[S390] cio: dont forget to set last slot to NULL in ccw_uevent().
[linux-3.10.git] / drivers / s390 / cio / device.c
1 /*
2  *  drivers/s390/cio/device.c
3  *  bus driver for ccw devices
4  *
5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6  *                       IBM Corporation
7  *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
8  *               Cornelia Huck (cornelia.huck@de.ibm.com)
9  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
10  */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/spinlock.h>
14 #include <linux/errno.h>
15 #include <linux/err.h>
16 #include <linux/slab.h>
17 #include <linux/list.h>
18 #include <linux/device.h>
19 #include <linux/workqueue.h>
20
21 #include <asm/ccwdev.h>
22 #include <asm/cio.h>
23 #include <asm/param.h>          /* HZ */
24
25 #include "cio.h"
26 #include "cio_debug.h"
27 #include "css.h"
28 #include "device.h"
29 #include "ioasm.h"
30
31 /******************* bus type handling ***********************/
32
33 /* The Linux driver model distinguishes between a bus type and
34  * the bus itself. Of course we only have one channel
35  * subsystem driver and one channel system per machine, but
36  * we still use the abstraction. T.R. says it's a good idea. */
37 static int
38 ccw_bus_match (struct device * dev, struct device_driver * drv)
39 {
40         struct ccw_device *cdev = to_ccwdev(dev);
41         struct ccw_driver *cdrv = to_ccwdrv(drv);
42         const struct ccw_device_id *ids = cdrv->ids, *found;
43
44         if (!ids)
45                 return 0;
46
47         found = ccw_device_id_match(ids, &cdev->id);
48         if (!found)
49                 return 0;
50
51         cdev->id.driver_info = found->driver_info;
52
53         return 1;
54 }
55
56 /* Store modalias string delimited by prefix/suffix string into buffer with
57  * specified size. Return length of resulting string (excluding trailing '\0')
58  * even if string doesn't fit buffer (snprintf semantics). */
59 static int snprint_alias(char *buf, size_t size,
60                          struct ccw_device_id *id, const char *suffix)
61 {
62         int len;
63
64         len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
65         if (len > size)
66                 return len;
67         buf += len;
68         size -= len;
69
70         if (id->dev_type != 0)
71                 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
72                                 id->dev_model, suffix);
73         else
74                 len += snprintf(buf, size, "dtdm%s", suffix);
75
76         return len;
77 }
78
79 /* Set up environment variables for ccw device uevent. Return 0 on success,
80  * non-zero otherwise. */
81 static int ccw_uevent(struct device *dev, char **envp, int num_envp,
82                       char *buffer, int buffer_size)
83 {
84         struct ccw_device *cdev = to_ccwdev(dev);
85         struct ccw_device_id *id = &(cdev->id);
86         int i = 0;
87         int len = 0;
88         int ret;
89         char modalias_buf[30];
90
91         /* CU_TYPE= */
92         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
93                              "CU_TYPE=%04X", id->cu_type);
94         if (ret)
95                 return ret;
96
97         /* CU_MODEL= */
98         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
99                              "CU_MODEL=%02X", id->cu_model);
100         if (ret)
101                 return ret;
102
103         /* The next two can be zero, that's ok for us */
104         /* DEV_TYPE= */
105         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
106                              "DEV_TYPE=%04X", id->dev_type);
107         if (ret)
108                 return ret;
109
110         /* DEV_MODEL= */
111         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
112                              "DEV_MODEL=%02X", id->dev_model);
113         if (ret)
114                 return ret;
115
116         /* MODALIAS=  */
117         snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
118         ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
119                              "MODALIAS=%s", modalias_buf);
120         if (ret)
121                 return ret;
122         envp[i] = NULL;
123         return 0;
124 }
125
126 struct bus_type ccw_bus_type;
127
128 static int io_subchannel_probe (struct subchannel *);
129 static int io_subchannel_remove (struct subchannel *);
130 static int io_subchannel_notify(struct device *, int);
131 static void io_subchannel_verify(struct device *);
132 static void io_subchannel_ioterm(struct device *);
133 static void io_subchannel_shutdown(struct subchannel *);
134
135 static struct css_driver io_subchannel_driver = {
136         .subchannel_type = SUBCHANNEL_TYPE_IO,
137         .drv = {
138                 .name = "io_subchannel",
139                 .bus  = &css_bus_type,
140         },
141         .irq = io_subchannel_irq,
142         .notify = io_subchannel_notify,
143         .verify = io_subchannel_verify,
144         .termination = io_subchannel_ioterm,
145         .probe = io_subchannel_probe,
146         .remove = io_subchannel_remove,
147         .shutdown = io_subchannel_shutdown,
148 };
149
150 struct workqueue_struct *ccw_device_work;
151 struct workqueue_struct *ccw_device_notify_work;
152 wait_queue_head_t ccw_device_init_wq;
153 atomic_t ccw_device_init_count;
154
155 static int __init
156 init_ccw_bus_type (void)
157 {
158         int ret;
159
160         init_waitqueue_head(&ccw_device_init_wq);
161         atomic_set(&ccw_device_init_count, 0);
162
163         ccw_device_work = create_singlethread_workqueue("cio");
164         if (!ccw_device_work)
165                 return -ENOMEM; /* FIXME: better errno ? */
166         ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
167         if (!ccw_device_notify_work) {
168                 ret = -ENOMEM; /* FIXME: better errno ? */
169                 goto out_err;
170         }
171         slow_path_wq = create_singlethread_workqueue("kslowcrw");
172         if (!slow_path_wq) {
173                 ret = -ENOMEM; /* FIXME: better errno ? */
174                 goto out_err;
175         }
176         if ((ret = bus_register (&ccw_bus_type)))
177                 goto out_err;
178
179         if ((ret = driver_register(&io_subchannel_driver.drv)))
180                 goto out_err;
181
182         wait_event(ccw_device_init_wq,
183                    atomic_read(&ccw_device_init_count) == 0);
184         flush_workqueue(ccw_device_work);
185         return 0;
186 out_err:
187         if (ccw_device_work)
188                 destroy_workqueue(ccw_device_work);
189         if (ccw_device_notify_work)
190                 destroy_workqueue(ccw_device_notify_work);
191         if (slow_path_wq)
192                 destroy_workqueue(slow_path_wq);
193         return ret;
194 }
195
196 static void __exit
197 cleanup_ccw_bus_type (void)
198 {
199         driver_unregister(&io_subchannel_driver.drv);
200         bus_unregister(&ccw_bus_type);
201         destroy_workqueue(ccw_device_notify_work);
202         destroy_workqueue(ccw_device_work);
203 }
204
205 subsys_initcall(init_ccw_bus_type);
206 module_exit(cleanup_ccw_bus_type);
207
208 /************************ device handling **************************/
209
210 /*
211  * A ccw_device has some interfaces in sysfs in addition to the
212  * standard ones.
