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iio: gyro: adis16136: rework locks using ADIS library's state lock

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This replaces indio_dev's mlock with the state lock/mutex from the ADIS
library.

The __adis16136_get_freq() function has been prefixed to mark it as
unlocked. The adis16136_{set,get}_filter() functions now hold the state
lock for all the ops that they do.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2019-11-22 15:24:19 +02:00 committed by Jonathan Cameron
parent ce476cd18a
commit 0aee99a1ea
1 changed files with 21 additions and 10 deletions
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31
drivers/iio/gyro/adis16136.c
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@ -185,12 +185,12 @@ static int adis16136_set_freq(struct adis16136 *adis16136, unsigned int freq)
return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, t);
}
static int adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
static int __adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
{
uint16_t t;
int ret;
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
if (ret)
return ret;
@ -224,10 +224,13 @@ static ssize_t adis16136_read_frequency(struct device *dev,
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct adis16136 *adis16136 = iio_priv(indio_dev);
struct mutex *slock = &adis16136->adis.state_lock;
unsigned int freq;
int ret;
ret = adis16136_get_freq(adis16136, &freq);
mutex_lock(slock);
ret = __adis16136_get_freq(adis16136, &freq);
mutex_unlock(slock);
if (ret)
return ret;
@ -252,42 +255,50 @@ static const unsigned adis16136_3db_divisors[] = {
static int adis16136_set_filter(struct iio_dev *indio_dev, int val)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
struct mutex *slock = &adis16136->adis.state_lock;
unsigned int freq;
int i, ret;
ret = adis16136_get_freq(adis16136, &freq);
mutex_lock(slock);
ret = __adis16136_get_freq(adis16136, &freq);
if (ret)
return ret;
goto out_unlock;
for (i = ARRAY_SIZE(adis16136_3db_divisors) - 1; i >= 1; i--) {
if (freq / adis16136_3db_divisors[i] >= val)
break;
}
return adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
ret = __adis_write_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, i);
out_unlock:
mutex_unlock(slock);
return ret;
}
static int adis16136_get_filter(struct iio_dev *indio_dev, int *val)
{
struct adis16136 *adis16136 = iio_priv(indio_dev);
struct mutex *slock = &adis16136->adis.state_lock;
unsigned int freq;
uint16_t val16;
int ret;
mutex_lock(&indio_dev->mlock);
mutex_lock(slock);
ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, &val16);
ret = __adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT,
&val16);
if (ret)
goto err_unlock;
ret = adis16136_get_freq(adis16136, &freq);
ret = __adis16136_get_freq(adis16136, &freq);
if (ret)
goto err_unlock;
*val = freq / adis16136_3db_divisors[val16 & 0x07];
err_unlock:
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
return ret ? ret : IIO_VAL_INT;
}