Add ion helper library
This library contains helper functions for using ion
Change-Id: I7d7f76d6d3f36cd94d67797a38099a94214392b1
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
diff --git a/libion/ion.c b/libion/ion.c
new file mode 100644
index 0000000..dbeac23
--- /dev/null
+++ b/libion/ion.c
@@ -0,0 +1,134 @@
+/*
+ * ion.c
+ *
+ * Memory Allocator functions for ion
+ *
+ * Copyright 2011 Google, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#define LOG_TAG "ion"
+
+#include <cutils/log.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <linux/ion.h>
+#include <ion/ion.h>
+
+int ion_open()
+{
+ int fd = open("/dev/ion", O_RDWR);
+ if (fd < 0)
+ ALOGE("open /dev/ion failed!\n");
+ return fd;
+}
+
+int ion_close(int fd)
+{
+ return close(fd);
+}
+
+static int ion_ioctl(int fd, int req, void *arg)
+{
+ int ret = ioctl(fd, req, arg);
+ if (ret < 0) {
+ ALOGE("ioctl %x failed with code %d: %s\n", req,
+ ret, strerror(errno));
+ return -errno;
+ }
+ return ret;
+}
+
+int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
+ struct ion_handle **handle)
+{
+ int ret;
+ struct ion_allocation_data data = {
+ .len = len,
+ .align = align,
+ .flags = flags,
+ };
+
+ ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
+ if (ret < 0)
+ return ret;
+ *handle = data.handle;
+ return ret;
+}
+
+int ion_free(int fd, struct ion_handle *handle)
+{
+ struct ion_handle_data data = {
+ .handle = handle,
+ };
+ return ion_ioctl(fd, ION_IOC_FREE, &data);
+}
+
+int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
+ int flags, off_t offset, unsigned char **ptr, int *map_fd)
+{
+ struct ion_fd_data data = {
+ .handle = handle,
+ };
+
+ int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
+ if (ret < 0)
+ return ret;
+ *map_fd = data.fd;
+ if (*map_fd < 0) {
+ ALOGE("map ioctl returned negative fd\n");
+ return -EINVAL;
+ }
+ *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
+ if (*ptr == MAP_FAILED) {
+ ALOGE("mmap failed: %s\n", strerror(errno));
+ return -errno;
+ }
+ return ret;
+}
+
+int ion_share(int fd, struct ion_handle *handle, int *share_fd)
+{
+ int map_fd;
+ struct ion_fd_data data = {
+ .handle = handle,
+ };
+
+ int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
+ if (ret < 0)
+ return ret;
+ *share_fd = data.fd;
+ if (*share_fd < 0) {
+ ALOGE("share ioctl returned negative fd\n");
+ return -EINVAL;
+ }
+ return ret;
+}
+
+int ion_import(int fd, int share_fd, struct ion_handle **handle)
+{
+ struct ion_fd_data data = {
+ .fd = share_fd,
+ };
+
+ int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
+ if (ret < 0)
+ return ret;
+ *handle = data.handle;
+ return ret;
+}