From: Zubair Lutfullah <zubair.lutfullah@gmail.com>
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
Subject: [PATCH 2/3] iio: ti_am335x_adc: optimize memory usage
Date: Thu, 19 Sep 2013 11:24:34 +0500 [thread overview]
Message-ID: <1379571876-12420-3-git-send-email-zubair.lutfullah@gmail.com> (raw)
In-Reply-To: <1379571876-12420-1-git-send-email-zubair.lutfullah@gmail.com>
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 <zubair.lutfullah@gmail.com>
---
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
next prev parent reply other threads:[~2013-09-19 6:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-19 6:24 [PATCH V11 0/3] iio: input: ti_am335x_adc: Add continuous sampling support Zubair Lutfullah
2013-09-19 6:24 ` [PATCH 1/3] input: ti_am335x_tsc: Enable shared IRQ for TSC Zubair Lutfullah
2013-09-19 6:24 ` Zubair Lutfullah [this message]
2013-09-19 6:24 ` [PATCH 3/3] iio: ti_am335x_adc: Add continuous sampling support Zubair Lutfullah
2013-09-21 18:28 ` Jonathan Cameron
2013-09-22 4:46 ` Zubair Lutfullah :
2013-09-22 4:46 ` Zubair Lutfullah :
2013-09-21 10:52 ` [PATCH V11 0/3] iio: input: " Jonathan Cameron
2013-09-22 4:42 ` Zubair Lutfullah :
2013-09-22 4:42 ` Zubair Lutfullah :
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