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> |
af3ce514 | 40 | #include <linux/mutex.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 | ||
1da177e4 LT |
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 | 81 | |
9b4a8dd2 | 82 | static 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; | |
1da177e4 | 86 | static DECLARE_MUTEX(adb_probe_mutex); |
1da177e4 LT |
87 | static int sleepy_trackpad; |
88 | static int autopoll_devs; | |
89 | int __adb_probe_sync; | |
90 | ||
1da177e4 LT |
91 | static int adb_scan_bus(void); |
92 | static int do_adb_reset_bus(void); | |
93 | static void adbdev_init(void); | |
94 | static int try_handler_change(int, int); | |
95 | ||
96 | static struct adb_handler { | |
7d12e780 | 97 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
98 | int original_address; |
99 | int handler_id; | |
100 | int busy; | |
101 | } adb_handler[16]; | |
102 | ||
103 | /* | |
af3ce514 | 104 | * The adb_handler_mutex mutex protects all accesses to the original_address |
1da177e4 LT |
105 | * and handler_id fields of adb_handler[i] for all i, and changes to the |
106 | * handler field. | |
107 | * Accesses to the handler field are protected by the adb_handler_lock | |
108 | * rwlock. It is held across all calls to any handler, so that by the | |
109 | * time adb_unregister returns, we know that the old handler isn't being | |
110 | * called. | |
111 | */ | |
af3ce514 | 112 | static DEFINE_MUTEX(adb_handler_mutex); |
1da177e4 LT |
113 | static DEFINE_RWLOCK(adb_handler_lock); |
114 | ||
115 | #if 0 | |
116 | static void printADBreply(struct adb_request *req) | |
117 | { | |
118 | int i; | |
119 | ||
120 | printk("adb reply (%d)", req->reply_len); | |
121 | for(i = 0; i < req->reply_len; i++) | |
122 | printk(" %x", req->reply[i]); | |
123 | printk("\n"); | |
124 | ||
125 | } | |
126 | #endif | |
127 | ||
1da177e4 LT |
128 | static int adb_scan_bus(void) |
129 | { | |
130 | int i, highFree=0, noMovement; | |
131 | int devmask = 0; | |
132 | struct adb_request req; | |
133 | ||
134 | /* assumes adb_handler[] is all zeroes at this point */ | |
135 | for (i = 1; i < 16; i++) { | |
136 | /* see if there is anything at address i */ | |
137 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
138 | (i << 4) | 0xf); | |
139 | if (req.reply_len > 1) | |
140 | /* one or more devices at this address */ | |
141 | adb_handler[i].original_address = i; | |
142 | else if (i > highFree) | |
143 | highFree = i; | |
144 | } | |
145 | ||
146 | /* Note we reset noMovement to 0 each time we move a device */ | |
147 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
148 | for (i = 1; i < 16; i++) { | |
149 | if (adb_handler[i].original_address == 0) | |
150 | continue; | |
151 | /* | |
152 | * Send a "talk register 3" command to address i | |
153 | * to provoke a collision if there is more than | |
154 | * one device at this address. | |
155 | */ | |
156 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
157 | (i << 4) | 0xf); | |
158 | /* | |
159 | * Move the device(s) which didn't detect a | |
160 | * collision to address `highFree'. Hopefully | |
161 | * this only moves one device. | |
162 | */ | |
163 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
164 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
165 | /* | |
166 | * See if anybody actually moved. This is suggested | |
167 | * by HW TechNote 01: | |
168 | * | |
169 | * http://developer.apple.com/technotes/hw/hw_01.html | |
170 | */ | |
171 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
172 | (highFree << 4) | 0xf); | |
