Staging: comedi: add acl7225b driver

For Adlink NuDAQ ACL-7225b & compatibles

From: José Luis Sánchez <jsanchezv@teleline.es>
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/acl7225b.c

+/*
+ * comedi/drivers/acl7225b.c
+ * Driver for Adlink NuDAQ ACL-7225b and clones
+ * José Luis Sánchez
+ */
+/*
+Driver: acl7225b
+Description: Adlink NuDAQ ACL-7225b & compatibles
+Author: José Luis Sánchez (jsanchezv@teleline.es)
+Status: testing
+Devices: [Adlink] ACL-7225b (acl7225b), [ICP] P16R16DIO (p16r16dio)
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+
+#define ACL7225_SIZE   8	/* Requires 8 ioports, but only 4 are used */
+#define P16R16DIO_SIZE 4
+#define ACL7225_RIO_LO 0	/* Relays input/output low byte (R0-R7) */
+#define ACL7225_RIO_HI 1	/* Relays input/output high byte (R8-R15) */
+#define ACL7225_DI_LO  2	/* Digital input low byte (DI0-DI7) */
+#define ACL7225_DI_HI  3	/* Digital input high byte (DI8-DI15) */
+
+static int acl7225b_attach(comedi_device * dev, comedi_devconfig * it);
+static int acl7225b_detach(comedi_device * dev);
+
+typedef struct {
+	const char *name;	// driver name
+	int io_range;		// len of I/O space
+} boardtype;
+
+static const boardtype boardtypes[] = {
+	{"acl7225b", ACL7225_SIZE,},
+	{"p16r16dio", P16R16DIO_SIZE,},
+};
+
+#define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))
+#define this_board ((const boardtype *)dev->board_ptr)
+
+static comedi_driver driver_acl7225b = {
+      driver_name:"acl7225b",
+      module:THIS_MODULE,
+      attach:acl7225b_attach,
+      detach:acl7225b_detach,
+      board_name:&boardtypes[0].name,
+      num_names:n_boardtypes,
+      offset:sizeof(boardtype),
+};
+
+COMEDI_INITCLEANUP(driver_acl7225b);
+
+static int acl7225b_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]);
+	}
+	if (data[0] & 0x00ff)
+		outb(s->state & 0xff, dev->iobase + (unsigned long)s->private);
+	if (data[0] & 0xff00)
+		outb((s->state >> 8),
+			dev->iobase + (unsigned long)s->private + 1);
+
+	data[1] = s->state;
+
+	return 2;
+}
+
+static int acl7225b_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 + (unsigned long)s->private) |
+		(inb(dev->iobase + (unsigned long)s->private + 1) << 8);
+
+	return 2;
+}
+
+static int acl7225b_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *s;
+	int iobase, iorange;
+
+	iobase = it->options[0];
+	iorange = this_board->io_range;
+	printk("comedi%d: acl7225b: board=%s 0x%04x ", dev->minor,
+		this_board->name, iobase);
+	if (!request_region(iobase, iorange, "acl7225b")) {
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+	dev->board_name = this_board->name;
+	dev->iobase = iobase;
+	dev->irq = 0;
+
+	if (alloc_subdevices(dev, 3) < 0)
+		return -ENOMEM;
+
+	s = dev->subdevices + 0;
+	/* Relays outputs */
+	s->type = COMEDI_SUBD_DO;
+	s->subdev_flags = SDF_WRITABLE;
+	s->maxdata = 1;
+	s->n_chan = 16;
+	s->insn_bits = acl7225b_do_insn;
+	s->range_table = &range_digital;
+	s->private = (void *)ACL7225_RIO_LO;
+
+	s = dev->subdevices + 1;
+	/* Relays status */
+	s->type = COMEDI_SUBD_DI;
+	s->subdev_flags = SDF_READABLE;
+	s->maxdata = 1;
+	s->n_chan = 16;
+	s->insn_bits = acl7225b_di_insn;
+	s->range_table = &range_digital;
+	s->private = (void *)ACL7225_RIO_LO;
+
+	s = dev->subdevices + 2;
+	/* Isolated digital inputs */
+	s->type = COMEDI_SUBD_DI;
+	s->subdev_flags = SDF_READABLE;
+	s->maxdata = 1;
+	s->n_chan = 16;
+	s->insn_bits = acl7225b_di_insn;
+	s->range_table = &range_digital;
+	s->private = (void *)ACL7225_DI_LO;
+
+	printk("\n");
+
+	return 0;
+}
+
+static int acl7225b_detach(comedi_device * dev)
+{
+	printk("comedi%d: acl7225b: remove\n", dev->minor);
+
+	if (dev->iobase)
+		release_region(dev->iobase, this_board->io_range);
+
+	return 0;
+}