Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Device driver for the Apple Desktop Bus | |
4 | * and the /dev/adb device on macintoshes. | |
5 | * | |
6 | * Copyright (C) 1996 Paul Mackerras. | |
7 | * | |
8 | * Modified to declare controllers as structures, added | |
9 | * client notification of bus reset and handles PowerBook | |
10 | * sleep, by Benjamin Herrenschmidt. | |
11 | * | |
12 | * To do: | |
13 | * | |
14 | * - /sys/bus/adb to list the devices and infos | |
15 | * - more /dev/adb to allow userland to receive the | |
16 | * flow of auto-polling datas from a given device. | |
17 | * - move bus probe to a kernel thread | |
18 | */ | |
19 | ||
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/mm.h> | |
174cd4b1 | 27 | #include <linux/sched/signal.h> |
1da177e4 LT |
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> |
a486e512 | 41 | #include <linux/of.h> |
1da177e4 | 42 | |
74e7cd43 | 43 | #include <linux/uaccess.h> |
1da177e4 | 44 | #ifdef CONFIG_PPC |
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; | |
1da177e4 LT |
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 | |
1da177e4 LT |
62 | #ifdef CONFIG_ADB_CUDA |
63 | &via_cuda_driver, | |
64 | #endif | |
65 | #ifdef CONFIG_ADB_IOP | |
66 | &adb_iop_driver, | |
67 | #endif | |
ebd72227 | 68 | #ifdef CONFIG_ADB_PMU |
1da177e4 LT |
69 | &via_pmu_driver, |
70 | #endif | |
71 | #ifdef CONFIG_ADB_MACIO | |
72 | &macio_adb_driver, | |
73 | #endif | |
74 | NULL | |
75 | }; | |
76 | ||
83bc680e RM |
77 | static const struct class adb_dev_class = { |
78 | .name = "adb", | |
79 | }; | |
1da177e4 | 80 | |
9b4a8dd2 | 81 | static struct adb_driver *adb_controller; |
e041c683 | 82 | BLOCKING_NOTIFIER_HEAD(adb_client_list); |
1da177e4 LT |
83 | static int adb_got_sleep; |
84 | static int adb_inited; | |
48380368 | 85 | static DEFINE_SEMAPHORE(adb_probe_mutex, 1); |
1da177e4 LT |
86 | static int sleepy_trackpad; |
87 | static int autopoll_devs; | |
88 | int __adb_probe_sync; | |
89 | ||
1da177e4 LT |
90 | static int adb_scan_bus(void); |
91 | static int do_adb_reset_bus(void); | |
92 | static void adbdev_init(void); | |
93 | static int try_handler_change(int, int); | |
94 | ||
95 | static struct adb_handler { | |
7d12e780 | 96 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
97 | int original_address; |
98 | int handler_id; | |
99 | int busy; | |
100 | } adb_handler[16]; | |
101 | ||
102 | /* | |
af3ce514 | 103 | * The adb_handler_mutex mutex protects all accesses to the original_address |
1da177e4 LT |
104 | * and handler_id fields of adb_handler[i] for all i, and changes to the |
105 | * handler field. | |
106 | * Accesses to the handler field are protected by the adb_handler_lock | |
107 | * rwlock. It is held across all calls to any handler, so that by the | |
108 | * time adb_unregister returns, we know that the old handler isn't being | |
109 | * called. | |
110 | */ | |
af3ce514 | 111 | static DEFINE_MUTEX(adb_handler_mutex); |
1da177e4 LT |
112 | static DEFINE_RWLOCK(adb_handler_lock); |
113 | ||
114 | #if 0 | |
115 | static void printADBreply(struct adb_request *req) | |
116 | { | |
117 | int i; | |
118 | ||
119 | printk("adb reply (%d)", req->reply_len); | |
120 | for(i = 0; i < req->reply_len; i++) | |
121 | printk(" %x", req->reply[i]); | |
122 | printk("\n"); | |
123 | ||
124 | } | |
125 | #endif | |
126 | ||
1da177e4 LT |
127 | static int adb_scan_bus(void) |
