[PATCH v2 1/3] iio: adc: ina2xx: Make use of attribute flags consistent on all channels

[PATCH v2 1/3] iio: adc: ina2xx: Make use of attribute flags consistent on all channels

[Stefan Brüns]

Flags for shared channel attributes should be set on all channels of a
channel set. I.e. SAMP_FREQUENCY and OVERSAMPLING_RATIO are set on the
in_voltage{0,1} channels, thus should be set on in_power, in_current.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---
 drivers/iio/adc/ina2xx-adc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 6b588ac3130c..bba10a1b2fcb 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -442,6 +442,8 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 			      BIT(IIO_CHAN_INFO_SCALE) | \
 			      BIT(IIO_CHAN_INFO_INT_TIME), \
+	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+				   BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
 	.scan_index = (_index), \
 	.scan_type = { \
 		.sign = 'u', \
-- 
2.12.2

Re: [PATCH v2 1/3] iio: adc: ina2xx: Make use of attribute flags consistent on all channels

[Jonathan Cameron]

On Wed, 24 May 2017 02:09:05 +0200
Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:

> Flags for shared channel attributes should be set on all channels of a
> channel set. I.e. SAMP_FREQUENCY and OVERSAMPLING_RATIO are set on the
> in_voltage{0,1} channels, thus should be set on in_power, in_current.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Applied to the togreg branch of iio.git.

Thanks for tidying this up.

Jonathan
> ---
>  drivers/iio/adc/ina2xx-adc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> index 6b588ac3130c..bba10a1b2fcb 100644
> --- a/drivers/iio/adc/ina2xx-adc.c
> +++ b/drivers/iio/adc/ina2xx-adc.c
> @@ -442,6 +442,8 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
>  	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
>  			      BIT(IIO_CHAN_INFO_SCALE) | \
>  			      BIT(IIO_CHAN_INFO_INT_TIME), \
> +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> +				   BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
>  	.scan_index = (_index), \
>  	.scan_type = { \
>  		.sign = 'u', \

[PATCH v2 2/3] iio: adc: Fix integration time/averaging for INA219/220

[Stefan Brüns]

INA226/230/231 has integration times per voltage channel and common
averaging setting for both channels, while the INA219/220 only has a
combined integration time/averaging setting per channel.
Only expose the averaging attribute for the INA226, and expose the correct
integration times for the INA219.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---
 drivers/iio/adc/ina2xx-adc.c | 204 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 182 insertions(+), 22 deletions(-)

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index bba10a1b2fcb..232c0b80d658 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -49,6 +49,7 @@
 
 /* settings - depend on use case */
 #define INA219_CONFIG_DEFAULT           0x399F	/* PGA=8 */
+#define INA219_DEFAULT_IT		532
 #define INA226_CONFIG_DEFAULT           0x4327
 #define INA226_DEFAULT_AVG              4
 #define INA226_DEFAULT_IT		1110
@@ -56,19 +57,24 @@
 #define INA2XX_RSHUNT_DEFAULT           10000
 
 /*
- * bit mask for reading the averaging setting in the configuration register
+ * bit masks for reading the settings in the configuration register
  * FIXME: use regmap_fields.
  */
 #define INA2XX_MODE_MASK	GENMASK(3, 0)
 
+/* Averaging for VBus/VShunt/Power */
 #define INA226_AVG_MASK		GENMASK(11, 9)
 #define INA226_SHIFT_AVG(val)	((val) << 9)
 
 /* Integration time for VBus */
+#define INA219_ITB_MASK		GENMASK(10, 7)
+#define INA219_SHIFT_ITB(val)	((val) << 7)
 #define INA226_ITB_MASK		GENMASK(8, 6)
 #define INA226_SHIFT_ITB(val)	((val) << 6)
 
 /* Integration time for VShunt */
+#define INA219_ITS_MASK		GENMASK(6, 3)
+#define INA219_SHIFT_ITS(val)	((val) << 3)
 #define INA226_ITS_MASK		GENMASK(5, 3)
 #define INA226_SHIFT_ITS(val)	((val) << 3)
 
@@ -108,6 +114,7 @@ struct ina2xx_config {
 	int bus_voltage_shift;
 	int bus_voltage_lsb;	/* uV */
 	int power_lsb;		/* uW */
+	enum ina2xx_ids chip_id;
 };
 
 struct ina2xx_chip_info {
@@ -130,6 +137,7 @@ static const struct ina2xx_config ina2xx_config[] = {
 		.bus_voltage_shift = 3,
 		.bus_voltage_lsb = 4000,
 		.power_lsb = 20000,
+		.chip_id = ina219,
 	},
 	[ina226] = {
 		.config_default = INA226_CONFIG_DEFAULT,
@@ -138,6 +146,7 @@ static const struct ina2xx_config ina2xx_config[] = {
 		.bus_voltage_shift = 0,
 		.bus_voltage_lsb = 1250,
 		.power_lsb = 25000,
+		.chip_id = ina226,
 	},
 };
 
@@ -283,6 +292,66 @@ static int ina226_set_int_time_vshunt(struct ina2xx_chip_info *chip,
 	return 0;
 }
 
+/* Conversion times in uS. */
+static const int ina219_conv_time_tab_subsample[] = { 84, 148, 276, 532 };
+static const int ina219_conv_time_tab_average[] = { 532, 1060, 2130, 4260,
+						    8510, 17020, 34050, 68100};
+
+static int ina219_lookup_int_time(unsigned int *val_us, int *bits)
+{
+	if (*val_us > 68100 || *val_us < 84)
+		return -EINVAL;
+
+	if (*val_us <= 532) {
+		*bits = find_closest(*val_us, ina219_conv_time_tab_subsample,
+				    ARRAY_SIZE(ina219_conv_time_tab_subsample));
+		*val_us = ina219_conv_time_tab_subsample[*bits];
+	} else {
+		*bits = find_closest(*val_us, ina219_conv_time_tab_average,
+				    ARRAY_SIZE(ina219_conv_time_tab_average));
+		*val_us = ina219_conv_time_tab_average[*bits];
+		*bits |= 0x8;
+	}
+
+	return 0;
+}
+
+static int ina219_set_int_time_vbus(struct ina2xx_chip_info *chip,
+				    unsigned int val_us, unsigned int *config)
+{
+	int bits, ret;
+	unsigned int val_us_best = val_us;
+
+	ret = ina219_lookup_int_time(&val_us_best, &bits);
+	if (ret)
+		return ret;
+
+	chip->int_time_vbus = val_us_best;
+
+	*config &= ~INA219_ITB_MASK;
+	*config |= INA219_SHIFT_ITB(bits) & INA219_ITB_MASK;
+
+	return 0;
+}
+
+static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip,
+				      unsigned int val_us, unsigned int *config)
+{
+	int bits, ret;
+	unsigned int val_us_best = val_us;
+
+	ret = ina219_lookup_int_time(&val_us_best, &bits);
+	if (ret)
+		return ret;
+
+	chip->int_time_vshunt = val_us_best;
+
+	*config &= ~INA219_ITS_MASK;
+	*config |= INA219_SHIFT_ITS(bits) & INA219_ITS_MASK;
+
+	return 0;
+}
+
 static int ina2xx_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int val, int val2, long mask)
@@ -308,10 +377,21 @@ static int ina2xx_write_raw(struct iio_dev *indio_dev,
 		break;
 
 	case IIO_CHAN_INFO_INT_TIME:
-		if (chan->address == INA2XX_SHUNT_VOLTAGE)
-			ret = ina226_set_int_time_vshunt(chip, val2, &tmp);
-		else
-			ret = ina226_set_int_time_vbus(chip, val2, &tmp);
+		if (chip->config->chip_id == ina226) {
+			if (chan->address == INA2XX_SHUNT_VOLTAGE)
+				ret = ina226_set_int_time_vshunt(chip, val2,
+								 &tmp);
+			else
+				ret = ina226_set_int_time_vbus(chip, val2,
+							       &tmp);
+		} else {
+			if (chan->address == INA2XX_SHUNT_VOLTAGE)
+				ret = ina219_set_int_time_vshunt(chip, val2,
+								 &tmp);
+			else
+				ret = ina219_set_int_time_vbus(chip, val2,
+							       &tmp);
+		}
 		break;
 
 	default:
@@ -412,7 +492,24 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
 	return len;
 }
 
-#define INA2XX_CHAN(_type, _index, _address) { \
+#define INA219_CHAN(_type, _index, _address) { \
+	.type = (_type), \
+	.address = (_address), \
+	.indexed = 1, \
+	.channel = (_index), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			      BIT(IIO_CHAN_INFO_SCALE), \
+	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+	.scan_index = (_index), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 16, \
+		.storagebits = 16, \
+		.endianness = IIO_CPU, \
+	} \
+}
+
+#define INA226_CHAN(_type, _index, _address) { \
 	.type = (_type), \
 	.address = (_address), \
 	.indexed = 1, \
@@ -434,7 +531,25 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
  * Sampling Freq is a consequence of the integration times of
  * the Voltage channels.
  */
-#define INA2XX_CHAN_VOLTAGE(_index, _address) { \
+#define INA219_CHAN_VOLTAGE(_index, _address) { \
+	.type = IIO_VOLTAGE, \
+	.address = (_address), \
+	.indexed = 1, \
+	.channel = (_index), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			      BIT(IIO_CHAN_INFO_SCALE) | \
+			      BIT(IIO_CHAN_INFO_INT_TIME), \
+	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+	.scan_index = (_index), \
+	.scan_type = { \
+		.sign = 'u', \
+		.realbits = 16, \
+		.storagebits = 16, \
+		.endianness = IIO_LE, \
+	} \
+}
+
+#define INA226_CHAN_VOLTAGE(_index, _address) { \
 	.type = IIO_VOLTAGE, \
 	.address = (_address), \
 	.indexed = 1, \
@@ -453,11 +568,20 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
 	} \
 }
 
