84e0ca1310
Gregory Nutt is has submitted the SGA Ken Pettit has submitted the ICLA David S. Alessio has submitted the ICLA as a result we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/****************************************************************************
|
|
* apps/system/i2c/i2c_devif.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <stdbool.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/i2c/i2c_master.h>
|
|
|
|
#include "i2ctool.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Device naming */
|
|
|
|
#define DEVNAME_FMT "/dev/i2c%d"
|
|
#define DEVNAME_FMTLEN (8 + 3 + 1)
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static char g_devname[DEVNAME_FMTLEN];
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: i2cdev_path
|
|
****************************************************************************/
|
|
|
|
FAR char *i2cdev_path(int bus)
|
|
{
|
|
snprintf(g_devname, DEVNAME_FMTLEN, DEVNAME_FMT, bus);
|
|
return g_devname;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: i2cdev_exists
|
|
****************************************************************************/
|
|
|
|
bool i2cdev_exists(int bus)
|
|
{
|
|
struct stat buf;
|
|
FAR char *devpath;
|
|
int ret;
|
|
|
|
/* Get the device path */
|
|
|
|
devpath = i2cdev_path(bus);
|
|
|
|
/* Check if something exists at that path */
|
|
|
|
ret = stat(devpath, &buf);
|
|
if (ret >= 0)
|
|
{
|
|
/* Return TRUE only if it is a character driver */
|
|
|
|
if (S_ISCHR(buf.st_mode))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: i2cdev_open
|
|
****************************************************************************/
|
|
|
|
int i2cdev_open(int bus)
|
|
{
|
|
FAR char *devpath;
|
|
|
|
/* Get the device path */
|
|
|
|
devpath = i2cdev_path(bus);
|
|
|
|
/* Open the file for read-only access (we need only IOCTLs) */
|
|
|
|
return open(devpath, O_RDONLY);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: i2cdev_transfer
|
|
****************************************************************************/
|
|
|
|
int i2cdev_transfer(int fd, FAR struct i2c_msg_s *msgv, int msgc)
|
|
{
|
|
struct i2c_transfer_s xfer;
|
|
|
|
/* Set up the IOCTL argument */
|
|
|
|
xfer.msgv = msgv;
|
|
xfer.msgc = msgc;
|
|
|
|
/* Perform the IOCTL */
|
|
|
|
return ioctl(fd, I2CIOC_TRANSFER, (unsigned long)((uintptr_t)&xfer));
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: i2cdev_reset
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_I2C_RESET
|
|
int i2cdev_reset(int fd)
|
|
{
|
|
/* Perform the IOCTL */
|
|
|
|
return ioctl(fd, I2CIOC_RESET, 0);
|
|
}
|
|
#endif
|
|
|