tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Line6 Linux USB driver - 0.8.0
3 *
4 * Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#include "driver.h"
13#include "dumprequest.h"
14
15
16/*
17 Set "dump in progress" flag.
18*/
19void line6_dump_started(struct line6_dump_request *l6dr, int dest)
20{
21 l6dr->in_progress = dest;
22}
23
24/*
25 Invalidate current channel, i.e., set "dump in progress" flag.
26 Reading from the "dump" special file blocks until dump is completed.
27*/
28void line6_invalidate_current(struct line6_dump_request *l6dr)
29{
30 line6_dump_started(l6dr, LINE6_DUMP_CURRENT);
31}
32
33/*
34 Clear "dump in progress" flag and notify waiting processes.
35*/
36void line6_dump_finished(struct line6_dump_request *l6dr)
37{
38 l6dr->in_progress = LINE6_DUMP_NONE;
39 wake_up_interruptible(&l6dr->wait);
40}
41
42/*
43 Send an asynchronous channel dump request.
44*/
45int line6_dump_request_async(struct line6_dump_request *l6dr,
46 struct usb_line6 *line6, int num)
47{
48 int ret;
49 line6_invalidate_current(l6dr);
50 ret = line6_send_raw_message_async(line6, l6dr->reqbufs[num].buffer,
51 l6dr->reqbufs[num].length);
52
53 if (ret < 0)
54 line6_dump_finished(l6dr);
55
56 return ret;
57}
58
59/*
60 Send an asynchronous dump request after a given interval.
61*/
62void line6_startup_delayed(struct line6_dump_request *l6dr, int seconds,
63 void (*function)(unsigned long), void *data)
64{
65 l6dr->timer.expires = jiffies + seconds * HZ;
66 l6dr->timer.function = function;
67 l6dr->timer.data = (unsigned long)data;
68 add_timer(&l6dr->timer);
69}
70
71/*
72 Wait for completion.
73*/
74int line6_wait_dump(struct line6_dump_request *l6dr, int nonblock)
75{
76 int retval = 0;
77 DECLARE_WAITQUEUE(wait, current);
78 add_wait_queue(&l6dr->wait, &wait);
79 current->state = TASK_INTERRUPTIBLE;
80
81 while (l6dr->in_progress) {
82 if (nonblock) {
83 retval = -EAGAIN;
84 break;
85 }
86
87 if (signal_pending(current)) {
88 retval = -ERESTARTSYS;
89 break;
90 } else
91 schedule();
92 }
93
94 current->state = TASK_RUNNING;
95 remove_wait_queue(&l6dr->wait, &wait);
96 return retval;
97}
98
99/*
100 Initialize dump request buffer.
101*/
102int line6_dumpreq_initbuf(struct line6_dump_request *l6dr, const void *buf,
103 size_t len, int num)
104{
105 l6dr->reqbufs[num].buffer = kmalloc(len, GFP_KERNEL);
106 if (l6dr->reqbufs[num].buffer == NULL)
107 return -ENOMEM;
108 memcpy(l6dr->reqbufs[num].buffer, buf, len);
109 l6dr->reqbufs[num].length = len;
110 return 0;
111}
112
113/*
114 Initialize dump request data structure (including one buffer).
115*/
116int line6_dumpreq_init(struct line6_dump_request *l6dr, const void *buf,
117 size_t len)
118{
119 int ret;
120 ret = line6_dumpreq_initbuf(l6dr, buf, len, 0);
121 if (ret < 0)
122 return ret;
123 init_waitqueue_head(&l6dr->wait);
124 init_timer(&l6dr->timer);
125 return 0;
126}
127
128/*
129 Destruct dump request data structure.
130*/
131void line6_dumpreq_destructbuf(struct line6_dump_request *l6dr, int num)
132{
133 if (l6dr == NULL)
134 return;
135 if (l6dr->reqbufs[num].buffer == NULL)
136 return;
137 kfree(l6dr->reqbufs[num].buffer);
138 l6dr->reqbufs[num].buffer = NULL;
139}
140
141/*
142 Destruct dump request data structure.
143*/
144void line6_dumpreq_destruct(struct line6_dump_request *l6dr)
145{
146 if (l6dr->reqbufs[0].buffer == NULL)
147 return;
148 line6_dumpreq_destructbuf(l6dr, 0);
149 l6dr->ok = 1;
150 del_timer_sync(&l6dr->timer);
151}