summaryrefslogtreecommitdiff
path: root/drivers/memstick/core/memstick.c
blob: 4303b7ef73e2854a6ec9926f27214d9106c6909f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
/*
 *  Sony MemoryStick support
 *
 *  Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Special thanks to Carlos Corbacho for providing various MemoryStick cards
 * that made this driver possible.
 *
 */

#include <linux/memstick.h>
#include <linux/idr.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/slab.h>

#define DRIVER_NAME "memstick"

static unsigned int cmd_retries = 3;
module_param(cmd_retries, uint, 0644);

static struct workqueue_struct *workqueue;
static DEFINE_IDR(memstick_host_idr);
static DEFINE_SPINLOCK(memstick_host_lock);

static int memstick_dev_match(struct memstick_dev *card,
			      struct memstick_device_id *id)
{
	if (id->match_flags & MEMSTICK_MATCH_ALL) {
		if ((id->type == card->id.type)
		    && (id->category == card->id.category)
		    && (id->class == card->id.class))
			return 1;
	}

	return 0;
}

static int memstick_bus_match(struct device *dev, struct device_driver *drv)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						 dev);
	struct memstick_driver *ms_drv = container_of(drv,
						      struct memstick_driver,
						      driver);
	struct memstick_device_id *ids = ms_drv->id_table;

	if (ids) {
		while (ids->match_flags) {
			if (memstick_dev_match(card, ids))
				return 1;
			++ids;
		}
	}
	return 0;
}

static int memstick_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						  dev);

	if (add_uevent_var(env, "MEMSTICK_TYPE=%02X", card->id.type))
		return -ENOMEM;

	if (add_uevent_var(env, "MEMSTICK_CATEGORY=%02X", card->id.category))
		return -ENOMEM;

	if (add_uevent_var(env, "MEMSTICK_CLASS=%02X", card->id.class))
		return -ENOMEM;

	return 0;
}

static int memstick_device_probe(struct device *dev)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						 dev);
	struct memstick_driver *drv = container_of(dev->driver,
						   struct memstick_driver,
						   driver);
	int rc = -ENODEV;

	if (dev->driver && drv->probe) {
		rc = drv->probe(card);
		if (!rc)
			get_device(dev);
	}
	return rc;
}

static int memstick_device_remove(struct device *dev)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						  dev);
	struct memstick_driver *drv = container_of(dev->driver,
						   struct memstick_driver,
						   driver);

	if (dev->driver && drv->remove) {
		drv->remove(card);
		card->dev.driver = NULL;
	}

	put_device(dev);
	return 0;
}

#ifdef CONFIG_PM

static int memstick_device_suspend(struct device *dev, pm_message_t state)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						  dev);
	struct memstick_driver *drv = container_of(dev->driver,
						   struct memstick_driver,
						   driver);

	if (dev->driver && drv->suspend)
		return drv->suspend(card, state);
	return 0;
}

static int memstick_device_resume(struct device *dev)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						  dev);
	struct memstick_driver *drv = container_of(dev->driver,
						   struct memstick_driver,
						   driver);

	if (dev->driver && drv->resume)
		return drv->resume(card);
	return 0;
}

#else

#define memstick_device_suspend NULL
#define memstick_device_resume NULL

#endif /* CONFIG_PM */

#define MEMSTICK_ATTR(name, format)                                           \
static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
			    char *buf)                                        \
{                                                                             \
	struct memstick_dev *card = container_of(dev, struct memstick_dev,    \
						 dev);                        \
	return sprintf(buf, format, card->id.name);                           \
}

MEMSTICK_ATTR(type, "%02X");
MEMSTICK_ATTR(category, "%02X");
MEMSTICK_ATTR(class, "%02X");

