| Message ID | 20240817143647.15998-1-aardelean@baylibre.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | [v2] iio: adc: ad7606: move 'val' pointer to ad7606_scan_direct() | expand |
On Sat, 17 Aug 2024 17:36:47 +0300 Alexandru Ardelean <aardelean@baylibre.com> wrote: > The ad7606_scan_direct() function returns 'int', which is fine for 16-bit > samples. > But when going to 18-bit samples, these need to be implemented as 32-bit > (or int) type. > > In that case when getting samples (which can be negative), we'd get random > error codes. > So, the easiest thing is to just move the 'val' pointer to > 'ad7606_scan_direct()'. This doesn't qualify as a fix, it's just a > preparation for 18-bit ADCs (of the AD7606 family). Send it at the start of that series then so as not to confuse me :) > > Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com> > --- > drivers/iio/adc/ad7606.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c > index dba1f28782e4..68481e97e50a 100644 > --- a/drivers/iio/adc/ad7606.c > +++ b/drivers/iio/adc/ad7606.c > @@ -138,7 +138,8 @@ static irqreturn_t ad7606_trigger_handler(int irq, void *p) > return IRQ_HANDLED; > } > > -static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch) > +static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch, > + int *val) > { > struct ad7606_state *st = iio_priv(indio_dev); > int ret; > @@ -153,7 +154,7 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch) > > ret = ad7606_read_samples(st); > if (ret == 0) > - ret = st->data[ch]; > + *val = (short)st->data[ch]; I'd rather see a sign_extend32() for that seeing as you are touching the code. obviously it's the same thing but nicer to read! > > error_ret: > gpiod_set_value(st->gpio_convst, 0); > @@ -173,10 +174,9 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, > switch (m) { > case IIO_CHAN_INFO_RAW: > iio_device_claim_direct_scoped(return -EBUSY, indio_dev) { > - ret = ad7606_scan_direct(indio_dev, chan->address); > + ret = ad7606_scan_direct(indio_dev, chan->address, val); > if (ret < 0) > return ret; > - *val = (short) ret; > return IIO_VAL_INT; > } > unreachable();
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index dba1f28782e4..68481e97e50a 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -138,7 +138,8 @@ static irqreturn_t ad7606_trigger_handler(int irq, void *p) return IRQ_HANDLED; } -static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch) +static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch, + int *val) { struct ad7606_state *st = iio_priv(indio_dev); int ret; @@ -153,7 +154,7 @@ static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch) ret = ad7606_read_samples(st); if (ret == 0) - ret = st->data[ch]; + *val = (short)st->data[ch]; error_ret: gpiod_set_value(st->gpio_convst, 0); @@ -173,10 +174,9 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, switch (m) { case IIO_CHAN_INFO_RAW: iio_device_claim_direct_scoped(return -EBUSY, indio_dev) { - ret = ad7606_scan_direct(indio_dev, chan->address); + ret = ad7606_scan_direct(indio_dev, chan->address, val); if (ret < 0) return ret; - *val = (short) ret; return IIO_VAL_INT; } unreachable();
The ad7606_scan_direct() function returns 'int', which is fine for 16-bit samples. But when going to 18-bit samples, these need to be implemented as 32-bit (or int) type. In that case when getting samples (which can be negative), we'd get random error codes. So, the easiest thing is to just move the 'val' pointer to 'ad7606_scan_direct()'. This doesn't qualify as a fix, it's just a preparation for 18-bit ADCs (of the AD7606 family). Signed-off-by: Alexandru Ardelean <aardelean@baylibre.com> --- drivers/iio/adc/ad7606.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)