-static const struct iio_chan_spec ina2xx_channels[] = {
-	INA2XX_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
-	INA2XX_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
-	INA2XX_CHAN(IIO_POWER, 2, INA2XX_POWER),
-	INA2XX_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
+
+static const struct iio_chan_spec ina226_channels[] = {
+	INA226_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
+	INA226_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
+	INA226_CHAN(IIO_POWER, 2, INA2XX_POWER),
+	INA226_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static const struct iio_chan_spec ina219_channels[] = {
+	INA219_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
+	INA219_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
+	INA219_CHAN(IIO_POWER, 2, INA2XX_POWER),
+	INA219_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
 	IIO_CHAN_SOFT_TIMESTAMP(4),
 };
 
@@ -592,7 +716,14 @@ static int ina2xx_debug_reg(struct iio_dev *indio_dev,
 }
 
 /* Possible integration times for vshunt and vbus */
-static IIO_CONST_ATTR_INT_TIME_AVAIL("0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
+static IIO_CONST_ATTR_NAMED(ina219_integration_time_available,
+			    integration_time_available,
+			    "0.000084 0.000148 0.000276 0.000532 0.001060 0.002130 0.004260 0.008510 0.017020 0.034050 0.068100");
+
+static IIO_CONST_ATTR_NAMED(ina226_integration_time_available,
+			    integration_time_available,
+			    "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
+
 
 static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR,
 		       ina2xx_allow_async_readout_show,
@@ -602,20 +733,39 @@ static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO | S_IWUSR,
 		       ina2xx_shunt_resistor_show,
 		       ina2xx_shunt_resistor_store, 0);
 
-static struct attribute *ina2xx_attributes[] = {
+static struct attribute *ina219_attributes[] = {
+	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
+	&iio_const_attr_ina219_integration_time_available.dev_attr.attr,
+	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
+	NULL,
+};
+
+static struct attribute *ina226_attributes[] = {
 	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
-	&iio_const_attr_integration_time_available.dev_attr.attr,
+	&iio_const_attr_ina226_integration_time_available.dev_attr.attr,
 	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
 	NULL,
 };
 
-static const struct attribute_group ina2xx_attribute_group = {
-	.attrs = ina2xx_attributes,
+static const struct attribute_group ina219_attribute_group = {
+	.attrs = ina219_attributes,
 };
 
-static const struct iio_info ina2xx_info = {
+static const struct attribute_group ina226_attribute_group = {
+	.attrs = ina226_attributes,
+};
+
+static const struct iio_info ina219_info = {
+	.driver_module = THIS_MODULE,
+	.attrs = &ina219_attribute_group,
+	.read_raw = ina2xx_read_raw,
+	.write_raw = ina2xx_write_raw,
+	.debugfs_reg_access = ina2xx_debug_reg,
+};
+
+static const struct iio_info ina226_info = {
 	.driver_module = THIS_MODULE,
-	.attrs = &ina2xx_attribute_group,
+	.attrs = &ina226_attribute_group,
 	.read_raw = ina2xx_read_raw,
 	.write_raw = ina2xx_write_raw,
 	.debugfs_reg_access = ina2xx_debug_reg,
@@ -686,6 +836,10 @@ static int ina2xx_probe(struct i2c_client *client,
 		ina226_set_average(chip, INA226_DEFAULT_AVG, &val);
 		ina226_set_int_time_vbus(chip, INA226_DEFAULT_IT, &val);
 		ina226_set_int_time_vshunt(chip, INA226_DEFAULT_IT, &val);
+	} else {
+		chip->avg = 1;
+		ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val);
+		ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val);
 	}
 
 	ret = ina2xx_init(chip, val);
@@ -697,10 +851,16 @@ static int ina2xx_probe(struct i2c_client *client,
 	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->dev.of_node = client->dev.of_node;
-	indio_dev->channels = ina2xx_channels;
-	indio_dev->num_channels = ARRAY_SIZE(ina2xx_channels);
+	if (id->driver_data == ina226) {
+		indio_dev->channels = ina226_channels;
+		indio_dev->num_channels = ARRAY_SIZE(ina226_channels);
+		indio_dev->info = &ina226_info;
+	} else {
+		indio_dev->channels = ina219_channels;
+		indio_dev->num_channels = ARRAY_SIZE(ina219_channels);
+		indio_dev->info = &ina219_info;
+	}
 	indio_dev->name = id->name;
-	indio_dev->info = &ina2xx_info;
 	indio_dev->setup_ops = &ina2xx_setup_ops;
 
 	buffer = devm_iio_kfifo_allocate(&indio_dev->dev);
-- 
2.12.2

Re: [PATCH v2 2/3] iio: adc: Fix integration time/averaging for INA219/220

[Jonathan Cameron]

On Wed, 24 May 2017 02:09:06 +0200
Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:

> INA226/230/231 has integration times per voltage channel and common
> averaging setting for both channels, while the INA219/220 only has a
> combined integration time/averaging setting per channel.
> Only expose the averaging attribute for the INA226, and expose the correct
> integration times for the INA219.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
One comment inline, but not really anything I want you to change.

I would like some input from Marc or perhaps Andrew on this though.
> ---
>  drivers/iio/adc/ina2xx-adc.c | 204 ++++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 182 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> index bba10a1b2fcb..232c0b80d658 100644
> --- a/drivers/iio/adc/ina2xx-adc.c
> +++ b/drivers/iio/adc/ina2xx-adc.c
> @@ -49,6 +49,7 @@
>  
>  /* settings - depend on use case */
>  #define INA219_CONFIG_DEFAULT           0x399F	/* PGA=8 */
> +#define INA219_DEFAULT_IT		532
>  #define INA226_CONFIG_DEFAULT           0x4327
>  #define INA226_DEFAULT_AVG              4
>  #define INA226_DEFAULT_IT		1110
> @@ -56,19 +57,24 @@
>  #define INA2XX_RSHUNT_DEFAULT           10000
>  
>  /*
> - * bit mask for reading the averaging setting in the configuration register
> + * bit masks for reading the settings in the configuration register
>   * FIXME: use regmap_fields.
>   */
>  #define INA2XX_MODE_MASK	GENMASK(3, 0)
>  
> +/* Averaging for VBus/VShunt/Power */
>  #define INA226_AVG_MASK		GENMASK(11, 9)
>  #define INA226_SHIFT_AVG(val)	((val) << 9)
>  
>  /* Integration time for VBus */
> +#define INA219_ITB_MASK		GENMASK(10, 7)
> +#define INA219_SHIFT_ITB(val)	((val) << 7)
>  #define INA226_ITB_MASK		GENMASK(8, 6)
>  #define INA226_SHIFT_ITB(val)	((val) << 6)
>  
>  /* Integration time for VShunt */
> +#define INA219_ITS_MASK		GENMASK(6, 3)
> +#define INA219_SHIFT_ITS(val)	((val) << 3)
>  #define INA226_ITS_MASK		GENMASK(5, 3)
>  #define INA226_SHIFT_ITS(val)	((val) << 3)
>  
> @@ -108,6 +114,7 @@ struct ina2xx_config {
>  	int bus_voltage_shift;
>  	int bus_voltage_lsb;	/* uV */
>  	int power_lsb;		/* uW */
> +	enum ina2xx_ids chip_id;
I wonder if it would be cleaner to have someting more
specific than simply an ID?  Chances are as more parts
get added we'll get a steadily growing list of quirks
on different sets of them.

