[SCSI] Fix printing of two-byte messages
[linux-2.6.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/config.h>
22 #include <linux/ctype.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/workqueue.h>
26 #include <linux/blkdev.h>
27 #include <asm/semaphore.h>
28 #include <scsi/scsi.h>
29 #include "scsi_priv.h"
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_spi.h>
36
37 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
38 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
39                                  * on" attributes */
40 #define SPI_HOST_ATTRS  1
41
42 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
43
44 #define DV_LOOPS        3
45 #define DV_TIMEOUT      (10*HZ)
46 #define DV_RETRIES      3       /* should only need at most 
47                                  * two cc/ua clears */
48
49 /* Private data accessors (keep these out of the header file) */
50 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
51 #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
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, sizeof(*sense),
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 < sizeof(signal_types)/sizeof(signal_types[0]); 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 < sizeof(signal_types)/sizeof(signal_types[0]); 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_initial_dv(starget) = 0;
245         init_MUTEX(&spi_dv_sem(starget));
246
247         return 0;
248 }
249
250 #define spi_transport_show_simple(field, format_string)                 \
251                                                                         \
252 static ssize_t                                                          \
253 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
254 {                                                                       \
255         struct scsi_target *starget = transport_class_to_starget(cdev); \
256         struct spi_transport_attrs *tp;                                 \
257                                                                         \
258         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
259         return snprintf(buf, 20, format_string, tp->field);             \
260 }
261
262 #define spi_transport_store_simple(field, format_string)                \
263                                                                         \
264 static ssize_t                                                          \
265 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
266                             size_t count)                               \
267 {                                                                       \
268         int val;                                                        \
269         struct scsi_target *starget = transport_class_to_starget(cdev); \
270         struct spi_transport_attrs *tp;                                 \
271                                                                         \
272         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
273         val = simple_strtoul(buf, NULL, 0);                             \
274         tp->field = val;                                                \
275         return count;                                                   \
276 }
277
278 #define spi_transport_show_function(field, format_string)               \
279                                                                         \
280 static ssize_t                                                          \
281 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
282 {                                                                       \
283         struct scsi_target *starget = transport_class_to_starget(cdev); \
284         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
285         struct spi_transport_attrs *tp;                                 \
286         struct spi_internal *i = to_spi_internal(shost->transportt);    \
287         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
288         if (i->f->get_##field)                                          \
289                 i->f->get_##field(starget);                             \
290         return snprintf(buf, 20, format_string, tp->field);             \
291 }
292
293 #define spi_transport_store_function(field, format_string)              \
294 static ssize_t                                                          \
295 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
296                             size_t count)                               \
297 {                                                                       \
298         int val;                                                        \
299         struct scsi_target *starget = transport_class_to_starget(cdev); \
300         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
301         struct spi_internal *i = to_spi_internal(shost->transportt);    \
302                                                                         \
303         val = simple_strtoul(buf, NULL, 0);                             \
304         i->f->set_##field(starget, val);                        \
305         return count;                                                   \
306 }
307
308 #define spi_transport_store_max(field, format_string)                   \
309 static ssize_t                                                          \
310 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
311                             size_t count)                               \
312 {                                                                       \
313         int val;                                                        \
314         struct scsi_target *starget = transport_class_to_starget(cdev); \
315         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
316         struct spi_internal *i = to_spi_internal(shost->transportt);    \
317         struct spi_transport_attrs *tp                                  \
318                 = (struct spi_transport_attrs *)&starget->starget_data; \
319                                                                         \
320         val = simple_strtoul(buf, NULL, 0);                             \
