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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "py/binary.h"
#include "py/objarray.h"
#include "py/mperrno.h"
#include "extmod/vfs.h"
#if MICROPY_VFS
void mp_vfs_blockdev_init(mp_vfs_blockdev_t *self, mp_obj_t bdev) {
mp_load_method(bdev, MP_QSTR_readblocks, self->readblocks);
mp_load_method_maybe(bdev, MP_QSTR_writeblocks, self->writeblocks);
mp_load_method_maybe(bdev, MP_QSTR_ioctl, self->u.ioctl);
if (self->u.ioctl[0] != MP_OBJ_NULL) {
// Device supports new block protocol, so indicate it
self->flags |= MP_BLOCKDEV_FLAG_HAVE_IOCTL;
} else {
// No ioctl method, so assume the device uses the old block protocol
mp_load_method_maybe(bdev, MP_QSTR_sync, self->u.old.sync);
mp_load_method(bdev, MP_QSTR_count, self->u.old.count);
}
}
// Helper function to minimise code size of read/write functions
// note the n_args argument is moved to the end for further code size reduction (args keep same position in caller and callee).
static int mp_vfs_blockdev_call_rw(mp_obj_t *args, size_t block_num, size_t block_off, size_t len, void *buf, size_t n_args) {
#if MICROPY_PY_BUILTINS_MEMORYVIEW
mp_obj_array_t ar = {{&mp_type_memoryview}, 'B' | MP_OBJ_ARRAY_TYPECODE_FLAG_RW, 0, len, buf};
#else
mp_obj_array_t ar = {{&mp_type_bytearray}, BYTEARRAY_TYPECODE, 0, len, buf};
#endif
args[2] = MP_OBJ_NEW_SMALL_INT(block_num);
args[3] = MP_OBJ_FROM_PTR(&ar);
args[4] = MP_OBJ_NEW_SMALL_INT(block_off); // ignored for n_args == 2
mp_obj_t ret = mp_call_method_n_kw(n_args, 0, args);
if (ret == mp_const_none) {
return 0;
} else {
// Block device functions are expected to return 0 on success
// and negative integer on errors. Check for positive integer
// results as some callers (i.e. littlefs) will produce corrupt
// results from these.
int i = mp_obj_get_int(ret);
return i > 0 ? (-MP_EINVAL) : i;
}
}
int mp_vfs_blockdev_read(mp_vfs_blockdev_t *self, size_t block_num, size_t num_blocks, uint8_t *buf) {
#if MICROPY_VFS_BLOCKDEV_NATIVE
if (self->flags & MP_BLOCKDEV_FLAG_NATIVE) {
mp_vfs_blockdev_native_readblocks f = (void *)(uintptr_t)self->readblocks[2];
return f(buf, block_num, num_blocks);
}
#endif
return mp_vfs_blockdev_call_rw(self->readblocks, block_num, 0, num_blocks * self->block_size, buf, 2);
}
int mp_vfs_blockdev_read_ext(mp_vfs_blockdev_t *self, size_t block_num, size_t block_off, size_t len, uint8_t *buf) {
return mp_vfs_blockdev_call_rw(self->readblocks, block_num, block_off, len, buf, 3);
}
int mp_vfs_blockdev_write(mp_vfs_blockdev_t *self, size_t block_num, size_t num_blocks, const uint8_t *buf) {
if (self->writeblocks[0] == MP_OBJ_NULL) {
// read-only block device
return -MP_EROFS;
}
#if MICROPY_VFS_BLOCKDEV_NATIVE
if (self->flags & MP_BLOCKDEV_FLAG_NATIVE) {
mp_vfs_blockdev_native_writeblocks f = (void *)(uintptr_t)self->writeblocks[2];
return f(buf, block_num, num_blocks);
}
#endif
return mp_vfs_blockdev_call_rw(self->writeblocks, block_num, 0, num_blocks * self->block_size, (void *)buf, 2);
}
int mp_vfs_blockdev_write_ext(mp_vfs_blockdev_t *self, size_t block_num, size_t block_off, size_t len, const uint8_t *buf) {
if (self->writeblocks[0] == MP_OBJ_NULL) {
// read-only block device
return -MP_EROFS;
}
return mp_vfs_blockdev_call_rw(self->writeblocks, block_num, block_off, len, (void *)buf, 3);
}
mp_obj_t mp_vfs_blockdev_ioctl(mp_vfs_blockdev_t *self, uintptr_t cmd, uintptr_t arg) {
if (self->flags & MP_BLOCKDEV_FLAG_HAVE_IOCTL) {
// New protocol with ioctl
self->u.ioctl[2] = MP_OBJ_NEW_SMALL_INT(cmd);
self->u.ioctl[3] = MP_OBJ_NEW_SMALL_INT(arg);
return mp_call_method_n_kw(2, 0, self->u.ioctl);
} else {
// Old protocol with sync and count
switch (cmd) {
case MP_BLOCKDEV_IOCTL_SYNC:
if (self->u.old.sync[0] != MP_OBJ_NULL) {
mp_call_method_n_kw(0, 0, self->u.old.sync);
}
break;
case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
return mp_call_method_n_kw(0, 0, self->u.old.count);
case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
// Old protocol has fixed sector size of 512 bytes
break;
case MP_BLOCKDEV_IOCTL_INIT:
// Old protocol doesn't have init
break;
}
return mp_const_none;
}
}
#endif // MICROPY_VFS