Merge tag 'iio-for-3.10b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

	Second round of IIO cleanups for the 3.10 cycle

	1) A nice little removal of the unwanted private pointer from
	   struct iio_trigger.
	2) Some clean up of the ad799x driver.
	3) Couple of cleanups for the exynos_adc driver and some documentation.
	4) Move the mxs-lradc initialization a little earlier in the driver to avoid
	   wiping out the configuration just after setting it.

	A nice small set of worthy bits and bobs.

21 files changed, 120 insertions, 405 deletions

diff --git a/drivers/iio/accel/st_accel_buffer.c b/drivers/iio/accel/st_accel_buffer.c
index 6bd82c7f769c..d9b350756f90 100644
--- a/drivers/iio/accel/st_accel_buffer.c
+++ b/drivers/iio/accel/st_accel_buffer.c
@@ -25,7 +25,7 @@
 
 int st_accel_trig_set_state(struct iio_trigger *trig, bool state)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 
 	return st_sensors_set_dataready_irq(indio_dev, state);
 }
diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index afe6d78c8ff0..f0d6335ae087 100644
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -470,7 +470,7 @@ static int ad_sd_probe_trigger(struct iio_dev *indio_dev)
 		disable_irq_nosync(sigma_delta->spi->irq);
 	}
 	sigma_delta->trig->dev.parent = &sigma_delta->spi->dev;
-	sigma_delta->trig->private_data = sigma_delta;
+	iio_trigger_set_drvdata(sigma_delta->trig, sigma_delta);
 
 	ret = iio_trigger_register(sigma_delta->trig);
 	if (ret)
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 92eb6a5b9e72..6fc43c15f028 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -188,7 +188,7 @@ static u8 at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
 
 static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
 {
-	struct iio_dev *idev = trig->private_data;
+	struct iio_dev *idev = iio_trigger_get_drvdata(trig);
 	struct at91_adc_state *st = iio_priv(idev);
 	struct iio_buffer *buffer = idev->buffer;
 	struct at91_adc_reg_desc *reg = st->registers;
@@ -254,7 +254,7 @@ static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev,
 		return NULL;
 
 	trig->dev.parent = idev->dev.parent;
-	trig->private_data = idev;
+	iio_trigger_set_drvdata(trig, idev);
 	trig->ops = &at91_adc_trigger_ops;
 
 	ret = iio_trigger_register(trig);
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 4a8a9a34228f..9f3a8ef1fb3e 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -440,7 +440,7 @@ static struct platform_driver exynos_adc_driver = {
 	.driver		= {
 		.name	= "exynos-adc",
 		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(exynos_adc_match),
+		.of_match_table = exynos_adc_match,
 		.pm	= &exynos_adc_pm_ops,
 	},
 };
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
index 7a525a91105d..87419c41b991 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -31,7 +31,7 @@
 static int hid_sensor_data_rdy_trigger_set_state(struct iio_trigger *trig,
 						bool state)
 {
-	struct hid_sensor_common *st = trig->private_data;
+	struct hid_sensor_common *st = iio_trigger_get_drvdata(trig);
 	int state_val;
 
 	state_val = state ? 1 : 0;
@@ -76,7 +76,7 @@ int hid_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
 	}
 
 	trig->dev.parent = indio_dev->dev.parent;
-	trig->private_data = attrb;
+	iio_trigger_set_drvdata(trig, attrb);
 	trig->ops = &hid_sensor_trigger_ops;
 	ret = iio_trigger_register(trig);
 
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
index 139ed030abb0..8fc3a97eb266 100644
--- a/drivers/iio/common/st_sensors/st_sensors_trigger.c
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -40,7 +40,7 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
 	if (err)
 		goto request_irq_error;
 
