Staging: comedi: add kcomedilib to the tree

This adds the kcomedilib 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/Makefile

@@ -1,6 +1,8 @@
 obj-$(CONFIG_COMEDI) += comedi.o
 obj-$(CONFIG_COMEDI_RT) += comedi_rt.o
 
+obj-$(CONFIG_COMEDI)	+= kcomedilib/
+
 comedi-objs :=		\
 	comedi_fops.o	\
 	proc.o		\

drivers/staging/comedi/kcomedilib/Makefile

@@ -0,0 +1,8 @@
+obj-$(CONFIG_COMEDI)	+= kcomedilib.o
+
+kcomedilib-objs :=				\
+			data.o			\
+			ksyms.o			\
+			dio.o			\
+			kcomedilib_main.o	\
+			get.o

drivers/staging/comedi/kcomedilib/data.c

@@ -0,0 +1,89 @@
+/*
+    kcomedilib/data.c
+    implements comedi_data_*() functions
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 2000 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.
+
+*/
+
+#include "../comedi.h"
+#include "../comedilib.h"
+#include "../comedidev.h"	/* for comedi_udelay() */
+
+#include <linux/string.h>
+
+int comedi_data_write(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t data)
+{
+	comedi_insn insn;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_WRITE;
+	insn.n = 1;
+	insn.data = &data;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, range, aref);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_data_read(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t * data)
+{
+	comedi_insn insn;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_READ;
+	insn.n = 1;
+	insn.data = data;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, range, aref);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_data_read_hint(comedi_t * dev, unsigned int subdev,
+	unsigned int chan, unsigned int range, unsigned int aref)
+{
+	comedi_insn insn;
+	lsampl_t dummy_data;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_READ;
+	insn.n = 0;
+	insn.data = &dummy_data;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, range, aref);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_data_read_delayed(comedi_t * dev, unsigned int subdev,
+	unsigned int chan, unsigned int range, unsigned int aref,
+	lsampl_t * data, unsigned int nano_sec)
+{
+	int retval;
+
+	retval = comedi_data_read_hint(dev, subdev, chan, range, aref);
+	if (retval < 0)
+		return retval;
+
+	comedi_udelay((nano_sec + 999) / 1000);
+
+	return comedi_data_read(dev, subdev, chan, range, aref, data);
+}

drivers/staging/comedi/kcomedilib/dio.c

@@ -0,0 +1,95 @@
+/*
+    kcomedilib/dio.c
+    implements comedi_dio_*() functions
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 2000 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.
+
+*/
+
+#include "../comedi.h"
+#include "../comedilib.h"
+
+#include <linux/string.h>
+
+int comedi_dio_config(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int io)
+{
+	comedi_insn insn;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_CONFIG;
+	insn.n = 1;
+	insn.data = &io;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, 0, 0);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_dio_read(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int *val)
+{
+	comedi_insn insn;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_READ;
+	insn.n = 1;
+	insn.data = val;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, 0, 0);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_dio_write(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int val)
+{
+	comedi_insn insn;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_WRITE;
+	insn.n = 1;
+	insn.data = &val;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan, 0, 0);
+
+	return comedi_do_insn(dev, &insn);
+}
+
+int comedi_dio_bitfield(comedi_t * dev, unsigned int subdev, unsigned int mask,
+	unsigned int *bits)
+{
+	comedi_insn insn;
+	lsampl_t data[2];
+	int ret;
+
+	memset(&insn, 0, sizeof(insn));
+	insn.insn = INSN_BITS;
+	insn.n = 2;
+	insn.data = data;
+	insn.subdev = subdev;
+
+	data[0] = mask;
+	data[1] = *bits;
+
+	ret = comedi_do_insn(dev, &insn);
+
+	*bits = data[1];
+
+	return ret;
+}