213  * The following entries are designed to export the information which
214  * resided in 2.4 in /proc/subchannels. Subchannel and device number
215  * are obvious, so they don't have an entry :)
216  * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
217  */
218 static ssize_t
219 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
220 {
221         struct subchannel *sch = to_subchannel(dev);
222         struct chsc_ssd_info *ssd = &sch->ssd_info;
223         ssize_t ret = 0;
224         int chp;
225         int mask;
226
227         for (chp = 0; chp < 8; chp++) {
228                 mask = 0x80 >> chp;
229                 if (ssd->path_mask & mask)
230                         ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
231                 else
232                         ret += sprintf(buf + ret, "00 ");
233         }
234         ret += sprintf (buf+ret, "\n");
235         return min((ssize_t)PAGE_SIZE, ret);
236 }
237
238 static ssize_t
239 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
240 {
241         struct subchannel *sch = to_subchannel(dev);
242         struct pmcw *pmcw = &sch->schib.pmcw;
243
244         return sprintf (buf, "%02x %02x %02x\n",
245                         pmcw->pim, pmcw->pam, pmcw->pom);
246 }
247
248 static ssize_t
249 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
250 {
251         struct ccw_device *cdev = to_ccwdev(dev);
252         struct ccw_device_id *id = &(cdev->id);
253
254         if (id->dev_type != 0)
255                 return sprintf(buf, "%04x/%02x\n",
256                                 id->dev_type, id->dev_model);
257         else
258                 return sprintf(buf, "n/a\n");
259 }
260
261 static ssize_t
262 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
263 {
264         struct ccw_device *cdev = to_ccwdev(dev);
265         struct ccw_device_id *id = &(cdev->id);
266
267         return sprintf(buf, "%04x/%02x\n",
268                        id->cu_type, id->cu_model);
269 }
270
271 static ssize_t
272 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
273 {
274         struct ccw_device *cdev = to_ccwdev(dev);
275         struct ccw_device_id *id = &(cdev->id);
276         int len;
277
278         len = snprint_alias(buf, PAGE_SIZE, id, "\n");
279
280         return len > PAGE_SIZE ? PAGE_SIZE : len;
281 }
282
283 static ssize_t
284 online_show (struct device *dev, struct device_attribute *attr, char *buf)
285 {
286         struct ccw_device *cdev = to_ccwdev(dev);
287
288         return sprintf(buf, cdev->online ? "1\n" : "0\n");
289 }
290
291 int ccw_device_is_orphan(struct ccw_device *cdev)
292 {
293         return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
294 }
295
296 static void ccw_device_unregister(struct ccw_device *cdev)
297 {
298         if (test_and_clear_bit(1, &cdev->private->registered))
299                 device_del(&cdev->dev);
300 }
301
302 static void ccw_device_remove_orphan_cb(struct device *dev)
303 {
304         struct ccw_device *cdev = to_ccwdev(dev);
305
306         ccw_device_unregister(cdev);
307         put_device(&cdev->dev);
308 }
309
310 static void ccw_device_remove_sch_cb(struct device *dev)
311 {
312         struct subchannel *sch;
313
314         sch = to_subchannel(dev);
315         css_sch_device_unregister(sch);
316         /* Reset intparm to zeroes. */
317         sch->schib.pmcw.intparm = 0;
318         cio_modify(sch);
319         put_device(&sch->dev);
320 }
321
322 static void
323 ccw_device_remove_disconnected(struct ccw_device *cdev)
324 {
325         unsigned long flags;
326         int rc;
327
328         /*
329          * Forced offline in disconnected state means
330          * 'throw away device'.
331          */
332         if (ccw_device_is_orphan(cdev)) {
333                 /*
334                  * Deregister ccw device.
335                  * Unfortunately, we cannot do this directly from the
336                  * attribute method.
