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Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.git] / drivers / scsi / scsi_transport_spi.c
1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <scsi/scsi.h>
28 #include "scsi_priv.h"
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_spi.h>
35
36 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */
37 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
38 * on" attributes */
39 #define SPI_HOST_ATTRS 1
40
41 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
42
43 #define DV_LOOPS 3
44 #define DV_TIMEOUT (10*HZ)
45 #define DV_RETRIES 3 /* should only need at most
46 * two cc/ua clears */
47
48 /* Private data accessors (keep these out of the header file) */
49 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
52
53 struct spi_internal {
54 struct scsi_transport_template t;
55 struct spi_function_template *f;
56 /* The actual attributes */
57 struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
58 /* The array of null terminated pointers to attributes
59 * needed by scsi_sysfs.c */
60 struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
61 struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
62 struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
63 };
64
65 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
66
67 static const int ppr_to_ps[] = {
68 /* The PPR values 0-6 are reserved, fill them in when
69 * the committee defines them */
70 -1, /* 0x00 */
71 -1, /* 0x01 */
72 -1, /* 0x02 */
73 -1, /* 0x03 */
74 -1, /* 0x04 */
75 -1, /* 0x05 */
76 -1, /* 0x06 */
77 3125, /* 0x07 */
78 6250, /* 0x08 */
79 12500, /* 0x09 */
80 25000, /* 0x0a */
81 30300, /* 0x0b */
82 50000, /* 0x0c */
83 };
84 /* The PPR values at which you calculate the period in ns by multiplying
85 * by 4 */
86 #define SPI_STATIC_PPR 0x0c
87
88 static int sprint_frac(char *dest, int value, int denom)
89 {
90 int frac = value % denom;
91 int result = sprintf(dest, "%d", value / denom);
92
93 if (frac == 0)
94 return result;
95 dest[result++] = '.';
96
97 do {
98 denom /= 10;
99 sprintf(dest + result, "%d", frac / denom);
100 result++;
101 frac %= denom;
102 } while (frac);
103
104 dest[result++] = '\0';
105 return result;
106 }
107
108 static int spi_execute(struct scsi_device *sdev, const void *cmd,
109 enum dma_data_direction dir,
110 void *buffer, unsigned bufflen,
111 struct scsi_sense_hdr *sshdr)
112 {
113 int i, result;
114 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
115
116 for(i = 0; i < DV_RETRIES; i++) {
117 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
118 sense, DV_TIMEOUT, /* retries */ 1,
119 REQ_FAILFAST);
120 if (result & DRIVER_SENSE) {
121 struct scsi_sense_hdr sshdr_tmp;
122 if (!sshdr)
123 sshdr = &sshdr_tmp;
124
125 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
126 sshdr)
127 && sshdr->sense_key == UNIT_ATTENTION)
128 continue;
129 }
130 break;
131 }
132 return result;
133 }
134
135 static struct {
136 enum spi_signal_type value;
137 char *name;
138 } signal_types[] = {
139 { SPI_SIGNAL_UNKNOWN, "unknown" },
140 { SPI_SIGNAL_SE, "SE" },
141 { SPI_SIGNAL_LVD, "LVD" },
142 { SPI_SIGNAL_HVD, "HVD" },
143 };
144
145 static inline const char *spi_signal_to_string(enum spi_signal_type type)
146 {
147 int i;
148
149 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
150 if (type == signal_types[i].value)
151 return signal_types[i].name;
152 }
153 return NULL;
154 }
155 static inline enum spi_signal_type spi_signal_to_value(const char *name)
156 {
157 int i, len;
158
159 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
160 len = strlen(signal_types[i].name);
161 if (strncmp(name, signal_types[i].name, len) == 0 &&
162 (name[len] == '\n' || name[len] == '\0'))
163 return signal_types[i].value;
164 }
165 return SPI_SIGNAL_UNKNOWN;
166 }
167
168 static int spi_host_setup(struct transport_container *tc, struct device *dev,
169 struct class_device *cdev)
170 {
171 struct Scsi_Host *shost = dev_to_shost(dev);
172
173 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
174
175 return 0;
176 }
177
178 static DECLARE_TRANSPORT_CLASS(spi_host_class,
179 "spi_host",
180 spi_host_setup,
181 NULL,
182 NULL);
183
184 static int spi_host_match(struct attribute_container *cont,
185 struct device *dev)
186 {
187 struct Scsi_Host *shost;
188 struct spi_internal *i;
189
190 if (!scsi_is_host_device(dev))
191 return 0;
192
193 shost = dev_to_shost(dev);
194 if (!shost->transportt || shost->transportt->host_attrs.ac.class
195 != &spi_host_class.class)
196 return 0;
197
198 i = to_spi_internal(shost->transportt);
199
200 return &i->t.host_attrs.ac == cont;
201 }
202
203 static int spi_device_configure(struct transport_container *tc,
204 struct device *dev,
205 struct class_device *cdev)
206 {
207 struct scsi_device *sdev = to_scsi_device(dev);
208 struct scsi_target *starget = sdev->sdev_target;
209
210 /* Populate the target capability fields with the values
211 * gleaned from the device inquiry */
212
213 spi_support_sync(starget) = scsi_device_sync(sdev);
214 spi_support_wide(starget) = scsi_device_wide(sdev);
215 spi_support_dt(starget) = scsi_device_dt(sdev);
