Computer Boards PCIM-DDA06-16 Comedi driver
+ Author: Calin Culianu <calin@ajvar.org>
+
This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output
card. This board has a unique register layout and as such probably
deserves its own driver file.
file, but since that isn't my code, I didn't want to significantly
modify that file to support this board (I thought it impolite to do so).
- At any rate, if yo ufeel ambitious, please feel free to take
+ At any rate, if you feel ambitious, please feel free to take
the code out of this file and combine it with a more unified driver
file.
- -Calin Culianu <calin@ajvar.org>
+ I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>
+ for lending me a board so that I could write this driver.
+ -Calin Culianu <calin@ajvar.org>
+
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 2000 David A. Schleef <ds@schleef.org>
#include <linux/comedidev.h>
#include "8255.h"
-/* IO Region for the control, analog output, and DIO registers */
-#define REGS_BADRINDEX 3
/* device ids of the cards we support -- currently only 1 card supported */
#define PCI_ID_PCIM_DDA06_16 0x0053
int ai_bits;
int dio_chans;
int dio_method;
- int dio_offset;
+ int dio_offset; /* how many bytes into the BADR are the DIO ports */
+ int regs_badrindex; /* IO Region for the control, analog output,
+ and DIO registers */
+ int reg_sz; /* number of bytes of registers in io region */
comedi_lrange *ai_range_table;
comedi_lrange *ao_range_table;
} board;
static board boards[] = {
{
name: "cb_pcimdda06-16",
- device_id: PCI_ID_PCIM_DDA06_16,
- ao_chans: 6,
- ao_bits: 16,
- ai_chans: 0, /* No AI on this board */
- ai_bits: 0,
- dio_chans: 24,
- dio_method: DIO_8255,
- dio_offset: 12, /* how many bytes into the BADR are the DIO ports */
+ device_id: PCI_ID_PCIM_DDA06_16,
+ ao_chans: 6,
+ ao_bits: 16,
+ ai_chans: 0, /* No AI on this board */
+ ai_bits: 0,
+ dio_chans: 24,
+ dio_method: DIO_8255,
+ dio_offset: 12,
+ regs_badrindex: 3,
+ reg_sz: 16,
ai_range_table: &range_bipolar5, // dummy, since we have no AI
/* this board only has one, jumper setable range, +/-5V
you can also set it to +/-10V via jumper, but we will
}
};
+/*
+ * Useful for shorthand access to the particular board structure
+ */
+#define thisboard ((board *)dev->board_ptr)
+
/* Number of boards in boards[] */
#define N_BOARDS (sizeof(boards) / sizeof(board))
-
+#define REG_SZ (thisboard->reg_sz)
+#define REGS_BADRINDEX (thisboard->regs_badrindex)
/* This is used by modprobe to translate PCI IDs to drivers. Should
* only be used for PCI and ISA-PnP devices */
};
MODULE_DEVICE_TABLE(pci, pci_table);
-/*
- * Useful for shorthand access to the particular board structure
- */
-#define thisboard ((board *)dev->board_ptr)
/* this structure is for data unique to this hardware driver. If
several hardware drivers keep similar information in this structure,
typedef struct {
int registers; /* set by probe */
int dio_registers;
- int attached_to_8255;
- /* would be useful for a PCI device */
+ char attached_to_8255; /* boolean */
+ char attached_successfully; /* boolean */
+ /* would be useful for a PCI device */
struct pci_dev *pci_dev;
#define MAX_AO_READBACK_CHANNELS 6
- /* Used for AO readback */
- lsampl_t ao_readback[MAX_AO_READBACK_CHANNELS];
+ /* Used for AO readback */
+ lsampl_t ao_readback[MAX_AO_READBACK_CHANNELS];
+
} private;
/*
*
* Prerequisite: private be allocated already inside dev
*
- * If the device is found, it returns 1 and has the following side effects:
+ * If the device is found, it returns 0 and has the following side effects:
*
* o assigns a struct pci_dev * to dev->private->pci_dev
* o assigns a struct board * to dev->board_ptr
* o sets dev->private->registers
* o sets dev->private->dio_registers
*
- * Otherwise, returns 0 if a supported device is not found
+ * Otherwise, returns a -errno on error
*/
static int probe(comedi_device *dev, const comedi_devconfig *it);
+
+/*---------------------------------------------------------------------------
+ FUNCTION DEFINITIONS
+-----------------------------------------------------------------------------*/
+
/*
* Attach is called by the Comedi core to configure the driver
* for a particular board. If you specified a board_name array
static int attach(comedi_device *dev,comedi_devconfig *it)
{
comedi_subdevice *s;
-
+ int err;
+
/*
* Allocate the private structure area. alloc_private() is a
* convenient macro defined in comedidev.h.
