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#include "gr.h"
42
43/*****************************************************************************/
44
45// numbers of buffers for page flipping
46#define NUM_BUFFERS 2
47
48
49enum {
50    PAGE_FLIP = 0x00000001,
51    LOCKED = 0x00000002
52};
53
54struct fb_context_t {
55    framebuffer_device_t  device;
56};
57
58/*****************************************************************************/
59
60static int fb_setSwapInterval(struct framebuffer_device_t* dev,
61            int interval)
62{
63    fb_context_t* ctx = (fb_context_t*)dev;
64    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
65        return -EINVAL;
66    // FIXME: implement fb_setSwapInterval
67    return 0;
68}
69
70static int fb_setUpdateRect(struct framebuffer_device_t* dev,
71        int l, int t, int w, int h)
72{
73    if (((w|h) <= 0) || ((l|t)<0))
74        return -EINVAL;
75
76    fb_context_t* ctx = (fb_context_t*)dev;
77    private_module_t* m = reinterpret_cast<private_module_t*>(
78            dev->common.module);
79    m->info.reserved[0] = 0x54445055; // "UPDT";
80    m->info.reserved[1] = (uint16_t)l | ((uint32_t)t << 16);
81    m->info.reserved[2] = (uint16_t)(l+w) | ((uint32_t)(t+h) << 16);
82    return 0;
83}
84
85static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
86{
87    if (private_handle_t::validate(buffer) < 0)
88        return -EINVAL;
89
90    fb_context_t* ctx = (fb_context_t*)dev;
91
92    private_handle_t const* hnd = reinterpret_cast<private_handle_t const*>(buffer);
93    private_module_t* m = reinterpret_cast<private_module_t*>(
94            dev->common.module);
95
96    if (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
97        const size_t offset = hnd->base - m->framebuffer->base;
98        m->info.activate = FB_ACTIVATE_VBL;
99        m->info.yoffset = offset / m->finfo.line_length;
100        if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
101            ALOGE("FBIOPUT_VSCREENINFO failed");
102            m->base.unlock(&m->base, buffer);
103            return -errno;
104        }
105        m->currentBuffer = buffer;
106
107    } else {
108        // If we can't do the page_flip, just copy the buffer to the front
109        // FIXME: use copybit HAL instead of memcpy
110
111        void* fb_vaddr;
112        void* buffer_vaddr;
113
114        m->base.lock(&m->base, m->framebuffer,
115                GRALLOC_USAGE_SW_WRITE_RARELY,
116                0, 0, m->info.xres, m->info.yres,
117                &fb_vaddr);
118
119        m->base.lock(&m->base, buffer,
120                GRALLOC_USAGE_SW_READ_RARELY,
121                0, 0, m->info.xres, m->info.yres,
122                &buffer_vaddr);
123
124        memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
125
126        m->base.unlock(&m->base, buffer);
127        m->base.unlock(&m->base, m->framebuffer);
128    }
129
130    return 0;
131}
132
133/*****************************************************************************/
134
135int mapFrameBufferLocked(struct private_module_t* module)
136{
137    // already initialized...
138    if (module->framebuffer) {
139        return 0;
140    }
141
142    char const * const device_template[] = {
143            "/dev/graphics/fb%u",
144            "/dev/fb%u",
145            0 };
146
147    int fd = -1;
148    int i=0;
149    char name[64];
150
151    while ((fd==-1) && device_template[i]) {
152        snprintf(name, 64, device_template[i], 0);
153        fd = open(name, O_RDWR, 0);
154        i++;
155    }
156    if (fd < 0)
157        return -errno;
158
159    struct fb_fix_screeninfo finfo;
160    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
161        return -errno;
162
163    struct fb_var_screeninfo info;
164    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
165        return -errno;
166
167    info.reserved[0] = 0;
168    info.reserved[1] = 0;
169    info.reserved[2] = 0;
170    info.xoffset = 0;
171    info.yoffset = 0;
172    info.activate = FB_ACTIVATE_NOW;
173
174    /*
175     * Request NUM_BUFFERS screens (at lest 2 for page flipping)
176     */
177    info.yres_virtual = info.yres * NUM_BUFFERS;
178
179
180    uint32_t flags = PAGE_FLIP;
181    if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
182        info.yres_virtual = info.yres;
183        flags &= ~PAGE_FLIP;
184        ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
185    }
186
187    if (info.yres_virtual < info.yres * 2) {
188        // we need at least 2 for page-flipping
189        info.yres_virtual = info.yres;
190        flags &= ~PAGE_FLIP;
191        ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
192                info.yres_virtual, info.yres*2);
193    }
194
195    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
196        return -errno;
197
198    uint64_t  refreshQuotient =
199    (
200            uint64_t( info.upper_margin + info.lower_margin + info.yres )
201            * ( info.left_margin  + info.right_margin + info.xres )
202            * info.pixclock
203    );
204
205    /* Beware, info.pixclock might be 0 under emulation, so avoid a
