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author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2013-08-30 11:08:50 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-17 07:47:41 -0700 |
commit | f6b316bcd8c421acd6fa5a6e18b4c846ecb9d965 (patch) | |
tree | 554c2f90c14e52e1572038105567dd243da0b842 /drivers/staging | |
parent | b2c20d154a296f0d2b4641b5f8369745a811a035 (diff) | |
download | linux-f6b316bcd8c421acd6fa5a6e18b4c846ecb9d965.tar.bz2 |
staging: comedi: ssv_dnp: use comedi_dio_update_state()
Use comedi_dio_update_state() to handle the boilerplate code to update
the subdevice s->state.
Also, fix a bug where the state of the channels is returned in data[0].
The comedi core expects it to be returned in data[1].
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>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/comedi/drivers/ssv_dnp.c | 48 |
1 files changed, 20 insertions, 28 deletions
diff --git a/drivers/staging/comedi/drivers/ssv_dnp.c b/drivers/staging/comedi/drivers/ssv_dnp.c index 11758a515c1b..df22a78d2b7e 100644 --- a/drivers/staging/comedi/drivers/ssv_dnp.c +++ b/drivers/staging/comedi/drivers/ssv_dnp.c @@ -46,51 +46,43 @@ Status: unknown #define PCMR 0xa3 /* Port C Mode Register */ #define PCDR 0xa7 /* Port C Data Register */ -/* ------------------------------------------------------------------------- */ -/* The insn_bits interface allows packed reading/writing of DIO channels. */ -/* The comedi core can convert between insn_bits and insn_read/write, so you */ -/* are able to use these instructions as well. */ -/* ------------------------------------------------------------------------- */ - static int dnp_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { - /* The insn data is a mask in data[0] and the new data in data[1], */ - /* each channel cooresponding to a bit. */ - - /* Ports A and B are straight forward: each bit corresponds to an */ - /* output pin with the same order. Port C is different: bits 0...3 */ - /* correspond to bits 4...7 of the output register (PCDR). */ + unsigned int mask; + unsigned int val; - if (data[0]) { + /* + * Ports A and B are straight forward: each bit corresponds to an + * output pin with the same order. Port C is different: bits 0...3 + * correspond to bits 4...7 of the output register (PCDR). + */ + mask = comedi_dio_update_state(s, data); + if (mask) { outb(PADR, CSCIR); - outb((inb(CSCDR) - & ~(u8) (data[0] & 0x0000FF)) - | (u8) (data[1] & 0x0000FF), CSCDR); + outb(s->state & 0xff, CSCDR); outb(PBDR, CSCIR); - outb((inb(CSCDR) - & ~(u8) ((data[0] & 0x00FF00) >> 8)) - | (u8) ((data[1] & 0x00FF00) >> 8), CSCDR); + outb((s->state >> 8) & 0xff, CSCDR); outb(PCDR, CSCIR); - outb((inb(CSCDR) - & ~(u8) ((data[0] & 0x0F0000) >> 12)) - | (u8) ((data[1] & 0x0F0000) >> 12), CSCDR); + val = inb(CSCDR) & 0x0f; + outb(((s->state >> 12) & 0xf0) | val, CSCDR); } - /* on return, data[1] contains the value of the digital input lines. */ outb(PADR, CSCIR); - data[0] = inb(CSCDR); + val = inb(CSCDR); outb(PBDR, CSCIR); - data[0] += inb(CSCDR) << 8; + val |= (inb(CSCDR) << 8); outb(PCDR, CSCIR); - data[0] += ((inb(CSCDR) & 0xF0) << 12); + val |= ((inb(CSCDR) & 0xf0) << 12); - return insn->n; + data[1] = val; + return insn->n; } static int dnp_dio_insn_config(struct comedi_device *dev, |