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 | ||
1da177e4 LT |
19 | #include <linux/types.h> |
20 | #include <linux/errno.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/adb.h> | |
29 | #include <linux/cuda.h> | |
30 | #include <linux/pmu.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <linux/wait.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/delay.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/completion.h> | |
37 | #include <linux/device.h> | |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/semaphore.h> | |
41 | #ifdef CONFIG_PPC | |
42 | #include <asm/prom.h> | |
e8222502 | 43 | #include <asm/machdep.h> |
1da177e4 LT |
44 | #endif |
45 | ||
46 | ||
47 | EXPORT_SYMBOL(adb_controller); | |
48 | EXPORT_SYMBOL(adb_client_list); | |
49 | ||
50 | extern struct adb_driver via_macii_driver; | |
51 | extern struct adb_driver via_maciisi_driver; | |
52 | extern struct adb_driver via_cuda_driver; | |
53 | extern struct adb_driver adb_iop_driver; | |
54 | extern struct adb_driver via_pmu_driver; | |
55 | extern struct adb_driver macio_adb_driver; | |
56 | ||
57 | static struct adb_driver *adb_driver_list[] = { | |
58 | #ifdef CONFIG_ADB_MACII | |
59 | &via_macii_driver, | |
60 | #endif | |
61 | #ifdef CONFIG_ADB_MACIISI | |
62 | &via_maciisi_driver, | |
63 | #endif | |
64 | #ifdef CONFIG_ADB_CUDA | |
65 | &via_cuda_driver, | |
66 | #endif | |
67 | #ifdef CONFIG_ADB_IOP | |
68 | &adb_iop_driver, | |
69 | #endif | |
70 | #if defined(CONFIG_ADB_PMU) || defined(CONFIG_ADB_PMU68K) | |
71 | &via_pmu_driver, | |
72 | #endif | |
73 | #ifdef CONFIG_ADB_MACIO | |
74 | &macio_adb_driver, | |
75 | #endif | |
76 | NULL | |
77 | }; | |
78 | ||
56b22935 | 79 | static struct class *adb_dev_class; |
1da177e4 LT |
80 | |
81 | struct adb_driver *adb_controller; | |
e041c683 | 82 | BLOCKING_NOTIFIER_HEAD(adb_client_list); |
1da177e4 LT |
83 | static int adb_got_sleep; |
84 | static int adb_inited; | |
85 | static pid_t adb_probe_task_pid; | |
86 | static DECLARE_MUTEX(adb_probe_mutex); | |
87 | static struct completion adb_probe_task_comp; | |
88 | static int sleepy_trackpad; | |
89 | static int autopoll_devs; | |
90 | int __adb_probe_sync; | |
91 | ||
8c870933 | 92 | #ifdef CONFIG_PM |
70b52b38 | 93 | static void adb_notify_sleep(struct pmu_sleep_notifier *self, int when); |
1da177e4 LT |
94 | static struct pmu_sleep_notifier adb_sleep_notifier = { |
95 | adb_notify_sleep, | |
96 | SLEEP_LEVEL_ADB, | |
97 | }; | |
98 | #endif | |
99 | ||
100 | static int adb_scan_bus(void); | |
101 | static int do_adb_reset_bus(void); | |
102 | static void adbdev_init(void); | |
103 | static int try_handler_change(int, int); | |
104 | ||
105 | static struct adb_handler { | |
7d12e780 | 106 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
107 | int original_address; |
108 | int handler_id; | |
109 | int busy; | |
110 | } adb_handler[16]; | |
111 | ||
112 | /* | |
113 | * The adb_handler_sem mutex protects all accesses to the original_address | |
114 | * and handler_id fields of adb_handler[i] for all i, and changes to the | |
115 | * handler field. | |
116 | * Accesses to the handler field are protected by the adb_handler_lock | |
117 | * rwlock. It is held across all calls to any handler, so that by the | |
118 | * time adb_unregister returns, we know that the old handler isn't being | |
119 | * called. | |
120 | */ | |
