u-boot/drivers/core/device.c
Heiko Schocher 54c5d08a09 dm: rename device struct to udevice
using UBI and DM together leads in compiler error, as
both define a "struct device", so rename "struct device"
in include/dm/device.h to "struct udevice", as we use
linux code (MTD/UBI/UBIFS some USB code,...) and cannot
change the linux "struct device"

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Marek Vasut <marex@denx.de>
2014-05-27 10:21:32 -04:00

348 lines
6.3 KiB
C

/*
* 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 udevice *dev)
{
struct udevice *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 udevice *dev)
{
struct udevice *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 udevice *parent, struct driver *drv, const char *name,
void *platdata, int of_offset, struct udevice **devp)
{
struct udevice *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 udevice));
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 udevice *parent, const struct driver_info *info,
struct udevice **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 udevice *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 udevice *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 udevice *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 udevice *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 udevice *dev)
{
if (!dev) {
dm_warn("%s: null device", __func__);
return NULL;
}
return dev->platdata;
}
void *dev_get_priv(struct udevice *dev)
{
if (!dev) {
dm_warn("%s: null device", __func__);
return NULL;
}
return dev->priv;
}