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 | 40 | |
74e7cd43 | 41 | #include <linux/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; | |
74e7cd43 | 196 | } else { |
1da177e4 LT |
197 | /* |
198 | * No devices left at address i; move the | |
199 | * one(s) we moved to `highFree' back to i. | |
200 | */ | |
201 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
202 | (highFree << 4) | 0xb, | |
203 | (i | 0x60), 0xfe); | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
209 | printk(KERN_DEBUG "adb devices:"); | |
210 | for (i = 1; i < 16; i++) { | |
211 | if (adb_handler[i].original_address == 0) | |
212 | continue; | |
213 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
214 | (i << 4) | 0xf); | |
215 | adb_handler[i].handler_id = req.reply[2]; | |
216 | printk(" [%d]: %d %x", i, adb_handler[i].original_address, | |
217 | adb_handler[i].handler_id); | |
218 | devmask |= 1 << i; | |
219 | } | |
220 | printk("\n"); | |
221 | return devmask; | |
222 | } | |
223 | ||
224 | /* | |
225 | * This kernel task handles ADB probing. It dies once probing is | |
226 | * completed. | |
227 | */ | |
228 | static int | |
229 | adb_probe_task(void *x) | |
230 | { | |
1da177e4 LT |
231 | printk(KERN_INFO "adb: starting probe task...\n"); |
232 | do_adb_reset_bus(); | |
233 | printk(KERN_INFO "adb: finished probe task...\n"); | |
1b6dd9ba | 234 | |
1da177e4 | 235 | up(&adb_probe_mutex); |
1b6dd9ba | 236 | |
1da177e4 LT |
237 | return 0; |
238 | } | |
239 | ||
240 | static void | |
3e577a80 | 241 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 | 242 | { |
c61dace9 | 243 | kthread_run(adb_probe_task, NULL, "kadbprobe"); |
1da177e4 LT |
244 | } |
245 | ||
3e577a80 | 246 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
247 | |
248 | int | |
249 | adb_reset_bus(void) | |
250 | { | |
251 | if (__adb_probe_sync) { | |
252 | do_adb_reset_bus(); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | down(&adb_probe_mutex); | |
257 | schedule_work(&adb_reset_work); | |
258 | return 0; | |
259 | } | |
260 | ||
c9f6d3d5 JB |
261 | #ifdef CONFIG_PM |
262 | /* | |
263 | * notify clients before sleep | |
264 | */ | |
639291f2 | 265 | static int __adb_suspend(struct platform_device *dev, pm_message_t state) |
c9f6d3d5 JB |
266 | { |
267 | adb_got_sleep = 1; | |
268 | /* We need to get a lock on the probe thread */ | |
269 | down(&adb_probe_mutex); | |
270 | /* Stop autopoll */ | |
271 | if (adb_controller->autopoll) | |
272 | adb_controller->autopoll(0); | |
273 | blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
639291f2 SK |
278 | static int adb_suspend(struct device *dev) |
279 | { | |
280 | return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND); | |
281 | } | |
282 | ||
283 | static int adb_freeze(struct device *dev) | |
284 | { | |
285 | return __adb_suspend(to_platform_device(dev), PMSG_FREEZE); | |
286 | } | |
287 | ||
288 | static int adb_poweroff(struct device *dev) | |
289 | { | |
290 | return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE); | |
291 | } | |
292 | ||
c9f6d3d5 JB |
293 | /* |
294 | * reset bus after sleep | |
295 | */ | |
639291f2 | 296 | static int __adb_resume(struct platform_device *dev) |
c9f6d3d5 JB |
297 | { |
298 | adb_got_sleep = 0; | |
299 | up(&adb_probe_mutex); | |
300 | adb_reset_bus(); | |
301 | ||
302 | return 0; | |
303 | } | |
639291f2 SK |
304 | |
305 | static int adb_resume(struct device *dev) | |
306 | { | |
307 | return __adb_resume(to_platform_device(dev)); | |
308 | } | |
c9f6d3d5 JB |
309 | #endif /* CONFIG_PM */ |
310 | ||
9b4a8dd2 | 311 | static int __init adb_init(void) |
1da177e4 LT |
312 | { |
313 | struct adb_driver *driver; | |
314 | int i; | |
315 | ||
316 | #ifdef CONFIG_PPC32 | |
