[PATCH 0/3] ROHM BUxxx light sensor fixes

[PATCH 0/3] ROHM BUxxx light sensor fixes

[Matti Vaittinen]

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A couple of fixes to newly introduced light sensor drivers.

The patch 1/N "iio: light: bu27034: Fix scale format" should be applied
as a fix because the bu27034 is already merged upstream. Please note
that there are already a few fixes to bu27034 in fixes-togreg.

The patches 2/N and 3/N can be taken in as "new features" because the
bu27008 has not yet been merged upstream.

Please, let me know if you want me to split the series and rebase the
bu27034 fix on top of the fixes-togreg (or some other base).



Matti Vaittinen (3):
  iio: light: bu27034: Fix scale format
  iio: light: bu27008: Fix scale format
  iio: light: bu27008: Fix intensity data type

 drivers/iio/light/rohm-bu27008.c | 22 +++++++++++++++++++---
 drivers/iio/light/rohm-bu27034.c | 22 +++++++++++++++++++---
 2 files changed, 38 insertions(+), 6 deletions(-)


base-commit: 0cf9a77e80fa48e4392e408f8660e93c080cb78d
-- 
2.40.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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[PATCH 1/3] iio: light: bu27034: Fix scale format

[Matti Vaittinen]

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The driver is expecting accuracy of NANOs for intensity scale in
raw_write. The IIO core is however defaulting to MICROs. This leads the
raw-write of smallest scales to never succeed as correct selector(s) are
not found.

Fix this by implementing the .write_raw_get_fmt callback to use NANO
accuracy for writes of IIO_CHAN_INFO_SCALE.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Fixes: e52afbd61039 ("iio: light: ROHM BU27034 Ambient Light Sensor")
---
 drivers/iio/light/rohm-bu27034.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/light/rohm-bu27034.c b/drivers/iio/light/rohm-bu27034.c
index 846c3d43aa34..f737d62bdf92 100644
--- a/drivers/iio/light/rohm-bu27034.c
+++ b/drivers/iio/light/rohm-bu27034.c
@@ -572,7 +572,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
 		return -EINVAL;
 
 	if (chan == BU27034_CHAN_ALS) {
-		if (val == 0 && val2 == 1000)
+		if (val == 0 && val2 == 1000000)
 			return 0;
 
 		return -EINVAL;
@@ -584,7 +584,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
 		goto unlock_out;
 
 	ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, time_sel,
-						val, val2 * 1000, &gain_sel);
+						val, val2, &gain_sel);
 	if (ret) {
 		/*
 		 * Could not support scale with given time. Need to change time.
@@ -621,7 +621,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
 
 			/* Can we provide requested scale with this time? */
 			ret = iio_gts_find_gain_sel_for_scale_using_time(
-				&data->gts, new_time_sel, val, val2 * 1000,
+				&data->gts, new_time_sel, val, val2,
 				&gain_sel);
 			if (ret)
 				continue;
@@ -1213,6 +1213,21 @@ static int bu27034_read_raw(struct iio_dev *idev,
 	}
 }
 
+static int bu27034_write_raw_get_fmt(struct iio_dev *indio_dev,
+				     struct iio_chan_spec const *chan,
+				     long mask)
+{
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_INT_TIME:
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int bu27034_write_raw(struct iio_dev *idev,
 			     struct iio_chan_spec const *chan,
 			     int val, int val2, long mask)
@@ -1260,6 +1275,7 @@ static int bu27034_read_avail(struct iio_dev *idev,
 static const struct iio_info bu27034_info = {
 	.read_raw = &bu27034_read_raw,
 	.write_raw = &bu27034_write_raw,
+	.write_raw_get_fmt = &bu27034_write_raw_get_fmt,
 	.read_avail = &bu27034_read_avail,
 };
 
-- 
2.40.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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Re: [PATCH 1/3] iio: light: bu27034: Fix scale format

[Jonathan Cameron]

On Tue, 13 Jun 2023 12:34:36 +0300
Matti Vaittinen <mazziesaccount@gmail.com> wrote:

> The driver is expecting accuracy of NANOs for intensity scale in
> raw_write. The IIO core is however defaulting to MICROs. This leads the
> raw-write of smallest scales to never succeed as correct selector(s) are
> not found.
> 
> Fix this by implementing the .write_raw_get_fmt callback to use NANO
> accuracy for writes of IIO_CHAN_INFO_SCALE.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> Fixes: e52afbd61039 ("iio: light: ROHM BU27034 Ambient Light Sensor")
Applied to the fixes-togreg branch of iio.git

Note however that the fixes-togreg branch has moved on to a 'post merge window'
state as the last lot of fixes are in char-misc-next (not char-misc-linus)
and hence targetting the merge window.

