Staging: comedi: add dt2817 driver

Driver for DataTranslation DT2817

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>

diff --git a/drivers/staging/comedi/drivers/dt2817.c b/drivers/staging/comedi/drivers/dt2817.c
new file mode 100644 (file)
index 0000000..d7a5285
--- /dev/null
+++ b/drivers/staging/comedi/drivers/dt2817.c
@@ -0,0 +1,178 @@
+/*
+    comedi/drivers/dt2817.c
+    Hardware driver for Data Translation DT2817
+
+    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: dt2817
+Description: Data Translation DT2817
+Author: ds
+Status: complete
+Devices: [Data Translation] DT2817 (dt2817)
+
+A very simple digital I/O card.  Four banks of 8 lines, each bank
+is configurable for input or output.  One wonders why it takes a
+50 page manual to describe this thing.
+
+The driver (which, btw, is much less than 50 pages) has 1 subdevice
+with 32 channels, configurable in groups of 8.
+
+Configuration options:
+  [0] - I/O port base base address
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+
+#define DT2817_SIZE 5
+
+#define DT2817_CR 0
+#define DT2817_DATA 1
+
+static int dt2817_attach(comedi_device * dev, comedi_devconfig * it);
+static int dt2817_detach(comedi_device * dev);
+static comedi_driver driver_dt2817 = {
+      driver_name:"dt2817",
+      module:THIS_MODULE,
+      attach:dt2817_attach,
+      detach:dt2817_detach,
+};
+
+COMEDI_INITCLEANUP(driver_dt2817);
+
+static int dt2817_dio_insn_config(comedi_device * dev, comedi_subdevice * s,
+       comedi_insn * insn, lsampl_t * data)
+{
+       int mask;
+       int chan;
+       int oe = 0;
+
+       if (insn->n != 1)
+               return -EINVAL;
+
+       chan = CR_CHAN(insn->chanspec);
+       if (chan < 8) {
+               mask = 0xff;
+       } else if (chan < 16) {
+               mask = 0xff00;
+       } else if (chan < 24) {
+               mask = 0xff0000;
+       } else
+               mask = 0xff000000;
+       if (data[0])
+               s->io_bits |= mask;
+       else
+               s->io_bits &= ~mask;
+
+       if (s->io_bits & 0x000000ff)
+               oe |= 0x1;
+       if (s->io_bits & 0x0000ff00)
+               oe |= 0x2;
+       if (s->io_bits & 0x00ff0000)
+               oe |= 0x4;
+       if (s->io_bits & 0xff000000)
+               oe |= 0x8;
+
+       outb(oe, dev->iobase + DT2817_CR);
+
+       return 1;
+}
+
+static int dt2817_dio_insn_bits(comedi_device * dev, comedi_subdevice * s,
+       comedi_insn * insn, lsampl_t * data)
+{
+       unsigned int changed;
+
+       /* It's questionable whether it is more important in
+        * a driver like this to be deterministic or fast.
+        * We choose fast. */
+
+       if (data[0]) {
+               changed = s->state;
+               s->state &= ~data[0];
+               s->state |= (data[0] & data[1]);
+               changed ^= s->state;
+               changed &= s->io_bits;
+               if (changed & 0x000000ff)
+                       outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0);
+               if (changed & 0x0000ff00)
+                       outb((s->state >> 8) & 0xff,
+                               dev->iobase + DT2817_DATA + 1);
+               if (changed & 0x00ff0000)
+                       outb((s->state >> 16) & 0xff,
+                               dev->iobase + DT2817_DATA + 2);
+               if (changed & 0xff000000)
+                       outb((s->state >> 24) & 0xff,
+                               dev->iobase + DT2817_DATA + 3);
+       }
+       data[1] = inb(dev->iobase + DT2817_DATA + 0);
+       data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8);
+       data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16);
+       data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24);
+
+       return 2;
+}
+
+static int dt2817_attach(comedi_device * dev, comedi_devconfig * it)
+{
+       int ret;
+       comedi_subdevice *s;
+       unsigned long iobase;
+
+       iobase = it->options[0];
+       printk("comedi%d: dt2817: 0x%04lx ", dev->minor, iobase);
+       if (!request_region(iobase, DT2817_SIZE, "dt2817")) {
+               printk("I/O port conflict\n");
+               return -EIO;
+       }
+       dev->iobase = iobase;
+       dev->board_name = "dt2817";
+
+       if ((ret = alloc_subdevices(dev, 1)) < 0)
+               return ret;
+
+       s = dev->subdevices + 0;
+
+       s->n_chan = 32;
+       s->type = COMEDI_SUBD_DIO;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->range_table = &range_digital;
+       s->maxdata = 1;
+       s->insn_bits = dt2817_dio_insn_bits;
+       s->insn_config = dt2817_dio_insn_config;
+
+       s->state = 0;
+       outb(0, dev->iobase + DT2817_CR);
+
+       printk("\n");
+
+       return 0;
+}
+
+static int dt2817_detach(comedi_device * dev)
+{
+       printk("comedi%d: dt2817: remove\n", dev->minor);
+
+       if (dev->iobase)
+               release_region(dev->iobase, DT2817_SIZE);
+
+       return 0;
+}