Commit | Line | Data |
---|---|---|
1da177e4 LT |
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/config.h> | |
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.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <linux/adb.h> | |
30 | #include <linux/cuda.h> | |
31 | #include <linux/pmu.h> | |
32 | #include <linux/notifier.h> | |
33 | #include <linux/wait.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/spinlock.h> | |
37 | #include <linux/completion.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/devfs_fs_kernel.h> | |
40 | ||
41 | #include <asm/uaccess.h> | |
42 | #include <asm/semaphore.h> | |
43 | #ifdef CONFIG_PPC | |
44 | #include <asm/prom.h> | |
45 | #endif | |
46 | ||
47 | ||
48 | EXPORT_SYMBOL(adb_controller); | |
49 | EXPORT_SYMBOL(adb_client_list); | |
50 | ||
51 | extern struct adb_driver via_macii_driver; | |
52 | extern struct adb_driver via_maciisi_driver; | |
53 | extern struct adb_driver via_cuda_driver; | |
54 | extern struct adb_driver adb_iop_driver; | |
55 | extern struct adb_driver via_pmu_driver; | |
56 | extern struct adb_driver macio_adb_driver; | |
57 | ||
58 | static 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 | ||
56b22935 | 80 | static struct class *adb_dev_class; |
1da177e4 LT |
81 | |
82 | struct adb_driver *adb_controller; | |
e041c683 | 83 | BLOCKING_NOTIFIER_HEAD(adb_client_list); |
1da177e4 LT |
84 | static int adb_got_sleep; |
85 | static int adb_inited; | |
86 | static pid_t adb_probe_task_pid; | |
87 | static DECLARE_MUTEX(adb_probe_mutex); | |
88 | static struct completion adb_probe_task_comp; | |
89 | static int sleepy_trackpad; | |
90 | static int autopoll_devs; | |
91 | int __adb_probe_sync; | |
92 | ||
8c870933 | 93 | #ifdef CONFIG_PM |
1da177e4 LT |
94 | static int adb_notify_sleep(struct pmu_sleep_notifier *self, int when); |
95 | static struct pmu_sleep_notifier adb_sleep_notifier = { | |
96 | adb_notify_sleep, | |
97 | SLEEP_LEVEL_ADB, | |
98 | }; | |
99 | #endif | |
100 | ||
101 | static int adb_scan_bus(void); | |
102 | static int do_adb_reset_bus(void); | |
103 | static void adbdev_init(void); | |
104 | static int try_handler_change(int, int); | |
105 | ||
106 | static struct adb_handler { | |
107 | void (*handler)(unsigned char *, int, struct pt_regs *, int); | |
108 | int original_address; | |
109 | int handler_id; | |
110 | int busy; | |
111 | } adb_handler[16]; | |
112 | ||
113 | /* | |
114 | * The adb_handler_sem mutex protects all accesses to the original_address | |
115 | * and handler_id fields of adb_handler[i] for all i, and changes to the | |
116 | * handler field. | |
117 | * Accesses to the handler field are protected by the adb_handler_lock | |
118 | * rwlock. It is held across all calls to any handler, so that by the | |
119 | * time adb_unregister returns, we know that the old handler isn't being | |
120 | * called. | |
121 | */ | |
122 | static DECLARE_MUTEX(adb_handler_sem); | |
123 | static DEFINE_RWLOCK(adb_handler_lock); | |
124 | ||
125 | #if 0 | |
126 | static void printADBreply(struct adb_request *req) | |
127 | { | |
128 | int i; | |
129 | ||
130 | printk("adb reply (%d)", req->reply_len); | |
131 | for(i = 0; i < req->reply_len; i++) | |
132 | printk(" %x", req->reply[i]); | |
133 | printk("\n"); | |
134 | ||
135 | } | |
136 | #endif | |
137 | ||
138 | ||
139 | static __inline__ void adb_wait_ms(unsigned int ms) | |
140 | { | |