121 | static DECLARE_MUTEX(adb_handler_sem); | |
122 | static DEFINE_RWLOCK(adb_handler_lock); | |
123 | ||
124 | #if 0 | |
125 | static void printADBreply(struct adb_request *req) | |
126 | { | |
127 | int i; | |
128 | ||
129 | printk("adb reply (%d)", req->reply_len); | |
130 | for(i = 0; i < req->reply_len; i++) | |
131 | printk(" %x", req->reply[i]); | |
132 | printk("\n"); | |
133 | ||
134 | } | |
135 | #endif | |
136 | ||
137 | ||
138 | static __inline__ void adb_wait_ms(unsigned int ms) | |
139 | { | |
140 | if (current->pid && adb_probe_task_pid && | |
141 | adb_probe_task_pid == current->pid) | |
142 | msleep(ms); | |
143 | else | |
144 | mdelay(ms); | |
145 | } | |
146 | ||
147 | static int adb_scan_bus(void) | |
148 | { | |
149 | int i, highFree=0, noMovement; | |
150 | int devmask = 0; | |
151 | struct adb_request req; | |
152 | ||
153 | /* assumes adb_handler[] is all zeroes at this point */ | |
154 | for (i = 1; i < 16; i++) { | |
155 | /* see if there is anything at address i */ | |
156 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
157 | (i << 4) | 0xf); | |
158 | if (req.reply_len > 1) | |
159 | /* one or more devices at this address */ | |
160 | adb_handler[i].original_address = i; | |
161 | else if (i > highFree) | |
162 | highFree = i; | |
163 | } | |
164 | ||
165 | /* Note we reset noMovement to 0 each time we move a device */ | |
166 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
167 | for (i = 1; i < 16; i++) { | |
168 | if (adb_handler[i].original_address == 0) | |
169 | continue; | |
170 | /* | |
171 | * Send a "talk register 3" command to address i | |
172 | * to provoke a collision if there is more than | |
173 | * one device at this address. | |
174 | */ | |
175 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
176 | (i << 4) | 0xf); | |
177 | /* | |
178 | * Move the device(s) which didn't detect a | |
179 | * collision to address `highFree'. Hopefully | |
180 | * this only moves one device. | |
181 | */ | |
182 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
183 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
184 | /* | |
185 | * See if anybody actually moved. This is suggested | |
186 | * by HW TechNote 01: | |
187 | * | |
188 | * http://developer.apple.com/technotes/hw/hw_01.html | |
189 | */ | |
190 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
191 | (highFree << 4) | 0xf); | |
192 | if (req.reply_len <= 1) continue; | |
193 | /* | |
194 | * Test whether there are any device(s) left | |
195 | * at address i. | |
196 | */ | |
197 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
198 | (i << 4) | 0xf); | |
199 | if (req.reply_len > 1) { | |
200 | /* | |
201 | * There are still one or more devices | |
202 | * left at address i. Register the one(s) | |
203 | * we moved to `highFree', and find a new | |
204 | * value for highFree. | |
205 | */ | |
206 | adb_handler[highFree].original_address = | |
207 | adb_handler[i].original_address; | |
208 | while (highFree > 0 && | |
209 | adb_handler[highFree].original_address) | |
210 | highFree--; | |
211 | if (highFree <= 0) | |
212 | break; | |
213 | ||
214 | noMovement = 0; | |
215 | } | |
216 | else { | |
217 | /* | |
218 | * No devices left at address i; move the | |
219 | * one(s) we moved to `highFree' back to i. | |
220 | */ | |
221 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
