[PATCH 2/3] iio: core: introduce IIO_CHAN_INFO_HARDWAREGAIN

[PATCH 2/3] iio: core: introduce IIO_CHAN_INFO_HARDWAREGAIN

[michael.hennerich]

From: Michael Hennerich <michael.hennerich@analog.com>

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
---
 Documentation/ABI/testing/sysfs-bus-iio |    7 +++++++
 drivers/iio/industrialio-core.c         |    1 +
 include/linux/iio/iio.h                 |    5 +++++
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index ccd8c84..cfedf63 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -282,6 +282,13 @@ Description:
 		If a discrete set of scale values are available, they
 		are listed in this attribute.
 
+What		/sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain
+KernelVersion:	2.6.35
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Hardware applied gain factor. If shared across all channels,
+		<type>_hardwaregain is used.
+
 What:		/sys/.../in_accel_filter_low_pass_3db_frequency
 What:		/sys/.../in_magn_filter_low_pass_3db_frequency
 What:		/sys/.../in_anglvel_filter_low_pass_3db_frequency
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index e799d35..874fb70 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -91,6 +91,7 @@ static const char * const iio_chan_info_postfix[] = {
 	[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
 	[IIO_CHAN_INFO_FREQUENCY] = "frequency",
 	[IIO_CHAN_INFO_PHASE] = "phase",
+	[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
 };
 
 const struct iio_chan_spec
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 6fdbdb8..897c6b0 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -34,6 +34,7 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_SAMP_FREQ,
 	IIO_CHAN_INFO_FREQUENCY,
 	IIO_CHAN_INFO_PHASE,
+	IIO_CHAN_INFO_HARDWAREGAIN,
 };
 
 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
@@ -95,6 +96,10 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PHASE)
 #define IIO_CHAN_INFO_PHASE_SHARED_BIT			\
 	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PHASE)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT			\
+	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SHARED_BIT			\
+	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
 
 enum iio_endian {
 	IIO_CPU,
-- 
1.7.0.4

Re: [PATCH 2/3] iio: core: introduce IIO_CHAN_INFO_HARDWAREGAIN

[Jonathan Cameron]

On 5/9/2012 11:36 AM, michael.hennerich@analog.com wrote:
> From: Michael Hennerich<michael.hennerich@analog.com>
>
> Signed-off-by: Michael Hennerich<michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
> ---
>   Documentation/ABI/testing/sysfs-bus-iio |    7 +++++++
>   drivers/iio/industrialio-core.c         |    1 +
>   include/linux/iio/iio.h                 |    5 +++++
>   3 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index ccd8c84..cfedf63 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -282,6 +282,13 @@ Description:
>   		If a discrete set of scale values are available, they
>   		are listed in this attribute.
>
> +What		/sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain
> +KernelVersion:	2.6.35
> +Contact:	linux-iio@vger.kernel.org
> +Description:
> +		Hardware applied gain factor. If shared across all channels,
> +		<type>_hardwaregain is used.
> +
>   What:		/sys/.../in_accel_filter_low_pass_3db_frequency
>   What:		/sys/.../in_magn_filter_low_pass_3db_frequency
>   What:		/sys/.../in_anglvel_filter_low_pass_3db_frequency
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index e799d35..874fb70 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -91,6 +91,7 @@ static const char * const iio_chan_info_postfix[] = {
>   	[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
>   	[IIO_CHAN_INFO_FREQUENCY] = "frequency",
>   	[IIO_CHAN_INFO_PHASE] = "phase",
> +	[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
>   };
>
>   const struct iio_chan_spec
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index 6fdbdb8..897c6b0 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -34,6 +34,7 @@ enum iio_chan_info_enum {
>   	IIO_CHAN_INFO_SAMP_FREQ,
>   	IIO_CHAN_INFO_FREQUENCY,
>   	IIO_CHAN_INFO_PHASE,
> +	IIO_CHAN_INFO_HARDWAREGAIN,
>   };
>
>   #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
> @@ -95,6 +96,10 @@ enum iio_chan_info_enum {
>   	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PHASE)
>   #define IIO_CHAN_INFO_PHASE_SHARED_BIT			\
>   	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PHASE)
> +#define IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT			\
> +	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
> +#define IIO_CHAN_INFO_HARDWAREGAIN_SHARED_BIT			\
> +	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
>
>   enum iio_endian {
>   	IIO_CPU,

