/*    module/range.c    comedi routines for voltage ranges     COMEDI - Linux Control and Measurement Device Interface    Copyright (C) 1997-8 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 <linux/uaccess.h>#include "comedidev.h"#include "internal.h" const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };EXPORT_SYMBOL(range_bipolar10);const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };EXPORT_SYMBOL(range_bipolar5);const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };EXPORT_SYMBOL(range_bipolar2_5);const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };EXPORT_SYMBOL(range_unipolar10);const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };EXPORT_SYMBOL(range_unipolar5);const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };EXPORT_SYMBOL(range_unknown); /*	COMEDI_RANGEINFO	range information ioctl 	arg:		pointer to rangeinfo structure 	reads:		range info structure 	writes:		n struct comedi_krange structures to rangeinfo->range_ptr*/int do_rangeinfo_ioctl(struct comedi_device *dev,		       struct comedi_rangeinfo __user *arg){	struct comedi_rangeinfo it;	int subd, chan;	const struct comedi_lrange *lr;	struct comedi_subdevice *s; 	if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))		return -EFAULT;	subd = (it.range_type >> 24) & 0xf;	chan = (it.range_type >> 16) & 0xff; 	if (!dev->attached)		return -EINVAL;	if (subd >= dev->n_subdevices)		return -EINVAL;	s = dev->subdevices + subd;	if (s->range_table) {		lr = s->range_table;	} else if (s->range_table_list) {		if (chan >= s->n_chan)			return -EINVAL;		lr = s->range_table_list[chan];	} else {		return -EINVAL;	} 	if (RANGE_LENGTH(it.range_type) != lr->length) {		DPRINTK("wrong length %d should be %d (0x%08x)\n",			RANGE_LENGTH(it.range_type), lr->length, it.range_type);		return -EINVAL;	} 	if (copy_to_user(it.range_ptr, lr->range,			 sizeof(struct comedi_krange) * lr->length))		return -EFAULT; 	return 0;} static int aref_invalid(struct comedi_subdevice *s, unsigned int chanspec){	unsigned int aref; 	/*  disable reporting invalid arefs... maybe someday */	return 0; 	aref = CR_AREF(chanspec);	switch (aref) {	case AREF_DIFF:		if (s->subdev_flags & SDF_DIFF)			return 0;		break;	case AREF_COMMON:		if (s->subdev_flags & SDF_COMMON)			return 0;		break;	case AREF_GROUND:		if (s->subdev_flags & SDF_GROUND)			return 0;		break;	case AREF_OTHER:		if (s->subdev_flags & SDF_OTHER)			return 0;		break;	default:		break;	}	DPRINTK("subdevice does not support aref %i", aref);	return 1;} /*   This function checks each element in a channel/gain list to make   make sure it is valid.*/int comedi_check_chanlist(struct comedi_subdevice *s, int n,			  unsigned int *chanlist){	int i;	int chan; 	if (s->range_table) {		for (i = 0; i < n; i++)			if (CR_CHAN(chanlist[i]) >= s->n_chan ||			    CR_RANGE(chanlist[i]) >= s->range_table->length			    || aref_invalid(s, chanlist[i])) {				printk(KERN_ERR "bad chanlist[%d]=0x%08x "				       "in_chan=%d range length=%d\n", i,				       chanlist[i], s->n_chan,				       s->range_table->length);				return -EINVAL;			}	} else if (s->range_table_list) {		for (i = 0; i < n; i++) {			chan = CR_CHAN(chanlist[i]);			if (chan >= s->n_chan ||			    CR_RANGE(chanlist[i]) >=			    s->range_table_list[chan]->length			    || aref_invalid(s, chanlist[i])) {				printk(KERN_ERR "bad chanlist[%d]=0x%08x\n",				       i, chanlist[i]);				return -EINVAL;			}		}	} else {		printk(KERN_ERR "comedi: (bug) no range type list!\n");		return -EINVAL;	}	return 0;}EXPORT_SYMBOL(comedi_check_chanlist);