141 | if (current->pid && adb_probe_task_pid && | |
142 | adb_probe_task_pid == current->pid) | |
143 | msleep(ms); | |
144 | else | |
145 | mdelay(ms); | |
146 | } | |
147 | ||
148 | static int adb_scan_bus(void) | |
149 | { | |
150 | int i, highFree=0, noMovement; | |
151 | int devmask = 0; | |
152 | struct adb_request req; | |
153 | ||
154 | /* assumes adb_handler[] is all zeroes at this point */ | |
155 | for (i = 1; i < 16; i++) { | |
156 | /* see if there is anything at address i */ | |
157 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
158 | (i << 4) | 0xf); | |
159 | if (req.reply_len > 1) | |
160 | /* one or more devices at this address */ | |
161 | adb_handler[i].original_address = i; | |
162 | else if (i > highFree) | |
163 | highFree = i; | |
164 | } | |
165 | ||
166 | /* Note we reset noMovement to 0 each time we move a device */ | |
167 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
168 | for (i = 1; i < 16; i++) { | |
169 | if (adb_handler[i].original_address == 0) | |
170 | continue; | |
171 | /* | |
172 | * Send a "talk register 3" command to address i | |
173 | * to provoke a collision if there is more than | |
174 | * one device at this address. | |
175 | */ | |
176 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
177 | (i << 4) | 0xf); | |
178 | /* | |
179 | * Move the device(s) which didn't detect a | |
180 | * collision to address `highFree'. Hopefully | |
181 | * this only moves one device. | |
182 | */ | |
183 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
184 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
185 | /* | |
186 | * See if anybody actually moved. This is suggested | |
187 | * by HW TechNote 01: | |
188 | * | |
189 | * http://developer.apple.com/technotes/hw/hw_01.html | |
190 | */ | |
191 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
192 | (highFree << 4) | 0xf); | |
193 | if (req.reply_len <= 1) continue; | |
194 | /* | |
195 | * Test whether there are any device(s) left | |
196 | * at address i. | |
197 | */ | |
198 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
199 | (i << 4) | 0xf); | |
200 | if (req.reply_len > 1) { | |
201 | /* | |
202 | * There are still one or more devices | |
203 | * left at address i. Register the one(s) | |
204 | * we moved to `highFree', and find a new | |
205 | * value for highFree. | |
206 | */ | |
207 | adb_handler[highFree].original_address = | |
208 | adb_handler[i].original_address; | |
209 | while (highFree > 0 && | |
210 | adb_handler[highFree].original_address) | |
211 | highFree--; | |
212 | if (highFree <= 0) | |
213 | break; | |
214 | ||
215 | noMovement = 0; | |
216 | } | |
217 | else { | |
218 | /* | |
219 | * No devices left at address i; move the | |
220 | * one(s) we moved to `highFree' back to i. | |
221 | */ | |
222 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
223 | (highFree << 4) | 0xb, | |
224 | (i | 0x60), 0xfe); | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
230 | printk(KERN_DEBUG "adb devices:"); | |
231 | for (i = 1; i < 16; i++) { | |
232 | if (adb_handler[i].original_address == 0) | |
233 | continue; | |
234 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
235 | (i << 4) | 0xf); | |
236 | adb_handler[i].handler_id = req.reply[2]; | |
237 | printk(" [%d]: %d %x", i, adb_handler[i].original_address, | |
238 | adb_handler[i].handler_id); | |
239 | devmask |= 1 << i; | |
240 | } | |
