libraw1394/src/raw1394.h

#ifndef _LIBRAW1394_RAW1394_H
#define _LIBRAW1394_RAW1394_H

#include <sys/types.h>
typedef u_int32_t quadlet_t;
typedef u_int64_t octlet_t;
typedef u_int64_t nodeaddr_t;
typedef u_int16_t nodeid_t;


typedef struct raw1394_handle *raw1394handle_t;


#ifdef __cplusplus
extern "C" {
#endif

/*
 * Required as initialization.  One handle can control one port, it is possible
 * to use multiple handles.  raw1394_get_handle returns NULL for failure,
 * raw1394_destroy_handle accepts NULL.  If raw1394_get_handle returns NULL and
 * errno is 0, this version of libraw1394 is incompatible with the kernel.  
 */
raw1394handle_t raw1394_get_handle(void);
void raw1394_destroy_handle(raw1394handle_t handle);

/*
 * Get the fd of this handle to select()/poll() on it.  Don't try to mess around
 * with it any other way.  Valid only after the handle got attached to a port.
 */
int raw1394_get_fd(raw1394handle_t handle);

unsigned int raw1394_get_generation(raw1394handle_t handle);
nodeid_t raw1394_get_local_id(raw1394handle_t handle);

/* Get number of nodes on bus. */
int raw1394_get_nodecount(raw1394handle_t handle);

/*
 * Returns number of available ports (port == one IEEE 1394 card or onboard
 * chip).  A maximum number of maxport raw1394_portinfos will be filled out at
 * *pinf, zero is valid if you're only interested in the number of ports (which
 * is returned).
 */
struct raw1394_portinfo {
        int nodes;
        char name[32];
};

int raw1394_get_port_info(raw1394handle_t handle, struct raw1394_portinfo *pinf,
                          int maxports);

/*
 * Attach handle to port (counted from zero).  Returns zero for success or -1
 * for failure.  If in the case of failure errno is set to ESTALE the generation
 * number has changed and you should reget the port info.
 */
int raw1394_set_port(raw1394handle_t handle, int port);


/*
 * Get one new message through handle and process it.  See below for handler
 * registering functions.  This function will return -1 for an error or the
 * return value of the handler which got executed.  Default handlers always
 * return zero.
 *
 * Note that some other library functions may call this function multiple times
 * to wait for their completion, some handler return values may get lost if you
 * use these.
 */
int raw1394_loop_iterate(raw1394handle_t handle);

/*
 * Set the handler that will be called when a bus reset message is encountered.
 * The default action is to do nothing.  Returns old handler.
 */
typedef int (*bus_reset_handler_t)(raw1394handle_t);
bus_reset_handler_t raw1394_set_bus_reset_handler(raw1394handle_t handle,
                                                  bus_reset_handler_t new);

/*
 * Set the handler that will be called when an async read/write/lock returns.
 * The default action is to call the callback in the raw1394_reqhandle pointed
 * to by tag.  Returns old handler.
 */
typedef int (*tag_handler_t)(raw1394handle_t, unsigned long tag, int errcode);
tag_handler_t raw1394_set_tag_handler(raw1394handle_t handle,
                                      tag_handler_t new);

/*
 * Set the handler that will be called when an iso packet arrives (data points
 * to the iso packet header).  The default action is to do nothing.
 *
 * Handlers have to be set separately for each channel, it is not possible to
 * set a handler when there is already one set for that channel.  Handlers can
 * be cleared by passing NULL for "new" parameter, in that case the old handler
 * will be returned.  Otherwise the return value is NULL for success and -1 for
 * failure.
 */
typedef int (*iso_handler_t)(raw1394handle_t, int channel, size_t length,
                             quadlet_t *data);
iso_handler_t raw1394_set_iso_handler(raw1394handle_t handle,
                                      unsigned int channel, iso_handler_t new);


/*
 * This is the general request handle.  It is used by the default tag handler
 * when a request completes, it calls the callback and passes it the data
 * pointer and the error code of the request.
 */
typedef int (*req_callback_t)(raw1394handle_t, void *data, int errcode);
struct raw1394_reqhandle {
        req_callback_t callback;
        void *data;
};

/*
 * Passes custom tag.  Use pointer to raw1394_reqhandle if you use the standard
 * tag handler.
 */
int raw1394_start_read(raw1394handle_t handle, nodeid_t node, nodeaddr_t addr,
                       size_t length, quadlet_t *buffer, unsigned long tag);
int raw1394_start_write(raw1394handle_t handle, nodeid_t node, nodeaddr_t addr,
                        size_t length, quadlet_t *data, unsigned long tag);

/*
 * This does the complete transaction and will return when it's finished.  It
 * will call raw1394_loop_iterate() as often as necessary, return values of
 * handlers called will be therefore lost.
 */
int raw1394_read(raw1394handle_t handle, nodeid_t node, nodeaddr_t addr,
                 size_t length, quadlet_t *buffer);
int raw1394_write(raw1394handle_t handle, nodeid_t node, nodeaddr_t addr,
                  size_t length, quadlet_t *data);

/*
 * Start and stop receiving a certain isochronous channel.  You have to set an
 * iso handler (see above).  You can receive multiple channels simultaneously.
 */
int raw1394_start_iso_rcv(raw1394handle_t handle, unsigned int channel);
int raw1394_stop_iso_rcv(raw1394handle_t handle, unsigned int channel);

#ifdef __cplusplus
}
#endif

#endif /* _LIBRAW1394_RAW1394_H */