staging: comedi: das16: all supported board have digital inputs

All the boards supported by this driver have digital inputs and all
of then use the same function to handle the (*insn_bits) for the
subdevice.

Remove the 'di' member from the boardinfo and always initialize the
digital input subdevice during the board attach.

Tidy up the subdevice init a bit as well as the (*insn_bits) function.
The (*insn_bits) function does not need to clear data[0].

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>

1 files changed, 12 insertions, 41 deletions

diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index 11e5787..3528c82 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -343,7 +343,6 @@ struct das16_board {
 	unsigned int ai_pg;
 	void *ao;
 	unsigned int ao_nbits;
-	void *di;
 	void *do_;
 
 	unsigned int i8255_offset;
@@ -712,14 +711,12 @@ static int das16_ai_insn_read(struct comedi_device *dev,
 	return n;
 }
 
-static int das16_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
-			  struct comedi_insn *insn, unsigned int *data)
+static int das16_di_insn_bits(struct comedi_device *dev,
+			      struct comedi_subdevice *s,
+			      struct comedi_insn *insn,
+			      unsigned int *data)
 {
-	unsigned int bits;
-
-	bits = inb(dev->iobase + DAS16_DIO) & 0xf;
-	data[1] = bits;
-	data[0] = 0;
+	data[1] = inb(dev->iobase + DAS16_DIO) & 0xf;
 
 	return insn->n;
 }
@@ -1149,18 +1146,14 @@ static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		s->type = COMEDI_SUBD_UNUSED;
 	}
 
+	/* Digital Input subdevice */
 	s = &dev->subdevices[2];
-	/* di */
-	if (board->di) {
-		s->type = COMEDI_SUBD_DI;
-		s->subdev_flags = SDF_READABLE;
-		s->n_chan = 4;
-		s->maxdata = 1;
-		s->range_table = &range_digital;
-		s->insn_bits = board->di;
-	} else {
-		s->type = COMEDI_SUBD_UNUSED;
-	}
+	s->type		= COMEDI_SUBD_DI;
+	s->subdev_flags	= SDF_READABLE;
+	s->n_chan	= 4;
+	s->maxdata	= 1;
+	s->range_table	= &range_digital;
+	s->insn_bits	= das16_di_insn_bits;
 
 	s = &dev->subdevices[3];
 	/* do */
@@ -1234,7 +1227,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_none,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x10,
 		.i8254_offset	= 0x0c,
@@ -1247,7 +1239,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_none,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x10,
 		.i8254_offset	= 0x0c,
@@ -1260,7 +1251,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_none,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x10,
 		.i8254_offset	= 0x0c,
@@ -1273,7 +1263,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_none,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x10,
 		.i8254_offset	= 0x0c,
@@ -1286,7 +1275,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_none,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x10,
 		.i8254_offset	= 0x0c,
@@ -1298,7 +1286,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 7692,
 		.ai_pg		= das16_pg_16jr,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1310,7 +1297,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 3300,
 		.ai_pg		= das16_pg_16jr,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1322,7 +1308,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_16jr_16,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1334,7 +1319,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_16jr_16,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1346,7 +1330,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 20000,
 		.ai_pg		= das16_pg_none,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1358,7 +1341,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_none,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1370,7 +1352,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_1601,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x0,
 		.i8254_offset	= 0x0c,
@@ -1382,7 +1363,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_1602,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x0,
 		.i8254_offset	= 0x0c,
@@ -1395,7 +1375,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_1601,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1408,7 +1387,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_1602,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1420,7 +1398,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 6250,
 		.ai_pg		= das16_pg_1601,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1432,7 +1409,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 6250,
 		.ai_pg		= das16_pg_1602,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1444,7 +1420,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 10000,
 		.ai_pg		= das16_pg_1602,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,
@@ -1457,7 +1432,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_1601,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1470,7 +1444,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_1602,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1483,7 +1456,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_pg		= das16_pg_1602,
 		.ao		= das16_ao_winsn,
 		.ao_nbits	= 12,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0x400,
 		.i8254_offset	= 0x0c,
@@ -1495,7 +1467,6 @@ static const struct das16_board das16_boards[] = {
 		.ai_speed	= 3030,
 		.ai_pg		= das16_pg_16jr,
 		.ao		= NULL,
-		.di		= das16_di_rbits,
 		.do_		= das16_do_wbits,
 		.i8255_offset	= 0,
 		.i8254_offset	= 0x0c,