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0f6a928d03
Currently acpi_dma_request_slave_chan_by_index() and acpi_dma_request_slave_chan_by_name() return only requested channel or NULL. This patch converts them to return appropriate error code instead of NULL in case of unsuccessfull request. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/*
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* ACPI helpers for DMA request / controller
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*
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* Based on of_dma.h
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*
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* Copyright (C) 2013, Intel Corporation
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_ACPI_DMA_H
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#define __LINUX_ACPI_DMA_H
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/dmaengine.h>
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/**
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* struct acpi_dma_spec - slave device DMA resources
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* @chan_id: channel unique id
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* @slave_id: request line unique id
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* @dev: struct device of the DMA controller to be used in the filter
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* function
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*/
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struct acpi_dma_spec {
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int chan_id;
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int slave_id;
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struct device *dev;
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};
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/**
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* struct acpi_dma - representation of the registered DMAC
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* @dma_controllers: linked list node
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* @dev: struct device of this controller
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* @acpi_dma_xlate: callback function to find a suitable channel
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* @data: private data used by a callback function
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* @base_request_line: first supported request line (CSRT)
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* @end_request_line: last supported request line (CSRT)
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*/
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struct acpi_dma {
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struct list_head dma_controllers;
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struct device *dev;
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *);
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void *data;
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unsigned short base_request_line;
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unsigned short end_request_line;
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};
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/* Used with acpi_dma_simple_xlate() */
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struct acpi_dma_filter_info {
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dma_cap_mask_t dma_cap;
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dma_filter_fn filter_fn;
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};
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#ifdef CONFIG_DMA_ACPI
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int acpi_dma_controller_register(struct device *dev,
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *),
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void *data);
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int acpi_dma_controller_free(struct device *dev);
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int devm_acpi_dma_controller_register(struct device *dev,
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *),
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void *data);
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void devm_acpi_dma_controller_free(struct device *dev);
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struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
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size_t index);
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struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
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const char *name);
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struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
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struct acpi_dma *adma);
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#else
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static inline int acpi_dma_controller_register(struct device *dev,
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *),
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void *data)
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{
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return -ENODEV;
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}
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static inline int acpi_dma_controller_free(struct device *dev)
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{
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return -ENODEV;
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}
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static inline int devm_acpi_dma_controller_register(struct device *dev,
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *),
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void *data)
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{
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return -ENODEV;
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}
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static inline void devm_acpi_dma_controller_free(struct device *dev)
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{
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}
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static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
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struct device *dev, size_t index)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
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struct device *dev, const char *name)
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{
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return ERR_PTR(-ENODEV);
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}
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#define acpi_dma_simple_xlate NULL
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#endif
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#define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index
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#endif /* __LINUX_ACPI_DMA_H */
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