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1 | /* |
2 | * This program is free software; you can redistribute it and/or modify |
3 | * it under the terms of the GNU General Public License as published by |
4 | * the Free Software Foundation; either version 2 of the License, or |
5 | * (at your option) any later version. |
6 | * |
7 | * This program is distributed in the hope that it will be useful, |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | * GNU General Public License for more details. |
11 | * |
12 | * You should have received a copy of the GNU General Public License |
13 | * along with this program; if not, write to the Free Software |
14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
15 | * |
16 | */ |
17 | |
18 | #include <linux/init.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/usb.h> |
21 | |
22 | #include "usbaudio.h" |
23 | #include "helper.h" |
24 | |
25 | /* |
26 | * combine bytes and get an integer value |
27 | */ |
28 | unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size) |
29 | { |
30 | switch (size) { |
31 | case 1: return *bytes; |
32 | case 2: return combine_word(bytes); |
33 | case 3: return combine_triple(bytes); |
34 | case 4: return combine_quad(bytes); |
35 | default: return 0; |
36 | } |
37 | } |
38 | |
39 | /* |
40 | * parse descriptor buffer and return the pointer starting the given |
41 | * descriptor type. |
42 | */ |
43 | void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype) |
44 | { |
45 | u8 *p, *end, *next; |
46 | |
47 | p = descstart; |
48 | end = p + desclen; |
49 | for (; p < end;) { |
50 | if (p[0] < 2) |
51 | return NULL; |
52 | next = p + p[0]; |
53 | if (next > end) |
54 | return NULL; |
55 | if (p[1] == dtype && (!after || (void *)p > after)) { |
56 | return p; |
57 | } |
58 | p = next; |
59 | } |
60 | return NULL; |
61 | } |
62 | |
63 | /* |
64 | * find a class-specified interface descriptor with the given subtype. |
65 | */ |
66 | void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype) |
67 | { |
68 | unsigned char *p = after; |
69 | |
70 | while ((p = snd_usb_find_desc(buffer, buflen, p, |
71 | USB_DT_CS_INTERFACE)) != NULL) { |
72 | if (p[0] >= 3 && p[2] == dsubtype) |
73 | return p; |
74 | } |
75 | return NULL; |
76 | } |
77 | |
78 | /* |
79 | * Wrapper for usb_control_msg(). |
80 | * Allocates a temp buffer to prevent dmaing from/to the stack. |
81 | */ |
82 | int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, |
83 | __u8 requesttype, __u16 value, __u16 index, void *data, |
84 | __u16 size, int timeout) |
85 | { |
86 | int err; |
87 | void *buf = NULL; |
88 | |
89 | if (size > 0) { |
90 | buf = kmemdup(data, size, GFP_KERNEL); |
91 | if (!buf) |
92 | return -ENOMEM; |
93 | } |
94 | err = usb_control_msg(dev, pipe, request, requesttype, |
95 | value, index, buf, size, timeout); |
96 | if (size > 0) { |
97 | memcpy(data, buf, size); |
98 | kfree(buf); |
99 | } |
100 | return err; |
101 | } |
102 | |
103 | unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip, |
104 | struct usb_host_interface *alts) |
105 | { |
106 | switch (snd_usb_get_speed(chip->dev)) { |
107 | case USB_SPEED_HIGH: |
108 | case USB_SPEED_SUPER: |
109 | if (get_endpoint(alts, 0)->bInterval >= 1 && |
110 | get_endpoint(alts, 0)->bInterval <= 4) |
111 | return get_endpoint(alts, 0)->bInterval - 1; |
112 | break; |
113 | default: |
114 | break; |
115 | } |
116 | return 0; |
117 | } |
118 | |
119 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9