From bdb20bdb8c1ea55c9a2f744cc5b2c7f66148a41b Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 16 Jan 2013 12:48:00 +0000 Subject: [PATCH] staging:iio:adis16400: Fix and cleanup 3db filter setting The 3db divisors table is partially wrong and incomplete. Also the code rounds up to the next higher frequency if the requested frequency would matches one of the available frequencies. These two issues are fixed by this patch. The patch also changes the driver to round down the filter frequency if it is larger than the largest supported frequency instead of rejecting it as an invalid value. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/staging/iio/imu/adis16400_core.c | 41 ++++++++++++------------ 1 file changed, 20 insertions(+), 21 deletions(-) diff --git a/drivers/staging/iio/imu/adis16400_core.c b/drivers/staging/iio/imu/adis16400_core.c index cb6622578e9b..7114de94f412 100644 --- a/drivers/staging/iio/imu/adis16400_core.c +++ b/drivers/staging/iio/imu/adis16400_core.c @@ -242,33 +242,32 @@ static ssize_t adis16400_read_frequency(struct device *dev, static const unsigned adis16400_3db_divisors[] = { [0] = 2, /* Special case */ - [1] = 5, - [2] = 10, - [3] = 50, - [4] = 200, + [1] = 6, + [2] = 12, + [3] = 25, + [4] = 50, + [5] = 100, + [6] = 200, + [7] = 200, /* Not a valid setting */ }; static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val) { int i, ret; u16 val16; - for (i = ARRAY_SIZE(adis16400_3db_divisors) - 1; i >= 0; i--) - if (sps/adis16400_3db_divisors[i] > val) + + for (i = ARRAY_SIZE(adis16400_3db_divisors) - 1; i >= 1; i--) { + if (sps / adis16400_3db_divisors[i] >= val) break; - if (i == -1) - ret = -EINVAL; - else { - ret = adis16400_spi_read_reg_16(indio_dev, - ADIS16400_SENS_AVG, + } + + ret = adis16400_spi_read_reg_16(indio_dev, ADIS16400_SENS_AVG, &val16); - if (ret < 0) - goto error_ret; + if (ret < 0) + return ret; - ret = adis16400_spi_write_reg_16(indio_dev, - ADIS16400_SENS_AVG, - (val16 & ~0x03) | i); - } -error_ret: + ret = adis16400_spi_write_reg_16(indio_dev, ADIS16400_SENS_AVG, + (val16 & ~0x07) | i); return ret; } @@ -653,9 +652,9 @@ static int adis16400_read_raw(struct iio_dev *indio_dev, mutex_unlock(&indio_dev->mlock); return ret; } - val16 = st->variant->get_freq(indio_dev); - if (ret > 0) - *val = ret/adis16400_3db_divisors[val16 & 0x03]; + ret = st->variant->get_freq(indio_dev); + if (ret >= 0) + *val = ret / adis16400_3db_divisors[val16 & 0x07]; *val2 = 0; mutex_unlock(&indio_dev->mlock); if (ret < 0) -- 2.20.1