Staging: comedi: add pcl725 driver

Driver for Advantech PCL-725 & compatibles

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

drivers/staging/comedi/drivers/pcl725.c

+/*
+ * comedi/drivers/pcl725.c
+ * Driver for PCL725 and clones
+ * David A. Schleef
+ */
+/*
+Driver: pcl725
+Description: Advantech PCL-725 (& compatibles)
+Author: ds
+Status: unknown
+Devices: [Advantech] PCL-725 (pcl725)
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+
+#define PCL725_SIZE 2
+
+#define PCL725_DO 0
+#define PCL725_DI 1
+
+static int pcl725_attach(comedi_device * dev, comedi_devconfig * it);
+static int pcl725_detach(comedi_device * dev);
+static comedi_driver driver_pcl725 = {
+      driver_name:"pcl725",
+      module:THIS_MODULE,
+      attach:pcl725_attach,
+      detach:pcl725_detach,
+};
+
+COMEDI_INITCLEANUP(driver_pcl725);
+
+static int pcl725_do_insn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	if (insn->n != 2)
+		return -EINVAL;
+
+	if (data[0]) {
+		s->state &= ~data[0];
+		s->state |= (data[0] & data[1]);
+		outb(s->state, dev->iobase + PCL725_DO);
+	}
+
+	data[1] = s->state;
+
+	return 2;
+}
+
+static int pcl725_di_insn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	if (insn->n != 2)
+		return -EINVAL;
+
+	data[1] = inb(dev->iobase + PCL725_DI);
+
+	return 2;
+}
+
+static int pcl725_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *s;
+	unsigned long iobase;
+
+	iobase = it->options[0];
+	printk("comedi%d: pcl725: 0x%04lx ", dev->minor, iobase);
+	if (!request_region(iobase, PCL725_SIZE, "pcl725")) {
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+	dev->board_name = "pcl725";
+	dev->iobase = iobase;
+	dev->irq = 0;
+
+	if (alloc_subdevices(dev, 2) < 0)
+		return -ENOMEM;
+
+	s = dev->subdevices + 0;
+	/* do */
+	s->type = COMEDI_SUBD_DO;
+	s->subdev_flags = SDF_WRITABLE;
+	s->maxdata = 1;
+	s->n_chan = 8;
+	s->insn_bits = pcl725_do_insn;
+	s->range_table = &range_digital;
+
+	s = dev->subdevices + 1;
+	/* di */
+	s->type = COMEDI_SUBD_DI;
+	s->subdev_flags = SDF_READABLE;
+	s->maxdata = 1;
+	s->n_chan = 8;
+	s->insn_bits = pcl725_di_insn;
+	s->range_table = &range_digital;
+
+	printk("\n");
+
+	return 0;
+}
+
+static int pcl725_detach(comedi_device * dev)
+{
+	printk("comedi%d: pcl725: remove\n", dev->minor);
+
+	if (dev->iobase)
+		release_region(dev->iobase, PCL725_SIZE);
+
+	return 0;
+}