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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]) { |
c560d105 | 126 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
f26fd5d6 CH |
127 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
128 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
c560d105 | 129 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
16f7f956 PO |
130 | put_device(&gdev->cdev[i]->dev); |
131 | } | |
1da177e4 LT |
132 | } |
133 | kfree(gdev); | |
134 | } | |
135 | ||
4d284cac | 136 | static int |
1da177e4 LT |
137 | __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
138 | { | |
139 | char str[8]; | |
140 | int i, rc; | |
141 | ||
142 | for (i = 0; i < gdev->count; i++) { | |
143 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj, | |
144 | "group_device"); | |
145 | if (rc) { | |
146 | for (--i; i >= 0; i--) | |
147 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
148 | "group_device"); | |
149 | return rc; | |
150 | } | |
151 | } | |
152 | for (i = 0; i < gdev->count; i++) { | |
153 | sprintf(str, "cdev%d", i); | |
154 | rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj, | |
155 | str); | |
156 | if (rc) { | |
157 | for (--i; i >= 0; i--) { | |
158 | sprintf(str, "cdev%d", i); | |
159 | sysfs_remove_link(&gdev->dev.kobj, str); | |
160 | } | |
161 | for (i = 0; i < gdev->count; i++) | |
162 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
163 | "group_device"); | |
164 | return rc; | |
165 | } | |
166 | } | |
167 | return 0; | |
168 | } | |
169 | ||
022b660a UB |
170 | static int __get_next_bus_id(const char **buf, char *bus_id) |
171 | { | |
172 | int rc, len; | |
173 | char *start, *end; | |
174 | ||
175 | start = (char *)*buf; | |
176 | end = strchr(start, ','); | |
177 | if (!end) { | |
178 | /* Last entry. Strip trailing newline, if applicable. */ | |
179 | end = strchr(start, '\n'); | |
180 | if (end) | |
181 | *end = '\0'; | |
182 | len = strlen(start) + 1; | |
183 | } else { | |
184 | len = end - start + 1; | |
185 | end++; | |
186 | } | |
98df67b3 | 187 | if (len < CCW_BUS_ID_SIZE) { |
022b660a UB |
188 | strlcpy(bus_id, start, len); |
189 | rc = 0; | |
190 | } else | |
191 | rc = -EINVAL; | |
192 | *buf = end; | |
193 | return rc; | |
194 | } | |
195 | ||
98df67b3 | 196 | static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE]) |
022b660a UB |
197 | { |
198 | int cssid, ssid, devno; | |
199 | ||
200 | /* Must be of form %x.%x.%04x */ | |
201 | if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
202 | return 0; | |
203 | return 1; | |
204 | } | |
205 | ||
b2ffd8e9 | 206 | /** |
022b660a | 207 | * ccwgroup_create_from_string() - create and register a ccw group device |
b2ffd8e9 CH |
208 | * @root: parent device for the new device |
209 | * @creator_id: identifier of creating driver | |
210 | * @cdrv: ccw driver of slave devices | |
022b660a UB |
211 | * @num_devices: number of slave devices |
212 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 CH |
213 | * |
214 | * Create and register a new ccw group device as a child of @root. Slave | |
022b660a | 215 | * devices are obtained from the list of bus ids given in @buf and must all |
b2ffd8e9 CH |
216 | * belong to @cdrv. |
217 | * Returns: | |
218 | * %0 on success and an error code on failure. | |
219 | * Context: | |
220 | * non-atomic | |
1da177e4 | 221 | */ |
022b660a UB |
222 | int ccwgroup_create_from_string(struct device *root, unsigned int creator_id, |
223 | struct ccw_driver *cdrv, int num_devices, | |
224 | const char *buf) | |
1da177e4 LT |
225 | { |
226 | struct ccwgroup_device *gdev; | |
022b660a | 227 | int rc, i; |
98df67b3 | 228 | char tmp_bus_id[CCW_BUS_ID_SIZE]; |
022b660a | 229 | const char *curr_buf; |
1da177e4 | 230 | |
022b660a UB |
231 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
232 | GFP_KERNEL); | |
1da177e4 LT |
233 | if (!gdev) |
234 | return -ENOMEM; | |
235 | ||
1da177e4 | 236 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
237 | mutex_init(&gdev->reg_mutex); |
