1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Copyright (c) 2021, Linaro Ltd <loic.poulain@linaro.org> */ |
3 | |
4 | #include <linux/bitmap.h> |
5 | #include <linux/err.h> |
6 | #include <linux/errno.h> |
7 | #include <linux/debugfs.h> |
8 | #include <linux/fs.h> |
9 | #include <linux/init.h> |
10 | #include <linux/idr.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> |
13 | #include <linux/poll.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/types.h> |
17 | #include <linux/uaccess.h> |
18 | #include <linux/termios.h> |
19 | #include <linux/wwan.h> |
20 | #include <net/rtnetlink.h> |
21 | #include <uapi/linux/wwan.h> |
22 | |
23 | /* Maximum number of minors in use */ |
24 | #define WWAN_MAX_MINORS (1 << MINORBITS) |
25 | |
26 | static DEFINE_MUTEX(wwan_register_lock); /* WWAN device create|remove lock */ |
27 | static DEFINE_IDA(minors); /* minors for WWAN port chardevs */ |
28 | static DEFINE_IDA(wwan_dev_ids); /* for unique WWAN device IDs */ |
29 | static struct class *wwan_class; |
30 | static int wwan_major; |
31 | static struct dentry *wwan_debugfs_dir; |
32 | |
33 | #define to_wwan_dev(d) container_of(d, struct wwan_device, dev) |
34 | #define to_wwan_port(d) container_of(d, struct wwan_port, dev) |
35 | |
36 | /* WWAN port flags */ |
37 | #define WWAN_PORT_TX_OFF 0 |
38 | |
39 | /** |
40 | * struct wwan_device - The structure that defines a WWAN device |
41 | * |
42 | * @id: WWAN device unique ID. |
43 | * @dev: Underlying device. |
44 | * @port_id: Current available port ID to pick. |
45 | * @ops: wwan device ops |
46 | * @ops_ctxt: context to pass to ops |
47 | * @debugfs_dir: WWAN device debugfs dir |
48 | */ |
49 | struct wwan_device { |
50 | unsigned int id; |
51 | struct device dev; |
52 | atomic_t port_id; |
53 | const struct wwan_ops *ops; |
54 | void *ops_ctxt; |
55 | #ifdef CONFIG_WWAN_DEBUGFS |
56 | struct dentry *debugfs_dir; |
57 | #endif |
58 | }; |
59 | |
60 | /** |
61 | * struct wwan_port - The structure that defines a WWAN port |
62 | * @type: Port type |
63 | * @start_count: Port start counter |
64 | * @flags: Store port state and capabilities |
65 | * @ops: Pointer to WWAN port operations |
66 | * @ops_lock: Protect port ops |
67 | * @dev: Underlying device |
68 | * @rxq: Buffer inbound queue |
69 | * @waitqueue: The waitqueue for port fops (read/write/poll) |
70 | * @data_lock: Port specific data access serialization |
71 | * @headroom_len: SKB reserved headroom size |
72 | * @frag_len: Length to fragment packet |
73 | * @at_data: AT port specific data |
74 | */ |
75 | struct wwan_port { |
76 | enum wwan_port_type type; |
77 | unsigned int start_count; |
78 | unsigned long flags; |
79 | const struct wwan_port_ops *ops; |
80 | struct mutex ops_lock; /* Serialize ops + protect against removal */ |
81 | struct device dev; |
82 | struct sk_buff_head rxq; |
83 | wait_queue_head_t waitqueue; |
84 | struct mutex data_lock; /* Port specific data access serialization */ |
85 | size_t headroom_len; |
86 | size_t frag_len; |
87 | union { |
88 | struct { |
89 | struct ktermios termios; |
90 | int mdmbits; |
91 | } at_data; |
92 | }; |
93 | }; |
94 | |
95 | static ssize_t index_show(struct device *dev, struct device_attribute *attr, char *buf) |
96 | { |
97 | struct wwan_device *wwan = to_wwan_dev(dev); |
98 | |
99 | return sprintf(buf, fmt: "%d\n" , wwan->id); |
100 | } |
101 | static DEVICE_ATTR_RO(index); |
102 | |
103 | static struct attribute *wwan_dev_attrs[] = { |
104 | &dev_attr_index.attr, |
105 | NULL, |
106 | }; |
107 | ATTRIBUTE_GROUPS(wwan_dev); |
108 | |
109 | static void wwan_dev_destroy(struct device *dev) |
110 | { |
111 | struct wwan_device *wwandev = to_wwan_dev(dev); |
112 | |
113 | ida_free(&wwan_dev_ids, id: wwandev->id); |
114 | kfree(objp: wwandev); |
115 | } |
116 | |
117 | static const struct device_type wwan_dev_type = { |
118 | .name = "wwan_dev" , |
119 | .release = wwan_dev_destroy, |
120 | .groups = wwan_dev_groups, |
121 | }; |
122 | |
123 | static int wwan_dev_parent_match(struct device *dev, const void *parent) |
124 | { |
125 | return (dev->type == &wwan_dev_type && |
126 | (dev->parent == parent || dev == parent)); |
127 | } |
128 | |
129 | static struct wwan_device *wwan_dev_get_by_parent(struct device *parent) |
130 | { |
131 | struct device *dev; |
132 | |
133 | dev = class_find_device(class: wwan_class, NULL, data: parent, match: wwan_dev_parent_match); |
134 | if (!dev) |
135 | return ERR_PTR(error: -ENODEV); |
136 | |
137 | return to_wwan_dev(dev); |
138 | } |
139 | |
140 | static int wwan_dev_name_match(struct device *dev, const void *name) |
141 | { |
142 | return dev->type == &wwan_dev_type && |
143 | strcmp(dev_name(dev), name) == 0; |
144 | } |
145 | |
146 | static struct wwan_device *wwan_dev_get_by_name(const char *name) |
147 | { |
148 | struct device *dev; |
149 | |
150 | dev = class_find_device(class: wwan_class, NULL, data: name, match: wwan_dev_name_match); |
151 | if (!dev) |
