Staging: comedi: add comedi_test driver
This adds the comedi_test driver to the kernel tree From: Joachim Wuttke <Joachim.Wuttke@icn.siemens.de> Cc: David Schleef <ds@schleef.org> Cc: Frank Mori Hess <fmhess@users.sourceforge.net> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Joachim Wuttke
Greg Kroah-Hartman
parent
3cf840f65a
commit
498460ebd5
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@ -4,6 +4,7 @@
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# Comedi "helper" modules
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obj-$(CONFIG_COMEDI) += comedi_fc.o
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obj-$(CONFIG_COMEDI) += comedi_bond.o
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obj-$(CONFIG_COMEDI) += comedi_test.o
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# Comedi PCI drivers
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obj-$(CONFIG_COMEDI_PCI_DRIVERS) += mite.o
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@ -0,0 +1,526 @@
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/*
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comedi/drivers/comedi_test.c
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Generates fake waveform signals that can be read through
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the command interface. It does _not_ read from any board;
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it just generates deterministic waveforms.
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Useful for various testing purposes.
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Copyright (C) 2002 Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>
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Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net>
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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************************************************************************/
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/*
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Driver: comedi_test
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Description: generates fake waveforms
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Author: Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>, Frank Mori Hess
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<fmhess@users.sourceforge.net>, ds
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Devices:
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Status: works
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Updated: Sat, 16 Mar 2002 17:34:48 -0800
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This driver is mainly for testing purposes, but can also be used to
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generate sample waveforms on systems that don't have data acquisition
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hardware.
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Configuration options:
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[0] - Amplitude in microvolts for fake waveforms (default 1 volt)
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[1] - Period in microseconds for fake waveforms (default 0.1 sec)
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Generates a sawtooth wave on channel 0, square wave on channel 1, additional
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waveforms could be added to other channels (currently they return flatline
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zero volts).
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*/
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#include "../comedidev.h"
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#include <asm/div64.h>
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#include "comedi_fc.h"
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/* Board descriptions */
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typedef struct waveform_board_struct {
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const char *name;
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int ai_chans;
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int ai_bits;
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int have_dio;
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} waveform_board;
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#define N_CHANS 8
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static const waveform_board waveform_boards[] = {
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{
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name: "comedi_test",
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ai_chans:N_CHANS,
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ai_bits: 16,
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have_dio:0,
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},
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};
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#define thisboard ((const waveform_board *)dev->board_ptr)
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/* Data unique to this driver */
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typedef struct {
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struct timer_list timer;
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struct timeval last; // time at which last timer interrupt occured
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unsigned int uvolt_amplitude; // waveform amplitude in microvolts
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unsigned long usec_period; // waveform period in microseconds
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volatile unsigned long usec_current; // current time (modulo waveform period)
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volatile unsigned long usec_remainder; // usec since last scan;
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volatile unsigned long ai_count; // number of conversions remaining
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unsigned int scan_period; // scan period in usec
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unsigned int convert_period; // conversion period in usec
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volatile unsigned timer_running:1;
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volatile lsampl_t ao_loopbacks[N_CHANS];
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} waveform_private;
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#define devpriv ((waveform_private *)dev->private)
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static int waveform_attach(comedi_device * dev, comedi_devconfig * it);
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static int waveform_detach(comedi_device * dev);
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static comedi_driver driver_waveform = {
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driver_name:"comedi_test",
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module:THIS_MODULE,
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attach:waveform_attach,
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detach:waveform_detach,
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board_name:&waveform_boards[0].name,
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offset:sizeof(waveform_board),
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num_names:sizeof(waveform_boards) / sizeof(waveform_board),
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};
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COMEDI_INITCLEANUP(driver_waveform);
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static int waveform_ai_cmdtest(comedi_device * dev, comedi_subdevice * s,
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comedi_cmd * cmd);
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static int waveform_ai_cmd(comedi_device * dev, comedi_subdevice * s);
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static int waveform_ai_cancel(comedi_device * dev, comedi_subdevice * s);
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static int waveform_ai_insn_read(comedi_device * dev, comedi_subdevice * s,
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comedi_insn * insn, lsampl_t * data);
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static int waveform_ao_insn_write(comedi_device * dev, comedi_subdevice * s,
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comedi_insn * insn, lsampl_t * data);
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static sampl_t fake_sawtooth(comedi_device * dev, unsigned int range,
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unsigned long current_time);
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static sampl_t fake_squarewave(comedi_device * dev, unsigned int range,
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unsigned long current_time);
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static sampl_t fake_flatline(comedi_device * dev, unsigned int range,
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unsigned long current_time);
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static sampl_t fake_waveform(comedi_device * dev, unsigned int channel,
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unsigned int range, unsigned long current_time);
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static const int nano_per_micro = 1000; // 1000 nanosec in a microsec
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// fake analog input ranges
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static const comedi_lrange waveform_ai_ranges = {
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2,
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{
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BIP_RANGE(10),
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BIP_RANGE(5),
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}
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};
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/*
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This is the background routine used to generate arbitrary data.