-	sdata->trig->private_data = indio_dev;
+	iio_trigger_set_drvdata(sdata->trig, indio_dev);
 	sdata->trig->ops = trigger_ops;
 	sdata->trig->dev.parent = sdata->dev;
 
diff --git a/drivers/iio/gyro/itg3200_buffer.c b/drivers/iio/gyro/itg3200_buffer.c
index f667d2c8c00f..6c43af9bb0a4 100644
--- a/drivers/iio/gyro/itg3200_buffer.c
+++ b/drivers/iio/gyro/itg3200_buffer.c
@@ -81,7 +81,7 @@ void itg3200_buffer_unconfigure(struct iio_dev *indio_dev)
 static int itg3200_data_rdy_trigger_set_state(struct iio_trigger *trig,
 		bool state)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	int ret;
 	u8 msc;
 
@@ -129,7 +129,7 @@ int itg3200_probe_trigger(struct iio_dev *indio_dev)
 
 	st->trig->dev.parent = &st->i2c->dev;
 	st->trig->ops = &itg3200_trigger_ops;
-	st->trig->private_data = indio_dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
 	ret = iio_trigger_register(st->trig);
 	if (ret)
 		goto error_free_irq;
diff --git a/drivers/iio/gyro/st_gyro_buffer.c b/drivers/iio/gyro/st_gyro_buffer.c
index da4d122ec7dc..69017c7ec302 100644
--- a/drivers/iio/gyro/st_gyro_buffer.c
+++ b/drivers/iio/gyro/st_gyro_buffer.c
@@ -25,7 +25,7 @@
 
 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 
 	return st_sensors_set_dataready_irq(indio_dev, state);
 }
diff --git a/drivers/iio/imu/adis_trigger.c b/drivers/iio/imu/adis_trigger.c
index 5a24c9cac343..e0017c22bb9c 100644
--- a/drivers/iio/imu/adis_trigger.c
+++ b/drivers/iio/imu/adis_trigger.c
@@ -19,7 +19,7 @@
 static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
 						bool state)
 {
-	struct adis *adis = trig->private_data;
+	struct adis *adis = iio_trigger_get_drvdata(trig);
 
 	return adis_enable_irq(adis, state);
 }
@@ -57,7 +57,7 @@ int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
 
 	adis->trig->dev.parent = &adis->spi->dev;
 	adis->trig->ops = &adis_trigger_ops;
-	adis->trig->private_data = adis;
+	iio_trigger_set_drvdata(adis->trig, adis);
 	ret = iio_trigger_register(adis->trig);
 
 	indio_dev->trig = adis->trig;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
index e1d0869e0ad1..03b9372c1212 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
@@ -103,7 +103,7 @@ static int inv_mpu6050_set_enable(struct iio_dev *indio_dev, bool enable)
 static int inv_mpu_data_rdy_trigger_set_state(struct iio_trigger *trig,
 						bool state)
 {
-	return inv_mpu6050_set_enable(trig->private_data, state);
+	return inv_mpu6050_set_enable(iio_trigger_get_drvdata(trig), state);
 }
 
 static const struct iio_trigger_ops inv_mpu_trigger_ops = {
@@ -130,8 +130,8 @@ int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev)
 	if (ret)
 		goto error_free_trig;
 	st->trig->dev.parent = &st->client->dev;
-	st->trig->private_data = indio_dev;
 	st->trig->ops = &inv_mpu_trigger_ops;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
 	ret = iio_trigger_register(st->trig);
 	if (ret)
 		goto error_free_irq;
diff --git a/drivers/staging/iio/Documentation/trigger.txt b/drivers/staging/iio/Documentation/trigger.txt
index 75cc37ff1ed0..64e2e08fb4d0 100644
--- a/drivers/staging/iio/Documentation/trigger.txt
+++ b/drivers/staging/iio/Documentation/trigger.txt
@@ -10,9 +10,6 @@ struct iio_trig *trig = iio_trigger_alloc("<trigger format string>", ...);
 allocates a trigger structure.  The key elements to then fill in within
 a driver are:
 
-trig->private_data
-	Device specific private data.
-
 trig->owner
 	Typically set to THIS_MODULE. Used to ensure correct
 	ownership of core allocated resources.
diff --git a/drivers/staging/iio/accel/lis3l02dq_ring.c b/drivers/staging/iio/accel/lis3l02dq_ring.c
index e676403ea3ea..5b8f0f6c9938 100644
--- a/drivers/staging/iio/accel/lis3l02dq_ring.c
+++ b/drivers/staging/iio/accel/lis3l02dq_ring.c
@@ -228,7 +228,7 @@ error_ret:
 static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig,
 						bool state)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	int ret = 0;
 	u8 t;
 
