Subject: [PATCH] [acpi video] Add helpers for reading/writing device state

- video_dev_get_state()
  - Queries the device state via _DCS and _DGS
- video_dev_set_state()
  - Sets state via _DSS

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

---

 drivers/acpi/drivers/video/dev-device.c |   38 +++++++++++++++++++++++++++++++
 drivers/acpi/drivers/video/video.h      |    3 ++
 2 files changed, 41 insertions(+), 0 deletions(-)

applies-to: 9cedbecfa198f4ec20d6b9a12e9fac3e48802229
de9ffd5025cd716b20f7c058dde1bee48c91d8b5
diff --git a/drivers/acpi/drivers/video/dev-device.c b/drivers/acpi/drivers/video/dev-device.c
index c504576..8b79528 100644
--- a/drivers/acpi/drivers/video/dev-device.c
+++ b/drivers/acpi/drivers/video/dev-device.c
@@ -306,3 +306,41 @@ int video_dev_edid(struct acpi_video_dev
 	return ret;
 }
 
+/**
+ *	video_dev_get_state - Get the device state via _DCS
+ *	@vd:		The ACPI video device
+ *	@output:	The returned state of the output device (montior)
+ *	@graphics:	The returned state of the graphics device (card)
+ */
+
+int video_dev_get_state(struct acpi_video_dev * vd, u32 * output, u32 * graphics)
+{
+	unsigned long s;
+	int ret = 0;
+
+	if (vd->v_hotkey) {
+		ret = get_int(vd->v_ad, "_DCS", &s);
+		if (!ret)
+			*output = s;
+		else
+			return ret;
+
+		ret = get_int(vd->v_ad, "_DGS", &s);
+		if (!ret)
+			*graphics = s;
+	}
+	return ret;
+}
+
+
+/**
+ *	video_dev_set_state - Set the device state via _DCS
+ *	@vd:	The ACPI video device
+ *	@state:	The state we're setting
+ */
+
+int video_dev_set_state(struct acpi_video_dev * vd, u32 state)
+{
+	return vd->v_hotkey ? set_int(vd->v_ad, "_DSS", state) : -EIO;
+}
+
diff --git a/drivers/acpi/drivers/video/video.h b/drivers/acpi/drivers/video/video.h
index 49d7399..4453576 100644
--- a/drivers/acpi/drivers/video/video.h
+++ b/drivers/acpi/drivers/video/video.h
@@ -76,6 +76,9 @@ extern int video_dev_init(struct acpi_vi
 extern const char * video_dev_string(struct acpi_video_dev * vd);
 extern int video_dev_edid(struct acpi_video_dev * vd, char ** buffer, size_t * len);
 
+extern int video_dev_get_state(struct acpi_video_dev *, u32 *, u32 *);
+extern int video_dev_set_state(struct acpi_video_dev * vd, u32 output_state);
+
 extern int video_bus_attach(struct acpi_video_dev * vd);
 extern void video_bus_detach(struct acpi_video_dev * vd);
 
---
0.99.9.GIT