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); | |
dad572e3 SO |
131 | unsigned long value; |
132 | int ret; | |
133 | ||
d5b877ff SO |
134 | device_lock(dev); |
135 | if (!dev->driver) { | |
136 | ret = -EINVAL; | |
137 | goto out; | |
138 | } | |
dad572e3 | 139 | |
0178722b | 140 | ret = kstrtoul(buf, 0, &value); |
dad572e3 SO |
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: | |
d5b877ff | 151 | device_unlock(dev); |
dad572e3 SO |
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 | */ | |
0b60f9ea | 171 | static void ccwgroup_ungroup(struct ccwgroup_device *gdev) |
d9a9cdfb | 172 | { |
d76123eb | 173 | mutex_lock(&gdev->reg_mutex); |
1a908c73 CH |
174 | if (device_is_registered(&gdev->dev)) { |
175 | __ccwgroup_remove_symlinks(gdev); | |
0b60f9ea | 176 | device_unregister(&gdev->dev); |
c0301754 | 177 | __ccwgroup_remove_cdev_refs(gdev); |
1a908c73 | 178 | } |
d76123eb | 179 | mutex_unlock(&gdev->reg_mutex); |
d9a9cdfb AS |
180 | } |
181 | ||
dad572e3 SO |
182 | static ssize_t ccwgroup_ungroup_store(struct device *dev, |
183 | struct device_attribute *attr, | |
184 | const char *buf, size_t count) | |
1da177e4 | 185 | { |
dad572e3 | 186 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
d9a9cdfb | 187 | int rc; |
1da177e4 | 188 | |
c619d422 PO |
189 | /* Prevent concurrent online/offline processing and ungrouping. */ |
190 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) | |
191 | return -EAGAIN; | |
192 | if (gdev->state != CCWGROUP_OFFLINE) { | |
193 | rc = -EINVAL; | |
194 | goto out; | |
195 | } | |
0b60f9ea TH |
196 | |
197 | if (device_remove_file_self(dev, attr)) | |
198 | ccwgroup_ungroup(gdev); | |
c619d422 PO |
199 | out: |
200 | if (rc) { | |
66942064 AC |
201 | if (rc != -EAGAIN) |
202 | /* Release onoff "lock" when ungrouping failed. */ | |
203 | atomic_set(&gdev->onoff, 0); | |
c619d422 PO |
204 | return rc; |
205 | } | |
1da177e4 LT |
206 | return count; |
207 | } | |
1da177e4 | 208 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); |
dbdf1afc SO |
209 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); |
210 | ||
211 | static struct attribute *ccwgroup_attrs[] = { | |
212 | &dev_attr_online.attr, | |
213 | &dev_attr_ungroup.attr, | |
214 | NULL, | |
215 | }; | |
216 | static struct attribute_group ccwgroup_attr_group = { | |
217 | .attrs = ccwgroup_attrs, | |
218 | }; | |
219 | static const struct attribute_group *ccwgroup_attr_groups[] = { | |
220 | &ccwgroup_attr_group, | |
221 | NULL, | |
222 | }; | |
1da177e4 | 223 | |
0b60f9ea TH |
224 | static void ccwgroup_ungroup_workfn(struct work_struct *work) |
225 | { | |
226 | struct ccwgroup_device *gdev = | |
227 | container_of(work, struct ccwgroup_device, ungroup_work); | |
228 | ||
229 | ccwgroup_ungroup(gdev); | |
230 | } | |
231 | ||
dad572e3 | 232 | static void ccwgroup_release(struct device *dev) |
1da177e4 | 233 | { |
c0301754 | 234 | kfree(to_ccwgroupdev(dev)); |
1da177e4 LT |
235 | } |
236 | ||
dad572e3 | 237 | static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
1da177e4 LT |
238 | { |
239 | char str[8]; | |
240 | int i, rc; | |
241 | ||
242 | for (i = 0; i < gdev->count; i++) { | |
dad572e3 SO |
243 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, |
244 | &gdev->dev.kobj, "group_device"); | |
1da177e4 LT |
245 | if (rc) { |
246 | for (--i; i >= 0; i--) | |
247 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
248 | "group_device"); | |
249 | return rc; | |
250 | } | |
251 | } | |
252 | for (i = 0; i < gdev->count; i++) { | |
253 | sprintf(str, "cdev%d", i); | |
dad572e3 SO |
254 | rc = sysfs_create_link(&gdev->dev.kobj, |
255 | &gdev->cdev[i]->dev.kobj, str); | |
