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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * bus driver for ccwgroup |
1da177e4 | 3 | * |
7e597a21 SO |
4 | * Copyright IBM Corp. 2002, 2009 |
5 | * | |
6 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
7 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
1da177e4 LT |
8 | */ |
9 | #include <linux/module.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/list.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/dcache.h> | |
17 | ||
1da177e4 LT |
18 | #include <asm/ccwdev.h> |
19 | #include <asm/ccwgroup.h> | |
20 | ||
98df67b3 KS |
21 | #define CCW_BUS_ID_SIZE 20 |
22 | ||
1da177e4 LT |
23 | /* In Linux 2.4, we had a channel device layer called "chandev" |
24 | * that did all sorts of obscure stuff for networking devices. | |
25 | * This is another driver that serves as a replacement for just | |
26 | * one of its functions, namely the translation of single subchannels | |
27 | * to devices that use multiple subchannels. | |
28 | */ | |
29 | ||
30 | /* a device matches a driver if all its slave devices match the same | |
31 | * entry of the driver */ | |
32 | static int | |
33 | ccwgroup_bus_match (struct device * dev, struct device_driver * drv) | |
34 | { | |
35 | struct ccwgroup_device *gdev; | |
36 | struct ccwgroup_driver *gdrv; | |
37 | ||
084325d8 CH |
38 | gdev = to_ccwgroupdev(dev); |
39 | gdrv = to_ccwgroupdrv(drv); | |
1da177e4 LT |
40 | |
41 | if (gdev->creator_id == gdrv->driver_id) | |
42 | return 1; | |
43 | ||
44 | return 0; | |
45 | } | |
46 | static int | |
7eff2e7a | 47 | ccwgroup_uevent (struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
48 | { |
49 | /* TODO */ | |
50 | return 0; | |
51 | } | |
52 | ||
f9ccf456 | 53 | static struct bus_type ccwgroup_bus_type; |
1da177e4 | 54 | |
4d284cac | 55 | static void |
1da177e4 LT |
56 | __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) |
57 | { | |
58 | int i; | |
59 | char str[8]; | |
60 | ||
61 | for (i = 0; i < gdev->count; i++) { | |
62 | sprintf(str, "cdev%d", i); | |
63 | sysfs_remove_link(&gdev->dev.kobj, str); | |
64 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); | |
65 | } | |
66 | ||
67 | } | |
68 | ||
69 | /* | |
70 | * Provide an 'ungroup' attribute so the user can remove group devices no | |
71 | * longer needed or accidentially created. Saves memory :) | |
72 | */ | |
d9a9cdfb AS |
73 | static void ccwgroup_ungroup_callback(struct device *dev) |
74 | { | |
75 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
76 | ||
d76123eb | 77 | mutex_lock(&gdev->reg_mutex); |
1a908c73 CH |
78 | if (device_is_registered(&gdev->dev)) { |
79 | __ccwgroup_remove_symlinks(gdev); | |
80 | device_unregister(dev); | |
81 | } | |
d76123eb | 82 | mutex_unlock(&gdev->reg_mutex); |
d9a9cdfb AS |
83 | } |
84 | ||
1da177e4 | 85 | static ssize_t |
3fd3c0a5 | 86 | ccwgroup_ungroup_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
87 | { |
88 | struct ccwgroup_device *gdev; | |
d9a9cdfb | 89 | int rc; |
1da177e4 LT |
90 | |
91 | gdev = to_ccwgroupdev(dev); | |
92 | ||
c619d422 PO |
93 | /* Prevent concurrent online/offline processing and ungrouping. */ |
94 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
95 | return -EAGAIN; | |
96 | if (gdev->state != CCWGROUP_OFFLINE) { | |
97 | rc = -EINVAL; | |
98 | goto out; | |
99 | } | |
d9a9cdfb AS |
100 | /* Note that we cannot unregister the device from one of its |
101 | * attribute methods, so we have to use this roundabout approach. | |
102 | */ | |
103 | rc = device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
c619d422 PO |
104 | out: |
105 | if (rc) { | |
66942064 AC |
106 | if (rc != -EAGAIN) |
107 | /* Release onoff "lock" when ungrouping failed. */ | |
108 | atomic_set(&gdev->onoff, 0); | |
c619d422 PO |
109 | return rc; |
110 | } | |
1da177e4 LT |
111 | return count; |
112 | } | |
113 | ||
114 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); | |
115 | ||
