Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device.c | |
3 | * bus driver for ccw devices | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
10 | */ | |
1da177e4 LT |
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> | |
4e57b681 | 23 | #include <asm/param.h> /* HZ */ |
1da177e4 LT |
24 | |
25 | #include "cio.h" | |
26 | #include "css.h" | |
27 | #include "device.h" | |
28 | #include "ioasm.h" | |
29 | ||
30 | /******************* bus type handling ***********************/ | |
31 | ||
32 | /* The Linux driver model distinguishes between a bus type and | |
33 | * the bus itself. Of course we only have one channel | |
34 | * subsystem driver and one channel system per machine, but | |
35 | * we still use the abstraction. T.R. says it's a good idea. */ | |
36 | static int | |
37 | ccw_bus_match (struct device * dev, struct device_driver * drv) | |
38 | { | |
39 | struct ccw_device *cdev = to_ccwdev(dev); | |
40 | struct ccw_driver *cdrv = to_ccwdrv(drv); | |
41 | const struct ccw_device_id *ids = cdrv->ids, *found; | |
42 | ||
43 | if (!ids) | |
44 | return 0; | |
45 | ||
46 | found = ccw_device_id_match(ids, &cdev->id); | |
47 | if (!found) | |
48 | return 0; | |
49 | ||
50 | cdev->id.driver_info = found->driver_info; | |
51 | ||
52 | return 1; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Hotplugging interface for ccw devices. | |
57 | * Heavily modeled on pci and usb hotplug. | |
58 | */ | |
59 | static int | |
6d20b035 | 60 | ccw_uevent (struct device *dev, char **envp, int num_envp, |
1da177e4 LT |
61 | char *buffer, int buffer_size) |
62 | { | |
63 | struct ccw_device *cdev = to_ccwdev(dev); | |
64 | int i = 0; | |
65 | int length = 0; | |
66 | ||
67 | if (!cdev) | |
68 | return -ENODEV; | |
69 | ||
70 | /* what we want to pass to /sbin/hotplug */ | |
71 | ||
72 | envp[i++] = buffer; | |
73 | length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X", | |
74 | cdev->id.cu_type); | |
75 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
76 | return -ENOMEM; | |
77 | ++length; | |
78 | buffer += length; | |
79 | ||
80 | envp[i++] = buffer; | |
81 | length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X", | |
82 | cdev->id.cu_model); | |
83 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
84 | return -ENOMEM; | |
85 | ++length; | |
86 | buffer += length; | |
87 | ||
88 | /* The next two can be zero, that's ok for us */ | |
89 | envp[i++] = buffer; | |
90 | length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X", | |
91 | cdev->id.dev_type); | |
92 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
93 | return -ENOMEM; | |
94 | ++length; | |
95 | buffer += length; | |
96 | ||
97 | envp[i++] = buffer; | |
98 | length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X", | |
99 | cdev->id.dev_model); | |
100 | if ((buffer_size - length <= 0) || (i >= num_envp)) | |
101 | return -ENOMEM; | |
102 | ||
d2c993d8 | 103 | envp[i] = NULL; |
1da177e4 LT |
104 | |
105 | return 0; | |
106 | } | |
107 | ||
8bbace7e | 108 | struct bus_type ccw_bus_type; |
1da177e4 | 109 | |
8bbace7e CH |
110 | static int io_subchannel_probe (struct subchannel *); |
111 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
112 | void io_subchannel_irq (struct device *); |
113 | static int io_subchannel_notify(struct device *, int); | |
114 | static void io_subchannel_verify(struct device *); | |
115 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 116 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 LT |
117 | |
118 | struct css_driver io_subchannel_driver = { | |
119 | .subchannel_type = SUBCHANNEL_TYPE_IO, | |
120 | .drv = { | |
121 | .name = "io_subchannel", | |
122 | .bus = &css_bus_type, | |
1da177e4 LT |
123 | }, |
124 | .irq = io_subchannel_irq, | |
125 | .notify = io_subchannel_notify, | |
126 | .verify = io_subchannel_verify, | |
127 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
128 | .probe = io_subchannel_probe, |
129 | .remove = io_subchannel_remove, | |
130 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
131 | }; |
132 | ||
133 | struct workqueue_struct *ccw_device_work; | |
134 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
135 | wait_queue_head_t ccw_device_init_wq; |
136 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
137 | |
138 | static int __init | |
139 | init_ccw_bus_type (void) | |
140 | { | |
141 | int ret; | |
142 | ||
143 | init_waitqueue_head(&ccw_device_init_wq); | |
144 | atomic_set(&ccw_device_init_count, 0); | |
145 | ||
146 | ccw_device_work = create_singlethread_workqueue("cio"); | |
147 | if (!ccw_device_work) | |
148 | return -ENOMEM; /* FIXME: better errno ? */ | |
149 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
150 | if (!ccw_device_notify_work) { | |
151 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
152 | goto out_err; | |