@@ -252,7 +252,7 @@ static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig,
  */
 static int lis3l02dq_trig_try_reen(struct iio_trigger *trig)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	struct lis3l02dq_state *st = iio_priv(indio_dev);
 	int i;
 
@@ -290,7 +290,7 @@ int lis3l02dq_probe_trigger(struct iio_dev *indio_dev)
 
 	st->trig->dev.parent = &st->us->dev;
 	st->trig->ops = &lis3l02dq_trigger_ops;
-	st->trig->private_data = indio_dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
 	ret = iio_trigger_register(st->trig);
 	if (ret)
 		goto error_free_trig;
diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
index 3e363c4ba211..b51680c1c331 100644
--- a/drivers/staging/iio/adc/ad799x.h
+++ b/drivers/staging/iio/adc/ad799x.h
@@ -87,7 +87,6 @@ struct ad799x_state;
  * struct ad799x_chip_info - chip specifc information
  * @channel:		channel specification
  * @num_channels:	number of channels
- * @int_vref_mv:	the internal reference voltage
  * @monitor_mode:	whether the chip supports monitor interrupts
  * @default_config:	device default configuration
  * @event_attrs:	pointer to the monitor event attribute group
@@ -96,7 +95,6 @@ struct ad799x_state;
 struct ad799x_chip_info {
 	struct iio_chan_spec		channel[9];
 	int				num_channels;
-	u16				int_vref_mv;
 	u16				default_config;
 	const struct iio_info		*info;
 };
@@ -104,12 +102,13 @@ struct ad799x_chip_info {
 struct ad799x_state {
 	struct i2c_client		*client;
 	const struct ad799x_chip_info	*chip_info;
-	struct iio_trigger		*trig;
 	struct regulator		*reg;
 	u16				int_vref_mv;
 	unsigned			id;
-	char				*name;
 	u16				config;
+
+	u8				*rx_buf;
+	unsigned int			transfer_size;
 };
 
 /*
diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
index 40cc89abe3c3..8dc97b36e05a 100644
--- a/drivers/staging/iio/adc/ad799x_core.c
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -48,13 +48,13 @@ static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
 	struct i2c_client *client = st->client;
 	int ret = 0;
 
-	ret = i2c_smbus_read_word_data(client, reg);
+	ret = i2c_smbus_read_word_swapped(client, reg);
 	if (ret < 0) {
 		dev_err(&client->dev, "I2C read error\n");
 		return ret;
 	}
 
-	*data = swab16((u16)ret);
+	*data = (u16)ret;
 
 	return 0;
 }
@@ -80,7 +80,7 @@ static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
 	struct i2c_client *client = st->client;
 	int ret = 0;
 
-	ret = i2c_smbus_write_word_data(client, reg, swab16(data));
+	ret = i2c_smbus_write_word_swapped(client, reg, data);
 	if (ret < 0)
 		dev_err(&client->dev, "I2C write error\n");
 
@@ -104,6 +104,13 @@ static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
 {
 	struct ad799x_state *st = iio_priv(indio_dev);
 
+	kfree(st->rx_buf);
+	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+	if (!st->rx_buf)
+		return -ENOMEM;
+
+	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
+
 	switch (st->id) {
 	case ad7997:
 	case ad7998:
@@ -460,395 +467,114 @@ static const struct iio_info ad7993_4_7_8_info = {
 #define AD799X_EV_MASK (IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | \
 			IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING))
 
