diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2018-02-21 02:49:25 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-21 12:05:39 -0400 |
| commit | 3aab15af9ad8fa8dc0399cb4b679d7cb85c20a56 (patch) | |
| tree | acd07cf67ae4ab9c752774d71a55489974359974 /drivers/media/tuners/e4000.c | |
| parent | 3f97df91a189ac84711467a687bef69dfd88b53c (diff) | |
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>
Diffstat (limited to 'drivers/media/tuners/e4000.c')
| -rw-r--r-- | drivers/media/tuners/e4000.c | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/drivers/media/tuners/e4000.c b/drivers/media/tuners/e4000.c index 564a000f503e..b5b9d87ba75c 100644 --- a/drivers/media/tuners/e4000.c +++ b/drivers/media/tuners/e4000.c @@ -293,28 +293,18 @@ static inline struct e4000_dev *e4000_subdev_to_dev(struct v4l2_subdev *sd) return container_of(sd, struct e4000_dev, sd); } -static int e4000_s_power(struct v4l2_subdev *sd, int on) +static int e4000_standby(struct v4l2_subdev *sd) { struct e4000_dev *dev = e4000_subdev_to_dev(sd); - struct i2c_client *client = dev->client; int ret; - dev_dbg(&client->dev, "on=%d\n", on); - - if (on) - ret = e4000_init(dev); - else - ret = e4000_sleep(dev); + ret = e4000_sleep(dev); if (ret) return ret; return e4000_set_params(dev); } -static const struct v4l2_subdev_core_ops e4000_subdev_core_ops = { - .s_power = e4000_s_power, -}; - static int e4000_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v) { struct e4000_dev *dev = e4000_subdev_to_dev(sd); @@ -382,6 +372,7 @@ static int e4000_enum_freq_bands(struct v4l2_subdev *sd, } static const struct v4l2_subdev_tuner_ops e4000_subdev_tuner_ops = { + .standby = e4000_standby, .g_tuner = e4000_g_tuner, .s_tuner = e4000_s_tuner, .g_frequency = e4000_g_frequency, @@ -390,7 +381,6 @@ static const struct v4l2_subdev_tuner_ops e4000_subdev_tuner_ops = { }; static const struct v4l2_subdev_ops e4000_subdev_ops = { - .core = &e4000_subdev_core_ops, .tuner = &e4000_subdev_tuner_ops, }; |