280 lines
8.7 KiB
C
280 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland
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*/
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#ifndef CAIF_LAYER_H_
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#define CAIF_LAYER_H_
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#include <linux/list.h>
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struct cflayer;
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struct cfpkt;
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struct cfpktq;
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struct caif_payload_info;
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struct caif_packet_funcs;
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#define CAIF_LAYER_NAME_SZ 16
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/**
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* caif_assert() - Assert function for CAIF.
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* @assert: expression to evaluate.
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*
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* This function will print a error message and a do WARN_ON if the
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* assertion failes. Normally this will do a stack up at the current location.
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*/
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#define caif_assert(assert) \
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do { \
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if (!(assert)) { \
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pr_err("caif:Assert detected:'%s'\n", #assert); \
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WARN_ON(!(assert)); \
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} \
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} while (0)
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/**
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* enum caif_ctrlcmd - CAIF Stack Control Signaling sent in layer.ctrlcmd().
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*
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* @CAIF_CTRLCMD_FLOW_OFF_IND: Flow Control is OFF, transmit function
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* should stop sending data
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*
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* @CAIF_CTRLCMD_FLOW_ON_IND: Flow Control is ON, transmit function
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* can start sending data
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*
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* @CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: Remote end modem has decided to close
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* down channel
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*
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* @CAIF_CTRLCMD_INIT_RSP: Called initially when the layer below
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* has finished initialization
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*
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* @CAIF_CTRLCMD_DEINIT_RSP: Called when de-initialization is
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* complete
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*
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* @CAIF_CTRLCMD_INIT_FAIL_RSP: Called if initialization fails
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*
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* @_CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND: CAIF Link layer temporarily cannot
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* send more packets.
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* @_CAIF_CTRLCMD_PHYIF_FLOW_ON_IND: Called if CAIF Link layer is able
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* to send packets again.
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* @_CAIF_CTRLCMD_PHYIF_DOWN_IND: Called if CAIF Link layer is going
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* down.
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*
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* These commands are sent upwards in the CAIF stack to the CAIF Client.
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* They are used for signaling originating from the modem or CAIF Link Layer.
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* These are either responses (*_RSP) or events (*_IND).
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*/
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enum caif_ctrlcmd {
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CAIF_CTRLCMD_FLOW_OFF_IND,
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CAIF_CTRLCMD_FLOW_ON_IND,
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CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND,
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CAIF_CTRLCMD_INIT_RSP,
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CAIF_CTRLCMD_DEINIT_RSP,
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CAIF_CTRLCMD_INIT_FAIL_RSP,
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_CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
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_CAIF_CTRLCMD_PHYIF_FLOW_ON_IND,
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_CAIF_CTRLCMD_PHYIF_DOWN_IND,
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};
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/**
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* enum caif_modemcmd - Modem Control Signaling, sent from CAIF Client
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* to the CAIF Link Layer or modem.
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*
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* @CAIF_MODEMCMD_FLOW_ON_REQ: Flow Control is ON, transmit function
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* can start sending data.
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*
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* @CAIF_MODEMCMD_FLOW_OFF_REQ: Flow Control is OFF, transmit function
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* should stop sending data.
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*
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* @_CAIF_MODEMCMD_PHYIF_USEFULL: Notify physical layer that it is in use
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*
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* @_CAIF_MODEMCMD_PHYIF_USELESS: Notify physical layer that it is
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* no longer in use.
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*
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* These are requests sent 'downwards' in the stack.
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* Flow ON, OFF can be indicated to the modem.
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*/
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enum caif_modemcmd {
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CAIF_MODEMCMD_FLOW_ON_REQ = 0,
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CAIF_MODEMCMD_FLOW_OFF_REQ = 1,
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_CAIF_MODEMCMD_PHYIF_USEFULL = 3,
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_CAIF_MODEMCMD_PHYIF_USELESS = 4
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};
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/**
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* enum caif_direction - CAIF Packet Direction.
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* Indicate if a packet is to be sent out or to be received in.
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* @CAIF_DIR_IN: Incoming packet received.
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* @CAIF_DIR_OUT: Outgoing packet to be transmitted.
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*/
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enum caif_direction {
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CAIF_DIR_IN = 0,
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CAIF_DIR_OUT = 1
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};
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/**
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* struct cflayer - CAIF Stack layer.
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* Defines the framework for the CAIF Core Stack.
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* @up: Pointer up to the layer above.
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* @dn: Pointer down to the layer below.
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* @node: List node used when layer participate in a list.
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* @receive: Packet receive function.
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* @transmit: Packet transmit funciton.
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* @ctrlcmd: Used for control signalling upwards in the stack.
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* @modemcmd: Used for control signaling downwards in the stack.
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* @id: The identity of this layer
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* @name: Name of the layer.
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*
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* This structure defines the layered structure in CAIF.
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*
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* It defines CAIF layering structure, used by all CAIF Layers and the
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* layers interfacing CAIF.
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*
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* In order to integrate with CAIF an adaptation layer on top of the CAIF stack
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* and PHY layer below the CAIF stack
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* must be implemented. These layer must follow the design principles below.
