Staging: comedi: add dt2815 driver

Driver for DataTranslation DT2815

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/dt2815.c

+/*
+   comedi/drivers/dt2815.c
+   Hardware driver for Data Translation DT2815
+
+   COMEDI - Linux Control and Measurement Device Interface
+   Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
+
+   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: dt2815
+Description: Data Translation DT2815
+Author: ds
+Status: mostly complete, untested
+Devices: [Data Translation] DT2815 (dt2815)
+
+I'm not sure anyone has ever tested this board.  If you have information
+contrary, please update.
+
+Configuration options:
+  [0] - I/O port base base address
+  [1] - IRQ (unused)
+  [2] - Voltage unipolar/bipolar configuration
+          0 == unipolar 5V  (0V -- +5V)
+	  1 == bipolar 5V  (-5V -- +5V)
+  [3] - Current offset configuration
+          0 == disabled  (0mA -- +32mAV)
+          1 == enabled  (+4mA -- +20mAV)
+  [4] - Firmware program configuration
+          0 == program 1 (see manual table 5-4)
+          1 == program 2 (see manual table 5-4)
+          2 == program 3 (see manual table 5-4)
+          3 == program 4 (see manual table 5-4)
+  [5] - Analog output 0 range configuration
+          0 == voltage
+          1 == current
+  [6] - Analog output 1 range configuration (same options)
+  [7] - Analog output 2 range configuration (same options)
+  [8] - Analog output 3 range configuration (same options)
+  [9] - Analog output 4 range configuration (same options)
+  [10] - Analog output 5 range configuration (same options)
+  [11] - Analog output 6 range configuration (same options)
+  [12] - Analog output 7 range configuration (same options)
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <linux/delay.h>
+
+static const comedi_lrange range_dt2815_ao_32_current = { 1, {
+			RANGE_mA(0, 32)
+	}
+};
+static const comedi_lrange range_dt2815_ao_20_current = { 1, {
+			RANGE_mA(4, 20)
+	}
+};
+
+#define DT2815_SIZE 2
+
+#define DT2815_DATA 0
+#define DT2815_STATUS 1
+
+static int dt2815_attach(comedi_device * dev, comedi_devconfig * it);
+static int dt2815_detach(comedi_device * dev);
+static comedi_driver driver_dt2815 = {
+      driver_name:"dt2815",
+      module:THIS_MODULE,
+      attach:dt2815_attach,
+      detach:dt2815_detach,
+};
+
+COMEDI_INITCLEANUP(driver_dt2815);
+
+static void dt2815_free_resources(comedi_device * dev);
+
+typedef struct {
+	const comedi_lrange *range_type_list[8];
+	lsampl_t ao_readback[8];
+} dt2815_private;
+
+#define devpriv ((dt2815_private *)dev->private)
+
+static int dt2815_wait_for_status(comedi_device * dev, int status)
+{
+	int i;
+
+	for (i = 0; i < 100; i++) {
+		if (inb(dev->iobase + DT2815_STATUS) == status)
+			break;
+	}
+	return status;
+}
+
+static int dt2815_ao_insn_read(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int i;
+	int chan = CR_CHAN(insn->chanspec);
+
+	for (i = 0; i < insn->n; i++) {
+		data[i] = devpriv->ao_readback[chan];
+	}
+
+	return i;
+}
+
+static int dt2815_ao_insn(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int i;
+	int chan = CR_CHAN(insn->chanspec);
+	unsigned int status;
+	unsigned int lo, hi;
+
+	for (i = 0; i < insn->n; i++) {
+		lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
+		hi = (data[i] & 0xff0) >> 4;
+
+		status = dt2815_wait_for_status(dev, 0x00);
+		if (status != 0) {
+			rt_printk
+				("dt2815: failed to write low byte on %d reason %x\n",
+				chan, status);
+			return -EBUSY;
+		}
+
+		outb(lo, dev->iobase + DT2815_DATA);
+
+		status = dt2815_wait_for_status(dev, 0x10);
+		if (status != 0x10) {
+			rt_printk
+				("dt2815: failed to write high byte on %d reason %x\n",
+				chan, status);
+			return -EBUSY;
+		}
+		devpriv->ao_readback[chan] = data[i];
+	}
+	return i;
+}
+
+/*
+  options[0]   Board base address
+  options[1]   IRQ (not applicable)
+  options[2]   Voltage unipolar/bipolar configuration
+                 0 == unipolar 5V  (0V -- +5V)
+		 1 == bipolar 5V  (-5V -- +5V)
+  options[3]   Current offset configuration
+                 0 == disabled  (0mA -- +32mAV)
+                 1 == enabled  (+4mA -- +20mAV)
+  options[4]   Firmware program configuration
+                 0 == program 1 (see manual table 5-4)
+                 1 == program 2 (see manual table 5-4)
+                 2 == program 3 (see manual table 5-4)
+                 3 == program 4 (see manual table 5-4)
+  options[5]   Analog output 0 range configuration
+                 0 == voltage
+                 1 == current
+  options[6]   Analog output 1 range configuration
+  ...
+  options[12]   Analog output 7 range configuration
+                 0 == voltage
+                 1 == current
+ */
+
+static int dt2815_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *s;
+	int i;
+	const comedi_lrange *current_range_type, *voltage_range_type;
+	unsigned long iobase;
+
+	iobase = it->options[0];
+	printk("comedi%d: dt2815: 0x%04lx ", dev->minor, iobase);
+	if (!request_region(iobase, DT2815_SIZE, "dt2815")) {
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+
+	dev->iobase = iobase;
+	dev->board_name = "dt2815";
+
+	if (alloc_subdevices(dev, 1) < 0)
+		return -ENOMEM;
+	if (alloc_private(dev, sizeof(dt2815_private)) < 0)
+		return -ENOMEM;
+
+	s = dev->subdevices;
+	/* ao subdevice */
+	s->type = COMEDI_SUBD_AO;
+	s->subdev_flags = SDF_WRITABLE;
+	s->maxdata = 0xfff;
+	s->n_chan = 8;
+	s->insn_write = dt2815_ao_insn;
+	s->insn_read = dt2815_ao_insn_read;
+	s->range_table_list = devpriv->range_type_list;
+
+	current_range_type = (it->options[3])
+		? &range_dt2815_ao_20_current : &range_dt2815_ao_32_current;
+	voltage_range_type = (it->options[2])
+		? &range_bipolar5 : &range_unipolar5;
+	for (i = 0; i < 8; i++) {
+		devpriv->range_type_list[i] = (it->options[5 + i])
+			? current_range_type : voltage_range_type;
+	}
+
+	/* Init the 2815 */
+	outb(0x00, dev->iobase + DT2815_STATUS);
+	for (i = 0; i < 100; i++) {
+		/* This is incredibly slow (approx 20 ms) */
+		unsigned int status;
+
+		comedi_udelay(1000);
+		status = inb(dev->iobase + DT2815_STATUS);
+		if (status == 4) {
+			unsigned int program;
+			program = (it->options[4] & 0x3) << 3 | 0x7;
+			outb(program, dev->iobase + DT2815_DATA);
+			printk(", program: 0x%x (@t=%d)\n", program, i);
+			break;
+		} else if (status != 0x00) {
+			printk("dt2815: unexpected status 0x%x (@t=%d)\n",
+				status, i);
+			if (status & 0x60) {
+				outb(0x00, dev->iobase + DT2815_STATUS);
+			}
+		}
+	}
+
+	printk("\n");
+
+	return 0;
+}
+
+static void dt2815_free_resources(comedi_device * dev)
+{
+	if (dev->iobase)
+		release_region(dev->iobase, DT2815_SIZE);
+}
+
+static int dt2815_detach(comedi_device * dev)
+{
+	printk("comedi%d: dt2815: remove\n", dev->minor);
+
+	dt2815_free_resources(dev);
+
+	return 0;
+}