#include <lunaix/device.h>
#include <lunaix/mm/page.h>

static int
__null_wr_pg(struct device* dev, void* buf, size_t offset)
{
    // do nothing
    return PG_SIZE;
}

static int
__null_wr(struct device* dev, void* buf, size_t offset, size_t len)
{
    // do nothing
    return len;
}

static int
__null_rd_pg(struct device* dev, void* buf, size_t offset)
{
    // do nothing
    return 0;
}

static int
__null_rd(struct device* dev, void* buf, size_t offset, size_t len)
{
    // do nothing
    return 0;
}

static int
pdev_nulldev_init(struct device_def* def)
{
    struct device* devnull = device_allocseq(NULL, NULL);
    devnull->ops.write_page = __null_wr_pg;
    devnull->ops.write = __null_wr;
    devnull->ops.read_page = __null_rd_pg;
    devnull->ops.read = __null_rd;

    register_device(devnull, &def->class, "null");

    return 0;
}

static struct device_def devnull_def = {
    .name = "null",
    .class = DEVCLASSV(DEVIF_NON, DEVFN_PSEUDO, DEV_NULL, DEV_BUILTIN_NULL),
    .init = pdev_nulldev_init};
EXPORT_DEVICE(nulldev, &devnull_def, load_onboot);