128 | { | |
129 | int i, highFree=0, noMovement; | |
130 | int devmask = 0; | |
131 | struct adb_request req; | |
132 | ||
133 | /* assumes adb_handler[] is all zeroes at this point */ | |
134 | for (i = 1; i < 16; i++) { | |
135 | /* see if there is anything at address i */ | |
136 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
137 | (i << 4) | 0xf); | |
138 | if (req.reply_len > 1) | |
139 | /* one or more devices at this address */ | |
140 | adb_handler[i].original_address = i; | |
141 | else if (i > highFree) | |
142 | highFree = i; | |
143 | } | |
144 | ||
145 | /* Note we reset noMovement to 0 each time we move a device */ | |
146 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
147 | for (i = 1; i < 16; i++) { | |
148 | if (adb_handler[i].original_address == 0) | |
149 | continue; | |
150 | /* | |
151 | * Send a "talk register 3" command to address i | |
152 | * to provoke a collision if there is more than | |
153 | * one device at this address. | |
154 | */ | |
155 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
156 | (i << 4) | 0xf); | |
157 | /* | |
158 | * Move the device(s) which didn't detect a | |
159 | * collision to address `highFree'. Hopefully | |
160 | * this only moves one device. | |
161 | */ | |
162 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
163 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
164 | /* | |
165 | * See if anybody actually moved. This is suggested | |
166 | * by HW TechNote 01: | |
167 | * | |
a7beab41 | 168 | * https://developer.apple.com/technotes/hw/hw_01.html |
1da177e4 LT |
169 | */ |
170 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
171 | (highFree << 4) | 0xf); | |
172 | if (req.reply_len <= 1) continue; | |
173 | /* | |
174 | * Test whether there are any device(s) left | |
175 | * at address i. | |
176 | */ | |
177 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
178 | (i << 4) | 0xf); | |
179 | if (req.reply_len > 1) { | |
180 | /* | |
181 | * There are still one or more devices | |
182 | * left at address i. Register the one(s) | |
183 | * we moved to `highFree', and find a new | |
184 | * value for highFree. | |
185 | */ | |
186 | adb_handler[highFree].original_address = | |
187 | adb_handler[i].original_address; | |
188 | while (highFree > 0 && | |
189 | adb_handler[highFree].original_address) | |
190 | highFree--; | |
191 | if (highFree <= 0) | |
192 | break; | |
193 | ||
194 | noMovement = 0; | |
74e7cd43 | 195 | } else { |
1da177e4 LT |
196 | /* |
197 | * No devices left at address i; move the | |
198 | * one(s) we moved to `highFree' back to i. | |
199 | */ | |
200 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
201 | (highFree << 4) | 0xb, | |
202 | (i | 0x60), 0xfe); | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
1da177e4 LT |
208 | for (i = 1; i < 16; i++) { |
209 | if (adb_handler[i].original_address == 0) | |
210 | continue; | |
211 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
212 | (i << 4) | 0xf); | |
213 | adb_handler[i].handler_id = req.reply[2]; | |
2341629e FT |
214 | printk(KERN_DEBUG "adb device [%d]: %d 0x%X\n", i, |
215 | adb_handler[i].original_address, | |
216 | adb_handler[i].handler_id); | |
1da177e4 LT |
217 | devmask |= 1 << i; |
218 | } | |
1da177e4 LT |
219 | return devmask; |
220 | } | |
221 | ||
222 | /* | |
223 | * This kernel task handles ADB probing. It dies once probing is | |
