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> | |
1da177e4 LT |
27 | #include <linux/adb.h> |
28 | #include <linux/cuda.h> | |
29 | #include <linux/pmu.h> | |
30 | #include <linux/notifier.h> | |
31 | #include <linux/wait.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/completion.h> | |
36 | #include <linux/device.h> | |
c61dace9 | 37 | #include <linux/kthread.h> |
fe2528b9 | 38 | #include <linux/platform_device.h> |
af3ce514 | 39 | #include <linux/mutex.h> |
1da177e4 LT |
40 | |
41 | #include <asm/uaccess.h> | |
1da177e4 LT |
42 | #ifdef CONFIG_PPC |
43 | #include <asm/prom.h> | |
e8222502 | 44 | #include <asm/machdep.h> |
1da177e4 LT |
45 | #endif |
46 | ||
47 | ||
1da177e4 LT |
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 | ||
d851b6e0 | 57 | static DEFINE_MUTEX(adb_mutex); |
1da177e4 LT |
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; | |
8192b1f6 | 86 | static DEFINE_SEMAPHORE(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 | } | |
18814ee8 FT |
320 | if (adb_controller != NULL && adb_controller->init && |
321 | adb_controller->init()) | |
1da177e4 | 322 | adb_controller = NULL; |
18814ee8 FT |
323 | if (adb_controller == NULL) { |
324 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
1da177e4 | 325 | } else { |
1da177e4 | 326 | #ifdef CONFIG_PPC |
71a157e8 GL |
327 | if (of_machine_is_compatible("AAPL,PowerBook1998") || |
328 | of_machine_is_compatible("PowerBook1,1")) | |
1da177e4 LT |
329 | sleepy_trackpad = 1; |
330 | #endif /* CONFIG_PPC */ | |
c9f6d3d5 | 331 | |
1da177e4 LT |
332 | adbdev_init(); |
333 | adb_reset_bus(); | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
faa5b9da | 338 | device_initcall(adb_init); |
1da177e4 | 339 | |
1da177e4 LT |
340 | static int |
341 | do_adb_reset_bus(void) | |
342 | { | |
70b52b38 | 343 | int ret; |
1da177e4 LT |
344 | |
345 | if (adb_controller == NULL) | |
346 | return -ENXIO; | |
347 | ||
348 | if (adb_controller->autopoll) | |
349 | adb_controller->autopoll(0); | |
350 | ||
70b52b38 JB |
351 | blocking_notifier_call_chain(&adb_client_list, |
352 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
353 | |
354 | if (sleepy_trackpad) { | |
355 | /* Let the trackpad settle down */ | |
c61dace9 | 356 | msleep(500); |
1da177e4 LT |
357 | } |
358 | ||
af3ce514 | 359 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
360 | write_lock_irq(&adb_handler_lock); |
361 | memset(adb_handler, 0, sizeof(adb_handler)); | |
362 | write_unlock_irq(&adb_handler_lock); | |
363 | ||
364 | /* That one is still a bit synchronous, oh well... */ | |
365 | if (adb_controller->reset_bus) | |
366 | ret = adb_controller->reset_bus(); | |
367 | else | |
368 | ret = 0; | |
369 | ||
370 | if (sleepy_trackpad) { | |
371 | /* Let the trackpad settle down */ | |
c61dace9 | 372 | msleep(1500); |
1da177e4 LT |
373 | } |
374 | ||
375 | if (!ret) { | |
376 | autopoll_devs = adb_scan_bus(); | |
377 | if (adb_controller->autopoll) | |
378 | adb_controller->autopoll(autopoll_devs); | |
379 | } | |
af3ce514 | 380 | mutex_unlock(&adb_handler_mutex); |
1da177e4 | 381 | |
70b52b38 JB |
382 | blocking_notifier_call_chain(&adb_client_list, |
383 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
384 | |
385 | return ret; | |
386 | } | |
387 | ||
388 | void | |
389 | adb_poll(void) | |
390 | { | |
391 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
392 | return; | |
393 | adb_controller->poll(); | |
394 | } | |
395 | ||
c61dace9 | 396 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 397 | { |
c61dace9 | 398 | struct completion *comp = req->arg; |
1da177e4 | 399 | |
c61dace9 PM |
400 | complete(comp); |
401 | } | |
1da177e4 LT |
402 | |
403 | int | |
404 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