321         if (val > tp->max_##field)                                      \
322                 val = tp->max_##field;                                  \
323         i->f->set_##field(starget, val);                                \
324         return count;                                                   \
325 }
326
327 #define spi_transport_rd_attr(field, format_string)                     \
328         spi_transport_show_function(field, format_string)               \
329         spi_transport_store_function(field, format_string)              \
330 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
331                          show_spi_transport_##field,                    \
332                          store_spi_transport_##field);
333
334 #define spi_transport_simple_attr(field, format_string)                 \
335         spi_transport_show_simple(field, format_string)                 \
336         spi_transport_store_simple(field, format_string)                \
337 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
338                          show_spi_transport_##field,                    \
339                          store_spi_transport_##field);
340
341 #define spi_transport_max_attr(field, format_string)                    \
342         spi_transport_show_function(field, format_string)               \
343         spi_transport_store_max(field, format_string)                   \
344         spi_transport_simple_attr(max_##field, format_string)           \
345 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
346                          show_spi_transport_##field,                    \
347                          store_spi_transport_##field);
348
349 /* The Parallel SCSI Tranport Attributes: */
350 spi_transport_max_attr(offset, "%d\n");
351 spi_transport_max_attr(width, "%d\n");
352 spi_transport_rd_attr(iu, "%d\n");
353 spi_transport_rd_attr(dt, "%d\n");
354 spi_transport_rd_attr(qas, "%d\n");
355 spi_transport_rd_attr(wr_flow, "%d\n");
356 spi_transport_rd_attr(rd_strm, "%d\n");
357 spi_transport_rd_attr(rti, "%d\n");
358 spi_transport_rd_attr(pcomp_en, "%d\n");
359 spi_transport_rd_attr(hold_mcs, "%d\n");
360
361 /* we only care about the first child device so we return 1 */
362 static int child_iter(struct device *dev, void *data)
363 {
364         struct scsi_device *sdev = to_scsi_device(dev);
365
366         spi_dv_device(sdev);
367         return 1;
368 }
369
370 static ssize_t
371 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
372 {
373         struct scsi_target *starget = transport_class_to_starget(cdev);
374
375         device_for_each_child(&starget->dev, NULL, child_iter);
376         return count;
377 }
378 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
379
380 /* Translate the period into ns according to the current spec
381  * for SDTR/PPR messages */
382 static ssize_t
383 show_spi_transport_period_helper(struct class_device *cdev, char *buf,
384                                  int period)
385 {
386         int len, picosec;
387
388         if (period < 0 || period > 0xff) {
389                 picosec = -1;
390         } else if (period <= SPI_STATIC_PPR) {
391                 picosec = ppr_to_ps[period];
392         } else {
393                 picosec = period * 4000;
394         }
395
396         if (picosec == -1) {
397                 len = sprintf(buf, "reserved");
398         } else {
399                 len = sprint_frac(buf, picosec, 1000);
400         }
401
402         buf[len++] = '\n';
403         buf[len] = '\0';
404         return len;
405 }
406
407 static ssize_t
408 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
409                                   size_t count, int *periodp)
410 {
411         int j, picosec, period = -1;
412         char *endp;
413
414         picosec = simple_strtoul(buf, &endp, 10) * 1000;
415         if (*endp == '.') {
416                 int mult = 100;
417                 do {
418                         endp++;
419                         if (!isdigit(*endp))
420                                 break;
421                         picosec += (*endp - '0') * mult;
422                         mult /= 10;
423                 } while (mult > 0);
424         }
425
426         for (j = 0; j <= SPI_STATIC_PPR; j++) {
427                 if (ppr_to_ps[j] < picosec)
428                         continue;
429                 period = j;
430                 break;
431         }
432
433         if (period == -1)
434                 period = picosec / 4000;
435
436         if (period > 0xff)
437                 period = 0xff;
438
439         *periodp = period;
440
441         return count;
442 }
443
444 static ssize_t
445 show_spi_transport_period(struct class_device *cdev, char *buf)
446 {
447         struct scsi_target *starget = transport_class_to_starget(cdev);
448         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
449         struct spi_internal *i = to_spi_internal(shost->transportt);
450         struct spi_transport_attrs *tp =
451                 (struct spi_transport_attrs *)&starget->starget_data;
452
453         if (i->f->get_period)
454                 i->f->get_period(starget);
455
456         return show_spi_transport_period_helper(cdev, buf, tp->period);
457 }
458
459 static ssize_t
460 store_spi_transport_period(struct class_device *cdev, const char *buf,
461                             size_t count)
462 {
463         struct scsi_target *starget = transport_class_to_starget(cdev);
464         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
465         struct spi_internal *i = to_spi_internal(shost->transportt);
466         struct spi_transport_attrs *tp =
467                 (struct spi_transport_attrs *)&starget->starget_data;
468         int period, retval;
469
470         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
471
472         if (period < tp->min_period)
473                 period = tp->min_period;
474
475         i->f->set_period(starget, period);
476
477         return retval;
478 }
479
480 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, 
481                          show_spi_transport_period,
482                          store_spi_transport_period);
483
484 static ssize_t
