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  */
  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