337                  */
338                 spin_lock_irqsave(cdev->ccwlock, flags);
339                 cdev->private->state = DEV_STATE_NOT_OPER;
340                 spin_unlock_irqrestore(cdev->ccwlock, flags);
341                 rc = device_schedule_callback(&cdev->dev,
342                                               ccw_device_remove_orphan_cb);
343                 if (rc)
344                         CIO_MSG_EVENT(2, "Couldn't unregister orphan "
345                                       "0.%x.%04x\n",
346                                       cdev->private->dev_id.ssid,
347                                       cdev->private->dev_id.devno);
348                 return;
349         }
350         /* Deregister subchannel, which will kill the ccw device. */
351         rc = device_schedule_callback(cdev->dev.parent,
352                                       ccw_device_remove_sch_cb);
353         if (rc)
354                 CIO_MSG_EVENT(2, "Couldn't unregister disconnected device "
355                               "0.%x.%04x\n",
356                               cdev->private->dev_id.ssid,
357                               cdev->private->dev_id.devno);
358 }
359
360 int
361 ccw_device_set_offline(struct ccw_device *cdev)
362 {
363         int ret;
364
365         if (!cdev)
366                 return -ENODEV;
367         if (!cdev->online || !cdev->drv)
368                 return -EINVAL;
369
370         if (cdev->drv->set_offline) {
371                 ret = cdev->drv->set_offline(cdev);
372                 if (ret != 0)
373                         return ret;
374         }
375         cdev->online = 0;
376         spin_lock_irq(cdev->ccwlock);
377         ret = ccw_device_offline(cdev);
378         if (ret == -ENODEV) {
379                 if (cdev->private->state != DEV_STATE_NOT_OPER) {
380                         cdev->private->state = DEV_STATE_OFFLINE;
381                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
382                 }
383                 spin_unlock_irq(cdev->ccwlock);
384                 return ret;
385         }
386         spin_unlock_irq(cdev->ccwlock);
387         if (ret == 0)
388                 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
389         else {
390                 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
391                               "device 0.%x.%04x\n",
392                               ret, cdev->private->dev_id.ssid,
393                               cdev->private->dev_id.devno);
394                 cdev->online = 1;
395         }
396         return ret;
397 }
398
399 int
400 ccw_device_set_online(struct ccw_device *cdev)
401 {
402         int ret;
403
404         if (!cdev)
405                 return -ENODEV;
406         if (cdev->online || !cdev->drv)
407                 return -EINVAL;
408
409         spin_lock_irq(cdev->ccwlock);
410         ret = ccw_device_online(cdev);
411         spin_unlock_irq(cdev->ccwlock);
412         if (ret == 0)
413                 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
414         else {
415                 CIO_MSG_EVENT(2, "ccw_device_online returned %d, "
416                               "device 0.%x.%04x\n",
417                               ret, cdev->private->dev_id.ssid,
418                               cdev->private->dev_id.devno);
419                 return ret;
420         }
421         if (cdev->private->state != DEV_STATE_ONLINE)
422                 return -ENODEV;
423         if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
424                 cdev->online = 1;
425                 return 0;
426         }
427         spin_lock_irq(cdev->ccwlock);
428         ret = ccw_device_offline(cdev);
429         spin_unlock_irq(cdev->ccwlock);
430         if (ret == 0)
431                 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
432         else
433                 CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
434                               "device 0.%x.%04x\n",
435                               ret, cdev->private->dev_id.ssid,
436                               cdev->private->dev_id.devno);
437         return (ret == 0) ? -ENODEV : ret;
438 }
439
440 static void online_store_handle_offline(struct ccw_device *cdev)
441 {
442         if (cdev->private->state == DEV_STATE_DISCONNECTED)
443                 ccw_device_remove_disconnected(cdev);
444         else if (cdev->drv && cdev->drv->set_offline)
445                 ccw_device_set_offline(cdev);
446 }
447
448 static int online_store_recog_and_online(struct ccw_device *cdev)
449 {
450         int ret;
451
452         /* Do device recognition, if needed. */
453         if (cdev->id.cu_type == 0) {
454                 ret = ccw_device_recognition(cdev);
455                 if (ret) {
456                         CIO_MSG_EVENT(0, "Couldn't start recognition "
457                                       "for device 0.%x.%04x (ret=%d)\n",
458                                       cdev->private->dev_id.ssid,
459                                       cdev->private->dev_id.devno, ret);
460                         return ret;
461                 }
462                 wait_event(cdev->private->wait_q,
463                            cdev->private->flags.recog_done);
464         }
465         if (cdev->drv && cdev->drv->set_online)
466                 ccw_device_set_online(cdev);
467         return 0;
468 }
469 static void online_store_handle_online(struct ccw_device *cdev, int force)
470 {
471         int ret;
472
473         ret = online_store_recog_and_online(cdev);
474         if (ret)
475                 return;
476         if (force && cdev->private->state == DEV_STATE_BOXED) {
477                 ret = ccw_device_stlck(cdev);
478                 if (ret) {
479                         dev_warn(&cdev->dev,
480                                  "ccw_device_stlck returned %d!\n", ret);
481                         return;
482                 }
483                 if (cdev->id.cu_type == 0)
484                         cdev->private->state = DEV_STATE_NOT_OPER;
485                 online_store_recog_and_online(cdev);
486         }
487
488 }
489
490 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
491                              const char *buf, size_t count)
492 {
493         struct ccw_device *cdev = to_ccwdev(dev);
494         int i, force;
495         char *tmp;
496
497         if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
498                 return -EAGAIN;
499
500         if (cdev->drv && !try_module_get(cdev->drv->owner)) {
501                 atomic_set(&cdev->private->onoff, 0);
502                 return -EINVAL;
503         }
504         if (!strncmp(buf, "force\n", count)) {
505                 force = 1;
506                 i = 1;
507         } else {
508                 force = 0;
509                 i = simple_strtoul(buf, &tmp, 16);
510         }
511
512         switch (i) {
513         case 0:
514                 online_store_handle_offline(cdev);
515                 break;
516         case 1:
517                 online_store_handle_online(cdev, force);
