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>

diff --git a/drivers/staging/comedi/drivers/dt2815.c b/drivers/staging/comedi/drivers/dt2815.c
new file mode 100644 (file)
index 0000000..7c0462d
--- /dev/null
+++ b/drivers/staging/comedi/drivers/dt2815.c
@@ -0,0 +1,262 @@
+/*
+   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;
+}