241 | printk("\n"); | |
242 | return devmask; | |
243 | } | |
244 | ||
245 | /* | |
246 | * This kernel task handles ADB probing. It dies once probing is | |
247 | * completed. | |
248 | */ | |
249 | static int | |
250 | adb_probe_task(void *x) | |
251 | { | |
252 | sigset_t blocked; | |
253 | ||
254 | strcpy(current->comm, "kadbprobe"); | |
255 | ||
256 | sigfillset(&blocked); | |
257 | sigprocmask(SIG_BLOCK, &blocked, NULL); | |
258 | flush_signals(current); | |
259 | ||
260 | printk(KERN_INFO "adb: starting probe task...\n"); | |
261 | do_adb_reset_bus(); | |
262 | printk(KERN_INFO "adb: finished probe task...\n"); | |
263 | ||
264 | adb_probe_task_pid = 0; | |
265 | up(&adb_probe_mutex); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static void | |
271 | __adb_probe_task(void *data) | |
272 | { | |
273 | adb_probe_task_pid = kernel_thread(adb_probe_task, NULL, SIGCHLD | CLONE_KERNEL); | |
274 | } | |
275 | ||
276 | static DECLARE_WORK(adb_reset_work, __adb_probe_task, NULL); | |
277 | ||
278 | int | |
279 | adb_reset_bus(void) | |
280 | { | |
281 | if (__adb_probe_sync) { | |
282 | do_adb_reset_bus(); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | down(&adb_probe_mutex); | |
287 | schedule_work(&adb_reset_work); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | int __init adb_init(void) | |
292 | { | |
293 | struct adb_driver *driver; | |
294 | int i; | |
295 | ||
296 | #ifdef CONFIG_PPC32 | |
297 | if ( (_machine != _MACH_chrp) && (_machine != _MACH_Pmac) ) | |
298 | return 0; | |
299 | #endif | |
300 | #ifdef CONFIG_MAC | |
301 | if (!MACH_IS_MAC) | |
302 | return 0; | |
303 | #endif | |
304 | ||
305 | /* xmon may do early-init */ | |
306 | if (adb_inited) | |
307 | return 0; | |
308 | adb_inited = 1; | |
309 | ||
310 | adb_controller = NULL; | |
311 | ||
312 | i = 0; | |
313 | while ((driver = adb_driver_list[i++]) != NULL) { | |
314 | if (!driver->probe()) { | |
315 | adb_controller = driver; | |
316 | break; | |
317 | } | |
318 | } | |
319 | if ((adb_controller == NULL) || adb_controller->init()) { | |
320 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
321 | adb_controller = NULL; | |
322 | } else { | |
8c870933 | 323 | #ifdef CONFIG_PM |
1da177e4 | 324 | pmu_register_sleep_notifier(&adb_sleep_notifier); |
8c870933 | 325 | #endif /* CONFIG_PM */ |
1da177e4 LT |
326 | #ifdef CONFIG_PPC |
327 | if (machine_is_compatible("AAPL,PowerBook1998") || | |
328 | machine_is_compatible("PowerBook1,1")) | |
329 | sleepy_trackpad = 1; | |
330 | #endif /* CONFIG_PPC */ | |
331 | init_completion(&adb_probe_task_comp); | |
332 | adbdev_init(); | |
333 | adb_reset_bus(); | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
338 | __initcall(adb_init); | |
339 | ||
8c870933 | 340 | #ifdef CONFIG_PM |
1da177e4 LT |
341 | /* |
342 | * notify clients before sleep and reset bus afterwards | |
343 | */ | |
344 | int | |
345 | adb_notify_sleep(struct pmu_sleep_notifier *self, int when) | |
346 | { | |
347 | int ret; | |
348 | ||
349 | switch (when) { | |
350 | case PBOOK_SLEEP_REQUEST: | |
351 | adb_got_sleep = 1; | |
352 | /* We need to get a lock on the probe thread */ | |
353 | down(&adb_probe_mutex); | |
354 | /* Stop autopoll */ | |
355 | if (adb_controller->autopoll) | |
356 | adb_controller->autopoll(0); | |
e041c683 AS |
357 | ret = blocking_notifier_call_chain(&adb_client_list, |
358 | ADB_MSG_POWERDOWN, NULL); | |