153 | } | |
154 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
155 | if (!slow_path_wq) { | |
156 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
157 | goto out_err; | |
158 | } | |
159 | if ((ret = bus_register (&ccw_bus_type))) | |
160 | goto out_err; | |
161 | ||
162 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
163 | goto out_err; | |
164 | ||
165 | wait_event(ccw_device_init_wq, | |
166 | atomic_read(&ccw_device_init_count) == 0); | |
167 | flush_workqueue(ccw_device_work); | |
168 | return 0; | |
169 | out_err: | |
170 | if (ccw_device_work) | |
171 | destroy_workqueue(ccw_device_work); | |
172 | if (ccw_device_notify_work) | |
173 | destroy_workqueue(ccw_device_notify_work); | |
174 | if (slow_path_wq) | |
175 | destroy_workqueue(slow_path_wq); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static void __exit | |
180 | cleanup_ccw_bus_type (void) | |
181 | { | |
182 | driver_unregister(&io_subchannel_driver.drv); | |
183 | bus_unregister(&ccw_bus_type); | |
184 | destroy_workqueue(ccw_device_notify_work); | |
185 | destroy_workqueue(ccw_device_work); | |
186 | } | |
187 | ||
188 | subsys_initcall(init_ccw_bus_type); | |
189 | module_exit(cleanup_ccw_bus_type); | |
190 | ||
191 | /************************ device handling **************************/ | |
192 | ||
193 | /* | |
194 | * A ccw_device has some interfaces in sysfs in addition to the | |
195 | * standard ones. | |
196 | * The following entries are designed to export the information which | |
197 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
198 | * are obvious, so they don't have an entry :) | |
199 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
200 | */ | |
201 | static ssize_t | |
3fd3c0a5 | 202 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
203 | { |
204 | struct subchannel *sch = to_subchannel(dev); | |
205 | struct ssd_info *ssd = &sch->ssd_info; | |
206 | ssize_t ret = 0; | |
207 | int chp; | |
208 | ||
209 | for (chp = 0; chp < 8; chp++) | |
210 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); | |
211 | ||
212 | ret += sprintf (buf+ret, "\n"); | |
213 | return min((ssize_t)PAGE_SIZE, ret); | |
214 | } | |
215 | ||
216 | static ssize_t | |
3fd3c0a5 | 217 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
218 | { |
219 | struct subchannel *sch = to_subchannel(dev); | |
220 | struct pmcw *pmcw = &sch->schib.pmcw; | |
221 | ||
222 | return sprintf (buf, "%02x %02x %02x\n", | |
223 | pmcw->pim, pmcw->pam, pmcw->pom); | |
224 | } | |
225 | ||
226 | static ssize_t | |
3fd3c0a5 | 227 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
228 | { |
229 | struct ccw_device *cdev = to_ccwdev(dev); | |
230 | struct ccw_device_id *id = &(cdev->id); | |
231 | ||
232 | if (id->dev_type != 0) | |
233 | return sprintf(buf, "%04x/%02x\n", | |
234 | id->dev_type, id->dev_model); | |
235 | else | |
236 | return sprintf(buf, "n/a\n"); | |
237 | } | |
238 | ||
239 | static ssize_t | |
3fd3c0a5 | 240 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
241 | { |
242 | struct ccw_device *cdev = to_ccwdev(dev); | |
243 | struct ccw_device_id *id = &(cdev->id); | |
244 | ||
245 | return sprintf(buf, "%04x/%02x\n", | |
246 | id->cu_type, id->cu_model); | |
247 | } | |
248 | ||
f1fc78a8 BB |
249 | static ssize_t |
250 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
251 | { | |
252 | struct ccw_device *cdev = to_ccwdev(dev); | |
253 | struct ccw_device_id *id = &(cdev->id); | |
254 | int ret; | |
255 | ||
b1969fa4 | 256 | ret = sprintf(buf, "ccw:t%04Xm%02X", |
f1fc78a8 BB |
257 | id->cu_type, id->cu_model); |
258 | if (id->dev_type != 0) | |
259 | ret += sprintf(buf + ret, "dt%04Xdm%02X\n", | |
260 | id->dev_type, id->dev_model); | |
261 | else | |
262 | ret += sprintf(buf + ret, "dtdm\n"); | |
263 | return ret; | |
264 | } | |
265 | ||
1da177e4 | 266 | static ssize_t |
3fd3c0a5 | 267 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
268 | { |
269 | struct ccw_device *cdev = to_ccwdev(dev); | |
270 | ||
271 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
272 | } | |
273 | ||
274 | static void | |
275 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
276 | { | |
277 | struct subchannel *sch; | |
278 | /* | |
279 | * Forced offline in disconnected state means | |
280 | * 'throw away device'. | |
281 | */ | |
282 | sch = to_subchannel(cdev->dev.parent); | |
6ab4879a | 283 | css_sch_device_unregister(sch); |
1da177e4 LT |
284 | /* Reset intparm to zeroes. */ |
285 | sch->schib.pmcw.intparm = 0; | |
286 | cio_modify(sch); | |
287 | put_device(&sch->dev); | |
288 | } | |
289 | ||
290 | int | |
291 | ccw_device_set_offline(struct ccw_device *cdev) | |
292 | { | |
293 | int ret; | |
294 | ||
295 | if (!cdev) | |
296 | return -ENODEV; | |
297 | if (!cdev->online || !cdev->drv) | |
298 | return -EINVAL; | |
299 | ||
