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, int timeout); 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