224 | * completed. | |
225 | */ | |
226 | static int | |
227 | adb_probe_task(void *x) | |
228 | { | |
f2be6295 | 229 | pr_debug("adb: starting probe task...\n"); |
1da177e4 | 230 | do_adb_reset_bus(); |
f2be6295 | 231 | pr_debug("adb: finished probe task...\n"); |
1b6dd9ba | 232 | |
1da177e4 | 233 | up(&adb_probe_mutex); |
1b6dd9ba | 234 | |
1da177e4 LT |
235 | return 0; |
236 | } | |
237 | ||
238 | static void | |
3e577a80 | 239 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 | 240 | { |
c61dace9 | 241 | kthread_run(adb_probe_task, NULL, "kadbprobe"); |
1da177e4 LT |
242 | } |
243 | ||
3e577a80 | 244 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
245 | |
246 | int | |
247 | adb_reset_bus(void) | |
248 | { | |
249 | if (__adb_probe_sync) { | |
250 | do_adb_reset_bus(); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | down(&adb_probe_mutex); | |
255 | schedule_work(&adb_reset_work); | |
256 | return 0; | |
257 | } | |
258 | ||
c9f6d3d5 JB |
259 | #ifdef CONFIG_PM |
260 | /* | |
261 | * notify clients before sleep | |
262 | */ | |
639291f2 | 263 | static int __adb_suspend(struct platform_device *dev, pm_message_t state) |
c9f6d3d5 JB |
264 | { |
265 | adb_got_sleep = 1; | |
266 | /* We need to get a lock on the probe thread */ | |
267 | down(&adb_probe_mutex); | |
268 | /* Stop autopoll */ | |
269 | if (adb_controller->autopoll) | |
270 | adb_controller->autopoll(0); | |
271 | blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
639291f2 SK |
276 | static int adb_suspend(struct device *dev) |
277 | { | |
278 | return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND); | |
279 | } | |
280 | ||
281 | static int adb_freeze(struct device *dev) | |
282 | { | |
283 | return __adb_suspend(to_platform_device(dev), PMSG_FREEZE); | |
284 | } | |
285 | ||
286 | static int adb_poweroff(struct device *dev) | |
287 | { | |
288 | return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE); | |
289 | } | |
290 | ||
c9f6d3d5 JB |
291 | /* |
292 | * reset bus after sleep | |
293 | */ | |
639291f2 | 294 | static int __adb_resume(struct platform_device *dev) |
c9f6d3d5 JB |
295 | { |
296 | adb_got_sleep = 0; | |
297 | up(&adb_probe_mutex); | |
298 | adb_reset_bus(); | |
299 | ||
300 | return 0; | |
301 | } | |
639291f2 SK |
302 | |
303 | static int adb_resume(struct device *dev) | |
304 | { | |
305 | return __adb_resume(to_platform_device(dev)); | |
306 | } | |
c9f6d3d5 JB |
307 | #endif /* CONFIG_PM */ |
308 | ||
9b4a8dd2 | 309 | static int __init adb_init(void) |
1da177e4 LT |
310 | { |
311 | struct adb_driver *driver; | |
312 | int i; | |
313 | ||
314 | #ifdef CONFIG_PPC32 | |
e8222502 | 315 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
316 | return 0; |
317 | #endif | |
318 | #ifdef CONFIG_MAC | |
319 | if (!MACH_IS_MAC) | |
320 | return 0; | |
321 | #endif | |
322 | ||
323 | /* xmon may do early-init */ | |
324 | if (adb_inited) | |
325 | return 0; | |
326 | adb_inited = 1; | |
327 | ||
328 | adb_controller = NULL; | |
329 | ||
330 | i = 0; | |
331 | while ((driver = adb_driver_list[i++]) != NULL) { | |
332 | if (!driver->probe()) { | |
333 | adb_controller = driver; | |
334 | break; | |
335 | } | |
336 | } | |
18814ee8 FT |
337 | if (adb_controller != NULL && adb_controller->init && |
338 | adb_controller->init()) | |
1da177e4 | 339 | adb_controller = NULL; |
18814ee8 | 340 | if (adb_controller == NULL) { |