e8222502 | 317 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
318 | return 0; |
319 | #endif | |
320 | #ifdef CONFIG_MAC | |
321 | if (!MACH_IS_MAC) | |
322 | return 0; | |
323 | #endif | |
324 | ||
325 | /* xmon may do early-init */ | |
326 | if (adb_inited) | |
327 | return 0; | |
328 | adb_inited = 1; | |
329 | ||
330 | adb_controller = NULL; | |
331 | ||
332 | i = 0; | |
333 | while ((driver = adb_driver_list[i++]) != NULL) { | |
334 | if (!driver->probe()) { | |
335 | adb_controller = driver; | |
336 | break; | |
337 | } | |
338 | } | |
18814ee8 FT |
339 | if (adb_controller != NULL && adb_controller->init && |
340 | adb_controller->init()) | |
1da177e4 | 341 | adb_controller = NULL; |
18814ee8 FT |
342 | if (adb_controller == NULL) { |
343 | printk(KERN_WARNING "Warning: no ADB interface detected\n"); | |
1da177e4 | 344 | } else { |
1da177e4 | 345 | #ifdef CONFIG_PPC |
71a157e8 GL |
346 | if (of_machine_is_compatible("AAPL,PowerBook1998") || |
347 | of_machine_is_compatible("PowerBook1,1")) | |
1da177e4 LT |
348 | sleepy_trackpad = 1; |
349 | #endif /* CONFIG_PPC */ | |
c9f6d3d5 | 350 | |
1da177e4 LT |
351 | adbdev_init(); |
352 | adb_reset_bus(); | |
353 | } | |
354 | return 0; | |
355 | } | |
356 | ||
faa5b9da | 357 | device_initcall(adb_init); |
1da177e4 | 358 | |
1da177e4 LT |
359 | static int |
360 | do_adb_reset_bus(void) | |
361 | { | |
70b52b38 | 362 | int ret; |
1da177e4 LT |
363 | |
364 | if (adb_controller == NULL) | |
365 | return -ENXIO; | |
366 | ||
367 | if (adb_controller->autopoll) | |
368 | adb_controller->autopoll(0); | |
369 | ||
70b52b38 JB |
370 | blocking_notifier_call_chain(&adb_client_list, |
371 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
372 | |
373 | if (sleepy_trackpad) { | |
374 | /* Let the trackpad settle down */ | |
c61dace9 | 375 | msleep(500); |
1da177e4 LT |
376 | } |
377 | ||
af3ce514 | 378 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
379 | write_lock_irq(&adb_handler_lock); |
380 | memset(adb_handler, 0, sizeof(adb_handler)); | |
381 | write_unlock_irq(&adb_handler_lock); | |
382 | ||
383 | /* That one is still a bit synchronous, oh well... */ | |
384 | if (adb_controller->reset_bus) | |
385 | ret = adb_controller->reset_bus(); | |
386 | else | |
387 | ret = 0; | |
388 | ||
389 | if (sleepy_trackpad) { | |
390 | /* Let the trackpad settle down */ | |
c61dace9 | 391 | msleep(1500); |
1da177e4 LT |
392 | } |
393 | ||
394 | if (!ret) { | |
395 | autopoll_devs = adb_scan_bus(); | |
396 | if (adb_controller->autopoll) | |
397 | adb_controller->autopoll(autopoll_devs); | |
398 | } | |
af3ce514 | 399 | mutex_unlock(&adb_handler_mutex); |
1da177e4 | 400 | |
70b52b38 JB |
401 | blocking_notifier_call_chain(&adb_client_list, |
402 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
403 | |
404 | return ret; | |
405 | } | |
406 | ||
407 | void | |
408 | adb_poll(void) | |
409 | { | |
410 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
411 | return; | |
412 | adb_controller->poll(); | |
413 | } | |
414 | ||
c61dace9 | 415 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 416 | { |
c61dace9 | 417 | struct completion *comp = req->arg; |
1da177e4 | 418 | |
c61dace9 PM |
419 | complete(comp); |
420 | } | |
1da177e4 LT |
421 | |
422 | int | |
423 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
424 | int flags, int nbytes, ...) | |
425 | { | |
426 | va_list list; | |
c61dace9 | 427 | int i; |
1da177e4 | 428 | int rc; |
c61dace9 | 429 | struct completion comp; |
1da177e4 LT |
430 | |
431 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
432 | return -ENXIO; | |
433 | if (nbytes < 1) | |
434 | return -EINVAL; | |
c61dace9 | 435 | |
1da177e4 LT |
436 | req->nbytes = nbytes+1; |