222 | (highFree << 4) | 0xb, | |
223 | (i | 0x60), 0xfe); | |
224 | } | |
225 | } | |
226 | } | |
227 | ||
228 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
229 | printk(KERN_DEBUG "adb devices:"); | |
230 | for (i = 1; i < 16; i++) { | |
231 | if (adb_handler[i].original_address == 0) | |
232 | continue; | |
233 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
234 | (i << 4) | 0xf); | |
235 | adb_handler[i].handler_id = req.reply[2]; | |
236 | printk(" [%d]: %d %x", i, adb_handler[i].original_address, | |
237 | adb_handler[i].handler_id); | |
238 | devmask |= 1 << i; | |
239 | } | |
240 | printk("\n"); | |
241 | return devmask; | |
242 | } | |
243 | ||
244 | /* | |
245 | * This kernel task handles ADB probing. It dies once probing is | |
246 | * completed. | |
247 | */ | |
248 | static int | |
249 | adb_probe_task(void *x) | |
250 | { | |
251 | sigset_t blocked; | |
252 | ||
253 | strcpy(current->comm, "kadbprobe"); | |
254 | ||
255 | sigfillset(&blocked); | |
256 | sigprocmask(SIG_BLOCK, &blocked, NULL); | |
257 | flush_signals(current); | |
258 | ||
259 | printk(KERN_INFO "adb: starting probe task...\n"); | |
260 | do_adb_reset_bus(); | |
261 | printk(KERN_INFO "adb: finished probe task...\n"); | |
262 | ||
263 | adb_probe_task_pid = 0; | |
264 | up(&adb_probe_mutex); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static void | |
3e577a80 | 270 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 LT |
271 | { |
272 | adb_probe_task_pid = kernel_thread(adb_probe_task, NULL, SIGCHLD | CLONE_KERNEL); | |
273 | } | |
274 | ||
3e577a80 | 275 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
276 | |
277 | int | |
278 | adb_reset_bus(void) | |
279 | { | |
280 | if (__adb_probe_sync) { | |
281 | do_adb_reset_bus(); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | down(&adb_probe_mutex); | |
286 | schedule_work(&adb_reset_work); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | int __init adb_init(void) | |
291 | { | |
292 | struct adb_driver *driver; | |
293 | int i; | |
294 | ||
295 | #ifdef CONFIG_PPC32 | |
e8222502 | 296 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
297 | return 0; |
298 | #endif | |
299 | #ifdef CONFIG_MAC | |
300 | if (!MACH_IS_MAC) | |
301 | return 0; | |
302 | #endif | |
303 | ||
304 | /* xmon may do early-init */ | |
305 | if (adb_inited) | |
306 | return 0; | |
307 | adb_inited = 1; | |
308 | ||
309 | adb_controller = NULL; | |
310 | ||
311 | i = 0; | |
312 | while ((driver = adb_driver_list[i++]) != NULL) { | |
313 | if (!driver->probe()) { | |
314 | adb_controller = driver; | |
315 | break; | |
316 | } | |
317 | } | |
318 | if ((adb_controller == NULL) || adb_controller->init()) { | |
319 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
320 | adb_controller = NULL; | |
321 | } else { | |
8c870933 | 322 | #ifdef CONFIG_PM |
1da177e4 | 323 | pmu_register_sleep_notifier(&adb_sleep_notifier); |
8c870933 | 324 | #endif /* CONFIG_PM */ |
1da177e4 LT |
325 | #ifdef CONFIG_PPC |
326 | if (machine_is_compatible("AAPL,PowerBook1998") || | |
327 | machine_is_compatible("PowerBook1,1")) | |
328 | sleepy_trackpad = 1; | |
329 | #endif /* CONFIG_PPC */ | |
330 | init_completion(&adb_probe_task_comp); | |
331 | adbdev_init(); | |
332 | adb_reset_bus(); | |
333 | } | |
334 | return 0; | |
335 | } | |
336 | ||
337 | __initcall(adb_init); | |
338 | ||
8c870933 | 339 | #ifdef CONFIG_PM |