1da177e4 LT |
359 | if (ret & NOTIFY_STOP_MASK) { |
360 | up(&adb_probe_mutex); | |
361 | return PBOOK_SLEEP_REFUSE; | |
362 | } | |
363 | break; | |
364 | case PBOOK_SLEEP_REJECT: | |
365 | if (adb_got_sleep) { | |
366 | adb_got_sleep = 0; | |
367 | up(&adb_probe_mutex); | |
368 | adb_reset_bus(); | |
369 | } | |
370 | break; | |
371 | ||
372 | case PBOOK_SLEEP_NOW: | |
373 | break; | |
374 | case PBOOK_WAKE: | |
375 | adb_got_sleep = 0; | |
376 | up(&adb_probe_mutex); | |
377 | adb_reset_bus(); | |
378 | break; | |
379 | } | |
380 | return PBOOK_SLEEP_OK; | |
381 | } | |
8c870933 | 382 | #endif /* CONFIG_PM */ |
1da177e4 LT |
383 | |
384 | static int | |
385 | do_adb_reset_bus(void) | |
386 | { | |
387 | int ret, nret; | |
388 | ||
389 | if (adb_controller == NULL) | |
390 | return -ENXIO; | |
391 | ||
392 | if (adb_controller->autopoll) | |
393 | adb_controller->autopoll(0); | |
394 | ||
e041c683 AS |
395 | nret = blocking_notifier_call_chain(&adb_client_list, |
396 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
397 | if (nret & NOTIFY_STOP_MASK) { |
398 | if (adb_controller->autopoll) | |
399 | adb_controller->autopoll(autopoll_devs); | |
400 | return -EBUSY; | |
401 | } | |
402 | ||
403 | if (sleepy_trackpad) { | |
404 | /* Let the trackpad settle down */ | |
405 | adb_wait_ms(500); | |
406 | } | |
407 | ||
408 | down(&adb_handler_sem); | |
409 | write_lock_irq(&adb_handler_lock); | |
410 | memset(adb_handler, 0, sizeof(adb_handler)); | |
411 | write_unlock_irq(&adb_handler_lock); | |
412 | ||
413 | /* That one is still a bit synchronous, oh well... */ | |
414 | if (adb_controller->reset_bus) | |
415 | ret = adb_controller->reset_bus(); | |
416 | else | |
417 | ret = 0; | |
418 | ||
419 | if (sleepy_trackpad) { | |
420 | /* Let the trackpad settle down */ | |
421 | adb_wait_ms(1500); | |
422 | } | |
423 | ||
424 | if (!ret) { | |
425 | autopoll_devs = adb_scan_bus(); | |
426 | if (adb_controller->autopoll) | |
427 | adb_controller->autopoll(autopoll_devs); | |
428 | } | |
429 | up(&adb_handler_sem); | |
430 | ||
e041c683 AS |
431 | nret = blocking_notifier_call_chain(&adb_client_list, |
432 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
433 | if (nret & NOTIFY_STOP_MASK) |
434 | return -EBUSY; | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | void | |
440 | adb_poll(void) | |
441 | { | |
442 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
443 | return; | |
444 | adb_controller->poll(); | |
445 | } | |
446 | ||
447 | static void | |
448 | adb_probe_wakeup(struct adb_request *req) | |
449 | { | |
450 | complete(&adb_probe_task_comp); | |
451 | } | |
452 | ||
453 | /* Static request used during probe */ | |
454 | static struct adb_request adb_sreq; | |
455 | static unsigned long adb_sreq_lock; // Use semaphore ! */ | |
456 | ||
457 | int | |
458 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
459 | int flags, int nbytes, ...) | |
460 | { | |
461 | va_list list; | |
462 | int i, use_sreq; | |
463 | int rc; | |
464 | ||
465 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
466 | return -ENXIO; | |
467 | if (nbytes < 1) | |
468 | return -EINVAL; | |
469 | if (req == NULL && (flags & ADBREQ_NOSEND)) | |
470 | return -EINVAL; | |
471 | ||
472 | if (req == NULL) { | |
473 | if (test_and_set_bit(0,&adb_sreq_lock)) { | |
474 | printk("adb.c: Warning: contention on static request !\n"); | |
475 | return -EPERM; | |