#define MEMSTICK_ATTR_RO(name) __ATTR(name, S_IRUGO, name##_show, NULL)

static struct device_attribute memstick_dev_attrs[] = {
	MEMSTICK_ATTR_RO(type),
	MEMSTICK_ATTR_RO(category),
	MEMSTICK_ATTR_RO(class),
	__ATTR_NULL
};

static struct bus_type memstick_bus_type = {
	.name           = "memstick",
	.dev_attrs      = memstick_dev_attrs,
	.match          = memstick_bus_match,
	.uevent         = memstick_uevent,
	.probe          = memstick_device_probe,
	.remove         = memstick_device_remove,
	.suspend        = memstick_device_suspend,
	.resume         = memstick_device_resume
};

static void memstick_free(struct device *dev)
{
	struct memstick_host *host = container_of(dev, struct memstick_host,
						  dev);
	kfree(host);
}

static struct class memstick_host_class = {
	.name        = "memstick_host",
	.dev_release = memstick_free
};

static void memstick_free_card(struct device *dev)
{
	struct memstick_dev *card = container_of(dev, struct memstick_dev,
						 dev);
	kfree(card);
}

static int memstick_dummy_check(struct memstick_dev *card)
{
	return 0;
}

/**
 * memstick_detect_change - schedule media detection on memstick host
 * @host - host to use
 */
void memstick_detect_change(struct memstick_host *host)
{
	queue_work(workqueue, &host->media_checker);
}
EXPORT_SYMBOL(memstick_detect_change);

/**
 * memstick_next_req - called by host driver to obtain next request to process
 * @host - host to use
 * @mrq - pointer to stick the request to
 *
 * Host calls this function from idle state (*mrq == NULL) or after finishing
 * previous request (*mrq should point to it). If previous request was
 * unsuccessful, it is retried for predetermined number of times. Return value
 * of 0 means that new request was assigned to the host.
 */
int memstick_next_req(struct memstick_host *host, struct memstick_request **mrq)
{
	int rc = -ENXIO;

	if ((*mrq) && (*mrq)->error && host->retries) {
		(*mrq)->error = rc;
		host->retries--;
		return 0;
	}

	if (host->card && host->card->next_request)
		rc = host->card->next_request(host->card, mrq);

	if (!rc)
		host->retries = cmd_retries > 1 ? cmd_retries - 1 : 1;
	else
		*mrq = NULL;

	return rc;
}
EXPORT_SYMBOL(memstick_next_req);

/**
 * memstick_new_req - notify the host that some requests are pending
 * @host - host to use
 */
void memstick_new_req(struct memstick_host *host)
{
	if (host->card) {
		host->retries = cmd_retries;
		INIT_COMPLETION(host->card->mrq_complete);
		host->request(host);
	}
}
EXPORT_SYMBOL(memstick_new_req);

/**
 * memstick_init_req_sg - set request fields needed for bulk data transfer
 * @mrq - request to use
 * @tpc - memstick Transport Protocol Command
 * @sg - TPC argument
 */
void memstick_init_req_sg(struct memstick_request *mrq, unsigned char tpc,
			  const struct scatterlist *sg)
{
	mrq->tpc = tpc;
	if (tpc & 8)
		mrq->data_dir = WRITE;
	else
		mrq->data_dir = READ;

	mrq->sg = *sg;
	mrq->long_data = 1;

	if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
		mrq->need_card_int = 1;
	else
		mrq->need_card_int = 0;
}
EXPORT_SYMBOL(memstick_init_req_sg);

/**
 * memstick_init_req - set request fields needed for short data transfer
 * @mrq - request to use
 * @tpc - memstick Transport Protocol Command
 * @buf - TPC argument buffer
 * @length - TPC argument size
 *
 * The intended use of this function (transfer of data items several bytes
 * in size) allows us to just copy the value between request structure and
 * user supplied buffer.
 */
void memstick_init_req(struct memstick_request *mrq, unsigned char tpc,
		       const void *buf, size_t length)
{
	mrq->tpc = tpc;
	if (tpc & 8)
		mrq->data_dir = WRITE;
	else
		mrq->data_dir = READ;

	mrq->data_len = length > sizeof(mrq->data) ? sizeof(mrq->data) : length;
	if (mrq->data_dir == WRITE)
		memcpy(mrq->data, buf, mrq->data_len);

	mrq->long_data = 0;

	if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
		mrq->need_card_int = 1;
	else
		mrq->need_card_int = 0;
}
EXPORT_SYMBOL(memstick_init_req);