152 | return ERR_PTR(error: -ENODEV); |
153 | |
154 | return to_wwan_dev(dev); |
155 | } |
156 | |
157 | #ifdef CONFIG_WWAN_DEBUGFS |
158 | struct dentry *wwan_get_debugfs_dir(struct device *parent) |
159 | { |
160 | struct wwan_device *wwandev; |
161 | |
162 | wwandev = wwan_dev_get_by_parent(parent); |
163 | if (IS_ERR(ptr: wwandev)) |
164 | return ERR_CAST(ptr: wwandev); |
165 | |
166 | return wwandev->debugfs_dir; |
167 | } |
168 | EXPORT_SYMBOL_GPL(wwan_get_debugfs_dir); |
169 | |
170 | static int wwan_dev_debugfs_match(struct device *dev, const void *dir) |
171 | { |
172 | struct wwan_device *wwandev; |
173 | |
174 | if (dev->type != &wwan_dev_type) |
175 | return 0; |
176 | |
177 | wwandev = to_wwan_dev(dev); |
178 | |
179 | return wwandev->debugfs_dir == dir; |
180 | } |
181 | |
182 | static struct wwan_device *wwan_dev_get_by_debugfs(struct dentry *dir) |
183 | { |
184 | struct device *dev; |
185 | |
186 | dev = class_find_device(class: wwan_class, NULL, data: dir, match: wwan_dev_debugfs_match); |
187 | if (!dev) |
188 | return ERR_PTR(error: -ENODEV); |
189 | |
190 | return to_wwan_dev(dev); |
191 | } |
192 | |
193 | void wwan_put_debugfs_dir(struct dentry *dir) |
194 | { |
195 | struct wwan_device *wwandev = wwan_dev_get_by_debugfs(dir); |
196 | |
197 | if (WARN_ON(IS_ERR(wwandev))) |
198 | return; |
199 | |
200 | /* wwan_dev_get_by_debugfs() also got a reference */ |
201 | put_device(dev: &wwandev->dev); |
202 | put_device(dev: &wwandev->dev); |
203 | } |
204 | EXPORT_SYMBOL_GPL(wwan_put_debugfs_dir); |
205 | #endif |
206 | |
207 | /* This function allocates and registers a new WWAN device OR if a WWAN device |
208 | * already exist for the given parent, it gets a reference and return it. |
209 | * This function is not exported (for now), it is called indirectly via |
210 | * wwan_create_port(). |
211 | */ |
212 | static struct wwan_device *wwan_create_dev(struct device *parent) |
213 | { |
214 | struct wwan_device *wwandev; |
215 | int err, id; |
216 | |
217 | /* The 'find-alloc-register' operation must be protected against |
218 | * concurrent execution, a WWAN device is possibly shared between |
219 | * multiple callers or concurrently unregistered from wwan_remove_dev(). |
220 | */ |
221 | mutex_lock(&wwan_register_lock); |
222 | |
223 | /* If wwandev already exists, return it */ |
224 | wwandev = wwan_dev_get_by_parent(parent); |
225 | if (!IS_ERR(ptr: wwandev)) |
226 | goto done_unlock; |
227 | |
228 | id = ida_alloc(ida: &wwan_dev_ids, GFP_KERNEL); |
229 | if (id < 0) { |
230 | wwandev = ERR_PTR(error: id); |
231 | goto done_unlock; |
232 | } |
233 | |
234 | wwandev = kzalloc(size: sizeof(*wwandev), GFP_KERNEL); |
235 | if (!wwandev) { |
236 | wwandev = ERR_PTR(error: -ENOMEM); |
237 | ida_free(&wwan_dev_ids, id); |
238 | goto done_unlock; |
239 | } |
240 | |
241 | wwandev->dev.parent = parent; |
242 | wwandev->dev.class = wwan_class; |
243 | wwandev->dev.type = &wwan_dev_type; |
244 | wwandev->id = id; |
245 | dev_set_name(dev: &wwandev->dev, name: "wwan%d" , wwandev->id); |
246 | |
247 | err = device_register(dev: &wwandev->dev); |
248 | if (err) { |
249 | put_device(dev: &wwandev->dev); |
250 | wwandev = ERR_PTR(error: err); |
251 | goto done_unlock; |
252 | } |
253 | |
254 | #ifdef CONFIG_WWAN_DEBUGFS |
255 | wwandev->debugfs_dir = |
256 | debugfs_create_dir(name: kobject_name(kobj: &wwandev->dev.kobj), |
257 | parent: wwan_debugfs_dir); |
258 | #endif |
259 | |
260 | done_unlock: |
261 | mutex_unlock(lock: &wwan_register_lock); |
262 | |
263 | return wwandev; |
264 | } |
265 | |
266 | static int is_wwan_child(struct device *dev, void *data) |
267 | { |
268 | return dev->class == wwan_class; |
269 | } |
270 | |
271 | static void wwan_remove_dev(struct wwan_device *wwandev) |
272 | { |
273 | int ret; |
274 | |
275 | /* Prevent concurrent picking from wwan_create_dev */ |
276 | mutex_lock(&wwan_register_lock); |
277 | |
278 | /* WWAN device is created and registered (get+add) along with its first |
279 | * child port, and subsequent port registrations only grab a reference |
280 | * (get). The WWAN device must then be unregistered (del+put) along with |
281 | * its last port, and reference simply dropped (put) otherwise. In the |
282 | * same fashion, we must not unregister it when the ops are still there. |
283 | */ |
284 | if (wwandev->ops) |
285 | ret = 1; |
286 | else |
287 | ret = device_for_each_child(dev: &wwandev->dev, NULL, fn: is_wwan_child); |
288 | |
289 | if (!ret) { |
290 | #ifdef CONFIG_WWAN_DEBUGFS |
291 | debugfs_remove_recursive(dentry: wwandev->debugfs_dir); |
292 | #endif |
293 | device_unregister(dev: &wwandev->dev); |
294 | } else { |
295 | put_device(dev: &wwandev->dev); |
296 | } |
297 | |
298 | mutex_unlock(lock: &wwan_register_lock); |
299 | } |
300 | |
301 | /* ------- WWAN port management ------- */ |
302 | |
303 | static const struct { |
304 | const char * const name; /* Port type name */ |
