staging: comedi: addi_apci_3120: remove analog output reset

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The apci3120_reset() function is called at the end of the (*auto_attach) and
with the (*detach) is called to unload the driver. Part of this function
resets all the analog output channels to 0V.

There are two problems with this.
1) Only the APCI-3120 has analog outputs, the APCI-3001 does not.
2) The DA_READY bit in the status register needs to be checked before each
   write to update the analog outputs. It's unknown what the DA_READY bit
   does on the APCI-3001 board.

Just remove the analog output reset to avoid any problems.

Also, remove the unnecessary udelay() in apci3120_reset().

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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H Hartley Sweeten 2014-10-20 11:34:19 -07:00 • committed by Greg Kroah-Hartman

parent ce987a8a8f

commit b9ae204658

1 changed files with 0 additions and 18 deletions

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18

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c

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