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// SPDX-License-Identifier: GPL-2.0-only
#include <common.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <malloc.h>
#include <envfs.h>
#include <fs.h>
static LIST_HEAD(sbu_list);
struct sbu {
char *uuid;
struct device *dev;
struct cdev *rcdev;
struct cdev cdev;
struct list_head list;
};
void storage_by_uuid_check_exist(struct cdev *cdev);
static ssize_t sbu_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
{
struct sbu *sbu = cdev->priv;
return cdev_read(sbu->rcdev, buf, count, offset, flags);
}
static ssize_t sbu_write(struct cdev *cdev, const void *buf, size_t count, loff_t offset, ulong flags)
{
struct sbu *sbu = cdev->priv;
return cdev_write(sbu->rcdev, buf, count, offset, flags);
}
static int sbu_ioctl(struct cdev *cdev, int request, void *buf)
{
struct sbu *sbu = cdev->priv;
return cdev_ioctl(sbu->rcdev, request, buf);
}
static int sbu_open(struct cdev *cdev, unsigned long flags)
{
struct sbu *sbu = cdev->priv;
return cdev_open(sbu->rcdev, flags);
}
static int sbu_close(struct cdev *cdev)
{
struct sbu *sbu = cdev->priv;
cdev_close(sbu->rcdev);
return 0;
}
static int sbu_flush(struct cdev *cdev)
{
struct sbu *sbu = cdev->priv;
return cdev_flush(sbu->rcdev);
}
static int sbu_erase(struct cdev *cdev, loff_t count, loff_t offset)
{
struct sbu *sbu = cdev->priv;
return cdev_erase(sbu->rcdev, count, offset);
}
static int sbu_protect(struct cdev *cdev, size_t count, loff_t offset, int prot)
{
struct sbu *sbu = cdev->priv;
return cdev_protect(sbu->rcdev, count, offset, prot);
}
static int sbu_discard_range(struct cdev *cdev, loff_t count, loff_t offset)
{
struct sbu *sbu = cdev->priv;
return cdev_discard_range(sbu->rcdev, count, offset);
}
static int sbu_memmap(struct cdev *cdev, void **map, int flags)
{
struct sbu *sbu = cdev->priv;
return cdev_memmap(sbu->rcdev, map, flags);
}
static int sbu_truncate(struct cdev *cdev, size_t size)
{
struct sbu *sbu = cdev->priv;
return cdev_truncate(sbu->rcdev, size);
}
static struct cdev_operations sbu_ops = {
.read = sbu_read,
.write = sbu_write,
.ioctl = sbu_ioctl,
.open = sbu_open,
.close = sbu_close,
.flush = sbu_flush,
.erase = sbu_erase,
.protect = sbu_protect,
.discard_range = sbu_discard_range,
.memmap = sbu_memmap,
.truncate = sbu_truncate,
};
static void storage_by_uuid_add_partitions(struct sbu *sbu, struct cdev *rcdev)
{
int ret;
if (sbu->rcdev)
return;
sbu->rcdev = rcdev;
sbu->cdev.name = sbu->uuid;
sbu->cdev.size = rcdev->size;
sbu->cdev.ops = &sbu_ops;
sbu->cdev.dev = sbu->dev;
sbu->cdev.priv = sbu;
ret = devfs_create(&sbu->cdev);
if (ret) {
dev_err(sbu->dev, "Failed to create cdev: %s\n", strerror(-ret));
return;
}
of_parse_partitions(&sbu->cdev, sbu->dev->of_node);
}
static void check_exist(struct sbu *sbu)
{
struct cdev *cdev;
for_each_cdev(cdev) {
if (!strcmp(cdev->diskuuid, sbu->uuid)) {
dev_dbg(sbu->dev, "Found %s %s\n", cdev->name, cdev->diskuuid);
storage_by_uuid_add_partitions(sbu, cdev);
}
}
}
static int sbu_detect(struct device *dev)
{
struct sbu *sbu = dev->priv;
dev_dbg(dev, "%s\n", __func__);
check_exist(sbu);
return 0;
}
static int storage_by_uuid_probe(struct device *dev)
{
struct sbu *sbu;
int ret;
const char *uuid;
sbu = xzalloc(sizeof(*sbu));
ret = of_property_read_string(dev->of_node, "uuid", &uuid);
if (ret)
return ret;
sbu->dev = dev;
sbu->uuid = xstrdup(uuid);
list_add_tail(&sbu->list, &sbu_list);
check_exist(sbu);
dev->priv = sbu;
dev->detect = sbu_detect;
return 0;
}
static struct of_device_id storage_by_uuid_dt_ids[] = {
{
.compatible = "barebox,storage-by-uuid",
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, storage_by_uuid_dt_ids);
static struct driver storage_by_uuid_driver = {
.name = "storage-by-uuid",
.probe = storage_by_uuid_probe,
.of_compatible = storage_by_uuid_dt_ids,
};
device_platform_driver(storage_by_uuid_driver);
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