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It should run in the background; therefore it is scheduled by
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a timer mechanism.
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*/
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static void waveform_ai_interrupt(unsigned long arg)
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{
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comedi_device *dev = (comedi_device *) arg;
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comedi_async *async = dev->read_subdev->async;
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comedi_cmd *cmd = &async->cmd;
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unsigned int i, j;
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// all times in microsec
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unsigned long elapsed_time;
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unsigned int num_scans;
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struct timeval now;
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do_gettimeofday(&now);
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elapsed_time =
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1000000 * (now.tv_sec - devpriv->last.tv_sec) + now.tv_usec -
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devpriv->last.tv_usec;
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devpriv->last = now;
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num_scans =
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(devpriv->usec_remainder + elapsed_time) / devpriv->scan_period;
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devpriv->usec_remainder =
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(devpriv->usec_remainder + elapsed_time) % devpriv->scan_period;
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async->events = 0;
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for (i = 0; i < num_scans; i++) {
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for (j = 0; j < cmd->chanlist_len; j++) {
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cfc_write_to_buffer(dev->read_subdev,
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fake_waveform(dev, CR_CHAN(cmd->chanlist[j]),
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CR_RANGE(cmd->chanlist[j]),
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devpriv->usec_current +
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i * devpriv->scan_period +
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j * devpriv->convert_period));
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}
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devpriv->ai_count++;
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if (cmd->stop_src == TRIG_COUNT
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&& devpriv->ai_count >= cmd->stop_arg) {
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async->events |= COMEDI_CB_EOA;
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break;
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}
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}
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devpriv->usec_current += elapsed_time;
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devpriv->usec_current %= devpriv->usec_period;
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if ((async->events & COMEDI_CB_EOA) == 0 && devpriv->timer_running)
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mod_timer(&devpriv->timer, jiffies + 1);
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else
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del_timer(&devpriv->timer);
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comedi_event(dev, dev->read_subdev);
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}
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static int waveform_attach(comedi_device * dev, comedi_devconfig * it)
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{
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comedi_subdevice *s;
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int amplitude = it->options[0];
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int period = it->options[1];
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printk("comedi%d: comedi_test: ", dev->minor);
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dev->board_name = thisboard->name;
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if (alloc_private(dev, sizeof(waveform_private)) < 0)
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return -ENOMEM;
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// set default amplitude and period
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if (amplitude <= 0)
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amplitude = 1000000; // 1 volt
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if (period <= 0)
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period = 100000; // 0.1 sec
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devpriv->uvolt_amplitude = amplitude;
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devpriv->usec_period = period;
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printk("%i microvolt, %li microsecond waveform ",
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devpriv->uvolt_amplitude, devpriv->usec_period);
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dev->n_subdevices = 2;
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if (alloc_subdevices(dev, dev->n_subdevices) < 0)
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return -ENOMEM;
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s = dev->subdevices + 0;
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dev->read_subdev = s;
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/* analog input subdevice */
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s->type = COMEDI_SUBD_AI;
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s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
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s->n_chan = thisboard->ai_chans;
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s->maxdata = (1 << thisboard->ai_bits) - 1;
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s->range_table = &waveform_ai_ranges;
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s->len_chanlist = s->n_chan * 2;
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s->insn_read = waveform_ai_insn_read;
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s->do_cmd = waveform_ai_cmd;
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s->do_cmdtest = waveform_ai_cmdtest;
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s->cancel = waveform_ai_cancel;
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s = dev->subdevices + 1;
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dev->write_subdev = s;
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/* analog output subdevice (loopback) */
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s->type = COMEDI_SUBD_AO;
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s->subdev_flags = SDF_WRITEABLE | SDF_GROUND;
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s->n_chan = thisboard->ai_chans;
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s->maxdata = (1 << thisboard->ai_bits) - 1;
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s->range_table = &waveform_ai_ranges;
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s->len_chanlist = s->n_chan * 2;
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s->insn_write = waveform_ao_insn_write;
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s->do_cmd = 0;
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s->do_cmdtest = 0;
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s->cancel = 0;
