exynos: Introduce exynos_handle_event()

Used to handle kernel events specific to the Exynos platform.
Currently only G2D events are handled.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>

exynos/exynos-symbol-check

@@ -22,6 +22,7 @@ exynos_device_destroy
 exynos_prime_fd_to_handle
 exynos_prime_handle_to_fd
 exynos_vidi_connection
+exynos_handle_event
 g2d_blend
 g2d_copy
 g2d_copy_with_scale

exynos/exynos_drm.c

@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <unistd.h>
 
 #include <sys/mman.h>
 #include <linux/stddef.h>
@@ -42,6 +43,8 @@
 #include "exynos_drm.h"
 #include "exynos_drmif.h"
 
+#define U642VOID(x) ((void *)(unsigned long)(x))
+
 /*
  * Create exynos drm device object.
  *
@@ -374,3 +377,76 @@ exynos_vidi_connection(struct exynos_device *dev, uint32_t connect,
 
 	return 0;
 }
+
+static void
+exynos_handle_vendor(int fd, struct drm_event *e, void *ctx)
+{
+	struct drm_exynos_g2d_event *g2d;
+	struct exynos_event_context *ectx = ctx;
+
+	switch (e->type) {
+		case DRM_EXYNOS_G2D_EVENT:
+			if (ectx->version < 1 || ectx->g2d_event_handler == NULL)
+				break;
+			g2d = (struct drm_exynos_g2d_event *)e;
+			ectx->g2d_event_handler(fd, g2d->cmdlist_no, g2d->tv_sec,
+						g2d->tv_usec, U642VOID(g2d->user_data));
+			break;
+
+		default:
+			break;
+	}
+}
+
+int
+exynos_handle_event(struct exynos_device *dev, struct exynos_event_context *ctx)
+{
+	char buffer[1024];
+	int len, i;
+	struct drm_event *e;
+	struct drm_event_vblank *vblank;
+	drmEventContextPtr evctx = &ctx->base;
+
+	/* The DRM read semantics guarantees that we always get only
+	 * complete events. */
+	len = read(dev->fd, buffer, sizeof buffer);
+	if (len == 0)
+		return 0;
+	if (len < (int)sizeof *e)
+		return -1;
+
+	i = 0;
+	while (i < len) {
+		e = (struct drm_event *) &buffer[i];
+		switch (e->type) {
+		case DRM_EVENT_VBLANK:
+			if (evctx->version < 1 ||
+			    evctx->vblank_handler == NULL)
+				break;
+			vblank = (struct drm_event_vblank *) e;
+			evctx->vblank_handler(dev->fd,
+					      vblank->sequence,
+					      vblank->tv_sec,
+					      vblank->tv_usec,
+					      U642VOID (vblank->user_data));
+			break;
+		case DRM_EVENT_FLIP_COMPLETE:
+			if (evctx->version < 2 ||
+			    evctx->page_flip_handler == NULL)
+				break;
+			vblank = (struct drm_event_vblank *) e;
+			evctx->page_flip_handler(dev->fd,
+						 vblank->sequence,
+						 vblank->tv_sec,
+						 vblank->tv_usec,
+						 U642VOID (vblank->user_data));
+			break;
+		default:
+			exynos_handle_vendor(dev->fd, e, evctx);
+			break;
+		}
+		i += e->length;
+	}
+
+	return 0;
+}

exynos/exynos_drm.h

@@ -157,4 +157,16 @@ struct drm_exynos_g2d_exec {
 #define DRM_IOCTL_EXYNOS_G2D_EXEC		DRM_IOWR(DRM_COMMAND_BASE + \
 		DRM_EXYNOS_G2D_EXEC, struct drm_exynos_g2d_exec)
 
+/* EXYNOS specific events */
+#define DRM_EXYNOS_G2D_EVENT		0x80000000
+
+struct drm_exynos_g2d_event {
+	struct drm_event	base;
+	__u64				user_data;
+	__u32				tv_sec;
+	__u32				tv_usec;
+	__u32				cmdlist_no;
+	__u32				reserved;
+};
+
 #endif

exynos/exynos_drmif.h

@@ -54,6 +54,25 @@ struct exynos_bo {
 	uint32_t		name;
 };
 
+#define EXYNOS_EVENT_CONTEXT_VERSION 1
+
+/*
+ * Exynos Event Context structure.
+ *
+ * @base: base context (for core events).
+ * @version: version info similar to the one in 'drmEventContext'.
+ * @g2d_event_handler: handler for G2D events.
+ */
+struct exynos_event_context {
+	drmEventContext base;
+
+	int version;
+
+	void (*g2d_event_handler)(int fd, unsigned int cmdlist_no,
+							  unsigned int tv_sec, unsigned int tv_usec,
+							  void *user_data);
+};
+
 /*
  * device related functions:
  */
@@ -83,4 +102,11 @@ int exynos_prime_fd_to_handle(struct exynos_device *dev, int fd,
 int exynos_vidi_connection(struct exynos_device *dev, uint32_t connect,
 				uint32_t ext, void *edid);
 
+/*
+ * event handling related functions:
+ */
+int exynos_handle_event(struct exynos_device *dev,
+				struct exynos_event_context *ctx);
+
+
 #endif /* EXYNOS_DRMIF_H_ */