437 | req->done = done; | |
438 | req->reply_expected = flags & ADBREQ_REPLY; | |
439 | req->data[0] = ADB_PACKET; | |
440 | va_start(list, nbytes); | |
441 | for (i = 0; i < nbytes; ++i) | |
442 | req->data[i+1] = va_arg(list, int); | |
443 | va_end(list); | |
444 | ||
445 | if (flags & ADBREQ_NOSEND) | |
446 | return 0; | |
447 | ||
c61dace9 PM |
448 | /* Synchronous requests block using an on-stack completion */ |
449 | if (flags & ADBREQ_SYNC) { | |
450 | WARN_ON(done); | |
451 | req->done = adb_sync_req_done; | |
452 | req->arg = ∁ | |
453 | init_completion(&comp); | |
1da177e4 LT |
454 | } |
455 | ||
c61dace9 PM |
456 | rc = adb_controller->send_request(req, 0); |
457 | ||
458 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
459 | wait_for_completion(&comp); | |
1da177e4 LT |
460 | |
461 | return rc; | |
462 | } | |
463 | ||
464 | /* Ultimately this should return the number of devices with | |
465 | the given default id. | |
466 | And it does it now ! Note: changed behaviour: This function | |
467 | will now register if default_id _and_ handler_id both match | |
468 | but handler_id can be left to 0 to match with default_id only. | |
469 | When handler_id is set, this function will try to adjust | |
470 | the handler_id id it doesn't match. */ | |
471 | int | |
472 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 473 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
474 | { |
475 | int i; | |
476 | ||
af3ce514 | 477 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
478 | ids->nids = 0; |
479 | for (i = 1; i < 16; i++) { | |
480 | if ((adb_handler[i].original_address == default_id) && | |
481 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
482 | try_handler_change(i, handler_id))) { | |
483 | if (adb_handler[i].handler != 0) { | |
484 | printk(KERN_ERR | |
485 | "Two handlers for ADB device %d\n", | |
486 | default_id); | |
487 | continue; | |
488 | } | |
489 | write_lock_irq(&adb_handler_lock); | |
490 | adb_handler[i].handler = handler; | |
491 | write_unlock_irq(&adb_handler_lock); | |
492 | ids->id[ids->nids++] = i; | |
493 | } | |
494 | } | |
af3ce514 | 495 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
496 | return ids->nids; |
497 | } | |
498 | ||
499 | int | |
500 | adb_unregister(int index) | |
501 | { | |
502 | int ret = -ENODEV; | |
503 | ||
af3ce514 | 504 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
505 | write_lock_irq(&adb_handler_lock); |
506 | if (adb_handler[index].handler) { | |
507 | while(adb_handler[index].busy) { | |
508 | write_unlock_irq(&adb_handler_lock); | |
509 | yield(); | |
510 | write_lock_irq(&adb_handler_lock); | |
511 | } | |
512 | ret = 0; | |
513 | adb_handler[index].handler = NULL; | |
514 | } | |
515 | write_unlock_irq(&adb_handler_lock); | |
af3ce514 | 516 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
517 | return ret; |
518 | } | |
519 | ||
520 | void | |
7d12e780 | 521 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
522 | { |
523 | int i, id; | |
74e7cd43 | 524 | static int dump_adb_input; |
1da177e4 LT |
525 | unsigned long flags; |
526 | ||
7d12e780 | 527 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
528 | |
529 | /* We skip keystrokes and mouse moves when the sleep process | |
530 | * has been started. We stop autopoll, but this is another security | |
531 | */ | |
532 | if (adb_got_sleep) | |
533 | return; | |
534 | ||
535 | id = buf[0] >> 4; | |
536 | if (dump_adb_input) { | |
537 | printk(KERN_INFO "adb packet: "); | |
538 | for (i = 0; i < nb; ++i) | |
539 | printk(" %x", buf[i]); | |
540 | printk(", id = %d\n", id); | |
541 | } | |
542 | write_lock_irqsave(&adb_handler_lock, flags); | |
543 | handler = adb_handler[id].handler; | |
