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[v12,14/19] media: tvp5150: add v4l2-event support

Message ID 20200309101428.15267-15-m.felsch@pengutronix.de
State New
Headers show
Series [v12,01/19] dt-bindings: connector: analog: add sdtv standards property | expand

Commit Message

Marco Felsch March 9, 2020, 10:14 a.m. UTC 
Currently the driver notifies internal subdevs if the signal is locked
or not. This information is also useful for userpace applications e.g. to
switch to another input device upon a signal lost event.

This commit adds the support for the userspace to subscribe to the
V4L2_EVENT_SOURCE_CHANGE and V4L2_EVENT_CTRL events.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
v12:
- new patch

 drivers/media/i2c/tvp5150.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
index 313d2a43d79e..9bad3192358d 100644
--- a/drivers/media/i2c/tvp5150.c
+++ b/drivers/media/i2c/tvp5150.c
@@ -17,6 +17,7 @@ 
 #include <linux/regmap.h>
 #include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-mc.h>
@@ -1526,6 +1527,19 @@  static int tvp5150_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_regi
 }
 #endif
 
+static int tvp5150_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
+				   struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subdev_subscribe(sd, fh, sub);
+	case V4L2_EVENT_CTRL:
+		return v4l2_ctrl_subdev_subscribe_event(sd, fh, sub);
+	default:
+		return -EINVAL;
+	}
+}
+
 static int tvp5150_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 {
 	int status = tvp5150_read(sd, 0x88);
@@ -1617,6 +1631,8 @@  static const struct v4l2_subdev_core_ops tvp5150_core_ops = {
 	.g_register = tvp5150_g_register,
 	.s_register = tvp5150_s_register,
 #endif
+	.subscribe_event = tvp5150_subscribe_event,
+	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
 };
 
 static const struct v4l2_subdev_tuner_ops tvp5150_tuner_ops = {
@@ -2045,7 +2061,7 @@  static int tvp5150_probe(struct i2c_client *c)
 	sd = &core->sd;
 	v4l2_i2c_subdev_init(sd, c, &tvp5150_ops);
 	sd->internal_ops = &tvp5150_internal_ops;
-	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
 
 	if (IS_ENABLED(CONFIG_OF) && np) {
 		res = tvp5150_parse_dt(core, np);