305 | const char * const devsuf; /* Port device name suffix */ |
306 | } wwan_port_types[WWAN_PORT_MAX + 1] = { |
307 | [WWAN_PORT_AT] = { |
308 | .name = "AT" , |
309 | .devsuf = "at" , |
310 | }, |
311 | [WWAN_PORT_MBIM] = { |
312 | .name = "MBIM" , |
313 | .devsuf = "mbim" , |
314 | }, |
315 | [WWAN_PORT_QMI] = { |
316 | .name = "QMI" , |
317 | .devsuf = "qmi" , |
318 | }, |
319 | [WWAN_PORT_QCDM] = { |
320 | .name = "QCDM" , |
321 | .devsuf = "qcdm" , |
322 | }, |
323 | [WWAN_PORT_FIREHOSE] = { |
324 | .name = "FIREHOSE" , |
325 | .devsuf = "firehose" , |
326 | }, |
327 | [WWAN_PORT_XMMRPC] = { |
328 | .name = "XMMRPC" , |
329 | .devsuf = "xmmrpc" , |
330 | }, |
331 | }; |
332 | |
333 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
334 | char *buf) |
335 | { |
336 | struct wwan_port *port = to_wwan_port(dev); |
337 | |
338 | return sprintf(buf, fmt: "%s\n" , wwan_port_types[port->type].name); |
339 | } |
340 | static DEVICE_ATTR_RO(type); |
341 | |
342 | static struct attribute *wwan_port_attrs[] = { |
343 | &dev_attr_type.attr, |
344 | NULL, |
345 | }; |
346 | ATTRIBUTE_GROUPS(wwan_port); |
347 | |
348 | static void wwan_port_destroy(struct device *dev) |
349 | { |
350 | struct wwan_port *port = to_wwan_port(dev); |
351 | |
352 | ida_free(&minors, MINOR(port->dev.devt)); |
353 | mutex_destroy(lock: &port->data_lock); |
354 | mutex_destroy(lock: &port->ops_lock); |
355 | kfree(objp: port); |
356 | } |
357 | |
358 | static const struct device_type wwan_port_dev_type = { |
359 | .name = "wwan_port" , |
360 | .release = wwan_port_destroy, |
361 | .groups = wwan_port_groups, |
362 | }; |
363 | |
364 | static int wwan_port_minor_match(struct device *dev, const void *minor) |
365 | { |
366 | return (dev->type == &wwan_port_dev_type && |
367 | MINOR(dev->devt) == *(unsigned int *)minor); |
368 | } |
369 | |
370 | static struct wwan_port *wwan_port_get_by_minor(unsigned int minor) |
371 | { |
372 | struct device *dev; |
373 | |
374 | dev = class_find_device(class: wwan_class, NULL, data: &minor, match: wwan_port_minor_match); |
375 | if (!dev) |
376 | return ERR_PTR(error: -ENODEV); |
377 | |
378 | return to_wwan_port(dev); |
379 | } |
380 | |
381 | /* Allocate and set unique name based on passed format |
382 | * |
383 | * Name allocation approach is highly inspired by the __dev_alloc_name() |
384 | * function. |
385 | * |
386 | * To avoid names collision, the caller must prevent the new port device |
387 | * registration as well as concurrent invocation of this function. |
388 | */ |
389 | static int __wwan_port_dev_assign_name(struct wwan_port *port, const char *fmt) |
390 | { |
391 | struct wwan_device *wwandev = to_wwan_dev(port->dev.parent); |
392 | const unsigned int max_ports = PAGE_SIZE * 8; |
393 | struct class_dev_iter iter; |
394 | unsigned long *idmap; |
395 | struct device *dev; |
396 | char buf[0x20]; |
397 | int id; |
398 | |
399 | idmap = bitmap_zalloc(nbits: max_ports, GFP_KERNEL); |
400 | if (!idmap) |
401 | return -ENOMEM; |
402 | |
403 | /* Collect ids of same name format ports */ |
404 | class_dev_iter_init(iter: &iter, class: wwan_class, NULL, type: &wwan_port_dev_type); |
405 | while ((dev = class_dev_iter_next(iter: &iter))) { |
406 | if (dev->parent != &wwandev->dev) |
407 | continue; |
408 | if (sscanf(dev_name(dev), fmt, &id) != 1) |
409 | continue; |
410 | if (id < 0 || id >= max_ports) |
411 | continue; |
412 | set_bit(nr: id, addr: idmap); |
413 | } |
414 | class_dev_iter_exit(iter: &iter); |
415 | |
416 | /* Allocate unique id */ |
417 | id = find_first_zero_bit(addr: idmap, size: max_ports); |
418 | bitmap_free(bitmap: idmap); |
419 | |
420 | snprintf(buf, size: sizeof(buf), fmt, id); /* Name generation */ |
421 | |
422 | dev = device_find_child_by_name(parent: &wwandev->dev, name: buf); |
423 | if (dev) { |
424 | put_device(dev); |
425 | return -ENFILE; |
426 | } |
427 | |
428 | return dev_set_name(dev: &port->dev, name: buf); |
429 | } |
430 | |
431 | struct wwan_port *wwan_create_port(struct device *parent, |
432 | enum wwan_port_type type, |
433 | const struct wwan_port_ops *ops, |
434 | struct wwan_port_caps *caps, |
435 | void *drvdata) |
436 | { |
437 | struct wwan_device *wwandev; |
438 | struct wwan_port *port; |
439 | char namefmt[0x20]; |
440 | int minor, err; |
441 | |
442 | if (type > WWAN_PORT_MAX || !ops) |
443 | return ERR_PTR(error: -EINVAL); |
444 | |
445 | /* A port is always a child of a WWAN device, retrieve (allocate or |
446 | * pick) the WWAN device based on the provided parent device. |
447 | */ |
448 | wwandev = wwan_create_dev(parent); |
449 | if (IS_ERR(ptr: wwandev)) |
450 | return ERR_CAST(ptr: wwandev); |
451 | |
452 | /* A port is exposed as character device, get a minor */ |
453 | minor = ida_alloc_range(&minors, min: 0, WWAN_MAX_MINORS - 1, GFP_KERNEL); |
454 | if (minor < 0) { |
455 | err = minor; |
456 | goto error_wwandev_remove; |
457 | } |
458 | |
459 | port = kzalloc(size: sizeof(*port), GFP_KERNEL); |
