spi-transfer: Add SPI transfer helper routines
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
Benjamin Berg
parent
b0d9d00762
commit
7fcce7891a
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@ -29,4 +29,5 @@
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#include "fpi-log.h"
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#include "fpi-print.h"
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#include "fpi-usb-transfer.h"
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#include "fpi-spi-transfer.h"
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#include "fpi-ssm.h"
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@ -0,0 +1,432 @@
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/*
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* FPrint SPI transfer handling
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* Copyright (C) 2019-2020 Benjamin Berg <bberg@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "fpi-spi-transfer.h"
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#include <sys/ioctl.h>
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#include <linux/spi/spidev.h>
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#include <errno.h>
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/**
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* SECTION:fpi-spi-transfer
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* @title: SPI transfer helpers
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* @short_description: Helpers to ease SPI transfers
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*
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* #FpiSpiTransfer is a structure to simplify the SPI transfer handling
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* for the linux spidev device. The main goal are to ease memory management
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* and provide a usable asynchronous API to libfprint drivers.
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*
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* Currently only transfers with a write and subsequent read are supported.
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*
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* Drivers should always use this API rather than calling read/write/ioctl on
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* the spidev device.
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*
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* Setting G_MESSAGES_DEBUG and FP_DEBUG_TRANSFER will result in the message
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* content to be dumped.
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*/
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G_DEFINE_BOXED_TYPE (FpiSpiTransfer, fpi_spi_transfer, fpi_spi_transfer_ref, fpi_spi_transfer_unref)
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static void
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dump_buffer (guchar *buf, gssize dump_len)
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{
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g_autoptr(GString) line = NULL;
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line = g_string_new ("");
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/* Dump the buffer. */
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for (gssize i = 0; i < dump_len; i++)
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{
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g_string_append_printf (line, "%02x ", buf[i]);
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if ((i + 1) % 16 == 0)
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{
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g_debug ("%s", line->str);
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g_string_set_size (line, 0);
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}
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}
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if (line->len)
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g_debug ("%s", line->str);
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}
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static void
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log_transfer (FpiSpiTransfer *transfer, gboolean submit, GError *error)
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{
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if (g_getenv ("FP_DEBUG_TRANSFER"))
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{
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if (submit)
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{
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g_debug ("Transfer %p submitted, write length %zd, read length %zd",
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transfer,
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transfer->length_wr,
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transfer->length_rd);
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if (transfer->buffer_wr)
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dump_buffer (transfer->buffer_wr, transfer->length_wr);
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}
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else
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{
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g_autofree gchar *error_str = NULL;
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if (error)
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error_str = g_strdup_printf ("with error (%s)", error->message);
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else
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error_str = g_strdup ("successfully");
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g_debug ("Transfer %p completed %s, write length %zd, read length %zd",
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transfer,
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error_str,
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transfer->length_wr,
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transfer->length_rd);
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if (transfer->buffer_rd)
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dump_buffer (transfer->buffer_rd, transfer->length_rd);
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}
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}
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}
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/**
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* fpi_spi_transfer_new:
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* @device: The #FpDevice the transfer is for
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* @spidev_fd: The file descriptor for the spidev device
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*
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* Creates a new #FpiSpiTransfer.
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*
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* Returns: (transfer full): A newly created #FpiSpiTransfer
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*/
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FpiSpiTransfer *
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fpi_spi_transfer_new (FpDevice * device, int spidev_fd)
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{
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FpiSpiTransfer *self;
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g_assert (FP_IS_DEVICE (device));
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self = g_slice_new0 (FpiSpiTransfer);
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self->ref_count = 1;
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/* Purely to enhance the debug log output. */
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self->length_wr = -1;
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self->length_rd = -1;
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self->device = device;
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self->spidev_fd = spidev_fd;
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return self;
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}
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static void
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fpi_spi_transfer_free (FpiSpiTransfer *self)
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{
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g_assert (self);
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g_assert_cmpint (self->ref_count, ==, 0);
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if (self->free_buffer_wr && self->buffer_wr)
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self->free_buffer_wr (self->buffer_wr);
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if (self->free_buffer_rd && self->buffer_rd)
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self->free_buffer_rd (self->buffer_rd);
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self->buffer_wr = NULL;
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self->buffer_rd = NULL;
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g_slice_free (FpiSpiTransfer, self);
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}
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/**
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* fpi_spi_transfer_ref:
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* @self: A #FpiSpiTransfer
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*
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* Increments the reference count of @self by one.