[PATCH 1/3] iio: core: introduce dB scle: IIO_VAL_INT_PLUS_MICRO_DB

[michael.hennerich]

From: Michael Hennerich <michael.hennerich@analog.com>

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron<jic23@kernel.org>
---
 drivers/iio/industrialio-core.c |   19 +++++++++++++------
 include/linux/iio/types.h       |    1 +
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b39a587..425cd4c 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -295,26 +295,33 @@ static ssize_t iio_read_channel_info(struct device *dev,
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 	int val, val2;
+	bool scale_db = false;
 	int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
 					    &val, &val2, this_attr->address);

 	if (ret < 0)
 		return ret;

-	if (ret == IIO_VAL_INT)
+	switch (ret) {
+	case IIO_VAL_INT:
 		return sprintf(buf, "%d\n", val);
-	else if (ret == IIO_VAL_INT_PLUS_MICRO) {
+	case IIO_VAL_INT_PLUS_MICRO_DB:
+		scale_db = true;
+	case IIO_VAL_INT_PLUS_MICRO:
 		if (val2 < 0)
-			return sprintf(buf, "-%d.%06u\n", val, -val2);
+			return sprintf(buf, "-%d.%06u%s\n", val, -val2,
+				scale_db ? " dB" : "");
 		else
-			return sprintf(buf, "%d.%06u\n", val, val2);
-	} else if (ret == IIO_VAL_INT_PLUS_NANO) {
+			return sprintf(buf, "%d.%06u%s\n", val, val2,
+				scale_db ? " dB" : "");
+	case IIO_VAL_INT_PLUS_NANO:
 		if (val2 < 0)
 			return sprintf(buf, "-%d.%09u\n", val, -val2);
 		else
 			return sprintf(buf, "%d.%09u\n", val, val2);
-	} else
+	default:
 		return 0;
+	}
 }

 static ssize_t iio_write_channel_info(struct device *dev,
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index a471fd5..1b073b1 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -50,5 +50,6 @@ enum iio_modifier {
 #define IIO_VAL_INT 1
 #define IIO_VAL_INT_PLUS_MICRO 2
 #define IIO_VAL_INT_PLUS_NANO 3
+#define IIO_VAL_INT_PLUS_MICRO_DB 4

 #endif /* _IIO_TYPES_H_ */
--
1.7.0.4

[PATCH 2/3] iio: core: introduce IIO_CHAN_INFO_HARDWAREGAIN

[michael.hennerich]

From: Michael Hennerich <michael.hennerich@analog.com>

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron<jic23@kernel.org>
---
 Documentation/ABI/testing/sysfs-bus-iio |    7 +++++++
 drivers/iio/industrialio-core.c         |    1 +
 include/linux/iio/iio.h                 |    5 +++++
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 2ce4dad..5bc8a47 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -280,6 +280,13 @@ Description:
 		If a discrete set of scale values are available, they
 		are listed in this attribute.

+What		/sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain
+KernelVersion:	2.6.35
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Hardware applied gain factor. If shared across all channels,
+		<type>_hardwaregain is used.
+
 What:		/sys/.../in_accel_filter_low_pass_3db_frequency
 What:		/sys/.../in_magn_filter_low_pass_3db_frequency
 What:		/sys/.../in_anglvel_filter_low_pass_3db_frequency
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 425cd4c..86f3460 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -91,6 +91,7 @@ static const char * const iio_chan_info_postfix[] = {
 	[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
 	[IIO_CHAN_INFO_FREQUENCY] = "frequency",
 	[IIO_CHAN_INFO_PHASE] = "phase",
+	[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
 };

 const struct iio_chan_spec
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 6fdbdb8..897c6b0 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -34,6 +34,7 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_SAMP_FREQ,
 	IIO_CHAN_INFO_FREQUENCY,
 	IIO_CHAN_INFO_PHASE,
+	IIO_CHAN_INFO_HARDWAREGAIN,
 };

 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
@@ -95,6 +96,10 @@ enum iio_chan_info_enum {
 	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PHASE)
 #define IIO_CHAN_INFO_PHASE_SHARED_BIT			\
 	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PHASE)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT			\
+	IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SHARED_BIT			\
+	IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_HARDWAREGAIN)

 enum iio_endian {
 	IIO_CPU,
--
1.7.0.4

[PATCH 3/3] iio: amplifiers: New driver for AD8366 Dual-Digital Variable Gain Amplifier

[michael.hennerich]

From: Michael Hennerich <michael.hennerich@analog.com>

Changes since V1:

Apply review feedback:
	Introduce and use IIO_CHAN_INFO_HARDWAREGAIN
	Introduce and use Use IIO_VAL_INT_PLUS_MICRO_DB

Modify out of staging include paths.
Convert to new iio core API naming.