485 show_spi_transport_min_period(struct class_device *cdev, char *buf)
486 {
487         struct scsi_target *starget = transport_class_to_starget(cdev);
488         struct spi_transport_attrs *tp =
489                 (struct spi_transport_attrs *)&starget->starget_data;
490
491         return show_spi_transport_period_helper(cdev, buf, tp->min_period);
492 }
493
494 static ssize_t
495 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
496                             size_t count)
497 {
498         struct scsi_target *starget = transport_class_to_starget(cdev);
499         struct spi_transport_attrs *tp =
500                 (struct spi_transport_attrs *)&starget->starget_data;
501
502         return store_spi_transport_period_helper(cdev, buf, count,
503                                                  &tp->min_period);
504 }
505
506
507 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR, 
508                          show_spi_transport_min_period,
509                          store_spi_transport_min_period);
510
511
512 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
513 {
514         struct Scsi_Host *shost = transport_class_to_shost(cdev);
515         struct spi_internal *i = to_spi_internal(shost->transportt);
516
517         if (i->f->get_signalling)
518                 i->f->get_signalling(shost);
519
520         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
521 }
522 static ssize_t store_spi_host_signalling(struct class_device *cdev,
523                                          const char *buf, size_t count)
524 {
525         struct Scsi_Host *shost = transport_class_to_shost(cdev);
526         struct spi_internal *i = to_spi_internal(shost->transportt);
527         enum spi_signal_type type = spi_signal_to_value(buf);
528
529         if (type != SPI_SIGNAL_UNKNOWN)
530                 i->f->set_signalling(shost, type);
531
532         return count;
533 }
534 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
535                          show_spi_host_signalling,
536                          store_spi_host_signalling);
537
538 #define DV_SET(x, y)                    \
539         if(i->f->set_##x)               \
540                 i->f->set_##x(sdev->sdev_target, y)
541
542 enum spi_compare_returns {
543         SPI_COMPARE_SUCCESS,
544         SPI_COMPARE_FAILURE,
545         SPI_COMPARE_SKIP_TEST,
546 };
547
548
549 /* This is for read/write Domain Validation:  If the device supports
550  * an echo buffer, we do read/write tests to it */
551 static enum spi_compare_returns
552 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
553                           u8 *ptr, const int retries)
554 {
555         int len = ptr - buffer;
556         int j, k, r, result;
557         unsigned int pattern = 0x0000ffff;
558         struct scsi_sense_hdr sshdr;
559
560         const char spi_write_buffer[] = {
561                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
562         };
563         const char spi_read_buffer[] = {
564                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
565         };
566
567         /* set up the pattern buffer.  Doesn't matter if we spill
568          * slightly beyond since that's where the read buffer is */
569         for (j = 0; j < len; ) {
570
571                 /* fill the buffer with counting (test a) */
572                 for ( ; j < min(len, 32); j++)
573                         buffer[j] = j;
574                 k = j;
575                 /* fill the buffer with alternating words of 0x0 and
576                  * 0xffff (test b) */
577                 for ( ; j < min(len, k + 32); j += 2) {
578                         u16 *word = (u16 *)&buffer[j];
579                         
580                         *word = (j & 0x02) ? 0x0000 : 0xffff;
581                 }
582                 k = j;
583                 /* fill with crosstalk (alternating 0x5555 0xaaa)
584                  * (test c) */
585                 for ( ; j < min(len, k + 32); j += 2) {
586                         u16 *word = (u16 *)&buffer[j];
587
588                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
589                 }
590                 k = j;
591                 /* fill with shifting bits (test d) */
592                 for ( ; j < min(len, k + 32); j += 4) {
593                         u32 *word = (unsigned int *)&buffer[j];
594                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
595                         
596                         *word = pattern;
597                         pattern = (pattern << 1) | roll;
598                 }
599                 /* don't bother with random data (test e) */
600         }
601
602         for (r = 0; r < retries; r++) {
603                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
604                                      buffer, len, &sshdr);
605                 if(result || !scsi_device_online(sdev)) {
606
607                         scsi_device_set_state(sdev, SDEV_QUIESCE);
608                         if (scsi_sense_valid(&sshdr)
609                             && sshdr.sense_key == ILLEGAL_REQUEST
610                             /* INVALID FIELD IN CDB */
611                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
612                                 /* This would mean that the drive lied
613                                  * to us about supporting an echo
614                                  * buffer (unfortunately some Western
615                                  * Digital drives do precisely this)
616                                  */
617                                 return SPI_COMPARE_SKIP_TEST;
618
619
620                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
621                         return SPI_COMPARE_FAILURE;
622                 }
623
624                 memset(ptr, 0, len);
625                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
626                             ptr, len, NULL);
627                 scsi_device_set_state(sdev, SDEV_QUIESCE);
628
629                 if (memcmp(buffer, ptr, len) != 0)
630                         return SPI_COMPARE_FAILURE;
631         }
632         return SPI_COMPARE_SUCCESS;
