Contributors: 12
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Daniel Mack |
272 |
48.40% |
4 |
19.05% |
| Jaroslav Kysela |
94 |
16.73% |
5 |
23.81% |
| Karsten Wiese |
83 |
14.77% |
1 |
4.76% |
| Takashi Iwai |
60 |
10.68% |
3 |
14.29% |
| Daniel Schürmann |
19 |
3.38% |
1 |
4.76% |
| Paul Zimmerman |
14 |
2.49% |
1 |
4.76% |
| Clemens Ladisch |
8 |
1.42% |
1 |
4.76% |
| Oliver Neukum |
3 |
0.53% |
1 |
4.76% |
| Linus Torvalds (pre-git) |
3 |
0.53% |
1 |
4.76% |
| Stephen Rothwell |
3 |
0.53% |
1 |
4.76% |
| Thomas Gleixner |
2 |
0.36% |
1 |
4.76% |
| Greg Kroah-Hartman |
1 |
0.18% |
1 |
4.76% |
| Total |
562 |
|
21 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include "usbaudio.h"
#include "helper.h"
#include "quirks.h"
/*
* combine bytes and get an integer value
*/
unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
{
switch (size) {
case 1: return *bytes;
case 2: return combine_word(bytes);
case 3: return combine_triple(bytes);
case 4: return combine_quad(bytes);
default: return 0;
}
}
/*
* parse descriptor buffer and return the pointer starting the given
* descriptor type.
*/
void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
{
u8 *p, *end, *next;
p = descstart;
end = p + desclen;
for (; p < end;) {
if (p[0] < 2)
return NULL;
next = p + p[0];
if (next > end)
return NULL;
if (p[1] == dtype && (!after || (void *)p > after)) {
return p;
}
p = next;
}
return NULL;
}
/*
* find a class-specified interface descriptor with the given subtype.
*/
void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
{
unsigned char *p = after;
while ((p = snd_usb_find_desc(buffer, buflen, p,
USB_DT_CS_INTERFACE)) != NULL) {
if (p[0] >= 3 && p[2] == dsubtype)
return p;
}
return NULL;
}
/*
* Wrapper for usb_control_msg().
* Allocates a temp buffer to prevent dmaing from/to the stack.
*/
int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
__u8 requesttype, __u16 value, __u16 index, void *data,
__u16 size)
{
int err;
void *buf = NULL;
int timeout;
if (usb_pipe_type_check(dev, pipe))
return -EINVAL;
if (size > 0) {
buf = kmemdup(data, size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
}
if (requesttype & USB_DIR_IN)
timeout = USB_CTRL_GET_TIMEOUT;
else
timeout = USB_CTRL_SET_TIMEOUT;
err = usb_control_msg(dev, pipe, request, requesttype,
value, index, buf, size, timeout);
if (size > 0) {
memcpy(data, buf, size);
kfree(buf);
}
snd_usb_ctl_msg_quirk(dev, pipe, request, requesttype,
value, index, data, size);
return err;
}
unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
struct usb_host_interface *alts)
{
switch (snd_usb_get_speed(chip->dev)) {
case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
case USB_SPEED_SUPER_PLUS:
if (get_endpoint(alts, 0)->bInterval >= 1 &&
get_endpoint(alts, 0)->bInterval <= 4)
return get_endpoint(alts, 0)->bInterval - 1;
break;
default:
break;
}
return 0;
}
struct usb_host_interface *
snd_usb_get_host_interface(struct snd_usb_audio *chip, int ifnum, int altsetting)
{
struct usb_interface *iface;
iface = usb_ifnum_to_if(chip->dev, ifnum);
if (!iface)
return NULL;
return usb_altnum_to_altsetting(iface, altsetting);
}