116 | static void | |
117 | ccwgroup_release (struct device *dev) | |
118 | { | |
119 | struct ccwgroup_device *gdev; | |
120 | int i; | |
121 | ||
122 | gdev = to_ccwgroupdev(dev); | |
123 | ||
124 | for (i = 0; i < gdev->count; i++) { | |
16f7f956 | 125 | if (gdev->cdev[i]) { |
f26fd5d6 CH |
126 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
127 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
16f7f956 PO |
128 | put_device(&gdev->cdev[i]->dev); |
129 | } | |
1da177e4 LT |
130 | } |
131 | kfree(gdev); | |
132 | } | |
133 | ||
4d284cac | 134 | static int |
1da177e4 LT |
135 | __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
136 | { | |
137 | char str[8]; | |
138 | int i, rc; | |
139 | ||
140 | for (i = 0; i < gdev->count; i++) { | |
141 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj, | |
142 | "group_device"); | |
143 | if (rc) { | |
144 | for (--i; i >= 0; i--) | |
145 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
146 | "group_device"); | |
147 | return rc; | |
148 | } | |
149 | } | |
150 | for (i = 0; i < gdev->count; i++) { | |
151 | sprintf(str, "cdev%d", i); | |
152 | rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj, | |
153 | str); | |
154 | if (rc) { | |
155 | for (--i; i >= 0; i--) { | |
156 | sprintf(str, "cdev%d", i); | |
157 | sysfs_remove_link(&gdev->dev.kobj, str); | |
158 | } | |
159 | for (i = 0; i < gdev->count; i++) | |
160 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
161 | "group_device"); | |
162 | return rc; | |
163 | } | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
022b660a UB |
168 | static int __get_next_bus_id(const char **buf, char *bus_id) |
169 | { | |
170 | int rc, len; | |
171 | char *start, *end; | |
172 | ||
173 | start = (char *)*buf; | |
174 | end = strchr(start, ','); | |
175 | if (!end) { | |
176 | /* Last entry. Strip trailing newline, if applicable. */ | |
177 | end = strchr(start, '\n'); | |
178 | if (end) | |
179 | *end = '\0'; | |
180 | len = strlen(start) + 1; | |
181 | } else { | |
182 | len = end - start + 1; | |
183 | end++; | |
184 | } | |
98df67b3 | 185 | if (len < CCW_BUS_ID_SIZE) { |
022b660a UB |
186 | strlcpy(bus_id, start, len); |
187 | rc = 0; | |
188 | } else | |
189 | rc = -EINVAL; | |
190 | *buf = end; | |
191 | return rc; | |
192 | } | |
193 | ||
98df67b3 | 194 | static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE]) |
022b660a UB |
195 | { |
196 | int cssid, ssid, devno; | |
197 | ||
198 | /* Must be of form %x.%x.%04x */ | |
199 | if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
200 | return 0; | |
201 | return 1; | |
202 | } | |
203 | ||
b2ffd8e9 | 204 | /** |
022b660a | 205 | * ccwgroup_create_from_string() - create and register a ccw group device |
b2ffd8e9 CH |
206 | * @root: parent device for the new device |
207 | * @creator_id: identifier of creating driver | |
208 | * @cdrv: ccw driver of slave devices | |
022b660a UB |
209 | * @num_devices: number of slave devices |
210 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 CH |
211 | * |
212 | * Create and register a new ccw group device as a child of @root. Slave | |
022b660a | 213 | * devices are obtained from the list of bus ids given in @buf and must all |
b2ffd8e9 CH |
214 | * belong to @cdrv. |
215 | * Returns: | |
216 | * %0 on success and an error code on failure. | |
217 | * Context: | |
218 | * non-atomic | |
1da177e4 | 219 | */ |
022b660a UB |
220 | int ccwgroup_create_from_string(struct device *root, unsigned int creator_id, |
221 | struct ccw_driver *cdrv, int num_devices, | |
222 | const char *buf) | |
1da177e4 LT |
223 | { |
224 | struct ccwgroup_device *gdev; | |
022b660a | 225 | int rc, i; |
98df67b3 | 226 | char tmp_bus_id[CCW_BUS_ID_SIZE]; |
022b660a | 227 | const char *curr_buf; |
1da177e4 | 228 | |
022b660a UB |
229 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
230 | GFP_KERNEL); | |
1da177e4 LT |
231 | if (!gdev) |
232 | return -ENOMEM; | |
233 | ||