544 | if (handler != NULL) | |
545 | adb_handler[id].busy = 1; | |
546 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
547 | if (handler != NULL) { | |
7d12e780 | 548 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
549 | wmb(); |
550 | adb_handler[id].busy = 0; | |
551 | } | |
552 | ||
553 | } | |
554 | ||
555 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
556 | static int try_handler_change(int address, int new_id) | |
557 | { | |
558 | struct adb_request req; | |
559 | ||
560 | if (adb_handler[address].handler_id == new_id) | |
561 | return 1; | |
562 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
563 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
564 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
565 | ADB_READREG(address, 3)); | |
566 | if (req.reply_len < 2) | |
567 | return 0; | |
568 | if (req.reply[2] != new_id) | |
569 | return 0; | |
570 | adb_handler[address].handler_id = req.reply[2]; | |
571 | ||
572 | return 1; | |
573 | } | |
574 | ||
575 | int | |
576 | adb_try_handler_change(int address, int new_id) | |
577 | { | |
578 | int ret; | |
579 | ||
af3ce514 | 580 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 581 | ret = try_handler_change(address, new_id); |
af3ce514 | 582 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
583 | return ret; |
584 | } | |
585 | ||
586 | int | |
587 | adb_get_infos(int address, int *original_address, int *handler_id) | |
588 | { | |
af3ce514 | 589 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
590 | *original_address = adb_handler[address].original_address; |
591 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 592 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
593 | |
594 | return (*original_address != 0); | |
595 | } | |
596 | ||
597 | ||
598 | /* | |
599 | * /dev/adb device driver. | |
600 | */ | |
601 | ||
602 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
603 | ||
604 | struct adbdev_state { | |
605 | spinlock_t lock; | |
606 | atomic_t n_pending; | |
607 | struct adb_request *completed; | |
608 | wait_queue_head_t wait_queue; | |
609 | int inuse; | |
610 | }; | |
611 | ||
612 | static void adb_write_done(struct adb_request *req) | |
613 | { | |
614 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
615 | unsigned long flags; | |
616 | ||
617 | if (!req->complete) { | |
618 | req->reply_len = 0; | |
619 | req->complete = 1; | |
620 | } | |
621 | spin_lock_irqsave(&state->lock, flags); | |
622 | atomic_dec(&state->n_pending); | |
623 | if (!state->inuse) { | |
624 | kfree(req); | |
625 | if (atomic_read(&state->n_pending) == 0) { | |
626 | spin_unlock_irqrestore(&state->lock, flags); | |
627 | kfree(state); | |
628 | return; | |
629 | } | |
630 | } else { | |
631 | struct adb_request **ap = &state->completed; | |
632 | while (*ap != NULL) | |
633 | ap = &(*ap)->next; | |
634 | req->next = NULL; | |
635 | *ap = req; | |
636 | wake_up_interruptible(&state->wait_queue); | |
637 | } | |
638 | spin_unlock_irqrestore(&state->lock, flags); | |
639 | } | |
640 | ||
641 | static int | |
642 | do_adb_query(struct adb_request *req) | |
643 | { | |
644 | int ret = -EINVAL; | |
645 | ||
74e7cd43 | 646 | switch(req->data[1]) { |
1da177e4 LT |
647 | case ADB_QUERY_GETDEVINFO: |
648 | if (req->nbytes < 3) | |
649 | break; | |
af3ce514 | 650 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
651 | req->reply[0] = adb_handler[req->data[2]].original_address; |
652 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 653 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
654 | req->complete = 1; |
655 | req->reply_len = 2; | |
656 | adb_write_done(req); | |
657 | ret = 0; | |
658 | break; | |
659 | } | |
660 | return ret; | |
661 | } | |
662 | ||
