[PATCH 0/5] ad7780,ad7791,ad7793: localize all IIO channel macro defs

[PATCH 0/5] ad7780,ad7791,ad7793: localize all IIO channel macro defs

[Alexandru Ardelean]

This patchset has 2 intents:
1. We've noticed with newer Sigma-Delta ADCs that the current standard
   macros (AD_SD_*_CHANNEL()) for defining IIO channels are too rigid when
   adding new parts that have some slight variations. Two examples that
   come to mind are AD7124 and AD7192; for the final version of the AD7192
   one requirement was to set 'IIO_CHAN_INFO_SCALE' to
   'info_mask_shared_by_type_available', which would require a new
   AD_SD_*_CHANNEL macro-set
2. Similarly to AD7192, for the AD7793 driver, there is a AD7797 part that
   doesn't need 'IIO_CHAN_INFO_SCALE' for
   'info_mask_shared_by_type_available'. While other parts do need it.
   But the biggest problem in the AD7793 driver, is that we're getting
   checkpatch patches that try to fix/break the
   'in_voltage-voltage_scale_available' sysfs attribute. So, to get that
   driver away from checkpatch's radar, the read_avail hook is used for
   AD7793.

This patchset comes with a bit of code duplication, but as it seems, this
duplication is easier to handle.

Alexandru Ardelean (5):
  iio: adc: ad7780: define/use own IIO channel macros
  iio: adc: ad7791: define/use own IIO channel macros
  iio: adc: ad7793: define/use own IIO channel macros
  iio: ad_sigma_delta: remove unused IIO channel macros
  iio: adc: ad7793: use read_avail iio hook for scale available

 drivers/iio/adc/ad7780.c               |  27 ++++-
 drivers/iio/adc/ad7791.c               |  62 +++++++++--
 drivers/iio/adc/ad7793.c               | 142 ++++++++++++++++++-------
 include/linux/iio/adc/ad_sigma_delta.h |  58 ----------
 4 files changed, 182 insertions(+), 107 deletions(-)

-- 
2.20.1

[PATCH 1/5] iio: adc: ad7780: define/use own IIO channel macros

[Alexandru Ardelean]

This change gets rid of the AD_SD_*_CHANNEL macros in favor of defining
it's own. The ad7780 is quite simpler than it's other Sigma-Delta brothers.

It turned out that centralizing the AD_SD_*_CHANNEL macros doesn't scale
too well, especially with some more complicated drivers. Some of the
variations in the more complicated drivers require new macros, and that way
things can become harder to maintain.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/ad7780.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index 291c1a898129..f47606ebbbbe 100644
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -206,10 +206,29 @@ static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
 	.irq_flags = IRQF_TRIGGER_LOW,
 };
 
-#define AD7780_CHANNEL(bits, wordsize) \
-	AD_SD_CHANNEL(1, 0, 0, bits, 32, (wordsize) - (bits))
-#define AD7170_CHANNEL(bits, wordsize) \
-	AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, (wordsize) - (bits))
+#define _AD7780_CHANNEL(_bits, _wordsize, _mask_all)		\
+{								\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = 0,						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
+		BIT(IIO_CHAN_INFO_OFFSET),			\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+	.info_mask_shared_by_all = _mask_all,			\
+	.scan_index = 1,					\
+	.scan_type = {						\
+		.sign = 'u',					\
+		.realbits = (_bits),				\
+		.storagebits = 32,				\
+		.shift = (_wordsize) - (_bits),			\
+		.endianness = IIO_BE,				\
+	},							\
+}
+
+#define AD7780_CHANNEL(_bits, _wordsize)	\
+	_AD7780_CHANNEL(_bits, _wordsize, BIT(IIO_CHAN_INFO_SAMP_FREQ))
+#define AD7170_CHANNEL(_bits, _wordsize)	\
+	_AD7780_CHANNEL(_bits, _wordsize, 0)
 
 static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
 	[ID_AD7170] = {
-- 
2.20.1

[PATCH 2/5] iio: adc: ad7791: define/use own IIO channel macros

[Alexandru Ardelean]

This driver seems to use most of the AD_SD_*_CHANNEL. This change will move
them in the driver. The intent is that if a new part comes along which
would require tweaks per IIO channel, these should be doable in the driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/ad7791.c | 62 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 55 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ad7791.c b/drivers/iio/adc/ad7791.c
index abb239392631..ba22808507d0 100644
--- a/drivers/iio/adc/ad7791.c
+++ b/drivers/iio/adc/ad7791.c
@@ -64,25 +64,73 @@
 #define AD7791_MODE_SEL_MASK		(0x3 << 6)
 #define AD7791_MODE_SEL(x)		((x) << 6)
 
