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4805a7af8e
This function returns -ENODEV when there is no device. This is inconsistent with other functions, such as uclass_find_next_device(), which returns 0. Update it and tidy up the incorrect '-1' values in the comments. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
255 lines
8.0 KiB
C
255 lines
8.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2013 Google, Inc
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*
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* (C) Copyright 2012
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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*/
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#ifndef _DM_UCLASS_INTERNAL_H
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#define _DM_UCLASS_INTERNAL_H
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#include <dm/ofnode.h>
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/**
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* uclass_find_next_free_req_seq() - Get the next free req_seq number
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*
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* This returns the next free req_seq number. This is useful only if
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* OF_CONTROL is not used. The next free req_seq number is simply the
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* maximum req_seq of the uclass + 1.
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* This allows assiging req_seq number in the binding order.
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*
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* @id: Id number of the uclass
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* @return The next free req_seq number
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*/
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int uclass_find_next_free_req_seq(enum uclass_id id);
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/**
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* uclass_get_device_tail() - handle the end of a get_device call
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*
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* This handles returning an error or probing a device as needed.
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*
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* @dev: Device that needs to be probed
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* @ret: Error to return. If non-zero then the device is not probed
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* @devp: Returns the value of 'dev' if there is no error
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* @return ret, if non-zero, else the result of the device_probe() call
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*/
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int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp);
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/**
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* dev_get_uclass_index() - Get uclass and index of device
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* @dev: - in - Device that we want the uclass/index of
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* @ucp: - out - A pointer to the uclass the device belongs to
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*
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* The device is not prepared for use - this is an internal function.
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*
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* @return the index of the device in the uclass list or -ENODEV if not found.
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*/
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int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp);
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/**
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* uclass_find_device() - Return n-th child of uclass
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* @id: Id number of the uclass
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* @index: Position of the child in uclass's list
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* #devp: Returns pointer to device, or NULL on error
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*
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* The device is not prepared for use - this is an internal function.
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* The function uclass_get_device_tail() can be used to probe the device.
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*
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* @return the uclass pointer of a child at the given index or
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* return NULL on error.
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*/
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int uclass_find_device(enum uclass_id id, int index, struct udevice **devp);
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/**
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* uclass_find_first_device() - Return the first device in a uclass
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* @id: Id number of the uclass
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* #devp: Returns pointer to device, or NULL on error
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*
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* The device is not prepared for use - this is an internal function.
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* The function uclass_get_device_tail() can be used to probe the device.
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*
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* @return 0 if OK (found or not found), -ve on error
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*/
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int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
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/**
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* uclass_find_next_device() - Return the next device in a uclass
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* @devp: On entry, pointer to device to lookup. On exit, returns pointer
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* to the next device in the same uclass, or NULL if none
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*
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* The device is not prepared for use - this is an internal function.
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* The function uclass_get_device_tail() can be used to probe the device.
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*
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* @return 0 if OK (found or not found), -ve on error
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*/
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int uclass_find_next_device(struct udevice **devp);
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/**
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* uclass_find_device_by_name() - Find uclass device based on ID and name
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*
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* This searches for a device with the exactly given name.
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*
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* The device is NOT probed, it is merely returned.
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*
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* @id: ID to look up
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* @name: name of a device to find
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* @devp: Returns pointer to device (the first one with the name)
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* @return 0 if OK, -ve on error
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*/
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int uclass_find_device_by_name(enum uclass_id id, const char *name,
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struct udevice **devp);
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/**
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* uclass_find_device_by_seq() - Find uclass device based on ID and sequence
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*
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* This searches for a device with the given seq or req_seq.
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*
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* For seq, if an active device has this sequence it will be returned.
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* If there is no such device then this will return -ENODEV.
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*
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* For req_seq, if a device (whether activated or not) has this req_seq
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* value, that device will be returned. This is a strong indication that
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* the device will receive that sequence when activated.
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*
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* The device is NOT probed, it is merely returned.