1da177e4 LT |
340 | /* |
341 | * notify clients before sleep and reset bus afterwards | |
342 | */ | |
70b52b38 | 343 | void |
1da177e4 LT |
344 | adb_notify_sleep(struct pmu_sleep_notifier *self, int when) |
345 | { | |
1da177e4 LT |
346 | switch (when) { |
347 | case PBOOK_SLEEP_REQUEST: | |
348 | adb_got_sleep = 1; | |
349 | /* We need to get a lock on the probe thread */ | |
350 | down(&adb_probe_mutex); | |
351 | /* Stop autopoll */ | |
352 | if (adb_controller->autopoll) | |
353 | adb_controller->autopoll(0); | |
70b52b38 JB |
354 | blocking_notifier_call_chain(&adb_client_list, |
355 | ADB_MSG_POWERDOWN, NULL); | |
1da177e4 LT |
356 | break; |
357 | case PBOOK_WAKE: | |
358 | adb_got_sleep = 0; | |
359 | up(&adb_probe_mutex); | |
360 | adb_reset_bus(); | |
361 | break; | |
362 | } | |
1da177e4 | 363 | } |
8c870933 | 364 | #endif /* CONFIG_PM */ |
1da177e4 LT |
365 | |
366 | static int | |
367 | do_adb_reset_bus(void) | |
368 | { | |
70b52b38 | 369 | int ret; |
1da177e4 LT |
370 | |
371 | if (adb_controller == NULL) | |
372 | return -ENXIO; | |
373 | ||
374 | if (adb_controller->autopoll) | |
375 | adb_controller->autopoll(0); | |
376 | ||
70b52b38 JB |
377 | blocking_notifier_call_chain(&adb_client_list, |
378 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
379 | |
380 | if (sleepy_trackpad) { | |
381 | /* Let the trackpad settle down */ | |
382 | adb_wait_ms(500); | |
383 | } | |
384 | ||
385 | down(&adb_handler_sem); | |
386 | write_lock_irq(&adb_handler_lock); | |
387 | memset(adb_handler, 0, sizeof(adb_handler)); | |
388 | write_unlock_irq(&adb_handler_lock); | |
389 | ||
390 | /* That one is still a bit synchronous, oh well... */ | |
391 | if (adb_controller->reset_bus) | |
392 | ret = adb_controller->reset_bus(); | |
393 | else | |
394 | ret = 0; | |
395 | ||
396 | if (sleepy_trackpad) { | |
397 | /* Let the trackpad settle down */ | |
398 | adb_wait_ms(1500); | |
399 | } | |
400 | ||
401 | if (!ret) { | |
402 | autopoll_devs = adb_scan_bus(); | |
403 | if (adb_controller->autopoll) | |
404 | adb_controller->autopoll(autopoll_devs); | |
405 | } | |
406 | up(&adb_handler_sem); | |
407 | ||
70b52b38 JB |
408 | blocking_notifier_call_chain(&adb_client_list, |
409 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
410 | |
411 | return ret; | |
412 | } | |
413 | ||
414 | void | |
415 | adb_poll(void) | |
416 | { | |
417 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
418 | return; | |
419 | adb_controller->poll(); | |
420 | } | |
421 | ||
422 | static void | |
423 | adb_probe_wakeup(struct adb_request *req) | |
424 | { | |
425 | complete(&adb_probe_task_comp); | |
426 | } | |
427 | ||
428 | /* Static request used during probe */ | |
429 | static struct adb_request adb_sreq; | |
430 | static unsigned long adb_sreq_lock; // Use semaphore ! */ | |
431 | ||
432 | int | |
433 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
434 | int flags, int nbytes, ...) | |
435 | { | |
436 | va_list list; | |
437 | int i, use_sreq; | |
438 | int rc; | |
439 | ||
440 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
441 | return -ENXIO; | |
442 | if (nbytes < 1) | |
443 | return -EINVAL; | |
444 | if (req == NULL && (flags & ADBREQ_NOSEND)) | |
445 | return -EINVAL; | |
446 | ||
447 | if (req == NULL) { | |
448 | if (test_and_set_bit(0,&adb_sreq_lock)) { | |
449 | printk("adb.c: Warning: contention on static request !\n"); | |