+#define __AD7991_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+	_storagebits, _shift, _extend_name, _type, _mask_all) \
+	{ \
+		.type = (_type), \
+		.differential = (_channel2 == -1 ? 0 : 1), \
+		.indexed = 1, \
+		.channel = (_channel1), \
+		.channel2 = (_channel2), \
+		.address = (_address), \
+		.extend_name = (_extend_name), \
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			BIT(IIO_CHAN_INFO_OFFSET), \
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+		.info_mask_shared_by_all = _mask_all, \
+		.scan_index = (_si), \
+		.scan_type = { \
+			.sign = 'u', \
+			.realbits = (_bits), \
+			.storagebits = (_storagebits), \
+			.shift = (_shift), \
+			.endianness = IIO_BE, \
+		}, \
+	}
+
+#define AD7991_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7991_CHANNEL(_si, _channel, _channel, _address, _bits, \
+		_storagebits, _shift, "shorted", IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_CHANNEL(_si, _channel, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
+		_storagebits, _shift, NULL, IIO_VOLTAGE, \
+		 BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7991_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+		_storagebits, _shift, NULL, IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7991_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \
+	_shift) \
+	__AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
+		_storagebits, _shift, "supply", IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
 #define DECLARE_AD7787_CHANNELS(name, bits, storagebits) \
 const struct iio_chan_spec name[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
+	AD7991_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
 		(bits), (storagebits), 0), \
-	AD_SD_CHANNEL(1, 1, AD7791_CH_AIN2, (bits), (storagebits), 0), \
-	AD_SD_SHORTED_CHANNEL(2, 0, AD7791_CH_AIN1N_AIN1N, \
+	AD7991_CHANNEL(1, 1, AD7791_CH_AIN2, (bits), (storagebits), 0), \
+	AD7991_SHORTED_CHANNEL(2, 0, AD7791_CH_AIN1N_AIN1N, \
 		(bits), (storagebits), 0), \
-	AD_SD_SUPPLY_CHANNEL(3, 2, AD7791_CH_AVDD_MONITOR,  \
+	AD7991_SUPPLY_CHANNEL(3, 2, AD7791_CH_AVDD_MONITOR,  \
 		(bits), (storagebits), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(4), \
 }
 
 #define DECLARE_AD7791_CHANNELS(name, bits, storagebits) \
 const struct iio_chan_spec name[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
+	AD7991_DIFF_CHANNEL(0, 0, 0, AD7791_CH_AIN1P_AIN1N, \
 		(bits), (storagebits), 0), \
-	AD_SD_SHORTED_CHANNEL(1, 0, AD7791_CH_AIN1N_AIN1N, \
+	AD7991_SHORTED_CHANNEL(1, 0, AD7791_CH_AIN1N_AIN1N, \
 		(bits), (storagebits), 0), \
-	AD_SD_SUPPLY_CHANNEL(2, 1, AD7791_CH_AVDD_MONITOR, \
+	AD7991_SUPPLY_CHANNEL(2, 1, AD7791_CH_AVDD_MONITOR, \
 		(bits), (storagebits), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(3), \
 }
-- 
2.20.1

[PATCH 3/5] iio: adc: ad7793: define/use own IIO channel macros

[Alexandru Ardelean]

This driver seems to use most of the AD_SD_*_CHANNEL. This change will move
them in the driver. The intent is that if a new part comes along which
would require tweaks per IIO channel, these should be doable in the driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/ad7793.c | 95 ++++++++++++++++++++++++++++++----------
 1 file changed, 71 insertions(+), 24 deletions(-)

diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index b747db97f78a..5592ae573e6b 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -546,47 +546,94 @@ static const struct iio_info ad7797_info = {
 	.validate_trigger = ad_sd_validate_trigger,
 };
 
