Staging: comedi: add pcl724 driver

For Advantech cards:
	PCL-724, PCL-722, PCL-731 ADLink ACL-7122, ACL-7124, PET-48DIO

From: Michal Dobes <dobes@tesnet.cz>
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/pcl724.c

+/*
+    comedi/drivers/pcl724.c
+
+    Michal Dobes <dobes@tesnet.cz>
+
+    hardware driver for Advantech cards:
+     card:   PCL-724, PCL-722, PCL-731
+     driver: pcl724,  pcl722,  pcl731
+    and ADLink cards:
+     card:   ACL-7122, ACL-7124, PET-48DIO
+     driver: acl7122,  acl7124,  pet48dio
+
+    Options for PCL-724, PCL-731, ACL-7124 and PET-48DIO:
+     [0] - IO Base
+
+    Options for PCL-722 and ACL-7122:
+     [0] - IO Base
+     [1] - IRQ (0=disable IRQ) IRQ isn't supported at this time!
+     [2] -number of DIO:
+              0, 144: 144 DIO configuration
+	      1,  96:  96 DIO configuration
+*/
+/*
+Driver: pcl724
+Description: Advantech PCL-724, PCL-722, PCL-731 ADLink ACL-7122, ACL-7124,
+  PET-48DIO
+Author: Michal Dobes <dobes@tesnet.cz>
+Devices: [Advantech] PCL-724 (pcl724), PCL-722 (pcl722), PCL-731 (pcl731),
+  [ADLink] ACL-7122 (acl7122), ACL-7124 (acl7124), PET-48DIO (pet48dio)
+Status: untested
+
+This is driver for digital I/O boards PCL-722/724/731 with 144/24/48 DIO
+and for digital I/O boards ACL-7122/7124/PET-48DIO with 144/24/48 DIO.
+It need 8255.o for operations and only immediate mode is supported.
+See the source for configuration details.
+*/
+/*
+ * check_driver overrides:
+ *   comedi_insn
+ */
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <linux/delay.h>
+
+#include "8255.h"
+
+#define PCL722_SIZE    32
+#define PCL722_96_SIZE 16
+#define PCL724_SIZE     4
+#define PCL731_SIZE     8
+#define PET48_SIZE      2
+
+#define SIZE_8255	4
+
+// #define PCL724_IRQ   1  /* no IRQ support now */
+
+static int pcl724_attach(comedi_device * dev, comedi_devconfig * it);
+static int pcl724_detach(comedi_device * dev);
+
+typedef struct {
+	const char *name;	// board name
+	int dio;		// num of DIO
+	int numofports;		// num of 8255 subdevices
+	unsigned int IRQbits;	// allowed interrupts
+	unsigned int io_range;	// len of IO space
+	char can_have96;
+	char is_pet48;
+} boardtype;
+
+static const boardtype boardtypes[] = {
+	{"pcl724", 24, 1, 0x00fc, PCL724_SIZE, 0, 0,},
+	{"pcl722", 144, 6, 0x00fc, PCL722_SIZE, 1, 0,},
+	{"pcl731", 48, 2, 0x9cfc, PCL731_SIZE, 0, 0,},
+	{"acl7122", 144, 6, 0x9ee8, PCL722_SIZE, 1, 0,},
+	{"acl7124", 24, 1, 0x00fc, PCL724_SIZE, 0, 0,},
+	{"pet48dio", 48, 2, 0x9eb8, PET48_SIZE, 0, 1,},
+};
+
+#define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))
+#define this_board ((const boardtype *)dev->board_ptr)
+
+static comedi_driver driver_pcl724 = {
+      driver_name:"pcl724",
+      module:THIS_MODULE,
+      attach:pcl724_attach,
+      detach:pcl724_detach,
+      board_name:&boardtypes[0].name,
+      num_names:n_boardtypes,
+      offset:sizeof(boardtype),
+};
+
+COMEDI_INITCLEANUP(driver_pcl724);
+
+static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
+{
+	unsigned long iobase = arg;
+
+	if (dir) {
+		outb(data, iobase + port);
+		return 0;
+	} else {
+		return inb(iobase + port);
+	}
+}
+
+static int subdev_8255mapped_cb(int dir, int port, int data,
+	unsigned long iobase)
+{
+	int movport = SIZE_8255 * (iobase >> 12);
+
+	iobase &= 0x0fff;
+
+	if (dir) {
+		outb(port + movport, iobase);
+		outb(data, iobase + 1);
+		return 0;
+	} else {
+		outb(port + movport, iobase);
+		return inb(iobase + 1);
+	}
+}
+
+static int pcl724_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	unsigned long iobase;
+	unsigned int iorange;
+	int ret, i, n_subdevices;
+#ifdef PCL724_IRQ
+	unsigned int irq;
+#endif
+
+	iobase = it->options[0];
+	iorange = this_board->io_range;
+	if ((this_board->can_have96) && ((it->options[1] == 1)
+			|| (it->options[1] == 96)))
+		iorange = PCL722_96_SIZE;	// PCL-724 in 96 DIO configuration
+	printk("comedi%d: pcl724: board=%s, 0x%03lx ", dev->minor,
+		this_board->name, iobase);
+	if (!request_region(iobase, iorange, "pcl724")) {
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+
+	dev->iobase = iobase;
+
+	dev->board_name = this_board->name;
+
+#ifdef PCL724_IRQ
+	irq = 0;
+	if (this_board->IRQbits != 0) {	/* board support IRQ */
+		irq = it->options[1];
+		if (irq) {	/* we want to use IRQ */
+			if (((1 << irq) & this_board->IRQbits) == 0) {
+				rt_printk
+					(", IRQ %u is out of allowed range, DISABLING IT",
+					irq);
+				irq = 0;	/* Bad IRQ */
+			} else {
+				if (comedi_request_irq(irq, interrupt_pcl724, 0,
+						"pcl724", dev)) {
+					rt_printk
+						(", unable to allocate IRQ %u, DISABLING IT",
+						irq);
+					irq = 0;	/* Can't use IRQ */
+				} else {
+					rt_printk(", irq=%u", irq);
+				}
+			}
+		}
+	}
+
+	dev->irq = irq;
+#endif
+
+	printk("\n");
+
+	n_subdevices = this_board->numofports;
+	if ((this_board->can_have96) && ((it->options[1] == 1)
+			|| (it->options[1] == 96)))
+		n_subdevices = 4;	// PCL-724 in 96 DIO configuration
+
+	if ((ret = alloc_subdevices(dev, n_subdevices)) < 0)
+		return ret;
+
+	for (i = 0; i < dev->n_subdevices; i++) {
+		if (this_board->is_pet48) {
+			subdev_8255_init(dev, dev->subdevices + i,
+				subdev_8255mapped_cb,
+				(unsigned long)(dev->iobase + i * 0x1000));
+		} else
+			subdev_8255_init(dev, dev->subdevices + i,
+				subdev_8255_cb,
+				(unsigned long)(dev->iobase + SIZE_8255 * i));
+	};
+
+	return 0;
+}
+
+static int pcl724_detach(comedi_device * dev)
+{
+	int i;
+
+//      printk("comedi%d: pcl724: remove\n",dev->minor);
+
+	for (i = 0; i < dev->n_subdevices; i++) {
+		subdev_8255_cleanup(dev, dev->subdevices + i);
+	}
+
+#ifdef PCL724_IRQ
+	if (dev->irq) {
+		comedi_free_irq(dev->irq, dev);
+	}
+#endif
+
+	release_region(dev->iobase, this_board->io_range);
+
+	return 0;
+}