| Shikha Singh | cab4733 | 2015-12-22 00:03:30 +0100 | [diff] [blame] | 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 |