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Commit | Line | Data |
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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 | ||
db0c2d59 PO |
55 | /* Store modalias string delimited by prefix/suffix string into buffer with |
56 | * specified size. Return length of resulting string (excluding trailing '\0') | |
57 | * even if string doesn't fit buffer (snprintf semantics). */ | |
58 | static int snprint_alias(char *buf, size_t size, const char *prefix, | |
59 | struct ccw_device_id *id, const char *suffix) | |
1da177e4 | 60 | { |
db0c2d59 | 61 | int len; |
1da177e4 | 62 | |
db0c2d59 PO |
63 | len = snprintf(buf, size, "%sccw:t%04Xm%02X", prefix, id->cu_type, |
64 | id->cu_model); | |
65 | if (len > size) | |
66 | return len; | |
67 | buf += len; | |
68 | size -= len; | |
1da177e4 | 69 | |
db0c2d59 PO |
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); | |
1da177e4 | 75 | |
db0c2d59 PO |
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; | |
1da177e4 | 88 | |
db0c2d59 PO |
89 | /* CU_TYPE= */ |
90 | len = snprintf(buffer, buffer_size, "CU_TYPE=%04X", id->cu_type) + 1; | |
91 | if (len > buffer_size || i >= num_envp) | |
92 | return -ENOMEM; | |
1da177e4 | 93 | envp[i++] = buffer; |
db0c2d59 PO |
94 | buffer += len; |
95 | buffer_size -= len; | |
96 | ||
97 | /* CU_MODEL= */ | |
98 | len = snprintf(buffer, buffer_size, "CU_MODEL=%02X", id->cu_model) + 1; | |
99 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 100 | return -ENOMEM; |
db0c2d59 PO |
101 | envp[i++] = buffer; |
102 | buffer += len; | |
103 | buffer_size -= len; | |
1da177e4 LT |
104 | |
105 | /* The next two can be zero, that's ok for us */ | |
db0c2d59 PO |
106 | /* DEV_TYPE= */ |
107 | len = snprintf(buffer, buffer_size, "DEV_TYPE=%04X", id->dev_type) + 1; | |
108 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 109 | return -ENOMEM; |
db0c2d59 PO |
110 | envp[i++] = buffer; |
111 | buffer += len; | |
112 | buffer_size -= len; | |
1da177e4 | 113 | |
db0c2d59 PO |
114 | /* DEV_MODEL= */ |
115 | len = snprintf(buffer, buffer_size, "DEV_MODEL=%02X", | |
116 | (unsigned char) id->dev_model) + 1; | |
117 | if (len > buffer_size || i >= num_envp) | |
118 | return -ENOMEM; | |
1da177e4 | 119 | envp[i++] = buffer; |
db0c2d59 PO |
120 | buffer += len; |
121 | buffer_size -= len; | |
122 | ||
123 | /* MODALIAS= */ | |
124 | len = snprint_alias(buffer, buffer_size, "MODALIAS=", id, "") + 1; | |
125 | if (len > buffer_size || i >= num_envp) | |
1da177e4 | 126 | return -ENOMEM; |
db0c2d59 PO |
127 | envp[i++] = buffer; |
128 | buffer += len; | |
129 | buffer_size -= len; | |
1da177e4 | 130 | |
d2c993d8 | 131 | envp[i] = NULL; |
1da177e4 LT |
132 | |
133 | return 0; | |
134 | } | |
135 | ||
8bbace7e | 136 | struct bus_type ccw_bus_type; |
1da177e4 | 137 | |
8bbace7e CH |
138 | static int io_subchannel_probe (struct subchannel *); |
139 | static int io_subchannel_remove (struct subchannel *); | |
1da177e4 LT |
140 | void io_subchannel_irq (struct device *); |
141 | static int io_subchannel_notify(struct device *, int); | |
142 | static void io_subchannel_verify(struct device *); | |
143 | static void io_subchannel_ioterm(struct device *); | |
8bbace7e | 144 | static void io_subchannel_shutdown(struct subchannel *); |
1da177e4 LT |
145 | |
146 | struct css_driver io_subchannel_driver = { | |
147 | .subchannel_type = SUBCHANNEL_TYPE_IO, | |
148 | .drv = { | |
149 | .name = "io_subchannel", | |
150 | .bus = &css_bus_type, | |
1da177e4 LT |
151 | }, |
152 | .irq = io_subchannel_irq, | |
153 | .notify = io_subchannel_notify, | |
154 | .verify = io_subchannel_verify, | |
155 | .termination = io_subchannel_ioterm, | |
8bbace7e CH |
156 | .probe = io_subchannel_probe, |
157 | .remove = io_subchannel_remove, | |
158 | .shutdown = io_subchannel_shutdown, | |
1da177e4 LT |
159 | }; |
160 | ||
161 | struct workqueue_struct *ccw_device_work; | |
162 | struct workqueue_struct *ccw_device_notify_work; | |
40154b82 PO |
163 | wait_queue_head_t ccw_device_init_wq; |
164 | atomic_t ccw_device_init_count; | |
1da177e4 LT |
165 | |
166 | static int __init | |
167 | init_ccw_bus_type (void) | |
168 | { | |
169 | int ret; | |
170 | ||
171 | init_waitqueue_head(&ccw_device_init_wq); | |
172 | atomic_set(&ccw_device_init_count, 0); | |
173 | ||
174 | ccw_device_work = create_singlethread_workqueue("cio"); | |
175 | if (!ccw_device_work) | |
176 | return -ENOMEM; /* FIXME: better errno ? */ | |
177 | ccw_device_notify_work = create_singlethread_workqueue("cio_notify"); | |
178 | if (!ccw_device_notify_work) { | |
179 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
180 | goto out_err; | |
181 | } | |
182 | slow_path_wq = create_singlethread_workqueue("kslowcrw"); | |
183 | if (!slow_path_wq) { | |
184 | ret = -ENOMEM; /* FIXME: better errno ? */ | |
185 | goto out_err; | |
186 | } | |
187 | if ((ret = bus_register (&ccw_bus_type))) | |
188 | goto out_err; | |