+#define __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+	_storagebits, _shift, _extend_name, _type, _mask_all) \
+	{ \
+		.type = (_type), \
+		.differential = (_channel2 == -1 ? 0 : 1), \
+		.indexed = 1, \
+		.channel = (_channel1), \
+		.channel2 = (_channel2), \
+		.address = (_address), \
+		.extend_name = (_extend_name), \
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			BIT(IIO_CHAN_INFO_OFFSET), \
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+		.info_mask_shared_by_all = _mask_all, \
+		.scan_index = (_si), \
+		.scan_type = { \
+			.sign = 'u', \
+			.realbits = (_bits), \
+			.storagebits = (_storagebits), \
+			.shift = (_shift), \
+			.endianness = IIO_BE, \
+		}, \
+	}
+
+#define AD7793_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+		_storagebits, _shift, NULL, IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7793_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \
+		_storagebits, _shift, "shorted", IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7793_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \
+	__AD7793_CHANNEL(_si, 0, -1, _address, _bits, \
+		_storagebits, _shift, NULL, IIO_TEMP, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7793_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \
+	_shift) \
+	__AD7793_CHANNEL(_si, _channel, -1, _address, _bits, \
+		_storagebits, _shift, "supply", IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
 #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \
 const struct iio_chan_spec _name##_channels[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \
-	AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \
-	AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \
-	AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \
-	AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \
-	AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \
+	AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \
+	AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \
+	AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \
+	AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \
+	AD7793_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \
+	AD7793_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \
 	IIO_CHAN_SOFT_TIMESTAMP(6), \
 }
 
 #define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \
 const struct iio_chan_spec _name##_channels[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \
-	AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
-	AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \
-	AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \
+	AD7793_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+	AD7793_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \
+	AD7793_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(9), \
 }
 
 #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \
 const struct iio_chan_spec _name##_channels[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
-	AD_SD_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
-	AD_SD_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \
-	AD_SD_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+	AD7793_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+	AD7793_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \
+	AD7793_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(4), \
 }
 
 #define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \
 const struct iio_chan_spec _name##_channels[] = { \
-	AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
-	AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
-	AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
-	AD_SD_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
+	AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
+	AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+	AD7793_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(5), \
 }
 
-- 
2.20.1

[PATCH 4/5] iio: ad_sigma_delta: remove unused IIO channel macros

[Alexandru Ardelean]

Now that all channel SigmaDelta IIO channel macros have been localized,
remove the generic ones.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 include/linux/iio/adc/ad_sigma_delta.h | 58 --------------------------
 1 file changed, 58 deletions(-)

diff --git a/include/linux/iio/adc/ad_sigma_delta.h b/include/linux/iio/adc/ad_sigma_delta.h
index 5a127c0ed200..a3a838dcf8e4 100644
--- a/include/linux/iio/adc/ad_sigma_delta.h
+++ b/include/linux/iio/adc/ad_sigma_delta.h
@@ -133,62 +133,4 @@ void ad_sd_cleanup_buffer_and_trigger(struct iio_dev *indio_dev);
 
 int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig);
 
-#define __AD_SD_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
-	_storagebits, _shift, _extend_name, _type, _mask_all) \
-	{ \
-		.type = (_type), \
-		.differential = (_channel2 == -1 ? 0 : 1), \
-		.indexed = 1, \
-		.channel = (_channel1), \
-		.channel2 = (_channel2), \
-		.address = (_address), \
-		.extend_name = (_extend_name), \
-		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
-			BIT(IIO_CHAN_INFO_OFFSET), \
-		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
-		.info_mask_shared_by_all = _mask_all, \
-		.scan_index = (_si), \
-		.scan_type = { \
-			.sign = 'u', \
-			.realbits = (_bits), \
-			.storagebits = (_storagebits), \
-			.shift = (_shift), \
-			.endianness = IIO_BE, \
-		}, \
-	}
-
-#define AD_SD_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
-	_storagebits, _shift) \
-	__AD_SD_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
-		_storagebits, _shift, NULL, IIO_VOLTAGE, \
-		BIT(IIO_CHAN_INFO_SAMP_FREQ))
-
-#define AD_SD_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
-	_storagebits, _shift) \
-	__AD_SD_CHANNEL(_si, _channel, _channel, _address, _bits, \
-		_storagebits, _shift, "shorted", IIO_VOLTAGE, \
-		BIT(IIO_CHAN_INFO_SAMP_FREQ))
-
-#define AD_SD_CHANNEL(_si, _channel, _address, _bits, \
-	_storagebits, _shift) \
-	__AD_SD_CHANNEL(_si, _channel, -1, _address, _bits, \
-		_storagebits, _shift, NULL, IIO_VOLTAGE, \
-		 BIT(IIO_CHAN_INFO_SAMP_FREQ))
-
-#define AD_SD_CHANNEL_NO_SAMP_FREQ(_si, _channel, _address, _bits, \
-	_storagebits, _shift) \
-	__AD_SD_CHANNEL(_si, _channel, -1, _address, _bits, \
-		_storagebits, _shift, NULL, IIO_VOLTAGE, 0)
-
-#define AD_SD_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \
-	__AD_SD_CHANNEL(_si, 0, -1, _address, _bits, \
-		_storagebits, _shift, NULL, IIO_TEMP, \
-		BIT(IIO_CHAN_INFO_SAMP_FREQ))
-
-#define AD_SD_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \
-	_shift) \
-	__AD_SD_CHANNEL(_si, _channel, -1, _address, _bits, \
-		_storagebits, _shift, "supply", IIO_VOLTAGE, \
-		BIT(IIO_CHAN_INFO_SAMP_FREQ))
-
 #endif
-- 
2.20.1

