Commit | Line | Data |
---|---|---|
724117b7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 | 3 | * bus driver for ccwgroup |
1da177e4 | 4 | * |
f2962dae | 5 | * Copyright IBM Corp. 2002, 2012 |
7e597a21 SO |
6 | * |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
8 | * Cornelia Huck (cornelia.huck@de.ibm.com) | |
1da177e4 LT |
9 | */ |
10 | #include <linux/module.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/ctype.h> | |
17 | #include <linux/dcache.h> | |
18 | ||
b7a610f7 | 19 | #include <asm/cio.h> |
1da177e4 LT |
20 | #include <asm/ccwdev.h> |
21 | #include <asm/ccwgroup.h> | |
22 | ||
b7a610f7 SO |
23 | #include "device.h" |
24 | ||
25 | #define CCW_BUS_ID_SIZE 10 | |
98df67b3 | 26 | |
1da177e4 LT |
27 | /* In Linux 2.4, we had a channel device layer called "chandev" |
28 | * that did all sorts of obscure stuff for networking devices. | |
29 | * This is another driver that serves as a replacement for just | |
30 | * one of its functions, namely the translation of single subchannels | |
31 | * to devices that use multiple subchannels. | |
32 | */ | |
33 | ||
f9ccf456 | 34 | static struct bus_type ccwgroup_bus_type; |
1da177e4 | 35 | |
dad572e3 | 36 | static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) |
1da177e4 LT |
37 | { |
38 | int i; | |
2685df67 | 39 | char str[16]; |
1da177e4 LT |
40 | |
41 | for (i = 0; i < gdev->count; i++) { | |
42 | sprintf(str, "cdev%d", i); | |
43 | sysfs_remove_link(&gdev->dev.kobj, str); | |
44 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); | |
45 | } | |
1da177e4 LT |
46 | } |
47 | ||
683c3dce SO |
48 | /** |
49 | * ccwgroup_set_online() - enable a ccwgroup device | |
50 | * @gdev: target ccwgroup device | |
51 | * | |
52 | * This function attempts to put the ccwgroup device into the online state. | |
53 | * Returns: | |
54 | * %0 on success and a negative error value on failure. | |
55 | */ | |
56 | int ccwgroup_set_online(struct ccwgroup_device *gdev) | |
dad572e3 SO |
57 | { |
58 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
cff97102 | 59 | int ret = -EINVAL; |
dad572e3 SO |
60 | |
61 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
62 | return -EAGAIN; | |
63 | if (gdev->state == CCWGROUP_ONLINE) | |
64 | goto out; | |
65 | if (gdrv->set_online) | |
66 | ret = gdrv->set_online(gdev); | |
67 | if (ret) | |
68 | goto out; | |
69 | ||
70 | gdev->state = CCWGROUP_ONLINE; | |
71 | out: | |
72 | atomic_set(&gdev->onoff, 0); | |
73 | return ret; | |
74 | } | |
683c3dce | 75 | EXPORT_SYMBOL(ccwgroup_set_online); |
dad572e3 | 76 | |
683c3dce SO |
77 | /** |
78 | * ccwgroup_set_offline() - disable a ccwgroup device | |
79 | * @gdev: target ccwgroup device | |
d2b59bd4 | 80 | * @call_gdrv: Call the registered gdrv set_offline function |
683c3dce SO |
81 | * |
82 | * This function attempts to put the ccwgroup device into the offline state. | |
83 | * Returns: | |
84 | * %0 on success and a negative error value on failure. | |
85 | */ | |
d2b59bd4 | 86 | int ccwgroup_set_offline(struct ccwgroup_device *gdev, bool call_gdrv) |
dad572e3 SO |
87 | { |
88 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
cff97102 | 89 | int ret = -EINVAL; |
dad572e3 SO |
90 | |
91 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
92 | return -EAGAIN; | |
93 | if (gdev->state == CCWGROUP_OFFLINE) | |
94 | goto out; | |
