LXR linux/drivers/nfc/st95hf/spi.h

   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 */
  29struct 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 */
  37enum req_type {
  38        SYNC,
  39        ASYNC,
  40};
  41
  42int st95hf_spi_send(struct st95hf_spi_context *spicontext,
  43                    unsigned char *buffertx,
  44                    int datalen,
  45                    enum req_type reqtype);
  46
  47int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext,
  48                             unsigned char *receivebuff);
  49
  50int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext,
  51                             unsigned char *receivebuff);
  52
  53#endif
  54