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*
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* @id: ID to look up
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* @seq_or_req_seq: Sequence number to find (0=first)
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* @find_req_seq: true to find req_seq, false to find seq
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* @devp: Returns pointer to device (there is only one per for each seq)
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* @return 0 if OK, -ve on error
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*/
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int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
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bool find_req_seq, struct udevice **devp);
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/**
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* uclass_find_device_by_of_offset() - Find a uclass device by device tree node
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*
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* This searches the devices in the uclass for one attached to the given
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* device tree node.
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*
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* The device is NOT probed, it is merely returned.
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*
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* @id: ID to look up
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* @node: Device tree offset to search for (if -ve then -ENODEV is returned)
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* @devp: Returns pointer to device (there is only one for each node)
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* @return 0 if OK, -ve on error
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*/
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int uclass_find_device_by_of_offset(enum uclass_id id, int node,
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struct udevice **devp);
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/**
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* uclass_find_device_by_of_node() - Find a uclass device by device tree node
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*
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* This searches the devices in the uclass for one attached to the given
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* device tree node.
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*
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* The device is NOT probed, it is merely returned.
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*
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* @id: ID to look up
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* @node: Device tree offset to search for (if NULL then -ENODEV is returned)
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* @devp: Returns pointer to device (there is only one for each node)
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* @return 0 if OK, -ve on error
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*/
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int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
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struct udevice **devp);
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/**
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* uclass_find_device_by_phandle() - Find a uclass device by phandle
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*
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* This searches the devices in the uclass for one with the given phandle.
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*
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* The device is NOT probed, it is merely returned.
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*
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* @id: ID to look up
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* @parent: Parent device containing the phandle pointer
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* @name: Name of property in the parent device node
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* @devp: Returns pointer to device (there is only one for each node)
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* @return 0 if OK, -ENOENT if there is no @name present in the node, other
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* -ve on error
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*/
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int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent,
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const char *name, struct udevice **devp);
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/**
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* uclass_bind_device() - Associate device with a uclass
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*
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* Connect the device into uclass's list of devices.
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*
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* @dev: Pointer to the device
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* #return 0 on success, -ve on error
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*/
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int uclass_bind_device(struct udevice *dev);
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/**
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* uclass_unbind_device() - Deassociate device with a uclass
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*
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* Disconnect the device from uclass's list of devices.
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*
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* @dev: Pointer to the device
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* #return 0 on success, -ve on error
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*/
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int uclass_unbind_device(struct udevice *dev);
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#else
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static inline int uclass_unbind_device(struct udevice *dev) { return 0; }
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#endif
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/**
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* uclass_pre_probe_device() - Deal with a device that is about to be probed
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*
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* Perform any pre-processing that is needed by the uclass before it can be
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* probed. This includes the uclass' pre-probe() method and the parent
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* uclass' child_pre_probe() method.
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*
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* @dev: Pointer to the device
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* #return 0 on success, -ve on error
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*/
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int uclass_pre_probe_device(struct udevice *dev);
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/**
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* uclass_post_probe_device() - Deal with a device that has just been probed
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*
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* Perform any post-processing of a probed device that is needed by the
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* uclass.
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*
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* @dev: Pointer to the device
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* #return 0 on success, -ve on error
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*/
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int uclass_post_probe_device(struct udevice *dev);
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/**
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* uclass_pre_remove_device() - Handle a device which is about to be removed
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*
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* Perform any pre-processing of a device that is about to be removed.
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*
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* @dev: Pointer to the device
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* #return 0 on success, -ve on error
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*/
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int uclass_pre_remove_device(struct udevice *dev);
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#else
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static inline int uclass_pre_remove_device(struct udevice *dev) { return 0; }
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#endif
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/**
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* uclass_find() - Find uclass by its id
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*
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* @id: Id to serach for
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* @return pointer to uclass, or NULL if not found
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*/
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struct uclass *uclass_find(enum uclass_id key);
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/**
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* uclass_destroy() - Destroy a uclass
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*
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* Destroy a uclass and all its devices
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*
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* @uc: uclass to destroy
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* @return 0 on success, -ve on error
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*/
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int uclass_destroy(struct uclass *uc);
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#endif
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