1da177e4 LT |
256 | if (rc) { |
257 | for (--i; i >= 0; i--) { | |
258 | sprintf(str, "cdev%d", i); | |
259 | sysfs_remove_link(&gdev->dev.kobj, str); | |
260 | } | |
261 | for (i = 0; i < gdev->count; i++) | |
262 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
263 | "group_device"); | |
264 | return rc; | |
265 | } | |
266 | } | |
267 | return 0; | |
268 | } | |
269 | ||
b7a610f7 | 270 | static int __get_next_id(const char **buf, struct ccw_dev_id *id) |
022b660a | 271 | { |
b7a610f7 SO |
272 | unsigned int cssid, ssid, devno; |
273 | int ret = 0, len; | |
022b660a UB |
274 | char *start, *end; |
275 | ||
276 | start = (char *)*buf; | |
277 | end = strchr(start, ','); | |
278 | if (!end) { | |
279 | /* Last entry. Strip trailing newline, if applicable. */ | |
280 | end = strchr(start, '\n'); | |
281 | if (end) | |
282 | *end = '\0'; | |
283 | len = strlen(start) + 1; | |
284 | } else { | |
285 | len = end - start + 1; | |
286 | end++; | |
287 | } | |
b7a610f7 SO |
288 | if (len <= CCW_BUS_ID_SIZE) { |
289 | if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
290 | ret = -EINVAL; | |
022b660a | 291 | } else |
b7a610f7 | 292 | ret = -EINVAL; |
022b660a | 293 | |
b7a610f7 SO |
294 | if (!ret) { |
295 | id->ssid = ssid; | |
296 | id->devno = devno; | |
297 | } | |
298 | *buf = end; | |
299 | return ret; | |
022b660a UB |
300 | } |
301 | ||
b2ffd8e9 | 302 | /** |
f2962dae SO |
303 | * ccwgroup_create_dev() - create and register a ccw group device |
304 | * @parent: parent device for the new device | |
f2962dae | 305 | * @gdrv: driver for the new group device |
022b660a UB |
306 | * @num_devices: number of slave devices |
307 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 | 308 | * |
f2962dae | 309 | * Create and register a new ccw group device as a child of @parent. Slave |
b7a610f7 | 310 | * devices are obtained from the list of bus ids given in @buf. |
b2ffd8e9 CH |
311 | * Returns: |
312 | * %0 on success and an error code on failure. | |
313 | * Context: | |
314 | * non-atomic | |
1da177e4 | 315 | */ |
9814fdfb SO |
316 | int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, |
317 | int num_devices, const char *buf) | |
1da177e4 LT |
318 | { |
319 | struct ccwgroup_device *gdev; | |
b7a610f7 | 320 | struct ccw_dev_id dev_id; |
022b660a | 321 | int rc, i; |
1da177e4 | 322 | |
022b660a UB |
323 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
324 | GFP_KERNEL); | |
1da177e4 LT |
325 | if (!gdev) |
326 | return -ENOMEM; | |
327 | ||
1da177e4 | 328 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
329 | mutex_init(&gdev->reg_mutex); |
330 | mutex_lock(&gdev->reg_mutex); | |
0b60f9ea | 331 | INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn); |
16f7f956 PO |
332 | gdev->count = num_devices; |
333 | gdev->dev.bus = &ccwgroup_bus_type; | |
f2962dae | 334 | gdev->dev.parent = parent; |
16f7f956 PO |
335 | gdev->dev.release = ccwgroup_release; |
336 | device_initialize(&gdev->dev); | |
337 | ||
b7a610f7 SO |
338 | for (i = 0; i < num_devices && buf; i++) { |
339 | rc = __get_next_id(&buf, &dev_id); | |
022b660a UB |
340 | if (rc != 0) |
341 | goto error; | |
b7a610f7 | 342 | gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id); |
022b660a UB |
343 | /* |
344 | * All devices have to be of the same type in | |
345 | * order to be grouped. | |
346 | */ | |
b7a610f7 SO |
347 | if (!gdev->cdev[i] || !gdev->cdev[i]->drv || |
348 | gdev->cdev[i]->drv != gdev->cdev[0]->drv || | |
349 | gdev->cdev[i]->id.driver_info != | |
1da177e4 LT |
350 | gdev->cdev[0]->id.driver_info) { |
351 | rc = -EINVAL; | |
d76123eb | 352 | goto error; |
