/*    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.*/ #include <linux/uaccess.h>#include "comedidev.h"#include "comedi_internal.h" const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };EXPORT_SYMBOL_GPL(range_bipolar10);const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };EXPORT_SYMBOL_GPL(range_bipolar5);const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };EXPORT_SYMBOL_GPL(range_bipolar2_5);const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };EXPORT_SYMBOL_GPL(range_unipolar10);const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };EXPORT_SYMBOL_GPL(range_unipolar5);const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };EXPORT_SYMBOL_GPL(range_unipolar2_5);const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };EXPORT_SYMBOL_GPL(range_0_20mA);const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };EXPORT_SYMBOL_GPL(range_4_20mA);const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };EXPORT_SYMBOL_GPL(range_0_32mA);const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };EXPORT_SYMBOL_GPL(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;} /** * comedi_check_chanlist() - Validate each element in a chanlist. * @s: comedi_subdevice struct * @n: number of elements in the chanlist * @chanlist: the chanlist to validate*/int comedi_check_chanlist(struct comedi_subdevice *s, int n,			  unsigned int *chanlist){	struct comedi_device *dev = s->device;	unsigned int chanspec;	int chan, range_len, i; 	if (s->range_table || s->range_table_list) {		for (i = 0; i < n; i++) {			chanspec = chanlist[i];			chan = CR_CHAN(chanspec);			if (s->range_table)				range_len = s->range_table->length;			else if (s->range_table_list && chan < s->n_chan)				range_len = s->range_table_list[chan]->length;			else				range_len = 0;			if (chan >= s->n_chan ||			    CR_RANGE(chanspec) >= range_len ||			    aref_invalid(s, chanspec)) {				dev_warn(dev->class_dev,					 "bad chanlist[%d]=0x%08x chan=%d range length=%d\n",					 i, chanspec, chan, range_len);				return -EINVAL;			}		}	} else {		dev_err(dev->class_dev, "(bug) no range type list!\n");		return -EINVAL;	}	return 0;}EXPORT_SYMBOL_GPL(comedi_check_chanlist);