This driver currently duplicates the functionality of the 8255 module.
The only difference is in how the i/o access is handled.
Provide a private (*io) callback for the 8255 module to handle the
differences. We can then use that module and initialize the subdevice
with subdev_8255_init().
Update the Kconfig to select the COMEDI_8255 module.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 1 +
.../staging/comedi/drivers/amplc_dio200_common.c | 120 +++------------------
2 files changed, 14 insertions(+), 107 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 36f2c71..d5509d1 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -1266,6 +1266,7 @@ config COMEDI_FC
config COMEDI_AMPLC_DIO200
tristate
+ select COMEDI_8255
config COMEDI_AMPLC_PC236
tristate
diff --git a/drivers/staging/comedi/drivers/amplc_dio200_common.c
b/drivers/staging/comedi/drivers/amplc_dio200_common.c
index 6cadf7e..4eb883c 100644
--- a/drivers/staging/comedi/drivers/amplc_dio200_common.c
+++ b/drivers/staging/comedi/drivers/amplc_dio200_common.c
@@ -27,7 +27,7 @@
#include "amplc_dio200.h"
#include "comedi_fc.h"
#include "8253.h"
-#include "8255.h" /* only for register defines */
+#include "8255.h"
/* 200 series registers */
#define DIO200_IO_SIZE 0x20
@@ -111,10 +111,6 @@ struct dio200_subdev_8254 {
spinlock_t spinlock;
};
-struct dio200_subdev_8255 {
- unsigned int ofs; /* DIO base offset */
-};
-
struct dio200_subdev_intr {
spinlock_t spinlock;
unsigned int ofs;
@@ -178,6 +174,16 @@ static void dio200_write32(struct comedi_device *dev,
outl(val, dev->iobase + offset);
}
+static int dio200_8255_io(struct comedi_device *dev,
+ int dir, int port, int data, unsigned long regbase)
+{
+ if (dir) {
+ dio200_write8(dev, regbase + port, data);
+ return 0;
+ }
+ return dio200_read8(dev, regbase + port);
+}
+
static int dio200_subdev_intr_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@@ -801,106 +807,6 @@ static int dio200_subdev_8254_init(struct comedi_device
*dev,
return 0;
}
-static void dio200_subdev_8255_set_dir(struct comedi_device *dev,
- struct comedi_subdevice *s)
-{
- struct dio200_subdev_8255 *subpriv = s->private;
- int config;
-
- config = I8255_CTRL_CW;
- /* 1 in io_bits indicates output, 1 in config indicates input */
- if (!(s->io_bits & 0x0000ff))
- config |= I8255_CTRL_A_IO;
- if (!(s->io_bits & 0x00ff00))
- config |= I8255_CTRL_B_IO;
- if (!(s->io_bits & 0x0f0000))
- config |= I8255_CTRL_C_LO_IO;
- if (!(s->io_bits & 0xf00000))
- config |= I8255_CTRL_C_HI_IO;
- dio200_write8(dev, subpriv->ofs + I8255_CTRL_REG, config);
-}
-
-static int dio200_subdev_8255_bits(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- struct dio200_subdev_8255 *subpriv = s->private;
- unsigned int mask;
- unsigned int val;
-
- mask = comedi_dio_update_state(s, data);
- if (mask) {
- if (mask & 0xff)
- dio200_write8(dev, subpriv->ofs + I8255_DATA_A_REG,
- s->state & 0xff);
- if (mask & 0xff00)
- dio200_write8(dev, subpriv->ofs + I8255_DATA_B_REG,
- (s->state >> 8) & 0xff);
- if (mask & 0xff0000)
- dio200_write8(dev, subpriv->ofs + I8255_DATA_C_REG,
- (s->state >> 16) & 0xff);
- }
-
- val = dio200_read8(dev, subpriv->ofs + I8255_DATA_A_REG);
- val |= dio200_read8(dev, subpriv->ofs + I8255_DATA_B_REG) << 8;
- val |= dio200_read8(dev, subpriv->ofs + I8255_DATA_C_REG) << 16;
-
- data[1] = val;
-
- return insn->n;
-}
-
-static int dio200_subdev_8255_config(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- unsigned int chan = CR_CHAN(insn->chanspec);
- unsigned int mask;
- int ret;
-
- if (chan < 8)
- mask = 0x0000ff;
- else if (chan < 16)
- mask = 0x00ff00;
- else if (chan < 20)
- mask = 0x0f0000;
- else
- mask = 0xf00000;
-
- ret = comedi_dio_insn_config(dev, s, insn, data, mask);
- if (ret)
- return ret;
-
- dio200_subdev_8255_set_dir(dev, s);
-
- return insn->n;
-}
-
-static int dio200_subdev_8255_init(struct comedi_device *dev,
- struct comedi_subdevice *s,
- unsigned int offset)
-{
- struct dio200_subdev_8255 *subpriv;
-
- subpriv = comedi_alloc_spriv(s, sizeof(*subpriv));
- if (!subpriv)
- return -ENOMEM;
-
- subpriv->ofs = offset;
-
- s->type = COMEDI_SUBD_DIO;
- s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
- s->n_chan = 24;
- s->range_table = &range_digital;
- s->maxdata = 1;
- s->insn_bits = dio200_subdev_8255_bits;
- s->insn_config = dio200_subdev_8255_config;
- dio200_subdev_8255_set_dir(dev, s);
- return 0;
-}
-
static int dio200_subdev_timer_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@@ -1002,8 +908,8 @@ int amplc_dio200_common_attach(struct comedi_device *dev,
unsigned int irq,
break;
case sd_8255:
/* digital i/o subdevice (8255) */
- ret = dio200_subdev_8255_init(dev, s,
- board->sdinfo[n]);
+ ret = subdev_8255_init(dev, s, dio200_8255_io,
+ board->sdinfo[n]);
if (ret < 0)
return ret;
break;
--
2.0.3
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