Mind you can always make that sort of generalization if /
when it is needed ;)
>  };
>  
>  struct ina2xx_chip_info {
> @@ -130,6 +137,7 @@ static const struct ina2xx_config ina2xx_config[] = {
>  		.bus_voltage_shift = 3,
>  		.bus_voltage_lsb = 4000,
>  		.power_lsb = 20000,
> +		.chip_id = ina219,
>  	},
>  	[ina226] = {
>  		.config_default = INA226_CONFIG_DEFAULT,
> @@ -138,6 +146,7 @@ static const struct ina2xx_config ina2xx_config[] = {
>  		.bus_voltage_shift = 0,
>  		.bus_voltage_lsb = 1250,
>  		.power_lsb = 25000,
> +		.chip_id = ina226,
>  	},
>  };
>  
> @@ -283,6 +292,66 @@ static int ina226_set_int_time_vshunt(struct ina2xx_chip_info *chip,
>  	return 0;
>  }
>  
> +/* Conversion times in uS. */
> +static const int ina219_conv_time_tab_subsample[] = { 84, 148, 276, 532 };
> +static const int ina219_conv_time_tab_average[] = { 532, 1060, 2130, 4260,
> +						    8510, 17020, 34050, 68100};
> +
> +static int ina219_lookup_int_time(unsigned int *val_us, int *bits)
> +{
> +	if (*val_us > 68100 || *val_us < 84)
> +		return -EINVAL;
> +
> +	if (*val_us <= 532) {
> +		*bits = find_closest(*val_us, ina219_conv_time_tab_subsample,
> +				    ARRAY_SIZE(ina219_conv_time_tab_subsample));
> +		*val_us = ina219_conv_time_tab_subsample[*bits];
> +	} else {
> +		*bits = find_closest(*val_us, ina219_conv_time_tab_average,
> +				    ARRAY_SIZE(ina219_conv_time_tab_average));
> +		*val_us = ina219_conv_time_tab_average[*bits];
> +		*bits |= 0x8;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ina219_set_int_time_vbus(struct ina2xx_chip_info *chip,
> +				    unsigned int val_us, unsigned int *config)
> +{
> +	int bits, ret;
> +	unsigned int val_us_best = val_us;
> +
> +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> +	if (ret)
> +		return ret;
> +
> +	chip->int_time_vbus = val_us_best;
> +
> +	*config &= ~INA219_ITB_MASK;
> +	*config |= INA219_SHIFT_ITB(bits) & INA219_ITB_MASK;
> +
> +	return 0;
> +}
> +
> +static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip,
> +				      unsigned int val_us, unsigned int *config)
> +{
> +	int bits, ret;
> +	unsigned int val_us_best = val_us;
> +
> +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> +	if (ret)
> +		return ret;
> +
> +	chip->int_time_vshunt = val_us_best;
> +
> +	*config &= ~INA219_ITS_MASK;
> +	*config |= INA219_SHIFT_ITS(bits) & INA219_ITS_MASK;
> +
> +	return 0;
> +}
> +
>  static int ina2xx_write_raw(struct iio_dev *indio_dev,
>  			    struct iio_chan_spec const *chan,
>  			    int val, int val2, long mask)
> @@ -308,10 +377,21 @@ static int ina2xx_write_raw(struct iio_dev *indio_dev,
>  		break;
>  
>  	case IIO_CHAN_INFO_INT_TIME:
> -		if (chan->address == INA2XX_SHUNT_VOLTAGE)
> -			ret = ina226_set_int_time_vshunt(chip, val2, &tmp);
> -		else
> -			ret = ina226_set_int_time_vbus(chip, val2, &tmp);
> +		if (chip->config->chip_id == ina226) {
> +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> +				ret = ina226_set_int_time_vshunt(chip, val2,
> +								 &tmp);
> +			else
> +				ret = ina226_set_int_time_vbus(chip, val2,
> +							       &tmp);
> +		} else {
> +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> +				ret = ina219_set_int_time_vshunt(chip, val2,
> +								 &tmp);
> +			else
> +				ret = ina219_set_int_time_vbus(chip, val2,
> +							       &tmp);
> +		}
>  		break;
>  
>  	default:
> @@ -412,7 +492,24 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
>  	return len;
>  }
>  
> -#define INA2XX_CHAN(_type, _index, _address) { \
> +#define INA219_CHAN(_type, _index, _address) { \
> +	.type = (_type), \
> +	.address = (_address), \
> +	.indexed = 1, \
> +	.channel = (_index), \
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> +			      BIT(IIO_CHAN_INFO_SCALE), \
> +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> +	.scan_index = (_index), \
> +	.scan_type = { \
> +		.sign = 'u', \
> +		.realbits = 16, \
> +		.storagebits = 16, \
> +		.endianness = IIO_CPU, \
> +	} \
> +}
> +
> +#define INA226_CHAN(_type, _index, _address) { \
>  	.type = (_type), \
>  	.address = (_address), \
>  	.indexed = 1, \
> @@ -434,7 +531,25 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
>   * Sampling Freq is a consequence of the integration times of
>   * the Voltage channels.
>   */
> -#define INA2XX_CHAN_VOLTAGE(_index, _address) { \
> +#define INA219_CHAN_VOLTAGE(_index, _address) { \
> +	.type = IIO_VOLTAGE, \
> +	.address = (_address), \
> +	.indexed = 1, \
> +	.channel = (_index), \
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> +			      BIT(IIO_CHAN_INFO_SCALE) | \
> +			      BIT(IIO_CHAN_INFO_INT_TIME), \
> +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> +	.scan_index = (_index), \
> +	.scan_type = { \
> +		.sign = 'u', \
> +		.realbits = 16, \
> +		.storagebits = 16, \
> +		.endianness = IIO_LE, \
> +	} \
> +}
> +
> +#define INA226_CHAN_VOLTAGE(_index, _address) { \
>  	.type = IIO_VOLTAGE, \
>  	.address = (_address), \
>  	.indexed = 1, \
> @@ -453,11 +568,20 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
>  	} \
>  }
>  
> -static const struct iio_chan_spec ina2xx_channels[] = {
> -	INA2XX_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> -	INA2XX_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> -	INA2XX_CHAN(IIO_POWER, 2, INA2XX_POWER),
> -	INA2XX_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> +
> +static const struct iio_chan_spec ina226_channels[] = {
> +	INA226_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> +	INA226_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> +	INA226_CHAN(IIO_POWER, 2, INA2XX_POWER),
> +	INA226_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> +	IIO_CHAN_SOFT_TIMESTAMP(4),
> +};
> +
> +static const struct iio_chan_spec ina219_channels[] = {
> +	INA219_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> +	INA219_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> +	INA219_CHAN(IIO_POWER, 2, INA2XX_POWER),
> +	INA219_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
>  	IIO_CHAN_SOFT_TIMESTAMP(4),
>  };
>  
> @@ -592,7 +716,14 @@ static int ina2xx_debug_reg(struct iio_dev *indio_dev,
>  }
>  
>  /* Possible integration times for vshunt and vbus */
> -static IIO_CONST_ATTR_INT_TIME_AVAIL("0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> +static IIO_CONST_ATTR_NAMED(ina219_integration_time_available,
> +			    integration_time_available,
> +			    "0.000084 0.000148 0.000276 0.000532 0.001060 0.002130 0.004260 0.008510 0.017020 0.034050 0.068100");
> +
> +static IIO_CONST_ATTR_NAMED(ina226_integration_time_available,
> +			    integration_time_available,
> +			    "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> +
>  
>  static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR,
>  		       ina2xx_allow_async_readout_show,
> @@ -602,20 +733,39 @@ static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO | S_IWUSR,
>  		       ina2xx_shunt_resistor_show,
>  		       ina2xx_shunt_resistor_store, 0);
>  
> -static struct attribute *ina2xx_attributes[] = {
> +static struct attribute *ina219_attributes[] = {
> +	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> +	&iio_const_attr_ina219_integration_time_available.dev_attr.attr,
> +	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
> +	NULL,
> +};
> +
> +static struct attribute *ina226_attributes[] = {
>  	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> -	&iio_const_attr_integration_time_available.dev_attr.attr,
> +	&iio_const_attr_ina226_integration_time_available.dev_attr.attr,
>  	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
>  	NULL,
>  };
>  
> -static const struct attribute_group ina2xx_attribute_group = {
> -	.attrs = ina2xx_attributes,
> +static const struct attribute_group ina219_attribute_group = {
> +	.attrs = ina219_attributes,
>  };
>  
> -static const struct iio_info ina2xx_info = {
> +static const struct attribute_group ina226_attribute_group = {
> +	.attrs = ina226_attributes,
> +};
> +
> +static const struct iio_info ina219_info = {
> +	.driver_module = THIS_MODULE,
> +	.attrs = &ina219_attribute_group,
> +	.read_raw = ina2xx_read_raw,
> +	.write_raw = ina2xx_write_raw,
> +	.debugfs_reg_access = ina2xx_debug_reg,
> +};
> +
> +static const struct iio_info ina226_info = {
>  	.driver_module = THIS_MODULE,
> -	.attrs = &ina2xx_attribute_group,
> +	.attrs = &ina226_attribute_group,
>  	.read_raw = ina2xx_read_raw,
>  	.write_raw = ina2xx_write_raw,
>  	.debugfs_reg_access = ina2xx_debug_reg,
> @@ -686,6 +836,10 @@ static int ina2xx_probe(struct i2c_client *client,
>  		ina226_set_average(chip, INA226_DEFAULT_AVG, &val);
>  		ina226_set_int_time_vbus(chip, INA226_DEFAULT_IT, &val);
>  		ina226_set_int_time_vshunt(chip, INA226_DEFAULT_IT, &val);
> +	} else {
> +		chip->avg = 1;
> +		ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val);
> +		ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val);
>  	}
>  
>  	ret = ina2xx_init(chip, val);
> @@ -697,10 +851,16 @@ static int ina2xx_probe(struct i2c_client *client,
>  	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
>  	indio_dev->dev.parent = &client->dev;
>  	indio_dev->dev.of_node = client->dev.of_node;
> -	indio_dev->channels = ina2xx_channels;
> -	indio_dev->num_channels = ARRAY_SIZE(ina2xx_channels);
> +	if (id->driver_data == ina226) {
> +		indio_dev->channels = ina226_channels;
> +		indio_dev->num_channels = ARRAY_SIZE(ina226_channels);
> +		indio_dev->info = &ina226_info;
> +	} else {
> +		indio_dev->channels = ina219_channels;
> +		indio_dev->num_channels = ARRAY_SIZE(ina219_channels);
> +		indio_dev->info = &ina219_info;
> +	}
>  	indio_dev->name = id->name;
> -	indio_dev->info = &ina2xx_info;
>  	indio_dev->setup_ops = &ina2xx_setup_ops;
>  
>  	buffer = devm_iio_kfifo_allocate(&indio_dev->dev);

Re: [PATCH v2 2/3] iio: adc: Fix integration time/averaging for INA219/220

[Jonathan Cameron]

On Wed, 24 May 2017 20:50:45 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Wed, 24 May 2017 02:09:06 +0200
> Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:
> 
> > INA226/230/231 has integration times per voltage channel and common
> > averaging setting for both channels, while the INA219/220 only has a
> > combined integration time/averaging setting per channel.
> > Only expose the averaging attribute for the INA226, and expose the correct
> > integration times for the INA219.
> > 
> > Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>  
> One comment inline, but not really anything I want you to change.
> 
> I would like some input from Marc or perhaps Andrew on this though.

