Merge tag 'iio-for-4.1b' of...

Merge tag 'iio-for-4.1b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

Second set of new devices, functionality and cleanup for IIO in the 4.1 cycle.

New Functionality
* Watermark logic for buffers.  Allows for blocking reads to block until
  their requested amount is available - previously they only blocked until
  a single scan of data was available.  Also allows for polling for a
  watermark amount of data to be available.  This feature was first proposed
  some time ago to good responses, but not taken further by the original author
  Octavian has picked up the gauntlet and taken it through
  to merging (along with the hardware fifo support that follows).
* New approach to hardware fifo handling - in particular handling the
  interaction of a hardware fifo feeding into a software fifo and their
  watershed events.  We don't have every possible case well covered yet,
  but this is certainly a good, flexible starting point.  This will replace
  the previous approach used in ancient drivers (sca3000) where we just
  exposed the hardware buffer directly to userspace.  Very few pieces of
  hardware have sufficiently long buffers for that to be an adequate solution.
* bmc150_accel - hardware fifo support.
* mlx90614 - support dual IR sensor devices + some refactoring to clean up the
  code and allow some other functionality currently under review.
* L3GD20H gyroscope support added to the st_gyro driver.
* lis3lv02d accelerometer added to the st_gyro driver. Note this part is
  also supported by the older lis3 driver under misc.  A lengthy discussion
  took place and concluded that holding parts out on the basis that whole
  driver would be subsumed into this one was counter productive.  Better
  to add part support and add additional features as people need them.
  Basically there was not advantage in not merging the support.
* max517 driver gains support for MAX520 and MAX521 DACs.

Documentation
* 3.20 -> 4.0 renaming for recent docs. Whilst technically a fix, I think
  people will cope until the next merge merge window.
* An ABI typo hat -> What:  More ABIs should have hats.
* Document in_rot_offset, illuminance_raw and illuminance_scale.

Cleanups
* Fix a scale extraction bug in generic_buffer.c example.
* Constify a load of device tree related structures.

Documentation/ABI/testing/sysfs-bus-iio

@@ -254,6 +254,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_pressureY_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_magn_offset
+What:		/sys/bus/iio/devices/iio:deviceX/in_rot_offset
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -297,6 +298,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_pressureY_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_illuminance_scale
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -337,6 +339,7 @@ what		/sys/bus/iio/devices/iio:deviceX/in_illuminance0_calibscale
 what		/sys/bus/iio/devices/iio:deviceX/in_proximity0_calibscale
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressureY_calibscale
 What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_calibscale
+What:		/sys/bus/iio/devices/iio:deviceX/in_illuminance_calibscale
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -348,7 +351,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender
 What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender
 What:		/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender
 What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Gender of the user (e.g.: male, female) used by some pedometers
@@ -359,7 +362,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender_available
 What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender_available
 What:		/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender_available
 What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender_available
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Lists all available gender values (e.g.: male, female).
@@ -376,7 +379,7 @@ Description:
 		type.
 
 What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibweight
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Weight of the user (in kg). It is needed by some pedometers
@@ -797,7 +800,7 @@ Description:
 
 What:		/sys/.../events/in_accel_x_thresh_rising_period
 What:		/sys/.../events/in_accel_x_thresh_falling_period
-hat:		/sys/.../events/in_accel_x_roc_rising_period
+What:		/sys/.../events/in_accel_x_roc_rising_period
 What:		/sys/.../events/in_accel_x_roc_falling_period
 What:		/sys/.../events/in_accel_y_thresh_rising_period
 What:		/sys/.../events/in_accel_y_thresh_falling_period
@@ -944,7 +947,7 @@ Description:
 		this type.
 
 What:		/sys/.../events/in_steps_change_en
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Event generated when channel passes a threshold on the absolute
@@ -953,7 +956,7 @@ Description:
 		in_steps_change_value.
 
 What:		/sys/.../events/in_steps_change_value
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Specifies the value of change threshold that the
@@ -1128,7 +1131,7 @@ Description:
 
 What:		/sys/.../iio:deviceX/in_energy_input
 What:		/sys/.../iio:deviceX/in_energy_raw
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		This attribute is used to read the energy value reported by the
@@ -1137,7 +1140,7 @@ Description:
 
 What:		/sys/.../iio:deviceX/in_distance_input
 What:		/sys/.../iio:deviceX/in_distance_raw
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		This attribute is used to read the distance covered by the user
@@ -1167,9 +1170,13 @@ Description:
 		values should behave in the same way as a distance, i.e. lower
 		values indicate something is closer to the sensor.
 
+What:		/sys/.../iio:deviceX/in_illuminance_input
+What:		/sys/.../iio:deviceX/in_illuminance_raw
 What:		/sys/.../iio:deviceX/in_illuminanceY_input
 What:		/sys/.../iio:deviceX/in_illuminanceY_raw
 What:		/sys/.../iio:deviceX/in_illuminanceY_mean_raw
+What:		/sys/.../iio:deviceX/in_illuminance_ir_raw
+What:		/sys/.../iio:deviceX/in_illuminance_clear_raw
 KernelVersion:	3.4
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -1198,7 +1205,7 @@ Description:
 		seconds.
 
 What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_integration_time
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Number of seconds in which to compute speed.
@@ -1260,7 +1267,7 @@ Description:
 		Units after application of scale are m/s.
 
 What:		/sys/.../iio:deviceX/in_steps_debounce_count
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Specifies the number of steps that must occur within
@@ -1268,8 +1275,92 @@ Description:
 		consumer is making steps.
 