476 | } | |
477 | req = &adb_sreq; | |
478 | flags |= ADBREQ_SYNC; | |
479 | use_sreq = 1; | |
480 | } else | |
481 | use_sreq = 0; | |
482 | req->nbytes = nbytes+1; | |
483 | req->done = done; | |
484 | req->reply_expected = flags & ADBREQ_REPLY; | |
485 | req->data[0] = ADB_PACKET; | |
486 | va_start(list, nbytes); | |
487 | for (i = 0; i < nbytes; ++i) | |
488 | req->data[i+1] = va_arg(list, int); | |
489 | va_end(list); | |
490 | ||
491 | if (flags & ADBREQ_NOSEND) | |
492 | return 0; | |
493 | ||
494 | /* Synchronous requests send from the probe thread cause it to | |
495 | * block. Beware that the "done" callback will be overriden ! | |
496 | */ | |
497 | if ((flags & ADBREQ_SYNC) && | |
498 | (current->pid && adb_probe_task_pid && | |
499 | adb_probe_task_pid == current->pid)) { | |
500 | req->done = adb_probe_wakeup; | |
501 | rc = adb_controller->send_request(req, 0); | |
502 | if (rc || req->complete) | |
503 | goto bail; | |
504 | wait_for_completion(&adb_probe_task_comp); | |
505 | rc = 0; | |
506 | goto bail; | |
507 | } | |
508 | ||
509 | rc = adb_controller->send_request(req, flags & ADBREQ_SYNC); | |
510 | bail: | |
511 | if (use_sreq) | |
512 | clear_bit(0, &adb_sreq_lock); | |
513 | ||
514 | return rc; | |
515 | } | |
516 | ||
517 | /* Ultimately this should return the number of devices with | |
518 | the given default id. | |
519 | And it does it now ! Note: changed behaviour: This function | |
520 | will now register if default_id _and_ handler_id both match | |
521 | but handler_id can be left to 0 to match with default_id only. | |
522 | When handler_id is set, this function will try to adjust | |
523 | the handler_id id it doesn't match. */ | |
524 | int | |
525 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
526 | void (*handler)(unsigned char *, int, struct pt_regs *, int)) | |
527 | { | |
528 | int i; | |
529 | ||
530 | down(&adb_handler_sem); | |
531 | ids->nids = 0; | |
532 | for (i = 1; i < 16; i++) { | |
533 | if ((adb_handler[i].original_address == default_id) && | |
534 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
535 | try_handler_change(i, handler_id))) { | |
536 | if (adb_handler[i].handler != 0) { | |
537 | printk(KERN_ERR | |
538 | "Two handlers for ADB device %d\n", | |
539 | default_id); | |
540 | continue; | |
541 | } | |
542 | write_lock_irq(&adb_handler_lock); | |
543 | adb_handler[i].handler = handler; | |
544 | write_unlock_irq(&adb_handler_lock); | |
545 | ids->id[ids->nids++] = i; | |
546 | } | |
547 | } | |
548 | up(&adb_handler_sem); | |
549 | return ids->nids; | |
550 | } | |
551 | ||
552 | int | |
553 | adb_unregister(int index) | |
554 | { | |
555 | int ret = -ENODEV; | |
556 | ||
557 | down(&adb_handler_sem); | |
558 | write_lock_irq(&adb_handler_lock); | |
559 | if (adb_handler[index].handler) { | |
560 | while(adb_handler[index].busy) { | |
561 | write_unlock_irq(&adb_handler_lock); | |
562 | yield(); | |
563 | write_lock_irq(&adb_handler_lock); | |
564 | } | |
565 | ret = 0; | |
566 | adb_handler[index].handler = NULL; | |
567 | } | |
568 | write_unlock_irq(&adb_handler_lock); | |
569 | up(&adb_handler_sem); | |
570 | return ret; | |
571 | } | |
572 | ||
573 | void | |
574 | adb_input(unsigned char *buf, int nb, struct pt_regs *regs, int autopoll) | |
575 | { | |
576 | int i, id; | |
577 | static int dump_adb_input = 0; | |
578 | unsigned long flags; | |