I'll give this another week I think and if we don't here anything
go with it as is.  Give me a poke if I look to have missed it though!

Jonathan
> > ---
> >  drivers/iio/adc/ina2xx-adc.c | 204 ++++++++++++++++++++++++++++++++++++++-----
> >  1 file changed, 182 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> > index bba10a1b2fcb..232c0b80d658 100644
> > --- a/drivers/iio/adc/ina2xx-adc.c
> > +++ b/drivers/iio/adc/ina2xx-adc.c
> > @@ -49,6 +49,7 @@
> >  
> >  /* settings - depend on use case */
> >  #define INA219_CONFIG_DEFAULT           0x399F	/* PGA=8 */
> > +#define INA219_DEFAULT_IT		532
> >  #define INA226_CONFIG_DEFAULT           0x4327
> >  #define INA226_DEFAULT_AVG              4
> >  #define INA226_DEFAULT_IT		1110
> > @@ -56,19 +57,24 @@
> >  #define INA2XX_RSHUNT_DEFAULT           10000
> >  
> >  /*
> > - * bit mask for reading the averaging setting in the configuration register
> > + * bit masks for reading the settings in the configuration register
> >   * FIXME: use regmap_fields.
> >   */
> >  #define INA2XX_MODE_MASK	GENMASK(3, 0)
> >  
> > +/* Averaging for VBus/VShunt/Power */
> >  #define INA226_AVG_MASK		GENMASK(11, 9)
> >  #define INA226_SHIFT_AVG(val)	((val) << 9)
> >  
> >  /* Integration time for VBus */
> > +#define INA219_ITB_MASK		GENMASK(10, 7)
> > +#define INA219_SHIFT_ITB(val)	((val) << 7)
> >  #define INA226_ITB_MASK		GENMASK(8, 6)
> >  #define INA226_SHIFT_ITB(val)	((val) << 6)
> >  
> >  /* Integration time for VShunt */
> > +#define INA219_ITS_MASK		GENMASK(6, 3)
> > +#define INA219_SHIFT_ITS(val)	((val) << 3)
> >  #define INA226_ITS_MASK		GENMASK(5, 3)
> >  #define INA226_SHIFT_ITS(val)	((val) << 3)
> >  
> > @@ -108,6 +114,7 @@ struct ina2xx_config {
> >  	int bus_voltage_shift;
> >  	int bus_voltage_lsb;	/* uV */
> >  	int power_lsb;		/* uW */
> > +	enum ina2xx_ids chip_id;  
> I wonder if it would be cleaner to have someting more
> specific than simply an ID?  Chances are as more parts
> get added we'll get a steadily growing list of quirks
> on different sets of them.
> 
> Mind you can always make that sort of generalization if /
> when it is needed ;)
> >  };
> >  
> >  struct ina2xx_chip_info {
> > @@ -130,6 +137,7 @@ static const struct ina2xx_config ina2xx_config[] = {
> >  		.bus_voltage_shift = 3,
> >  		.bus_voltage_lsb = 4000,
> >  		.power_lsb = 20000,
> > +		.chip_id = ina219,
> >  	},
> >  	[ina226] = {
> >  		.config_default = INA226_CONFIG_DEFAULT,
> > @@ -138,6 +146,7 @@ static const struct ina2xx_config ina2xx_config[] = {
> >  		.bus_voltage_shift = 0,
> >  		.bus_voltage_lsb = 1250,
> >  		.power_lsb = 25000,
> > +		.chip_id = ina226,
> >  	},
> >  };
> >  
> > @@ -283,6 +292,66 @@ static int ina226_set_int_time_vshunt(struct ina2xx_chip_info *chip,
> >  	return 0;
> >  }
> >  
> > +/* Conversion times in uS. */
> > +static const int ina219_conv_time_tab_subsample[] = { 84, 148, 276, 532 };
> > +static const int ina219_conv_time_tab_average[] = { 532, 1060, 2130, 4260,
> > +						    8510, 17020, 34050, 68100};
> > +
> > +static int ina219_lookup_int_time(unsigned int *val_us, int *bits)
> > +{
> > +	if (*val_us > 68100 || *val_us < 84)
> > +		return -EINVAL;
> > +
> > +	if (*val_us <= 532) {
> > +		*bits = find_closest(*val_us, ina219_conv_time_tab_subsample,
> > +				    ARRAY_SIZE(ina219_conv_time_tab_subsample));
> > +		*val_us = ina219_conv_time_tab_subsample[*bits];
> > +	} else {
> > +		*bits = find_closest(*val_us, ina219_conv_time_tab_average,
> > +				    ARRAY_SIZE(ina219_conv_time_tab_average));
> > +		*val_us = ina219_conv_time_tab_average[*bits];
> > +		*bits |= 0x8;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int ina219_set_int_time_vbus(struct ina2xx_chip_info *chip,
> > +				    unsigned int val_us, unsigned int *config)
> > +{
> > +	int bits, ret;
> > +	unsigned int val_us_best = val_us;
> > +
> > +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> > +	if (ret)
> > +		return ret;
> > +
> > +	chip->int_time_vbus = val_us_best;
> > +
> > +	*config &= ~INA219_ITB_MASK;
> > +	*config |= INA219_SHIFT_ITB(bits) & INA219_ITB_MASK;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip,
> > +				      unsigned int val_us, unsigned int *config)
> > +{
> > +	int bits, ret;
> > +	unsigned int val_us_best = val_us;
> > +
> > +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> > +	if (ret)
> > +		return ret;
> > +
> > +	chip->int_time_vshunt = val_us_best;
> > +
> > +	*config &= ~INA219_ITS_MASK;
> > +	*config |= INA219_SHIFT_ITS(bits) & INA219_ITS_MASK;
> > +
> > +	return 0;
> > +}
> > +
> >  static int ina2xx_write_raw(struct iio_dev *indio_dev,
> >  			    struct iio_chan_spec const *chan,
> >  			    int val, int val2, long mask)
> > @@ -308,10 +377,21 @@ static int ina2xx_write_raw(struct iio_dev *indio_dev,
> >  		break;
> >  
> >  	case IIO_CHAN_INFO_INT_TIME:
> > -		if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > -			ret = ina226_set_int_time_vshunt(chip, val2, &tmp);
> > -		else
> > -			ret = ina226_set_int_time_vbus(chip, val2, &tmp);
> > +		if (chip->config->chip_id == ina226) {
> > +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > +				ret = ina226_set_int_time_vshunt(chip, val2,
> > +								 &tmp);
> > +			else
> > +				ret = ina226_set_int_time_vbus(chip, val2,
> > +							       &tmp);
> > +		} else {
> > +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > +				ret = ina219_set_int_time_vshunt(chip, val2,
> > +								 &tmp);
> > +			else
> > +				ret = ina219_set_int_time_vbus(chip, val2,
> > +							       &tmp);
> > +		}
> >  		break;
> >  
> >  	default:
> > @@ -412,7 +492,24 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> >  	return len;
> >  }
> >  
> > -#define INA2XX_CHAN(_type, _index, _address) { \
> > +#define INA219_CHAN(_type, _index, _address) { \
> > +	.type = (_type), \
> > +	.address = (_address), \
> > +	.indexed = 1, \
> > +	.channel = (_index), \
> > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > +			      BIT(IIO_CHAN_INFO_SCALE), \
> > +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> > +	.scan_index = (_index), \
> > +	.scan_type = { \
> > +		.sign = 'u', \
> > +		.realbits = 16, \
> > +		.storagebits = 16, \
> > +		.endianness = IIO_CPU, \
> > +	} \
> > +}
> > +
> > +#define INA226_CHAN(_type, _index, _address) { \
> >  	.type = (_type), \
> >  	.address = (_address), \
> >  	.indexed = 1, \
> > @@ -434,7 +531,25 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> >   * Sampling Freq is a consequence of the integration times of
> >   * the Voltage channels.
> >   */
> > -#define INA2XX_CHAN_VOLTAGE(_index, _address) { \
> > +#define INA219_CHAN_VOLTAGE(_index, _address) { \
> > +	.type = IIO_VOLTAGE, \
> > +	.address = (_address), \
> > +	.indexed = 1, \
> > +	.channel = (_index), \
> > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > +			      BIT(IIO_CHAN_INFO_SCALE) | \
> > +			      BIT(IIO_CHAN_INFO_INT_TIME), \
> > +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> > +	.scan_index = (_index), \
> > +	.scan_type = { \
> > +		.sign = 'u', \
> > +		.realbits = 16, \
> > +		.storagebits = 16, \
> > +		.endianness = IIO_LE, \
> > +	} \
> > +}
> > +
> > +#define INA226_CHAN_VOLTAGE(_index, _address) { \
> >  	.type = IIO_VOLTAGE, \
> >  	.address = (_address), \
> >  	.indexed = 1, \
> > @@ -453,11 +568,20 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> >  	} \
> >  }
> >  
> > -static const struct iio_chan_spec ina2xx_channels[] = {
> > -	INA2XX_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > -	INA2XX_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > -	INA2XX_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > -	INA2XX_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> > +
> > +static const struct iio_chan_spec ina226_channels[] = {
> > +	INA226_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > +	INA226_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > +	INA226_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > +	INA226_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> > +	IIO_CHAN_SOFT_TIMESTAMP(4),
> > +};
> > +
> > +static const struct iio_chan_spec ina219_channels[] = {
> > +	INA219_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > +	INA219_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > +	INA219_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > +	INA219_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> >  	IIO_CHAN_SOFT_TIMESTAMP(4),
> >  };
> >  
> > @@ -592,7 +716,14 @@ static int ina2xx_debug_reg(struct iio_dev *indio_dev,
> >  }
> >  
> >  /* Possible integration times for vshunt and vbus */
> > -static IIO_CONST_ATTR_INT_TIME_AVAIL("0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> > +static IIO_CONST_ATTR_NAMED(ina219_integration_time_available,
> > +			    integration_time_available,
> > +			    "0.000084 0.000148 0.000276 0.000532 0.001060 0.002130 0.004260 0.008510 0.017020 0.034050 0.068100");
> > +
> > +static IIO_CONST_ATTR_NAMED(ina226_integration_time_available,
> > +			    integration_time_available,
> > +			    "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> > +
> >  
> >  static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR,
> >  		       ina2xx_allow_async_readout_show,
> > @@ -602,20 +733,39 @@ static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO | S_IWUSR,
> >  		       ina2xx_shunt_resistor_show,
> >  		       ina2xx_shunt_resistor_store, 0);
> >  
> > -static struct attribute *ina2xx_attributes[] = {
> > +static struct attribute *ina219_attributes[] = {
> > +	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> > +	&iio_const_attr_ina219_integration_time_available.dev_attr.attr,
> > +	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
> > +	NULL,
> > +};
> > +
> > +static struct attribute *ina226_attributes[] = {
> >  	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> > -	&iio_const_attr_integration_time_available.dev_attr.attr,
> > +	&iio_const_attr_ina226_integration_time_available.dev_attr.attr,
> >  	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
> >  	NULL,
> >  };
> >  
> > -static const struct attribute_group ina2xx_attribute_group = {
> > -	.attrs = ina2xx_attributes,
> > +static const struct attribute_group ina219_attribute_group = {
> > +	.attrs = ina219_attributes,
> >  };
> >  
> > -static const struct iio_info ina2xx_info = {
> > +static const struct attribute_group ina226_attribute_group = {
> > +	.attrs = ina226_attributes,
> > +};
> > +
> > +static const struct iio_info ina219_info = {
> > +	.driver_module = THIS_MODULE,
> > +	.attrs = &ina219_attribute_group,
> > +	.read_raw = ina2xx_read_raw,
> > +	.write_raw = ina2xx_write_raw,
> > +	.debugfs_reg_access = ina2xx_debug_reg,
> > +};
> > +
> > +static const struct iio_info ina226_info = {
> >  	.driver_module = THIS_MODULE,
> > -	.attrs = &ina2xx_attribute_group,
> > +	.attrs = &ina226_attribute_group,
> >  	.read_raw = ina2xx_read_raw,
> >  	.write_raw = ina2xx_write_raw,
> >  	.debugfs_reg_access = ina2xx_debug_reg,
> > @@ -686,6 +836,10 @@ static int ina2xx_probe(struct i2c_client *client,
> >  		ina226_set_average(chip, INA226_DEFAULT_AVG, &val);
> >  		ina226_set_int_time_vbus(chip, INA226_DEFAULT_IT, &val);
> >  		ina226_set_int_time_vshunt(chip, INA226_DEFAULT_IT, &val);
> > +	} else {
> > +		chip->avg = 1;
> > +		ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val);
> > +		ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val);
> >  	}
> >  
> >  	ret = ina2xx_init(chip, val);
> > @@ -697,10 +851,16 @@ static int ina2xx_probe(struct i2c_client *client,
> >  	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> >  	indio_dev->dev.parent = &client->dev;
> >  	indio_dev->dev.of_node = client->dev.of_node;
> > -	indio_dev->channels = ina2xx_channels;
> > -	indio_dev->num_channels = ARRAY_SIZE(ina2xx_channels);
> > +	if (id->driver_data == ina226) {
> > +		indio_dev->channels = ina226_channels;
> > +		indio_dev->num_channels = ARRAY_SIZE(ina226_channels);
> > +		indio_dev->info = &ina226_info;
> > +	} else {
> > +		indio_dev->channels = ina219_channels;
> > +		indio_dev->num_channels = ARRAY_SIZE(ina219_channels);
> > +		indio_dev->info = &ina219_info;
> > +	}
> >  	indio_dev->name = id->name;
> > -	indio_dev->info = &ina2xx_info;
> >  	indio_dev->setup_ops = &ina2xx_setup_ops;
> >  
> >  	buffer = devm_iio_kfifo_allocate(&indio_dev->dev);  
> 
> --
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Re: [PATCH v2 2/3] iio: adc: Fix integration time/averaging for INA219/220

