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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2017, Linaro Ltd.
*/
#ifndef __QMI_HELPERS_H__
#define __QMI_HELPERS_H__
#include <linux/completion.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/qrtr.h>
#include <linux/types.h>
#include <linux/workqueue.h>
struct socket;
/**
* struct qmi_header - wireformat header of QMI messages
* @type: type of message
* @txn_id: transaction id
* @msg_id: message id
* @msg_len: length of message payload following header
*/
struct qmi_header {
u8 type;
u16 txn_id;
u16 msg_id;
u16 msg_len;
} __packed;
#define QMI_REQUEST 0
#define QMI_RESPONSE 2
#define QMI_INDICATION 4
#define QMI_COMMON_TLV_TYPE 0
enum qmi_elem_type {
QMI_EOTI,
QMI_OPT_FLAG,
QMI_DATA_LEN,
QMI_UNSIGNED_1_BYTE,
QMI_UNSIGNED_2_BYTE,
QMI_UNSIGNED_4_BYTE,
QMI_UNSIGNED_8_BYTE,
QMI_SIGNED_2_BYTE_ENUM,
QMI_SIGNED_4_BYTE_ENUM,
QMI_STRUCT,
QMI_STRING,
};
enum qmi_array_type {
NO_ARRAY,
STATIC_ARRAY,
VAR_LEN_ARRAY,
};
/**
* struct qmi_elem_info - describes how to encode a single QMI element
* @data_type: Data type of this element.
* @elem_len: Array length of this element, if an array.
* @elem_size: Size of a single instance of this data type.
* @array_type: Array type of this element.
* @tlv_type: QMI message specific type to identify which element
* is present in an incoming message.
* @offset: Specifies the offset of the first instance of this
* element in the data structure.
* @ei_array: Null-terminated array of @qmi_elem_info to describe nested
* structures.
*/
struct qmi_elem_info {
enum qmi_elem_type data_type;
u32 elem_len;
u32 elem_size;
enum qmi_array_type array_type;
u8 tlv_type;
u32 offset;
const struct qmi_elem_info *ei_array;
};
#define QMI_RESULT_SUCCESS_V01 0
#define QMI_RESULT_FAILURE_V01 1
#define QMI_ERR_NONE_V01 0
#define QMI_ERR_MALFORMED_MSG_V01 1
#define QMI_ERR_NO_MEMORY_V01 2
#define QMI_ERR_INTERNAL_V01 3
#define QMI_ERR_CLIENT_IDS_EXHAUSTED_V01 5
#define QMI_ERR_INVALID_ID_V01 41
#define QMI_ERR_ENCODING_V01 58
#define QMI_ERR_DISABLED_V01 69
#define QMI_ERR_INCOMPATIBLE_STATE_V01 90
#define QMI_ERR_NOT_SUPPORTED_V01 94
/**
* struct qmi_response_type_v01 - common response header (decoded)
* @result: result of the transaction
* @error: error value, when @result is QMI_RESULT_FAILURE_V01
*/
struct qmi_response_type_v01 {
u16 result;
u16 error;
};
extern const struct qmi_elem_info qmi_response_type_v01_ei[];
/**
* struct qmi_service - context to track lookup-results
* @service: service type
* @version: version of the @service
* @instance: instance id of the @service
* @node: node of the service
* @port: port of the service
* @priv: handle for client's use
* @list_node: list_head for house keeping
*/
struct qmi_service {
unsigned int service;
unsigned int version;
unsigned int instance;
unsigned int node;
unsigned int port;
void *priv;
struct list_head list_node;
};
struct qmi_handle;
/**
* struct qmi_ops - callbacks for qmi_handle
* @new_server: inform client of a new_server lookup-result, returning
* successfully from this call causes the library to call
* @del_server as the service is removed from the
* lookup-result. @priv of the qmi_service can be used by
* the client
* @del_server: inform client of a del_server lookup-result
* @net_reset: inform client that the name service was restarted and
* that and any state needs to be released
* @msg_handler: invoked for incoming messages, allows a client to
* override the usual QMI message handler
* @bye: inform a client that all clients from a node are gone
* @del_client: inform a client that a particular client is gone
*/
struct qmi_ops {
int (*new_server)(struct qmi_handle *qmi, struct qmi_service *svc);
void (*del_server)(struct qmi_handle *qmi, struct qmi_service *svc);
void (*net_reset)(struct qmi_handle *qmi);
void (*msg_handler)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
const void *data, size_t count);
void (*bye)(struct qmi_handle *qmi, unsigned int node);
void (*del_client)(struct qmi_handle *qmi,
unsigned int node, unsigned int port);
};
/**
* struct qmi_txn - transaction context
* @qmi: QMI handle this transaction is associated with
* @id: transaction id
* @lock: for synchronization between handler and waiter of messages
* @completion: completion object as the transaction receives a response
* @result: result code for the completed transaction
* @ei: description of the QMI encoded response (optional)
* @dest: destination buffer to decode message into (optional)
*/
struct qmi_txn {
struct qmi_handle *qmi;
u16 id;
struct mutex lock;
struct completion completion;
int result;
const struct qmi_elem_info *ei;
void *dest;
};
/**
* struct qmi_msg_handler - description of QMI message handler
* @type: type of message
* @msg_id: message id
* @ei: description of the QMI encoded message
* @decoded_size: size of the decoded object
* @fn: function to invoke as the message is decoded
*/
struct qmi_msg_handler {
unsigned int type;
unsigned int msg_id;
const struct qmi_elem_info *ei;
size_t decoded_size;
void (*fn)(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
struct qmi_txn *txn, const void *decoded);
};
/**
* struct qmi_handle - QMI context
* @sock: socket handle
* @sock_lock: synchronization of @sock modifications
* @sq: sockaddr of @sock
* @work: work for handling incoming messages
* @wq: workqueue to post @work on
* @recv_buf: scratch buffer for handling incoming messages
* @recv_buf_size: size of @recv_buf
* @lookups: list of registered lookup requests
* @lookup_results: list of lookup-results advertised to the client
* @services: list of registered services (by this client)
* @ops: reference to callbacks
* @txns: outstanding transactions
* @txn_lock: lock for modifications of @txns
* @handlers: list of handlers for incoming messages
*/
struct qmi_handle {
struct socket *sock;
struct mutex sock_lock;
struct sockaddr_qrtr sq;
struct work_struct work;
struct workqueue_struct *wq;
void *recv_buf;
size_t recv_buf_size;
struct list_head lookups;
struct list_head lookup_results;
struct list_head services;
struct qmi_ops ops;
struct idr txns;
struct mutex txn_lock;
const struct qmi_msg_handler *handlers;
};
int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
unsigned int version, unsigned int instance);
int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
unsigned int version, unsigned int instance);
int qmi_handle_init(struct qmi_handle *qmi, size_t max_msg_len,
const struct qmi_ops *ops,
const struct qmi_msg_handler *handlers);
void qmi_handle_release(struct qmi_handle *qmi);
ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
struct qmi_txn *txn, int msg_id, size_t len,
const struct qmi_elem_info *ei, const void *c_struct);
ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
struct qmi_txn *txn, int msg_id, size_t len,
const struct qmi_elem_info *ei, const void *c_struct);
ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
int msg_id, size_t len, const struct qmi_elem_info *ei,
const void *c_struct);
void *qmi_encode_message(int type, unsigned int msg_id, size_t *len,
unsigned int txn_id, const struct qmi_elem_info *ei,
const void *c_struct);
int qmi_decode_message(const void *buf, size_t len,
const struct qmi_elem_info *ei, void *c_struct);
int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
const struct qmi_elem_info *ei, void *c_struct);
int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout);
void qmi_txn_cancel(struct qmi_txn *txn);
#endif