238 | mutex_lock(&gdev->reg_mutex); | |
16f7f956 PO |
239 | gdev->creator_id = creator_id; |
240 | gdev->count = num_devices; | |
241 | gdev->dev.bus = &ccwgroup_bus_type; | |
242 | gdev->dev.parent = root; | |
243 | gdev->dev.release = ccwgroup_release; | |
244 | device_initialize(&gdev->dev); | |
245 | ||
022b660a UB |
246 | curr_buf = buf; |
247 | for (i = 0; i < num_devices && curr_buf; i++) { | |
248 | rc = __get_next_bus_id(&curr_buf, tmp_bus_id); | |
249 | if (rc != 0) | |
250 | goto error; | |
251 | if (!__is_valid_bus_id(tmp_bus_id)) { | |
252 | rc = -EINVAL; | |
253 | goto error; | |
254 | } | |
255 | gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id); | |
256 | /* | |
257 | * All devices have to be of the same type in | |
258 | * order to be grouped. | |
259 | */ | |
1da177e4 LT |
260 | if (!gdev->cdev[i] |
261 | || gdev->cdev[i]->id.driver_info != | |
262 | gdev->cdev[0]->id.driver_info) { | |
263 | rc = -EINVAL; | |
d76123eb | 264 | goto error; |
1da177e4 LT |
265 | } |
266 | /* Don't allow a device to belong to more than one group. */ | |
c560d105 | 267 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 | 268 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
c560d105 | 269 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
1da177e4 | 270 | rc = -EINVAL; |
d76123eb | 271 | goto error; |
1da177e4 | 272 | } |
db6a6423 | 273 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
c560d105 | 274 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 275 | } |
022b660a UB |
276 | /* Check for sufficient number of bus ids. */ |
277 | if (i < num_devices && !curr_buf) { | |
278 | rc = -EINVAL; | |
279 | goto error; | |
280 | } | |
281 | /* Check for trailing stuff. */ | |
282 | if (i == num_devices && strlen(curr_buf) > 0) { | |
283 | rc = -EINVAL; | |
284 | goto error; | |
285 | } | |
1da177e4 | 286 | |
1bf5b285 | 287 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
1da177e4 | 288 | |
16f7f956 | 289 | rc = device_add(&gdev->dev); |
1da177e4 | 290 | if (rc) |
d76123eb | 291 | goto error; |
1da177e4 LT |
292 | get_device(&gdev->dev); |
293 | rc = device_create_file(&gdev->dev, &dev_attr_ungroup); | |
294 | ||
295 | if (rc) { | |
296 | device_unregister(&gdev->dev); | |
297 | goto error; | |
298 | } | |
299 | ||
300 | rc = __ccwgroup_create_symlinks(gdev); | |
301 | if (!rc) { | |
d76123eb | 302 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
303 | put_device(&gdev->dev); |
304 | return 0; | |
305 | } | |
306 | device_remove_file(&gdev->dev, &dev_attr_ungroup); | |
307 | device_unregister(&gdev->dev); | |
308 | error: | |
022b660a | 309 | for (i = 0; i < num_devices; i++) |
1da177e4 | 310 | if (gdev->cdev[i]) { |
c560d105 | 311 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 CH |
312 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
313 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
c560d105 | 314 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 315 | put_device(&gdev->cdev[i]->dev); |
f26fd5d6 | 316 | gdev->cdev[i] = NULL; |
1da177e4 | 317 | } |
d76123eb CH |
318 | mutex_unlock(&gdev->reg_mutex); |
319 | put_device(&gdev->dev); | |
1da177e4 LT |
320 | return rc; |
321 | } | |
022b660a | 322 | EXPORT_SYMBOL(ccwgroup_create_from_string); |
1da177e4 | 323 | |
e909074b SO |
324 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
325 | void *data); | |
326 | ||
327 | static struct notifier_block ccwgroup_nb = { | |
328 | .notifier_call = ccwgroup_notifier | |
329 | }; | |
330 | ||
331 | static int __init init_ccwgroup(void) | |
1da177e4 | 332 | { |
e909074b SO |
333 | int ret; |
334 | ||
335 | ret = bus_register(&ccwgroup_bus_type); | |
336 | if (ret) | |
337 | return ret; | |
338 | ||
339 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); | |
340 | if (ret) | |
341 | bus_unregister(&ccwgroup_bus_type); | |
342 | ||
343 | return ret; | |
1da177e4 LT |
344 | } |
345 | ||
e909074b | 346 | static void __exit cleanup_ccwgroup(void) |
1da177e4 | 347 | { |
e909074b SO |
