From: Lars-Peter Clausen <lars@metafoo.de>
To: Jonathan Cameron <jic23@cam.ac.uk>
Cc: linux-iio@vger.kernel.org,
device-drivers-devel@blackfin.uclinux.org, drivers@analog.com,
Lars-Peter Clausen <lars@metafoo.de>
Subject: [PATCH v2 09/11] staging:iio:dac:ad5446: Return cached value for 'raw' attribute
Date: Tue, 24 Apr 2012 18:49:39 +0200 [thread overview]
Message-ID: <1335286181-20474-9-git-send-email-lars@metafoo.de> (raw)
In-Reply-To: <1335286181-20474-1-git-send-email-lars@metafoo.de>
We can not read back the value from the device, but we cache the value anyway so
we might as well return the cached value instead of an error.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
drivers/staging/iio/dac/ad5446.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c
index 731cd05..9dc67c8 100644
--- a/drivers/staging/iio/dac/ad5446.c
+++ b/drivers/staging/iio/dac/ad5446.c
@@ -229,6 +229,9 @@ static int ad5446_read_raw(struct iio_dev *indio_dev,
unsigned long scale_uv;
switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ *val = st->cached_val;
+ return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
*val = scale_uv / 1000;
--
1.7.9.5
next prev parent reply other threads:[~2012-04-24 16:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-24 16:49 [PATCH v2 01/11] staging:iio:dac:ad5446: Do not exit powerdown when writing a sample Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 02/11] staging:iio:dac:ad5446: Remove duplicated write sample functions Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 03/11] staging:iio:dac:ad5446: Fix 24bit transfers Lars-Peter Clausen
2012-04-24 16:55 ` Jonathan Cameron
2012-04-24 16:49 ` [PATCH v2 04/11] staging:iio:dac:ad5446: Remove unused struct field Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 05/11] staging:iio:dac:ad5446: Do not check for individual chip ids in probe Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 06/11] staging:iio:dac:ad5446: Remove duplicated chip_info entries Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 07/11] staging:iio:dac:ad5446: Convert to extended channel attributes Lars-Peter Clausen
2012-04-24 16:49 ` [PATCH v2 08/11] staging:iio:dac:ad5446: Consolidate store_sample and store_pwr_down functions Lars-Peter Clausen
2012-04-24 16:56 ` Jonathan Cameron
2012-04-24 16:49 ` Lars-Peter Clausen [this message]
2012-04-24 16:56 ` [PATCH v2 09/11] staging:iio:dac:ad5446: Return cached value for 'raw' attribute Jonathan Cameron
2012-04-24 16:49 ` [PATCH v2 10/11] staging:iio:dac:ad5446: Add support for the AD5662 Lars-Peter Clausen
2012-04-24 16:57 ` Jonathan Cameron
2012-04-24 16:49 ` [PATCH v2 11/11] staging:iio:dac:ad5446: Update Kconfig entry Lars-Peter Clausen
2012-04-24 16:58 ` Jonathan Cameron
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