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| -rw-r--r-- | lib/libdvben50221/en50221_transport.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/lib/libdvben50221/en50221_transport.h b/lib/libdvben50221/en50221_transport.h new file mode 100644 index 0000000..7882060 --- /dev/null +++ b/lib/libdvben50221/en50221_transport.h @@ -0,0 +1,234 @@ +/* + en50221 encoder An implementation for libdvb + an implementation for the en50221 session layer + + Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com> + Copyright (C) 2005 Julian Scheel (julian at jusst dot de) + Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net) + + This library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of + the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + + +#ifndef __EN50221_TRANSPORT_H__ +#define __EN50221_TRANSPORT_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdlib.h> +#include <stdint.h> +#include <sys/uio.h> + +/** + * Callback reasons. + */ +#define T_CALLBACK_REASON_CONNECTIONOPEN 0x00 // A connection we opened _to_ the cam has been ACKed +#define T_CALLBACK_REASON_CAMCONNECTIONOPEN 0x01 // The cam has opened a connection to _us_. +#define T_CALLBACK_REASON_DATA 0x02 // Data received +#define T_CALLBACK_REASON_CONNECTIONCLOSE 0x03 // The cam has told us to close a connection. +#define T_CALLBACK_REASON_SLOTCLOSE 0x04 // The cam in the supplied slot id has been removed. + +// these are the states a TC can be in +#define T_STATE_IDLE 0x01 // this transport connection is not in use +#define T_STATE_ACTIVE 0x02 // this transport connection is in use +#define T_STATE_ACTIVE_DELETEQUEUED 0x04 // this transport connection is about to be deleted +#define T_STATE_IN_CREATION 0x08 // this transport waits for a T_C_T_C_REPLY to become active +#define T_STATE_IN_DELETION 0x10 // this transport waits for T_D_T_C_REPLY to become idle again + +/** + * Opaque type representing a transport layer. + */ +struct en50221_transport_layer; + +/** + * Type definition for callback function - used when events are received from a module. + * + * **IMPORTANT** For all callback reasons except T_CALLBACK_REASON_DATA, an internal lock is held in the + * transport layer. Therefore, to avoid deadlock, you *must not* call back into the transport layer for + * these reasons. + * + * However, for T_CALLBACK_REASON_DATA, the internal lock is not held, so calling back into the transport + * layer is fine in this case. + * + * @param arg Private data. + * @param reason One of the T_CALLBACK_REASON_* values. + * @param data The data. + * @param data_length Length of the data. + * @param slot_id Slot_id the data was received from. + * @param connection_id Connection_id the data was received from. + */ +typedef void (*en50221_tl_callback) (void *arg, int reason, + uint8_t * data, + uint32_t data_length, + uint8_t slot_id, + uint8_t connection_id); + + +/** + * Construct a new instance of the transport layer. + * + * @param max_slots Maximum number of slots to support. + * @param max_connections_per_slot Maximum connections per slot. + * @return The en50221_transport_layer instance, or NULL on error. + */ +extern struct en50221_transport_layer *en50221_tl_create(uint8_t max_slots, + uint8_t max_connections_per_slot); + +/** + * Destroy an instance of the transport layer. + * + * @param tl The en50221_transport_layer instance. + */ +extern void en50221_tl_destroy(struct en50221_transport_layer *tl); + +/** + * Register a new slot with the library. + * + * @param tl The en50221_transport_layer instance. + * @param ca_hndl FD for talking to the slot. + * @param slot CAM slot where the requested CAM of the CA is in. + * @param response_timeout Maximum timeout in ms to a response we send before signalling a timeout. + * @param poll_delay Interval between polls in ms. + * @return slot_id on sucess, or -1 on error. + */ +extern int en50221_tl_register_slot(struct en50221_transport_layer *tl, + int ca_hndl, uint8_t slot, + uint32_t response_timeout, + uint32_t poll_delay); + +/** + * Destroy a registered slot - e.g. if a CAM is removed, or an error occurs. Does + * not attempt to