framebuffer.cpp revision d28d7e87f824559a6bfdc4dbdc12b74162557454 
1/*
2 * Copyright (C) 2008 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
17#include <sys/mman.h>
18
19#include <dlfcn.h>
20
21#include <cutils/ashmem.h>
22#include <cutils/log.h>
23
24#include <hardware/hardware.h>
25#include <hardware/gralloc.h>
26
27#include <fcntl.h>
28#include <errno.h>
29#include <sys/ioctl.h>
30#include <string.h>
31#include <stdlib.h>
32
33#include <cutils/log.h>
34#include <cutils/atomic.h>
35
36#if HAVE_ANDROID_OS
37#include <linux/fb.h>
38#endif
39
40#include "gralloc_priv.h"
41
42/*****************************************************************************/
43
44// should be a build option
45#define SUPPORTS_UPDATE_ON_DEMAND   1
46
47// fb_fix_screeninfo::id returned on msm7k
48#define MSM_DEV_FB_ID "msmfb"
49
50// numbers of buffers for page flipping
51#define NUM_BUFFERS 2
52
53
54enum {
55    PAGE_FLIP = 0x00000001,
56    LOCKED = 0x00000002
57};
58
59struct fb_context_t {
60    framebuffer_device_t  device;
61};
62
63/*****************************************************************************/
64
65static int fb_setSwapInterval(struct framebuffer_device_t* dev,
66            int interval)
67{
68    fb_context_t* ctx = (fb_context_t*)dev;
69    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
70        return -EINVAL;
71    // FIXME: implement fb_setSwapInterval
72    return 0;
73}
74
75static int fb_setUpdateRect(struct framebuffer_device_t* dev,
76        int l, int t, int w, int h)
77{
78    if (((w|h) <= 0) || ((l|t)<0))
79        return -EINVAL;
80
81    fb_context_t* ctx = (fb_context_t*)dev;
82    private_module_t* m = reinterpret_cast<private_module_t*>(
83            dev->common.module);
84    m->info.reserved[0] = 0x54445055; // "UPDT";
85    m->info.reserved[1] = (uint16_t)l | ((uint32_t)t << 16);
86    m->info.reserved[2] = (uint16_t)(l+w) | ((uint32_t)(t+h) << 16);
87    return 0;
88}
89
90static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
91{
92    if (private_handle_t::validate(buffer) < 0)
93        return -EINVAL;
94
95    fb_context_t* ctx = (fb_context_t*)dev;
96
97    private_handle_t const* hnd = reinterpret_cast<private_handle_t const*>(buffer);
98    private_module_t* m = reinterpret_cast<private_module_t*>(
99            dev->common.module);
100
101    if (m->currentBuffer) {
102        m->base.unlock(&m->base, m->currentBuffer);
103        m->currentBuffer = 0;
104    }
105
106    if (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
107
108        m->base.lock(&m->base, buffer,
109                private_module_t::PRIV_USAGE_LOCKED_FOR_POST,
110                0, 0, m->info.xres, m->info.yres, NULL);
111
112        const size_t offset = hnd->base - m->framebuffer->base;
113        m->info.activate = FB_ACTIVATE_VBL;
114        m->info.yoffset = offset / m->finfo.line_length;
115        if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
116            LOGE("FBIOPUT_VSCREENINFO failed");
117            m->base.unlock(&m->base, buffer);
118            return -errno;
119        }
120        m->currentBuffer = buffer;
121
122    } else {
123        // If we can't do the page_flip, just copy the buffer to the front
124        // FIXME: use copybit HAL instead of memcpy
125
126        void* fb_vaddr;
127        void* buffer_vaddr;
128
129        m->base.lock(&m->base, m->framebuffer,
130                GRALLOC_USAGE_SW_WRITE_RARELY,
131                0, 0, m->info.xres, m->info.yres,
132                &fb_vaddr);
133
134        m->base.lock(&m->base, buffer,
135                GRALLOC_USAGE_SW_READ_RARELY,
136                0, 0, m->info.xres, m->info.yres,
137                &buffer_vaddr);
138
139        memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
140
141        m->base.unlock(&m->base, buffer);
142        m->base.unlock(&m->base, m->framebuffer);
143    }
144
145    return 0;
146}
147
148/*****************************************************************************/
149
150int mapFrameBufferLocked(struct private_module_t* module)
151{
152    // already initialized...