1da177e4 LT |
353 | } |
354 | /* Don't allow a device to belong to more than one group. */ | |
c560d105 | 355 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 | 356 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
c560d105 | 357 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
1da177e4 | 358 | rc = -EINVAL; |
d76123eb | 359 | goto error; |
1da177e4 | 360 | } |
db6a6423 | 361 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
c560d105 | 362 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 363 | } |
022b660a | 364 | /* Check for sufficient number of bus ids. */ |
b7a610f7 | 365 | if (i < num_devices) { |
022b660a UB |
366 | rc = -EINVAL; |
367 | goto error; | |
368 | } | |
369 | /* Check for trailing stuff. */ | |
b7a610f7 | 370 | if (i == num_devices && strlen(buf) > 0) { |
022b660a UB |
371 | rc = -EINVAL; |
372 | goto error; | |
373 | } | |
1da177e4 | 374 | |
1bf5b285 | 375 | dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev)); |
dbdf1afc | 376 | gdev->dev.groups = ccwgroup_attr_groups; |
f2962dae SO |
377 | |
378 | if (gdrv) { | |
379 | gdev->dev.driver = &gdrv->driver; | |
380 | rc = gdrv->setup ? gdrv->setup(gdev) : 0; | |
381 | if (rc) | |
382 | goto error; | |
383 | } | |
16f7f956 | 384 | rc = device_add(&gdev->dev); |
1da177e4 | 385 | if (rc) |
d76123eb | 386 | goto error; |
1da177e4 | 387 | rc = __ccwgroup_create_symlinks(gdev); |
dad572e3 SO |
388 | if (rc) { |
389 | device_del(&gdev->dev); | |
390 | goto error; | |
1da177e4 | 391 | } |
dad572e3 SO |
392 | mutex_unlock(&gdev->reg_mutex); |
393 | return 0; | |
1da177e4 | 394 | error: |
022b660a | 395 | for (i = 0; i < num_devices; i++) |
1da177e4 | 396 | if (gdev->cdev[i]) { |
c560d105 | 397 | spin_lock_irq(gdev->cdev[i]->ccwlock); |
db6a6423 CH |
398 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
399 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
c560d105 | 400 | spin_unlock_irq(gdev->cdev[i]->ccwlock); |
17088229 | 401 | put_device(&gdev->cdev[i]->dev); |
f26fd5d6 | 402 | gdev->cdev[i] = NULL; |
1da177e4 | 403 | } |
d76123eb CH |
404 | mutex_unlock(&gdev->reg_mutex); |
405 | put_device(&gdev->dev); | |
1da177e4 LT |
406 | return rc; |
407 | } | |
f2962dae SO |
408 | EXPORT_SYMBOL(ccwgroup_create_dev); |
409 | ||
e909074b | 410 | static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, |
dad572e3 SO |
411 | void *data) |
412 | { | |
0b60f9ea | 413 | struct ccwgroup_device *gdev = to_ccwgroupdev(data); |
dad572e3 SO |
414 | |
415 | if (action == BUS_NOTIFY_UNBIND_DRIVER) | |
0b60f9ea | 416 | schedule_work(&gdev->ungroup_work); |
dad572e3 SO |
417 | |
418 | return NOTIFY_OK; | |
419 | } | |
e909074b SO |
420 | |
421 | static struct notifier_block ccwgroup_nb = { | |
422 | .notifier_call = ccwgroup_notifier | |
423 | }; | |
424 | ||
425 | static int __init init_ccwgroup(void) | |
1da177e4 | 426 | { |
e909074b SO |
427 | int ret; |
428 | ||
429 | ret = bus_register(&ccwgroup_bus_type); | |
430 | if (ret) | |
431 | return ret; | |
432 | ||
433 | ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb); | |
434 | if (ret) | |
435 | bus_unregister(&ccwgroup_bus_type); | |
436 | ||
437 | return ret; | |
1da177e4 LT |
438 | } |
439 | ||
e909074b | 440 | static void __exit cleanup_ccwgroup(void) |
1da177e4 | 441 | { |
e909074b SO |
442 | bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb); |
443 | bus_unregister(&ccwgroup_bus_type); | |
1da177e4 LT |
444 | } |
445 | ||
446 | module_init(init_ccwgroup); | |
447 | module_exit(cleanup_ccwgroup); | |
448 | ||
449 | /************************** driver stuff ******************************/ | |
450 | ||
