272 lines
7.7 KiB
C
272 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
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* Copyright (c) 2017, Linaro Ltd.
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*/
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#ifndef __QMI_HELPERS_H__
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#define __QMI_HELPERS_H__
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#include <linux/completion.h>
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#include <linux/idr.h>
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#include <linux/list.h>
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#include <linux/qrtr.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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struct socket;
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/**
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* qmi_header - wireformat header of QMI messages
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* @type: type of message
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* @txn_id: transaction id
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* @msg_id: message id
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* @msg_len: length of message payload following header
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*/
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struct qmi_header {
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u8 type;
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u16 txn_id;
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u16 msg_id;
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u16 msg_len;
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} __packed;
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#define QMI_REQUEST 0
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#define QMI_RESPONSE 2
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#define QMI_INDICATION 4
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#define QMI_COMMON_TLV_TYPE 0
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enum qmi_elem_type {
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QMI_EOTI,
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QMI_OPT_FLAG,
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QMI_DATA_LEN,
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QMI_UNSIGNED_1_BYTE,
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QMI_UNSIGNED_2_BYTE,
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QMI_UNSIGNED_4_BYTE,
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QMI_UNSIGNED_8_BYTE,
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QMI_SIGNED_2_BYTE_ENUM,
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QMI_SIGNED_4_BYTE_ENUM,
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QMI_STRUCT,
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QMI_STRING,
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};
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enum qmi_array_type {
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NO_ARRAY,
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STATIC_ARRAY,
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VAR_LEN_ARRAY,
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};
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/**
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* struct qmi_elem_info - describes how to encode a single QMI element
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* @data_type: Data type of this element.
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* @elem_len: Array length of this element, if an array.
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* @elem_size: Size of a single instance of this data type.
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* @array_type: Array type of this element.
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* @tlv_type: QMI message specific type to identify which element
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* is present in an incoming message.
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* @offset: Specifies the offset of the first instance of this
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* element in the data structure.
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* @ei_array: Null-terminated array of @qmi_elem_info to describe nested
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* structures.
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*/
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struct qmi_elem_info {
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enum qmi_elem_type data_type;
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u32 elem_len;
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u32 elem_size;
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enum qmi_array_type array_type;
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u8 tlv_type;
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u32 offset;
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struct qmi_elem_info *ei_array;
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};
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#define QMI_RESULT_SUCCESS_V01 0
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#define QMI_RESULT_FAILURE_V01 1
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#define QMI_ERR_NONE_V01 0
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#define QMI_ERR_MALFORMED_MSG_V01 1
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#define QMI_ERR_NO_MEMORY_V01 2
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#define QMI_ERR_INTERNAL_V01 3
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#define QMI_ERR_CLIENT_IDS_EXHAUSTED_V01 5
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#define QMI_ERR_INVALID_ID_V01 41
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#define QMI_ERR_ENCODING_V01 58
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#define QMI_ERR_INCOMPATIBLE_STATE_V01 90
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#define QMI_ERR_NOT_SUPPORTED_V01 94
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/**
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* qmi_response_type_v01 - common response header (decoded)
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* @result: result of the transaction
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* @error: error value, when @result is QMI_RESULT_FAILURE_V01
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*/
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struct qmi_response_type_v01 {
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u16 result;
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u16 error;
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};
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extern struct qmi_elem_info qmi_response_type_v01_ei[];
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/**
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* struct qmi_service - context to track lookup-results
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* @service: service type
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* @version: version of the @service
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* @instance: instance id of the @service
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* @node: node of the service
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* @port: port of the service
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* @priv: handle for client's use
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* @list_node: list_head for house keeping
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*/
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struct qmi_service {
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unsigned int service;
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unsigned int version;
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unsigned int instance;
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unsigned int node;
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unsigned int port;
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void *priv;
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struct list_head list_node;
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};
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struct qmi_handle;
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/**
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* struct qmi_ops - callbacks for qmi_handle
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* @new_server: inform client of a new_server lookup-result, returning
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* successfully from this call causes the library to call
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* @del_server as the service is removed from the
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* lookup-result. @priv of the qmi_service can be used by
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* the client
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* @del_server: inform client of a del_server lookup-result
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* @net_reset: inform client that the name service was restarted and
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* that and any state needs to be released
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* @msg_handler: invoked for incoming messages, allows a client to
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* override the usual QMI message handler
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* @bye: inform a client that all clients from a node are gone
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* @del_client: inform a client that a particular client is gone
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*/
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struct qmi_ops {
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int (*new_server)(struct qmi_handle *qmi, struct qmi_service *svc);
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void (*del_server)(struct qmi_handle *qmi, struct qmi_service *svc);
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void (*net_reset)(struct qmi_handle *qmi);
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void (*msg_handler)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
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const void *data, size_t count);
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void (*bye)(struct qmi_handle *qmi, unsigned int node);
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void (*del_client)(struct qmi_handle *qmi,
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unsigned int node, unsigned int port);
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};
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/**
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* struct qmi_txn - transaction context
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* @qmi: QMI handle this transaction is associated with
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* @id: transaction id
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* @lock: for synchronization between handler and waiter of messages
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* @completion: completion object as the transaction receives a response
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* @result: result code for the completed transaction
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* @ei: description of the QMI encoded response (optional)
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* @dest: destination buffer to decode message into (optional)
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*/
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struct qmi_txn {
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struct qmi_handle *qmi;
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u16 id;
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struct mutex lock;
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struct completion completion;
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int result;
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struct qmi_elem_info *ei;
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void *dest;
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};
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/**
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* struct qmi_msg_handler - description of QMI message handler
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* @type: type of message
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* @msg_id: message id
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* @ei: description of the QMI encoded message
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* @decoded_size: size of the decoded object
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* @fn: function to invoke as the message is decoded
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*/
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struct qmi_msg_handler {
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unsigned int type;
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unsigned int msg_id;
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struct qmi_elem_info *ei;
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size_t decoded_size;
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void (*fn)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
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struct qmi_txn *txn, const void *decoded);
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};
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/**
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* struct qmi_handle - QMI context
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* @sock: socket handle
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* @sock_lock: synchronization of @sock modifications
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* @sq: sockaddr of @sock
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* @work: work for handling incoming messages
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* @wq: workqueue to post @work on
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* @recv_buf: scratch buffer for handling incoming messages
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* @recv_buf_size: size of @recv_buf
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* @lookups: list of registered lookup requests
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* @lookup_results: list of lookup-results advertised to the client
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* @services: list of registered services (by this client)
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* @ops: reference to callbacks
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* @txns: outstanding transactions
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* @txn_lock: lock for modifications of @txns
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* @handlers: list of handlers for incoming messages
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*/
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struct qmi_handle {
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struct socket *sock;
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struct mutex sock_lock;
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struct sockaddr_qrtr sq;
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struct work_struct work;
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struct workqueue_struct *wq;
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void *recv_buf;
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size_t recv_buf_size;
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struct list_head lookups;
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struct list_head lookup_results;
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struct list_head services;
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struct qmi_ops ops;
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struct idr txns;
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struct mutex txn_lock;
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const struct qmi_msg_handler *handlers;
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};
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int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
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unsigned int version, unsigned int instance);
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int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
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unsigned int version, unsigned int instance);
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int qmi_handle_init(struct qmi_handle *qmi, size_t max_msg_len,
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const struct qmi_ops *ops,
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const struct qmi_msg_handler *handlers);
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void qmi_handle_release(struct qmi_handle *qmi);
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ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
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struct qmi_txn *txn, int msg_id, size_t len,
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struct qmi_elem_info *ei, const void *c_struct);
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ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
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struct qmi_txn *txn, int msg_id, size_t len,
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struct qmi_elem_info *ei, const void *c_struct);
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ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
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int msg_id, size_t len, struct qmi_elem_info *ei,
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const void *c_struct);
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void *qmi_encode_message(int type, unsigned int msg_id, size_t *len,
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unsigned int txn_id, struct qmi_elem_info *ei,
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const void *c_struct);
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int qmi_decode_message(const void *buf, size_t len,
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struct qmi_elem_info *ei, void *c_struct);
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int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
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struct qmi_elem_info *ei, void *c_struct);
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int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout);
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void qmi_txn_cancel(struct qmi_txn *txn);
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#endif
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