663 | static int adb_open(struct inode *inode, struct file *file) | |
664 | { | |
665 | struct adbdev_state *state; | |
26ce4f06 | 666 | int ret = 0; |
1da177e4 | 667 | |
d851b6e0 | 668 | mutex_lock(&adb_mutex); |
26ce4f06 JC |
669 | if (iminor(inode) > 0 || adb_controller == NULL) { |
670 | ret = -ENXIO; | |
671 | goto out; | |
672 | } | |
1da177e4 | 673 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
26ce4f06 JC |
674 | if (state == 0) { |
675 | ret = -ENOMEM; | |
676 | goto out; | |
677 | } | |
1da177e4 LT |
678 | file->private_data = state; |
679 | spin_lock_init(&state->lock); | |
680 | atomic_set(&state->n_pending, 0); | |
681 | state->completed = NULL; | |
682 | init_waitqueue_head(&state->wait_queue); | |
683 | state->inuse = 1; | |
684 | ||
26ce4f06 | 685 | out: |
d851b6e0 | 686 | mutex_unlock(&adb_mutex); |
26ce4f06 | 687 | return ret; |
1da177e4 LT |
688 | } |
689 | ||
690 | static int adb_release(struct inode *inode, struct file *file) | |
691 | { | |
692 | struct adbdev_state *state = file->private_data; | |
693 | unsigned long flags; | |
694 | ||
d851b6e0 | 695 | mutex_lock(&adb_mutex); |
1da177e4 LT |
696 | if (state) { |
697 | file->private_data = NULL; | |
698 | spin_lock_irqsave(&state->lock, flags); | |
699 | if (atomic_read(&state->n_pending) == 0 | |
700 | && state->completed == NULL) { | |
701 | spin_unlock_irqrestore(&state->lock, flags); | |
702 | kfree(state); | |
703 | } else { | |
704 | state->inuse = 0; | |
705 | spin_unlock_irqrestore(&state->lock, flags); | |
706 | } | |
707 | } | |
d851b6e0 | 708 | mutex_unlock(&adb_mutex); |
1da177e4 LT |
709 | return 0; |
710 | } | |
711 | ||
712 | static ssize_t adb_read(struct file *file, char __user *buf, | |
713 | size_t count, loff_t *ppos) | |
714 | { | |
715 | int ret = 0; | |
716 | struct adbdev_state *state = file->private_data; | |
717 | struct adb_request *req; | |
74e7cd43 | 718 | DECLARE_WAITQUEUE(wait, current); |
1da177e4 LT |
719 | unsigned long flags; |
720 | ||
721 | if (count < 2) | |
722 | return -EINVAL; | |
723 | if (count > sizeof(req->reply)) | |
724 | count = sizeof(req->reply); | |
725 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
726 | return -EFAULT; | |
727 | ||
728 | req = NULL; | |
729 | spin_lock_irqsave(&state->lock, flags); | |
730 | add_wait_queue(&state->wait_queue, &wait); | |
64f8c135 | 731 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
732 | |
733 | for (;;) { | |
734 | req = state->completed; | |
735 | if (req != NULL) | |
736 | state->completed = req->next; | |
737 | else if (atomic_read(&state->n_pending) == 0) | |
738 | ret = -EIO; | |
739 | if (req != NULL || ret != 0) | |
740 | break; | |
741 | ||
742 | if (file->f_flags & O_NONBLOCK) { | |
743 | ret = -EAGAIN; | |
744 | break; | |
745 | } | |
746 | if (signal_pending(current)) { | |
747 | ret = -ERESTARTSYS; | |
748 | break; | |
749 | } | |
750 | spin_unlock_irqrestore(&state->lock, flags); | |
751 | schedule(); | |
752 | spin_lock_irqsave(&state->lock, flags); | |
753 | } | |
754 | ||
64f8c135 | 755 | set_current_state(TASK_RUNNING); |
1da177e4 LT |
756 | remove_wait_queue(&state->wait_queue, &wait); |
757 | spin_unlock_irqrestore(&state->lock, flags); | |
758 | ||
759 | if (ret) | |
760 | return ret; | |
761 | ||
762 | ret = req->reply_len; | |
763 | if (ret > count) | |
764 | ret = count; | |
765 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
766 | ret = -EFAULT; | |
767 | ||
768 | kfree(req); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
773 | size_t count, loff_t *ppos) | |
774 | { | |
775 | int ret/*, i*/; | |
776 | struct adbdev_state *state = file->private_data; | |
777 | struct adb_request *req; | |
778 | ||
779 | if (count < 2 || count > sizeof(req->data)) | |
