linux/sound/usb/helper.h
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   1#ifndef __USBAUDIO_HELPER_H
   2#define __USBAUDIO_HELPER_H
   3
   4unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size);
   5
   6void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype);
   7void *snd_usb_find_csint_desc(void *descstart, int desclen, void *after, u8 dsubtype);
   8
   9int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe,
  10                    __u8 request, __u8 requesttype, __u16 value, __u16 index,
  11                    void *data, __u16 size);
  12
  13unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
  14                                         struct usb_host_interface *alts);
  15
  16/*
  17 * retrieve usb_interface descriptor from the host interface
  18 * (conditional for compatibility with the older API)
  19 */
  20#ifndef get_iface_desc
  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#endif
  26
  27#ifndef snd_usb_get_speed
  28#define snd_usb_get_speed(dev) ((dev)->speed)
  29#endif
  30
  31static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip)
  32{
  33        return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber;
  34}
  35
  36#endif /* __USBAUDIO_HELPER_H */
  37
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