460 | if (!port) { |
461 | err = -ENOMEM; |
462 | ida_free(&minors, id: minor); |
463 | goto error_wwandev_remove; |
464 | } |
465 | |
466 | port->type = type; |
467 | port->ops = ops; |
468 | port->frag_len = caps ? caps->frag_len : SIZE_MAX; |
469 | port->headroom_len = caps ? caps->headroom_len : 0; |
470 | mutex_init(&port->ops_lock); |
471 | skb_queue_head_init(list: &port->rxq); |
472 | init_waitqueue_head(&port->waitqueue); |
473 | mutex_init(&port->data_lock); |
474 | |
475 | port->dev.parent = &wwandev->dev; |
476 | port->dev.class = wwan_class; |
477 | port->dev.type = &wwan_port_dev_type; |
478 | port->dev.devt = MKDEV(wwan_major, minor); |
479 | dev_set_drvdata(dev: &port->dev, data: drvdata); |
480 | |
481 | /* allocate unique name based on wwan device id, port type and number */ |
482 | snprintf(buf: namefmt, size: sizeof(namefmt), fmt: "wwan%u%s%%d" , wwandev->id, |
483 | wwan_port_types[port->type].devsuf); |
484 | |
485 | /* Serialize ports registration */ |
486 | mutex_lock(&wwan_register_lock); |
487 | |
488 | __wwan_port_dev_assign_name(port, fmt: namefmt); |
489 | err = device_register(dev: &port->dev); |
490 | |
491 | mutex_unlock(lock: &wwan_register_lock); |
492 | |
493 | if (err) |
494 | goto error_put_device; |
495 | |
496 | dev_info(&wwandev->dev, "port %s attached\n" , dev_name(&port->dev)); |
497 | return port; |
498 | |
499 | error_put_device: |
500 | put_device(dev: &port->dev); |
501 | error_wwandev_remove: |
502 | wwan_remove_dev(wwandev); |
503 | |
504 | return ERR_PTR(error: err); |
505 | } |
506 | EXPORT_SYMBOL_GPL(wwan_create_port); |
507 | |
508 | void wwan_remove_port(struct wwan_port *port) |
509 | { |
510 | struct wwan_device *wwandev = to_wwan_dev(port->dev.parent); |
511 | |
512 | mutex_lock(&port->ops_lock); |
513 | if (port->start_count) |
514 | port->ops->stop(port); |
515 | port->ops = NULL; /* Prevent any new port operations (e.g. from fops) */ |
516 | mutex_unlock(lock: &port->ops_lock); |
517 | |
518 | wake_up_interruptible(&port->waitqueue); |
519 | |
520 | skb_queue_purge(list: &port->rxq); |
521 | dev_set_drvdata(dev: &port->dev, NULL); |
522 | |
523 | dev_info(&wwandev->dev, "port %s disconnected\n" , dev_name(&port->dev)); |
524 | device_unregister(dev: &port->dev); |
525 | |
526 | /* Release related wwan device */ |
527 | wwan_remove_dev(wwandev); |
528 | } |
529 | EXPORT_SYMBOL_GPL(wwan_remove_port); |
530 | |
531 | void wwan_port_rx(struct wwan_port *port, struct sk_buff *skb) |
532 | { |
533 | skb_queue_tail(list: &port->rxq, newsk: skb); |
534 | wake_up_interruptible(&port->waitqueue); |
535 | } |
536 | EXPORT_SYMBOL_GPL(wwan_port_rx); |
537 | |
538 | void wwan_port_txon(struct wwan_port *port) |
539 | { |
540 | clear_bit(WWAN_PORT_TX_OFF, addr: &port->flags); |
541 | wake_up_interruptible(&port->waitqueue); |
542 | } |
543 | EXPORT_SYMBOL_GPL(wwan_port_txon); |
544 | |
545 | void wwan_port_txoff(struct wwan_port *port) |
546 | { |
547 | set_bit(WWAN_PORT_TX_OFF, addr: &port->flags); |
548 | } |
549 | EXPORT_SYMBOL_GPL(wwan_port_txoff); |
550 | |
551 | void *wwan_port_get_drvdata(struct wwan_port *port) |
552 | { |
553 | return dev_get_drvdata(dev: &port->dev); |
554 | } |
555 | EXPORT_SYMBOL_GPL(wwan_port_get_drvdata); |
556 | |
557 | static int wwan_port_op_start(struct wwan_port *port) |
558 | { |
559 | int ret = 0; |
560 | |
561 | mutex_lock(&port->ops_lock); |
562 | if (!port->ops) { /* Port got unplugged */ |
563 | ret = -ENODEV; |
564 | goto out_unlock; |
565 | } |
566 | |
567 | /* If port is already started, don't start again */ |
568 | if (!port->start_count) |
569 | ret = port->ops->start(port); |
570 | |
571 | if (!ret) |
572 | port->start_count++; |
573 | |
574 | out_unlock: |
575 | mutex_unlock(lock: &port->ops_lock); |
576 | |
577 | return ret; |
578 | } |
579 | |
580 | static void wwan_port_op_stop(struct wwan_port *port) |
581 | { |
582 | mutex_lock(&port->ops_lock); |
583 | port->start_count--; |
584 | if (!port->start_count) { |
585 | if (port->ops) |
586 | port->ops->stop(port); |
587 | skb_queue_purge(list: &port->rxq); |
588 | } |
589 | mutex_unlock(lock: &port->ops_lock); |
590 | } |
591 | |
592 | static int wwan_port_op_tx(struct wwan_port *port, struct sk_buff *skb, |
593 | bool nonblock) |
594 | { |
595 | int ret; |
596 | |
597 | mutex_lock(&port->ops_lock); |
598 | if (!port->ops) { /* Port got unplugged */ |
599 | ret = -ENODEV; |
600 | goto out_unlock; |
601 | } |
602 | |
603 | if (nonblock || !port->ops->tx_blocking) |
604 | ret = port->ops->tx(port, skb); |
605 | else |
606 | ret = port->ops->tx_blocking(port, skb); |
607 | |
608 | out_unlock: |
609 | mutex_unlock(lock: &port->ops_lock); |
610 | |
611 | return ret; |
612 | } |
613 | |
614 | static bool is_read_blocked(struct wwan_port *port) |
615 | { |
616 | return skb_queue_empty(list: &port->rxq) && port->ops; |
617 | } |
618 | |
619 | static bool is_write_blocked(struct wwan_port *port) |
620 | { |