450 | return -EPERM; | |
451 | } | |
452 | req = &adb_sreq; | |
453 | flags |= ADBREQ_SYNC; | |
454 | use_sreq = 1; | |
455 | } else | |
456 | use_sreq = 0; | |
457 | req->nbytes = nbytes+1; | |
458 | req->done = done; | |
459 | req->reply_expected = flags & ADBREQ_REPLY; | |
460 | req->data[0] = ADB_PACKET; | |
461 | va_start(list, nbytes); | |
462 | for (i = 0; i < nbytes; ++i) | |
463 | req->data[i+1] = va_arg(list, int); | |
464 | va_end(list); | |
465 | ||
466 | if (flags & ADBREQ_NOSEND) | |
467 | return 0; | |
468 | ||
469 | /* Synchronous requests send from the probe thread cause it to | |
470 | * block. Beware that the "done" callback will be overriden ! | |
471 | */ | |
472 | if ((flags & ADBREQ_SYNC) && | |
473 | (current->pid && adb_probe_task_pid && | |
474 | adb_probe_task_pid == current->pid)) { | |
475 | req->done = adb_probe_wakeup; | |
476 | rc = adb_controller->send_request(req, 0); | |
477 | if (rc || req->complete) | |
478 | goto bail; | |
479 | wait_for_completion(&adb_probe_task_comp); | |
480 | rc = 0; | |
481 | goto bail; | |
482 | } | |
483 | ||
484 | rc = adb_controller->send_request(req, flags & ADBREQ_SYNC); | |
485 | bail: | |
486 | if (use_sreq) | |
487 | clear_bit(0, &adb_sreq_lock); | |
488 | ||
489 | return rc; | |
490 | } | |
491 | ||
492 | /* Ultimately this should return the number of devices with | |
493 | the given default id. | |
494 | And it does it now ! Note: changed behaviour: This function | |
495 | will now register if default_id _and_ handler_id both match | |
496 | but handler_id can be left to 0 to match with default_id only. | |
497 | When handler_id is set, this function will try to adjust | |
498 | the handler_id id it doesn't match. */ | |
499 | int | |
500 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 501 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
502 | { |
503 | int i; | |
504 | ||
505 | down(&adb_handler_sem); | |
506 | ids->nids = 0; | |
507 | for (i = 1; i < 16; i++) { | |
508 | if ((adb_handler[i].original_address == default_id) && | |
509 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
510 | try_handler_change(i, handler_id))) { | |
511 | if (adb_handler[i].handler != 0) { | |
512 | printk(KERN_ERR | |
513 | "Two handlers for ADB device %d\n", | |
514 | default_id); | |
515 | continue; | |
516 | } | |
517 | write_lock_irq(&adb_handler_lock); | |
518 | adb_handler[i].handler = handler; | |
519 | write_unlock_irq(&adb_handler_lock); | |
520 | ids->id[ids->nids++] = i; | |
521 | } | |
522 | } | |
523 | up(&adb_handler_sem); | |
524 | return ids->nids; | |
525 | } | |
526 | ||
527 | int | |
528 | adb_unregister(int index) | |
529 | { | |
530 | int ret = -ENODEV; | |
531 | ||
532 | down(&adb_handler_sem); | |
533 | write_lock_irq(&adb_handler_lock); | |
534 | if (adb_handler[index].handler) { | |
535 | while(adb_handler[index].busy) { | |
536 | write_unlock_irq(&adb_handler_lock); | |
537 | yield(); | |
538 | write_lock_irq(&adb_handler_lock); | |
539 | } | |
540 | ret = 0; | |
541 | adb_handler[index].handler = NULL; | |
542 | } | |
543 | write_unlock_irq(&adb_handler_lock); | |
544 | up(&adb_handler_sem); | |
545 | return ret; | |
546 | } | |
547 | ||
548 | void | |
7d12e780 | 549 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
550 | { |
551 | int i, id; | |
552 | static int dump_adb_input = 0; | |
