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staging: comedi: icp_multi: correct insn_bits returned data for DO

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For some unfathomable reason, the Comedi `insn_bits` handler for the
digital output subdevice (`icp_multi_insn_bits_do()`) writes the digital
output register and reads back the unrelated digital input register.
Read back the current state of the outputs (held in `s->state`) instead.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2014-10-31 14:32:27 +00:00 committed by Greg Kroah-Hartman
parent c234566f77
commit cf5d2af683
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/comedi/drivers/icp_multi.c
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@ -53,7 +53,7 @@ Configuration options: not applicable, uses PCI auto config
#define ICP_MULTI_AI 2 /* R: Analogue input data */
#define ICP_MULTI_DAC_CSR 4 /* R/W: DAC command/status register */
#define ICP_MULTI_AO 6 /* R/W: Analogue output data */
#define ICP_MULTI_DI 8 /* R/W: Digital inouts */
#define ICP_MULTI_DI 8 /* R/W: Digital inputs */
#define ICP_MULTI_DO 0x0A /* R/W: Digital outputs */
#define ICP_MULTI_INT_EN 0x0C /* R/W: Interrupt enable register */
#define ICP_MULTI_INT_STAT 0x0E /* R/W: Interrupt status register */
@ -319,7 +319,7 @@ static int icp_multi_insn_bits_do(struct comedi_device *dev,
if (comedi_dio_update_state(s, data))
writew(s->state, dev->mmio + ICP_MULTI_DO);
data[1] = readw(dev->mmio + ICP_MULTI_DI);
data[1] = s->state;
return insn->n;
}