/*
 * Functions prefixed with "h_" are protocol callbacks. They can be called from
 * interrupt context. Return value of 0 means that request processing is still
 * ongoing, while special error value of -EAGAIN means that current request is
 * finished (and request processor should come back some time later).
 */

static int h_memstick_read_dev_id(struct memstick_dev *card,
				  struct memstick_request **mrq)
{
	struct ms_id_register id_reg;

	if (!(*mrq)) {
		memstick_init_req(&card->current_mrq, MS_TPC_READ_REG, NULL,
				  sizeof(struct ms_id_register));
		*mrq = &card->current_mrq;
		return 0;
	} else {
		if (!(*mrq)->error) {
			memcpy(&id_reg, (*mrq)->data, sizeof(id_reg));
			card->id.match_flags = MEMSTICK_MATCH_ALL;
			card->id.type = id_reg.type;
			card->id.category = id_reg.category;
			card->id.class = id_reg.class;
			dev_dbg(&card->dev, "if_mode = %02x\n", id_reg.if_mode);
		}
		complete(&card->mrq_complete);
		return -EAGAIN;
	}
}

static int h_memstick_set_rw_addr(struct memstick_dev *card,
				  struct memstick_request **mrq)
{
	if (!(*mrq)) {
		memstick_init_req(&card->current_mrq, MS_TPC_SET_RW_REG_ADRS,
				  (char *)&card->reg_addr,
				  sizeof(card->reg_addr));
		*mrq = &card->current_mrq;
		return 0;
	} else {
		complete(&card->mrq_complete);
		return -EAGAIN;
	}
}

/**
 * memstick_set_rw_addr - issue SET_RW_REG_ADDR request and wait for it to
 *                        complete
 * @card - media device to use
 */
int memstick_set_rw_addr(struct memstick_dev *card)
{
	card->next_request = h_memstick_set_rw_addr;
	memstick_new_req(card->host);
	wait_for_completion(&card->mrq_complete);

	return card->current_mrq.error;
}
EXPORT_SYMBOL(memstick_set_rw_addr);

static struct memstick_dev *memstick_alloc_card(struct memstick_host *host)
{
	struct memstick_dev *card = kzalloc(sizeof(struct memstick_dev),
					    GFP_KERNEL);
	struct memstick_dev *old_card = host->card;
	struct ms_id_register id_reg;

	if (card) {
		card->host = host;
		dev_set_name(&card->dev, "%s", dev_name(&host->dev));
		card->dev.parent = &host->dev;
		card->dev.bus = &memstick_bus_type;
		card->dev.release = memstick_free_card;
		card->check = memstick_dummy_check;

		card->reg_addr.r_offset = offsetof(struct ms_register, id);
		card->reg_addr.r_length = sizeof(id_reg);
		card->reg_addr.w_offset = offsetof(struct ms_register, id);
		card->reg_addr.w_length = sizeof(id_reg);

		init_completion(&card->mrq_complete);

		host->card = card;
		if (memstick_set_rw_addr(card))
			goto err_out;

		card->next_request = h_memstick_read_dev_id;
		memstick_new_req(host);
		wait_for_completion(&card->mrq_complete);

		if (card->current_mrq.error)
			goto err_out;
	}
	host->card = old_card;
	return card;
err_out:
	host->card = old_card;
	kfree(card);
	return NULL;
}

static int memstick_power_on(struct memstick_host *host)
{
	int rc = host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_ON);

	if (!rc)
		rc = host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_SERIAL);

	return rc;
}

static void memstick_check(struct work_struct *work)
{
	struct memstick_host *host = container_of(work, struct memstick_host,
						  media_checker);
	struct memstick_dev *card;

	dev_dbg(&host->dev, "memstick_check started\n");
	mutex_lock(&host->lock);
	if (!host->card) {
		if (memstick_power_on(host))
			goto out_power_off;
	} else if (host->card->stop)
		host->card->stop(host->card);

	card = memstick_alloc_card(host);

	if (!card) {
		if (host->card) {
			device_unregister(&host->card->dev);
			host->card = NULL;
		}
	} else {
		dev_dbg(&host->dev, "new card %02x, %02x, %02x\n",
			card->id.type, card->id.category, card->id.class);
		if (host->card) {
			if (memstick_set_rw_addr(host->card)
			    || !memstick_dev_match(host->card, &card->id)
			    || !(host->card->check(host->card))) {
				device_unregister(&host->card->dev);
				host->card = NULL;
			} else if (host->card->start)
				host->card->start(host->card);
		}

		if (!host->card) {
			host->card = card;
			if (device_register(&card->dev)) {
				put_device(&card->dev);
				kfree(host->card);
				host->card = NULL;
			}
		} else
			kfree(card);
	}

out_power_off:
	if (!host->card)
		host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);

