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  1. 20 Apr, 2012 3 commits
  3. 18 Apr, 2012 34 commits
  5. 13 Apr, 2012 3 commits
    • Ian Abbott's avatar
      staging: comedi: Add kernel config for default buffer sizes · 234bb3c6
      Ian Abbott authored 
      Allow the default values for the module parameters for the default
initial buffer size and default maximum buffer size to be specified in
the kernel configuration.

I'm not sure what the defaults for the defaults for the defaults should
be, but 64 KiB seems to small, so I used values suggested by Bernd Porr,
which are 2048 KiB for the default initial buffer size and 20480 for the
default maximum buffer size.
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Cc: Bernd Porr <berndporr@f2s.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      234bb3c6
    • Ian Abbott's avatar
      staging: comedi: Add module parameters for default buffer size · 4d7df821
      Ian Abbott authored 
      For comedi subdevices that support asynchronous transfer commands, the
initial buffer size and maximum buffer size for the transfer are both
set to 64 KiB when the comedi device is "attached" to the hardware
device.  For many applications with reasonable fast sample rates and
slow user-space (e.g. Python) these sizes are a bit too small.

A task with CAP_SYS_ADMIN privileges can change the maximum buffer size
for a comedi subdevice with an ioctl call or by writing to a device
attribute file in sysfs, but that's not very convenient.  For comedi
devices attached during system startup, this could be done by a start-up
script, but for hot-plugged devices it would require scripts run by udev
rules, etc.

Rather than use hardwired values, this patch introduces a couple of
module parameters to set the defaults for the initial buffer size
(comedi_default_buf_size_kb) and maximum buffer size
(comedi_default_buf_maxsize_kb).  These values are applied in place of
the previous hard-wired values when the comedi device is "attached".
The module parameter values are in units of KiB for consistency with the
existing device attribute files.
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      4d7df821
    • Stefan Roese's avatar
      staging:iio:adc: Add SPEAr ADC driver · b3201b56
      Stefan Roese authored 
      This patch implements the basic single data conversion support for
the SPEAr600 SoC ADC. The register layout of SPEAr600 differs a bit
from other SPEAr SoC variants (e.g. SPEAr3xx). These differences are
handled via DT compatible testing. Resulting in a multi-arch binary.

This driver is currently tested only on SPEAr600. Future patches may add
support for other SoC variants (SPEAr3xx) and features like software
buffer or DMA.
Signed-off-by: default avatarStefan Roese <sr@denx.de>
Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
Acked-by: default avatarViresh Kumar <viresh.kumar@st.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b3201b56
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