216 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
217 spi_support_ius(starget) = scsi_device_ius(sdev);
218 spi_support_qas(starget) = scsi_device_qas(sdev);
219
220 return 0;
221 }
222
223 static int spi_setup_transport_attrs(struct transport_container *tc,
224 struct device *dev,
225 struct class_device *cdev)
226 {
227 struct scsi_target *starget = to_scsi_target(dev);
228
229 spi_period(starget) = -1; /* illegal value */
230 spi_min_period(starget) = 0;
231 spi_offset(starget) = 0; /* async */
232 spi_max_offset(starget) = 255;
233 spi_width(starget) = 0; /* narrow */
234 spi_max_width(starget) = 1;
235 spi_iu(starget) = 0; /* no IU */
236 spi_dt(starget) = 0; /* ST */
237 spi_qas(starget) = 0;
238 spi_wr_flow(starget) = 0;
239 spi_rd_strm(starget) = 0;
240 spi_rti(starget) = 0;
241 spi_pcomp_en(starget) = 0;
242 spi_hold_mcs(starget) = 0;
243 spi_dv_pending(starget) = 0;
244 spi_dv_in_progress(starget) = 0;
245 spi_initial_dv(starget) = 0;
246 mutex_init(&spi_dv_mutex(starget));
247
248 return 0;
249 }
250
251 #define spi_transport_show_simple(field, format_string) \
252 \
253 static ssize_t \
254 show_spi_transport_##field(struct class_device *cdev, char *buf) \
255 { \
256 struct scsi_target *starget = transport_class_to_starget(cdev); \
257 struct spi_transport_attrs *tp; \
258 \
259 tp = (struct spi_transport_attrs *)&starget->starget_data; \
260 return snprintf(buf, 20, format_string, tp->field); \
261 }
262
263 #define spi_transport_store_simple(field, format_string) \
264 \
265 static ssize_t \
266 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
267 size_t count) \
268 { \
269 int val; \
270 struct scsi_target *starget = transport_class_to_starget(cdev); \
271 struct spi_transport_attrs *tp; \
272 \
273 tp = (struct spi_transport_attrs *)&starget->starget_data; \
274 val = simple_strtoul(buf, NULL, 0); \
275 tp->field = val; \
276 return count; \
277 }
278
279 #define spi_transport_show_function(field, format_string) \
280 \
281 static ssize_t \
282 show_spi_transport_##field(struct class_device *cdev, char *buf) \
283 { \
284 struct scsi_target *starget = transport_class_to_starget(cdev); \
285 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
286 struct spi_transport_attrs *tp; \
287 struct spi_internal *i = to_spi_internal(shost->transportt); \
288 tp = (struct spi_transport_attrs *)&starget->starget_data; \
289 if (i->f->get_##field) \
290 i->f->get_##field(starget); \
291 return snprintf(buf, 20, format_string, tp->field); \
292 }
293
294 #define spi_transport_store_function(field, format_string) \
295 static ssize_t \
296 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
297 size_t count) \
298 { \
299 int val; \
300 struct scsi_target *starget = transport_class_to_starget(cdev); \
301 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
302 struct spi_internal *i = to_spi_internal(shost->transportt); \
303 \
304 val = simple_strtoul(buf, NULL, 0); \
305 i->f->set_##field(starget, val); \
306 return count; \
307 }
308
309 #define spi_transport_store_max(field, format_string) \
310 static ssize_t \
311 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
312 size_t count) \
313 { \
314 int val; \
315 struct scsi_target *starget = transport_class_to_starget(cdev); \
316 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
317 struct spi_internal *i = to_spi_internal(shost->transportt); \
318 struct spi_transport_attrs *tp \
319 = (struct spi_transport_attrs *)&starget->starget_data; \
320 \
321 val = simple_strtoul(buf, NULL, 0); \
322 if (val > tp->max_##field) \
323 val = tp->max_##field; \
324 i->f->set_##field(starget, val); \
325 return count; \
326 }
327
328 #define spi_transport_rd_attr(field, format_string) \
329 spi_transport_show_function(field, format_string) \
330 spi_transport_store_function(field, format_string) \
331 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
332 show_spi_transport_##field, \
333 store_spi_transport_##field);
334
335 #define spi_transport_simple_attr(field, format_string) \
336 spi_transport_show_simple(field, format_string) \
337 spi_transport_store_simple(field, format_string) \
338 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
339 show_spi_transport_##field, \
340 store_spi_transport_##field);
341
342 #define spi_transport_max_attr(field, format_string) \
343 spi_transport_show_function(field, format_string) \
344 spi_transport_store_max(field, format_string) \
345 spi_transport_simple_attr(max_##field, format_string) \
346 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \
347 show_spi_transport_##field, \
348 store_spi_transport_##field);
349
350 /* The Parallel SCSI Tranport Attributes: */
351 spi_transport_max_attr(offset, "%d\n");
352 spi_transport_max_attr(width, "%d\n");
353 spi_transport_rd_attr(iu, "%d\n");
354 spi_transport_rd_attr(dt, "%d\n");
355 spi_transport_rd_attr(qas, "%d\n");
356 spi_transport_rd_attr(wr_flow, "%d\n");
357 spi_transport_rd_attr(rd_strm, "%d\n");
358 spi_transport_rd_attr(rti, "%d\n");
359 spi_transport_rd_attr(pcomp_en, "%d\n");
360 spi_transport_rd_attr(hold_mcs, "%d\n");
361
362 /* we only care about the first child device so we return 1 */