+#define AD799X_CHANNEL(_index, _realbits, _evmask) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.channel = (_index), \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.scan_index = (_index), \
+	.scan_type = IIO_ST('u', _realbits, 16, 12 - (_realbits)), \
+	.event_mask = (_evmask), \
+}
+
 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 	[ad7991] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
+			AD799X_CHANNEL(0, 12, 0),
+			AD799X_CHANNEL(1, 12, 0),
+			AD799X_CHANNEL(2, 12, 0),
+			AD799X_CHANNEL(3, 12, 0),
+			IIO_CHAN_SOFT_TIMESTAMP(4),
 		},
 		.num_channels = 5,
-		.int_vref_mv = 4096,
 		.info = &ad7991_info,
 	},
 	[ad7995] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
+			AD799X_CHANNEL(0, 10, 0),
+			AD799X_CHANNEL(1, 10, 0),
+			AD799X_CHANNEL(2, 10, 0),
+			AD799X_CHANNEL(3, 10, 0),
+			IIO_CHAN_SOFT_TIMESTAMP(4),
 		},
 		.num_channels = 5,
-		.int_vref_mv = 1024,
 		.info = &ad7991_info,
 	},
 	[ad7999] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 8, 16, 4),
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 8, 16, 4),
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 8, 16, 4),
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 8, 16, 4),
-			},
-			[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
+			AD799X_CHANNEL(0, 8, 0),
+			AD799X_CHANNEL(1, 8, 0),
+			AD799X_CHANNEL(2, 8, 0),
+			AD799X_CHANNEL(3, 8, 0),
+			IIO_CHAN_SOFT_TIMESTAMP(4),
 		},
 		.num_channels = 5,
-		.int_vref_mv = 1024,
 		.info = &ad7991_info,
 	},
 	[ad7992] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
+			AD799X_CHANNEL(0, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(1, 12, AD799X_EV_MASK),
+			IIO_CHAN_SOFT_TIMESTAMP(3),
 		},
 		.num_channels = 3,
-		.int_vref_mv = 4096,
 		.default_config = AD7998_ALERT_EN,
 		.info = &ad7992_info,
 	},
 	[ad7993] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.scan_index = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
+			AD799X_CHANNEL(0, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(1, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(2, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(3, 10, AD799X_EV_MASK),
+			IIO_CHAN_SOFT_TIMESTAMP(4),
 		},
 		.num_channels = 5,
-		.int_vref_mv = 1024,
 		.default_config = AD7998_ALERT_EN,
 		.info = &ad7993_4_7_8_info,
 	},
 	[ad7994] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
+			AD799X_CHANNEL(0, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(1, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(2, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(3, 12, AD799X_EV_MASK),
+			IIO_CHAN_SOFT_TIMESTAMP(4),
 		},
 		.num_channels = 5,
-		.int_vref_mv = 4096,
 		.default_config = AD7998_ALERT_EN,
 		.info = &ad7993_4_7_8_info,
 	},
 	[ad7997] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[4] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 4,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 4,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[5] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 5,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 5,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[6] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 6,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 6,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[7] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 7,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 7,
-				.scan_type = IIO_ST('u', 10, 16, 2),
-			},
-			[8] = IIO_CHAN_SOFT_TIMESTAMP(8),
+			AD799X_CHANNEL(0, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(1, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(2, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(3, 10, AD799X_EV_MASK),
+			AD799X_CHANNEL(4, 10, 0),
+			AD799X_CHANNEL(5, 10, 0),
+			AD799X_CHANNEL(6, 10, 0),
+			AD799X_CHANNEL(7, 10, 0),
+			IIO_CHAN_SOFT_TIMESTAMP(8),
 		},
 		.num_channels = 9,
-		.int_vref_mv = 1024,
 		.default_config = AD7998_ALERT_EN,
 		.info = &ad7993_4_7_8_info,
 	},
 	[ad7998] = {
 		.channel = {
-			[0] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 0,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 0,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[1] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 1,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 1,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[2] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 2,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 2,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[3] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 3,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 3,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-				.event_mask = AD799X_EV_MASK,
-			},
-			[4] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 4,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 4,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[5] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 5,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 5,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[6] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 6,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 6,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[7] = {
-				.type = IIO_VOLTAGE,
-				.indexed = 1,
-				.channel = 7,
-				.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-				.scan_index = 7,
-				.scan_type = IIO_ST('u', 12, 16, 0),
-			},
-			[8] = IIO_CHAN_SOFT_TIMESTAMP(8),
+			AD799X_CHANNEL(0, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(1, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(2, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(3, 12, AD799X_EV_MASK),
+			AD799X_CHANNEL(4, 12, 0),
+			AD799X_CHANNEL(5, 12, 0),
+			AD799X_CHANNEL(6, 12, 0),
+			AD799X_CHANNEL(7, 12, 0),
+			IIO_CHAN_SOFT_TIMESTAMP(8),
 		},
 		.num_channels = 9,
-		.int_vref_mv = 4096,
 		.default_config = AD7998_ALERT_EN,
 		.info = &ad7993_4_7_8_info,
 	},
@@ -875,10 +601,10 @@ static int ad799x_probe(struct i2c_client *client,
 
