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 2 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 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 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 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 /*****************************************************************************/ 137 138 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
