// SPDX-License-Identifier: GPL-2.0+ /* * comedi/drivers/comedi_test.c * * Generates fake waveform signals that can be read through * the command interface. It does _not_ read from any board; * it just generates deterministic waveforms. * Useful for various testing purposes. * * Copyright (C) 2002 Joachim Wuttke <[email protected]> * Copyright (C) 2002 Frank Mori Hess <[email protected]> * * COMEDI - Linux Control and Measurement Device Interface * Copyright (C) 2000 David A. Schleef <[email protected]> */ /* * Driver: comedi_test * Description: generates fake waveforms * Author: Joachim Wuttke <[email protected]>, Frank Mori Hess * <[email protected]>, ds * Devices: * Status: works * Updated: Sat, 16 Mar 2002 17:34:48 -0800 * * This driver is mainly for testing purposes, but can also be used to * generate sample waveforms on systems that don't have data acquisition * hardware. * * Auto-configuration is the default mode if no parameter is supplied during * module loading. Manual configuration requires COMEDI userspace tool. * To disable auto-configuration mode, pass "noauto=1" parameter for module * loading. Refer modinfo or MODULE_PARM_DESC description below for details. * * Auto-configuration options: * Refer modinfo or MODULE_PARM_DESC description below for details. * * Manual configuration options: * [0] - Amplitude in microvolts for fake waveforms (default 1 volt) * [1] - Period in microseconds for fake waveforms (default 0.1 sec) * * Generates a sawtooth wave on channel 0, square wave on channel 1, additional * waveforms could be added to other channels (currently they return flatline * zero volts). */ #include <linux/module.h> #include <linux/comedi/comedidev.h> #include <asm/div64.h> #include <linux/timer.h> #include <linux/ktime.h> #include <linux/jiffies.h> #include <linux/device.h> #include <linux/kdev_t.h> #define N_CHANS … #define DEV_NAME … #define CLASS_NAME … static bool config_mode; static unsigned int set_amplitude; static unsigned int set_period; static const struct class ctcls = …; static struct device *ctdev; module_param_named(noauto, config_mode, bool, 0444); MODULE_PARM_DESC(…) …; module_param_named(amplitude, set_amplitude, uint, 0444); MODULE_PARM_DESC(…) …; module_param_named(period, set_period, uint, 0444); MODULE_PARM_DESC(…) …; /* Data unique to this driver */ struct waveform_private { … }; /* fake analog input ranges */ static const struct comedi_lrange waveform_ai_ranges = …; static unsigned short fake_sawtooth(struct comedi_device *dev, unsigned int range_index, unsigned int current_time) { … } static unsigned short fake_squarewave(struct comedi_device *dev, unsigned int range_index, unsigned int current_time) { … } static unsigned short fake_flatline(struct comedi_device *dev, unsigned int range_index, unsigned int current_time) { … } /* generates a different waveform depending on what channel is read */ static unsigned short fake_waveform(struct comedi_device *dev, unsigned int channel, unsigned int range, unsigned int current_time) { … } /* * This is the background routine used to generate arbitrary data. * It should run in the background; therefore it is scheduled by * a timer mechanism. */ static void waveform_ai_timer(struct timer_list *t) { … } static int waveform_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { … } static int waveform_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) { … } static int waveform_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s) { … } static int waveform_ai_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } /* * This is the background routine to handle AO commands, scheduled by * a timer mechanism. */ static void waveform_ao_timer(struct timer_list *t) { … } static int waveform_ao_inttrig_start(struct comedi_device *dev, struct comedi_subdevice *s, unsigned int trig_num) { … } static int waveform_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { … } static int waveform_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s) { … } static int waveform_ao_cancel(struct comedi_device *dev, struct comedi_subdevice *s) { … } static int waveform_ao_insn_write(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static int waveform_ai_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static int waveform_ao_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { … } static int waveform_common_attach(struct comedi_device *dev, int amplitude, int period) { … } static int waveform_attach(struct comedi_device *dev, struct comedi_devconfig *it) { … } static int waveform_auto_attach(struct comedi_device *dev, unsigned long context_unused) { … } static void waveform_detach(struct comedi_device *dev) { … } static struct comedi_driver waveform_driver = …; /* * For auto-configuration, a device is created to stand in for a * real hardware device. */ static int __init comedi_test_init(void) { … } module_init(…) …; static void __exit comedi_test_exit(void) { … } module_exit(comedi_test_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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