1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * ---------------------------------------------------------------------------
4 * drivers/nfc/st95hf/spi.h functions declarations for SPI communication
5 * ---------------------------------------------------------------------------
6 * Copyright (C) 2015 STMicroelectronics – All Rights Reserved
7 */
8
9#ifndef __LINUX_ST95HF_SPI_H
10#define __LINUX_ST95HF_SPI_H
11
12#include <linux/spi/spi.h>
13
14/* Basic ST95HF SPI CMDs */
15#define ST95HF_COMMAND_SEND 0x0
16#define ST95HF_COMMAND_RESET 0x1
17#define ST95HF_COMMAND_RECEIVE 0x2
18
19#define ST95HF_RESET_CMD_LEN 0x1
20
21/*
22 * structure to contain st95hf spi communication specific information.
23 * @req_issync: true for synchronous calls.
24 * @spidev: st95hf spi device object.
25 * @done: completion structure to wait for st95hf response
26 * for synchronous calls.
27 * @spi_lock: mutex to allow only one spi transfer at a time.
28 */
29struct st95hf_spi_context {
30 bool req_issync;
31 struct spi_device *spidev;
32 struct completion done;
33 struct mutex spi_lock;
34};
35
36/* flag to differentiate synchronous & asynchronous spi request */
37enum req_type {
38 SYNC,
39 ASYNC,
40};
41
42int st95hf_spi_send(struct st95hf_spi_context *spicontext,
43 unsigned char *buffertx,
44 int datalen,
45 enum req_type reqtype);
46
47int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext,
48 unsigned char *receivebuff);
49
50int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext,
51 unsigned char *receivebuff);
52
53#endif
54

source code of linux/drivers/nfc/st95hf/spi.h