linux/sound/usb/clock.h

#ifndef __USBAUDIO_CLOCK_H
#define __USBAUDIO_CLOCK_H

int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
			     struct usb_host_interface *alts,
			     struct audioformat *fmt, int rate);

int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
			     bool validate);

#endif /* __USBAUDIO_CLOCK_H */
ALSA: usb-audio: parse clock topology of UAC2 devices Audio devices which comply to the UAC2 standard can export complex clock topologies in its descriptors and set up links between them. The entities that are defined are - clock sources, which define the end-leafs. - clock selectors, which act as switch to select one out of many possible clocks sources. - clock multipliers, which have an input clock source, and act as clock source again. They can be used to derive one clock from another. All sample rate changes, clock validity queries and the like must go to clock source elements, while clock selectors and multipliers can be used as terminal clock source. The following patch adds a parser for these elements and functions to iterate over the tree and find the leaf nodes (clock sources). The samplerate set functions were moved to the new clock.c file. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> 2010-05-31 12:51:31 +00:00			`#ifndef __USBAUDIO_CLOCK_H`
			`#define __USBAUDIO_CLOCK_H`

			`int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,`
			`struct usb_host_interface *alts,`
			`struct audioformat *fmt, int rate);`

ALSA: usb-audio: UAC2: do clock validity check earlier Move the check that parse_audio_format_rates_v2() do after receiving the clock source entity ID directly into the find function and add a validation flag to the function. This patch does not introduce any logic flow change. It is provided to allow introducing automatic clock switching easier later. By moving this uac_clock_source_is_valid callsite, 2 additional callsites can be avoided. Signed-off-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> 2013-04-03 21:18:54 +00:00			`int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,`
			`bool validate);`
ALSA: usb-audio: parse clock topology of UAC2 devices Audio devices which comply to the UAC2 standard can export complex clock topologies in its descriptors and set up links between them. The entities that are defined are - clock sources, which define the end-leafs. - clock selectors, which act as switch to select one out of many possible clocks sources. - clock multipliers, which have an input clock source, and act as clock source again. They can be used to derive one clock from another. All sample rate changes, clock validity queries and the like must go to clock source elements, while clock selectors and multipliers can be used as terminal clock source. The following patch adds a parser for these elements and functions to iterate over the tree and find the leaf nodes (clock sources). The samplerate set functions were moved to the new clock.c file. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> 2010-05-31 12:51:31 +00:00
			`#endif /* __USBAUDIO_CLOCK_H */`