1da177e4 | 234 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
235 | mutex_init(&gdev->reg_mutex); |
236 | mutex_lock(&gdev->reg_mutex); | |
16f7f956 PO |
237 | gdev->creator_id = creator_id; |
238 | gdev->count = num_devices; | |
239 | gdev->dev.bus = &ccwgroup_bus_type; | |
240 | gdev->dev.parent = root; | |
241 | gdev->dev.release = ccwgroup_release; | |
242 | device_initialize(&gdev->dev); | |
243 | ||
022b660a UB |
244 | curr_buf = buf; |
245 | for (i = 0; i < num_devices && curr_buf; i++) { | |
246 | rc = __get_next_bus_id(&curr_buf, tmp_bus_id); | |
247 | if (rc != 0) | |
248 | goto error; | |
249 | if (!__is_valid_bus_id(tmp_bus_id)) { | |
250 | rc = -EINVAL; | |
251 | goto error; | |
252 | } | |
253 | gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id); | |
254 | /* | |
255 | * All devices have to be of the same type in | |
256 | * order to be grouped. | |
257 | */ | |
1da177e4 LT |
258 | if (!gdev->cdev[i] |
259 | || gdev->cdev[i]->id.driver_info != | |
260 | gdev->cdev[0]->id.driver_info) { | |
261 | rc = -EINVAL; | |
d76123eb | 262 | goto error; |
1da177e4 LT |
263 | } |
264 | /* Don't allow a device to belong to more than one group. */ | |
db6a6423 | 265 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
1da177e4 | 266 | rc = -EINVAL; |
d76123eb | 267 | goto error; |
1da177e4 | 268 | } |
db6a6423 | 269 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
17088229 | 270 | } |
022b660a UB |
271 | /* Check for sufficient number of bus ids. */ |
272 | if (i < num_devices && !curr_buf) { | |
273 | rc = -EINVAL; | |
274 | goto error; | |
275 | } | |
276 | /* Check for trailing stuff. */ | |
277 | if (i == num_devices && strlen(curr_buf) > 0) { | |
278 | rc = -EINVAL; | |
279 | goto error; | |
280 | } | |
1da177e4 | 281 | |
1bf5b285 | 282 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
1da177e4 | 283 | |
16f7f956 | 284 | rc = device_add(&gdev->dev); |
1da177e4 | 285 | if (rc) |
d76123eb | 286 | goto error; |
1da177e4 LT |
287 | get_device(&gdev->dev); |
288 | rc = device_create_file(&gdev->dev, &dev_attr_ungroup); | |
289 | ||
290 | if (rc) { | |
291 | device_unregister(&gdev->dev); | |
292 | goto error; | |
293 | } | |
294 | ||
295 | rc = __ccwgroup_create_symlinks(gdev); | |
296 | if (!rc) { | |
d76123eb | 297 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
298 | put_device(&gdev->dev); |
299 | return 0; | |
300 | } | |
301 | device_remove_file(&gdev->dev, &dev_attr_ungroup); | |
302 | device_unregister(&gdev->dev); | |
303 | error: | |
022b660a | 304 | for (i = 0; i < num_devices; i++) |
1da177e4 | 305 | if (gdev->cdev[i]) { |
db6a6423 CH |
306 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
307 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
17088229 | 308 | put_device(&gdev->cdev[i]->dev); |
f26fd5d6 | 309 | gdev->cdev[i] = NULL; |
1da177e4 | 310 | } |
d76123eb CH |
311 | mutex_unlock(&gdev->reg_mutex); |
312 | put_device(&gdev->dev); | |
1da177e4 LT |
313 | return rc; |
314 | } | |
022b660a | 315 | EXPORT_SYMBOL(ccwgroup_create_from_string); |
1da177e4 | 316 | |
e909074b SO |
317 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
318 | void *data); | |
319 | ||
320 | static struct notifier_block ccwgroup_nb = { | |
321 | .notifier_call = ccwgroup_notifier | |
322 | }; | |
323 | ||
324 | static int __init init_ccwgroup(void) | |
1da177e4 | 325 | { |
e909074b SO |
326 | int ret; |
327 | ||
328 | ret = bus_register(&ccwgroup_bus_type); | |
329 | if (ret) | |
330 | return ret; | |
331 | ||
332 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); | |
333 | if (ret) | |
334 | bus_unregister(&ccwgroup_bus_type); | |
335 | ||
336 | return ret; | |
1da177e4 LT |
337 | } |
338 | ||
e909074b | 339 | static void __exit cleanup_ccwgroup(void) |
1da177e4 | 340 | { |
e909074b SO |
341 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
342 | bus_unregister(&ccwgroup_bus_type); | |
1da177e4 LT |
343 | } |
344 | ||
345 | module_init(init_ccwgroup); | |