 What:		/sys/.../iio:deviceX/in_steps_debounce_time
-KernelVersion:	3.20
+KernelVersion:	4.0
 Contact:	linux-iio@vger.kernel.org
 Description:
 		Specifies number of seconds in which we compute the steps
 		that occur in order to decide if the consumer is making steps.
+
+What:		/sys/bus/iio/devices/iio:deviceX/buffer/watermark
+KernelVersion:	4.2
+Contact:	linux-iio@vger.kernel.org
+Description:
+		A single positive integer specifying the maximum number of scan
+		elements to wait for.
+		Poll will block until the watermark is reached.
+		Blocking read will wait until the minimum between the requested
+		read amount or the low water mark is available.
+		Non-blocking read will retrieve the available samples from the
+		buffer even if there are less samples then watermark level. This
+		allows the application to block on poll with a timeout and read
+		the available samples after the timeout expires and thus have a
+		maximum delay guarantee.
+
+What:		/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled
+KernelVersion: 4.2
+Contact:	linux-iio@vger.kernel.org
+Description:
+		A read-only boolean value that indicates if the hardware fifo is
+		currently enabled or disabled. If the device does not have a
+		hardware fifo this entry is not present.
+		The hardware fifo is enabled when the buffer is enabled if the
+		current hardware fifo watermark level is set and other current
+		device settings allows it (e.g. if a trigger is set that samples
+		data differently that the hardware fifo does then hardware fifo
+		will not enabled).
+		If the hardware fifo is enabled and the level of the hardware
+		fifo reaches the hardware fifo watermark level the device will
+		flush its hardware fifo to the device buffer. Doing a non
+		blocking read on the device when no samples are present in the
+		device buffer will also force a flush.
+		When the hardware fifo is enabled there is no need to use a
+		trigger to use buffer mode since the watermark settings
+		guarantees that the hardware fifo is flushed to the device
+		buffer.
+
+What:		/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark
+KernelVersion: 4.2
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Read-only entry that contains a single integer specifying the
+		current watermark level for the hardware fifo. If the device
+		does not have a hardware fifo this entry is not present.
+		The watermark level for the hardware fifo is set by the driver
+		based on the value set by the user in buffer/watermark but
+		taking into account hardware limitations (e.g. most hardware
+		buffers are limited to 32-64 samples, some hardware buffers
+		watermarks are fixed or have minimum levels).  A value of 0
+		means that the hardware watermark is unset.
+
+What:		/sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_min
+KernelVersion: 4.2
+Contact:       linux-iio@vger.kernel.org
+Description:
+		A single positive integer specifying the minimum watermark level
+		for the hardware fifo of this device. If the device does not
+		have a hardware fifo this entry is not present.
+		If the user sets buffer/watermark to a value less than this one,
+		then the hardware watermark will remain unset.
+
+What:	       /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_max
+KernelVersion: 4.2
+Contact:       linux-iio@vger.kernel.org
+Description:
+		A single positive integer specifying the maximum watermark level
+		for the hardware fifo of this device. If the device does not
+		have a hardware fifo this entry is not present.
+		If the user sets buffer/watermark to a value greater than this
+		one, then the hardware watermark will be capped at this value.
+
+What:	       /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_watermark_available
+KernelVersion: 4.2
+Contact:       linux-iio@vger.kernel.org
+Description:
+		A list of positive integers specifying the available watermark
+		levels for the hardware fifo. This entry is optional and if it
+		is not present it means that all the values between
+		hwfifo_watermark_min and hwfifo_watermark_max are supported.
+		If the user sets buffer/watermark to a value greater than
+		hwfifo_watermak_min but not equal to any of the values in this
+		list, the driver will chose an appropriate value for the
+		hardware fifo watermark level.

Documentation/devicetree/bindings/iio/st-sensors.txt

@@ -23,6 +23,7 @@ standard bindings from pinctrl/pinctrl-bindings.txt.
 Valid compatible strings:
 
 Accelerometers:
+- st,lis3lv02dl-accel
 - st,lsm303dlh-accel
 - st,lsm303dlhc-accel
 - st,lis3dh-accel

drivers/iio/accel/st_accel.h

@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/iio/common/st_sensors.h>
 
+#define LIS3LV02DL_ACCEL_DEV_NAME	"lis3lv02dl_accel"
 #define LSM303DLHC_ACCEL_DEV_NAME	"lsm303dlhc_accel"
 #define LIS3DH_ACCEL_DEV_NAME		"lis3dh"
 #define LSM330D_ACCEL_DEV_NAME		"lsm330d_accel"

drivers/iio/accel/st_accel_core.c

@@ -129,6 +129,30 @@
 #define ST_ACCEL_3_IG1_EN_MASK			0x08
 #define ST_ACCEL_3_MULTIREAD_BIT		false
 