drivers/staging/comedi/kcomedilib/get.c

@@ -0,0 +1,294 @@
+/*
+    kcomedilib/get.c
+    a comedlib interface for kernel modules
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 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.
+
+*/
+
+#define __NO_VERSION__
+#include "../comedi.h"
+#include "../comedilib.h"
+#include "../comedidev.h"
+
+int comedi_get_n_subdevices(comedi_t * d)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	return dev->n_subdevices;
+}
+
+int comedi_get_version_code(comedi_t * d)
+{
+	return COMEDI_VERSION_CODE;
+}
+
+const char *comedi_get_driver_name(comedi_t * d)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	return dev->driver->driver_name;
+}
+
+const char *comedi_get_board_name(comedi_t * d)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	return dev->board_name;
+}
+
+int comedi_get_subdevice_type(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+
+	return s->type;
+}
+
+unsigned int comedi_get_subdevice_flags(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+
+	return s->subdev_flags;
+}
+
+int comedi_find_subdevice_by_type(comedi_t * d, int type, unsigned int subd)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	if (subd > dev->n_subdevices)
+		return -ENODEV;
+
+	for (; subd < dev->n_subdevices; subd++) {
+		if (dev->subdevices[subd].type == type)
+			return subd;
+	}
+	return -1;
+}
+
+int comedi_get_n_channels(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+
+	return s->n_chan;
+}
+
+int comedi_get_len_chanlist(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+
+	return s->len_chanlist;
+}
+
+lsampl_t comedi_get_maxdata(comedi_t * d, unsigned int subdevice,
+	unsigned int chan)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+
+	if (s->maxdata_list)
+		return s->maxdata_list[chan];
+
+	return s->maxdata;
+}
+
+#ifdef KCOMEDILIB_DEPRECATED
+int comedi_get_rangetype(comedi_t * d, unsigned int subdevice,
+	unsigned int chan)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	int ret;
+
+	if (s->range_table_list) {
+		ret = s->range_table_list[chan]->length;
+	} else {
+		ret = s->range_table->length;
+	}
+
+	ret = ret | (dev->minor << 28) | (subdevice << 24) | (chan << 16);
+
+	return ret;
+}
+#endif
+
+int comedi_get_n_ranges(comedi_t * d, unsigned int subdevice, unsigned int chan)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	int ret;
+
+	if (s->range_table_list) {
+		ret = s->range_table_list[chan]->length;
+	} else {
+		ret = s->range_table->length;
+	}
+
+	return ret;
+}
+
+/*
+ * ALPHA (non-portable)
+*/
+int comedi_get_krange(comedi_t * d, unsigned int subdevice, unsigned int chan,
+	unsigned int range, comedi_krange * krange)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	const comedi_lrange *lr;
+
+	if (s->range_table_list) {
+		lr = s->range_table_list[chan];
+	} else {
+		lr = s->range_table;
+	}
+	if (range >= lr->length) {
+		return -EINVAL;
+	}
+	memcpy(krange, lr->range + range, sizeof(comedi_krange));
+
+	return 0;
+}
+
+/*
+ * ALPHA (may be renamed)
+*/
+unsigned int comedi_get_buf_head_pos(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+
+	async = s->async;
+	if (async == NULL)
+		return 0;
+
+	return async->buf_write_count;
+}
+
+int comedi_get_buffer_contents(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+	unsigned int num_bytes;
+
+	if (subdevice >= dev->n_subdevices)
+		return -1;
+	async = s->async;
+	if (async == NULL)
+		return 0;
+	num_bytes = comedi_buf_read_n_available(s->async);
+	return num_bytes;
+}
+
+/*
+ * ALPHA
+*/
+int comedi_set_user_int_count(comedi_t * d, unsigned int subdevice,
+	unsigned int buf_user_count)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+	int num_bytes;
+
+	async = s->async;
+	if (async == NULL)
+		return -1;
+
+	num_bytes = buf_user_count - async->buf_read_count;
+	if (num_bytes < 0)
+		return -1;
+	comedi_buf_read_alloc(async, num_bytes);
+	comedi_buf_read_free(async, num_bytes);
+
+	return 0;
+}
+
+int comedi_mark_buffer_read(comedi_t * d, unsigned int subdevice,
+	unsigned int num_bytes)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+
+	if (subdevice >= dev->n_subdevices)
+		return -1;
+	async = s->async;
+	if (async == NULL)
+		return -1;
+
+	comedi_buf_read_alloc(async, num_bytes);
+	comedi_buf_read_free(async, num_bytes);
+
+	return 0;
+}
+
+int comedi_mark_buffer_written(comedi_t * d, unsigned int subdevice,
+	unsigned int num_bytes)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+	int bytes_written;
+
+	if (subdevice >= dev->n_subdevices)
+		return -1;
+	async = s->async;
+	if (async == NULL)
+		return -1;
+	bytes_written = comedi_buf_write_alloc(async, num_bytes);
+	comedi_buf_write_free(async, bytes_written);
+	if (bytes_written != num_bytes)
+		return -1;
+	return 0;
+}
+
+int comedi_get_buffer_size(comedi_t * d, unsigned int subdev)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdev;
+	comedi_async *async;
+
+	if (subdev >= dev->n_subdevices)
+		return -1;
+	async = s->async;
+	if (async == NULL)
+		return 0;
+
+	return async->prealloc_bufsz;
+}
+
+int comedi_get_buffer_offset(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices + subdevice;
+	comedi_async *async;
+
+	if (subdevice >= dev->n_subdevices)
+		return -1;
+	async = s->async;
+	if (async == NULL)
+		return 0;
+
+	return async->buf_read_ptr;
+}