[Jonathan Cameron]

On Sun, 28 May 2017 17:00:51 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Wed, 24 May 2017 20:50:45 +0100
> Jonathan Cameron <jic23@kernel.org> wrote:
> 
> > On Wed, 24 May 2017 02:09:06 +0200
> > Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:
> >   
> > > INA226/230/231 has integration times per voltage channel and common
> > > averaging setting for both channels, while the INA219/220 only has a
> > > combined integration time/averaging setting per channel.
> > > Only expose the averaging attribute for the INA226, and expose the correct
> > > integration times for the INA219.
> > > 
> > > Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>    
> > One comment inline, but not really anything I want you to change.
> > 
> > I would like some input from Marc or perhaps Andrew on this though.  
> 
> I'll give this another week I think and if we don't here anything
> go with it as is.  Give me a poke if I look to have missed it though!
Long enough. I guess everyone is busy.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan
> 
> Jonathan
> > > ---
> > >  drivers/iio/adc/ina2xx-adc.c | 204 ++++++++++++++++++++++++++++++++++++++-----
> > >  1 file changed, 182 insertions(+), 22 deletions(-)
> > > 
> > > diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> > > index bba10a1b2fcb..232c0b80d658 100644
> > > --- a/drivers/iio/adc/ina2xx-adc.c
> > > +++ b/drivers/iio/adc/ina2xx-adc.c
> > > @@ -49,6 +49,7 @@
> > >  
> > >  /* settings - depend on use case */
> > >  #define INA219_CONFIG_DEFAULT           0x399F	/* PGA=8 */
> > > +#define INA219_DEFAULT_IT		532
> > >  #define INA226_CONFIG_DEFAULT           0x4327
> > >  #define INA226_DEFAULT_AVG              4
> > >  #define INA226_DEFAULT_IT		1110
> > > @@ -56,19 +57,24 @@
> > >  #define INA2XX_RSHUNT_DEFAULT           10000
> > >  
> > >  /*
> > > - * bit mask for reading the averaging setting in the configuration register
> > > + * bit masks for reading the settings in the configuration register
> > >   * FIXME: use regmap_fields.
> > >   */
> > >  #define INA2XX_MODE_MASK	GENMASK(3, 0)
> > >  
> > > +/* Averaging for VBus/VShunt/Power */
> > >  #define INA226_AVG_MASK		GENMASK(11, 9)
> > >  #define INA226_SHIFT_AVG(val)	((val) << 9)
> > >  
> > >  /* Integration time for VBus */
> > > +#define INA219_ITB_MASK		GENMASK(10, 7)
> > > +#define INA219_SHIFT_ITB(val)	((val) << 7)
> > >  #define INA226_ITB_MASK		GENMASK(8, 6)
> > >  #define INA226_SHIFT_ITB(val)	((val) << 6)
> > >  
> > >  /* Integration time for VShunt */
> > > +#define INA219_ITS_MASK		GENMASK(6, 3)
> > > +#define INA219_SHIFT_ITS(val)	((val) << 3)
> > >  #define INA226_ITS_MASK		GENMASK(5, 3)
> > >  #define INA226_SHIFT_ITS(val)	((val) << 3)
> > >  
> > > @@ -108,6 +114,7 @@ struct ina2xx_config {
> > >  	int bus_voltage_shift;
> > >  	int bus_voltage_lsb;	/* uV */
> > >  	int power_lsb;		/* uW */
> > > +	enum ina2xx_ids chip_id;    
> > I wonder if it would be cleaner to have someting more
> > specific than simply an ID?  Chances are as more parts
> > get added we'll get a steadily growing list of quirks
> > on different sets of them.
> > 
> > Mind you can always make that sort of generalization if /
> > when it is needed ;)  
> > >  };
> > >  
> > >  struct ina2xx_chip_info {
> > > @@ -130,6 +137,7 @@ static const struct ina2xx_config ina2xx_config[] = {
> > >  		.bus_voltage_shift = 3,
> > >  		.bus_voltage_lsb = 4000,
> > >  		.power_lsb = 20000,
> > > +		.chip_id = ina219,
> > >  	},
> > >  	[ina226] = {
> > >  		.config_default = INA226_CONFIG_DEFAULT,
> > > @@ -138,6 +146,7 @@ static const struct ina2xx_config ina2xx_config[] = {
> > >  		.bus_voltage_shift = 0,
> > >  		.bus_voltage_lsb = 1250,
> > >  		.power_lsb = 25000,
> > > +		.chip_id = ina226,
> > >  	},
> > >  };
> > >  
> > > @@ -283,6 +292,66 @@ static int ina226_set_int_time_vshunt(struct ina2xx_chip_info *chip,
> > >  	return 0;
> > >  }
> > >  
> > > +/* Conversion times in uS. */
> > > +static const int ina219_conv_time_tab_subsample[] = { 84, 148, 276, 532 };
> > > +static const int ina219_conv_time_tab_average[] = { 532, 1060, 2130, 4260,
> > > +						    8510, 17020, 34050, 68100};
> > > +
> > > +static int ina219_lookup_int_time(unsigned int *val_us, int *bits)
> > > +{
> > > +	if (*val_us > 68100 || *val_us < 84)
> > > +		return -EINVAL;
> > > +
> > > +	if (*val_us <= 532) {
> > > +		*bits = find_closest(*val_us, ina219_conv_time_tab_subsample,
> > > +				    ARRAY_SIZE(ina219_conv_time_tab_subsample));
> > > +		*val_us = ina219_conv_time_tab_subsample[*bits];
> > > +	} else {
> > > +		*bits = find_closest(*val_us, ina219_conv_time_tab_average,
> > > +				    ARRAY_SIZE(ina219_conv_time_tab_average));
> > > +		*val_us = ina219_conv_time_tab_average[*bits];
> > > +		*bits |= 0x8;
> > > +	}
> > > +
> > > +	return 0;
> > > +}
> > > +
> > > +static int ina219_set_int_time_vbus(struct ina2xx_chip_info *chip,
> > > +				    unsigned int val_us, unsigned int *config)
> > > +{
> > > +	int bits, ret;
> > > +	unsigned int val_us_best = val_us;
> > > +
> > > +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	chip->int_time_vbus = val_us_best;
> > > +
> > > +	*config &= ~INA219_ITB_MASK;
> > > +	*config |= INA219_SHIFT_ITB(bits) & INA219_ITB_MASK;
> > > +
> > > +	return 0;
> > > +}
> > > +
> > > +static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip,
> > > +				      unsigned int val_us, unsigned int *config)
> > > +{
> > > +	int bits, ret;
> > > +	unsigned int val_us_best = val_us;
> > > +
> > > +	ret = ina219_lookup_int_time(&val_us_best, &bits);
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	chip->int_time_vshunt = val_us_best;
> > > +
> > > +	*config &= ~INA219_ITS_MASK;
> > > +	*config |= INA219_SHIFT_ITS(bits) & INA219_ITS_MASK;
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >  static int ina2xx_write_raw(struct iio_dev *indio_dev,
> > >  			    struct iio_chan_spec const *chan,
> > >  			    int val, int val2, long mask)
> > > @@ -308,10 +377,21 @@ static int ina2xx_write_raw(struct iio_dev *indio_dev,
> > >  		break;
> > >  
> > >  	case IIO_CHAN_INFO_INT_TIME:
> > > -		if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > > -			ret = ina226_set_int_time_vshunt(chip, val2, &tmp);
> > > -		else
> > > -			ret = ina226_set_int_time_vbus(chip, val2, &tmp);
> > > +		if (chip->config->chip_id == ina226) {
> > > +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > > +				ret = ina226_set_int_time_vshunt(chip, val2,
> > > +								 &tmp);
> > > +			else
> > > +				ret = ina226_set_int_time_vbus(chip, val2,
> > > +							       &tmp);
> > > +		} else {
> > > +			if (chan->address == INA2XX_SHUNT_VOLTAGE)
> > > +				ret = ina219_set_int_time_vshunt(chip, val2,
> > > +								 &tmp);
> > > +			else
> > > +				ret = ina219_set_int_time_vbus(chip, val2,
> > > +							       &tmp);
> > > +		}
> > >  		break;
> > >  
> > >  	default:
> > > @@ -412,7 +492,24 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> > >  	return len;
> > >  }
> > >  
> > > -#define INA2XX_CHAN(_type, _index, _address) { \
