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// Set TARGET_USE_PAN_DISPLAY to true at compile time if the
46// board uses FBIOPAN_DISPLAY to setup page flipping, otherwise
47// default ioctl to do page-flipping is FBIOPUT_VSCREENINFO.
48#ifndef USE_PAN_DISPLAY
49#define USE_PAN_DISPLAY 0
50#endif
51
52// numbers of buffers for page flipping
53#define NUM_BUFFERS 2
54
55
56enum {
57    PAGE_FLIP = 0x00000001,
58    LOCKED = 0x00000002
59};
60
61struct fb_context_t {
62    framebuffer_device_t  device;
63};
64
65/*****************************************************************************/
66
67static int fb_setSwapInterval(struct framebuffer_device_t* dev,
68            int interval)
69{
70    fb_context_t* ctx = (fb_context_t*)dev;
71    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
72        return -EINVAL;
73    // FIXME: implement fb_setSwapInterval
74    return 0;
75}
76
77static int fb_setUpdateRect(struct framebuffer_device_t* dev,
78        int l, int t, int w, int h)
79{
80    if (((w|h) <= 0) || ((l|t)<0))
81        return -EINVAL;
82
83    fb_context_t* ctx = (fb_context_t*)dev;
84    private_module_t* m = reinterpret_cast<private_module_t*>(
85            dev->common.module);
86    m->info.reserved[0] = 0x54445055; // "UPDT";
87    m->info.reserved[1] = (uint16_t)l | ((uint32_t)t << 16);
88    m->info.reserved[2] = (uint16_t)(l+w) | ((uint32_t)(t+h) << 16);
89    return 0;
90}
91
92static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
93{
94    if (private_handle_t::validate(buffer) < 0)
95        return -EINVAL;
96
97    fb_context_t* ctx = (fb_context_t*)dev;
98
99    private_handle_t const* hnd = reinterpret_cast<private_handle_t const*>(buffer);
100    private_module_t* m = reinterpret_cast<private_module_t*>(
101            dev->common.module);
102
103    if (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
104        const size_t offset = hnd->base - m->framebuffer->base;
105        m->info.activate = FB_ACTIVATE_VBL;
106        m->info.yoffset = offset / m->finfo.line_length;
107        if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
108            ALOGE("FBIOPUT_VSCREENINFO failed");
109            m->base.unlock(&m->base, buffer);
110            return -errno;
111        }
112        m->currentBuffer = buffer;
113
114    } else {
115        // If we can't do the page_flip, just copy the buffer to the front
116        // FIXME: use copybit HAL instead of memcpy
117
118        void* fb_vaddr;
119        void* buffer_vaddr;
120
121        m->base.lock(&m->base, m->framebuffer,
122                GRALLOC_USAGE_SW_WRITE_RARELY,
123                0, 0, m->info.xres, m->info.yres,
124                &fb_vaddr);
125
126        m->base.lock(&m->base, buffer,
127                GRALLOC_USAGE_SW_READ_RARELY,
128                0, 0, m->info.xres, m->info.yres,
129                &buffer_vaddr);
130
131        memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
132
133        m->base.unlock(&m->base, buffer);
134        m->base.unlock(&m->base, m->framebuffer);
135    }
136
137    return 0;
138}
139
140/*****************************************************************************/
141
142int mapFrameBufferLocked(struct private_module_t* module)
143{
144    // already initialized...
145    if (module->framebuffer) {
146        return 0;
147    }
148
149    char const * const device_template[] = {
150            "/dev/graphics/fb%u",
151            "/dev/fb%u",
152            0 };
153
154    int fd = -1;
155    int i=0;
156    char name[64];
157
158    while ((fd==-1) && device_template[i]) {
159        snprintf(name, 64, device_template[i], 0);
160        fd = open(name, O_RDWR, 0);
161        i++;
162    }
163    if (fd < 0)
164        return -errno;
165
166    struct fb_fix_screeninfo finfo;
167    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
168        return -errno;
169
170    struct fb_var_screeninfo info;
171    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
172        return -errno;
173
174    info.reserved[0] = 0;
175    info.reserved[1] = 0;
176    info.reserved[2] = 0;
177    info.xoffset = 0;
178    info.yoffset = 0;
179    info.activate = FB_ACTIVATE_NOW;
180
181    /*
182     * Request NUM_BUFFERS screens (at lest 2 for page flipping)
183     */
184    info.yres_virtual = info.yres * NUM_BUFFERS;
185
186
187    uint32_t flags = PAGE_FLIP;
188#if USE_PAN_DISPLAY
189    if (ioctl(fd, FBIOPAN_DISPLAY, &info) == -1) {
190        ALOGW("FBIOPAN_DISPLAY failed, page flipping not supported");
191#else
192    if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
193        ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
194#endif
195        info.yres_virtual = info.yres;
196        flags &= ~PAGE_FLIP;
197    }
198
199    if (info.yres_virtual < info.yres * 2) {
200        // we need at least 2 for page-flipping
201        info.yres_virtual = info.yres;
202        flags &= ~PAGE_FLIP;
203        ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
204                info.yres_virtual, info.yres*2);
205    }
206
207    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
208        return -errno;
209
210    uint64_t  refreshQuotient =
211    (
212            uint64_t( info.upper_margin + info.lower_margin + info.yres )
