summaryrefslogtreecommitdiffstats
path: root/drivers/usb/storage/jumpshot.c
blob: 61097cbb1585047e6893a8f59aec52de4771afdc (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
/* Driver for Lexar "Jumpshot" Compact Flash reader
 *
 * $Id: jumpshot.c,v 1.7 2002/02/25 00:40:13 mdharm Exp $
 *
 * jumpshot driver v0.1:
 *
 * First release
 *
 * Current development and maintenance by:
 *   (c) 2000 Jimmie Mayfield (mayfield+usb@sackheads.org)
 *
 *   Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver
 *   which I used as a template for this driver.
 *
 *   Some bugfixes and scatter-gather code by Gregory P. Smith 
 *   (greg-usb@electricrain.com)
 *
 *   Fix for media change by Joerg Schneider (js@joergschneider.com)
 *
 * Developed with the assistance of:
 *
 *   (C) 2002 Alan Stern <stern@rowland.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
 /*
  * This driver attempts to support the Lexar Jumpshot USB CompactFlash 
  * reader.  Like many other USB CompactFlash readers, the Jumpshot contains
  * a USB-to-ATA chip. 
  *
  * This driver supports reading and writing.  If you're truly paranoid,
  * however, you can force the driver into a write-protected state by setting
  * the WP enable bits in jumpshot_handle_mode_sense.  See the comments
  * in that routine.
  */

#include <linux/errno.h>
#include <linux/slab.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "jumpshot.h"


static inline int jumpshot_bulk_read(struct us_data *us,
				     unsigned char *data, 
				     unsigned int len)
{
	if (len == 0)
		return USB_STOR_XFER_GOOD;

	US_DEBUGP("jumpshot_bulk_read:  len = %d\n", len);
	return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
			data, len, NULL);
}


static inline int jumpshot_bulk_write(struct us_data *us,
				      unsigned char *data, 
				      unsigned int len)
{
	if (len == 0)
		return USB_STOR_XFER_GOOD;

	US_DEBUGP("jumpshot_bulk_write:  len = %d\n", len);
	return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
			data, len, NULL);
}


static int jumpshot_get_status(struct us_data  *us)
{
	int rc;

	if (!us)
		return USB_STOR_TRANSPORT_ERROR;

	// send the setup
	rc = usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe,
				   0, 0xA0, 0, 7, us->iobuf, 1);

	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	if (us->iobuf[0] != 0x50) {
		US_DEBUGP("jumpshot_get_status:  0x%2x\n",
			  us->iobuf[0]);
		return USB_STOR_TRANSPORT_ERROR;
	}

	return USB_STOR_TRANSPORT_GOOD;
}

static int jumpshot_read_data(struct us_data *us,
			      struct jumpshot_info *info,
			      u32 sector,
			      u32 sectors)
{
	unsigned char *command = us->iobuf;
	unsigned char *buffer;
	unsigned char  thistime;
	unsigned int totallen, alloclen;
	int len, result;
	unsigned int sg_offset = 0;
	struct scatterlist *sg = NULL;

	// we're working in LBA mode.  according to the ATA spec, 
	// we can support up to 28-bit addressing.  I don't know if Jumpshot
	// supports beyond 24-bit addressing.  It's kind of hard to test 
	// since it requires > 8GB CF card.

	if (sector > 0x0FFFFFFF)
		return USB_STOR_TRANSPORT_ERROR;

	totallen = sectors * info->ssize;

	// Since we don't read more than 64 KB at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	alloclen = min(totallen, 65536u);
	buffer = kmalloc(alloclen, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;

	do {
		// loop, never allocate or transfer more than 64k at once
		// (min(128k, 255*info->ssize) is the real limit)
		len = min(totallen, alloclen);
		thistime = (len / info->ssize) & 0xff;

		command[0] = 0;
		command[1] = thistime;
		command[2] = sector & 0xFF;
		command[3] = (sector >>  8) & 0xFF;
		command[4] = (sector >> 16) & 0xFF;

		command[5] = 0xE0 | ((sector >> 24) & 0x0F);
		command[6] = 0x20;

