797b2a2ed4
Correct Sphinx style comments in include/dm/uclass.h and add the driver model UCLASS API to the HTML documentation. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
499 lines
17 KiB
C
499 lines
17 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_H
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#define _DM_UCLASS_H
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#include <dm/ofnode.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 (do not access outside driver model)
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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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/* Members of this uclass without aliases don't get a sequence number */
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#define DM_UC_FLAG_NO_AUTO_SEQ (1 << 1)
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/* Same as DM_FLAG_ALLOC_PRIV_DMA */
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#define DM_UC_FLAG_ALLOC_PRIV_DMA (1 << 5)
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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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* @child_pre_probe: Called before a child in this uclass is probed
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* @child_post_probe: Called after a child in this uclass is probed
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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: 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: 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_plat_auto: Each device can hold platform data
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* owned by the uclass as 'dev->uclass_plat'. If the value is non-zero,
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* then this will be automatically allocated.
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* @per_child_auto: 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 fallback if this member is 0 in the driver.
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* @per_child_plat_auto: 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_plat pointer. This value is only used as
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* a fallback if this member is 0 in the driver.
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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 (*child_post_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;
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int per_device_auto;
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int per_device_plat_auto;
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int per_child_auto;
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int per_child_plat_auto;
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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_driver)
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/*
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* These two macros DM_UCLASS_DRIVER_REF and DM_UCLASS_DRIVER_REF are only
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* allowed in code generated by dtoc, because the ordering is important and if
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* other instances creep in then they may mess up the ordering expected by dtoc.
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*
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* It is OK to use them with 'extern' though, since that does not actually
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* add a new record to the linker_list.
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*/
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/**
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* DM_UCLASS_DRIVER_REF() - Get a reference to a uclass driver
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*
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* This is useful in data structures and code for referencing a uclass_driver at
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* build time. Before this is used, an extern UCLASS_DRIVER() must have been
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* declared.
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*
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* For example::
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*
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* extern UCLASS_DRIVER(clk);
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* struct uclass_driver *drvs[] = {
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* DM_UCLASS_DRIVER_REF(clk),
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* };
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*
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* @_name: Name of the uclass_driver. This must be a valid C identifier, used by
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* the linker_list.
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* Return: struct uclass_driver * for the uclass driver
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*/
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#define DM_UCLASS_DRIVER_REF(_name) \
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ll_entry_ref(struct uclass_driver, _name, uclass_driver)
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/**
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* uclass_get_priv() - Get the private data for a uclass
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*
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* @uc: Uclass to check
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* Return: private data, or NULL if none
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*/
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void *uclass_get_priv(const struct uclass *uc);
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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:
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* 0 if OK, -EDEADLK if driver model is not yet inited,
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* other -ve on other 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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* Return: 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_by_name_len() - Look up a uclass by its partial driver name
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*
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* @name: Name to look up
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* @len: Length of the partial name
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* Return: the associated uclass ID, or UCLASS_INVALID if not found
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*/
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enum uclass_id uclass_get_by_name_len(const char *name, int len);
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/**
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* uclass_get_by_name() - Look up a uclass by its driver name
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*
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* @name: Name to look up
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* Return: the associated uclass ID, or UCLASS_INVALID if not found
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*/
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enum uclass_id uclass_get_by_name(const char *name);
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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_ofnode() - 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 node 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_get_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_get_device_by_phandle_id() - Get a uclass device by phandle id
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*
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* This searches the devices in the uclass for one with the given phandle id.
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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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* @phandle_id: the phandle id to look up
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* @devp: Returns pointer to device (there is only one for each node).
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* NULL if there is no such device.
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* Return:
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* 0 if OK, -ENODEV if there is no device match the phandle,
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* other -ve on error
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*/
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int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
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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_DRIVER_GET(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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* This function is useful to start iterating through a list of devices which
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* are functioning correctly and can be probed.
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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 if no error
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* occurred, or NULL if there is no first device, or an error occurred with
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* that device.
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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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* This function is useful to iterate through a list of devices which
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* are functioning correctly and can be probed.
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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 uclass if no error occurred, or NULL if there is
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* no next device, or an error occurred with that next device.
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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_next_device_err() - 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 uclass if no error occurred, or NULL if
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* there is no next device.
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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_next_device_err(struct udevice **devp);
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/**
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* uclass_first_device_check() - 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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* This function is useful to start iterating through a list of devices which
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* are functioning correctly and can be probed.
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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 there
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* is no first device
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* Return: 0 if OK (found or not found), other -ve on error. If an error occurs
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* it is still possible to move to the next device.
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*/
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int uclass_first_device_check(enum uclass_id id, struct udevice **devp);
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/**
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* uclass_next_device_check() - 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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* This function is useful to start iterating through a list of devices which
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* are functioning correctly and can be probed.
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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 uclass if any
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* Return: 0 if OK (found or not found), other -ve on error. If an error occurs
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* it is still possible to move to the next device.
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*/
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int uclass_next_device_check(struct udevice **devp);
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/**
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* uclass_first_device_drvdata() - Find the first device with given driver data
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*
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* This searches through the devices for a particular uclass looking for one
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* that has the given driver data.
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*
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* @id: Uclass ID to check
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* @driver_data: Driver data to search for
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* @devp: Returns pointer to the first matching device in that uclass, if found
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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_drvdata(enum uclass_id id, ulong driver_data,
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struct udevice **devp);
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/**
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* uclass_probe_all() - Probe all devices based on an uclass ID
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*
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* This function probes all devices associated with a uclass by
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* looking for its ID.
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*
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* @id: uclass ID to look up
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* Return: 0 if OK, other -ve on error
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*/
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int uclass_probe_all(enum uclass_id id);
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/**
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* uclass_id_count() - Count the number of devices in a uclass
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*
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* @id: uclass ID to look up
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* Return: number of devices in that uclass (0 if none)
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*/
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int uclass_id_count(enum uclass_id id);
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/**
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* uclass_id_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 ID in order from start to end.
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*
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* If for some reason the uclass cannot be found, this does nothing.
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*
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* @id: enum uclass_id ID to use
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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: temporary uclass variable (``struct uclass *``)
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*/
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#define uclass_id_foreach_dev(id, pos, uc) \
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if (!uclass_get(id, &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() - 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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/**
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* uclass_foreach_dev_probe() - Helper function to iteration through devices
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* of given uclass
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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. Devices are probed if necessary,
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* and ready for use.
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*
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* @id: Uclass ID
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* @dev: struct udevice * to hold the current device. Set to NULL when there
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* are no more devices.
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*/
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#define uclass_foreach_dev_probe(id, dev) \
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for (int _ret = uclass_first_device_err(id, &dev); !_ret && dev; \
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_ret = uclass_next_device_err(&dev))
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#endif
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