 	/* TODO: Add pdata options for filtering and bit delay */
 
-	if (pdata)
-		st->int_vref_mv = pdata->vref_mv;
-	else
-		st->int_vref_mv = st->chip_info->int_vref_mv;
+	if (!pdata)
+		return -EINVAL;
+
+	st->int_vref_mv = pdata->vref_mv;
 
 	st->reg = regulator_get(&client->dev, "vcc");
 	if (!IS_ERR(st->reg)) {
@@ -946,6 +672,7 @@ static int ad799x_remove(struct i2c_client *client)
 		regulator_disable(st->reg);
 		regulator_put(st->reg);
 	}
+	kfree(st->rx_buf);
 	iio_device_free(indio_dev);
 
 	return 0;
diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c
index 2c5f38475a8e..c2ebae12ee19 100644
--- a/drivers/staging/iio/adc/ad799x_ring.c
+++ b/drivers/staging/iio/adc/ad799x_ring.c
@@ -36,14 +36,9 @@ static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct ad799x_state *st = iio_priv(indio_dev);
 	s64 time_ns;
-	__u8 *rxbuf;
 	int b_sent;
 	u8 cmd;
 
-	rxbuf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
-	if (rxbuf == NULL)
-		goto out;
-
 	switch (st->id) {
 	case ad7991:
 	case ad7995:
@@ -66,20 +61,17 @@ static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 	}
 
 	b_sent = i2c_smbus_read_i2c_block_data(st->client,
-			cmd, bitmap_weight(indio_dev->active_scan_mask,
-					   indio_dev->masklength) * 2, rxbuf);
+			cmd, st->transfer_size, st->rx_buf);
 	if (b_sent < 0)
-		goto done;
+		goto out;
 
 	time_ns = iio_get_time_ns();
 
 	if (indio_dev->scan_timestamp)
-		memcpy(rxbuf + indio_dev->scan_bytes - sizeof(s64),
+		memcpy(st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
 			&time_ns, sizeof(time_ns));
 
-	iio_push_to_buffers(indio_dev, rxbuf);
-done:
-	kfree(rxbuf);
+	iio_push_to_buffers(indio_dev, st->rx_buf);
 out:
 	iio_trigger_notify_done(indio_dev->trig);
 
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 25a4359a92db..6044e1717b20 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -646,7 +646,7 @@ static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
 
 static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
 {
-	struct iio_dev *iio = trig->private_data;
+	struct iio_dev *iio = iio_trigger_get_drvdata(trig);
 	struct mxs_lradc *lradc = iio_priv(iio);
 	const uint32_t st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
 
@@ -670,7 +670,7 @@ static int mxs_lradc_trigger_init(struct iio_dev *iio)
 		return -ENOMEM;
 
 	trig->dev.parent = iio->dev.parent;
-	trig->private_data = iio;
+	iio_trigger_set_drvdata(trig, iio);
 	trig->ops = &mxs_lradc_trigger_ops;
 
 	ret = iio_trigger_register(trig);
@@ -983,6 +983,9 @@ static int mxs_lradc_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_trig;
 
+	/* Configure the hardware. */
+	mxs_lradc_hw_init(lradc);
+
 	/* Register the touchscreen input device. */
 	ret = mxs_lradc_ts_register(lradc);
 	if (ret)
@@ -995,9 +998,6 @@ static int mxs_lradc_probe(struct platform_device *pdev)
 		goto err_ts;
 	}
 
