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 /*
  18  * retrieve usb_interface descriptor from the host interface
  19  * (conditional for compatibility with the older API)
  20  */
  21 #ifndef get_iface_desc
  22 #define get_iface_desc(iface)   (&(iface)->desc)
  23 #define get_endpoint(alt,ep)    (&(alt)->endpoint[ep].desc)
  24 #define get_ep_desc(ep)         (&(ep)->desc)
  25 #define get_cfg_desc(cfg)       (&(cfg)->desc)
  26 #endif
  27
  28 #ifndef snd_usb_get_speed
  29 #define snd_usb_get_speed(dev) ((dev)->speed)
  30 #endif
  31
  32 static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip)
  33 {
  34         return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber;
  35 }
  36
  37 #endif /* __USBAUDIO_HELPER_H */