173 | if (req.reply_len <= 1) continue; | |
174 | /* | |
175 | * Test whether there are any device(s) left | |
176 | * at address i. | |
177 | */ | |
178 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
179 | (i << 4) | 0xf); | |
180 | if (req.reply_len > 1) { | |
181 | /* | |
182 | * There are still one or more devices | |
183 | * left at address i. Register the one(s) | |
184 | * we moved to `highFree', and find a new | |
185 | * value for highFree. | |
186 | */ | |
187 | adb_handler[highFree].original_address = | |
188 | adb_handler[i].original_address; | |
189 | while (highFree > 0 && | |
190 | adb_handler[highFree].original_address) | |
191 | highFree--; | |
192 | if (highFree <= 0) | |
193 | break; | |
194 | ||
195 | noMovement = 0; | |
196 | } | |
197 | else { | |
198 | /* | |
199 | * No devices left at address i; move the | |
200 | * one(s) we moved to `highFree' back to i. | |
201 | */ | |
202 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
203 | (highFree << 4) | 0xb, | |
204 | (i | 0x60), 0xfe); | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
210 | printk(KERN_DEBUG "adb devices:"); | |
211 | for (i = 1; i < 16; i++) { | |
212 | if (adb_handler[i].original_address == 0) | |
213 | continue; | |
214 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
215 | (i << 4) | 0xf); | |
216 | adb_handler[i].handler_id = req.reply[2]; | |
217 | printk(" [%d]: %d %x", i, adb_handler[i].original_address, | |
218 | adb_handler[i].handler_id); | |
219 | devmask |= 1 << i; | |
220 | } | |
221 | printk("\n"); | |
222 | return devmask; | |
223 | } | |
224 | ||
225 | /* | |
226 | * This kernel task handles ADB probing. It dies once probing is | |
227 | * completed. | |
228 | */ | |
229 | static int | |
230 | adb_probe_task(void *x) | |
231 | { | |
1da177e4 LT |
232 | printk(KERN_INFO "adb: starting probe task...\n"); |
233 | do_adb_reset_bus(); | |
234 | printk(KERN_INFO "adb: finished probe task...\n"); | |
1b6dd9ba | 235 | |
1da177e4 | 236 | up(&adb_probe_mutex); |
1b6dd9ba | 237 | |
1da177e4 LT |
238 | return 0; |
239 | } | |
240 | ||
241 | static void | |
3e577a80 | 242 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 | 243 | { |
c61dace9 | 244 | kthread_run(adb_probe_task, NULL, "kadbprobe"); |
1da177e4 LT |
245 | } |
246 | ||
3e577a80 | 247 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
248 | |
249 | int | |
250 | adb_reset_bus(void) | |
251 | { | |
252 | if (__adb_probe_sync) { | |
253 | do_adb_reset_bus(); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | down(&adb_probe_mutex); | |
258 | schedule_work(&adb_reset_work); | |
259 | return 0; | |
260 | } | |
261 | ||
c9f6d3d5 JB |
262 | #ifdef CONFIG_PM |
263 | /* | |
264 | * notify clients before sleep | |
265 | */ | |
266 | static int adb_suspend(struct platform_device *dev, pm_message_t state) | |
267 | { | |
268 | adb_got_sleep = 1; | |
269 | /* We need to get a lock on the probe thread */ | |
270 | down(&adb_probe_mutex); | |
271 | /* Stop autopoll */ | |
272 | if (adb_controller->autopoll) | |
273 | adb_controller->autopoll(0); | |
274 | blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | /* | |
280 | * reset bus after sleep | |
281 | */ | |
282 | static int adb_resume(struct platform_device *dev) | |
283 | { | |
284 | adb_got_sleep = 0; | |
285 | up(&adb_probe_mutex); | |
286 | adb_reset_bus(); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | #endif /* CONFIG_PM */ | |
291 | ||
9b4a8dd2 | 292 | static int __init adb_init(void) |
1da177e4 LT |
293 | { |
294 | struct adb_driver *driver; | |
295 | int i; | |
296 | ||
