Commit 9b8a11e8 authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Andy Gross

soc: qcom: Introduce QMI encoder/decoder

Add the helper library for encoding and decoding QMI encoded messages.
The implementation is taken from lib/qmi_encdec.c of the Qualcomm kernel
(msm-3.18).

Modifications has been made to the public API, source buffers has been
made const and the debug-logging part was omitted, for now.
Acked-by: 's avatarChris Lew <clew@codeaurora.org>
Tested-by: 's avatarChris Lew <clew@codeaurora.org>
Tested-by: 's avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: 's avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: 's avatarAndy Gross <andy.gross@linaro.org>
parent 29ff62f7
......@@ -35,6 +35,15 @@ config QCOM_PM
modes. It interface with various system drivers to put the cores in
low power modes.
config QCOM_QMI_HELPERS
tristate
depends on ARCH_QCOM
help
Helper library for handling QMI encoded messages. QMI encoded
messages are used in communication between the majority of QRTR
clients and this helpers provide the common functionality needed for
doing this from a kernel driver.
config QCOM_RMTFS_MEM
tristate "Qualcomm Remote Filesystem memory driver"
depends on ARCH_QCOM
......
......@@ -3,6 +3,8 @@ obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
obj-$(CONFIG_QCOM_PM) += spm.o
obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o
qmi_helpers-y += qmi_encdec.o
obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o
obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
obj-$(CONFIG_QCOM_SMEM) += smem.o
......
This diff is collapsed.
// 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/types.h>
/**
* 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;
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_INCOMPATIBLE_STATE_V01 90
#define QMI_ERR_NOT_SUPPORTED_V01 94
/**
* 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 struct qmi_elem_info qmi_response_type_v01_ei[];
void *qmi_encode_message(int type, unsigned int msg_id, size_t *len,
unsigned int txn_id, struct qmi_elem_info *ei,
const void *c_struct);
int qmi_decode_message(const void *buf, size_t len,
struct qmi_elem_info *ei, void *c_struct);
#endif
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