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 | ||
56b22935 | 77 | static struct class *adb_dev_class; |
1da177e4 | 78 | |
9b4a8dd2 | 79 | static struct adb_driver *adb_controller; |
e041c683 | 80 | BLOCKING_NOTIFIER_HEAD(adb_client_list); |
1da177e4 LT |
81 | static int adb_got_sleep; |
82 | static int adb_inited; | |
8192b1f6 | 83 | static DEFINE_SEMAPHORE(adb_probe_mutex); |
1da177e4 LT |
84 | static int sleepy_trackpad; |
85 | static int autopoll_devs; | |
86 | int __adb_probe_sync; | |
87 | ||
1da177e4 LT |
88 | static int adb_scan_bus(void); |
89 | static int do_adb_reset_bus(void); | |
90 | static void adbdev_init(void); | |
91 | static int try_handler_change(int, int); | |
92 | ||
93 | static struct adb_handler { | |
7d12e780 | 94 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
95 | int original_address; |
96 | int handler_id; | |
97 | int busy; | |
98 | } adb_handler[16]; | |
99 | ||
100 | /* | |
af3ce514 | 101 | * The adb_handler_mutex mutex protects all accesses to the original_address |
1da177e4 LT |
102 | * and handler_id fields of adb_handler[i] for all i, and changes to the |
103 | * handler field. | |
104 | * Accesses to the handler field are protected by the adb_handler_lock | |
105 | * rwlock. It is held across all calls to any handler, so that by the | |
106 | * time adb_unregister returns, we know that the old handler isn't being | |
107 | * called. | |
108 | */ | |
af3ce514 | 109 | static DEFINE_MUTEX(adb_handler_mutex); |
1da177e4 LT |
110 | static DEFINE_RWLOCK(adb_handler_lock); |
111 | ||
112 | #if 0 | |
113 | static void printADBreply(struct adb_request *req) | |
114 | { | |
115 | int i; | |
116 | ||
117 | printk("adb reply (%d)", req->reply_len); | |
118 | for(i = 0; i < req->reply_len; i++) | |
119 | printk(" %x", req->reply[i]); | |
120 | printk("\n"); | |
121 | ||
122 | } | |
123 | #endif | |
124 | ||
1da177e4 LT |
125 | static int adb_scan_bus(void) |
126 | { | |
127 | int i, highFree=0, noMovement; | |
128 | int devmask = 0; | |
129 | struct adb_request req; | |
130 | ||
131 | /* assumes adb_handler[] is all zeroes at this point */ | |
132 | for (i = 1; i < 16; i++) { | |
133 | /* see if there is anything at address i */ | |
134 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
135 | (i << 4) | 0xf); | |
136 | if (req.reply_len > 1) | |
137 | /* one or more devices at this address */ | |
138 | adb_handler[i].original_address = i; | |
139 | else if (i > highFree) | |
140 | highFree = i; | |
141 | } | |
142 | ||
143 | /* Note we reset noMovement to 0 each time we move a device */ | |
144 | for (noMovement = 1; noMovement < 2 && highFree > 0; noMovement++) { | |
145 | for (i = 1; i < 16; i++) { | |
146 | if (adb_handler[i].original_address == 0) | |
147 | continue; | |
148 | /* | |
149 | * Send a "talk register 3" command to address i | |
150 | * to provoke a collision if there is more than | |
151 | * one device at this address. | |
152 | */ | |
153 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
154 | (i << 4) | 0xf); | |
155 | /* | |
156 | * Move the device(s) which didn't detect a | |
157 | * collision to address `highFree'. Hopefully | |
158 | * this only moves one device. | |
159 | */ | |