297 | #ifdef CONFIG_PPC32 | |
e8222502 | 298 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
299 | return 0; |
300 | #endif | |
301 | #ifdef CONFIG_MAC | |
302 | if (!MACH_IS_MAC) | |
303 | return 0; | |
304 | #endif | |
305 | ||
306 | /* xmon may do early-init */ | |
307 | if (adb_inited) | |
308 | return 0; | |
309 | adb_inited = 1; | |
310 | ||
311 | adb_controller = NULL; | |
312 | ||
313 | i = 0; | |
314 | while ((driver = adb_driver_list[i++]) != NULL) { | |
315 | if (!driver->probe()) { | |
316 | adb_controller = driver; | |
317 | break; | |
318 | } | |
319 | } | |
320 | if ((adb_controller == NULL) || adb_controller->init()) { | |
321 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
322 | adb_controller = NULL; | |
323 | } else { | |
1da177e4 LT |
324 | #ifdef CONFIG_PPC |
325 | if (machine_is_compatible("AAPL,PowerBook1998") || | |
326 | machine_is_compatible("PowerBook1,1")) | |
327 | sleepy_trackpad = 1; | |
328 | #endif /* CONFIG_PPC */ | |
c9f6d3d5 | 329 | |
1da177e4 LT |
330 | adbdev_init(); |
331 | adb_reset_bus(); | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
faa5b9da | 336 | device_initcall(adb_init); |
1da177e4 | 337 | |
1da177e4 LT |
338 | static int |
339 | do_adb_reset_bus(void) | |
340 | { | |
70b52b38 | 341 | int ret; |
1da177e4 LT |
342 | |
343 | if (adb_controller == NULL) | |
344 | return -ENXIO; | |
345 | ||
346 | if (adb_controller->autopoll) | |
347 | adb_controller->autopoll(0); | |
348 | ||
70b52b38 JB |
349 | blocking_notifier_call_chain(&adb_client_list, |
350 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
351 | |
352 | if (sleepy_trackpad) { | |
353 | /* Let the trackpad settle down */ | |
c61dace9 | 354 | msleep(500); |
1da177e4 LT |
355 | } |
356 | ||
af3ce514 | 357 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
358 | write_lock_irq(&adb_handler_lock); |
359 | memset(adb_handler, 0, sizeof(adb_handler)); | |
360 | write_unlock_irq(&adb_handler_lock); | |
361 | ||
362 | /* That one is still a bit synchronous, oh well... */ | |
363 | if (adb_controller->reset_bus) | |
364 | ret = adb_controller->reset_bus(); | |
365 | else | |
366 | ret = 0; | |
367 | ||
368 | if (sleepy_trackpad) { | |
369 | /* Let the trackpad settle down */ | |
c61dace9 | 370 | msleep(1500); |
1da177e4 LT |
371 | } |
372 | ||
373 | if (!ret) { | |
374 | autopoll_devs = adb_scan_bus(); | |
375 | if (adb_controller->autopoll) | |
376 | adb_controller->autopoll(autopoll_devs); | |
377 | } | |
af3ce514 | 378 | mutex_unlock(&adb_handler_mutex); |
1da177e4 | 379 | |
70b52b38 JB |
380 | blocking_notifier_call_chain(&adb_client_list, |
381 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
382 | |
383 | return ret; | |
384 | } | |
385 | ||
386 | void | |
387 | adb_poll(void) | |
388 | { | |
389 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
390 | return; | |
391 | adb_controller->poll(); | |
392 | } | |
393 | ||
c61dace9 | 394 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 395 | { |
c61dace9 | 396 | struct completion *comp = req->arg; |
1da177e4 | 397 | |
c61dace9 PM |
398 | complete(comp); |
399 | } | |
1da177e4 LT |
400 | |
401 | int | |
402 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
403 | int flags, int nbytes, ...) | |
404 | { | |
405 | va_list list; | |
c61dace9 | 406 | int i; |
1da177e4 | 407 | int rc; |
c61dace9 | 408 | struct completion comp; |
1da177e4 LT |
409 | |
410 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
411 | return -ENXIO; | |
412 | if (nbytes < 1) | |
413 | return -EINVAL; | |
c61dace9 | 414 | |
1da177e4 LT |
415 | req->nbytes = nbytes+1; |