189 | ||
190 | if ((ret = driver_register(&io_subchannel_driver.drv))) | |
191 | goto out_err; | |
192 | ||
193 | wait_event(ccw_device_init_wq, | |
194 | atomic_read(&ccw_device_init_count) == 0); | |
195 | flush_workqueue(ccw_device_work); | |
196 | return 0; | |
197 | out_err: | |
198 | if (ccw_device_work) | |
199 | destroy_workqueue(ccw_device_work); | |
200 | if (ccw_device_notify_work) | |
201 | destroy_workqueue(ccw_device_notify_work); | |
202 | if (slow_path_wq) | |
203 | destroy_workqueue(slow_path_wq); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static void __exit | |
208 | cleanup_ccw_bus_type (void) | |
209 | { | |
210 | driver_unregister(&io_subchannel_driver.drv); | |
211 | bus_unregister(&ccw_bus_type); | |
212 | destroy_workqueue(ccw_device_notify_work); | |
213 | destroy_workqueue(ccw_device_work); | |
214 | } | |
215 | ||
216 | subsys_initcall(init_ccw_bus_type); | |
217 | module_exit(cleanup_ccw_bus_type); | |
218 | ||
219 | /************************ device handling **************************/ | |
220 | ||
221 | /* | |
222 | * A ccw_device has some interfaces in sysfs in addition to the | |
223 | * standard ones. | |
224 | * The following entries are designed to export the information which | |
225 | * resided in 2.4 in /proc/subchannels. Subchannel and device number | |
226 | * are obvious, so they don't have an entry :) | |
227 | * TODO: Split chpids and pimpampom up? Where is "in use" in the tree? | |
228 | */ | |
229 | static ssize_t | |
3fd3c0a5 | 230 | chpids_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
231 | { |
232 | struct subchannel *sch = to_subchannel(dev); | |
233 | struct ssd_info *ssd = &sch->ssd_info; | |
234 | ssize_t ret = 0; | |
235 | int chp; | |
236 | ||
237 | for (chp = 0; chp < 8; chp++) | |
238 | ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]); | |
239 | ||
240 | ret += sprintf (buf+ret, "\n"); | |
241 | return min((ssize_t)PAGE_SIZE, ret); | |
242 | } | |
243 | ||
244 | static ssize_t | |
3fd3c0a5 | 245 | pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf) |
1da177e4 LT |
246 | { |
247 | struct subchannel *sch = to_subchannel(dev); | |
248 | struct pmcw *pmcw = &sch->schib.pmcw; | |
249 | ||
250 | return sprintf (buf, "%02x %02x %02x\n", | |
251 | pmcw->pim, pmcw->pam, pmcw->pom); | |
252 | } | |
253 | ||
254 | static ssize_t | |
3fd3c0a5 | 255 | devtype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
256 | { |
257 | struct ccw_device *cdev = to_ccwdev(dev); | |
258 | struct ccw_device_id *id = &(cdev->id); | |
259 | ||
260 | if (id->dev_type != 0) | |
261 | return sprintf(buf, "%04x/%02x\n", | |
262 | id->dev_type, id->dev_model); | |
263 | else | |
264 | return sprintf(buf, "n/a\n"); | |
265 | } | |
266 | ||
267 | static ssize_t | |
3fd3c0a5 | 268 | cutype_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
269 | { |
270 | struct ccw_device *cdev = to_ccwdev(dev); | |
271 | struct ccw_device_id *id = &(cdev->id); | |
272 | ||
273 | return sprintf(buf, "%04x/%02x\n", | |
274 | id->cu_type, id->cu_model); | |
275 | } | |
276 | ||
f1fc78a8 BB |
277 | static ssize_t |
278 | modalias_show (struct device *dev, struct device_attribute *attr, char *buf) | |
279 | { | |
280 | struct ccw_device *cdev = to_ccwdev(dev); | |
281 | struct ccw_device_id *id = &(cdev->id); | |
db0c2d59 | 282 | int len; |
f1fc78a8 | 283 | |
db0c2d59 PO |
284 | len = snprint_alias(buf, PAGE_SIZE, "", id, "\n") + 1; |
285 | ||
286 | return len > PAGE_SIZE ? PAGE_SIZE : len; | |
f1fc78a8 BB |
287 | } |
288 | ||
1da177e4 | 289 | static ssize_t |
3fd3c0a5 | 290 | online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
291 | { |
292 | struct ccw_device *cdev = to_ccwdev(dev); | |
293 | ||
294 | return sprintf(buf, cdev->online ? "1\n" : "0\n"); | |
295 | } | |
296 | ||
297 | static void | |
298 | ccw_device_remove_disconnected(struct ccw_device *cdev) | |
299 | { | |
300 | struct subchannel *sch; | |
301 | /* | |
302 | * Forced offline in disconnected state means | |
303 | * 'throw away device'. | |
304 | */ | |
305 | sch = to_subchannel(cdev->dev.parent); | |
6ab4879a | 306 | css_sch_device_unregister(sch); |
1da177e4 LT |
307 | /* Reset intparm to zeroes. */ |
308 | sch->schib.pmcw.intparm = 0; | |
309 | cio_modify(sch); | |
310 | put_device(&sch->dev); | |
311 | } | |
312 | ||
313 | int | |
314 | ccw_device_set_offline(struct ccw_device *cdev) | |
315 | { | |
316 | int ret; | |
317 | ||
318 | if (!cdev) | |
319 | return -ENODEV; | |
320 | if (!cdev->online || !cdev->drv) | |
321 | return -EINVAL; | |
322 | ||
323 | if (cdev->drv->set_offline) { | |
324 | ret = cdev->drv->set_offline(cdev); | |
325 | if (ret != 0) | |
326 | return ret; | |
327 | } | |
328 | cdev->online = 0; | |
329 | spin_lock_irq(cdev->ccwlock); | |
330 | ret = ccw_device_offline(cdev); | |
331 | if (ret == -ENODEV) { | |
332 | if (cdev->private->state != DEV_STATE_NOT_OPER) { | |
333 | cdev->private->state = DEV_STATE_OFFLINE; | |
