diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/comedi_test.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/comedi_test.c | 849 |
1 files changed, 0 insertions, 849 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c deleted file mode 100644 index cbc225eb1991..000000000000 --- a/drivers/staging/comedi/drivers/comedi_test.c +++ /dev/null @@ -1,849 +0,0 @@ -// 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 <Joachim.Wuttke@icn.siemens.de> - * Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net> - * - * COMEDI - Linux Control and Measurement Device Interface - * Copyright (C) 2000 David A. Schleef <ds@schleef.org> - */ - -/* - * Driver: comedi_test - * Description: generates fake waveforms - * Author: Joachim Wuttke <Joachim.Wuttke@icn.siemens.de>, Frank Mori Hess - * <fmhess@users.sourceforge.net>, 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 "../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 8 -#define DEV_NAME "comedi_testd" -#define CLASS_NAME "comedi_test" - -static bool config_mode; -static unsigned int set_amplitude; -static unsigned int set_period; -static struct class *ctcls; -static struct device *ctdev; - -module_param_named(noauto, config_mode, bool, 0444); -MODULE_PARM_DESC(noauto, "Disable auto-configuration: (1=disable [defaults to enable])"); - -module_param_named(amplitude, set_amplitude, uint, 0444); -MODULE_PARM_DESC(amplitude, "Set auto mode wave amplitude in microvolts: (defaults to 1 volt)"); - -module_param_named(period, set_period, uint, 0444); -MODULE_PARM_DESC(period, "Set auto mode wave period in microseconds: (defaults to 0.1 sec)"); - -/* Data unique to this driver */ -struct waveform_private { - struct timer_list ai_timer; /* timer for AI commands */ - u64 ai_convert_time; /* time of next AI conversion in usec */ - unsigned int wf_amplitude; /* waveform amplitude in microvolts */ - unsigned int wf_period; /* waveform period in microseconds */ - unsigned int wf_current; /* current time in waveform period */ - unsigned int ai_scan_period; /* AI scan period in usec */ - unsigned int ai_convert_period; /* AI conversion period in usec */ - struct timer_list ao_timer; /* timer for AO commands */ - struct comedi_device *dev; /* parent comedi device */ - u64 ao_last_scan_time; /* time of previous AO scan in usec */ - unsigned int ao_scan_period; /* AO scan period in usec */ - unsigned short ao_loopbacks[N_CHANS]; -}; - -/* fake analog input ranges */ -static const struct comedi_lrange waveform_ai_ranges = { - 2, { - BIP_RANGE(10), - BIP_RANGE(5) - } -}; - -static unsigned short fake_sawtooth(struct comedi_device *dev, - unsigned int range_index, - unsigned int current_time) -{ - struct waveform_private *devpriv = dev->private; - struct comedi_subdevice *s = dev->read_subdev; - unsigned int offset = s->maxdata / 2; - u64 value; - const struct comedi_krange *krange = - &s->range_table->range[range_index]; - u64 binary_amplitude; - - binary_amplitude = s->maxdata; - binary_amplitude *= devpriv->wf_amplitude; - do_div(binary_amplitude, krange->max - krange->min); - - value = current_time; - value *= binary_amplitude * 2; - do_div(value, devpriv->wf_period); - value += offset; - /* get rid of sawtooth's dc offset and clamp value */ - if (value < binary_amplitude) { - value = 0; /* negative saturation */ - } else { - value -= binary_amplitude; - if (value > s->maxdata) - value = s->maxdata; /* positive saturation */ - } - - return value; -} - -static unsigned short fake_squarewave(struct comedi_device *dev, - unsigned int range_index, - unsigned int current_time) -{ - struct waveform_private *devpriv = dev->private; - struct comedi_subdevice *s = dev->read_subdev; - unsigned int offset = s->maxdata / 