f2be6295 | 341 | pr_warn("Warning: no ADB interface detected\n"); |
1da177e4 | 342 | } else { |
1da177e4 | 343 | #ifdef CONFIG_PPC |
71a157e8 GL |
344 | if (of_machine_is_compatible("AAPL,PowerBook1998") || |
345 | of_machine_is_compatible("PowerBook1,1")) | |
1da177e4 LT |
346 | sleepy_trackpad = 1; |
347 | #endif /* CONFIG_PPC */ | |
c9f6d3d5 | 348 | |
1da177e4 LT |
349 | adbdev_init(); |
350 | adb_reset_bus(); | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
faa5b9da | 355 | device_initcall(adb_init); |
1da177e4 | 356 | |
1da177e4 LT |
357 | static int |
358 | do_adb_reset_bus(void) | |
359 | { | |
70b52b38 | 360 | int ret; |
1da177e4 LT |
361 | |
362 | if (adb_controller == NULL) | |
363 | return -ENXIO; | |
364 | ||
365 | if (adb_controller->autopoll) | |
366 | adb_controller->autopoll(0); | |
367 | ||
70b52b38 JB |
368 | blocking_notifier_call_chain(&adb_client_list, |
369 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
370 | |
371 | if (sleepy_trackpad) { | |
372 | /* Let the trackpad settle down */ | |
c61dace9 | 373 | msleep(500); |
1da177e4 LT |
374 | } |
375 | ||
af3ce514 | 376 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
377 | write_lock_irq(&adb_handler_lock); |
378 | memset(adb_handler, 0, sizeof(adb_handler)); | |
379 | write_unlock_irq(&adb_handler_lock); | |
380 | ||
381 | /* That one is still a bit synchronous, oh well... */ | |
382 | if (adb_controller->reset_bus) | |
383 | ret = adb_controller->reset_bus(); | |
384 | else | |
385 | ret = 0; | |
386 | ||
387 | if (sleepy_trackpad) { | |
388 | /* Let the trackpad settle down */ | |
c61dace9 | 389 | msleep(1500); |
1da177e4 LT |
390 | } |
391 | ||
392 | if (!ret) { | |
393 | autopoll_devs = adb_scan_bus(); | |
394 | if (adb_controller->autopoll) | |
395 | adb_controller->autopoll(autopoll_devs); | |
396 | } | |
af3ce514 | 397 | mutex_unlock(&adb_handler_mutex); |
1da177e4 | 398 | |
70b52b38 JB |
399 | blocking_notifier_call_chain(&adb_client_list, |
400 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
401 | |
402 | return ret; | |
403 | } | |
404 | ||
405 | void | |
406 | adb_poll(void) | |
407 | { | |
408 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
409 | return; | |
410 | adb_controller->poll(); | |
411 | } | |
370a3abd | 412 | EXPORT_SYMBOL(adb_poll); |
1da177e4 | 413 | |
c61dace9 | 414 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 415 | { |
c61dace9 | 416 | struct completion *comp = req->arg; |
1da177e4 | 417 | |
c61dace9 PM |
418 | complete(comp); |
419 | } | |
1da177e4 LT |
420 | |
421 | int | |
422 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
423 | int flags, int nbytes, ...) | |
424 | { | |
425 | va_list list; | |
c61dace9 | 426 | int i; |
1da177e4 | 427 | int rc; |
c61dace9 | 428 | struct completion comp; |
1da177e4 LT |
429 | |
430 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
431 | return -ENXIO; | |
432 | if (nbytes < 1) | |
433 | return -EINVAL; | |
c61dace9 | 434 | |
1da177e4 LT |
435 | req->nbytes = nbytes+1; |
436 | req->done = done; | |
437 | req->reply_expected = flags & ADBREQ_REPLY; | |
438 | req->data[0] = ADB_PACKET; | |
439 | va_start(list, nbytes); | |
440 | for (i = 0; i < nbytes; ++i) | |
441 | req->data[i+1] = va_arg(list, int); | |
442 | va_end(list); | |
443 | ||
444 | if (flags & ADBREQ_NOSEND) | |
445 | return 0; | |
446 | ||
c61dace9 PM |
447 | /* Synchronous requests block using an on-stack completion */ |
