On 01/03/2012 03:54 PM, Lars-Peter Clausen wrote:
> Add a small evtest like application to monitor events generated by an IIO
> device. The application can be used as an example on how to listen for IIO
> events and also is usful for testing and debugging device drivers which
> generate IIO events.
>
> Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Hi Jonathon,
You acked patch 1 and 2 of this series, but didn't comment on this one yet.
Thanks
- Lars
> ---
> .../staging/iio/Documentation/iio_event_monitor.c | 241 ++++++++++++++++++++
> 1 files changed, 241 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/iio/Documentation/iio_event_monitor.c
>
> diff --git a/drivers/staging/iio/Documentation/iio_event_monitor.c b/drivers/staging/iio/Documentation/iio_event_monitor.c
> new file mode 100644
> index 0000000..5ca9d05
> --- /dev/null
> +++ b/drivers/staging/iio/Documentation/iio_event_monitor.c
> @@ -0,0 +1,241 @@
> +/* Industrialio buffer test code.
> + *
> + * Copyright (c) 2011-2012 Lars-Peter Clausen <lars@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is primarily intended as an example application.
> + * Reads the current buffer setup from sysfs and starts a short capture
> + * from the specified device, pretty printing the result after appropriate
> + * conversion.
> + *
> + * Usage:
> + * iio_event_monitor <device_name>
> + *
> + */
> +
> +#define _GNU_SOURCE
> +
> +#include <unistd.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <poll.h>
> +#include <fcntl.h>
> +#include <sys/ioctl.h>
> +#include "iio_utils.h"
> +#include "../events.h"
> +
> +static const char * const iio_chan_type_name_spec[] = {
> + [IIO_VOLTAGE] = "voltage",
> + [IIO_CURRENT] = "current",
> + [IIO_POWER] = "power",
> + [IIO_ACCEL] = "accel",
> + [IIO_ANGL_VEL] = "anglvel",
> + [IIO_MAGN] = "magn",
> + [IIO_LIGHT] = "illuminance",
> + [IIO_INTENSITY] = "intensity",
> + [IIO_PROXIMITY] = "proximity",
> + [IIO_TEMP] = "temp",
> + [IIO_INCLI] = "incli",
> + [IIO_ROT] = "rot",
> + [IIO_ANGL] = "angl",
> + [IIO_TIMESTAMP] = "timestamp",
> + [IIO_CAPACITANCE] = "capacitance",
> +};
> +
> +static const char * const iio_ev_type_text[] = {
> + [IIO_EV_TYPE_THRESH] = "thresh",
> + [IIO_EV_TYPE_MAG] = "mag",
> + [IIO_EV_TYPE_ROC] = "roc",
> + [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
> + [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
> +};
> +
> +static const char * const iio_ev_dir_text[] = {
> + [IIO_EV_DIR_EITHER] = "either",
> + [IIO_EV_DIR_RISING] = "rising",
> + [IIO_EV_DIR_FALLING] = "falling"
> +};
> +
> +static const char * const iio_modifier_names[] = {
> + [IIO_MOD_X] = "x",
> + [IIO_MOD_Y] = "y",
> + [IIO_MOD_Z] = "z",
> + [IIO_MOD_LIGHT_BOTH] = "both",
> + [IIO_MOD_LIGHT_IR] = "ir",
> +};
> +
> +static bool event_is_known(struct iio_event_data *event)
> +{
> + enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
> + enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
> + enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
> + enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
> +
> + switch (type) {
> + case IIO_VOLTAGE:
> + case IIO_CURRENT:
> + case IIO_POWER:
> + case IIO_ACCEL:
> + case IIO_ANGL_VEL:
> + case IIO_MAGN:
> + case IIO_LIGHT:
> + case IIO_INTENSITY:
> + case IIO_PROXIMITY:
> + case IIO_TEMP:
> + case IIO_INCLI:
> + case IIO_ROT:
> + case IIO_ANGL:
> + case IIO_TIMESTAMP:
> + case IIO_CAPACITANCE:
> + break;
> + default:
