Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * bus driver for ccwgroup |
1da177e4 | 3 | * |
f2962dae | 4 | * Copyright IBM Corp. 2002, 2012 |
7e597a21 SO |
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 | ||
b7a610f7 | 18 | #include <asm/cio.h> |
1da177e4 LT |
19 | #include <asm/ccwdev.h> |
20 | #include <asm/ccwgroup.h> | |
21 | ||
b7a610f7 SO |
22 | #include "device.h" |
23 | ||
24 | #define CCW_BUS_ID_SIZE 10 | |
98df67b3 | 25 | |
1da177e4 LT |
26 | /* In Linux 2.4, we had a channel device layer called "chandev" |
27 | * that did all sorts of obscure stuff for networking devices. | |
28 | * This is another driver that serves as a replacement for just | |
29 | * one of its functions, namely the translation of single subchannels | |
30 | * to devices that use multiple subchannels. | |
31 | */ | |
32 | ||
f9ccf456 | 33 | static struct bus_type ccwgroup_bus_type; |
1da177e4 | 34 | |
dad572e3 | 35 | static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) |
1da177e4 LT |
36 | { |
37 | int i; | |
38 | char str[8]; | |
39 | ||
40 | for (i = 0; i < gdev->count; i++) { | |
41 | sprintf(str, "cdev%d", i); | |
42 | sysfs_remove_link(&gdev->dev.kobj, str); | |
43 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); | |
44 | } | |
1da177e4 LT |
45 | } |
46 | ||
c0301754 PO |
47 | /* |
48 | * Remove references from ccw devices to ccw group device and from | |
49 | * ccw group device to ccw devices. | |
50 | */ | |
51 | static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev) | |
52 | { | |
53 | struct ccw_device *cdev; | |
54 | int i; | |
55 | ||
56 | for (i = 0; i < gdev->count; i++) { | |
57 | cdev = gdev->cdev[i]; | |
58 | if (!cdev) | |
59 | continue; | |
60 | spin_lock_irq(cdev->ccwlock); | |
61 | dev_set_drvdata(&cdev->dev, NULL); | |
62 | spin_unlock_irq(cdev->ccwlock); | |
63 | gdev->cdev[i] = NULL; | |
64 | put_device(&cdev->dev); | |
65 | } | |
66 | } | |
67 | ||
683c3dce SO |
68 | /** |
69 | * ccwgroup_set_online() - enable a ccwgroup device | |
70 | * @gdev: target ccwgroup device | |
71 | * | |
72 | * This function attempts to put the ccwgroup device into the online state. | |
73 | * Returns: | |
74 | * %0 on success and a negative error value on failure. | |
75 | */ | |
76 | int ccwgroup_set_online(struct ccwgroup_device *gdev) | |
dad572e3 SO |
77 | { |
78 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
cff97102 | 79 | int ret = -EINVAL; |
dad572e3 SO |
80 | |
81 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
82 | return -EAGAIN; | |
83 | if (gdev->state == CCWGROUP_ONLINE) | |
84 | goto out; | |
85 | if (gdrv->set_online) | |
86 | ret = gdrv->set_online(gdev); | |
87 | if (ret) | |
88 | goto out; | |
89 | ||
90 | gdev->state = CCWGROUP_ONLINE; | |
91 | out: | |
92 | atomic_set(&gdev->onoff, 0); | |
93 | return ret; | |
94 | } | |
683c3dce | 95 | EXPORT_SYMBOL(ccwgroup_set_online); |
dad572e3 | 96 | |
683c3dce SO |
97 | /** |
98 | * ccwgroup_set_offline() - disable a ccwgroup device | |
99 | * @gdev: target ccwgroup device | |
100 | * | |
101 | * This function attempts to put the ccwgroup device into the offline state. | |
102 | * Returns: | |
103 | * %0 on success and a negative error value on failure. | |
104 | */ | |
105 | int ccwgroup_set_offline(struct ccwgroup_device *gdev) | |
dad572e3 SO |
106 | { |
107 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
cff97102 | 108 | int ret = -EINVAL; |
dad572e3 SO |
109 | |
110 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
111 | return -EAGAIN; | |
112 | if (gdev->state == CCWGROUP_OFFLINE) | |
113 | goto out; | |
114 | if (gdrv->set_offline) | |
115 | ret = gdrv->set_offline(gdev); | |
116 | if (ret) | |
117 | goto out; | |
118 | ||
119 | gdev->state = CCWGROUP_OFFLINE; | |
120 | out: | |
121 | atomic_set(&gdev->onoff, 0); | |
