1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * Copyright (c) 2010-2014 The Linux Foundation. All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <sys/mman.h>
19
20#include <cutils/log.h>
21#include <cutils/properties.h>
22#include <dlfcn.h>
23
24#include <hardware/hardware.h>
25
26#include <fcntl.h>
27#include <errno.h>
28#include <sys/ioctl.h>
29#include <string.h>
30#include <stdlib.h>
31#include <pthread.h>
32#include <cutils/atomic.h>
33
34#include <linux/fb.h>
35#include <linux/msm_mdp.h>
36
37#include <GLES/gl.h>
38
39#include "gralloc_priv.h"
40#include "fb_priv.h"
41#include "gr.h"
42#include <cutils/properties.h>
43#include <profiler.h>
44
45#define EVEN_OUT(x) if (x & 0x0001) {x--;}
46/** min of int a, b */
47static inline int min(int a, int b) {
48    return (a<b) ? a : b;
49}
50/** max of int a, b */
51static inline int max(int a, int b) {
52    return (a>b) ? a : b;
53}
54
55enum {
56    PAGE_FLIP = 0x00000001,
57};
58
59struct fb_context_t {
60    framebuffer_device_t  device;
61};
62
63
64static int fb_setSwapInterval(struct framebuffer_device_t* dev,
65                              int interval)
66{
67#ifdef DEBUG_SWAPINTERVAL
68    //XXX: Get the value here and implement along with
69    //single vsync in HWC
70    char pval[PROPERTY_VALUE_MAX];
71    property_get("debug.egl.swapinterval", pval, "-1");
72    int property_interval = atoi(pval);
73    if (property_interval >= 0)
74        interval = property_interval;
75#endif
76
77    private_module_t* m = reinterpret_cast<private_module_t*>(
78        dev->common.module);
79    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
80        return -EINVAL;
81
82    m->swapInterval = interval;
83    return 0;
84}
85
86static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
87{
88    private_module_t* m =
89        reinterpret_cast<private_module_t*>(dev->common.module);
90    private_handle_t *hnd = static_cast<private_handle_t*>
91        (const_cast<native_handle_t*>(buffer));
92    const size_t offset = hnd->base - m->framebuffer->base;
93    m->info.activate = FB_ACTIVATE_VBL;
94    m->info.yoffset = (int)(offset / m->finfo.line_length);
95    if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
96        ALOGE("%s: FBIOPUT_VSCREENINFO for primary failed, str: %s",
97                __FUNCTION__, strerror(errno));
98        return -errno;
99    }
100    return 0;
101}
102
103static int fb_compositionComplete(struct framebuffer_device_t* dev)
104{
105    // TODO: Properly implement composition complete callback
106    if(!dev) {
107        return -1;
108    }
109    glFinish();
110
111    return 0;
112}
113
114int mapFrameBufferLocked(struct private_module_t* module)
115{
116    // already initialized...
117    if (module->framebuffer) {
118        return 0;
119    }
120    char const * const device_template[] = {
121        "/dev/graphics/fb%u",
122        "/dev/fb%u",
123        0 };
124
125    int fd = -1;
126    int i=0;
127    char name[64];
128    char property[PROPERTY_VALUE_MAX];
129
130    while ((fd==-1) && device_template[i]) {
131        snprintf(name, 64, device_template[i], 0);
132        fd = open(name, O_RDWR, 0);
133        i++;
134    }
135    if (fd < 0)
136        return -errno;
137
138    memset(&module->commit, 0, sizeof(struct mdp_display_commit));
139
140    struct fb_fix_screeninfo finfo;
141    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1) {
142        close(fd);
143        return -errno;
144    }
145
146    struct fb_var_screeninfo info;
147    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1) {
148        close(fd);
149        return -errno;
150    }
151
152    info.reserved[0] = 0;
153    info.reserved[1] = 0;
154    info.reserved[2] = 0;
155    info.xoffset = 0;
156    info.yoffset = 0;
157    info.activate = FB_ACTIVATE_NOW;
158
159    /* Interpretation of offset for color fields: All offsets are from the
160     * right, inside a "pixel" value, which is exactly 'bits_per_pixel' wide
161     * (means: you can use the offset as right argument to <<). A pixel
162     * afterwards is a bit stream and is written to video memory as that
163     * unmodified. This implies big-endian byte order if bits_per_pixel is
164     * greater than 8.
