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> | |
c61dace9 | 38 | #include <linux/kthread.h> |
fe2528b9 | 39 | #include <linux/platform_device.h> |
6188e10d | 40 | #include <linux/semaphore.h> |
1da177e4 LT |
41 | |
42 | #include <asm/uaccess.h> | |
1da177e4 LT |
43 | #ifdef CONFIG_PPC |
44 | #include <asm/prom.h> | |
e8222502 | 45 | #include <asm/machdep.h> |
1da177e4 LT |
46 | #endif |
47 | ||
48 | ||
49 | EXPORT_SYMBOL(adb_controller); | |
50 | EXPORT_SYMBOL(adb_client_list); | |
51 | ||
52 | extern struct adb_driver via_macii_driver; | |
53 | extern struct adb_driver via_maciisi_driver; | |
54 | extern struct adb_driver via_cuda_driver; | |
55 | extern struct adb_driver adb_iop_driver; | |
56 | extern struct adb_driver via_pmu_driver; | |
57 | extern struct adb_driver macio_adb_driver; | |
58 | ||
59 | static struct adb_driver *adb_driver_list[] = { | |
60 | #ifdef CONFIG_ADB_MACII | |
61 | &via_macii_driver, | |
62 | #endif | |
63 | #ifdef CONFIG_ADB_MACIISI | |
64 | &via_maciisi_driver, | |
65 | #endif | |
66 | #ifdef CONFIG_ADB_CUDA | |
67 | &via_cuda_driver, | |
68 | #endif | |
69 | #ifdef CONFIG_ADB_IOP | |
70 | &adb_iop_driver, | |
71 | #endif | |
72 | #if defined(CONFIG_ADB_PMU) || defined(CONFIG_ADB_PMU68K) | |
73 | &via_pmu_driver, | |
74 | #endif | |
75 | #ifdef CONFIG_ADB_MACIO | |
76 | &macio_adb_driver, | |
77 | #endif | |
78 | NULL | |
79 | }; | |
80 | ||
56b22935 | 81 | static struct class *adb_dev_class; |
1da177e4 LT |
82 | |
83 | struct adb_driver *adb_controller; | |
e041c683 | 84 | BLOCKING_NOTIFIER_HEAD(adb_client_list); |
1da177e4 LT |
85 | static int adb_got_sleep; |
86 | static int adb_inited; | |
1da177e4 | 87 | static DECLARE_MUTEX(adb_probe_mutex); |
1da177e4 LT |
88 | static int sleepy_trackpad; |
89 | static int autopoll_devs; | |
90 | int __adb_probe_sync; | |
91 | ||
1da177e4 LT |
92 | static int adb_scan_bus(void); |
93 | static int do_adb_reset_bus(void); | |
94 | static void adbdev_init(void); | |
95 | static int try_handler_change(int, int); | |
96 | ||
97 | static struct adb_handler { | |
7d12e780 | 98 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
99 | int original_address; |
100 | int handler_id; | |
101 | int busy; | |
102 | } adb_handler[16]; | |
103 | ||
104 | /* | |
105 | * The adb_handler_sem mutex protects all accesses to the original_address | |
106 | * and handler_id fields of adb_handler[i] for all i, and changes to the | |
107 | * handler field. | |
108 | * Accesses to the handler field are protected by the adb_handler_lock | |
109 | * rwlock. It is held across all calls to any handler, so that by the | |
110 | * time adb_unregister returns, we know that the old handler isn't being | |
111 | * called. | |
112 | */ | |
113 | static DECLARE_MUTEX(adb_handler_sem); | |
114 | static DEFINE_RWLOCK(adb_handler_lock); | |
115 | ||
116 | #if 0 | |
117 | static void printADBreply(struct adb_request *req) | |
118 | { | |
119 | int i; | |
120 | ||
121 | printk("adb reply (%d)", req->reply_len); | |
122 | for(i = 0; i < req->reply_len; i++) | |
123 | printk(" %x", req->reply[i]); | |
124 | printk("\n"); | |
125 | ||
126 | } | |
127 | #endif | |
128 | ||
1da177e4 LT |
129 | static int adb_scan_bus(void) |
130 | { | |
131 | int i, highFree=0, noMovement; | |
132 | int devmask = 0; | |
133 | struct adb_request req; | |
134 | ||
135 | /* assumes adb_handler[] is all zeroes at this point */ | |
136 | for (i = 1; i < 16; i++) { | |
137 | /* see if there is anything at address i */ | |
138 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
139 | (i << 4) | 0xf); | |
140 | if (req.reply_len > 1) | |
141 | /* one or more devices at this address */ | |