160 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
161 | (i<< 4) | 0xb, (highFree | 0x60), 0xfe); | |
162 | /* | |
163 | * See if anybody actually moved. This is suggested | |
164 | * by HW TechNote 01: | |
165 | * | |
a7beab41 | 166 | * https://developer.apple.com/technotes/hw/hw_01.html |
1da177e4 LT |
167 | */ |
168 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
169 | (highFree << 4) | 0xf); | |
170 | if (req.reply_len <= 1) continue; | |
171 | /* | |
172 | * Test whether there are any device(s) left | |
173 | * at address i. | |
174 | */ | |
175 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
176 | (i << 4) | 0xf); | |
177 | if (req.reply_len > 1) { | |
178 | /* | |
179 | * There are still one or more devices | |
180 | * left at address i. Register the one(s) | |
181 | * we moved to `highFree', and find a new | |
182 | * value for highFree. | |
183 | */ | |
184 | adb_handler[highFree].original_address = | |
185 | adb_handler[i].original_address; | |
186 | while (highFree > 0 && | |
187 | adb_handler[highFree].original_address) | |
188 | highFree--; | |
189 | if (highFree <= 0) | |
190 | break; | |
191 | ||
192 | noMovement = 0; | |
74e7cd43 | 193 | } else { |
1da177e4 LT |
194 | /* |
195 | * No devices left at address i; move the | |
196 | * one(s) we moved to `highFree' back to i. | |
197 | */ | |
198 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
199 | (highFree << 4) | 0xb, | |
200 | (i | 0x60), 0xfe); | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
205 | /* Now fill in the handler_id field of the adb_handler entries. */ | |
1da177e4 LT |
206 | for (i = 1; i < 16; i++) { |
207 | if (adb_handler[i].original_address == 0) | |
208 | continue; | |
209 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
210 | (i << 4) | 0xf); | |
211 | adb_handler[i].handler_id = req.reply[2]; | |
2341629e FT |
212 | printk(KERN_DEBUG "adb device [%d]: %d 0x%X\n", i, |
213 | adb_handler[i].original_address, | |
214 | adb_handler[i].handler_id); | |
1da177e4 LT |
215 | devmask |= 1 << i; |
216 | } | |
1da177e4 LT |
217 | return devmask; |
218 | } | |
219 | ||
220 | /* | |
221 | * This kernel task handles ADB probing. It dies once probing is | |
222 | * completed. | |
223 | */ | |
224 | static int | |
225 | adb_probe_task(void *x) | |
226 | { | |
f2be6295 | 227 | pr_debug("adb: starting probe task...\n"); |
1da177e4 | 228 | do_adb_reset_bus(); |
f2be6295 | 229 | pr_debug("adb: finished probe task...\n"); |
1b6dd9ba | 230 | |
1da177e4 | 231 | up(&adb_probe_mutex); |
1b6dd9ba | 232 | |
1da177e4 LT |
233 | return 0; |
234 | } | |
235 | ||
236 | static void | |
3e577a80 | 237 | __adb_probe_task(struct work_struct *bullshit) |
1da177e4 | 238 | { |
c61dace9 | 239 | kthread_run(adb_probe_task, NULL, "kadbprobe"); |
1da177e4 LT |
240 | } |
241 | ||
3e577a80 | 242 | static DECLARE_WORK(adb_reset_work, __adb_probe_task); |
1da177e4 LT |
243 | |
244 | int | |
245 | adb_reset_bus(void) | |
246 | { | |
247 | if (__adb_probe_sync) { | |
248 | do_adb_reset_bus(); | |
249 | return 0; | |
250 | } | |
251 | ||
252 | down(&adb_probe_mutex); | |
253 | schedule_work(&adb_reset_work); | |
254 | return 0; | |
255 | } | |
256 | ||
c9f6d3d5 JB |
257 | #ifdef CONFIG_PM |
258 | /* | |
