Staging: comedi: add ke_counter driver

driver for Kolter-Electronic PCI Counter 1 Card

From: Michael Hillmann <hillmann@syscongroup.de>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/ke_counter.c

+/*
+    comedi/drivers/ke_counter.c
+    Comedi driver for Kolter-Electronic PCI Counter 1 Card
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+/*
+Driver: ke_counter
+Description: Driver for Kolter Electronic Counter Card
+Devices: [Kolter Electronic] PCI Counter Card (ke_counter)
+Author: Michael Hillmann
+Updated: Mon, 14 Apr 2008 15:42:42 +0100
+Status: tested
+
+Configuration Options:
+  [0] - PCI bus of device (optional)
+  [1] - PCI slot of device (optional)
+  If bus/slot is not specified, the first supported
+  PCI device found will be used.
+
+This driver is a simple driver to read the counter values from
+Kolter Electronic PCI Counter Card.
+*/
+
+#include "../comedidev.h"
+
+#include "comedi_pci.h"
+
+#define CNT_DRIVER_NAME         "ke_counter"
+#define PCI_VENDOR_ID_KOLTER    0x1001
+#define CNT_CARD_DEVICE_ID      0x0014
+
+/*-- function prototypes ----------------------------------------------------*/
+
+static int cnt_attach(comedi_device * dev, comedi_devconfig * it);
+static int cnt_detach(comedi_device * dev);
+
+static DEFINE_PCI_DEVICE_TABLE(cnt_pci_table) = {
+	{PCI_VENDOR_ID_KOLTER, CNT_CARD_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		0},
+	{0}
+};
+
+MODULE_DEVICE_TABLE(pci, cnt_pci_table);
+
+/*-- board specification structure ------------------------------------------*/
+
+typedef struct {
+	const char *name;
+	int device_id;
+	int cnt_channel_nbr;
+	int cnt_bits;
+} cnt_board_struct;
+
+static const cnt_board_struct cnt_boards[] = {
+	{
+	      name:	CNT_DRIVER_NAME,
+	      device_id:CNT_CARD_DEVICE_ID,
+	      cnt_channel_nbr:3,
+      cnt_bits:24}
+};
+
+#define cnt_board_nbr (sizeof(cnt_boards)/sizeof(cnt_board_struct))
+
+/*-- device private structure -----------------------------------------------*/
+
+typedef struct {
+	struct pci_dev *pcidev;
+} cnt_device_private;
+
+#define devpriv ((cnt_device_private *)dev->private)
+
+static comedi_driver cnt_driver = {
+      driver_name:CNT_DRIVER_NAME,
+      module:THIS_MODULE,
+      attach:cnt_attach,
+      detach:cnt_detach,
+};
+
+COMEDI_PCI_INITCLEANUP(cnt_driver, cnt_pci_table);
+
+/*-- counter write ----------------------------------------------------------*/
+
+/* This should be used only for resetting the counters; maybe it is better
+   to make a special command 'reset'. */
+static int cnt_winsn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data)
+{
+	int chan = CR_CHAN(insn->chanspec);
+
+	outb((unsigned char)((data[0] >> 24) & 0xff),
+		dev->iobase + chan * 0x20 + 0x10);
+	outb((unsigned char)((data[0] >> 16) & 0xff),
+		dev->iobase + chan * 0x20 + 0x0c);
+	outb((unsigned char)((data[0] >> 8) & 0xff),
+		dev->iobase + chan * 0x20 + 0x08);
+	outb((unsigned char)((data[0] >> 0) & 0xff),
+		dev->iobase + chan * 0x20 + 0x04);
+
+	/* return the number of samples written */
+	return 1;
+}
+
+/*-- counter read -----------------------------------------------------------*/
+
+static int cnt_rinsn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data)
+{
+	unsigned char a0, a1, a2, a3, a4;
+	int chan = CR_CHAN(insn->chanspec);
+	int result;
+
+	a0 = inb(dev->iobase + chan * 0x20);
+	a1 = inb(dev->iobase + chan * 0x20 + 0x04);