142 | adb_handler[i].original_address = i; | |
143 | else if (i > highFree) | |
144 | highFree = i; | |
145 | } | |
146 | ||
147 | /* Note we reset noMovement to 0 each time we move a device */ | |
148 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
149 | for (i = 1; i < 16; i++) { | |
150 | if (adb_handler[i].original_address == 0) | |
151 | continue; | |
152 | /* | |
153 | * Send a "talk register 3" command to address i | |
154 | * to provoke a collision if there is more than | |
155 | * one device at this address. | |
156 | */ | |
157 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
158 | (i << 4) | 0xf); | |
159 | /* | |
160 | * Move the device(s) which didn't detect a | |
161 | * collision to address `highFree'. Hopefully | |
162 | * this only moves one device. | |
163 | */ | |
164 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
165 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
166 | /* | |
167 | * See if anybody actually moved. This is suggested | |
168 | * by HW TechNote 01: | |
169 | * | |
170 | * http://developer.apple.com/technotes/hw/hw_01.html | |
171 | */ | |
172 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
173 | (highFree << 4) | 0xf); | |
174 | if (req.reply_len <= 1) continue; | |
175 | /* | |
176 | * Test whether there are any device(s) left | |
177 | * at address i. | |
178 | */ | |
179 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
180 | (i << 4) | 0xf); | |
181 | if (req.reply_len > 1) { | |
182 | /* | |
183 | * There are still one or more devices | |
184 | * left at address i. Register the one(s) | |
185 | * we moved to `highFree', and find a new | |
186 | * value for highFree. | |
187 | */ | |
188 | adb_handler[highFree].original_address = | |
189 | adb_handler[i].original_address; | |
190 | while (highFree > 0 && | |
191 | adb_handler[highFree].original_address) | |
192 | highFree--; | |
193 | if (highFree <= 0) | |
194 | break; | |
195 | ||
196 | noMovement = 0; | |
197 | } | |
198 | else { | |
199 | /* | |
200 | * No devices left at address i; move the | |
201 | * one(s) we moved to `highFree' back to i. | |
202 | */ | |
203 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
204 | (highFree << 4) | 0xb, | |
205 | (i | 0x60), 0xfe); | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
211 | printk(KERN_DEBUG "adb devices:"); | |
212 | for (i = 1; i < 16; i++) { | |
213 | if (adb_handler[i].original_address == 0) | |
214 | continue; | |
215 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
216 | (i << 4) | 0xf); | |
217 | adb_handler[i].handler_id = req.reply[2]; | |
218 | printk(" [%d]: %d %x", i, adb_handler[i].original_address, | |
219 | adb_handler[i].handler_id); | |
220 | devmask |= 1 << i; | |
221 | } | |
222 | printk("\n"); | |
223 | return devmask; | |
224 | } | |
225 | ||
226 | /* | |
227 | * This kernel task handles ADB probing. It dies once probing is | |
228 | * completed. | |
229 | */ | |
230 | static int | |
231 | adb_probe_task(void *x) | |
232 | { | |
1da177e4 LT |
233 | printk(KERN_INFO "adb: starting probe task...\n"); |
234 | do_adb_reset_bus(); | |
235 | printk(KERN_INFO "adb: finished probe task...\n"); | |
1b6dd9ba | 236 | |
1da177e4 | 237 | up(&adb_probe_mutex); |
1b6dd9ba | 238 | |
1da177e4 LT |
239 | return 0; |
240 | } | |
241 | ||
242 | static void | |
3e577a80 | 243 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 | 244 | { |
c61dace9 | 245 | kthread_run(adb_probe_task, NULL, "kadbprobe"); |
1da177e4 LT |
246 | } |
247 | ||
3e577a80 | 248 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
249 | |
250 | int | |
251 | adb_reset_bus(void) | |
252 | { | |