259 | * notify clients before sleep | |
260 | */ | |
639291f2 | 261 | static int __adb_suspend(struct platform_device *dev, pm_message_t state) |
c9f6d3d5 JB |
262 | { |
263 | adb_got_sleep = 1; | |
264 | /* We need to get a lock on the probe thread */ | |
265 | down(&adb_probe_mutex); | |
266 | /* Stop autopoll */ | |
267 | if (adb_controller->autopoll) | |
268 | adb_controller->autopoll(0); | |
269 | blocking_notifier_call_chain(&adb_client_list, ADB_MSG_POWERDOWN, NULL); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
639291f2 SK |
274 | static int adb_suspend(struct device *dev) |
275 | { | |
276 | return __adb_suspend(to_platform_device(dev), PMSG_SUSPEND); | |
277 | } | |
278 | ||
279 | static int adb_freeze(struct device *dev) | |
280 | { | |
281 | return __adb_suspend(to_platform_device(dev), PMSG_FREEZE); | |
282 | } | |
283 | ||
284 | static int adb_poweroff(struct device *dev) | |
285 | { | |
286 | return __adb_suspend(to_platform_device(dev), PMSG_HIBERNATE); | |
287 | } | |
288 | ||
c9f6d3d5 JB |
289 | /* |
290 | * reset bus after sleep | |
291 | */ | |
639291f2 | 292 | static int __adb_resume(struct platform_device *dev) |
c9f6d3d5 JB |
293 | { |
294 | adb_got_sleep = 0; | |
295 | up(&adb_probe_mutex); | |
296 | adb_reset_bus(); | |
297 | ||
298 | return 0; | |
299 | } | |
639291f2 SK |
300 | |
301 | static int adb_resume(struct device *dev) | |
302 | { | |
303 | return __adb_resume(to_platform_device(dev)); | |
304 | } | |
c9f6d3d5 JB |
305 | #endif /* CONFIG_PM */ |
306 | ||
9b4a8dd2 | 307 | static int __init adb_init(void) |
1da177e4 LT |
308 | { |
309 | struct adb_driver *driver; | |
310 | int i; | |
311 | ||
312 | #ifdef CONFIG_PPC32 | |
e8222502 | 313 | if (!machine_is(chrp) && !machine_is(powermac)) |
1da177e4 LT |
314 | return 0; |
315 | #endif | |
316 | #ifdef CONFIG_MAC | |
317 | if (!MACH_IS_MAC) | |
318 | return 0; | |
319 | #endif | |
320 | ||
321 | /* xmon may do early-init */ | |
322 | if (adb_inited) | |
323 | return 0; | |
324 | adb_inited = 1; | |
325 | ||
326 | adb_controller = NULL; | |
327 | ||
328 | i = 0; | |
329 | while ((driver = adb_driver_list[i++]) != NULL) { | |
330 | if (!driver->probe()) { | |
331 | adb_controller = driver; | |
332 | break; | |
333 | } | |
334 | } | |
18814ee8 FT |
335 | if (adb_controller != NULL && adb_controller->init && |
336 | adb_controller->init()) | |
1da177e4 | 337 | adb_controller = NULL; |
18814ee8 | 338 | if (adb_controller == NULL) { |
f2be6295 | 339 | pr_warn("Warning: no ADB interface detected\n"); |
1da177e4 | 340 | } else { |
1da177e4 | 341 | #ifdef CONFIG_PPC |
71a157e8 GL |
342 | if (of_machine_is_compatible("AAPL,PowerBook1998") || |
343 | of_machine_is_compatible("PowerBook1,1")) | |
1da177e4 LT |
344 | sleepy_trackpad = 1; |
345 | #endif /* CONFIG_PPC */ | |
c9f6d3d5 | 346 | |
1da177e4 LT |
347 | adbdev_init(); |
348 | adb_reset_bus(); | |
349 | } | |
350 | return 0; | |
351 | } | |
352 | ||
faa5b9da | 353 | device_initcall(adb_init); |
1da177e4 | 354 | |
1da177e4 LT |
355 | static int |
356 | do_adb_reset_bus(void) | |
357 | { | |
70b52b38 | 358 | int ret; |
1da177e4 LT |
359 | |
360 | if (adb_controller == NULL) | |
361 | return -ENXIO; | |
362 | ||
363 | if (adb_controller->autopoll) | |