> > > +#define INA219_CHAN(_type, _index, _address) { \
> > > +	.type = (_type), \
> > > +	.address = (_address), \
> > > +	.indexed = 1, \
> > > +	.channel = (_index), \
> > > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > > +			      BIT(IIO_CHAN_INFO_SCALE), \
> > > +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> > > +	.scan_index = (_index), \
> > > +	.scan_type = { \
> > > +		.sign = 'u', \
> > > +		.realbits = 16, \
> > > +		.storagebits = 16, \
> > > +		.endianness = IIO_CPU, \
> > > +	} \
> > > +}
> > > +
> > > +#define INA226_CHAN(_type, _index, _address) { \
> > >  	.type = (_type), \
> > >  	.address = (_address), \
> > >  	.indexed = 1, \
> > > @@ -434,7 +531,25 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> > >   * Sampling Freq is a consequence of the integration times of
> > >   * the Voltage channels.
> > >   */
> > > -#define INA2XX_CHAN_VOLTAGE(_index, _address) { \
> > > +#define INA219_CHAN_VOLTAGE(_index, _address) { \
> > > +	.type = IIO_VOLTAGE, \
> > > +	.address = (_address), \
> > > +	.indexed = 1, \
> > > +	.channel = (_index), \
> > > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > > +			      BIT(IIO_CHAN_INFO_SCALE) | \
> > > +			      BIT(IIO_CHAN_INFO_INT_TIME), \
> > > +	.info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> > > +	.scan_index = (_index), \
> > > +	.scan_type = { \
> > > +		.sign = 'u', \
> > > +		.realbits = 16, \
> > > +		.storagebits = 16, \
> > > +		.endianness = IIO_LE, \
> > > +	} \
> > > +}
> > > +
> > > +#define INA226_CHAN_VOLTAGE(_index, _address) { \
> > >  	.type = IIO_VOLTAGE, \
> > >  	.address = (_address), \
> > >  	.indexed = 1, \
> > > @@ -453,11 +568,20 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev,
> > >  	} \
> > >  }
> > >  
> > > -static const struct iio_chan_spec ina2xx_channels[] = {
> > > -	INA2XX_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > > -	INA2XX_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > > -	INA2XX_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > > -	INA2XX_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> > > +
> > > +static const struct iio_chan_spec ina226_channels[] = {
> > > +	INA226_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > > +	INA226_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > > +	INA226_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > > +	INA226_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> > > +	IIO_CHAN_SOFT_TIMESTAMP(4),
> > > +};
> > > +
> > > +static const struct iio_chan_spec ina219_channels[] = {
> > > +	INA219_CHAN_VOLTAGE(0, INA2XX_SHUNT_VOLTAGE),
> > > +	INA219_CHAN_VOLTAGE(1, INA2XX_BUS_VOLTAGE),
> > > +	INA219_CHAN(IIO_POWER, 2, INA2XX_POWER),
> > > +	INA219_CHAN(IIO_CURRENT, 3, INA2XX_CURRENT),
> > >  	IIO_CHAN_SOFT_TIMESTAMP(4),
> > >  };
> > >  
> > > @@ -592,7 +716,14 @@ static int ina2xx_debug_reg(struct iio_dev *indio_dev,
> > >  }
> > >  
> > >  /* Possible integration times for vshunt and vbus */
> > > -static IIO_CONST_ATTR_INT_TIME_AVAIL("0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> > > +static IIO_CONST_ATTR_NAMED(ina219_integration_time_available,
> > > +			    integration_time_available,
> > > +			    "0.000084 0.000148 0.000276 0.000532 0.001060 0.002130 0.004260 0.008510 0.017020 0.034050 0.068100");
> > > +
> > > +static IIO_CONST_ATTR_NAMED(ina226_integration_time_available,
> > > +			    integration_time_available,
> > > +			    "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244");
> > > +
> > >  
> > >  static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR,
> > >  		       ina2xx_allow_async_readout_show,
> > > @@ -602,20 +733,39 @@ static IIO_DEVICE_ATTR(in_shunt_resistor, S_IRUGO | S_IWUSR,
> > >  		       ina2xx_shunt_resistor_show,
> > >  		       ina2xx_shunt_resistor_store, 0);
> > >  
> > > -static struct attribute *ina2xx_attributes[] = {
> > > +static struct attribute *ina219_attributes[] = {
> > > +	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> > > +	&iio_const_attr_ina219_integration_time_available.dev_attr.attr,
> > > +	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
> > > +	NULL,
> > > +};
> > > +
> > > +static struct attribute *ina226_attributes[] = {
> > >  	&iio_dev_attr_in_allow_async_readout.dev_attr.attr,
> > > -	&iio_const_attr_integration_time_available.dev_attr.attr,
> > > +	&iio_const_attr_ina226_integration_time_available.dev_attr.attr,
> > >  	&iio_dev_attr_in_shunt_resistor.dev_attr.attr,
> > >  	NULL,
> > >  };
> > >  
> > > -static const struct attribute_group ina2xx_attribute_group = {
> > > -	.attrs = ina2xx_attributes,
> > > +static const struct attribute_group ina219_attribute_group = {
> > > +	.attrs = ina219_attributes,
> > >  };
> > >  
> > > -static const struct iio_info ina2xx_info = {
> > > +static const struct attribute_group ina226_attribute_group = {
> > > +	.attrs = ina226_attributes,
> > > +};
> > > +
> > > +static const struct iio_info ina219_info = {
> > > +	.driver_module = THIS_MODULE,
> > > +	.attrs = &ina219_attribute_group,
> > > +	.read_raw = ina2xx_read_raw,
> > > +	.write_raw = ina2xx_write_raw,
> > > +	.debugfs_reg_access = ina2xx_debug_reg,
> > > +};
> > > +
> > > +static const struct iio_info ina226_info = {
> > >  	.driver_module = THIS_MODULE,
> > > -	.attrs = &ina2xx_attribute_group,
> > > +	.attrs = &ina226_attribute_group,
> > >  	.read_raw = ina2xx_read_raw,
> > >  	.write_raw = ina2xx_write_raw,
> > >  	.debugfs_reg_access = ina2xx_debug_reg,
> > > @@ -686,6 +836,10 @@ static int ina2xx_probe(struct i2c_client *client,
> > >  		ina226_set_average(chip, INA226_DEFAULT_AVG, &val);
> > >  		ina226_set_int_time_vbus(chip, INA226_DEFAULT_IT, &val);
> > >  		ina226_set_int_time_vshunt(chip, INA226_DEFAULT_IT, &val);
> > > +	} else {
> > > +		chip->avg = 1;
> > > +		ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val);
> > > +		ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val);
> > >  	}
> > >  
> > >  	ret = ina2xx_init(chip, val);
> > > @@ -697,10 +851,16 @@ static int ina2xx_probe(struct i2c_client *client,
> > >  	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> > >  	indio_dev->dev.parent = &client->dev;
> > >  	indio_dev->dev.of_node = client->dev.of_node;
> > > -	indio_dev->channels = ina2xx_channels;
> > > -	indio_dev->num_channels = ARRAY_SIZE(ina2xx_channels);
> > > +	if (id->driver_data == ina226) {
> > > +		indio_dev->channels = ina226_channels;
> > > +		indio_dev->num_channels = ARRAY_SIZE(ina226_channels);
> > > +		indio_dev->info = &ina226_info;
> > > +	} else {
> > > +		indio_dev->channels = ina219_channels;
> > > +		indio_dev->num_channels = ARRAY_SIZE(ina219_channels);
> > > +		indio_dev->info = &ina219_info;
> > > +	}
> > >  	indio_dev->name = id->name;
> > > -	indio_dev->info = &ina2xx_info;
> > >  	indio_dev->setup_ops = &ina2xx_setup_ops;
> > >  
> > >  	buffer = devm_iio_kfifo_allocate(&indio_dev->dev);    
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html  
> 
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[PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Stefan Brüns]