		// send the setup + command
		result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
					       0, 0x20, 0, 1, command, 7);
		if (result != USB_STOR_XFER_GOOD)
			goto leave;

		// read the result
		result = jumpshot_bulk_read(us, buffer, len);
		if (result != USB_STOR_XFER_GOOD)
			goto leave;

		US_DEBUGP("jumpshot_read_data:  %d bytes\n", len);

		// Store the data in the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				 &sg, &sg_offset, TO_XFER_BUF);

		sector += thistime;
		totallen -= len;
	} while (totallen > 0);

	kfree(buffer);
	return USB_STOR_TRANSPORT_GOOD;

 leave:
	kfree(buffer);
	return USB_STOR_TRANSPORT_ERROR;
}


static int jumpshot_write_data(struct us_data *us,
			       struct jumpshot_info *info,
			       u32 sector,
			       u32 sectors)
{
	unsigned char *command = us->iobuf;
	unsigned char *buffer;
	unsigned char  thistime;
	unsigned int totallen, alloclen;
	int len, result, waitcount;
	unsigned int sg_offset = 0;
	struct scatterlist *sg = NULL;

	// we're working in LBA mode.  according to the ATA spec, 
	// we can support up to 28-bit addressing.  I don't know if Jumpshot
	// supports beyond 24-bit addressing.  It's kind of hard to test 
	// since it requires > 8GB CF card.
	//
	if (sector > 0x0FFFFFFF)
		return USB_STOR_TRANSPORT_ERROR;

	totallen = sectors * info->ssize;

	// Since we don't write more than 64 KB at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	alloclen = min(totallen, 65536u);
	buffer = kmalloc(alloclen, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;

	do {
		// loop, never allocate or transfer more than 64k at once
		// (min(128k, 255*info->ssize) is the real limit)

		len = min(totallen, alloclen);
		thistime = (len / info->ssize) & 0xff;

		// Get the data from the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&sg, &sg_offset, FROM_XFER_BUF);

		command[0] = 0;
		command[1] = thistime;
		command[2] = sector & 0xFF;
		command[3] = (sector >>  8) & 0xFF;
		command[4] = (sector >> 16) & 0xFF;

		command[5] = 0xE0 | ((sector >> 24) & 0x0F);
		command[6] = 0x30;

		// send the setup + command
		result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
			0, 0x20, 0, 1, command, 7);
		if (result != USB_STOR_XFER_GOOD)
			goto leave;

		// send the data
		result = jumpshot_bulk_write(us, buffer, len);
		if (result != USB_STOR_XFER_GOOD)
			goto leave;

		// read the result.  apparently the bulk write can complete
		// before the jumpshot drive is finished writing.  so we loop
		// here until we get a good return code
		waitcount = 0;
		do {
			result = jumpshot_get_status(us);
			if (result != USB_STOR_TRANSPORT_GOOD) {
				// I have not experimented to find the smallest value.
				//
				msleep(50); 
			}
		} while ((result != USB_STOR_TRANSPORT_GOOD) && (waitcount < 10));

		if (result != USB_STOR_TRANSPORT_GOOD)
			US_DEBUGP("jumpshot_write_data:  Gah!  Waitcount = 10.  Bad write!?\n");

		sector += thistime;
		totallen -= len;
	} while (totallen > 0);

	kfree(buffer);
	return result;

 leave:
	kfree(buffer);
	return USB_STOR_TRANSPORT_ERROR;
}

static int jumpshot_id_device(struct us_data *us,
			      struct jumpshot_info *info)
{
	unsigned char *command = us->iobuf;
	unsigned char *reply;
	int 	 rc;

	if (!us || !info)
		return USB_STOR_TRANSPORT_ERROR;

	command[0] = 0xE0;
	command[1] = 0xEC;
	reply = kmalloc(512, GFP_NOIO);
	if (!reply)
		return USB_STOR_TRANSPORT_ERROR;

	// send the setup
	rc = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
				   0, 0x20, 0, 6, command, 2);

	if (rc != USB_STOR_XFER_GOOD) {
		US_DEBUGP("jumpshot_id_device:  Gah! "
			  "send_control for read_capacity failed\n");
		rc = USB_STOR_TRANSPORT_ERROR;
		goto leave;
	}