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{
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/* Our default loopback value is just a 0V flatline */
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int i;
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for (i = 0; i < s->n_chan; i++)
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devpriv->ao_loopbacks[i] = s->maxdata / 2;
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}
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init_timer(&(devpriv->timer));
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devpriv->timer.function = waveform_ai_interrupt;
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devpriv->timer.data = (unsigned long)dev;
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printk("attached\n");
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return 1;
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}
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static int waveform_detach(comedi_device * dev)
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{
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printk("comedi%d: comedi_test: remove\n", dev->minor);
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if (dev->private) {
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waveform_ai_cancel(dev, dev->read_subdev);
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}
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return 0;
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}
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static int waveform_ai_cmdtest(comedi_device * dev, comedi_subdevice * s,
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comedi_cmd * cmd)
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{
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int err = 0;
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int tmp;
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/* step 1: make sure trigger sources are trivially valid */
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tmp = cmd->start_src;
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cmd->start_src &= TRIG_NOW;
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if (!cmd->start_src || tmp != cmd->start_src)
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err++;
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tmp = cmd->scan_begin_src;
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cmd->scan_begin_src &= TRIG_TIMER;
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if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
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err++;
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tmp = cmd->convert_src;
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cmd->convert_src &= TRIG_NOW | TRIG_TIMER;
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if (!cmd->convert_src || tmp != cmd->convert_src)
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err++;
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tmp = cmd->scan_end_src;
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cmd->scan_end_src &= TRIG_COUNT;
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if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
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err++;
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tmp = cmd->stop_src;
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cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
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if (!cmd->stop_src || tmp != cmd->stop_src)
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err++;
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if (err)
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return 1;
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/* step 2: make sure trigger sources are unique and mutually compatible */
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if (cmd->convert_src != TRIG_NOW && cmd->convert_src != TRIG_TIMER)
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err++;
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if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
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err++;
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if (err)
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return 2;
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/* step 3: make sure arguments are trivially compatible */
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if (cmd->start_arg != 0) {
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cmd->start_arg = 0;
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err++;
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}
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if (cmd->convert_src == TRIG_NOW) {
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if (cmd->convert_arg != 0) {
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cmd->convert_arg = 0;
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err++;
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}
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}
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if (cmd->scan_begin_src == TRIG_TIMER) {
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if (cmd->scan_begin_arg < nano_per_micro) {
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cmd->scan_begin_arg = nano_per_micro;
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err++;
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}
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if (cmd->convert_src == TRIG_TIMER &&
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cmd->scan_begin_arg <
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cmd->convert_arg * cmd->chanlist_len) {
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cmd->scan_begin_arg =
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cmd->convert_arg * cmd->chanlist_len;
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err++;
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}
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}
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// XXX these checks are generic and should go in core if not there already
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if (!cmd->chanlist_len) {
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cmd->chanlist_len = 1;
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err++;
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}
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if (cmd->scan_end_arg != cmd->chanlist_len) {
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cmd->scan_end_arg = cmd->chanlist_len;
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err++;
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}
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if (cmd->stop_src == TRIG_COUNT) {
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if (!cmd->stop_arg) {
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cmd->stop_arg = 1;
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err++;
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}
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} else { /* TRIG_NONE */
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if (cmd->stop_arg != 0) {
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cmd->stop_arg = 0;
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err++;
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}
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}
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if (err)
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return 3;
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/* step 4: fix up any arguments */
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if (cmd->scan_begin_src == TRIG_TIMER) {