416 | req->done = done; | |
417 | req->reply_expected = flags & ADBREQ_REPLY; | |
418 | req->data[0] = ADB_PACKET; | |
419 | va_start(list, nbytes); | |
420 | for (i = 0; i < nbytes; ++i) | |
421 | req->data[i+1] = va_arg(list, int); | |
422 | va_end(list); | |
423 | ||
424 | if (flags & ADBREQ_NOSEND) | |
425 | return 0; | |
426 | ||
c61dace9 PM |
427 | /* Synchronous requests block using an on-stack completion */ |
428 | if (flags & ADBREQ_SYNC) { | |
429 | WARN_ON(done); | |
430 | req->done = adb_sync_req_done; | |
431 | req->arg = ∁ | |
432 | init_completion(&comp); | |
1da177e4 LT |
433 | } |
434 | ||
c61dace9 PM |
435 | rc = adb_controller->send_request(req, 0); |
436 | ||
437 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
438 | wait_for_completion(&comp); | |
1da177e4 LT |
439 | |
440 | return rc; | |
441 | } | |
442 | ||
443 | /* Ultimately this should return the number of devices with | |
444 | the given default id. | |
445 | And it does it now ! Note: changed behaviour: This function | |
446 | will now register if default_id _and_ handler_id both match | |
447 | but handler_id can be left to 0 to match with default_id only. | |
448 | When handler_id is set, this function will try to adjust | |
449 | the handler_id id it doesn't match. */ | |
450 | int | |
451 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 452 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
453 | { |
454 | int i; | |
455 | ||
af3ce514 | 456 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
457 | ids->nids = 0; |
458 | for (i = 1; i < 16; i++) { | |
459 | if ((adb_handler[i].original_address == default_id) && | |
460 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
461 | try_handler_change(i, handler_id))) { | |
462 | if (adb_handler[i].handler != 0) { | |
463 | printk(KERN_ERR | |
464 | "Two handlers for ADB device %d\n", | |
465 | default_id); | |
466 | continue; | |
467 | } | |
468 | write_lock_irq(&adb_handler_lock); | |
469 | adb_handler[i].handler = handler; | |
470 | write_unlock_irq(&adb_handler_lock); | |
471 | ids->id[ids->nids++] = i; | |
472 | } | |
473 | } | |
af3ce514 | 474 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
475 | return ids->nids; |
476 | } | |
477 | ||
478 | int | |
479 | adb_unregister(int index) | |
480 | { | |
481 | int ret = -ENODEV; | |
482 | ||
af3ce514 | 483 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
484 | write_lock_irq(&adb_handler_lock); |
485 | if (adb_handler[index].handler) { | |
486 | while(adb_handler[index].busy) { | |
487 | write_unlock_irq(&adb_handler_lock); | |
488 | yield(); | |
489 | write_lock_irq(&adb_handler_lock); | |
490 | } | |
491 | ret = 0; | |
492 | adb_handler[index].handler = NULL; | |
493 | } | |
494 | write_unlock_irq(&adb_handler_lock); | |
af3ce514 | 495 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
496 | return ret; |
497 | } | |
498 | ||
499 | void | |
7d12e780 | 500 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
501 | { |
502 | int i, id; | |
503 | static int dump_adb_input = 0; | |
504 | unsigned long flags; | |
505 | ||
7d12e780 | 506 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
507 | |
508 | /* We skip keystrokes and mouse moves when the sleep process | |
509 | * has been started. We stop autopoll, but this is another security | |
510 | */ | |
511 | if (adb_got_sleep) | |
512 | return; | |
513 | ||
514 | id = buf[0] >> 4; | |
515 | if (dump_adb_input) { | |
516 | printk(KERN_INFO "adb packet: "); | |
517 | for (i = 0; i < nb; ++i) | |
518 | printk(" %x", buf[i]); | |