[PATCH 5/5] iio: adc: ad7793: use read_avail iio hook for scale available

[Alexandru Ardelean]

This change uses the read_avail and '.info_mask_shared_by_type_available'
modifier to set the available scale.
Essentially, nothing changes to the driver's ABI.

The main idea for this patch is to remove the AD7793 driver from
checkpatch's radar. There have been about ~3 attempts to fix/break the
'in_voltage-voltage_scale_available' attribute, because checkpatch assumed
it to be an arithmetic operation and people were trying to change that.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/ad7793.c | 53 +++++++++++++++++++++++++++-------------
 1 file changed, 36 insertions(+), 17 deletions(-)

diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index 5592ae573e6b..fad98f1801db 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -354,29 +354,28 @@ static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
 static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797,
 	sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4");
 
-static ssize_t ad7793_show_scale_available(struct device *dev,
-			struct device_attribute *attr, char *buf)
+static int ad7793_read_avail(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     const int **vals, int *type, int *length,
+			     long mask)
 {
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7793_state *st = iio_priv(indio_dev);
-	int i, len = 0;
 
-	for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
-		len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
-			       st->scale_avail[i][1]);
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		*vals = (int *)st->scale_avail;
+		*type = IIO_VAL_INT_PLUS_NANO;
+		/* Values are stored in a 2D matrix  */
+		*length = ARRAY_SIZE(st->scale_avail) * 2;
 
-	len += sprintf(buf + len, "\n");
+		return IIO_AVAIL_LIST;
+	}
 
-	return len;
+	return -EINVAL;
 }
 
-static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available,
-		in_voltage-voltage_scale_available, S_IRUGO,
-		ad7793_show_scale_available, NULL, 0);
-
 static struct attribute *ad7793_attributes[] = {
 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
-	&iio_dev_attr_in_m_in_scale_available.dev_attr.attr,
 	NULL
 };
 
@@ -534,6 +533,7 @@ static const struct iio_info ad7793_info = {
 	.read_raw = &ad7793_read_raw,
 	.write_raw = &ad7793_write_raw,
 	.write_raw_get_fmt = &ad7793_write_raw_get_fmt,
+	.read_avail = ad7793_read_avail,
 	.attrs = &ad7793_attribute_group,
 	.validate_trigger = ad_sd_validate_trigger,
 };
@@ -547,7 +547,7 @@ static const struct iio_info ad7797_info = {
 };
 
 #define __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
-	_storagebits, _shift, _extend_name, _type, _mask_all) \
+	_storagebits, _shift, _extend_name, _type, _mask_type_av, _mask_all) \
 	{ \
 		.type = (_type), \
 		.differential = (_channel2 == -1 ? 0 : 1), \
@@ -559,6 +559,7 @@ static const struct iio_info ad7797_info = {
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 			BIT(IIO_CHAN_INFO_OFFSET), \
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+		.info_mask_shared_by_type_available = (_mask_type_av), \
 		.info_mask_shared_by_all = _mask_all, \
 		.scan_index = (_si), \
 		.scan_type = { \
@@ -574,23 +575,41 @@ static const struct iio_info ad7797_info = {
 	_storagebits, _shift) \
 	__AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
 		_storagebits, _shift, NULL, IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SCALE), \
 		BIT(IIO_CHAN_INFO_SAMP_FREQ))
 
 #define AD7793_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
 	_storagebits, _shift) \
 	__AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \
 		_storagebits, _shift, "shorted", IIO_VOLTAGE, \
+		BIT(IIO_CHAN_INFO_SCALE), \
 		BIT(IIO_CHAN_INFO_SAMP_FREQ))
 