reset the CAM. + * + * @param tl The en50221_transport_layer instance. + * @param slot_id Slot to destroy. + */ +extern void en50221_tl_destroy_slot(struct en50221_transport_layer *tl, uint8_t slot_id); + +/** + * Performs one iteration of the transport layer poll - + * checking for incoming data furthermore it will handle + * the timeouts of certain commands like T_DELETE_T_C it + * should be called by the application regularly, generally + * faster than the poll delay. + * + * @param tl The en50221_transport_layer instance. + * @return 0 on succes, or -1 if there was an error of some sort. + */ +extern int en50221_tl_poll(struct en50221_transport_layer *tl); + +/** + * Register the callback for data reception. + * + * @param tl The en50221_transport_layer instance. + * @param callback The callback. Set to NULL to remove the callback completely. + * @param arg Private data passed as arg0 of the callback. + */ +extern void en50221_tl_register_callback(struct en50221_transport_layer *tl, + en50221_tl_callback callback, void *arg); + +/** + * Gets the ID of the slot an error occurred on. + * + * @param tl The en50221_transport_layer instance. + * @return The offending slot id. + */ +extern int en50221_tl_get_error_slot(struct en50221_transport_layer *tl); + +/** + * Gets the last error. + * + * @param tl The en50221_transport_layer instance. + * @return One of the EN50221ERR_* values. + */ +extern int en50221_tl_get_error(struct en50221_transport_layer *tl); + +/** + * This function is used to take a data-block, pack into + * into a TPDU (DATA_LAST) and send it to the device + * + * @param tl The en50221_transport_layer instance. + * @param slot_id ID of the slot. + * @param connection_id Connection id. + * @param data Data to send. + * @param data_length Number of bytes to send. + * @return 0 on success, or -1 on error. + */ +extern int en50221_tl_send_data(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id, + uint8_t * data, + uint32_t data_length); + +/** + * This function is used to take a data-block, pack into + * into a TPDU (DATA_LAST) and send it to the device + * + * @param tl The en50221_transport_layer instance. + * @param slot_id ID of the slot. + * @param connection_id Connection id. + * @param vector iov to send. + * @param io_count Number of elements in vector. + * @return 0 on success, or -1 on error. + */ +extern int en50221_tl_send_datav(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + struct iovec *vector, int iov_count); + +/** + * Create a new transport connection to the cam. + * + * **IMPORTANT** When this function returns, it means the request to create a connection + * has been submitted. You will need to poll using en50221_tl_get_connection_state() to find out + * if/when the connection is established. A callback with T_CALLBACK_REASON_CONNECTIONOPEN reason + * will also be sent when it is acked by the CAM. + * + * @param tl The en50221_transport_layer instance. + * @param slot_id ID of the slot. + * @return The allocated connection id on success, or -1 on error. + */ +extern int en50221_tl_new_tc(struct en50221_transport_layer *tl, uint8_t slot_id); + +/** + * Deallocates a transport connection. + * + * **IMPORTANT** When this function returns, it means the request to destroy a connection + * has been submitted. You will need to poll using en50221_tl_get_connection_state() to find out + * if/when the connection is destroyed. + * + * @param tl The en50221_transport_layer instance. + * @param slot_id ID of the slot. + * @param connection_id Connection id to send the request _on_. + * @return 0 on success, or -1 on error. + */ +extern int en50221_tl_del_tc(struct en50221_transport_layer *tl, uint8_t slot_id, uint8_t connection_id); + +/** + * Checks the state of a connection. + * + * @param tl The en50221_transport_layer instance. + * @param slot_id ID of the slot. + * @param connection_id Connection id to send the request _on_. + * @return One of the T_STATE_* values. + */ +extern int en50221_tl_get_connection_state(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id); + +#ifdef __cplusplus +} +#endif +#endif |