122 | return ret; | |
123 | } | |
683c3dce | 124 | EXPORT_SYMBOL(ccwgroup_set_offline); |
dad572e3 | 125 | |
dbdf1afc SO |
126 | static ssize_t ccwgroup_online_store(struct device *dev, |
127 | struct device_attribute *attr, | |
dad572e3 SO |
128 | const char *buf, size_t count) |
129 | { | |
130 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
131 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
132 | unsigned long value; | |
133 | int ret; | |
134 | ||
135 | if (!dev->driver) | |
136 | return -EINVAL; | |
137 | if (!try_module_get(gdrv->driver.owner)) | |
138 | return -EINVAL; | |
139 | ||
140 | ret = strict_strtoul(buf, 0, &value); | |
141 | if (ret) | |
142 | goto out; | |
143 | ||
144 | if (value == 1) | |
145 | ret = ccwgroup_set_online(gdev); | |
146 | else if (value == 0) | |
147 | ret = ccwgroup_set_offline(gdev); | |
148 | else | |
149 | ret = -EINVAL; | |
150 | out: | |
151 | module_put(gdrv->driver.owner); | |
152 | return (ret == 0) ? count : ret; | |
153 | } | |
154 | ||
dbdf1afc SO |
155 | static ssize_t ccwgroup_online_show(struct device *dev, |
156 | struct device_attribute *attr, | |
dad572e3 SO |
157 | char *buf) |
158 | { | |
159 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
160 | int online; | |
161 | ||
162 | online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0; | |
163 | ||
164 | return scnprintf(buf, PAGE_SIZE, "%d\n", online); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /* |
168 | * Provide an 'ungroup' attribute so the user can remove group devices no | |
169 | * longer needed or accidentially created. Saves memory :) | |
170 | */ | |
d9a9cdfb AS |
171 | static void ccwgroup_ungroup_callback(struct device *dev) |
172 | { | |
173 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
174 | ||
d76123eb | 175 | mutex_lock(&gdev->reg_mutex); |
1a908c73 CH |
176 | if (device_is_registered(&gdev->dev)) { |
177 | __ccwgroup_remove_symlinks(gdev); | |
178 | device_unregister(dev); | |
c0301754 | 179 | __ccwgroup_remove_cdev_refs(gdev); |
1a908c73 | 180 | } |
d76123eb | 181 | mutex_unlock(&gdev->reg_mutex); |
d9a9cdfb AS |
182 | } |
183 | ||
dad572e3 SO |
184 | static ssize_t ccwgroup_ungroup_store(struct device *dev, |
185 | struct device_attribute *attr, | |
186 | const char *buf, size_t count) | |
1da177e4 | 187 | { |
dad572e3 | 188 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
d9a9cdfb | 189 | int rc; |
1da177e4 | 190 | |
c619d422 PO |
191 | /* Prevent concurrent online/offline processing and ungrouping. */ |
192 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
193 | return -EAGAIN; | |
194 | if (gdev->state != CCWGROUP_OFFLINE) { | |
195 | rc = -EINVAL; | |
196 | goto out; | |
197 | } | |
d9a9cdfb AS |
198 | /* Note that we cannot unregister the device from one of its |
199 | * attribute methods, so we have to use this roundabout approach. | |
200 | */ | |
201 | rc = device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
c619d422 PO |
202 | out: |
203 | if (rc) { | |
66942064 AC |
204 | if (rc != -EAGAIN) |
205 | /* Release onoff "lock" when ungrouping failed. */ | |
206 | atomic_set(&gdev->onoff, 0); | |
c619d422 PO |
207 | return rc; |
208 | } | |
1da177e4 LT |
209 | return count; |
210 | } | |
1da177e4 | 211 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); |
dbdf1afc SO |
212 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); |
213 | ||
214 | static struct attribute *ccwgroup_attrs[] = { | |
215 | &dev_attr_online.attr, | |
216 | &dev_attr_ungroup.attr, | |
217 | NULL, | |
218 | }; | |
219 | static struct attribute_group ccwgroup_attr_group = { | |
220 | .attrs = ccwgroup_attrs, | |
221 | }; | |
222 | static const struct attribute_group *ccwgroup_attr_groups[] = { | |
223 | &ccwgroup_attr_group, | |
224 | NULL, | |
225 | }; | |
1da177e4 | 226 | |