 #define AD7793_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \
 	__AD7793_CHANNEL(_si, 0, -1, _address, _bits, \
 		_storagebits, _shift, NULL, IIO_TEMP, \
+		0, \
 		BIT(IIO_CHAN_INFO_SAMP_FREQ))
 
 #define AD7793_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \
 	_shift) \
 	__AD7793_CHANNEL(_si, _channel, -1, _address, _bits, \
 		_storagebits, _shift, "supply", IIO_VOLTAGE, \
+		0, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7797_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \
+		_storagebits, _shift, NULL, IIO_VOLTAGE, \
+		0, \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ))
+
+#define AD7797_SHORTED_CHANNEL(_si, _channel, _address, _bits, \
+	_storagebits, _shift) \
+	__AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \
+		_storagebits, _shift, "shorted", IIO_VOLTAGE, \
+		0, \
 		BIT(IIO_CHAN_INFO_SAMP_FREQ))
 
 #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \
@@ -620,8 +639,8 @@ const struct iio_chan_spec _name##_channels[] = { \
 
 #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \
 const struct iio_chan_spec _name##_channels[] = { \
-	AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
-	AD7793_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
+	AD7797_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
+	AD7797_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
 	AD7793_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \
 	AD7793_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
 	IIO_CHAN_SOFT_TIMESTAMP(4), \
-- 
2.20.1

Re: [PATCH 5/5] iio: adc: ad7793: use read_avail iio hook for scale available

[Lars-Peter Clausen]

On 3/18/20 2:40 PM, Alexandru Ardelean wrote:
> This change uses the read_avail and '.info_mask_shared_by_type_available'
> modifier to set the available scale.
> Essentially, nothing changes to the driver's ABI.
> 
> The main idea for this patch is to remove the AD7793 driver from
> checkpatch's radar. There have been about ~3 attempts to fix/break the
> 'in_voltage-voltage_scale_available' attribute, because checkpatch assumed
> it to be an arithmetic operation and people were trying to change that.


Yeah, probably a good idea!

> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>   drivers/iio/adc/ad7793.c | 53 +++++++++++++++++++++++++++-------------
>   1 file changed, 36 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> index 5592ae573e6b..fad98f1801db 100644
> --- a/drivers/iio/adc/ad7793.c
> +++ b/drivers/iio/adc/ad7793.c
> @@ -354,29 +354,28 @@ static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
>   static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797,
>   	sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4");
>   
> -static ssize_t ad7793_show_scale_available(struct device *dev,
> -			struct device_attribute *attr, char *buf)
> +static int ad7793_read_avail(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     const int **vals, int *type, int *length,
> +			     long mask)
>   {
> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>   	struct ad7793_state *st = iio_priv(indio_dev);
> -	int i, len = 0;
>   
> -	for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
> -		len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
> -			       st->scale_avail[i][1]);
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		*vals = (int *)st->scale_avail;

Can you change the type of scale_avail to int so we don't need the cast?

> +		*type = IIO_VAL_INT_PLUS_NANO;
> +		/* Values are stored in a 2D matrix  */
> +		*length = ARRAY_SIZE(st->scale_avail) * 2;
>   
> -	len += sprintf(buf + len, "\n");
> +		return IIO_AVAIL_LIST;
> +	}
>   
> -	return len;
> +	return -EINVAL;
>   }

Re: [PATCH 5/5] iio: adc: ad7793: use read_avail iio hook for scale available

[Ardelean, Alexandru]

On Wed, 2020-03-18 at 16:10 +0100, Lars-Peter Clausen wrote:
> On 3/18/20 2:40 PM, Alexandru Ardelean wrote:
> > This change uses the read_avail and '.info_mask_shared_by_type_available'
> > modifier to set the available scale.
> > Essentially, nothing changes to the driver's ABI.
> > 
> > The main idea for this patch is to remove the AD7793 driver from
> > checkpatch's radar. There have been about ~3 attempts to fix/break the
> > 'in_voltage-voltage_scale_available' attribute, because checkpatch assumed
> > it to be an arithmetic operation and people were trying to change that.
> 
> Yeah, probably a good idea!
> 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> > ---
> >   drivers/iio/adc/ad7793.c | 53 +++++++++++++++++++++++++++-------------
> >   1 file changed, 36 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> > index 5592ae573e6b..fad98f1801db 100644
> > --- a/drivers/iio/adc/ad7793.c
> > +++ b/drivers/iio/adc/ad7793.c
> > @@ -354,29 +354,28 @@ static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
> >   static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797,
> >   	sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4");
> >   
> > -static ssize_t ad7793_show_scale_available(struct device *dev,
> > -			struct device_attribute *attr, char *buf)
> > +static int ad7793_read_avail(struct iio_dev *indio_dev,
> > +			     struct iio_chan_spec const *chan,
> > +			     const int **vals, int *type, int *length,
> > +			     long mask)
> >   {
> > -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> >   	struct ad7793_state *st = iio_priv(indio_dev);
> > -	int i, len = 0;
> >   
> > -	for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
> > -		len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
> > -			       st->scale_avail[i][1]);
> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_SCALE:
> > +		*vals = (int *)st->scale_avail;
> 
> Can you change the type of scale_avail to int so we don't need the cast?
> 