2; - u64 value; - const struct comedi_krange *krange = - &s->range_table->range[range_index]; - - value = s->maxdata; - value *= devpriv->wf_amplitude; - do_div(value, krange->max - krange->min); - - /* get one of two values for square-wave and clamp */ - if (current_time < devpriv->wf_period / 2) { - if (offset < value) - value = 0; /* negative saturation */ - else - value = offset - value; - } else { - value += offset; - if (value > s->maxdata) - value = s->maxdata; /* positive saturation */ - } - - return value; -} - -static unsigned short fake_flatline(struct comedi_device *dev, - unsigned int range_index, - unsigned int current_time) -{ - return dev->read_subdev->maxdata / 2; -} - -/* 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) -{ - enum { - SAWTOOTH_CHAN, - SQUARE_CHAN, - }; - switch (channel) { - case SAWTOOTH_CHAN: - return fake_sawtooth(dev, range, current_time); - case SQUARE_CHAN: - return fake_squarewave(dev, range, current_time); - default: - break; - } - - return fake_flatline(dev, range, 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) -{ - struct waveform_private *devpriv = from_timer(devpriv, t, ai_timer); - struct comedi_device *dev = devpriv->dev; - struct comedi_subdevice *s = dev->read_subdev; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - u64 now; - unsigned int nsamples; - unsigned int time_increment; - - now = ktime_to_us(ktime_get()); - nsamples = comedi_nsamples_left(s, UINT_MAX); - - while (nsamples && devpriv->ai_convert_time < now) { - unsigned int chanspec = cmd->chanlist[async->cur_chan]; - unsigned short sample; - - sample = fake_waveform(dev, CR_CHAN(chanspec), - CR_RANGE(chanspec), devpriv->wf_current); - if (comedi_buf_write_samples(s, &sample, 1) == 0) - goto overrun; - time_increment = devpriv->ai_convert_period; - if (async->scan_progress == 0) { - /* done last conversion in scan, so add dead time */ - time_increment += devpriv->ai_scan_period - - devpriv->ai_convert_period * - cmd->scan_end_arg; - } - devpriv->wf_current += time_increment; - if (devpriv->wf_current >= devpriv->wf_period) - devpriv->wf_current %= devpriv->wf_period; - devpriv->ai_convert_time += time_increment; - nsamples--; - } - - if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) { - async->events |= COMEDI_CB_EOA; - } else { - if (devpriv->ai_convert_time > now) - time_increment = devpriv->ai_convert_time - now; - else - time_increment = 1; - mod_timer(&devpriv->ai_timer, - jiffies + usecs_to_jiffies(time_increment)); - } - -overrun: - comedi_handle_events(dev, s); -} - -static int waveform_ai_cmdtest(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_cmd *cmd) -{ - int err = 0; - unsigned int arg, limit; - - /* Step 1 : check if triggers are trivially valid */ - - err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW); - err |= comedi_check_trigger_src(&cmd->scan_begin_src, - TRIG_FOLLOW | TRIG_TIMER); - err |= comedi_check_trigger_src(&cmd->convert_src, - TRIG_NOW | TRIG_TIMER); - err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); - err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); - - if (err) - return 1; - - /* Step 2a : make sure trigger sources are unique */ - - err |= comedi_check_trigger_is_unique(cmd->convert_src); - err |= comedi_check_trigger_is_unique(cmd->stop_src); - - /* Step 2b : and mutually compatible */ - - if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW) - err |= -EINVAL; /* scan period would be 0 */ - - if (err) - return 2; - - /* Step 3: check if arguments are trivially valid */ - - err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); - - if (cmd->convert_src == TRIG_NOW) { - err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); - } else { /* cmd->convert_src == TRIG_TIMER */ - if (cmd->scan_begin_src == TRIG_FOLLOW) { - err |= comedi_check_trigger_arg_min(&cmd->convert_arg, - NSEC_PER_USEC); - } - } - - if (cmd->scan_begin_src == TRIG_FOLLOW) { - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); - } else { /* cmd->scan_begin_src == TRIG_TIMER */ - err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, - NSEC_PER_USEC); - } - - err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1); - err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, - cmd->chanlist_len); - - if (cmd->stop_src == TRIG_COUNT) - err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); - else /* cmd->stop_src == TRIG_NONE */ - err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); - - if (err) - return 3; - - /* step 4: fix up any arguments */ - - if (cmd->convert_src == TRIG_TIMER) { - /* round convert_arg to nearest microsecond */ - arg = cmd->convert_arg; - arg = min(arg, - rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); - arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); - if (cmd->scan_begin_arg == TRIG_TIMER) { - /* limit convert_arg to keep scan_begin_arg in range */ - limit = UINT_MAX / cmd->scan_end_arg; - limit = rounddown(limit, (unsigned int)NSEC_PER_SEC); - arg = min(arg, limit); - } - err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); - } - - if (cmd->scan_begin_src == TRIG_TIMER) { - /* round scan_begin_arg to nearest microsecond */ - arg = cmd->scan_begin_arg; - arg = min(arg, - rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); - arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); - if (cmd->convert_src == TRIG_TIMER) { - /* but ensure scan_begin_arg is large enough */ - arg = max(arg, cmd->convert_arg * cmd->scan_end_arg); - } - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); - } - - if (err) - return 4; - - return 0; -} - -static int waveform_ai_cmd(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct waveform_private *devpriv = dev->private; - struct comedi_cmd *cmd = &s->async->cmd; - unsigned int first_convert_time; - u64 wf_current; - - if (cmd->flags & CMDF_PRIORITY) { - dev_err(dev->class_dev, - "commands at RT priority not supported in this driver\n"); - return -1; - } - - if (cmd->convert_src == TRIG_NOW) - devpriv->ai_convert_period = 0; - else /* cmd->convert_src == TRIG_TIMER */ - devpriv->ai_convert_period = cmd->convert_arg / NSEC_PER_USEC; - - if (cmd->scan_begin_src == TRIG_FOLLOW) { - devpriv->ai_scan_period = devpriv->ai_convert_period * - cmd->scan_end_arg; - } else { /* cmd->scan_begin_src == TRIG_TIMER */ - devpriv->ai_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC; - } - - /* - * Simulate first conversion to occur at convert period after - * conversion timer starts. If scan_begin_src is TRIG_FOLLOW, assume - * the conversion timer starts immediately. If scan_begin_src is - * TRIG_TIMER, assume the conversion timer starts after the scan - * period. - */ - first_convert_time = devpriv->ai_convert_period; - if (cmd->scan_begin_src == TRIG_TIMER) - first_convert_time += devpriv->ai_scan_period; - devpriv->ai_convert_time = ktime_to_us(ktime_get()) + - first_convert_time; - - /* Determine time within waveform period at time of conversion. */ - wf_current = devpriv->ai_convert_time; - devpriv->wf_current = do_div(wf_current, devpriv->wf_period); - - /* - * Schedule timer to expire just after first conversion time. - * Seem to need an extra jiffy here, otherwise timer expires slightly - * early! - */ - devpriv->ai_timer.expires = - jiffies + usecs_to_jiffies(devpriv->ai_convert_period) + 1; - add_timer(&devpriv->ai_timer); - return 0; -} - -static int waveform_ai_cancel(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct waveform_private *devpriv = dev->private; - - if (in_softirq()) { - /* Assume we were called from the timer routine itself. */ - del_timer(&devpriv->ai_timer); - } else { - del_timer_sync(&devpriv->ai_timer); - } - return 0; -} - -static int waveform_ai_insn_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - struct waveform_private *devpriv = dev->private; - int i, chan = CR_CHAN(insn->chanspec); - - for (i = 0; i < insn->n; i++) - data[i] = devpriv->ao_loopbacks[chan]; - - return insn->n; -} - -/* - * This is the background routine to handle AO commands, scheduled by - * a timer mechanism. - */ -static void waveform_ao_timer(struct timer_list *t) -{ - struct waveform_private *devpriv = from_timer(devpriv, t, ao_timer); - struct comedi_device *dev = devpriv->dev; - struct comedi_subdevice *s = dev->write_subdev; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - u64 now; - u64 scans_since; - unsigned int scans_avail = 0; - - /* determine number of scan periods since last time */ - now = ktime_to_us(ktime_get()); - scans_since = now - devpriv->ao_last_scan_time; - do_div(scans_since, devpriv->ao_scan_period); - if (scans_since) { - unsigned int i; - - /* determine scans in buffer, limit to scans to do this time */ - scans_avail = comedi_nscans_left(s, 0); - if (scans_avail > scans_since) - scans_avail = scans_since; - if (scans_avail) { - /* skip all but the last scan to save processing time */ - if (scans_avail > 1) { - unsigned int skip_bytes, nbytes; - - skip_bytes = - comedi_samples_to_bytes(s, cmd->scan_end_arg * - (scans_avail - 1)); - nbytes = comedi_buf_read_alloc(s, skip_bytes); - comedi_buf_read_free(s, nbytes); - comedi_inc_scan_progress(s, nbytes); - if (nbytes < skip_bytes) { - /* unexpected underrun! (cancelled?) */ - async->events |= COMEDI_CB_OVERFLOW; - goto underrun; - } - } - /* output the last scan */ - for (i = 0; i < cmd->scan_end_arg; i++) { - unsigned int chan = CR_CHAN(cmd->chanlist[i]); - unsigned short *pd; - - pd = &devpriv->ao_loopbacks[chan]; - - if (!comedi_buf_read_samples(s, pd, 1)) { - /* unexpected underrun! (cancelled?) */ - async->events |= COMEDI_CB_OVERFLOW; - goto underrun; - } - } - /* advance time of last scan */ - devpriv->ao_last_scan_time += - (u64)scans_avail * devpriv->ao_scan_period; - } - } - if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) { - async->events |= COMEDI_CB_EOA; - } else if (scans_avail < scans_since) { - async->events |= COMEDI_CB_OVERFLOW; - } else { - unsigned int time_inc = devpriv->ao_last_scan_time + - devpriv->ao_scan_period - now; - - mod_timer(&devpriv->ao_timer, - jiffies + usecs_to_jiffies(time_inc)); - } - -underrun: - comedi_handle_events(dev, s); -} - -static int waveform_ao_inttrig_start(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int trig_num) -{ - struct waveform_private *devpriv = dev->private; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - - if (trig_num != cmd->start_arg) - return -EINVAL; - - async->inttrig = NULL; - - devpriv->ao_last_scan_time = ktime_to_us(ktime_get()); - devpriv->ao_timer.expires = - jiffies + usecs_to_jiffies(devpriv->ao_scan_period); - add_timer(&devpriv->ao_timer); - - return 1; -} - -static int waveform_ao_cmdtest(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_cmd *cmd) -{ - int err = 0; - unsigned int arg; - - /* Step 1 : check if triggers are trivially valid */ - - err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT); - err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER); - err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW); - err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); - err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); - - if (err) - return 1; - - /* Step 2a : make sure trigger