Staging: comedi: add pcl726 driver

Driver for Advantech PCL-726 & 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/pcl726.c

+/*
+    comedi/drivers/pcl726.c
+
+    hardware driver for Advantech cards:
+     card:   PCL-726, PCL-727, PCL-728
+     driver: pcl726,  pcl727,  pcl728
+    and for ADLink cards:
+     card:   ACL-6126, ACL-6128
+     driver: acl6126,  acl6128
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1998 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: pcl726
+Description: Advantech PCL-726 & compatibles
+Author: ds
+Status: untested
+Devices: [Advantech] PCL-726 (pcl726), PCL-727 (pcl727), PCL-728 (pcl728),
+  [ADLink] ACL-6126 (acl6126), ACL-6128 (acl6128)
+
+Interrupts are not supported.
+
+    Options for PCL-726:
+     [0] - IO Base
+     [2]...[7] - D/A output range for channel 1-6:
+               0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
+	       4: 4-20mA, 5: unknown (external reference)
+
+    Options for PCL-727:
+     [0] - IO Base
+     [2]...[13] - D/A output range for channel 1-12:
+               0: 0-5V, 1: 0-10V, 2: +/-5V,
+	       3: 4-20mA
+
+    Options for PCL-728 and ACL-6128:
+     [0] - IO Base
+     [2], [3] - D/A output range for channel 1 and 2:
+               0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
+	       4: 4-20mA, 5: 0-20mA
+
+    Options for ACL-6126:
+     [0] - IO Base
+     [1] - IRQ (0=disable, 3, 5, 6, 7, 9, 10, 11, 12, 15) (currently ignored)
+     [2]...[7] - D/A output range for channel 1-6:
+               0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
+	       4: 4-20mA
+*/
+
+/*
+    Thanks to Circuit Specialists for having programming info (!) on
+    their web page.  (http://www.cir.com/)
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+
+#undef ACL6126_IRQ		/* no interrupt support (yet) */
+
+#define PCL726_SIZE 16
+#define PCL727_SIZE 32
+#define PCL728_SIZE 8
+
+#define PCL726_DAC0_HI 0
+#define PCL726_DAC0_LO 1
+
+#define PCL726_DO_HI 12
+#define PCL726_DO_LO 13
+#define PCL726_DI_HI 14
+#define PCL726_DI_LO 15
+
+#define PCL727_DO_HI 24
+#define PCL727_DO_LO 25
+#define PCL727_DI_HI  0
+#define PCL727_DI_LO  1
+
+static const comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
+static const comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
+
+static const comedi_lrange *const rangelist_726[] = {
+	&range_unipolar5, &range_unipolar10,
+	&range_bipolar5, &range_bipolar10,
+	&range_4_20mA, &range_unknown
+};
+
+static const comedi_lrange *const rangelist_727[] = {
+	&range_unipolar5, &range_unipolar10,
+	&range_bipolar5,
+	&range_4_20mA
+};
+
+static const comedi_lrange *const rangelist_728[] = {
+	&range_unipolar5, &range_unipolar10,
+	&range_bipolar5, &range_bipolar10,
+	&range_4_20mA, &range_0_20mA
+};
+
+static int pcl726_attach(comedi_device * dev, comedi_devconfig * it);
+static int pcl726_detach(comedi_device * dev);
+
+typedef struct {
+	const char *name;	// driver name
+	int n_aochan;		// num of D/A chans
+	int num_of_ranges;	// num of ranges
