xref: /openbmc/linux/sound/usb/helper.h (revision 7effbd18)
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 /*
21  * retrieve usb_interface descriptor from the host interface
22  * (conditional for compatibility with the older API)
23  */
24 #define get_iface_desc(iface)	(&(iface)->desc)
25 #define get_endpoint(alt,ep)	(&(alt)->endpoint[ep].desc)
26 #define get_ep_desc(ep)		(&(ep)->desc)
27 #define get_cfg_desc(cfg)	(&(cfg)->desc)
28 
29 #define snd_usb_get_speed(dev) ((dev)->speed)
30 
31 static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip)
32 {
33 	return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber;
34 }
35 
36 /* in validate.c */
37 bool snd_usb_validate_audio_desc(void *p, int protocol);
38 bool snd_usb_validate_midi_desc(void *p);
39 
40 #endif /* __USBAUDIO_HELPER_H */
41