+/* CUSTOM VALUES FOR SENSOR 4 */
+#define ST_ACCEL_4_WAI_EXP			0x3a
+#define ST_ACCEL_4_ODR_ADDR			0x20
+#define ST_ACCEL_4_ODR_MASK			0x30 /* DF1 and DF0 */
+#define ST_ACCEL_4_ODR_AVL_40HZ_VAL		0x00
+#define ST_ACCEL_4_ODR_AVL_160HZ_VAL		0x01
+#define ST_ACCEL_4_ODR_AVL_640HZ_VAL		0x02
+#define ST_ACCEL_4_ODR_AVL_2560HZ_VAL		0x03
+#define ST_ACCEL_4_PW_ADDR			0x20
+#define ST_ACCEL_4_PW_MASK			0xc0
+#define ST_ACCEL_4_FS_ADDR			0x21
+#define ST_ACCEL_4_FS_MASK			0x80
+#define ST_ACCEL_4_FS_AVL_2_VAL			0X00
+#define ST_ACCEL_4_FS_AVL_6_VAL			0X01
+#define ST_ACCEL_4_FS_AVL_2_GAIN		IIO_G_TO_M_S_2(1024)
+#define ST_ACCEL_4_FS_AVL_6_GAIN		IIO_G_TO_M_S_2(340)
+#define ST_ACCEL_4_BDU_ADDR			0x21
+#define ST_ACCEL_4_BDU_MASK			0x40
+#define ST_ACCEL_4_DRDY_IRQ_ADDR		0x21
+#define ST_ACCEL_4_DRDY_IRQ_INT1_MASK		0x04
+#define ST_ACCEL_4_IG1_EN_ADDR			0x21
+#define ST_ACCEL_4_IG1_EN_MASK			0x08
+#define ST_ACCEL_4_MULTIREAD_BIT		true
+
 static const struct iio_chan_spec st_accel_12bit_channels[] = {
 	ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
@@ -373,6 +397,63 @@ static const struct st_sensor_settings st_accel_sensors_settings[] = {
 		.multi_read_bit = ST_ACCEL_3_MULTIREAD_BIT,
 		.bootime = 2,
 	},
+	{
+		.wai = ST_ACCEL_4_WAI_EXP,
+		.sensors_supported = {
+			[0] = LIS3LV02DL_ACCEL_DEV_NAME,
+		},
+		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
+		.odr = {
+			.addr = ST_ACCEL_4_ODR_ADDR,
+			.mask = ST_ACCEL_4_ODR_MASK,
+			.odr_avl = {
+				{ 40, ST_ACCEL_4_ODR_AVL_40HZ_VAL },
+				{ 160, ST_ACCEL_4_ODR_AVL_160HZ_VAL, },
+				{ 640, ST_ACCEL_4_ODR_AVL_640HZ_VAL, },
+				{ 2560, ST_ACCEL_4_ODR_AVL_2560HZ_VAL, },
+			},
+		},
+		.pw = {
+			.addr = ST_ACCEL_4_PW_ADDR,
+			.mask = ST_ACCEL_4_PW_MASK,
+			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
+			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+		},
+		.enable_axis = {
+			.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
+			.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
+		},
+		.fs = {
+			.addr = ST_ACCEL_4_FS_ADDR,
+			.mask = ST_ACCEL_4_FS_MASK,
+			.fs_avl = {
+				[0] = {
+					.num = ST_ACCEL_FS_AVL_2G,
+					.value = ST_ACCEL_4_FS_AVL_2_VAL,
+					.gain = ST_ACCEL_4_FS_AVL_2_GAIN,
+				},
+				[1] = {
+					.num = ST_ACCEL_FS_AVL_6G,
+					.value = ST_ACCEL_4_FS_AVL_6_VAL,
+					.gain = ST_ACCEL_4_FS_AVL_6_GAIN,
+				},
+			},
+		},
+		.bdu = {
+			.addr = ST_ACCEL_4_BDU_ADDR,
+			.mask = ST_ACCEL_4_BDU_MASK,
+		},
+		.drdy_irq = {
+			.addr = ST_ACCEL_4_DRDY_IRQ_ADDR,
+			.mask_int1 = ST_ACCEL_4_DRDY_IRQ_INT1_MASK,
+			.ig1 = {
+				.en_addr = ST_ACCEL_4_IG1_EN_ADDR,
+				.en_mask = ST_ACCEL_4_IG1_EN_MASK,
+			},
+		},
+		.multi_read_bit = ST_ACCEL_4_MULTIREAD_BIT,
+		.bootime = 2, /* guess */
+	},
 };
 
 static int st_accel_read_raw(struct iio_dev *indio_dev,

drivers/iio/accel/st_accel_i2c.c

@@ -20,6 +20,10 @@
 
 #ifdef CONFIG_OF
 static const struct of_device_id st_accel_of_match[] = {
+	{
+		.compatible = "st,lis3lv02dl-accel",
+		.data = LIS3LV02DL_ACCEL_DEV_NAME,
+	},
 	{
 		.compatible = "st,lsm303dlh-accel",
 		.data = LSM303DLH_ACCEL_DEV_NAME,

drivers/iio/common/ssp_sensors/ssp_dev.c

@@ -437,7 +437,7 @@ int ssp_queue_ssp_refresh_task(struct ssp_data *data, unsigned int delay)
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id ssp_of_match[] = {
+static const struct of_device_id ssp_of_match[] = {
 	{
 		.compatible	= "samsung,sensorhub-rinato",
 		.data		= &ssp_rinato_info,

drivers/iio/dac/Kconfig

@@ -143,11 +143,16 @@ config AD7303
 	  ad7303.
 
 config MAX517
-	tristate "Maxim MAX517/518/519 DAC driver"
+	tristate "Maxim MAX517/518/519/520/521 DAC driver"
 	depends on I2C
 	help
-	  If you say yes here you get support for the Maxim chips MAX517,
-	  MAX518 and MAX519 (I2C 8-Bit DACs with rail-to-rail outputs).
+	  If you say yes here you get support for the following Maxim chips
+	  (I2C 8-Bit DACs with rail-to-rail outputs):
+	  MAX517 - Single channel, single reference
+	  MAX518 - Dual channel, ref=Vdd
+	  MAX519 - Dual channel, dual reference
+	  MAX520 - Quad channel, quad reference
+	  MAX521 - Octal channel, independent ref for ch0-3, shared ref for ch4-7
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called max517.