	// read the reply
	rc = jumpshot_bulk_read(us, reply, 512);
	if (rc != USB_STOR_XFER_GOOD) {
		rc = USB_STOR_TRANSPORT_ERROR;
		goto leave;
	}

	info->sectors = ((u32)(reply[117]) << 24) |
			((u32)(reply[116]) << 16) |
			((u32)(reply[115]) <<  8) |
			((u32)(reply[114])      );

	rc = USB_STOR_TRANSPORT_GOOD;

 leave:
	kfree(reply);
	return rc;
}

static int jumpshot_handle_mode_sense(struct us_data *us,
				      struct scsi_cmnd * srb, 
				      int sense_6)
{
	static unsigned char rw_err_page[12] = {
		0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
	};
	static unsigned char cache_page[12] = {
		0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
	};
	static unsigned char rbac_page[12] = {
		0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
	};
	static unsigned char timer_page[8] = {
		0x1C, 0x6, 0, 0, 0, 0
	};
	unsigned char pc, page_code;
	unsigned int i = 0;
	struct jumpshot_info *info = (struct jumpshot_info *) (us->extra);
	unsigned char *ptr = us->iobuf;

	pc = srb->cmnd[2] >> 6;
	page_code = srb->cmnd[2] & 0x3F;

	switch (pc) {
	   case 0x0:
		US_DEBUGP("jumpshot_handle_mode_sense:  Current values\n");
		break;
	   case 0x1:
		US_DEBUGP("jumpshot_handle_mode_sense:  Changeable values\n");
		break;
	   case 0x2:
		US_DEBUGP("jumpshot_handle_mode_sense:  Default values\n");
		break;
	   case 0x3:
		US_DEBUGP("jumpshot_handle_mode_sense:  Saves values\n");
		break;
	}

	memset(ptr, 0, 8);
	if (sense_6) {
		ptr[2] = 0x00;		// WP enable: 0x80
		i = 4;
	} else {
		ptr[3] = 0x00;		// WP enable: 0x80
		i = 8;
	}

	switch (page_code) {
	   case 0x0:
		// vendor-specific mode
		info->sense_key = 0x05;
		info->sense_asc = 0x24;
		info->sense_ascq = 0x00;
		return USB_STOR_TRANSPORT_FAILED;

	   case 0x1:
		memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
		i += sizeof(rw_err_page);
		break;

	   case 0x8:
		memcpy(ptr + i, cache_page, sizeof(cache_page));
		i += sizeof(cache_page);
		break;

	   case 0x1B:
		memcpy(ptr + i, rbac_page, sizeof(rbac_page));
		i += sizeof(rbac_page);
		break;

	   case 0x1C:
		memcpy(ptr + i, timer_page, sizeof(timer_page));
		i += sizeof(timer_page);
		break;

	   case 0x3F:
		memcpy(ptr + i, timer_page, sizeof(timer_page));
		i += sizeof(timer_page);
		memcpy(ptr + i, rbac_page, sizeof(rbac_page));
		i += sizeof(rbac_page);
		memcpy(ptr + i, cache_page, sizeof(cache_page));
		i += sizeof(cache_page);
		memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
		i += sizeof(rw_err_page);
		break;
	}

	if (sense_6)
		ptr[0] = i - 1;
	else
		((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
	usb_stor_set_xfer_buf(ptr, i, srb);

	return USB_STOR_TRANSPORT_GOOD;
}


static void jumpshot_info_destructor(void *extra)
{
	// this routine is a placeholder...
	// currently, we don't allocate any extra blocks so we're okay
}