As such I will be holding these locally for a while as if I push them out
it will make a mess of the ordering of branches merged into linux-next

Jonathan

> ---
>  drivers/iio/light/rohm-bu27034.c | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/light/rohm-bu27034.c b/drivers/iio/light/rohm-bu27034.c
> index 846c3d43aa34..f737d62bdf92 100644
> --- a/drivers/iio/light/rohm-bu27034.c
> +++ b/drivers/iio/light/rohm-bu27034.c
> @@ -572,7 +572,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
>  		return -EINVAL;
>  
>  	if (chan == BU27034_CHAN_ALS) {
> -		if (val == 0 && val2 == 1000)
> +		if (val == 0 && val2 == 1000000)
>  			return 0;
>  
>  		return -EINVAL;
> @@ -584,7 +584,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
>  		goto unlock_out;
>  
>  	ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, time_sel,
> -						val, val2 * 1000, &gain_sel);
> +						val, val2, &gain_sel);
>  	if (ret) {
>  		/*
>  		 * Could not support scale with given time. Need to change time.
> @@ -621,7 +621,7 @@ static int bu27034_set_scale(struct bu27034_data *data, int chan,
>  
>  			/* Can we provide requested scale with this time? */
>  			ret = iio_gts_find_gain_sel_for_scale_using_time(
> -				&data->gts, new_time_sel, val, val2 * 1000,
> +				&data->gts, new_time_sel, val, val2,
>  				&gain_sel);
>  			if (ret)
>  				continue;
> @@ -1213,6 +1213,21 @@ static int bu27034_read_raw(struct iio_dev *idev,
>  	}
>  }
>  
> +static int bu27034_write_raw_get_fmt(struct iio_dev *indio_dev,
> +				     struct iio_chan_spec const *chan,
> +				     long mask)
> +{
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		return IIO_VAL_INT_PLUS_NANO;
> +	case IIO_CHAN_INFO_INT_TIME:
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
>  static int bu27034_write_raw(struct iio_dev *idev,
>  			     struct iio_chan_spec const *chan,
>  			     int val, int val2, long mask)
> @@ -1260,6 +1275,7 @@ static int bu27034_read_avail(struct iio_dev *idev,
>  static const struct iio_info bu27034_info = {
>  	.read_raw = &bu27034_read_raw,
>  	.write_raw = &bu27034_write_raw,
> +	.write_raw_get_fmt = &bu27034_write_raw_get_fmt,
>  	.read_avail = &bu27034_read_avail,
>  };
>  

[PATCH 2/3] iio: light: bu27008: Fix scale format

[Matti Vaittinen]

[-- Attachment #1: Type: text/plain, Size: 2842 bytes --]

The driver is expecting accuracy of NANOs for intensity scale in
raw_write. The IIO core is however defaulting to MICROs. This leads the
raw-write of smallest scales to never succeed as correct selector(s) are
not found.

Fix this by implementing the .write_raw_get_fmt callback to use NANO
accuracy for writes of IIO_CHAN_INFO_SCALE.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>

---
Fixes tag not added because AFACS the bu27008 is not yet in any releases.
---
 drivers/iio/light/rohm-bu27008.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/light/rohm-bu27008.c b/drivers/iio/light/rohm-bu27008.c
index 489902bed7f0..80eb14ea8193 100644
--- a/drivers/iio/light/rohm-bu27008.c
+++ b/drivers/iio/light/rohm-bu27008.c
@@ -633,7 +633,7 @@ static int bu27008_try_find_new_time_gain(struct bu27008_data *data, int val,
 	for (i = 0; i < data->gts.num_itime; i++) {
 		new_time_sel = data->gts.itime_table[i].sel;
 		ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts,
-					new_time_sel, val, val2 * 1000, gain_sel);
+					new_time_sel, val, val2, gain_sel);
 		if (!ret)
 			break;
 	}
@@ -662,7 +662,7 @@ static int bu27008_set_scale(struct bu27008_data *data,
 		goto unlock_out;
 