drivers/iio/dac/max517.c

@@ -39,11 +39,13 @@ enum max517_device_ids {
 	ID_MAX517,
 	ID_MAX518,
 	ID_MAX519,
+	ID_MAX520,
+	ID_MAX521,
 };
 
 struct max517_data {
 	struct i2c_client	*client;
-	unsigned short		vref_mv[2];
+	unsigned short		vref_mv[8];
 };
 
 /*
@@ -149,7 +151,13 @@ static const struct iio_info max517_info = {
 
 static const struct iio_chan_spec max517_channels[] = {
 	MAX517_CHANNEL(0),
-	MAX517_CHANNEL(1)
+	MAX517_CHANNEL(1),
+	MAX517_CHANNEL(2),
+	MAX517_CHANNEL(3),
+	MAX517_CHANNEL(4),
+	MAX517_CHANNEL(5),
+	MAX517_CHANNEL(6),
+	MAX517_CHANNEL(7),
 };
 
 static int max517_probe(struct i2c_client *client,
@@ -158,6 +166,7 @@ static int max517_probe(struct i2c_client *client,
 	struct max517_data *data;
 	struct iio_dev *indio_dev;
 	struct max517_platform_data *platform_data = client->dev.platform_data;
+	int chan;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
@@ -169,11 +178,21 @@ static int max517_probe(struct i2c_client *client,
 	/* establish that the iio_dev is a child of the i2c device */
 	indio_dev->dev.parent = &client->dev;
 
-	/* reduced channel set for MAX517 */
-	if (id->driver_data == ID_MAX517)
-		indio_dev->num_channels = 1;
-	else
+	switch (id->driver_data) {
+	case ID_MAX521:
+		indio_dev->num_channels = 8;
+		break;
+	case ID_MAX520:
+		indio_dev->num_channels = 4;
+		break;
+	case ID_MAX519:
+	case ID_MAX518:
 		indio_dev->num_channels = 2;
+		break;
+	default:  /* single channel for MAX517 */
+		indio_dev->num_channels = 1;
+		break;
+	}
 	indio_dev->channels = max517_channels;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &max517_info;
@@ -182,11 +201,11 @@ static int max517_probe(struct i2c_client *client,
 	 * Reference voltage on MAX518 and default is 5V, else take vref_mv
 	 * from platform_data
 	 */
-	if (id->driver_data == ID_MAX518 || !platform_data) {
-		data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */
-	} else {
-		data->vref_mv[0] = platform_data->vref_mv[0];
-		data->vref_mv[1] = platform_data->vref_mv[1];
+	for (chan = 0; chan < indio_dev->num_channels; chan++) {
+		if (id->driver_data == ID_MAX518 || !platform_data)
+			data->vref_mv[chan] = 5000; /* mV */
+		else
+			data->vref_mv[chan] = platform_data->vref_mv[chan];
 	}
 
 	return iio_device_register(indio_dev);
@@ -202,6 +221,8 @@ static const struct i2c_device_id max517_id[] = {
 	{ "max517", ID_MAX517 },
 	{ "max518", ID_MAX518 },
 	{ "max519", ID_MAX519 },
+	{ "max520", ID_MAX520 },
+	{ "max521", ID_MAX521 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max517_id);
@@ -218,5 +239,5 @@ static struct i2c_driver max517_driver = {
 module_i2c_driver(max517_driver);
 
 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
-MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC");
+MODULE_DESCRIPTION("MAX517/518/519/520/521 8-bit DAC");
 MODULE_LICENSE("GPL");

drivers/iio/gyro/st_gyro_core.c

@@ -87,6 +87,31 @@
 #define ST_GYRO_2_DRDY_IRQ_INT2_MASK		0x08
 #define ST_GYRO_2_MULTIREAD_BIT			true
 