780 | return -EINVAL; | |
781 | if (adb_controller == NULL) | |
782 | return -ENXIO; | |
783 | if (!access_ok(VERIFY_READ, buf, count)) | |
784 | return -EFAULT; | |
785 | ||
5cbded58 | 786 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
787 | GFP_KERNEL); |
788 | if (req == NULL) | |
789 | return -ENOMEM; | |
790 | ||
791 | req->nbytes = count; | |
792 | req->done = adb_write_done; | |
793 | req->arg = (void *) state; | |
794 | req->complete = 0; | |
795 | ||
796 | ret = -EFAULT; | |
797 | if (copy_from_user(req->data, buf, count)) | |
798 | goto out; | |
799 | ||
800 | atomic_inc(&state->n_pending); | |
801 | ||
802 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
803 | down(&adb_probe_mutex); | |
804 | ||
805 | /* Queries are special requests sent to the ADB driver itself */ | |
806 | if (req->data[0] == ADB_QUERY) { | |
807 | if (count > 1) | |
808 | ret = do_adb_query(req); | |
809 | else | |
810 | ret = -EINVAL; | |
811 | up(&adb_probe_mutex); | |
812 | } | |
813 | /* Special case for ADB_BUSRESET request, all others are sent to | |
814 | the controller */ | |
74e7cd43 BS |
815 | else if ((req->data[0] == ADB_PACKET) && (count > 1) |
816 | && (req->data[1] == ADB_BUSRESET)) { | |
1da177e4 LT |
817 | ret = do_adb_reset_bus(); |
818 | up(&adb_probe_mutex); | |
819 | atomic_dec(&state->n_pending); | |
820 | if (ret == 0) | |
821 | ret = count; | |
822 | goto out; | |
823 | } else { | |
824 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
825 | if (adb_controller && adb_controller->send_request) | |
826 | ret = adb_controller->send_request(req, 0); | |
827 | else | |
828 | ret = -ENXIO; | |
829 | up(&adb_probe_mutex); | |
830 | } | |
831 | ||
832 | if (ret != 0) { | |
833 | atomic_dec(&state->n_pending); | |
834 | goto out; | |
835 | } | |
836 | return count; | |
837 | ||
838 | out: | |
839 | kfree(req); | |
840 | return ret; | |
841 | } | |
842 | ||
fa027c2a | 843 | static const struct file_operations adb_fops = { |
1da177e4 LT |
844 | .owner = THIS_MODULE, |
845 | .llseek = no_llseek, | |
846 | .read = adb_read, | |
847 | .write = adb_write, | |
848 | .open = adb_open, | |
849 | .release = adb_release, | |
850 | }; | |
851 | ||
639291f2 SK |
852 | #ifdef CONFIG_PM |
853 | static const struct dev_pm_ops adb_dev_pm_ops = { | |
854 | .suspend = adb_suspend, | |
855 | .resume = adb_resume, | |
856 | /* Hibernate hooks */ | |
857 | .freeze = adb_freeze, | |
858 | .thaw = adb_resume, | |
859 | .poweroff = adb_poweroff, | |
860 | .restore = adb_resume, | |
861 | }; | |
862 | #endif | |
863 | ||
c9f6d3d5 JB |
864 | static struct platform_driver adb_pfdrv = { |
865 | .driver = { | |
866 | .name = "adb", | |
c9f6d3d5 | 867 | #ifdef CONFIG_PM |
639291f2 | 868 | .pm = &adb_dev_pm_ops, |
c9f6d3d5 | 869 | #endif |
639291f2 | 870 | }, |
c9f6d3d5 JB |
871 | }; |
872 | ||
873 | static struct platform_device adb_pfdev = { | |
874 | .name = "adb", | |
875 | }; | |
876 | ||
877 | static int __init | |
878 | adb_dummy_probe(struct platform_device *dev) | |
879 | { | |
880 | if (dev == &adb_pfdev) | |
881 | return 0; | |
882 | return -ENODEV; | |
883 | } | |
884 | ||
885 | static void __init | |
1da177e4 LT |
886 | adbdev_init(void) |
887 | { | |
888 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
889 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
890 | return; | |
891 | } | |
892 | ||
56b22935 | 893 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
894 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 895 | return; |
a9b12619 | 896 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
c9f6d3d5 JB |
897 | |
898 | platform_device_register(&adb_pfdev); | |
899 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 900 | } |