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Initial commit
[wrt350n-kernel.git] / drivers / sh / maple / maple.c
blob9cfcfd8dad5e5fb5dfd36bd651a70efc99c43c31
1 /*
2 * Core maple bus functionality
3 *
4 * Copyright (C) 2007 Adrian McMenamin
5 *
6 * Based on 2.4 code by:
7 *
8 * Copyright (C) 2000-2001 YAEGASHI Takeshi
9 * Copyright (C) 2001 M. R. Brown
10 * Copyright (C) 2001 Paul Mundt
11 *
12 * and others.
13 *
14 * This file is subject to the terms and conditions of the GNU General Public
15 * License. See the file "COPYING" in the main directory of this archive
16 * for more details.
17 */
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/device.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/list.h>
24 #include <linux/io.h>
25 #include <linux/slab.h>
26 #include <linux/maple.h>
27 #include <linux/dma-mapping.h>
28 #include <asm/cacheflush.h>
29 #include <asm/dma.h>
30 #include <asm/io.h>
31 #include <asm/mach/dma.h>
32 #include <asm/mach/sysasic.h>
33 #include <asm/mach/maple.h>
34 #include <linux/delay.h>
35
36 MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin");
37 MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
38 MODULE_LICENSE("GPL v2");
39 MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}");
40
41 static void maple_dma_handler(struct work_struct *work);
42 static void maple_vblank_handler(struct work_struct *work);
43
44 static DECLARE_WORK(maple_dma_process, maple_dma_handler);
45 static DECLARE_WORK(maple_vblank_process, maple_vblank_handler);
46
47 static LIST_HEAD(maple_waitq);
48 static LIST_HEAD(maple_sentq);
49
50 static DEFINE_MUTEX(maple_list_lock);
51
52 static struct maple_driver maple_dummy_driver;
53 static struct device maple_bus;
54 static int subdevice_map[MAPLE_PORTS];
55 static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
56 static unsigned long maple_pnp_time;
57 static int started, scanning, liststatus, realscan;
58 static struct kmem_cache *maple_queue_cache;
59
60 struct maple_device_specify {
61 int port;
62 int unit;
63 };
64
65 /**
66 * maple_driver_register - register a device driver
67 * automatically makes the driver bus a maple bus
68 * @drv: the driver to be registered
69 */
70 int maple_driver_register(struct device_driver *drv)
71 {
72 if (!drv)
73 return -EINVAL;
74 drv->bus = &maple_bus_type;
75 return driver_register(drv);
76 }
77 EXPORT_SYMBOL_GPL(maple_driver_register);
78
79 /* set hardware registers to enable next round of dma */
80 static void maplebus_dma_reset(void)
81 {
82 ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
83 /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
84 ctrl_outl(1, MAPLE_TRIGTYPE);
85 ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
86 ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
87 ctrl_outl(1, MAPLE_ENABLE);
88 }
89
90 /**
91 * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
92 * @dev: device responding
93 * @callback: handler callback
94 * @interval: interval in jiffies between callbacks
95 * @function: the function code for the device
96 */
97 void maple_getcond_callback(struct maple_device *dev,
98 void (*callback) (struct mapleq *mq),
99 unsigned long interval, unsigned long function)
100 {
101 dev->callback = callback;
102 dev->interval = interval;
103 dev->function = cpu_to_be32(function);
104 dev->when = jiffies;
105 }
106 EXPORT_SYMBOL_GPL(maple_getcond_callback);
107
108 static int maple_dma_done(void)
109 {
110 return (ctrl_inl(MAPLE_STATE) & 1) == 0;
111 }
112
113 static void maple_release_device(struct device *dev)
114 {
115 struct maple_device *mdev;
116 struct mapleq *mq;
117 if (!dev)
118 return;
119 mdev = to_maple_dev(dev);
120 mq = mdev->mq;
121 if (mq) {
122 if (mq->recvbufdcsp)
123 kmem_cache_free(maple_queue_cache, mq->recvbufdcsp);
124 kfree(mq);
125 mq = NULL;
126 }
127 kfree(mdev);
128 }
129
130 /**
131 * maple_add_packet - add a single instruction to the queue
132 * @mq: instruction to add to waiting queue
133 */
134 void maple_add_packet(struct mapleq *mq)
