staging: comedi: addi_apci_2200: fix digital output 'insn_bits' function

This driver does not follow the comedi API. The digital output 'insn_bits'
function is passed a mask value in data[0] indicating which output bits in
data[1] are changing. The function is then supposed to update the outputs
accordingly and then return the current state of the outputs in data[1].

Currently this driver uses the 'insn_write' function to update either a
single or all the output channels. And it uses the 'insn_bits' function
to read either a single or all the output channel states.

Fix the 'insn_bits' function so it works like the comedi core expects. The
core can then use the function to emulate the 'insn_read' and 'insn_write'
functions 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_apci2200.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci2200.c
index 7baccf7a9deb86f4caf41497ce29d12b961cab73..1396696a3050ac4072935a77be5b26c23e132348 100644 (file)
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci2200.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci2200.c
@@ -111,231 +111,25 @@ static int i_APCI2200_ConfigDigitalOutput(struct comedi_device *dev,
        return insn->n;
 }
 
-/*
-+----------------------------------------------------------------------------+
-| Function   Name   : int i_APCI2200_WriteDigitalOutput                      |
-|                      (struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,
-|                     unsigned int *data)                                         |
-+----------------------------------------------------------------------------+
-| Task              : Writes port value  To the selected port                |
-+----------------------------------------------------------------------------+
-| Input Parameters  : struct comedi_device *dev      : Driver handle                |
-|                     struct comedi_subdevice *s,   :pointer to subdevice structure
-|                      struct comedi_insn *insn      :pointer to insn structure      |
-|                    unsigned int *data           : Data Pointer to read status  |
-+----------------------------------------------------------------------------+
-| Output Parameters :  --                                                                                                       |
-+----------------------------------------------------------------------------+
-| Return Value      : TRUE  : No error occur                                 |
-|                          : FALSE : Error occur. Return the error          |
-|                                                                               |
-+----------------------------------------------------------------------------+
-*/
-
-static int i_APCI2200_WriteDigitalOutput(struct comedi_device *dev,
-                                        struct comedi_subdevice *s,
-                                        struct comedi_insn *insn,
-                                        unsigned int *data)
+static int apci2200_do_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_Temp, ui_Temp1;
-       unsigned int ui_NoOfChannel = CR_CHAN(insn->chanspec);  /*  get the channel */
+       unsigned int mask = data[0];
+       unsigned int bits = data[1];
 
-       if (devpriv->b_OutputMemoryStatus) {
-               ui_Temp = inw(devpriv->iobase + APCI2200_DIGITAL_OP);
+       s->state = inw(devpriv->iobase + APCI2200_DIGITAL_OP);
+       if (mask) {
+               s->state &= ~mask;
+               s->state |= (bits & mask);
 
-       }                       /* if(devpriv->b_OutputMemoryStatus ) */
-       else {
-               ui_Temp = 0;
-       }                       /* if(devpriv->b_OutputMemoryStatus ) */
-       if (data[3] == 0) {
-               if (data[1] == 0) {
-                       data[0] = (data[0] << ui_NoOfChannel) | ui_Temp;
-                       outw(data[0], devpriv->iobase + APCI2200_DIGITAL_OP);
-               }               /* if(data[1]==0) */
-               else {
-                       if (data[1] == 1) {
-                               switch (ui_NoOfChannel) {
-
-                               case 2:
-                                       data[0] =
-                                               (data[0] << (2 *
-                                                       data[2])) | ui_Temp;
-                                       break;
-
-                               case 4:
-                                       data[0] =
-                                               (data[0] << (4 *
-                                                       data[2])) | ui_Temp;
-                                       break;
-
-                               case 8:
-                                       data[0] =
-                                               (data[0] << (8 *
-                                                       data[2])) | ui_Temp;
-                                       break;
-                               case 15:
-                                       data[0] = data[0] | ui_Temp;
-                                       break;
-                               default:
-                                       comedi_error(dev, " chan spec wrong");
-                                       return -EINVAL; /*  "sorry channel spec wrong " */
-
-                               }       /* switch(ui_NoOfChannels) */
-
-                               outw(data[0],
-                                       devpriv->iobase + APCI2200_DIGITAL_OP);
-                       }       /*  if(data[1]==1) */
-                       else {
-                               printk("\nSpecified channel not supported\n");
-                       }       /* else if(data[1]==1) */
-               }               /* elseif(data[1]==0) */
-       }                       /* if(data[3]==0) */
-       else {
-               if (data[3] == 1) {
-                       if (data[1] == 0) {
-                               data[0] = ~data[0] & 0x1;
-                               ui_Temp1 = 1;
-                               ui_Temp1 = ui_Temp1 << ui_NoOfChannel;
-                               ui_Temp = ui_Temp | ui_Temp1;
-                               data[0] = (data[0] << ui_NoOfChannel) ^ 0xffff;
-                               data[0] = data[0] & ui_Temp;
-                               outw(data[0],
-                                       devpriv->iobase + APCI2200_DIGITAL_OP);
-                       }       /* if(data[1]==0) */
-                       else {
-                               if (data[1] == 1) {
-                                       switch (ui_NoOfChannel) {
-
-                                       case 2:
-                                               data[0] = ~data[0] & 0x3;
-                                               ui_Temp1 = 3;
-                                               ui_Temp1 =
-                                                       ui_Temp1 << 2 * data[2];
-                                               ui_Temp = ui_Temp | ui_Temp1;
-                                               data[0] =
-                                                       ((data[0] << (2 *
-                                                                       data
-                                                                       [2])) ^
-                                                       0xffff) & ui_Temp;
-                                               break;
-
-                                       case 4:
-                                               data[0] = ~data[0] & 0xf;
-                                               ui_Temp1 = 15;
-                                               ui_Temp1 =
-                                                       ui_Temp1 << 4 * data[2];
-                                               ui_Temp = ui_Temp | ui_Temp1;
-                                               data[0] =
-                                                       ((data[0] << (4 *
-                                                                       data
-                                                                       [2])) ^
-                                                       0xffff) & ui_Temp;
-                                               break;
-
-                                       case 8:
-                                               data[0] = ~data[0] & 0xff;
-                                               ui_Temp1 = 255;
-                                               ui_Temp1 =
-                                                       ui_Temp1 << 8 * data[2];
-                                               ui_Temp = ui_Temp | ui_Temp1;
-                                               data[0] =
-                                                       ((data[0] << (8 *
-                                                                       data
-                                                                       [2])) ^
-                                                       0xffff) & ui_Temp;
-                                               break;
-                                       case 15:
-                                               break;
-
-                                       default:
-                                               comedi_error(dev,
-                                                       " chan spec wrong");
-                                               return -EINVAL; /*  "sorry channel spec wrong " */
-
-                                       }       /* switch(ui_NoOfChannels) */
-
-                                       outw(data[0],
-                                               devpriv->iobase +
-                                               APCI2200_DIGITAL_OP);
-                               }       /*  if(data[1]==1) */
-                               else {
-                                       printk("\nSpecified channel not supported\n");
-                               }       /* else if(data[1]==1) */
-                       }       /* elseif(data[1]==0) */
-               }               /* if(data[3]==1); */
-               else {
-                       printk("\nSpecified functionality does not exist\n");
-                       return -EINVAL;
-               }               /* if else data[3]==1) */
-       }                       /* if else data[3]==0) */
-       return insn->n;
-}
+               outw(s->state, devpriv->iobase + APCI2200_DIGITAL_OP);
+       }
 
