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 <dlfcn.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <sys/ioctl.h>
23 #include <sys/mman.h>
24
25 #include <cutils/ashmem.h>
26 #include <cutils/atomic.h>
27 #include <log/log.h>
28
29 #include <hardware/gralloc.h>
30 #include <hardware/hardware.h>
31
32 #ifdef __ANDROID__
33 #include <linux/fb.h>
34 #endif
35
36 #include "gralloc_priv.h"
37 #include "gr.h"
38
39 /*****************************************************************************/
40
41 // Set TARGET_USE_PAN_DISPLAY to true at compile time if the
42 // board uses FBIOPAN_DISPLAY to setup page flipping, otherwise
43 // default ioctl to do page-flipping is FBIOPUT_VSCREENINFO.
44 #ifndef USE_PAN_DISPLAY
45 #define USE_PAN_DISPLAY 0
46 #endif
47
48 // Enabling page flipping by default
49 #ifndef NUM_BUFFERS
50 #define NUM_BUFFERS 2
51 #endif
52
53
54 enum {
55 PAGE_FLIP = 0x00000001,
56 LOCKED = 0x00000002
57 };
58
59 struct fb_context_t {
60 framebuffer_device_t device;
61 };
62
63 /*****************************************************************************/
64
fb_setSwapInterval(struct framebuffer_device_t * dev,int interval)65 static int fb_setSwapInterval(struct framebuffer_device_t* dev,
66 int interval)
67 {
68 if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
69 return -EINVAL;
70 // FIXME: implement fb_setSwapInterval
71 return 0;
72 }
73
fb_post(struct framebuffer_device_t * dev,buffer_handle_t buffer)74 static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
75 {
76 if (private_handle_t::validate(buffer) < 0)
77 return -EINVAL;
78
79 private_handle_t const* hnd = reinterpret_cast<private_handle_t const*>(buffer);
80 private_module_t* m = reinterpret_cast<private_module_t*>(
81 dev->common.module);
82
83 if (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
84 const size_t offset = hnd->base - m->framebuffer->base;
85 m->info.activate = FB_ACTIVATE_VBL;
86 m->info.yoffset = offset / m->finfo.line_length;
87 if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
88 ALOGE("FBIOPUT_VSCREENINFO failed");
89 m->base.unlock(&m->base, buffer);
90 return -errno;
91 }
92 m->currentBuffer = buffer;
93
94 } else {
95 // If we can't do the page_flip, just copy the buffer to the front
96 // FIXME: use copybit HAL instead of memcpy
97
98 void* fb_vaddr;
99 void* buffer_vaddr;
100
101 m->base.lock(&m->base, m->framebuffer,
102 GRALLOC_USAGE_SW_WRITE_RARELY,
103 0, 0, m->info.xres, m->info.yres,
104 &fb_vaddr);
105
106 m->base.lock(&m->base, buffer,
107 GRALLOC_USAGE_SW_READ_RARELY,
108 0, 0, m->info.xres, m->info.yres,
109 &buffer_vaddr);
110
111 memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
112
113 m->base.unlock(&m->base, buffer);
114 m->base.unlock(&m->base, m->framebuffer);
115 }
116
117 return 0;
118 }
119
120 /*****************************************************************************/
121
mapFrameBufferLocked(struct private_module_t * module,int format)122 int mapFrameBufferLocked(struct private_module_t* module, int format)
123 {
124 // already initialized...
125 if (module->framebuffer) {
126 return 0;
127 }
128
129 char const * const device_template[] = {
130 "/dev/graphics/fb%u",
131 "/dev/fb%u",
132 0 };
133
134 int fd = -1;
135 int i=0;
136 char name[64];
137
138 while ((fd==-1) && device_template[i]) {
139 snprintf(name, 64, device_template[i], 0);
140 fd = open(name, O_RDWR, 0);
141 i++;
142 }
143 if (fd < 0)
144 return -errno;
145
146 struct fb_fix_screeninfo finfo;
147 if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
148 return -errno;
149
150 struct fb_var_screeninfo info;
151 if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
152 return -errno;
153
154 info.reserved[0] = 0;
155 info.reserved[1] = 0;
156 info.reserved[2] = 0;
157 info.xoffset = 0;
158 info.yoffset = 0;
159 info.activate = FB_ACTIVATE_NOW;
160
161 /*
162 * Request NUM_BUFFERS screens
163 * To enable page flipping, NUM_BUFFERS should be at least 2.
