drivers/nfc/st95hf/spi.h

   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