/*
- * Copyright (C) 2014 Intel Corporation.
+ * Copyright (C) 2014-2015 Intel Corporation.
*/
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <sys/epoll.h>
+#include <sys/ioctl.h>
#include <sys/socket.h>
#include <utils/Log.h>
#include <hardware/sensors.h>
+#include <linux/ioctl.h>
#include "control.h"
#include "enumeration.h"
#include "utils.h"
#include "description.h"
#include "filtering.h"
+/* Couple of temporary defines until we get a suitable linux/iio/events.h include */
+
+struct iio_event_data {
+ __u64 id;
+ __s64 timestamp;
+};
+
+#define IIO_GET_EVENT_FD_IOCTL _IOR('i', 0x90, int)
+
/* Currently active sensors count, per device */
static int poll_sensors_per_dev[MAX_DEVICES]; /* poll-mode sensors */
static int trig_sensors_per_dev[MAX_DEVICES]; /* trigger, event based */
static int device_fd[MAX_DEVICES]; /* fd on the /dev/iio:deviceX file */
+static int events_fd[MAX_DEVICES]; /* fd on the /sys/bus/iio/devices/iio:deviceX/events/<event_name> file */
static int has_iio_ts[MAX_DEVICES]; /* ts channel available on this iio dev */
static int expected_dev_report_size[MAX_DEVICES]; /* expected iio scan len */
static int poll_fd; /* epoll instance covering all enabled sensors */
return ret;
}
+static int enable_event(int dev_num, const char *name, int enabled)
+{
+ char sysfs_path[PATH_MAX];
+
+ sprintf(sysfs_path, EVENTS_PATH "%s", dev_num, name);
+ return sysfs_write_int(sysfs_path, enabled);
+}
static int enable_sensor(int dev_num, const char *tag, int enabled)
{
poll_sensors_per_dev[dev_num]--;
return 1;
}
+ case MODE_EVENT:
+ return 1;
default:
/* Invalid sensor mode */
return -1;
case SENSOR_TYPE_PROXIMITY: /* centimeters */
case SENSOR_TYPE_PRESSURE: /* hecto-pascal */
case SENSOR_TYPE_RELATIVE_HUMIDITY: /* percent */
+ case SENSOR_TYPE_STEP_DETECTOR: /* event: always 1 */
return 1;
case SENSOR_TYPE_ROTATION_VECTOR:
arb_sampling_rate = sensor[s].max_supported_rate;
}
+ /* Record the rate that was agreed upon with the sensor taken in isolation ; this avoid uncontrolled ripple effects between colocated sensor rates */
+ sensor[s].semi_arbitrated_rate = arb_sampling_rate;
+
/* Coordinate with others active sensors on the same device, if any */
if (per_device_sampling_rate)
for (n=0; n<sensor_count; n++)
- if (n != s && sensor[n].dev_num == dev_num && sensor[n].num_channels && is_enabled(n) && sensor[n].sampling_rate > arb_sampling_rate) {
+ if (n != s && sensor[n].dev_num == dev_num && sensor[n].num_channels && is_enabled(n) &&
+ sensor[n].semi_arbitrated_rate > arb_sampling_rate) {
ALOGV("Sampling rate shared between %s and %s, using %g instead of %g\n", sensor[s].friendly_name, sensor[n].friendly_name,
- sensor[n].sampling_rate, arb_sampling_rate);
- arb_sampling_rate = sensor[n].sampling_rate;
+ sensor[n].semi_arbitrated_rate, arb_sampling_rate);
+ arb_sampling_rate = sensor[n].semi_arbitrated_rate;
}
sensor[s].sampling_rate = arb_sampling_rate;
{
char device_name[PATH_MAX];
struct epoll_event ev = {0};
- int dev_fd;
- int ret;
+ int dev_fd, event_fd;
+ int ret, c, d;
int dev_num = sensor[s].dev_num;
size_t field_size;
int catalog_index = sensor[s].catalog_index;
device_fd[dev_num] = -1;
}
+ if (sensor[s].mode == MODE_EVENT) {
+ event_fd = events_fd[dev_num];
+
+ for (c = 0; c < sensor_catalog[catalog_index].num_channels; c++) {
+ for (d = 0; d < sensor_catalog[catalog_index].channel[c].num_events; d++)
+ enable_event(dev_num, sensor_catalog[catalog_index].channel[c].event[d].ev_en_path, enabled);
+ }
+
+ epoll_ctl(poll_fd, EPOLL_CTL_DEL, event_fd, NULL);
+ close(event_fd);
+ events_fd[dev_num] = -1;
+
+ }
+
/* Release any filtering data we may have accumulated */
release_noise_filtering_data(s);
}
/* Note: poll-mode fds are not readable */
+ } else if (sensor[s].mode == MODE_EVENT) {