346 | module_exit(cleanup_ccwgroup); | |
347 | ||
348 | /************************** driver stuff ******************************/ | |
349 | ||
350 | static int | |
351 | ccwgroup_set_online(struct ccwgroup_device *gdev) | |
352 | { | |
353 | struct ccwgroup_driver *gdrv; | |
354 | int ret; | |
355 | ||
973bd993 | 356 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
357 | return -EAGAIN; |
358 | if (gdev->state == CCWGROUP_ONLINE) { | |
359 | ret = 0; | |
360 | goto out; | |
361 | } | |
362 | if (!gdev->dev.driver) { | |
363 | ret = -EINVAL; | |
364 | goto out; | |
365 | } | |
366 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 367 | if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0)) |
1da177e4 LT |
368 | goto out; |
369 | ||
370 | gdev->state = CCWGROUP_ONLINE; | |
371 | out: | |
372 | atomic_set(&gdev->onoff, 0); | |
373 | return ret; | |
374 | } | |
375 | ||
376 | static int | |
377 | ccwgroup_set_offline(struct ccwgroup_device *gdev) | |
378 | { | |
379 | struct ccwgroup_driver *gdrv; | |
380 | int ret; | |
381 | ||
973bd993 | 382 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
383 | return -EAGAIN; |
384 | if (gdev->state == CCWGROUP_OFFLINE) { | |
385 | ret = 0; | |
386 | goto out; | |
387 | } | |
388 | if (!gdev->dev.driver) { | |
389 | ret = -EINVAL; | |
390 | goto out; | |
391 | } | |
392 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 393 | if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0)) |
1da177e4 LT |
394 | goto out; |
395 | ||
396 | gdev->state = CCWGROUP_OFFLINE; | |
397 | out: | |
398 | atomic_set(&gdev->onoff, 0); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | static ssize_t | |
3fd3c0a5 | 403 | ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
404 | { |
405 | struct ccwgroup_device *gdev; | |
406 | struct ccwgroup_driver *gdrv; | |
2f972202 | 407 | unsigned long value; |
1da177e4 LT |
408 | int ret; |
409 | ||
1da177e4 | 410 | if (!dev->driver) |
40c9f999 SO |
411 | return -ENODEV; |
412 | ||
413 | gdev = to_ccwgroupdev(dev); | |
414 | gdrv = to_ccwgroupdrv(dev->driver); | |
1da177e4 | 415 | |
1da177e4 LT |
416 | if (!try_module_get(gdrv->owner)) |
417 | return -EINVAL; | |
418 | ||
2f972202 CH |
419 | ret = strict_strtoul(buf, 0, &value); |
420 | if (ret) | |
421 | goto out; | |
40c9f999 | 422 | |
1da177e4 | 423 | if (value == 1) |
40c9f999 | 424 | ret = ccwgroup_set_online(gdev); |
1da177e4 | 425 | else if (value == 0) |
40c9f999 | 426 | ret = ccwgroup_set_offline(gdev); |
1da177e4 LT |
427 | else |
428 | ret = -EINVAL; | |
2f972202 | 429 | out: |
1da177e4 | 430 | module_put(gdrv->owner); |
40c9f999 | 431 | return (ret == 0) ? count : ret; |
1da177e4 LT |
432 | } |
433 | ||
434 | static ssize_t | |
3fd3c0a5 | 435 | ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
436 | { |
437 | int online; | |
438 | ||
439 | online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE); | |
440 | ||
441 | return sprintf(buf, online ? "1\n" : "0\n"); | |
442 | } | |
443 | ||
444 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); | |
445 | ||
446 | static int | |
447 | ccwgroup_probe (struct device *dev) | |
448 | { | |
449 | struct ccwgroup_device *gdev; | |
450 | struct ccwgroup_driver *gdrv; | |
451 | ||
452 | int ret; | |
453 | ||
454 | gdev = to_ccwgroupdev(dev); | |
455 | gdrv = to_ccwgroupdrv(dev->driver); | |
456 | ||
457 | if ((ret = device_create_file(dev, &dev_attr_online))) | |
458 | return ret; | |
459 | ||
1da177e4 LT |
460 | ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV; |
461 | if (ret) | |
462 | device_remove_file(dev, &dev_attr_online); | |
463 | ||
464 | return ret; | |
465 | } | |
466 | ||
467 | static int | |
468 | ccwgroup_remove (struct device *dev) | |
469 | { | |
470 | struct ccwgroup_device *gdev; | |
471 | struct ccwgroup_driver *gdrv; | |
472 | ||
50f15483 | 473 | device_remove_file(dev, &dev_attr_online); |
e909074b | 474 | device_remove_file(dev, &dev_attr_ungroup); |