135 {
136 mutex_lock(&maple_list_lock);
137 list_add(&mq->list, &maple_waitq);
138 mutex_unlock(&maple_list_lock);
139 }
140 EXPORT_SYMBOL_GPL(maple_add_packet);
141
142 static struct mapleq *maple_allocq(struct maple_device *mdev)
143 {
144 struct mapleq *mq;
145
146 mq = kmalloc(sizeof(*mq), GFP_KERNEL);
147 if (!mq)
148 return NULL;
149
150 mq->dev = mdev;
151 mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
152 mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
153 if (!mq->recvbuf) {
154 kfree(mq);
155 return NULL;
156 }
157
158 return mq;
159 }
160
161 static struct maple_device *maple_alloc_dev(int port, int unit)
162 {
163 struct maple_device *mdev;
164
165 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
166 if (!mdev)
167 return NULL;
168
169 mdev->port = port;
170 mdev->unit = unit;
171 mdev->mq = maple_allocq(mdev);
172
173 if (!mdev->mq) {
174 kfree(mdev);
175 return NULL;
176 }
177 mdev->dev.bus = &maple_bus_type;
178 mdev->dev.parent = &maple_bus;
179 mdev->function = 0;
180 return mdev;
181 }
182
183 static void maple_free_dev(struct maple_device *mdev)
184 {
185 if (!mdev)
186 return;
187 if (mdev->mq) {
188 if (mdev->mq->recvbufdcsp)
189 kmem_cache_free(maple_queue_cache,
190 mdev->mq->recvbufdcsp);
191 kfree(mdev->mq);
192 }
193 kfree(mdev);
194 }
195
196 /* process the command queue into a maple command block
197 * terminating command has bit 32 of first long set to 0
198 */
199 static void maple_build_block(struct mapleq *mq)
200 {
201 int port, unit, from, to, len;
202 unsigned long *lsendbuf = mq->sendbuf;
203
204 port = mq->dev->port & 3;
205 unit = mq->dev->unit;
206 len = mq->length;
207 from = port << 6;
208 to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
209
210 *maple_lastptr &= 0x7fffffff;
211 maple_lastptr = maple_sendptr;
212
213 *maple_sendptr++ = (port << 16) | len | 0x80000000;
214 *maple_sendptr++ = PHYSADDR(mq->recvbuf);
215 *maple_sendptr++ =
216 mq->command | (to << 8) | (from << 16) | (len << 24);
217
218 while (len-- > 0)
219 *maple_sendptr++ = *lsendbuf++;
220 }
221
222 /* build up command queue */
223 static void maple_send(void)
224 {
225 int i;
226 int maple_packets;
227 struct mapleq *mq, *nmq;
228
229 if (!list_empty(&maple_sentq))
230 return;
231 if (list_empty(&maple_waitq) || !maple_dma_done())
232 return;
233 maple_packets = 0;
234 maple_sendptr = maple_lastptr = maple_sendbuf;
235 list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
236 maple_build_block(mq);
237 list_move(&mq->list, &maple_sentq);
238 if (maple_packets++ > MAPLE_MAXPACKETS)
239 break;
240 }
241 if (maple_packets > 0) {
242 for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
243 dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
244 PAGE_SIZE, DMA_BIDIRECTIONAL);
245 }
246 }
247
248 static int attach_matching_maple_driver(struct device_driver *driver,
249 void *devptr)
250 {
251 struct maple_driver *maple_drv;
252 struct maple_device *mdev;
253
254 mdev = devptr;
255 maple_drv = to_maple_driver(driver);
256 if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) {
257 if (maple_drv->connect(mdev) == 0) {
258 mdev->driver = maple_drv;
259 return 1;
260 }
261 }
262 return 0;
263 }
264
265 static void maple_detach_driver(struct maple_device *mdev)
266 {
267 if (!mdev)
268 return;
269 if (mdev->driver) {
270 if (mdev->driver->disconnect)
271 mdev->driver->disconnect(mdev);
272 }
273 mdev->driver = NULL;
274 device_unregister(&mdev->dev);
275 mdev = NULL;
276 }
277
278 /* process initial MAPLE_COMMAND_DEVINFO for each device or port */
279 static void maple_attach_driver(struct maple_device *mdev)
280 {
281 char *p, *recvbuf;
282 unsigned long function;
283 int matched, retval;
284
285 recvbuf = mdev->mq->recvbuf;
286 /* copy the data as individual elements in
287 * case of memory optimisation */
288 memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
289 memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