448 | if (flags & ADBREQ_SYNC) { | |
449 | WARN_ON(done); | |
450 | req->done = adb_sync_req_done; | |
451 | req->arg = ∁ | |
452 | init_completion(&comp); | |
1da177e4 LT |
453 | } |
454 | ||
c61dace9 PM |
455 | rc = adb_controller->send_request(req, 0); |
456 | ||
457 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
458 | wait_for_completion(&comp); | |
1da177e4 LT |
459 | |
460 | return rc; | |
461 | } | |
370a3abd | 462 | EXPORT_SYMBOL(adb_request); |
1da177e4 LT |
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))) { | |
2f59562c | 483 | if (adb_handler[i].handler) { |
f2be6295 | 484 | pr_err("Two handlers for ADB device %d\n", |
1da177e4 LT |
485 | default_id); |
486 | continue; | |
487 | } | |
488 | write_lock_irq(&adb_handler_lock); | |
489 | adb_handler[i].handler = handler; | |
490 | write_unlock_irq(&adb_handler_lock); | |
491 | ids->id[ids->nids++] = i; | |
492 | } | |
493 | } | |
af3ce514 | 494 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
495 | return ids->nids; |
496 | } | |
370a3abd | 497 | EXPORT_SYMBOL(adb_register); |
1da177e4 LT |
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 | } | |
370a3abd | 519 | EXPORT_SYMBOL(adb_unregister); |
1da177e4 LT |
520 | |
521 | void | |
7d12e780 | 522 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
523 | { |
524 | int i, id; | |
74e7cd43 | 525 | static int dump_adb_input; |
1da177e4 LT |
526 | unsigned long flags; |
527 | ||
7d12e780 | 528 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
529 | |
530 | /* We skip keystrokes and mouse moves when the sleep process | |
531 | * has been started. We stop autopoll, but this is another security | |
532 | */ | |
533 | if (adb_got_sleep) | |
534 | return; | |
535 | ||
536 | id = buf[0] >> 4; | |
537 | if (dump_adb_input) { | |
f2be6295 | 538 | pr_info("adb packet: "); |
1da177e4 | 539 | for (i = 0; i < nb; ++i) |
f2be6295 AS |
540 | pr_cont(" %x", buf[i]); |
541 | pr_cont(", id = %d\n", id); | |
1da177e4 LT |
542 | } |
543 | write_lock_irqsave(&adb_handler_lock, flags); | |
544 | handler = adb_handler[id].handler; | |
545 | if (handler != NULL) | |
546 | adb_handler[id].busy = 1; | |
547 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
548 | if (handler != NULL) { | |
7d12e780 | 549 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
550 | wmb(); |
551 | adb_handler[id].busy = 0; | |
552 | } | |
553 | ||
554 | } | |
555 | ||
556 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
557 | static int try_handler_change(int address, int new_id) | |
558 | { | |
559 | struct adb_request req; | |
560 | ||
561 | if (adb_handler[address].handler_id == new_id) | |
562 | return 1; | |
563 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
564 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
565 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
566 | ADB_READREG(address, 3)); | |
567 | if (req.reply_len < 2) | |
568 | return 0; | |
569 | if (req.reply[2] != new_id) | |
570 | return 0; | |
571 | adb_handler[address].handler_id = req.reply[2]; | |
572 | ||
573 | return 1; | |
574 | } | |
575 | ||
576 | int | |
577 | adb_try_handler_change(int address, int new_id) | |
578 | { | |
579 | int ret; | |
580 | ||
af3ce514 | 581 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 582 | ret = try_handler_change(address, new_id); |
af3ce514 | 583 | mutex_unlock(&adb_handler_mutex); |
2341629e FT |
584 | if (ret) |
