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0a5f6f869f
It is useful in debug() statements to display the name of the uclass for a device. Add a simple function to provide this. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
299 lines
10 KiB
C
299 lines
10 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _DM_UCLASS_H
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#define _DM_UCLASS_H
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#include <dm/uclass-id.h>
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#include <linker_lists.h>
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#include <linux/list.h>
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/**
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* struct uclass - a U-Boot drive class, collecting together similar drivers
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*
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* A uclass provides an interface to a particular function, which is
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* implemented by one or more drivers. Every driver belongs to a uclass even
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* if it is the only driver in that uclass. An example uclass is GPIO, which
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* provides the ability to change read inputs, set and clear outputs, etc.
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* There may be drivers for on-chip SoC GPIO banks, I2C GPIO expanders and
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* PMIC IO lines, all made available in a unified way through the uclass.
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*
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* @priv: Private data for this uclass
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* @uc_drv: The driver for the uclass itself, not to be confused with a
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* 'struct driver'
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* @dev_head: List of devices in this uclass (devices are attached to their
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* uclass when their bind method is called)
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* @sibling_node: Next uclass in the linked list of uclasses
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*/
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struct uclass {
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void *priv;
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struct uclass_driver *uc_drv;
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struct list_head dev_head;
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struct list_head sibling_node;
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};
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struct driver;
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struct udevice;
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/* Members of this uclass sequence themselves with aliases */
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#define DM_UC_FLAG_SEQ_ALIAS (1 << 0)
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/**
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* struct uclass_driver - Driver for the uclass
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*
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* A uclass_driver provides a consistent interface to a set of related
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* drivers.
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*
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* @name: Name of uclass driver
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* @id: ID number of this uclass
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* @post_bind: Called after a new device is bound to this uclass
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* @pre_unbind: Called before a device is unbound from this uclass
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* @pre_probe: Called before a new device is probed
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* @post_probe: Called after a new device is probed
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* @pre_remove: Called before a device is removed
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* @child_post_bind: Called after a child is bound to a device in this uclass
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* @init: Called to set up the uclass
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* @destroy: Called to destroy the uclass
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* @priv_auto_alloc_size: If non-zero this is the size of the private data
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* to be allocated in the uclass's ->priv pointer. If zero, then the uclass
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* driver is responsible for allocating any data required.
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* @per_device_auto_alloc_size: Each device can hold private data owned
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* by the uclass. If required this will be automatically allocated if this
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* value is non-zero.
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* @per_device_platdata_auto_alloc_size: Each device can hold platform data
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* owned by the uclass as 'dev->uclass_platdata'. If the value is non-zero,
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* then this will be automatically allocated.
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* @per_child_auto_alloc_size: Each child device (of a parent in this
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* uclass) can hold parent data for the device/uclass. This value is only
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* used as a falback if this member is 0 in the driver.
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* @per_child_platdata_auto_alloc_size: A bus likes to store information about
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* its children. If non-zero this is the size of this data, to be allocated
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* in the child device's parent_platdata pointer. This value is only used as
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* a falback if this member is 0 in the driver.
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* @ops: Uclass operations, providing the consistent interface to devices
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* within the uclass.
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* @flags: Flags for this uclass (DM_UC_...)
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*/
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struct uclass_driver {
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const char *name;
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enum uclass_id id;
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int (*post_bind)(struct udevice *dev);
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int (*pre_unbind)(struct udevice *dev);
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int (*pre_probe)(struct udevice *dev);
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int (*post_probe)(struct udevice *dev);
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int (*pre_remove)(struct udevice *dev);
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int (*child_post_bind)(struct udevice *dev);
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int (*child_pre_probe)(struct udevice *dev);
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int (*init)(struct uclass *class);
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int (*destroy)(struct uclass *class);
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int priv_auto_alloc_size;
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int per_device_auto_alloc_size;
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int per_device_platdata_auto_alloc_size;
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int per_child_auto_alloc_size;
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int per_child_platdata_auto_alloc_size;
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const void *ops;
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uint32_t flags;
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};
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/* Declare a new uclass_driver */
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#define UCLASS_DRIVER(__name) \
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ll_entry_declare(struct uclass_driver, __name, uclass)
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/**
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* uclass_get() - Get a uclass based on an ID, creating it if needed
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*
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* Every uclass is identified by an ID, a number from 0 to n-1 where n is
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* the number of uclasses. This function allows looking up a uclass by its
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* ID.
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*
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* @key: ID to look up
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* @ucp: Returns pointer to uclass (there is only one per ID)
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* @return 0 if OK, -ve on error
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*/
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int uclass_get(enum uclass_id key, struct uclass **ucp);
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/**
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* uclass_get_name() - Get the name of a uclass driver
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*
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* @id: ID to look up
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* @returns the name of the uclass driver for that ID, or NULL if none
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*/
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const char *uclass_get_name(enum uclass_id id);
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/**
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* uclass_get_device() - Get a uclass device based on an ID and index
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*
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* The device is probed to activate it ready for use.