363 static int child_iter(struct device *dev, void *data)
364 {
365 struct scsi_device *sdev = to_scsi_device(dev);
366
367 spi_dv_device(sdev);
368 return 1;
369 }
370
371 static ssize_t
372 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
373 {
374 struct scsi_target *starget = transport_class_to_starget(cdev);
375
376 device_for_each_child(&starget->dev, NULL, child_iter);
377 return count;
378 }
379 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
380
381 /* Translate the period into ns according to the current spec
382 * for SDTR/PPR messages */
383 static int period_to_str(char *buf, int period)
384 {
385 int len, picosec;
386
387 if (period < 0 || period > 0xff) {
388 picosec = -1;
389 } else if (period <= SPI_STATIC_PPR) {
390 picosec = ppr_to_ps[period];
391 } else {
392 picosec = period * 4000;
393 }
394
395 if (picosec == -1) {
396 len = sprintf(buf, "reserved");
397 } else {
398 len = sprint_frac(buf, picosec, 1000);
399 }
400
401 return len;
402 }
403
404 static ssize_t
405 show_spi_transport_period_helper(char *buf, int period)
406 {
407 int len = period_to_str(buf, period);
408 buf[len++] = '\n';
409 buf[len] = '\0';
410 return len;
411 }
412
413 static ssize_t
414 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
415 size_t count, int *periodp)
416 {
417 int j, picosec, period = -1;
418 char *endp;
419
420 picosec = simple_strtoul(buf, &endp, 10) * 1000;
421 if (*endp == '.') {
422 int mult = 100;
423 do {
424 endp++;
425 if (!isdigit(*endp))
426 break;
427 picosec += (*endp - '0') * mult;
428 mult /= 10;
429 } while (mult > 0);
430 }
431
432 for (j = 0; j <= SPI_STATIC_PPR; j++) {
433 if (ppr_to_ps[j] < picosec)
434 continue;
435 period = j;
436 break;
437 }
438
439 if (period == -1)
440 period = picosec / 4000;
441
442 if (period > 0xff)
443 period = 0xff;
444
445 *periodp = period;
446
447 return count;
448 }
449
450 static ssize_t
451 show_spi_transport_period(struct class_device *cdev, char *buf)
452 {
453 struct scsi_target *starget = transport_class_to_starget(cdev);
454 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
455 struct spi_internal *i = to_spi_internal(shost->transportt);
456 struct spi_transport_attrs *tp =
457 (struct spi_transport_attrs *)&starget->starget_data;
458
459 if (i->f->get_period)
460 i->f->get_period(starget);
461
462 return show_spi_transport_period_helper(buf, tp->period);
463 }
464
465 static ssize_t
466 store_spi_transport_period(struct class_device *cdev, const char *buf,
467 size_t count)
468 {
469 struct scsi_target *starget = transport_class_to_starget(cdev);
470 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
471 struct spi_internal *i = to_spi_internal(shost->transportt);
472 struct spi_transport_attrs *tp =
473 (struct spi_transport_attrs *)&starget->starget_data;
474 int period, retval;
475
476 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
477
478 if (period < tp->min_period)
479 period = tp->min_period;
480
481 i->f->set_period(starget, period);
482
483 return retval;
484 }
485
486 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
487 show_spi_transport_period,
488 store_spi_transport_period);
489
490 static ssize_t
491 show_spi_transport_min_period(struct class_device *cdev, char *buf)
492 {
493 struct scsi_target *starget = transport_class_to_starget(cdev);
494 struct spi_transport_attrs *tp =
495 (struct spi_transport_attrs *)&starget->starget_data;
496
497 return show_spi_transport_period_helper(buf, tp->min_period);
498 }
499
500 static ssize_t
501 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
502 size_t count)
503 {
504 struct scsi_target *starget = transport_class_to_starget(cdev);
505 struct spi_transport_attrs *tp =
506 (struct spi_transport_attrs *)&starget->starget_data;
507
508 return store_spi_transport_period_helper(cdev, buf, count,
509 &tp->min_period);
510 }
511
512
513 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
514 show_spi_transport_min_period,
515 store_spi_transport_min_period);
516
517
518 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
519 {
520 struct Scsi_Host *shost = transport_class_to_shost(cdev);
521 struct spi_internal *i = to_spi_internal(shost->transportt);
522
523 if (i->f->get_signalling)
524 i->f->get_signalling(shost);
525
526 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
527 }
528 static ssize_t store_spi_host_signalling(struct class_device *cdev,
529 const char *buf, size_t count)
530 {
531 struct Scsi_Host *shost = transport_class_to_shost(cdev);
532 struct spi_internal *i = to_spi_internal(shost->transportt);
533 enum spi_signal_type type = spi_signal_to_value(buf);
534
535 if (type != SPI_SIGNAL_UNKNOWN)
536 i->f->set_signalling(shost, type);
537
538 return count;
539 }
540 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
541 show_spi_host_signalling,
542 store_spi_host_signalling);
543
544 #define DV_SET(x, y) \
545 if(i->f->set_##x) \
546 i->f->set_##x(sdev->sdev_target, y)
547
548 enum spi_compare_returns {
549 SPI_COMPARE_SUCCESS,
550 SPI_COMPARE_FAILURE,
551 SPI_COMPARE_SKIP_TEST,
552 };
553
554
555 /* This is for read/write Domain Validation: If the device supports
