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 int snd_usb_add_ctrl_interface_link(struct snd_usb_audio *chip, int ifnum,
  21                 int ctrlif);
  22
  23 struct usb_host_interface *snd_usb_find_ctrl_interface(struct snd_usb_audio *chip,
  24                                                                 int ifnum);
  25
  26 /*
  27  * retrieve usb_interface descriptor from the host interface
  28  * (conditional for compatibility with the older API)
  29  */
  30 #define get_iface_desc(iface)   (&(iface)->desc)
  31 #define get_endpoint(alt,ep)    (&(alt)->endpoint[ep].desc)
  32 #define get_ep_desc(ep)         (&(ep)->desc)
  33 #define get_cfg_desc(cfg)       (&(cfg)->desc)
  34
  35 #define snd_usb_get_speed(dev) ((dev)->speed)
  36
  37 static inline int snd_usb_ctrl_intf(struct usb_host_interface *ctrl_intf)
  38 {
  39         return get_iface_desc(ctrl_intf)->bInterfaceNumber;
  40 }
  41
  42 /* in validate.c */
  43 bool snd_usb_validate_audio_desc(void *p, int protocol);
  44 bool snd_usb_validate_midi_desc(void *p);
  45
  46 #endif /* __USBAUDIO_HELPER_H */