+/* CUSTOM VALUES FOR SENSOR 3 */
+#define ST_GYRO_3_WAI_EXP			0xd7
+#define ST_GYRO_3_ODR_ADDR			0x20
+#define ST_GYRO_3_ODR_MASK			0xc0
+#define ST_GYRO_3_ODR_AVL_95HZ_VAL		0x00
+#define ST_GYRO_3_ODR_AVL_190HZ_VAL		0x01
+#define ST_GYRO_3_ODR_AVL_380HZ_VAL		0x02
+#define ST_GYRO_3_ODR_AVL_760HZ_VAL		0x03
+#define ST_GYRO_3_PW_ADDR			0x20
+#define ST_GYRO_3_PW_MASK			0x08
+#define ST_GYRO_3_FS_ADDR			0x23
+#define ST_GYRO_3_FS_MASK			0x30
+#define ST_GYRO_3_FS_AVL_250_VAL		0x00
+#define ST_GYRO_3_FS_AVL_500_VAL		0x01
+#define ST_GYRO_3_FS_AVL_2000_VAL		0x02
+#define ST_GYRO_3_FS_AVL_250_GAIN		IIO_DEGREE_TO_RAD(8750)
+#define ST_GYRO_3_FS_AVL_500_GAIN		IIO_DEGREE_TO_RAD(17500)
+#define ST_GYRO_3_FS_AVL_2000_GAIN		IIO_DEGREE_TO_RAD(70000)
+#define ST_GYRO_3_BDU_ADDR			0x23
+#define ST_GYRO_3_BDU_MASK			0x80
+#define ST_GYRO_3_DRDY_IRQ_ADDR			0x22
+#define ST_GYRO_3_DRDY_IRQ_INT2_MASK		0x08
+#define ST_GYRO_3_MULTIREAD_BIT			true
+
+
 static const struct iio_chan_spec st_gyro_16bit_channels[] = {
 	ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL,
 			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
@@ -225,6 +250,64 @@ static const struct st_sensor_settings st_gyro_sensors_settings[] = {
 		.multi_read_bit = ST_GYRO_2_MULTIREAD_BIT,
 		.bootime = 2,
 	},
+	{
+		.wai = ST_GYRO_3_WAI_EXP,
+		.sensors_supported = {
+			[0] = L3GD20_GYRO_DEV_NAME,
+		},
+		.ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
+		.odr = {
+			.addr = ST_GYRO_3_ODR_ADDR,
+			.mask = ST_GYRO_3_ODR_MASK,
+			.odr_avl = {
+				{ 95, ST_GYRO_3_ODR_AVL_95HZ_VAL, },
+				{ 190, ST_GYRO_3_ODR_AVL_190HZ_VAL, },
+				{ 380, ST_GYRO_3_ODR_AVL_380HZ_VAL, },
+				{ 760, ST_GYRO_3_ODR_AVL_760HZ_VAL, },
+			},
+		},
+		.pw = {
+			.addr = ST_GYRO_3_PW_ADDR,
+			.mask = ST_GYRO_3_PW_MASK,
+			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
+			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+		},
+		.enable_axis = {
+			.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
+			.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
+		},
+		.fs = {
+			.addr = ST_GYRO_3_FS_ADDR,
+			.mask = ST_GYRO_3_FS_MASK,
+			.fs_avl = {
+				[0] = {
+					.num = ST_GYRO_FS_AVL_250DPS,
+					.value = ST_GYRO_3_FS_AVL_250_VAL,
+					.gain = ST_GYRO_3_FS_AVL_250_GAIN,
+				},
+				[1] = {
+					.num = ST_GYRO_FS_AVL_500DPS,
+					.value = ST_GYRO_3_FS_AVL_500_VAL,
+					.gain = ST_GYRO_3_FS_AVL_500_GAIN,
+				},
+				[2] = {
+					.num = ST_GYRO_FS_AVL_2000DPS,
+					.value = ST_GYRO_3_FS_AVL_2000_VAL,
+					.gain = ST_GYRO_3_FS_AVL_2000_GAIN,
+				},
+			},
+		},
+		.bdu = {
+			.addr = ST_GYRO_3_BDU_ADDR,
+			.mask = ST_GYRO_3_BDU_MASK,
+		},
+		.drdy_irq = {
+			.addr = ST_GYRO_3_DRDY_IRQ_ADDR,
+			.mask_int2 = ST_GYRO_3_DRDY_IRQ_INT2_MASK,
+		},
+		.multi_read_bit = ST_GYRO_3_MULTIREAD_BIT,
+		.bootime = 2,
+	},
 };
 
 static int st_gyro_read_raw(struct iio_dev *indio_dev,

drivers/iio/industrialio-buffer.c

@@ -37,11 +37,57 @@ static bool iio_buffer_is_active(struct iio_buffer *buf)
 	return !list_empty(&buf->buffer_list);
 }
 
-static bool iio_buffer_data_available(struct iio_buffer *buf)
+static size_t iio_buffer_data_available(struct iio_buffer *buf)
 {
 	return buf->access->data_available(buf);
 }
 
+static int iio_buffer_flush_hwfifo(struct iio_dev *indio_dev,
+				   struct iio_buffer *buf, size_t required)
+{
+	if (!indio_dev->info->hwfifo_flush_to_buffer)
+		return -ENODEV;
+
+	return indio_dev->info->hwfifo_flush_to_buffer(indio_dev, required);
+}
+
+static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
+			     size_t to_wait, int to_flush)
+{
+	size_t avail;
+	int flushed = 0;
+
+	/* wakeup if the device was unregistered */
+	if (!indio_dev->info)
+		return true;
+
+	/* drain the buffer if it was disabled */
+	if (!iio_buffer_is_active(buf)) {
+		to_wait = min_t(size_t, to_wait, 1);
+		to_flush = 0;
+	}
+
+	avail = iio_buffer_data_available(buf);
+
+	if (avail >= to_wait) {
+		/* force a flush for non-blocking reads */
+		if (!to_wait && !avail && to_flush)
+			iio_buffer_flush_hwfifo(indio_dev, buf, to_flush);
+		return true;
+	}
+
+	if (to_flush)
+		flushed = iio_buffer_flush_hwfifo(indio_dev, buf,
+						  to_wait - avail);
+	if (flushed <= 0)
+		return false;
+
+	if (avail + flushed >= to_wait)
+		return true;
+
+	return false;
+}
+
 /**
  * iio_buffer_read_first_n_outer() - chrdev read for buffer access
  *
@@ -53,6 +99,9 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
 {
 	struct iio_dev *indio_dev = filp->private_data;
 	struct iio_buffer *rb = indio_dev->buffer;
+	size_t datum_size;
+	size_t to_wait = 0;
+	size_t to_read;
 	int ret;
 
 	if (!indio_dev->info)
@@ -61,19 +110,28 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
 	if (!rb || !rb->access->read_first_n)
 		return -EINVAL;
 