334 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
335 | } | |
336 | spin_unlock_irq(cdev->ccwlock); | |
337 | return ret; | |
338 | } | |
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_offline returned %d, device %s\n", | |
344 | ret, cdev->dev.bus_id); | |
345 | cdev->online = 1; | |
346 | } | |
347 | return ret; | |
348 | } | |
349 | ||
350 | int | |
351 | ccw_device_set_online(struct ccw_device *cdev) | |
352 | { | |
353 | int ret; | |
354 | ||
355 | if (!cdev) | |
356 | return -ENODEV; | |
357 | if (cdev->online || !cdev->drv) | |
358 | return -EINVAL; | |
359 | ||
360 | spin_lock_irq(cdev->ccwlock); | |
361 | ret = ccw_device_online(cdev); | |
362 | spin_unlock_irq(cdev->ccwlock); | |
363 | if (ret == 0) | |
364 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
365 | else { | |
366 | pr_debug("ccw_device_online returned %d, device %s\n", | |
367 | ret, cdev->dev.bus_id); | |
368 | return ret; | |
369 | } | |
370 | if (cdev->private->state != DEV_STATE_ONLINE) | |
371 | return -ENODEV; | |
372 | if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) { | |
373 | cdev->online = 1; | |
374 | return 0; | |
375 | } | |
376 | spin_lock_irq(cdev->ccwlock); | |
377 | ret = ccw_device_offline(cdev); | |
378 | spin_unlock_irq(cdev->ccwlock); | |
379 | if (ret == 0) | |
380 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
381 | else | |
382 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
383 | ret, cdev->dev.bus_id); | |
6cadb78b | 384 | return (ret == 0) ? -ENODEV : ret; |
1da177e4 LT |
385 | } |
386 | ||
387 | static ssize_t | |
3fd3c0a5 | 388 | online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
389 | { |
390 | struct ccw_device *cdev = to_ccwdev(dev); | |
391 | int i, force, ret; | |
392 | char *tmp; | |
393 | ||
973bd993 | 394 | if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0) |
1da177e4 LT |
395 | return -EAGAIN; |
396 | ||
397 | if (cdev->drv && !try_module_get(cdev->drv->owner)) { | |
398 | atomic_set(&cdev->private->onoff, 0); | |
399 | return -EINVAL; | |
400 | } | |
401 | if (!strncmp(buf, "force\n", count)) { | |
402 | force = 1; | |
403 | i = 1; | |
404 | } else { | |
405 | force = 0; | |
406 | i = simple_strtoul(buf, &tmp, 16); | |
407 | } | |
408 | if (i == 1) { | |
409 | /* Do device recognition, if needed. */ | |
410 | if (cdev->id.cu_type == 0) { | |
411 | ret = ccw_device_recognition(cdev); | |
412 | if (ret) { | |
413 | printk(KERN_WARNING"Couldn't start recognition " | |
414 | "for device %s (ret=%d)\n", | |
415 | cdev->dev.bus_id, ret); | |
416 | goto out; | |
417 | } | |
418 | wait_event(cdev->private->wait_q, | |
419 | cdev->private->flags.recog_done); | |
420 | } | |
421 | if (cdev->drv && cdev->drv->set_online) | |
422 | ccw_device_set_online(cdev); | |
423 | } else if (i == 0) { | |
424 | if (cdev->private->state == DEV_STATE_DISCONNECTED) | |
425 | ccw_device_remove_disconnected(cdev); | |
426 | else if (cdev->drv && cdev->drv->set_offline) | |
427 | ccw_device_set_offline(cdev); | |
428 | } | |
429 | if (force && cdev->private->state == DEV_STATE_BOXED) { | |
430 | ret = ccw_device_stlck(cdev); | |
431 | if (ret) { | |
432 | printk(KERN_WARNING"ccw_device_stlck for device %s " | |
433 | "returned %d!\n", cdev->dev.bus_id, ret); | |
434 | goto out; | |
435 | } | |
436 | /* Do device recognition, if needed. */ | |
437 | if (cdev->id.cu_type == 0) { | |
438 | cdev->private->state = DEV_STATE_NOT_OPER; | |
439 | ret = ccw_device_recognition(cdev); | |
440 | if (ret) { | |
441 | printk(KERN_WARNING"Couldn't start recognition " | |
442 | "for device %s (ret=%d)\n", | |
443 | cdev->dev.bus_id, ret); | |
444 | goto out; | |
445 | } | |
446 | wait_event(cdev->private->wait_q, | |
447 | cdev->private->flags.recog_done); | |
448 | } | |
449 | if (cdev->drv && cdev->drv->set_online) | |
450 | ccw_device_set_online(cdev); | |
451 | } | |
452 | out: | |
453 | if (cdev->drv) | |
454 | module_put(cdev->drv->owner); | |
455 | atomic_set(&cdev->private->onoff, 0); | |
456 | return count; | |
457 | } | |
458 | ||
459 | static ssize_t | |
3fd3c0a5 | 460 | available_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
461 | { |
462 | struct ccw_device *cdev = to_ccwdev(dev); | |
463 | struct subchannel *sch; | |
464 | ||
465 | switch (cdev->private->state) { | |
466 | case DEV_STATE_BOXED: | |
467 | return sprintf(buf, "boxed\n"); | |
468 | case DEV_STATE_DISCONNECTED: | |
469 | case DEV_STATE_DISCONNECTED_SENSE_ID: | |
470 | case DEV_STATE_NOT_OPER: | |
471 | sch = to_subchannel(dev->parent); | |
472 | if (!sch->lpm) | |
473 | return sprintf(buf, "no path\n"); | |
474 | else | |
475 | return sprintf(buf, "no device\n"); | |
476 | default: | |
477 | /* All other states considered fine. */ | |
478 | return sprintf(buf, "good\n"); | |
479 | } | |
480 | } | |
481 | ||
482 | static DEVICE_ATTR(chpids, 0444, chpids_show, NULL); | |
483 | static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL); | |
