From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zubair Lutfullah Subject: [PATCH 2/3] iio: ti_am335x_adc: optimize memory usage Date: Thu, 19 Sep 2013 11:24:34 +0500 Message-ID: <1379571876-12420-3-git-send-email-zubair.lutfullah@gmail.com> References: <1379571876-12420-1-git-send-email-zubair.lutfullah@gmail.com> Return-path: In-Reply-To: <1379571876-12420-1-git-send-email-zubair.lutfullah@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: jic23@cam.ac.uk, dmitry.torokhov@gmail.com Cc: linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bigeasy@linutronix.de, gregkh@linuxfoundation.org, zubair.lutfullah@gmail.com List-Id: linux-input@vger.kernel.org 12 bit ADC data is stored in 32 bits of storage. Change from u32 to u16 to reduce wasted memory. Signed-off-by: Zubair Lutfullah --- drivers/iio/adc/ti_am335x_adc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index a952538..ebe93eb 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -122,7 +122,7 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels) chan->datasheet_name = chan_name_ain[chan->channel]; chan->scan_type.sign = 'u'; chan->scan_type.realbits = 12; - chan->scan_type.storagebits = 32; + chan->scan_type.storagebits = 16; } indio_dev->channels = chan_array; @@ -186,7 +186,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, if (stepid == map_val) { read = read & FIFOREAD_DATA_MASK; found = true; - *val = read; + *val = (u16) read; } } -- 1.7.9.5