So, I don't want to come-up as looking lazy.
[I mean, I am lazy, but I don't want to look lazy.]

I took a look at what it means to change this to a simple array.
The rework feels to me like a bit more noise than is probably worth it.
I mean, if the purpose of the rework is to just get rid of this cast, then it
feels noisy [to me].

That being said, if you insist, I can take a look and do a patch [before this
one] to convert it to a simple array.


> > +		*type = IIO_VAL_INT_PLUS_NANO;
> > +		/* Values are stored in a 2D matrix  */
> > +		*length = ARRAY_SIZE(st->scale_avail) * 2;
> >   
> > -	len += sprintf(buf + len, "\n");
> > +		return IIO_AVAIL_LIST;
> > +	}
> >   
> > -	return len;
> > +	return -EINVAL;
> >   }

Re: [PATCH 5/5] iio: adc: ad7793: use read_avail iio hook for scale available

[Lars-Peter Clausen]

On 3/19/20 8:58 AM, Ardelean, Alexandru wrote:
> On Wed, 2020-03-18 at 16:10 +0100, Lars-Peter Clausen wrote:
>> On 3/18/20 2:40 PM, Alexandru Ardelean wrote:
>>> This change uses the read_avail and '.info_mask_shared_by_type_available'
>>> modifier to set the available scale.
>>> Essentially, nothing changes to the driver's ABI.
>>>
>>> The main idea for this patch is to remove the AD7793 driver from
>>> checkpatch's radar. There have been about ~3 attempts to fix/break the
>>> 'in_voltage-voltage_scale_available' attribute, because checkpatch assumed
>>> it to be an arithmetic operation and people were trying to change that.
>>
>> Yeah, probably a good idea!
>>
>>> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
>>> ---
>>>    drivers/iio/adc/ad7793.c | 53 +++++++++++++++++++++++++++-------------
>>>    1 file changed, 36 insertions(+), 17 deletions(-)
>>>
>>> diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
>>> index 5592ae573e6b..fad98f1801db 100644
>>> --- a/drivers/iio/adc/ad7793.c
>>> +++ b/drivers/iio/adc/ad7793.c
>>> @@ -354,29 +354,28 @@ static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
>>>    static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797,
>>>    	sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4");
>>>    
>>> -static ssize_t ad7793_show_scale_available(struct device *dev,
>>> -			struct device_attribute *attr, char *buf)
>>> +static int ad7793_read_avail(struct iio_dev *indio_dev,
>>> +			     struct iio_chan_spec const *chan,
>>> +			     const int **vals, int *type, int *length,
>>> +			     long mask)
>>>    {
>>> -	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>>>    	struct ad7793_state *st = iio_priv(indio_dev);
>>> -	int i, len = 0;
>>>    
>>> -	for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
>>> -		len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
>>> -			       st->scale_avail[i][1]);
>>> +	switch (mask) {
>>> +	case IIO_CHAN_INFO_SCALE:
>>> +		*vals = (int *)st->scale_avail;
>>
>> Can you change the type of scale_avail to int so we don't need the cast?
>>
> 
> So, I don't want to come-up as looking lazy.
> [I mean, I am lazy, but I don't want to look lazy.]
> 
> I took a look at what it means to change this to a simple array.
> The rework feels to me like a bit more noise than is probably worth it.
> I mean, if the purpose of the rework is to just get rid of this cast, then it
> feels noisy [to me].
> 
> That being said, if you insist, I can take a look and do a patch [before this
> one] to convert it to a simple array.

Hm, ok, looks like is more complicated to get rid of the cast than I 
though. So keep it.