1/*
2 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <ion.h>
18#include <fcntl.h>
19#include <sys/mman.h>
20#include <sys/ioctl.h>
21#include <cutils/log.h>
22
23typedef unsigned long ion_handle;
24
25struct ion_allocation_data {
26    size_t len;
27    size_t align;
28    unsigned int heap_mask;
29    unsigned int flags;
30    ion_handle handle;
31};
32
33struct ion_fd_data {
34    ion_handle handle;
35    int fd;
36};
37
38struct ion_handle_data {
39    ion_handle handle;
40};
41
42struct ion_custom_data {
43    unsigned int cmd;
44    unsigned long arg;
45};
46
47#define ION_IOC_MAGIC   'I'
48#define ION_IOC_ALLOC   _IOWR(ION_IOC_MAGIC, 0, struct ion_allocation_data)
49#define ION_IOC_FREE    _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
50#define ION_IOC_MAP     _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data)
51#define ION_IOC_SHARE   _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
52#define ION_IOC_IMPORT  _IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data)
53#define ION_IOC_CUSTOM  _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
54#define ION_IOC_SYNC	_IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data)
55
56struct ion_msync_data {
57    long flags;
58    ion_buffer buf;
59    size_t size;
60    off_t offset;
61};
62
63enum ION_EXYNOS_CUSTOM_CMD {
64    ION_EXYNOS_CUSTOM_MSYNC
65};
66
67ion_client ion_client_create(void)
68{
69    return open("/dev/ion", O_RDWR);
70}
71
72void ion_client_destroy(ion_client client)
73{
74    close(client);
75}
76
77ion_buffer ion_alloc(ion_client client, size_t len, size_t align,
78                     unsigned int heap_mask, unsigned int flags)
79{
80    int ret;
81    struct ion_handle_data arg_free;
82    struct ion_fd_data arg_share;
83    struct ion_allocation_data arg_alloc;
84
85    arg_alloc.len = len;
86    arg_alloc.align = align;
87    arg_alloc.heap_mask = heap_mask;
88    arg_alloc.flags = flags;
89
90    ret = ioctl(client, ION_IOC_ALLOC, &arg_alloc);
91    if (ret < 0)
92        return ret;
93
94    arg_share.handle = arg_alloc.handle;
95    ret = ioctl(client, ION_IOC_SHARE, &arg_share);
96
97    arg_free.handle = arg_alloc.handle;
98    ioctl(client, ION_IOC_FREE, &arg_free);
99
100    if (ret < 0)
101        return ret;
102
103    return arg_share.fd;
104}
105
106void ion_free(ion_buffer buffer)
107{
108    close(buffer);
109}
110
111void *ion_map(ion_buffer buffer, size_t len, off_t offset)
112{
113    return mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED,
114                buffer, offset);
115}
116
117int ion_unmap(void *addr, size_t len)
118{
119    return munmap(addr, len);
120}
121
122int ion_sync(ion_client client, ion_buffer buffer)
123{
124    struct ion_fd_data data;
125
126    data.fd = buffer;
127
128    return ioctl(client, ION_IOC_SYNC, &data);
129}
130
131int ion_incRef(int fd, int share_fd, unsigned long **handle)
132{
133    struct ion_fd_data data;
134
135    data.fd = share_fd;
136
137    int ret = ioctl(fd, ION_IOC_IMPORT, &data);
138    if (ret < 0)
139            return ret;
140    *handle = (unsigned long*)(data.handle);
141    return ret;
142}
143
144int ion_decRef(int fd, unsigned long *handle)
145{
146    struct ion_handle_data data;
147    data.handle = (ion_handle)handle;
148
149    return ioctl(fd, ION_IOC_FREE, &data);
150}
151