 	ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, time_sel,
-						val, val2 * 1000, &gain_sel);
+						val, val2, &gain_sel);
 	if (ret) {
 		ret = bu27008_try_find_new_time_gain(data, val, val2, &gain_sel);
 		if (ret)
@@ -677,6 +677,21 @@ static int bu27008_set_scale(struct bu27008_data *data,
 	return ret;
 }
 
+static int bu27008_write_raw_get_fmt(struct iio_dev *indio_dev,
+				     struct iio_chan_spec const *chan,
+				     long mask)
+{
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_INT_TIME:
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int bu27008_write_raw(struct iio_dev *idev,
 			     struct iio_chan_spec const *chan,
 			     int val, int val2, long mask)
@@ -756,6 +771,7 @@ static int bu27008_update_scan_mode(struct iio_dev *idev,
 static const struct iio_info bu27008_info = {
 	.read_raw = &bu27008_read_raw,
 	.write_raw = &bu27008_write_raw,
+	.write_raw_get_fmt = &bu27008_write_raw_get_fmt,
 	.read_avail = &bu27008_read_avail,
 	.update_scan_mode = bu27008_update_scan_mode,
 	.validate_trigger = iio_validate_own_trigger,
-- 
2.40.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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[PATCH 3/3] iio: light: bu27008: Fix intensity data type

[Matti Vaittinen]

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The intensity data from bu27008 is unsigned. The type of the scan data
was incorrectly marked as signed resulting large intensity values to be
interpreted as negative ones.

Fix the scan data type.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>

---
Fixes tag not added because AFACS the bu27008 is not yet in any releases.
---
 drivers/iio/light/rohm-bu27008.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/light/rohm-bu27008.c b/drivers/iio/light/rohm-bu27008.c
index 80eb14ea8193..b50bf8973d9a 100644
--- a/drivers/iio/light/rohm-bu27008.c
+++ b/drivers/iio/light/rohm-bu27008.c
@@ -190,7 +190,7 @@ static const struct iio_itime_sel_mul bu27008_itimes[] = {
 	.address = BU27008_REG_##data##_LO,					\
 	.scan_index = BU27008_##color,						\
 	.scan_type = {								\
-		.sign = 's',							\
+		.sign = 'u',							\
 		.realbits = 16,							\
 		.storagebits = 16,						\
 		.endianness = IIO_LE,						\
-- 
2.40.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH 3/3] iio: light: bu27008: Fix intensity data type

[Jonathan Cameron]

On Tue, 13 Jun 2023 12:35:12 +0300
Matti Vaittinen <mazziesaccount@gmail.com> wrote:

> The intensity data from bu27008 is unsigned. The type of the scan data
> was incorrectly marked as signed resulting large intensity values to be
> interpreted as negative ones.
> 
> Fix the scan data type.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Applied series to the fixes-togreg branch of iio.git (which now includes
this as it's upstream in char-misc-next)  Added fixes tags where needed given
the ids are now stable

Thanks,
Jonathan

> 
> ---
> Fixes tag not added because AFACS the bu27008 is not yet in any releases.
> ---
>  drivers/iio/light/rohm-bu27008.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/light/rohm-bu27008.c b/drivers/iio/light/rohm-bu27008.c
> index 80eb14ea8193..b50bf8973d9a 100644
> --- a/drivers/iio/light/rohm-bu27008.c
> +++ b/drivers/iio/light/rohm-bu27008.c
> @@ -190,7 +190,7 @@ static const struct iio_itime_sel_mul bu27008_itimes[] = {
>  	.address = BU27008_REG_##data##_LO,					\
>  	.scan_index = BU27008_##color,						\
>  	.scan_type = {								\
> -		.sign = 's',							\
> +		.sign = 'u',							\
>  		.realbits = 16,							\
>  		.storagebits = 16,						\
>  		.endianness = IIO_LE,						\