Staging: comedi: add mpc8260 driver

driver for digital I/O pins on the MPC 8260 CPM module

From: 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/mpc8260cpm.c

+/*
+    comedi/drivers/mpc8260.c
+    driver for digital I/O pins on the MPC 8260 CPM module
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 2000,2001 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: mpc8260cpm
+Description: MPC8260 CPM module generic digital I/O lines
+Devices: [Motorola] MPC8260 CPM (mpc8260cpm)
+Author: ds
+Status: experimental
+Updated: Sat, 16 Mar 2002 17:34:48 -0800
+
+This driver is specific to the Motorola MPC8260 processor, allowing
+you to access the processor's generic digital I/O lines.
+
+It is apparently missing some code.
+*/
+
+#include "../comedidev.h"
+
+extern unsigned long mpc8260_dio_reserved[4];
+
+typedef struct {
+	int data;
+
+} mpc8260cpm_private;
+#define devpriv ((mpc8260cpm_private *)dev->private)
+
+static int mpc8260cpm_attach(comedi_device * dev, comedi_devconfig * it);
+static int mpc8260cpm_detach(comedi_device * dev);
+static comedi_driver driver_mpc8260cpm = {
+      driver_name:"mpc8260cpm",
+      module:THIS_MODULE,
+      attach:mpc8260cpm_attach,
+      detach:mpc8260cpm_detach,
+};
+
+COMEDI_INITCLEANUP(driver_mpc8260cpm);
+
+static int mpc8260cpm_dio_config(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data);
+static int mpc8260cpm_dio_bits(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data);
+
+static int mpc8260cpm_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_subdevice *s;
+	int i;
+
+	printk("comedi%d: mpc8260cpm: ", dev->minor);
+
+	dev->board_ptr = mpc8260cpm_boards + dev->board;
+
+	dev->board_name = thisboard->name;
+
+	if (alloc_private(dev, sizeof(mpc8260cpm_private)) < 0)
+		return -ENOMEM;
+
+	if (alloc_subdevices(dev, 4) < 0)
+		return -ENOMEM;
+
+	for (i = 0; i < 4; i++) {
+		s = dev->subdevices + i;
+		s->type = COMEDI_SUBD_DIO;
+		s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+		s->n_chan = 32;
+		s->maxdata = 1;
+		s->range_table = &range_digital;
+		s->insn_config = mpc8260cpm_dio_config;
+		s->insn_bits = mpc8260cpm_dio_bits;
+	}
+
+	return 1;
+}
+
+static int mpc8260cpm_detach(comedi_device * dev)
+{
+	printk("comedi%d: mpc8260cpm: remove\n", dev->minor);
+
+	return 0;
+}
+
+static unsigned long *cpm_pdat(int port)
+{
+	switch (port) {
+	case 0:
+		return &io->iop_pdata;
+	case 1:
+		return &io->iop_pdatb;
+	case 2:
+		return &io->iop_pdatc;
+	case 3:
+		return &io->iop_pdatd;
+	}
+}
+
+static int mpc8260cpm_dio_config(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	unsigned int d;
+	unsigned int mask;
+	int port;
+
+	port = (int)s->private;
+	mask = 1 << CR_CHAN(insn->chanspec);
+	if (mask & cpm_reserved_bits[port]) {
+		return -EINVAL;
+	}
+
+	switch (data[0]) {
+	case INSN_CONFIG_DIO_OUTPUT:
+		s->io_bits |= mask;
+		break;
+	case INSN_CONFIG_DIO_INPUT:
+		s->io_bits &= ~mask;
+		break;
+	case INSN_CONFIG_DIO_QUERY:
+		data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
+		return insn->n;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (port) {
+	case 0:
+		return &io->iop_pdira;
+	case 1:
+		return &io->iop_pdirb;
+	case 2:
+		return &io->iop_pdirc;
+	case 3:
+		return &io->iop_pdird;
+	}
+
+	return 1;
+}
+
+static int mpc8260cpm_dio_bits(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	int port;
+	unsigned long *p;
+
+	p = cpm_pdat((int)s->private);
+
+	return 2;
+}