300 | if (cdev->drv->set_offline) { | |
301 | ret = cdev->drv->set_offline(cdev); | |
302 | if (ret != 0) | |
303 | return ret; | |
304 | } | |
305 | cdev->online = 0; | |
306 | spin_lock_irq(cdev->ccwlock); | |
307 | ret = ccw_device_offline(cdev); | |
308 | if (ret == -ENODEV) { | |
309 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
310 | cdev->private->state = DEV_STATE_OFFLINE; | |
311 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
312 | } | |
313 | spin_unlock_irq(cdev->ccwlock); | |
314 | return ret; | |
315 | } | |
316 | spin_unlock_irq(cdev->ccwlock); | |
317 | if (ret == 0) | |
318 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
319 | else { | |
320 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
321 | ret, cdev->dev.bus_id); | |
322 | cdev->online = 1; | |
323 | } | |
324 | return ret; | |
325 | } | |
326 | ||
327 | int | |
328 | ccw_device_set_online(struct ccw_device *cdev) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | if (!cdev) | |
333 | return -ENODEV; | |
334 | if (cdev->online || !cdev->drv) | |
335 | return -EINVAL; | |
336 | ||
337 | spin_lock_irq(cdev->ccwlock); | |
338 | ret = ccw_device_online(cdev); | |
339 | spin_unlock_irq(cdev->ccwlock); | |
340 | if (ret == 0) | |
341 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
342 | else { | |
343 | pr_debug("ccw_device_online returned %d, device %s\n", | |
344 | ret, cdev->dev.bus_id); | |
345 | return ret; | |
346 | } | |
347 | if (cdev->private->state != DEV_STATE_ONLINE) | |
348 | return -ENODEV; | |
349 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
350 | cdev->online = 1; | |
351 | return 0; | |
352 | } | |
353 | spin_lock_irq(cdev->ccwlock); | |
354 | ret = ccw_device_offline(cdev); | |
355 | spin_unlock_irq(cdev->ccwlock); | |
356 | if (ret == 0) | |
357 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
358 | else | |
359 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
360 | ret, cdev->dev.bus_id); | |
6cadb78b | 361 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
362 | } |
363 | ||
364 | static ssize_t | |
3fd3c0a5 | 365 | online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
366 | { |
367 | struct ccw_device *cdev = to_ccwdev(dev); | |
368 | int i, force, ret; | |
369 | char *tmp; | |
370 | ||
973bd993 | 371 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
372 | return -EAGAIN; |
373 | ||
374 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
375 | atomic_set(&cdev->private->onoff, 0); | |
376 | return -EINVAL; | |
377 | } | |
378 | if (!strncmp(buf, "force\n", count)) { | |
379 | force = 1; | |
380 | i = 1; | |
381 | } else { | |
382 | force = 0; | |
383 | i = simple_strtoul(buf, &tmp, 16); | |
384 | } | |
385 | if (i == 1) { | |
386 | /* Do device recognition, if needed. */ | |
387 | if (cdev->id.cu_type == 0) { | |
388 | ret = ccw_device_recognition(cdev); | |
389 | if (ret) { | |
390 | printk(KERN_WARNING"Couldn't start recognition " | |
391 | "for device %s (ret=%d)\n", | |
392 | cdev->dev.bus_id, ret); | |
393 | goto out; | |
394 | } | |
395 | wait_event(cdev->private->wait_q, | |
396 | cdev->private->flags.recog_done); | |
397 | } | |
398 | if (cdev->drv && cdev->drv->set_online) | |
399 | ccw_device_set_online(cdev); | |
400 | } else if (i == 0) { | |
401 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
402 | ccw_device_remove_disconnected(cdev); | |
403 | else if (cdev->drv && cdev->drv->set_offline) | |
404 | ccw_device_set_offline(cdev); | |
405 | } | |
406 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
407 | ret = ccw_device_stlck(cdev); | |
408 | if (ret) { | |
409 | printk(KERN_WARNING"ccw_device_stlck for device %s " | |
410 | "returned %d!\n", cdev->dev.bus_id, ret); | |
411 | goto out; | |
412 | } | |
413 | /* Do device recognition, if needed. */ | |
414 | if (cdev->id.cu_type == 0) { | |
415 | cdev->private->state = DEV_STATE_NOT_OPER; | |
416 | ret = ccw_device_recognition(cdev); | |
417 | if (ret) { | |
418 | printk(KERN_WARNING"Couldn't start recognition " | |
419 | "for device %s (ret=%d)\n", | |
420 | cdev->dev.bus_id, ret); | |
421 | goto out; | |
422 | } | |
423 | wait_event(cdev->private->wait_q, | |
424 | cdev->private->flags.recog_done); | |
425 | } | |
426 | if (cdev->drv && cdev->drv->set_online) | |
427 | ccw_device_set_online(cdev); | |
428 | } | |
429 | out: | |
430 | if (cdev->drv) | |
431 | module_put(cdev->drv->owner); | |
432 | atomic_set(&cdev->private->onoff, 0); | |
433 | return count; | |
434 | } | |
435 | ||
436 | static ssize_t | |
3fd3c0a5 | 437 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
438 | { |
439 | struct ccw_device *cdev = to_ccwdev(dev); | |
440 | struct subchannel *sch; | |
441 | ||
442 | switch (cdev->private->state) { | |
443 | case DEV_STATE_BOXED: | |
444 | return sprintf(buf, "boxed\n"); | |
445 | case DEV_STATE_DISCONNECTED: | |
