#include "iio.h"
#include "mraa_internal.h"
+#include "dirent.h"
+#include <string.h>
+#include <poll.h>
+
+#define MAX_SIZE 128
+#define IIO_DEVICE "iio:device"
+#define IIO_SCAN_ELEM "scan_elements"
+#define IIO_SLASH_DEV "/dev/"IIO_DEVICE
+#define IIO_SYSFS_DEVICE "/sys/bus/iio/devices/"IIO_DEVICE
+#define IIO_EVENTS "events"
mraa_iio_context
mraa_iio_init(int device)
{
- if (device > plat->iio_device_count) {
+ if (device > plat_iio->iio_device_count) {
return NULL;
}
- return &plat->iio_devices[device];
+
+ mraa_iio_get_channel_data(&plat_iio->iio_devices[device]);
+ mraa_iio_get_event_data(&plat_iio->iio_devices[device]);
+
+ return &plat_iio->iio_devices[device];
+}
+
+int
+mraa_iio_read_size(mraa_iio_context dev)
+{
+ return dev->datasize;
+}
+
+mraa_iio_channel*
+mraa_iio_get_channels(mraa_iio_context dev)
+{
+ return dev->channels;
}
int
mraa_iio_get_channel_count(mraa_iio_context dev)
{
- return 1;
+ return dev->chan_num;
}
mraa_result_t
-mraa_iio_read(mraa_iio_context dev, int channel, const char* attribute, float* data)
+mraa_iio_get_channel_data(mraa_iio_context dev)
+{
+ const struct dirent *ent;
+ DIR* dir;
+ int chan_num = 0;
+ char buf[MAX_SIZE];
+ char readbuf[32];
+ int fd;
+ int ret = 0;
+ int padint = 0;
+ int curr_bytes = 0;
+ char shortbuf, signchar;
+
+ dev->datasize = 0;
+
+ memset(buf, 0, MAX_SIZE);
+ snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM, dev->num);
+ dir = opendir(buf);
+ if (dir != NULL) {
+ while ((ent = readdir(dir)) != NULL) {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
+ chan_num++;
+ }
+ }
+ }
+ dev->chan_num = chan_num;
+ //no need proceed if no channel found
+ if (chan_num == 0)
+ return MRAA_SUCCESS;
+ mraa_iio_channel* chan;
+ dev->channels = calloc(chan_num, sizeof(mraa_iio_channel));
+ seekdir(dir, 0);
+ while ((ent = readdir(dir)) != NULL) {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_index"), "_index") == 0) {
+ snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM "/%s", dev->num, ent->d_name);
+ fd = open(buf, O_RDONLY);
+ if (fd > 0) {
+ if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
+ break;
+ }
+ chan_num = ((int) strtol(readbuf, NULL, 10));
+ chan = &dev->channels[chan_num];
+ chan->index = chan_num;
+ close(fd);
+
+ buf[(strlen(buf)-5)] = '\0';
+ char* str = strdup(buf);
+ // grab the type of the buffer
+ snprintf(buf, MAX_SIZE, "%stype", str);
+ fd = open(buf, O_RDONLY);
+ if (fd > 0) {
+ read(fd, readbuf, 31 * sizeof(char));
+ ret = sscanf(readbuf, "%ce:%c%u/%u>>%u", &shortbuf,
+ &signchar, &chan->bits_used,
+ &padint, &chan->shift);
+ chan->bytes = padint / 8;
+ if (curr_bytes % chan->bytes == 0) {
+ chan->location = curr_bytes;
+ } else {
+ chan->location = curr_bytes - curr_bytes%chan->bytes + chan->bytes;
+ }
+ curr_bytes = chan->location + chan->bytes;
+ // probably should be 5?