621 | return test_bit(WWAN_PORT_TX_OFF, &port->flags) && port->ops; |
622 | } |
623 | |
624 | static int wwan_wait_rx(struct wwan_port *port, bool nonblock) |
625 | { |
626 | if (!is_read_blocked(port)) |
627 | return 0; |
628 | |
629 | if (nonblock) |
630 | return -EAGAIN; |
631 | |
632 | if (wait_event_interruptible(port->waitqueue, !is_read_blocked(port))) |
633 | return -ERESTARTSYS; |
634 | |
635 | return 0; |
636 | } |
637 | |
638 | static int wwan_wait_tx(struct wwan_port *port, bool nonblock) |
639 | { |
640 | if (!is_write_blocked(port)) |
641 | return 0; |
642 | |
643 | if (nonblock) |
644 | return -EAGAIN; |
645 | |
646 | if (wait_event_interruptible(port->waitqueue, !is_write_blocked(port))) |
647 | return -ERESTARTSYS; |
648 | |
649 | return 0; |
650 | } |
651 | |
652 | static int wwan_port_fops_open(struct inode *inode, struct file *file) |
653 | { |
654 | struct wwan_port *port; |
655 | int err = 0; |
656 | |
657 | port = wwan_port_get_by_minor(minor: iminor(inode)); |
658 | if (IS_ERR(ptr: port)) |
659 | return PTR_ERR(ptr: port); |
660 | |
661 | file->private_data = port; |
662 | stream_open(inode, filp: file); |
663 | |
664 | err = wwan_port_op_start(port); |
665 | if (err) |
666 | put_device(dev: &port->dev); |
667 | |
668 | return err; |
669 | } |
670 | |
671 | static int wwan_port_fops_release(struct inode *inode, struct file *filp) |
672 | { |
673 | struct wwan_port *port = filp->private_data; |
674 | |
675 | wwan_port_op_stop(port); |
676 | put_device(dev: &port->dev); |
677 | |
678 | return 0; |
679 | } |
680 | |
681 | static ssize_t wwan_port_fops_read(struct file *filp, char __user *buf, |
682 | size_t count, loff_t *ppos) |
683 | { |
684 | struct wwan_port *port = filp->private_data; |
685 | struct sk_buff *skb; |
686 | size_t copied; |
687 | int ret; |
688 | |
689 | ret = wwan_wait_rx(port, nonblock: !!(filp->f_flags & O_NONBLOCK)); |
690 | if (ret) |
691 | return ret; |
692 | |
693 | skb = skb_dequeue(list: &port->rxq); |
694 | if (!skb) |
695 | return -EIO; |
696 | |
697 | copied = min_t(size_t, count, skb->len); |
698 | if (copy_to_user(to: buf, from: skb->data, n: copied)) { |
699 | kfree_skb(skb); |
700 | return -EFAULT; |
701 | } |
702 | skb_pull(skb, len: copied); |
703 | |
704 | /* skb is not fully consumed, keep it in the queue */ |
705 | if (skb->len) |
706 | skb_queue_head(list: &port->rxq, newsk: skb); |
707 | else |
708 | consume_skb(skb); |
709 | |
710 | return copied; |
711 | } |
712 | |
713 | static ssize_t wwan_port_fops_write(struct file *filp, const char __user *buf, |
714 | size_t count, loff_t *offp) |
715 | { |
716 | struct sk_buff *skb, *head = NULL, *tail = NULL; |
717 | struct wwan_port *port = filp->private_data; |
718 | size_t frag_len, remain = count; |
719 | int ret; |
720 | |
721 | ret = wwan_wait_tx(port, nonblock: !!(filp->f_flags & O_NONBLOCK)); |
722 | if (ret) |
723 | return ret; |
724 | |
725 | do { |
726 | frag_len = min(remain, port->frag_len); |
727 | skb = alloc_skb(size: frag_len + port->headroom_len, GFP_KERNEL); |
728 | if (!skb) { |
729 | ret = -ENOMEM; |
730 | goto freeskb; |
731 | } |
732 | skb_reserve(skb, len: port->headroom_len); |
733 | |
734 | if (!head) { |
735 | head = skb; |
736 | } else if (!tail) { |
737 | skb_shinfo(head)->frag_list = skb; |
738 | tail = skb; |
739 | } else { |
740 | tail->next = skb; |
741 | tail = skb; |
742 | } |
743 | |
744 | if (copy_from_user(to: skb_put(skb, len: frag_len), from: buf + count - remain, n: frag_len)) { |
745 | ret = -EFAULT; |
746 | goto freeskb; |
747 | } |
748 | |
749 | if (skb != head) { |
750 | head->data_len += skb->len; |
751 | head->len += skb->len; |
752 | head->truesize += skb->truesize; |
753 | } |
754 | } while (remain -= frag_len); |
755 | |
756 | ret = wwan_port_op_tx(port, skb: head, nonblock: !!(filp->f_flags & O_NONBLOCK)); |
757 | if (!ret) |
758 | return count; |
759 | |
760 | freeskb: |
761 | kfree_skb(skb: head); |
762 | return ret; |
763 | } |
764 | |
765 | static __poll_t wwan_port_fops_poll(struct file *filp, poll_table *wait) |
766 | { |
767 | struct wwan_port *port = filp->private_data; |
768 | __poll_t mask = 0; |
769 | |
770 | poll_wait(filp, wait_address: &port->waitqueue, p: wait); |
771 | |
772 | mutex_lock(&port->ops_lock); |
773 | if (port->ops && port->ops->tx_poll) |
774 | mask |= port->ops->tx_poll(port, filp, wait); |
775 | else if (!is_write_blocked(port)) |
776 | mask |= EPOLLOUT | EPOLLWRNORM; |
777 | if (!is_read_blocked(port)) |
778 | mask |= EPOLLIN | EPOLLRDNORM; |
779 | if (!port->ops) |
780 | mask |= EPOLLHUP | EPOLLERR; |
781 | mutex_unlock(lock: &port->ops_lock); |
782 | |
783 | return mask; |
784 | } |
785 | |
786 | /* Implements minimalistic stub terminal IOCTLs support */ |
787 | static long wwan_port_fops_at_ioctl(struct wwan_port *port, unsigned int cmd, |
788 | unsigned long arg) |
789 | { |
790 | int ret = 0; |
791 | |
792 | mutex_lock(&port->data_lock); |
793 | |
794 | switch (cmd) { |
795 | case TCFLSH: |
