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 | } | |
370a3abd | 414 | EXPORT_SYMBOL(adb_poll); |
1da177e4 | 415 | |
c61dace9 | 416 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 417 | { |
c61dace9 | 418 | struct completion *comp = req->arg; |
1da177e4 | 419 | |
c61dace9 PM |
420 | complete(comp); |
421 | } | |
1da177e4 LT |
422 | |
423 | int | |
424 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
425 | int flags, int nbytes, ...) | |
426 | { | |
427 | va_list list; | |
c61dace9 | 428 | int i; |
1da177e4 | 429 | int rc; |
c61dace9 | 430 | struct completion comp; |
1da177e4 LT |
431 | |
432 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
433 | return -ENXIO; | |
434 | if (nbytes < 1) | |
435 | return -EINVAL; | |
c61dace9 | 436 | |
1da177e4 LT |
437 | req->nbytes = nbytes+1; |
438 | req->done = done; | |
439 | req->reply_expected = flags & ADBREQ_REPLY; | |
440 | req->data[0] = ADB_PACKET; | |
441 | va_start(list, nbytes); | |
442 | for (i = 0; i < nbytes; ++i) | |
443 | req->data[i+1] = va_arg(list, int); | |
444 | va_end(list); | |
445 | ||
446 | if (flags & ADBREQ_NOSEND) | |
447 | return 0; | |
448 | ||
c61dace9 PM |
449 | /* Synchronous requests block using an on-stack completion */ |
450 | if (flags & ADBREQ_SYNC) { | |
451 | WARN_ON(done); | |
452 | req->done = adb_sync_req_done; | |
453 | req->arg = ∁ | |
454 | init_completion(&comp); | |
1da177e4 LT |
455 | } |
456 | ||
c61dace9 PM |
457 | rc = adb_controller->send_request(req, 0); |
458 | ||
459 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
460 | wait_for_completion(&comp); | |
1da177e4 LT |
461 | |
462 | return rc; | |
463 | } | |
370a3abd | 464 | EXPORT_SYMBOL(adb_request); |
1da177e4 LT |
465 | |
466 | /* Ultimately this should return the number of devices with | |
467 | the given default id. | |
468 | And it does it now ! Note: changed behaviour: This function | |
469 | will now register if default_id _and_ handler_id both match | |
470 | but handler_id can be left to 0 to match with default_id only. | |
471 | When handler_id is set, this function will try to adjust | |
472 | the handler_id id it doesn't match. */ | |
473 | int | |
474 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 475 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
476 | { |
477 | int i; | |
478 | ||
af3ce514 | 479 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
480 | ids->nids = 0; |
481 | for (i = 1; i < 16; i++) { | |
482 | if ((adb_handler[i].original_address == default_id) && | |
483 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
484 | try_handler_change(i, handler_id))) { | |
485 | if (adb_handler[i].handler != 0) { | |
486 | printk(KERN_ERR | |
487 | "Two handlers for ADB device %d\n", | |
488 | default_id); | |
489 | continue; | |
490 | } | |
491 | write_lock_irq(&adb_handler_lock); | |
492 | adb_handler[i].handler = handler; | |
493 | write_unlock_irq(&adb_handler_lock); | |
494 | ids->id[ids->nids++] = i; | |
495 | } | |
496 | } | |
af3ce514 | 497 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
498 | return ids->nids; |
499 | } | |
370a3abd | 500 | EXPORT_SYMBOL(adb_register); |
1da177e4 LT |
501 | |
502 | int | |
503 | adb_unregister(int index) | |
504 | { | |
505 | int ret = -ENODEV; | |
506 | ||
af3ce514 | 507 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
508 | write_lock_irq(&adb_handler_lock); |
509 | if (adb_handler[index].handler) { | |
510 | while(adb_handler[index].busy) { | |
511 | write_unlock_irq(&adb_handler_lock); | |
512 | yield(); | |
513 | write_lock_irq(&adb_handler_lock); | |
514 | } | |
515 | ret = 0; | |
516 | adb_handler[index].handler = NULL; | |
517 | } | |
518 | write_unlock_irq(&adb_handler_lock); | |
af3ce514 | 519 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
520 | return ret; |
521 | } | |
370a3abd | 522 | EXPORT_SYMBOL(adb_unregister); |
1da177e4 LT |
523 | |
524 | void | |
7d12e780 | 525 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
526 | { |
527 | int i, id; | |
