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 | */ |
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 |
54 | |