Lines Matching full:driver
14 <li><a href="#androidDisplayDriversSourceTemplate">Implementing Your Own Driver (Driver Template)</a></li>
20 <p>This section describes how the display driver functions and offers a functional template designed to help you build your own device-specific driver.</p>
21 <p>Android relies on the standard frame buffer device (<code>/dev/fb0</code> or <code>/dev/graphics/fb0</code>) and driver as described in the <code>linux/fb.h</code> kernel header file. For more information regarding the standard Linux frame buffer, please see <a href="http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.24.y.git;a=blob;f=Documentation/fb/framebuffer.txt">The Frame Buffer Device</a> at <a href="http://kernel.org">http://kernel.org</a>.
29 <p>Android makes two requirements of the driver: a linear address space of mappable memory that it can write to directly and support for the rgb_565 pixel format. A typical frame display includes:</p>
31 <li>accessing the driver by calling open on <code>/dev/fb0</code></li>
35 <p>When a page flip is required, Android makes another <code>FBIOPUT_VSCREENINFO</code> ioctl call with a new y-offset pointing to the other buffer in video memory. This ioctl, in turn, invokes the driver's <code>.fb_pan_display</code> function in order to do the actual flip. If there isn't sufficient video memory, regular memory is used and is just copied into the video memory when it is time do the flip. After allocating the video memory and setting the pixel format, Android uses <code>mmap()</code> to map the memory into the process's address space. All writes to the frame buffer are done through this mmaped memory.</p>
39 <a name="androidDisplayDriversSourceTemplate"></a><h3>Implementing Your Own Driver (Driver Template)</h3>
41 <p>The following sample driver offers a functional example to help you build your own display driver. Modify <code>PGUIDE_FB...</code> macros as desired to match the requirements of your own device hardware.</p>
55 * ANDROID PORTING GUIDE: FRAME BUFFER DRIVER TEMPLATE
315 .driver = {