dad572e3 | 451 | static int ccwgroup_remove(struct device *dev) |
1da177e4 | 452 | { |
dad572e3 SO |
453 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
454 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
1da177e4 | 455 | |
50f15483 SO |
456 | if (!dev->driver) |
457 | return 0; | |
50f15483 | 458 | if (gdrv->remove) |
1da177e4 | 459 | gdrv->remove(gdev); |
50f15483 | 460 | |
1da177e4 LT |
461 | return 0; |
462 | } | |
463 | ||
01bc8ad1 CH |
464 | static void ccwgroup_shutdown(struct device *dev) |
465 | { | |
dad572e3 SO |
466 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
467 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
01bc8ad1 | 468 | |
50f15483 SO |
469 | if (!dev->driver) |
470 | return; | |
50f15483 | 471 | if (gdrv->shutdown) |
01bc8ad1 CH |
472 | gdrv->shutdown(gdev); |
473 | } | |
474 | ||
7e597a21 SO |
475 | static int ccwgroup_pm_prepare(struct device *dev) |
476 | { | |
477 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
478 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
479 | ||
480 | /* Fail while device is being set online/offline. */ | |
481 | if (atomic_read(&gdev->onoff)) | |
482 | return -EAGAIN; | |
483 | ||
484 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
485 | return 0; | |
486 | ||
487 | return gdrv->prepare ? gdrv->prepare(gdev) : 0; | |
488 | } | |
489 | ||
490 | static void ccwgroup_pm_complete(struct device *dev) | |
491 | { | |
492 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
493 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); | |
494 | ||
495 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
496 | return; | |
497 | ||
498 | if (gdrv->complete) | |
499 | gdrv->complete(gdev); | |
500 | } | |
501 | ||
502 | static int ccwgroup_pm_freeze(struct device *dev) | |
503 | { | |
504 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
505 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
506 | ||
507 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
508 | return 0; | |
509 | ||
510 | return gdrv->freeze ? gdrv->freeze(gdev) : 0; | |
511 | } | |
512 | ||
513 | static int ccwgroup_pm_thaw(struct device *dev) | |
514 | { | |
515 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
516 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
517 | ||
518 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
519 | return 0; | |
520 | ||
521 | return gdrv->thaw ? gdrv->thaw(gdev) : 0; | |
522 | } | |
523 | ||
524 | static int ccwgroup_pm_restore(struct device *dev) | |
525 | { | |
526 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
527 | struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver); | |
528 | ||
529 | if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE) | |
530 | return 0; | |
531 | ||
532 | return gdrv->restore ? gdrv->restore(gdev) : 0; | |
533 | } | |
534 | ||
47145210 | 535 | static const struct dev_pm_ops ccwgroup_pm_ops = { |
7e597a21 SO |
536 | .prepare = ccwgroup_pm_prepare, |
537 | .complete = ccwgroup_pm_complete, | |
538 | .freeze = ccwgroup_pm_freeze, | |
539 | .thaw = ccwgroup_pm_thaw, | |
540 | .restore = ccwgroup_pm_restore, | |
541 | }; | |
542 | ||
f9ccf456 RK |
543 | static struct bus_type ccwgroup_bus_type = { |
544 | .name = "ccwgroup", | |
f9ccf456 | 545 | .remove = ccwgroup_remove, |
01bc8ad1 | 546 | .shutdown = ccwgroup_shutdown, |
7e597a21 | 547 | .pm = &ccwgroup_pm_ops, |
f9ccf456 RK |
548 | }; |
549 | ||
b2ffd8e9 CH |
550 | /** |
551 | * ccwgroup_driver_register() - register a ccw group driver | |
552 | * @cdriver: driver to be registered | |
553 | * | |
554 | * This function is mainly a wrapper around driver_register(). | |
555 | */ | |