+	a2 = inb(dev->iobase + chan * 0x20 + 0x08);
+	a3 = inb(dev->iobase + chan * 0x20 + 0x0c);
+	a4 = inb(dev->iobase + chan * 0x20 + 0x10);
+
+	result = (a1 + (a2 * 256) + (a3 * 65536));
+	if (a4 > 0)
+		result = result - s->maxdata;
+
+	*data = (lsampl_t) result;
+
+	/* return the number of samples read */
+	return 1;
+}
+
+/*-- attach -----------------------------------------------------------------*/
+
+static int cnt_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *subdevice;
+	struct pci_dev *pci_device;
+	cnt_board_struct *board;
+	unsigned long io_base;
+	int error, i;
+
+	/* allocate device private structure */
+	if ((error = alloc_private(dev, sizeof(cnt_device_private))) < 0) {
+		return error;
+	}
+
+	/* Probe the device to determine what device in the series it is. */
+	for (pci_device = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
+		pci_device != NULL;
+		pci_device =
+		pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pci_device)) {
+		if (pci_device->vendor == PCI_VENDOR_ID_KOLTER) {
+			for (i = 0; i < cnt_board_nbr; i++) {
+				if (cnt_boards[i].device_id ==
+					pci_device->device) {
+					/* was a particular bus/slot requested? */
+					if ((it->options[0] != 0)
+						|| (it->options[1] != 0)) {
+						/* are we on the wrong bus/slot? */
+						if (pci_device->bus->number !=
+							it->options[0]
+							|| PCI_SLOT(pci_device->
+								devfn) !=
+							it->options[1]) {
+							continue;
+						}
+					}
+
+					dev->board_ptr = cnt_boards + i;
+					board = (cnt_board_struct *) dev->
+						board_ptr;
+					goto found;
+				}
+			}
+		}
+	}
+	printk("comedi%d: no supported board found! (req. bus/slot: %d/%d)\n",
+		dev->minor, it->options[0], it->options[1]);
+	return -EIO;
+
+      found:
+	printk("comedi%d: found %s at PCI bus %d, slot %d\n", dev->minor,
+		board->name, pci_device->bus->number,
+		PCI_SLOT(pci_device->devfn));
+	devpriv->pcidev = pci_device;
+	dev->board_name = board->name;
+
+	/* enable PCI device and request regions */
+	if ((error = comedi_pci_enable(pci_device, CNT_DRIVER_NAME)) < 0) {
+		printk("comedi%d: failed to enable PCI device and request regions!\n", dev->minor);
+		return error;
+	}
+
+	/* read register base address [PCI_BASE_ADDRESS #0] */
+	io_base = pci_resource_start(pci_device, 0);
+	dev->iobase = io_base;
+
+	/* allocate the subdevice structures */
+	if ((error = alloc_subdevices(dev, 1)) < 0) {
+		return error;
+	}
+
+	subdevice = dev->subdevices + 0;
+	dev->read_subdev = subdevice;
+
+	subdevice->type = COMEDI_SUBD_COUNTER;
+	subdevice->subdev_flags = SDF_READABLE /* | SDF_COMMON */ ;
+	subdevice->n_chan = board->cnt_channel_nbr;
+	subdevice->maxdata = (1 << board->cnt_bits) - 1;
+	subdevice->insn_read = cnt_rinsn;
+	subdevice->insn_write = cnt_winsn;
+
+	// select 20MHz clock
+	outb(3, dev->iobase + 248);
+
+	// reset all counters
+	outb(0, dev->iobase);
+	outb(0, dev->iobase + 0x20);
+	outb(0, dev->iobase + 0x40);
+
+	printk("comedi%d: " CNT_DRIVER_NAME " attached.\n", dev->minor);
+	return 0;
+}
+
+/*-- detach -----------------------------------------------------------------*/
+
+static int cnt_detach(comedi_device * dev)
+{
+	if (devpriv && devpriv->pcidev) {
+		if (dev->iobase) {
+			comedi_pci_disable(devpriv->pcidev);
+		}
+		pci_dev_put(devpriv->pcidev);
+	}
+	printk("comedi%d: " CNT_DRIVER_NAME " remove\n", dev->minor);
+	return 0;
+}