405 | int flags, int nbytes, ...) | |
406 | { | |
407 | va_list list; | |
c61dace9 | 408 | int i; |
1da177e4 | 409 | int rc; |
c61dace9 | 410 | struct completion comp; |
1da177e4 LT |
411 | |
412 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
413 | return -ENXIO; | |
414 | if (nbytes < 1) | |
415 | return -EINVAL; | |
c61dace9 | 416 | |
1da177e4 LT |
417 | req->nbytes = nbytes+1; |
418 | req->done = done; | |
419 | req->reply_expected = flags & ADBREQ_REPLY; | |
420 | req->data[0] = ADB_PACKET; | |
421 | va_start(list, nbytes); | |
422 | for (i = 0; i < nbytes; ++i) | |
423 | req->data[i+1] = va_arg(list, int); | |
424 | va_end(list); | |
425 | ||
426 | if (flags & ADBREQ_NOSEND) | |
427 | return 0; | |
428 | ||
c61dace9 PM |
429 | /* Synchronous requests block using an on-stack completion */ |
430 | if (flags & ADBREQ_SYNC) { | |
431 | WARN_ON(done); | |
432 | req->done = adb_sync_req_done; | |
433 | req->arg = ∁ | |
434 | init_completion(&comp); | |
1da177e4 LT |
435 | } |
436 | ||
c61dace9 PM |
437 | rc = adb_controller->send_request(req, 0); |
438 | ||
439 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
440 | wait_for_completion(&comp); | |
1da177e4 LT |
441 | |
442 | return rc; | |
443 | } | |
444 | ||
445 | /* Ultimately this should return the number of devices with | |
446 | the given default id. | |
447 | And it does it now ! Note: changed behaviour: This function | |
448 | will now register if default_id _and_ handler_id both match | |
449 | but handler_id can be left to 0 to match with default_id only. | |
450 | When handler_id is set, this function will try to adjust | |
451 | the handler_id id it doesn't match. */ | |
452 | int | |
453 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 454 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
455 | { |
456 | int i; | |
457 | ||
af3ce514 | 458 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
459 | ids->nids = 0; |
460 | for (i = 1; i < 16; i++) { | |
461 | if ((adb_handler[i].original_address == default_id) && | |
462 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
463 | try_handler_change(i, handler_id))) { | |
464 | if (adb_handler[i].handler != 0) { | |
465 | printk(KERN_ERR | |
466 | "Two handlers for ADB device %d\n", | |
467 | default_id); | |
468 | continue; | |
469 | } | |
470 | write_lock_irq(&adb_handler_lock); | |
471 | adb_handler[i].handler = handler; | |
472 | write_unlock_irq(&adb_handler_lock); | |
473 | ids->id[ids->nids++] = i; | |
474 | } | |
475 | } | |
af3ce514 | 476 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
477 | return ids->nids; |
478 | } | |
479 | ||
480 | int | |
481 | adb_unregister(int index) | |
482 | { | |
483 | int ret = -ENODEV; | |
484 | ||
af3ce514 | 485 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
486 | write_lock_irq(&adb_handler_lock); |
487 | if (adb_handler[index].handler) { | |
488 | while(adb_handler[index].busy) { | |
489 | write_unlock_irq(&adb_handler_lock); | |
490 | yield(); | |
491 | write_lock_irq(&adb_handler_lock); | |
492 | } | |
493 | ret = 0; | |
494 | adb_handler[index].handler = NULL; | |
495 | } | |
496 | write_unlock_irq(&adb_handler_lock); | |
af3ce514 | 497 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
498 | return ret; |
499 | } | |
500 | ||
501 | void | |
7d12e780 | 502 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
503 | { |
504 | int i, id; | |
505 | static int dump_adb_input = 0; | |
506 | unsigned long flags; | |
507 | ||
7d12e780 | 508 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
509 | |
510 | /* We skip keystrokes and mouse moves when the sleep process | |
511 | * has been started. We stop autopoll, but this is another security | |
512 | */ | |