518                 break;
519         default:
520                 count = -EINVAL;
521         }
522         if (cdev->drv)
523                 module_put(cdev->drv->owner);
524         atomic_set(&cdev->private->onoff, 0);
525         return count;
526 }
527
528 static ssize_t
529 available_show (struct device *dev, struct device_attribute *attr, char *buf)
530 {
531         struct ccw_device *cdev = to_ccwdev(dev);
532         struct subchannel *sch;
533
534         if (ccw_device_is_orphan(cdev))
535                 return sprintf(buf, "no device\n");
536         switch (cdev->private->state) {
537         case DEV_STATE_BOXED:
538                 return sprintf(buf, "boxed\n");
539         case DEV_STATE_DISCONNECTED:
540         case DEV_STATE_DISCONNECTED_SENSE_ID:
541         case DEV_STATE_NOT_OPER:
542                 sch = to_subchannel(dev->parent);
543                 if (!sch->lpm)
544                         return sprintf(buf, "no path\n");
545                 else
546                         return sprintf(buf, "no device\n");
547         default:
548                 /* All other states considered fine. */
549                 return sprintf(buf, "good\n");
550         }
551 }
552
553 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
554 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
555 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
556 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
557 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
558 static DEVICE_ATTR(online, 0644, online_show, online_store);
559 extern struct device_attribute dev_attr_cmb_enable;
560 static DEVICE_ATTR(availability, 0444, available_show, NULL);
561
562 static struct attribute * subch_attrs[] = {
563         &dev_attr_chpids.attr,
564         &dev_attr_pimpampom.attr,
565         NULL,
566 };
567
568 static struct attribute_group subch_attr_group = {
569         .attrs = subch_attrs,
570 };
571
572 struct attribute_group *subch_attr_groups[] = {
573         &subch_attr_group,
574         NULL,
575 };
576
577 static struct attribute * ccwdev_attrs[] = {
578         &dev_attr_devtype.attr,
579         &dev_attr_cutype.attr,
580         &dev_attr_modalias.attr,
581         &dev_attr_online.attr,
582         &dev_attr_cmb_enable.attr,
583         &dev_attr_availability.attr,
584         NULL,
585 };
586
587 static struct attribute_group ccwdev_attr_group = {
588         .attrs = ccwdev_attrs,
589 };
590
591 static struct attribute_group *ccwdev_attr_groups[] = {
592         &ccwdev_attr_group,
593         NULL,
594 };
595
596 /* this is a simple abstraction for device_register that sets the
597  * correct bus type and adds the bus specific files */
598 static int ccw_device_register(struct ccw_device *cdev)
599 {
600         struct device *dev = &cdev->dev;
601         int ret;
602
603         dev->bus = &ccw_bus_type;
604
605         if ((ret = device_add(dev)))
606                 return ret;
607
608         set_bit(1, &cdev->private->registered);
609         return ret;
610 }
611
612 struct match_data {
613         struct ccw_dev_id dev_id;
614         struct ccw_device * sibling;
615 };
616
617 static int
618 match_devno(struct device * dev, void * data)
619 {
620         struct match_data * d = data;
621         struct ccw_device * cdev;
622
623         cdev = to_ccwdev(dev);
624         if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
625             !ccw_device_is_orphan(cdev) &&
626             ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
627             (cdev != d->sibling))
628                 return 1;
629         return 0;
630 }
631
632 static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
633                                                      struct ccw_device *sibling)
634 {
635         struct device *dev;
636         struct match_data data;
637
638         data.dev_id = *dev_id;
639         data.sibling = sibling;
640         dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
641
642         return dev ? to_ccwdev(dev) : NULL;
643 }
644
645 static int match_orphan(struct device *dev, void *data)
646 {
647         struct ccw_dev_id *dev_id;
648         struct ccw_device *cdev;
649
650         dev_id = data;
651         cdev = to_ccwdev(dev);
652         return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
653 }
654
655 static struct ccw_device *
656 get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
657                               struct ccw_dev_id *dev_id)
658 {
659         struct device *dev;
660
661         dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
662                                 match_orphan);
663
664         return dev ? to_ccwdev(dev) : NULL;
665 }
666
667 static void
668 ccw_device_add_changed(struct work_struct *work)
669 {
670         struct ccw_device_private *priv;
671         struct ccw_device *cdev;
672
673         priv = container_of(work, struct ccw_device_private, kick_work);
674         cdev = priv->cdev;
675         if (device_add(&cdev->dev)) {
676                 put_device(&cdev->dev);
677                 return;
678         }
679         set_bit(1, &cdev->private->registered);
680 }
681
682 void ccw_device_do_unreg_rereg(struct work_struct *work)
683 {
684         struct ccw_device_private *priv;
685         struct ccw_device *cdev;
686         struct subchannel *sch;
687
688         priv = container_of(work, struct ccw_device_private, kick_work);
689         cdev = priv->cdev;
690         sch = to_subchannel(cdev->dev.parent);
691
692         ccw_device_unregister(cdev);
693         PREPARE_WORK(&cdev->private->kick_work,
694                      ccw_device_add_changed);
695         queue_work(ccw_device_work, &cdev->private->kick_work);
696 }
697
698 static void
699 ccw_device_release(struct device *dev)
700 {
701         struct ccw_device *cdev;
702
703         cdev = to_ccwdev(dev);
704         kfree(cdev->private);
705         kfree(cdev);
706 }
707
708 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
709 {
710         struct ccw_device *cdev;
711
712         cdev  = kzalloc(sizeof(*cdev), GFP_KERNEL);
713         if (cdev) {
714                 cdev->private = kzalloc(sizeof(struct ccw_device_private),
715                                         GFP_KERNEL | GFP_DMA);
716                 if (cdev->private)
717                         return cdev;
718         }
719         kfree(cdev);
720         return ERR_PTR(-ENOMEM);
721 }
722
723 static int io_subchannel_initialize_dev(struct subchannel *sch,
724                                         struct ccw_device *cdev)
725 {
726         cdev->private->cdev = cdev;
727         atomic_set(&cdev->private->onoff, 0);
728         cdev->dev.parent = &sch->dev;
729         cdev->dev.release = ccw_device_release;
730         INIT_LIST_HEAD(&cdev->private->kick_work.entry);
731         cdev->dev.groups = ccwdev_attr_groups;
732         /* Do first half of device_register. */
733         device_initialize(&cdev->dev);
734         if (!get_device(&sch->dev)) {
735                 if (cdev->dev.release)