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*
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* Principles for layering of protocol layers:
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* - All layers must use this structure. If embedding it, then place this
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* structure first in the layer specific structure.
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*
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* - Each layer should not depend on any others layer's private data.
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*
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* - In order to send data upwards do
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* layer->up->receive(layer->up, packet);
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*
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* - In order to send data downwards do
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* layer->dn->transmit(layer->dn, info, packet);
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*/
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struct cflayer {
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struct cflayer *up;
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struct cflayer *dn;
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struct list_head node;
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/*
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* receive() - Receive Function (non-blocking).
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* Contract: Each layer must implement a receive function passing the
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* CAIF packets upwards in the stack.
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* Packet handling rules:
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* - The CAIF packet (cfpkt) ownership is passed to the
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* called receive function. This means that the
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* packet cannot be accessed after passing it to the
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* above layer using up->receive().
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*
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* - If parsing of the packet fails, the packet must be
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* destroyed and negative error code returned
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* from the function.
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* EXCEPTION: If the framing layer (cffrml) returns
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* -EILSEQ, the packet is not freed.
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*
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* - If parsing succeeds (and above layers return OK) then
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* the function must return a value >= 0.
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*
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* Returns result < 0 indicates an error, 0 or positive value
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* indicates success.
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*
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* @layr: Pointer to the current layer the receive function is
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* implemented for (this pointer).
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* @cfpkt: Pointer to CaifPacket to be handled.
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*/
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int (*receive)(struct cflayer *layr, struct cfpkt *cfpkt);
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/*
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* transmit() - Transmit Function (non-blocking).
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* Contract: Each layer must implement a transmit function passing the
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* CAIF packet downwards in the stack.
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* Packet handling rules:
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* - The CAIF packet (cfpkt) ownership is passed to the
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* transmit function. This means that the packet
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* cannot be accessed after passing it to the below
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* layer using dn->transmit().
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*
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* - Upon error the packet ownership is still passed on,
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* so the packet shall be freed where error is detected.
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* Callers of the transmit function shall not free packets,
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* but errors shall be returned.
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*
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* - Return value less than zero means error, zero or
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* greater than zero means OK.
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*
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* Returns result < 0 indicates an error, 0 or positive value
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* indicates success.
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*
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* @layr: Pointer to the current layer the receive function
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* isimplemented for (this pointer).
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* @cfpkt: Pointer to CaifPacket to be handled.
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*/
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int (*transmit) (struct cflayer *layr, struct cfpkt *cfpkt);
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/*
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* cttrlcmd() - Control Function upwards in CAIF Stack (non-blocking).
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* Used for signaling responses (CAIF_CTRLCMD_*_RSP)
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* and asynchronous events from the modem (CAIF_CTRLCMD_*_IND)
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*
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* @layr: Pointer to the current layer the receive function
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* is implemented for (this pointer).
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* @ctrl: Control Command.
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*/
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void (*ctrlcmd) (struct cflayer *layr, enum caif_ctrlcmd ctrl,
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int phyid);
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/*
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* modemctrl() - Control Function used for controlling the modem.
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* Used to signal down-wards in the CAIF stack.
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* Returns 0 on success, < 0 upon failure.
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*
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* @layr: Pointer to the current layer the receive function
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* is implemented for (this pointer).
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* @ctrl: Control Command.
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*/
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int (*modemcmd) (struct cflayer *layr, enum caif_modemcmd ctrl);
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unsigned int id;
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char name[CAIF_LAYER_NAME_SZ];
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};
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/**
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* layer_set_up() - Set the up pointer for a specified layer.
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* @layr: Layer where up pointer shall be set.
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* @above: Layer above.
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*/
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#define layer_set_up(layr, above) ((layr)->up = (struct cflayer *)(above))
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/**
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* layer_set_dn() - Set the down pointer for a specified layer.
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* @layr: Layer where down pointer shall be set.
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* @below: Layer below.
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*/
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#define layer_set_dn(layr, below) ((layr)->dn = (struct cflayer *)(below))
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/**
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* struct dev_info - Physical Device info information about physical layer.
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* @dev: Pointer to native physical device.
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* @id: Physical ID of the physical connection used by the
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* logical CAIF connection. Used by service layers to
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* identify their physical id to Caif MUX (CFMUXL)so
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* that the MUX can add the correct physical ID to the
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* packet.
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*/
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struct dev_info {
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void *dev;
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unsigned int id;
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};
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/**
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* struct caif_payload_info - Payload information embedded in packet (sk_buff).
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*
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* @dev_info: Information about the receiving device.
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*
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* @hdr_len: Header length, used to align pay load on 32bit boundary.
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*
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* @channel_id: Channel ID of the logical CAIF connection.
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* Used by mux to insert channel id into the caif packet.
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*/
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struct caif_payload_info {
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struct dev_info *dev_info;
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unsigned short hdr_len;
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unsigned short channel_id;
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};
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#endif /* CAIF_LAYER_H_ */
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