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u-boot/include/dm/uclass-internal.h
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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