348 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
349 | bus_unregister(&ccwgroup_bus_type); | |
1da177e4 LT |
350 | } |
351 | ||
352 | module_init(init_ccwgroup); | |
353 | module_exit(cleanup_ccwgroup); | |
354 | ||
355 | /************************** driver stuff ******************************/ | |
356 | ||
357 | static int | |
358 | ccwgroup_set_online(struct ccwgroup_device *gdev) | |
359 | { | |
360 | struct ccwgroup_driver *gdrv; | |
361 | int ret; | |
362 | ||
973bd993 | 363 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
364 | return -EAGAIN; |
365 | if (gdev->state == CCWGROUP_ONLINE) { | |
366 | ret = 0; | |
367 | goto out; | |
368 | } | |
369 | if (!gdev->dev.driver) { | |
370 | ret = -EINVAL; | |
371 | goto out; | |
372 | } | |
373 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 374 | if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0)) |
1da177e4 LT |
375 | goto out; |
376 | ||
377 | gdev->state = CCWGROUP_ONLINE; | |
378 | out: | |
379 | atomic_set(&gdev->onoff, 0); | |
380 | return ret; | |
381 | } | |
382 | ||
383 | static int | |
384 | ccwgroup_set_offline(struct ccwgroup_device *gdev) | |
385 | { | |
386 | struct ccwgroup_driver *gdrv; | |
387 | int ret; | |
388 | ||
973bd993 | 389 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
390 | return -EAGAIN; |
391 | if (gdev->state == CCWGROUP_OFFLINE) { | |
392 | ret = 0; | |
393 | goto out; | |
394 | } | |
395 | if (!gdev->dev.driver) { | |
396 | ret = -EINVAL; | |
397 | goto out; | |
398 | } | |
399 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 400 | if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0)) |
1da177e4 LT |
401 | goto out; |
402 | ||
403 | gdev->state = CCWGROUP_OFFLINE; | |
404 | out: | |
405 | atomic_set(&gdev->onoff, 0); | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static ssize_t | |
3fd3c0a5 | 410 | ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
411 | { |
412 | struct ccwgroup_device *gdev; | |
413 | struct ccwgroup_driver *gdrv; | |
2f972202 | 414 | unsigned long value; |
1da177e4 LT |
415 | int ret; |
416 | ||
1da177e4 | 417 | if (!dev->driver) |
40c9f999 SO |
418 | return -ENODEV; |
419 | ||
420 | gdev = to_ccwgroupdev(dev); | |
421 | gdrv = to_ccwgroupdrv(dev->driver); | |
1da177e4 | 422 | |
1da177e4 LT |
423 | if (!try_module_get(gdrv->owner)) |
424 | return -EINVAL; | |
425 | ||
2f972202 CH |
426 | ret = strict_strtoul(buf, 0, &value); |
427 | if (ret) | |
428 | goto out; | |
40c9f999 | 429 | |
1da177e4 | 430 | if (value == 1) |
40c9f999 | 431 | ret = ccwgroup_set_online(gdev); |
1da177e4 | 432 | else if (value == 0) |
40c9f999 | 433 | ret = ccwgroup_set_offline(gdev); |
1da177e4 LT |
434 | else |
435 | ret = -EINVAL; | |
2f972202 | 436 | out: |
1da177e4 | 437 | module_put(gdrv->owner); |
40c9f999 | 438 | return (ret == 0) ? count : ret; |
1da177e4 LT |
439 | } |
440 | ||
441 | static ssize_t | |
3fd3c0a5 | 442 | ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
443 | { |
444 | int online; | |
445 | ||
446 | online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE); | |
447 | ||
448 | return sprintf(buf, online ? "1\n" : "0\n"); | |
449 | } | |
450 | ||
451 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); | |
452 | ||
453 | static int | |
454 | ccwgroup_probe (struct device *dev) | |
455 | { | |
456 | struct ccwgroup_device *gdev; | |
457 | struct ccwgroup_driver *gdrv; | |
458 | ||
459 | int ret; | |
460 | ||
461 | gdev = to_ccwgroupdev(dev); | |
462 | gdrv = to_ccwgroupdrv(dev->driver); | |
463 | ||
464 | if ((ret = device_create_file(dev, &dev_attr_online))) | |
465 | return ret; | |
466 | ||
1da177e4 LT |
467 | ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV; |
468 | if (ret) | |
469 | device_remove_file(dev, &dev_attr_online); | |
470 | ||
471 | return ret; | |
472 | } | |
473 | ||
474 | static int | |
475 | ccwgroup_remove (struct device *dev) | |
476 | { | |
477 | struct ccwgroup_device *gdev; | |
478 | struct ccwgroup_driver *gdrv; | |
479 | ||