513 | if (adb_got_sleep) | |
514 | return; | |
515 | ||
516 | id = buf[0] >> 4; | |
517 | if (dump_adb_input) { | |
518 | printk(KERN_INFO "adb packet: "); | |
519 | for (i = 0; i < nb; ++i) | |
520 | printk(" %x", buf[i]); | |
521 | printk(", id = %d\n", id); | |
522 | } | |
523 | write_lock_irqsave(&adb_handler_lock, flags); | |
524 | handler = adb_handler[id].handler; | |
525 | if (handler != NULL) | |
526 | adb_handler[id].busy = 1; | |
527 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
528 | if (handler != NULL) { | |
7d12e780 | 529 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
530 | wmb(); |
531 | adb_handler[id].busy = 0; | |
532 | } | |
533 | ||
534 | } | |
535 | ||
536 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
537 | static int try_handler_change(int address, int new_id) | |
538 | { | |
539 | struct adb_request req; | |
540 | ||
541 | if (adb_handler[address].handler_id == new_id) | |
542 | return 1; | |
543 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
544 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
545 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
546 | ADB_READREG(address, 3)); | |
547 | if (req.reply_len < 2) | |
548 | return 0; | |
549 | if (req.reply[2] != new_id) | |
550 | return 0; | |
551 | adb_handler[address].handler_id = req.reply[2]; | |
552 | ||
553 | return 1; | |
554 | } | |
555 | ||
556 | int | |
557 | adb_try_handler_change(int address, int new_id) | |
558 | { | |
559 | int ret; | |
560 | ||
af3ce514 | 561 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 562 | ret = try_handler_change(address, new_id); |
af3ce514 | 563 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
564 | return ret; |
565 | } | |
566 | ||
567 | int | |
568 | adb_get_infos(int address, int *original_address, int *handler_id) | |
569 | { | |
af3ce514 | 570 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
571 | *original_address = adb_handler[address].original_address; |
572 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 573 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
574 | |
575 | return (*original_address != 0); | |
576 | } | |
577 | ||
578 | ||
579 | /* | |
580 | * /dev/adb device driver. | |
581 | */ | |
582 | ||
583 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
584 | ||
585 | struct adbdev_state { | |
586 | spinlock_t lock; | |
587 | atomic_t n_pending; | |
588 | struct adb_request *completed; | |
589 | wait_queue_head_t wait_queue; | |
590 | int inuse; | |
591 | }; | |
592 | ||
593 | static void adb_write_done(struct adb_request *req) | |
594 | { | |
595 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
596 | unsigned long flags; | |
597 | ||
598 | if (!req->complete) { | |
599 | req->reply_len = 0; | |
600 | req->complete = 1; | |
601 | } | |
602 | spin_lock_irqsave(&state->lock, flags); | |
603 | atomic_dec(&state->n_pending); | |
604 | if (!state->inuse) { | |
605 | kfree(req); | |
606 | if (atomic_read(&state->n_pending) == 0) { | |
607 | spin_unlock_irqrestore(&state->lock, flags); | |
608 | kfree(state); | |
609 | return; | |
610 | } | |
611 | } else { | |
612 | struct adb_request **ap = &state->completed; | |
613 | while (*ap != NULL) | |
614 | ap = &(*ap)->next; | |
615 | req->next = NULL; | |
616 | *ap = req; | |
617 | wake_up_interruptible(&state->wait_queue); | |
618 | } | |
619 | spin_unlock_irqrestore(&state->lock, flags); | |
620 | } | |
621 | ||
622 | static int | |
623 | do_adb_query(struct adb_request *req) | |
624 | { | |
625 | int ret = -EINVAL; | |
626 | ||
627 | switch(req->data[1]) | |
628 | { | |
629 | case ADB_QUERY_GETDEVINFO: | |
630 | if (req->nbytes < 3) | |
631 | break; | |
af3ce514 | 632 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