364 | adb_controller->autopoll(0); | |
365 | ||
70b52b38 JB |
366 | blocking_notifier_call_chain(&adb_client_list, |
367 | ADB_MSG_PRE_RESET, NULL); | |
1da177e4 LT |
368 | |
369 | if (sleepy_trackpad) { | |
370 | /* Let the trackpad settle down */ | |
c61dace9 | 371 | msleep(500); |
1da177e4 LT |
372 | } |
373 | ||
af3ce514 | 374 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
375 | write_lock_irq(&adb_handler_lock); |
376 | memset(adb_handler, 0, sizeof(adb_handler)); | |
377 | write_unlock_irq(&adb_handler_lock); | |
378 | ||
379 | /* That one is still a bit synchronous, oh well... */ | |
380 | if (adb_controller->reset_bus) | |
381 | ret = adb_controller->reset_bus(); | |
382 | else | |
383 | ret = 0; | |
384 | ||
385 | if (sleepy_trackpad) { | |
386 | /* Let the trackpad settle down */ | |
c61dace9 | 387 | msleep(1500); |
1da177e4 LT |
388 | } |
389 | ||
390 | if (!ret) { | |
391 | autopoll_devs = adb_scan_bus(); | |
392 | if (adb_controller->autopoll) | |
393 | adb_controller->autopoll(autopoll_devs); | |
394 | } | |
af3ce514 | 395 | mutex_unlock(&adb_handler_mutex); |
1da177e4 | 396 | |
70b52b38 JB |
397 | blocking_notifier_call_chain(&adb_client_list, |
398 | ADB_MSG_POST_RESET, NULL); | |
1da177e4 LT |
399 | |
400 | return ret; | |
401 | } | |
402 | ||
403 | void | |
404 | adb_poll(void) | |
405 | { | |
406 | if ((adb_controller == NULL)||(adb_controller->poll == NULL)) | |
407 | return; | |
408 | adb_controller->poll(); | |
409 | } | |
370a3abd | 410 | EXPORT_SYMBOL(adb_poll); |
1da177e4 | 411 | |
c61dace9 | 412 | static void adb_sync_req_done(struct adb_request *req) |
1da177e4 | 413 | { |
c61dace9 | 414 | struct completion *comp = req->arg; |
1da177e4 | 415 | |
c61dace9 PM |
416 | complete(comp); |
417 | } | |
1da177e4 LT |
418 | |
419 | int | |
420 | adb_request(struct adb_request *req, void (*done)(struct adb_request *), | |
421 | int flags, int nbytes, ...) | |
422 | { | |
423 | va_list list; | |
c61dace9 | 424 | int i; |
1da177e4 | 425 | int rc; |
c61dace9 | 426 | struct completion comp; |
1da177e4 LT |
427 | |
428 | if ((adb_controller == NULL) || (adb_controller->send_request == NULL)) | |
429 | return -ENXIO; | |
430 | if (nbytes < 1) | |
431 | return -EINVAL; | |
c61dace9 | 432 | |
1da177e4 LT |
433 | req->nbytes = nbytes+1; |
434 | req->done = done; | |
435 | req->reply_expected = flags & ADBREQ_REPLY; | |
436 | req->data[0] = ADB_PACKET; | |
437 | va_start(list, nbytes); | |
438 | for (i = 0; i < nbytes; ++i) | |
439 | req->data[i+1] = va_arg(list, int); | |
440 | va_end(list); | |
441 | ||
442 | if (flags & ADBREQ_NOSEND) | |
443 | return 0; | |
444 | ||
c61dace9 PM |
445 | /* Synchronous requests block using an on-stack completion */ |
446 | if (flags & ADBREQ_SYNC) { | |
447 | WARN_ON(done); | |
448 | req->done = adb_sync_req_done; | |
449 | req->arg = ∁ | |
450 | init_completion(&comp); | |
1da177e4 LT |
451 | } |
452 | ||
c61dace9 PM |
453 | rc = adb_controller->send_request(req, 0); |
454 | ||
455 | if ((flags & ADBREQ_SYNC) && !rc && !req->complete) | |
456 | wait_for_completion(&comp); | |
1da177e4 LT |
457 | |
458 | return rc; | |
459 | } | |
370a3abd | 460 | EXPORT_SYMBOL(adb_request); |
1da177e4 LT |
461 | |
