sound/usb/helper.h

   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 */