| /* |
| * Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "dev.h" |
| |
| #include <assert.h> |
| #include <glib.h> |
| |
| #include "util.h" |
| |
| enum { |
| FLAG_OPEN = 1 |
| }; |
| |
| struct dev { |
| struct dev_ops *ops; |
| void *priv; |
| int flags; |
| }; |
| |
| static int dev_is_open(struct dev *dev) |
| { |
| return dev->flags & FLAG_OPEN; |
| } |
| |
| struct dev *dev_new(struct dev_ops *ops, void *priv) |
| { |
| assert(ops); |
| |
| struct dev *dev = g_slice_new(struct dev); |
| dev->ops = ops; |
| dev->priv = priv; |
| dev->flags = 0; |
| |
| return dev; |
| } |
| |
| void dev_destroy(struct dev *dev) |
| { |
| assert(dev); |
| assert(!dev_is_open(dev)); |
| assert(dev->ops->destroy); |
| |
| dev->ops->destroy(dev); |
| |
| g_slice_free(struct dev, dev); |
| } |
| |
| void *dev_priv(struct dev *dev) |
| { |
| assert(dev); |
| return dev->priv; |
| } |
| |
| int dev_open(struct dev *dev) |
| { |
| assert(dev); |
| assert(!dev_is_open(dev)); |
| assert(dev->ops->open); |
| |
| int result = dev->ops->open(dev); |
| |
| if (result == 0) |
| dev->flags |= FLAG_OPEN; |
| |
| return result; |
| } |
| |
| int dev_read(struct dev *dev, void *buf, size_t len) |
| { |
| assert(dev); |
| assert(dev_is_open(dev)); |
| assert(dev->ops->read); |
| |
| return dev->ops->read(dev, buf, len); |
| } |
| |
| int dev_write(struct dev *dev, const void *buf, size_t len) |
| { |
| assert(dev); |
| assert(dev_is_open(dev)); |
| assert(dev->ops->write); |
| |
| return dev->ops->write(dev, buf, len); |
| } |
| |
| int dev_close(struct dev *dev) |
| { |
| assert(dev); |
| assert(dev_is_open(dev)); |
| assert(dev->ops->close); |
| |
| int result = dev->ops->close(dev); |
| |
| if (result == 0) |
| dev->flags &= ~FLAG_OPEN; |
| |
| return result; |
| } |