633 }
634
635 /* This is for the simplest form of Domain Validation: a read test
636  * on the inquiry data from the device */
637 static enum spi_compare_returns
638 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
639                               u8 *ptr, const int retries)
640 {
641         int r, result;
642         const int len = sdev->inquiry_len;
643         const char spi_inquiry[] = {
644                 INQUIRY, 0, 0, 0, len, 0
645         };
646
647         for (r = 0; r < retries; r++) {
648                 memset(ptr, 0, len);
649
650                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
651                                      ptr, len, NULL);
652                 
653                 if(result || !scsi_device_online(sdev)) {
654                         scsi_device_set_state(sdev, SDEV_QUIESCE);
655                         return SPI_COMPARE_FAILURE;
656                 }
657
658                 /* If we don't have the inquiry data already, the
659                  * first read gets it */
660                 if (ptr == buffer) {
661                         ptr += len;
662                         --r;
663                         continue;
664                 }
665
666                 if (memcmp(buffer, ptr, len) != 0)
667                         /* failure */
668                         return SPI_COMPARE_FAILURE;
669         }
670         return SPI_COMPARE_SUCCESS;
671 }
672
673 static enum spi_compare_returns
674 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
675                enum spi_compare_returns 
676                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
677 {
678         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
679         struct scsi_target *starget = sdev->sdev_target;
680         int period = 0, prevperiod = 0; 
681         enum spi_compare_returns retval;
682
683
684         for (;;) {
685                 int newperiod;
686                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
687
688                 if (retval == SPI_COMPARE_SUCCESS
689                     || retval == SPI_COMPARE_SKIP_TEST)
690                         break;
691
692                 /* OK, retrain, fallback */
693                 if (i->f->get_iu)
694                         i->f->get_iu(starget);
695                 if (i->f->get_qas)
696                         i->f->get_qas(starget);
697                 if (i->f->get_period)
698                         i->f->get_period(sdev->sdev_target);
699
700                 /* Here's the fallback sequence; first try turning off
701                  * IU, then QAS (if we can control them), then finally
702                  * fall down the periods */
703                 if (i->f->set_iu && spi_iu(starget)) {
704                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
705                         DV_SET(iu, 0);
706                 } else if (i->f->set_qas && spi_qas(starget)) {
707                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
708                         DV_SET(qas, 0);
709                 } else {
710                         newperiod = spi_period(starget);
711                         period = newperiod > period ? newperiod : period;
712                         if (period < 0x0d)
713                                 period++;
714                         else
715                                 period += period >> 1;
716
717                         if (unlikely(period > 0xff || period == prevperiod)) {
718                                 /* Total failure; set to async and return */
719                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
720                                 DV_SET(offset, 0);
721                                 return SPI_COMPARE_FAILURE;
722                         }
723                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
724                         DV_SET(period, period);
725                         prevperiod = period;
726                 }
727         }
728         return retval;
729 }
730
731 static int
732 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
733 {
734         int l, result;
735
736         /* first off do a test unit ready.  This can error out 
737          * because of reservations or some other reason.  If it
738          * fails, the device won't let us write to the echo buffer
739          * so just return failure */
740         
741         const char spi_test_unit_ready[] = {
742                 TEST_UNIT_READY, 0, 0, 0, 0, 0
743         };
744
745         const char spi_read_buffer_descriptor[] = {
746                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
747         };
748
749         
750         /* We send a set of three TURs to clear any outstanding 
751          * unit attention conditions if they exist (Otherwise the
752          * buffer tests won't be happy).  If the TUR still fails
753          * (reservation conflict, device not ready, etc) just
754          * skip the write tests */
755         for (l = 0; ; l++) {
756                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
757                                      NULL, 0, NULL);
758
759                 if(result) {
760                         if(l >= 3)
761                                 return 0;
762                 } else {
763                         /* TUR succeeded */
764                         break;
765                 }
766         }
767
768         result = spi_execute(sdev, spi_read_buffer_descriptor, 
769                              DMA_FROM_DEVICE, buffer, 4, NULL);
770
771         if (result)
772                 /* Device has no echo buffer */
773                 return 0;
774
775         return buffer[3] + ((buffer[2] & 0x1f) << 8);
776 }
777
778 static void
779 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
780 {
781         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
782         struct scsi_target *starget = sdev->sdev_target;
783         int len = sdev->inquiry_len;
784         /* first set us up for narrow async */
785         DV_SET(offset, 0);
786         DV_SET(width, 0);
787         
788         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