d2b59bd4 AW |
95 | if (!call_gdrv) { |
96 | ret = 0; | |
97 | goto offline; | |
98 | } | |
dad572e3 SO |
99 | if (gdrv->set_offline) |
100 | ret = gdrv->set_offline(gdev); | |
101 | if (ret) | |
102 | goto out; | |
103 | ||
d2b59bd4 | 104 | offline: |
dad572e3 SO |
105 | gdev->state = CCWGROUP_OFFLINE; |
106 | out: | |
107 | atomic_set(&gdev->onoff, 0); | |
108 | return ret; | |
109 | } | |
683c3dce | 110 | EXPORT_SYMBOL(ccwgroup_set_offline); |
dad572e3 | 111 | |
dbdf1afc SO |
112 | static ssize_t ccwgroup_online_store(struct device *dev, |
113 | struct device_attribute *attr, | |
dad572e3 SO |
114 | const char *buf, size_t count) |
115 | { | |
116 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
dad572e3 SO |
117 | unsigned long value; |
118 | int ret; | |
119 | ||
d5b877ff SO |
120 | device_lock(dev); |
121 | if (!dev->driver) { | |
122 | ret = -EINVAL; | |
123 | goto out; | |
124 | } | |
dad572e3 | 125 | |
0178722b | 126 | ret = kstrtoul(buf, 0, &value); |
dad572e3 SO |
127 | if (ret) |
128 | goto out; | |
129 | ||
130 | if (value == 1) | |
131 | ret = ccwgroup_set_online(gdev); | |
132 | else if (value == 0) | |
d2b59bd4 | 133 | ret = ccwgroup_set_offline(gdev, true); |
dad572e3 SO |
134 | else |
135 | ret = -EINVAL; | |
136 | out: | |
d5b877ff | 137 | device_unlock(dev); |
dad572e3 SO |
138 | return (ret == 0) ? count : ret; |
139 | } | |
140 | ||
dbdf1afc SO |
141 | static ssize_t ccwgroup_online_show(struct device *dev, |
142 | struct device_attribute *attr, | |
dad572e3 SO |
143 | char *buf) |
144 | { | |
145 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
146 | int online; | |
147 | ||
148 | online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0; | |
149 | ||
150 | return scnprintf(buf, PAGE_SIZE, "%d\n", online); | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * Provide an 'ungroup' attribute so the user can remove group devices no | |
cada938a | 155 | * longer needed or accidentally created. Saves memory :) |
1da177e4 | 156 | */ |
0b60f9ea | 157 | static void ccwgroup_ungroup(struct ccwgroup_device *gdev) |
d9a9cdfb | 158 | { |
d76123eb | 159 | mutex_lock(&gdev->reg_mutex); |
1a908c73 CH |
160 | if (device_is_registered(&gdev->dev)) { |
161 | __ccwgroup_remove_symlinks(gdev); | |
0b60f9ea | 162 | device_unregister(&gdev->dev); |
1a908c73 | 163 | } |
d76123eb | 164 | mutex_unlock(&gdev->reg_mutex); |
d9a9cdfb AS |
165 | } |
166 | ||
dad572e3 SO |
167 | static ssize_t ccwgroup_ungroup_store(struct device *dev, |
168 | struct device_attribute *attr, | |
169 | const char *buf, size_t count) | |
1da177e4 | 170 | { |
dad572e3 | 171 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
0310c8b5 | 172 | int rc = 0; |
1da177e4 | 173 | |
c619d422 PO |
174 | /* Prevent concurrent online/offline processing and ungrouping. */ |
175 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
176 | return -EAGAIN; | |
177 | if (gdev->state != CCWGROUP_OFFLINE) { | |
178 | rc = -EINVAL; | |
179 | goto out; | |
180 | } | |
0b60f9ea TH |
181 | |
182 | if (device_remove_file_self(dev, attr)) | |
183 | ccwgroup_ungroup(gdev); | |
0310c8b5 SO |
184 | else |
185 | rc = -ENODEV; | |
c619d422 PO |
186 | out: |
187 | if (rc) { | |
0310c8b5 SO |
188 | /* Release onoff "lock" when ungrouping failed. */ |
189 | atomic_set(&gdev->onoff, 0); | |
c619d422 PO |
190 | return rc; |