+ event_fd = events_fd[dev_num];
+
+ ret = ioctl(dev_fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
+ if (ret == -1 || event_fd == -1) {
+ ALOGE("Failed to retrieve event_fd from %d (%s)\n", dev_fd, strerror(errno));
+ return -1;
+ }
+ events_fd[dev_num] = event_fd;
+ ALOGV("Opened fd=%d to receive events\n", event_fd);
+
+ /* Add this event fd to the set of watched fds */
+ ev.events = EPOLLIN;
+ ev.data.u32 = dev_num;
+
+ ret = epoll_ctl(poll_fd, EPOLL_CTL_ADD, event_fd, &ev);
+ if (ret == -1) {
+ ALOGE("Failed adding %d to poll set (%s)\n", event_fd, strerror(errno));
+ return -1;
+ }
+ for (c = 0; c < sensor_catalog[catalog_index].num_channels; c++) {
+ int d;
+ for (d = 0; d < sensor_catalog[catalog_index].channel[c].num_events; d++)
+ enable_event(dev_num, sensor_catalog[catalog_index].channel[c].event[d].ev_en_path, enabled);
+ }
+
+ if (!poll_sensors_per_dev[dev_num] && !trig_sensors_per_dev[dev_num]) {
+ close(dev_fd);
+ device_fd[dev_num] = -1;
+ }
}
}
}
-static int integrate_device_report (int dev_num)
+static int integrate_device_report_from_dev(int dev_num, int fd)
{
int len;
int s,c;
int64_t boot_to_rt_delta;
/* There's an incoming report on the specified iio device char dev fd */
-
- if (dev_num < 0 || dev_num >= MAX_DEVICES) {
- ALOGE("Event reported on unexpected iio device %d\n", dev_num);
- return -1;
- }
-
- if (device_fd[dev_num] == -1) {
+ if (fd == -1) {
ALOGE("Ignoring stale report on iio device %d\n", dev_num);
return -1;
}
- len = read(device_fd[dev_num], buf, expected_dev_report_size[dev_num]);
+ len = read(fd, buf, expected_dev_report_size[dev_num]);
if (len == -1) {
ALOGE("Could not read report from iio device %d (%s)\n", dev_num, strerror(errno));
return 0;
}
+static int integrate_device_report_from_event(int dev_num, int fd)
+{
+ int len, s;
+ int64_t ts;
+ struct iio_event_data event;
+
+ /* There's an incoming report on the specified iio device char dev fd */
+ if (fd == -1) {
+ ALOGE("Ignoring stale report on event fd %d of device %d\n",
+ fd, dev_num);
+ return -1;
+ }
+
+ len = read(fd, &event, sizeof(event));
+
+ if (len == -1) {
+ ALOGE("Could not read event from fd %d of device %d (%s)\n",
+ fd, dev_num, strerror(errno));
+ return -1;
+ }
+
+ ts = event.timestamp;
+
+ ALOGV("Read event %lld from fd %d of iio device %d\n", event.id, fd, dev_num);
+
+ /* Map device report to sensor reports */
+ for (s = 0; s < MAX_SENSORS; s++)
+ if (sensor[s].dev_num == dev_num &&
+ is_enabled(s)) {
+ sensor[s].report_ts = ts;
+ sensor[s].report_pending = 1;
+ sensor[s].report_initialized = 1;
+ ALOGV("Sensor %d report available (1 byte)\n", s);
+ }
+ return 0;
+}
+
+static int integrate_device_report(int dev_num)
+{
+ int ret = 0;
+
+ if (dev_num < 0 || dev_num >= MAX_DEVICES) {
+ ALOGE("Event reported on unexpected iio device %d\n", dev_num);
+ return -1;
+ }
+
+ if (events_fd[dev_num] != -1) {
+ ret = integrate_device_report_from_event(dev_num, events_fd[dev_num]);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (device_fd[dev_num] != -1)
+ ret = integrate_device_report_from_dev(dev_num, device_fd[dev_num]);
+
+ return ret;
+}
static int propagate_vsensor_report (int s, sensors_event_t *data)
{
data->type = sensor[s].type;
data->timestamp = sensor[s].report_ts;
+ if (sensor[s].mode == MODE_EVENT) {
+ ALOGV("Reporting event\n");
+ /* Android requires events to return 1.0 */
+ data->data[0] = 1.0;
+ data->data[1] = 0.0;
+ data->data[2] = 0.0;
+ return 1;
+ }
+
/* Convert the data into the expected Android-level format */
current_sample = sensor[s].report_buffer;
{
int i;
- for (i=0; i<MAX_DEVICES; i++)
+ for (i=0; i<MAX_DEVICES; i++) {
device_fd[i] = -1;
+ events_fd[i] = -1;
+ }
poll_fd = epoll_create(MAX_DEVICES);
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