633 | req->reply[0] = adb_handler[req->data[2]].original_address; |
634 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 635 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
636 | req->complete = 1; |
637 | req->reply_len = 2; | |
638 | adb_write_done(req); | |
639 | ret = 0; | |
640 | break; | |
641 | } | |
642 | return ret; | |
643 | } | |
644 | ||
645 | static int adb_open(struct inode *inode, struct file *file) | |
646 | { | |
647 | struct adbdev_state *state; | |
26ce4f06 | 648 | int ret = 0; |
1da177e4 | 649 | |
d851b6e0 | 650 | mutex_lock(&adb_mutex); |
26ce4f06 JC |
651 | if (iminor(inode) > 0 || adb_controller == NULL) { |
652 | ret = -ENXIO; | |
653 | goto out; | |
654 | } | |
1da177e4 | 655 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
26ce4f06 JC |
656 | if (state == 0) { |
657 | ret = -ENOMEM; | |
658 | goto out; | |
659 | } | |
1da177e4 LT |
660 | file->private_data = state; |
661 | spin_lock_init(&state->lock); | |
662 | atomic_set(&state->n_pending, 0); | |
663 | state->completed = NULL; | |
664 | init_waitqueue_head(&state->wait_queue); | |
665 | state->inuse = 1; | |
666 | ||
26ce4f06 | 667 | out: |
d851b6e0 | 668 | mutex_unlock(&adb_mutex); |
26ce4f06 | 669 | return ret; |
1da177e4 LT |
670 | } |
671 | ||
672 | static int adb_release(struct inode *inode, struct file *file) | |
673 | { | |
674 | struct adbdev_state *state = file->private_data; | |
675 | unsigned long flags; | |
676 | ||
d851b6e0 | 677 | mutex_lock(&adb_mutex); |
1da177e4 LT |
678 | if (state) { |
679 | file->private_data = NULL; | |
680 | spin_lock_irqsave(&state->lock, flags); | |
681 | if (atomic_read(&state->n_pending) == 0 | |
682 | && state->completed == NULL) { | |
683 | spin_unlock_irqrestore(&state->lock, flags); | |
684 | kfree(state); | |
685 | } else { | |
686 | state->inuse = 0; | |
687 | spin_unlock_irqrestore(&state->lock, flags); | |
688 | } | |
689 | } | |
d851b6e0 | 690 | mutex_unlock(&adb_mutex); |
1da177e4 LT |
691 | return 0; |
692 | } | |
693 | ||
694 | static ssize_t adb_read(struct file *file, char __user *buf, | |
695 | size_t count, loff_t *ppos) | |
696 | { | |
697 | int ret = 0; | |
698 | struct adbdev_state *state = file->private_data; | |
699 | struct adb_request *req; | |
700 | wait_queue_t wait = __WAITQUEUE_INITIALIZER(wait,current); | |
701 | unsigned long flags; | |
702 | ||
703 | if (count < 2) | |
704 | return -EINVAL; | |
705 | if (count > sizeof(req->reply)) | |
706 | count = sizeof(req->reply); | |
707 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
708 | return -EFAULT; | |
709 | ||
710 | req = NULL; | |
711 | spin_lock_irqsave(&state->lock, flags); | |
712 | add_wait_queue(&state->wait_queue, &wait); | |
64f8c135 | 713 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
714 | |
715 | for (;;) { | |
716 | req = state->completed; | |
717 | if (req != NULL) | |
718 | state->completed = req->next; | |
719 | else if (atomic_read(&state->n_pending) == 0) | |
720 | ret = -EIO; | |
721 | if (req != NULL || ret != 0) | |
722 | break; | |
723 | ||
724 | if (file->f_flags & O_NONBLOCK) { | |
725 | ret = -EAGAIN; | |
726 | break; | |
727 | } | |
728 | if (signal_pending(current)) { | |
729 | ret = -ERESTARTSYS; | |
730 | break; | |
731 | } | |
732 | spin_unlock_irqrestore(&state->lock, flags); | |
733 | schedule(); | |
734 | spin_lock_irqsave(&state->lock, flags); | |
735 | } | |
736 | ||
64f8c135 | 737 | set_current_state(TASK_RUNNING); |
1da177e4 LT |
738 | remove_wait_queue(&state->wait_queue, &wait); |
739 | spin_unlock_irqrestore(&state->lock, flags); | |
740 | ||
741 | if (ret) | |
742 | return ret; | |
743 | ||
744 | ret = req->reply_len; | |
745 | if (ret > count) | |
746 | ret = count; | |
