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9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/usb.h>
12#include <linux/notifier.h>
13#include <linux/mutex.h>
14
15#include "usb_mon.h"
16#include "../core/hcd.h"
17
18static void mon_stop(struct mon_bus *mbus);
19static void mon_dissolve(struct mon_bus *mbus, struct usb_bus *ubus);
20static void mon_bus_drop(struct kref *r);
21static void mon_bus_init(struct usb_bus *ubus);
22
23DEFINE_MUTEX(mon_lock);
24
25struct mon_bus mon_bus0;
26static LIST_HEAD(mon_buses);
27
28
29
30
31
32
33void mon_reader_add(struct mon_bus *mbus, struct mon_reader *r)
34{
35 unsigned long flags;
36 struct list_head *p;
37
38 spin_lock_irqsave(&mbus->lock, flags);
39 if (mbus->nreaders == 0) {
40 if (mbus == &mon_bus0) {
41 list_for_each (p, &mon_buses) {
42 struct mon_bus *m1;
43 m1 = list_entry(p, struct mon_bus, bus_link);
44 m1->u_bus->monitored = 1;
45 }
46 } else {
47 mbus->u_bus->monitored = 1;
48 }
49 }
50 mbus->nreaders++;
51 list_add_tail(&r->r_link, &mbus->r_list);
52 spin_unlock_irqrestore(&mbus->lock, flags);
53
54 kref_get(&mbus->ref);
55}
56
57
58
59
60
61
62void mon_reader_del(struct mon_bus *mbus, struct mon_reader *r)
63{
64 unsigned long flags;
65
66 spin_lock_irqsave(&mbus->lock, flags);
67 list_del(&r->r_link);
68 --mbus->nreaders;
69 if (mbus->nreaders == 0)
70 mon_stop(mbus);
71 spin_unlock_irqrestore(&mbus->lock, flags);
72
73 kref_put(&mbus->ref, mon_bus_drop);
74}
75
76
77
78static void mon_bus_submit(struct mon_bus *mbus, struct urb *urb)
79{
80 unsigned long flags;
81 struct list_head *pos;
82 struct mon_reader *r;
83
84 spin_lock_irqsave(&mbus->lock, flags);
85 mbus->cnt_events++;
86 list_for_each (pos, &mbus->r_list) {
87 r = list_entry(pos, struct mon_reader, r_link);
88 r->rnf_submit(r->r_data, urb);
89 }
90 spin_unlock_irqrestore(&mbus->lock, flags);
91 return;
92}
93
94static void mon_submit(struct usb_bus *ubus, struct urb *urb)
95{
96 struct mon_bus *mbus;
97
98 if ((mbus = ubus->mon_bus) != NULL)
99 mon_bus_submit(mbus, urb);
100 mon_bus_submit(&mon_bus0, urb);
101}
102
103
104
105static void mon_bus_submit_error(struct mon_bus *mbus, struct urb *urb, int error)
106{
107 unsigned long flags;
108 struct list_head *pos;
109 struct mon_reader *r;
110
111 spin_lock_irqsave(&mbus->lock, flags);
112 mbus->cnt_events++;
113 list_for_each (pos, &mbus->r_list) {
114 r = list_entry(pos, struct mon_reader, r_link);
115 r->rnf_error(r->r_data, urb, error);
116 }
117 spin_unlock_irqrestore(&mbus->lock, flags);
118 return;
119}
120
121static void mon_submit_error(struct usb_bus *ubus, struct urb *urb, int error)
122{
123 struct mon_bus *mbus;
124
125 if ((mbus = ubus->mon_bus) != NULL)
126 mon_bus_submit_error(mbus, urb, error);
127 mon_bus_submit_error(&mon_bus0, urb, error);
128}
129
130
131
132static void mon_bus_complete(struct mon_bus *mbus, struct urb *urb, int status)
133{
134 unsigned long flags;
135 struct list_head *pos;
136 struct mon_reader *r;
137
138 spin_lock_irqsave(&mbus->lock, flags);
139 mbus->cnt_events++;
140 list_for_each (pos, &mbus->r_list) {
141 r = list_entry(pos, struct mon_reader, r_link);
142 r->rnf_complete(r->r_data, urb, status);
143 }
144 spin_unlock_irqrestore(&mbus->lock, flags);
145}
146
147static void mon_complete(struct usb_bus *ubus, struct urb *urb, int status)
148{
149 struct mon_bus *mbus;
150
151 if ((mbus = ubus->mon_bus) != NULL)
152 mon_bus_complete(mbus, urb, status);
153 mon_bus_complete(&mon_bus0, urb, status);
154}
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159
160
161static void mon_stop(struct mon_bus *mbus)
162{
163 struct usb_bus *ubus;
164 struct list_head *p;
165
166 if (mbus == &mon_bus0) {
167 list_for_each (p, &mon_buses) {
168 mbus = list_entry(p, struct mon_bus, bus_link);
169
170
171
172 if (mbus->nreaders == 0 && (ubus = mbus->u_bus) != NULL)
173 ubus->monitored = 0;
174 }
175 } else {
176
177
178
179
180 if (mon_bus0.nreaders == 0 && (ubus = mbus->u_bus) != NULL) {
181 ubus->monitored = 0;
182 mb();
183 }
184 }
185}
186
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189
190
191
192
193static void mon_bus_add(struct usb_bus *ubus)
194{
195 mon_bus_init(ubus);
196 mutex_lock(&mon_lock);
197 if (mon_bus0.nreaders != 0)
198 ubus->monitored = 1;
199 mutex_unlock(&mon_lock);
200}
201
202
203
204
205static void mon_bus_remove(struct usb_bus *ubus)