dad572e3 | 227 | static void ccwgroup_release(struct device *dev) |
1da177e4 | 228 | { |
c0301754 | 229 | kfree(to_ccwgroupdev(dev)); |
1da177e4 LT |
230 | } |
231 | ||
dad572e3 | 232 | static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
1da177e4 LT |
233 | { |
234 | char str[8]; | |
235 | int i, rc; | |
236 | ||
237 | for (i = 0; i < gdev->count; i++) { | |
dad572e3 SO |
238 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, |
239 | &gdev->dev.kobj, "group_device"); | |
1da177e4 LT |
240 | if (rc) { |
241 | for (--i; i >= 0; i--) | |
242 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
243 | "group_device"); | |
244 | return rc; | |
245 | } | |
246 | } | |
247 | for (i = 0; i < gdev->count; i++) { | |
248 | sprintf(str, "cdev%d", i); | |
dad572e3 SO |
249 | rc = sysfs_create_link(&gdev->dev.kobj, |
250 | &gdev->cdev[i]->dev.kobj, str); | |
1da177e4 LT |
251 | if (rc) { |
252 | for (--i; i >= 0; i--) { | |
253 | sprintf(str, "cdev%d", i); | |
254 | sysfs_remove_link(&gdev->dev.kobj, str); | |
255 | } | |
256 | for (i = 0; i < gdev->count; i++) | |
257 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
258 | "group_device"); | |
259 | return rc; | |
260 | } | |
261 | } | |
262 | return 0; | |
263 | } | |
264 | ||
b7a610f7 | 265 | static int __get_next_id(const char **buf, struct ccw_dev_id *id) |
022b660a | 266 | { |
b7a610f7 SO |
267 | unsigned int cssid, ssid, devno; |
268 | int ret = 0, len; | |
022b660a UB |
269 | char *start, *end; |
270 | ||
271 | start = (char *)*buf; | |
272 | end = strchr(start, ','); | |
273 | if (!end) { | |
274 | /* Last entry. Strip trailing newline, if applicable. */ | |
275 | end = strchr(start, '\n'); | |
276 | if (end) | |
277 | *end = '\0'; | |
278 | len = strlen(start) + 1; | |
279 | } else { | |
280 | len = end - start + 1; | |
281 | end++; | |
282 | } | |
b7a610f7 SO |
283 | if (len <= CCW_BUS_ID_SIZE) { |
284 | if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
285 | ret = -EINVAL; | |
022b660a | 286 | } else |
b7a610f7 | 287 | ret = -EINVAL; |
022b660a | 288 | |
b7a610f7 SO |
289 | if (!ret) { |
290 | id->ssid = ssid; | |
291 | id->devno = devno; | |
292 | } | |
293 | *buf = end; | |
294 | return ret; | |
022b660a UB |
295 | } |
296 | ||
b2ffd8e9 | 297 | /** |
f2962dae SO |
298 | * ccwgroup_create_dev() - create and register a ccw group device |
299 | * @parent: parent device for the new device | |
f2962dae | 300 | * @gdrv: driver for the new group device |
022b660a UB |
301 | * @num_devices: number of slave devices |
302 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 | 303 | * |
f2962dae | 304 | * Create and register a new ccw group device as a child of @parent. Slave |
b7a610f7 | 305 | * devices are obtained from the list of bus ids given in @buf. |
b2ffd8e9 CH |
306 | * Returns: |
307 | * %0 on success and an error code on failure. | |
308 | * Context: | |
309 | * non-atomic | |
1da177e4 | 310 | */ |
9814fdfb SO |
311 | int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, |
312 | int num_devices, const char *buf) | |
1da177e4 LT |
313 | { |
314 | struct ccwgroup_device *gdev; | |
b7a610f7 | 315 | struct ccw_dev_id dev_id; |
022b660a | 316 | int rc, i; |
1da177e4 | 317 | |
022b660a UB |
318 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
319 | GFP_KERNEL); | |
1da177e4 LT |
320 | if (!gdev) |
321 | return -ENOMEM; | |
322 | ||
1da177e4 | 323 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
324 | mutex_init(&gdev->reg_mutex); |
325 | mutex_lock(&gdev->reg_mutex); | |
16f7f956 PO |
326 | gdev->count = num_devices; |
327 | gdev->dev.bus = &ccwgroup_bus_type; | |
f2962dae | 328 | gdev->dev.parent = parent; |
16f7f956 PO |
329 | gdev->dev.release = ccwgroup_release; |
330 | device_initialize(&gdev->dev); | |
331 | ||
b7a610f7 SO |
332 | for (i = 0; i < num_devices && buf; i++) { |