789             != SPI_COMPARE_SUCCESS) {
790                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
791                 /* FIXME: should probably offline the device here? */
792                 return;
793         }
794
795         /* test width */
796         if (i->f->set_width && spi_max_width(starget) &&
797             scsi_device_wide(sdev)) {
798                 i->f->set_width(starget, 1);
799
800                 if (spi_dv_device_compare_inquiry(sdev, buffer,
801                                                    buffer + len,
802                                                    DV_LOOPS)
803                     != SPI_COMPARE_SUCCESS) {
804                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
805                         i->f->set_width(starget, 0);
806                 }
807         }
808
809         if (!i->f->set_period)
810                 return;
811
812         /* device can't handle synchronous */
813         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
814                 return;
815
816         /* len == -1 is the signal that we need to ascertain the
817          * presence of an echo buffer before trying to use it.  len ==
818          * 0 means we don't have an echo buffer */
819         len = -1;
820
821  retry:
822
823         /* now set up to the maximum */
824         DV_SET(offset, spi_max_offset(starget));
825         DV_SET(period, spi_min_period(starget));
826         /* try QAS requests; this should be harmless to set if the
827          * target supports it */
828         if (scsi_device_qas(sdev))
829                 DV_SET(qas, 1);
830         /* Also try IU transfers */
831         if (scsi_device_ius(sdev))
832                 DV_SET(iu, 1);
833         if (spi_min_period(starget) < 9) {
834                 /* This u320 (or u640). Ignore the coupled parameters
835                  * like DT and IU, but set the optional ones */
836                 DV_SET(rd_strm, 1);
837                 DV_SET(wr_flow, 1);
838                 DV_SET(rti, 1);
839                 if (spi_min_period(starget) == 8)
840                         DV_SET(pcomp_en, 1);
841         }
842         /* Do the read only INQUIRY tests */
843         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
844                        spi_dv_device_compare_inquiry);
845         /* See if we actually managed to negotiate and sustain DT */
846         if (i->f->get_dt)
847                 i->f->get_dt(starget);
848
849         /* see if the device has an echo buffer.  If it does we can do
850          * the SPI pattern write tests.  Because of some broken
851          * devices, we *only* try this on a device that has actually
852          * negotiated DT */
853
854         if (len == -1 && spi_dt(starget))
855                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
856
857         if (len <= 0) {
858                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
859                 return;
860         }
861
862         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
863                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
864                 len = SPI_MAX_ECHO_BUFFER_SIZE;
865         }
866
867         if (spi_dv_retrain(sdev, buffer, buffer + len,
868                            spi_dv_device_echo_buffer)
869             == SPI_COMPARE_SKIP_TEST) {
870                 /* OK, the stupid drive can't do a write echo buffer
871                  * test after all, fall back to the read tests */
872                 len = 0;
873                 goto retry;
874         }
875 }
876
877
878 /**     spi_dv_device - Do Domain Validation on the device
879  *      @sdev:          scsi device to validate
880  *
881  *      Performs the domain validation on the given device in the
882  *      current execution thread.  Since DV operations may sleep,
883  *      the current thread must have user context.  Also no SCSI
884  *      related locks that would deadlock I/O issued by the DV may
885  *      be held.
886  */
887 void
888 spi_dv_device(struct scsi_device *sdev)
889 {
890         struct scsi_target *starget = sdev->sdev_target;
891         u8 *buffer;
892         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
893
894         if (unlikely(scsi_device_get(sdev)))
895                 return;
896
897         buffer = kmalloc(len, GFP_KERNEL);
898
899         if (unlikely(!buffer))
900                 goto out_put;
901
902         memset(buffer, 0, len);
903
904         /* We need to verify that the actual device will quiesce; the
905          * later target quiesce is just a nice to have */
906         if (unlikely(scsi_device_quiesce(sdev)))
907                 goto out_free;
908
909         scsi_target_quiesce(starget);
910
911         spi_dv_pending(starget) = 1;
912         down(&spi_dv_sem(starget));
913
914         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
915
916         spi_dv_device_internal(sdev, buffer);
917
918         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
919
920         up(&spi_dv_sem(starget));
921         spi_dv_pending(starget) = 0;
922
923         scsi_target_resume(starget);
924
925         spi_initial_dv(starget) = 1;
926
927  out_free:
928         kfree(buffer);
929  out_put:
930         scsi_device_put(sdev);
931 }
932 EXPORT_SYMBOL(spi_dv_device);
933
934 struct work_queue_wrapper {
935         struct work_struct      work;
936         struct scsi_device      *sdev;
937 };
938
939 static void
940 spi_dv_device_work_wrapper(void *data)
941 {
942         struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
943         struct scsi_device *sdev = wqw->sdev;
944
945         kfree(wqw);
946         spi_dv_device(sdev);
947         spi_dv_pending(sdev->sdev_target) = 0;
948         scsi_device_put(sdev);
949 }
950
951
952 /**
953  *      spi_schedule_dv_device - schedule domain validation to occur on the device
954  *      @sdev:  The device to validate
955  *
956  *      Identical to spi_dv_device() above, except that the DV will be
957  *      scheduled to occur in a workqueue later.  All memory allocations
958  *      are atomic, so may be called from any context including those holding
959  *      SCSI locks.