-	/* Configure the hardware. */
-	mxs_lradc_hw_init(lradc);
-
 	return 0;
 
 err_ts:
diff --git a/drivers/staging/iio/meter/ade7758_trigger.c b/drivers/staging/iio/meter/ade7758_trigger.c
index f9c6a340092b..7a94ddd42f59 100644
--- a/drivers/staging/iio/meter/ade7758_trigger.c
+++ b/drivers/staging/iio/meter/ade7758_trigger.c
@@ -32,7 +32,7 @@ static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private)
 static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig,
 						bool state)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 
 	dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
 	return ade7758_set_irq(&indio_dev->dev, state);
@@ -44,7 +44,7 @@ static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig,
  **/
 static int ade7758_trig_try_reen(struct iio_trigger *trig)
 {
-	struct iio_dev *indio_dev = trig->private_data;
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	struct ade7758_state *st = iio_priv(indio_dev);
 
 	enable_irq(st->us->irq);
@@ -81,7 +81,7 @@ int ade7758_probe_trigger(struct iio_dev *indio_dev)
 
 	st->trig->dev.parent = &st->us->dev;
 	st->trig->ops = &ade7758_trigger_ops;
-	st->trig->private_data = indio_dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
 	ret = iio_trigger_register(st->trig);
 
 	/* select default trigger */
diff --git a/drivers/staging/iio/trigger/iio-trig-bfin-timer.c b/drivers/staging/iio/trigger/iio-trig-bfin-timer.c
index 42798da575c0..38a158b77b1d 100644
--- a/drivers/staging/iio/trigger/iio-trig-bfin-timer.c
+++ b/drivers/staging/iio/trigger/iio-trig-bfin-timer.c
@@ -65,7 +65,7 @@ struct bfin_tmr_state {
 
 static int iio_bfin_tmr_set_state(struct iio_trigger *trig, bool state)
 {
-	struct bfin_tmr_state *st = trig->private_data;
+	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
 
 	if (get_gptimer_period(st->t->id) == 0)
 		return -EINVAL;
@@ -82,7 +82,7 @@ static ssize_t iio_bfin_tmr_frequency_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct bfin_tmr_state *st = trig->private_data;
+	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
 	unsigned long val;
 	bool enabled;
 	int ret;
@@ -125,7 +125,7 @@ static ssize_t iio_bfin_tmr_frequency_show(struct device *dev,
 				 char *buf)
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct bfin_tmr_state *st = trig->private_data;
+	struct bfin_tmr_state *st = iio_trigger_get_drvdata(trig);
 	unsigned int period = get_gptimer_period(st->t->id);
 	unsigned long val;
 
@@ -213,9 +213,9 @@ static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
 		goto out1;
 	}
 
-	st->trig->private_data = st;
 	st->trig->ops = &iio_bfin_tmr_trigger_ops;
 	st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups;
+	iio_trigger_set_drvdata(st->trig, st);
 	ret = iio_trigger_register(st->trig);
 	if (ret)
 		goto out2;
diff --git a/drivers/staging/iio/trigger/iio-trig-gpio.c b/drivers/staging/iio/trigger/iio-trig-gpio.c
index fcc4cb048c9a..7c593d18a910 100644
--- a/drivers/staging/iio/trigger/iio-trig-gpio.c
+++ b/drivers/staging/iio/trigger/iio-trig-gpio.c
@@ -83,7 +83,7 @@ static int iio_gpio_trigger_probe(struct platform_device *pdev)
 				ret = -ENOMEM;
 				goto error_put_trigger;
 			}
-			trig->private_data = trig_info;
+			iio_trigger_set_drvdata(trig, trig_info);
 			trig_info->irq = irq;
 			trig->ops = &iio_gpio_trigger_ops;
 			ret = request_irq(irq, iio_gpio_trigger_poll,
@@ -121,7 +121,7 @@ error_free_completed_registrations:
 				 trig2,
 				 &iio_gpio_trigger_list,
 				 alloc_list) {
-		trig_info = trig->private_data;
+		trig_info = iio_trigger_get_drvdata(trig);
 		free_irq(gpio_to_irq(trig_info->irq), trig);
 		kfree(trig_info);
 		iio_trigger_unregister(trig);
@@ -140,7 +140,7 @@ static int iio_gpio_trigger_remove(struct platform_device *pdev)
 				 trig2,
 				 &iio_gpio_trigger_list,
 				 alloc_list) {
-		trig_info = trig->private_data;
+		trig_info = iio_trigger_get_drvdata(trig);
 		iio_trigger_unregister(trig);
 		free_irq(trig_info->irq, trig);
 		kfree(trig_info);
diff --git a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
index 9102b1ba2530..79695974b1d4 100644
--- a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
+++ b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
@@ -30,7 +30,7 @@ struct iio_prtc_trigger_info {
 