519 | printk(", id = %d\n", id); | |
520 | } | |
521 | write_lock_irqsave(&adb_handler_lock, flags); | |
522 | handler = adb_handler[id].handler; | |
523 | if (handler != NULL) | |
524 | adb_handler[id].busy = 1; | |
525 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
526 | if (handler != NULL) { | |
7d12e780 | 527 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
528 | wmb(); |
529 | adb_handler[id].busy = 0; | |
530 | } | |
531 | ||
532 | } | |
533 | ||
534 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
535 | static int try_handler_change(int address, int new_id) | |
536 | { | |
537 | struct adb_request req; | |
538 | ||
539 | if (adb_handler[address].handler_id == new_id) | |
540 | return 1; | |
541 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
542 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
543 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
544 | ADB_READREG(address, 3)); | |
545 | if (req.reply_len < 2) | |
546 | return 0; | |
547 | if (req.reply[2] != new_id) | |
548 | return 0; | |
549 | adb_handler[address].handler_id = req.reply[2]; | |
550 | ||
551 | return 1; | |
552 | } | |
553 | ||
554 | int | |
555 | adb_try_handler_change(int address, int new_id) | |
556 | { | |
557 | int ret; | |
558 | ||
af3ce514 | 559 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 560 | ret = try_handler_change(address, new_id); |
af3ce514 | 561 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
562 | return ret; |
563 | } | |
564 | ||
565 | int | |
566 | adb_get_infos(int address, int *original_address, int *handler_id) | |
567 | { | |
af3ce514 | 568 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
569 | *original_address = adb_handler[address].original_address; |
570 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 571 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
572 | |
573 | return (*original_address != 0); | |
574 | } | |
575 | ||
576 | ||
577 | /* | |
578 | * /dev/adb device driver. | |
579 | */ | |
580 | ||
581 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
582 | ||
583 | struct adbdev_state { | |
584 | spinlock_t lock; | |
585 | atomic_t n_pending; | |
586 | struct adb_request *completed; | |
587 | wait_queue_head_t wait_queue; | |
588 | int inuse; | |
589 | }; | |
590 | ||
591 | static void adb_write_done(struct adb_request *req) | |
592 | { | |
593 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
594 | unsigned long flags; | |
595 | ||
596 | if (!req->complete) { | |
597 | req->reply_len = 0; | |
598 | req->complete = 1; | |
599 | } | |
600 | spin_lock_irqsave(&state->lock, flags); | |
601 | atomic_dec(&state->n_pending); | |
602 | if (!state->inuse) { | |
603 | kfree(req); | |
604 | if (atomic_read(&state->n_pending) == 0) { | |
605 | spin_unlock_irqrestore(&state->lock, flags); | |
606 | kfree(state); | |
607 | return; | |
608 | } | |
609 | } else { | |
610 | struct adb_request **ap = &state->completed; | |
611 | while (*ap != NULL) | |
612 | ap = &(*ap)->next; | |
613 | req->next = NULL; | |
614 | *ap = req; | |
615 | wake_up_interruptible(&state->wait_queue); | |
616 | } | |
617 | spin_unlock_irqrestore(&state->lock, flags); | |
618 | } | |
619 | ||
620 | static int | |
621 | do_adb_query(struct adb_request *req) | |
622 | { | |
623 | int ret = -EINVAL; | |
624 | ||
625 | switch(req->data[1]) | |
626 | { | |
627 | case ADB_QUERY_GETDEVINFO: | |
628 | if (req->nbytes < 3) | |
629 | break; | |
af3ce514 | 630 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
631 | req->reply[0] = adb_handler[req->data[2]].original_address; |
