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 #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 26 #define snd_usb_get_speed(dev) ((dev)->speed) 27 28 static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip) 29 { 30 return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber; 31 } 32 33 #endif /* __USBAUDIO_HELPER_H */ 34