* If you can probe the device to determine what device in a series
* it is, this is the place to do it. Otherwise, dev->board_ptr
* should already be initialized.
- */
-
-
- if (!probe(dev, it)) {
- printk("No supported ComputerBoards/MeasurementComputing "
- "card found at the requested position\n");
- return -ENODEV;
- }
+ */
+ if ( (err = probe(dev, it)) ) return err;
+
/* Output some info */
printk("comedi%d: %s: ",dev->minor, thisboard->name);
s->type = COMEDI_SUBD_UNUSED;
}
- printk("attached\n");
+ devpriv->attached_successfully = 1;
+ printk("attached\n");
+
return 1;
}
*/
static int detach(comedi_device *dev)
{
- if (dev->subdevices && devpriv && devpriv->attached_to_8255) {
- /* de-register us from the 8255 driver */
- subdev_8255_cleanup(dev,dev->subdevices + 2);
- devpriv->attached_to_8255 = 0;
- }
+ if (devpriv) {
+
+ if (devpriv->registers && thisboard) {
+ release_region(devpriv->registers, REG_SZ);
+ devpriv->registers = 0;
+ }
+
+ if (dev->subdevices && devpriv->attached_to_8255) {
+ /* de-register us from the 8255 driver */
+ subdev_8255_cleanup(dev,dev->subdevices + 2);
+ devpriv->attached_to_8255 = 0;
+ }
+
+ if (devpriv->attached_successfully && thisboard)
+ printk("comedi%d: %s: detached\n", dev->minor, thisboard->name);
- if (thisboard)
- printk("comedi%d: %s: detached\n",dev->minor, thisboard->name);
+ }
return 0;
}
int chan = CR_CHAN(insn->chanspec);
- for(i=0;i<insn->n;i++)
- data[i] = inw(devpriv->registers + chan*2);
-#if 0
- /* for testing! */
- if (*data != devpriv->ao_readback[chan]) BUG();
-#endif
- return i;
+ for(i=0;i<insn->n;i++) {
+ inw(devpriv->registers + chan*2);
+ /* should I set data[i] to the result of the actual read on the register
+ or the cached lsampl_t in devpriv->ao_readback[]? */
+ data[i] = devpriv->ao_readback[chan];
+ }
+
+ return i;
}
/* stub... */
*
* Prerequisite: private be allocated already inside dev
*
- * If the device is found, it returns 1 and has the following side effects:
+ * If the device is found, it returns 0 and has the following side effects:
*
* o assigns a struct pci_dev * to dev->private->pci_dev
* o assigns a struct board * to dev->board_ptr
* o sets dev->private->registers
* o sets dev->private->dio_registers
*
- * Otherwise, returns 0 if a supported device is not found
+ * Otherwise, returns a -errno on error
*/
static int probe(comedi_device *dev, const comedi_devconfig *it)
{
struct pci_dev *pcidev;
- int index;
+ int index, registers;
pci_for_each_dev(pcidev)
{
}
/* found ! */
- /* todo: if we support more than 1 board, revise
- this to be more generic */
+ /* todo: if we support more than 1 board, revise
+ this to be more generic */
devpriv->pci_dev = pcidev;
+ pci_enable_device(devpriv->pci_dev); /* make sure board is on */
dev->board_ptr = boards + index;
- devpriv->registers
- = pci_resource_start(devpriv->pci_dev,REGS_BADRINDEX);
- devpriv->dio_registers
- = devpriv->registers + thisboard->dio_offset;
- return 1;
+ registers = pci_resource_start(devpriv->pci_dev, REGS_BADRINDEX);
+ if (!request_region(registers, REG_SZ,thisboard->name))
+ {
+ printk("cb_pcimdda: "
+ "I/O port conflict failed to allocate ports "
+ "0x%x to 0x%x\n", registers,
+ registers + REG_SZ - 1);
+ return -EBUSY;
+ }
+ devpriv->registers = registers;
+ devpriv->dio_registers
+ = devpriv->registers + thisboard->dio_offset;
+ return 0;
}
}
- dev->board_ptr = (void *)0;
- return 0;
+
+ printk("cb_pcimdda: No supported ComputerBoards/MeasurementComputing "
+ "card found at the requested position\n");
+ return -ENODEV;
}
void cleanup_module(void)
{
comedi_driver_unregister(&cb_pcimdda_driver);
-}
+}
+
projects / comedi.git / commitdiff