Commit | Line | Data |
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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 | ||
e120e8d0 | 92 | #ifdef CONFIG_PM_SLEEP |
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 | { | |
1da177e4 LT |
251 | strcpy(current->comm, "kadbprobe"); |
252 | ||
1da177e4 LT |
253 | printk(KERN_INFO "adb: starting probe task...\n"); |
254 | do_adb_reset_bus(); | |
255 | printk(KERN_INFO "adb: finished probe task...\n"); | |
1b6dd9ba | 256 | |
1da177e4 LT |
257 | adb_probe_task_pid = 0; |
258 | up(&adb_probe_mutex); | |
1b6dd9ba | 259 | |
1da177e4 LT |
260 | return 0; |
261 | } | |
262 | ||
263 | static void | |
3e577a80 | 264 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 LT |
265 | { |
266 | adb_probe_task_pid = kernel_thread(adb_probe_task, NULL, SIGCHLD | CLONE_KERNEL); | |
267 | } | |
268 | ||
3e577a80 | 269 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
270 | |
271 | int | |
272 | adb_reset_bus(void) | |
273 | { | |
274 | if (__adb_probe_sync) { | |
275 | do_adb_reset_bus(); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | down(&adb_probe_mutex); | |
280 | schedule_work(&adb_reset_work); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | int __init adb_init(void) | |
285 | { | |
286 | struct adb_driver *driver; | |
287 | int i; | |
288 | ||
289 | #ifdef CONFIG_PPC32 | |
e8222502 | 290 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
291 | return 0; |
292 | #endif | |
293 | #ifdef CONFIG_MAC | |
294 | if (!MACH_IS_MAC) | |
295 | return 0; | |
296 | #endif | |
297 | ||
298 | /* xmon may do early-init */ | |
299 | if (adb_inited) | |
300 | return 0; | |
301 | adb_inited = 1; | |
302 | ||
303 | adb_controller = NULL; | |
304 | ||
305 | i = 0; | |
306 | while ((driver = adb_driver_list[i++]) != NULL) { | |
307 | if (!driver->probe()) { | |
308 | adb_controller = driver; | |
309 | break; | |
310 | } | |
311 | } | |
312 | if ((adb_controller == NULL) || adb_controller->init()) { | |
313 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
314 | adb_controller = NULL; | |
315 | } else { | |
e120e8d0 | 316 | #ifdef CONFIG_PM_SLEEP |
1da177e4 | 317 | pmu_register_sleep_notifier(&adb_sleep_notifier); |
8c870933 | 318 | #endif /* CONFIG_PM */ |
1da177e4 LT |
319 | #ifdef CONFIG_PPC |
320 | if (machine_is_compatible("AAPL,PowerBook1998") || | |
321 | machine_is_compatible("PowerBook1,1")) | |
322 | sleepy_trackpad = 1; | |
323 | #endif /* CONFIG_PPC */ | |
324 | init_completion(&adb_probe_task_comp); | |
325 | adbdev_init(); | |
326 | adb_reset_bus(); | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | __initcall(adb_init); | |
332 | ||
8c870933 | 333 | #ifdef CONFIG_PM |
1da177e4 LT |
334 | /* |
335 | * notify clients before sleep and reset bus afterwards | |
336 | */ | |
70b52b38 | 337 | void |
1da177e4 LT |
338 | adb_notify_sleep(struct pmu_sleep_notifier *self, int when) |
339 | { | |
1da177e4 LT |
340 | switch (when) { |
341 | case PBOOK_SLEEP_REQUEST: | |
342 | adb_got_sleep = 1; | |
343 | /* We need to get a lock on the probe thread */ | |
344 | down(&adb_probe_mutex); | |
345 | /* Stop autopoll */ | |
346 | if (adb_controller->autopoll) | |
347 | adb_controller->autopoll(0); | |
70b52b38 JB |
348 | blocking_notifier_call_chain(&adb_client_list, |
349 | ADB_MSG_POWERDOWN, NULL); | |
1da177e4 LT |
350 | break; |
351 | case PBOOK_WAKE: | |
352 | adb_got_sleep = 0; | |
353 | up(&adb_probe_mutex); | |
354 | adb_reset_bus(); | |
355 | break; | |
356 | } | |
1da177e4 | 357 | } |
8c870933 | 358 | #endif /* CONFIG_PM */ |
1da177e4 LT |
359 | |
360 | static int | |
361 | do_adb_reset_bus(void) | |
362 | { | |
70b52b38 | 363 | int ret; |
1da177e4 LT |
364 | |
365 | if (adb_controller == NULL) | |
366 | return -ENXIO; | |
367 | ||
368 | if (adb_controller->autopoll) | |
369 | adb_controller->autopoll(0); | |
370 | ||
70b52b38 JB |
371 | blocking_notifier_call_chain(&adb_client_list, |
372 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
373 | |
374 | if (sleepy_trackpad) { | |
375 | /* Let the trackpad settle down */ | |
376 | adb_wait_ms(500); | |
377 | } | |
378 | ||
379 | down(&adb_handler_sem); | |
380 | write_lock_irq(&adb_handler_lock); | |
381 | memset(adb_handler, 0, sizeof(adb_handler)); | |
382 | write_unlock_irq(&adb_handler_lock); | |
383 | ||
384 | /* That one is still a bit synchronous, oh well... */ | |
385 | if (adb_controller->reset_bus) | |
386 | ret = adb_controller->reset_bus(); | |
387 | else | |
388 | ret = 0; | |
389 | ||
390 | if (sleepy_trackpad) { | |
391 | /* Let the trackpad settle down */ | |
392 | adb_wait_ms(1500); | |
393 | } | |
394 | ||
395 | if (!ret) { | |
396 | autopoll_devs = adb_scan_bus(); | |
397 | if (adb_controller->autopoll) | |
398 | adb_controller->autopoll(autopoll_devs); | |
399 | } | |
400 | up(&adb_handler_sem); | |
401 | ||
70b52b38 JB |
402 | blocking_notifier_call_chain(&adb_client_list, |
403 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
404 | |
405 | return ret; | |
406 | } | |
407 | ||
408 | void | |
409 | adb_poll(void) | |
410 | { | |
411 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
412 | return; | |
413 | adb_controller->poll(); | |
414 | } | |
415 | ||
416 | static void | |
417 | adb_probe_wakeup(struct adb_request *req) | |
418 | { | |
419 | complete(&adb_probe_task_comp); | |
420 | } | |
421 | ||
422 | /* Static request used during probe */ | |
423 | static struct adb_request adb_sreq; | |
424 | static unsigned long adb_sreq_lock; // Use semaphore ! */ | |
425 | ||
426 | int | |
427 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
428 | int flags, int nbytes, ...) | |
429 | { | |
430 | va_list list; | |
431 | int i, use_sreq; | |
432 | int rc; | |
433 | ||
434 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
435 | return -ENXIO; | |
436 | if (nbytes < 1) | |
437 | return -EINVAL; | |
438 | if (req == NULL && (flags & ADBREQ_NOSEND)) | |
439 | return -EINVAL; | |
440 | ||
441 | if (req == NULL) { | |
442 | if (test_and_set_bit(0,&adb_sreq_lock)) { | |
443 | printk("adb.c: Warning: contention on static request !\n"); | |
444 | return -EPERM; | |
445 | } | |
446 | req = &adb_sreq; | |
447 | flags |= ADBREQ_SYNC; | |
448 | use_sreq = 1; | |
449 | } else | |
450 | use_sreq = 0; | |
451 | req->nbytes = nbytes+1; | |
452 | req->done = done; | |
453 | req->reply_expected = flags & ADBREQ_REPLY; | |
454 | req->data[0] = ADB_PACKET; | |
455 | va_start(list, nbytes); | |
456 | for (i = 0; i < nbytes; ++i) | |
457 | req->data[i+1] = va_arg(list, int); | |
458 | va_end(list); | |
459 | ||
460 | if (flags & ADBREQ_NOSEND) | |
461 | return 0; | |
462 | ||
463 | /* Synchronous requests send from the probe thread cause it to | |
464 | * block. Beware that the "done" callback will be overriden ! | |
465 | */ | |
466 | if ((flags & ADBREQ_SYNC) && | |
467 | (current->pid && adb_probe_task_pid && | |
468 | adb_probe_task_pid == current->pid)) { | |
469 | req->done = adb_probe_wakeup; | |
470 | rc = adb_controller->send_request(req, 0); | |
471 | if (rc || req->complete) | |
472 | goto bail; | |
473 | wait_for_completion(&adb_probe_task_comp); | |
474 | rc = 0; | |
475 | goto bail; | |
476 | } | |
477 | ||
478 | rc = adb_controller->send_request(req, flags & ADBREQ_SYNC); | |
479 | bail: | |
480 | if (use_sreq) | |
481 | clear_bit(0, &adb_sreq_lock); | |
482 | ||
483 | return rc; | |
484 | } | |
485 | ||
486 | /* Ultimately this should return the number of devices with | |
487 | the given default id. | |
488 | And it does it now ! Note: changed behaviour: This function | |
489 | will now register if default_id _and_ handler_id both match | |
490 | but handler_id can be left to 0 to match with default_id only. | |
491 | When handler_id is set, this function will try to adjust | |
492 | the handler_id id it doesn't match. */ | |
493 | int | |