+	unsigned int IRQbits;	// allowed interrupts
+	unsigned int io_range;	// len of IO space
+	char have_dio;		// 1=card have DI/DO ports
+	int di_hi;		// ports for DI/DO operations
+	int di_lo;
+	int do_hi;
+	int do_lo;
+	const comedi_lrange *const *range_type_list;	// list of supported ranges
+} boardtype;
+
+static const boardtype boardtypes[] = {
+	{"pcl726", 6, 6, 0x0000, PCL726_SIZE, 1,
+			PCL726_DI_HI, PCL726_DI_LO, PCL726_DO_HI, PCL726_DO_LO,
+		&rangelist_726[0],},
+	{"pcl727", 12, 4, 0x0000, PCL727_SIZE, 1,
+			PCL727_DI_HI, PCL727_DI_LO, PCL727_DO_HI, PCL727_DO_LO,
+		&rangelist_727[0],},
+	{"pcl728", 2, 6, 0x0000, PCL728_SIZE, 0,
+			0, 0, 0, 0,
+		&rangelist_728[0],},
+	{"acl6126", 6, 5, 0x96e8, PCL726_SIZE, 1,
+			PCL726_DI_HI, PCL726_DI_LO, PCL726_DO_HI, PCL726_DO_LO,
+		&rangelist_726[0],},
+	{"acl6128", 2, 6, 0x0000, PCL728_SIZE, 0,
+			0, 0, 0, 0,
+		&rangelist_728[0],},
+};
+
+#define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))
+#define this_board ((const boardtype *)dev->board_ptr)
+
+static comedi_driver driver_pcl726 = {
+      driver_name:"pcl726",
+      module:THIS_MODULE,
+      attach:pcl726_attach,
+      detach:pcl726_detach,
+      board_name:&boardtypes[0].name,
+      num_names:n_boardtypes,
+      offset:sizeof(boardtype),
+};
+
+COMEDI_INITCLEANUP(driver_pcl726);
+
+typedef struct {
+	int bipolar[12];
+	const comedi_lrange *rangelist[12];
+	lsampl_t ao_readback[12];
+} pcl726_private;
+#define devpriv ((pcl726_private *)dev->private)
+
+static int pcl726_ao_insn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int hi, lo;
+	int n;
+	int chan = CR_CHAN(insn->chanspec);
+
+	for (n = 0; n < insn->n; n++) {
+		lo = data[n] & 0xff;
+		hi = (data[n] >> 8) & 0xf;
+		if (devpriv->bipolar[chan])
+			hi ^= 0x8;
+		/*
+		 * the programming info did not say which order
+		 * to write bytes.  switch the order of the next
+		 * two lines if you get glitches.
+		 */
+		outb(hi, dev->iobase + PCL726_DAC0_HI + 2 * chan);
+		outb(lo, dev->iobase + PCL726_DAC0_LO + 2 * chan);
+		devpriv->ao_readback[chan] = data[n];
+	}
+
+	return n;
+}
+
+static int pcl726_ao_insn_read(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int chan = CR_CHAN(insn->chanspec);
+	int n;
+
+	for (n = 0; n < insn->n; n++) {
+		data[n] = devpriv->ao_readback[chan];
+	}
+	return n;
+}
+
+static int pcl726_di_insn_bits(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	if (insn->n != 2)
+		return -EINVAL;
+
+	data[1] = inb(dev->iobase + this_board->di_lo) |
+		(inb(dev->iobase + this_board->di_hi) << 8);
+
+	return 2;
+}
+
+static int pcl726_do_insn_bits(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[1] & 0x00ff)
+		outb(s->state & 0xff, dev->iobase + this_board->do_lo);
+	if (data[1] & 0xff00)
+		outb((s->state >> 8), dev->iobase + this_board->do_hi);
+
+	data[1] = s->state;
+
+	return 2;
+}
+
+static int pcl726_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *s;
+	unsigned long iobase;
+	unsigned int iorange;
+	int ret, i;
+#ifdef ACL6126_IRQ
+	unsigned int irq;
