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![Simon Glass](/assets/img/avatar_default.png)
In a very few cases we need to adjust the driver model root device, such as when setting it up at initialisation. Add a macro to make this easier. Signed-off-by: Simon Glass <sjg@chromium.org>
287 lines
5.0 KiB
C
287 lines
5.0 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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#include <common.h>
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#include <errno.h>
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#include <malloc.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/uclass.h>
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#include <dm/uclass-internal.h>
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#include <dm/util.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct uclass *uclass_find(enum uclass_id key)
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{
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struct uclass *uc;
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/*
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* TODO(sjg@chromium.org): Optimise this, perhaps moving the found
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* node to the start of the list, or creating a linear array mapping
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* id to node.
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*/
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list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
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if (uc->uc_drv->id == key)
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return uc;
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}
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return NULL;
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}
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/**
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* uclass_add() - Create new uclass in list
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* @id: Id number to create
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* @ucp: Returns pointer to uclass, or NULL on error
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* @return 0 on success, -ve on error
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*
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* The new uclass is added to the list. There must be only one uclass for
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* each id.
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*/
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static int uclass_add(enum uclass_id id, struct uclass **ucp)
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{
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struct uclass_driver *uc_drv;
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struct uclass *uc;
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int ret;
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*ucp = NULL;
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uc_drv = lists_uclass_lookup(id);
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if (!uc_drv) {
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dm_warn("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
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id);
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return -ENOENT;
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}
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if (uc_drv->ops) {
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dm_warn("No ops for uclass id %d\n", id);
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return -EINVAL;
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}
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uc = calloc(1, sizeof(*uc));
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if (!uc)
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return -ENOMEM;
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if (uc_drv->priv_auto_alloc_size) {
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uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
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if (!uc->priv) {
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ret = -ENOMEM;
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goto fail_mem;
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}
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}
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uc->uc_drv = uc_drv;
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INIT_LIST_HEAD(&uc->sibling_node);
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INIT_LIST_HEAD(&uc->dev_head);
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list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);
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if (uc_drv->init) {
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ret = uc_drv->init(uc);
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if (ret)
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goto fail;
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}
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*ucp = uc;
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return 0;
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fail:
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if (uc_drv->priv_auto_alloc_size) {
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free(uc->priv);
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uc->priv = NULL;
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}
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list_del(&uc->sibling_node);
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fail_mem:
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free(uc);
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return ret;
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}
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int uclass_destroy(struct uclass *uc)
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{
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struct uclass_driver *uc_drv;
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struct udevice *dev, *tmp;
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int ret;
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list_for_each_entry_safe(dev, tmp, &uc->dev_head, uclass_node) {
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ret = device_remove(dev);
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if (ret)
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return ret;
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ret = device_unbind(dev);
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if (ret)
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return ret;
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}
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uc_drv = uc->uc_drv;
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if (uc_drv->destroy)
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uc_drv->destroy(uc);
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list_del(&uc->sibling_node);
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if (uc_drv->priv_auto_alloc_size)
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free(uc->priv);
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free(uc);
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return 0;
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}
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int uclass_get(enum uclass_id id, struct uclass **ucp)
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{
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struct uclass *uc;
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*ucp = NULL;
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uc = uclass_find(id);
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if (!uc)
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return uclass_add(id, ucp);
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*ucp = uc;
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return 0;
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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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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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list_for_each_entry(dev, &uc->dev_head, uclass_node) {
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if (!index--) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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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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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_find_device(id, index, &dev);
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if (ret)
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return ret;
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ret = device_probe(dev);
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if (ret)
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return ret;
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*devp = dev;
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return 0;
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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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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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if (list_empty(&uc->dev_head))
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return 0;
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dev = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
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ret = device_probe(dev);
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if (ret)
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return ret;
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*devp = dev;
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return 0;
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}
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int uclass_next_device(struct udevice **devp)
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{
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struct udevice *dev = *devp;
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int ret;
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*devp = NULL;
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if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
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return 0;
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dev = list_entry(dev->uclass_node.next, struct udevice,
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uclass_node);
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ret = device_probe(dev);
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if (ret)
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return ret;
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*devp = dev;
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return 0;
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}
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int uclass_bind_device(struct udevice *dev)
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{
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struct uclass *uc;
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int ret;
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uc = dev->uclass;
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list_add_tail(&dev->uclass_node, &uc->dev_head);
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if (uc->uc_drv->post_bind) {
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ret = uc->uc_drv->post_bind(dev);
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if (ret) {
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list_del(&dev->uclass_node);
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return ret;
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}
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}
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return 0;
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}
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int uclass_unbind_device(struct udevice *dev)
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{
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struct uclass *uc;
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int ret;
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uc = dev->uclass;
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if (uc->uc_drv->pre_unbind) {
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ret = uc->uc_drv->pre_unbind(dev);
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if (ret)
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return ret;
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}
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list_del(&dev->uclass_node);
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return 0;
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}
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int uclass_post_probe_device(struct udevice *dev)
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{
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struct uclass_driver *uc_drv = dev->uclass->uc_drv;
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if (uc_drv->post_probe)
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return uc_drv->post_probe(dev);
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return 0;
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}
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int uclass_pre_remove_device(struct udevice *dev)
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{
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struct uclass_driver *uc_drv;
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struct uclass *uc;
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int ret;
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uc = dev->uclass;
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uc_drv = uc->uc_drv;
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if (uc->uc_drv->pre_remove) {
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ret = uc->uc_drv->pre_remove(dev);
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if (ret)
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return ret;
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}
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if (uc_drv->per_device_auto_alloc_size) {
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free(dev->uclass_priv);
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dev->uclass_priv = NULL;
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}
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return 0;
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}
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