staging: comedi: pcmuio: remove 'iobases' from subdevice private data

The 'asic' and 'port' associated with a given subdevice can easily be
found based on the subdevice 'index'. With that information we can
then calculate the correct iobase and register offset needed to read/
write the 8-bit ports.

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>

diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index b942b0a..b2860c0 100644 (file)
--- a/drivers/staging/comedi/drivers/pcmuio.c
+++ b/drivers/staging/comedi/drivers/pcmuio.c
@@ -141,9 +141,6 @@ static const struct pcmuio_board pcmuio_boards[] = {
 };
 
 struct pcmuio_subdev_private {
-       /* mapping of halfwords (bytes) in port/chanarray to iobase */
-       unsigned long iobases[PORTS_PER_SUBDEV];
-
        /* The below is only used for intr subdevices */
        struct {
                /* if non-negative, this subdev has an interrupt asic */
@@ -190,7 +187,9 @@ static int pcmuio_dio_insn_bits(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn, unsigned int *data)
 {
-       struct pcmuio_subdev_private *subpriv = s->private;
+       int asic = s->index / 2;
+       int port = (s->index % 2) ? 3 : 0;
+       unsigned long iobase = dev->iobase + (asic * ASIC_IOSIZE);
        int byte_no;
 
        /* NOTE:
@@ -207,10 +206,8 @@ static int pcmuio_dio_insn_bits(struct comedi_device *dev,
        s->state = 0;
 
        for (byte_no = 0; byte_no < s->n_chan / CHANS_PER_PORT; ++byte_no) {
-               /* address of 8-bit port */
-               unsigned long ioaddr = subpriv->iobases[byte_no],
-                   /* bit offset of port in 32-bit doubleword */
-                   offset = byte_no * 8;
+               /* bit offset of port in 32-bit doubleword */
+               unsigned long offset = byte_no * 8;
                /* this 8-bit port's data */
                unsigned char byte = 0,
                    /* The write mask for this port (if any) */
@@ -218,12 +215,12 @@ static int pcmuio_dio_insn_bits(struct comedi_device *dev,
                    /* The data byte for this port */
                    data_byte = (data[1] >> offset) & 0xff;
 
-               byte = inb(ioaddr);     /* read all 8-bits for this port */
+               byte = inb(iobase + PCMUIO_PORT_REG(port + byte_no));
 
                if (write_mask_byte) {
                        byte &= ~write_mask_byte;
                        byte |= ~data_byte & write_mask_byte;
-                       outb(byte, ioaddr);
+                       outb(byte, iobase + PCMUIO_PORT_REG(port + byte_no));
                }
                /* save the digital input lines for this byte.. */
                s->state |= ((unsigned int)byte) << offset;
@@ -239,15 +236,14 @@ static int pcmuio_dio_insn_config(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
                                  struct comedi_insn *insn, unsigned int *data)
 {
-       struct pcmuio_subdev_private *subpriv = s->private;
-       int chan = CR_CHAN(insn->chanspec), byte_no = chan / 8, bit_no =
-           chan % 8;
-       unsigned long ioaddr;
+       int asic = s->index / 2;
+       int port = (s->index % 2) ? 3 : 0;
+       unsigned long iobase = dev->iobase + (asic * ASIC_IOSIZE);
+       unsigned int chan = CR_CHAN(insn->chanspec);
+       int byte_no = chan / 8;
+       int bit_no = chan % 8;
        unsigned char byte;
 
-       /* Compute ioaddr for this channel */
-       ioaddr = subpriv->iobases[byte_no];
-
        /* NOTE:
           writing a 0 an IO channel's bit sets the channel to INPUT
           and pulls the line high as well
@@ -269,7 +265,7 @@ static int pcmuio_dio_insn_config(struct comedi_device *dev,
        case INSN_CONFIG_DIO_INPUT:
                /* write a 0 to the actual register representing the channel
                   to set it to 'input'.  0 means "float high". */
-               byte = inb(ioaddr);
+               byte = inb(iobase + PCMUIO_PORT_REG(port + byte_no));
                byte &= ~(1 << bit_no);
                                /**< set input channel to '0' */
 
@@ -279,7 +275,7 @@ static int pcmuio_dio_insn_config(struct comedi_device *dev,
                 * as all channels are implicitly output -- but input
                 * channels are set to float-high.
                 */
-               outb(byte, ioaddr);
+               outb(byte, iobase + PCMUIO_PORT_REG(port + byte_no));
 
                /* save to io_bits */
                s->io_bits &= ~(1 << chan);
@@ -706,8 +702,6 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                subpriv->intr.asic = -1;
                s->len_chanlist = 1;
 
-               /* save the ioport address for each 'port' of 8 channels in the
-                  subdevice */
                for (byte_no = 0; byte_no < PORTS_PER_SUBDEV;
                     ++byte_no, ++port) {
                        if (port >= PORTS_PER_ASIC) {
@@ -715,8 +709,6 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                                ++asic;
                                thisasic_chanct = 0;
                        }
-                       subpriv->iobases[byte_no] = dev->iobase +
-                                                   (asic * ASIC_IOSIZE) + port;
 
                        if (thisasic_chanct <
                            CHANS_PER_PORT * INTR_PORTS_PER_ASIC