206     * division-by-0 here (SIGFPE on ARM) */
207    int refreshRate = refreshQuotient > 0 ? (int)(1000000000000000LLU / refreshQuotient) : 0;
208
209    if (refreshRate == 0) {
210        // bleagh, bad info from the driver
211        refreshRate = 60*1000;  // 60 Hz
212    }
213
214    if (int(info.width) <= 0 || int(info.height) <= 0) {
215        // the driver doesn't return that information
216        // default to 160 dpi
217        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
218        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
219    }
220
221    float xdpi = (info.xres * 25.4f) / info.width;
222    float ydpi = (info.yres * 25.4f) / info.height;
223    float fps  = refreshRate / 1000.0f;
224
225    ALOGI(   "using (fd=%d)\n"
226            "id           = %s\n"
227            "xres         = %d px\n"
228            "yres         = %d px\n"
229            "xres_virtual = %d px\n"
230            "yres_virtual = %d px\n"
231            "bpp          = %d\n"
232            "r            = %2u:%u\n"
233            "g            = %2u:%u\n"
234            "b            = %2u:%u\n",
235            fd,
236            finfo.id,
237            info.xres,
238            info.yres,
239            info.xres_virtual,
240            info.yres_virtual,
241            info.bits_per_pixel,
242            info.red.offset, info.red.length,
243            info.green.offset, info.green.length,
244            info.blue.offset, info.blue.length
245    );
246
247    ALOGI(   "width        = %d mm (%f dpi)\n"
248            "height       = %d mm (%f dpi)\n"
249            "refresh rate = %.2f Hz\n",
250            info.width,  xdpi,
251            info.height, ydpi,
252            fps
253    );
254
255
256    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
257        return -errno;
258
259    if (finfo.smem_len <= 0)
260        return -errno;
261
262
263    module->flags = flags;
264    module->info = info;
265    module->finfo = finfo;
266    module->xdpi = xdpi;
267    module->ydpi = ydpi;
268    module->fps = fps;
269
270    /*
271     * map the framebuffer
272     */
273
274    int err;
275    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
276    module->framebuffer = new private_handle_t(dup(fd), fbSize, 0);
277
278    module->numBuffers = info.yres_virtual / info.yres;
279    module->bufferMask = 0;
280
281    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
282    if (vaddr == MAP_FAILED) {
283        ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
284        return -errno;
285    }
286    module->framebuffer->base = intptr_t(vaddr);
287    memset(vaddr, 0, fbSize);
288    return 0;
289}
290
291static int mapFrameBuffer(struct private_module_t* module)
292{
293    pthread_mutex_lock(&module->lock);
294    int err = mapFrameBufferLocked(module);
295    pthread_mutex_unlock(&module->lock);
296    return err;
297}
298
299/*****************************************************************************/
300
301static int fb_close(struct hw_device_t *dev)
302{
303    fb_context_t* ctx = (fb_context_t*)dev;
304    if (ctx) {
305        free(ctx);
306    }
307    return 0;
308}
309
310int fb_device_open(hw_module_t const* module, const char* name,
311        hw_device_t** device)
312{
313    int status = -EINVAL;
314    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
315        alloc_device_t* gralloc_device;
316        status = gralloc_open(module, &gralloc_device);
317        if (status < 0)
318            return status;
319
320        /* initialize our state here */
321        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
322        memset(dev, 0, sizeof(*dev));
323
324        /* initialize the procs */
325        dev->device.common.tag = HARDWARE_DEVICE_TAG;
326        dev->device.common.version = 0;
327        dev->device.common.module = const_cast<hw_module_t*>(module);
328        dev->device.common.close = fb_close;
329        dev->device.setSwapInterval = fb_setSwapInterval;
330        dev->device.post            = fb_post;
331        dev->device.setUpdateRect = 0;
332
333        private_module_t* m = (private_module_t*)module;
334        status = mapFrameBuffer(m);
335        if (status >= 0) {
336            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
337            int format = (m->info.bits_per_pixel == 32)
338                         ? HAL_PIXEL_FORMAT_RGBX_8888
339                         : HAL_PIXEL_FORMAT_RGB_565;
340            const_cast<uint32_t&>(dev->device.flags) = 0;
341            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
342            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
343            const_cast<int&>(dev->device.stride) = stride;
344            const_cast<int&>(dev->device.format) = format;
345            const_cast<float&>(dev->device.xdpi) = m->xdpi;
346            const_cast<float&>(dev->device.ydpi) = m->ydpi;
347            const_cast<float&>(dev->device.fps) = m->fps;
348            const_cast<int&>(dev->device.minSwapInterval) = 1;
349            const_cast<int&>(dev->device.maxSwapInterval) = 1;
350            *device = &dev->device.common;
351        }
352    }
353    return status;
354}
355