736                         cdev->dev.release(&cdev->dev);
737                 return -ENODEV;
738         }
739         return 0;
740 }
741
742 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
743 {
744         struct ccw_device *cdev;
745         int ret;
746
747         cdev = io_subchannel_allocate_dev(sch);
748         if (!IS_ERR(cdev)) {
749                 ret = io_subchannel_initialize_dev(sch, cdev);
750                 if (ret) {
751                         kfree(cdev);
752                         cdev = ERR_PTR(ret);
753                 }
754         }
755         return cdev;
756 }
757
758 static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
759
760 static void sch_attach_device(struct subchannel *sch,
761                               struct ccw_device *cdev)
762 {
763         css_update_ssd_info(sch);
764         spin_lock_irq(sch->lock);
765         sch->dev.driver_data = cdev;
766         cdev->private->schid = sch->schid;
767         cdev->ccwlock = sch->lock;
768         device_trigger_reprobe(sch);
769         spin_unlock_irq(sch->lock);
770 }
771
772 static void sch_attach_disconnected_device(struct subchannel *sch,
773                                            struct ccw_device *cdev)
774 {
775         struct subchannel *other_sch;
776         int ret;
777
778         other_sch = to_subchannel(get_device(cdev->dev.parent));
779         ret = device_move(&cdev->dev, &sch->dev);
780         if (ret) {
781                 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
782                               "(ret=%d)!\n", cdev->private->dev_id.ssid,
783                               cdev->private->dev_id.devno, ret);
784                 put_device(&other_sch->dev);
785                 return;
786         }
787         other_sch->dev.driver_data = NULL;
788         /* No need to keep a subchannel without ccw device around. */
789         css_sch_device_unregister(other_sch);
790         put_device(&other_sch->dev);
791         sch_attach_device(sch, cdev);
792 }
793
794 static void sch_attach_orphaned_device(struct subchannel *sch,
795                                        struct ccw_device *cdev)
796 {
797         int ret;
798
799         /* Try to move the ccw device to its new subchannel. */
800         ret = device_move(&cdev->dev, &sch->dev);
801         if (ret) {
802                 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
803                               "failed (ret=%d)!\n",
804                               cdev->private->dev_id.ssid,
805                               cdev->private->dev_id.devno, ret);
806                 return;
807         }
808         sch_attach_device(sch, cdev);
809 }
810
811 static void sch_create_and_recog_new_device(struct subchannel *sch)
812 {
813         struct ccw_device *cdev;
814
815         /* Need to allocate a new ccw device. */
816         cdev = io_subchannel_create_ccwdev(sch);
817         if (IS_ERR(cdev)) {
818                 /* OK, we did everything we could... */
819                 css_sch_device_unregister(sch);
820                 return;
821         }
822         spin_lock_irq(sch->lock);
823         sch->dev.driver_data = cdev;
824         spin_unlock_irq(sch->lock);
825         /* Start recognition for the new ccw device. */
826         if (io_subchannel_recog(cdev, sch)) {
827                 spin_lock_irq(sch->lock);
828                 sch->dev.driver_data = NULL;
829                 spin_unlock_irq(sch->lock);
830                 if (cdev->dev.release)
831                         cdev->dev.release(&cdev->dev);
832                 css_sch_device_unregister(sch);
833         }
834 }
835
836
837 void ccw_device_move_to_orphanage(struct work_struct *work)
838 {
839         struct ccw_device_private *priv;
840         struct ccw_device *cdev;
841         struct ccw_device *replacing_cdev;
842         struct subchannel *sch;
843         int ret;
844         struct channel_subsystem *css;
845         struct ccw_dev_id dev_id;
846
847         priv = container_of(work, struct ccw_device_private, kick_work);
848         cdev = priv->cdev;
849         sch = to_subchannel(cdev->dev.parent);
850         css = to_css(sch->dev.parent);
851         dev_id.devno = sch->schib.pmcw.dev;
852         dev_id.ssid = sch->schid.ssid;
853
854         /*
855          * Move the orphaned ccw device to the orphanage so the replacing
856          * ccw device can take its place on the subchannel.
857          */
858         ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
859         if (ret) {
860                 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
861                               "(ret=%d)!\n", cdev->private->dev_id.ssid,
862                               cdev->private->dev_id.devno, ret);
863                 return;
864         }
865         cdev->ccwlock = css->pseudo_subchannel->lock;
866         /*
867          * Search for the replacing ccw device
868          * - among the disconnected devices
869          * - in the orphanage
870          */
871         replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
872         if (replacing_cdev) {
873                 sch_attach_disconnected_device(sch, replacing_cdev);
874                 return;
875         }
876         replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
877         if (replacing_cdev) {
878                 sch_attach_orphaned_device(sch, replacing_cdev);
879                 return;
880         }
881         sch_create_and_recog_new_device(sch);
882 }
883
884 /*
885  * Register recognized device.
886  */
887 static void
888 io_subchannel_register(struct work_struct *work)
889 {
890         struct ccw_device_private *priv;
891         struct ccw_device *cdev;
892         struct subchannel *sch;
893         int ret;
894         unsigned long flags;
895
896         priv = container_of(work, struct ccw_device_private, kick_work);
897         cdev = priv->cdev;
898         sch = to_subchannel(cdev->dev.parent);
899         css_update_ssd_info(sch);
900         /*
901          * io_subchannel_register() will also be called after device
902          * recognition has been done for a boxed device (which will already
903          * be registered). We need to reprobe since we may now have sense id
904          * information.
905          */
906         if (klist_node_attached(&cdev->dev.knode_parent)) {
907                 if (!cdev->drv) {
908                         ret = device_reprobe(&cdev->dev);
909                         if (ret)
910                                 /* We can't do much here. */
911                                 CIO_MSG_EVENT(2, "device_reprobe() returned"
912                                               " %d for 0.%x.%04x\n", ret,
913                                               cdev->private->dev_id.ssid,
914                                               cdev->private->dev_id.devno);
915                 }
916                 goto out;
917         }
918         /*
919          * Now we know this subchannel will stay, we can throw
920          * our delayed uevent.