960  */
961 void
962 spi_schedule_dv_device(struct scsi_device *sdev)
963 {
964         struct work_queue_wrapper *wqw =
965                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
966
967         if (unlikely(!wqw))
968                 return;
969
970         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
971                 kfree(wqw);
972                 return;
973         }
974         /* Set pending early (dv_device doesn't check it, only sets it) */
975         spi_dv_pending(sdev->sdev_target) = 1;
976         if (unlikely(scsi_device_get(sdev))) {
977                 kfree(wqw);
978                 spi_dv_pending(sdev->sdev_target) = 0;
979                 return;
980         }
981
982         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw);
983         wqw->sdev = sdev;
984
985         schedule_work(&wqw->work);
986 }
987 EXPORT_SYMBOL(spi_schedule_dv_device);
988
989 /**
990  * spi_display_xfer_agreement - Print the current target transfer agreement
991  * @starget: The target for which to display the agreement
992  *
993  * Each SPI port is required to maintain a transfer agreement for each
994  * other port on the bus.  This function prints a one-line summary of
995  * the current agreement; more detailed information is available in sysfs.
996  */
997 void spi_display_xfer_agreement(struct scsi_target *starget)
998 {
999         struct spi_transport_attrs *tp;
1000         tp = (struct spi_transport_attrs *)&starget->starget_data;
1001
1002         if (tp->offset > 0 && tp->period > 0) {
1003                 unsigned int picosec, kb100;
1004                 char *scsi = "FAST-?";
1005                 char tmp[8];
1006
1007                 if (tp->period <= SPI_STATIC_PPR) {
1008                         picosec = ppr_to_ps[tp->period];
1009                         switch (tp->period) {
1010                                 case  7: scsi = "FAST-320"; break;
1011                                 case  8: scsi = "FAST-160"; break;
1012                                 case  9: scsi = "FAST-80"; break;
1013                                 case 10:
1014                                 case 11: scsi = "FAST-40"; break;
1015                                 case 12: scsi = "FAST-20"; break;
1016                         }
1017                 } else {
1018                         picosec = tp->period * 4000;
1019                         if (tp->period < 25)
1020                                 scsi = "FAST-20";
1021                         else if (tp->period < 50)
1022                                 scsi = "FAST-10";
1023                         else
1024                                 scsi = "FAST-5";
1025                 }
1026
1027                 kb100 = (10000000 + picosec / 2) / picosec;
1028                 if (tp->width)
1029                         kb100 *= 2;
1030                 sprint_frac(tmp, picosec, 1000);
1031
1032                 dev_info(&starget->dev,
1033                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1034                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1035                          tp->dt ? "DT" : "ST",
1036                          tp->iu ? " IU" : "",
1037                          tp->qas  ? " QAS" : "",
1038                          tp->rd_strm ? " RDSTRM" : "",
1039                          tp->rti ? " RTI" : "",
1040                          tp->wr_flow ? " WRFLOW" : "",
1041                          tp->pcomp_en ? " PCOMP" : "",
1042                          tp->hold_mcs ? " HMCS" : "",
1043                          tmp, tp->offset);
1044         } else {
1045                 dev_info(&starget->dev, "%sasynchronous\n",
1046                                 tp->width ? "wide " : "");
1047         }
1048 }
1049 EXPORT_SYMBOL(spi_display_xfer_agreement);
1050
1051 #ifdef CONFIG_SCSI_CONSTANTS
1052 static const char * const one_byte_msgs[] = {
1053 /* 0x00 */ "Command Complete", NULL, "Save Pointers",
1054 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1055 /* 0x06 */ "Abort", "Message Reject", "Nop", "Message Parity Error",
1056 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1057 /* 0x0c */ "Bus device reset", "Abort Tag", "Clear Queue", 
1058 /* 0x0f */ "Initiate Recovery", "Release Recovery"
1059 };
1060 #define NO_ONE_BYTE_MSGS (sizeof(one_byte_msgs)  / sizeof (const char *))
1061
1062 static const char * const two_byte_msgs[] = {
1063 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1064 /* 0x23 */ "Ignore Wide Residue"
1065 };
1066 #define NO_TWO_BYTE_MSGS (sizeof(two_byte_msgs)  / sizeof (const char *))
1067
1068 static const char * const extended_msgs[] = {
1069 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1070 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request"
1071 };
1072 #define NO_EXTENDED_MSGS (sizeof(two_byte_msgs)  / sizeof (const char *))
1073
1074
1075 int spi_print_msg(const unsigned char *msg)
1076 {
1077         int len = 0, i;
1078         if (msg[0] == EXTENDED_MESSAGE) {
1079                 len = 3 + msg[1];
1080                 if (msg[2] < NO_EXTENDED_MSGS)
1081                         printk ("%s ", extended_msgs[msg[2]]); 
1082                 else 