747 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
748 | ret = -EFAULT; | |
749 | ||
750 | kfree(req); | |
751 | return ret; | |
752 | } | |
753 | ||
754 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
755 | size_t count, loff_t *ppos) | |
756 | { | |
757 | int ret/*, i*/; | |
758 | struct adbdev_state *state = file->private_data; | |
759 | struct adb_request *req; | |
760 | ||
761 | if (count < 2 || count > sizeof(req->data)) | |
762 | return -EINVAL; | |
763 | if (adb_controller == NULL) | |
764 | return -ENXIO; | |
765 | if (!access_ok(VERIFY_READ, buf, count)) | |
766 | return -EFAULT; | |
767 | ||
5cbded58 | 768 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
769 | GFP_KERNEL); |
770 | if (req == NULL) | |
771 | return -ENOMEM; | |
772 | ||
773 | req->nbytes = count; | |
774 | req->done = adb_write_done; | |
775 | req->arg = (void *) state; | |
776 | req->complete = 0; | |
777 | ||
778 | ret = -EFAULT; | |
779 | if (copy_from_user(req->data, buf, count)) | |
780 | goto out; | |
781 | ||
782 | atomic_inc(&state->n_pending); | |
783 | ||
784 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
785 | down(&adb_probe_mutex); | |
786 | ||
787 | /* Queries are special requests sent to the ADB driver itself */ | |
788 | if (req->data[0] == ADB_QUERY) { | |
789 | if (count > 1) | |
790 | ret = do_adb_query(req); | |
791 | else | |
792 | ret = -EINVAL; | |
793 | up(&adb_probe_mutex); | |
794 | } | |
795 | /* Special case for ADB_BUSRESET request, all others are sent to | |
796 | the controller */ | |
797 | else if ((req->data[0] == ADB_PACKET)&&(count > 1) | |
798 | &&(req->data[1] == ADB_BUSRESET)) { | |
799 | ret = do_adb_reset_bus(); | |
800 | up(&adb_probe_mutex); | |
801 | atomic_dec(&state->n_pending); | |
802 | if (ret == 0) | |
803 | ret = count; | |
804 | goto out; | |
805 | } else { | |
806 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
807 | if (adb_controller && adb_controller->send_request) | |
808 | ret = adb_controller->send_request(req, 0); | |
809 | else | |
810 | ret = -ENXIO; | |
811 | up(&adb_probe_mutex); | |
812 | } | |
813 | ||
814 | if (ret != 0) { | |
815 | atomic_dec(&state->n_pending); | |
816 | goto out; | |
817 | } | |
818 | return count; | |
819 | ||
820 | out: | |
821 | kfree(req); | |
822 | return ret; | |
823 | } | |
824 | ||
fa027c2a | 825 | static const struct file_operations adb_fops = { |
1da177e4 LT |
826 | .owner = THIS_MODULE, |
827 | .llseek = no_llseek, | |
828 | .read = adb_read, | |
829 | .write = adb_write, | |
830 | .open = adb_open, | |
831 | .release = adb_release, | |
832 | }; | |
833 | ||
c9f6d3d5 JB |
834 | static struct platform_driver adb_pfdrv = { |
835 | .driver = { | |
836 | .name = "adb", | |
837 | }, | |
838 | #ifdef CONFIG_PM | |
839 | .suspend = adb_suspend, | |
840 | .resume = adb_resume, | |
841 | #endif | |
842 | }; | |
843 | ||
844 | static struct platform_device adb_pfdev = { | |
845 | .name = "adb", | |
846 | }; | |
847 | ||
848 | static int __init | |
849 | adb_dummy_probe(struct platform_device *dev) | |
850 | { | |
851 | if (dev == &adb_pfdev) | |
852 | return 0; | |
853 | return -ENODEV; | |
854 | } | |
855 | ||
856 | static void __init | |
1da177e4 LT |
857 | adbdev_init(void) |
858 | { | |
859 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
860 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
861 | return; | |
862 | } | |
863 | ||
56b22935 GKH |
864 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
865 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 866 | return; |
a9b12619 | 867 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
c9f6d3d5 JB |
868 | |
869 | platform_device_register(&adb_pfdev); | |
870 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 871 | } |