333 | rc = __get_next_id(&buf, &dev_id); | |
022b660a UB |
334 | if (rc != 0) |
335 | goto error; | |
b7a610f7 | 336 | gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id); |
022b660a UB |
337 | /* |
338 | * All devices have to be of the same type in | |
339 | * order to be grouped. | |
340 | */ | |
b7a610f7 SO |
341 | if (!gdev->cdev[i] || !gdev->cdev[i]->drv || |
342 | gdev->cdev[i]->drv != gdev->cdev[0]->drv || | |
343 | gdev->cdev[i]->id.driver_info != | |
1da177e4 LT |
344 | gdev->cdev[0]->id.driver_info) { |
345 | rc = -EINVAL; | |
d76123eb | 346 | goto error; |
1da177e4 LT |
347 | } |
348 | /* Don't allow a device to belong to more than one group. */ | |
c560d105 | 349 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 | 350 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
c560d105 | 351 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
1da177e4 | 352 | rc = -EINVAL; |
d76123eb | 353 | goto error; |
1da177e4 | 354 | } |
db6a6423 | 355 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
c560d105 | 356 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 357 | } |
022b660a | 358 | /* Check for sufficient number of bus ids. */ |
b7a610f7 | 359 | if (i < num_devices) { |
022b660a UB |
360 | rc = -EINVAL; |
361 | goto error; | |
362 | } | |
363 | /* Check for trailing stuff. */ | |
b7a610f7 | 364 | if (i == num_devices && strlen(buf) > 0) { |
022b660a UB |
365 | rc = -EINVAL; |
366 | goto error; | |
367 | } | |
1da177e4 | 368 | |
1bf5b285 | 369 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
dbdf1afc | 370 | gdev->dev.groups = ccwgroup_attr_groups; |
f2962dae SO |
371 | |
372 | if (gdrv) { | |
373 | gdev->dev.driver = &gdrv->driver; | |
374 | rc = gdrv->setup ? gdrv->setup(gdev) : 0; | |
375 | if (rc) | |
376 | goto error; | |
377 | } | |
16f7f956 | 378 | rc = device_add(&gdev->dev); |
1da177e4 | 379 | if (rc) |
d76123eb | 380 | goto error; |
1da177e4 | 381 | rc = __ccwgroup_create_symlinks(gdev); |
dad572e3 SO |
382 | if (rc) { |
383 | device_del(&gdev->dev); | |
384 | goto error; | |
1da177e4 | 385 | } |
dad572e3 SO |
386 | mutex_unlock(&gdev->reg_mutex); |
387 | return 0; | |
1da177e4 | 388 | error: |
022b660a | 389 | for (i = 0; i < num_devices; i++) |
1da177e4 | 390 | if (gdev->cdev[i]) { |
c560d105 | 391 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 CH |
392 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
393 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
c560d105 | 394 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 395 | put_device(&gdev->cdev[i]->dev); |
f26fd5d6 | 396 | gdev->cdev[i] = NULL; |
1da177e4 | 397 | } |
d76123eb CH |
398 | mutex_unlock(&gdev->reg_mutex); |
399 | put_device(&gdev->dev); | |
1da177e4 LT |
400 | return rc; |
401 | } | |
f2962dae SO |
402 | EXPORT_SYMBOL(ccwgroup_create_dev); |
403 | ||
e909074b | 404 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
dad572e3 SO |
405 | void *data) |
406 | { | |
407 | struct device *dev = data; | |
408 | ||
409 | if (action == BUS_NOTIFY_UNBIND_DRIVER) | |
410 | device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
411 | ||
412 | return NOTIFY_OK; | |
413 | } | |
e909074b SO |
414 | |
415 | static struct notifier_block ccwgroup_nb = { | |
416 | .notifier_call = ccwgroup_notifier | |
417 | }; | |
418 | ||
419 | static int __init init_ccwgroup(void) | |
1da177e4 | 420 | { |
e909074b SO |
421 | int ret; |
422 | ||
423 | ret = bus_register(&ccwgroup_bus_type); | |
424 | if (ret) | |
425 | return ret; | |
426 | ||
427 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); | |
428 | if (ret) | |
429 | bus_unregister(&ccwgroup_bus_type); | |
430 | ||
431 | return ret; | |
1da177e4 LT |
432 | } |
433 | ||
e909074b | 434 | static void __exit cleanup_ccwgroup(void) |
1da177e4 | 435 | { |