> + return false;
> + }
> +
> + switch (mod) {
> + case IIO_NO_MOD:
> + case IIO_MOD_X:
> + case IIO_MOD_Y:
> + case IIO_MOD_Z:
> + case IIO_MOD_LIGHT_BOTH:
> + case IIO_MOD_LIGHT_IR:
> + break;
> + default:
> + return false;
> + }
> +
> + switch (ev_type) {
> + case IIO_EV_TYPE_THRESH:
> + case IIO_EV_TYPE_MAG:
> + case IIO_EV_TYPE_ROC:
> + case IIO_EV_TYPE_THRESH_ADAPTIVE:
> + case IIO_EV_TYPE_MAG_ADAPTIVE:
> + break;
> + default:
> + return false;
> + }
> +
> + switch (dir) {
> + case IIO_EV_DIR_EITHER:
> + case IIO_EV_DIR_RISING:
> + case IIO_EV_DIR_FALLING:
> + break;
> + default:
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static void print_event(struct iio_event_data *event)
> +{
> + enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
> + enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
> + enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
> + enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
> + int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
> + int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
> + bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
> +
> + if (!event_is_known(event)) {
> + printf("Unknown event: time: %lld, id: %llx\n",
> + event->timestamp, event->id);
> + return;
> + }
> +
> + printf("Event: time: %lld, ", event->timestamp);
> +
> + if (mod != IIO_NO_MOD) {
> + printf("type: %s(%s), ",
> + iio_chan_type_name_spec[type],
> + iio_modifier_names[mod]);
> + } else {
> + printf("type: %s, ",
> + iio_chan_type_name_spec[type]);
> + }
> +
> + if (diff && chan >= 0 && chan2 >= 0)
> + printf("channel: %d-%d, ", chan, chan2);
> + else if (chan >= 0)
> + printf("channel: %d, ", chan);
> +
> + printf("evtype: %s, direction: %s\n",
> + iio_ev_type_text[ev_type],
> + iio_ev_dir_text[dir]);
> +}
> +
> +int main(int argc, char **argv)
> +{
> + struct iio_event_data event;
> + const char *device_name;
> + char *chrdev_name;
> + int ret;
> + int dev_num;
> + int fd, event_fd;
> +
> + if (argc <= 1) {
> + printf("Usage: %s <device_name>\n", argv[0]);
> + return -1;
> + }
> +
> + device_name = argv[1];
> +
> + dev_num = find_type_by_name(device_name, "iio:device");
> + if (dev_num >= 0) {
> + printf("Found IIO device with name %s with device number %d\n",
> + device_name, dev_num);
> + ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
> + if (ret < 0) {
> + ret = -ENOMEM;
> + goto error_ret;
> + }
> + } else {
> + /* If we can't find a IIO device by name assume device_name is a
> + IIO chrdev */
> + chrdev_name = strdup(device_name);
> + }
> +
> + fd = open(chrdev_name, 0);
> + if (fd == -1) {
> + fprintf(stdout, "Failed to open %s\n", chrdev_name);
> + ret = -errno;
> + goto error_free_chrdev_name;
> + }
> +
> + ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
> +
> + close(fd);
> +
> + if (ret == -1 || event_fd == -1) {
> + fprintf(stdout, "Failed to retrieve event fd\n");
> + ret = -errno;
> + goto error_free_chrdev_name;
> + }
> +
> + while (true) {
> + ret = read(event_fd, &event, sizeof(event));
> + if (ret == -1) {
> + if (errno == EAGAIN) {
> + printf("nothing available\n");
> + continue;
> + } else {
> + perror("Failed to read event from device");
> + ret = -errno;
> + break;
> + }
> + }
> +
> + print_event(&event);
> + }
> +
> + close(event_fd);
> +error_free_chrdev_name:
> + free(chrdev_name);
> +error_ret:
> + return ret;
> +}
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