556 * an echo buffer, we do read/write tests to it */
557 static enum spi_compare_returns
558 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
559 u8 *ptr, const int retries)
560 {
561 int len = ptr - buffer;
562 int j, k, r, result;
563 unsigned int pattern = 0x0000ffff;
564 struct scsi_sense_hdr sshdr;
565
566 const char spi_write_buffer[] = {
567 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
568 };
569 const char spi_read_buffer[] = {
570 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
571 };
572
573 /* set up the pattern buffer. Doesn't matter if we spill
574 * slightly beyond since that's where the read buffer is */
575 for (j = 0; j < len; ) {
576
577 /* fill the buffer with counting (test a) */
578 for ( ; j < min(len, 32); j++)
579 buffer[j] = j;
580 k = j;
581 /* fill the buffer with alternating words of 0x0 and
582 * 0xffff (test b) */
583 for ( ; j < min(len, k + 32); j += 2) {
584 u16 *word = (u16 *)&buffer[j];
585
586 *word = (j & 0x02) ? 0x0000 : 0xffff;
587 }
588 k = j;
589 /* fill with crosstalk (alternating 0x5555 0xaaa)
590 * (test c) */
591 for ( ; j < min(len, k + 32); j += 2) {
592 u16 *word = (u16 *)&buffer[j];
593
594 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
595 }
596 k = j;
597 /* fill with shifting bits (test d) */
598 for ( ; j < min(len, k + 32); j += 4) {
599 u32 *word = (unsigned int *)&buffer[j];
600 u32 roll = (pattern & 0x80000000) ? 1 : 0;
601
602 *word = pattern;
603 pattern = (pattern << 1) | roll;
604 }
605 /* don't bother with random data (test e) */
606 }
607
608 for (r = 0; r < retries; r++) {
609 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
610 buffer, len, &sshdr);
611 if(result || !scsi_device_online(sdev)) {
612
613 scsi_device_set_state(sdev, SDEV_QUIESCE);
614 if (scsi_sense_valid(&sshdr)
615 && sshdr.sense_key == ILLEGAL_REQUEST
616 /* INVALID FIELD IN CDB */
617 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
618 /* This would mean that the drive lied
619 * to us about supporting an echo
620 * buffer (unfortunately some Western
621 * Digital drives do precisely this)
622 */
623 return SPI_COMPARE_SKIP_TEST;
624
625
626 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
627 return SPI_COMPARE_FAILURE;
628 }
629
630 memset(ptr, 0, len);
631 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
632 ptr, len, NULL);
633 scsi_device_set_state(sdev, SDEV_QUIESCE);
634
635 if (memcmp(buffer, ptr, len) != 0)
636 return SPI_COMPARE_FAILURE;
637 }
638 return SPI_COMPARE_SUCCESS;
639 }
640
641 /* This is for the simplest form of Domain Validation: a read test
642 * on the inquiry data from the device */
643 static enum spi_compare_returns
644 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
645 u8 *ptr, const int retries)
646 {
647 int r, result;
648 const int len = sdev->inquiry_len;
649 const char spi_inquiry[] = {
650 INQUIRY, 0, 0, 0, len, 0
651 };
652
653 for (r = 0; r < retries; r++) {
654 memset(ptr, 0, len);
655
656 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
657 ptr, len, NULL);
658
659 if(result || !scsi_device_online(sdev)) {
660 scsi_device_set_state(sdev, SDEV_QUIESCE);
661 return SPI_COMPARE_FAILURE;
662 }
663
664 /* If we don't have the inquiry data already, the
665 * first read gets it */
666 if (ptr == buffer) {
667 ptr += len;
668 --r;
669 continue;
670 }
671
672 if (memcmp(buffer, ptr, len) != 0)
673 /* failure */
674 return SPI_COMPARE_FAILURE;
675 }
676 return SPI_COMPARE_SUCCESS;
677 }
678
679 static enum spi_compare_returns
680 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
681 enum spi_compare_returns
682 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
683 {
684 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
685 struct scsi_target *starget = sdev->sdev_target;
686 int period = 0, prevperiod = 0;
687 enum spi_compare_returns retval;
688
689
690 for (;;) {
691 int newperiod;
692 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
693
694 if (retval == SPI_COMPARE_SUCCESS
695 || retval == SPI_COMPARE_SKIP_TEST)
696 break;
697
698 /* OK, retrain, fallback */
699 if (i->f->get_iu)
700 i->f->get_iu(starget);
701 if (i->f->get_qas)
702 i->f->get_qas(starget);
703 if (i->f->get_period)
704 i->f->get_period(sdev->sdev_target);
705
706 /* Here's the fallback sequence; first try turning off
707 * IU, then QAS (if we can control them), then finally
708 * fall down the periods */
709 if (i->f->set_iu && spi_iu(starget)) {
710 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
711 DV_SET(iu, 0);
712 } else if (i->f->set_qas && spi_qas(starget)) {
713 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
714 DV_SET(qas, 0);
715 } else {
716 newperiod = spi_period(starget);
717 period = newperiod > period ? newperiod : period;
718 if (period < 0x0d)
719 period++;
720 else
721 period += period >> 1;
722
723 if (unlikely(period > 0xff || period == prevperiod)) {
724 /* Total failure; set to async and return */
725 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
726 DV_SET(offset, 0);
727 return SPI_COMPARE_FAILURE;
728 }
729 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
730 DV_SET(period, period);
731 prevperiod = period;
