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