d3e268e9e5
Add diag_ipc_bridge driver which is used to communicate with the diag
and QMI interfaces exposed by Qualcomm devices. This snapshot is
taken as of msm-4.14 'commit 9f6f3a7d1aa9 ("msm: kgsl: Perform cache flush
on the pages obtained using get_user_pages()")'.
Change-Id: I8d5069d40b623b2a06eb3eb45a8c5fca1769222a
Signed-off-by: Vijayavardhan Vennapusa <quic_vvreddy@quicinc.com>
60 lines
2.7 KiB
C
60 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2013 The Linux Foundation. All rights reserved.
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* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#ifndef __MSM_IPC_BRIDGE_H__
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#define __MSM_IPC_BRIDGE_H__
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#include <linux/platform_device.h>
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/*
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* The IPC bridge driver adds a IPC bridge platform device when the
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* underlying transport is ready. The IPC transport driver acts as a
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* platform driver for this device. The platform data is populated by
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* IPC bridge driver to facilitate I/O. The callback functions are
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* passed in platform data to avoid export functions. This would allow
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* different bridge drivers to exist in the kernel. The IPC bridge driver
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* removes the platform device when the underly transport is no longer
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* available. It typically happens during shutdown and remote processor's
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* subsystem restart.
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*/
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/**
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* struct ipc_bridge_platform_data - platform device data for IPC
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* transport driver.
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* @max_read_size: The maximum possible read size.
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* @max_write_size: The maximum possible write size.
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* @open: The open must be called before starting I/O. The IPC bridge
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* driver use the platform device pointer to identify the
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* underlying transport channel. The IPC bridge driver may
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* notify that remote processor that it is ready to receive
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* data. Returns 0 upon success and appropriate error code
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* upon failure.
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* @read: The read is done synchronously and should be called from process
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* context. Returns the number of bytes read from remote
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* processor or error code upon failure. The IPC transport
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* driver may pass the buffer of max_read_size length if the
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* available data size is not known in advance.
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* @write: The write is done synchronously and should be called from process
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* context. The IPC bridge driver uses the same buffer for DMA
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* to avoid additional memcpy. So it must be physically contiguous.
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* Returns the number of bytes written or error code upon failure.
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* @close: The close must be called when the IPC bridge platform device
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* is removed. The IPC transport driver may call close when
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* it is no longer required to communicate with remote processor.
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*/
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struct ipc_bridge_platform_data {
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unsigned int max_read_size;
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unsigned int max_write_size;
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int (*open)(struct platform_device *pdev);
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int (*read)(struct platform_device *pdev, char *buf,
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unsigned int count);
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int (*write)(struct platform_device *pdev, char *buf,
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unsigned int count);
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void (*close)(struct platform_device *pdev);
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};
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#endif
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