553 | unsigned long flags; | |
554 | ||
7d12e780 | 555 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
556 | |
557 | /* We skip keystrokes and mouse moves when the sleep process | |
558 | * has been started. We stop autopoll, but this is another security | |
559 | */ | |
560 | if (adb_got_sleep) | |
561 | return; | |
562 | ||
563 | id = buf[0] >> 4; | |
564 | if (dump_adb_input) { | |
565 | printk(KERN_INFO "adb packet: "); | |
566 | for (i = 0; i < nb; ++i) | |
567 | printk(" %x", buf[i]); | |
568 | printk(", id = %d\n", id); | |
569 | } | |
570 | write_lock_irqsave(&adb_handler_lock, flags); | |
571 | handler = adb_handler[id].handler; | |
572 | if (handler != NULL) | |
573 | adb_handler[id].busy = 1; | |
574 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
575 | if (handler != NULL) { | |
7d12e780 | 576 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
577 | wmb(); |
578 | adb_handler[id].busy = 0; | |
579 | } | |
580 | ||
581 | } | |
582 | ||
583 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
584 | static int try_handler_change(int address, int new_id) | |
585 | { | |
586 | struct adb_request req; | |
587 | ||
588 | if (adb_handler[address].handler_id == new_id) | |
589 | return 1; | |
590 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
591 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
592 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
593 | ADB_READREG(address, 3)); | |
594 | if (req.reply_len < 2) | |
595 | return 0; | |
596 | if (req.reply[2] != new_id) | |
597 | return 0; | |
598 | adb_handler[address].handler_id = req.reply[2]; | |
599 | ||
600 | return 1; | |
601 | } | |
602 | ||
603 | int | |
604 | adb_try_handler_change(int address, int new_id) | |
605 | { | |
606 | int ret; | |
607 | ||
608 | down(&adb_handler_sem); | |
609 | ret = try_handler_change(address, new_id); | |
610 | up(&adb_handler_sem); | |
611 | return ret; | |
612 | } | |
613 | ||
614 | int | |
615 | adb_get_infos(int address, int *original_address, int *handler_id) | |
616 | { | |
617 | down(&adb_handler_sem); | |
618 | *original_address = adb_handler[address].original_address; | |
619 | *handler_id = adb_handler[address].handler_id; | |
620 | up(&adb_handler_sem); | |
621 | ||
622 | return (*original_address != 0); | |
623 | } | |
624 | ||
625 | ||
626 | /* | |
627 | * /dev/adb device driver. | |
628 | */ | |
629 | ||
630 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
631 | ||
632 | struct adbdev_state { | |
633 | spinlock_t lock; | |
634 | atomic_t n_pending; | |
635 | struct adb_request *completed; | |
636 | wait_queue_head_t wait_queue; | |
637 | int inuse; | |
638 | }; | |
639 | ||
640 | static void adb_write_done(struct adb_request *req) | |
641 | { | |
642 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
643 | unsigned long flags; | |
644 | ||
645 | if (!req->complete) { | |
646 | req->reply_len = 0; | |
647 | req->complete = 1; | |
648 | } | |
649 | spin_lock_irqsave(&state->lock, flags); | |
650 | atomic_dec(&state->n_pending); | |
651 | if (!state->inuse) { | |
652 | kfree(req); | |
653 | if (atomic_read(&state->n_pending) == 0) { | |
654 | spin_unlock_irqrestore(&state->lock, flags); | |
655 | kfree(state); | |
656 | return; | |
657 | } | |
658 | } else { | |
659 | struct adb_request **ap = &state->completed; | |
660 | while (*ap != NULL) | |
661 | ap = &(*ap)->next; | |