e909074b SO |
436 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
437 | bus_unregister(&ccwgroup_bus_type); | |
1da177e4 LT |
438 | } |
439 | ||
440 | module_init(init_ccwgroup); | |
441 | module_exit(cleanup_ccwgroup); | |
442 | ||
443 | /************************** driver stuff ******************************/ | |
444 | ||
dad572e3 | 445 | static int ccwgroup_remove(struct device *dev) |
1da177e4 | 446 | { |
dad572e3 SO |
447 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
448 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
1da177e4 | 449 | |
50f15483 SO |
450 | if (!dev->driver) |
451 | return 0; | |
50f15483 | 452 | if (gdrv->remove) |
1da177e4 | 453 | gdrv->remove(gdev); |
50f15483 | 454 | |
1da177e4 LT |
455 | return 0; |
456 | } | |
457 | ||
01bc8ad1 CH |
458 | static void ccwgroup_shutdown(struct device *dev) |
459 | { | |
dad572e3 SO |
460 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
461 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
01bc8ad1 | 462 | |
50f15483 SO |
463 | if (!dev->driver) |
464 | return; | |
50f15483 | 465 | if (gdrv->shutdown) |
01bc8ad1 CH |
466 | gdrv->shutdown(gdev); |
467 | } | |
468 | ||
7e597a21 SO |
469 | static int ccwgroup_pm_prepare(struct device *dev) |
470 | { | |
471 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
472 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
473 | ||
474 | /* Fail while device is being set online/offline. */ | |
475 | if (atomic_read(&gdev->onoff)) | |
476 | return -EAGAIN; | |
477 | ||
478 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
479 | return 0; | |
480 | ||
481 | return gdrv->prepare ? gdrv->prepare(gdev) : 0; | |
482 | } | |
483 | ||
484 | static void ccwgroup_pm_complete(struct device *dev) | |
485 | { | |
486 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
487 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
488 | ||
489 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
490 | return; | |
491 | ||
492 | if (gdrv->complete) | |
493 | gdrv->complete(gdev); | |
494 | } | |
495 | ||
496 | static int ccwgroup_pm_freeze(struct device *dev) | |
497 | { | |
498 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
499 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
500 | ||
501 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
502 | return 0; | |
503 | ||
504 | return gdrv->freeze ? gdrv->freeze(gdev) : 0; | |
505 | } | |
506 | ||
507 | static int ccwgroup_pm_thaw(struct device *dev) | |
508 | { | |
509 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
510 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
511 | ||
512 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
513 | return 0; | |
514 | ||
515 | return gdrv->thaw ? gdrv->thaw(gdev) : 0; | |
516 | } | |
517 | ||
518 | static int ccwgroup_pm_restore(struct device *dev) | |
519 | { | |
520 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
521 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
522 | ||
523 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
524 | return 0; | |
525 | ||
526 | return gdrv->restore ? gdrv->restore(gdev) : 0; | |
527 | } | |
528 | ||
47145210 | 529 | static const struct dev_pm_ops ccwgroup_pm_ops = { |
7e597a21 SO |
530 | .prepare = ccwgroup_pm_prepare, |
531 | .complete = ccwgroup_pm_complete, | |
532 | .freeze = ccwgroup_pm_freeze, | |
533 | .thaw = ccwgroup_pm_thaw, | |
534 | .restore = ccwgroup_pm_restore, | |
535 | }; | |
536 | ||
f9ccf456 RK |
537 | static struct bus_type ccwgroup_bus_type = { |
538 | .name = "ccwgroup", | |
f9ccf456 | 539 | .remove = ccwgroup_remove, |
01bc8ad1 | 540 | .shutdown = ccwgroup_shutdown, |
7e597a21 | 541 | .pm = &ccwgroup_pm_ops, |
f9ccf456 RK |
542 | }; |
543 | ||
b2ffd8e9 CH |
544 | /** |
545 | * ccwgroup_driver_register() - register a ccw group driver | |