50f15483 | 480 | device_remove_file(dev, &dev_attr_online); |
e909074b | 481 | device_remove_file(dev, &dev_attr_ungroup); |
50f15483 SO |
482 | |
483 | if (!dev->driver) | |
484 | return 0; | |
485 | ||
1da177e4 LT |
486 | gdev = to_ccwgroupdev(dev); |
487 | gdrv = to_ccwgroupdrv(dev->driver); | |
488 | ||
50f15483 | 489 | if (gdrv->remove) |
1da177e4 | 490 | gdrv->remove(gdev); |
50f15483 | 491 | |
1da177e4 LT |
492 | return 0; |
493 | } | |
494 | ||
01bc8ad1 CH |
495 | static void ccwgroup_shutdown(struct device *dev) |
496 | { | |
497 | struct ccwgroup_device *gdev; | |
498 | struct ccwgroup_driver *gdrv; | |
499 | ||
50f15483 SO |
500 | if (!dev->driver) |
501 | return; | |
502 | ||
01bc8ad1 CH |
503 | gdev = to_ccwgroupdev(dev); |
504 | gdrv = to_ccwgroupdrv(dev->driver); | |
50f15483 SO |
505 | |
506 | if (gdrv->shutdown) | |
01bc8ad1 CH |
507 | gdrv->shutdown(gdev); |
508 | } | |
509 | ||
7e597a21 SO |
510 | static int ccwgroup_pm_prepare(struct device *dev) |
511 | { | |
512 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
513 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
514 | ||
515 | /* Fail while device is being set online/offline. */ | |
516 | if (atomic_read(&gdev->onoff)) | |
517 | return -EAGAIN; | |
518 | ||
519 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
520 | return 0; | |
521 | ||
522 | return gdrv->prepare ? gdrv->prepare(gdev) : 0; | |
523 | } | |
524 | ||
525 | static void ccwgroup_pm_complete(struct device *dev) | |
526 | { | |
527 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
528 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
529 | ||
530 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
531 | return; | |
532 | ||
533 | if (gdrv->complete) | |
534 | gdrv->complete(gdev); | |
535 | } | |
536 | ||
537 | static int ccwgroup_pm_freeze(struct device *dev) | |
538 | { | |
539 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
540 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
541 | ||
542 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
543 | return 0; | |
544 | ||
545 | return gdrv->freeze ? gdrv->freeze(gdev) : 0; | |
546 | } | |
547 | ||
548 | static int ccwgroup_pm_thaw(struct device *dev) | |
549 | { | |
550 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
551 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
552 | ||
553 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
554 | return 0; | |
555 | ||
556 | return gdrv->thaw ? gdrv->thaw(gdev) : 0; | |
557 | } | |
558 | ||
559 | static int ccwgroup_pm_restore(struct device *dev) | |
560 | { | |
561 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
562 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
563 | ||
564 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
565 | return 0; | |
566 | ||
567 | return gdrv->restore ? gdrv->restore(gdev) : 0; | |
568 | } | |
569 | ||
47145210 | 570 | static const struct dev_pm_ops ccwgroup_pm_ops = { |
7e597a21 SO |
571 | .prepare = ccwgroup_pm_prepare, |
572 | .complete = ccwgroup_pm_complete, | |
573 | .freeze = ccwgroup_pm_freeze, | |
574 | .thaw = ccwgroup_pm_thaw, | |
575 | .restore = ccwgroup_pm_restore, | |
576 | }; | |
577 | ||
f9ccf456 RK |
578 | static struct bus_type ccwgroup_bus_type = { |
579 | .name = "ccwgroup", | |
580 | .match = ccwgroup_bus_match, | |
581 | .uevent = ccwgroup_uevent, | |
582 | .probe = ccwgroup_probe, | |
583 | .remove = ccwgroup_remove, | |
01bc8ad1 | 584 | .shutdown = ccwgroup_shutdown, |
7e597a21 | 585 | .pm = &ccwgroup_pm_ops, |
f9ccf456 RK |
586 | }; |
587 | ||
e909074b SO |
588 | |
589 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, | |
590 | void *data) | |
591 | { | |
592 | struct device *dev = data; | |
593 | ||
594 | if (action == BUS_NOTIFY_UNBIND_DRIVER) | |
595 | device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
596 | ||
597 | return NOTIFY_OK; | |
598 | } | |
599 | ||
600 | ||
b2ffd8e9 CH |
601 | /** |
602 | * ccwgroup_driver_register() - register a ccw group driver | |
