Add DRM driver abstraction
This adds an abstraction interface in src/drmmode_driver.h for the
driver-specific values (and in future functions) that we need. It
also adds documentation and build system support (--with-drmmode)
to choose your supported driver.
Initially, the dumb allocation flags and page flip events flags
are abstracted with support for pl111 and eynos.
A template implementation is also provided for ease of adding new
driver support.
Change-Id: I98890ddab6b907c3007b72a662ecd7ee6caa4402
diff --git a/src/drmmode_driver.h b/src/drmmode_driver.h
new file mode 100644
index 0000000..dfb5daf
--- /dev/null
+++ b/src/drmmode_driver.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2013 ARM Limited.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef DRMMODE_DRIVER_H
+#define DRMMODE_DRIVER_H
+
+#include <stdint.h>
+
+struct drmmode_interface {
+ /* Flags value to pass to DRM_IOCTL_MODE_CREATE_DUMB to allocate a scanout-capable
+ * buffer. A buffer allocated with these flags must be able to be wrapped in a
+ * DRM framebuffer (via DRM_IOCTL_MODE_ADDFB or DRM_IOCTL_MODE_ADDFB2).
+ */
+ uint32_t dumb_scanout_flags;
+
+ /* Flags value to pass to DRM_IOCTL_MODE_CREATE_DUMB to allocate a
+ * non-scanout-capable buffer. It is acceptable for the driver to create a
+ * scanout-capable buffer when given this flag, this flag is used to give the
+ * option of preserving scarce scanout-capable memory if applicable.
+ */
+ uint32_t dumb_no_scanout_flags;
+
+ /* Boolean value indicating whether DRM page flip events should be requested and
+ * waited for during DRM_IOCTL_MODE_PAGE_FLIP.
+ */
+ int use_page_flip_events;
+};
+
+struct drmmode_interface *drmmode_interface_get_implementation(int drm_fd);
+
+#endif