484 | static DEVICE_ATTR(devtype, 0444, devtype_show, NULL); | |
485 | static DEVICE_ATTR(cutype, 0444, cutype_show, NULL); | |
f1fc78a8 | 486 | static DEVICE_ATTR(modalias, 0444, modalias_show, NULL); |
1da177e4 LT |
487 | static DEVICE_ATTR(online, 0644, online_show, online_store); |
488 | extern struct device_attribute dev_attr_cmb_enable; | |
489 | static DEVICE_ATTR(availability, 0444, available_show, NULL); | |
490 | ||
491 | static struct attribute * subch_attrs[] = { | |
492 | &dev_attr_chpids.attr, | |
493 | &dev_attr_pimpampom.attr, | |
494 | NULL, | |
495 | }; | |
496 | ||
497 | static struct attribute_group subch_attr_group = { | |
498 | .attrs = subch_attrs, | |
499 | }; | |
500 | ||
501 | static inline int | |
502 | subchannel_add_files (struct device *dev) | |
503 | { | |
504 | return sysfs_create_group(&dev->kobj, &subch_attr_group); | |
505 | } | |
506 | ||
507 | static struct attribute * ccwdev_attrs[] = { | |
508 | &dev_attr_devtype.attr, | |
509 | &dev_attr_cutype.attr, | |
f1fc78a8 | 510 | &dev_attr_modalias.attr, |
1da177e4 LT |
511 | &dev_attr_online.attr, |
512 | &dev_attr_cmb_enable.attr, | |
513 | &dev_attr_availability.attr, | |
514 | NULL, | |
515 | }; | |
516 | ||
517 | static struct attribute_group ccwdev_attr_group = { | |
518 | .attrs = ccwdev_attrs, | |
519 | }; | |
520 | ||
521 | static inline int | |
522 | device_add_files (struct device *dev) | |
523 | { | |
524 | return sysfs_create_group(&dev->kobj, &ccwdev_attr_group); | |
525 | } | |
526 | ||
527 | static inline void | |
528 | device_remove_files(struct device *dev) | |
529 | { | |
530 | sysfs_remove_group(&dev->kobj, &ccwdev_attr_group); | |
531 | } | |
532 | ||
533 | /* this is a simple abstraction for device_register that sets the | |
534 | * correct bus type and adds the bus specific files */ | |
3c9da7ba | 535 | static int ccw_device_register(struct ccw_device *cdev) |
1da177e4 LT |
536 | { |
537 | struct device *dev = &cdev->dev; | |
538 | int ret; | |
539 | ||
540 | dev->bus = &ccw_bus_type; | |
541 | ||
542 | if ((ret = device_add(dev))) | |
543 | return ret; | |
544 | ||
545 | set_bit(1, &cdev->private->registered); | |
546 | if ((ret = device_add_files(dev))) { | |
547 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
548 | device_del(dev); | |
549 | } | |
550 | return ret; | |
551 | } | |
552 | ||
b0744bd2 | 553 | struct match_data { |
78964268 | 554 | struct ccw_dev_id dev_id; |
b0744bd2 CH |
555 | struct ccw_device * sibling; |
556 | }; | |
557 | ||
558 | static int | |
559 | match_devno(struct device * dev, void * data) | |
560 | { | |
78964268 | 561 | struct match_data * d = data; |
b0744bd2 CH |
562 | struct ccw_device * cdev; |
563 | ||
564 | cdev = to_ccwdev(dev); | |
565 | if ((cdev->private->state == DEV_STATE_DISCONNECTED) && | |
78964268 | 566 | ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) && |
b0744bd2 CH |
567 | (cdev != d->sibling)) { |
568 | cdev->private->state = DEV_STATE_NOT_OPER; | |
569 | return 1; | |
570 | } | |
571 | return 0; | |
572 | } | |
573 | ||
78964268 CH |
574 | static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id, |
575 | struct ccw_device *sibling) | |
1da177e4 | 576 | { |
1da177e4 | 577 | struct device *dev; |
292888c8 | 578 | struct match_data data; |
1da177e4 | 579 | |
78964268 | 580 | data.dev_id = *dev_id; |
292888c8 | 581 | data.sibling = sibling; |
e5945b4f | 582 | dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno); |
1da177e4 | 583 | |
b0744bd2 | 584 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
585 | } |
586 | ||
587 | static void | |
588 | ccw_device_add_changed(void *data) | |
589 | { | |
590 | ||
591 | struct ccw_device *cdev; | |
592 | ||
12975aef | 593 | cdev = data; |
1da177e4 LT |
594 | if (device_add(&cdev->dev)) { |
595 | put_device(&cdev->dev); | |
596 | return; | |
597 | } | |
598 | set_bit(1, &cdev->private->registered); | |
599 | if (device_add_files(&cdev->dev)) { | |
600 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
601 | device_unregister(&cdev->dev); | |
602 | } | |
603 | } | |
604 | ||
605 | extern int css_get_ssd_info(struct subchannel *sch); | |
606 | ||
607 | void | |
608 | ccw_device_do_unreg_rereg(void *data) | |
609 | { | |
610 | struct ccw_device *cdev; | |
611 | struct subchannel *sch; | |
612 | int need_rename; | |
613 | ||
12975aef | 614 | cdev = data; |
1da177e4 | 615 | sch = to_subchannel(cdev->dev.parent); |
78964268 | 616 | if (cdev->private->dev_id.devno != sch->schib.pmcw.dev) { |
1da177e4 LT |
617 | /* |
618 | * The device number has changed. This is usually only when | |
619 | * a device has been detached under VM and then re-appeared | |
620 | * on another subchannel because of a different attachment | |
621 | * order than before. Ideally, we should should just switch | |
622 | * subchannels, but unfortunately, this is not possible with | |
623 | * the current implementation. | |
624 | * Instead, we search for the old subchannel for this device | |