+#endif
+
+	iobase = it->options[0];
+	iorange = this_board->io_range;
+	printk("comedi%d: pcl726: board=%s, 0x%03lx ", dev->minor,
+		this_board->name, iobase);
+	if (!request_region(iobase, iorange, "pcl726")) {
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+
+	dev->iobase = iobase;
+
+	dev->board_name = this_board->name;
+
+	if ((ret = alloc_private(dev, sizeof(pcl726_private))) < 0)
+		return -ENOMEM;
+
+	for (i = 0; i < 12; i++) {
+		devpriv->bipolar[i] = 0;
+		devpriv->rangelist[i] = &range_unknown;
+	}
+
+#ifdef ACL6126_IRQ
+	irq = 0;
+	if (boardtypes[board].IRQbits != 0) {	/* board support IRQ */
+		irq = it->options[1];
+		devpriv->first_chan = 2;
+		if (irq) {	/* we want to use IRQ */
+			if (((1 << irq) & boardtypes[board].IRQbits) == 0) {
+				rt_printk
+					(", IRQ %d is out of allowed range, DISABLING IT",
+					irq);
+				irq = 0;	/* Bad IRQ */
+			} else {
+				if (comedi_request_irq(irq, interrupt_pcl818, 0,
+						"pcl726", dev)) {
+					rt_printk
+						(", unable to allocate IRQ %d, DISABLING IT",
+						irq);
+					irq = 0;	/* Can't use IRQ */
+				} else {
+					rt_printk(", irq=%d", irq);
+				}
+			}
+		}
+	}
+
+	dev->irq = irq;
+#endif
+
+	printk("\n");
+
+	if ((ret = alloc_subdevices(dev, 3)) < 0)
+		return ret;
+
+	s = dev->subdevices + 0;
+	/* ao */
+	s->type = COMEDI_SUBD_AO;
+	s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
+	s->n_chan = this_board->n_aochan;
+	s->maxdata = 0xfff;
+	s->len_chanlist = 1;
+	s->insn_write = pcl726_ao_insn;
+	s->insn_read = pcl726_ao_insn_read;
+	s->range_table_list = devpriv->rangelist;
+	for (i = 0; i < this_board->n_aochan; i++) {
+		int j;
+
+		j = it->options[2 + 1];
+		if ((j < 0) || (j >= this_board->num_of_ranges)) {
+			printk("Invalid range for channel %d! Must be 0<=%d<%d\n", i, j, this_board->num_of_ranges - 1);
+			j = 0;
+		}
+		devpriv->rangelist[i] = this_board->range_type_list[j];
+		if (devpriv->rangelist[i]->range[0].min ==
+			-devpriv->rangelist[i]->range[0].max)
+			devpriv->bipolar[i] = 1;	/* bipolar range */
+	}
+
+	s = dev->subdevices + 1;
+	/* di */
+	if (!this_board->have_dio) {
+		s->type = COMEDI_SUBD_UNUSED;
+	} else {
+		s->type = COMEDI_SUBD_DI;
+		s->subdev_flags = SDF_READABLE | SDF_GROUND;
+		s->n_chan = 16;
+		s->maxdata = 1;
+		s->len_chanlist = 1;
+		s->insn_bits = pcl726_di_insn_bits;
+		s->range_table = &range_digital;
+	}
+
+	s = dev->subdevices + 2;
+	/* do */
+	if (!this_board->have_dio) {
+		s->type = COMEDI_SUBD_UNUSED;
+	} else {
+		s->type = COMEDI_SUBD_DO;
+		s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
+		s->n_chan = 16;
+		s->maxdata = 1;
+		s->len_chanlist = 1;
+		s->insn_bits = pcl726_do_insn_bits;
+		s->range_table = &range_digital;
+	}
+
+	return 0;
+}
+
+static int pcl726_detach(comedi_device * dev)
+{
+//      printk("comedi%d: pcl726: remove\n",dev->minor);
+
+#ifdef ACL6126_IRQ
+	if (dev->irq) {
+		comedi_free_irq(dev->irq, dev);
+	}
+#endif
+
+	if (dev->iobase)
+		release_region(dev->iobase, this_board->io_range);
+
+	return 0;
+}