--- /dev/null
+/*
+ * Device manager
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/platdata.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+#include <linux/err.h>
+#include <linux/list.h>
+
+/**
+ * device_chld_unbind() - Unbind all device's children from the device
+ *
+ * On error, the function continues to unbind all children, and reports the
+ * first error.
+ *
+ * @dev: The device that is to be stripped of its children
+ * @return 0 on success, -ve on error
+ */
+static int device_chld_unbind(struct device *dev)
+{
+ struct device *pos, *n;
+ int ret, saved_ret = 0;
+
+ assert(dev);
+
+ list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
+ ret = device_unbind(pos);
+ if (ret && !saved_ret)
+ saved_ret = ret;
+ }
+
+ return saved_ret;
+}
+
+/**
+ * device_chld_remove() - Stop all device's children
+ * @dev: The device whose children are to be removed
+ * @return 0 on success, -ve on error
+ */
+static int device_chld_remove(struct device *dev)
+{
+ struct device *pos, *n;
+ int ret;
+
+ assert(dev);
+
+ list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
+ ret = device_remove(pos);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int device_bind(struct device *parent, struct driver *drv, const char *name,
+ void *platdata, int of_offset, struct device **devp)
+{
+ struct device *dev;
+ struct uclass *uc;
+ int ret = 0;
+
+ *devp = NULL;
+ if (!name)
+ return -EINVAL;
+
+ ret = uclass_get(drv->id, &uc);
+ if (ret)
+ return ret;
+
+ dev = calloc(1, sizeof(struct device));
+ if (!dev)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dev->sibling_node);
+ INIT_LIST_HEAD(&dev->child_head);
+ INIT_LIST_HEAD(&dev->uclass_node);
+ dev->platdata = platdata;
+ dev->name = name;
+ dev->of_offset = of_offset;
+ dev->parent = parent;
+ dev->driver = drv;
+ dev->uclass = uc;
+ if (!dev->platdata && drv->platdata_auto_alloc_size)
+ dev->flags |= DM_FLAG_ALLOC_PDATA;
+
+ /* put dev into parent's successor list */
+ if (parent)
+ list_add_tail(&dev->sibling_node, &parent->child_head);
+
+ ret = uclass_bind_device(dev);
+ if (ret)
+ goto fail_bind;
+
+ /* if we fail to bind we remove device from successors and free it */
+ if (drv->bind) {
+ ret = drv->bind(dev);
+ if (ret) {
+ if (uclass_unbind_device(dev)) {
+ dm_warn("Failed to unbind dev '%s' on error path\n",
+ dev->name);
+ }
+ goto fail_bind;
+ }
+ }
+ if (parent)
+ dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
+ *devp = dev;
+
+ return 0;
+
+fail_bind:
+ list_del(&dev->sibling_node);
+ free(dev);
+ return ret;
+}
+
+int device_bind_by_name(struct device *parent, const struct driver_info *info,
+ struct device **devp)
+{
+ struct driver *drv;
+
+ drv = lists_driver_lookup_name(info->name);
+ if (!drv)
+ return -ENOENT;
+
+ return device_bind(parent, drv, info->name, (void *)info->platdata,
+ -1, devp);
+}
+
+int device_unbind(struct device *dev)
+{
+ struct driver *drv;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ if (dev->flags & DM_FLAG_ACTIVATED)
+ return -EINVAL;
+
+ drv = dev->driver;
+ assert(drv);
+
+ if (drv->unbind) {
+ ret = drv->unbind(dev);
+ if (ret)
+ return ret;
+ }
+
+ ret = device_chld_unbind(dev);
+ if (ret)
+ return ret;
+
+ ret = uclass_unbind_device(dev);
+ if (ret)