446 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
447 | case DEV_STATE_NOT_OPER: | |
448 | sch = to_subchannel(dev->parent); | |
449 | if (!sch->lpm) | |
450 | return sprintf(buf, "no path\n"); | |
451 | else | |
452 | return sprintf(buf, "no device\n"); | |
453 | default: | |
454 | /* All other states considered fine. */ | |
455 | return sprintf(buf, "good\n"); | |
456 | } | |
457 | } | |
458 | ||
459 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
460 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
461 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
462 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 463 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
464 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
465 | extern struct device_attribute dev_attr_cmb_enable; | |
466 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
467 | ||
468 | static struct attribute * subch_attrs[] = { | |
469 | &dev_attr_chpids.attr, | |
470 | &dev_attr_pimpampom.attr, | |
471 | NULL, | |
472 | }; | |
473 | ||
474 | static struct attribute_group subch_attr_group = { | |
475 | .attrs = subch_attrs, | |
476 | }; | |
477 | ||
478 | static inline int | |
479 | subchannel_add_files (struct device *dev) | |
480 | { | |
481 | return sysfs_create_group(&dev->kobj, &subch_attr_group); | |
482 | } | |
483 | ||
484 | static struct attribute * ccwdev_attrs[] = { | |
485 | &dev_attr_devtype.attr, | |
486 | &dev_attr_cutype.attr, | |
f1fc78a8 | 487 | &dev_attr_modalias.attr, |
1da177e4 LT |
488 | &dev_attr_online.attr, |
489 | &dev_attr_cmb_enable.attr, | |
490 | &dev_attr_availability.attr, | |
491 | NULL, | |
492 | }; | |
493 | ||
494 | static struct attribute_group ccwdev_attr_group = { | |
495 | .attrs = ccwdev_attrs, | |
496 | }; | |
497 | ||
498 | static inline int | |
499 | device_add_files (struct device *dev) | |
500 | { | |
501 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); | |
502 | } | |
503 | ||
504 | static inline void | |
505 | device_remove_files(struct device *dev) | |
506 | { | |
507 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); | |
508 | } | |
509 | ||
510 | /* this is a simple abstraction for device_register that sets the | |
511 | * correct bus type and adds the bus specific files */ | |
512 | int | |
513 | ccw_device_register(struct ccw_device *cdev) | |
514 | { | |
515 | struct device *dev = &cdev->dev; | |
516 | int ret; | |
517 | ||
518 | dev->bus = &ccw_bus_type; | |
519 | ||
520 | if ((ret = device_add(dev))) | |
521 | return ret; | |
522 | ||
523 | set_bit(1, &cdev->private->registered); | |
524 | if ((ret = device_add_files(dev))) { | |
525 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
526 | device_del(dev); | |
527 | } | |
528 | return ret; | |
529 | } | |
530 | ||
b0744bd2 | 531 | struct match_data { |
fb6958a5 CH |
532 | unsigned int devno; |
533 | unsigned int ssid; | |
b0744bd2 CH |
534 | struct ccw_device * sibling; |
535 | }; | |
536 | ||
537 | static int | |
538 | match_devno(struct device * dev, void * data) | |
539 | { | |
540 | struct match_data * d = (struct match_data *)data; | |
541 | struct ccw_device * cdev; | |
542 | ||
543 | cdev = to_ccwdev(dev); | |
544 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
545 | (cdev->private->devno == d->devno) && | |
fb6958a5 | 546 | (cdev->private->ssid == d->ssid) && |
b0744bd2 CH |
547 | (cdev != d->sibling)) { |
548 | cdev->private->state = DEV_STATE_NOT_OPER; | |
549 | return 1; | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
1da177e4 | 554 | static struct ccw_device * |
fb6958a5 CH |
555 | get_disc_ccwdev_by_devno(unsigned int devno, unsigned int ssid, |
556 | struct ccw_device *sibling) | |
1da177e4 | 557 | { |
1da177e4 | 558 | struct device *dev; |
292888c8 | 559 | struct match_data data; |
1da177e4 | 560 | |
292888c8 HC |
561 | data.devno = devno; |
562 | data.ssid = ssid; | |
563 | data.sibling = sibling; | |
e5945b4f | 564 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 565 | |
b0744bd2 | 566 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
567 | } |
568 | ||
569 | static void | |
570 | ccw_device_add_changed(void *data) | |
571 | { | |
572 | ||
573 | struct ccw_device *cdev; | |
574 | ||
575 | cdev = (struct ccw_device *)data; | |
576 | if (device_add(&cdev->dev)) { | |
577 | put_device(&cdev->dev); | |
578 | return; | |
579 | } | |
580 | set_bit(1, &cdev->private->registered); | |
581 | if (device_add_files(&cdev->dev)) { | |
582 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
583 | device_unregister(&cdev->dev); | |
584 | } | |
585 | } | |
586 | ||
587 | extern int css_get_ssd_info(struct subchannel *sch); | |
588 | ||
589 | void | |
590 | ccw_device_do_unreg_rereg(void *data) | |
591 | { | |
592 | struct ccw_device *cdev; | |
593 | struct subchannel *sch; | |
594 | int need_rename; | |