632 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 633 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
634 | req->complete = 1; |
635 | req->reply_len = 2; | |
636 | adb_write_done(req); | |
637 | ret = 0; | |
638 | break; | |
639 | } | |
640 | return ret; | |
641 | } | |
642 | ||
643 | static int adb_open(struct inode *inode, struct file *file) | |
644 | { | |
645 | struct adbdev_state *state; | |
26ce4f06 | 646 | int ret = 0; |
1da177e4 | 647 | |
26ce4f06 JC |
648 | lock_kernel(); |
649 | if (iminor(inode) > 0 || adb_controller == NULL) { | |
650 | ret = -ENXIO; | |
651 | goto out; | |
652 | } | |
1da177e4 | 653 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
26ce4f06 JC |
654 | if (state == 0) { |
655 | ret = -ENOMEM; | |
656 | goto out; | |
657 | } | |
1da177e4 LT |
658 | file->private_data = state; |
659 | spin_lock_init(&state->lock); | |
660 | atomic_set(&state->n_pending, 0); | |
661 | state->completed = NULL; | |
662 | init_waitqueue_head(&state->wait_queue); | |
663 | state->inuse = 1; | |
664 | ||
26ce4f06 JC |
665 | out: |
666 | unlock_kernel(); | |
667 | return ret; | |
1da177e4 LT |
668 | } |
669 | ||
670 | static int adb_release(struct inode *inode, struct file *file) | |
671 | { | |
672 | struct adbdev_state *state = file->private_data; | |
673 | unsigned long flags; | |
674 | ||
675 | lock_kernel(); | |
676 | if (state) { | |
677 | file->private_data = NULL; | |
678 | spin_lock_irqsave(&state->lock, flags); | |
679 | if (atomic_read(&state->n_pending) == 0 | |
680 | && state->completed == NULL) { | |
681 | spin_unlock_irqrestore(&state->lock, flags); | |
682 | kfree(state); | |
683 | } else { | |
684 | state->inuse = 0; | |
685 | spin_unlock_irqrestore(&state->lock, flags); | |
686 | } | |
687 | } | |
688 | unlock_kernel(); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static ssize_t adb_read(struct file *file, char __user *buf, | |
693 | size_t count, loff_t *ppos) | |
694 | { | |
695 | int ret = 0; | |
696 | struct adbdev_state *state = file->private_data; | |
697 | struct adb_request *req; | |
698 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
699 | unsigned long flags; | |
700 | ||
701 | if (count < 2) | |
702 | return -EINVAL; | |
703 | if (count > sizeof(req->reply)) | |
704 | count = sizeof(req->reply); | |
705 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
706 | return -EFAULT; | |
707 | ||
708 | req = NULL; | |
709 | spin_lock_irqsave(&state->lock, flags); | |
710 | add_wait_queue(&state->wait_queue, &wait); | |
711 | current->state = TASK_INTERRUPTIBLE; | |
712 | ||
713 | for (;;) { | |
714 | req = state->completed; | |
715 | if (req != NULL) | |
716 | state->completed = req->next; | |
717 | else if (atomic_read(&state->n_pending) == 0) | |
718 | ret = -EIO; | |
719 | if (req != NULL || ret != 0) | |
720 | break; | |
721 | ||
722 | if (file->f_flags & O_NONBLOCK) { | |
723 | ret = -EAGAIN; | |
724 | break; | |
725 | } | |
726 | if (signal_pending(current)) { | |
727 | ret = -ERESTARTSYS; | |
728 | break; | |
729 | } | |
730 | spin_unlock_irqrestore(&state->lock, flags); | |
731 | schedule(); | |
732 | spin_lock_irqsave(&state->lock, flags); | |
733 | } | |
734 | ||
735 | current->state = TASK_RUNNING; | |
736 | remove_wait_queue(&state->wait_queue, &wait); | |
737 | spin_unlock_irqrestore(&state->lock, flags); | |
738 | ||
739 | if (ret) | |
740 | return ret; | |
741 | ||
742 | ret = req->reply_len; | |
743 | if (ret > count) | |
744 | ret = count; | |
745 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
746 | ret = -EFAULT; | |
747 | ||