sources are unique */ - - err |= comedi_check_trigger_is_unique(cmd->stop_src); - - /* Step 2b : and mutually compatible */ - - if (err) - return 2; - - /* Step 3: check if arguments are trivially valid */ - - err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, - NSEC_PER_USEC); - err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); - err |= comedi_check_trigger_arg_min(&cmd->chanlist_len, 1); - err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, - cmd->chanlist_len); - if (cmd->stop_src == TRIG_COUNT) - err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); - else /* cmd->stop_src == TRIG_NONE */ - err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); - - if (err) - return 3; - - /* step 4: fix up any arguments */ - - /* round scan_begin_arg to nearest microsecond */ - arg = cmd->scan_begin_arg; - arg = min(arg, rounddown(UINT_MAX, (unsigned int)NSEC_PER_USEC)); - arg = NSEC_PER_USEC * DIV_ROUND_CLOSEST(arg, NSEC_PER_USEC); - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); - - if (err) - return 4; - - return 0; -} - -static int waveform_ao_cmd(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct waveform_private *devpriv = dev->private; - struct comedi_cmd *cmd = &s->async->cmd; - - if (cmd->flags & CMDF_PRIORITY) { - dev_err(dev->class_dev, - "commands at RT priority not supported in this driver\n"); - return -1; - } - - devpriv->ao_scan_period = cmd->scan_begin_arg / NSEC_PER_USEC; - s->async->inttrig = waveform_ao_inttrig_start; - return 0; -} - -static int waveform_ao_cancel(struct comedi_device *dev, - struct comedi_subdevice *s) -{ - struct waveform_private *devpriv = dev->private; - - s->async->inttrig = NULL; - if (in_softirq()) { - /* Assume we were called from the timer routine itself. */ - del_timer(&devpriv->ao_timer); - } else { - del_timer_sync(&devpriv->ao_timer); - } - return 0; -} - -static int waveform_ao_insn_write(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) -{ - struct waveform_private *devpriv = dev->private; - int i, chan = CR_CHAN(insn->chanspec); - - for (i = 0; i < insn->n; i++) - devpriv->ao_loopbacks[chan] = data[i]; - - return insn->n; -} - -static int waveform_ai_insn_config(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - if (data[0] == INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS) { - /* - * input: data[1], data[2] : scan_begin_src, convert_src - * output: data[1], data[2] : scan_begin_min, convert_min - */ - if (data[1] == TRIG_FOLLOW) { - /* exactly TRIG_FOLLOW case */ - data[1] = 0; - data[2] = NSEC_PER_USEC; - } else { - data[1] = NSEC_PER_USEC; - if (data[2] & TRIG_TIMER) - data[2] = NSEC_PER_USEC; - else - data[2] = 0; - } - return 0; - } - - return -EINVAL; -} - -static int waveform_ao_insn_config(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - if (data[0] == INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS) { - /* we don't care about actual channels */ - data[1] = NSEC_PER_USEC; /* scan_begin_min */ - data[2] = 0; /* convert_min */ - return 0; - } - - return -EINVAL; -} - -static int waveform_common_attach(struct comedi_device *dev, - int amplitude, int period) -{ - struct waveform_private *devpriv; - struct comedi_subdevice *s; - int i; - int ret; - - devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); - if (!devpriv) - return -ENOMEM; - - devpriv->wf_amplitude = amplitude; - devpriv->wf_period = period; - - ret = comedi_alloc_subdevices(dev, 2); - if (ret) - return ret; - - s = &dev->subdevices[0]; - dev->read_subdev = s; - /* analog input subdevice */ - s->type = COMEDI_SUBD_AI; - s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ; - s->n_chan = N_CHANS; - s->maxdata = 0xffff; - s->range_table = &waveform_ai_ranges; - s->len_chanlist = s->n_chan * 2; - s->insn_read = waveform_ai_insn_read; - s->do_cmd = waveform_ai_cmd; - s->do_cmdtest = waveform_ai_cmdtest; - s->cancel = waveform_ai_cancel; - s->insn_config = waveform_ai_insn_config; - - s = &dev->subdevices[1]; - dev->write_subdev = s; - /* analog output subdevice (loopback) */ - s->type = COMEDI_SUBD_AO; - s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE; - s->n_chan = N_CHANS; - s->maxdata = 0xffff; - s->range_table = &waveform_ai_ranges; - s->len_chanlist = s->n_chan; - s->insn_write = waveform_ao_insn_write; - s->insn_read = waveform_ai_insn_read; /* do same as AI insn_read */ - s->do_cmd = waveform_ao_cmd; - s->do_cmdtest = waveform_ao_cmdtest; - s->cancel = waveform_ao_cancel; - s->insn_config = waveform_ao_insn_config; - - /* Our default loopback value is just a 0V flatline */ - for (i = 0; i < s->n_chan; i++) - devpriv->ao_loopbacks[i] = s->maxdata / 2; - - devpriv->dev = dev; - timer_setup(&devpriv->ai_timer, waveform_ai_timer, 0); - timer_setup(&devpriv->ao_timer, waveform_ao_timer, 0); - - dev_info(dev->class_dev, - "%s: %u microvolt, %u microsecond waveform attached\n", - dev->board_name, - devpriv->wf_amplitude, devpriv->wf_period); - - return 0; -} - -static int waveform_attach(struct comedi_device *dev, - struct comedi_devconfig *it) -{ - int amplitude = it->options[0]; - int period = it->options[1]; - - /* set default amplitude and period */ - if (amplitude <= 0) - amplitude = 1000000; /* 1 volt */ - if (period <= 0) - period = 100000; /* 0.1 sec */ - - return waveform_common_attach(dev, amplitude, period); -} - -static int waveform_auto_attach(struct comedi_device *dev, - unsigned long context_unused) -{ - int amplitude = set_amplitude; - int period = set_period; - - /* set default amplitude and period */ - if (!amplitude) - amplitude = 1000000; /* 1 volt */ - if (!period) - period = 100000; /* 0.1 sec */ - - return waveform_common_attach(dev, amplitude, period); -} - -static void waveform_detach(struct comedi_device *dev) -{ - struct waveform_private *devpriv = dev->private; - - if (devpriv) { - del_timer_sync(&devpriv->ai_timer); - del_timer_sync(&devpriv->ao_timer); - } -} - -static struct comedi_driver waveform_driver = { - .driver_name = "comedi_test", - .module = THIS_MODULE, - .attach = waveform_attach, - .auto_attach = waveform_auto_attach, - .detach = waveform_detach, -}; - -/* - * For auto-configuration, a device is created to stand in for a - * real hardware device. - */ -static int __init comedi_test_init(void) -{ - int ret; - - ret = comedi_driver_register(&waveform_driver); - if (ret) { - pr_err("comedi_test: unable to register driver\n"); - return ret; - } - - if (!config_mode) { - ctcls = class_create(THIS_MODULE, CLASS_NAME); - if (IS_ERR(ctcls)) { - pr_warn("comedi_test: unable to create class\n"); - goto clean3; - } - - ctdev = device_create(ctcls, NULL, MKDEV(0, 0), NULL, DEV_NAME); - if (IS_ERR(ctdev)) { - pr_warn("comedi_test: unable to create device\n"); - goto clean2; - } - - ret = comedi_auto_config(ctdev, &waveform_driver, 0); - if (ret) { - pr_warn("comedi_test: unable to auto-configure device\n"); - goto clean; - } - } - - return 0; - -clean: - device_destroy(ctcls, MKDEV(0, 0)); -clean2: - class_destroy(ctcls); - ctdev = NULL; -clean3: - ctcls = NULL; - - return 0; -} -module_init(comedi_test_init); - -static void __exit comedi_test_exit(void) -{ - if (ctdev) - comedi_auto_unconfig(ctdev); - - if (ctcls) { - device_destroy(ctcls, MKDEV(0, 0)); - class_destroy(ctcls); - } - - comedi_driver_unregister(&waveform_driver); -} -module_exit(comedi_test_exit); - -MODULE_AUTHOR("Comedi https://www.comedi.org"); -MODULE_DESCRIPTION("Comedi low-level driver"); -MODULE_LICENSE("GPL"); |