linux/drivers/nfc/st95hf/spi.c
Thomas Gleixner 46fe777164 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 399
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 33 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531081038.745679586@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:12 +02:00

157 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* ----------------------------------------------------------------------------
* drivers/nfc/st95hf/spi.c function definitions for SPI communication
* ----------------------------------------------------------------------------
* Copyright (C) 2015 STMicroelectronics Pvt. Ltd. All rights reserved.
*/
#include "spi.h"
/* Function to send user provided buffer to ST95HF through SPI */
int st95hf_spi_send(struct st95hf_spi_context *spicontext,
unsigned char *buffertx,
int datalen,
enum req_type reqtype)
{
struct spi_message m;
int result = 0;
struct spi_device *spidev = spicontext->spidev;
struct spi_transfer tx_transfer = {
.tx_buf = buffertx,
.len = datalen,
};
mutex_lock(&spicontext->spi_lock);
if (reqtype == SYNC) {
spicontext->req_issync = true;
reinit_completion(&spicontext->done);
} else {
spicontext->req_issync = false;
}
spi_message_init(&m);
spi_message_add_tail(&tx_transfer, &m);
result = spi_sync(spidev, &m);
if (result) {
dev_err(&spidev->dev, "error: sending cmd to st95hf using SPI = %d\n",
result);
mutex_unlock(&spicontext->spi_lock);
return result;
}
/* return for asynchronous or no-wait case */
if (reqtype == ASYNC) {
mutex_unlock(&spicontext->spi_lock);
return 0;
}
result = wait_for_completion_timeout(&spicontext->done,
msecs_to_jiffies(1000));
/* check for timeout or success */
if (!result) {
dev_err(&spidev->dev, "error: response not ready timeout\n");
result = -ETIMEDOUT;
} else {
result = 0;
}
mutex_unlock(&spicontext->spi_lock);
return result;
}
EXPORT_SYMBOL_GPL(st95hf_spi_send);
/* Function to Receive command Response */
int st95hf_spi_recv_response(struct st95hf_spi_context *spicontext,
unsigned char *receivebuff)
{
int len = 0;
struct spi_transfer tx_takedata;
struct spi_message m;
struct spi_device *spidev = spicontext->spidev;
unsigned char readdata_cmd = ST95HF_COMMAND_RECEIVE;
struct spi_transfer t[2] = {
{.tx_buf = &readdata_cmd, .len = 1,},
{.rx_buf = receivebuff, .len = 2, .cs_change = 1,},
};
int ret = 0;
memset(&tx_takedata, 0x0, sizeof(struct spi_transfer));
mutex_lock(&spicontext->spi_lock);
/* First spi transfer to know the length of valid data */
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
ret = spi_sync(spidev, &m);
if (ret) {
dev_err(&spidev->dev, "spi_recv_resp, data length error = %d\n",
ret);
mutex_unlock(&spicontext->spi_lock);
return ret;
}
/* As 2 bytes are already read */
len = 2;
/* Support of long frame */
if (receivebuff[0] & 0x60)
len += (((receivebuff[0] & 0x60) >> 5) << 8) | receivebuff[1];
else
len += receivebuff[1];
/* Now make a transfer to read only relevant bytes */
tx_takedata.rx_buf = &receivebuff[2];
tx_takedata.len = len - 2;
spi_message_init(&m);
spi_message_add_tail(&tx_takedata, &m);
ret = spi_sync(spidev, &m);
mutex_unlock(&spicontext->spi_lock);
if (ret) {
dev_err(&spidev->dev, "spi_recv_resp, data read error = %d\n",
ret);
return ret;
}
return len;
}
EXPORT_SYMBOL_GPL(st95hf_spi_recv_response);
int st95hf_spi_recv_echo_res(struct st95hf_spi_context *spicontext,
unsigned char *receivebuff)
{
unsigned char readdata_cmd = ST95HF_COMMAND_RECEIVE;
struct spi_transfer t[2] = {
{.tx_buf = &readdata_cmd, .len = 1,},
{.rx_buf = receivebuff, .len = 1,},
};
struct spi_message m;
struct spi_device *spidev = spicontext->spidev;
int ret = 0;
mutex_lock(&spicontext->spi_lock);
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
ret = spi_sync(spidev, &m);
mutex_unlock(&spicontext->spi_lock);
if (ret)
dev_err(&spidev->dev, "recv_echo_res, data read error = %d\n",
ret);
return ret;
}
EXPORT_SYMBOL_GPL(st95hf_spi_recv_echo_res);