Changes since V2:

more sanity checking in write_raw

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron<jic23@kernel.org>
---
 drivers/iio/Kconfig             |    2 +
 drivers/iio/Makefile            |    2 +
 drivers/iio/amplifiers/Kconfig  |   17 +++
 drivers/iio/amplifiers/Makefile |    5 +
 drivers/iio/amplifiers/ad8366.c |  222 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 248 insertions(+), 0 deletions(-)
 create mode 100644 drivers/iio/amplifiers/Kconfig
 create mode 100644 drivers/iio/amplifiers/Makefile
 create mode 100644 drivers/iio/amplifiers/ad8366.c

diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 3ab7d48..bb1e35c 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -48,4 +48,6 @@ config IIO_CONSUMERS_PER_TRIGGER
 	This value controls the maximum number of consumers that a
 	given trigger may handle. Default is 2.

+source "drivers/iio/amplifiers/Kconfig"
+
 endif # IIO
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index d5fc57d..5552491 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -8,3 +8,5 @@ industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
 industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o

 obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
+
+obj-y += amplifiers/
diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig
new file mode 100644
index 0000000..05d707e
--- /dev/null
+++ b/drivers/iio/amplifiers/Kconfig
@@ -0,0 +1,17 @@
+#
+# Gain Amplifiers, etc.
+#
+menu "Amplifiers"
+
+config AD8366
+	tristate "Analog Devices AD8366 VGA"
+	depends on SPI
+	select BITREVERSE
+	help
+	  Say yes here to build support for Analog Devices AD8366
+	  SPI Dual-Digital Variable Gain Amplifier (VGA).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad8366.
+
+endmenu
diff --git a/drivers/iio/amplifiers/Makefile b/drivers/iio/amplifiers/Makefile
new file mode 100644
index 0000000..a6ca366
--- /dev/null
+++ b/drivers/iio/amplifiers/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile iio/amplifiers
+#
+
+obj-$(CONFIG_AD8366) += ad8366.o
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
new file mode 100644
index 0000000..d8281cd
--- /dev/null
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -0,0 +1,222 @@
+/*
+ * AD8366 SPI Dual-Digital Variable Gain Amplifier (VGA)
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/bitrev.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+struct ad8366_state {
+	struct spi_device	*spi;
+	struct regulator	*reg;
+	unsigned char		ch[2];
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	unsigned char		data[2] ____cacheline_aligned;
+};
+
+static int ad8366_write(struct iio_dev *indio_dev,
+			unsigned char ch_a, char unsigned ch_b)
+{
+	struct ad8366_state *st = iio_priv(indio_dev);
+	int ret;
+
+	ch_a = bitrev8(ch_a & 0x3F);
+	ch_b = bitrev8(ch_b & 0x3F);
+
+	st->data[0] = ch_b >> 4;
+	st->data[1] = (ch_b << 4) | (ch_a >> 2);
+
+	ret = spi_write(st->spi, st->data, ARRAY_SIZE(st->data));
+	if (ret < 0)
+		dev_err(&indio_dev->dev, "write failed (%d)", ret);
+
+	return ret;
+}
+
+static int ad8366_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	struct ad8366_state *st = iio_priv(indio_dev);
+	int ret;
+	unsigned code;
+
+	mutex_lock(&indio_dev->mlock);
+	switch (m) {
+	case IIO_CHAN_INFO_HARDWAREGAIN:
+		code = st->ch[chan->channel];
+
+		/* Values in dB */
+		code = code * 253 + 4500;
+		*val = code / 1000;
+		*val2 = (code % 1000) * 1000;
+
+		ret = IIO_VAL_INT_PLUS_MICRO_DB;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+};
+
+static int ad8366_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