-/*
-+----------------------------------------------------------------------------+
-| Function   Name   : int i_APCI2200_ReadDigitalOutput                       |
-|                      (struct comedi_device *dev,struct comedi_subdevice *s,struct comedi_insn *insn,
-|                    unsigned int *data)                                            |
-+----------------------------------------------------------------------------+
-| Task              : Read  value  of the selected channel or port           |
-+----------------------------------------------------------------------------+
-| Input Parameters  : struct comedi_device *dev      : Driver handle                |
-|                     struct comedi_subdevice *s,   :pointer to subdevice structure
-|                     struct comedi_insn *insn      :pointer to insn structure      |
-|                     unsigned int *data          : Data Pointer to read status  |
-+----------------------------------------------------------------------------+
-| Output Parameters :  --                                                                                                       |
-+----------------------------------------------------------------------------+
-| Return Value      : TRUE  : No error occur                                 |
-|                          : FALSE : Error occur. Return the error          |
-|                                                                               |
-+----------------------------------------------------------------------------+
-*/
+       data[1] = s->state;
 
-static int i_APCI2200_ReadDigitalOutput(struct comedi_device *dev,
-                                       struct comedi_subdevice *s,
-                                       struct comedi_insn *insn,
-                                       unsigned int *data)
-{
-       struct addi_private *devpriv = dev->private;
-       unsigned int ui_Temp;
-       unsigned int ui_NoOfChannel = CR_CHAN(insn->chanspec);  /*  get the channel */
-
-       ui_Temp = data[0];
-       *data = inw(devpriv->iobase + APCI2200_DIGITAL_OP);
-       if (ui_Temp == 0) {
-               *data = (*data >> ui_NoOfChannel) & 0x1;
-       }                       /* if(ui_Temp==0) */
-       else {
-               if (ui_Temp == 1) {
-                       switch (ui_NoOfChannel) {
-
-                       case 2:
-                               *data = (*data >> (2 * data[1])) & 3;
-                               break;
-
-                       case 4:
-                               *data = (*data >> (4 * data[1])) & 15;
-                               break;
-
-                       case 8:
-                               *data = (*data >> (8 * data[1])) & 255;
-                               break;
-
-                       case 15:
-                               break;
-
-                       default:
-                               comedi_error(dev, " chan spec wrong");
-                               return -EINVAL; /*  "sorry channel spec wrong " */
-
-                       }       /* switch(ui_NoOfChannels) */
-               }               /* if(ui_Temp==1) */
-               else {
-                       printk("\nSpecified channel not supported \n");
-               }               /* elseif(ui_Temp==1) */
-       }                       /* elseif(ui_Temp==0) */
        return insn->n;
 }
 

diff --git a/drivers/staging/comedi/drivers/addi_apci_2200.c b/drivers/staging/comedi/drivers/addi_apci_2200.c
index 99ce93cca3982eabd7b2ccbaff9b69ff5a136b87..cf406595c73733074ed119c0f46d97dda0f16de4 100644 (file)
--- a/drivers/staging/comedi/drivers/addi_apci_2200.c
+++ b/drivers/staging/comedi/drivers/addi_apci_2200.c
@@ -23,8 +23,7 @@ static const struct addi_board apci2200_boardtypes[] = {
                .reset                  = i_APCI2200_Reset,
                .di_bits                = apci2200_di_insn_bits,
                .do_config              = i_APCI2200_ConfigDigitalOutput,
-               .do_write               = i_APCI2200_WriteDigitalOutput,
-               .do_bits                = i_APCI2200_ReadDigitalOutput,
+               .do_bits                = apci2200_do_insn_bits,
                .timer_config           = i_APCI2200_ConfigWatchdog,
                .timer_write            = i_APCI2200_StartStopWriteWatchdog,
                .timer_read             = i_APCI2200_ReadWatchdog,