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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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>
Paul Mackerrasc61dace2007-12-13 15:11:22 +110037#include <linux/kthread.h>
Geert Uytterhoevenfe2528b2008-02-03 16:49:09 +010038#include <linux/platform_device.h>
Daniel Walkeraf3ce512008-05-03 06:34:03 +100039#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#ifdef CONFIG_PPC
43#include <asm/prom.h>
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +110044#include <asm/machdep.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#endif
46
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048EXPORT_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
Arnd Bergmannd851b6e2010-06-02 14:28:52 +020057static DEFINE_MUTEX(adb_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static 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
gregkh@suse.de56b22932005-03-23 10:01:41 -080080static struct class *adb_dev_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Adrian Bunk9b4a8dd2008-06-24 03:46:57 +100082static struct adb_driver *adb_controller;
Alan Sterne041c682006-03-27 01:16:30 -080083BLOCKING_NOTIFIER_HEAD(adb_client_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084static int adb_got_sleep;
85static int adb_inited;
Thomas Gleixner8192b1f2010-09-07 14:33:40 +000086static DEFINE_SEMAPHORE(adb_probe_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static int sleepy_trackpad;
88static int autopoll_devs;
89int __adb_probe_sync;
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static 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 {
David Howells7d12e782006-10-05 14:55:46 +010097 void (*handler)(unsigned char *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 int original_address;
99 int handler_id;
100 int busy;
101} adb_handler[16];
102
103/*
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000104 * The adb_handler_mutex mutex protects all accesses to the original_address
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 * 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 */
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000112static DEFINE_MUTEX(adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128static 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{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 printk(KERN_INFO "adb: starting probe task...\n");
233 do_adb_reset_bus();
234 printk(KERN_INFO "adb: finished probe task...\n");
Oleg Nesterov1b6dd9b2007-07-15 23:41:29 -0700235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 up(&adb_probe_mutex);
Oleg Nesterov1b6dd9b2007-07-15 23:41:29 -0700237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return 0;
239}
240
241static void
Al Viro3e577a82006-12-06 18:41:45 +0000242__adb_probe_task(struct work_struct *bullshit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100244 kthread_run(adb_probe_task, NULL, "kadbprobe");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
Al Viro3e577a82006-12-06 18:41:45 +0000247static DECLARE_WORK(adb_reset_work, __adb_probe_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
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
Johannes Bergc9f6d3d2007-12-12 01:21:25 +1100262#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
Adrian Bunk9b4a8dd2008-06-24 03:46:57 +1000292static int __init adb_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
294 struct adb_driver *driver;
295 int i;
296
297#ifdef CONFIG_PPC32
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100298 if (!machine_is(chrp) && !machine_is(powermac))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 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 }
Finn Thain18814ee2009-11-17 20:03:05 +1100320 if (adb_controller != NULL && adb_controller->init &&
321 adb_controller->init())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 adb_controller = NULL;
Finn Thain18814ee2009-11-17 20:03:05 +1100323 if (adb_controller == NULL) {
324 printk(KERN_WARNING "Warning: no ADB interface detected\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326#ifdef CONFIG_PPC
Grant Likely71a157e2010-02-01 21:34:14 -0700327 if (of_machine_is_compatible("AAPL,PowerBook1998") ||
328 of_machine_is_compatible("PowerBook1,1"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 sleepy_trackpad = 1;
330#endif /* CONFIG_PPC */
Johannes Bergc9f6d3d2007-12-12 01:21:25 +1100331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 adbdev_init();
333 adb_reset_bus();
334 }
335 return 0;
336}
337
Robert P. J. Dayfaa5b9d2008-05-15 09:12:53 +1000338device_initcall(adb_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static int
341do_adb_reset_bus(void)
342{
Johannes Berg70b52b32007-03-19 11:53:55 +0100343 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 if (adb_controller == NULL)
346 return -ENXIO;
347
348 if (adb_controller->autopoll)
349 adb_controller->autopoll(0);
350
Johannes Berg70b52b32007-03-19 11:53:55 +0100351 blocking_notifier_call_chain(&adb_client_list,
352 ADB_MSG_PRE_RESET, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354 if (sleepy_trackpad) {
355 /* Let the trackpad settle down */
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100356 msleep(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
358
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000359 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 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 */
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100372 msleep(1500);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
374
375 if (!ret) {
376 autopoll_devs = adb_scan_bus();
377 if (adb_controller->autopoll)
378 adb_controller->autopoll(autopoll_devs);
379 }
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000380 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Johannes Berg70b52b32007-03-19 11:53:55 +0100382 blocking_notifier_call_chain(&adb_client_list,
383 ADB_MSG_POST_RESET, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
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
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100396static void adb_sync_req_done(struct adb_request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100398 struct completion *comp = req->arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100400 complete(comp);
401}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403int
404adb_request(struct adb_request *req, void (*done)(struct adb_request *),
405 int flags, int nbytes, ...)