While the INA226 has a conversion ready flag (CVRF) in the R/W Mask/Enable
register with read-to-clear semantics, the corresponding bit of the INA219
(CNVR) is part of the bus voltage register. The flag is cleared by reading
the power register.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---
 drivers/iio/adc/ina2xx-adc.c | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 232c0b80d658..68884d26b50c 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -44,6 +44,7 @@
 
 #define INA226_MASK_ENABLE		0x06
 #define INA226_CVRF			BIT(3)
+#define INA219_CNVR			BIT(1)
 
 #define INA2XX_MAX_REGISTERS            8
 
@@ -592,6 +593,7 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
 	int bit, ret, i = 0;
 	s64 time_a, time_b;
 	unsigned int alert;
+	int cnvr_need_clear = 0;
 
 	time_a = iio_get_time_ns(indio_dev);
 
@@ -603,22 +605,30 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
 	 * we check the ConVersionReadyFlag.
 	 * On hardware that supports using the ALERT pin to toggle a
 	 * GPIO a triggered buffer could be used instead.
-	 * For now, we pay for that extra read of the ALERT register
+	 * For now, we do an extra read of the MASK_ENABLE register (INA226)
+	 * resp. the BUS_VOLTAGE register (INA219).
 	 */
 	if (!chip->allow_async_readout)
 		do {
-			ret = regmap_read(chip->regmap, INA226_MASK_ENABLE,
-					  &alert);
+			if (chip->config->chip_id == ina226) {
+				ret = regmap_read(chip->regmap,
+						  INA226_MASK_ENABLE, &alert);
+				alert &= INA226_CVRF;
+			} else {
+				ret = regmap_read(chip->regmap,
+						  INA2XX_BUS_VOLTAGE, &alert);
+				alert &= INA219_CNVR;
+				cnvr_need_clear = alert;
+			}
+
 			if (ret < 0)
 				return ret;
 
-			alert &= INA226_CVRF;
 		} while (!alert);
 
 	/*
-	 * Single register reads: bulk_read will not work with ina226
-	 * as there is no auto-increment of the address register for
-	 * data length longer than 16bits.
+	 * Single register reads: bulk_read will not work with ina226/219
+	 * as there is no auto-increment of the register pointer.
 	 */
 	for_each_set_bit(bit, indio_dev->active_scan_mask,
 			 indio_dev->masklength) {
@@ -630,6 +640,18 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
 			return ret;
 
 		data[i++] = val;
+
+		if (INA2XX_SHUNT_VOLTAGE + bit == INA2XX_POWER)
+			cnvr_need_clear = 0;
+	}
+
+	/* Dummy read on INA219 power register to clear CNVR flag */
+	if (cnvr_need_clear && chip->config->chip_id == ina219) {
+		unsigned int val;
+
+		ret = regmap_read(chip->regmap, INA2XX_POWER, &val);
+		if (ret < 0)
+			return ret;
 	}
 
 	time_b = iio_get_time_ns(indio_dev);
-- 
2.12.2

Re: [PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Jonathan Cameron]

On Wed, 24 May 2017 02:09:07 +0200
Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:

> While the INA226 has a conversion ready flag (CVRF) in the R/W Mask/Enable
> register with read-to-clear semantics, the corresponding bit of the INA219
> (CNVR) is part of the bus voltage register. The flag is cleared by reading
> the power register.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Again, looks good to me, but I would like input form Marc or Andrew
who are more familiar with these devices than me!

Ping me in a week or two if nothing is happening and I look to have
lost these!

Thanks,

Jonathan
> ---
>  drivers/iio/adc/ina2xx-adc.c | 36 +++++++++++++++++++++++++++++-------
>  1 file changed, 29 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> index 232c0b80d658..68884d26b50c 100644
> --- a/drivers/iio/adc/ina2xx-adc.c
> +++ b/drivers/iio/adc/ina2xx-adc.c
> @@ -44,6 +44,7 @@
>  
>  #define INA226_MASK_ENABLE		0x06
>  #define INA226_CVRF			BIT(3)
> +#define INA219_CNVR			BIT(1)
>  
>  #define INA2XX_MAX_REGISTERS            8
>  
> @@ -592,6 +593,7 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
>  	int bit, ret, i = 0;
>  	s64 time_a, time_b;
>  	unsigned int alert;
> +	int cnvr_need_clear = 0;
>  
>  	time_a = iio_get_time_ns(indio_dev);
>  
> @@ -603,22 +605,30 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
>  	 * we check the ConVersionReadyFlag.
>  	 * On hardware that supports using the ALERT pin to toggle a
>  	 * GPIO a triggered buffer could be used instead.
> -	 * For now, we pay for that extra read of the ALERT register
> +	 * For now, we do an extra read of the MASK_ENABLE register (INA226)
> +	 * resp. the BUS_VOLTAGE register (INA219).
>  	 */
>  	if (!chip->allow_async_readout)
>  		do {
> -			ret = regmap_read(chip->regmap, INA226_MASK_ENABLE,
> -					  &alert);
> +			if (chip->config->chip_id == ina226) {
> +				ret = regmap_read(chip->regmap,
> +						  INA226_MASK_ENABLE, &alert);
> +				alert &= INA226_CVRF;
> +			} else {
> +				ret = regmap_read(chip->regmap,
> +						  INA2XX_BUS_VOLTAGE, &alert);
> +				alert &= INA219_CNVR;
> +				cnvr_need_clear = alert;
> +			}
> +
>  			if (ret < 0)
>  				return ret;
>  
> -			alert &= INA226_CVRF;
>  		} while (!alert);
>  
>  	/*
> -	 * Single register reads: bulk_read will not work with ina226
> -	 * as there is no auto-increment of the address register for
> -	 * data length longer than 16bits.
> +	 * Single register reads: bulk_read will not work with ina226/219
> +	 * as there is no auto-increment of the register pointer.
>  	 */
>  	for_each_set_bit(bit, indio_dev->active_scan_mask,
>  			 indio_dev->masklength) {
> @@ -630,6 +640,18 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
>  			return ret;
>  
>  		data[i++] = val;
> +
> +		if (INA2XX_SHUNT_VOLTAGE + bit == INA2XX_POWER)
> +			cnvr_need_clear = 0;
> +	}
> +
> +	/* Dummy read on INA219 power register to clear CNVR flag */
> +	if (cnvr_need_clear && chip->config->chip_id == ina219) {
> +		unsigned int val;
> +
> +		ret = regmap_read(chip->regmap, INA2XX_POWER, &val);
> +		if (ret < 0)
> +			return ret;
>  	}
>  
>  	time_b = iio_get_time_ns(indio_dev);