+	datum_size = rb->bytes_per_datum;
+
+	/*
+	 * If datum_size is 0 there will never be anything to read from the
+	 * buffer, so signal end of file now.
+	 */
+	if (!datum_size)
+		return 0;
+
+	to_read = min_t(size_t, n / datum_size, rb->watermark);
+
+	if (!(filp->f_flags & O_NONBLOCK))
+		to_wait = to_read;
+
 	do {
-		if (!iio_buffer_data_available(rb)) {
-			if (filp->f_flags & O_NONBLOCK)
-				return -EAGAIN;
+		ret = wait_event_interruptible(rb->pollq,
+			iio_buffer_ready(indio_dev, rb, to_wait, to_read));
+		if (ret)
+			return ret;
 
-			ret = wait_event_interruptible(rb->pollq,
-					iio_buffer_data_available(rb) ||
-					indio_dev->info == NULL);
-			if (ret)
-				return ret;
-			if (indio_dev->info == NULL)
-				return -ENODEV;
-		}
+		if (!indio_dev->info)
+			return -ENODEV;
 
 		ret = rb->access->read_first_n(rb, n, buf);
 		if (ret == 0 && (filp->f_flags & O_NONBLOCK))
@@ -96,9 +154,8 @@ unsigned int iio_buffer_poll(struct file *filp,
 		return -ENODEV;
 
 	poll_wait(filp, &rb->pollq, wait);
-	if (iio_buffer_data_available(rb))
+	if (iio_buffer_ready(indio_dev, rb, rb->watermark, 0))
 		return POLLIN | POLLRDNORM;
-	/* need a way of knowing if there may be enough data... */
 	return 0;
 }
 
@@ -123,6 +180,7 @@ void iio_buffer_init(struct iio_buffer *buffer)
 	INIT_LIST_HEAD(&buffer->buffer_list);
 	init_waitqueue_head(&buffer->pollq);
 	kref_init(&buffer->ref);
+	buffer->watermark = 1;
 }
 EXPORT_SYMBOL(iio_buffer_init);
 
@@ -416,6 +474,11 @@ static ssize_t iio_buffer_write_length(struct device *dev,
 		buffer->access->set_length(buffer, val);
 		ret = 0;
 	}
+	if (ret)
+		goto out;
+	if (buffer->length && buffer->length < buffer->watermark)
+		buffer->watermark = buffer->length;
+out:
 	mutex_unlock(&indio_dev->mlock);
 
 	return ret ? ret : len;
@@ -472,6 +535,7 @@ static void iio_buffer_activate(struct iio_dev *indio_dev,
 static void iio_buffer_deactivate(struct iio_buffer *buffer)
 {
 	list_del_init(&buffer->buffer_list);
+	wake_up_interruptible(&buffer->pollq);
 	iio_buffer_put(buffer);
 }
 
@@ -629,19 +693,16 @@ static int __iio_update_buffers(struct iio_dev *indio_dev,
 		}
 	}
 	/* Definitely possible for devices to support both of these. */
-	if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) {
-		if (!indio_dev->trig) {
-			printk(KERN_INFO "Buffer not started: no trigger\n");
-			ret = -EINVAL;
-			/* Can only occur on first buffer */
-			goto error_run_postdisable;
-		}
+	if ((indio_dev->modes & INDIO_BUFFER_TRIGGERED) && indio_dev->trig) {
 		indio_dev->currentmode = INDIO_BUFFER_TRIGGERED;
 	} else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) {
 		indio_dev->currentmode = INDIO_BUFFER_HARDWARE;
 	} else if (indio_dev->modes & INDIO_BUFFER_SOFTWARE) {
 		indio_dev->currentmode = INDIO_BUFFER_SOFTWARE;
 	} else { /* Should never be reached */
+		/* Can only occur on first buffer */
+		if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
+			pr_info("Buffer not started: no trigger\n");
 		ret = -EINVAL;
 		goto error_run_postdisable;
 	}
@@ -754,16 +815,67 @@ static ssize_t iio_buffer_store_enable(struct device *dev,
 
 static const char * const iio_scan_elements_group_name = "scan_elements";
 
+static ssize_t iio_buffer_show_watermark(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct iio_buffer *buffer = indio_dev->buffer;
+
+	return sprintf(buf, "%u\n", buffer->watermark);
+}
+
+static ssize_t iio_buffer_store_watermark(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf,
+					  size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct iio_buffer *buffer = indio_dev->buffer;
+	unsigned int val;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &val);
+	if (ret)
+		return ret;
+	if (!val)
+		return -EINVAL;
+
+	mutex_lock(&indio_dev->mlock);
+
+	if (val > buffer->length) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (iio_buffer_is_active(indio_dev->buffer)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	buffer->watermark = val;
+
+	if (indio_dev->info->hwfifo_set_watermark)
+		indio_dev->info->hwfifo_set_watermark(indio_dev, val);
+out:
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret ? ret : len;
+}
+
 static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,
 		   iio_buffer_write_length);
 static struct device_attribute dev_attr_length_ro = __ATTR(length,
 	S_IRUGO, iio_buffer_read_length, NULL);
 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR,
 		   iio_buffer_show_enable, iio_buffer_store_enable);
+static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR,
+		   iio_buffer_show_watermark, iio_buffer_store_watermark);
 
 static struct attribute *iio_buffer_attrs[] = {
 	&dev_attr_length.attr,
 	&dev_attr_enable.attr,
+	&dev_attr_watermark.attr,
 };
 
 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
@@ -944,8 +1056,18 @@ static const void *iio_demux(struct iio_buffer *buffer,
 static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data)
 {
 	const void *dataout = iio_demux(buffer, data);
+	int ret;
 
