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cab47333 SS |
1 | /* |
2 | * --------------------------------------------------------------------------- | |
3 | * drivers/nfc/st95hf/spi.h functions declarations for SPI communication | |
4 | * --------------------------------------------------------------------------- | |
5 | * Copyright (C) 2015 STMicroelectronics – All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #ifndef __LINUX_ST95HF_SPI_H | |
21 | #define __LINUX_ST95HF_SPI_H | |
22 | ||
23 | #include <linux/spi/spi.h> | |
24 | ||
25 | /* Basic ST95HF SPI CMDs */ | |
26 | #define ST95HF_COMMAND_SEND 0x0 | |
27 | #define ST95HF_COMMAND_RESET 0x1 | |
28 | #define ST95HF_COMMAND_RECEIVE 0x2 | |
29 | ||
30 | #define ST95HF_RESET_CMD_LEN 0x1 | |
31 | ||
32 | /* | |
33 | * structure to contain st95hf spi communication specific information. | |
34 | * @req_issync: true for synchronous calls. | |
35 | * @spidev: st95hf spi device object. | |
36 | * @done: completion structure to wait for st95hf response | |
37 | * for synchronous calls. | |
38 | * @spi_lock: mutex to allow only one spi transfer at a time. | |
39 | */ | |
40 | struct st95hf_spi_context { | |
41 | bool req_issync; | |
42 | struct spi_device *spidev; | |
43 | struct completion done; | |
44 | struct mutex spi_lock; | |
45 | }; | |
46 | ||
47 | /* flag to differentiate synchronous & asynchronous spi request */ | |
48 | enum req_type { | |
49 | SYNC, | |
50 | ASYNC, | |
51 | }; | |
52 | ||
53 | int st95hf_spi_send(struct st95hf_spi_context *spicontext, | |
54 | unsigned char *buffertx, | |
55 | int datalen, | |
56 | enum req_type reqtype); | |
57 | ||
58 | int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext, | |
59 | unsigned char *receivebuff); | |
60 | ||
61 | int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext, | |
62 | unsigned char *receivebuff); | |
63 | ||
64 | #endif |