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46fe7771 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
cab47333 SS |
2 | /* |
3 | * --------------------------------------------------------------------------- | |
4 | * drivers/nfc/st95hf/spi.h functions declarations for SPI communication | |
5 | * --------------------------------------------------------------------------- | |
6 | * Copyright (C) 2015 STMicroelectronics – All Rights Reserved | |
cab47333 SS |
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 | */ | |
29 | struct 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 */ | |
37 | enum req_type { | |
38 | SYNC, | |
39 | ASYNC, | |
40 | }; | |
41 | ||
42 | int st95hf_spi_send(struct st95hf_spi_context *spicontext, | |
43 | unsigned char *buffertx, | |
44 | int datalen, | |
45 | enum req_type reqtype); | |
46 | ||
47 | int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext, | |
48 | unsigned char *receivebuff); | |
49 | ||
50 | int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext, | |
51 | unsigned char *receivebuff); | |
52 | ||
53 | #endif |