662 | req->next = NULL; | |
663 | *ap = req; | |
664 | wake_up_interruptible(&state->wait_queue); | |
665 | } | |
666 | spin_unlock_irqrestore(&state->lock, flags); | |
667 | } | |
668 | ||
669 | static int | |
670 | do_adb_query(struct adb_request *req) | |
671 | { | |
672 | int ret = -EINVAL; | |
673 | ||
674 | switch(req->data[1]) | |
675 | { | |
676 | case ADB_QUERY_GETDEVINFO: | |
677 | if (req->nbytes < 3) | |
678 | break; | |
679 | down(&adb_handler_sem); | |
680 | req->reply[0] = adb_handler[req->data[2]].original_address; | |
681 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
682 | up(&adb_handler_sem); | |
683 | req->complete = 1; | |
684 | req->reply_len = 2; | |
685 | adb_write_done(req); | |
686 | ret = 0; | |
687 | break; | |
688 | } | |
689 | return ret; | |
690 | } | |
691 | ||
692 | static int adb_open(struct inode *inode, struct file *file) | |
693 | { | |
694 | struct adbdev_state *state; | |
695 | ||
696 | if (iminor(inode) > 0 || adb_controller == NULL) | |
697 | return -ENXIO; | |
698 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); | |
699 | if (state == 0) | |
700 | return -ENOMEM; | |
701 | file->private_data = state; | |
702 | spin_lock_init(&state->lock); | |
703 | atomic_set(&state->n_pending, 0); | |
704 | state->completed = NULL; | |
705 | init_waitqueue_head(&state->wait_queue); | |
706 | state->inuse = 1; | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static int adb_release(struct inode *inode, struct file *file) | |
712 | { | |
713 | struct adbdev_state *state = file->private_data; | |
714 | unsigned long flags; | |
715 | ||
716 | lock_kernel(); | |
717 | if (state) { | |
718 | file->private_data = NULL; | |
719 | spin_lock_irqsave(&state->lock, flags); | |
720 | if (atomic_read(&state->n_pending) == 0 | |
721 | && state->completed == NULL) { | |
722 | spin_unlock_irqrestore(&state->lock, flags); | |
723 | kfree(state); | |
724 | } else { | |
725 | state->inuse = 0; | |
726 | spin_unlock_irqrestore(&state->lock, flags); | |
727 | } | |
728 | } | |
729 | unlock_kernel(); | |
730 | return 0; | |
731 | } | |
732 | ||
733 | static ssize_t adb_read(struct file *file, char __user *buf, | |
734 | size_t count, loff_t *ppos) | |
735 | { | |
736 | int ret = 0; | |
737 | struct adbdev_state *state = file->private_data; | |
738 | struct adb_request *req; | |
739 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
740 | unsigned long flags; | |
741 | ||
742 | if (count < 2) | |
743 | return -EINVAL; | |
744 | if (count > sizeof(req->reply)) | |
745 | count = sizeof(req->reply); | |
746 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
747 | return -EFAULT; | |
748 | ||
749 | req = NULL; | |
750 | spin_lock_irqsave(&state->lock, flags); | |
751 | add_wait_queue(&state->wait_queue, &wait); | |
752 | current->state = TASK_INTERRUPTIBLE; | |
753 | ||
754 | for (;;) { | |
755 | req = state->completed; | |
756 | if (req != NULL) | |
757 | state->completed = req->next; | |
758 | else if (atomic_read(&state->n_pending) == 0) | |
759 | ret = -EIO; | |
760 | if (req != NULL || ret != 0) | |
761 | break; | |
762 | ||
763 | if (file->f_flags & O_NONBLOCK) { | |
764 | ret = -EAGAIN; | |
765 | break; | |
766 | } | |
767 | if (signal_pending(current)) { | |
768 | ret = -ERESTARTSYS; | |
769 | break; | |
770 | } | |
771 | spin_unlock_irqrestore(&state->lock, flags); | |
772 | schedule(); | |
