From 853098b6e5b0f65887853211b8fb6045cb849b8d Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sat, 4 Sep 2010 17:54:51 +0100 Subject: [PATCH] staging: iio: documentation - partial update to make more of it true. Signed-off-by: Jonathan Cameron Acked-by: Manuel Stahl Signed-off-by: Greg Kroah-Hartman --- .../staging/iio/Documentation/overview.txt | 17 +++--- .../{sysfs-class-iio => sysfs-bus-iio} | 0 .../staging/iio/Documentation/userspace.txt | 54 +------------------ 3 files changed, 10 insertions(+), 61 deletions(-) rename drivers/staging/iio/Documentation/{sysfs-class-iio => sysfs-bus-iio} (100%) diff --git a/drivers/staging/iio/Documentation/overview.txt b/drivers/staging/iio/Documentation/overview.txt index cc6ecad4035c..d97106cb2b96 100644 --- a/drivers/staging/iio/Documentation/overview.txt +++ b/drivers/staging/iio/Documentation/overview.txt @@ -1,8 +1,8 @@ Overview of IIO -The Industrial I/O subsytem is intended to provide support for devices -that in some sense are analog to digital convertors (ADCs). As many -actual devices combine some ADCs with digital to analog convertors +The Industrial I/O subsystem is intended to provide support for devices +that in some sense are analog to digital converters (ADCs). As many +actual devices combine some ADCs with digital to analog converters (DACs) the intention is to add that functionality at a future date (hence the name). @@ -46,18 +46,17 @@ external signal (trigger). These triggers might be a data ready signal, a gpio line connected to some external system or an on processor periodic interrupt. A single trigger may initialize data capture or reading from a number of sensors. These triggers are -used in iio to fill software ring buffers acting in a very similar +used in IIO to fill software ring buffers acting in a very similar fashion to the hardware buffers described above. Other documentation: -userspace.txt - overview of ring buffer reading from userspace +userspace.txt - overview of ring buffer reading from userspace. -device.txt - elemennts of a typical device driver. +device.txt - elements of a typical device driver. trigger.txt - elements of a typical trigger driver. -ring.txt - additional elements required for ring buffer support - - +ring.txt - additional elements required for ring buffer support. +sysfs-bus-iio - abi documentation file. diff --git a/drivers/staging/iio/Documentation/sysfs-class-iio b/drivers/staging/iio/Documentation/sysfs-bus-iio similarity index 100% rename from drivers/staging/iio/Documentation/sysfs-class-iio rename to drivers/staging/iio/Documentation/sysfs-bus-iio diff --git a/drivers/staging/iio/Documentation/userspace.txt b/drivers/staging/iio/Documentation/userspace.txt index 8bba2fa3ba07..ff06e5dc7188 100644 --- a/drivers/staging/iio/Documentation/userspace.txt +++ b/drivers/staging/iio/Documentation/userspace.txt @@ -1,62 +1,12 @@ Userspace access to IIO -Example, ST Microelectronics LIS3L02DQ accelerometer. - -Typical sysfs entries (pruned for clarity) - -/sys/class/iio - device0 - iio_dev related elements - name - driver specific identifier (here lis3l02dq) - accel_x_raw - polled (or from ring) raw readout of acceleration - accel_x_offset - offset to be applied to the raw reading - accel_x_scale - scale to be applied to the raw reading and offset - accel_x_calibbias - hardware offset (calibration) - accel_x_calibscale - hardware gain (calibration) - - sampling_frequency_available - what options are there - sampling_frequency - control of internal sampling frequency - device - link to underlying hardware device - uevent - udev related element - - thresh - unified threshold used for detection on all axis - event_line0_sources - which events are enabled - accel_x_high - enable x axis high threshold event - accel_x_low - enable x axis low threshold event - - event_line0 - event interface - dev - major:minor for the chrdev (note major allocation dynamic) - trigger - consumer attachement - current_trigger - name based association with a trigger - device0:buffer0 - ring buffer interface - bytes_per_datum - byptes per complete datum (read only), - dependant on scan element selection - length - (rw) specificy length fo software ring buffer (typically ro in hw case) - enable - turn the ring on. If its the first to be enabled attached to this - trigger will also enable the trigger. - device0:buffer0:access0 - dev - major:minor for ring buffer access chrdev - device0:buffer0:event0 - dev - major:minor for ring buffer event chrdev - scan_elements - controls which channels will be stored in the ring buffer - accel_x_en - accel_y_en - timestamp_en - - trigger0 - data ready trigger elements - name - unqiue name of trigger +The sysfs attributes are documented in sysfs-bus-iio. Udev will create the following entries under /dev by default: device0:buffer0:access0 - ring access chrdev device0:buffer0:event0 - ring event chrdev -event_line0 - general event chrdev. - -For the example code we assume the following rules have been used to ensure -unique and consistent naming of these for the lis3l02dq in question: - -KERNEL="ring_event_line*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_ring_event" -KERNEL="event_line*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_event" -KERNEL="ring_access*", ID="spi1.0", DRIVER="lis3l02dq", NAME="iio/lis3l02dq_ring_access" +device0:event0 - general event chrdev. The files, lis3l02dqbuffersimple.c and iio_utils.h in this directory provide an example of how to use the ring buffer and event interfaces. -- 2.30.2