f814e74c9b
Now that the SPDX tag is in all comedi files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Ian Abbott <abbotti@mev.co.uk> Cc: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
135 lines
3.9 KiB
C
135 lines
3.9 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 __user *arg)
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{
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struct comedi_rangeinfo it;
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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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if (copy_from_user(&it, arg, sizeof(struct comedi_rangeinfo)))
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return -EFAULT;
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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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