1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/core/device.c b/drivers/core/device.c
new file mode 100644
index 0000000000..55ba281be0
--- /dev/null
+++ b/drivers/core/device.c
@@ -0,0 +1,348 @@
+/*
+ * 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;
+}