	mutex_unlock(&host->lock);
	dev_dbg(&host->dev, "memstick_check finished\n");
}

/**
 * memstick_alloc_host - allocate a memstick_host structure
 * @extra: size of the user private data to allocate
 * @dev: parent device of the host
 */
struct memstick_host *memstick_alloc_host(unsigned int extra,
					  struct device *dev)
{
	struct memstick_host *host;

	host = kzalloc(sizeof(struct memstick_host) + extra, GFP_KERNEL);
	if (host) {
		mutex_init(&host->lock);
		INIT_WORK(&host->media_checker, memstick_check);
		host->dev.class = &memstick_host_class;
		host->dev.parent = dev;
		device_initialize(&host->dev);
	}
	return host;
}
EXPORT_SYMBOL(memstick_alloc_host);

/**
 * memstick_add_host - start request processing on memstick host
 * @host - host to use
 */
int memstick_add_host(struct memstick_host *host)
{
	int rc;

	if (!idr_pre_get(&memstick_host_idr, GFP_KERNEL))
		return -ENOMEM;

	spin_lock(&memstick_host_lock);
	rc = idr_get_new(&memstick_host_idr, host, &host->id);
	spin_unlock(&memstick_host_lock);
	if (rc)
		return rc;

	dev_set_name(&host->dev, "memstick%u", host->id);

	rc = device_add(&host->dev);
	if (rc) {
		spin_lock(&memstick_host_lock);
		idr_remove(&memstick_host_idr, host->id);
		spin_unlock(&memstick_host_lock);
		return rc;
	}

	host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
	memstick_detect_change(host);
	return 0;
}
EXPORT_SYMBOL(memstick_add_host);

/**
 * memstick_remove_host - stop request processing on memstick host
 * @host - host to use
 */
void memstick_remove_host(struct memstick_host *host)
{
	flush_workqueue(workqueue);
	mutex_lock(&host->lock);
	if (host->card)
		device_unregister(&host->card->dev);
	host->card = NULL;
	host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
	mutex_unlock(&host->lock);

	spin_lock(&memstick_host_lock);
	idr_remove(&memstick_host_idr, host->id);
	spin_unlock(&memstick_host_lock);
	device_del(&host->dev);
}
EXPORT_SYMBOL(memstick_remove_host);

/**
 * memstick_free_host - free memstick host
 * @host - host to use
 */
void memstick_free_host(struct memstick_host *host)
{
	mutex_destroy(&host->lock);
	put_device(&host->dev);
}
EXPORT_SYMBOL(memstick_free_host);

/**
 * memstick_suspend_host - notify bus driver of host suspension
 * @host - host to use
 */
void memstick_suspend_host(struct memstick_host *host)
{
	mutex_lock(&host->lock);
	host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
	mutex_unlock(&host->lock);
}
EXPORT_SYMBOL(memstick_suspend_host);

/**
 * memstick_resume_host - notify bus driver of host resumption
 * @host - host to use
 */
void memstick_resume_host(struct memstick_host *host)
{
	int rc = 0;

	mutex_lock(&host->lock);
	if (host->card)
		rc = memstick_power_on(host);
	mutex_unlock(&host->lock);

	if (!rc)
		memstick_detect_change(host);
}
EXPORT_SYMBOL(memstick_resume_host);

int memstick_register_driver(struct memstick_driver *drv)
{
	drv->driver.bus = &memstick_bus_type;

	return driver_register(&drv->driver);
}
EXPORT_SYMBOL(memstick_register_driver);

void memstick_unregister_driver(struct memstick_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(memstick_unregister_driver);


static int __init memstick_init(void)
{
	int rc;

	workqueue = create_freezeable_workqueue("kmemstick");
	if (!workqueue)
		return -ENOMEM;

	rc = bus_register(&memstick_bus_type);
	if (!rc)
		rc = class_register(&memstick_host_class);

	if (!rc)
		return 0;

	bus_unregister(&memstick_bus_type);
	destroy_workqueue(workqueue);

	return rc;
}

static void __exit memstick_exit(void)
{
	class_unregister(&memstick_host_class);
	bus_unregister(&memstick_bus_type);
	destroy_workqueue(workqueue);
	idr_destroy(&memstick_host_idr);
}

module_init(memstick_init);
module_exit(memstick_exit);

MODULE_AUTHOR("Alex Dubov");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Sony MemoryStick core driver");