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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132// SPDX-License-Identifier: GPL-2.0+/* * comedi/range.c * comedi routines for voltage ranges * * COMEDI - Linux Control and Measurement Device Interface * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org> */
#include <linux/uaccess.h>#include <linux/comedi/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 ioctl * range information * * arg: * pointer to comedi_rangeinfo structure * * reads: * comedi_rangeinfo structure * * writes: * array of comedi_krange structures to rangeinfo->range_ptr pointer */int do_rangeinfo_ioctl(struct comedi_device *dev, struct comedi_rangeinfo *it){ int subd, chan; const struct comedi_lrange *lr; struct comedi_subdevice *s;
subd = (it->range_type >> 24) & 0xff; 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) { dev_dbg(dev->class_dev, "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;}
/** * 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 * * Each element consists of a channel number, a range index, an analog * reference type and some flags, all packed into an unsigned int. * * This checks that the channel number and range index are supported by * the comedi subdevice. It does not check whether the analog reference * type and the flags are supported. Drivers that care should check those * themselves. * * Return: %0 if all @chanlist elements are valid (success), * %-EINVAL if one or more elements are invalid. */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;
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) { dev_warn(dev->class_dev, "bad chanlist[%d]=0x%08x chan=%d range length=%d\n", i, chanspec, chan, range_len); return -EINVAL; } } return 0;}EXPORT_SYMBOL_GPL(comedi_check_chanlist);