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