494 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 495 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
496 | { |
497 | int i; | |
498 | ||
499 | down(&adb_handler_sem); | |
500 | ids->nids = 0; | |
501 | for (i = 1; i < 16; i++) { | |
502 | if ((adb_handler[i].original_address == default_id) && | |
503 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
504 | try_handler_change(i, handler_id))) { | |
505 | if (adb_handler[i].handler != 0) { | |
506 | printk(KERN_ERR | |
507 | "Two handlers for ADB device %d\n", | |
508 | default_id); | |
509 | continue; | |
510 | } | |
511 | write_lock_irq(&adb_handler_lock); | |
512 | adb_handler[i].handler = handler; | |
513 | write_unlock_irq(&adb_handler_lock); | |
514 | ids->id[ids->nids++] = i; | |
515 | } | |
516 | } | |
517 | up(&adb_handler_sem); | |
518 | return ids->nids; | |
519 | } | |
520 | ||
521 | int | |
522 | adb_unregister(int index) | |
523 | { | |
524 | int ret = -ENODEV; | |
525 | ||
526 | down(&adb_handler_sem); | |
527 | write_lock_irq(&adb_handler_lock); | |
528 | if (adb_handler[index].handler) { | |
529 | while(adb_handler[index].busy) { | |
530 | write_unlock_irq(&adb_handler_lock); | |
531 | yield(); | |
532 | write_lock_irq(&adb_handler_lock); | |
533 | } | |
534 | ret = 0; | |
535 | adb_handler[index].handler = NULL; | |
536 | } | |
537 | write_unlock_irq(&adb_handler_lock); | |
538 | up(&adb_handler_sem); | |
539 | return ret; | |
540 | } | |
541 | ||
542 | void | |
7d12e780 | 543 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
544 | { |
545 | int i, id; | |
546 | static int dump_adb_input = 0; | |
547 | unsigned long flags; | |
548 | ||
7d12e780 | 549 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
550 | |
551 | /* We skip keystrokes and mouse moves when the sleep process | |
552 | * has been started. We stop autopoll, but this is another security | |
553 | */ | |
554 | if (adb_got_sleep) | |
555 | return; | |
556 | ||
557 | id = buf[0] >> 4; | |
558 | if (dump_adb_input) { | |
559 | printk(KERN_INFO "adb packet: "); | |
560 | for (i = 0; i < nb; ++i) | |
561 | printk(" %x", buf[i]); | |
562 | printk(", id = %d\n", id); | |
563 | } | |
564 | write_lock_irqsave(&adb_handler_lock, flags); | |
565 | handler = adb_handler[id].handler; | |
566 | if (handler != NULL) | |
567 | adb_handler[id].busy = 1; | |
568 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
569 | if (handler != NULL) { | |
7d12e780 | 570 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
571 | wmb(); |
572 | adb_handler[id].busy = 0; | |
573 | } | |
574 | ||
575 | } | |
576 | ||
577 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
578 | static int try_handler_change(int address, int new_id) | |
579 | { | |
580 | struct adb_request req; | |
581 | ||
582 | if (adb_handler[address].handler_id == new_id) | |
583 | return 1; | |
584 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
585 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
586 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
587 | ADB_READREG(address, 3)); | |
588 | if (req.reply_len < 2) | |
589 | return 0; | |
590 | if (req.reply[2] != new_id) | |
591 | return 0; | |
592 | adb_handler[address].handler_id = req.reply[2]; | |
593 | ||
594 | return 1; | |
595 | } | |
596 | ||
597 | int | |
598 | adb_try_handler_change(int address, int new_id) | |
599 | { | |
600 | int ret; | |
601 | ||
602 | down(&adb_handler_sem); | |
603 | ret = try_handler_change(address, new_id); | |
604 | up(&adb_handler_sem); | |
605 | return ret; | |
606 | } | |
607 | ||
608 | int | |
609 | adb_get_infos(int address, int *original_address, int *handler_id) | |
610 | { | |
611 | down(&adb_handler_sem); | |
612 | *original_address = adb_handler[address].original_address; | |
613 | *handler_id = adb_handler[address].handler_id; | |
614 | up(&adb_handler_sem); | |
615 | ||
616 | return (*original_address != 0); | |
617 | } | |
618 | ||
619 | ||
620 | /* | |
621 | * /dev/adb device driver. | |