191 | } | |
1da177e4 LT |
192 | return count; |
193 | } | |
1da177e4 | 194 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); |
dbdf1afc SO |
195 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); |
196 | ||
05066312 | 197 | static struct attribute *ccwgroup_dev_attrs[] = { |
dbdf1afc SO |
198 | &dev_attr_online.attr, |
199 | &dev_attr_ungroup.attr, | |
200 | NULL, | |
201 | }; | |
05066312 | 202 | ATTRIBUTE_GROUPS(ccwgroup_dev); |
1da177e4 | 203 | |
0b60f9ea TH |
204 | static void ccwgroup_ungroup_workfn(struct work_struct *work) |
205 | { | |
206 | struct ccwgroup_device *gdev = | |
207 | container_of(work, struct ccwgroup_device, ungroup_work); | |
208 | ||
209 | ccwgroup_ungroup(gdev); | |
9280ddb1 | 210 | put_device(&gdev->dev); |
0b60f9ea TH |
211 | } |
212 | ||
dad572e3 | 213 | static void ccwgroup_release(struct device *dev) |
1da177e4 | 214 | { |
197cec28 JW |
215 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
216 | unsigned int i; | |
217 | ||
218 | for (i = 0; i < gdev->count; i++) { | |
219 | struct ccw_device *cdev = gdev->cdev[i]; | |
220 | unsigned long flags; | |
221 | ||
222 | if (cdev) { | |
223 | spin_lock_irqsave(cdev->ccwlock, flags); | |
224 | if (dev_get_drvdata(&cdev->dev) == gdev) | |
225 | dev_set_drvdata(&cdev->dev, NULL); | |
226 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
227 | put_device(&cdev->dev); | |
228 | } | |
229 | } | |
230 | ||
231 | kfree(gdev); | |
1da177e4 LT |
232 | } |
233 | ||
dad572e3 | 234 | static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
1da177e4 | 235 | { |
2685df67 | 236 | char str[16]; |
1da177e4 LT |
237 | int i, rc; |
238 | ||
239 | for (i = 0; i < gdev->count; i++) { | |
dad572e3 SO |
240 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, |
241 | &gdev->dev.kobj, "group_device"); | |
1da177e4 LT |
242 | if (rc) { |
243 | for (--i; i >= 0; i--) | |
244 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
245 | "group_device"); | |
246 | return rc; | |
247 | } | |
248 | } | |
249 | for (i = 0; i < gdev->count; i++) { | |
250 | sprintf(str, "cdev%d", i); | |
dad572e3 SO |
251 | rc = sysfs_create_link(&gdev->dev.kobj, |
252 | &gdev->cdev[i]->dev.kobj, str); | |
1da177e4 LT |
253 | if (rc) { |
254 | for (--i; i >= 0; i--) { | |
255 | sprintf(str, "cdev%d", i); | |
256 | sysfs_remove_link(&gdev->dev.kobj, str); | |
257 | } | |
258 | for (i = 0; i < gdev->count; i++) | |
259 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
260 | "group_device"); | |
261 | return rc; | |
262 | } | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
b7a610f7 | 267 | static int __get_next_id(const char **buf, struct ccw_dev_id *id) |
022b660a | 268 | { |
b7a610f7 SO |
269 | unsigned int cssid, ssid, devno; |
270 | int ret = 0, len; | |
022b660a UB |
271 | char *start, *end; |
272 | ||
273 | start = (char *)*buf; | |
274 | end = strchr(start, ','); | |
275 | if (!end) { | |
276 | /* Last entry. Strip trailing newline, if applicable. */ | |
277 | end = strchr(start, '\n'); | |
278 | if (end) | |
279 | *end = '\0'; | |
280 | len = strlen(start) + 1; | |
281 | } else { | |
282 | len = end - start + 1; | |
283 | end++; | |
284 | } | |
b7a610f7 SO |
285 | if (len <= CCW_BUS_ID_SIZE) { |
286 | if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
287 | ret = -EINVAL; | |
022b660a | 288 | } else |
b7a610f7 | 289 | ret = -EINVAL; |
022b660a | 290 | |
b7a610f7 SO |
291 | if (!ret) { |
292 | id->ssid = ssid; | |
293 | id->devno = devno; | |
294 | } | |
295 | *buf = end; | |
296 | return ret; | |
022b660a UB |
297 | } |
298 | ||
b2ffd8e9 | 299 | /** |
f2962dae SO |
300 | * ccwgroup_create_dev() - create and register a ccw group device |
301 | * @parent: parent device for the new device | |
f2962dae | 302 | * @gdrv: driver for the new group device |
022b660a UB |
303 | * @num_devices: number of slave devices |
304 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 | 305 | * |
f2962dae | 306 | * Create and register a new ccw group device as a child of @parent. Slave |
b7a610f7 | 307 | * devices are obtained from the list of bus ids given in @buf. |
b2ffd8e9 CH |
308 | * Returns: |
309 | * %0 on success and an error code on failure. | |
310 | * Context: | |
311 | * non-atomic | |
1da177e4 | 312 | */ |
9814fdfb SO |
313 | int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, |
314 | int num_devices, const char *buf) | |
1da177e4 LT |
315 | { |
316 | struct ccwgroup_device *gdev; | |
b7a610f7 | 317 | struct ccw_dev_id dev_id; |
022b660a | 318 | int rc, i; |
1da177e4 | 319 | |
ab7efda4 JW |
320 | if (num_devices < 1) |
321 | return -EINVAL; | |
322 | ||
acafe7e3 | 323 | gdev = kzalloc(struct_size(gdev, cdev, num_devices), GFP_KERNEL); |
1da177e4 LT |
324 | if (!gdev) |
325 | return -ENOMEM; | |
326 | ||
1da177e4 | 327 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
328 | mutex_init(&gdev->reg_mutex); |
329 | mutex_lock(&gdev->reg_mutex); | |
0b60f9ea | 330 | INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn); |
16f7f956 PO |
331 | gdev->count = num_devices; |
332 | gdev->dev.bus = &ccwgroup_bus_type; | |
f2962dae | 333 | gdev->dev.parent = parent; |
16f7f956 PO |
334 | gdev->dev.release = ccwgroup_release; |
335 | device_initialize(&gdev->dev); | |
336 | ||
b7a610f7 SO |
337 | for (i = 0; i < num_devices && buf; i++) { |
338 | rc = __get_next_id(&buf, &dev_id); | |
022b660a UB |
339 | if (rc != 0) |
340 | goto error; | |
b7a610f7 | 341 | gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id); |
022b660a UB |
342 | /* |
343 | * All devices have to be of the same type in | |
344 | * order to be grouped. | |
345 | */ | |
b7a610f7 SO |
346 | if (!gdev->cdev[i] || !gdev->cdev[i]->drv || |
347 | gdev->cdev[i]->drv != gdev->cdev[0]->drv || | |
348 | gdev->cdev[i]->id.driver_info != | |
1da177e4 LT |
349 | gdev->cdev[0]->id.driver_info) { |
350 | rc = -EINVAL; | |
d76123eb | 351 | goto error; |
1da177e4 LT |
352 | } |
353 | /* Don't allow a device to belong to more than one group. */ | |
c560d105 | 354 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 | 355 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
c560d105 | 356 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
1da177e4 | 357 | rc = -EINVAL; |
d76123eb | 358 | goto error; |
1da177e4 | 359 | } |
db6a6423 | 360 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
c560d105 | 361 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 362 | } |
022b660a | 363 | /* Check for sufficient number of bus ids. */ |
b7a610f7 | 364 | if (i < num_devices) { |
022b660a UB |
365 | rc = -EINVAL; |
366 | goto error; | |
367 | } | |
368 | /* Check for trailing stuff. */ | |
ea298e6e | 369 | if (i == num_devices && buf && strlen(buf) > 0) { |