603 | * @cdriver: driver to be registered | |
604 | * | |
605 | * This function is mainly a wrapper around driver_register(). | |
606 | */ | |
607 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
608 | { |
609 | /* register our new driver with the core */ | |
292888c8 HC |
610 | cdriver->driver.bus = &ccwgroup_bus_type; |
611 | cdriver->driver.name = cdriver->name; | |
4beee646 | 612 | cdriver->driver.owner = cdriver->owner; |
1da177e4 LT |
613 | |
614 | return driver_register(&cdriver->driver); | |
615 | } | |
616 | ||
b0744bd2 | 617 | static int |
887ab599 | 618 | __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 619 | { |
887ab599 | 620 | return 1; |
1da177e4 LT |
621 | } |
622 | ||
b2ffd8e9 CH |
623 | /** |
624 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
625 | * @cdriver: driver to be deregistered | |
626 | * | |
627 | * This function is mainly a wrapper around driver_unregister(). | |
628 | */ | |
629 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 630 | { |
887ab599 CH |
631 | struct device *dev; |
632 | ||
1da177e4 LT |
633 | /* We don't want ccwgroup devices to live longer than their driver. */ |
634 | get_driver(&cdriver->driver); | |
887ab599 CH |
635 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
636 | __ccwgroup_match_all))) { | |
d76123eb CH |
637 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
638 | ||
639 | mutex_lock(&gdev->reg_mutex); | |
640 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 641 | device_unregister(dev); |
d76123eb | 642 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
643 | put_device(dev); |
644 | } | |
1da177e4 LT |
645 | put_driver(&cdriver->driver); |
646 | driver_unregister(&cdriver->driver); | |
647 | } | |
648 | ||
b2ffd8e9 CH |
649 | /** |
650 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
651 | * @cdev: ccw device to be probed | |
652 | * | |
653 | * This is a dummy probe function for ccw devices that are slave devices in | |
654 | * a ccw group device. | |
655 | * Returns: | |
656 | * always %0 | |
657 | */ | |
658 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
659 | { |
660 | return 0; | |
661 | } | |
662 | ||
4d284cac | 663 | static struct ccwgroup_device * |
1da177e4 LT |
664 | __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev) |
665 | { | |
666 | struct ccwgroup_device *gdev; | |
667 | ||
db6a6423 CH |
668 | gdev = dev_get_drvdata(&cdev->dev); |
669 | if (gdev) { | |
1da177e4 | 670 | if (get_device(&gdev->dev)) { |
d76123eb | 671 | mutex_lock(&gdev->reg_mutex); |
d305ef5d | 672 | if (device_is_registered(&gdev->dev)) |
1da177e4 | 673 | return gdev; |
d76123eb | 674 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
675 | put_device(&gdev->dev); |
676 | } | |
677 | return NULL; | |
678 | } | |
679 | return NULL; | |
680 | } | |
681 | ||
b2ffd8e9 CH |
682 | /** |
683 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
684 | * @cdev: ccw device to be removed | |
685 | * | |
686 | * This is a remove function for ccw devices that are slave devices in a ccw | |
687 | * group device. It sets the ccw device offline and also deregisters the | |
688 | * embedding ccw group device. | |
689 | */ | |
690 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
691 | { |
692 | struct ccwgroup_device *gdev; | |
693 | ||
694 | /* Ignore offlining errors, device is gone anyway. */ | |
695 | ccw_device_set_offline(cdev); | |
696 | /* If one of its devices is gone, the whole group is done for. */ | |
697 | gdev = __ccwgroup_get_gdev_by_cdev(cdev); | |
698 | if (gdev) { | |
699 | __ccwgroup_remove_symlinks(gdev); | |
700 | device_unregister(&gdev->dev); | |
d76123eb | 701 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
702 | put_device(&gdev->dev); |
703 | } | |
704 | } | |
705 | ||
706 | MODULE_LICENSE("GPL"); | |
707 | EXPORT_SYMBOL(ccwgroup_driver_register); | |
708 | EXPORT_SYMBOL(ccwgroup_driver_unregister); | |
1da177e4 LT |
709 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
710 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |