Staging: comedi: add aio_aio12_8 driver

Diver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board

From: Pablo Mejia <pablo.mejia@cctechnol.com>
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/aio_aio12_8.c

+/*
+
+    comedi/drivers/aio_aio12_8.c
+
+    Driver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board
+    Copyright (C) 2006 C&C Technologies, Inc.
+
+    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: aio_aio12_8
+Description: Acces I/O Products PC-104 AIO12-8 Analog I/O Board
+Author: Pablo Mejia <pablo.mejia@cctechnol.com>
+Devices:
+ [Acces I/O] PC-104 AIO12-8
+Status: experimental
+
+Configuration Options:
+  [0] - I/O port base address
+
+Notes:
+
+  Only synchronous operations are supported.
+
+*/
+
+#include "../comedidev.h"
+#include <linux/ioport.h>
+#include "8255.h"
+
+#define AIO12_8_STATUS			0x00
+#define AIO12_8_INTERRUPT		0x01
+#define AIO12_8_ADC			0x02
+#define AIO12_8_DAC_0			0x04
+#define AIO12_8_DAC_1			0x06
+#define AIO12_8_DAC_2			0x08
+#define AIO12_8_DAC_3			0x0A
+#define AIO12_8_COUNTER_0		0x0C
+#define AIO12_8_COUNTER_1		0x0D
+#define AIO12_8_COUNTER_2		0x0E
+#define AIO12_8_COUNTER_CONTROL		0x0F
+#define AIO12_8_DIO_0			0x10
+#define AIO12_8_DIO_1			0x11
+#define AIO12_8_DIO_2			0x12
+#define AIO12_8_DIO_STATUS		0x13
+#define AIO12_8_DIO_CONTROL		0x14
+#define AIO12_8_ADC_TRIGGER_CONTROL	0x15
+#define AIO12_8_TRIGGER			0x16
+#define AIO12_8_POWER			0x17
+
+#define STATUS_ADC_EOC			0x80
+
+#define ADC_MODE_NORMAL			0x00
+#define ADC_MODE_INTERNAL_CLOCK		0x40
+#define ADC_MODE_STANDBY		0x80
+#define ADC_MODE_POWERDOWN		0xC0
+
+#define DAC_ENABLE			0x18
+
+typedef struct {
+	const char *name;
+} board_type;
+
+static const board_type board_types[] = {
+	{
+      name:	"aio_aio12_8"},
+};
+
+#define	thisboard	((const board_type *) dev->board_ptr)
+
+typedef struct {
+	lsampl_t ao_readback[4];
+} aio12_8_private;
+
+#define devpriv	((aio12_8_private *) dev->private)
+
+static int aio_aio12_8_ai_read(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	unsigned char control =
+		ADC_MODE_NORMAL |
+		(CR_RANGE(insn->chanspec) << 3) | CR_CHAN(insn->chanspec);
+
+	//read status to clear EOC latch
+	inb(dev->iobase + AIO12_8_STATUS);
+
+	for (n = 0; n < insn->n; n++) {
+		int timeout = 5;
+
+		// Setup and start conversion
+		outb(control, dev->iobase + AIO12_8_ADC);
+
+		// Wait for conversion to complete
+		while (timeout &&
+			!(inb(dev->iobase + AIO12_8_STATUS) & STATUS_ADC_EOC)) {
+			timeout--;
+			printk("timeout %d\n", timeout);
+			comedi_udelay(1);
+		}
+		if (timeout == 0) {
+			comedi_error(dev, "ADC timeout");
+			return -EIO;
+		}
+
+		data[n] = inw(dev->iobase + AIO12_8_ADC) & 0x0FFF;
+	}
+	return n;
+}
+
+static int aio_aio12_8_ao_read(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int i;
+	int val = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
+
+	for (i = 0; i < insn->n; i++)
+		data[i] = val;
+	return insn->n;
+}
+
+static int aio_aio12_8_ao_write(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int i;
+	int chan = CR_CHAN(insn->chanspec);
+	unsigned long port = dev->iobase + AIO12_8_DAC_0 + (2 * chan);
+
+	//enable DACs
+	outb(0x01, dev->iobase + DAC_ENABLE);
+
+	for (i = 0; i < insn->n; i++) {
+		outb(data[i] & 0xFF, port);	// LSB
+		outb((data[i] >> 8) & 0x0F, port + 1);	// MSB
+		devpriv->ao_readback[chan] = data[i];
+	}
+	return insn->n;
+}
+
+static const comedi_lrange range_aio_aio12_8 = {
+	4,
+	{
+			UNI_RANGE(5),
+			BIP_RANGE(5),
+			UNI_RANGE(10),
+			BIP_RANGE(10),
+		}
+};
+
+static int aio_aio12_8_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	int iobase;
+	comedi_subdevice *s;
+
+	iobase = it->options[0];
+	if (!request_region(iobase, 24, "aio_aio12_8")) {
+		printk("I/O port conflict");
+		return -EIO;
+	}
+
+	dev->board_name = thisboard->name;
+
+	dev->iobase = iobase;
+
+	if (alloc_private(dev, sizeof(aio12_8_private)) < 0)
+		return -ENOMEM;
+
+	if (alloc_subdevices(dev, 3) < 0)
+		return -ENOMEM;
+
+	s = &dev->subdevices[0];
+	s->type = COMEDI_SUBD_AI;
+	s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
+	s->n_chan = 8;
+	s->maxdata = (1 << 12) - 1;
+	s->range_table = &range_aio_aio12_8;
+	s->insn_read = aio_aio12_8_ai_read;
+
+	s = &dev->subdevices[1];
+	s->type = COMEDI_SUBD_AO;
+	s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
+	s->n_chan = 4;
+	s->maxdata = (1 << 12) - 1;
+	s->range_table = &range_aio_aio12_8;
+	s->insn_read = aio_aio12_8_ao_read;
+	s->insn_write = aio_aio12_8_ao_write;
+
+	s = &dev->subdevices[2];
+	subdev_8255_init(dev, s, NULL, dev->iobase + AIO12_8_DIO_0);
+
+	return 0;
+}
+
+static int aio_aio12_8_detach(comedi_device * dev)
+{
+	subdev_8255_cleanup(dev, &dev->subdevices[2]);
+	if (dev->iobase)
+		release_region(dev->iobase, 24);
+	return 0;
+}
+
+static comedi_driver driver_aio_aio12_8 = {
+      driver_name:"aio_aio12_8",
+      module:THIS_MODULE,
+      attach:aio_aio12_8_attach,
+      detach:aio_aio12_8_detach,
+      board_name:&board_types[0].name,
+      num_names:1,
+      offset:sizeof(board_type),
+};
+
+COMEDI_INITCLEANUP(driver_aio_aio12_8);