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*
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* @id: ID to look up
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* @index: Device number within that uclass (0=first)
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* @devp: Returns pointer to device (there is only one per for each ID)
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* @return 0 if OK, -ve on error
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*/
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int uclass_get_device(enum uclass_id id, int index, struct udevice **devp);
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/**
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* uclass_get_device_by_name() - Get a uclass device by its name
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*
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* This searches the devices in the uclass for one with the exactly given name.
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*
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* The device is probed to activate it ready for use.
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*
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* @id: ID to look up
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* @name: name of a device to get
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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_get_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_get_device_by_seq() - Get a uclass device based on an ID and sequence
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*
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* If an active device has this sequence it will be returned. If there is no
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* such device then this will check for a device that is requesting this
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* sequence.
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*
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* The device is probed to activate it ready for use.
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*
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* @id: ID to look up
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* @seq: Sequence number to find (0=first)
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* @devp: Returns pointer to device (there is only one for each seq)
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* @return 0 if OK, -ve on error
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*/
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int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp);
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/**
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* uclass_get_device_by_of_offset() - Get 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 probed to activate it ready for use.
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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_get_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_get_device_by_phandle() - Get 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 probed to activate it ready for use.
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*
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* @id: uclass 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_get_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_get_device_by_driver() - Get a uclass device for a driver
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*
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* This searches the devices in the uclass for one that uses the given
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* driver. Use DM_GET_DRIVER(name) for the @drv argument, where 'name' is
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* the driver name - as used in U_BOOT_DRIVER(name).
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*
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* The device is probed to activate it ready for use.
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*
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* @id: ID to look up
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* @drv: Driver to look for
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* @devp: Returns pointer to the first device with that driver
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* @return 0 if OK, -ve on error
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*/
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int uclass_get_device_by_driver(enum uclass_id id, const struct driver *drv,
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struct udevice **devp);
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/**
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* uclass_first_device() - Get the first device in a uclass
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*
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* The device returned is probed if necessary, and ready for use
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*
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* @id: Uclass ID to look up
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* @devp: Returns pointer to the first device in that uclass, or NULL if none
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* @return 0 if OK (found or not found), other -ve on error
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*/
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int uclass_first_device(enum uclass_id id, struct udevice **devp);
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/**
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* uclass_first_device_err() - Get the first device in a uclass
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*
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* The device returned is probed if necessary, and ready for use
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*
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* @id: Uclass ID to look up
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* @devp: Returns pointer to the first device in that uclass, or NULL if none
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* @return 0 if found, -ENODEV if not found, other -ve on error
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*/
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int uclass_first_device_err(enum uclass_id id, struct udevice **devp);
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/**
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* uclass_next_device() - Get the next device in a uclass
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*
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* The device returned is probed if necessary, and ready for use
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*
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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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* @return 0 if OK (found or not found), other -ve on error
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*/
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int uclass_next_device(struct udevice **devp);
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/**
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* uclass_resolve_seq() - Resolve a device's sequence number
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*
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* On entry dev->seq is -1, and dev->req_seq may be -1 (to allocate a
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* sequence number automatically, or >= 0 to select a particular number.
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* If the requested sequence number is in use, then this device will
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* be allocated another one.
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*
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* Note that the device's seq value is not changed by this function.
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*
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* @dev: Device for which to allocate sequence number
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* @return sequence number allocated, or -ve on error
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*/
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int uclass_resolve_seq(struct udevice *dev);
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/**
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* uclass_foreach_dev() - Helper function to iteration through devices
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*
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* This creates a for() loop which works through the available devices in
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* a uclass in order from start to end.
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*
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* @pos: struct udevice * to hold the current device. Set to NULL when there
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* are no more devices.
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* @uc: uclass to scan
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*/
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#define uclass_foreach_dev(pos, uc) \
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list_for_each_entry(pos, &uc->dev_head, uclass_node)
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/**
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* uclass_foreach_dev_safe() - Helper function to safely iteration through devs
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*
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* This creates a for() loop which works through the available devices in
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* a uclass in order from start to end. Inside the loop, it is safe to remove
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* @pos if required.
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*
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* @pos: struct udevice * to hold the current device. Set to NULL when there
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* are no more devices.
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* @next: struct udevice * to hold the next next
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* @uc: uclass to scan
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*/
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#define uclass_foreach_dev_safe(pos, next, uc) \
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list_for_each_entry_safe(pos, next, &uc->dev_head, uclass_node)
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#endif
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