546 | * @cdriver: driver to be registered | |
547 | * | |
548 | * This function is mainly a wrapper around driver_register(). | |
549 | */ | |
550 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
551 | { |
552 | /* register our new driver with the core */ | |
292888c8 | 553 | cdriver->driver.bus = &ccwgroup_bus_type; |
1da177e4 LT |
554 | |
555 | return driver_register(&cdriver->driver); | |
556 | } | |
dad572e3 | 557 | EXPORT_SYMBOL(ccwgroup_driver_register); |
1da177e4 | 558 | |
dad572e3 | 559 | static int __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 560 | { |
887ab599 | 561 | return 1; |
1da177e4 LT |
562 | } |
563 | ||
b2ffd8e9 CH |
564 | /** |
565 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
566 | * @cdriver: driver to be deregistered | |
567 | * | |
568 | * This function is mainly a wrapper around driver_unregister(). | |
569 | */ | |
570 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 571 | { |
887ab599 CH |
572 | struct device *dev; |
573 | ||
1da177e4 | 574 | /* We don't want ccwgroup devices to live longer than their driver. */ |
887ab599 CH |
575 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
576 | __ccwgroup_match_all))) { | |
d76123eb CH |
577 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
578 | ||
579 | mutex_lock(&gdev->reg_mutex); | |
580 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 581 | device_unregister(dev); |
c0301754 | 582 | __ccwgroup_remove_cdev_refs(gdev); |
d76123eb | 583 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
584 | put_device(dev); |
585 | } | |
1da177e4 LT |
586 | driver_unregister(&cdriver->driver); |
587 | } | |
dad572e3 | 588 | EXPORT_SYMBOL(ccwgroup_driver_unregister); |
1da177e4 | 589 | |
b2ffd8e9 CH |
590 | /** |
591 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
592 | * @cdev: ccw device to be probed | |
593 | * | |
594 | * This is a dummy probe function for ccw devices that are slave devices in | |
595 | * a ccw group device. | |
596 | * Returns: | |
597 | * always %0 | |
598 | */ | |
599 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
600 | { |
601 | return 0; | |
602 | } | |
dad572e3 | 603 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
1da177e4 | 604 | |
b2ffd8e9 CH |
605 | /** |
606 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
607 | * @cdev: ccw device to be removed | |
608 | * | |
609 | * This is a remove function for ccw devices that are slave devices in a ccw | |
610 | * group device. It sets the ccw device offline and also deregisters the | |
611 | * embedding ccw group device. | |
612 | */ | |
613 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
614 | { |
615 | struct ccwgroup_device *gdev; | |
616 | ||
617 | /* Ignore offlining errors, device is gone anyway. */ | |
618 | ccw_device_set_offline(cdev); | |
619 | /* If one of its devices is gone, the whole group is done for. */ | |
c0301754 PO |
620 | spin_lock_irq(cdev->ccwlock); |
621 | gdev = dev_get_drvdata(&cdev->dev); | |
622 | if (!gdev) { | |
623 | spin_unlock_irq(cdev->ccwlock); | |
624 | return; | |
625 | } | |
626 | /* Get ccwgroup device reference for local processing. */ | |
627 | get_device(&gdev->dev); | |
628 | spin_unlock_irq(cdev->ccwlock); | |
629 | /* Unregister group device. */ | |
630 | mutex_lock(&gdev->reg_mutex); | |
631 | if (device_is_registered(&gdev->dev)) { | |
1da177e4 LT |
632 | __ccwgroup_remove_symlinks(gdev); |
633 | device_unregister(&gdev->dev); | |
c0301754 | 634 | __ccwgroup_remove_cdev_refs(gdev); |
1da177e4 | 635 | } |
c0301754 PO |
636 | mutex_unlock(&gdev->reg_mutex); |
637 | /* Release ccwgroup device reference for local processing. */ | |
638 | put_device(&gdev->dev); | |
1da177e4 | 639 | } |
1da177e4 | 640 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |
dad572e3 | 641 | MODULE_LICENSE("GPL"); |