595 | ||
596 | cdev = (struct ccw_device *)data; | |
597 | sch = to_subchannel(cdev->dev.parent); | |
598 | if (cdev->private->devno != sch->schib.pmcw.dev) { | |
599 | /* | |
600 | * The device number has changed. This is usually only when | |
601 | * a device has been detached under VM and then re-appeared | |
602 | * on another subchannel because of a different attachment | |
603 | * order than before. Ideally, we should should just switch | |
604 | * subchannels, but unfortunately, this is not possible with | |
605 | * the current implementation. | |
606 | * Instead, we search for the old subchannel for this device | |
607 | * number and deregister so there are no collisions with the | |
608 | * newly registered ccw_device. | |
609 | * FIXME: Find another solution so the block layer doesn't | |
610 | * get possibly sick... | |
611 | */ | |
612 | struct ccw_device *other_cdev; | |
613 | ||
614 | need_rename = 1; | |
615 | other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev, | |
fb6958a5 | 616 | sch->schid.ssid, cdev); |
1da177e4 LT |
617 | if (other_cdev) { |
618 | struct subchannel *other_sch; | |
619 | ||
620 | other_sch = to_subchannel(other_cdev->dev.parent); | |
621 | if (get_device(&other_sch->dev)) { | |
a8237fc4 | 622 | stsch(other_sch->schid, &other_sch->schib); |
1da177e4 LT |
623 | if (other_sch->schib.pmcw.dnv) { |
624 | other_sch->schib.pmcw.intparm = 0; | |
625 | cio_modify(other_sch); | |
626 | } | |
6ab4879a | 627 | css_sch_device_unregister(other_sch); |
1da177e4 LT |
628 | } |
629 | } | |
630 | /* Update ssd info here. */ | |
631 | css_get_ssd_info(sch); | |
632 | cdev->private->devno = sch->schib.pmcw.dev; | |
633 | } else | |
634 | need_rename = 0; | |
635 | device_remove_files(&cdev->dev); | |
636 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
637 | device_del(&cdev->dev); | |
638 | if (need_rename) | |
fb6958a5 CH |
639 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
640 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
641 | PREPARE_WORK(&cdev->private->kick_work, |
642 | ccw_device_add_changed, (void *)cdev); | |
643 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
644 | } | |
645 | ||
646 | static void | |
647 | ccw_device_release(struct device *dev) | |
648 | { | |
649 | struct ccw_device *cdev; | |
650 | ||
651 | cdev = to_ccwdev(dev); | |
652 | kfree(cdev->private); | |
653 | kfree(cdev); | |
654 | } | |
655 | ||
656 | /* | |
657 | * Register recognized device. | |
658 | */ | |
659 | static void | |
660 | io_subchannel_register(void *data) | |
661 | { | |
662 | struct ccw_device *cdev; | |
663 | struct subchannel *sch; | |
664 | int ret; | |
665 | unsigned long flags; | |
666 | ||
667 | cdev = (struct ccw_device *) data; | |
668 | sch = to_subchannel(cdev->dev.parent); | |
669 | ||
b0744bd2 | 670 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
1da177e4 LT |
671 | bus_rescan_devices(&ccw_bus_type); |
672 | goto out; | |
673 | } | |
674 | /* make it known to the system */ | |
675 | ret = ccw_device_register(cdev); | |
676 | if (ret) { | |
677 | printk (KERN_WARNING "%s: could not register %s\n", | |
678 | __func__, cdev->dev.bus_id); | |
679 | put_device(&cdev->dev); | |
680 | spin_lock_irqsave(&sch->lock, flags); | |
681 | sch->dev.driver_data = NULL; | |
682 | spin_unlock_irqrestore(&sch->lock, flags); | |
683 | kfree (cdev->private); | |
684 | kfree (cdev); | |
685 | put_device(&sch->dev); | |
686 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
687 | wake_up(&ccw_device_init_wq); | |
688 | return; | |
689 | } | |
690 | ||
691 | ret = subchannel_add_files(cdev->dev.parent); | |
692 | if (ret) | |
693 | printk(KERN_WARNING "%s: could not add attributes to %s\n", | |
694 | __func__, sch->dev.bus_id); | |
695 | put_device(&cdev->dev); | |
696 | out: | |
697 | cdev->private->flags.recog_done = 1; | |
698 | put_device(&sch->dev); | |
699 | wake_up(&cdev->private->wait_q); | |
700 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
701 | wake_up(&ccw_device_init_wq); | |
702 | } | |
703 | ||
704 | void | |
705 | ccw_device_call_sch_unregister(void *data) | |
706 | { | |
707 | struct ccw_device *cdev = data; | |
708 | struct subchannel *sch; | |
709 | ||
710 | sch = to_subchannel(cdev->dev.parent); | |
6ab4879a | 711 | css_sch_device_unregister(sch); |
1da177e4 LT |
712 | /* Reset intparm to zeroes. */ |
713 | sch->schib.pmcw.intparm = 0; | |
714 | cio_modify(sch); | |
715 | put_device(&cdev->dev); | |
716 | put_device(&sch->dev); | |
717 | } | |
718 | ||
719 | /* | |
720 | * subchannel recognition done. Called from the state machine. | |
721 | */ | |
722 | void | |
723 | io_subchannel_recog_done(struct ccw_device *cdev) | |
724 | { | |
725 | struct subchannel *sch; | |
726 | ||
727 | if (css_init_done == 0) { | |
728 | cdev->private->flags.recog_done = 1; | |
