Subject: [PATCH] [acpi video] Add exported functions to attach/detach video devices to bus

- Create bus-lib.c
- Create video_bus_{attach,detach}() that will associate an ACPI video device
  (that has been bound) to the corresponding entry in the bus's array of
  attached devices (got via _DOD)
- Export functions, so video driver can use them

Signed-off-by: Patrick Mochel <mochel@linux.intel.com>

---

 drivers/acpi/drivers/video/Makefile  |    2 +
 drivers/acpi/drivers/video/bus-lib.c |   63 ++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 1 deletions(-)
 create mode 100644 drivers/acpi/drivers/video/bus-lib.c

applies-to: 9329c66da499389077cdf2bb58fb8918c1109946
637eefdb91fa684bfcb4e916ac09e7141360c47b
diff --git a/drivers/acpi/drivers/video/Makefile b/drivers/acpi/drivers/video/Makefile
index 715e390..4157305 100644
--- a/drivers/acpi/drivers/video/Makefile
+++ b/drivers/acpi/drivers/video/Makefile
@@ -4,7 +4,7 @@ obj-$(CONFIG_ACPI_VIDEO)	+= video-bus.o 
 # Video Bus Driver
 #
 video-bus-y				:= bus-driver.o bus-device.o
-video-bus-y				+= bus-event.o
+video-bus-y				+= bus-event.o bus-lib.o
 
 video-bus-$(CONFIG_ACPI_DM_PROC)	+= bus-proc.o
 video-bus-$(CONFIG_ACPI_DM_SYSFS)	+= bus-sysfs.o
diff --git a/drivers/acpi/drivers/video/bus-lib.c b/drivers/acpi/drivers/video/bus-lib.c
new file mode 100644
index 0000000..3e413e5
--- /dev/null
+++ b/drivers/acpi/drivers/video/bus-lib.c
@@ -0,0 +1,63 @@
+/***
+ * drivers/acpi/drivers/video/bus-lib.c - Exported functions for video devices
+ *
+ * Copyright (C) 2006 Patrick Mochel
+ *
+ * Based on drivers/acpi/video.c, which was 
+ *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
+ *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include "video.h"
+
+
+static struct acpi_video_bus * get_video_bus(struct acpi_video_dev * vd)
+{
+	if (vd->v_ad->dev.parent && vd->v_ad->dev.parent->driver)
+		return dev_get_drvdata(vd->v_ad->dev.parent);
+	return NULL;
+}
+
+
+int video_bus_attach(struct acpi_video_dev * vd)
+{
+	struct acpi_video_bus * vb;
+	int i;
+
+	vb = get_video_bus(vd);
+	if (!vb)
+		return -EINVAL;
+
+	for (i = 0; i < vb->v_dev_num; i++) {
+		if (!vb->v_dev[i].v_device) {
+			if (vb->v_dev[i].v_device_id == vd->v_id) {
+				vd->v_bus_id = i;
+				vb->v_dev[i].v_device = vd;
+				return 0;
+			}
+		}
+	}
+	return -ENODEV;
+}
+
+EXPORT_SYMBOL_GPL(video_bus_attach);
+
+
+void video_bus_detach(struct acpi_video_dev * vd)
+{
+	struct acpi_video_bus * vb;
+	int i = vd->v_bus_id;
+
+	vb = get_video_bus(vd);
+	if (vb) {
+		if (i < vb->v_dev_num && vb->v_dev[i].v_device == vd) {
+			vb->v_dev[i].v_device = NULL;
+			vd->v_bus_id = 0;
+		}
+	}
+}
+
+EXPORT_SYMBOL_GPL(video_bus_detach);
+
---
0.99.9.GIT