165     */
166
167    if(info.bits_per_pixel == 32) {
168        /*
169         * Explicitly request RGBA_8888
170         */
171        info.bits_per_pixel = 32;
172        info.red.offset     = 24;
173        info.red.length     = 8;
174        info.green.offset   = 16;
175        info.green.length   = 8;
176        info.blue.offset    = 8;
177        info.blue.length    = 8;
178        info.transp.offset  = 0;
179        info.transp.length  = 8;
180
181        /* Note: the GL driver does not have a r=8 g=8 b=8 a=0 config, so if we
182         * do not use the MDP for composition (i.e. hw composition == 0), ask
183         * for RGBA instead of RGBX. */
184        if (property_get("debug.sf.hw", property, NULL) > 0 &&
185                                                           atoi(property) == 0)
186            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
187        else if(property_get("debug.composition.type", property, NULL) > 0 &&
188                (strncmp(property, "mdp", 3) == 0))
189            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
190        else
191            module->fbFormat = HAL_PIXEL_FORMAT_RGBA_8888;
192    } else {
193        /*
194         * Explicitly request 5/6/5
195         */
196        info.bits_per_pixel = 16;
197        info.red.offset     = 11;
198        info.red.length     = 5;
199        info.green.offset   = 5;
200        info.green.length   = 6;
201        info.blue.offset    = 0;
202        info.blue.length    = 5;
203        info.transp.offset  = 0;
204        info.transp.length  = 0;
205        module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
206    }
207
208    //adreno needs 4k aligned offsets. Max hole size is 4096-1
209    size_t size = roundUpToPageSize(info.yres * info.xres *
210                                               (info.bits_per_pixel/8));
211
212    /*
213     * Request NUM_BUFFERS screens (at least 2 for page flipping)
214     */
215    int numberOfBuffers = (int)(finfo.smem_len/size);
216    ALOGV("num supported framebuffers in kernel = %d", numberOfBuffers);
217
218    if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
219        int num = atoi(property);
220        if ((num >= NUM_FRAMEBUFFERS_MIN) && (num <= NUM_FRAMEBUFFERS_MAX)) {
221            numberOfBuffers = num;
222        }
223    }
224    if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
225        numberOfBuffers = NUM_FRAMEBUFFERS_MAX;
226
227    ALOGV("We support %d buffers", numberOfBuffers);
228
229    //consider the included hole by 4k alignment
230    uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
231    info.yres_virtual = (uint32_t) ((size * numberOfBuffers) / line_length);
232
233    uint32_t flags = PAGE_FLIP;
234
235    if (info.yres_virtual < ((size * 2) / line_length) ) {
236        // we need at least 2 for page-flipping
237        info.yres_virtual = (int)(size / line_length);
238        flags &= ~PAGE_FLIP;
239        ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
240              info.yres_virtual, info.yres*2);
241    }
242
243    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1) {
244        close(fd);
245        return -errno;
246    }
247
248    if (int(info.width) <= 0 || int(info.height) <= 0) {
249        // the driver doesn't return that information
250        // default to 160 dpi
251        info.width  = (uint32_t)(((float)(info.xres) * 25.4f)/160.0f + 0.5f);
252        info.height = (uint32_t)(((float)(info.yres) * 25.4f)/160.0f + 0.5f);
253    }
254
255    float xdpi = ((float)(info.xres) * 25.4f) / (float)info.width;
256    float ydpi = ((float)(info.yres) * 25.4f) / (float)info.height;
257
258#ifdef MSMFB_METADATA_GET
259    struct msmfb_metadata metadata;
260    memset(&metadata, 0 , sizeof(metadata));
261    metadata.op = metadata_op_frame_rate;
262    if (ioctl(fd, MSMFB_METADATA_GET, &metadata) == -1) {
263        ALOGE("Error retrieving panel frame rate");
264        close(fd);
265        return -errno;
266    }
267    float fps = (float)metadata.data.panel_frame_rate;
268#else
269    //XXX: Remove reserved field usage on all baselines
270    //The reserved[3] field is used to store FPS by the driver.
