linux-kernel - Re: [PATCH 1/7] iio: adc: ad7266: claim direct mode during sensor read

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Date:	Sun, 29 May 2016 18:02:29 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Daniel Baluta <daniel.baluta@...il.com>,
	Alison Schofield <amsfield22@...il.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	"Hennerich, Michael" <Michael.Hennerich@...log.com>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] iio: adc: ad7266: claim direct mode during sensor
 read

On 25/05/16 11:33, Daniel Baluta wrote:
> On Tue, May 24, 2016 at 10:16 PM, Alison Schofield <amsfield22@...il.com> wrote:
>> Driver was checking for direct mode but not locking it down.
>> Use iio_device_claim_direct_mode() to guarantee device stays
>> in direct mode.
>>
>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
>> Cc: Daniel Baluta <daniel.baluta@...il.com>
> 
> Acked-by: Daniel Baluta <daniel.baluta@...il.com>
Looks good.

Applied to the togreg branch of iio.git - initially pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan
> 
>> ---
>>  drivers/iio/adc/ad7266.c | 7 +++----
>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
>> index 21e19b6..01240ae 100644
>> --- a/drivers/iio/adc/ad7266.c
>> +++ b/drivers/iio/adc/ad7266.c
>> @@ -154,12 +154,11 @@ static int ad7266_read_raw(struct iio_dev *indio_dev,
>>
>>         switch (m) {
>>         case IIO_CHAN_INFO_RAW:
>> -               if (iio_buffer_enabled(indio_dev))
>> -                       return -EBUSY;
>> -
>> -               ret = ad7266_read_single(st, val, chan->address);
>> +               ret = iio_device_claim_direct_mode(indio_dev);
>>                 if (ret)
>>                         return ret;
>> +               ret = ad7266_read_single(st, val, chan->address);
>> +               iio_device_release_direct_mode(indio_dev);
>>
>>                 *val = (*val >> 2) & 0xfff;
>>                 if (chan->scan_type.sign == 's')
>> --
> --
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