206{
207 struct mon_bus *mbus = ubus->mon_bus;
208
209 mutex_lock(&mon_lock);
210 list_del(&mbus->bus_link);
211 if (mbus->text_inited)
212 mon_text_del(mbus);
213 if (mbus->bin_inited)
214 mon_bin_del(mbus);
215
216 mon_dissolve(mbus, ubus);
217 kref_put(&mbus->ref, mon_bus_drop);
218 mutex_unlock(&mon_lock);
219}
220
221static int mon_notify(struct notifier_block *self, unsigned long action,
222 void *dev)
223{
224 switch (action) {
225 case USB_BUS_ADD:
226 mon_bus_add(dev);
227 break;
228 case USB_BUS_REMOVE:
229 mon_bus_remove(dev);
230 }
231 return NOTIFY_OK;
232}
233
234static struct notifier_block mon_nb = {
235 .notifier_call = mon_notify,
236};
237
238
239
240
241static struct usb_mon_operations mon_ops_0 = {
242 .urb_submit = mon_submit,
243 .urb_submit_error = mon_submit_error,
244 .urb_complete = mon_complete,
245};
246
247
248
249
250static void mon_dissolve(struct mon_bus *mbus, struct usb_bus *ubus)
251{
252
253 if (ubus->monitored) {
254 ubus->monitored = 0;
255 mb();
256 }
257
258 ubus->mon_bus = NULL;
259 mbus->u_bus = NULL;
260 mb();
261
262
263}
264
265
266
267static void mon_bus_drop(struct kref *r)
268{
269 struct mon_bus *mbus = container_of(r, struct mon_bus, ref);
270 kfree(mbus);
271}
272
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277
278
279static void mon_bus_init(struct usb_bus *ubus)
280{
281 struct mon_bus *mbus;
282
283 if ((mbus = kzalloc(sizeof(struct mon_bus), GFP_KERNEL)) == NULL)
284 goto err_alloc;
285 kref_init(&mbus->ref);
286 spin_lock_init(&mbus->lock);
287 INIT_LIST_HEAD(&mbus->r_list);
288
289
290
291
292
293 mbus->u_bus = ubus;
294 ubus->mon_bus = mbus;
295
296 mbus->text_inited = mon_text_add(mbus, ubus);
297 mbus->bin_inited = mon_bin_add(mbus, ubus);
298
299 mutex_lock(&mon_lock);
300 list_add_tail(&mbus->bus_link, &mon_buses);
301 mutex_unlock(&mon_lock);
302 return;
303
304err_alloc:
305 return;
306}
307
308static void mon_bus0_init(void)
309{
310 struct mon_bus *mbus = &mon_bus0;
311
312 kref_init(&mbus->ref);
313 spin_lock_init(&mbus->lock);
314 INIT_LIST_HEAD(&mbus->r_list);
315
316 mbus->text_inited = mon_text_add(mbus, NULL);
317 mbus->bin_inited = mon_bin_add(mbus, NULL);
318}
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325
326
327
328struct mon_bus *mon_bus_lookup(unsigned int num)
329{
330 struct list_head *p;
331 struct mon_bus *mbus;
332
333 if (num == 0) {
334 return &mon_bus0;
335 }
336 list_for_each (p, &mon_buses) {
337 mbus = list_entry(p, struct mon_bus, bus_link);
338 if (mbus->u_bus->busnum == num) {
339 return mbus;
340 }
341 }
342 return NULL;
343}
344
345static int __init mon_init(void)
346{
347 struct usb_bus *ubus;
348 int rc;
349
350 if ((rc = mon_text_init()) != 0)
351 goto err_text;
352 if ((rc = mon_bin_init()) != 0)
353 goto err_bin;
354
355 mon_bus0_init();
356
357 if (usb_mon_register(&mon_ops_0) != 0) {
358 printk(KERN_NOTICE TAG ": unable to register with the core\n");
359 rc = -ENODEV;
360 goto err_reg;
361 }
362
363
364 mutex_lock(&usb_bus_list_lock);
365 list_for_each_entry (ubus, &usb_bus_list, bus_list) {
366 mon_bus_init(ubus);
367 }
368 usb_register_notify(&mon_nb);
369 mutex_unlock(&usb_bus_list_lock);
370 return 0;
371
372err_reg:
373 mon_bin_exit();
374err_bin:
375 mon_text_exit();
376err_text:
377 return rc;
378}
379
380static void __exit mon_exit(void)
381{
382 struct mon_bus *mbus;
383 struct list_head *p;
384
385 usb_unregister_notify(&mon_nb);
386 usb_mon_deregister();
387
388 mutex_lock(&mon_lock);
389
390 while (!list_empty(&mon_buses)) {
391 p = mon_buses.next;
392 mbus = list_entry(p, struct mon_bus, bus_link);
393 list_del(p);
394
395 if (mbus->text_inited)
396 mon_text_del(mbus);
397 if (mbus->bin_inited)
398 mon_bin_del(mbus);
399
400
401
402
403
404
405 if (mbus->nreaders) {
406 printk(KERN_ERR TAG
407 ": Outstanding opens (%d) on usb%d, leaking...\n",
408 mbus->nreaders, mbus->u_bus->busnum);
409 atomic_set(&mbus->ref.refcount, 2);
410 }
411
412 mon_dissolve(mbus, mbus->u_bus);
413 kref_put(&mbus->ref, mon_bus_drop);
414 }
415
416 mbus = &mon_bus0;
417 if (mbus->text_inited)
418 mon_text_del(mbus);
419 if (mbus->bin_inited)
420 mon_bin_del(mbus);
421
422 mutex_unlock(&mon_lock);
423
424 mon_text_exit();
425 mon_bin_exit();
426}
427
428module_init(mon_init);
429module_exit(mon_exit);
430
431MODULE_LICENSE("GPL");
432