462 | /* Ultimately this should return the number of devices with | |
463 | the given default id. | |
464 | And it does it now ! Note: changed behaviour: This function | |
465 | will now register if default_id _and_ handler_id both match | |
466 | but handler_id can be left to 0 to match with default_id only. | |
467 | When handler_id is set, this function will try to adjust | |
468 | the handler_id id it doesn't match. */ | |
469 | int | |
470 | adb_register(int default_id, int handler_id, struct adb_ids *ids, | |
7d12e780 | 471 | void (*handler)(unsigned char *, int, int)) |
1da177e4 LT |
472 | { |
473 | int i; | |
474 | ||
af3ce514 | 475 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
476 | ids->nids = 0; |
477 | for (i = 1; i < 16; i++) { | |
478 | if ((adb_handler[i].original_address == default_id) && | |
479 | (!handler_id || (handler_id == adb_handler[i].handler_id) || | |
480 | try_handler_change(i, handler_id))) { | |
2f59562c | 481 | if (adb_handler[i].handler) { |
f2be6295 | 482 | pr_err("Two handlers for ADB device %d\n", |
1da177e4 LT |
483 | default_id); |
484 | continue; | |
485 | } | |
486 | write_lock_irq(&adb_handler_lock); | |
487 | adb_handler[i].handler = handler; | |
488 | write_unlock_irq(&adb_handler_lock); | |
489 | ids->id[ids->nids++] = i; | |
490 | } | |
491 | } | |
af3ce514 | 492 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
493 | return ids->nids; |
494 | } | |
370a3abd | 495 | EXPORT_SYMBOL(adb_register); |
1da177e4 LT |
496 | |
497 | int | |
498 | adb_unregister(int index) | |
499 | { | |
500 | int ret = -ENODEV; | |
501 | ||
af3ce514 | 502 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
503 | write_lock_irq(&adb_handler_lock); |
504 | if (adb_handler[index].handler) { | |
505 | while(adb_handler[index].busy) { | |
506 | write_unlock_irq(&adb_handler_lock); | |
507 | yield(); | |
508 | write_lock_irq(&adb_handler_lock); | |
509 | } | |
510 | ret = 0; | |
511 | adb_handler[index].handler = NULL; | |
512 | } | |
513 | write_unlock_irq(&adb_handler_lock); | |
af3ce514 | 514 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
515 | return ret; |
516 | } | |
370a3abd | 517 | EXPORT_SYMBOL(adb_unregister); |
1da177e4 LT |
518 | |
519 | void | |
7d12e780 | 520 | adb_input(unsigned char *buf, int nb, int autopoll) |
1da177e4 LT |
521 | { |
522 | int i, id; | |
74e7cd43 | 523 | static int dump_adb_input; |
1da177e4 LT |
524 | unsigned long flags; |
525 | ||
7d12e780 | 526 | void (*handler)(unsigned char *, int, int); |
1da177e4 LT |
527 | |
528 | /* We skip keystrokes and mouse moves when the sleep process | |
529 | * has been started. We stop autopoll, but this is another security | |
530 | */ | |
531 | if (adb_got_sleep) | |
532 | return; | |
533 | ||
534 | id = buf[0] >> 4; | |
535 | if (dump_adb_input) { | |
f2be6295 | 536 | pr_info("adb packet: "); |
1da177e4 | 537 | for (i = 0; i < nb; ++i) |
f2be6295 AS |
538 | pr_cont(" %x", buf[i]); |
539 | pr_cont(", id = %d\n", id); | |
1da177e4 LT |
540 | } |
541 | write_lock_irqsave(&adb_handler_lock, flags); | |
542 | handler = adb_handler[id].handler; | |
543 | if (handler != NULL) | |
544 | adb_handler[id].busy = 1; | |
545 | write_unlock_irqrestore(&adb_handler_lock, flags); | |
546 | if (handler != NULL) { | |