271    float fps  = info.reserved[3] & 0xFF;
272#endif
273    ALOGI("using (fd=%d)\n"
274          "id           = %s\n"
275          "xres         = %d px\n"
276          "yres         = %d px\n"
277          "xres_virtual = %d px\n"
278          "yres_virtual = %d px\n"
279          "bpp          = %d\n"
280          "r            = %2u:%u\n"
281          "g            = %2u:%u\n"
282          "b            = %2u:%u\n",
283          fd,
284          finfo.id,
285          info.xres,
286          info.yres,
287          info.xres_virtual,
288          info.yres_virtual,
289          info.bits_per_pixel,
290          info.red.offset, info.red.length,
291          info.green.offset, info.green.length,
292          info.blue.offset, info.blue.length
293         );
294
295    ALOGI("width        = %d mm (%f dpi)\n"
296          "height       = %d mm (%f dpi)\n"
297          "refresh rate = %.2f Hz\n",
298          info.width,  xdpi,
299          info.height, ydpi,
300          fps
301         );
302
303
304    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1) {
305        close(fd);
306        return -errno;
307    }
308
309    if (finfo.smem_len <= 0) {
310        close(fd);
311        return -errno;
312    }
313
314    module->flags = flags;
315    module->info = info;
316    module->finfo = finfo;
317    module->xdpi = xdpi;
318    module->ydpi = ydpi;
319    module->fps = fps;
320    module->swapInterval = 1;
321
322    CALC_INIT();
323
324    /*
325     * map the framebuffer
326     */
327
328    module->numBuffers = info.yres_virtual / info.yres;
329    module->bufferMask = 0;
330    //adreno needs page aligned offsets. Align the fbsize to pagesize.
331    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres)*
332                    module->numBuffers;
333    module->framebuffer = new private_handle_t(fd, fbSize,
334                                        private_handle_t::PRIV_FLAGS_USES_ION,
335                                        BUFFER_TYPE_UI,
336                                        module->fbFormat, info.xres, info.yres);
337    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
338    if (vaddr == MAP_FAILED) {
339        ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
340        close(fd);
341        return -errno;
342    }
343    module->framebuffer->base = uintptr_t(vaddr);
344    memset(vaddr, 0, fbSize);
345    //Enable vsync
346    int enable = 1;
347    ioctl(module->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL,
348             &enable);
349    return 0;
350}
351
352static int mapFrameBuffer(struct private_module_t* module)
353{
354    int err = -1;
355    char property[PROPERTY_VALUE_MAX];
356    if((property_get("debug.gralloc.map_fb_memory", property, NULL) > 0) &&
357       (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
358        (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
359        pthread_mutex_lock(&module->lock);
360        err = mapFrameBufferLocked(module);
361        pthread_mutex_unlock(&module->lock);
362    }
363    return err;
364}
365
366/*****************************************************************************/
367
368static int fb_close(struct hw_device_t *dev)
369{
370    fb_context_t* ctx = (fb_context_t*)dev;
371    if (ctx) {
372        //Hack until fbdev is removed. Framework could close this causing hwc a
373        //pain.
374        //free(ctx);
375    }
376    return 0;
377}
378
379int fb_device_open(hw_module_t const* module, const char* name,
380                   hw_device_t** device)
381{
382    int status = -EINVAL;
383    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
384        alloc_device_t* gralloc_device;
385        status = gralloc_open(module, &gralloc_device);
386        if (status < 0)
387            return status;
388
389        /* initialize our state here */
390        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
391        if(dev == NULL) {
392            gralloc_close(gralloc_device);
393            return status;
394        }
395        memset(dev, 0, sizeof(*dev));
396
397        /* initialize the procs */
398        dev->device.common.tag      = HARDWARE_DEVICE_TAG;
399        dev->device.common.version  = 0;
400        dev->device.common.module   = const_cast<hw_module_t*>(module);
401        dev->device.common.close    = fb_close;
402        dev->device.setSwapInterval = fb_setSwapInterval;
403        dev->device.post            = fb_post;
404        dev->device.setUpdateRect   = 0;
405        dev->device.compositionComplete = fb_compositionComplete;
406
407        private_module_t* m = (private_module_t*)module;
408        status = mapFrameBuffer(m);
409        if (status >= 0) {
410            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
411            const_cast<uint32_t&>(dev->device.flags) = 0;
412            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
413            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
414            const_cast<int&>(dev->device.stride) = stride;
415            const_cast<int&>(dev->device.format) = m->fbFormat;
416            const_cast<float&>(dev->device.xdpi) = m->xdpi;
417            const_cast<float&>(dev->device.ydpi) = m->ydpi;
418            const_cast<float&>(dev->device.fps) = m->fps;
419            const_cast<int&>(dev->device.minSwapInterval) =
420                                                        PRIV_MIN_SWAP_INTERVAL;
421            const_cast<int&>(dev->device.maxSwapInterval) =
422                                                        PRIV_MAX_SWAP_INTERVAL;
423            const_cast<int&>(dev->device.numFramebuffers) = m->numBuffers;
424            dev->device.setUpdateRect = 0;
425
426            *device = &dev->device.common;
427        }
428
429        // Close the gralloc module
430        gralloc_close(gralloc_device);
431    }
432    return status;
433}
434