diff options
| -rw-r--r-- | drivers/staging/comedi/comedidev.h | 2 | ||||
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 22 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h index 2e19f659cd22..1d8e61a822fd 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); +unsigned int comedi_dio_update_state(struct comedi_subdevice *, + 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 aeef59492ba2..8f02bf66e20b 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -190,6 +190,28 @@ int comedi_dio_insn_config(struct comedi_device *dev, } EXPORT_SYMBOL_GPL(comedi_dio_insn_config); +/** + * comedi_dio_update_state() - update the internal state of DIO subdevices. + * @s: comedi_subdevice struct + * @data: the channel mask and bits to update + */ +unsigned int comedi_dio_update_state(struct comedi_subdevice *s, + unsigned int *data) +{ + unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) + : 0xffffffff; + unsigned int mask = data[0] & chanmask; + unsigned int bits = data[1]; + + if (mask) { + s->state &= ~mask; + s->state |= (bits & mask); + } + + return mask; +} +EXPORT_SYMBOL_GPL(comedi_dio_update_state); + static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) |