290 memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
291 memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
292 memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
293 memcpy(&mdev->devinfo.product_licence[0], recvbuf + 52, 60);
294 memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
295 memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
296 memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
297 mdev->product_name[30] = '\0';
298 memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
299 mdev->product_licence[60] = '\0';
300
301 for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
302 if (*p == ' ')
303 *p = '\0';
304 else
305 break;
306 for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
307 if (*p == ' ')
308 *p = '\0';
309 else
310 break;
311
312 if (realscan) {
313 printk(KERN_INFO "Maple device detected: %s\n",
314 mdev->product_name);
315 printk(KERN_INFO "Maple device: %s\n", mdev->product_licence);
316 }
317
318 function = be32_to_cpu(mdev->devinfo.function);
319
320 if (function > 0x200) {
321 /* Do this silently - as not a real device */
322 function = 0;
323 mdev->driver = &maple_dummy_driver;
324 sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port);
325 } else {
326 if (realscan)
327 printk(KERN_INFO
328 "Maple bus at (%d, %d): Function 0x%lX\n",
329 mdev->port, mdev->unit, function);
330
331 matched =
332 bus_for_each_drv(&maple_bus_type, NULL, mdev,
333 attach_matching_maple_driver);
334
335 if (matched == 0) {
336 /* Driver does not exist yet */
337 if (realscan)
338 printk(KERN_INFO
339 "No maple driver found.\n");
340 mdev->driver = &maple_dummy_driver;
341 }
342 sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port,
343 mdev->unit, function);
344 }
345 mdev->function = function;
346 mdev->dev.release = &maple_release_device;
347 retval = device_register(&mdev->dev);
348 if (retval) {
349 printk(KERN_INFO
350 "Maple bus: Attempt to register device"
351 " (%x, %x) failed.\n",
352 mdev->port, mdev->unit);
353 maple_free_dev(mdev);
354 mdev = NULL;
355 return;
356 }
357 }
358
359 /*
360 * if device has been registered for the given
361 * port and unit then return 1 - allows identification
362 * of which devices need to be attached or detached
363 */
364 static int detach_maple_device(struct device *device, void *portptr)
365 {
366 struct maple_device_specify *ds;
367 struct maple_device *mdev;
368
369 ds = portptr;
370 mdev = to_maple_dev(device);
371 if (mdev->port == ds->port && mdev->unit == ds->unit)
372 return 1;
373 return 0;
374 }
375
376 static int setup_maple_commands(struct device *device, void *ignored)
377 {
378 struct maple_device *maple_dev = to_maple_dev(device);
379
380 if ((maple_dev->interval > 0)
381 && time_after(jiffies, maple_dev->when)) {
382 maple_dev->when = jiffies + maple_dev->interval;
383 maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
384 maple_dev->mq->sendbuf = &maple_dev->function;
385 maple_dev->mq->length = 1;
386 maple_add_packet(maple_dev->mq);
387 liststatus++;
388 } else {
389 if (time_after(jiffies, maple_pnp_time)) {
390 maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
391 maple_dev->mq->length = 0;
392 maple_add_packet(maple_dev->mq);
393 liststatus++;
394 }
395 }
396
397 return 0;
398 }
399
400 /* VBLANK bottom half - implemented via workqueue */
401 static void maple_vblank_handler(struct work_struct *work)
402 {
403 if (!maple_dma_done())
404 return;
405 if (!list_empty(&maple_sentq))
406 return;
407 ctrl_outl(0, MAPLE_ENABLE);
408 liststatus = 0;
409 bus_for_each_dev(&maple_bus_type, NULL, NULL,
410 setup_maple_commands);
411 if (time_after(jiffies, maple_pnp_time))
412 maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
413 if (liststatus && list_empty(&maple_sentq)) {
414 INIT_LIST_HEAD(&maple_sentq);
415 maple_send();
416 }
417 maplebus_dma_reset();
418 }
419
420 /* handle devices added via hotplugs - placing them on queue for DEVINFO*/
421 static void maple_map_subunits(struct maple_device *mdev, int submask)
