From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out-085.synserver.de ([212.40.185.85]:1071 "EHLO smtp-out-078.synserver.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753547Ab2DWRtT (ORCPT ); Mon, 23 Apr 2012 13:49:19 -0400 From: Lars-Peter Clausen To: Jonathan Cameron Cc: linux-iio@vger.kernel.org, device-drivers-devel@blackfin.uclinux.org, drivers@analog.com, Lars-Peter Clausen Subject: [PATCH 1/8] staging:iio:dac:ad5446: Do not exit powerdown when writing a sample Date: Mon, 23 Apr 2012 19:51:30 +0200 Message-Id: <1335203497-11041-1-git-send-email-lars@metafoo.de> Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org Both the powerdown mode bits and the sample value are stored in the same register, so writing a sample while the device is powered down will clear the power down bits. To avoid this only update the cached value when the device is powered down. Signed-off-by: Lars-Peter Clausen --- drivers/staging/iio/dac/ad5446.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c index ec6968b..0cfe445 100644 --- a/drivers/staging/iio/dac/ad5446.c +++ b/drivers/staging/iio/dac/ad5446.c @@ -282,7 +282,8 @@ static int ad5446_write_raw(struct iio_dev *indio_dev, val <<= chan->scan_type.shift; mutex_lock(&indio_dev->mlock); st->cached_val = val; - st->chip_info->store_sample(st, val); + if (!st->pwr_down) + st->chip_info->store_sample(st, val); ret = spi_sync(st->spi, &st->msg); mutex_unlock(&indio_dev->mlock); break; -- 1.7.9.5