 ret = -ERESTARTSYS;
750 break;
751 }
752 spin_unlock_irqrestore(&state->lock, flags);
753 schedule();
754 spin_lock_irqsave(&state->lock, flags);
755 }
756
757 set_current_state(TASK_RUNNING);
758 remove_wait_queue(&state->wait_queue, &wait);
759 spin_unlock_irqrestore(&state->lock, flags);
760
761 if (ret)
762 return ret;
763
764 ret = req->reply_len;
765 if (ret > count)
766 ret = count;
767 if (ret > 0 && copy_to_user(buf, req->reply, ret))
768 ret = -EFAULT;
769
770 kfree(req);
771 return ret;
772}
773
774static ssize_t adb_write(struct file *file, const char __user *buf,
775 size_t count, loff_t *ppos)
776{
777 int ret/*, i*/;
778 struct adbdev_state *state = file->private_data;
779 struct adb_request *req;
780
781 if (count < 2 || count > sizeof(req->data))
782 return -EINVAL;
783 if (adb_controller == NULL)
784 return -ENXIO;
785
786 req = kmalloc(sizeof(struct adb_request),
787 GFP_KERNEL);
788 if (req == NULL)
789 return -ENOMEM;
790
791 req->nbytes = count;
792 req->done = adb_write_done;
793 req->arg = (void *) state;
794 req->complete = 0;
795
796 ret = -EFAULT;
797 if (copy_from_user(req->data, buf, count))
798 goto out;
799
800 atomic_inc(&state->n_pending);
801
802 /* If a probe is in progress or we are sleeping, wait for it to complete */
803 down(&adb_probe_mutex);
804
805 /* Queries are special requests sent to the ADB driver itself */
806 if (req->data[0] == ADB_QUERY) {
807 if (count > 1)
808 ret = do_adb_query(req);
809 else
810 ret = -EINVAL;
811 up(&adb_probe_mutex);
812 }
813 /* Special case for ADB_BUSRESET request, all others are sent to
814 the controller */
815 else if ((req->data[0] == ADB_PACKET) && (count > 1)
816 && (req->data[1] == ADB_BUSRESET)) {
817 ret = do_adb_reset_bus();
818 up(&adb_probe_mutex);
819 atomic_dec(&state->n_pending);
820 if (ret == 0)
821 ret = count;
822 goto out;
823 } else {
824 req->reply_expected = ((req->data[1] & 0xc) == 0xc);
825 if (adb_controller && adb_controller->send_request)
826 ret = adb_controller->send_request(req, 0);
827 else
828 ret = -ENXIO;
829 up(&adb_probe_mutex);
830 }
831
832 if (ret != 0) {
833 atomic_dec(&state->n_pending);
834 goto out;
835 }
836 return count;
837
838out:
839 kfree(req);
840 return ret;
841}
842
843static const struct file_operations adb_fops = {
844 .owner = THIS_MODULE,
845 .read = adb_read,
846 .write = adb_write,
847 .open = adb_open,
848 .release = adb_release,
849};
850
851#ifdef CONFIG_PM
852static const struct dev_pm_ops adb_dev_pm_ops = {
853 .suspend = adb_suspend,
854 .resume = adb_resume,
855 /* Hibernate hooks */
856 .freeze = adb_freeze,
857 .thaw = adb_resume,
858 .poweroff = adb_poweroff,
859 .restore = adb_resume,
860};
861#endif
862
863static struct platform_driver adb_pfdrv = {
864 .driver = {
865 .name = "adb",
866#ifdef CONFIG_PM
867 .pm = &adb_dev_pm_ops,
868#endif
869 },
870};
871
872static struct platform_device adb_pfdev = {
873 .name = "adb",
874};
875
876static int __init
877adb_dummy_probe(struct platform_device *dev)
878{
879 if (dev == &adb_pfdev)
880 return 0;
881 return -ENODEV;
882}
883
884static void __init
885adbdev_init(void)
886{
887 if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) {
888 pr_err("adb: unable to get major %d\n", ADB_MAJOR);
889 return;
890 }
891
892 if (class_register(&adb_dev_class))
893 return;
894
895 device_create(&adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
896
897 platform_device_register(&adb_pfdev);
898 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
899}