Release 4.14 drivers/nfc/st95hf/spi.h
/*
* ---------------------------------------------------------------------------
* drivers/nfc/st95hf/spi.h functions declarations for SPI communication
* ---------------------------------------------------------------------------
* Copyright (C) 2015 STMicroelectronics – All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __LINUX_ST95HF_SPI_H
#define __LINUX_ST95HF_SPI_H
#include <linux/spi/spi.h>
/* Basic ST95HF SPI CMDs */
#define ST95HF_COMMAND_SEND 0x0
#define ST95HF_COMMAND_RESET 0x1
#define ST95HF_COMMAND_RECEIVE 0x2
#define ST95HF_RESET_CMD_LEN 0x1
/*
* structure to contain st95hf spi communication specific information.
* @req_issync: true for synchronous calls.
* @spidev: st95hf spi device object.
* @done: completion structure to wait for st95hf response
* for synchronous calls.
* @spi_lock: mutex to allow only one spi transfer at a time.
*/
struct st95hf_spi_context {
bool req_issync;
struct spi_device *spidev;
struct completion done;
struct mutex spi_lock;
};
/* flag to differentiate synchronous & asynchronous spi request */
enum req_type {
SYNC,
ASYNC,
};
int st95hf_spi_send(struct st95hf_spi_context *spicontext,
unsigned char *buffertx,
int datalen,
enum req_type reqtype);
int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext,
unsigned char *receivebuff);
int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext,
unsigned char *receivebuff);
#endif
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