1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __USBAUDIO_HELPER_H
3 #define __USBAUDIO_HELPER_H
4
5 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size);
6
7 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype);
8 void *snd_usb_find_csint_desc(void *descstart, int desclen, void *after, u8 dsubtype);
9
10 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe,
11 __u8 request, __u8 requesttype, __u16 value, __u16 index,
12 void *data, __u16 size);
13
14 unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
15 struct usb_host_interface *alts);
16
17 /*
18 * retrieve usb_interface descriptor from the host interface
19 * (conditional for compatibility with the older API)
20 */
21 #define get_iface_desc(iface) (&(iface)->desc)
22 #define get_endpoint(alt,ep) (&(alt)->endpoint[ep].desc)
23 #define get_ep_desc(ep) (&(ep)->desc)
24 #define get_cfg_desc(cfg) (&(cfg)->desc)
25
26 #define snd_usb_get_speed(dev) ((dev)->speed)
27
snd_usb_ctrl_intf(struct snd_usb_audio * chip)28 static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip)
29 {
30 return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber;
31 }
32
33 /* in validate.c */
34 bool snd_usb_validate_audio_desc(void *p, int protocol);
35 bool snd_usb_validate_midi_desc(void *p);
36
37 #endif /* __USBAUDIO_HELPER_H */
38