Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / comedi / drivers / dt2817.c

diff --git a/kernel/drivers/staging/comedi/drivers/dt2817.c b/kernel/drivers/staging/comedi/drivers/dt2817.c
new file mode 100644 (file)
index 0000000..5131dee
--- /dev/null
+++ b/kernel/drivers/staging/comedi/drivers/dt2817.c
@@ -0,0 +1,149 @@
+/*
+    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.
+*/
+/*
+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 <linux/module.h>
+#include "../comedidev.h"
+
+#define DT2817_CR 0
+#define DT2817_DATA 1
+
+static int dt2817_dio_insn_config(struct comedi_device *dev,
+                                 struct comedi_subdevice *s,
+                                 struct comedi_insn *insn,
+                                 unsigned int *data)
+{
+       unsigned int chan = CR_CHAN(insn->chanspec);
+       unsigned int oe = 0;
+       unsigned int mask;
+       int ret;
+
+       if (chan < 8)
+               mask = 0x000000ff;
+       else if (chan < 16)
+               mask = 0x0000ff00;
+       else if (chan < 24)
+               mask = 0x00ff0000;
+       else
+               mask = 0xff000000;
+
+       ret = comedi_dio_insn_config(dev, s, insn, data, mask);
+       if (ret)
+               return ret;
+
+       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 insn->n;
+}
+
+static int dt2817_dio_insn_bits(struct comedi_device *dev,
+                               struct comedi_subdevice *s,
+                               struct comedi_insn *insn,
+                               unsigned int *data)
+{
+       unsigned long iobase = dev->iobase + DT2817_DATA;
+       unsigned int mask;
+       unsigned int val;
+
+       mask = comedi_dio_update_state(s, data);
+       if (mask) {
+               if (mask & 0x000000ff)
+                       outb(s->state & 0xff, iobase + 0);
+               if (mask & 0x0000ff00)
+                       outb((s->state >> 8) & 0xff, iobase + 1);
+               if (mask & 0x00ff0000)
+                       outb((s->state >> 16) & 0xff, iobase + 2);
+               if (mask & 0xff000000)
+                       outb((s->state >> 24) & 0xff, iobase + 3);
+       }
+
+       val = inb(iobase + 0);
+       val |= (inb(iobase + 1) << 8);
+       val |= (inb(iobase + 2) << 16);
+       val |= (inb(iobase + 3) << 24);
+
+       data[1] = val;
+
+       return insn->n;
+}
+
+static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+       int ret;
+       struct comedi_subdevice *s;
+
+       ret = comedi_request_region(dev, it->options[0], 0x5);
+       if (ret)
+               return ret;
+
+       ret = comedi_alloc_subdevices(dev, 1);
+       if (ret)
+               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);
+
+       return 0;
+}
+
+static struct comedi_driver dt2817_driver = {
+       .driver_name    = "dt2817",
+       .module         = THIS_MODULE,
+       .attach         = dt2817_attach,
+       .detach         = comedi_legacy_detach,
+};
+module_comedi_driver(dt2817_driver);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_LICENSE("GPL");