drivers/staging/comedi/kcomedilib/kcomedilib_main.c

@@ -0,0 +1,567 @@
+/*
+    kcomedilib/kcomedilib.c
+    a comedlib interface for kernel modules
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 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.
+
+*/
+
+#define __NO_VERSION__
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <asm/io.h>
+
+#include "../comedi.h"
+#include "../comedilib.h"
+#include "../comedidev.h"
+
+MODULE_AUTHOR("David Schleef <ds@schleef.org>");
+MODULE_DESCRIPTION("Comedi kernel library");
+MODULE_LICENSE("GPL");
+
+comedi_t *comedi_open(const char *filename)
+{
+	struct comedi_device_file_info *dev_file_info;
+	comedi_device *dev;
+	unsigned int minor;
+
+	if (strncmp(filename, "/dev/comedi", 11) != 0)
+		return NULL;
+
+	minor = simple_strtoul(filename + 11, NULL, 0);
+
+	if (minor >= COMEDI_NUM_BOARD_MINORS)
+		return NULL;
+
+	dev_file_info = comedi_get_device_file_info(minor);
+	if(dev_file_info == NULL)
+		return NULL;
+	dev = dev_file_info->device;
+
+	if(dev == NULL || !dev->attached)
+		return NULL;
+
+	if (!try_module_get(dev->driver->module))
+		return NULL;
+
+	return (comedi_t *) dev;
+}
+
+comedi_t *comedi_open_old(unsigned int minor)
+{
+	struct comedi_device_file_info *dev_file_info;
+	comedi_device *dev;
+
+	if (minor >= COMEDI_NUM_MINORS)
+		return NULL;
+
+	dev_file_info = comedi_get_device_file_info(minor);
+	if(dev_file_info == NULL)
+		return NULL;
+	dev = dev_file_info->device;
+
+	if(dev == NULL || !dev->attached)
+		return NULL;
+
+	return (comedi_t *) dev;
+}
+
+int comedi_close(comedi_t * d)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	module_put(dev->driver->module);
+
+	return 0;
+}
+
+int comedi_loglevel(int newlevel)
+{
+	return 0;
+}
+
+void comedi_perror(const char *message)
+{
+	rt_printk("%s: unknown error\n", message);
+}
+
+char *comedi_strerror(int err)
+{
+	return "unknown error";
+}
+
+int comedi_fileno(comedi_t * d)
+{
+	comedi_device *dev = (comedi_device *) d;
+
+	/* return something random */
+	return dev->minor;
+}
+
+int comedi_command(comedi_t * d, comedi_cmd * cmd)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	comedi_async *async;
+	unsigned runflags;
+
+	if (cmd->subdev >= dev->n_subdevices)
+		return -ENODEV;
+
+	s = dev->subdevices + cmd->subdev;
+	if (s->type == COMEDI_SUBD_UNUSED)
+		return -EIO;
+
+	async = s->async;
+	if (async == NULL)
+		return -ENODEV;
+
+	if (s->busy)
+		return -EBUSY;
+	s->busy = d;
+
+	if (async->cb_mask & COMEDI_CB_EOS)
+		cmd->flags |= TRIG_WAKE_EOS;
+
+	async->cmd = *cmd;
+
+	runflags = SRF_RUNNING;
+
+#ifdef CONFIG_COMEDI_RT
+	if (comedi_switch_to_rt(dev) == 0)
+		runflags |= SRF_RT;
+#endif
+	comedi_set_subdevice_runflags(s, ~0, runflags);
+
+	comedi_reset_async_buf(async);
+
+	return s->do_cmd(dev, s);
+}
+
+int comedi_command_test(comedi_t * d, comedi_cmd * cmd)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+
+	if (cmd->subdev >= dev->n_subdevices)
+		return -ENODEV;
+
+	s = dev->subdevices + cmd->subdev;
+	if (s->type == COMEDI_SUBD_UNUSED)
+		return -EIO;
+
+	if (s->async == NULL)
+		return -ENODEV;
+
+	return s->do_cmdtest(dev, s, cmd);
+}
+
+/*
+ *	COMEDI_INSN
+ *	perform an instruction