796 | break; |
797 | |
798 | case TCGETS: |
799 | if (copy_to_user(to: (void __user *)arg, from: &port->at_data.termios, |
800 | n: sizeof(struct termios))) |
801 | ret = -EFAULT; |
802 | break; |
803 | |
804 | case TCSETS: |
805 | case TCSETSW: |
806 | case TCSETSF: |
807 | if (copy_from_user(to: &port->at_data.termios, from: (void __user *)arg, |
808 | n: sizeof(struct termios))) |
809 | ret = -EFAULT; |
810 | break; |
811 | |
812 | #ifdef TCGETS2 |
813 | case TCGETS2: |
814 | if (copy_to_user(to: (void __user *)arg, from: &port->at_data.termios, |
815 | n: sizeof(struct termios2))) |
816 | ret = -EFAULT; |
817 | break; |
818 | |
819 | case TCSETS2: |
820 | case TCSETSW2: |
821 | case TCSETSF2: |
822 | if (copy_from_user(to: &port->at_data.termios, from: (void __user *)arg, |
823 | n: sizeof(struct termios2))) |
824 | ret = -EFAULT; |
825 | break; |
826 | #endif |
827 | |
828 | case TIOCMGET: |
829 | ret = put_user(port->at_data.mdmbits, (int __user *)arg); |
830 | break; |
831 | |
832 | case TIOCMSET: |
833 | case TIOCMBIC: |
834 | case TIOCMBIS: { |
835 | int mdmbits; |
836 | |
837 | if (copy_from_user(to: &mdmbits, from: (int __user *)arg, n: sizeof(int))) { |
838 | ret = -EFAULT; |
839 | break; |
840 | } |
841 | if (cmd == TIOCMBIC) |
842 | port->at_data.mdmbits &= ~mdmbits; |
843 | else if (cmd == TIOCMBIS) |
844 | port->at_data.mdmbits |= mdmbits; |
845 | else |
846 | port->at_data.mdmbits = mdmbits; |
847 | break; |
848 | } |
849 | |
850 | default: |
851 | ret = -ENOIOCTLCMD; |
852 | } |
853 | |
854 | mutex_unlock(lock: &port->data_lock); |
855 | |
856 | return ret; |
857 | } |
858 | |
859 | static long wwan_port_fops_ioctl(struct file *filp, unsigned int cmd, |
860 | unsigned long arg) |
861 | { |
862 | struct wwan_port *port = filp->private_data; |
863 | int res; |
864 | |
865 | if (port->type == WWAN_PORT_AT) { /* AT port specific IOCTLs */ |
866 | res = wwan_port_fops_at_ioctl(port, cmd, arg); |
867 | if (res != -ENOIOCTLCMD) |
868 | return res; |
869 | } |
870 | |
871 | switch (cmd) { |
872 | case TIOCINQ: { /* aka SIOCINQ aka FIONREAD */ |
873 | unsigned long flags; |
874 | struct sk_buff *skb; |
875 | int amount = 0; |
876 | |
877 | spin_lock_irqsave(&port->rxq.lock, flags); |
878 | skb_queue_walk(&port->rxq, skb) |
879 | amount += skb->len; |
880 | spin_unlock_irqrestore(lock: &port->rxq.lock, flags); |
881 | |
882 | return put_user(amount, (int __user *)arg); |
883 | } |
884 | |
885 | default: |
886 | return -ENOIOCTLCMD; |
887 | } |
888 | } |
889 | |
890 | static const struct file_operations wwan_port_fops = { |
891 | .owner = THIS_MODULE, |
892 | .open = wwan_port_fops_open, |
893 | .release = wwan_port_fops_release, |
894 | .read = wwan_port_fops_read, |
895 | .write = wwan_port_fops_write, |
896 | .poll = wwan_port_fops_poll, |
897 | .unlocked_ioctl = wwan_port_fops_ioctl, |
898 | #ifdef CONFIG_COMPAT |
899 | .compat_ioctl = compat_ptr_ioctl, |
900 | #endif |
901 | .llseek = noop_llseek, |
902 | }; |
903 | |
904 | static int wwan_rtnl_validate(struct nlattr *tb[], struct nlattr *data[], |
905 | struct netlink_ext_ack *extack) |
906 | { |
907 | if (!data) |
908 | return -EINVAL; |
909 | |
910 | if (!tb[IFLA_PARENT_DEV_NAME]) |
911 | return -EINVAL; |
912 | |
913 | if (!data[IFLA_WWAN_LINK_ID]) |
914 | return -EINVAL; |
915 | |
916 | return 0; |
917 | } |
918 | |
919 | static struct device_type wwan_type = { .name = "wwan" }; |
920 | |
921 | static struct net_device *wwan_rtnl_alloc(struct nlattr *tb[], |
922 | const char *ifname, |
923 | unsigned char name_assign_type, |
924 | unsigned int num_tx_queues, |
925 | unsigned int num_rx_queues) |
926 | { |
927 | const char *devname = nla_data(nla: tb[IFLA_PARENT_DEV_NAME]); |
928 | struct wwan_device *wwandev = wwan_dev_get_by_name(name: devname); |
929 | struct net_device *dev; |
930 | unsigned int priv_size; |
931 | |
932 | if (IS_ERR(ptr: wwandev)) |
933 | return ERR_CAST(ptr: wwandev); |
934 | |
935 | /* only supported if ops were registered (not just ports) */ |
936 | if (!wwandev->ops) { |
937 | dev = ERR_PTR(error: -EOPNOTSUPP); |
938 | goto out; |
939 | } |
940 | |
941 | priv_size = sizeof(struct wwan_netdev_priv) + wwandev->ops->priv_size; |
942 | dev = alloc_netdev_mqs(sizeof_priv: priv_size, name: ifname, name_assign_type, |
943 | setup: wwandev->ops->setup, txqs: num_tx_queues, rxqs: num_rx_queues); |
944 | |
945 | if (dev) { |
946 | SET_NETDEV_DEV(dev, &wwandev->dev); |
947 | SET_NETDEV_DEVTYPE(dev, &wwan_type); |
948 | } |
949 | |
950 | out: |
951 | /* release the reference */ |
952 | put_device(dev: &wwandev->dev); |
953 | return dev; |
954 | } |
955 | |
956 | static int wwan_rtnl_newlink(struct net *src_net, struct net_device *dev, |
957 | struct nlattr *tb[], struct nlattr *data[], |
958 | struct netlink_ext_ack *extack) |
959 | { |
960 | struct wwan_device *wwandev = wwan_dev_get_by_parent(parent: dev->dev.parent); |
961 | u32 link_id = nla_get_u32(nla: data[IFLA_WWAN_LINK_ID]); |