585 | pr_debug("adb handler change: [%d] 0x%X\n", address, new_id); | |
1da177e4 LT |
586 | return ret; |
587 | } | |
370a3abd | 588 | EXPORT_SYMBOL(adb_try_handler_change); |
1da177e4 LT |
589 | |
590 | int | |
591 | adb_get_infos(int address, int *original_address, int *handler_id) | |
592 | { | |
af3ce514 | 593 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
594 | *original_address = adb_handler[address].original_address; |
595 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 596 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
597 | |
598 | return (*original_address != 0); | |
599 | } | |
600 | ||
601 | ||
602 | /* | |
603 | * /dev/adb device driver. | |
604 | */ | |
605 | ||
606 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
607 | ||
608 | struct adbdev_state { | |
609 | spinlock_t lock; | |
610 | atomic_t n_pending; | |
611 | struct adb_request *completed; | |
612 | wait_queue_head_t wait_queue; | |
613 | int inuse; | |
614 | }; | |
615 | ||
616 | static void adb_write_done(struct adb_request *req) | |
617 | { | |
618 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
619 | unsigned long flags; | |
620 | ||
621 | if (!req->complete) { | |
622 | req->reply_len = 0; | |
623 | req->complete = 1; | |
624 | } | |
625 | spin_lock_irqsave(&state->lock, flags); | |
626 | atomic_dec(&state->n_pending); | |
627 | if (!state->inuse) { | |
628 | kfree(req); | |
629 | if (atomic_read(&state->n_pending) == 0) { | |
630 | spin_unlock_irqrestore(&state->lock, flags); | |
631 | kfree(state); | |
632 | return; | |
633 | } | |
634 | } else { | |
635 | struct adb_request **ap = &state->completed; | |
636 | while (*ap != NULL) | |
637 | ap = &(*ap)->next; | |
638 | req->next = NULL; | |
639 | *ap = req; | |
640 | wake_up_interruptible(&state->wait_queue); | |
641 | } | |
642 | spin_unlock_irqrestore(&state->lock, flags); | |
643 | } | |
644 | ||
645 | static int | |
646 | do_adb_query(struct adb_request *req) | |
647 | { | |
648 | int ret = -EINVAL; | |
649 | ||
74e7cd43 | 650 | switch(req->data[1]) { |
1da177e4 | 651 | case ADB_QUERY_GETDEVINFO: |
fd97e4ad | 652 | if (req->nbytes < 3 || req->data[2] >= 16) |
1da177e4 | 653 | break; |
af3ce514 | 654 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
655 | req->reply[0] = adb_handler[req->data[2]].original_address; |
656 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 657 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
658 | req->complete = 1; |
659 | req->reply_len = 2; | |
660 | adb_write_done(req); | |
661 | ret = 0; | |
662 | break; | |
663 | } | |
664 | return ret; | |
665 | } | |
666 | ||
667 | static int adb_open(struct inode *inode, struct file *file) | |
668 | { | |
669 | struct adbdev_state *state; | |
26ce4f06 | 670 | int ret = 0; |
1da177e4 | 671 | |
d851b6e0 | 672 | mutex_lock(&adb_mutex); |
26ce4f06 JC |
673 | if (iminor(inode) > 0 || adb_controller == NULL) { |
674 | ret = -ENXIO; | |
675 | goto out; | |
676 | } | |
1da177e4 | 677 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
2f59562c | 678 | if (!state) { |
26ce4f06 JC |
679 | ret = -ENOMEM; |
680 | goto out; | |
681 | } | |
1da177e4 LT |
682 | file->private_data = state; |
683 | spin_lock_init(&state->lock); | |
684 | atomic_set(&state->n_pending, 0); | |
685 | state->completed = NULL; | |
686 | init_waitqueue_head(&state->wait_queue); | |
687 | state->inuse = 1; | |
688 | ||
26ce4f06 | 689 | out: |