-	return buffer->access->store_to(buffer, dataout);
+	ret = buffer->access->store_to(buffer, dataout);
+	if (ret)
+		return ret;
+
+	/*
+	 * We can't just test for watermark to decide if we wake the poll queue
+	 * because read may request less samples than the watermark.
+	 */
+	wake_up_interruptible_poll(&buffer->pollq, POLLIN | POLLRDNORM);
+	return 0;
 }
 
 static void iio_buffer_demux_free(struct iio_buffer *buffer)

drivers/iio/kfifo_buf.c

@@ -83,9 +83,6 @@ static int iio_store_to_kfifo(struct iio_buffer *r,
 	ret = kfifo_in(&kf->kf, data, 1);
 	if (ret != 1)
 		return -EBUSY;
-
-	wake_up_interruptible_poll(&r->pollq, POLLIN | POLLRDNORM);
-
 	return 0;
 }
 
@@ -109,16 +106,16 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r,
 	return copied;
 }
 
-static bool iio_kfifo_buf_data_available(struct iio_buffer *r)
+static size_t iio_kfifo_buf_data_available(struct iio_buffer *r)
 {
 	struct iio_kfifo *kf = iio_to_kfifo(r);
-	bool empty;
+	size_t samples;
 
 	mutex_lock(&kf->user_lock);
-	empty = kfifo_is_empty(&kf->kf);
+	samples = kfifo_len(&kf->kf);
 	mutex_unlock(&kf->user_lock);
 
-	return !empty;
+	return samples;
 }
 
 static void iio_kfifo_buffer_release(struct iio_buffer *buffer)

drivers/iio/temperature/mlx90614.c

@@ -2,6 +2,7 @@
  * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
  *
  * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ * Copyright (c) 2015 Essensium NV
  *
  * This file is subject to the terms and conditions of version 2 of
  * the GNU General Public License.  See the file COPYING in the main
@@ -20,11 +21,35 @@
 
 #include <linux/iio/iio.h>
 
-#define MLX90614_OP_RAM 0x00
+#define MLX90614_OP_RAM		0x00
+#define MLX90614_OP_EEPROM	0x20
+#define MLX90614_OP_SLEEP	0xff
 
 /* RAM offsets with 16-bit data, MSB first */
+#define MLX90614_RAW1	(MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */
+#define MLX90614_RAW2	(MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */
 #define MLX90614_TA	(MLX90614_OP_RAM | 0x06) /* ambient temperature */
 #define MLX90614_TOBJ1	(MLX90614_OP_RAM | 0x07) /* object 1 temperature */
+#define MLX90614_TOBJ2	(MLX90614_OP_RAM | 0x08) /* object 2 temperature */
+
+/* EEPROM offsets with 16-bit data, MSB first */
+#define MLX90614_EMISSIVITY	(MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */
+#define MLX90614_CONFIG		(MLX90614_OP_EEPROM | 0x05) /* configuration register */
+
+/* Control bits in configuration register */
+#define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
+#define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
+#define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
+#define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
+#define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
+#define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
+#define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */
+#define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT)
+
+/* Timings (in ms) */
+#define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
+#define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
+#define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
 
 struct mlx90614_data {
 	struct i2c_client *client;
@@ -35,26 +60,34 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev,
 			    int *val2, long mask)
 {
 	struct mlx90614_data *data = iio_priv(indio_dev);
+	u8 cmd;
 	s32 ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
 		switch (channel->channel2) {
 		case IIO_MOD_TEMP_AMBIENT:
-			ret = i2c_smbus_read_word_data(data->client,
-			    MLX90614_TA);
-			if (ret < 0)
-				return ret;
+			cmd = MLX90614_TA;
 			break;
 		case IIO_MOD_TEMP_OBJECT:
-			ret = i2c_smbus_read_word_data(data->client,
-			    MLX90614_TOBJ1);
-			if (ret < 0)
-				return ret;
+			switch (channel->channel) {
+			case 0:
+				cmd = MLX90614_TOBJ1;
+				break;
+			case 1:
+				cmd = MLX90614_TOBJ2;
+				break;
+			default:
+				return -EINVAL;
+			}
 			break;
 		default:
 			return -EINVAL;
 		}
+
+		ret = i2c_smbus_read_word_data(data->client, cmd);
+		if (ret < 0)
+			return ret;
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_OFFSET:
@@ -86,6 +119,16 @@ static const struct iio_chan_spec mlx90614_channels[] = {
 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 		    BIT(IIO_CHAN_INFO_SCALE),
 	},
+	{
+		.type = IIO_TEMP,
+		.indexed = 1,
+		.modified = 1,
+		.channel = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		    BIT(IIO_CHAN_INFO_SCALE),
+	},
 };
 
 static const struct iio_info mlx90614_info = {
@@ -93,11 +136,25 @@ static const struct iio_info mlx90614_info = {
 	.driver_module = THIS_MODULE,
 };
 
+/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
+static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
+{
+	s32 ret;
+
+	ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
+
+	if (ret < 0)
+		return ret;
+
+	return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
+}
+
 static int mlx90614_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct iio_dev *indio_dev;
 	struct mlx90614_data *data;
+	int ret;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 		return -ENODEV;
@@ -115,8 +172,21 @@ static int mlx90614_probe(struct i2c_client *client,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &mlx90614_info;
 