253 | if (__adb_probe_sync) { | |
254 | do_adb_reset_bus(); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | down(&adb_probe_mutex); | |
259 | schedule_work(&adb_reset_work); | |
260 | return 0; | |
261 | } | |
262 | ||
c9f6d3d5 JB |
263 | #ifdef CONFIG_PM |
264 | /* | |
265 | * notify clients before sleep | |
266 | */ | |
267 | static int adb_suspend(struct platform_device *dev, pm_message_t state) | |
268 | { | |
269 | adb_got_sleep = 1; | |
270 | /* We need to get a lock on the probe thread */ | |
271 | down(&adb_probe_mutex); | |
272 | /* Stop autopoll */ | |
273 | if (adb_controller->autopoll) | |
274 | adb_controller->autopoll(0); | |
275 | blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | /* | |
281 | * reset bus after sleep | |
282 | */ | |
283 | static int adb_resume(struct platform_device *dev) | |
284 | { | |
285 | adb_got_sleep = 0; | |
286 | up(&adb_probe_mutex); | |
287 | adb_reset_bus(); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | #endif /* CONFIG_PM */ | |
292 | ||
1da177e4 LT |
293 | int __init adb_init(void) |
294 | { | |
295 | struct adb_driver *driver; | |
296 | int i; | |
297 | ||
298 | #ifdef CONFIG_PPC32 | |
e8222502 | 299 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
300 | return 0; |
301 | #endif | |
302 | #ifdef CONFIG_MAC | |
303 | if (!MACH_IS_MAC) | |
304 | return 0; | |
305 | #endif | |
306 | ||
307 | /* xmon may do early-init */ | |
308 | if (adb_inited) | |
309 | return 0; | |
310 | adb_inited = 1; | |
311 | ||
312 | adb_controller = NULL; | |
313 | ||
314 | i = 0; | |
315 | while ((driver = adb_driver_list[i++]) != NULL) { | |
316 | if (!driver->probe()) { | |
317 | adb_controller = driver; | |
318 | break; | |
319 | } | |
320 | } | |
321 | if ((adb_controller == NULL) || adb_controller->init()) { | |
322 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
323 | adb_controller = NULL; | |
324 | } else { | |
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 */ | |
c9f6d3d5 | 330 | |
1da177e4 LT |
331 | adbdev_init(); |
332 | adb_reset_bus(); | |
333 | } | |
334 | return 0; | |
335 | } | |
336 | ||
337 | __initcall(adb_init); | |
338 | ||
1da177e4 LT |
339 | static int |
340 | do_adb_reset_bus(void) | |
341 | { | |
70b52b38 | 342 | int ret; |
1da177e4 LT |
343 | |
344 | if (adb_controller == NULL) | |
345 | return -ENXIO; | |
346 | ||
347 | if (adb_controller->autopoll) | |
348 | adb_controller->autopoll(0); | |
349 | ||
70b52b38 JB |
350 | blocking_notifier_call_chain(&adb_client_list, |
351 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
352 | |
353 | if (sleepy_trackpad) { | |
354 | /* Let the trackpad settle down */ | |
c61dace9 | 355 | msleep(500); |
1da177e4 LT |
356 | } |
357 | ||
358 | down(&adb_handler_sem); | |
359 | write_lock_irq(&adb_handler_lock); | |
360 | memset(adb_handler, 0, sizeof(adb_handler)); | |
361 | write_unlock_irq(&adb_handler_lock); | |
362 | ||
363 | /* That one is still a bit synchronous, oh well... */ | |
364 | if (adb_controller->reset_bus) | |
365 | ret = adb_controller->reset_bus(); | |
366 | else | |
367 | ret = 0; | |
368 | ||
369 | if (sleepy_trackpad) { | |
370 | /* Let the trackpad settle down */ | |
c61dace9 | 371 | msleep(1500); |
1da177e4 LT |
372 | } |
373 | ||
374 | if (!ret) { | |
375 | autopoll_devs = adb_scan_bus(); | |
376 | if (adb_controller->autopoll) | |
377 | adb_controller->autopoll(autopoll_devs); | |
378 | } | |
379 | up(&adb_handler_sem); | |
380 | ||
70b52b38 JB |
381 | blocking_notifier_call_chain(&adb_client_list, |
382 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
383 | |
384 | return ret; | |
385 | } | |
386 | ||
387 | void | |