579 | ||
580 | void (*handler)(unsigned char *, int, struct pt_regs *, int); | |
581 | ||
582 | /* We skip keystrokes and mouse moves when the sleep process | |
583 | * has been started. We stop autopoll, but this is another security | |
584 | */ | |
585 | if (adb_got_sleep) | |
586 | return; | |
587 | ||
588 | id = buf[0] >> 4; | |
589 | if (dump_adb_input) { | |
590 | printk(KERN_INFO "adb packet: "); | |
591 | for (i = 0; i < nb; ++i) | |
592 | printk(" %x", buf[i]); | |
593 | printk(", id = %d\n", id); | |
594 | } | |
595 | write_lock_irqsave(&adb_handler_lock, flags); | |
596 | handler = adb_handler[id].handler; | |
597 | if (handler != NULL) | |
598 | adb_handler[id].busy = 1; | |
599 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
600 | if (handler != NULL) { | |
601 | (*handler)(buf, nb, regs, autopoll); | |
602 | wmb(); | |
603 | adb_handler[id].busy = 0; | |
604 | } | |
605 | ||
606 | } | |
607 | ||
608 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
609 | static int try_handler_change(int address, int new_id) | |
610 | { | |
611 | struct adb_request req; | |
612 | ||
613 | if (adb_handler[address].handler_id == new_id) | |
614 | return 1; | |
615 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
616 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
617 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
618 | ADB_READREG(address, 3)); | |
619 | if (req.reply_len < 2) | |
620 | return 0; | |
621 | if (req.reply[2] != new_id) | |
622 | return 0; | |
623 | adb_handler[address].handler_id = req.reply[2]; | |
624 | ||
625 | return 1; | |
626 | } | |
627 | ||
628 | int | |
629 | adb_try_handler_change(int address, int new_id) | |
630 | { | |
631 | int ret; | |
632 | ||
633 | down(&adb_handler_sem); | |
634 | ret = try_handler_change(address, new_id); | |
635 | up(&adb_handler_sem); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | int | |
640 | adb_get_infos(int address, int *original_address, int *handler_id) | |
641 | { | |
642 | down(&adb_handler_sem); | |
643 | *original_address = adb_handler[address].original_address; | |
644 | *handler_id = adb_handler[address].handler_id; | |
645 | up(&adb_handler_sem); | |
646 | ||
647 | return (*original_address != 0); | |
648 | } | |
649 | ||
650 | ||
651 | /* | |
652 | * /dev/adb device driver. | |
653 | */ | |
654 | ||
655 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
656 | ||
657 | struct adbdev_state { | |
658 | spinlock_t lock; | |
659 | atomic_t n_pending; | |
660 | struct adb_request *completed; | |
661 | wait_queue_head_t wait_queue; | |
662 | int inuse; | |
663 | }; | |
664 | ||
665 | static void adb_write_done(struct adb_request *req) | |
666 | { | |
667 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
668 | unsigned long flags; | |
669 | ||
670 | if (!req->complete) { | |
671 | req->reply_len = 0; | |
672 | req->complete = 1; | |
673 | } | |
674 | spin_lock_irqsave(&state->lock, flags); | |
675 | atomic_dec(&state->n_pending); | |
676 | if (!state->inuse) { | |
677 | kfree(req); | |
678 | if (atomic_read(&state->n_pending) == 0) { | |
679 | spin_unlock_irqrestore(&state->lock, flags); | |
680 | kfree(state); | |
681 | return; | |
682 | } | |
683 | } else { | |
684 | struct adb_request **ap = &state->completed; | |
685 | while (*ap != NULL) | |
686 | ap = &(*ap)->next; | |
687 | req->next = NULL; | |
688 | *ap = req; | |