// Transport for the Lexar 'Jumpshot'
//
int jumpshot_transport(struct scsi_cmnd * srb, struct us_data *us)
{
	struct jumpshot_info *info;
	int rc;
	unsigned long block, blocks;
	unsigned char *ptr = us->iobuf;
	static unsigned char inquiry_response[8] = {
		0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
	};

	if (!us->extra) {
		us->extra = kzalloc(sizeof(struct jumpshot_info), GFP_NOIO);
		if (!us->extra) {
			US_DEBUGP("jumpshot_transport:  Gah! Can't allocate storage for jumpshot info struct!\n");
			return USB_STOR_TRANSPORT_ERROR;
		}
		us->extra_destructor = jumpshot_info_destructor;
	}

	info = (struct jumpshot_info *) (us->extra);

	if (srb->cmnd[0] == INQUIRY) {
		US_DEBUGP("jumpshot_transport:  INQUIRY.  Returning bogus response.\n");
		memcpy(ptr, inquiry_response, sizeof(inquiry_response));
		fill_inquiry_response(us, ptr, 36);
		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == READ_CAPACITY) {
		info->ssize = 0x200;  // hard coded 512 byte sectors as per ATA spec

		rc = jumpshot_get_status(us);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		rc = jumpshot_id_device(us, info);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		US_DEBUGP("jumpshot_transport:  READ_CAPACITY:  %ld sectors, %ld bytes per sector\n",
			  info->sectors, info->ssize);

		// build the reply
		//
		((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
		((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
		usb_stor_set_xfer_buf(ptr, 8, srb);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == MODE_SELECT_10) {
		US_DEBUGP("jumpshot_transport:  Gah! MODE_SELECT_10.\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	if (srb->cmnd[0] == READ_10) {
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

		US_DEBUGP("jumpshot_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
		return jumpshot_read_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == READ_12) {
		// I don't think we'll ever see a READ_12 but support it anyway...
		//
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
			 ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

		US_DEBUGP("jumpshot_transport:  READ_12: read block 0x%04lx  count %ld\n", block, blocks);
		return jumpshot_read_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == WRITE_10) {
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

		US_DEBUGP("jumpshot_transport:  WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
		return jumpshot_write_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == WRITE_12) {
		// I don't think we'll ever see a WRITE_12 but support it anyway...
		//
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
			 ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

		US_DEBUGP("jumpshot_transport:  WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
		return jumpshot_write_data(us, info, block, blocks);
	}


	if (srb->cmnd[0] == TEST_UNIT_READY) {
		US_DEBUGP("jumpshot_transport:  TEST_UNIT_READY.\n");
		return jumpshot_get_status(us);
	}

	if (srb->cmnd[0] == REQUEST_SENSE) {
		US_DEBUGP("jumpshot_transport:  REQUEST_SENSE.\n");

		memset(ptr, 0, 18);
		ptr[0] = 0xF0;
		ptr[2] = info->sense_key;
		ptr[7] = 11;
		ptr[12] = info->sense_asc;
		ptr[13] = info->sense_ascq;
		usb_stor_set_xfer_buf(ptr, 18, srb);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == MODE_SENSE) {
		US_DEBUGP("jumpshot_transport:  MODE_SENSE_6 detected\n");
		return jumpshot_handle_mode_sense(us, srb, 1);
	}

	if (srb->cmnd[0] == MODE_SENSE_10) {
		US_DEBUGP("jumpshot_transport:  MODE_SENSE_10 detected\n");
		return jumpshot_handle_mode_sense(us, srb, 0);
	}

	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
		// sure.  whatever.  not like we can stop the user from popping
		// the media out of the device (no locking doors, etc)
		//
		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == START_STOP) {
		/* this is used by sd.c'check_scsidisk_media_change to detect
		   media change */
		US_DEBUGP("jumpshot_transport:  START_STOP.\n");
		/* the first jumpshot_id_device after a media change returns
		   an error (determined experimentally) */
		rc = jumpshot_id_device(us, info);
		if (rc == USB_STOR_TRANSPORT_GOOD) {
			info->sense_key = NO_SENSE;
			srb->result = SUCCESS;
		} else {
			info->sense_key = UNIT_ATTENTION;
			srb->result = SAM_STAT_CHECK_CONDITION;
		}
		return rc;
	}

	US_DEBUGP("jumpshot_transport:  Gah! Unknown command: %d (0x%x)\n",
		  srb->cmnd[0], srb->cmnd[0]);
	info->sense_key = 0x05;
	info->sense_asc = 0x20;
	info->sense_ascq = 0x00;
	return USB_STOR_TRANSPORT_FAILED;
}