e03b29b55f
Some of the hardware registers of the DMM-32-AT board are multiplexed,
using the least significant two bits of the Miscellaneous Control
register to select the function of registers at offsets 12 to 15:
00 => 8254 timer/counter registers are accessible
01 => 8255 digital I/O registers are accessible
10 => Reserved
11 => Calibration registers are accessible
The interrupt service routine (`dmm32at_isr()`) clobbers the bottom two
bits of the register with value 00, which would interfere with access to
the 8255 registers by the `dm32at_8255_io()` function (used for Comedi
instruction handling on the digital I/O subdevice).
Make use of the generic Comedi device spin-lock `dev->spinlock` (which
is otherwise unused by this driver) to serialize access to the
miscellaneous control register and paged registers.
Fixes:
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|---|---|---|
| .. | ||
| drivers | ||
| kcomedilib | ||
| Kconfig | ||
| Makefile | ||
| TODO | ||
| comedi_buf.c | ||
| comedi_fops.c | ||
| comedi_internal.h | ||
| comedi_pci.c | ||
| comedi_pcmcia.c | ||
| comedi_usb.c | ||
| drivers.c | ||
| proc.c | ||
| range.c | ||