153    if (module->framebuffer) {
154        return 0;
155    }
156
157    char const * const device_template[] = {
158            "/dev/graphics/fb%u",
159            "/dev/fb%u",
160            0 };
161
162    int fd = -1;
163    int i=0;
164    char name[64];
165
166    while ((fd==-1) && device_template[i]) {
167        snprintf(name, 64, device_template[i], 0);
168        fd = open(name, O_RDWR, 0);
169        i++;
170    }
171    if (fd < 0)
172        return -errno;
173
174    struct fb_fix_screeninfo finfo;
175    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
176        return -errno;
177
178    struct fb_var_screeninfo info;
179    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
180        return -errno;
181
182    info.reserved[0] = 0;
183    info.reserved[1] = 0;
184    info.reserved[2] = 0;
185    info.xoffset = 0;
186    info.yoffset = 0;
187    info.activate = FB_ACTIVATE_NOW;
188
189    /*
190     * Explicitly request 5/6/5
191     */
192    info.bits_per_pixel = 16;
193    info.red.offset     = 11;
194    info.red.length     = 5;
195    info.green.offset   = 5;
196    info.green.length   = 6;
197    info.blue.offset    = 0;
198    info.blue.length    = 5;
199    info.transp.offset  = 0;
200    info.transp.length  = 0;
201
202    /*
203     * Request NUM_BUFFERS screens (at lest 2 for page flipping)
204     */
205    info.yres_virtual = info.yres * NUM_BUFFERS;
206
207
208    uint32_t flags = PAGE_FLIP;
209    if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
210        info.yres_virtual = info.yres;
211        flags &= ~PAGE_FLIP;
212        LOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
213    }
214
215    if (info.yres_virtual < info.yres * 2) {
216        // we need at least 2 for page-flipping
217        info.yres_virtual = info.yres;
218        flags &= ~PAGE_FLIP;
219        LOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
220                info.yres_virtual, info.yres*2);
221    }
222
223    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
224        return -errno;
225
226    int refreshRate = 1000000000000000LLU /
227    (
228            uint64_t( info.upper_margin + info.lower_margin + info.yres )
229            * ( info.left_margin  + info.right_margin + info.xres )
230            * info.pixclock
231    );
232
233    if (refreshRate == 0) {
234        // bleagh, bad info from the driver
235        refreshRate = 60*1000;  // 60 Hz
236    }
237
238    if (int(info.width) <= 0 || int(info.height) <= 0) {
239        // the driver doesn't return that information
240        // default to 160 dpi
241        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
242        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
243    }
244
245    float xdpi = (info.xres * 25.4f) / info.width;
246    float ydpi = (info.yres * 25.4f) / info.height;
247    float fps  = refreshRate / 1000.0f;
248
249    LOGI(   "using (fd=%d)\n"
250            "id           = %s\n"
251            "xres         = %d px\n"
252            "yres         = %d px\n"
253            "xres_virtual = %d px\n"
254            "yres_virtual = %d px\n"
255            "bpp          = %d\n"
256            "r            = %2u:%u\n"
257            "g            = %2u:%u\n"
258            "b            = %2u:%u\n",
259            fd,
260            finfo.id,
261            info.xres,
262            info.yres,
263            info.xres_virtual,
264            info.yres_virtual,
265            info.bits_per_pixel,
266            info.red.offset, info.red.length,
267            info.green.offset, info.green.length,
268            info.blue.offset, info.blue.length
269    );
270
271    LOGI(   "width        = %d mm (%f dpi)\n"
272            "height       = %d mm (%f dpi)\n"
273            "refresh rate = %.2f Hz\n",
274            info.width,  xdpi,
275            info.height, ydpi,
276            fps
277    );
278
279
280    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
281        return -errno;
282
283    if (finfo.smem_len <= 0)
284        return -errno;
285
286
287    module->flags = flags;
288    module->info = info;
289    module->finfo = finfo;
290    module->xdpi = xdpi;
291    module->ydpi = ydpi;
292    module->fps = fps;
293
294    /*
295     * map the framebuffer
296     */
297
298    int err;
299    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
300    module->framebuffer = new private_handle_t(dup(fd), fbSize,
301            private_handle_t::PRIV_FLAGS_USES_PMEM);
302
303    module->numBuffers = info.yres_virtual / info.yres;
304    module->bufferMask = 0;
305
306    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
307    if (vaddr == MAP_FAILED) {
308        LOGE("Error mapping the framebuffer (%s)", strerror(errno));
309        return -errno;
310    }
311    module->framebuffer->base = intptr_t(vaddr);
312    memset(vaddr, 0, fbSize);
313    return 0;
314}
315
316static int mapFrameBuffer(struct private_module_t* module)
317{
318    pthread_mutex_lock(&module->lock);
319    int err = mapFrameBufferLocked(module);
320    pthread_mutex_unlock(&module->lock);
321    return err;
322}
323
324/*****************************************************************************/
325
326static int fb_close(struct hw_device_t *dev)
327{
328    fb_context_t* ctx = (fb_context_t*)dev;
329    if (ctx) {
330        free(ctx);
331    }
332    return 0;
333}
334
335int fb_device_open(hw_module_t const* module, const char* name,
336        hw_device_t** device)
337{
338    int status = -EINVAL;
339    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
340
341        alloc_device_t* gralloc_device;
342        status = gralloc_open(module, &gralloc_device);
343        if (status < 0)
344            return status;
345
346        /* initialize our state here */
347        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
348        memset(dev, 0, sizeof(*dev));
349
350        /* initialize the procs */
351        dev->device.common.tag = HARDWARE_DEVICE_TAG;
352        dev->device.common.version = 0;
353        dev->device.common.module = const_cast<hw_module_t*>(module);
354        dev->device.common.close = fb_close;
355        dev->device.setSwapInterval = fb_setSwapInterval;
356        dev->device.post            = fb_post;
357        dev->device.setUpdateRect = 0;
358
359        private_module_t* m = (private_module_t*)module;
360        status = mapFrameBuffer(m);
361        if (status >= 0) {
362            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
363            const_cast<uint32_t&>(dev->device.flags) = 0;
364            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
365            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
366            const_cast<int&>(dev->device.stride) = stride;
367            const_cast<int&>(dev->device.format) = HAL_PIXEL_FORMAT_RGB_565;
368            const_cast<float&>(dev->device.xdpi) = m->xdpi;
369            const_cast<float&>(dev->device.ydpi) = m->ydpi;
370            const_cast<float&>(dev->device.fps) = m->fps;
371            const_cast<int&>(dev->device.minSwapInterval) = 1;
372            const_cast<int&>(dev->device.maxSwapInterval) = 1;
373
374#if SUPPORTS_UPDATE_ON_DEMAND
375            if (!strcmp(m->finfo.id, MSM_DEV_FB_ID)) {
376                dev->device.setUpdateRect   = fb_setUpdateRect;
377                LOGD("msmfb driver detected, enabling UPDATE_ON_DEMAND");
378            }
379#endif
380
381            *device = &dev->device.common;
382        }
383    }
384    return status;
385}
386