usb_io.c File Reference

#include <string.h>
#include <usb.h>
#include "base.h"
#include "libnjb.h"
#include "ioutil.h"
#include "usb_io.h"
#include "njb_error.h"

Functions
ssize_t	usb_pipe_write (njb_t *njb, void *buf, size_t nbytes)
ssize_t	usb_pipe_read (njb_t *njb, void *buf, size_t nbytes)
int	usb_setup (njb_t *njb, int type, int request, int value, int index, int length, void *data)
Variables
int	__sub_depth

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Detailed Description

This file contain some USB-specific code that is used by all devices.

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Function Documentation

ssize_t usb_pipe_read	(	njb_t *	njb,
		void *	buf,
		size_t	nbytes
	)

This function reads a chunk of bytes to a buffer from a device's IN endpoint.

Parameters:

	njb	the jukebox object to use
	buf	the buffer to store the bytes in
	nbytes	the number of bytes to read in

Returns:

the number of bytes actually read

References data_dump_ascii(), DD_USBBLK, DD_USBBLKLIM, njb_struct::dev, njb_debug(), and njb_struct::usb_bulk_in_ep.

Referenced by njb3_add_multiple_tracks_to_playlist(), njb3_create_playlist(), njb3_get_codecs(), njb3_get_file_block(), njb3_power_status(), njb3_request_file_chunk(), njb_ping(), njb_read_eaxtypes(), and njb_receive_file_block().

ssize_t usb_pipe_write	(	njb_t *	njb,
		void *	buf,
		size_t	nbytes
	)

This function writes a number of bytes from a buffer to a devices OUT endpoint.

Parameters:

	njb	the jukebox object to use
	buf	the buffer to send bytes from
	nbytes	the number of bytes to write

Returns:

the number of bytes actually written

References data_dump_ascii(), DD_USBBLK, DD_USBBLKLIM, njb_struct::dev, njb_debug(), and njb_struct::usb_bulk_out_ep.

int usb_setup	(	njb_t *	njb,
		int	type,
		int	request,
		int	value,
		int	index,
		int	length,
		void *	data
	)

This function sends a USB SETUP 8-byte command across to endpoint 0 on the device.

References __sub_depth, data_dump(), data_dump_ascii(), DD_USBCTL, njb_struct::dev, and njb_debug().

Referenced by njb_capture(), njb_get_datafile_header(), njb_get_disk_usage(), njb_get_library_counter(), njb_get_playlist_header(), njb_get_track_tag_header(), njb_ping(), njb_read_eaxtypes(), njb_receive_file_block(), njb_set_library_counter(), and njb_verify_last_command().

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Variable Documentation

int __sub_depth

The current subroutine depth for all of libnjb (global)

Referenced by usb_setup().