388 | adb_poll(void) | |
389 | { | |
390 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
391 | return; | |
392 | adb_controller->poll(); | |
393 | } | |
394 | ||
c61dace9 | 395 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 396 | { |
c61dace9 | 397 | struct completion *comp = req->arg; |
1da177e4 | 398 | |
c61dace9 PM |
399 | complete(comp); |
400 | } | |
1da177e4 LT |
401 | |
402 | int | |
403 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
404 | int flags, int nbytes, ...) | |
405 | { | |
406 | va_list list; | |
c61dace9 | 407 | int i; |
1da177e4 | 408 | int rc; |
c61dace9 | 409 | struct completion comp; |
1da177e4 LT |
410 | |
411 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
412 | return -ENXIO; | |
413 | if (nbytes < 1) | |
414 | return -EINVAL; | |
c61dace9 | 415 | |
1da177e4 LT |
416 | req->nbytes = nbytes+1; |
417 | req->done = done; | |
418 | req->reply_expected = flags & ADBREQ_REPLY; | |
419 | req->data[0] = ADB_PACKET; | |
420 | va_start(list, nbytes); | |
421 | for (i = 0; i < nbytes; ++i) | |
422 | req->data[i+1] = va_arg(list, int); | |
423 | va_end(list); | |
424 | ||
425 | if (flags & ADBREQ_NOSEND) | |
426 | return 0; | |
427 | ||
c61dace9 PM |
428 | /* Synchronous requests block using an on-stack completion */ |
429 | if (flags & ADBREQ_SYNC) { | |
430 | WARN_ON(done); | |
431 | req->done = adb_sync_req_done; | |
432 | req->arg = ∁ | |
433 | init_completion(&comp); | |
1da177e4 LT |
434 | } |
435 | ||
c61dace9 PM |
436 | rc = adb_controller->send_request(req, 0); |
437 | ||
438 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
439 | wait_for_completion(&comp); | |
1da177e4 LT |
440 | |
441 | return rc; | |
442 | } | |
443 | ||
444 | /* Ultimately this should return the number of devices with | |
445 | the given default id. | |
446 | And it does it now ! Note: changed behaviour: This function | |
447 | will now register if default_id _and_ handler_id both match | |
448 | but handler_id can be left to 0 to match with default_id only. | |
449 | When handler_id is set, this function will try to adjust | |
450 | the handler_id id it doesn't match. */ | |
451 | int | |
452 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 453 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
454 | { |
455 | int i; | |
456 | ||
457 | down(&adb_handler_sem); | |
458 | ids->nids = 0; | |
459 | for (i = 1; i < 16; i++) { | |
460 | if ((adb_handler[i].original_address == default_id) && | |
461 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
462 | try_handler_change(i, handler_id))) { | |
463 | if (adb_handler[i].handler != 0) { | |
464 | printk(KERN_ERR | |
465 | "Two handlers for ADB device %d\n", | |
466 | default_id); | |
467 | continue; | |
468 | } | |
469 | write_lock_irq(&adb_handler_lock); | |
470 | adb_handler[i].handler = handler; | |
471 | write_unlock_irq(&adb_handler_lock); | |
472 | ids->id[ids->nids++] = i; | |
473 | } | |
474 | } | |
475 | up(&adb_handler_sem); | |
476 | return ids->nids; | |
477 | } | |
478 | ||
479 | int | |
480 | adb_unregister(int index) | |
481 | { | |
482 | int ret = -ENODEV; | |
483 | ||
484 | down(&adb_handler_sem); | |
485 | write_lock_irq(&adb_handler_lock); | |
486 | if (adb_handler[index].handler) { | |
487 | while(adb_handler[index].busy) { | |
488 | write_unlock_irq(&adb_handler_lock); | |
489 | yield(); | |
490 | write_lock_irq(&adb_handler_lock); | |
491 | } | |
492 | ret = 0; | |
493 | adb_handler[index].handler = NULL; | |
494 | } | |
495 | write_unlock_irq(&adb_handler_lock); | |
496 | up(&adb_handler_sem); | |
497 | return ret; | |
498 | } | |
499 | ||
500 | void | |
