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 #if defined(NO_PAGE_FLIPPING)
47 // page-flipping is buggy on some devices
48 #define NUM_BUFFERS 1
49 #else
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 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
fb_setUpdateRect(struct framebuffer_device_t * dev,int l,int t,int w,int h)75 static 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
fb_post(struct framebuffer_device_t * dev,buffer_handle_t buffer)90 static 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 (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
102 const size_t offset = hnd->base - m->framebuffer->base;
103 m->info.activate = FB_ACTIVATE_VBL;
104 m->info.yoffset = offset / m->finfo.line_length;
105 if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
106 LOGE("FBIOPUT_VSCREENINFO failed");
107 m->base.unlock(&m->base, buffer);
108 return -errno;
109 }
110 m->currentBuffer = buffer;
111
112 } else {
113 // If we can't do the page_flip, just copy the buffer to the front
114 // FIXME: use copybit HAL instead of memcpy
115
116 void* fb_vaddr;
117 void* buffer_vaddr;
118
119 m->base.lock(&m->base, m->framebuffer,
120 GRALLOC_USAGE_SW_WRITE_RARELY,
121 0, 0, m->info.xres, m->info.yres,
122 &fb_vaddr);
123
124 m->base.lock(&m->base, buffer,
125 GRALLOC_USAGE_SW_READ_RARELY,
126 0, 0, m->info.xres, m->info.yres,
127 &buffer_vaddr);
128
129 memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
130
131 m->base.unlock(&m->base, buffer);
132 m->base.unlock(&m->base, m->framebuffer);
133 }
134
135 return 0;
136 }
137
138 /*****************************************************************************/
139
mapFrameBufferLocked(struct private_module_t * module)140 int mapFrameBufferLocked(struct private_module_t* module)
141 {
142 // already initialized...
143 if (module->framebuffer) {
144 return 0;
145 }
146
147 char const * const device_template[] = {
148 "/dev/graphics/fb%u",
149 "/dev/fb%u",
150 0 };
151
152 int fd = -1;
153 int i=0;
154 char name[64];
155
156 while ((fd==-1) && device_template[i]) {
157 snprintf(name, 64, device_template[i], 0);
158 fd = open(name, O_RDWR, 0);
159 i++;
160 }
161 if (fd < 0)
162 return -errno;
163
164 struct fb_fix_screeninfo finfo;
165 if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
166 return -errno;
167
168 struct fb_var_screeninfo info;
169 if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
170 return -errno;
171
172 info.reserved[0] = 0;
173 info.reserved[1] = 0;
174 info.reserved[2] = 0;
175 info.xoffset = 0;
176 info.yoffset = 0;
177 info.activate = FB_ACTIVATE_NOW;
178
179 #if defined(NO_32BPP)
180 /*
181 * Explicitly request 5/6/5
182 */
183 info.bits_per_pixel = 16;
184 info.red.offset = 11;
185 info.red.length = 5;
186 info.green.offset = 5;
187 info.green.length = 6;
188 info.blue.offset = 0;
189 info.blue.length = 5;
190 info.transp.offset = 0;
191 info.transp.length = 0;
192 #endif
193
194 /*
195 * Request NUM_BUFFERS screens (at lest 2 for page flipping)
196 */
197 info.yres_virtual = info.yres * NUM_BUFFERS;
198
199
200 uint32_t flags = PAGE_FLIP;
201 if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
202 info.yres_virtual = info.yres;
203 flags &= ~PAGE_FLIP;
204 LOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
205 }
206
207 if (info.yres_virtual < info.yres * 2) {
208 // we need at least 2 for page-flipping
209 info.yres_virtual = info.yres;
210 flags &= ~PAGE_FLIP;
211 LOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
212 info.yres_virtual, info.yres*2);
213 }
214
215 if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
216 return -errno;
217
218 uint64_t refreshQuotient =
219 (
220 uint64_t( info.upper_margin + info.lower_margin + info.yres )
221 * ( info.left_margin + info.right_margin + info.xres )
222 * info.pixclock
223 );
224
225 /* Beware, info.pixclock might be 0 under emulation, so avoid a
226 * division-by-0 here (SIGFPE on ARM) */
227 int refreshRate = refreshQuotient > 0 ? (int)(1000000000000000LLU / refreshQuotient) : 0;