406{
407 va_list list;
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100408 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 int rc;
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100410 struct completion comp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 if ((adb_controller == NULL) || (adb_controller->send_request == NULL))
413 return -ENXIO;
414 if (nbytes < 1)
415 return -EINVAL;
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 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
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100429 /* 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 = &comp;
434 init_completion(&comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 }
436
Paul Mackerrasc61dace2007-12-13 15:11:22 +1100437 rc = adb_controller->send_request(req, 0);
438
439 if ((flags & ADBREQ_SYNC) && !rc && !req->complete)
440 wait_for_completion(&comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
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,
David Howells7d12e782006-10-05 14:55:46 +0100454 void (*handler)(unsigned char *, int, int))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
456 int i;
457
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000458 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 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 }
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000476 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 return ids->nids;
478}
479
480int
481adb_unregister(int index)
482{
483 int ret = -ENODEV;
484
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000485 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 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);
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000497 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 return ret;
499}
500
501void
David Howells7d12e782006-10-05 14:55:46 +0100502adb_input(unsigned char *buf, int nb, int autopoll)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
504 int i, id;
505 static int dump_adb_input = 0;
506 unsigned long flags;
507
David Howells7d12e782006-10-05 14:55:46 +0100508 void (*handler)(unsigned char *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
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) {
David Howells7d12e782006-10-05 14:55:46 +0100529 (*handler)(buf, nb, autopoll);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 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
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000561 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 ret = try_handler_change(address, new_id);
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000563 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 return ret;
565}
566
567int
568adb_get_infos(int address, int *original_address, int *handler_id)
569{
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000570 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 *original_address = adb_handler[address].original_address;
572 *handler_id = adb_handler[address].handler_id;
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000573 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
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;
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000632 mutex_lock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 req->reply[0] = adb_handler[req->data[2]].original_address;
634 req->reply[1] = adb_handler[req->data[2]].handler_id;
Daniel Walkeraf3ce512008-05-03 06:34:03 +1000635 mutex_unlock(&adb_handler_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 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;
Jonathan Corbet26ce4f02008-05-16 14:19:56 -0600648 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Arnd Bergmannd851b6e2010-06-02 14:28:52 +0200650 mutex_lock(&adb_mutex);
Jonathan Corbet26ce4f02008-05-16 14:19:56 -0600651 if (iminor(inode) > 0 || adb_controller == NULL) {
652 ret = -ENXIO;
653 goto out;
654 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL);
Jonathan Corbet26ce4f02008-05-16 14:19:56 -0600656 if (state == 0) {
657 ret = -ENOMEM;
658 goto out;
659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 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
Jonathan Corbet26ce4f02008-05-16 14:19:56 -0600667out:
Arnd Bergmannd851b6e2010-06-02 14:28:52 +0200668 mutex_unlock(&adb_mutex);
Jonathan Corbet26ce4f02008-05-16 14:19:56 -0600669 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670}
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
Arnd Bergmannd851b6e2010-06-02 14:28:52 +0200677 mutex_lock(&adb_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 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 }
Arnd Bergmannd851b6e2010-06-02 14:28:52 +0200690 mutex_unlock(&adb_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 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);
majianpeng64f8c132012-02-03 14:35:59 +0000713 set_current_state(TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
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
majianpeng64f8c132012-02-03 14:35:59 +0000737 set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 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
Robert P. J. Day5cbded52006-12-13 00:35:56 -0800768 req = kmalloc(sizeof(struct adb_request),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 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
Arjan van de Venfa027c22007-02-12 00:55:33 -0800825static const struct file_operations adb_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 .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
Johannes Bergc9f6d3d2007-12-12 01:21:25 +1100834static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857adbdev_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
gregkh@suse.de56b22932005-03-23 10:01:41 -0800864 adb_dev_class = class_create(THIS_MODULE, "adb");
865 if (IS_ERR(adb_dev_class))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 return;
Greg Kroah-Hartmana9b12612008-07-21 20:03:34 -0700867 device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb");
Johannes Bergc9f6d3d2007-12-12 01:21:25 +1100868
869 platform_device_register(&adb_pfdev);
870 platform_driver_probe(&adb_pfdrv, adb_dummy_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871}