7d12e780 | 501 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
502 | { |
503 | int i, id; | |
504 | static int dump_adb_input = 0; | |
505 | unsigned long flags; | |
506 | ||
7d12e780 | 507 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
508 | |
509 | /* We skip keystrokes and mouse moves when the sleep process | |
510 | * has been started. We stop autopoll, but this is another security | |
511 | */ | |
512 | if (adb_got_sleep) | |
513 | return; | |
514 | ||
515 | id = buf[0] >> 4; | |
516 | if (dump_adb_input) { | |
517 | printk(KERN_INFO "adb packet: "); | |
518 | for (i = 0; i < nb; ++i) | |
519 | printk(" %x", buf[i]); | |
520 | printk(", id = %d\n", id); | |
521 | } | |
522 | write_lock_irqsave(&adb_handler_lock, flags); | |
523 | handler = adb_handler[id].handler; | |
524 | if (handler != NULL) | |
525 | adb_handler[id].busy = 1; | |
526 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
527 | if (handler != NULL) { | |
7d12e780 | 528 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
529 | wmb(); |
530 | adb_handler[id].busy = 0; | |
531 | } | |
532 | ||
533 | } | |
534 | ||
535 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
536 | static int try_handler_change(int address, int new_id) | |
537 | { | |
538 | struct adb_request req; | |
539 | ||
540 | if (adb_handler[address].handler_id == new_id) | |
541 | return 1; | |
542 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
543 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
544 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
545 | ADB_READREG(address, 3)); | |
546 | if (req.reply_len < 2) | |
547 | return 0; | |
548 | if (req.reply[2] != new_id) | |
549 | return 0; | |
550 | adb_handler[address].handler_id = req.reply[2]; | |
551 | ||
552 | return 1; | |
553 | } | |
554 | ||
555 | int | |
556 | adb_try_handler_change(int address, int new_id) | |
557 | { | |
558 | int ret; | |
559 | ||
560 | down(&adb_handler_sem); | |
561 | ret = try_handler_change(address, new_id); | |
562 | up(&adb_handler_sem); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | int | |
567 | adb_get_infos(int address, int *original_address, int *handler_id) | |
568 | { | |
569 | down(&adb_handler_sem); | |
570 | *original_address = adb_handler[address].original_address; | |
571 | *handler_id = adb_handler[address].handler_id; | |
572 | up(&adb_handler_sem); | |
573 | ||
574 | return (*original_address != 0); | |
575 | } | |
576 | ||
577 | ||
578 | /* | |
579 | * /dev/adb device driver. | |
580 | */ | |
581 | ||
582 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
583 | ||
584 | struct adbdev_state { | |
585 | spinlock_t lock; | |
586 | atomic_t n_pending; | |
587 | struct adb_request *completed; | |
588 | wait_queue_head_t wait_queue; | |
589 | int inuse; | |
590 | }; | |
591 | ||
592 | static void adb_write_done(struct adb_request *req) | |
593 | { | |
594 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
595 | unsigned long flags; | |
596 | ||
597 | if (!req->complete) { | |
598 | req->reply_len = 0; | |
599 | req->complete = 1; | |
600 | } | |
601 | spin_lock_irqsave(&state->lock, flags); | |
602 | atomic_dec(&state->n_pending); | |
603 | if (!state->inuse) { | |
604 | kfree(req); | |
605 | if (atomic_read(&state->n_pending) == 0) { | |
606 | spin_unlock_irqrestore(&state->lock, flags); | |
607 | kfree(state); | |
608 | return; | |
609 | } | |
610 | } else { | |
611 | struct adb_request **ap = &state->completed; | |
612 | while (*ap != NULL) | |
613 | ap = &(*ap)->next; | |
614 | req->next = NULL; | |
615 | *ap = req; | |
616 | wake_up_interruptible(&state->wait_queue); | |
617 | } | |
618 | spin_unlock_irqrestore(&state->lock, flags); | |