7d12e780 | 547 | (*handler)(buf, nb, autopoll); |
1da177e4 LT |
548 | wmb(); |
549 | adb_handler[id].busy = 0; | |
550 | } | |
551 | ||
552 | } | |
553 | ||
554 | /* Try to change handler to new_id. Will return 1 if successful. */ | |
555 | static int try_handler_change(int address, int new_id) | |
556 | { | |
557 | struct adb_request req; | |
558 | ||
559 | if (adb_handler[address].handler_id == new_id) | |
560 | return 1; | |
561 | adb_request(&req, NULL, ADBREQ_SYNC, 3, | |
562 | ADB_WRITEREG(address, 3), address | 0x20, new_id); | |
563 | adb_request(&req, NULL, ADBREQ_SYNC | ADBREQ_REPLY, 1, | |
564 | ADB_READREG(address, 3)); | |
565 | if (req.reply_len < 2) | |
566 | return 0; | |
567 | if (req.reply[2] != new_id) | |
568 | return 0; | |
569 | adb_handler[address].handler_id = req.reply[2]; | |
570 | ||
571 | return 1; | |
572 | } | |
573 | ||
574 | int | |
575 | adb_try_handler_change(int address, int new_id) | |
576 | { | |
577 | int ret; | |
578 | ||
af3ce514 | 579 | mutex_lock(&adb_handler_mutex); |
1da177e4 | 580 | ret = try_handler_change(address, new_id); |
af3ce514 | 581 | mutex_unlock(&adb_handler_mutex); |
2341629e FT |
582 | if (ret) |
583 | pr_debug("adb handler change: [%d] 0x%X\n", address, new_id); | |
1da177e4 LT |
584 | return ret; |
585 | } | |
370a3abd | 586 | EXPORT_SYMBOL(adb_try_handler_change); |
1da177e4 LT |
587 | |
588 | int | |
589 | adb_get_infos(int address, int *original_address, int *handler_id) | |
590 | { | |
af3ce514 | 591 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
592 | *original_address = adb_handler[address].original_address; |
593 | *handler_id = adb_handler[address].handler_id; | |
af3ce514 | 594 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
595 | |
596 | return (*original_address != 0); | |
597 | } | |
598 | ||
599 | ||
600 | /* | |
601 | * /dev/adb device driver. | |
602 | */ | |
603 | ||
604 | #define ADB_MAJOR 56 /* major number for /dev/adb */ | |
605 | ||
606 | struct adbdev_state { | |
607 | spinlock_t lock; | |
608 | atomic_t n_pending; | |
609 | struct adb_request *completed; | |
610 | wait_queue_head_t wait_queue; | |
611 | int inuse; | |
612 | }; | |
613 | ||
614 | static void adb_write_done(struct adb_request *req) | |
615 | { | |
616 | struct adbdev_state *state = (struct adbdev_state *) req->arg; | |
617 | unsigned long flags; | |
618 | ||
619 | if (!req->complete) { | |
620 | req->reply_len = 0; | |
621 | req->complete = 1; | |
622 | } | |
623 | spin_lock_irqsave(&state->lock, flags); | |
624 | atomic_dec(&state->n_pending); | |
625 | if (!state->inuse) { | |
626 | kfree(req); | |
627 | if (atomic_read(&state->n_pending) == 0) { | |
628 | spin_unlock_irqrestore(&state->lock, flags); | |
629 | kfree(state); | |
630 | return; | |
631 | } | |
632 | } else { | |
633 | struct adb_request **ap = &state->completed; | |
634 | while (*ap != NULL) | |
635 | ap = &(*ap)->next; | |
636 | req->next = NULL; | |
637 | *ap = req; | |
638 | wake_up_interruptible(&state->wait_queue); | |
639 | } | |
640 | spin_unlock_irqrestore(&state->lock, flags); | |
641 | } | |
642 | ||
643 | static int | |
644 | do_adb_query(struct adb_request *req) | |
645 | { | |
646 | int ret = -EINVAL; | |
647 | ||