+ if (ret < 0) {
+ // cleanup
+ free(str);
+ close(fd);
+ return MRAA_IO_SETUP_FAILURE;
+ }
+ chan->signedd = (signchar == 's');
+ chan->lendian = (shortbuf == 'l');
+ if (chan->bits_used == 64) {
+ chan->mask = ~0;
+ } else {
+ chan->mask = (1 << chan->bits_used) - 1;
+ }
+ close(fd);
+ }
+ // grab the enable flag of channel
+ snprintf(buf, MAX_SIZE, "%sen", str);
+ fd = open(buf, O_RDONLY);
+ if (fd > 0) {
+ if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
+ syslog(LOG_ERR, "iio: Failed to read a sensible value from sysfs");
+ return -1;
+ }
+ chan->enabled = (int) strtol(readbuf, NULL, 10);
+ //only calculate enable buffer size for trigger buffer extract data
+ if (chan->enabled) {
+ dev->datasize += chan->bytes;
+ }
+ close(fd);
+ }
+ // clean up str var
+ free(str);
+ }
+ }
+ }
+
+ return MRAA_SUCCESS;
+}
+
+const char*
+mraa_iio_get_device_name(mraa_iio_context dev)
+{
+ return dev->name;
+}
+
+int
+mraa_iio_get_device_num_by_name(const char* name)
+{
+ int i;
+
+ if (plat_iio == NULL) {
+ syslog(LOG_ERR, "iio: platform IIO structure is not initialized");
+ return -1;
+ }
+
+ if (name == NULL) {
+ syslog(LOG_ERR, "iio: device name is NULL, unable to find its number");
+ return -1;
+ }
+
+ for (i = 0; i < plat_iio->iio_device_count; i++) {
+ struct _iio* device;
+ device = &plat_iio->iio_devices[i];
+ // we want to check for exact match
+ if (strncmp(device->name, name, strlen(device->name)+1) == 0) {
+ return device->num;
+ }
+ }
+
+ return -1;
+}
+
+mraa_result_t
+mraa_iio_read(mraa_iio_context dev, const char* attr_chan, float* data)
{
char buf[64];
- snprintf(buf, 64, "/sys/bus/iio/devices/iio:device%d/in_voltage%d_%s", dev->num, channel, attribute);
+ snprintf(buf, 64, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
int fd = open(buf, O_RDONLY);
if (fd != -1) {
int len = read(fd, &buf, 64);
}
mraa_result_t
-mraa_iio_write(mraa_iio_context dev, int channel, const char* attribute)
+mraa_iio_write(mraa_iio_context dev, const char* attr_chan, const char* data)
+{
+ char buf[128];
+ snprintf(buf, 128, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
+ int fd = open(buf, O_WRONLY);
+ if (fd != -1) {
+ write(fd, data, (strlen(data)+1));
+ return MRAA_SUCCESS;
+ }
+ return MRAA_ERROR_UNSPECIFIED;
+}
+
+static mraa_result_t
+mraa_iio_wait_event(int fd, char* data, int *read_size)
+{
+ struct pollfd pfd;
+
+ if (fd < 0) {
+ return MRAA_ERROR_INVALID_RESOURCE;
+ }
+
+ pfd.fd = fd;
+ pfd.events = POLLIN;
+
+ // Wait for it forever or until pthread_cancel
+ // poll is a cancelable point like sleep()
+ int x = poll(&pfd, 1, -1);
+
+ memset(data, 0, 100);
+ *read_size = read(fd, data, 100);
+
+ return MRAA_SUCCESS;
+}
+
+static void*
+mraa_iio_trigger_handler(void* arg)
+{
+ mraa_iio_context dev = (mraa_iio_context) arg;
+ int i;
+ char data[MAX_SIZE*100];
+ int read_size;
+
+ for (;;) {
+ if (mraa_iio_wait_event(dev->fp, &data[0], &read_size) == MRAA_SUCCESS) {
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
+ //only can process if readsize >= enabled channel's datasize
+ for (i=0; i<(read_size/dev->datasize); i++) {
+ dev->isr(&data);
+ }
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+ } else {
+ // we must have got an error code so die nicely
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
+ return NULL;
+ }
+ }
+}
+
+mraa_result_t
+mraa_iio_trigger_buffer(mraa_iio_context dev, void (*fptr)(char* data), void* args)
{
- return MRAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+ char bu[MAX_SIZE];
+ if (dev->thread_id != 0) {
+ return MRAA_ERROR_NO_RESOURCES;
+ }
+
+ sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
+ dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
+ if (dev->fp == -1) {
+ return MRAA_ERROR_INVALID_RESOURCE;
+ }
+
+ dev->isr = fptr;
+ pthread_create(&dev->thread_id, NULL, mraa_iio_trigger_handler, (void*) dev);
+
+ return MRAA_SUCCESS;
}
mraa_result_t
+mraa_iio_get_event_data(mraa_iio_context dev)
+{
+ const struct dirent *ent;
+ DIR* dir;
+ int event_num = 0;
+ char buf[MAX_SIZE];
+ char readbuf[32];
+ int fd;
+ int ret = 0;
+ int padint = 0;
+ int curr_bytes = 0;
+ char shortbuf, signchar;
+ memset(buf, 0, MAX_SIZE);
+ snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS, dev->num);
+ dir = opendir(buf);
+ if (dir != NULL) {
+ while ((ent = readdir(dir)) != NULL) {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
+ event_num++;
+ }
+ }
+ dev->event_num = event_num;
+ //no need proceed if no event found
+ if (event_num == 0)
+ return MRAA_SUCCESS;
+ mraa_iio_event* event;
+ dev->events = calloc(event_num, sizeof(mraa_iio_event));
+ if ( dev->events == NULL)
+ {
+ closedir(dir);
+ return MRAA_ERROR_UNSPECIFIED;
+ }
+ rewinddir(dir);
+ event_num = 0;
+ while ((ent = readdir(dir)) != NULL)
+ {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
+ event = &dev->events[event_num];
+ event->name = strdup(ent->d_name);
+ snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, ent->d_name);
+ fd = open(buf, O_RDONLY);
+ if (fd > 0) {
+ if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
+ break;
+ }
+ close(fd);
+ }
+ event->enabled = ((int) strtol(readbuf, NULL, 10));
+ //Todo, read other event info.
+ event_num++;
+ }
+ }
+ closedir(dir);
+ }
+ return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_iio_event_read(mraa_iio_context dev, const char* attribute, float* data)
+{
+ char buf[64];
+ snprintf(buf, 64, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
+ int fd = open(buf, O_RDONLY);
+ if (fd != -1) {
+ int len = read(fd, &buf, 64);
+ *data = strtol(buf, NULL, 10);
+ return MRAA_SUCCESS;
+ }
+ return MRAA_ERROR_UNSPECIFIED;
+}
+
+mraa_result_t
+mraa_iio_event_write(mraa_iio_context dev, const char* attribute, const char* data)
+{
+ int len;
+ char buf[128];
+ snprintf(buf, 128, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
+ int fd = open(buf, O_WRONLY);
+ if (fd != -1) {
+ int len = write(fd, data, ( strlen(data) +1 ));
+ return MRAA_SUCCESS;
+ }
+ return MRAA_ERROR_UNSPECIFIED;
+}
+
+static mraa_result_t
+mraa_iio_event_poll_nonblock(int fd, struct iio_event_data* data)
+{
+ struct pollfd pfd;
+
+ if (fd < 0) {
+ return MRAA_ERROR_INVALID_RESOURCE;
+ }
+
+ pfd.fd = fd;
+ pfd.events = POLLIN;
+
+ // Wait for it forever or until pthread_cancel
+ // poll is a cancelable point like sleep()
+ int x = poll(&pfd, 1, -1);
+
+ read(fd, data, sizeof(struct iio_event_data));
+
+ return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_iio_event_poll(mraa_iio_context dev, struct iio_event_data* data)
+{
+ char bu[MAX_SIZE];
+ int ret;
+ int event_fd;
+ int fd;
+
+ sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
+ fd = open(bu, 0);
+ ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
+ close(fd);
+
+ if (ret == -1 || event_fd == -1)
+ return MRAA_ERROR_UNSPECIFIED;
+
+ ret = read(event_fd, data, sizeof(struct iio_event_data));
+
+ close(event_fd);
+ return MRAA_SUCCESS;
+}
+
+static void*
+mraa_iio_event_handler(void* arg)
+{
+ struct iio_event_data data;
+ mraa_iio_context dev = (mraa_iio_context) arg;
+
+ for (;;) {
+ if (mraa_iio_event_poll_nonblock(dev->fp_event, &data) == MRAA_SUCCESS) {
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
+ dev->isr_event(&data);
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+ } else {
+ // we must have got an error code so die nicely
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
+ return NULL;
+ }
+ }
+}
+
+mraa_result_t
+mraa_iio_event_setup_callback(mraa_iio_context dev, void (*fptr)(struct iio_event_data* data), void* args)
+{
+ int ret;
+ char bu[MAX_SIZE];
+ if (dev->thread_id != 0) {
+ return MRAA_ERROR_NO_RESOURCES;
+ }
+
+ sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
+ dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
+ if (dev->fp == -1) {
+ return MRAA_ERROR_INVALID_RESOURCE;
+ }
+ ret = ioctl(dev->fp, IIO_GET_EVENT_FD_IOCTL, &dev->fp_event);
+ close(dev->fp);
+
+ if (ret == -1 || dev->fp_event == -1)
+ {
+ return MRAA_ERROR_UNSPECIFIED;
+ }
+
+ dev->isr_event = fptr;
+ pthread_create(&dev->thread_id, NULL, mraa_iio_event_handler, (void*) dev);
+
+ return MRAA_SUCCESS;
+}
+
+mraa_result_t
+mraa_iio_event_extract_event(struct iio_event_data* event, int* chan_type, int* modifier, int* type, int* direction, int* channel, int* channel2, int* different)
+{
+ *chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
+ *modifier= IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
+ *type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
+ *direction = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
+ *channel = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
+ *channel2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
+ *different = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
+ return MRAA_SUCCESS;
+}
+#if 0
+// does stop make any sense on iio devices?
+mraa_result_t
mraa_iio_stop(mraa_iio_context dev)
{
- free(dev);
return MRAA_SUCCESS;
}
+#endif
projects / contrib / mraa.git / blobdiff