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 struct usb_host_interface *
18 snd_usb_get_host_interface(struct snd_usb_audio *chip, int ifnum, int altsetting);
19
20 int snd_usb_add_ctrl_interface_link(struct snd_usb_audio *chip, int ifnum,
21 int ctrlif);
22
23 struct usb_host_interface *snd_usb_find_ctrl_interface(struct snd_usb_audio *chip,
24 int ifnum);
25
26 /*
27 * retrieve usb_interface descriptor from the host interface
28 * (conditional for compatibility with the older API)
29 */
30 #define get_iface_desc(iface) (&(iface)->desc)
31 #define get_endpoint(alt,ep) (&(alt)->endpoint[ep].desc)
32 #define get_ep_desc(ep) (&(ep)->desc)
33 #define get_cfg_desc(cfg) (&(cfg)->desc)
34
35 #define snd_usb_get_speed(dev) ((dev)->speed)
36
snd_usb_ctrl_intf(struct usb_host_interface * ctrl_intf)37 static inline int snd_usb_ctrl_intf(struct usb_host_interface *ctrl_intf)
38 {
39 return get_iface_desc(ctrl_intf)->bInterfaceNumber;
40 }
41
42 /* in validate.c */
43 bool snd_usb_validate_audio_desc(void *p, int protocol);
44 bool snd_usb_validate_midi_desc(void *p);
45
46 #endif /* __USBAUDIO_HELPER_H */
47