+ return ret;
+
+ if (dev->parent)
+ list_del(&dev->sibling_node);
+ free(dev);
+
+ return 0;
+}
+
+/**
+ * device_free() - Free memory buffers allocated by a device
+ * @dev: Device that is to be started
+ */
+static void device_free(struct device *dev)
+{
+ int size;
+
+ if (dev->driver->priv_auto_alloc_size) {
+ free(dev->priv);
+ dev->priv = NULL;
+ }
+ if (dev->flags & DM_FLAG_ALLOC_PDATA) {
+ free(dev->platdata);
+ dev->platdata = NULL;
+ }
+ size = dev->uclass->uc_drv->per_device_auto_alloc_size;
+ if (size) {
+ free(dev->uclass_priv);
+ dev->uclass_priv = NULL;
+ }
+}
+
+int device_probe(struct device *dev)
+{
+ struct driver *drv;
+ int size = 0;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ if (dev->flags & DM_FLAG_ACTIVATED)
+ return 0;
+
+ drv = dev->driver;
+ assert(drv);
+
+ /* Allocate private data and platdata if requested */
+ if (drv->priv_auto_alloc_size) {
+ dev->priv = calloc(1, drv->priv_auto_alloc_size);
+ if (!dev->priv) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ }
+ /* Allocate private data if requested */
+ if (dev->flags & DM_FLAG_ALLOC_PDATA) {
+ dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
+ if (!dev->platdata) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ }
+ size = dev->uclass->uc_drv->per_device_auto_alloc_size;
+ if (size) {
+ dev->uclass_priv = calloc(1, size);
+ if (!dev->uclass_priv) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ }
+
+ /* Ensure all parents are probed */
+ if (dev->parent) {
+ ret = device_probe(dev->parent);
+ if (ret)
+ goto fail;
+ }
+
+ if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
+ ret = drv->ofdata_to_platdata(dev);
+ if (ret)
+ goto fail;
+ }
+
+ if (drv->probe) {
+ ret = drv->probe(dev);
+ if (ret)
+ goto fail;
+ }
+
+ dev->flags |= DM_FLAG_ACTIVATED;
+
+ ret = uclass_post_probe_device(dev);
+ if (ret) {
+ dev->flags &= ~DM_FLAG_ACTIVATED;
+ goto fail_uclass;
+ }
+
+ return 0;
+fail_uclass:
+ if (device_remove(dev)) {
+ dm_warn("%s: Device '%s' failed to remove on error path\n",
+ __func__, dev->name);
+ }
+fail:
+ device_free(dev);
+
+ return ret;
+}
+
+int device_remove(struct device *dev)
+{
+ struct driver *drv;
+ int ret;
+
+ if (!dev)
+ return -EINVAL;
+
+ if (!(dev->flags & DM_FLAG_ACTIVATED))
+ return 0;
+
+ drv = dev->driver;
+ assert(drv);
+
+ ret = uclass_pre_remove_device(dev);
+ if (ret)
+ return ret;
+
+ ret = device_chld_remove(dev);
+ if (ret)
+ goto err;
+
+ if (drv->remove) {
+ ret = drv->remove(dev);
+ if (ret)
+ goto err_remove;
+ }
+
+ device_free(dev);
+
+ dev->flags &= ~DM_FLAG_ACTIVATED;
+
+ return 0;
+
+err_remove:
+ /* We can't put the children back */
+ dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
+ __func__, dev->name);
+err:
+ ret = uclass_post_probe_device(dev);
+ if (ret) {
+ dm_warn("%s: Device '%s' failed to post_probe on error path\n",
+ __func__, dev->name);
+ }
+
+ return ret;
+}
+
+void *dev_get_platdata(struct device *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device", __func__);
+ return NULL;
+ }
+
+ return dev->platdata;
+}
+
+void *dev_get_priv(struct device *dev)
+{
+ if (!dev) {
+ dm_warn("%s: null device", __func__);
+ return NULL;
+ }
+
+ return dev->priv;
+}
Code Review / kvmfornfv.git / blobdiff