729 | return; | |
730 | } | |
731 | switch (cdev->private->state) { | |
732 | case DEV_STATE_NOT_OPER: | |
733 | cdev->private->flags.recog_done = 1; | |
734 | /* Remove device found not operational. */ | |
735 | if (!get_device(&cdev->dev)) | |
736 | break; | |
737 | sch = to_subchannel(cdev->dev.parent); | |
738 | PREPARE_WORK(&cdev->private->kick_work, | |
739 | ccw_device_call_sch_unregister, (void *) cdev); | |
740 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
741 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
742 | wake_up(&ccw_device_init_wq); | |
743 | break; | |
744 | case DEV_STATE_BOXED: | |
745 | /* Device did not respond in time. */ | |
746 | case DEV_STATE_OFFLINE: | |
747 | /* | |
748 | * We can't register the device in interrupt context so | |
749 | * we schedule a work item. | |
750 | */ | |
751 | if (!get_device(&cdev->dev)) | |
752 | break; | |
753 | PREPARE_WORK(&cdev->private->kick_work, | |
754 | io_subchannel_register, (void *) cdev); | |
755 | queue_work(slow_path_wq, &cdev->private->kick_work); | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | static int | |
761 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
762 | { | |
763 | int rc; | |
764 | struct ccw_device_private *priv; | |
765 | ||
766 | sch->dev.driver_data = cdev; | |
767 | sch->driver = &io_subchannel_driver; | |
768 | cdev->ccwlock = &sch->lock; | |
fb6958a5 | 769 | |
1da177e4 LT |
770 | /* Init private data. */ |
771 | priv = cdev->private; | |
772 | priv->devno = sch->schib.pmcw.dev; | |
fb6958a5 | 773 | priv->ssid = sch->schid.ssid; |
a8237fc4 | 774 | priv->sch_no = sch->schid.sch_no; |
1da177e4 LT |
775 | priv->state = DEV_STATE_NOT_OPER; |
776 | INIT_LIST_HEAD(&priv->cmb_list); | |
777 | init_waitqueue_head(&priv->wait_q); | |
778 | init_timer(&priv->timer); | |
779 | ||
780 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
781 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
782 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
783 | |
784 | /* Increase counter of devices currently in recognition. */ | |
785 | atomic_inc(&ccw_device_init_count); | |
786 | ||
787 | /* Start async. device sensing. */ | |
788 | spin_lock_irq(&sch->lock); | |
789 | rc = ccw_device_recognition(cdev); | |
790 | spin_unlock_irq(&sch->lock); | |
791 | if (rc) { | |
792 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
793 | wake_up(&ccw_device_init_wq); | |
794 | } | |
795 | return rc; | |
796 | } | |
797 | ||
798 | static int | |
8bbace7e | 799 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 800 | { |
1da177e4 LT |
801 | struct ccw_device *cdev; |
802 | int rc; | |
803 | unsigned long flags; | |
804 | ||
1da177e4 LT |
805 | if (sch->dev.driver_data) { |
806 | /* | |
807 | * This subchannel already has an associated ccw_device. | |
808 | * Register it and exit. This happens for all early | |
809 | * device, e.g. the console. | |
810 | */ | |
811 | cdev = sch->dev.driver_data; | |
812 | device_initialize(&cdev->dev); | |
813 | ccw_device_register(cdev); | |
814 | subchannel_add_files(&sch->dev); | |
815 | /* | |
816 | * Check if the device is already online. If it is | |
817 | * the reference count needs to be corrected | |
818 | * (see ccw_device_online and css_init_done for the | |
819 | * ugly details). | |
820 | */ | |
821 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
822 | cdev->private->state != DEV_STATE_OFFLINE && | |
823 | cdev->private->state != DEV_STATE_BOXED) | |
824 | get_device(&cdev->dev); | |
825 | return 0; | |
826 | } | |
88abaab4 | 827 | cdev = kzalloc (sizeof(*cdev), GFP_KERNEL); |
1da177e4 LT |
828 | if (!cdev) |
829 | return -ENOMEM; | |
88abaab4 | 830 | cdev->private = kzalloc(sizeof(struct ccw_device_private), |
1da177e4 LT |
831 | GFP_KERNEL | GFP_DMA); |
832 | if (!cdev->private) { | |
833 | kfree(cdev); | |
834 | return -ENOMEM; | |
835 | } | |
1da177e4 | 836 | atomic_set(&cdev->private->onoff, 0); |
292888c8 HC |
837 | cdev->dev.parent = &sch->dev; |
838 | cdev->dev.release = ccw_device_release; | |
1da177e4 LT |
839 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); |
840 | /* Do first half of device_register. */ | |
841 | device_initialize(&cdev->dev); | |
842 | ||
843 | if (!get_device(&sch->dev)) { | |
844 | if (cdev->dev.release) | |
845 | cdev->dev.release(&cdev->dev); | |
846 | return -ENODEV; | |
847 | } | |
848 | ||
8bbace7e | 849 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 LT |
850 | if (rc) { |
851 | spin_lock_irqsave(&sch->lock, flags); | |
852 | sch->dev.driver_data = NULL; | |
853 | spin_unlock_irqrestore(&sch->lock, flags); | |
854 | if (cdev->dev.release) | |
855 | cdev->dev.release(&cdev->dev); | |
856 | } | |
857 | ||
858 | return rc; | |
859 | } | |
860 | ||
861 | static void | |
862 | ccw_device_unregister(void *data) | |
863 | { | |
864 | struct ccw_device *cdev; | |