50f15483 SO |
475 | |
476 | if (!dev->driver) | |
477 | return 0; | |
478 | ||
1da177e4 LT |
479 | gdev = to_ccwgroupdev(dev); |
480 | gdrv = to_ccwgroupdrv(dev->driver); | |
481 | ||
50f15483 | 482 | if (gdrv->remove) |
1da177e4 | 483 | gdrv->remove(gdev); |
50f15483 | 484 | |
1da177e4 LT |
485 | return 0; |
486 | } | |
487 | ||
01bc8ad1 CH |
488 | static void ccwgroup_shutdown(struct device *dev) |
489 | { | |
490 | struct ccwgroup_device *gdev; | |
491 | struct ccwgroup_driver *gdrv; | |
492 | ||
50f15483 SO |
493 | if (!dev->driver) |
494 | return; | |
495 | ||
01bc8ad1 CH |
496 | gdev = to_ccwgroupdev(dev); |
497 | gdrv = to_ccwgroupdrv(dev->driver); | |
50f15483 SO |
498 | |
499 | if (gdrv->shutdown) | |
01bc8ad1 CH |
500 | gdrv->shutdown(gdev); |
501 | } | |
502 | ||
7e597a21 SO |
503 | static int ccwgroup_pm_prepare(struct device *dev) |
504 | { | |
505 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
506 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
507 | ||
508 | /* Fail while device is being set online/offline. */ | |
509 | if (atomic_read(&gdev->onoff)) | |
510 | return -EAGAIN; | |
511 | ||
512 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
513 | return 0; | |
514 | ||
515 | return gdrv->prepare ? gdrv->prepare(gdev) : 0; | |
516 | } | |
517 | ||
518 | static void ccwgroup_pm_complete(struct device *dev) | |
519 | { | |
520 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
521 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
522 | ||
523 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
524 | return; | |
525 | ||
526 | if (gdrv->complete) | |
527 | gdrv->complete(gdev); | |
528 | } | |
529 | ||
530 | static int ccwgroup_pm_freeze(struct device *dev) | |
531 | { | |
532 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
533 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
534 | ||
535 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
536 | return 0; | |
537 | ||
538 | return gdrv->freeze ? gdrv->freeze(gdev) : 0; | |
539 | } | |
540 | ||
541 | static int ccwgroup_pm_thaw(struct device *dev) | |
542 | { | |
543 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
544 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
545 | ||
546 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
547 | return 0; | |
548 | ||
549 | return gdrv->thaw ? gdrv->thaw(gdev) : 0; | |
550 | } | |
551 | ||
552 | static int ccwgroup_pm_restore(struct device *dev) | |
553 | { | |
554 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
555 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
556 | ||
557 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
558 | return 0; | |
559 | ||
560 | return gdrv->restore ? gdrv->restore(gdev) : 0; | |
561 | } | |
562 | ||
47145210 | 563 | static const struct dev_pm_ops ccwgroup_pm_ops = { |
7e597a21 SO |
564 | .prepare = ccwgroup_pm_prepare, |
565 | .complete = ccwgroup_pm_complete, | |
566 | .freeze = ccwgroup_pm_freeze, | |
567 | .thaw = ccwgroup_pm_thaw, | |
568 | .restore = ccwgroup_pm_restore, | |
569 | }; | |
570 | ||
f9ccf456 RK |
571 | static struct bus_type ccwgroup_bus_type = { |
572 | .name = "ccwgroup", | |
573 | .match = ccwgroup_bus_match, | |
574 | .uevent = ccwgroup_uevent, | |
575 | .probe = ccwgroup_probe, | |
576 | .remove = ccwgroup_remove, | |
01bc8ad1 | 577 | .shutdown = ccwgroup_shutdown, |
7e597a21 | 578 | .pm = &ccwgroup_pm_ops, |
f9ccf456 RK |
579 | }; |
580 | ||
e909074b SO |
581 | |
582 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, | |
583 | void *data) | |
584 | { | |
585 | struct device *dev = data; | |
586 | ||
587 | if (action == BUS_NOTIFY_UNBIND_DRIVER) | |
588 | device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
589 | ||
590 | return NOTIFY_OK; | |
591 | } | |
592 | ||
593 | ||
b2ffd8e9 CH |
594 | /** |
595 | * ccwgroup_driver_register() - register a ccw group driver | |
596 | * @cdriver: driver to be registered | |
597 | * | |