622 | */ | |
623 | ||
624 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
625 | ||
626 | struct adbdev_state { | |
627 | spinlock_t lock; | |
628 | atomic_t n_pending; | |
629 | struct adb_request *completed; | |
630 | wait_queue_head_t wait_queue; | |
631 | int inuse; | |
632 | }; | |
633 | ||
634 | static void adb_write_done(struct adb_request *req) | |
635 | { | |
636 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
637 | unsigned long flags; | |
638 | ||
639 | if (!req->complete) { | |
640 | req->reply_len = 0; | |
641 | req->complete = 1; | |
642 | } | |
643 | spin_lock_irqsave(&state->lock, flags); | |
644 | atomic_dec(&state->n_pending); | |
645 | if (!state->inuse) { | |
646 | kfree(req); | |
647 | if (atomic_read(&state->n_pending) == 0) { | |
648 | spin_unlock_irqrestore(&state->lock, flags); | |
649 | kfree(state); | |
650 | return; | |
651 | } | |
652 | } else { | |
653 | struct adb_request **ap = &state->completed; | |
654 | while (*ap != NULL) | |
655 | ap = &(*ap)->next; | |
656 | req->next = NULL; | |
657 | *ap = req; | |
658 | wake_up_interruptible(&state->wait_queue); | |
659 | } | |
660 | spin_unlock_irqrestore(&state->lock, flags); | |
661 | } | |
662 | ||
663 | static int | |
664 | do_adb_query(struct adb_request *req) | |
665 | { | |
666 | int ret = -EINVAL; | |
667 | ||
668 | switch(req->data[1]) | |
669 | { | |
670 | case ADB_QUERY_GETDEVINFO: | |
671 | if (req->nbytes < 3) | |
672 | break; | |
673 | down(&adb_handler_sem); | |
674 | req->reply[0] = adb_handler[req->data[2]].original_address; | |
675 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
676 | up(&adb_handler_sem); | |
677 | req->complete = 1; | |
678 | req->reply_len = 2; | |
679 | adb_write_done(req); | |
680 | ret = 0; | |
681 | break; | |
682 | } | |
683 | return ret; | |
684 | } | |
685 | ||
686 | static int adb_open(struct inode *inode, struct file *file) | |
687 | { | |
688 | struct adbdev_state *state; | |
689 | ||
690 | if (iminor(inode) > 0 || adb_controller == NULL) | |
691 | return -ENXIO; | |
692 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); | |
693 | if (state == 0) | |
694 | return -ENOMEM; | |
695 | file->private_data = state; | |
696 | spin_lock_init(&state->lock); | |
697 | atomic_set(&state->n_pending, 0); | |
698 | state->completed = NULL; | |
699 | init_waitqueue_head(&state->wait_queue); | |
700 | state->inuse = 1; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static int adb_release(struct inode *inode, struct file *file) | |
706 | { | |
707 | struct adbdev_state *state = file->private_data; | |
708 | unsigned long flags; | |
709 | ||
710 | lock_kernel(); | |
711 | if (state) { | |
712 | file->private_data = NULL; | |
713 | spin_lock_irqsave(&state->lock, flags); | |
714 | if (atomic_read(&state->n_pending) == 0 | |
715 | && state->completed == NULL) { | |
716 | spin_unlock_irqrestore(&state->lock, flags); | |
717 | kfree(state); | |
718 | } else { | |
719 | state->inuse = 0; | |
720 | spin_unlock_irqrestore(&state->lock, flags); | |
721 | } | |
722 | } | |
723 | unlock_kernel(); | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static ssize_t adb_read(struct file *file, char __user *buf, | |
728 | size_t count, loff_t *ppos) | |
729 | { | |
730 | int ret = 0; | |
731 | struct adbdev_state *state = file->private_data; | |
732 | struct adb_request *req; | |
733 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
734 | unsigned long flags; | |
735 | ||
736 | if (count < 2) | |
737 | return -EINVAL; | |
738 | if (count > sizeof(req->reply)) | |
739 | count = sizeof(req->reply); | |
740 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
741 | return -EFAULT; | |
742 | ||
743 | req = NULL; | |
744 | spin_lock_irqsave(&state->lock, flags); | |
745 | add_wait_queue(&state->wait_queue, &wait); | |
746 | current->state = TASK_INTERRUPTIBLE; | |
747 | ||
748 | for (;;) { | |
749 | req = state->completed; | |
