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