422 {
423 int retval, k, devcheck;
424 struct maple_device *mdev_add;
425 struct maple_device_specify ds;
426
427 for (k = 0; k < 5; k++) {
428 ds.port = mdev->port;
429 ds.unit = k + 1;
430 retval =
431 bus_for_each_dev(&maple_bus_type, NULL, &ds,
432 detach_maple_device);
433 if (retval) {
434 submask = submask >> 1;
435 continue;
436 }
437 devcheck = submask & 0x01;
438 if (devcheck) {
439 mdev_add = maple_alloc_dev(mdev->port, k + 1);
440 if (!mdev_add)
441 return;
442 mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
443 mdev_add->mq->length = 0;
444 maple_add_packet(mdev_add->mq);
445 scanning = 1;
446 }
447 submask = submask >> 1;
448 }
449 }
450
451 /* mark a device as removed */
452 static void maple_clean_submap(struct maple_device *mdev)
453 {
454 int killbit;
455
456 killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
457 killbit = ~killbit;
458 killbit &= 0xFF;
459 subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
460 }
461
462 /* handle empty port or hotplug removal */
463 static void maple_response_none(struct maple_device *mdev,
464 struct mapleq *mq)
465 {
466 if (mdev->unit != 0) {
467 list_del(&mq->list);
468 maple_clean_submap(mdev);
469 printk(KERN_INFO
470 "Maple bus device detaching at (%d, %d)\n",
471 mdev->port, mdev->unit);
472 maple_detach_driver(mdev);
473 return;
474 }
475 if (!started) {
476 printk(KERN_INFO "No maple devices attached to port %d\n",
477 mdev->port);
478 return;
479 }
480 maple_clean_submap(mdev);
481 }
482
483 /* preprocess hotplugs or scans */
484 static void maple_response_devinfo(struct maple_device *mdev,
485 char *recvbuf)
486 {
487 char submask;
488 if ((!started) || (scanning == 2)) {
489 maple_attach_driver(mdev);
490 return;
491 }
492 if (mdev->unit == 0) {
493 submask = recvbuf[2] & 0x1F;
494 if (submask ^ subdevice_map[mdev->port]) {
495 maple_map_subunits(mdev, submask);
496 subdevice_map[mdev->port] = submask;
497 }
498 }
499 }
500
501 /* maple dma end bottom half - implemented via workqueue */
502 static void maple_dma_handler(struct work_struct *work)
503 {
504 struct mapleq *mq, *nmq;
505 struct maple_device *dev;
506 char *recvbuf;
507 enum maple_code code;
508
509 if (!maple_dma_done())
510 return;
511 ctrl_outl(0, MAPLE_ENABLE);
512 if (!list_empty(&maple_sentq)) {
513 list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
514 recvbuf = mq->recvbuf;
515 code = recvbuf[0];
516 dev = mq->dev;
517 switch (code) {
518 case MAPLE_RESPONSE_NONE:
519 maple_response_none(dev, mq);
520 break;
521
522 case MAPLE_RESPONSE_DEVINFO:
523 maple_response_devinfo(dev, recvbuf);
524 break;
525
526 case MAPLE_RESPONSE_DATATRF:
527 if (dev->callback)
528 dev->callback(mq);
529 break;
530
531 case MAPLE_RESPONSE_FILEERR:
532 case MAPLE_RESPONSE_AGAIN:
533 case MAPLE_RESPONSE_BADCMD:
534 case MAPLE_RESPONSE_BADFUNC:
535 printk(KERN_DEBUG
536 "Maple non-fatal error 0x%X\n",
537 code);
538 break;
539
540 case MAPLE_RESPONSE_ALLINFO:
541 printk(KERN_DEBUG
542 "Maple - extended device information"
543 " not supported\n");
544 break;
545
546 case MAPLE_RESPONSE_OK:
547 break;
548
549 default:
550 break;
551 }
552 }
553 INIT_LIST_HEAD(&maple_sentq);
554 if (scanning == 1) {
555 maple_send();
556 scanning = 2;
557 } else
558 scanning = 0;
559
560 if (started == 0)
561 started = 1;
562 }
563 maplebus_dma_reset();
564 }
565
566 static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
567 {
568 /* Load everything into the bottom half */
569 schedule_work(&maple_dma_process);
570 return IRQ_HANDLED;
571 }
572
573 static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
574 {
575 schedule_work(&maple_vblank_process);
576 return IRQ_HANDLED;
577 }
578
579 static int maple_set_dma_interrupt_handler(void)
580 {
581 return request_irq(HW_EVENT_MAPLE_DMA, maplebus_dma_interrupt,
582 IRQF_SHARED, "maple bus DMA", &maple_dummy_driver);
583 }
584
585 static int maple_set_vblank_interrupt_handler(void)
586 {
587 return request_irq(HW_EVENT_VSYNC, maplebus_vblank_interrupt,