-	indio_dev->channels = mlx90614_channels;
-	indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels);
+	ret = mlx90614_probe_num_ir_sensors(client);
+	switch (ret) {
+	case 0:
+		dev_dbg(&client->dev, "Found single sensor");
+		indio_dev->channels = mlx90614_channels;
+		indio_dev->num_channels = 2;
+		break;
+	case 1:
+		dev_dbg(&client->dev, "Found dual sensor");
+		indio_dev->channels = mlx90614_channels;
+		indio_dev->num_channels = 3;
+		break;
+	default:
+		return ret;
+	}
 
 	return iio_device_register(indio_dev);
 }
@@ -146,5 +216,6 @@ static struct i2c_driver mlx90614_driver = {
 module_i2c_driver(mlx90614_driver);
 
 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
 MODULE_LICENSE("GPL");

drivers/staging/iio/accel/sca3000_ring.c

@@ -129,9 +129,9 @@ static int sca3000_read_first_n_hw_rb(struct iio_buffer *r,
 	return ret ? ret : num_read;
 }
 
-static bool sca3000_ring_buf_data_available(struct iio_buffer *r)
+static size_t sca3000_ring_buf_data_available(struct iio_buffer *r)
 {
-	return r->stufftoread;
+	return r->stufftoread ? r->watermark : 0;
 }
 
 /**

include/linux/iio/buffer.h

@@ -21,8 +21,8 @@ struct iio_buffer;
  * struct iio_buffer_access_funcs - access functions for buffers.
  * @store_to:		actually store stuff to the buffer
  * @read_first_n:	try to get a specified number of bytes (must exist)
- * @data_available:	indicates whether data for reading from the buffer is
- *			available.
+ * @data_available:	indicates how much data is available for reading from
+ *			the buffer.
  * @request_update:	if a parameter change has been marked, update underlying
  *			storage.
  * @set_bytes_per_datum:set number of bytes per datum
@@ -43,7 +43,7 @@ struct iio_buffer_access_funcs {
 	int (*read_first_n)(struct iio_buffer *buffer,
 			    size_t n,
 			    char __user *buf);
-	bool (*data_available)(struct iio_buffer *buffer);
+	size_t (*data_available)(struct iio_buffer *buffer);
 
 	int (*request_update)(struct iio_buffer *buffer);
 
@@ -72,6 +72,7 @@ struct iio_buffer_access_funcs {
  * @demux_bounce:	[INTERN] buffer for doing gather from incoming scan.
  * @buffer_list:	[INTERN] entry in the devices list of current buffers.
  * @ref:		[INTERN] reference count of the buffer.
+ * @watermark:		[INTERN] number of datums to wait for poll/read.
  */
 struct iio_buffer {
 	int					length;
@@ -90,6 +91,7 @@ struct iio_buffer {
 	void					*demux_bounce;
 	struct list_head			buffer_list;
 	struct kref				ref;
+	unsigned int				watermark;
 };
 
 /**

include/linux/iio/dac/max517.h

@@ -9,7 +9,7 @@
 #define IIO_DAC_MAX517_H_
 
 struct max517_platform_data {
-	u16				vref_mv[2];
+	u16				vref_mv[8];
 };
 
 #endif /* IIO_DAC_MAX517_H_ */

include/linux/iio/iio.h

@@ -338,6 +338,16 @@ struct iio_dev;
  *			provide a custom of_xlate function that reads the
  *			*args* and returns the appropriate index in registered
  *			IIO channels array.
+ * @hwfifo_set_watermark: function pointer to set the current hardware
+ *			fifo watermark level; see hwfifo_* entries in
+ *			Documentation/ABI/testing/sysfs-bus-iio for details on
+ *			how the hardware fifo operates
+ * @hwfifo_flush_to_buffer: function pointer to flush the samples stored
+ *			in the hardware fifo to the device buffer. The driver
+ *			should not flush more than count samples. The function
+ *			must return the number of samples flushed, 0 if no
+ *			samples were flushed or a negative integer if no samples
+ *			were flushed and there was an error.
  **/
 struct iio_info {
 	struct module			*driver_module;
@@ -399,6 +409,9 @@ struct iio_info {
 				  unsigned *readval);
 	int (*of_xlate)(struct iio_dev *indio_dev,
 			const struct of_phandle_args *iiospec);
+	int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val);
+	int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev,
+				      unsigned count);
 };
 
 /**

tools/iio/iio_utils.c

@@ -20,6 +20,11 @@
 
 const char *iio_dir = "/sys/bus/iio/devices/";
 
+static char * const iio_direction[] = {
+	"in",
+	"out",
+};
+
 /**
  * iioutils_break_up_name() - extract generic name from full channel name
  * @full_name: the full channel name
@@ -30,10 +35,19 @@ int iioutils_break_up_name(const char *full_name,
 {
 	char *current;
 	char *w, *r;
-	char *working;
+	char *working, *prefix = "";
+	int i;
 
-	current = strdup(full_name);
+	for (i = 0; i < sizeof(iio_direction) / sizeof(iio_direction[0]); i++)
+		if (!strncmp(full_name, iio_direction[i],
+			     strlen(iio_direction[i]))) {
+			prefix = iio_direction[i];
+			break;
+		}
+
+	current = strdup(full_name + strlen(prefix) + 1);
 	working = strtok(current, "_\0");
+
 	w = working;
 	r = working;
 
@@ -45,7 +59,7 @@ int iioutils_break_up_name(const char *full_name,
 		r++;
 	}
 	*w = '\0';
-	*generic_name = strdup(working);
+	asprintf(generic_name, "%s_%s", prefix, working);
 	free(current);
 
 	return 0;