media: add tuner standby op, use where needed
The v4l2_subdev core s_power op was used for two different things: power on/off
sensors or video decoders/encoders and to put a tuner in standby (and only the
tuner!). There is no 'tuner wakeup' op, that's done automatically when the tuner
is accessed.
The danger with calling (s_power, 0) to put a tuner into standby is that it is
usually broadcast for all subdevs. So a video receiver subdev that supports
s_power will also be powered off, and since there is no corresponding (s_power, 1)
they will never be powered on again.
In addition, this is specifically meant for tuners only since they draw the most
current.
This patch adds a new tuner op called 'standby' and replaces all calls to
(core, s_power, 0) by (tuner, standby). This prevents confusion between the two
uses of s_power. Note that there is no overlap: bridge drivers either just want
to put the tuner into standby, or they deal with powering on/off sensors. Never
both.
This also makes it easier to replace s_power for the remaining bridge drivers
with some PM code later.
Whether we want something cleaner for tuners in the future is a separate topic.
There is a lot of legacy code surrounding tuners, and I am very hesitant about
making changes there.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/drivers/media/tuners/msi001.c b/drivers/media/tuners/msi001.c
index 3a12ef3..5de6ed7 100644
--- a/drivers/media/tuners/msi001.c
+++ b/drivers/media/tuners/msi001.c
@@ -291,26 +291,13 @@ static int msi001_set_tuner(struct msi001_dev *dev)
return ret;
}
-static int msi001_s_power(struct v4l2_subdev *sd, int on)
+static int msi001_standby(struct v4l2_subdev *sd)
{
struct msi001_dev *dev = sd_to_msi001_dev(sd);
- struct spi_device *spi = dev->spi;
- int ret;
- dev_dbg(&spi->dev, "on=%d\n", on);
-
- if (on)
- ret = 0;
- else
- ret = msi001_wreg(dev, 0x000000);
-
- return ret;
+ return msi001_wreg(dev, 0x000000);
}
-static const struct v4l2_subdev_core_ops msi001_core_ops = {
- .s_power = msi001_s_power,
-};
-
static int msi001_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
struct msi001_dev *dev = sd_to_msi001_dev(sd);
@@ -386,6 +373,7 @@ static int msi001_enum_freq_bands(struct v4l2_subdev *sd,
}
static const struct v4l2_subdev_tuner_ops msi001_tuner_ops = {
+ .standby = msi001_standby,
.g_tuner = msi001_g_tuner,
.s_tuner = msi001_s_tuner,
.g_frequency = msi001_g_frequency,
@@ -394,7 +382,6 @@ static const struct v4l2_subdev_tuner_ops msi001_tuner_ops = {
};
static const struct v4l2_subdev_ops msi001_ops = {
- .core = &msi001_core_ops,
.tuner = &msi001_tuner_ops,
};