022b660a UB |
370 | rc = -EINVAL; |
371 | goto error; | |
372 | } | |
f9a5d70c | 373 | /* Check if the devices are bound to the required ccw driver. */ |
ab7efda4 | 374 | if (gdrv && gdrv->ccw_driver && |
f9a5d70c JW |
375 | gdev->cdev[0]->drv != gdrv->ccw_driver) { |
376 | rc = -EINVAL; | |
377 | goto error; | |
378 | } | |
1da177e4 | 379 | |
1bf5b285 | 380 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
f2962dae SO |
381 | |
382 | if (gdrv) { | |
383 | gdev->dev.driver = &gdrv->driver; | |
384 | rc = gdrv->setup ? gdrv->setup(gdev) : 0; | |
385 | if (rc) | |
386 | goto error; | |
387 | } | |
16f7f956 | 388 | rc = device_add(&gdev->dev); |
1da177e4 | 389 | if (rc) |
d76123eb | 390 | goto error; |
1da177e4 | 391 | rc = __ccwgroup_create_symlinks(gdev); |
dad572e3 SO |
392 | if (rc) { |
393 | device_del(&gdev->dev); | |
394 | goto error; | |
1da177e4 | 395 | } |
dad572e3 SO |
396 | mutex_unlock(&gdev->reg_mutex); |
397 | return 0; | |
1da177e4 | 398 | error: |
d76123eb CH |
399 | mutex_unlock(&gdev->reg_mutex); |
400 | put_device(&gdev->dev); | |
1da177e4 LT |
401 | return rc; |
402 | } | |
f2962dae SO |
403 | EXPORT_SYMBOL(ccwgroup_create_dev); |
404 | ||
e909074b | 405 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
dad572e3 SO |
406 | void *data) |
407 | { | |
0b60f9ea | 408 | struct ccwgroup_device *gdev = to_ccwgroupdev(data); |
dad572e3 | 409 | |
17c0b86e | 410 | if (action == BUS_NOTIFY_UNBOUND_DRIVER) { |
9280ddb1 | 411 | get_device(&gdev->dev); |
0b60f9ea | 412 | schedule_work(&gdev->ungroup_work); |
9280ddb1 | 413 | } |
dad572e3 SO |
414 | |
415 | return NOTIFY_OK; | |
416 | } | |
e909074b SO |
417 | |
418 | static struct notifier_block ccwgroup_nb = { | |
419 | .notifier_call = ccwgroup_notifier | |
420 | }; | |
421 | ||
422 | static int __init init_ccwgroup(void) | |
1da177e4 | 423 | { |
e909074b SO |
424 | int ret; |
425 | ||
426 | ret = bus_register(&ccwgroup_bus_type); | |
427 | if (ret) | |
428 | return ret; | |
429 | ||
430 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); | |
431 | if (ret) | |
432 | bus_unregister(&ccwgroup_bus_type); | |
433 | ||
434 | return ret; | |
1da177e4 LT |
435 | } |
436 | ||
e909074b | 437 | static void __exit cleanup_ccwgroup(void) |
1da177e4 | 438 | { |
e909074b SO |
439 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
440 | bus_unregister(&ccwgroup_bus_type); | |
1da177e4 LT |
441 | } |
442 | ||
443 | module_init(init_ccwgroup); | |
444 | module_exit(cleanup_ccwgroup); | |
445 | ||
446 | /************************** driver stuff ******************************/ | |
447 | ||
fc7a6209 | 448 | static void ccwgroup_remove(struct device *dev) |
1da177e4 | 449 | { |
dad572e3 SO |
450 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
451 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
1da177e4 | 452 | |
50f15483 | 453 | if (gdrv->remove) |
1da177e4 | 454 | gdrv->remove(gdev); |
1da177e4 LT |
455 | } |
456 | ||
01bc8ad1 CH |
457 | static void ccwgroup_shutdown(struct device *dev) |
458 | { | |
dad572e3 SO |
459 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
460 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
01bc8ad1 | 461 | |
50f15483 SO |
462 | if (!dev->driver) |
463 | return; | |
50f15483 | 464 | if (gdrv->shutdown) |
01bc8ad1 CH |
465 | gdrv->shutdown(gdev); |
466 | } | |