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tmp = cmd->scan_begin_arg;
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// round to nearest microsec
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cmd->scan_begin_arg =
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nano_per_micro * ((tmp +
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(nano_per_micro / 2)) / nano_per_micro);
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if (tmp != cmd->scan_begin_arg)
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err++;
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}
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if (cmd->convert_src == TRIG_TIMER) {
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tmp = cmd->convert_arg;
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// round to nearest microsec
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cmd->convert_arg =
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nano_per_micro * ((tmp +
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(nano_per_micro / 2)) / nano_per_micro);
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if (tmp != cmd->convert_arg)
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err++;
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}
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if (err)
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return 4;
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return 0;
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}
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static int waveform_ai_cmd(comedi_device * dev, comedi_subdevice * s)
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{
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comedi_cmd *cmd = &s->async->cmd;
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if (cmd->flags & TRIG_RT) {
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comedi_error(dev,
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"commands at RT priority not supported in this driver");
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return -1;
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}
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devpriv->timer_running = 1;
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devpriv->ai_count = 0;
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devpriv->scan_period = cmd->scan_begin_arg / nano_per_micro;
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if (cmd->convert_src == TRIG_NOW)
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devpriv->convert_period = 0;
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else if (cmd->convert_src == TRIG_TIMER)
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devpriv->convert_period = cmd->convert_arg / nano_per_micro;
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else {
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comedi_error(dev, "bug setting conversion period");
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return -1;
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}
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do_gettimeofday(&devpriv->last);
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devpriv->usec_current = devpriv->last.tv_usec % devpriv->usec_period;
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devpriv->usec_remainder = 0;
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devpriv->timer.expires = jiffies + 1;
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add_timer(&devpriv->timer);
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return 0;
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}
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static int waveform_ai_cancel(comedi_device * dev, comedi_subdevice * s)
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{
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devpriv->timer_running = 0;
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del_timer(&devpriv->timer);
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return 0;
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}
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static sampl_t fake_sawtooth(comedi_device * dev, unsigned int range_index,
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unsigned long current_time)
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{
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comedi_subdevice *s = dev->read_subdev;
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unsigned int offset = s->maxdata / 2;
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u64 value;
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const comedi_krange *krange = &s->range_table->range[range_index];
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u64 binary_amplitude;
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binary_amplitude = s->maxdata;
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binary_amplitude *= devpriv->uvolt_amplitude;
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do_div(binary_amplitude, krange->max - krange->min);
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current_time %= devpriv->usec_period;
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value = current_time;
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value *= binary_amplitude * 2;
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do_div(value, devpriv->usec_period);
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value -= binary_amplitude; // get rid of sawtooth's dc offset
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return offset + value;
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}
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static sampl_t fake_squarewave(comedi_device * dev, unsigned int range_index,
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unsigned long current_time)
|
||||
{
|
||||
comedi_subdevice *s = dev->read_subdev;
|
||||
unsigned int offset = s->maxdata / 2;
|
||||
u64 value;
|
||||
const comedi_krange *krange = &s->range_table->range[range_index];
|
||||
current_time %= devpriv->usec_period;
|
||||
|
||||
value = s->maxdata;
|
||||
value *= devpriv->uvolt_amplitude;
|
||||
do_div(value, krange->max - krange->min);
|
||||
|
||||
if (current_time < devpriv->usec_period / 2)
|
||||
value *= -1;
|
||||
|
||||
return offset + value;
|
||||
}
|
||||
|
||||
static sampl_t fake_flatline(comedi_device * dev, unsigned int range_index,
|
||||
unsigned long current_time)
|
||||
{
|
||||
return dev->read_subdev->maxdata / 2;
|
||||
}
|
||||
|
||||
// generates a different waveform depending on what channel is read
|
||||
static sampl_t fake_waveform(comedi_device * dev, unsigned int channel,
|
||||
unsigned int range, unsigned long current_time)
|
||||
{
|
||||
enum {
|
||||
SAWTOOTH_CHAN,
|
||||
SQUARE_CHAN,
|
||||
};
|
||||
switch (channel) {
|
||||
case SAWTOOTH_CHAN:
|
||||
return fake_sawtooth(dev, range, current_time);
|
||||
break;
|
||||
case SQUARE_CHAN:
|
||||
return fake_squarewave(dev, range, current_time);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return fake_flatline(dev, range, current_time);
|
||||
}
|
||||
|
||||
static int waveform_ai_insn_read(comedi_device * dev, comedi_subdevice * s,
|
||||
comedi_insn * insn, lsampl_t * data)
|
||||
{
|
||||
int i, chan = CR_CHAN(insn->chanspec);
|
||||
|
||||
for (i = 0; i < insn->n; i++)
|
||||
data[i] = devpriv->ao_loopbacks[chan];
|
||||
|
||||
return insn->n;
|
||||
}
|
||||
|
||||
static int waveform_ao_insn_write(comedi_device * dev, comedi_subdevice * s,
|
||||
comedi_insn * insn, lsampl_t * data)
|
||||
{
|
||||
int i, chan = CR_CHAN(insn->chanspec);
|
||||
|
||||
for (i = 0; i < insn->n; i++)
|
||||
devpriv->ao_loopbacks[chan] = data[i];
|
||||
|
||||
return insn->n;
|
||||
}
|
||||
Loading…
Reference in New Issue