staging: comedi: addi_apci_3120: fix digital input 'insn_bits' function

This driver does not follow the comedi API. The digital input 'insn_bits'
function is supposed to return the status of all the input channels in
data[1]. Currently this function returns the status in data[0].

Fix the function so it works like the comedi core expects. The core can
then use the function to emulate the 'insn_read' function for individual
channels.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
index 0946917..d5dea34 100644 (file)
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
@@ -2186,57 +2186,18 @@ static int i_APCI3120_InsnReadTimer(struct comedi_device *dev,
        return insn->n;
 }
 
-/*
- * Reads the value of the specified Digital input channel
- */
-static int i_APCI3120_InsnReadDigitalInput(struct comedi_device *dev,
-                                          struct comedi_subdevice *s,
-                                          struct comedi_insn *insn,
-                                          unsigned int *data)
-{
-       struct addi_private *devpriv = dev->private;
-       unsigned int ui_Chan, ui_TmpValue;
-
-       ui_Chan = CR_CHAN(insn->chanspec);      /*  channel specified */
-
-       /* this_board->di_read(dev,ui_Chan,data); */
-       if (ui_Chan <= 3) {
-               ui_TmpValue = (unsigned int) inw(devpriv->iobase + APCI3120_RD_STATUS);
-
-/*
- * since only 1 channel reqd to bring it to last bit it is rotated 8
- * +(chan - 1) times then ANDed with 1 for last bit.
- */
-               *data = (ui_TmpValue >> (ui_Chan + 8)) & 1;
-               /* return 0; */
-       } else {
-               /*       comedi_error(dev," chan spec wrong"); */
-               return -EINVAL; /*  "sorry channel spec wrong " */
-       }
-       return insn->n;
-
-}
-
-/*
- * Reads the value of the Digital input Port i.e.4channels
- * value is returned in data[0]
- */
-static int i_APCI3120_InsnBitsDigitalInput(struct comedi_device *dev,
-                                          struct comedi_subdevice *s,
-                                          struct comedi_insn *insn,
-                                          unsigned int *data)
+static int apci3120_di_insn_bits(struct comedi_device *dev,
+                                struct comedi_subdevice *s,
+                                struct comedi_insn *insn,
+                                unsigned int *data)
 {
        struct addi_private *devpriv = dev->private;
-       unsigned int ui_TmpValue;
+       unsigned int val;
 
-       ui_TmpValue = (unsigned int) inw(devpriv->iobase + APCI3120_RD_STATUS);
-       /*****  state of 4 channels  in the 11, 10, 9, 8   bits of status reg
-                       rotated right 8 times to bring them to last four bits
-                       ANDed with oxf for  value.
-       *****/
+       /* the input channels are bits 11:8 of the status reg */
+       val = inw(devpriv->iobase + APCI3120_RD_STATUS);
+       data[1] = (val >> 8) & 0xf;
 
-       *data = (ui_TmpValue >> 8) & 0xf;
-       /* this_board->di_bits(dev,data); */
        return insn->n;
 }
 

diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index da31126..bd53a0c 100644 (file)
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -179,8 +179,7 @@ static int apci3120_attach_pci(struct comedi_device *dev,
        s->len_chanlist = this_board->i_NbrDiChannel;
        s->range_table = &range_digital;
        s->io_bits = 0; /* all bits input */
-       s->insn_read = i_APCI3120_InsnReadDigitalInput;
-       s->insn_bits = i_APCI3120_InsnBitsDigitalInput;
+       s->insn_bits = apci3120_di_insn_bits;
 
        /*  Allocate and Initialise DO Subdevice Structures */
        s = &dev->subdevices[3];