962 | struct wwan_netdev_priv *priv = netdev_priv(dev); |
963 | int ret; |
964 | |
965 | if (IS_ERR(ptr: wwandev)) |
966 | return PTR_ERR(ptr: wwandev); |
967 | |
968 | /* shouldn't have a netdev (left) with us as parent so WARN */ |
969 | if (WARN_ON(!wwandev->ops)) { |
970 | ret = -EOPNOTSUPP; |
971 | goto out; |
972 | } |
973 | |
974 | priv->link_id = link_id; |
975 | if (wwandev->ops->newlink) |
976 | ret = wwandev->ops->newlink(wwandev->ops_ctxt, dev, |
977 | link_id, extack); |
978 | else |
979 | ret = register_netdevice(dev); |
980 | |
981 | out: |
982 | /* release the reference */ |
983 | put_device(dev: &wwandev->dev); |
984 | return ret; |
985 | } |
986 | |
987 | static void wwan_rtnl_dellink(struct net_device *dev, struct list_head *head) |
988 | { |
989 | struct wwan_device *wwandev = wwan_dev_get_by_parent(parent: dev->dev.parent); |
990 | |
991 | if (IS_ERR(ptr: wwandev)) |
992 | return; |
993 | |
994 | /* shouldn't have a netdev (left) with us as parent so WARN */ |
995 | if (WARN_ON(!wwandev->ops)) |
996 | goto out; |
997 | |
998 | if (wwandev->ops->dellink) |
999 | wwandev->ops->dellink(wwandev->ops_ctxt, dev, head); |
1000 | else |
1001 | unregister_netdevice_queue(dev, head); |
1002 | |
1003 | out: |
1004 | /* release the reference */ |
1005 | put_device(dev: &wwandev->dev); |
1006 | } |
1007 | |
1008 | static size_t wwan_rtnl_get_size(const struct net_device *dev) |
1009 | { |
1010 | return |
1011 | nla_total_size(payload: 4) + /* IFLA_WWAN_LINK_ID */ |
1012 | 0; |
1013 | } |
1014 | |
1015 | static int wwan_rtnl_fill_info(struct sk_buff *skb, |
1016 | const struct net_device *dev) |
1017 | { |
1018 | struct wwan_netdev_priv *priv = netdev_priv(dev); |
1019 | |
1020 | if (nla_put_u32(skb, attrtype: IFLA_WWAN_LINK_ID, value: priv->link_id)) |
1021 | goto nla_put_failure; |
1022 | |
1023 | return 0; |
1024 | |
1025 | nla_put_failure: |
1026 | return -EMSGSIZE; |
1027 | } |
1028 | |
1029 | static const struct nla_policy wwan_rtnl_policy[IFLA_WWAN_MAX + 1] = { |
1030 | [IFLA_WWAN_LINK_ID] = { .type = NLA_U32 }, |
1031 | }; |
1032 | |
1033 | static struct rtnl_link_ops wwan_rtnl_link_ops __read_mostly = { |
1034 | .kind = "wwan" , |
1035 | .maxtype = __IFLA_WWAN_MAX, |
1036 | .alloc = wwan_rtnl_alloc, |
1037 | .validate = wwan_rtnl_validate, |
1038 | .newlink = wwan_rtnl_newlink, |
1039 | .dellink = wwan_rtnl_dellink, |
1040 | .get_size = wwan_rtnl_get_size, |
1041 | .fill_info = wwan_rtnl_fill_info, |
1042 | .policy = wwan_rtnl_policy, |
1043 | }; |
1044 | |
1045 | static void wwan_create_default_link(struct wwan_device *wwandev, |
1046 | u32 def_link_id) |
1047 | { |
1048 | struct nlattr *tb[IFLA_MAX + 1], *linkinfo[IFLA_INFO_MAX + 1]; |
1049 | struct nlattr *data[IFLA_WWAN_MAX + 1]; |
1050 | struct net_device *dev; |
1051 | struct nlmsghdr *nlh; |
1052 | struct sk_buff *msg; |
1053 | |
1054 | /* Forge attributes required to create a WWAN netdev. We first |
1055 | * build a netlink message and then parse it. This looks |
1056 | * odd, but such approach is less error prone. |
1057 | */ |
1058 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1059 | if (WARN_ON(!msg)) |
1060 | return; |
1061 | nlh = nlmsg_put(skb: msg, portid: 0, seq: 0, RTM_NEWLINK, payload: 0, flags: 0); |
1062 | if (WARN_ON(!nlh)) |
1063 | goto free_attrs; |
1064 | |
1065 | if (nla_put_string(skb: msg, attrtype: IFLA_PARENT_DEV_NAME, str: dev_name(dev: &wwandev->dev))) |
1066 | goto free_attrs; |
1067 | tb[IFLA_LINKINFO] = nla_nest_start(skb: msg, IFLA_LINKINFO); |
1068 | if (!tb[IFLA_LINKINFO]) |
1069 | goto free_attrs; |
1070 | linkinfo[IFLA_INFO_DATA] = nla_nest_start(skb: msg, attrtype: IFLA_INFO_DATA); |
1071 | if (!linkinfo[IFLA_INFO_DATA]) |
1072 | goto free_attrs; |
1073 | if (nla_put_u32(skb: msg, attrtype: IFLA_WWAN_LINK_ID, value: def_link_id)) |
1074 | goto free_attrs; |
1075 | nla_nest_end(skb: msg, start: linkinfo[IFLA_INFO_DATA]); |
1076 | nla_nest_end(skb: msg, start: tb[IFLA_LINKINFO]); |
1077 | |
1078 | nlmsg_end(skb: msg, nlh); |
1079 | |
1080 | /* The next three parsing calls can not fail */ |
1081 | nlmsg_parse_deprecated(nlh, hdrlen: 0, tb, IFLA_MAX, NULL, NULL); |
1082 | nla_parse_nested_deprecated(tb: linkinfo, IFLA_INFO_MAX, nla: tb[IFLA_LINKINFO], |
1083 | NULL, NULL); |
1084 | nla_parse_nested_deprecated(tb: data, IFLA_WWAN_MAX, |
1085 | nla: linkinfo[IFLA_INFO_DATA], NULL, NULL); |
1086 | |
1087 | rtnl_lock(); |
1088 | |
1089 | dev = rtnl_create_link(net: &init_net, ifname: "wwan%d" , NET_NAME_ENUM, |
1090 | ops: &wwan_rtnl_link_ops, tb, NULL); |
1091 | if (WARN_ON(IS_ERR(dev))) |
1092 | goto unlock; |
1093 | |
1094 | if (WARN_ON(wwan_rtnl_newlink(&init_net, dev, tb, data, NULL))) { |
1095 | free_netdev(dev); |
1096 | goto unlock; |
1097 | } |
1098 | |
1099 | rtnl_configure_link(dev, NULL, portid: 0, NULL); /* Link initialized, notify new link */ |
1100 | |
1101 | unlock: |
1102 | rtnl_unlock(); |
1103 | |
1104 | free_attrs: |