748 | kfree(req); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
753 | size_t count, loff_t *ppos) | |
754 | { | |
755 | int ret/*, i*/; | |
756 | struct adbdev_state *state = file->private_data; | |
757 | struct adb_request *req; | |
758 | ||
759 | if (count < 2 || count > sizeof(req->data)) | |
760 | return -EINVAL; | |
761 | if (adb_controller == NULL) | |
762 | return -ENXIO; | |
763 | if (!access_ok(VERIFY_READ, buf, count)) | |
764 | return -EFAULT; | |
765 | ||
5cbded58 | 766 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
767 | GFP_KERNEL); |
768 | if (req == NULL) | |
769 | return -ENOMEM; | |
770 | ||
771 | req->nbytes = count; | |
772 | req->done = adb_write_done; | |
773 | req->arg = (void *) state; | |
774 | req->complete = 0; | |
775 | ||
776 | ret = -EFAULT; | |
777 | if (copy_from_user(req->data, buf, count)) | |
778 | goto out; | |
779 | ||
780 | atomic_inc(&state->n_pending); | |
781 | ||
782 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
783 | down(&adb_probe_mutex); | |
784 | ||
785 | /* Queries are special requests sent to the ADB driver itself */ | |
786 | if (req->data[0] == ADB_QUERY) { | |
787 | if (count > 1) | |
788 | ret = do_adb_query(req); | |
789 | else | |
790 | ret = -EINVAL; | |
791 | up(&adb_probe_mutex); | |
792 | } | |
793 | /* Special case for ADB_BUSRESET request, all others are sent to | |
794 | the controller */ | |
795 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
796 | &&(req->data[1] == ADB_BUSRESET)) { | |
797 | ret = do_adb_reset_bus(); | |
798 | up(&adb_probe_mutex); | |
799 | atomic_dec(&state->n_pending); | |
800 | if (ret == 0) | |
801 | ret = count; | |
802 | goto out; | |
803 | } else { | |
804 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
805 | if (adb_controller && adb_controller->send_request) | |
806 | ret = adb_controller->send_request(req, 0); | |
807 | else | |
808 | ret = -ENXIO; | |
809 | up(&adb_probe_mutex); | |
810 | } | |
811 | ||
812 | if (ret != 0) { | |
813 | atomic_dec(&state->n_pending); | |
814 | goto out; | |
815 | } | |
816 | return count; | |
817 | ||
818 | out: | |
819 | kfree(req); | |
820 | return ret; | |
821 | } | |
822 | ||
fa027c2a | 823 | static const struct file_operations adb_fops = { |
1da177e4 LT |
824 | .owner = THIS_MODULE, |
825 | .llseek = no_llseek, | |
826 | .read = adb_read, | |
827 | .write = adb_write, | |
828 | .open = adb_open, | |
829 | .release = adb_release, | |
830 | }; | |
831 | ||
c9f6d3d5 JB |
832 | static struct platform_driver adb_pfdrv = { |
833 | .driver = { | |
834 | .name = "adb", | |
835 | }, | |
836 | #ifdef CONFIG_PM | |
837 | .suspend = adb_suspend, | |
838 | .resume = adb_resume, | |
839 | #endif | |
840 | }; | |
841 | ||
842 | static struct platform_device adb_pfdev = { | |
843 | .name = "adb", | |
844 | }; | |
845 | ||
846 | static int __init | |
847 | adb_dummy_probe(struct platform_device *dev) | |
848 | { | |
849 | if (dev == &adb_pfdev) | |
850 | return 0; | |
851 | return -ENODEV; | |
852 | } | |
853 | ||
854 | static void __init | |
1da177e4 LT |
855 | adbdev_init(void) |
856 | { | |
857 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
858 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
859 | return; | |
860 | } | |
861 | ||
56b22935 | 862 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
863 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 864 | return; |
a9b12619 | 865 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
c9f6d3d5 JB |
866 | |
867 | platform_device_register(&adb_pfdev); | |
868 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 869 | } |