750 | if (req != NULL) | |
751 | state->completed = req->next; | |
752 | else if (atomic_read(&state->n_pending) == 0) | |
753 | ret = -EIO; | |
754 | if (req != NULL || ret != 0) | |
755 | break; | |
756 | ||
757 | if (file->f_flags & O_NONBLOCK) { | |
758 | ret = -EAGAIN; | |
759 | break; | |
760 | } | |
761 | if (signal_pending(current)) { | |
762 | ret = -ERESTARTSYS; | |
763 | break; | |
764 | } | |
765 | spin_unlock_irqrestore(&state->lock, flags); | |
766 | schedule(); | |
767 | spin_lock_irqsave(&state->lock, flags); | |
768 | } | |
769 | ||
770 | current->state = TASK_RUNNING; | |
771 | remove_wait_queue(&state->wait_queue, &wait); | |
772 | spin_unlock_irqrestore(&state->lock, flags); | |
773 | ||
774 | if (ret) | |
775 | return ret; | |
776 | ||
777 | ret = req->reply_len; | |
778 | if (ret > count) | |
779 | ret = count; | |
780 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
781 | ret = -EFAULT; | |
782 | ||
783 | kfree(req); | |
784 | return ret; | |
785 | } | |
786 | ||
787 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
788 | size_t count, loff_t *ppos) | |
789 | { | |
790 | int ret/*, i*/; | |
791 | struct adbdev_state *state = file->private_data; | |
792 | struct adb_request *req; | |
793 | ||
794 | if (count < 2 || count > sizeof(req->data)) | |
795 | return -EINVAL; | |
796 | if (adb_controller == NULL) | |
797 | return -ENXIO; | |
798 | if (!access_ok(VERIFY_READ, buf, count)) | |
799 | return -EFAULT; | |
800 | ||
5cbded58 | 801 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
802 | GFP_KERNEL); |
803 | if (req == NULL) | |
804 | return -ENOMEM; | |
805 | ||
806 | req->nbytes = count; | |
807 | req->done = adb_write_done; | |
808 | req->arg = (void *) state; | |
809 | req->complete = 0; | |
810 | ||
811 | ret = -EFAULT; | |
812 | if (copy_from_user(req->data, buf, count)) | |
813 | goto out; | |
814 | ||
815 | atomic_inc(&state->n_pending); | |
816 | ||
817 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
818 | down(&adb_probe_mutex); | |
819 | ||
820 | /* Queries are special requests sent to the ADB driver itself */ | |
821 | if (req->data[0] == ADB_QUERY) { | |
822 | if (count > 1) | |
823 | ret = do_adb_query(req); | |
824 | else | |
825 | ret = -EINVAL; | |
826 | up(&adb_probe_mutex); | |
827 | } | |
828 | /* Special case for ADB_BUSRESET request, all others are sent to | |
829 | the controller */ | |
830 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
831 | &&(req->data[1] == ADB_BUSRESET)) { | |
832 | ret = do_adb_reset_bus(); | |
833 | up(&adb_probe_mutex); | |
834 | atomic_dec(&state->n_pending); | |
835 | if (ret == 0) | |
836 | ret = count; | |
837 | goto out; | |
838 | } else { | |
839 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
840 | if (adb_controller && adb_controller->send_request) | |
841 | ret = adb_controller->send_request(req, 0); | |
842 | else | |
843 | ret = -ENXIO; | |
844 | up(&adb_probe_mutex); | |
845 | } | |
846 | ||
847 | if (ret != 0) { | |
848 | atomic_dec(&state->n_pending); | |
849 | goto out; | |
850 | } | |
851 | return count; | |
852 | ||
853 | out: | |
854 | kfree(req); | |
855 | return ret; | |
856 | } | |
857 | ||
fa027c2a | 858 | static const struct file_operations adb_fops = { |
1da177e4 LT |
859 | .owner = THIS_MODULE, |
860 | .llseek = no_llseek, | |
861 | .read = adb_read, | |
862 | .write = adb_write, | |
863 | .open = adb_open, | |
864 | .release = adb_release, | |
865 | }; | |
866 | ||
867 | static void | |
868 | adbdev_init(void) | |
869 | { | |
870 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
871 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
872 | return; | |
873 | } | |
874 | ||
56b22935 | 875 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
876 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 877 | return; |
53f46542 | 878 | class_device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
1da177e4 | 879 | } |