921          */
922         sch->dev.uevent_suppress = 0;
923         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
924         /* make it known to the system */
925         ret = ccw_device_register(cdev);
926         if (ret) {
927                 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
928                               cdev->private->dev_id.ssid,
929                               cdev->private->dev_id.devno, ret);
930                 put_device(&cdev->dev);
931                 spin_lock_irqsave(sch->lock, flags);
932                 sch->dev.driver_data = NULL;
933                 spin_unlock_irqrestore(sch->lock, flags);
934                 kfree (cdev->private);
935                 kfree (cdev);
936                 put_device(&sch->dev);
937                 if (atomic_dec_and_test(&ccw_device_init_count))
938                         wake_up(&ccw_device_init_wq);
939                 return;
940         }
941         put_device(&cdev->dev);
942 out:
943         cdev->private->flags.recog_done = 1;
944         put_device(&sch->dev);
945         wake_up(&cdev->private->wait_q);
946         if (atomic_dec_and_test(&ccw_device_init_count))
947                 wake_up(&ccw_device_init_wq);
948 }
949
950 void
951 ccw_device_call_sch_unregister(struct work_struct *work)
952 {
953         struct ccw_device_private *priv;
954         struct ccw_device *cdev;
955         struct subchannel *sch;
956
957         priv = container_of(work, struct ccw_device_private, kick_work);
958         cdev = priv->cdev;
959         sch = to_subchannel(cdev->dev.parent);
960         css_sch_device_unregister(sch);
961         /* Reset intparm to zeroes. */
962         sch->schib.pmcw.intparm = 0;
963         cio_modify(sch);
964         put_device(&cdev->dev);
965         put_device(&sch->dev);
966 }
967
968 /*
969  * subchannel recognition done. Called from the state machine.
970  */
971 void
972 io_subchannel_recog_done(struct ccw_device *cdev)
973 {
974         struct subchannel *sch;
975
976         if (css_init_done == 0) {
977                 cdev->private->flags.recog_done = 1;
978                 return;
979         }
980         switch (cdev->private->state) {
981         case DEV_STATE_NOT_OPER:
982                 cdev->private->flags.recog_done = 1;
983                 /* Remove device found not operational. */
984                 if (!get_device(&cdev->dev))
985                         break;
986                 sch = to_subchannel(cdev->dev.parent);
987                 PREPARE_WORK(&cdev->private->kick_work,
988                              ccw_device_call_sch_unregister);
989                 queue_work(slow_path_wq, &cdev->private->kick_work);
990                 if (atomic_dec_and_test(&ccw_device_init_count))
991                         wake_up(&ccw_device_init_wq);
992                 break;
993         case DEV_STATE_BOXED:
994                 /* Device did not respond in time. */
995         case DEV_STATE_OFFLINE:
996                 /* 
997                  * We can't register the device in interrupt context so
998                  * we schedule a work item.
999                  */
1000                 if (!get_device(&cdev->dev))
1001                         break;
1002                 PREPARE_WORK(&cdev->private->kick_work,
1003                              io_subchannel_register);
1004                 queue_work(slow_path_wq, &cdev->private->kick_work);
1005                 break;
1006         }
1007 }
1008
1009 static int
1010 io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
1011 {
1012         int rc;
1013         struct ccw_device_private *priv;
1014
1015         sch->dev.driver_data = cdev;
1016         sch->driver = &io_subchannel_driver;
1017         cdev->ccwlock = sch->lock;
1018
1019         /* Init private data. */
1020         priv = cdev->private;
1021         priv->dev_id.devno = sch->schib.pmcw.dev;
1022         priv->dev_id.ssid = sch->schid.ssid;
1023         priv->schid = sch->schid;
1024         priv->state = DEV_STATE_NOT_OPER;
1025         INIT_LIST_HEAD(&priv->cmb_list);
1026         init_waitqueue_head(&priv->wait_q);
1027         init_timer(&priv->timer);
1028
1029         /* Set an initial name for the device. */
1030         snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
1031                   sch->schid.ssid, sch->schib.pmcw.dev);
1032
1033         /* Increase counter of devices currently in recognition. */
1034         atomic_inc(&ccw_device_init_count);
1035
1036         /* Start async. device sensing. */
1037         spin_lock_irq(sch->lock);
1038         rc = ccw_device_recognition(cdev);
1039         spin_unlock_irq(sch->lock);
1040         if (rc) {
1041                 if (atomic_dec_and_test(&ccw_device_init_count))
1042                         wake_up(&ccw_device_init_wq);
1043         }
1044         return rc;
1045 }
1046
1047 static void ccw_device_move_to_sch(struct work_struct *work)
1048 {
1049         struct ccw_device_private *priv;
1050         int rc;
1051         struct subchannel *sch;
1052         struct ccw_device *cdev;
1053         struct subchannel *former_parent;
1054
1055         priv = container_of(work, struct ccw_device_private, kick_work);
1056         sch = priv->sch;
1057         cdev = priv->cdev;
1058         former_parent = ccw_device_is_orphan(cdev) ?
1059                 NULL : to_subchannel(get_device(cdev->dev.parent));
1060         mutex_lock(&sch->reg_mutex);
1061         /* Try to move the ccw device to its new subchannel. */
1062         rc = device_move(&cdev->dev, &sch->dev);
1063         mutex_unlock(&sch->reg_mutex);
1064         if (rc) {
1065                 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1066                               "0.%x.%04x failed (ret=%d)!\n",
1067                               cdev->private->dev_id.ssid,
1068                               cdev->private->dev_id.devno, sch->schid.ssid,
1069                               sch->schid.sch_no, rc);
1070                 css_sch_device_unregister(sch);
1071                 goto out;
1072         }
1073         if (former_parent) {
1074                 spin_lock_irq(former_parent->lock);
1075                 former_parent->dev.driver_data = NULL;
1076                 spin_unlock_irq(former_parent->lock);
1077                 css_sch_device_unregister(former_parent);
1078                 /* Reset intparm to zeroes. */
1079                 former_parent->schib.pmcw.intparm = 0;
1080                 cio_modify(former_parent);
1081         }
1082         sch_attach_device(sch, cdev);
1083 out:
1084         if (former_parent)
1085                 put_device(&former_parent->dev);
1086         put_device(&cdev->dev);
1087 }
1088
1089 static int
1090 io_subchannel_probe (struct subchannel *sch)
1091 {
1092         struct ccw_device *cdev;
1093         int rc;
1094         unsigned long flags;
1095         struct ccw_dev_id dev_id;
1096
1097         if (sch->dev.driver_data) {
1098                 /*
1099                  * This subchannel already has an associated ccw_device.