74e7cd43 | 528 | static int dump_adb_input; |
1da177e4 LT |
529 | unsigned long flags; |
530 | ||
7d12e780 | 531 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
532 | |
533 | /* We skip keystrokes and mouse moves when the sleep process | |
534 | * has been started. We stop autopoll, but this is another security | |
535 | */ | |
536 | if (adb_got_sleep) | |
537 | return; | |
538 | ||
539 | id = buf[0] >> 4; | |
540 | if (dump_adb_input) { | |
541 | printk(KERN_INFO "adb packet: "); | |
542 | for (i = 0; i < nb; ++i) | |
543 | printk(" %x", buf[i]); | |
544 | printk(", id = %d\n", id); | |
545 | } | |
546 | write_lock_irqsave(&adb_handler_lock, flags); | |
547 | handler = adb_handler[id].handler; | |
548 | if (handler != NULL) | |
549 | adb_handler[id].busy = 1; | |
550 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
551 | if (handler != NULL) { | |
7d12e780 | 552 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
553 | wmb(); |
554 | adb_handler[id].busy = 0; | |
555 | } | |
556 | ||
557 | } | |
558 | ||
559 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
560 | static int try_handler_change(int address, int new_id) | |
561 | { | |
562 | struct adb_request req; | |
563 | ||
564 | if (adb_handler[address].handler_id == new_id) | |
565 | return 1; | |
566 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
567 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
568 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
569 | ADB_READREG(address, 3)); | |
570 | if (req.reply_len < 2) | |
571 | return 0; | |
572 | if (req.reply[2] != new_id) | |
573 | return 0; | |
574 | adb_handler[address].handler_id = req.reply[2]; | |
575 | ||
576 | return 1; | |
577 | } | |
578 | ||
579 | int | |
580 | adb_try_handler_change(int address, int new_id) | |
581 | { | |
582 | int ret; | |
583 | ||
af3ce514 | 584 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 585 | ret = try_handler_change(address, new_id); |
af3ce514 | 586 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
587 | return ret; |
588 | } | |
370a3abd | 589 | EXPORT_SYMBOL(adb_try_handler_change); |
1da177e4 LT |
590 | |
591 | int | |
592 | adb_get_infos(int address, int *original_address, int *handler_id) | |
593 | { | |
af3ce514 | 594 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
595 | *original_address = adb_handler[address].original_address; |
596 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 597 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
598 | |
599 | return (*original_address != 0); | |
600 | } | |
601 | ||
602 | ||
603 | /* | |
604 | * /dev/adb device driver. | |
605 | */ | |
606 | ||
607 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
608 | ||
609 | struct adbdev_state { | |
610 | spinlock_t lock; | |
611 | atomic_t n_pending; | |
612 | struct adb_request *completed; | |
613 | wait_queue_head_t wait_queue; | |
614 | int inuse; | |
615 | }; | |
616 | ||
617 | static void adb_write_done(struct adb_request *req) | |
618 | { | |
619 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
620 | unsigned long flags; | |
621 | ||
622 | if (!req->complete) { | |
623 | req->reply_len = 0; | |
624 | req->complete = 1; | |
625 | } | |
626 | spin_lock_irqsave(&state->lock, flags); | |
627 | atomic_dec(&state->n_pending); | |
628 | if (!state->inuse) { | |
629 | kfree(req); | |
630 | if (atomic_read(&state->n_pending) == 0) { | |
631 | spin_unlock_irqrestore(&state->lock, flags); | |
632 | kfree(state); | |
633 | return; | |
634 | } | |
635 | } else { | |
636 | struct adb_request **ap = &state->completed; | |
637 | while (*ap != NULL) | |
638 | ap = &(*ap)->next; | |
639 | req->next = NULL; | |
640 | *ap = req; | |
641 | wake_up_interruptible(&state->wait_queue); | |
642 | } | |
643 | spin_unlock_irqrestore(&state->lock, flags); | |
644 | } | |
645 | ||
646 | static int | |
647 | do_adb_query(struct adb_request *req) | |
648 | { | |
649 | int ret = -EINVAL; | |
650 | ||
74e7cd43 | 651 | switch(req->data[1]) { |