228
229 if (refreshRate == 0) {
230 // bleagh, bad info from the driver
231 refreshRate = 60*1000; // 60 Hz
232 }
233
234 if (int(info.width) <= 0 || int(info.height) <= 0) {
235 // the driver doesn't return that information
236 // default to 160 dpi
237 info.width = ((info.xres * 25.4f)/160.0f + 0.5f);
238 info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
239 }
240
241 float xdpi = (info.xres * 25.4f) / info.width;
242 float ydpi = (info.yres * 25.4f) / info.height;
243 float fps = refreshRate / 1000.0f;
244
245 LOGI( "using (fd=%d)\n"
246 "id = %s\n"
247 "xres = %d px\n"
248 "yres = %d px\n"
249 "xres_virtual = %d px\n"
250 "yres_virtual = %d px\n"
251 "bpp = %d\n"
252 "r = %2u:%u\n"
253 "g = %2u:%u\n"
254 "b = %2u:%u\n",
255 fd,
256 finfo.id,
257 info.xres,
258 info.yres,
259 info.xres_virtual,
260 info.yres_virtual,
261 info.bits_per_pixel,
262 info.red.offset, info.red.length,
263 info.green.offset, info.green.length,
264 info.blue.offset, info.blue.length
265 );
266
267 LOGI( "width = %d mm (%f dpi)\n"
268 "height = %d mm (%f dpi)\n"
269 "refresh rate = %.2f Hz\n",
270 info.width, xdpi,
271 info.height, ydpi,
272 fps
273 );
274
275
276 if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
277 return -errno;
278
279 if (finfo.smem_len <= 0)
280 return -errno;
281
282
283 module->flags = flags;
284 module->info = info;
285 module->finfo = finfo;
286 module->xdpi = xdpi;
287 module->ydpi = ydpi;
288 module->fps = fps;
289
290 /*
291 * map the framebuffer
292 */
293
294 int err;
295 size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
296 module->framebuffer = new private_handle_t(dup(fd), fbSize, 0);
297
298 module->numBuffers = info.yres_virtual / info.yres;
299 module->bufferMask = 0;
300
301 void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
302 if (vaddr == MAP_FAILED) {
303 LOGE("Error mapping the framebuffer (%s)", strerror(errno));
304 return -errno;
305 }
306 module->framebuffer->base = intptr_t(vaddr);
307 memset(vaddr, 0, fbSize);
308 return 0;
309 }
310
mapFrameBuffer(struct private_module_t * module)311 static int mapFrameBuffer(struct private_module_t* module)
312 {
313 pthread_mutex_lock(&module->lock);
314 int err = mapFrameBufferLocked(module);
315 pthread_mutex_unlock(&module->lock);
316 return err;
317 }
318
319 /*****************************************************************************/
320
fb_close(struct hw_device_t * dev)321 static int fb_close(struct hw_device_t *dev)
322 {
323 fb_context_t* ctx = (fb_context_t*)dev;
324 if (ctx) {
325 free(ctx);
326 }
327 return 0;
328 }
329
fb_device_open(hw_module_t const * module,const char * name,hw_device_t ** device)330 int fb_device_open(hw_module_t const* module, const char* name,
331 hw_device_t** device)
332 {
333 int status = -EINVAL;
334 if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
335 alloc_device_t* gralloc_device;
336 status = gralloc_open(module, &gralloc_device);
337 if (status < 0)
338 return status;
339
340 /* initialize our state here */
341 fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
342 memset(dev, 0, sizeof(*dev));
343
344 /* initialize the procs */
345 dev->device.common.tag = HARDWARE_DEVICE_TAG;
346 dev->device.common.version = 0;
347 dev->device.common.module = const_cast<hw_module_t*>(module);
348 dev->device.common.close = fb_close;
349 dev->device.setSwapInterval = fb_setSwapInterval;
350 dev->device.post = fb_post;
351 dev->device.setUpdateRect = 0;
352
353 private_module_t* m = (private_module_t*)module;
354 status = mapFrameBuffer(m);
355 if (status >= 0) {
356 int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
357 int format = (m->info.bits_per_pixel == 32)
358 ? HAL_PIXEL_FORMAT_RGBX_8888
359 : HAL_PIXEL_FORMAT_RGB_565;
360 #ifdef NO_32BPP
361 format = HAL_PIXEL_FORMAT_RGB_565;
362 #endif
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) = format;
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 *device = &dev->device.common;
374 }
375 }
376 return status;
377 }
378