+{
+	struct ad8366_state *st = iio_priv(indio_dev);
+	unsigned code;
+	int ret;
+
+	if (val < 0 || val2 < 0)
+		return -EINVAL;
+
+	/* Values in dB */
+	code = (((u8)val * 1000) + ((u32)val2 / 1000));
+
+	if (code > 20500 || code < 4500)
+		return -EINVAL;
+
+	code = (code - 4500) / 253;
+
+	mutex_lock(&indio_dev->mlock);
+	switch (mask) {
+	case IIO_CHAN_INFO_HARDWAREGAIN:
+		st->ch[chan->channel] = code;
+		ret = ad8366_write(indio_dev, st->ch[0], st->ch[1]);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+}
+
+static const struct iio_info ad8366_info = {
+	.read_raw = &ad8366_read_raw,
+	.write_raw = &ad8366_write_raw,
+	.driver_module = THIS_MODULE,
+};
+
+#define AD8366_CHAN(_channel) {				\
+	.type = IIO_VOLTAGE,				\
+	.output = 1,					\
+	.indexed = 1,					\
+	.channel = _channel,				\
+	.info_mask = IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT,\
+}
+
+static const struct iio_chan_spec ad8366_channels[] = {
+	AD8366_CHAN(0),
+	AD8366_CHAN(1),
+};
+
+static int __devinit ad8366_probe(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev;
+	struct ad8366_state *st;
+	int ret;
+
+	indio_dev = iio_device_alloc(sizeof(*st));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+
+	st->reg = regulator_get(&spi->dev, "vcc");
+	if (!IS_ERR(st->reg)) {
+		ret = regulator_enable(st->reg);
+		if (ret)
+			goto error_put_reg;
+	}
+
+	spi_set_drvdata(spi, indio_dev);
+	st->spi = spi;
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->info = &ad8366_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ad8366_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_disable_reg;
+
+	ad8366_write(indio_dev, 0 , 0);
+
+	return 0;
+
+error_disable_reg:
+	if (!IS_ERR(st->reg))
+		regulator_disable(st->reg);
+error_put_reg:
+	if (!IS_ERR(st->reg))
+		regulator_put(st->reg);
+
+	iio_device_free(indio_dev);
+
+	return ret;
+}
+
+static int __devexit ad8366_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+	struct ad8366_state *st = iio_priv(indio_dev);
+	struct regulator *reg = st->reg;
+
+	iio_device_unregister(indio_dev);
+
+	if (!IS_ERR(reg)) {
+		regulator_disable(reg);
+		regulator_put(reg);
+	}
+
+	iio_device_free(indio_dev);
+
+	return 0;
+}
+
+static const struct spi_device_id ad8366_id[] = {
+	{"ad8366", 0},
+	{}
+};
+
+static struct spi_driver ad8366_driver = {
+	.driver = {
+		.name	= KBUILD_MODNAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ad8366_probe,
+	.remove		= __devexit_p(ad8366_remove),
+	.id_table	= ad8366_id,
+};
+
+module_spi_driver(ad8366_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD8366 VGA");
+MODULE_LICENSE("GPL v2");
--
1.7.0.4

Re: [PATCH 3/3] iio: amplifiers: New driver for AD8366 Dual-Digital Variable Gain Amplifier

[Greg KH]

On Fri, May 11, 2012 at 11:36:54AM +0200, michael.hennerich@analog.com wrote:
> From: Michael Hennerich <michael.hennerich@analog.com>
> 
> Changes since V1:
> 
> Apply review feedback:
> 	Introduce and use IIO_CHAN_INFO_HARDWAREGAIN
> 	Introduce and use Use IIO_VAL_INT_PLUS_MICRO_DB
> 
> Modify out of staging include paths.
> Convert to new iio core API naming.
> 
> Changes since V2:
> 
> more sanity checking in write_raw
> 
> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
> Acked-by: Jonathan Cameron<jic23@kernel.org>
> ---
>  drivers/iio/Kconfig             |    2 +
>  drivers/iio/Makefile            |    2 +
>  drivers/iio/amplifiers/Kconfig  |   17 +++
>  drivers/iio/amplifiers/Makefile |    5 +
>  drivers/iio/amplifiers/ad8366.c |  222 +++++++++++++++++++++++++++++++++++++++

Woah, the first "real" iio driver?  Congrats!

greg k-h