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 56 enum { 57 PAGE_FLIP = 0x00000001, 58 LOCKED = 0x00000002 59 }; 60 61 struct fb_context_t { 62 framebuffer_device_t device; 63 }; 64 65 /*****************************************************************************/ 66 67 static 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 77 static 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 92 static 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 /*****************************************************************************/ 141 142 int 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 } 302 303 static 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 /*****************************************************************************/ 312 313 static 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 } 321 322 int 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
