Commit b24150e3 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio:adis16400: Increase samplerate precession 



The devices supported by this drivers support sample rates with less than one
sample per second. To support this increase the samplerate precession to allow
setting (and reading) the samplerate with a milli-HZ precession.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent d6b09bd8

drivers/iio/imu/adis16400_core.c

+18 −14
Original line number Diff line number Diff line
@@ -53,16 +53,15 @@ static int adis16334_get_freq(struct adis16400_state *st) 


	t >>= ADIS16334_RATE_DIV_SHIFT;



	return (8192 >> t) / 10;

	return 819200 >> t;

}



static int adis16334_set_freq(struct adis16400_state *st, unsigned int freq)

{

	unsigned int t;



	freq *= 10;

	if (freq < 8192)

		t = ilog2(8192 / freq);

	if (freq < 819200)

		t = ilog2(819200 / freq);

	else

		t = 0;
@@ -84,7 +83,7 @@ static int adis16400_get_freq(struct adis16400_state *st) 
	if (ret < 0)

		return ret;



	sps = (t & ADIS16400_SMPL_PRD_TIME_BASE) ? 53 : 1638;

	sps = (t & ADIS16400_SMPL_PRD_TIME_BASE) ? 52851 : 1638404;

	sps /= (t & ADIS16400_SMPL_PRD_DIV_MASK) + 1;



	return sps;
@@ -94,7 +93,7 @@ static int adis16400_set_freq(struct adis16400_state *st, unsigned int freq) 
{

	unsigned int t;



	t = 1638 / freq;

	t = 1638404 / freq;

	if (t > 0)

		t--;

	t &= ADIS16400_SMPL_PRD_DIV_MASK;
@@ -119,7 +118,7 @@ static ssize_t adis16400_read_frequency(struct device *dev, 
	if (ret < 0)

		return ret;



	return sprintf(buf, "%d\n", ret);

	return sprintf(buf, "%d.%.3d\n", ret / 1000, ret % 1000);

}



static const unsigned adis16400_3db_divisors[] = {
@@ -158,14 +157,16 @@ static ssize_t adis16400_write_frequency(struct device *dev, 
{

	struct iio_dev *indio_dev = dev_to_iio_dev(dev);

	struct adis16400_state *st = iio_priv(indio_dev);

	long val;

	int i, f, val;

	int ret;



	ret = kstrtol(buf, 10, &val);

	ret = iio_str_to_fixpoint(buf, 100, &i, &f);

	if (ret)

		return ret;



	if (val == 0)

	val = i * 1000 + f;



	if (val <= 0)

		return -EINVAL;



	mutex_lock(&indio_dev->mlock);
@@ -281,7 +282,8 @@ static int adis16400_write_raw(struct iio_dev *indio_dev, 
			return sps;

		}



		ret = adis16400_set_filter(indio_dev, sps, val);

		ret = adis16400_set_filter(indio_dev, sps,

			val * 1000 + val2 / 1000);

		mutex_unlock(&indio_dev->mlock);

		return ret;

	default:
@@ -355,9 +357,11 @@ static int adis16400_read_raw(struct iio_dev *indio_dev, 
			return ret;

		}

		ret = st->variant->get_freq(st);

		if (ret >= 0)

			*val = ret / adis16400_3db_divisors[val16 & 0x07];

		*val2 = 0;

		if (ret >= 0) {

			ret /= adis16400_3db_divisors[val16 & 0x07];

			*val = ret / 1000;

			*val2 = (ret % 1000) * 1000;

		}

		mutex_unlock(&indio_dev->mlock);

		if (ret < 0)

			return ret;

CRA Git | Maintained and supported by SUSTech CRA and CCSE