625 | * number and deregister so there are no collisions with the | |
626 | * newly registered ccw_device. | |
627 | * FIXME: Find another solution so the block layer doesn't | |
628 | * get possibly sick... | |
629 | */ | |
630 | struct ccw_device *other_cdev; | |
78964268 | 631 | struct ccw_dev_id dev_id; |
1da177e4 LT |
632 | |
633 | need_rename = 1; | |
78964268 CH |
634 | dev_id.devno = sch->schib.pmcw.dev; |
635 | dev_id.ssid = sch->schid.ssid; | |
636 | other_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev); | |
1da177e4 LT |
637 | if (other_cdev) { |
638 | struct subchannel *other_sch; | |
639 | ||
640 | other_sch = to_subchannel(other_cdev->dev.parent); | |
641 | if (get_device(&other_sch->dev)) { | |
a8237fc4 | 642 | stsch(other_sch->schid, &other_sch->schib); |
1da177e4 LT |
643 | if (other_sch->schib.pmcw.dnv) { |
644 | other_sch->schib.pmcw.intparm = 0; | |
645 | cio_modify(other_sch); | |
646 | } | |
6ab4879a | 647 | css_sch_device_unregister(other_sch); |
1da177e4 LT |
648 | } |
649 | } | |
650 | /* Update ssd info here. */ | |
651 | css_get_ssd_info(sch); | |
78964268 | 652 | cdev->private->dev_id.devno = sch->schib.pmcw.dev; |
1da177e4 LT |
653 | } else |
654 | need_rename = 0; | |
655 | device_remove_files(&cdev->dev); | |
656 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
657 | device_del(&cdev->dev); | |
658 | if (need_rename) | |
fb6958a5 CH |
659 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
660 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 | 661 | PREPARE_WORK(&cdev->private->kick_work, |
12975aef | 662 | ccw_device_add_changed, cdev); |
1da177e4 LT |
663 | queue_work(ccw_device_work, &cdev->private->kick_work); |
664 | } | |
665 | ||
666 | static void | |
667 | ccw_device_release(struct device *dev) | |
668 | { | |
669 | struct ccw_device *cdev; | |
670 | ||
671 | cdev = to_ccwdev(dev); | |
672 | kfree(cdev->private); | |
673 | kfree(cdev); | |
674 | } | |
675 | ||
676 | /* | |
677 | * Register recognized device. | |
678 | */ | |
679 | static void | |
680 | io_subchannel_register(void *data) | |
681 | { | |
682 | struct ccw_device *cdev; | |
683 | struct subchannel *sch; | |
684 | int ret; | |
685 | unsigned long flags; | |
686 | ||
12975aef | 687 | cdev = data; |
1da177e4 LT |
688 | sch = to_subchannel(cdev->dev.parent); |
689 | ||
47af5518 CH |
690 | /* |
691 | * io_subchannel_register() will also be called after device | |
692 | * recognition has been done for a boxed device (which will already | |
693 | * be registered). We need to reprobe since we may now have sense id | |
694 | * information. | |
695 | */ | |
b0744bd2 | 696 | if (klist_node_attached(&cdev->dev.knode_parent)) { |
47af5518 CH |
697 | if (!cdev->drv) { |
698 | ret = device_reprobe(&cdev->dev); | |
699 | if (ret) | |
700 | /* We can't do much here. */ | |
701 | dev_info(&cdev->dev, "device_reprobe() returned" | |
702 | " %d\n", ret); | |
703 | } | |
1da177e4 LT |
704 | goto out; |
705 | } | |
706 | /* make it known to the system */ | |
707 | ret = ccw_device_register(cdev); | |
708 | if (ret) { | |
709 | printk (KERN_WARNING "%s: could not register %s\n", | |
710 | __func__, cdev->dev.bus_id); | |
711 | put_device(&cdev->dev); | |
712 | spin_lock_irqsave(&sch->lock, flags); | |
713 | sch->dev.driver_data = NULL; | |
714 | spin_unlock_irqrestore(&sch->lock, flags); | |
715 | kfree (cdev->private); | |
716 | kfree (cdev); | |
717 | put_device(&sch->dev); | |
718 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
719 | wake_up(&ccw_device_init_wq); | |
720 | return; | |
721 | } | |
722 | ||
723 | ret = subchannel_add_files(cdev->dev.parent); | |
724 | if (ret) | |
725 | printk(KERN_WARNING "%s: could not add attributes to %s\n", | |
726 | __func__, sch->dev.bus_id); | |
727 | put_device(&cdev->dev); | |
728 | out: | |
729 | cdev->private->flags.recog_done = 1; | |
730 | put_device(&sch->dev); | |
731 | wake_up(&cdev->private->wait_q); | |
732 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
733 | wake_up(&ccw_device_init_wq); | |
734 | } | |
735 | ||
736 | void | |
737 | ccw_device_call_sch_unregister(void *data) | |
738 | { | |
739 | struct ccw_device *cdev = data; | |
740 | struct subchannel *sch; | |
741 | ||
742 | sch = to_subchannel(cdev->dev.parent); | |
6ab4879a | 743 | css_sch_device_unregister(sch); |
1da177e4 LT |
744 | /* Reset intparm to zeroes. */ |
745 | sch->schib.pmcw.intparm = 0; | |
746 | cio_modify(sch); | |
747 | put_device(&cdev->dev); | |
748 | put_device(&sch->dev); | |
749 | } | |
750 | ||
751 | /* | |
752 | * subchannel recognition done. Called from the state machine. | |
753 | */ | |
754 | void | |
755 | io_subchannel_recog_done(struct ccw_device *cdev) | |
756 | { | |
757 | struct subchannel *sch; | |
758 | ||
759 | if (css_init_done == 0) { | |
760 | cdev->private->flags.recog_done = 1; | |
761 | return; | |
762 | } | |
763 | switch (cdev->private->state) { | |
764 | case DEV_STATE_NOT_OPER: | |