1da177e4 LT |
652 | case ADB_QUERY_GETDEVINFO: |
653 | if (req->nbytes < 3) | |
654 | break; | |
af3ce514 | 655 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
656 | req->reply[0] = adb_handler[req->data[2]].original_address; |
657 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 658 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
659 | req->complete = 1; |
660 | req->reply_len = 2; | |
661 | adb_write_done(req); | |
662 | ret = 0; | |
663 | break; | |
664 | } | |
665 | return ret; | |
666 | } | |
667 | ||
668 | static int adb_open(struct inode *inode, struct file *file) | |
669 | { | |
670 | struct adbdev_state *state; | |
26ce4f06 | 671 | int ret = 0; |
1da177e4 | 672 | |
d851b6e0 | 673 | mutex_lock(&adb_mutex); |
26ce4f06 JC |
674 | if (iminor(inode) > 0 || adb_controller == NULL) { |
675 | ret = -ENXIO; | |
676 | goto out; | |
677 | } | |
1da177e4 | 678 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
26ce4f06 JC |
679 | if (state == 0) { |
680 | ret = -ENOMEM; | |
681 | goto out; | |
682 | } | |
1da177e4 LT |
683 | file->private_data = state; |
684 | spin_lock_init(&state->lock); | |
685 | atomic_set(&state->n_pending, 0); | |
686 | state->completed = NULL; | |
687 | init_waitqueue_head(&state->wait_queue); | |
688 | state->inuse = 1; | |
689 | ||
26ce4f06 | 690 | out: |
d851b6e0 | 691 | mutex_unlock(&adb_mutex); |
26ce4f06 | 692 | return ret; |
1da177e4 LT |
693 | } |
694 | ||
695 | static int adb_release(struct inode *inode, struct file *file) | |
696 | { | |
697 | struct adbdev_state *state = file->private_data; | |
698 | unsigned long flags; | |
699 | ||
d851b6e0 | 700 | mutex_lock(&adb_mutex); |
1da177e4 LT |
701 | if (state) { |
702 | file->private_data = NULL; | |
703 | spin_lock_irqsave(&state->lock, flags); | |
704 | if (atomic_read(&state->n_pending) == 0 | |
705 | && state->completed == NULL) { | |
706 | spin_unlock_irqrestore(&state->lock, flags); | |
707 | kfree(state); | |
708 | } else { | |
709 | state->inuse = 0; | |
710 | spin_unlock_irqrestore(&state->lock, flags); | |
711 | } | |
712 | } | |
d851b6e0 | 713 | mutex_unlock(&adb_mutex); |
1da177e4 LT |
714 | return 0; |
715 | } | |
716 | ||
717 | static ssize_t adb_read(struct file *file, char __user *buf, | |
718 | size_t count, loff_t *ppos) | |
719 | { | |
720 | int ret = 0; | |
721 | struct adbdev_state *state = file->private_data; | |
722 | struct adb_request *req; | |
74e7cd43 | 723 | DECLARE_WAITQUEUE(wait, current); |
1da177e4 LT |
724 | unsigned long flags; |
725 | ||
726 | if (count < 2) | |
727 | return -EINVAL; | |
728 | if (count > sizeof(req->reply)) | |
729 | count = sizeof(req->reply); | |
730 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
731 | return -EFAULT; | |
732 | ||
733 | req = NULL; | |
734 | spin_lock_irqsave(&state->lock, flags); | |
735 | add_wait_queue(&state->wait_queue, &wait); | |
64f8c135 | 736 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
737 | |
738 | for (;;) { | |
739 | req = state->completed; | |
740 | if (req != NULL) | |
741 | state->completed = req->next; | |
742 | else if (atomic_read(&state->n_pending) == 0) | |
743 | ret = -EIO; | |
744 | if (req != NULL || ret != 0) | |
745 | break; | |
746 | ||
747 | if (file->f_flags & O_NONBLOCK) { | |
748 | ret = -EAGAIN; | |
749 | break; | |
750 | } | |
751 | if (signal_pending(current)) { | |
752 | ret = -ERESTARTSYS; | |
753 | break; | |
754 | } | |
755 | spin_unlock_irqrestore(&state->lock, flags); | |
756 | schedule(); | |
757 | spin_lock_irqsave(&state->lock, flags); | |
758 | } | |
759 | ||
64f8c135 | 760 | set_current_state(TASK_RUNNING); |
1da177e4 LT |
761 | remove_wait_queue(&state->wait_queue, &wait); |
762 | spin_unlock_irqrestore(&state->lock, flags); | |
763 | ||
764 | if (ret) | |
765 | return ret; | |
766 | ||
767 | ret = req->reply_len; | |
768 | if (ret > count) | |
769 | ret = count; | |
770 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
771 | ret = -EFAULT; | |
772 | ||