689 | wake_up_interruptible(&state->wait_queue); | |
690 | } | |
691 | spin_unlock_irqrestore(&state->lock, flags); | |
692 | } | |
693 | ||
694 | static int | |
695 | do_adb_query(struct adb_request *req) | |
696 | { | |
697 | int ret = -EINVAL; | |
698 | ||
699 | switch(req->data[1]) | |
700 | { | |
701 | case ADB_QUERY_GETDEVINFO: | |
702 | if (req->nbytes < 3) | |
703 | break; | |
704 | down(&adb_handler_sem); | |
705 | req->reply[0] = adb_handler[req->data[2]].original_address; | |
706 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
707 | up(&adb_handler_sem); | |
708 | req->complete = 1; | |
709 | req->reply_len = 2; | |
710 | adb_write_done(req); | |
711 | ret = 0; | |
712 | break; | |
713 | } | |
714 | return ret; | |
715 | } | |
716 | ||
717 | static int adb_open(struct inode *inode, struct file *file) | |
718 | { | |
719 | struct adbdev_state *state; | |
720 | ||
721 | if (iminor(inode) > 0 || adb_controller == NULL) | |
722 | return -ENXIO; | |
723 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); | |
724 | if (state == 0) | |
725 | return -ENOMEM; | |
726 | file->private_data = state; | |
727 | spin_lock_init(&state->lock); | |
728 | atomic_set(&state->n_pending, 0); | |
729 | state->completed = NULL; | |
730 | init_waitqueue_head(&state->wait_queue); | |
731 | state->inuse = 1; | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
736 | static int adb_release(struct inode *inode, struct file *file) | |
737 | { | |
738 | struct adbdev_state *state = file->private_data; | |
739 | unsigned long flags; | |
740 | ||
741 | lock_kernel(); | |
742 | if (state) { | |
743 | file->private_data = NULL; | |
744 | spin_lock_irqsave(&state->lock, flags); | |
745 | if (atomic_read(&state->n_pending) == 0 | |
746 | && state->completed == NULL) { | |
747 | spin_unlock_irqrestore(&state->lock, flags); | |
748 | kfree(state); | |
749 | } else { | |
750 | state->inuse = 0; | |
751 | spin_unlock_irqrestore(&state->lock, flags); | |
752 | } | |
753 | } | |
754 | unlock_kernel(); | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static ssize_t adb_read(struct file *file, char __user *buf, | |
759 | size_t count, loff_t *ppos) | |
760 | { | |
761 | int ret = 0; | |
762 | struct adbdev_state *state = file->private_data; | |
763 | struct adb_request *req; | |
764 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
765 | unsigned long flags; | |
766 | ||
767 | if (count < 2) | |
768 | return -EINVAL; | |
769 | if (count > sizeof(req->reply)) | |
770 | count = sizeof(req->reply); | |
771 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
772 | return -EFAULT; | |
773 | ||
774 | req = NULL; | |
775 | spin_lock_irqsave(&state->lock, flags); | |
776 | add_wait_queue(&state->wait_queue, &wait); | |
777 | current->state = TASK_INTERRUPTIBLE; | |
778 | ||
779 | for (;;) { | |
780 | req = state->completed; | |
781 | if (req != NULL) | |
782 | state->completed = req->next; | |
783 | else if (atomic_read(&state->n_pending) == 0) | |
784 | ret = -EIO; | |
785 | if (req != NULL || ret != 0) | |
786 | break; | |
787 | ||
788 | if (file->f_flags & O_NONBLOCK) { | |
789 | ret = -EAGAIN; | |
790 | break; | |
791 | } | |
792 | if (signal_pending(current)) { | |
793 | ret = -ERESTARTSYS; | |
794 | break; | |
795 | } | |
796 | spin_unlock_irqrestore(&state->lock, flags); | |
797 | schedule(); | |
798 | spin_lock_irqsave(&state->lock, flags); | |
799 | } | |
800 | ||