556 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
557 | { |
558 | /* register our new driver with the core */ | |
292888c8 | 559 | cdriver->driver.bus = &ccwgroup_bus_type; |
1da177e4 LT |
560 | |
561 | return driver_register(&cdriver->driver); | |
562 | } | |
dad572e3 | 563 | EXPORT_SYMBOL(ccwgroup_driver_register); |
1da177e4 | 564 | |
dad572e3 | 565 | static int __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 566 | { |
887ab599 | 567 | return 1; |
1da177e4 LT |
568 | } |
569 | ||
b2ffd8e9 CH |
570 | /** |
571 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
572 | * @cdriver: driver to be deregistered | |
573 | * | |
574 | * This function is mainly a wrapper around driver_unregister(). | |
575 | */ | |
576 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 577 | { |
887ab599 CH |
578 | struct device *dev; |
579 | ||
1da177e4 | 580 | /* We don't want ccwgroup devices to live longer than their driver. */ |
887ab599 CH |
581 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
582 | __ccwgroup_match_all))) { | |
d76123eb CH |
583 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
584 | ||
585 | mutex_lock(&gdev->reg_mutex); | |
586 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 587 | device_unregister(dev); |
c0301754 | 588 | __ccwgroup_remove_cdev_refs(gdev); |
d76123eb | 589 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
590 | put_device(dev); |
591 | } | |
1da177e4 LT |
592 | driver_unregister(&cdriver->driver); |
593 | } | |
dad572e3 | 594 | EXPORT_SYMBOL(ccwgroup_driver_unregister); |
1da177e4 | 595 | |
b2ffd8e9 CH |
596 | /** |
597 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
598 | * @cdev: ccw device to be probed | |
599 | * | |
600 | * This is a dummy probe function for ccw devices that are slave devices in | |
601 | * a ccw group device. | |
602 | * Returns: | |
603 | * always %0 | |
604 | */ | |
605 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
606 | { |
607 | return 0; | |
608 | } | |
dad572e3 | 609 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
1da177e4 | 610 | |
b2ffd8e9 CH |
611 | /** |
612 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
613 | * @cdev: ccw device to be removed | |
614 | * | |
615 | * This is a remove function for ccw devices that are slave devices in a ccw | |
616 | * group device. It sets the ccw device offline and also deregisters the | |
617 | * embedding ccw group device. | |
618 | */ | |
619 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
620 | { |
621 | struct ccwgroup_device *gdev; | |
622 | ||
623 | /* Ignore offlining errors, device is gone anyway. */ | |
624 | ccw_device_set_offline(cdev); | |
625 | /* If one of its devices is gone, the whole group is done for. */ | |
c0301754 PO |
626 | spin_lock_irq(cdev->ccwlock); |
627 | gdev = dev_get_drvdata(&cdev->dev); | |
628 | if (!gdev) { | |
629 | spin_unlock_irq(cdev->ccwlock); | |
630 | return; | |
631 | } | |
632 | /* Get ccwgroup device reference for local processing. */ | |
633 | get_device(&gdev->dev); | |
634 | spin_unlock_irq(cdev->ccwlock); | |
635 | /* Unregister group device. */ | |
636 | mutex_lock(&gdev->reg_mutex); | |
637 | if (device_is_registered(&gdev->dev)) { | |
1da177e4 LT |
638 | __ccwgroup_remove_symlinks(gdev); |
639 | device_unregister(&gdev->dev); | |
c0301754 | 640 | __ccwgroup_remove_cdev_refs(gdev); |
1da177e4 | 641 | } |
c0301754 PO |
642 | mutex_unlock(&gdev->reg_mutex); |
643 | /* Release ccwgroup device reference for local processing. */ | |
644 | put_device(&gdev->dev); | |
1da177e4 | 645 | } |
1da177e4 | 646 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |
dad572e3 | 647 | MODULE_LICENSE("GPL"); |