765 | cdev->private->flags.recog_done = 1; | |
766 | /* Remove device found not operational. */ | |
767 | if (!get_device(&cdev->dev)) | |
768 | break; | |
769 | sch = to_subchannel(cdev->dev.parent); | |
770 | PREPARE_WORK(&cdev->private->kick_work, | |
12975aef | 771 | ccw_device_call_sch_unregister, cdev); |
1da177e4 LT |
772 | queue_work(slow_path_wq, &cdev->private->kick_work); |
773 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
774 | wake_up(&ccw_device_init_wq); | |
775 | break; | |
776 | case DEV_STATE_BOXED: | |
777 | /* Device did not respond in time. */ | |
778 | case DEV_STATE_OFFLINE: | |
779 | /* | |
780 | * We can't register the device in interrupt context so | |
781 | * we schedule a work item. | |
782 | */ | |
783 | if (!get_device(&cdev->dev)) | |
784 | break; | |
785 | PREPARE_WORK(&cdev->private->kick_work, | |
12975aef | 786 | io_subchannel_register, cdev); |
1da177e4 LT |
787 | queue_work(slow_path_wq, &cdev->private->kick_work); |
788 | break; | |
789 | } | |
790 | } | |
791 | ||
792 | static int | |
793 | io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch) | |
794 | { | |
795 | int rc; | |
796 | struct ccw_device_private *priv; | |
797 | ||
798 | sch->dev.driver_data = cdev; | |
799 | sch->driver = &io_subchannel_driver; | |
800 | cdev->ccwlock = &sch->lock; | |
fb6958a5 | 801 | |
1da177e4 LT |
802 | /* Init private data. */ |
803 | priv = cdev->private; | |
78964268 CH |
804 | priv->dev_id.devno = sch->schib.pmcw.dev; |
805 | priv->dev_id.ssid = sch->schid.ssid; | |
806 | priv->schid = sch->schid; | |
1da177e4 LT |
807 | priv->state = DEV_STATE_NOT_OPER; |
808 | INIT_LIST_HEAD(&priv->cmb_list); | |
809 | init_waitqueue_head(&priv->wait_q); | |
810 | init_timer(&priv->timer); | |
811 | ||
812 | /* Set an initial name for the device. */ | |
fb6958a5 CH |
813 | snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", |
814 | sch->schid.ssid, sch->schib.pmcw.dev); | |
1da177e4 LT |
815 | |
816 | /* Increase counter of devices currently in recognition. */ | |
817 | atomic_inc(&ccw_device_init_count); | |
818 | ||
819 | /* Start async. device sensing. */ | |
820 | spin_lock_irq(&sch->lock); | |
821 | rc = ccw_device_recognition(cdev); | |
822 | spin_unlock_irq(&sch->lock); | |
823 | if (rc) { | |
824 | if (atomic_dec_and_test(&ccw_device_init_count)) | |
825 | wake_up(&ccw_device_init_wq); | |
826 | } | |
827 | return rc; | |
828 | } | |
829 | ||
830 | static int | |
8bbace7e | 831 | io_subchannel_probe (struct subchannel *sch) |
1da177e4 | 832 | { |
1da177e4 LT |
833 | struct ccw_device *cdev; |
834 | int rc; | |
835 | unsigned long flags; | |
836 | ||
1da177e4 LT |
837 | if (sch->dev.driver_data) { |
838 | /* | |
839 | * This subchannel already has an associated ccw_device. | |
840 | * Register it and exit. This happens for all early | |
841 | * device, e.g. the console. | |
842 | */ | |
843 | cdev = sch->dev.driver_data; | |
844 | device_initialize(&cdev->dev); | |
845 | ccw_device_register(cdev); | |
846 | subchannel_add_files(&sch->dev); | |
847 | /* | |
848 | * Check if the device is already online. If it is | |
849 | * the reference count needs to be corrected | |
850 | * (see ccw_device_online and css_init_done for the | |
851 | * ugly details). | |
852 | */ | |
853 | if (cdev->private->state != DEV_STATE_NOT_OPER && | |
854 | cdev->private->state != DEV_STATE_OFFLINE && | |
855 | cdev->private->state != DEV_STATE_BOXED) | |
856 | get_device(&cdev->dev); | |
857 | return 0; | |
858 | } | |
88abaab4 | 859 | cdev = kzalloc (sizeof(*cdev), GFP_KERNEL); |
1da177e4 LT |
860 | if (!cdev) |
861 | return -ENOMEM; | |
88abaab4 | 862 | cdev->private = kzalloc(sizeof(struct ccw_device_private), |
1da177e4 LT |
863 | GFP_KERNEL | GFP_DMA); |
864 | if (!cdev->private) { | |
865 | kfree(cdev); | |
866 | return -ENOMEM; | |
867 | } | |
1da177e4 | 868 | atomic_set(&cdev->private->onoff, 0); |
292888c8 HC |
869 | cdev->dev.parent = &sch->dev; |
870 | cdev->dev.release = ccw_device_release; | |
1da177e4 LT |
871 | INIT_LIST_HEAD(&cdev->private->kick_work.entry); |
872 | /* Do first half of device_register. */ | |
873 | device_initialize(&cdev->dev); | |
874 | ||
875 | if (!get_device(&sch->dev)) { | |
876 | if (cdev->dev.release) | |
877 | cdev->dev.release(&cdev->dev); | |
878 | return -ENODEV; | |
879 | } | |
880 | ||
8bbace7e | 881 | rc = io_subchannel_recog(cdev, sch); |
1da177e4 LT |
882 | if (rc) { |
883 | spin_lock_irqsave(&sch->lock, flags); | |
884 | sch->dev.driver_data = NULL; | |
885 | spin_unlock_irqrestore(&sch->lock, flags); | |
886 | if (cdev->dev.release) | |
887 | cdev->dev.release(&cdev->dev); | |
888 | } | |
889 | ||
890 | return rc; | |
891 | } | |
892 | ||
893 | static void | |
894 | ccw_device_unregister(void *data) | |
895 | { | |
896 | struct ccw_device *cdev; | |
897 | ||
898 | cdev = (struct ccw_device *)data; | |
899 | if (test_and_clear_bit(1, &cdev->private->registered)) | |
