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The call op requests that the callee pass a message to the underlying HW or device, wait for a response, and then pass back the response error code and message to the callee. It is useful for drivers that represent some kind of messaging or IPC channel to a remote device. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Simon Glass <sjg@chromium.org>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <misc.h>
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/*
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* Implement a miscellaneous uclass for those do not fit other more
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* general classes. A set of generic read, write and ioctl methods may
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* be used to access the device.
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*/
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int misc_read(struct udevice *dev, int offset, void *buf, int size)
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{
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const struct misc_ops *ops = device_get_ops(dev);
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if (!ops->read)
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return -ENOSYS;
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return ops->read(dev, offset, buf, size);
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}
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int misc_write(struct udevice *dev, int offset, void *buf, int size)
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{
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const struct misc_ops *ops = device_get_ops(dev);
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if (!ops->write)
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return -ENOSYS;
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return ops->write(dev, offset, buf, size);
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}
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int misc_ioctl(struct udevice *dev, unsigned long request, void *buf)
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{
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const struct misc_ops *ops = device_get_ops(dev);
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if (!ops->ioctl)
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return -ENOSYS;
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return ops->ioctl(dev, request, buf);
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}
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int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
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void *rx_msg, int rx_size)
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{
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const struct misc_ops *ops = device_get_ops(dev);
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if (!ops->call)
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return -ENOSYS;
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return ops->call(dev, msgid, tx_msg, tx_size, rx_msg, rx_size);
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}
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UCLASS_DRIVER(misc) = {
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.id = UCLASS_MISC,
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.name = "misc",
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};
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