buttons.cxx

// dawn/src/io/buttons.cxx
//
// SPDX-License-Identifier: Apache-2.0
//
 
#include "dawn/porting/buttons.hxx"
 
#include "dawn/io/buttons.hxx"
 
using namespace dawn;
 
int CIOButtons::configureDesc(const CDescObject &desc)
{
  const SObjectCfg::SObjectCfgItem *item;
  size_t offset = 0;
 
  for (size_t i = 0; i < desc.getSize(); i++)
    {
      item = desc.objectCfgItemAtOffset(offset);
 
      if (item->cfgid.s.cls != CIOCommon::IO_CLASS_ANY)
        {
          DAWNERR("unsupported buttons cfg 0x08%" PRIx32 "\n", item->cfgid.v);
          return -EINVAL;
        }
 
      offset += cfgCmnOffset(item);
    }
 
  return OK;
}
 
CIOButtons::~CIOButtons()
{
  deinit();
}
 
int CIOButtons::configure()
{
  int ret;
 
  // Configure object
 
  ret = configureDesc(getDesc());
  if (ret != OK)
    {
      return ret;
    }
 
  // Get path to BUTTONS
 
  if (getCmnDevno() == -1)
    {
      DAWNERR("BUTTONS device number not configured\n");
      return -EINVAL;
    }
 
  snprintf(path, sizeof(path), BUTTONS_PATH_FMT, getCmnDevno());
 
  // Open file
 
  fd = buttons_open(path);
  if (fd < 0)
    {
      DAWNERR("buttons_open failed %d\n", -errno);
      return -errno;
    }
 
  return OK;
}
 
int CIOButtons::deinit()
{
  // Close file
 
  buttons_close(fd);
  return OK;
}
 
int CIOButtons::getDataImpl(IODataCmn &data, size_t len)
{
  uint32_t *tmp = static_cast<uint32_t *>(data.getDataPtr());
  uint32_t val;
  int ret;
 
  // No batch supported
 
  if (len != 1)
    {
      return -ENOTSUP;
    }
 
  // Read input
 
  ret = buttons_read(fd, &val);
  if (ret < 0)
    {
      DAWNERR("buttons_read failed %d\n", ret);
      return ret;
    }
 
  if (isTimestamp())
    {
      data.getTs() = getTimestamp();
    }
 
  *tmp = (uint32_t)val;
 
  return OK;
}
 
#ifdef CONFIG_DAWN_IO_NOTIFY
int CIOButtons::getFd() const
{
  return fd;
}
#endif
 
size_t CIOButtons::getDataSize() const
{
  return sizeof(uint32_t);
}
 
size_t CIOButtons::getDataDim() const
{
  return 1;
}