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Thu, 6 Dec 2018 05:53:23 -0800 Received: from mircea-Latitude-E6540.analog.com (10.50.1.101) by NWD2HUBCAS7.ad.analog.com (10.64.69.107) with Microsoft SMTP Server id 14.3.408.0; Thu, 6 Dec 2018 08:53:23 -0500 From: Mircea Caprioru To: CC: , , , , , , , , Mircea Caprioru Subject: [PATCH] iio: dac: ad5686: fix bit shift read register Date: Thu, 6 Dec 2018 15:53:15 +0200 Message-ID: <20181206135315.22805-1-mircea.caprioru@analog.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.57;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(376002)(346002)(39860400002)(136003)(396003)(2980300002)(199004)(189003)(53416004)(8676002)(106002)(8936002)(356004)(486006)(86362001)(6666004)(2351001)(106466001)(44832011)(50226002)(5660300001)(305945005)(77096007)(476003)(478600001)(26005)(186003)(2616005)(107886003)(4326008)(336012)(426003)(72206003)(50466002)(126002)(7636002)(2906002)(36756003)(6916009)(246002)(1076002)(16586007)(48376002)(7696005)(316002)(14444005)(47776003)(51416003)(54906003);DIR:OUT;SFP:1101;SCL:1;SRVR:CO2PR03MB2262;H:nwd2mta2.analog.com;FPR:;SPF:Pass;LANG:en;PTR:nwd2mail11.analog.com;A:1;MX:1; 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When the dac resolution was lower than the register size (ex. 12 bits out of 16 bits) the readback value was not shifted with the difference in bits and the value was higher. Also a mask is applied on the read value in order to get the value relative to the actual bit size. Fixes: 0357e488b8 ("iio:dac:ad5686: Refactor the driver") Signed-off-by: Mircea Caprioru --- drivers/iio/dac/ad5686.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c index 54ff76b93366..a332b93ca2c4 100644 --- a/drivers/iio/dac/ad5686.c +++ b/drivers/iio/dac/ad5686.c @@ -128,7 +128,8 @@ static int ad5686_read_raw(struct iio_dev *indio_dev, mutex_unlock(&indio_dev->mlock); if (ret < 0) return ret; - *val = ret; + *val = (ret >> chan->scan_type.shift) & + GENMASK(chan->scan_type.realbits - 1, 0); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = st->vref_mv; -- 2.17.1