uclass-internal.h
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/*
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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