The (*insn_bits) functions for DIO and DO subdevices typically use
the subdevice 's->state' to hold the current state of the output
channels. The 'insn' passed to these functions, INSN_BITS, specifies
two parameters passed in the 'data'.
data[0] = 'mask', the channels to update
data[1] = 'bits', the new state for the channels
Introduce a helper function to handle this boilerplate.
The function returns:
0 if there are no changes in the state
1 if the driver needs to update the hardware to a new state
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/comedidev.h | 2 ++
drivers/staging/comedi/drivers.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 2e19f65..de36499 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -345,6 +345,8 @@ void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *data,
unsigned int mask);
+int comedi_dio_insn_bits(struct comedi_device *, struct comedi_subdevice *,
+ struct comedi_insn *, unsigned int *data);
void *comedi_alloc_devpriv(struct comedi_device *, size_t);
int comedi_alloc_subdevices(struct comedi_device *, int);
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index 317a821..2bbd9d0 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -190,6 +190,31 @@ int comedi_dio_insn_config(struct comedi_device *dev,
}
EXPORT_SYMBOL_GPL(comedi_dio_insn_config);
+/**
+ * comedi_dio_insn_bits() - boilerplate (*insn_bits) for DIO and DO subdevices.
+ * @dev: comedi_device struct
+ * @s: comedi_subdevice struct
+ * @insn: comedi_insn struct
+ * @data: parameters for the @insn
+ */
+int comedi_dio_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ unsigned int mask = data[0];
+ unsigned int bits = data[1];
+
+ if (mask) {
+ s->state &= ~mask;
+ s->state |= (bits & mask);
+
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(comedi_dio_insn_bits);
+
static int insn_rw_emulate_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
--
1.8.3.2
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