732 }
733 }
734 return retval;
735 }
736
737 static int
738 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
739 {
740 int l, result;
741
742 /* first off do a test unit ready. This can error out
743 * because of reservations or some other reason. If it
744 * fails, the device won't let us write to the echo buffer
745 * so just return failure */
746
747 const char spi_test_unit_ready[] = {
748 TEST_UNIT_READY, 0, 0, 0, 0, 0
749 };
750
751 const char spi_read_buffer_descriptor[] = {
752 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
753 };
754
755
756 /* We send a set of three TURs to clear any outstanding
757 * unit attention conditions if they exist (Otherwise the
758 * buffer tests won't be happy). If the TUR still fails
759 * (reservation conflict, device not ready, etc) just
760 * skip the write tests */
761 for (l = 0; ; l++) {
762 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
763 NULL, 0, NULL);
764
765 if(result) {
766 if(l >= 3)
767 return 0;
768 } else {
769 /* TUR succeeded */
770 break;
771 }
772 }
773
774 result = spi_execute(sdev, spi_read_buffer_descriptor,
775 DMA_FROM_DEVICE, buffer, 4, NULL);
776
777 if (result)
778 /* Device has no echo buffer */
779 return 0;
780
781 return buffer[3] + ((buffer[2] & 0x1f) << 8);
782 }
783
784 static void
785 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
786 {
787 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
788 struct scsi_target *starget = sdev->sdev_target;
789 struct Scsi_Host *shost = sdev->host;
790 int len = sdev->inquiry_len;
791 /* first set us up for narrow async */
792 DV_SET(offset, 0);
793 DV_SET(width, 0);
794
795 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
796 != SPI_COMPARE_SUCCESS) {
797 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
798 /* FIXME: should probably offline the device here? */
799 return;
800 }
801
802 /* test width */
803 if (i->f->set_width && spi_max_width(starget) &&
804 scsi_device_wide(sdev)) {
805 i->f->set_width(starget, 1);
806
807 if (spi_dv_device_compare_inquiry(sdev, buffer,
808 buffer + len,
809 DV_LOOPS)
810 != SPI_COMPARE_SUCCESS) {
811 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
812 i->f->set_width(starget, 0);
813 }
814 }
815
816 if (!i->f->set_period)
817 return;
818
819 /* device can't handle synchronous */
820 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
821 return;
822
823 /* len == -1 is the signal that we need to ascertain the
824 * presence of an echo buffer before trying to use it. len ==
825 * 0 means we don't have an echo buffer */
826 len = -1;
827
828 retry:
829
830 /* now set up to the maximum */
831 DV_SET(offset, spi_max_offset(starget));
832 DV_SET(period, spi_min_period(starget));
833 /* try QAS requests; this should be harmless to set if the
834 * target supports it */
835 if (scsi_device_qas(sdev)) {
836 DV_SET(qas, 1);
837 } else {
838 DV_SET(qas, 0);
839 }
840
841 if (scsi_device_ius(sdev) && spi_min_period(starget) < 9) {
842 /* This u320 (or u640). Set IU transfers */
843 DV_SET(iu, 1);
844 /* Then set the optional parameters */
845 DV_SET(rd_strm, 1);
846 DV_SET(wr_flow, 1);
847 DV_SET(rti, 1);
848 if (spi_min_period(starget) == 8)
849 DV_SET(pcomp_en, 1);
850 } else {
851 DV_SET(iu, 0);
852 }
853
854 /* now that we've done all this, actually check the bus
855 * signal type (if known). Some devices are stupid on
856 * a SE bus and still claim they can try LVD only settings */
857 if (i->f->get_signalling)
858 i->f->get_signalling(shost);
859 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
860 spi_signalling(shost) == SPI_SIGNAL_HVD ||
861 !scsi_device_dt(sdev)) {
862 DV_SET(dt, 0);
863 } else {
864 DV_SET(dt, 1);
865 }
866 /* Do the read only INQUIRY tests */
867 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
868 spi_dv_device_compare_inquiry);
869 /* See if we actually managed to negotiate and sustain DT */
870 if (i->f->get_dt)
871 i->f->get_dt(starget);
872
873 /* see if the device has an echo buffer. If it does we can do
874 * the SPI pattern write tests. Because of some broken
875 * devices, we *only* try this on a device that has actually
876 * negotiated DT */
877
878 if (len == -1 && spi_dt(starget))
879 len = spi_dv_device_get_echo_buffer(sdev, buffer);
880
881 if (len <= 0) {
882 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
883 return;
884 }
885
886 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
887 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
888 len = SPI_MAX_ECHO_BUFFER_SIZE;
889 }
890
891 if (spi_dv_retrain(sdev, buffer, buffer + len,
892 spi_dv_device_echo_buffer)
893 == SPI_COMPARE_SKIP_TEST) {
894 /* OK, the stupid drive can't do a write echo buffer
895 * test after all, fall back to the read tests */
896 len = 0;
897 goto retry;
898 }
899 }
900
901
902 /** spi_dv_device - Do Domain Validation on the device
903 * @sdev: scsi device to validate
904 *
905 * Performs the domain validation on the given device in the
906 * current execution thread. Since DV operations may sleep,
907 * the current thread must have user context. Also no SCSI
908 * related locks that would deadlock I/O issued by the DV may
909 * be held.
