sound/usb/helper.h

   1 #ifndef __USBAUDIO_HELPER_H
   2 #define __USBAUDIO_HELPER_H
   3
   4 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size);
   5
   6 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype);
   7 void *snd_usb_find_csint_desc(void *descstart, int desclen, void *after, u8 dsubtype);
   8
   9 int 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
  13 unsigned 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
  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 #endif /* __USBAUDIO_HELPER_H */