900 | device_unregister(&cdev->dev); | |
901 | put_device(&cdev->dev); | |
902 | } | |
903 | ||
904 | static int | |
8bbace7e | 905 | io_subchannel_remove (struct subchannel *sch) |
1da177e4 LT |
906 | { |
907 | struct ccw_device *cdev; | |
908 | unsigned long flags; | |
909 | ||
8bbace7e | 910 | if (!sch->dev.driver_data) |
1da177e4 | 911 | return 0; |
8bbace7e | 912 | cdev = sch->dev.driver_data; |
1da177e4 LT |
913 | /* Set ccw device to not operational and drop reference. */ |
914 | spin_lock_irqsave(cdev->ccwlock, flags); | |
8bbace7e | 915 | sch->dev.driver_data = NULL; |
1da177e4 LT |
916 | cdev->private->state = DEV_STATE_NOT_OPER; |
917 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
918 | /* | |
919 | * Put unregistration on workqueue to avoid livelocks on the css bus | |
920 | * semaphore. | |
921 | */ | |
922 | if (get_device(&cdev->dev)) { | |
923 | PREPARE_WORK(&cdev->private->kick_work, | |
12975aef | 924 | ccw_device_unregister, cdev); |
1da177e4 LT |
925 | queue_work(ccw_device_work, &cdev->private->kick_work); |
926 | } | |
927 | return 0; | |
928 | } | |
929 | ||
930 | static int | |
931 | io_subchannel_notify(struct device *dev, int event) | |
932 | { | |
933 | struct ccw_device *cdev; | |
934 | ||
935 | cdev = dev->driver_data; | |
936 | if (!cdev) | |
937 | return 0; | |
938 | if (!cdev->drv) | |
939 | return 0; | |
940 | if (!cdev->online) | |
941 | return 0; | |
942 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
943 | } | |
944 | ||
945 | static void | |
946 | io_subchannel_verify(struct device *dev) | |
947 | { | |
948 | struct ccw_device *cdev; | |
949 | ||
950 | cdev = dev->driver_data; | |
951 | if (cdev) | |
952 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
953 | } | |
954 | ||
955 | static void | |
956 | io_subchannel_ioterm(struct device *dev) | |
957 | { | |
958 | struct ccw_device *cdev; | |
959 | ||
960 | cdev = dev->driver_data; | |
961 | if (!cdev) | |
962 | return; | |
d23861ff CH |
963 | /* Internal I/O will be retried by the interrupt handler. */ |
964 | if (cdev->private->flags.intretry) | |
965 | return; | |
1da177e4 LT |
966 | cdev->private->state = DEV_STATE_CLEAR_VERIFY; |
967 | if (cdev->handler) | |
968 | cdev->handler(cdev, cdev->private->intparm, | |
969 | ERR_PTR(-EIO)); | |
970 | } | |
971 | ||
972 | static void | |
8bbace7e | 973 | io_subchannel_shutdown(struct subchannel *sch) |
1da177e4 | 974 | { |
1da177e4 LT |
975 | struct ccw_device *cdev; |
976 | int ret; | |
977 | ||
8bbace7e | 978 | cdev = sch->dev.driver_data; |
1da177e4 | 979 | |
a8237fc4 | 980 | if (cio_is_console(sch->schid)) |
1da177e4 LT |
981 | return; |
982 | if (!sch->schib.pmcw.ena) | |
983 | /* Nothing to do. */ | |
984 | return; | |
985 | ret = cio_disable_subchannel(sch); | |
986 | if (ret != -EBUSY) | |
987 | /* Subchannel is disabled, we're done. */ | |
988 | return; | |
989 | cdev->private->state = DEV_STATE_QUIESCE; | |
990 | if (cdev->handler) | |
991 | cdev->handler(cdev, cdev->private->intparm, | |
992 | ERR_PTR(-EIO)); | |
993 | ret = ccw_device_cancel_halt_clear(cdev); | |
994 | if (ret == -EBUSY) { | |
995 | ccw_device_set_timeout(cdev, HZ/10); | |
996 | wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev)); | |
997 | } | |
998 | cio_disable_subchannel(sch); | |
999 | } | |
1000 | ||
1001 | #ifdef CONFIG_CCW_CONSOLE | |
1002 | static struct ccw_device console_cdev; | |
1003 | static struct ccw_device_private console_private; | |
1004 | static int console_cdev_in_use; | |
1005 | ||
1006 | static int | |
1007 | ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch) | |
1008 | { | |
1009 | int rc; | |
1010 | ||
1011 | /* Initialize the ccw_device structure. */ | |
292888c8 | 1012 | cdev->dev.parent= &sch->dev; |
1da177e4 LT |
1013 | rc = io_subchannel_recog(cdev, sch); |
1014 | if (rc) | |
1015 | return rc; | |
1016 | ||
1017 | /* Now wait for the async. recognition to come to an end. */ | |
1018 | spin_lock_irq(cdev->ccwlock); | |
1019 | while (!dev_fsm_final_state(cdev)) | |
1020 | wait_cons_dev(); | |
1021 | rc = -EIO; | |
1022 | if (cdev->private->state != DEV_STATE_OFFLINE) | |
1023 | goto out_unlock; | |
1024 | ccw_device_online(cdev); | |
1025 | while (!dev_fsm_final_state(cdev)) | |
1026 | wait_cons_dev(); | |
1027 | if (cdev->private->state != DEV_STATE_ONLINE) | |
1028 | goto out_unlock; | |
1029 | rc = 0; | |
1030 | out_unlock: | |
1031 | spin_unlock_irq(cdev->ccwlock); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | struct ccw_device * | |
1036 | ccw_device_probe_console(void) | |
1037 | { | |
1038 | struct subchannel *sch; | |
1039 | int ret; | |
1040 | ||
1041 | if (xchg(&console_cdev_in_use, 1) != 0) | |
600b5d16 | 1042 | return ERR_PTR(-EBUSY); |
1da177e4 LT |
1043 | sch = cio_probe_console(); |
1044 | if (IS_ERR(sch)) { | |
1045 | console_cdev_in_use = 0; | |
1046 | return (void *) sch; | |
1047 | } | |
1048 | memset(&console_cdev, 0, sizeof(struct ccw_device)); | |