910 */
911 void
912 spi_dv_device(struct scsi_device *sdev)
913 {
914 struct scsi_target *starget = sdev->sdev_target;
915 u8 *buffer;
916 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
917
918 if (unlikely(scsi_device_get(sdev)))
919 return;
920
921 if (unlikely(spi_dv_in_progress(starget)))
922 return;
923 spi_dv_in_progress(starget) = 1;
924
925 buffer = kzalloc(len, GFP_KERNEL);
926
927 if (unlikely(!buffer))
928 goto out_put;
929
930 /* We need to verify that the actual device will quiesce; the
931 * later target quiesce is just a nice to have */
932 if (unlikely(scsi_device_quiesce(sdev)))
933 goto out_free;
934
935 scsi_target_quiesce(starget);
936
937 spi_dv_pending(starget) = 1;
938 mutex_lock(&spi_dv_mutex(starget));
939
940 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
941
942 spi_dv_device_internal(sdev, buffer);
943
944 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
945
946 mutex_unlock(&spi_dv_mutex(starget));
947 spi_dv_pending(starget) = 0;
948
949 scsi_target_resume(starget);
950
951 spi_initial_dv(starget) = 1;
952
953 out_free:
954 kfree(buffer);
955 out_put:
956 spi_dv_in_progress(starget) = 0;
957 scsi_device_put(sdev);
958 }
959 EXPORT_SYMBOL(spi_dv_device);
960
961 struct work_queue_wrapper {
962 struct work_struct work;
963 struct scsi_device *sdev;
964 };
965
966 static void
967 spi_dv_device_work_wrapper(struct work_struct *work)
968 {
969 struct work_queue_wrapper *wqw =
970 container_of(work, struct work_queue_wrapper, work);
971 struct scsi_device *sdev = wqw->sdev;
972
973 kfree(wqw);
974 spi_dv_device(sdev);
975 spi_dv_pending(sdev->sdev_target) = 0;
976 scsi_device_put(sdev);
977 }
978
979
980 /**
981 * spi_schedule_dv_device - schedule domain validation to occur on the device
982 * @sdev: The device to validate
983 *
984 * Identical to spi_dv_device() above, except that the DV will be
985 * scheduled to occur in a workqueue later. All memory allocations
986 * are atomic, so may be called from any context including those holding
987 * SCSI locks.
988 */
989 void
990 spi_schedule_dv_device(struct scsi_device *sdev)
991 {
992 struct work_queue_wrapper *wqw =
993 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
994
995 if (unlikely(!wqw))
996 return;
997
998 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
999 kfree(wqw);
1000 return;
1001 }
1002 /* Set pending early (dv_device doesn't check it, only sets it) */
1003 spi_dv_pending(sdev->sdev_target) = 1;
1004 if (unlikely(scsi_device_get(sdev))) {
1005 kfree(wqw);
1006 spi_dv_pending(sdev->sdev_target) = 0;
1007 return;
1008 }
1009
1010 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1011 wqw->sdev = sdev;
1012
1013 schedule_work(&wqw->work);
1014 }
1015 EXPORT_SYMBOL(spi_schedule_dv_device);
1016
1017 /**
1018 * spi_display_xfer_agreement - Print the current target transfer agreement
1019 * @starget: The target for which to display the agreement
1020 *
1021 * Each SPI port is required to maintain a transfer agreement for each
1022 * other port on the bus. This function prints a one-line summary of
1023 * the current agreement; more detailed information is available in sysfs.
1024 */
1025 void spi_display_xfer_agreement(struct scsi_target *starget)
1026 {
1027 struct spi_transport_attrs *tp;
1028 tp = (struct spi_transport_attrs *)&starget->starget_data;
1029
1030 if (tp->offset > 0 && tp->period > 0) {
1031 unsigned int picosec, kb100;
1032 char *scsi = "FAST-?";
1033 char tmp[8];
1034
1035 if (tp->period <= SPI_STATIC_PPR) {
1036 picosec = ppr_to_ps[tp->period];
1037 switch (tp->period) {
1038 case 7: scsi = "FAST-320"; break;
1039 case 8: scsi = "FAST-160"; break;
1040 case 9: scsi = "FAST-80"; break;
1041 case 10:
1042 case 11: scsi = "FAST-40"; break;
1043 case 12: scsi = "FAST-20"; break;
1044 }
1045 } else {
1046 picosec = tp->period * 4000;
1047 if (tp->period < 25)
1048 scsi = "FAST-20";
1049 else if (tp->period < 50)
1050 scsi = "FAST-10";
1051 else
1052 scsi = "FAST-5";
1053 }
1054
1055 kb100 = (10000000 + picosec / 2) / picosec;
1056 if (tp->width)
1057 kb100 *= 2;
1058 sprint_frac(tmp, picosec, 1000);
1059
1060 dev_info(&starget->dev,
1061 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1062 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1063 tp->dt ? "DT" : "ST",
1064 tp->iu ? " IU" : "",
1065 tp->qas ? " QAS" : "",
1066 tp->rd_strm ? " RDSTRM" : "",
1067 tp->rti ? " RTI" : "",
1068 tp->wr_flow ? " WRFLOW" : "",
1069 tp->pcomp_en ? " PCOMP" : "",
1070 tp->hold_mcs ? " HMCS" : "",
1071 tmp, tp->offset);
1072 } else {
1073 dev_info(&starget->dev, "%sasynchronous\n",
1074 tp->width ? "wide " : "");
1075 }
1076 }
1077 EXPORT_SYMBOL(spi_display_xfer_agreement);
1078
1079 int spi_populate_width_msg(unsigned char *msg, int width)
1080 {
1081 msg[0] = EXTENDED_MESSAGE;
1082 msg[1] = 2;
1083 msg[2] = EXTENDED_WDTR;
1084 msg[3] = width;
1085 return 4;
1086 }
1087 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1088
1089 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1090 {