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*
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* Returns: (transfer full): @self
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*/
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FpiSpiTransfer *
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fpi_spi_transfer_ref (FpiSpiTransfer *self)
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{
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g_return_val_if_fail (self, NULL);
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g_return_val_if_fail (self->ref_count, NULL);
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g_atomic_int_inc (&self->ref_count);
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return self;
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}
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/**
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* fpi_spi_transfer_unref:
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* @self: A #FpiSpiTransfer
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*
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* Decrements the reference count of @self by one, freeing the structure when
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* the reference count reaches zero.
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*/
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void
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fpi_spi_transfer_unref (FpiSpiTransfer *self)
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{
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g_return_if_fail (self);
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g_return_if_fail (self->ref_count);
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if (g_atomic_int_dec_and_test (&self->ref_count))
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fpi_spi_transfer_free (self);
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}
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/**
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* fpi_spi_transfer_write:
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* @transfer: The #FpiSpiTransfer
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* @length: The buffer size to allocate
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*
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* Prepare the write part of an SPI transfer allocating a new buffer
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* internally that will be free'ed automatically.
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*/
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void
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fpi_spi_transfer_write (FpiSpiTransfer *transfer,
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gsize length)
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{
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fpi_spi_transfer_write_full (transfer,
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g_malloc0 (length),
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length,
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g_free);
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}
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/**
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* fpi_spi_transfer_write_full:
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* @transfer: The #FpiSpiTransfer
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* @buffer: The data to write.
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* @length: The size of @buffer
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* @free_func: (destroy buffer): Destroy notify for @buffer
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*
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* Prepare the write part of an SPI transfer.
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*/
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void
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fpi_spi_transfer_write_full (FpiSpiTransfer *transfer,
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guint8 *buffer,
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gsize length,
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GDestroyNotify free_func)
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{
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g_assert (buffer != NULL);
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g_return_if_fail (transfer);
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/* Write is always before read, so ensure both are NULL. */
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g_return_if_fail (transfer->buffer_wr == NULL);
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g_return_if_fail (transfer->buffer_rd == NULL);
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transfer->buffer_wr = buffer;
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transfer->length_wr = length;
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transfer->free_buffer_wr = free_func;
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}
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/**
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* fpi_spi_transfer_read:
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* @transfer: The #FpiSpiTransfer
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* @length: The buffer size to allocate
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*
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* Prepare the read part of an SPI transfer allocating a new buffer
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* internally that will be free'ed automatically.
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*/
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void
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fpi_spi_transfer_read (FpiSpiTransfer *transfer,
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gsize length)
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{
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fpi_spi_transfer_read_full (transfer,
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g_malloc0 (length),
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length,
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g_free);
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}
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/**
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* fpi_spi_transfer_read_full:
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* @transfer: The #FpiSpiTransfer
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* @buffer: Buffer to read data into.
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* @length: The size of @buffer
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* @free_func: (destroy buffer): Destroy notify for @buffer
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*
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* Prepare the read part of an SPI transfer.
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*/
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void
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fpi_spi_transfer_read_full (FpiSpiTransfer *transfer,
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guint8 *buffer,
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gsize length,
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GDestroyNotify free_func)
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{
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g_assert (buffer != NULL);
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g_return_if_fail (transfer);
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g_return_if_fail (transfer->buffer_rd == NULL);
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transfer->buffer_rd = buffer;
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transfer->length_rd = length;
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transfer->free_buffer_rd = free_func;
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}
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static void
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transfer_finish_cb (GObject *source_object, GAsyncResult *res, gpointer user_data)
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{
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GTask *task = G_TASK (res);
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FpiSpiTransfer *transfer = g_task_get_task_data (task);
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GError *error = NULL;
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FpiSpiTransferCallback callback;
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g_task_propagate_boolean (task, &error);
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log_transfer (transfer, FALSE, error);
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callback = transfer->callback;
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transfer->callback = NULL;
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callback (transfer, transfer->device, transfer->user_data, error);
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}
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static void
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transfer_thread_func (GTask *task,
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gpointer source_object,
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gpointer task_data,
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GCancellable *cancellable)
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{
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FpiSpiTransfer *transfer = (FpiSpiTransfer *) task_data;
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struct spi_ioc_transfer xfer[2];
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int transfers = 0;
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int status;
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if (transfer->buffer_wr == NULL && transfer->buffer_rd == NULL)
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{
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g_task_return_new_error (task,
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G_IO_ERROR,
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G_IO_ERROR_INVALID_ARGUMENT,
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"Transfer with neither write or read!");
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return;
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}
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memset (xfer, 0, sizeof (xfer));
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if (transfer->buffer_wr)
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{
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xfer[transfers].tx_buf = (guint64) transfer->buffer_wr;
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xfer[transfers].len = transfer->length_wr;
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transfers += 1;
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}
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if (transfer->buffer_rd)
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{
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xfer[transfers].rx_buf = (guint64) transfer->buffer_rd;
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xfer[transfers].len = transfer->length_rd;
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transfers += 1;
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}
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/* This ioctl cannot be interrupted. */
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status = ioctl (transfer->spidev_fd, SPI_IOC_MESSAGE (transfers), xfer);
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if (status < 0)
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{
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g_task_return_new_error (task,
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G_IO_ERROR,
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g_io_error_from_errno (errno),
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"Error invoking ioctl for SPI transfer (%d)",
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errno);
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}
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else
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{
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g_task_return_boolean (task, TRUE);
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}
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}
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/**
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* fpi_spi_transfer_submit:
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* @transfer: (transfer full): The transfer to submit, must have been filled.
