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iio: imu: adis16400: rework locks using ADIS library's state lock

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This change removes the use of indio_dev's mlock in favor using the state
lock from the ADIS library.

The set_freq() & get_freq() hooks are unlocked, so they require specific
locking. That is because in some cases the get_freq() hook is used in
combination with adis16400_set_filter().

In cases where only one read/write is done, the functions that hold the
state lock are used.

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 15:24:18 +02:00 committed by Jonathan Cameron
parent c5485a5d6a
commit ce476cd18a
1 changed files with 25 additions and 26 deletions
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51
drivers/iio/imu/adis16400.c
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@ -162,6 +162,7 @@ struct adis16400_chip_info {
unsigned int accel_scale_micro;
int temp_scale_nano;
int temp_offset;
/* set_freq() & get_freq() need to avoid using ADIS lib's state lock */
int (*set_freq)(struct adis16400_state *st, unsigned int freq);
int (*get_freq)(struct adis16400_state *st);
};
@ -326,7 +327,7 @@ static int adis16334_get_freq(struct adis16400_state *st)
int ret;
uint16_t t;
ret = adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
ret = __adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
if (ret)
return ret;
@ -350,7 +351,7 @@ static int adis16334_set_freq(struct adis16400_state *st, unsigned int freq)
t <<= ADIS16334_RATE_DIV_SHIFT;
t |= ADIS16334_RATE_INT_CLK;
return adis_write_reg_16(&st->adis, ADIS16400_SMPL_PRD, t);
return __adis_write_reg_16(&st->adis, ADIS16400_SMPL_PRD, t);
}
static int adis16400_get_freq(struct adis16400_state *st)
@ -358,7 +359,7 @@ static int adis16400_get_freq(struct adis16400_state *st)
int sps, ret;
uint16_t t;
ret = adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
ret = __adis_read_reg_16(&st->adis, ADIS16400_SMPL_PRD, &t);
if (ret)
return ret;
@ -390,7 +391,7 @@ static int adis16400_set_freq(struct adis16400_state *st, unsigned int freq)
else
st->adis.spi->max_speed_hz = ADIS16400_SPI_FAST;
return adis_write_reg_8(&st->adis, ADIS16400_SMPL_PRD, val);
return __adis_write_reg_8(&st->adis, ADIS16400_SMPL_PRD, val);
}
static const unsigned int adis16400_3db_divisors[] = {
@ -404,7 +405,7 @@ static const unsigned int adis16400_3db_divisors[] = {
[7] = 200, /* Not a valid setting */
};
static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
static int __adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
{
struct adis16400_state *st = iio_priv(indio_dev);
uint16_t val16;
@ -415,11 +416,11 @@ static int adis16400_set_filter(struct iio_dev *indio_dev, int sps, int val)
break;
}
ret = adis_read_reg_16(&st->adis, ADIS16400_SENS_AVG, &val16);
ret = __adis_read_reg_16(&st->adis, ADIS16400_SENS_AVG, &val16);
if (ret)
return ret;
ret = adis_write_reg_16(&st->adis, ADIS16400_SENS_AVG,
ret = __adis_write_reg_16(&st->adis, ADIS16400_SENS_AVG,
(val16 & ~0x07) | i);
return ret;
}
@ -507,32 +508,31 @@ static int adis16400_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2, long info)
{
struct adis16400_state *st = iio_priv(indio_dev);
struct mutex *slock = &st->adis.state_lock;
int ret, sps;
switch (info) {
case IIO_CHAN_INFO_CALIBBIAS:
mutex_lock(&indio_dev->mlock);
ret = adis_write_reg_16(&st->adis,
adis16400_addresses[chan->scan_index], val);
mutex_unlock(&indio_dev->mlock);
return ret;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
/*
* Need to cache values so we can update if the frequency
* changes.
*/
mutex_lock(&indio_dev->mlock);
mutex_lock(slock);
st->filt_int = val;
/* Work out update to current value */
sps = st->variant->get_freq(st);
if (sps < 0) {
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
return sps;
}
ret = adis16400_set_filter(indio_dev, sps,
ret = __adis16400_set_filter(indio_dev, sps,
val * 1000 + val2 / 1000);
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
sps = val * 1000 + val2 / 1000;
@ -540,9 +540,9 @@ static int adis16400_write_raw(struct iio_dev *indio_dev,
if (sps <= 0)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
mutex_lock(slock);
ret = st->variant->set_freq(st, sps);
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
return ret;
default:
return -EINVAL;
@ -553,6 +553,7 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val, int *val2, long info)
{
struct adis16400_state *st = iio_priv(indio_dev);
struct mutex *slock = &st->adis.state_lock;
int16_t val16;
int ret;
@ -596,10 +597,8 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
case IIO_CHAN_INFO_CALIBBIAS:
mutex_lock(&indio_dev->mlock);
ret = adis_read_reg_16(&st->adis,
adis16400_addresses[chan->scan_index], &val16);
mutex_unlock(&indio_dev->mlock);
if (ret)
return ret;
val16 = sign_extend32(val16, 11);
@ -610,27 +609,27 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
*val = st->variant->temp_offset;
return IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
mutex_lock(&indio_dev->mlock);
mutex_lock(slock);
/* Need both the number of taps and the sampling frequency */
ret = adis_read_reg_16(&st->adis,
ret = __adis_read_reg_16(&st->adis,
ADIS16400_SENS_AVG,
&val16);
if (ret) {
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
return ret;
}
ret = st->variant->get_freq(st);
if (ret >= 0) {
ret /= adis16400_3db_divisors[val16 & 0x07];
*val = ret / 1000;
*val2 = (ret % 1000) * 1000;
}
mutex_unlock(&indio_dev->mlock);
mutex_unlock(slock);
if (ret)
return ret;
ret /= adis16400_3db_divisors[val16 & 0x07];
*val = ret / 1000;
*val2 = (ret % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
mutex_lock(slock);
ret = st->variant->get_freq(st);
mutex_unlock(slock);
if (ret)
return ret;
*val = ret / 1000;