d851b6e0 | 690 | mutex_unlock(&adb_mutex); |
26ce4f06 | 691 | return ret; |
1da177e4 LT |
692 | } |
693 | ||
694 | static int adb_release(struct inode *inode, struct file *file) | |
695 | { | |
696 | struct adbdev_state *state = file->private_data; | |
697 | unsigned long flags; | |
698 | ||
d851b6e0 | 699 | mutex_lock(&adb_mutex); |
1da177e4 LT |
700 | if (state) { |
701 | file->private_data = NULL; | |
702 | spin_lock_irqsave(&state->lock, flags); | |
703 | if (atomic_read(&state->n_pending) == 0 | |
704 | && state->completed == NULL) { | |
705 | spin_unlock_irqrestore(&state->lock, flags); | |
706 | kfree(state); | |
707 | } else { | |
708 | state->inuse = 0; | |
709 | spin_unlock_irqrestore(&state->lock, flags); | |
710 | } | |
711 | } | |
d851b6e0 | 712 | mutex_unlock(&adb_mutex); |
1da177e4 LT |
713 | return 0; |
714 | } | |
715 | ||
716 | static ssize_t adb_read(struct file *file, char __user *buf, | |
717 | size_t count, loff_t *ppos) | |
718 | { | |
719 | int ret = 0; | |
720 | struct adbdev_state *state = file->private_data; | |
721 | struct adb_request *req; | |
74e7cd43 | 722 | DECLARE_WAITQUEUE(wait, current); |
1da177e4 LT |
723 | unsigned long flags; |
724 | ||
725 | if (count < 2) | |
726 | return -EINVAL; | |
727 | if (count > sizeof(req->reply)) | |
728 | count = sizeof(req->reply); | |
1da177e4 LT |
729 | |
730 | req = NULL; | |
731 | spin_lock_irqsave(&state->lock, flags); | |
732 | add_wait_queue(&state->wait_queue, &wait); | |
64f8c135 | 733 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 LT |
734 | |
735 | for (;;) { | |
736 | req = state->completed; | |
737 | if (req != NULL) | |
738 | state->completed = req->next; | |
739 | else if (atomic_read(&state->n_pending) == 0) | |
740 | ret = -EIO; | |
741 | if (req != NULL || ret != 0) | |
742 | break; | |
743 | ||
744 | if (file->f_flags & O_NONBLOCK) { | |
745 | ret = -EAGAIN; | |
746 | break; | |
747 | } | |
748 | if (signal_pending(current)) { | |
749 | ret = -ERESTARTSYS; | |
750 | break; | |
751 | } | |
752 | spin_unlock_irqrestore(&state->lock, flags); | |
753 | schedule(); | |
754 | spin_lock_irqsave(&state->lock, flags); | |
755 | } | |
756 | ||
64f8c135 | 757 | set_current_state(TASK_RUNNING); |
1da177e4 LT |
758 | remove_wait_queue(&state->wait_queue, &wait); |
759 | spin_unlock_irqrestore(&state->lock, flags); | |
760 | ||
761 | if (ret) | |
762 | return ret; | |
763 | ||
764 | ret = req->reply_len; | |
765 | if (ret > count) | |
766 | ret = count; | |
767 | if (ret > 0 && copy_to_user(buf, req->reply, ret)) | |
768 | ret = -EFAULT; | |
769 | ||
770 | kfree(req); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static ssize_t adb_write(struct file *file, const char __user *buf, | |
775 | size_t count, loff_t *ppos) | |
776 | { | |
777 | int ret/*, i*/; | |
778 | struct adbdev_state *state = file->private_data; | |
779 | struct adb_request *req; | |
780 | ||
781 | if (count < 2 || count > sizeof(req->data)) | |
782 | return -EINVAL; | |
783 | if (adb_controller == NULL) | |
784 | return -ENXIO; | |
1da177e4 | 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)) { | |
f2be6295 | 889 | pr_err("adb: unable to get major %d\n", ADB_MAJOR); |
1da177e4 LT |
890 | return; |
891 | } | |
892 | ||
83bc680e | 893 | if (class_register(&adb_dev_class)) |
1da177e4 | 894 | return; |
83bc680e RM |
895 | |
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 | } |