1100                  * Register it and exit. This happens for all early
1101                  * device, e.g. the console.
1102                  */
1103                 cdev = sch->dev.driver_data;
1104                 device_initialize(&cdev->dev);
1105                 ccw_device_register(cdev);
1106                 /*
1107                  * Check if the device is already online. If it is
1108                  * the reference count needs to be corrected
1109                  * (see ccw_device_online and css_init_done for the
1110                  * ugly details).
1111                  */
1112                 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1113                     cdev->private->state != DEV_STATE_OFFLINE &&
1114                     cdev->private->state != DEV_STATE_BOXED)
1115                         get_device(&cdev->dev);
1116                 return 0;
1117         }
1118         /*
1119          * First check if a fitting device may be found amongst the
1120          * disconnected devices or in the orphanage.
1121          */
1122         dev_id.devno = sch->schib.pmcw.dev;
1123         dev_id.ssid = sch->schid.ssid;
1124         cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1125         if (!cdev)
1126                 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1127                                                      &dev_id);
1128         if (cdev) {
1129                 /*
1130                  * Schedule moving the device until when we have a registered
1131                  * subchannel to move to and succeed the probe. We can
1132                  * unregister later again, when the probe is through.
1133                  */
1134                 cdev->private->sch = sch;
1135                 PREPARE_WORK(&cdev->private->kick_work,
1136                              ccw_device_move_to_sch);
1137                 queue_work(slow_path_wq, &cdev->private->kick_work);
1138                 return 0;
1139         }
1140         cdev = io_subchannel_create_ccwdev(sch);
1141         if (IS_ERR(cdev))
1142                 return PTR_ERR(cdev);
1143
1144         rc = io_subchannel_recog(cdev, sch);
1145         if (rc) {
1146                 spin_lock_irqsave(sch->lock, flags);
1147                 sch->dev.driver_data = NULL;
1148                 spin_unlock_irqrestore(sch->lock, flags);
1149                 if (cdev->dev.release)
1150                         cdev->dev.release(&cdev->dev);
1151         }
1152
1153         return rc;
1154 }
1155
1156 static int
1157 io_subchannel_remove (struct subchannel *sch)
1158 {
1159         struct ccw_device *cdev;
1160         unsigned long flags;
1161
1162         if (!sch->dev.driver_data)
1163                 return 0;
1164         cdev = sch->dev.driver_data;
1165         /* Set ccw device to not operational and drop reference. */
1166         spin_lock_irqsave(cdev->ccwlock, flags);
1167         sch->dev.driver_data = NULL;
1168         cdev->private->state = DEV_STATE_NOT_OPER;
1169         spin_unlock_irqrestore(cdev->ccwlock, flags);
1170         ccw_device_unregister(cdev);
1171         put_device(&cdev->dev);
1172         return 0;
1173 }
1174
1175 static int
1176 io_subchannel_notify(struct device *dev, int event)
1177 {
1178         struct ccw_device *cdev;
1179
1180         cdev = dev->driver_data;
1181         if (!cdev)
1182                 return 0;
1183         if (!cdev->drv)
1184                 return 0;
1185         if (!cdev->online)
1186                 return 0;
1187         return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
1188 }
1189
1190 static void
1191 io_subchannel_verify(struct device *dev)
1192 {
1193         struct ccw_device *cdev;
1194
1195         cdev = dev->driver_data;
1196         if (cdev)
1197                 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1198 }
1199
1200 static void
1201 io_subchannel_ioterm(struct device *dev)
1202 {
1203         struct ccw_device *cdev;
1204
1205         cdev = dev->driver_data;
1206         if (!cdev)
1207                 return;
1208         /* Internal I/O will be retried by the interrupt handler. */
1209         if (cdev->private->flags.intretry)
1210                 return;
1211         cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1212         if (cdev->handler)
1213                 cdev->handler(cdev, cdev->private->intparm,
1214                               ERR_PTR(-EIO));
1215 }
1216
1217 static void
1218 io_subchannel_shutdown(struct subchannel *sch)
1219 {
1220         struct ccw_device *cdev;
1221         int ret;
1222
1223         cdev = sch->dev.driver_data;
1224
1225         if (cio_is_console(sch->schid))
1226                 return;
1227         if (!sch->schib.pmcw.ena)
1228                 /* Nothing to do. */
1229                 return;
1230         ret = cio_disable_subchannel(sch);
1231         if (ret != -EBUSY)
1232                 /* Subchannel is disabled, we're done. */
1233                 return;
1234         cdev->private->state = DEV_STATE_QUIESCE;
1235         if (cdev->handler)
1236                 cdev->handler(cdev, cdev->private->intparm,
1237                               ERR_PTR(-EIO));
1238         ret = ccw_device_cancel_halt_clear(cdev);
1239         if (ret == -EBUSY) {
1240                 ccw_device_set_timeout(cdev, HZ/10);
1241                 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1242         }
1243         cio_disable_subchannel(sch);
1244 }
1245
1246 #ifdef CONFIG_CCW_CONSOLE
1247 static struct ccw_device console_cdev;
1248 static struct ccw_device_private console_private;
1249 static int console_cdev_in_use;
1250
1251 static DEFINE_SPINLOCK(ccw_console_lock);
1252
1253 spinlock_t * cio_get_console_lock(void)
1254 {
1255         return &ccw_console_lock;
1256 }
1257
1258 static int
1259 ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
1260 {
1261         int rc;
1262
1263         /* Initialize the ccw_device structure. */
1264         cdev->dev.parent= &sch->dev;