Re: [PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Jonathan Cameron]

On Wed, 24 May 2017 20:53:35 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Wed, 24 May 2017 02:09:07 +0200
> Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:
> 
> > While the INA226 has a conversion ready flag (CVRF) in the R/W Mask/Enable
> > register with read-to-clear semantics, the corresponding bit of the INA219
> > (CNVR) is part of the bus voltage register. The flag is cleared by reading
> > the power register.
> > 
> > Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>  
> Again, looks good to me, but I would like input form Marc or Andrew
> who are more familiar with these devices than me!
> 
> Ping me in a week or two if nothing is happening and I look to have
> lost these!
Ah Marc's old email is bouncing.  If no one has a more up to
data address I guess we'll be looking at Andrew to have a chance to
respond (which is more likely if I actually cc him ;)
> 
> Thanks,
> 
> Jonathan
> > ---
> >  drivers/iio/adc/ina2xx-adc.c | 36 +++++++++++++++++++++++++++++-------
> >  1 file changed, 29 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> > index 232c0b80d658..68884d26b50c 100644
> > --- a/drivers/iio/adc/ina2xx-adc.c
> > +++ b/drivers/iio/adc/ina2xx-adc.c
> > @@ -44,6 +44,7 @@
> >  
> >  #define INA226_MASK_ENABLE		0x06
> >  #define INA226_CVRF			BIT(3)
> > +#define INA219_CNVR			BIT(1)
> >  
> >  #define INA2XX_MAX_REGISTERS            8
> >  
> > @@ -592,6 +593,7 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
> >  	int bit, ret, i = 0;
> >  	s64 time_a, time_b;
> >  	unsigned int alert;
> > +	int cnvr_need_clear = 0;
> >  
> >  	time_a = iio_get_time_ns(indio_dev);
> >  
> > @@ -603,22 +605,30 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
> >  	 * we check the ConVersionReadyFlag.
> >  	 * On hardware that supports using the ALERT pin to toggle a
> >  	 * GPIO a triggered buffer could be used instead.
> > -	 * For now, we pay for that extra read of the ALERT register
> > +	 * For now, we do an extra read of the MASK_ENABLE register (INA226)
> > +	 * resp. the BUS_VOLTAGE register (INA219).
> >  	 */
> >  	if (!chip->allow_async_readout)
> >  		do {
> > -			ret = regmap_read(chip->regmap, INA226_MASK_ENABLE,
> > -					  &alert);
> > +			if (chip->config->chip_id == ina226) {
> > +				ret = regmap_read(chip->regmap,
> > +						  INA226_MASK_ENABLE, &alert);
> > +				alert &= INA226_CVRF;
> > +			} else {
> > +				ret = regmap_read(chip->regmap,
> > +						  INA2XX_BUS_VOLTAGE, &alert);
> > +				alert &= INA219_CNVR;
> > +				cnvr_need_clear = alert;
> > +			}
> > +
> >  			if (ret < 0)
> >  				return ret;
> >  
> > -			alert &= INA226_CVRF;
> >  		} while (!alert);
> >  
> >  	/*
> > -	 * Single register reads: bulk_read will not work with ina226
> > -	 * as there is no auto-increment of the address register for
> > -	 * data length longer than 16bits.
> > +	 * Single register reads: bulk_read will not work with ina226/219
> > +	 * as there is no auto-increment of the register pointer.
> >  	 */
> >  	for_each_set_bit(bit, indio_dev->active_scan_mask,
> >  			 indio_dev->masklength) {
> > @@ -630,6 +640,18 @@ static int ina2xx_work_buffer(struct iio_dev *indio_dev)
> >  			return ret;
> >  
> >  		data[i++] = val;
> > +
> > +		if (INA2XX_SHUNT_VOLTAGE + bit == INA2XX_POWER)
> > +			cnvr_need_clear = 0;
> > +	}
> > +
> > +	/* Dummy read on INA219 power register to clear CNVR flag */
> > +	if (cnvr_need_clear && chip->config->chip_id == ina219) {
> > +		unsigned int val;
> > +
> > +		ret = regmap_read(chip->regmap, INA2XX_POWER, &val);
> > +		if (ret < 0)
> > +			return ret;
> >  	}
> >  
> >  	time_b = iio_get_time_ns(indio_dev);  
> 
> --
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Re: [PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Brüns, Stefan]

On Mittwoch, 24. Mai 2017 21:56:54 CEST Jonathan Cameron wrote:
> On Wed, 24 May 2017 20:53:35 +0100
>=20
> Jonathan Cameron <jic23@kernel.org> wrote:
> > On Wed, 24 May 2017 02:09:07 +0200
> >=20
> > Stefan Br=FCns <stefan.bruens@rwth-aachen.de> wrote:
> > > While the INA226 has a conversion ready flag (CVRF) in the R/W
> > > Mask/Enable
> > > register with read-to-clear semantics, the corresponding bit of the
> > > INA219
> > > (CNVR) is part of the bus voltage register. The flag is cleared by
> > > reading
> > > the power register.
> > >=20
> > > Signed-off-by: Stefan Br=FCns <stefan.bruens@rwth-aachen.de>
> >=20
> > Again, looks good to me, but I would like input form Marc or Andrew
> > who are more familiar with these devices than me!
> >=20
> > Ping me in a week or two if nothing is happening and I look to have
> > lost these!
>=20
> Ah Marc's old email is bouncing.  If no one has a more up to
> data address I guess we'll be looking at Andrew to have a chance to
> respond (which is more likely if I actually cc him ;)

Ping ;-)

Kind regards,

Stefan=

Re: [PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Andrew F. Davis]

On 06/19/2017 01:24 PM, Brüns, Stefan wrote:
> On Mittwoch, 24. Mai 2017 21:56:54 CEST Jonathan Cameron wrote:
>> On Wed, 24 May 2017 20:53:35 +0100
>>
>> Jonathan Cameron <jic23@kernel.org> wrote:
>>> On Wed, 24 May 2017 02:09:07 +0200
>>>
>>> Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:
>>>> While the INA226 has a conversion ready flag (CVRF) in the R/W
>>>> Mask/Enable
>>>> register with read-to-clear semantics, the corresponding bit of the
>>>> INA219
>>>> (CNVR) is part of the bus voltage register. The flag is cleared by
>>>> reading
>>>> the power register.
>>>>
>>>> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
>>>
>>> Again, looks good to me, but I would like input form Marc or Andrew
>>> who are more familiar with these devices than me!
>>>
>>> Ping me in a week or two if nothing is happening and I look to have
>>> lost these!
>>
>> Ah Marc's old email is bouncing.  If no one has a more up to
>> data address I guess we'll be looking at Andrew to have a chance to
>> respond (which is more likely if I actually cc him ;)
> 
> Ping ;-)
> 

As for me, my silence is approval, nothing looks incorrect to me.

> Kind regards,
> 
> Stefan
> 

Re: [PATCH v2 3/3] iio: adc: Fix polling of INA219 conversion ready flag

[Jonathan Cameron]

On Mon, 19 Jun 2017 13:30:31 -0500
"Andrew F. Davis" <afd@ti.com> wrote:

> On 06/19/2017 01:24 PM, Brüns, Stefan wrote:
> > On Mittwoch, 24. Mai 2017 21:56:54 CEST Jonathan Cameron wrote:  
> >> On Wed, 24 May 2017 20:53:35 +0100
> >>
> >> Jonathan Cameron <jic23@kernel.org> wrote:  
> >>> On Wed, 24 May 2017 02:09:07 +0200
> >>>
> >>> Stefan Brüns <stefan.bruens@rwth-aachen.de> wrote:  
> >>>> While the INA226 has a conversion ready flag (CVRF) in the R/W
> >>>> Mask/Enable
> >>>> register with read-to-clear semantics, the corresponding bit of the
> >>>> INA219
> >>>> (CNVR) is part of the bus voltage register. The flag is cleared by
> >>>> reading
> >>>> the power register.
> >>>>
> >>>> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>  
> >>>
> >>> Again, looks good to me, but I would like input form Marc or Andrew
> >>> who are more familiar with these devices than me!
> >>>
> >>> Ping me in a week or two if nothing is happening and I look to have
> >>> lost these!  
> >>
> >> Ah Marc's old email is bouncing.  If no one has a more up to
> >> data address I guess we'll be looking at Andrew to have a chance to
> >> respond (which is more likely if I actually cc him ;)  
> > 
> > Ping ;-)
> >   
> 
> As for me, my silence is approval, nothing looks incorrect to me.
Applied to the togreg branch of iio.git and pushed out as testing.
It's late enough in the cycle that any fixes will probably be post
merge window now.  Also this doesn't apply to my fixes-togreg branch
(presumably due to the earlier patches).

Thanks for the ping.

Jonathan
> 
> > Kind regards,
> > 
> > Stefan
> >   
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