865 | ||
866 | cdev = (struct ccw_device *)data; | |
867 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
868 | device_unregister(&cdev->dev); | |
869 | put_device(&cdev->dev); | |
870 | } | |
871 | ||
872 | static int | |
8bbace7e | 873 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
874 | { |
875 | struct ccw_device *cdev; | |
876 | unsigned long flags; | |
877 | ||
8bbace7e | 878 | if (!sch->dev.driver_data) |
1da177e4 | 879 | return 0; |
8bbace7e | 880 | cdev = sch->dev.driver_data; |
1da177e4 LT |
881 | /* Set ccw device to not operational and drop reference. */ |
882 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 883 | sch->dev.driver_data = NULL; |
1da177e4 LT |
884 | cdev->private->state = DEV_STATE_NOT_OPER; |
885 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
886 | /* | |
887 | * Put unregistration on workqueue to avoid livelocks on the css bus | |
888 | * semaphore. | |
889 | */ | |
890 | if (get_device(&cdev->dev)) { | |
891 | PREPARE_WORK(&cdev->private->kick_work, | |
892 | ccw_device_unregister, (void *) cdev); | |
893 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
894 | } | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static int | |
899 | io_subchannel_notify(struct device *dev, int event) | |
900 | { | |
901 | struct ccw_device *cdev; | |
902 | ||
903 | cdev = dev->driver_data; | |
904 | if (!cdev) | |
905 | return 0; | |
906 | if (!cdev->drv) | |
907 | return 0; | |
908 | if (!cdev->online) | |
909 | return 0; | |
910 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
911 | } | |
912 | ||
913 | static void | |
914 | io_subchannel_verify(struct device *dev) | |
915 | { | |
916 | struct ccw_device *cdev; | |
917 | ||
918 | cdev = dev->driver_data; | |
919 | if (cdev) | |
920 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
921 | } | |
922 | ||
923 | static void | |
924 | io_subchannel_ioterm(struct device *dev) | |
925 | { | |
926 | struct ccw_device *cdev; | |
927 | ||
928 | cdev = dev->driver_data; | |
929 | if (!cdev) | |
930 | return; | |
931 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; | |
932 | if (cdev->handler) | |
933 | cdev->handler(cdev, cdev->private->intparm, | |
934 | ERR_PTR(-EIO)); | |
935 | } | |
936 | ||
937 | static void | |
8bbace7e | 938 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 939 | { |
1da177e4 LT |
940 | struct ccw_device *cdev; |
941 | int ret; | |
942 | ||
8bbace7e | 943 | cdev = sch->dev.driver_data; |
1da177e4 | 944 | |
a8237fc4 | 945 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
946 | return; |
947 | if (!sch->schib.pmcw.ena) | |
948 | /* Nothing to do. */ | |
949 | return; | |
950 | ret = cio_disable_subchannel(sch); | |
951 | if (ret != -EBUSY) | |
952 | /* Subchannel is disabled, we're done. */ | |
953 | return; | |
954 | cdev->private->state = DEV_STATE_QUIESCE; | |
955 | if (cdev->handler) | |
956 | cdev->handler(cdev, cdev->private->intparm, | |
957 | ERR_PTR(-EIO)); | |
958 | ret = ccw_device_cancel_halt_clear(cdev); | |
959 | if (ret == -EBUSY) { | |
960 | ccw_device_set_timeout(cdev, HZ/10); | |
961 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
962 | } | |
963 | cio_disable_subchannel(sch); | |
964 | } | |
965 | ||
966 | #ifdef CONFIG_CCW_CONSOLE | |
967 | static struct ccw_device console_cdev; | |
968 | static struct ccw_device_private console_private; | |
969 | static int console_cdev_in_use; | |
970 | ||
971 | static int | |
972 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
973 | { | |
974 | int rc; | |
975 | ||
976 | /* Initialize the ccw_device structure. */ | |
292888c8 | 977 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
978 | rc = io_subchannel_recog(cdev, sch); |
979 | if (rc) | |
980 | return rc; | |
981 | ||
982 | /* Now wait for the async. recognition to come to an end. */ | |
983 | spin_lock_irq(cdev->ccwlock); | |
984 | while (!dev_fsm_final_state(cdev)) | |
985 | wait_cons_dev(); | |
986 | rc = -EIO; | |
987 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
988 | goto out_unlock; | |
989 | ccw_device_online(cdev); | |
990 | while (!dev_fsm_final_state(cdev)) | |
991 | wait_cons_dev(); | |
992 | if (cdev->private->state != DEV_STATE_ONLINE) | |
993 | goto out_unlock; | |
994 | rc = 0; | |
995 | out_unlock: | |
996 | spin_unlock_irq(cdev->ccwlock); | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | struct ccw_device * | |
1001 | ccw_device_probe_console(void) | |
1002 | { | |
1003 | struct subchannel *sch; | |
1004 | int ret; | |
1005 | ||
1006 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1007 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1008 | sch = cio_probe_console(); |
1009 | if (IS_ERR(sch)) { | |
1010 | console_cdev_in_use = 0; | |
1011 | return (void *) sch; | |
1012 | } | |