598 | * This function is mainly a wrapper around driver_register(). | |
599 | */ | |
600 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
601 | { |
602 | /* register our new driver with the core */ | |
292888c8 HC |
603 | cdriver->driver.bus = &ccwgroup_bus_type; |
604 | cdriver->driver.name = cdriver->name; | |
4beee646 | 605 | cdriver->driver.owner = cdriver->owner; |
1da177e4 LT |
606 | |
607 | return driver_register(&cdriver->driver); | |
608 | } | |
609 | ||
b0744bd2 | 610 | static int |
887ab599 | 611 | __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 612 | { |
887ab599 | 613 | return 1; |
1da177e4 LT |
614 | } |
615 | ||
b2ffd8e9 CH |
616 | /** |
617 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
618 | * @cdriver: driver to be deregistered | |
619 | * | |
620 | * This function is mainly a wrapper around driver_unregister(). | |
621 | */ | |
622 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 623 | { |
887ab599 CH |
624 | struct device *dev; |
625 | ||
1da177e4 LT |
626 | /* We don't want ccwgroup devices to live longer than their driver. */ |
627 | get_driver(&cdriver->driver); | |
887ab599 CH |
628 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
629 | __ccwgroup_match_all))) { | |
d76123eb CH |
630 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
631 | ||
632 | mutex_lock(&gdev->reg_mutex); | |
633 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 634 | device_unregister(dev); |
d76123eb | 635 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
636 | put_device(dev); |
637 | } | |
1da177e4 LT |
638 | put_driver(&cdriver->driver); |
639 | driver_unregister(&cdriver->driver); | |
640 | } | |
641 | ||
b2ffd8e9 CH |
642 | /** |
643 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
644 | * @cdev: ccw device to be probed | |
645 | * | |
646 | * This is a dummy probe function for ccw devices that are slave devices in | |
647 | * a ccw group device. | |
648 | * Returns: | |
649 | * always %0 | |
650 | */ | |
651 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
652 | { |
653 | return 0; | |
654 | } | |
655 | ||
4d284cac | 656 | static struct ccwgroup_device * |
1da177e4 LT |
657 | __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev) |
658 | { | |
659 | struct ccwgroup_device *gdev; | |
660 | ||
db6a6423 CH |
661 | gdev = dev_get_drvdata(&cdev->dev); |
662 | if (gdev) { | |
1da177e4 | 663 | if (get_device(&gdev->dev)) { |
d76123eb | 664 | mutex_lock(&gdev->reg_mutex); |
d305ef5d | 665 | if (device_is_registered(&gdev->dev)) |
1da177e4 | 666 | return gdev; |
d76123eb | 667 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
668 | put_device(&gdev->dev); |
669 | } | |
670 | return NULL; | |
671 | } | |
672 | return NULL; | |
673 | } | |
674 | ||
b2ffd8e9 CH |
675 | /** |
676 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
677 | * @cdev: ccw device to be removed | |
678 | * | |
679 | * This is a remove function for ccw devices that are slave devices in a ccw | |
680 | * group device. It sets the ccw device offline and also deregisters the | |
681 | * embedding ccw group device. | |
682 | */ | |
683 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
684 | { |
685 | struct ccwgroup_device *gdev; | |
686 | ||
687 | /* Ignore offlining errors, device is gone anyway. */ | |
688 | ccw_device_set_offline(cdev); | |
689 | /* If one of its devices is gone, the whole group is done for. */ | |
690 | gdev = __ccwgroup_get_gdev_by_cdev(cdev); | |
691 | if (gdev) { | |
692 | __ccwgroup_remove_symlinks(gdev); | |
693 | device_unregister(&gdev->dev); | |
d76123eb | 694 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
695 | put_device(&gdev->dev); |
696 | } | |
697 | } | |
698 | ||
699 | MODULE_LICENSE("GPL"); | |
700 | EXPORT_SYMBOL(ccwgroup_driver_register); | |
701 | EXPORT_SYMBOL(ccwgroup_driver_unregister); | |
1da177e4 LT |
702 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
703 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |