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Commit bd77323e authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Chris Lew
Browse files

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.

Change-Id: I522ec59b7c1bc9be970e21e041b79f5bc6bfae94
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Patch-mainline: linux-arm-msm @ 04/08/17, 7:59
Signed-off-by: default avatarChris Lew <clew@codeaurora.org>
parent a584a1ad

drivers/soc/qcom/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -67,6 +67,14 @@ config QCOM_PM 
	  modes. It interface with various system drivers to put the cores in

	  low power modes.



config QCOM_QMI_HELPERS

	bool

	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_SMEM

	tristate "Qualcomm Shared Memory Manager (SMEM)"

	depends on ARCH_QCOM

drivers/soc/qcom/Makefile

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@@ -5,6 +5,8 @@ obj-$(CONFIG_QCOM_LLCC) += llcc-core.o llcc-slice.o 
obj-$(CONFIG_QCOM_SDM855_LLCC) += llcc-sdm855.o

obj-$(CONFIG_QCOM_LLCC_AMON) += llcc-amon.o

obj-$(CONFIG_QCOM_PM)	+=	spm.o

obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o

qmi_helpers-y	+= qmi_encdec.o

obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o

obj-$(CONFIG_QCOM_SMEM) +=	smem.o

obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o

drivers/soc/qcom/qmi_encdec.c

0 → 100644
+812 −0

File added.

Preview size limit exceeded, changes collapsed.

include/linux/soc/qcom/qmi.h

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+116 −0
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/*

 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.

 * Copyright (c) 2017, Linaro Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * 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 General Public License for more details.

 */

#ifndef __QMI_HELPERS_H__

#define __QMI_HELPERS_H__



#include <linux/qrtr.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 {

	uint8_t type;

	uint16_t txn_id;

	uint16_t msg_id;

	uint16_t 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.

 * @is_array:	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;

	uint32_t elem_len;

	uint32_t elem_size;

	enum qmi_array_type is_array;

	uint8_t tlv_type;

	uint32_t 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 {

	u32 result;

	u32 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