588 IRQF_SHARED, "maple bus VBLANK", &maple_dummy_driver);
589 }
590
591 static int maple_get_dma_buffer(void)
592 {
593 maple_sendbuf =
594 (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
595 MAPLE_DMA_PAGES);
596 if (!maple_sendbuf)
597 return -ENOMEM;
598 return 0;
599 }
600
601 static int match_maple_bus_driver(struct device *devptr,
602 struct device_driver *drvptr)
603 {
604 struct maple_driver *maple_drv;
605 struct maple_device *maple_dev;
606
607 maple_drv = container_of(drvptr, struct maple_driver, drv);
608 maple_dev = container_of(devptr, struct maple_device, dev);
609 /* Trap empty port case */
610 if (maple_dev->devinfo.function == 0xFFFFFFFF)
611 return 0;
612 else if (maple_dev->devinfo.function &
613 be32_to_cpu(maple_drv->function))
614 return 1;
615 return 0;
616 }
617
618 static int maple_bus_uevent(struct device *dev,
619 struct kobj_uevent_env *env)
620 {
621 return 0;
622 }
623
624 static void maple_bus_release(struct device *dev)
625 {
626 }
627
628 static struct maple_driver maple_dummy_driver = {
629 .drv = {
630 .name = "maple_dummy_driver",
631 .bus = &maple_bus_type,
632 },
633 };
634
635 struct bus_type maple_bus_type = {
636 .name = "maple",
637 .match = match_maple_bus_driver,
638 .uevent = maple_bus_uevent,
639 };
640 EXPORT_SYMBOL_GPL(maple_bus_type);
641
642 static struct device maple_bus = {
643 .bus_id = "maple",
644 .release = maple_bus_release,
645 };
646
647 static int __init maple_bus_init(void)
648 {
649 int retval, i;
650 struct maple_device *mdev[MAPLE_PORTS];
651 ctrl_outl(0, MAPLE_STATE);
652
653 retval = device_register(&maple_bus);
654 if (retval)
655 goto cleanup;
656
657 retval = bus_register(&maple_bus_type);
658 if (retval)
659 goto cleanup_device;
660
661 retval = driver_register(&maple_dummy_driver.drv);
662 if (retval)
663 goto cleanup_bus;
664
665 /* allocate memory for maple bus dma */
666 retval = maple_get_dma_buffer();
667 if (retval) {
668 printk(KERN_INFO
669 "Maple bus: Failed to allocate Maple DMA buffers\n");
670 goto cleanup_basic;
671 }
672
673 /* set up DMA interrupt handler */
674 retval = maple_set_dma_interrupt_handler();
675 if (retval) {
676 printk(KERN_INFO
677 "Maple bus: Failed to grab maple DMA IRQ\n");
678 goto cleanup_dma;
679 }
680
681 /* set up VBLANK interrupt handler */
682 retval = maple_set_vblank_interrupt_handler();
683 if (retval) {
684 printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
685 goto cleanup_irq;
686 }
687
688 maple_queue_cache =
689 kmem_cache_create("maple_queue_cache", 0x400, 0,
690 SLAB_POISON|SLAB_HWCACHE_ALIGN, NULL);
691
692 if (!maple_queue_cache)
693 goto cleanup_bothirqs;
694
695 /* setup maple ports */
696 for (i = 0; i < MAPLE_PORTS; i++) {
697 mdev[i] = maple_alloc_dev(i, 0);
698 if (!mdev[i]) {
699 while (i-- > 0)
700 maple_free_dev(mdev[i]);
701 goto cleanup_cache;
702 }
703 mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
704 mdev[i]->mq->length = 0;
705 maple_add_packet(mdev[i]->mq);
706 /* delay aids hardware detection */
707 mdelay(5);
708 subdevice_map[i] = 0;
709 }
710
711 realscan = 1;
712 /* setup maplebus hardware */
713 maplebus_dma_reset();
714 /* initial detection */
715 maple_send();
716 maple_pnp_time = jiffies;
717 printk(KERN_INFO "Maple bus core now registered.\n");
718
719 return 0;
720
721 cleanup_cache:
722 kmem_cache_destroy(maple_queue_cache);
723
724 cleanup_bothirqs:
725 free_irq(HW_EVENT_VSYNC, 0);
726
727 cleanup_irq:
728 free_irq(HW_EVENT_MAPLE_DMA, 0);
729
730 cleanup_dma:
731 free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
732
733 cleanup_basic:
734 driver_unregister(&maple_dummy_driver.drv);
735
736 cleanup_bus:
737 bus_unregister(&maple_bus_type);
738
739 cleanup_device:
740 device_unregister(&maple_bus);
741
742 cleanup:
743 printk(KERN_INFO "Maple bus registration failed\n");
744 return retval;
745 }
746 /* Push init to later to ensure hardware gets detected */
747 fs_initcall(maple_bus_init);
WRT350N Kernel Patches