+ */
+int comedi_do_insn(comedi_t * d, comedi_insn * insn)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	int ret = 0;
+
+	if (insn->insn & INSN_MASK_SPECIAL) {
+		switch (insn->insn) {
+		case INSN_GTOD:
+			{
+				struct timeval tv;
+
+				do_gettimeofday(&tv);
+				insn->data[0] = tv.tv_sec;
+				insn->data[1] = tv.tv_usec;
+				ret = 2;
+
+				break;
+			}
+		case INSN_WAIT:
+			/* XXX isn't the value supposed to be nanosecs? */
+			if (insn->n != 1 || insn->data[0] >= 100) {
+				ret = -EINVAL;
+				break;
+			}
+			comedi_udelay(insn->data[0]);
+			ret = 1;
+			break;
+		case INSN_INTTRIG:
+			if (insn->n != 1) {
+				ret = -EINVAL;
+				break;
+			}
+			if (insn->subdev >= dev->n_subdevices) {
+				rt_printk("%d not usable subdevice\n",
+					insn->subdev);
+				ret = -EINVAL;
+				break;
+			}
+			s = dev->subdevices + insn->subdev;
+			if (!s->async) {
+				rt_printk("no async\n");
+				ret = -EINVAL;
+				break;
+			}
+			if (!s->async->inttrig) {
+				rt_printk("no inttrig\n");
+				ret = -EAGAIN;
+				break;
+			}
+			ret = s->async->inttrig(dev, s, insn->data[0]);
+			if (ret >= 0)
+				ret = 1;
+			break;
+		default:
+			ret = -EINVAL;
+		}
+	} else {
+		/* a subdevice instruction */
+		if (insn->subdev >= dev->n_subdevices) {
+			ret = -EINVAL;
+			goto error;
+		}
+		s = dev->subdevices + insn->subdev;
+
+		if (s->type == COMEDI_SUBD_UNUSED) {
+			rt_printk("%d not useable subdevice\n", insn->subdev);
+			ret = -EIO;
+			goto error;
+		}
+
+		/* XXX check lock */
+
+		if ((ret = check_chanlist(s, 1, &insn->chanspec)) < 0) {
+			rt_printk("bad chanspec\n");
+			ret = -EINVAL;
+			goto error;
+		}
+
+		if (s->busy) {
+			ret = -EBUSY;
+			goto error;
+		}
+		s->busy = d;
+
+		switch (insn->insn) {
+		case INSN_READ:
+			ret = s->insn_read(dev, s, insn, insn->data);
+			break;
+		case INSN_WRITE:
+			ret = s->insn_write(dev, s, insn, insn->data);
+			break;
+		case INSN_BITS:
+			ret = s->insn_bits(dev, s, insn, insn->data);
+			break;
+		case INSN_CONFIG:
+			/* XXX should check instruction length */
+			ret = s->insn_config(dev, s, insn, insn->data);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		s->busy = NULL;
+	}
+	if (ret < 0)
+		goto error;
+#if 0
+	/* XXX do we want this? -- abbotti #if'ed it out for now. */
+	if (ret != insn->n) {
+		rt_printk("BUG: result of insn != insn.n\n");
+		ret = -EINVAL;
+		goto error;
+	}
+#endif
+      error:
+
+	return ret;
+}
+
+/*
+	COMEDI_LOCK
+	lock subdevice
+
+	arg:
+		subdevice number
+
+	reads:
+		none
+
+	writes:
+		none
+
+	necessary locking:
+	- ioctl/rt lock  (this type)
+	- lock while subdevice busy
+	- lock while subdevice being programmed
+
+*/
+int comedi_lock(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	unsigned long flags;
+	int ret = 0;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	comedi_spin_lock_irqsave(&s->spin_lock, flags);
+
+	if (s->busy) {
+		ret = -EBUSY;
+	} else {
+		if (s->lock) {
+			ret = -EBUSY;
+		} else {
+			s->lock = d;
+		}
+	}
+
+	comedi_spin_unlock_irqrestore(&s->spin_lock, flags);
+
+	return ret;
+}
+
+/*
+	COMEDI_UNLOCK
+	unlock subdevice
+
+	arg:
+		subdevice number
+
+	reads:
+		none
+
+	writes:
+		none
+
+*/
+int comedi_unlock(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	unsigned long flags;
+	comedi_async *async;
+	int ret;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	async = s->async;
+
+	comedi_spin_lock_irqsave(&s->spin_lock, flags);
+
+	if (s->busy) {
+		ret = -EBUSY;
+	} else if (s->lock && s->lock != (void *)d) {
+		ret = -EACCES;
+	} else {
+		s->lock = NULL;
+
+		if (async) {
+			async->cb_mask = 0;
+			async->cb_func = NULL;
+			async->cb_arg = NULL;
+		}
+
+		ret = 0;
+	}
+
+	comedi_spin_unlock_irqrestore(&s->spin_lock, flags);
+
+	return ret;
+}
+
+/*
+	COMEDI_CANCEL
+	cancel acquisition ioctl
+
+	arg:
+		subdevice number
+
+	reads:
+		nothing
+
+	writes:
+		nothing
+
+*/
+int comedi_cancel(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	int ret = 0;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	if (s->lock && s->lock != d)
+		return -EACCES;
+
+#if 0
+	if (!s->busy)
+		return 0;
+
+	if (s->busy != d)
+		return -EBUSY;
+#endif
+
+	if (!s->cancel || !s->async)
+		return -EINVAL;
+
+	if ((ret = s->cancel(dev, s)))
+		return ret;
+
+#ifdef CONFIG_COMEDI_RT
+	if (comedi_get_subdevice_runflags(s) & SRF_RT) {
+		comedi_switch_to_non_rt(dev);
+	}
+#endif
+	comedi_set_subdevice_runflags(s, SRF_RUNNING | SRF_RT, 0);
+	s->async->inttrig = NULL;
+	s->busy = NULL;
+
+	return 0;
+}
+
+/*
+   registration of callback functions
+ */
+int comedi_register_callback(comedi_t * d, unsigned int subdevice,
+	unsigned int mask, int (*cb) (unsigned int, void *), void *arg)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+	comedi_async *async;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	async = s->async;
+	if (s->type == COMEDI_SUBD_UNUSED || !async)
+		return -EIO;
+
+	/* are we locked? (ioctl lock) */
+	if (s->lock && s->lock != d)
+		return -EACCES;
+
+	/* are we busy? */
+	if (s->busy)
+		return -EBUSY;
+
+	if (!mask) {
+		async->cb_mask = 0;
+		async->cb_func = NULL;
+		async->cb_arg = NULL;
+	} else {
+		async->cb_mask = mask;
+		async->cb_func = cb;
+		async->cb_arg = arg;
+	}
+
+	return 0;
+}
+
+int comedi_poll(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s = dev->subdevices;
+	comedi_async *async;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	async = s->async;
+	if (s->type == COMEDI_SUBD_UNUSED || !async)
+		return -EIO;
+
+	/* are we locked? (ioctl lock) */
+	if (s->lock && s->lock != d)
+		return -EACCES;
+
+	/* are we running? XXX wrong? */
+	if (!s->busy)
+		return -EIO;
+
+	return s->poll(dev, s);
+}
+
+/* WARNING: not portable */
+int comedi_map(comedi_t * d, unsigned int subdevice, void *ptr)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	if (!s->async)
+		return -EINVAL;
+
+	if (ptr) {
+		*((void **)ptr) = s->async->prealloc_buf;
+	}
+
+	/* XXX no reference counting */
+
+	return 0;
+}
+
+/* WARNING: not portable */
+int comedi_unmap(comedi_t * d, unsigned int subdevice)
+{
+	comedi_device *dev = (comedi_device *) d;
+	comedi_subdevice *s;
+
+	if (subdevice >= dev->n_subdevices) {
+		return -EINVAL;
+	}
+	s = dev->subdevices + subdevice;
+
+	if (!s->async)
+		return -EINVAL;
+
+	/* XXX no reference counting */
+
+	return 0;
+}

drivers/staging/comedi/kcomedilib/ksyms.c

@@ -0,0 +1,144 @@
+/*
+    comedi/kcomedilib/ksyms.c
+    a comedlib interface for kernel modules
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2001 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.
+
+*/
+
+#ifndef EXPORT_SYMTAB
+#define EXPORT_SYMTAB
+#endif
+
+#include "../comedi.h"
+#include "../comedilib.h"
+#include "../comedidev.h"
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#if LINUX_VERSION_CODE >= 0x020200
+
+/* functions specific to kcomedilib */
+
+EXPORT_SYMBOL(comedi_register_callback);
+EXPORT_SYMBOL(comedi_get_krange);
+EXPORT_SYMBOL(comedi_get_buf_head_pos);
+EXPORT_SYMBOL(comedi_set_user_int_count);
+EXPORT_SYMBOL(comedi_map);
+EXPORT_SYMBOL(comedi_unmap);
+
+/* This list comes from user-space comedilib, to show which
+ * functions are not ported yet. */
+
+EXPORT_SYMBOL(comedi_open);
+EXPORT_SYMBOL(comedi_close);
+
+/* logging */
+EXPORT_SYMBOL(comedi_loglevel);
+EXPORT_SYMBOL(comedi_perror);
+EXPORT_SYMBOL(comedi_strerror);
+//EXPORT_SYMBOL(comedi_errno);
+EXPORT_SYMBOL(comedi_fileno);
+
+/* device queries */
+EXPORT_SYMBOL(comedi_get_n_subdevices);
+EXPORT_SYMBOL(comedi_get_version_code);
+EXPORT_SYMBOL(comedi_get_driver_name);
+EXPORT_SYMBOL(comedi_get_board_name);
+
+/* subdevice queries */
+EXPORT_SYMBOL(comedi_get_subdevice_type);
+EXPORT_SYMBOL(comedi_find_subdevice_by_type);
+EXPORT_SYMBOL(comedi_get_subdevice_flags);
+EXPORT_SYMBOL(comedi_get_n_channels);
+//EXPORT_SYMBOL(comedi_range_is_chan_specific);
+//EXPORT_SYMBOL(comedi_maxdata_is_chan_specific);
+
+/* channel queries */
+EXPORT_SYMBOL(comedi_get_maxdata);
+#ifdef KCOMEDILIB_DEPRECATED
+EXPORT_SYMBOL(comedi_get_rangetype);
+#endif
+EXPORT_SYMBOL(comedi_get_n_ranges);
+//EXPORT_SYMBOL(comedi_find_range);
+
+/* buffer queries */
+EXPORT_SYMBOL(comedi_get_buffer_size);
+//EXPORT_SYMBOL(comedi_get_max_buffer_size);
+//EXPORT_SYMBOL(comedi_set_buffer_size);
+EXPORT_SYMBOL(comedi_get_buffer_contents);
+EXPORT_SYMBOL(comedi_get_buffer_offset);
+
+/* low-level stuff */
+//EXPORT_SYMBOL(comedi_trigger);
+//EXPORT_SYMBOL(comedi_do_insnlist);
+EXPORT_SYMBOL(comedi_do_insn);
+EXPORT_SYMBOL(comedi_lock);
+EXPORT_SYMBOL(comedi_unlock);
+
+/* physical units */
+//EXPORT_SYMBOL(comedi_to_phys);
+//EXPORT_SYMBOL(comedi_from_phys);
+
+/* synchronous stuff */
+EXPORT_SYMBOL(comedi_data_read);
+EXPORT_SYMBOL(comedi_data_read_hint);
+EXPORT_SYMBOL(comedi_data_read_delayed);
+EXPORT_SYMBOL(comedi_data_write);
+EXPORT_SYMBOL(comedi_dio_config);
+EXPORT_SYMBOL(comedi_dio_read);
+EXPORT_SYMBOL(comedi_dio_write);
+EXPORT_SYMBOL(comedi_dio_bitfield);
+
+/* slowly varying stuff */
+//EXPORT_SYMBOL(comedi_sv_init);
+//EXPORT_SYMBOL(comedi_sv_update);
+//EXPORT_SYMBOL(comedi_sv_measure);
+
+/* commands */
+//EXPORT_SYMBOL(comedi_get_cmd_src_mask);
+//EXPORT_SYMBOL(comedi_get_cmd_generic_timed);
+EXPORT_SYMBOL(comedi_cancel);
+EXPORT_SYMBOL(comedi_command);
+EXPORT_SYMBOL(comedi_command_test);
+EXPORT_SYMBOL(comedi_poll);
+
+/* buffer configuration */
+EXPORT_SYMBOL(comedi_mark_buffer_read);
+EXPORT_SYMBOL(comedi_mark_buffer_written);
+
+//EXPORT_SYMBOL(comedi_get_range);
+EXPORT_SYMBOL(comedi_get_len_chanlist);
+
+/* deprecated */
+//EXPORT_SYMBOL(comedi_get_timer);
+//EXPORT_SYMBOL(comedi_timed_1chan);
+
+/* alpha */
+//EXPORT_SYMBOL(comedi_set_global_oor_behavior);
+
+#endif