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1 /*
2  * Copyright (C) 2016 The Android Open Source Project
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 #include <sys/mman.h>
17 
18 #include <dlfcn.h>
19 
20 #include <cutils/ashmem.h>
21 #include <cutils/log.h>
22 #include <cutils/properties.h>
23 
24 #include <sys/system_properties.h>
25 
26 #include <hardware/hardware.h>
27 #include <hardware/gralloc.h>
28 
29 #include <fcntl.h>
30 #include <errno.h>
31 #include <sys/ioctl.h>
32 #include <string.h>
33 #include <stdlib.h>
34 
35 #include <cutils/atomic.h>
36 #include <private/android_filesystem_config.h>
37 
38 #if defined(__ANDROID__)
39 #include <linux/fb.h>
40 #endif
41 
42 #include "gralloc_vsoc_priv.h"
43 #include "region_registry.h"
44 
45 #include "common/libs/auto_resources/auto_resources.h"
46 #include "common/libs/threads/cuttlefish_thread.h"
47 #include "common/vsoc/lib/screen_region_view.h"
48 
49 using vsoc::screen::ScreenRegionView;
50 
51 /*****************************************************************************/
52 
53 struct fb_context_t {
54   framebuffer_device_t  device;
55 };
56 
57 /*****************************************************************************/
58 
59 static int fb_setSwapInterval(struct framebuffer_device_t* dev, int interval) {
60   if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval) {
61     return -EINVAL;
62   }
63   // FIXME: implement fb_setSwapInterval
64   return 0;
65 }
66 
67 /*
68  * These functions (and probably the entire framebuffer device) are most likely
69  * not used when the hardware composer device is present, however is hard to be
70  * 100% sure.
71  */
72 static int fb_setUpdateRect(
73     struct framebuffer_device_t* dev __unused, int l, int t, int w, int h) {
74   if (((w|h) <= 0) || ((l|t)<0)) {
75     return -EINVAL;
76   }
77   // TODO(jemoreira): Find a way to broadcast this with the framebuffer control.
78   return 0;
79 }
80 
81 static int fb_post(struct framebuffer_device_t* dev __unused,
82                    buffer_handle_t buffer_handle) {
83   static int frame_buffer_idx = 0;
84 
85   auto screen_view = ScreenRegionView::GetInstance();
86 
87   void* frame_buffer = screen_view->GetBuffer(frame_buffer_idx);
88   const private_handle_t* p_handle =
89       reinterpret_cast<const private_handle_t*>(buffer_handle);
90   void* buffer;
91   int retval =
92       reinterpret_cast<gralloc_module_t*>(dev->common.module)
93           ->lock(reinterpret_cast<const gralloc_module_t*>(dev->common.module),
94                  buffer_handle, GRALLOC_USAGE_SW_READ_OFTEN, 0, 0,
95                  p_handle->x_res, p_handle->y_res, &buffer);
96   if (retval != 0) {
97     ALOGE("Got error code %d from lock function", retval);
98     return -1;
99   }
100   memcpy(frame_buffer, buffer, screen_view->buffer_size());
101   screen_view->BroadcastNewFrame(frame_buffer_idx);
102 
103   frame_buffer_idx = (frame_buffer_idx + 1) % screen_view->number_of_buffers();
104 
105   return 0;
106 }
107 
108 /*****************************************************************************/
109 
110 static int fb_close(struct hw_device_t *dev) {
111   fb_context_t* ctx = (fb_context_t*)dev;
112   if (ctx) {
113     free(ctx);
114   }
115   return 0;
116 }
117 
118 int fb_device_open(
119     hw_module_t const* module, const char* name, hw_device_t** device) {
120   if (strcmp(name, GRALLOC_HARDWARE_FB0) != 0) {
121     return -EINVAL;
122   }
123   /* initialize our state here */
124   fb_context_t* dev = (fb_context_t*) malloc(sizeof(*dev));
125   LOG_FATAL_IF(!dev, "%s: malloc returned NULL.", __FUNCTION__);
126   memset(dev, 0, sizeof(*dev));
127 
128   /* initialize the procs */
129   dev->device.common.tag = HARDWARE_DEVICE_TAG;
130   dev->device.common.version = 0;
131   dev->device.common.module = const_cast<hw_module_t*>(module);
132   dev->device.common.close = fb_close;
133   dev->device.setSwapInterval = fb_setSwapInterval;
134   dev->device.post            = fb_post;
135   dev->device.setUpdateRect   = fb_setUpdateRect;
136 
137   auto screen_view = ScreenRegionView::GetInstance();
138 
139   int stride =
140     screen_view->line_length() / screen_view->bytes_per_pixel();
141   int format = HAL_PIXEL_FORMAT_RGBX_8888;
142   const_cast<uint32_t&>(dev->device.flags) = 0;
143   const_cast<uint32_t&>(dev->device.width) = screen_view->x_res();
144   const_cast<uint32_t&>(dev->device.height) = screen_view->y_res();
145   const_cast<int&>(dev->device.stride) = stride;
146   const_cast<int&>(dev->device.format) = format;
147   const_cast<float&>(dev->device.xdpi) = screen_view->dpi();
148   const_cast<float&>(dev->device.ydpi) = screen_view->dpi();
149   const_cast<float&>(dev->device.fps) =
150     (screen_view->refresh_rate_hz() * 1000) / 1000.0f;
151   const_cast<int&>(dev->device.minSwapInterval) = 1;
152   const_cast<int&>(dev->device.maxSwapInterval) = 1;
153   *device = &dev->device.common;
154 
155   return 0;
156 }
157