1083                         printk ("Extended Message, reserved code (0x%02x) ",
1084                                 (int) msg[2]);
1085                 switch (msg[2]) {
1086                 case EXTENDED_MODIFY_DATA_POINTER:
1087                         printk("pointer = %d", (int) (msg[3] << 24) |
1088                                 (msg[4] << 16) | (msg[5] << 8) | msg[6]);
1089                         break;
1090                 case EXTENDED_SDTR:
1091                         printk("period = %d ns, offset = %d",
1092                                 (int) msg[3] * 4, (int) msg[4]);
1093                         break;
1094                 case EXTENDED_WDTR:
1095                         printk("width = 2^%d bytes", msg[3]);
1096                         break;
1097                 default:
1098                 for (i = 2; i < len; ++i) 
1099                         printk("%02x ", msg[i]);
1100                 }
1101         /* Identify */
1102         } else if (msg[0] & 0x80) {
1103                 printk("Identify disconnect %sallowed %s %d ",
1104                         (msg[0] & 0x40) ? "" : "not ",
1105                         (msg[0] & 0x20) ? "target routine" : "lun",
1106                         msg[0] & 0x7);
1107                 len = 1;
1108         /* Normal One byte */
1109         } else if (msg[0] < 0x1f) {
1110                 if (msg[0] < NO_ONE_BYTE_MSGS)
1111                         printk(one_byte_msgs[msg[0]]);
1112                 else
1113                         printk("reserved (%02x) ", msg[0]);
1114                 len = 1;
1115         /* Two byte */
1116         } else if (msg[0] <= 0x2f) {
1117                 if ((msg[0] - 0x20) < NO_TWO_BYTE_MSGS)
1118                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1119                                 msg[1]);
1120                 else 
1121                         printk("reserved two byte (%02x %02x) ", 
1122                                 msg[0], msg[1]);
1123                 len = 2;
1124         } else 
1125                 printk("reserved");
1126         return len;
1127 }
1128 EXPORT_SYMBOL(spi_print_msg);
1129
1130 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1131
1132 int spi_print_msg(const unsigned char *msg)
1133 {
1134         int len = 0, i;
1135
1136         if (msg[0] == EXTENDED_MESSAGE) {
1137                 len = 3 + msg[1];
1138                 for (i = 0; i < len; ++i)
1139                         printk("%02x ", msg[i]);
1140         /* Identify */
1141         } else if (msg[0] & 0x80) {
1142                 printk("%02x ", msg[0]);
1143                 len = 1;
1144         /* Normal One byte */
1145         } else if (msg[0] < 0x1f) {
1146                 printk("%02x ", msg[0]);
1147                 len = 1;
1148         /* Two byte */
1149         } else if (msg[0] <= 0x2f) {
1150                 printk("%02x %02x", msg[0], msg[1]);
1151                 len = 2;
1152         } else 
1153                 printk("%02x ", msg[0]);
1154         return len;
1155 }
1156 EXPORT_SYMBOL(spi_print_msg);
1157 #endif /* ! CONFIG_SCSI_CONSTANTS */
1158
1159 #define SETUP_ATTRIBUTE(field)                                          \
1160         i->private_attrs[count] = class_device_attr_##field;            \
1161         if (!i->f->set_##field) {                                       \
1162                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1163                 i->private_attrs[count].store = NULL;                   \
1164         }                                                               \
1165         i->attrs[count] = &i->private_attrs[count];                     \
1166         if (i->f->show_##field)                                         \
1167                 count++
1168
1169 #define SETUP_RELATED_ATTRIBUTE(field, rel_field)                       \
1170         i->private_attrs[count] = class_device_attr_##field;            \
1171         if (!i->f->set_##rel_field) {                                   \
1172                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1173                 i->private_attrs[count].store = NULL;                   \
1174         }                                                               \
1175         i->attrs[count] = &i->private_attrs[count];                     \
1176         if (i->f->show_##rel_field)                                     \
1177                 count++
1178
1179 #define SETUP_HOST_ATTRIBUTE(field)                                     \
1180         i->private_host_attrs[count] = class_device_attr_##field;       \
1181         if (!i->f->set_##field) {                                       \
1182                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1183                 i->private_host_attrs[count].store = NULL;              \
1184         }                                                               \
1185         i->host_attrs[count] = &i->private_host_attrs[count];           \
1186         count++
1187
1188 static int spi_device_match(struct attribute_container *cont,
1189                             struct device *dev)
1190 {
1191         struct scsi_device *sdev;
1192         struct Scsi_Host *shost;
1193         struct spi_internal *i;
1194