1105 | nlmsg_free(skb: msg); |
1106 | } |
1107 | |
1108 | /** |
1109 | * wwan_register_ops - register WWAN device ops |
1110 | * @parent: Device to use as parent and shared by all WWAN ports and |
1111 | * created netdevs |
1112 | * @ops: operations to register |
1113 | * @ctxt: context to pass to operations |
1114 | * @def_link_id: id of the default link that will be automatically created by |
1115 | * the WWAN core for the WWAN device. The default link will not be created |
1116 | * if the passed value is WWAN_NO_DEFAULT_LINK. |
1117 | * |
1118 | * Returns: 0 on success, a negative error code on failure |
1119 | */ |
1120 | int wwan_register_ops(struct device *parent, const struct wwan_ops *ops, |
1121 | void *ctxt, u32 def_link_id) |
1122 | { |
1123 | struct wwan_device *wwandev; |
1124 | |
1125 | if (WARN_ON(!parent || !ops || !ops->setup)) |
1126 | return -EINVAL; |
1127 | |
1128 | wwandev = wwan_create_dev(parent); |
1129 | if (IS_ERR(ptr: wwandev)) |
1130 | return PTR_ERR(ptr: wwandev); |
1131 | |
1132 | if (WARN_ON(wwandev->ops)) { |
1133 | wwan_remove_dev(wwandev); |
1134 | return -EBUSY; |
1135 | } |
1136 | |
1137 | wwandev->ops = ops; |
1138 | wwandev->ops_ctxt = ctxt; |
1139 | |
1140 | /* NB: we do not abort ops registration in case of default link |
1141 | * creation failure. Link ops is the management interface, while the |
1142 | * default link creation is a service option. And we should not prevent |
1143 | * a user from manually creating a link latter if service option failed |
1144 | * now. |
1145 | */ |
1146 | if (def_link_id != WWAN_NO_DEFAULT_LINK) |
1147 | wwan_create_default_link(wwandev, def_link_id); |
1148 | |
1149 | return 0; |
1150 | } |
1151 | EXPORT_SYMBOL_GPL(wwan_register_ops); |
1152 | |
1153 | /* Enqueue child netdev deletion */ |
1154 | static int wwan_child_dellink(struct device *dev, void *data) |
1155 | { |
1156 | struct list_head *kill_list = data; |
1157 | |
1158 | if (dev->type == &wwan_type) |
1159 | wwan_rtnl_dellink(to_net_dev(dev), head: kill_list); |
1160 | |
1161 | return 0; |
1162 | } |
1163 | |
1164 | /** |
1165 | * wwan_unregister_ops - remove WWAN device ops |
1166 | * @parent: Device to use as parent and shared by all WWAN ports and |
1167 | * created netdevs |
1168 | */ |
1169 | void wwan_unregister_ops(struct device *parent) |
1170 | { |
1171 | struct wwan_device *wwandev = wwan_dev_get_by_parent(parent); |
1172 | LIST_HEAD(kill_list); |
1173 | |
1174 | if (WARN_ON(IS_ERR(wwandev))) |
1175 | return; |
1176 | if (WARN_ON(!wwandev->ops)) { |
1177 | put_device(dev: &wwandev->dev); |
1178 | return; |
1179 | } |
1180 | |
1181 | /* put the reference obtained by wwan_dev_get_by_parent(), |
1182 | * we should still have one (that the owner is giving back |
1183 | * now) due to the ops being assigned. |
1184 | */ |
1185 | put_device(dev: &wwandev->dev); |
1186 | |
1187 | rtnl_lock(); /* Prevent concurrent netdev(s) creation/destroying */ |
1188 | |
1189 | /* Remove all child netdev(s), using batch removing */ |
1190 | device_for_each_child(dev: &wwandev->dev, data: &kill_list, |
1191 | fn: wwan_child_dellink); |
1192 | unregister_netdevice_many(head: &kill_list); |
1193 | |
1194 | wwandev->ops = NULL; /* Finally remove ops */ |
1195 | |
1196 | rtnl_unlock(); |
1197 | |
1198 | wwandev->ops_ctxt = NULL; |
1199 | wwan_remove_dev(wwandev); |
1200 | } |
1201 | EXPORT_SYMBOL_GPL(wwan_unregister_ops); |
1202 | |
1203 | static int __init wwan_init(void) |
1204 | { |
1205 | int err; |
1206 | |
1207 | err = rtnl_link_register(ops: &wwan_rtnl_link_ops); |
1208 | if (err) |
1209 | return err; |
1210 | |
1211 | wwan_class = class_create(name: "wwan" ); |
1212 | if (IS_ERR(ptr: wwan_class)) { |
1213 | err = PTR_ERR(ptr: wwan_class); |
1214 | goto unregister; |
1215 | } |
1216 | |
1217 | /* chrdev used for wwan ports */ |
1218 | wwan_major = __register_chrdev(major: 0, baseminor: 0, WWAN_MAX_MINORS, name: "wwan_port" , |
1219 | fops: &wwan_port_fops); |
1220 | if (wwan_major < 0) { |
1221 | err = wwan_major; |
1222 | goto destroy; |
1223 | } |
1224 | |
1225 | #ifdef CONFIG_WWAN_DEBUGFS |
1226 | wwan_debugfs_dir = debugfs_create_dir(name: "wwan" , NULL); |
1227 | #endif |
1228 | |
1229 | return 0; |
1230 | |
1231 | destroy: |
1232 | class_destroy(cls: wwan_class); |
1233 | unregister: |
1234 | rtnl_link_unregister(ops: &wwan_rtnl_link_ops); |
1235 | return err; |
1236 | } |
1237 | |
1238 | static void __exit wwan_exit(void) |
1239 | { |
1240 | debugfs_remove_recursive(dentry: wwan_debugfs_dir); |
1241 | __unregister_chrdev(major: wwan_major, baseminor: 0, WWAN_MAX_MINORS, name: "wwan_port" ); |
1242 | rtnl_link_unregister(ops: &wwan_rtnl_link_ops); |
1243 | class_destroy(cls: wwan_class); |
1244 | } |
1245 | |
1246 | module_init(wwan_init); |
1247 | module_exit(wwan_exit); |
1248 | |
1249 | MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>" ); |
1250 | MODULE_DESCRIPTION("WWAN core" ); |
1251 | MODULE_LICENSE("GPL v2" ); |
1252 | |