1265         rc = io_subchannel_recog(cdev, sch);
1266         if (rc)
1267                 return rc;
1268
1269         /* Now wait for the async. recognition to come to an end. */
1270         spin_lock_irq(cdev->ccwlock);
1271         while (!dev_fsm_final_state(cdev))
1272                 wait_cons_dev();
1273         rc = -EIO;
1274         if (cdev->private->state != DEV_STATE_OFFLINE)
1275                 goto out_unlock;
1276         ccw_device_online(cdev);
1277         while (!dev_fsm_final_state(cdev))
1278                 wait_cons_dev();
1279         if (cdev->private->state != DEV_STATE_ONLINE)
1280                 goto out_unlock;
1281         rc = 0;
1282 out_unlock:
1283         spin_unlock_irq(cdev->ccwlock);
1284         return 0;
1285 }
1286
1287 struct ccw_device *
1288 ccw_device_probe_console(void)
1289 {
1290         struct subchannel *sch;
1291         int ret;
1292
1293         if (xchg(&console_cdev_in_use, 1) != 0)
1294                 return ERR_PTR(-EBUSY);
1295         sch = cio_probe_console();
1296         if (IS_ERR(sch)) {
1297                 console_cdev_in_use = 0;
1298                 return (void *) sch;
1299         }
1300         memset(&console_cdev, 0, sizeof(struct ccw_device));
1301         memset(&console_private, 0, sizeof(struct ccw_device_private));
1302         console_cdev.private = &console_private;
1303         console_private.cdev = &console_cdev;
1304         ret = ccw_device_console_enable(&console_cdev, sch);
1305         if (ret) {
1306                 cio_release_console();
1307                 console_cdev_in_use = 0;
1308                 return ERR_PTR(ret);
1309         }
1310         console_cdev.online = 1;
1311         return &console_cdev;
1312 }
1313 #endif
1314
1315 /*
1316  * get ccw_device matching the busid, but only if owned by cdrv
1317  */
1318 static int
1319 __ccwdev_check_busid(struct device *dev, void *id)
1320 {
1321         char *bus_id;
1322
1323         bus_id = id;
1324
1325         return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
1326 }
1327
1328
1329 struct ccw_device *
1330 get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
1331 {
1332         struct device *dev;
1333         struct device_driver *drv;
1334
1335         drv = get_driver(&cdrv->driver);
1336         if (!drv)
1337                 return NULL;
1338
1339         dev = driver_find_device(drv, NULL, (void *)bus_id,
1340                                  __ccwdev_check_busid);
1341         put_driver(drv);
1342
1343         return dev ? to_ccwdev(dev) : NULL;
1344 }
1345
1346 /************************** device driver handling ************************/
1347
1348 /* This is the implementation of the ccw_driver class. The probe, remove
1349  * and release methods are initially very similar to the device_driver
1350  * implementations, with the difference that they have ccw_device
1351  * arguments.
1352  *
1353  * A ccw driver also contains the information that is needed for
1354  * device matching.
1355  */
1356 static int
1357 ccw_device_probe (struct device *dev)
1358 {
1359         struct ccw_device *cdev = to_ccwdev(dev);
1360         struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1361         int ret;
1362
1363         cdev->drv = cdrv; /* to let the driver call _set_online */
1364
1365         ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1366
1367         if (ret) {
1368                 cdev->drv = NULL;
1369                 return ret;
1370         }
1371
1372         return 0;
1373 }
1374
1375 static int
1376 ccw_device_remove (struct device *dev)
1377 {
1378         struct ccw_device *cdev = to_ccwdev(dev);
1379         struct ccw_driver *cdrv = cdev->drv;
1380         int ret;
1381
1382         if (cdrv->remove)
1383                 cdrv->remove(cdev);
1384         if (cdev->online) {
1385                 cdev->online = 0;
1386                 spin_lock_irq(cdev->ccwlock);
1387                 ret = ccw_device_offline(cdev);
1388                 spin_unlock_irq(cdev->ccwlock);
1389                 if (ret == 0)
1390                         wait_event(cdev->private->wait_q,
1391                                    dev_fsm_final_state(cdev));
1392                 else
1393                         //FIXME: we can't fail!
1394                         CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
1395                                       "device 0.%x.%04x\n",
1396                                       ret, cdev->private->dev_id.ssid,
1397                                       cdev->private->dev_id.devno);
1398         }
1399         ccw_device_set_timeout(cdev, 0);
1400         cdev->drv = NULL;
1401         return 0;
1402 }
1403
1404 struct bus_type ccw_bus_type = {
1405         .name   = "ccw",
1406         .match  = ccw_bus_match,
1407         .uevent = ccw_uevent,
1408         .probe  = ccw_device_probe,
1409         .remove = ccw_device_remove,
1410 };
1411
1412 int
1413 ccw_driver_register (struct ccw_driver *cdriver)
1414 {
1415         struct device_driver *drv = &cdriver->driver;
1416
1417         drv->bus = &ccw_bus_type;
1418         drv->name = cdriver->name;
1419
1420         return driver_register(drv);
1421 }
1422
1423 void
1424 ccw_driver_unregister (struct ccw_driver *cdriver)
1425 {
1426         driver_unregister(&cdriver->driver);
1427 }
1428
1429 /* Helper func for qdio. */
1430 struct subchannel_id
1431 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1432 {
1433         struct subchannel *sch;
1434
1435         sch = to_subchannel(cdev->dev.parent);
1436         return sch->schid;
1437 }
1438
1439 MODULE_LICENSE("GPL");
1440 EXPORT_SYMBOL(ccw_device_set_online);
1441 EXPORT_SYMBOL(ccw_device_set_offline);
1442 EXPORT_SYMBOL(ccw_driver_register);
1443 EXPORT_SYMBOL(ccw_driver_unregister);
1444 EXPORT_SYMBOL(get_ccwdev_by_busid);
1445 EXPORT_SYMBOL(ccw_bus_type);
1446 EXPORT_SYMBOL(ccw_device_work);
1447 EXPORT_SYMBOL(ccw_device_notify_work);
1448 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);