1195         if (!scsi_is_sdev_device(dev))
1196                 return 0;
1197
1198         sdev = to_scsi_device(dev);
1199         shost = sdev->host;
1200         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1201             != &spi_host_class.class)
1202                 return 0;
1203         /* Note: this class has no device attributes, so it has
1204          * no per-HBA allocation and thus we don't need to distinguish
1205          * the attribute containers for the device */
1206         i = to_spi_internal(shost->transportt);
1207         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1208                 return 0;
1209         return 1;
1210 }
1211
1212 static int spi_target_match(struct attribute_container *cont,
1213                             struct device *dev)
1214 {
1215         struct Scsi_Host *shost;
1216         struct scsi_target *starget;
1217         struct spi_internal *i;
1218
1219         if (!scsi_is_target_device(dev))
1220                 return 0;
1221
1222         shost = dev_to_shost(dev->parent);
1223         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1224             != &spi_host_class.class)
1225                 return 0;
1226
1227         i = to_spi_internal(shost->transportt);
1228         starget = to_scsi_target(dev);
1229
1230         if (i->f->deny_binding && i->f->deny_binding(starget))
1231                 return 0;
1232
1233         return &i->t.target_attrs.ac == cont;
1234 }
1235
1236 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1237                                "spi_transport",
1238                                spi_setup_transport_attrs,
1239                                NULL,
1240                                NULL);
1241
1242 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1243                                     spi_device_match,
1244                                     spi_device_configure);
1245
1246 struct scsi_transport_template *
1247 spi_attach_transport(struct spi_function_template *ft)
1248 {
1249         struct spi_internal *i = kmalloc(sizeof(struct spi_internal),
1250                                          GFP_KERNEL);
1251         int count = 0;
1252         if (unlikely(!i))
1253                 return NULL;
1254
1255         memset(i, 0, sizeof(struct spi_internal));
1256
1257
1258         i->t.target_attrs.ac.class = &spi_transport_class.class;
1259         i->t.target_attrs.ac.attrs = &i->attrs[0];
1260         i->t.target_attrs.ac.match = spi_target_match;
1261         transport_container_register(&i->t.target_attrs);
1262         i->t.target_size = sizeof(struct spi_transport_attrs);
1263         i->t.host_attrs.ac.class = &spi_host_class.class;
1264         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1265         i->t.host_attrs.ac.match = spi_host_match;
1266         transport_container_register(&i->t.host_attrs);
1267         i->t.host_size = sizeof(struct spi_host_attrs);
1268         i->f = ft;
1269
1270         SETUP_ATTRIBUTE(period);
1271         SETUP_RELATED_ATTRIBUTE(min_period, period);
1272         SETUP_ATTRIBUTE(offset);
1273         SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1274         SETUP_ATTRIBUTE(width);
1275         SETUP_RELATED_ATTRIBUTE(max_width, width);
1276         SETUP_ATTRIBUTE(iu);
1277         SETUP_ATTRIBUTE(dt);
1278         SETUP_ATTRIBUTE(qas);
1279         SETUP_ATTRIBUTE(wr_flow);
1280         SETUP_ATTRIBUTE(rd_strm);
1281         SETUP_ATTRIBUTE(rti);
1282         SETUP_ATTRIBUTE(pcomp_en);
1283         SETUP_ATTRIBUTE(hold_mcs);
1284
1285         /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1286          * this bug will trigger */
1287         BUG_ON(count > SPI_NUM_ATTRS);
1288
1289         i->attrs[count++] = &class_device_attr_revalidate;
1290
1291         i->attrs[count] = NULL;
1292
1293         count = 0;
1294         SETUP_HOST_ATTRIBUTE(signalling);
1295
1296         BUG_ON(count > SPI_HOST_ATTRS);
1297
1298         i->host_attrs[count] = NULL;
1299
1300         return &i->t;
1301 }
1302 EXPORT_SYMBOL(spi_attach_transport);
1303
1304 void spi_release_transport(struct scsi_transport_template *t)
1305 {
1306         struct spi_internal *i = to_spi_internal(t);
1307
1308         transport_container_unregister(&i->t.target_attrs);
1309         transport_container_unregister(&i->t.host_attrs);
1310
1311         kfree(i);
1312 }
1313 EXPORT_SYMBOL(spi_release_transport);
1314
1315 static __init int spi_transport_init(void)
1316 {
1317         int error = transport_class_register(&spi_transport_class);
1318         if (error)
1319                 return error;
1320         error = anon_transport_class_register(&spi_device_class);
1321         return transport_class_register(&spi_host_class);
1322 }
1323
1324 static void __exit spi_transport_exit(void)
1325 {
1326         transport_class_unregister(&spi_transport_class);
1327         anon_transport_class_unregister(&spi_device_class);
1328         transport_class_unregister(&spi_host_class);
1329 }
1330
1331 MODULE_AUTHOR("Martin Hicks");
1332 MODULE_DESCRIPTION("SPI Transport Attributes");
1333 MODULE_LICENSE("GPL");
1334
1335 module_init(spi_transport_init);
1336 module_exit(spi_transport_exit);