74e7cd43 | 648 | switch(req->data[1]) { |
1da177e4 | 649 | case ADB_QUERY_GETDEVINFO: |
fd97e4ad | 650 | if (req->nbytes < 3 || req->data[2] >= 16) |
1da177e4 | 651 | break; |
af3ce514 | 652 | mutex_lock(&adb_handler_mutex); |
1da177e4 LT |
653 | req->reply[0] = adb_handler[req->data[2]].original_address; |
654 | req->reply[1] = adb_handler[req->data[2]].handler_id; | |
af3ce514 | 655 | mutex_unlock(&adb_handler_mutex); |
1da177e4 LT |
656 | req->complete = 1; |
657 | req->reply_len = 2; | |
658 | adb_write_done(req); | |
659 | ret = 0; | |
660 | break; | |
661 | } | |
662 | return ret; | |
663 | } | |
664 | ||
665 | static int adb_open(struct inode *inode, struct file *file) | |
666 | { | |
667 | struct adbdev_state *state; | |
26ce4f06 | 668 | int ret = 0; |
1da177e4 | 669 | |
d851b6e0 | 670 | mutex_lock(&adb_mutex); |
26ce4f06 JC |
671 | if (iminor(inode) > 0 || adb_controller == NULL) { |
672 | ret = -ENXIO; | |
673 | goto out; | |
674 | } | |
1da177e4 | 675 | state = kmalloc(sizeof(struct adbdev_state), GFP_KERNEL); |
2f59562c | 676 | if (!state) { |
26ce4f06 JC |
677 | ret = -ENOMEM; |
678 | goto out; | |
679 | } | |
1da177e4 LT |
680 | file->private_data = state; |
681 | spin_lock_init(&state->lock); | |
682 | atomic_set(&state->n_pending, 0); | |
683 | state->completed = NULL; | |
684 | init_waitqueue_head(&state->wait_queue); | |
685 | state->inuse = 1; | |
686 | ||
26ce4f06 | 687 | out: |
d851b6e0 | 688 | mutex_unlock(&adb_mutex); |
26ce4f06 | 689 | return ret; |
1da177e4 LT |
690 | } |
691 | ||
692 | static int adb_release(struct inode *inode, struct file *file) | |
693 | { | |
694 | struct adbdev_state *state = file->private_data; | |
695 | unsigned long flags; | |
696 | ||
d851b6e0 | 697 | mutex_lock(&adb_mutex); |
1da177e4 LT |
698 | if (state) { |
699 | file->private_data = NULL; | |
700 | spin_lock_irqsave(&state->lock, flags); | |
701 | if (atomic_read(&state->n_pending) == 0 | |
702 | && state->completed == NULL) { | |
703 | spin_unlock_irqrestore(&state->lock, flags); | |
704 | kfree(state); | |
705 | } else { | |
706 | state->inuse = 0; | |
707 | spin_unlock_irqrestore(&state->lock, flags); | |
708 | } | |
709 | } | |
d851b6e0 | 710 | mutex_unlock(&adb_mutex); |
1da177e4 LT |
711 | return 0; |
712 | } | |
713 | ||
714 | static ssize_t adb_read(struct file *file, char __user *buf, | |
715 | size_t count, loff_t *ppos) | |
716 | { | |
717 | int ret = 0; | |
718 | struct adbdev_state *state = file->private_data; | |
719 | struct adb_request *req; | |
74e7cd43 | 720 | DECLARE_WAITQUEUE(wait, current); |
1da177e4 LT |
721 | unsigned long flags; |
722 | ||
723 | if (count < 2) | |
724 | return -EINVAL; | |
725 | if (count > sizeof(req->reply)) | |
726 | count = sizeof(req->reply); | |
1da177e4 LT |
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; | |
1da177e4 | 783 | |
5cbded58 | 784 | req = kmalloc(sizeof(struct adb_request), |
1da177e4 LT |
785 | GFP_KERNEL); |
786 | if (req == NULL) | |
787 | return -ENOMEM; | |
788 | ||
789 | req->nbytes = count; | |
790 | req->done = adb_write_done; | |
791 | req->arg = (void *) state; | |
792 | req->complete = 0; | |
793 | ||
794 | ret = -EFAULT; | |
795 | if (copy_from_user(req->data, buf, count)) | |
796 | goto out; | |
