drivers/staging/iio/Documentation/sysfs-class-iio

What:		/sys/bus/iio/devices/device[n]
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Hardware chip or device accessed by on communication port.
		Corresponds to a grouping of sensor channels.

What:		/sys/bus/iio/devices/trigger[n]
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		An event driven driver of data capture to an in kernel buffer.
		May be provided by a device driver that also has an IIO device
		based on hardware generated events (e.g. data ready) or
		provided by a separate driver for other hardware (e.g.
		periodic timer, gpio or high resolution timer).
		Contains trigger type specific elements. These do not
		generalize well and hence are not documented in this file.

What:		/sys/bus/iio/devices/device[n]:buffer
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
	        Link to /sys/class/iio/device[n]/device[n]:buffer. n indicates the
		device with which this buffer buffer is associated.

What:		/sys/.../device[n]/name
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Description of the physical chip / device. Typically a part
		number.

What:		/sys/.../device[n]/sampling_frequency
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Some devices have internal clocks.  This parameter sets the
		resulting sampling frequency.  In many devices this
		parameter has an effect on input filters etc rather than
		simply controlling when the input is sampled.  As this
		effects datardy triggers, hardware buffers and the sysfs
		direct access interfaces, it may be found in any of the
		relevant directories.  If it effects all of the above
		then it is to be found in the base device directory as here.

What:		/sys/.../device[n]/sampling_frequency_available
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		When the internal sampling clock can only take a small
		discrete set of values, this file lists those availale.

What:		/sys/.../device[n]/in[_name][m]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Raw (unscaled no bias removal etc) voltage measurement from
		channel m. name is used in special cases where this does
		not correspond to externally available input (e.g. supply
		voltage monitoring in which case the file is in_supply_raw).

What:		/sys/.../device[n]/in[_name][m]_offset
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		If known for a device, offset to be added to in[m]_raw prior
		to scaling by in[_name][m]_scale in order to obtain voltage in
		millivolts.  Not present if the offset is always 0 or unknown.
		If m is not present, then voltage offset applies to all in
		channels. May be writable if a variable offset is controlled
		by the device. Note that this is different to calibbias which
		is for devices that apply offsets to compensate for variation
		between different instances of the part, typically adjusted by
		using some hardware supported calibration procedure.

What:		/sys/.../device[n]/in[_name][m]_offset_available
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		If a small number of discrete offset values are available, this
		will be a space separated list.  If these are independant (but
		options the same) for individual offsets then m should not be
		present.

What:		/sys/.../device[n]/in[_name][m]_offset_[min|max]
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		If a more or less continuous range of voltage offsets are supported
		then these specify the minimum and maximum.  If shared by all
		in channels then m is not present.

What:		/sys/.../device[n]/in[_name][m]_calibbias
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Hardware applied calibration offset. (assumed to fix production
		inaccuracies)

What		/sys/.../device[n]/in[_name][m]_calibscale
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Hardware applied calibration scale factor. (assumed to fix production
		inaccuracies)

What:		/sys/.../device[n]/in[_name][m]_scale
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		If known for a device, scale to be applied to volt[m]_raw post
		addition of in[_name][m]_offset in order to obtain the measured
		voltage	in millivolts.  If shared across all in channels then			m is not present.

What:		/sys/.../device[n]/in[m]-in[o]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Raw (unscaled) differential voltage measurement equivalent to
		channel m - channel o where these channel numbers apply to the physically
		equivalent inputs when non differential readings are separately available.
		In differential only parts, then all that is required is a consistent
		labelling.

What:		/sys/.../device[n]/accel[_x|_y|_z][m]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Acceleration in direction x, y or z (may be arbitrarily assigned
		but should match other such assignments on device)
		channel m (not present if only one accelerometer channel at
		this orientation). Has all of the equivalent parameters as per in[m].
		Units after application of scale and offset are m/s^2.

What:		/sys/.../device[n]/gyro[_x|_y|_z][m]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Angular velocity about axis x, y or z (may be arbitrarily assigned)
		channel m (not present if only one gyroscope at this orientation).
		Data converted by application of offset then scale to
		radians per second. Has all the equivalent parameters as per in[m].