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* @cancellable: Cancellable to use, e.g. fpi_device_get_cancellable()
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* @callback: Callback on completion or error
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* @user_data: Data to pass to callback
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*
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* Submit an SPI transfer with a specific timeout and callback functions.
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*
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* The underlying transfer cannot be cancelled. The current implementation
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* will only call @callback after the transfer has been completed.
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*
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* Note that #FpiSpiTransfer will be stolen when this function is called.
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* So that all associated data will be free'ed automatically, after the
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* callback ran unless fpi_usb_transfer_ref() is explicitly called.
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*/
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void
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fpi_spi_transfer_submit (FpiSpiTransfer *transfer,
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GCancellable *cancellable,
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FpiSpiTransferCallback callback,
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gpointer user_data)
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{
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g_autoptr(GTask) task = NULL;
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g_return_if_fail (transfer);
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g_return_if_fail (callback);
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/* Recycling is allowed, but not two at the same time. */
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g_return_if_fail (transfer->callback == NULL);
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transfer->callback = callback;
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transfer->user_data = user_data;
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log_transfer (transfer, TRUE, NULL);
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task = g_task_new (transfer->device,
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cancellable,
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transfer_finish_cb,
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NULL);
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g_task_set_task_data (task,
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g_steal_pointer (&transfer),
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(GDestroyNotify) fpi_spi_transfer_unref);
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g_task_run_in_thread (task, transfer_thread_func);
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}
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/**
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* fpi_spi_transfer_submit_sync:
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* @transfer: The transfer to submit, must have been filled.
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* @error: Location to store #GError to
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*
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* Synchronously submit an SPI transfer. Use of this function is discouraged
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* as it will block all other operations in the application.
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*
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* Note that you still need to fpi_spi_transfer_unref() the
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* #FpiSpiTransfer afterwards.
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*
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* Returns: #TRUE on success, otherwise #FALSE and @error will be set
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*/
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gboolean
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fpi_spi_transfer_submit_sync (FpiSpiTransfer *transfer,
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GError **error)
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{
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g_autoptr(GTask) task = NULL;
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GError *err = NULL;
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gboolean res;
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g_return_val_if_fail (transfer, FALSE);
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/* Recycling is allowed, but not two at the same time. */
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g_return_val_if_fail (transfer->callback == NULL, FALSE);
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log_transfer (transfer, TRUE, NULL);
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task = g_task_new (transfer->device,
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NULL,
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NULL,
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NULL);
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g_task_set_task_data (task,
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fpi_spi_transfer_ref (transfer),
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(GDestroyNotify) fpi_spi_transfer_unref);
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g_task_run_in_thread_sync (task, transfer_thread_func);
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res = g_task_propagate_boolean (task, &err);
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log_transfer (transfer, FALSE, err);
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g_propagate_error (error, err);
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return res;
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}
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@ -0,0 +1,113 @@
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/*
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* FPrint spidev transfer handling
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* Copyright (C) 2019-2020 Benjamin Berg <bberg@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2.1 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library 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
|
||||
* Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public
|
||||
* License along with this library; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma once
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#include "fpi-compat.h"
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#include "fpi-device.h"
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G_BEGIN_DECLS
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#define FPI_TYPE_SPI_TRANSFER (fpi_spi_transfer_get_type ())
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typedef struct _FpiSpiTransfer FpiSpiTransfer;
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typedef struct _FpiSsm FpiSsm;
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typedef void (*FpiSpiTransferCallback)(FpiSpiTransfer *transfer,
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FpDevice *dev,
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gpointer user_data,
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GError *error);
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/**
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* FpiSpiTransfer:
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* @device: The #FpDevice that the transfer belongs to.
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* @ssm: Storage slot to associate the transfer with a state machine.
