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spi-transfer: Add SPI transfer helper routines

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These routines assume that any messages is composed of a write and/or
read part. While the API allows sending and receiving as part of one
messages/transfer, it does not permit full duplex operation where data is
both send and received at the same time.
This commit is contained in:
Benjamin Berg
2021-01-18 16:41:01 +01:00
committed by Benjamin Berg
parent b0d9d00762
commit 7fcce7891a
6 changed files with 612 additions and 0 deletions
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53
libfprint/fpi-ssm.c
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@@ -737,3 +737,56 @@ fpi_ssm_usb_transfer_with_weak_pointer_cb (FpiUsbTransfer *transfer,
fpi_ssm_usb_transfer_cb (transfer, device, weak_ptr, error);
}
/**
* fpi_ssm_spi_transfer_cb:
* @transfer: a #FpiSpiTransfer
* @device: a #FpDevice
* @unused_data: User data (unused)
* @error: The #GError or %NULL
*
* Can be used in as a #FpiSpiTransfer callback handler to automatically
* advance or fail a statemachine on transfer completion.
*
* Make sure to set the #FpiSsm on the transfer.
*/
void
fpi_ssm_spi_transfer_cb (FpiSpiTransfer *transfer, FpDevice *device,
gpointer unused_data, GError *error)
{
g_return_if_fail (transfer->ssm);
if (error)
fpi_ssm_mark_failed (transfer->ssm, error);
else
fpi_ssm_next_state (transfer->ssm);
}
/**
* fpi_ssm_spi_transfer_with_weak_pointer_cb:
* @transfer: a #FpiSpiTransfer
* @device: a #FpDevice
* @weak_ptr: A #gpointer pointer to nullify. You can pass a pointer to any
* #gpointer to nullify when the callback is completed. I.e a
* pointer to the current #FpiSpiTransfer.
* @error: The #GError or %NULL
*
* Can be used in as a #FpiSpiTransfer callback handler to automatically
* advance or fail a statemachine on transfer completion.
* Passing a #gpointer* as @weak_ptr permits to nullify it once we're done
* with the transfer.
*
* Make sure to set the #FpiSsm on the transfer.
*/
void
fpi_ssm_spi_transfer_with_weak_pointer_cb (FpiSpiTransfer *transfer,
FpDevice *device, gpointer weak_ptr,
GError *error)
{
g_return_if_fail (transfer->ssm);
if (weak_ptr)
g_nullify_pointer ((gpointer *) weak_ptr);
fpi_ssm_spi_transfer_cb (transfer, device, weak_ptr, error);
}