What:		/sys/.../device[n]/incli[_x|_y|_z][m]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Inclination raw reading about axis x, y or z (may be arbitarily
		assigned) channel m (not present if only one inclinometer at
		this orientation).  Data converted by application of offset
		and scale to Degrees.

What:		/sys/.../device[n]/magn[_x|_y|_z][m]_raw
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Magnetic field along axis x, y or z (may be arbitrarily assigned)
		channel m (not present if only one magnetometer at this orientation).
		Data converted by application of offset then scale to Gauss
		Has all the equivalent modifiers as per in[m].

What:		/sys/.../device[n]/device[n]:event[m]
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Configuration of which hardware generated events are passed up to
		userspace. Some of these are a bit complex to generalize so this
		section is a work in progress.

What:		/sys/.../device[n]:event[m]/dev
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		major:minor character device numbers for the event line.

Taking accel_x0 as an example

What:		/sys/.../device[n]:event[m]/accel_x0_thresh[_high|_low]_en
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Event generated when accel_x0 passes a threshold in correction direction
		(or stays beyond one). If direction isn't specified, either triggers it.
		Note driver will assume last p events requested are enabled where p is
		however many it supports.  So if you want to be sure you have
		set what you think you have, check the contents of these. Drivers
		may have to buffer any parameters so that they are consistent when a
		given event type is enabled a future point (and not those for whatever
		alarm was previously enabled).

What:		/sys/.../device[n]:event[m]/accel_x0_roc[_high|_low]_en
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Same as above but based on the first differential of the value.


What:		/sys/.../device[n]:event[m]/accel_x0[_thresh|_roc][_high|_low]_period
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		A period of time (microsecs) for which the condition must be broken
		before an interrupt is triggered. Applies to all alarms if type is not
		specified.

What:		/sys/.../device[n]:event[m]/accel_x0[_thresh|_roc][_high|_low]_value
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		The actual value of the threshold in raw device units obtained by
		 reverse application of scale and offfset to the acceleration in m/s^2.

What:		/sys/.../device[n]/scan_elements
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Directory containing interfaces for elements that will be captured
		for a single triggered sample set in the buffer.

What:		/sys/.../device[n]/scan_elements/[m]_accel_x0_en
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Scan element control for triggered data capture. m implies the
		ordering within the buffer. Next the type is specified with
		modifier and channel number as per the sysfs single channel
		access above.

What:		/sys/.../device[n]/scan_elements/accel[_x0]_precision
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Scan element precision within the buffer. Note that the
		data alignment must restrictions must be read from within
		buffer to work out full data alignment for data read
		via buffer_access chrdev. _x0 dropped if shared across all
		acceleration channels.

What:		/sys/.../device[n]/scan_elements/accel[_x0]_shift
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		A bit shift (to right) that must be applied prior to
		extracting the bits specified by accel[_x0]_precision.

What:		/sys/.../device[n]/device[n]:buffer:event/dev
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Buffer for device n event character device major:minor numbers.

What:		/sys/.../device[n]/device[n]:buffer:access/dev
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Buffer for device n access character device o major:minor numbers.

What:		/sys/.../device[n]:buffer/trigger
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		The name of the trigger source being used, as per string given
		in /sys/class/iio/trigger[n]/name.

What:		/sys/.../device[n]:buffer/length
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Number of scans contained by the buffer.

What:		/sys/.../device[n]:buffer/bps
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Bytes per scan.  Due to alignment fun, the scan may be larger
		than implied directly by the scan_element parameters.

What:		/sys/.../device[n]:buffer/enable
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Actually start the buffer capture up.  Will start trigger
		if first device and appropriate.

What:		/sys/.../device[n]:buffer/alignment
KernelVersion:	2.6.35
Contact:	linux-iio@vger.kernel.org
Description:
		Minimum data alignment.  Scan elements larger than this are aligned
		to the nearest power of 2 times this.  (may not be true in weird
		hardware buffers that pack data well)