 static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
 {
-	struct iio_prtc_trigger_info *trig_info = trig->private_data;
+	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
 	if (trig_info->frequency == 0)
 		return -EINVAL;
 	printk(KERN_INFO "trigger frequency is %d\n", trig_info->frequency);
@@ -42,7 +42,7 @@ static ssize_t iio_trig_periodic_read_freq(struct device *dev,
 					   char *buf)
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct iio_prtc_trigger_info *trig_info = trig->private_data;
+	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
 	return sprintf(buf, "%u\n", trig_info->frequency);
 }
 
@@ -52,7 +52,7 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev,
 					    size_t len)
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct iio_prtc_trigger_info *trig_info = trig->private_data;
+	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
 	unsigned long val;
 	int ret;
 
@@ -124,7 +124,7 @@ static int iio_trig_periodic_rtc_probe(struct platform_device *dev)
 			ret = -ENOMEM;
 			goto error_put_trigger_and_remove_from_list;
 		}
-		trig->private_data = trig_info;
+		iio_trigger_set_drvdata(trig, trig_info);
 		trig->ops = &iio_prtc_trigger_ops;
 		/* RTC access */
 		trig_info->rtc
@@ -158,7 +158,7 @@ error_free_completed_registrations:
 				 trig2,
 				 &iio_prtc_trigger_list,
 				 alloc_list) {
-		trig_info = trig->private_data;
+		trig_info = iio_trigger_get_drvdata(trig);
 		rtc_irq_unregister(trig_info->rtc, &trig_info->task);
 		rtc_class_close(trig_info->rtc);
 		kfree(trig_info);
@@ -176,7 +176,7 @@ static int iio_trig_periodic_rtc_remove(struct platform_device *dev)
 				 trig2,
 				 &iio_prtc_trigger_list,
 				 alloc_list) {
-		trig_info = trig->private_data;
+		trig_info = iio_trigger_get_drvdata(trig);
 		rtc_irq_unregister(trig_info->rtc, &trig_info->task);
 		rtc_class_close(trig_info->rtc);
 		kfree(trig_info);
diff --git a/drivers/staging/iio/trigger/iio-trig-sysfs.c b/drivers/staging/iio/trigger/iio-trig-sysfs.c
index 3bac97224bf4..b727bde8b7fe 100644
--- a/drivers/staging/iio/trigger/iio-trig-sysfs.c
+++ b/drivers/staging/iio/trigger/iio-trig-sysfs.c
@@ -103,7 +103,7 @@ static ssize_t iio_sysfs_trigger_poll(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
-	struct iio_sysfs_trig *sysfs_trig = trig->private_data;
+	struct iio_sysfs_trig *sysfs_trig = iio_trigger_get_drvdata(trig);
 
 	irq_work_queue(&sysfs_trig->work);
 
@@ -160,7 +160,7 @@ static int iio_sysfs_trigger_probe(int id)
 	t->trig->dev.groups = iio_sysfs_trigger_attr_groups;
 	t->trig->ops = &iio_sysfs_trigger_ops;
 	t->trig->dev.parent = &iio_sysfs_trig_dev;
-	t->trig->private_data = t;
+	iio_trigger_set_drvdata(t->trig, t);
 
 	init_irq_work(&t->work, iio_sysfs_trigger_work);