linux-kernel - RE: [PATCH 0/2] kxcjk-1013 driver optimizations

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Date:	Fri, 20 Feb 2015 12:03:38 +0000
From:	"Tirdea, Irina" <irina.tirdea@...el.com>
To:	Peter Meerwald <pmeerw@...erw.net>
CC:	Jonathan Cameron <jic23@...nel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
	"Reus, Adriana" <adriana.reus@...el.com>
Subject: RE: [PATCH 0/2] kxcjk-1013 driver optimizations



> -----Original Message-----
> From: Peter Meerwald [mailto:pmeerw@...erw.net]
> Sent: 16 February, 2015 21:14
> To: Tirdea, Irina
> Cc: Jonathan Cameron; linux-iio@...r.kernel.org; linux-kernel@...r.kernel.org; Pandruvada, Srinivas; Reus, Adriana
> Subject: Re: [PATCH 0/2] kxcjk-1013 driver optimizations
> 
> 
> > Adds optimization of i2c transactions in trigger handler and
> > usage of available_scan_masks for kxcjk-1013.
> 
> the 'optimization' changes the capabilities of the driver, reading
> individual channel is not possible anymore
> 
We can still read individual channels, just that the driver does not see that anymore and the demux is handled by the iio core.
available_scan_masks contains the bitmap superset for all channels we can enable (I will remove the 0 available_scan_mask as it does not makes sense).
When a new channel is enabled, the iio core checks if the new mask is a subset of any entry in available_scan_masks. When the buffer is pushed from the driver, the iio core will select only the enabled channel values.

> > Adriana Reus (2):
> >   iio: accel: kxcjk-1013: use available_scan_masks
> >   iio: accel: kxcjk-1013: optimize i2c transfers in trigger handler
> >
> >  drivers/iio/accel/kxcjk-1013.c | 50 ++++++++++++++++++++++++++++++++----------
> >  1 file changed, 39 insertions(+), 11 deletions(-)
> >
> >
> 
> --
> 
> Peter Meerwald
> +43-664-2444418 (mobile)
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