Hi Laurent,
On Wed, May 23, 2012 at 01:00:08PM +0200, Laurent Pinchart wrote:
> Hi Sakari,
>
> Thanks for the patch.
>
> On Wednesday 16 May 2012 06:12:49 Sakari Ailus wrote:
> > The chip is typically powered constantly and no board uses the set_power()
> > callback. Remove it.
> >
> > Signed-off-by: Sakari Ailus <sakari.ai...@iki.fi>
> > ---
> > drivers/media/video/as3645a.c | 39 +++++++++----------------------------
> > include/media/as3645a.h | 1 -
> > 2 files changed, 9 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/media/video/as3645a.c b/drivers/media/video/as3645a.c
> > index c4b0357..7454660 100644
> > --- a/drivers/media/video/as3645a.c
> > +++ b/drivers/media/video/as3645a.c
> > @@ -512,31 +512,6 @@ static int as3645a_setup(struct as3645a *flash)
> > return ret & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
> > }
> >
> > -static int __as3645a_set_power(struct as3645a *flash, int on)
> > -{
> > - int ret;
> > -
> > - if (!on)
> > - as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
> > -
> > - if (flash->pdata->set_power) {
> > - ret = flash->pdata->set_power(&flash->subdev, on);
> > - if (ret < 0)
> > - return ret;
> > - }
> > -
> > - if (!on)
> > - return 0;
> > -
> > - ret = as3645a_setup(flash);
> > - if (ret < 0) {
> > - if (flash->pdata->set_power)
> > - flash->pdata->set_power(&flash->subdev, 0);
> > - }
> > -
> > - return ret;
> > -}
> > -
> > static int as3645a_set_power(struct v4l2_subdev *sd, int on)
> > {
> > struct as3645a *flash = to_as3645a(sd);
> > @@ -545,9 +520,13 @@ static int as3645a_set_power(struct v4l2_subdev *sd,
> > int on) mutex_lock(&flash->power_lock);
> >
> > if (flash->power_count == !on) {
> > - ret = __as3645a_set_power(flash, !!on);
> > - if (ret < 0)
> > - goto done;
> > + if (!on) {
> > + as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
> > + } else {
> > + ret = as3645a_setup(flash);
> > + if (ret < 0)
> > + goto done;
> > + }
> > }
> >
>
> If the chip is powered on constantly, why do we need a .s_power() subdev
> operation at all ?
I don't know why was it there in the first place. Probably to make it easier
to use the driver on boards that required e.g. a regulator for the chip.
But typically they're connected to battery directly. The idle power
consumption is just some tens of µA.
Cheers,
--
Sakari Ailus
e-mail: sakari.ai...@iki.fi jabber/XMPP/Gmail: sai...@retiisi.org.uk
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