773 | spin_lock_irqsave(&state->lock, flags); | |
774 | } | |
775 | ||
776 | current->state = TASK_RUNNING; | |
777 | remove_wait_queue(&state->wait_queue, &wait); | |
778 | spin_unlock_irqrestore(&state->lock, flags); | |
779 | ||
780 | if (ret) | |
781 | return ret; | |
782 | ||
783 | ret = req->reply_len; | |
784 | if (ret > count) | |
785 | ret = count; | |
786 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
787 | ret = -EFAULT; | |
788 | ||
789 | kfree(req); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
794 | size_t count, loff_t *ppos) | |
795 | { | |
796 | int ret/*, i*/; | |
797 | struct adbdev_state *state = file->private_data; | |
798 | struct adb_request *req; | |
799 | ||
800 | if (count < 2 || count > sizeof(req->data)) | |
801 | return -EINVAL; | |
802 | if (adb_controller == NULL) | |
803 | return -ENXIO; | |
804 | if (!access_ok(VERIFY_READ, buf, count)) | |
805 | return -EFAULT; | |
806 | ||
5cbded58 | 807 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
808 | GFP_KERNEL); |
809 | if (req == NULL) | |
810 | return -ENOMEM; | |
811 | ||
812 | req->nbytes = count; | |
813 | req->done = adb_write_done; | |
814 | req->arg = (void *) state; | |
815 | req->complete = 0; | |
816 | ||
817 | ret = -EFAULT; | |
818 | if (copy_from_user(req->data, buf, count)) | |
819 | goto out; | |
820 | ||
821 | atomic_inc(&state->n_pending); | |
822 | ||
823 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
824 | down(&adb_probe_mutex); | |
825 | ||
826 | /* Queries are special requests sent to the ADB driver itself */ | |
827 | if (req->data[0] == ADB_QUERY) { | |
828 | if (count > 1) | |
829 | ret = do_adb_query(req); | |
830 | else | |
831 | ret = -EINVAL; | |
832 | up(&adb_probe_mutex); | |
833 | } | |
834 | /* Special case for ADB_BUSRESET request, all others are sent to | |
835 | the controller */ | |
836 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
837 | &&(req->data[1] == ADB_BUSRESET)) { | |
838 | ret = do_adb_reset_bus(); | |
839 | up(&adb_probe_mutex); | |
840 | atomic_dec(&state->n_pending); | |
841 | if (ret == 0) | |
842 | ret = count; | |
843 | goto out; | |
844 | } else { | |
845 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
846 | if (adb_controller && adb_controller->send_request) | |
847 | ret = adb_controller->send_request(req, 0); | |
848 | else | |
849 | ret = -ENXIO; | |
850 | up(&adb_probe_mutex); | |
851 | } | |
852 | ||
853 | if (ret != 0) { | |
854 | atomic_dec(&state->n_pending); | |
855 | goto out; | |
856 | } | |
857 | return count; | |
858 | ||
859 | out: | |
860 | kfree(req); | |
861 | return ret; | |
862 | } | |
863 | ||
fa027c2a | 864 | static const struct file_operations adb_fops = { |
1da177e4 LT |
865 | .owner = THIS_MODULE, |
866 | .llseek = no_llseek, | |
867 | .read = adb_read, | |
868 | .write = adb_write, | |
869 | .open = adb_open, | |
870 | .release = adb_release, | |
871 | }; | |
872 | ||
873 | static void | |
874 | adbdev_init(void) | |
875 | { | |
876 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
877 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
878 | return; | |
879 | } | |
880 | ||
56b22935 | 881 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
882 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 883 | return; |
53f46542 | 884 | class_device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
1da177e4 | 885 | } |