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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 | #include "quirks.h" |
25 | |
26 | /* |
27 | * combine bytes and get an integer value |
28 | */ |
29 | unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size) |
30 | { |
31 | switch (size) { |
32 | case 1: return *bytes; |
33 | case 2: return combine_word(bytes); |
34 | case 3: return combine_triple(bytes); |
35 | case 4: return combine_quad(bytes); |
36 | default: return 0; |
37 | } |
38 | } |
39 | |
40 | /* |
41 | * parse descriptor buffer and return the pointer starting the given |
42 | * descriptor type. |
43 | */ |
44 | void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype) |
45 | { |
46 | u8 *p, *end, *next; |
47 | |
48 | p = descstart; |
49 | end = p + desclen; |
50 | for (; p < end;) { |
51 | if (p[0] < 2) |
52 | return NULL; |
53 | next = p + p[0]; |
54 | if (next > end) |
55 | return NULL; |
56 | if (p[1] == dtype && (!after || (void *)p > after)) { |
57 | return p; |
58 | } |
59 | p = next; |
60 | } |
61 | return NULL; |
62 | } |
63 | |
64 | /* |
65 | * find a class-specified interface descriptor with the given subtype. |
66 | */ |
67 | void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype) |
68 | { |
69 | unsigned char *p = after; |
70 | |
71 | while ((p = snd_usb_find_desc(buffer, buflen, p, |
72 | USB_DT_CS_INTERFACE)) != NULL) { |
73 | if (p[0] >= 3 && p[2] == dsubtype) |
74 | return p; |
75 | } |
76 | return NULL; |
77 | } |
78 | |
79 | /* |
80 | * Wrapper for usb_control_msg(). |
81 | * Allocates a temp buffer to prevent dmaing from/to the stack. |
82 | */ |
83 | int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, |
84 | __u8 requesttype, __u16 value, __u16 index, void *data, |
85 | __u16 size) |
86 | { |
87 | int err; |
88 | void *buf = NULL; |
89 | int timeout; |
90 | |
91 | if (size > 0) { |
92 | buf = kmemdup(data, size, GFP_KERNEL); |
93 | if (!buf) |
94 | return -ENOMEM; |
95 | } |
96 | |
97 | if (requesttype & USB_DIR_IN) |
98 | timeout = USB_CTRL_GET_TIMEOUT; |
99 | else |
100 | timeout = USB_CTRL_SET_TIMEOUT; |
101 | |
102 | err = usb_control_msg(dev, pipe, request, requesttype, |
103 | value, index, buf, size, timeout); |
104 | |
105 | if (size > 0) { |
106 | memcpy(data, buf, size); |
107 | kfree(buf); |
108 | } |
109 | |
110 | snd_usb_ctl_msg_quirk(dev, pipe, request, requesttype, |
111 | value, index, data, size); |
112 | |
113 | return err; |
114 | } |
115 | |
116 | unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip, |
117 | struct usb_host_interface *alts) |
118 | { |
119 | switch (snd_usb_get_speed(chip->dev)) { |
120 | case USB_SPEED_HIGH: |
121 | case USB_SPEED_WIRELESS: |
122 | case USB_SPEED_SUPER: |
123 | if (get_endpoint(alts, 0)->bInterval >= 1 && |
124 | get_endpoint(alts, 0)->bInterval <= 4) |
125 | return get_endpoint(alts, 0)->bInterval - 1; |
126 | break; |
127 | default: |
128 | break; |
129 | } |
130 | return 0; |
131 | } |
132 | |
133 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9