164 */
165 info.yres_virtual = info.yres * NUM_BUFFERS;
166
167 switch (format) {
168 case HAL_PIXEL_FORMAT_RGBA_8888:
169 info.bits_per_pixel = 32;
170 info.red.offset = 0;
171 info.red.length = 8;
172 info.green.offset = 8;
173 info.green.length = 8;
174 info.blue.offset = 16;
175 info.blue.length = 8;
176 break;
177 default:
178 ALOGW("unknown format: %d", format);
179 break;
180 }
181
182 uint32_t flags = PAGE_FLIP;
183 #if USE_PAN_DISPLAY
184 if (ioctl(fd, FBIOPAN_DISPLAY, &info) == -1) {
185 ALOGW("FBIOPAN_DISPLAY failed, page flipping not supported");
186 #else
187 if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
188 ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
189 #endif
190 info.yres_virtual = info.yres;
191 flags &= ~PAGE_FLIP;
192 }
193
194 if (info.yres_virtual < info.yres * 2) {
195 // we need at least 2 for page-flipping
196 info.yres_virtual = info.yres;
197 flags &= ~PAGE_FLIP;
198 ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
199 info.yres_virtual, info.yres*2);
200 }
201
202 if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
203 return -errno;
204
205 uint64_t refreshQuotient =
206 (
207 uint64_t( info.upper_margin + info.lower_margin + info.yres )
208 * ( info.left_margin + info.right_margin + info.xres )
209 * info.pixclock
210 );
211
212 /* Beware, info.pixclock might be 0 under emulation, so avoid a
213 * division-by-0 here (SIGFPE on ARM) */
214 int refreshRate = refreshQuotient > 0 ? (int)(1000000000000000LLU / refreshQuotient) : 0;
215
216 if (refreshRate == 0) {
217 // bleagh, bad info from the driver
218 refreshRate = 60*1000; // 60 Hz
219 }
220
221 if (int(info.width) <= 0 || int(info.height) <= 0) {
222 // the driver doesn't return that information
223 // default to 160 dpi
224 info.width = ((info.xres * 25.4f)/160.0f + 0.5f);
225 info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
226 }
227
228 float xdpi = (info.xres * 25.4f) / info.width;
229 float ydpi = (info.yres * 25.4f) / info.height;
230 float fps = refreshRate / 1000.0f;
231
232 ALOGI( "using (fd=%d)\n"
233 "id = %s\n"
234 "xres = %d px\n"
235 "yres = %d px\n"
236 "xres_virtual = %d px\n"
237 "yres_virtual = %d px\n"
238 "bpp = %d\n"
239 "r = %2u:%u\n"
240 "g = %2u:%u\n"
241 "b = %2u:%u\n",
242 fd,
243 finfo.id,
244 info.xres,
245 info.yres,
246 info.xres_virtual,
247 info.yres_virtual,
248 info.bits_per_pixel,
249 info.red.offset, info.red.length,
250 info.green.offset, info.green.length,
251 info.blue.offset, info.blue.length
252 );
253
254 ALOGI( "width = %d mm (%f dpi)\n"
255 "height = %d mm (%f dpi)\n"
256 "refresh rate = %.2f Hz\n",
257 info.width, xdpi,
258 info.height, ydpi,
259 fps
260 );
261
262
263 if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
264 return -errno;
265
266 if (finfo.smem_len <= 0)
267 return -errno;
268
269
270 module->flags = flags;
271 module->info = info;
272 module->finfo = finfo;
273 module->xdpi = xdpi;
274 module->ydpi = ydpi;
275 module->fps = fps;
276
277 /*
278 * map the framebuffer
279 */
280
281 size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
282 module->framebuffer = new private_handle_t(dup(fd), fbSize, 0);
283
284 module->numBuffers = info.yres_virtual / info.yres;
285 module->bufferMask = 0;
286
287 void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
288 if (vaddr == MAP_FAILED) {
289 ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
290 return -errno;
291 }
292 module->framebuffer->base = intptr_t(vaddr);
293 memset(vaddr, 0, fbSize);
294 return 0;
295 }
296
297 static int mapFrameBuffer(struct private_module_t* module)
298 {
299 pthread_mutex_lock(&module->lock);
300 // Request RGBA8888 because the platform assumes support for RGBA8888.
301 int err = mapFrameBufferLocked(module, HAL_PIXEL_FORMAT_RGBA_8888);
302 pthread_mutex_unlock(&module->lock);
303 return err;
304 }
305
306 /*****************************************************************************/
307
308 static int fb_close(struct hw_device_t *dev)
309 {
310 fb_context_t* ctx = (fb_context_t*)dev;
311 if (ctx) {
312 free(ctx);
313 }
314 return 0;
315 }
316
317 int fb_device_open(hw_module_t const* module, const char* name,
318 hw_device_t** device)
319 {
320 int status = -EINVAL;
321 if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
322 /* initialize our state here */
323 fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
324 memset(dev, 0, sizeof(*dev));
325
326 /* initialize the procs */
327 dev->device.common.tag = HARDWARE_DEVICE_TAG;
328 dev->device.common.version = 0;
329 dev->device.common.module = const_cast<hw_module_t*>(module);
330 dev->device.common.close = fb_close;
331 dev->device.setSwapInterval = fb_setSwapInterval;
332 dev->device.post = fb_post;
333 dev->device.setUpdateRect = 0;
334
335 private_module_t* m = (private_module_t*)module;
336 status = mapFrameBuffer(m);
337 if (status >= 0) {
338 int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
339 int format = (m->info.bits_per_pixel == 32)
340 ? (m->info.red.offset ? HAL_PIXEL_FORMAT_BGRA_8888 : HAL_PIXEL_FORMAT_RGBX_8888)
341 : HAL_PIXEL_FORMAT_RGB_565;
342 const_cast<uint32_t&>(dev->device.flags) = 0;
343 const_cast<uint32_t&>(dev->device.width) = m->info.xres;
344 const_cast<uint32_t&>(dev->device.height) = m->info.yres;
345 const_cast<int&>(dev->device.stride) = stride;
346 const_cast<int&>(dev->device.format) = format;
347 const_cast<float&>(dev->device.xdpi) = m->xdpi;
348 const_cast<float&>(dev->device.ydpi) = m->ydpi;
349 const_cast<float&>(dev->device.fps) = m->fps;
350 const_cast<int&>(dev->device.minSwapInterval) = 1;
351 const_cast<int&>(dev->device.maxSwapInterval) = 1;
352 *device = &dev->device.common;
353 } else {
354 free(dev);
355 }
356 }
357 return status;
358 }
359