619 | } | |
620 | ||
621 | static int | |
622 | do_adb_query(struct adb_request *req) | |
623 | { | |
624 | int ret = -EINVAL; | |
625 | ||
626 | switch(req->data[1]) | |
627 | { | |
628 | case ADB_QUERY_GETDEVINFO: | |
629 | if (req->nbytes < 3) | |
630 | break; | |
631 | down(&adb_handler_sem); | |
632 | req->reply[0] = adb_handler[req->data[2]].original_address; | |
633 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
634 | up(&adb_handler_sem); | |
635 | req->complete = 1; | |
636 | req->reply_len = 2; | |
637 | adb_write_done(req); | |
638 | ret = 0; | |
639 | break; | |
640 | } | |
641 | return ret; | |
642 | } | |
643 | ||
644 | static int adb_open(struct inode *inode, struct file *file) | |
645 | { | |
646 | struct adbdev_state *state; | |
647 | ||
648 | if (iminor(inode) > 0 || adb_controller == NULL) | |
649 | return -ENXIO; | |
650 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); | |
651 | if (state == 0) | |
652 | return -ENOMEM; | |
653 | file->private_data = state; | |
654 | spin_lock_init(&state->lock); | |
655 | atomic_set(&state->n_pending, 0); | |
656 | state->completed = NULL; | |
657 | init_waitqueue_head(&state->wait_queue); | |
658 | state->inuse = 1; | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static int adb_release(struct inode *inode, struct file *file) | |
664 | { | |
665 | struct adbdev_state *state = file->private_data; | |
666 | unsigned long flags; | |
667 | ||
668 | lock_kernel(); | |
669 | if (state) { | |
670 | file->private_data = NULL; | |
671 | spin_lock_irqsave(&state->lock, flags); | |
672 | if (atomic_read(&state->n_pending) == 0 | |
673 | && state->completed == NULL) { | |
674 | spin_unlock_irqrestore(&state->lock, flags); | |
675 | kfree(state); | |
676 | } else { | |
677 | state->inuse = 0; | |
678 | spin_unlock_irqrestore(&state->lock, flags); | |
679 | } | |
680 | } | |
681 | unlock_kernel(); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static ssize_t adb_read(struct file *file, char __user *buf, | |
686 | size_t count, loff_t *ppos) | |
687 | { | |
688 | int ret = 0; | |
689 | struct adbdev_state *state = file->private_data; | |
690 | struct adb_request *req; | |
691 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
692 | unsigned long flags; | |
693 | ||
694 | if (count < 2) | |
695 | return -EINVAL; | |
696 | if (count > sizeof(req->reply)) | |
697 | count = sizeof(req->reply); | |
698 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
699 | return -EFAULT; | |
700 | ||
701 | req = NULL; | |
702 | spin_lock_irqsave(&state->lock, flags); | |
703 | add_wait_queue(&state->wait_queue, &wait); | |
704 | current->state = TASK_INTERRUPTIBLE; | |
705 | ||
706 | for (;;) { | |
707 | req = state->completed; | |
708 | if (req != NULL) | |
709 | state->completed = req->next; | |
710 | else if (atomic_read(&state->n_pending) == 0) | |
711 | ret = -EIO; | |
712 | if (req != NULL || ret != 0) | |
713 | break; | |
714 | ||
715 | if (file->f_flags & O_NONBLOCK) { | |
716 | ret = -EAGAIN; | |
717 | break; | |
718 | } | |
719 | if (signal_pending(current)) { | |
720 | ret = -ERESTARTSYS; | |
721 | break; | |
722 | } | |
723 | spin_unlock_irqrestore(&state->lock, flags); | |
724 | schedule(); | |
725 | spin_lock_irqsave(&state->lock, flags); | |
726 | } | |
727 | ||
728 | current->state = TASK_RUNNING; | |
729 | remove_wait_queue(&state->wait_queue, &wait); | |
730 | spin_unlock_irqrestore(&state->lock, flags); | |
731 | ||
732 | if (ret) | |
733 | return ret; | |
734 | ||
735 | ret = req->reply_len; | |
736 | if (ret > count) | |
737 | ret = count; | |
738 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