1091 msg[0] = EXTENDED_MESSAGE;
1092 msg[1] = 3;
1093 msg[2] = EXTENDED_SDTR;
1094 msg[3] = period;
1095 msg[4] = offset;
1096 return 5;
1097 }
1098 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1099
1100 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1101 int width, int options)
1102 {
1103 msg[0] = EXTENDED_MESSAGE;
1104 msg[1] = 6;
1105 msg[2] = EXTENDED_PPR;
1106 msg[3] = period;
1107 msg[4] = 0;
1108 msg[5] = offset;
1109 msg[6] = width;
1110 msg[7] = options;
1111 return 8;
1112 }
1113 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1114
1115 #ifdef CONFIG_SCSI_CONSTANTS
1116 static const char * const one_byte_msgs[] = {
1117 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1118 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1119 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1120 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1121 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1122 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1123 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1124 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1125 };
1126
1127 static const char * const two_byte_msgs[] = {
1128 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1129 /* 0x23 */ "Ignore Wide Residue", "ACA"
1130 };
1131
1132 static const char * const extended_msgs[] = {
1133 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1134 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1135 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1136 };
1137
1138 static void print_nego(const unsigned char *msg, int per, int off, int width)
1139 {
1140 if (per) {
1141 char buf[20];
1142 period_to_str(buf, msg[per]);
1143 printk("period = %s ns ", buf);
1144 }
1145
1146 if (off)
1147 printk("offset = %d ", msg[off]);
1148 if (width)
1149 printk("width = %d ", 8 << msg[width]);
1150 }
1151
1152 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1153 {
1154 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1155 msg[msb+3];
1156 printk("%s = %d ", desc, ptr);
1157 }
1158
1159 int spi_print_msg(const unsigned char *msg)
1160 {
1161 int len = 1, i;
1162 if (msg[0] == EXTENDED_MESSAGE) {
1163 len = 2 + msg[1];
1164 if (len == 2)
1165 len += 256;
1166 if (msg[2] < ARRAY_SIZE(extended_msgs))
1167 printk ("%s ", extended_msgs[msg[2]]);
1168 else
1169 printk ("Extended Message, reserved code (0x%02x) ",
1170 (int) msg[2]);
1171 switch (msg[2]) {
1172 case EXTENDED_MODIFY_DATA_POINTER:
1173 print_ptr(msg, 3, "pointer");
1174 break;
1175 case EXTENDED_SDTR:
1176 print_nego(msg, 3, 4, 0);
1177 break;
1178 case EXTENDED_WDTR:
1179 print_nego(msg, 0, 0, 3);
1180 break;
1181 case EXTENDED_PPR:
1182 print_nego(msg, 3, 5, 6);
1183 break;
1184 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1185 print_ptr(msg, 3, "out");
1186 print_ptr(msg, 7, "in");
1187 break;
1188 default:
1189 for (i = 2; i < len; ++i)
1190 printk("%02x ", msg[i]);
1191 }
1192 /* Identify */
1193 } else if (msg[0] & 0x80) {
1194 printk("Identify disconnect %sallowed %s %d ",
1195 (msg[0] & 0x40) ? "" : "not ",
1196 (msg[0] & 0x20) ? "target routine" : "lun",
1197 msg[0] & 0x7);
1198 /* Normal One byte */
1199 } else if (msg[0] < 0x1f) {
1200 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1201 printk("%s ", one_byte_msgs[msg[0]]);
1202 else
1203 printk("reserved (%02x) ", msg[0]);
1204 } else if (msg[0] == 0x55) {
1205 printk("QAS Request ");
1206 /* Two byte */
1207 } else if (msg[0] <= 0x2f) {
1208 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1209 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1210 msg[1]);
1211 else
1212 printk("reserved two byte (%02x %02x) ",
1213 msg[0], msg[1]);
1214 len = 2;
1215 } else
1216 printk("reserved ");
1217 return len;
1218 }
1219 EXPORT_SYMBOL(spi_print_msg);
1220
1221 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1222
1223 int spi_print_msg(const unsigned char *msg)
1224 {
1225 int len = 1, i;
1226
1227 if (msg[0] == EXTENDED_MESSAGE) {
1228 len = 2 + msg[1];
1229 if (len == 2)
1230 len += 256;
1231 for (i = 0; i < len; ++i)
1232 printk("%02x ", msg[i]);
1233 /* Identify */
1234 } else if (msg[0] & 0x80) {
1235 printk("%02x ", msg[0]);
1236 /* Normal One byte */
1237 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1238 printk("%02x ", msg[0]);
1239 /* Two byte */
1240 } else if (msg[0] <= 0x2f) {
1241 printk("%02x %02x", msg[0], msg[1]);
1242 len = 2;
1243 } else
1244 printk("%02x ", msg[0]);
1245 return len;
1246 }
1247 EXPORT_SYMBOL(spi_print_msg);
1248 #endif /* ! CONFIG_SCSI_CONSTANTS */
1249
1250 #define SETUP_ATTRIBUTE(field) \
1251 i->private_attrs[count] = class_device_attr_##field; \
1252 if (!i->f->set_##field) { \
1253 i->private_attrs[count].attr.mode = S_IRUGO; \
1254 i->private_attrs[count].store = NULL; \
1255 } \
1256 i->attrs[count] = &i->private_attrs[count]; \
1257 if (i->f->show_##field) \
1258 count++
1259
1260 #define SETUP_RELATED_ATTRIBUTE(field, rel_field) \
1261 i->private_attrs[count] = class_device_attr_##field; \
1262 if (!i->f->set_##rel_field) { \
