54 строки
1.5 KiB
C
54 строки
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* ---------------------------------------------------------------------------
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* drivers/nfc/st95hf/spi.h functions declarations for SPI communication
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* ---------------------------------------------------------------------------
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* Copyright (C) 2015 STMicroelectronics – All Rights Reserved
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*/
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#ifndef __LINUX_ST95HF_SPI_H
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#define __LINUX_ST95HF_SPI_H
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#include <linux/spi/spi.h>
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/* Basic ST95HF SPI CMDs */
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#define ST95HF_COMMAND_SEND 0x0
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#define ST95HF_COMMAND_RESET 0x1
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#define ST95HF_COMMAND_RECEIVE 0x2
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#define ST95HF_RESET_CMD_LEN 0x1
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/*
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* structure to contain st95hf spi communication specific information.
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* @req_issync: true for synchronous calls.
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* @spidev: st95hf spi device object.
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* @done: completion structure to wait for st95hf response
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* for synchronous calls.
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* @spi_lock: mutex to allow only one spi transfer at a time.
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*/
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struct st95hf_spi_context {
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bool req_issync;
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struct spi_device *spidev;
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struct completion done;
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struct mutex spi_lock;
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};
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/* flag to differentiate synchronous & asynchronous spi request */
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enum req_type {
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SYNC,
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ASYNC,
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};
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int st95hf_spi_send(struct st95hf_spi_context *spicontext,
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unsigned char *buffertx,
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int datalen,
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enum req_type reqtype);
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int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext,
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unsigned char *receivebuff);
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int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext,
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unsigned char *receivebuff);
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#endif
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