739 | ret = -EFAULT; | |
740 | ||
741 | kfree(req); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
746 | size_t count, loff_t *ppos) | |
747 | { | |
748 | int ret/*, i*/; | |
749 | struct adbdev_state *state = file->private_data; | |
750 | struct adb_request *req; | |
751 | ||
752 | if (count < 2 || count > sizeof(req->data)) | |
753 | return -EINVAL; | |
754 | if (adb_controller == NULL) | |
755 | return -ENXIO; | |
756 | if (!access_ok(VERIFY_READ, buf, count)) | |
757 | return -EFAULT; | |
758 | ||
5cbded58 | 759 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
760 | GFP_KERNEL); |
761 | if (req == NULL) | |
762 | return -ENOMEM; | |
763 | ||
764 | req->nbytes = count; | |
765 | req->done = adb_write_done; | |
766 | req->arg = (void *) state; | |
767 | req->complete = 0; | |
768 | ||
769 | ret = -EFAULT; | |
770 | if (copy_from_user(req->data, buf, count)) | |
771 | goto out; | |
772 | ||
773 | atomic_inc(&state->n_pending); | |
774 | ||
775 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
776 | down(&adb_probe_mutex); | |
777 | ||
778 | /* Queries are special requests sent to the ADB driver itself */ | |
779 | if (req->data[0] == ADB_QUERY) { | |
780 | if (count > 1) | |
781 | ret = do_adb_query(req); | |
782 | else | |
783 | ret = -EINVAL; | |
784 | up(&adb_probe_mutex); | |
785 | } | |
786 | /* Special case for ADB_BUSRESET request, all others are sent to | |
787 | the controller */ | |
788 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
789 | &&(req->data[1] == ADB_BUSRESET)) { | |
790 | ret = do_adb_reset_bus(); | |
791 | up(&adb_probe_mutex); | |
792 | atomic_dec(&state->n_pending); | |
793 | if (ret == 0) | |
794 | ret = count; | |
795 | goto out; | |
796 | } else { | |
797 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
798 | if (adb_controller && adb_controller->send_request) | |
799 | ret = adb_controller->send_request(req, 0); | |
800 | else | |
801 | ret = -ENXIO; | |
802 | up(&adb_probe_mutex); | |
803 | } | |
804 | ||
805 | if (ret != 0) { | |
806 | atomic_dec(&state->n_pending); | |
807 | goto out; | |
808 | } | |
809 | return count; | |
810 | ||
811 | out: | |
812 | kfree(req); | |
813 | return ret; | |
814 | } | |
815 | ||
fa027c2a | 816 | static const struct file_operations adb_fops = { |
1da177e4 LT |
817 | .owner = THIS_MODULE, |
818 | .llseek = no_llseek, | |
819 | .read = adb_read, | |
820 | .write = adb_write, | |
821 | .open = adb_open, | |
822 | .release = adb_release, | |
823 | }; | |
824 | ||
c9f6d3d5 JB |
825 | static struct platform_driver adb_pfdrv = { |
826 | .driver = { | |
827 | .name = "adb", | |
828 | }, | |
829 | #ifdef CONFIG_PM | |
830 | .suspend = adb_suspend, | |
831 | .resume = adb_resume, | |
832 | #endif | |
833 | }; | |
834 | ||
835 | static struct platform_device adb_pfdev = { | |
836 | .name = "adb", | |
837 | }; | |
838 | ||
839 | static int __init | |
840 | adb_dummy_probe(struct platform_device *dev) | |
841 | { | |
842 | if (dev == &adb_pfdev) | |
843 | return 0; | |
844 | return -ENODEV; | |
845 | } | |
846 | ||
847 | static void __init | |
1da177e4 LT |
848 | adbdev_init(void) |
849 | { | |
850 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
851 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
852 | return; | |
853 | } | |
854 | ||
56b22935 | 855 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
856 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 857 | return; |
68db2bc9 | 858 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), "adb"); |
c9f6d3d5 JB |
859 | |
860 | platform_device_register(&adb_pfdev); | |
861 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 862 | } |