diff options
Diffstat (limited to 'drivers/core/uclass.c')
| -rw-r--r-- | drivers/core/uclass.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c new file mode 100644 index 000000000..4df5a8bd3 --- /dev/null +++ b/drivers/core/uclass.c @@ -0,0 +1,285 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <malloc.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/uclass.h> +#include <dm/uclass-internal.h> +#include <dm/util.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct uclass *uclass_find(enum uclass_id key) +{ + struct uclass *uc; + + /* + * TODO(sjg@chromium.org): Optimise this, perhaps moving the found + * node to the start of the list, or creating a linear array mapping + * id to node. + */ + list_for_each_entry(uc, &gd->uclass_root, sibling_node) { + if (uc->uc_drv->id == key) + return uc; + } + + return NULL; +} + +/** + * uclass_add() - Create new uclass in list + * @id: Id number to create + * @ucp: Returns pointer to uclass, or NULL on error + * @return 0 on success, -ve on error + * + * The new uclass is added to the list. There must be only one uclass for + * each id. + */ +static int uclass_add(enum uclass_id id, struct uclass **ucp) +{ + struct uclass_driver *uc_drv; + struct uclass *uc; + int ret; + + *ucp = NULL; + uc_drv = lists_uclass_lookup(id); + if (!uc_drv) { + dm_warn("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n", + id); + return -ENOENT; + } + if (uc_drv->ops) { + dm_warn("No ops for uclass id %d\n", id); + return -EINVAL; + } + uc = calloc(1, sizeof(*uc)); + if (!uc) + return -ENOMEM; + if (uc_drv->priv_auto_alloc_size) { + uc->priv = calloc(1, uc_drv->priv_auto_alloc_size); + if (!uc->priv) { + ret = -ENOMEM; + goto fail_mem; + } + } + uc->uc_drv = uc_drv; + INIT_LIST_HEAD(&uc->sibling_node); + INIT_LIST_HEAD(&uc->dev_head); + list_add(&uc->sibling_node, &gd->uclass_root); + + if (uc_drv->init) { + ret = uc_drv->init(uc); + if (ret) + goto fail; + } + + *ucp = uc; + + return 0; +fail: + if (uc_drv->priv_auto_alloc_size) { + free(uc->priv); + uc->priv = NULL; + } + list_del(&uc->sibling_node); +fail_mem: + free(uc); + + return ret; +} + +int uclass_destroy(struct uclass *uc) +{ + struct uclass_driver *uc_drv; + struct device *dev, *tmp; + int ret; + + list_for_each_entry_safe(dev, tmp, &uc->dev_head, uclass_node) { + ret = device_remove(dev); + if (ret) + return ret; + ret = device_unbind(dev); + if (ret) + return ret; + } + + uc_drv = uc->uc_drv; + if (uc_drv->destroy) + uc_drv->destroy(uc); + list_del(&uc->sibling_node); + if (uc_drv->priv_auto_alloc_size) + free(uc->priv); + free(uc); + + return 0; +} + +int uclass_get(enum uclass_id id, struct uclass **ucp) +{ + struct uclass *uc; + + *ucp = NULL; + uc = uclass_find(id); + if (!uc) + return uclass_add(id, ucp); + *ucp = uc; + + return 0; +} + +int uclass_find_device(enum uclass_id id, int index, struct device **devp) +{ + struct uclass *uc; + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_get(id, &uc); + if (ret) + return ret; + + list_for_each_entry(dev, &uc->dev_head, uclass_node) { + if (!index--) { + *devp = dev; + return 0; + } + } + + return -ENODEV; +} + +int uclass_get_device(enum uclass_id id, int index, struct device **devp) +{ + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_find_device(id, index, &dev); + if (ret) + return ret; + + ret = device_probe(dev); + if (ret) + return ret; + + *devp = dev; + + return 0; +} + +int uclass_first_device(enum uclass_id id, struct device **devp) +{ + struct uclass *uc; + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_get(id, &uc); + if (ret) + return ret; + if (list_empty(&uc->dev_head)) + return 0; + + dev = list_first_entry(&uc->dev_head, struct device, uclass_node); + ret = device_probe(dev); + if (ret) + return ret; + *devp = dev; + + return 0; +} + +int uclass_next_device(struct device **devp) +{ + struct device *dev = *devp; + int ret; + + *devp = NULL; + if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head)) + return 0; + + dev = list_entry(dev->uclass_node.next, struct device, uclass_node); + ret = device_probe(dev); + if (ret) + return ret; + *devp = dev; + + return 0; +} + +int uclass_bind_device(struct device *dev) +{ + struct uclass *uc; + int ret; + + uc = dev->uclass; + + list_add_tail(&dev->uclass_node, &uc->dev_head); + + if (uc->uc_drv->post_bind) { + ret = uc->uc_drv->post_bind(dev); + if (ret) { + list_del(&dev->uclass_node); + return ret; + } + } + + return 0; +} + +int uclass_unbind_device(struct device *dev) +{ + struct uclass *uc; + int ret; + + uc = dev->uclass; + if (uc->uc_drv->pre_unbind) { + ret = uc->uc_drv->pre_unbind(dev); + if (ret) + return ret; + } + + list_del(&dev->uclass_node); + return 0; +} + +int uclass_post_probe_device(struct device *dev) +{ + struct uclass_driver *uc_drv = dev->uclass->uc_drv; + + if (uc_drv->post_probe) + return uc_drv->post_probe(dev); + + return 0; +} + +int uclass_pre_remove_device(struct device *dev) +{ + struct uclass_driver *uc_drv; + struct uclass *uc; + int ret; + + uc = dev->uclass; + uc_drv = uc->uc_drv; + if (uc->uc_drv->pre_remove) { + ret = uc->uc_drv->pre_remove(dev); + if (ret) + return ret; + } + if (uc_drv->per_device_auto_alloc_size) { + free(dev->uclass_priv); + dev->uclass_priv = NULL; + } + + return 0; +} |