213            * ( info.left_margin  + info.right_margin + info.xres )
214            * info.pixclock
215    );
216
217    /* Beware, info.pixclock might be 0 under emulation, so avoid a
218     * division-by-0 here (SIGFPE on ARM) */
219    int refreshRate = refreshQuotient > 0 ? (int)(1000000000000000LLU / refreshQuotient) : 0;
220
221    if (refreshRate == 0) {
222        // bleagh, bad info from the driver
223        refreshRate = 60*1000;  // 60 Hz
224    }
225
226    if (int(info.width) <= 0 || int(info.height) <= 0) {
227        // the driver doesn't return that information
228        // default to 160 dpi
229        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
230        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
231    }
232
233    float xdpi = (info.xres * 25.4f) / info.width;
234    float ydpi = (info.yres * 25.4f) / info.height;
235    float fps  = refreshRate / 1000.0f;
236
237    ALOGI(   "using (fd=%d)\n"
238            "id           = %s\n"
239            "xres         = %d px\n"
240            "yres         = %d px\n"
241            "xres_virtual = %d px\n"
242            "yres_virtual = %d px\n"
243            "bpp          = %d\n"
244            "r            = %2u:%u\n"
245            "g            = %2u:%u\n"
246            "b            = %2u:%u\n",
247            fd,
248            finfo.id,
249            info.xres,
250            info.yres,
251            info.xres_virtual,
252            info.yres_virtual,
253            info.bits_per_pixel,
254            info.red.offset, info.red.length,
255            info.green.offset, info.green.length,
256            info.blue.offset, info.blue.length
257    );
258
259    ALOGI(   "width        = %d mm (%f dpi)\n"
260            "height       = %d mm (%f dpi)\n"
261            "refresh rate = %.2f Hz\n",
262            info.width,  xdpi,
263            info.height, ydpi,
264            fps
265    );
266
267
268    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
269        return -errno;
270
271    if (finfo.smem_len <= 0)
272        return -errno;
273
274
275    module->flags = flags;
276    module->info = info;
277    module->finfo = finfo;
278    module->xdpi = xdpi;
279    module->ydpi = ydpi;
280    module->fps = fps;
281
282    /*
283     * map the framebuffer
284     */
285
286    int err;
287    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
288    module->framebuffer = new private_handle_t(dup(fd), fbSize, 0);
289
290    module->numBuffers = info.yres_virtual / info.yres;
291    module->bufferMask = 0;
292
293    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
294    if (vaddr == MAP_FAILED) {
295        ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
296        return -errno;
297    }
298    module->framebuffer->base = intptr_t(vaddr);
299    memset(vaddr, 0, fbSize);
300    return 0;
301}
302
303static int mapFrameBuffer(struct private_module_t* module)
304{
305    pthread_mutex_lock(&module->lock);
306    int err = mapFrameBufferLocked(module);
307    pthread_mutex_unlock(&module->lock);
308    return err;
309}
310
311/*****************************************************************************/
312
313static int fb_close(struct hw_device_t *dev)
314{
315    fb_context_t* ctx = (fb_context_t*)dev;
316    if (ctx) {
317        free(ctx);
318    }
319    return 0;
320}
321
322int fb_device_open(hw_module_t const* module, const char* name,
323        hw_device_t** device)
324{
325    int status = -EINVAL;
326    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
327        /* initialize our state here */
328        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
329        memset(dev, 0, sizeof(*dev));
330
331        /* initialize the procs */
332        dev->device.common.tag = HARDWARE_DEVICE_TAG;
333        dev->device.common.version = 0;
334        dev->device.common.module = const_cast<hw_module_t*>(module);
335        dev->device.common.close = fb_close;
336        dev->device.setSwapInterval = fb_setSwapInterval;
337        dev->device.post            = fb_post;
338        dev->device.setUpdateRect = 0;
339
340        private_module_t* m = (private_module_t*)module;
341        status = mapFrameBuffer(m);
342        if (status >= 0) {
343            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
344            int format = (m->info.bits_per_pixel == 32)
345                         ? (m->info.red.offset ? HAL_PIXEL_FORMAT_BGRA_8888 : HAL_PIXEL_FORMAT_RGBX_8888)
346                         : HAL_PIXEL_FORMAT_RGB_565;
347            const_cast<uint32_t&>(dev->device.flags) = 0;
348            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
349            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
350            const_cast<int&>(dev->device.stride) = stride;
351            const_cast<int&>(dev->device.format) = format;
352            const_cast<float&>(dev->device.xdpi) = m->xdpi;
353            const_cast<float&>(dev->device.ydpi) = m->ydpi;
354            const_cast<float&>(dev->device.fps) = m->fps;
355            const_cast<int&>(dev->device.minSwapInterval) = 1;
356            const_cast<int&>(dev->device.maxSwapInterval) = 1;
357            *device = &dev->device.common;
358        }
359    }
360    return status;
361}
362