801 | current->state = TASK_RUNNING; | |
802 | remove_wait_queue(&state->wait_queue, &wait); | |
803 | spin_unlock_irqrestore(&state->lock, flags); | |
804 | ||
805 | if (ret) | |
806 | return ret; | |
807 | ||
808 | ret = req->reply_len; | |
809 | if (ret > count) | |
810 | ret = count; | |
811 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
812 | ret = -EFAULT; | |
813 | ||
814 | kfree(req); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
819 | size_t count, loff_t *ppos) | |
820 | { | |
821 | int ret/*, i*/; | |
822 | struct adbdev_state *state = file->private_data; | |
823 | struct adb_request *req; | |
824 | ||
825 | if (count < 2 || count > sizeof(req->data)) | |
826 | return -EINVAL; | |
827 | if (adb_controller == NULL) | |
828 | return -ENXIO; | |
829 | if (!access_ok(VERIFY_READ, buf, count)) | |
830 | return -EFAULT; | |
831 | ||
832 | req = (struct adb_request *) kmalloc(sizeof(struct adb_request), | |
833 | GFP_KERNEL); | |
834 | if (req == NULL) | |
835 | return -ENOMEM; | |
836 | ||
837 | req->nbytes = count; | |
838 | req->done = adb_write_done; | |
839 | req->arg = (void *) state; | |
840 | req->complete = 0; | |
841 | ||
842 | ret = -EFAULT; | |
843 | if (copy_from_user(req->data, buf, count)) | |
844 | goto out; | |
845 | ||
846 | atomic_inc(&state->n_pending); | |
847 | ||
848 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
849 | down(&adb_probe_mutex); | |
850 | ||
851 | /* Queries are special requests sent to the ADB driver itself */ | |
852 | if (req->data[0] == ADB_QUERY) { | |
853 | if (count > 1) | |
854 | ret = do_adb_query(req); | |
855 | else | |
856 | ret = -EINVAL; | |
857 | up(&adb_probe_mutex); | |
858 | } | |
859 | /* Special case for ADB_BUSRESET request, all others are sent to | |
860 | the controller */ | |
861 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
862 | &&(req->data[1] == ADB_BUSRESET)) { | |
863 | ret = do_adb_reset_bus(); | |
864 | up(&adb_probe_mutex); | |
865 | atomic_dec(&state->n_pending); | |
866 | if (ret == 0) | |
867 | ret = count; | |
868 | goto out; | |
869 | } else { | |
870 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
871 | if (adb_controller && adb_controller->send_request) | |
872 | ret = adb_controller->send_request(req, 0); | |
873 | else | |
874 | ret = -ENXIO; | |
875 | up(&adb_probe_mutex); | |
876 | } | |
877 | ||
878 | if (ret != 0) { | |
879 | atomic_dec(&state->n_pending); | |
880 | goto out; | |
881 | } | |
882 | return count; | |
883 | ||
884 | out: | |
885 | kfree(req); | |
886 | return ret; | |
887 | } | |
888 | ||
889 | static struct file_operations adb_fops = { | |
890 | .owner = THIS_MODULE, | |
891 | .llseek = no_llseek, | |
892 | .read = adb_read, | |
893 | .write = adb_write, | |
894 | .open = adb_open, | |
895 | .release = adb_release, | |
896 | }; | |
897 | ||
898 | static void | |
899 | adbdev_init(void) | |
900 | { | |
901 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
902 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
903 | return; | |
904 | } | |
905 | ||
906 | devfs_mk_cdev(MKDEV(ADB_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR, "adb"); | |
907 | ||
56b22935 | 908 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
909 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 910 | return; |
53f46542 | 911 | class_device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
1da177e4 | 912 | } |