1049 | memset(&console_private, 0, sizeof(struct ccw_device_private)); | |
1050 | console_cdev.private = &console_private; | |
1051 | ret = ccw_device_console_enable(&console_cdev, sch); | |
1052 | if (ret) { | |
1053 | cio_release_console(); | |
1054 | console_cdev_in_use = 0; | |
1055 | return ERR_PTR(ret); | |
1056 | } | |
1057 | console_cdev.online = 1; | |
1058 | return &console_cdev; | |
1059 | } | |
1060 | #endif | |
1061 | ||
1062 | /* | |
1063 | * get ccw_device matching the busid, but only if owned by cdrv | |
1064 | */ | |
b0744bd2 CH |
1065 | static int |
1066 | __ccwdev_check_busid(struct device *dev, void *id) | |
1067 | { | |
1068 | char *bus_id; | |
1069 | ||
12975aef | 1070 | bus_id = id; |
b0744bd2 CH |
1071 | |
1072 | return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0); | |
1073 | } | |
1074 | ||
1075 | ||
1da177e4 LT |
1076 | struct ccw_device * |
1077 | get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id) | |
1078 | { | |
b0744bd2 | 1079 | struct device *dev; |
1da177e4 LT |
1080 | struct device_driver *drv; |
1081 | ||
1082 | drv = get_driver(&cdrv->driver); | |
1083 | if (!drv) | |
b0744bd2 | 1084 | return NULL; |
1da177e4 | 1085 | |
b0744bd2 CH |
1086 | dev = driver_find_device(drv, NULL, (void *)bus_id, |
1087 | __ccwdev_check_busid); | |
1da177e4 LT |
1088 | put_driver(drv); |
1089 | ||
d2c993d8 | 1090 | return dev ? to_ccwdev(dev) : NULL; |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | /************************** device driver handling ************************/ | |
1094 | ||
1095 | /* This is the implementation of the ccw_driver class. The probe, remove | |
1096 | * and release methods are initially very similar to the device_driver | |
1097 | * implementations, with the difference that they have ccw_device | |
1098 | * arguments. | |
1099 | * | |
1100 | * A ccw driver also contains the information that is needed for | |
1101 | * device matching. | |
1102 | */ | |
1103 | static int | |
1104 | ccw_device_probe (struct device *dev) | |
1105 | { | |
1106 | struct ccw_device *cdev = to_ccwdev(dev); | |
1107 | struct ccw_driver *cdrv = to_ccwdrv(dev->driver); | |
1108 | int ret; | |
1109 | ||
1110 | cdev->drv = cdrv; /* to let the driver call _set_online */ | |
1111 | ||
1112 | ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV; | |
1113 | ||
1114 | if (ret) { | |
d2c993d8 | 1115 | cdev->drv = NULL; |
1da177e4 LT |
1116 | return ret; |
1117 | } | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | static int | |
1123 | ccw_device_remove (struct device *dev) | |
1124 | { | |
1125 | struct ccw_device *cdev = to_ccwdev(dev); | |
1126 | struct ccw_driver *cdrv = cdev->drv; | |
1127 | int ret; | |
1128 | ||
1129 | pr_debug("removing device %s\n", cdev->dev.bus_id); | |
1130 | if (cdrv->remove) | |
1131 | cdrv->remove(cdev); | |
1132 | if (cdev->online) { | |
1133 | cdev->online = 0; | |
1134 | spin_lock_irq(cdev->ccwlock); | |
1135 | ret = ccw_device_offline(cdev); | |
1136 | spin_unlock_irq(cdev->ccwlock); | |
1137 | if (ret == 0) | |
1138 | wait_event(cdev->private->wait_q, | |
1139 | dev_fsm_final_state(cdev)); | |
1140 | else | |
1141 | //FIXME: we can't fail! | |
1142 | pr_debug("ccw_device_offline returned %d, device %s\n", | |
1143 | ret, cdev->dev.bus_id); | |
1144 | } | |
1145 | ccw_device_set_timeout(cdev, 0); | |
d2c993d8 | 1146 | cdev->drv = NULL; |
1da177e4 LT |
1147 | return 0; |
1148 | } | |
1149 | ||
8bbace7e CH |
1150 | struct bus_type ccw_bus_type = { |
1151 | .name = "ccw", | |
1152 | .match = ccw_bus_match, | |
1153 | .uevent = ccw_uevent, | |
1154 | .probe = ccw_device_probe, | |
1155 | .remove = ccw_device_remove, | |
1156 | }; | |
1157 | ||
1da177e4 LT |
1158 | int |
1159 | ccw_driver_register (struct ccw_driver *cdriver) | |
1160 | { | |
1161 | struct device_driver *drv = &cdriver->driver; | |
1162 | ||
1163 | drv->bus = &ccw_bus_type; | |
1164 | drv->name = cdriver->name; | |
1da177e4 LT |
1165 | |
1166 | return driver_register(drv); | |
1167 | } | |
1168 | ||
1169 | void | |
1170 | ccw_driver_unregister (struct ccw_driver *cdriver) | |
1171 | { | |
1172 | driver_unregister(&cdriver->driver); | |
1173 | } | |
1174 | ||
a8237fc4 CH |
1175 | /* Helper func for qdio. */ |
1176 | struct subchannel_id | |
1177 | ccw_device_get_subchannel_id(struct ccw_device *cdev) | |
1178 | { | |
1179 | struct subchannel *sch; | |
1180 | ||
1181 | sch = to_subchannel(cdev->dev.parent); | |
1182 | return sch->schid; | |
1183 | } | |
1184 | ||
1da177e4 LT |
1185 | MODULE_LICENSE("GPL"); |
1186 | EXPORT_SYMBOL(ccw_device_set_online); | |
1187 | EXPORT_SYMBOL(ccw_device_set_offline); | |
1188 | EXPORT_SYMBOL(ccw_driver_register); | |
1189 | EXPORT_SYMBOL(ccw_driver_unregister); | |
1190 | EXPORT_SYMBOL(get_ccwdev_by_busid); | |
1191 | EXPORT_SYMBOL(ccw_bus_type); | |
1192 | EXPORT_SYMBOL(ccw_device_work); | |
1193 | EXPORT_SYMBOL(ccw_device_notify_work); | |
a8237fc4 | 1194 | EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id); |