1013 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1014 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1015 | console_cdev.private = &console_private; | |
1016 | ret = ccw_device_console_enable(&console_cdev, sch); | |
1017 | if (ret) { | |
1018 | cio_release_console(); | |
1019 | console_cdev_in_use = 0; | |
1020 | return ERR_PTR(ret); | |
1021 | } | |
1022 | console_cdev.online = 1; | |
1023 | return &console_cdev; | |
1024 | } | |
1025 | #endif | |
1026 | ||
1027 | /* | |
1028 | * get ccw_device matching the busid, but only if owned by cdrv | |
1029 | */ | |
b0744bd2 CH |
1030 | static int |
1031 | __ccwdev_check_busid(struct device *dev, void *id) | |
1032 | { | |
1033 | char *bus_id; | |
1034 | ||
1035 | bus_id = (char *)id; | |
1036 | ||
1037 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1038 | } | |
1039 | ||
1040 | ||
1da177e4 LT |
1041 | struct ccw_device * |
1042 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) | |
1043 | { | |
b0744bd2 | 1044 | struct device *dev; |
1da177e4 LT |
1045 | struct device_driver *drv; |
1046 | ||
1047 | drv = get_driver(&cdrv->driver); | |
1048 | if (!drv) | |
b0744bd2 | 1049 | return NULL; |
1da177e4 | 1050 | |
b0744bd2 CH |
1051 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1052 | __ccwdev_check_busid); | |
1da177e4 LT |
1053 | put_driver(drv); |
1054 | ||
d2c993d8 | 1055 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | /************************** device driver handling ************************/ | |
1059 | ||
1060 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1061 | * and release methods are initially very similar to the device_driver | |
1062 | * implementations, with the difference that they have ccw_device | |
1063 | * arguments. | |
1064 | * | |
1065 | * A ccw driver also contains the information that is needed for | |
1066 | * device matching. | |
1067 | */ | |
1068 | static int | |
1069 | ccw_device_probe (struct device *dev) | |
1070 | { | |
1071 | struct ccw_device *cdev = to_ccwdev(dev); | |
1072 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1073 | int ret; | |
1074 | ||
1075 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1076 | ||
1077 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1078 | ||
1079 | if (ret) { | |
d2c993d8 | 1080 | cdev->drv = NULL; |
1da177e4 LT |
1081 | return ret; |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | static int | |
1088 | ccw_device_remove (struct device *dev) | |
1089 | { | |
1090 | struct ccw_device *cdev = to_ccwdev(dev); | |
1091 | struct ccw_driver *cdrv = cdev->drv; | |
1092 | int ret; | |
1093 | ||
1094 | pr_debug("removing device %s\n", cdev->dev.bus_id); | |
1095 | if (cdrv->remove) | |
1096 | cdrv->remove(cdev); | |
1097 | if (cdev->online) { | |
1098 | cdev->online = 0; | |
1099 | spin_lock_irq(cdev->ccwlock); | |
1100 | ret = ccw_device_offline(cdev); | |
1101 | spin_unlock_irq(cdev->ccwlock); | |
1102 | if (ret == 0) | |
1103 | wait_event(cdev->private->wait_q, | |
1104 | dev_fsm_final_state(cdev)); | |
1105 | else | |
1106 | //FIXME: we can't fail! | |
1107 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
1108 | ret, cdev->dev.bus_id); | |
1109 | } | |
1110 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1111 | cdev->drv = NULL; |
1da177e4 LT |
1112 | return 0; |
1113 | } | |
1114 | ||
8bbace7e CH |
1115 | struct bus_type ccw_bus_type = { |
1116 | .name = "ccw", | |
1117 | .match = ccw_bus_match, | |
1118 | .uevent = ccw_uevent, | |
1119 | .probe = ccw_device_probe, | |
1120 | .remove = ccw_device_remove, | |
1121 | }; | |
1122 | ||
1da177e4 LT |
1123 | int |
1124 | ccw_driver_register (struct ccw_driver *cdriver) | |
1125 | { | |
1126 | struct device_driver *drv = &cdriver->driver; | |
1127 | ||
1128 | drv->bus = &ccw_bus_type; | |
1129 | drv->name = cdriver->name; | |
1da177e4 LT |
1130 | |
1131 | return driver_register(drv); | |
1132 | } | |
1133 | ||
1134 | void | |
1135 | ccw_driver_unregister (struct ccw_driver *cdriver) | |
1136 | { | |
1137 | driver_unregister(&cdriver->driver); | |
1138 | } | |
1139 | ||
a8237fc4 CH |
1140 | /* Helper func for qdio. */ |
1141 | struct subchannel_id | |
1142 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1143 | { | |
1144 | struct subchannel *sch; | |
1145 | ||
1146 | sch = to_subchannel(cdev->dev.parent); | |
1147 | return sch->schid; | |
1148 | } | |
1149 | ||
1da177e4 LT |
1150 | MODULE_LICENSE("GPL"); |
1151 | EXPORT_SYMBOL(ccw_device_set_online); | |
1152 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1153 | EXPORT_SYMBOL(ccw_driver_register); | |
1154 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1155 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1156 | EXPORT_SYMBOL(ccw_bus_type); | |
1157 | EXPORT_SYMBOL(ccw_device_work); | |
1158 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1159 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |