132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi/range.c
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* comedi routines for voltage ranges
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
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*/
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#include <linux/uaccess.h>
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#include "comedidev.h"
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#include "comedi_internal.h"
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const struct comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
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EXPORT_SYMBOL_GPL(range_bipolar10);
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const struct comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
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EXPORT_SYMBOL_GPL(range_bipolar5);
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const struct comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
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EXPORT_SYMBOL_GPL(range_bipolar2_5);
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const struct comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
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EXPORT_SYMBOL_GPL(range_unipolar10);
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const struct comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
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EXPORT_SYMBOL_GPL(range_unipolar5);
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const struct comedi_lrange range_unipolar2_5 = { 1, {UNI_RANGE(2.5)} };
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EXPORT_SYMBOL_GPL(range_unipolar2_5);
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const struct comedi_lrange range_0_20mA = { 1, {RANGE_mA(0, 20)} };
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EXPORT_SYMBOL_GPL(range_0_20mA);
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const struct comedi_lrange range_4_20mA = { 1, {RANGE_mA(4, 20)} };
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EXPORT_SYMBOL_GPL(range_4_20mA);
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const struct comedi_lrange range_0_32mA = { 1, {RANGE_mA(0, 32)} };
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EXPORT_SYMBOL_GPL(range_0_32mA);
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const struct comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none} } };
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EXPORT_SYMBOL_GPL(range_unknown);
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/*
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* COMEDI_RANGEINFO ioctl
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* range information
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*
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* arg:
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* pointer to comedi_rangeinfo structure
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*
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* reads:
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* comedi_rangeinfo structure
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*
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* writes:
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* array of comedi_krange structures to rangeinfo->range_ptr pointer
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*/
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int do_rangeinfo_ioctl(struct comedi_device *dev,
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struct comedi_rangeinfo *it)
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{
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int subd, chan;
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const struct comedi_lrange *lr;
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struct comedi_subdevice *s;
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subd = (it->range_type >> 24) & 0xf;
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chan = (it->range_type >> 16) & 0xff;
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if (!dev->attached)
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return -EINVAL;
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if (subd >= dev->n_subdevices)
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return -EINVAL;
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s = &dev->subdevices[subd];
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if (s->range_table) {
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lr = s->range_table;
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} else if (s->range_table_list) {
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if (chan >= s->n_chan)
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return -EINVAL;
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lr = s->range_table_list[chan];
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} else {
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return -EINVAL;
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}
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if (RANGE_LENGTH(it->range_type) != lr->length) {
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dev_dbg(dev->class_dev,
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"wrong length %d should be %d (0x%08x)\n",
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RANGE_LENGTH(it->range_type),
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lr->length, it->range_type);
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return -EINVAL;
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}
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if (copy_to_user(it->range_ptr, lr->range,
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sizeof(struct comedi_krange) * lr->length))
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return -EFAULT;
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return 0;
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}
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/**
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* comedi_check_chanlist() - Validate each element in a chanlist.
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* @s: comedi_subdevice struct
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* @n: number of elements in the chanlist
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* @chanlist: the chanlist to validate
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*
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* Each element consists of a channel number, a range index, an analog
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* reference type and some flags, all packed into an unsigned int.
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*
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* This checks that the channel number and range index are supported by
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* the comedi subdevice. It does not check whether the analog reference
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* type and the flags are supported. Drivers that care should check those
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* themselves.
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*
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* Return: %0 if all @chanlist elements are valid (success),
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* %-EINVAL if one or more elements are invalid.
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*/
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int comedi_check_chanlist(struct comedi_subdevice *s, int n,
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unsigned int *chanlist)
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{
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struct comedi_device *dev = s->device;
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unsigned int chanspec;
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int chan, range_len, i;
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for (i = 0; i < n; i++) {
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chanspec = chanlist[i];
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chan = CR_CHAN(chanspec);
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if (s->range_table)
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range_len = s->range_table->length;
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else if (s->range_table_list && chan < s->n_chan)
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range_len = s->range_table_list[chan]->length;
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else
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range_len = 0;
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if (chan >= s->n_chan ||
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CR_RANGE(chanspec) >= range_len) {
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dev_warn(dev->class_dev,
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"bad chanlist[%d]=0x%08x chan=%d range length=%d\n",
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i, chanspec, chan, range_len);
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return -EINVAL;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_check_chanlist);
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