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* Used by fpi_ssm_spi_transfer_cb() to modify the given state machine.
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* @length_wr: The length of the write buffer
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* @length_rd: The length of the read buffer
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* @buffer_wr: The write buffer.
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* @buffer_rd: The read buffer.
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*
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* Helper for handling SPI transfers. Currently transfers can either be pure
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* write/read transfers or a write followed by a read (full duplex support
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* can easily be added if desired).
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*/
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struct _FpiSpiTransfer
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{
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/*< public >*/
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FpDevice *device;
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FpiSsm *ssm;
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gssize length_wr;
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gssize length_rd;
|
||||
|
||||
guchar *buffer_wr;
|
||||
guchar *buffer_rd;
|
||||
|
||||
/*< private >*/
|
||||
guint ref_count;
|
||||
|
||||
int spidev_fd;
|
||||
|
||||
/* Callbacks */
|
||||
gpointer user_data;
|
||||
FpiSpiTransferCallback callback;
|
||||
|
||||
/* Data free function */
|
||||
GDestroyNotify free_buffer_wr;
|
||||
GDestroyNotify free_buffer_rd;
|
||||
};
|
||||
|
||||
GType fpi_spi_transfer_get_type (void) G_GNUC_CONST;
|
||||
FpiSpiTransfer *fpi_spi_transfer_new (FpDevice *device,
|
||||
int spidev_fd);
|
||||
FpiSpiTransfer *fpi_spi_transfer_ref (FpiSpiTransfer *self);
|
||||
void fpi_spi_transfer_unref (FpiSpiTransfer *self);
|
||||
|
||||
void fpi_spi_transfer_write (FpiSpiTransfer *transfer,
|
||||
gsize length);
|
||||
|
||||
FP_GNUC_ACCESS (read_only, 2, 3)
|
||||
void fpi_spi_transfer_write_full (FpiSpiTransfer *transfer,
|
||||
guint8 *buffer,
|
||||
gsize length,
|
||||
GDestroyNotify free_func);
|
||||
|
||||
void fpi_spi_transfer_read (FpiSpiTransfer *transfer,
|
||||
gsize length);
|
||||
|
||||
FP_GNUC_ACCESS (write_only, 2, 3)
|
||||
void fpi_spi_transfer_read_full (FpiSpiTransfer *transfer,
|
||||
guint8 *buffer,
|
||||
gsize length,
|
||||
GDestroyNotify free_func);
|
||||
|
||||
void fpi_spi_transfer_submit (FpiSpiTransfer *transfer,
|
||||
GCancellable *cancellable,
|
||||
FpiSpiTransferCallback callback,
|
||||
gpointer user_data);
|
||||
|
||||
gboolean fpi_spi_transfer_submit_sync (FpiSpiTransfer *transfer,
|
||||
GError **error);
|
||||
|
||||
|
||||
G_DEFINE_AUTOPTR_CLEANUP_FUNC (FpiSpiTransfer, fpi_spi_transfer_unref)
|
||||
|
||||
G_END_DECLS
|
||||
|
|
@ -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);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -112,4 +112,15 @@ void fpi_ssm_usb_transfer_with_weak_pointer_cb (FpiUsbTransfer *transfer,
|
|||
gpointer weak_ptr,
|
||||
GError *error);
|
||||
|
||||
typedef struct _FpiSpiTransfer FpiSpiTransfer;
|
||||
|
||||
void fpi_ssm_spi_transfer_cb (FpiSpiTransfer *transfer,
|
||||
FpDevice *device,
|
||||
gpointer unused_data,
|
||||
GError *error);
|
||||
void fpi_ssm_spi_transfer_with_weak_pointer_cb (FpiSpiTransfer *transfer,
|
||||
FpDevice *device,
|
||||
gpointer weak_ptr,
|
||||
GError *error);
|
||||
|
||||
G_DEFINE_AUTOPTR_CLEANUP_FUNC (FpiSsm, fpi_ssm_free)
|
||||
|
|
|
|||
|
|
@ -16,6 +16,7 @@ libfprint_private_sources = [
|
|||
'fpi-print.c',
|
||||
'fpi-ssm.c',
|
||||
'fpi-usb-transfer.c',
|
||||
'fpi-spi-transfer.c',
|
||||
]
|
||||
|
||||
libfprint_public_headers = [
|
||||
|
|
@ -40,6 +41,7 @@ libfprint_private_headers = [
|
|||
'fpi-minutiae.h',
|
||||
'fpi-print.h',
|
||||
'fpi-usb-transfer.h',
|
||||
'fpi-spi-transfer.h',
|
||||
'fpi-ssm.h',
|
||||
]
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue