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als.c
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als.c
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#include <sensor.h>
#include <udev.h>
#include <iio.h>
#include <sys/time.h>
#include "als.h"
#define ALS_NAME "Als"
#define ALS_SUBSYSTEM "iio"
#define PROCESS_CHANNEL_BITS(bits) val = ((int##bits##_t*)p_dat)[i];
// Buffer method has higher prio. See https://gitlab.freedesktop.org/hadess/iio-sensor-proxy/-/merge_requests/352.
typedef enum { ALS_IIO_BUFFER, ALS_IIO_POLL, ALS_IIO_MAX } als_iio_types;
typedef struct als_device {
struct udev_device *dev;
const char *attr_name[ALS_IIO_MAX];
double (*capture[ALS_IIO_MAX])(struct als_device *als, double *pct, const int num_captures, int interval);
} als_device_t;
SENSOR(ALS_NAME);
/* properties names to be checked. "in_illuminance_input" has higher priority. */
static const char *ill_poll_names[] = { "in_illuminance_input", "in_illuminance0_input", "in_illuminance_raw", "in_intensity_clear_raw" };
static const char *ill_buff_names[] = { "scan_elements/in_illuminance_en", "scan_elements/in_intensity_both_en" };
static const char *scale_names[] = { "in_illuminance_scale", "in_intensity_scale" };
static struct udev_monitor *mon;
static double iio_poll_capture(struct als_device *als, double *pct, const int num_captures, int interval) {
const char *syspath = udev_device_get_syspath(als->dev);
INFO("[IIO-POLL] Start capture: '%s' syspath.\n", syspath);
// Load scale value
const char *val = NULL;
double scale = 1.0; // defaults to 1.0
for (int i = 0; i < SIZE(scale_names) && !val; i++) {
val = udev_device_get_sysattr_value(als->dev, scale_names[i]);
if (val) {
scale = atof(val);
}
}
INFO("[IIO-POLL] Loaded scale: %f.\n", scale);
int ctr = 0;
for (int i = 0; i < num_captures; i++) {
struct udev_device *non_cached_dev = udev_device_new_from_syspath(udev, syspath);
val = udev_device_get_sysattr_value(non_cached_dev, als->attr_name[ALS_IIO_POLL]);
INFO("[IIO-POLL] Read: %s.\n", val);
if (val) {
double illuminance = atof(val) * scale;
ctr++;
pct[i] = compute_value(illuminance);
INFO("[IIO-POLL] Pct[%d] = %lf\n", i, pct[i]);
}
udev_device_unref(non_cached_dev);
usleep(interval * 1000);
}
return ctr;
}
static double iio_buffer_capture(struct als_device *als, double *pct, const int num_captures, int interval) {
int ctr = 0;
const char *sysname = udev_device_get_sysname(als->dev);
INFO("[IIO-BUF] Start capture: '%s' sysname.\n", sysname);
/* Getting local iio device context */
struct iio_context *local_ctx = iio_create_local_context();
if (!local_ctx) {
fprintf(stderr, "Failed to create local iio ctx.\n");
return ctr;
}
const struct iio_device *dev = iio_context_find_device(local_ctx, sysname);
if (!dev) {
fprintf(stderr, "Couldn't find device '%s': %m\n", sysname);
return ctr;
}
INFO("[IIO-BUF] Found device.\n");
// Compute channel name from attribute ("illuminance" or "intensity_both")
char *name = strrchr(als->attr_name[ALS_IIO_BUFFER], '/') + 1; // "scan_elements/in_illuminance_en" -> "in_illuminance_en"
name = strchr(name, '_') + 1; // "in_illuminance_en" -> "illuminance_en"
char *ptr = strrchr(name, '_');
char channel_name[64];
snprintf(channel_name, strlen(name) - strlen(ptr) + 1, "%s", name); // "illuminance_en" -> "illuminance"
INFO("[IIO-BUF] Channel name: '%s'.\n", channel_name);
struct iio_channel *ch = iio_device_find_channel(dev, channel_name, false);
if (!ch) {
fprintf(stderr, "Failed to fetch '%s' channel: %m\n", channel_name);
return ctr;
}
if (iio_channel_is_output(ch)) {
fprintf(stderr, "Wrong output channel selected.\n");
return ctr;
}
if (!iio_channel_is_scan_element(ch)) {
fprintf(stderr, "Channel is not a scan element.\n");
return ctr;
}
iio_channel_enable(ch);
if (!iio_channel_is_enabled(ch)) {
fprintf(stderr, "Failed to enable channel '%s'!\n", channel_name);
return ctr;
}
INFO("[IIO-BUF] Creating buffer.\n");
struct iio_buffer *rxbuf = iio_device_create_buffer(dev, 1, false);
if (!rxbuf) {
fprintf(stderr, "Failed to allocated buffer: %m\n");
return ctr;
}
// Load scale
double scale = 1.0; // default to 1.0
const struct iio_data_format *fmt = iio_channel_get_data_format(ch);
if (!fmt) {
fprintf(stderr, "Failed to fetch channel format.\n");
return ctr;
}
if (fmt->with_scale) {
scale = fmt->scale;
}
INFO("[IIO-BUF] Data fmt: bits: %d | signed: %d | len: %d | rep: %d | scale: %f | has_scale: %d | shift: %d.\n",
fmt->bits, fmt->is_signed, fmt->length, fmt->repeat, fmt->scale, fmt->with_scale, fmt->shift);
const size_t read_size = fmt->bits / 8;
for (int i = 0; i < num_captures; i++) {
int ret = iio_buffer_refill(rxbuf);
INFO("[IIO-BUF] Refill ret: %d/%ld\n", ret, read_size);
if (ret == read_size) {
int64_t val = 0;
if (ret == read_size) {
iio_channel_read(ch, rxbuf, &val, read_size);
INFO("[IIO-BUF] Read %ld\n", val);
double illuminance = (double)val * scale;
ctr++;
pct[i] = compute_value(illuminance);
INFO("[IIO-BUF] Pct[%d] = %lf\n", i, pct[i]);
}
}
usleep(interval * 1000);
}
iio_buffer_destroy(rxbuf);
iio_context_destroy(local_ctx);
return ctr;
}
static bool validate_dev(void *dev) {
als_device_t *als = (als_device_t *)dev;
bool valid = false;
/* Check if device exposes any of the requested sysattrs */
for (int i = 0; i < SIZE(ill_buff_names); i++) {
if (udev_device_get_sysattr_value(als->dev, ill_buff_names[i])) {
als->attr_name[ALS_IIO_BUFFER] = ill_buff_names[i];
als->capture[ALS_IIO_BUFFER] = iio_buffer_capture;
valid = true;
INFO("Buffer available, using '%s' sysattr\n", ill_buff_names[i]);
break;
}
}
for (int i = 0; i < SIZE(ill_poll_names); i++) {
if (udev_device_get_sysattr_value(als->dev, ill_poll_names[i])) {
als->attr_name[ALS_IIO_POLL] = ill_poll_names[i];
als->capture[ALS_IIO_POLL] = iio_poll_capture;
valid = true;
INFO("Poll available, using '%s' sysattr\n", ill_poll_names[i]);
break;
}
}
return valid;
}
static void fetch_dev(const char *interface, void **dev) {
struct udev_device *d = NULL;
/* Check if any device exposes requested sysattr */
for (int i = 0; i < SIZE(ill_buff_names) && !d; i++) {
/* Only check existence for needed sysattr */
const udev_match match = { .sysattr_key = ill_buff_names[i] };
get_udev_device(interface, ALS_SUBSYSTEM, &match, NULL, &d);
}
if (!d) {
for (int i = 0; i < SIZE(ill_poll_names) && !d; i++) {
/* Only check existence for needed sysattr */
const udev_match match = { .sysattr_key = ill_poll_names[i] };
get_udev_device(interface, ALS_SUBSYSTEM, &match, NULL, &d);
}
}
if (d) {
als_device_t *als = calloc(1, sizeof(als_device_t));
als->dev = d;
*dev = als;
}
}
static void fetch_props_dev(void *dev, const char **node, const char **action) {
als_device_t *als = (als_device_t *)dev;
if (node) {
*node = udev_device_get_devnode(als->dev);
}
if (action) {
*action = udev_device_get_action(als->dev);
}
}
static void destroy_dev(void *dev) {
als_device_t *als = (als_device_t *)dev;
udev_device_unref(als->dev);
free(als);
}
static int init_monitor(void) {
return init_udev_monitor(ALS_SUBSYSTEM, &mon);
}
static void recv_monitor(void **dev) {
struct udev_device *d = udev_monitor_receive_device(mon);
als_device_t *als = calloc(1, sizeof(als_device_t));
als->dev = d;
*dev = als;
}
static void destroy_monitor(void) {
udev_monitor_unref(mon);
}
static int capture(void *dev, double *pct, const int num_captures, char *settings) {
int interval;
parse_settings(settings, &interval);
als_device_t *als = (als_device_t *)dev;
int ret = 0;
// Try buffer then poll methods, if both are available
for (int i = 0; i < ALS_IIO_MAX && ret == 0; i++) {
if (als->capture[i]) {
ret = als->capture[i](als, pct, num_captures, interval);
}
}
return ret;
}