1263 i->private_attrs[count].attr.mode = S_IRUGO; \
1264 i->private_attrs[count].store = NULL; \
1265 } \
1266 i->attrs[count] = &i->private_attrs[count]; \
1267 if (i->f->show_##rel_field) \
1268 count++
1269
1270 #define SETUP_HOST_ATTRIBUTE(field) \
1271 i->private_host_attrs[count] = class_device_attr_##field; \
1272 if (!i->f->set_##field) { \
1273 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1274 i->private_host_attrs[count].store = NULL; \
1275 } \
1276 i->host_attrs[count] = &i->private_host_attrs[count]; \
1277 count++
1278
1279 static int spi_device_match(struct attribute_container *cont,
1280 struct device *dev)
1281 {
1282 struct scsi_device *sdev;
1283 struct Scsi_Host *shost;
1284 struct spi_internal *i;
1285
1286 if (!scsi_is_sdev_device(dev))
1287 return 0;
1288
1289 sdev = to_scsi_device(dev);
1290 shost = sdev->host;
1291 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1292 != &spi_host_class.class)
1293 return 0;
1294 /* Note: this class has no device attributes, so it has
1295 * no per-HBA allocation and thus we don't need to distinguish
1296 * the attribute containers for the device */
1297 i = to_spi_internal(shost->transportt);
1298 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1299 return 0;
1300 return 1;
1301 }
1302
1303 static int spi_target_match(struct attribute_container *cont,
1304 struct device *dev)
1305 {
1306 struct Scsi_Host *shost;
1307 struct scsi_target *starget;
1308 struct spi_internal *i;
1309
1310 if (!scsi_is_target_device(dev))
1311 return 0;
1312
1313 shost = dev_to_shost(dev->parent);
1314 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1315 != &spi_host_class.class)
1316 return 0;
1317
1318 i = to_spi_internal(shost->transportt);
1319 starget = to_scsi_target(dev);
1320
1321 if (i->f->deny_binding && i->f->deny_binding(starget))
1322 return 0;
1323
1324 return &i->t.target_attrs.ac == cont;
1325 }
1326
1327 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1328 "spi_transport",
1329 spi_setup_transport_attrs,
1330 NULL,
1331 NULL);
1332
1333 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1334 spi_device_match,
1335 spi_device_configure);
1336
1337 struct scsi_transport_template *
1338 spi_attach_transport(struct spi_function_template *ft)
1339 {
1340 int count = 0;
1341 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1342 GFP_KERNEL);
1343
1344 if (unlikely(!i))
1345 return NULL;
1346
1347 i->t.target_attrs.ac.class = &spi_transport_class.class;
1348 i->t.target_attrs.ac.attrs = &i->attrs[0];
1349 i->t.target_attrs.ac.match = spi_target_match;
1350 transport_container_register(&i->t.target_attrs);
1351 i->t.target_size = sizeof(struct spi_transport_attrs);
1352 i->t.host_attrs.ac.class = &spi_host_class.class;
1353 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1354 i->t.host_attrs.ac.match = spi_host_match;
1355 transport_container_register(&i->t.host_attrs);
1356 i->t.host_size = sizeof(struct spi_host_attrs);
1357 i->f = ft;
1358
1359 SETUP_ATTRIBUTE(period);
1360 SETUP_RELATED_ATTRIBUTE(min_period, period);
1361 SETUP_ATTRIBUTE(offset);
1362 SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1363 SETUP_ATTRIBUTE(width);
1364 SETUP_RELATED_ATTRIBUTE(max_width, width);
1365 SETUP_ATTRIBUTE(iu);
1366 SETUP_ATTRIBUTE(dt);
1367 SETUP_ATTRIBUTE(qas);
1368 SETUP_ATTRIBUTE(wr_flow);
1369 SETUP_ATTRIBUTE(rd_strm);
1370 SETUP_ATTRIBUTE(rti);
1371 SETUP_ATTRIBUTE(pcomp_en);
1372 SETUP_ATTRIBUTE(hold_mcs);
1373
1374 /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1375 * this bug will trigger */
1376 BUG_ON(count > SPI_NUM_ATTRS);
1377
1378 i->attrs[count++] = &class_device_attr_revalidate;
1379
1380 i->attrs[count] = NULL;
1381
1382 count = 0;
1383 SETUP_HOST_ATTRIBUTE(signalling);
1384
1385 BUG_ON(count > SPI_HOST_ATTRS);
1386
1387 i->host_attrs[count] = NULL;
1388
1389 return &i->t;
1390 }
1391 EXPORT_SYMBOL(spi_attach_transport);
1392
1393 void spi_release_transport(struct scsi_transport_template *t)
1394 {
1395 struct spi_internal *i = to_spi_internal(t);
1396
1397 transport_container_unregister(&i->t.target_attrs);
1398 transport_container_unregister(&i->t.host_attrs);
1399
1400 kfree(i);
1401 }
1402 EXPORT_SYMBOL(spi_release_transport);
1403
1404 static __init int spi_transport_init(void)
1405 {
1406 int error = transport_class_register(&spi_transport_class);
1407 if (error)
1408 return error;
1409 error = anon_transport_class_register(&spi_device_class);
1410 return transport_class_register(&spi_host_class);
1411 }
1412
1413 static void __exit spi_transport_exit(void)
1414 {
1415 transport_class_unregister(&spi_transport_class);
1416 anon_transport_class_unregister(&spi_device_class);
1417 transport_class_unregister(&spi_host_class);
1418 }
1419
1420 MODULE_AUTHOR("Martin Hicks");
1421 MODULE_DESCRIPTION("SPI Transport Attributes");
1422 MODULE_LICENSE("GPL");
1423
1424 module_init(spi_transport_init);
1425 module_exit(spi_transport_exit);
Linux kernel - Deliverables
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