773 | kfree(req); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
778 | size_t count, loff_t *ppos) | |
779 | { | |
780 | int ret/*, i*/; | |
781 | struct adbdev_state *state = file->private_data; | |
782 | struct adb_request *req; | |
783 | ||
784 | if (count < 2 || count > sizeof(req->data)) | |
785 | return -EINVAL; | |
786 | if (adb_controller == NULL) | |
787 | return -ENXIO; | |
788 | if (!access_ok(VERIFY_READ, buf, count)) | |
789 | return -EFAULT; | |
790 | ||
5cbded58 | 791 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
792 | GFP_KERNEL); |
793 | if (req == NULL) | |
794 | return -ENOMEM; | |
795 | ||
796 | req->nbytes = count; | |
797 | req->done = adb_write_done; | |
798 | req->arg = (void *) state; | |
799 | req->complete = 0; | |
800 | ||
801 | ret = -EFAULT; | |
802 | if (copy_from_user(req->data, buf, count)) | |
803 | goto out; | |
804 | ||
805 | atomic_inc(&state->n_pending); | |
806 | ||
807 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
808 | down(&adb_probe_mutex); | |
809 | ||
810 | /* Queries are special requests sent to the ADB driver itself */ | |
811 | if (req->data[0] == ADB_QUERY) { | |
812 | if (count > 1) | |
813 | ret = do_adb_query(req); | |
814 | else | |
815 | ret = -EINVAL; | |
816 | up(&adb_probe_mutex); | |
817 | } | |
818 | /* Special case for ADB_BUSRESET request, all others are sent to | |
819 | the controller */ | |
74e7cd43 BS |
820 | else if ((req->data[0] == ADB_PACKET) && (count > 1) |
821 | && (req->data[1] == ADB_BUSRESET)) { | |
1da177e4 LT |
822 | ret = do_adb_reset_bus(); |
823 | up(&adb_probe_mutex); | |
824 | atomic_dec(&state->n_pending); | |
825 | if (ret == 0) | |
826 | ret = count; | |
827 | goto out; | |
828 | } else { | |
829 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
830 | if (adb_controller && adb_controller->send_request) | |
831 | ret = adb_controller->send_request(req, 0); | |
832 | else | |
833 | ret = -ENXIO; | |
834 | up(&adb_probe_mutex); | |
835 | } | |
836 | ||
837 | if (ret != 0) { | |
838 | atomic_dec(&state->n_pending); | |
839 | goto out; | |
840 | } | |
841 | return count; | |
842 | ||
843 | out: | |
844 | kfree(req); | |
845 | return ret; | |
846 | } | |
847 | ||
fa027c2a | 848 | static const struct file_operations adb_fops = { |
1da177e4 LT |
849 | .owner = THIS_MODULE, |
850 | .llseek = no_llseek, | |
851 | .read = adb_read, | |
852 | .write = adb_write, | |
853 | .open = adb_open, | |
854 | .release = adb_release, | |
855 | }; | |
856 | ||
639291f2 SK |
857 | #ifdef CONFIG_PM |
858 | static const struct dev_pm_ops adb_dev_pm_ops = { | |
859 | .suspend = adb_suspend, | |
860 | .resume = adb_resume, | |
861 | /* Hibernate hooks */ | |
862 | .freeze = adb_freeze, | |
863 | .thaw = adb_resume, | |
864 | .poweroff = adb_poweroff, | |
865 | .restore = adb_resume, | |
866 | }; | |
867 | #endif | |
868 | ||
c9f6d3d5 JB |
869 | static struct platform_driver adb_pfdrv = { |
870 | .driver = { | |
871 | .name = "adb", | |
c9f6d3d5 | 872 | #ifdef CONFIG_PM |
639291f2 | 873 | .pm = &adb_dev_pm_ops, |
c9f6d3d5 | 874 | #endif |
639291f2 | 875 | }, |
c9f6d3d5 JB |
876 | }; |
877 | ||
878 | static struct platform_device adb_pfdev = { | |
879 | .name = "adb", | |
880 | }; | |
881 | ||
882 | static int __init | |
883 | adb_dummy_probe(struct platform_device *dev) | |
884 | { | |
885 | if (dev == &adb_pfdev) | |
886 | return 0; | |
887 | return -ENODEV; | |
888 | } | |
889 | ||
890 | static void __init | |
1da177e4 LT |
891 | adbdev_init(void) |
892 | { | |
893 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
894 | printk(KERN_ERR "adb: unable to get major %d\n", ADB_MAJOR); | |
895 | return; | |
896 | } | |
897 | ||
56b22935 | 898 | adb_dev_class = class_create(THIS_MODULE, "adb"); |
899 | if (IS_ERR(adb_dev_class)) | |
1da177e4 | 900 | return; |
a9b12619 | 901 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
c9f6d3d5 JB |
902 | |
903 | platform_device_register(&adb_pfdev); | |
904 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 905 | } |