467 | ||
f9ccf456 RK |
468 | static struct bus_type ccwgroup_bus_type = { |
469 | .name = "ccwgroup", | |
05066312 | 470 | .dev_groups = ccwgroup_dev_groups, |
f9ccf456 | 471 | .remove = ccwgroup_remove, |
01bc8ad1 | 472 | .shutdown = ccwgroup_shutdown, |
f9ccf456 RK |
473 | }; |
474 | ||
a166c368 SO |
475 | bool dev_is_ccwgroup(struct device *dev) |
476 | { | |
477 | return dev->bus == &ccwgroup_bus_type; | |
478 | } | |
479 | EXPORT_SYMBOL(dev_is_ccwgroup); | |
480 | ||
b2ffd8e9 CH |
481 | /** |
482 | * ccwgroup_driver_register() - register a ccw group driver | |
483 | * @cdriver: driver to be registered | |
484 | * | |
485 | * This function is mainly a wrapper around driver_register(). | |
486 | */ | |
487 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
488 | { |
489 | /* register our new driver with the core */ | |
292888c8 | 490 | cdriver->driver.bus = &ccwgroup_bus_type; |
1da177e4 LT |
491 | |
492 | return driver_register(&cdriver->driver); | |
493 | } | |
dad572e3 | 494 | EXPORT_SYMBOL(ccwgroup_driver_register); |
1da177e4 | 495 | |
b2ffd8e9 CH |
496 | /** |
497 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
498 | * @cdriver: driver to be deregistered | |
499 | * | |
500 | * This function is mainly a wrapper around driver_unregister(). | |
501 | */ | |
502 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 503 | { |
1da177e4 LT |
504 | driver_unregister(&cdriver->driver); |
505 | } | |
dad572e3 | 506 | EXPORT_SYMBOL(ccwgroup_driver_unregister); |
1da177e4 | 507 | |
b2ffd8e9 CH |
508 | /** |
509 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
510 | * @cdev: ccw device to be probed | |
511 | * | |
512 | * This is a dummy probe function for ccw devices that are slave devices in | |
513 | * a ccw group device. | |
514 | * Returns: | |
515 | * always %0 | |
516 | */ | |
517 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
518 | { |
519 | return 0; | |
520 | } | |
dad572e3 | 521 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
1da177e4 | 522 | |
b2ffd8e9 CH |
523 | /** |
524 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
525 | * @cdev: ccw device to be removed | |
526 | * | |
527 | * This is a remove function for ccw devices that are slave devices in a ccw | |
528 | * group device. It sets the ccw device offline and also deregisters the | |
529 | * embedding ccw group device. | |
530 | */ | |
531 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
532 | { |
533 | struct ccwgroup_device *gdev; | |
534 | ||
535 | /* Ignore offlining errors, device is gone anyway. */ | |
536 | ccw_device_set_offline(cdev); | |
537 | /* If one of its devices is gone, the whole group is done for. */ | |
c0301754 PO |
538 | spin_lock_irq(cdev->ccwlock); |
539 | gdev = dev_get_drvdata(&cdev->dev); | |
540 | if (!gdev) { | |
541 | spin_unlock_irq(cdev->ccwlock); | |
542 | return; | |
543 | } | |
544 | /* Get ccwgroup device reference for local processing. */ | |
545 | get_device(&gdev->dev); | |
546 | spin_unlock_irq(cdev->ccwlock); | |
547 | /* Unregister group device. */ | |
fa73eb47 | 548 | ccwgroup_ungroup(gdev); |
c0301754 PO |
549 | /* Release ccwgroup device reference for local processing. */ |
550 | put_device(&gdev->dev); | |
1da177e4 | 551 | } |
1da177e4 | 552 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |
dad572e3 | 553 | MODULE_LICENSE("GPL"); |