797 | ||
798 | atomic_inc(&state->n_pending); | |
799 | ||
800 | /* If a probe is in progress or we are sleeping, wait for it to complete */ | |
801 | down(&adb_probe_mutex); | |
802 | ||
803 | /* Queries are special requests sent to the ADB driver itself */ | |
804 | if (req->data[0] == ADB_QUERY) { | |
805 | if (count > 1) | |
806 | ret = do_adb_query(req); | |
807 | else | |
808 | ret = -EINVAL; | |
809 | up(&adb_probe_mutex); | |
810 | } | |
811 | /* Special case for ADB_BUSRESET request, all others are sent to | |
812 | the controller */ | |
74e7cd43 BS |
813 | else if ((req->data[0] == ADB_PACKET) && (count > 1) |
814 | && (req->data[1] == ADB_BUSRESET)) { | |
1da177e4 LT |
815 | ret = do_adb_reset_bus(); |
816 | up(&adb_probe_mutex); | |
817 | atomic_dec(&state->n_pending); | |
818 | if (ret == 0) | |
819 | ret = count; | |
820 | goto out; | |
821 | } else { | |
822 | req->reply_expected = ((req->data[1] & 0xc) == 0xc); | |
823 | if (adb_controller && adb_controller->send_request) | |
824 | ret = adb_controller->send_request(req, 0); | |
825 | else | |
826 | ret = -ENXIO; | |
827 | up(&adb_probe_mutex); | |
828 | } | |
829 | ||
830 | if (ret != 0) { | |
831 | atomic_dec(&state->n_pending); | |
832 | goto out; | |
833 | } | |
834 | return count; | |
835 | ||
836 | out: | |
837 | kfree(req); | |
838 | return ret; | |
839 | } | |
840 | ||
fa027c2a | 841 | static const struct file_operations adb_fops = { |
1da177e4 LT |
842 | .owner = THIS_MODULE, |
843 | .llseek = no_llseek, | |
844 | .read = adb_read, | |
845 | .write = adb_write, | |
846 | .open = adb_open, | |
847 | .release = adb_release, | |
848 | }; | |
849 | ||
639291f2 SK |
850 | #ifdef CONFIG_PM |
851 | static const struct dev_pm_ops adb_dev_pm_ops = { | |
852 | .suspend = adb_suspend, | |
853 | .resume = adb_resume, | |
854 | /* Hibernate hooks */ | |
855 | .freeze = adb_freeze, | |
856 | .thaw = adb_resume, | |
857 | .poweroff = adb_poweroff, | |
858 | .restore = adb_resume, | |
859 | }; | |
860 | #endif | |
861 | ||
c9f6d3d5 JB |
862 | static struct platform_driver adb_pfdrv = { |
863 | .driver = { | |
864 | .name = "adb", | |
c9f6d3d5 | 865 | #ifdef CONFIG_PM |
639291f2 | 866 | .pm = &adb_dev_pm_ops, |
c9f6d3d5 | 867 | #endif |
639291f2 | 868 | }, |
c9f6d3d5 JB |
869 | }; |
870 | ||
871 | static struct platform_device adb_pfdev = { | |
872 | .name = "adb", | |
873 | }; | |
874 | ||
875 | static int __init | |
876 | adb_dummy_probe(struct platform_device *dev) | |
877 | { | |
878 | if (dev == &adb_pfdev) | |
879 | return 0; | |
880 | return -ENODEV; | |
881 | } | |
882 | ||
883 | static void __init | |
1da177e4 LT |
884 | adbdev_init(void) |
885 | { | |
886 | if (register_chrdev(ADB_MAJOR, "adb", &adb_fops)) { | |
f2be6295 | 887 | pr_err("adb: unable to get major %d\n", ADB_MAJOR); |
1da177e4 LT |
888 | return; |
889 | } | |
890 | ||
1aaba11d | 891 | adb_dev_class = class_create("adb"); |
56b22935 | 892 | if (IS_ERR(adb_dev_class)) |
1da177e4 | 893 | return; |
a9b12619 | 894 | device_create(adb_dev_class, NULL, MKDEV(ADB_MAJOR, 0), NULL, "adb"); |
c9f6d3d5 JB |
895 | |
896 | platform_device_register(&adb_pfdev); | |
897 | platform_driver_probe(&adb_pfdrv, adb_dummy_probe); | |
1da177e4 | 898 | } |