2 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
3 * Copyright (c) 2015 Intel Corporation.
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include "mraa_internal.h"
33 #define IIO_DEVICE "iio:device"
34 #define IIO_SCAN_ELEM "scan_elements"
35 #define IIO_SLASH_DEV "/dev/"IIO_DEVICE
36 #define IIO_SYSFS_DEVICE "/sys/bus/iio/devices/"IIO_DEVICE
37 #define IIO_EVENTS "events"
40 mraa_iio_init(int device)
42 if (device > plat_iio->iio_device_count) {
46 mraa_iio_get_channel_data(&plat_iio->iio_devices[device]);
47 mraa_iio_get_event_data(&plat_iio->iio_devices[device]);
49 return &plat_iio->iio_devices[device];
53 mraa_iio_read_size(mraa_iio_context dev)
59 mraa_iio_get_channels(mraa_iio_context dev)
65 mraa_iio_get_channel_count(mraa_iio_context dev)
71 mraa_iio_get_channel_data(mraa_iio_context dev)
73 const struct dirent *ent;
82 char shortbuf, signchar;
86 memset(buf, 0, MAX_SIZE);
87 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM, dev->num);
90 while ((ent = readdir(dir)) != NULL) {
91 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
96 dev->chan_num = chan_num;
97 //no need proceed if no channel found
100 mraa_iio_channel* chan;
101 dev->channels = calloc(chan_num, sizeof(mraa_iio_channel));
103 while ((ent = readdir(dir)) != NULL) {
104 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_index"), "_index") == 0) {
105 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM "/%s", dev->num, ent->d_name);
106 fd = open(buf, O_RDONLY);
108 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
111 chan_num = ((int) strtol(readbuf, NULL, 10));
112 chan = &dev->channels[chan_num];
113 chan->index = chan_num;
116 buf[(strlen(buf)-5)] = '\0';
117 char* str = strdup(buf);
118 // grab the type of the buffer
119 snprintf(buf, MAX_SIZE, "%stype", str);
120 fd = open(buf, O_RDONLY);
122 read(fd, readbuf, 31 * sizeof(char));
123 ret = sscanf(readbuf, "%ce:%c%u/%u>>%u", &shortbuf,
124 &signchar, &chan->bits_used,
125 &padint, &chan->shift);
126 chan->bytes = padint / 8;
127 if (curr_bytes % chan->bytes == 0) {
128 chan->location = curr_bytes;
130 chan->location = curr_bytes - curr_bytes%chan->bytes + chan->bytes;
132 curr_bytes = chan->location + chan->bytes;
133 // probably should be 5?
138 return MRAA_IO_SETUP_FAILURE;
140 chan->signedd = (signchar == 's');
141 chan->lendian = (shortbuf == 'l');
142 if (chan->bits_used == 64) {
145 chan->mask = (1 << chan->bits_used) - 1;
149 // grab the enable flag of channel
150 snprintf(buf, MAX_SIZE, "%sen", str);
151 fd = open(buf, O_RDONLY);
153 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
154 syslog(LOG_ERR, "iio: Failed to read a sensible value from sysfs");
157 chan->enabled = (int) strtol(readbuf, NULL, 10);
158 //only calculate enable buffer size for trigger buffer extract data
160 dev->datasize += chan->bytes;
174 mraa_iio_get_device_name(mraa_iio_context dev)
180 mraa_iio_get_device_num_by_name(const char* name)
184 if (plat_iio == NULL) {
185 syslog(LOG_ERR, "iio: platform IIO structure is not initialized");
190 syslog(LOG_ERR, "iio: device name is NULL, unable to find its number");
194 for (i = 0; i < plat_iio->iio_device_count; i++) {
196 device = &plat_iio->iio_devices[i];
197 // we want to check for exact match
198 if (strncmp(device->name, name, strlen(device->name)+1) == 0) {
207 mraa_iio_read(mraa_iio_context dev, const char* attr_chan, float* data)
210 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
211 int fd = open(buf, O_RDONLY);
213 int len = read(fd, &buf, MAX_SIZE);
214 *data = strtol(buf, NULL, 10);
217 return MRAA_ERROR_UNSPECIFIED;
221 mraa_iio_write(mraa_iio_context dev, const char* attr_chan, const char* data)
224 snprintf(buf, 128, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
225 int fd = open(buf, O_WRONLY);
227 write(fd, data, (strlen(data)+1));
230 return MRAA_ERROR_UNSPECIFIED;
234 mraa_iio_wait_event(int fd, char* data, int *read_size)
239 return MRAA_ERROR_INVALID_RESOURCE;
245 // Wait for it forever or until pthread_cancel
246 // poll is a cancelable point like sleep()
247 int x = poll(&pfd, 1, -1);
249 memset(data, 0, 100);
250 *read_size = read(fd, data, 100);
256 mraa_iio_trigger_handler(void* arg)
258 mraa_iio_context dev = (mraa_iio_context) arg;
260 char data[MAX_SIZE*100];
264 if (mraa_iio_wait_event(dev->fp, &data[0], &read_size) == MRAA_SUCCESS) {
265 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
266 //only can process if readsize >= enabled channel's datasize
267 for (i=0; i<(read_size/dev->datasize); i++) {
270 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
272 // we must have got an error code so die nicely
273 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
280 mraa_iio_trigger_buffer(mraa_iio_context dev, void (*fptr)(char* data), void* args)
283 if (dev->thread_id != 0) {
284 return MRAA_ERROR_NO_RESOURCES;
287 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
288 dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
290 return MRAA_ERROR_INVALID_RESOURCE;
294 pthread_create(&dev->thread_id, NULL, mraa_iio_trigger_handler, (void*) dev);
300 mraa_iio_get_event_data(mraa_iio_context dev)
302 const struct dirent *ent;
311 char shortbuf, signchar;
312 memset(buf, 0, MAX_SIZE);
313 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS, dev->num);
316 while ((ent = readdir(dir)) != NULL) {
317 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
321 dev->event_num = event_num;
322 //no need proceed if no event found
325 mraa_iio_event* event;
326 dev->events = calloc(event_num, sizeof(mraa_iio_event));
327 if ( dev->events == NULL)
330 return MRAA_ERROR_UNSPECIFIED;
334 while ((ent = readdir(dir)) != NULL)
336 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
337 event = &dev->events[event_num];
338 event->name = strdup(ent->d_name);
339 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, ent->d_name);
340 fd = open(buf, O_RDONLY);
342 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
347 event->enabled = ((int) strtol(readbuf, NULL, 10));
348 //Todo, read other event info.
358 mraa_iio_event_read(mraa_iio_context dev, const char* attribute, float* data)
361 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
362 int fd = open(buf, O_RDONLY);
364 int len = read(fd, &buf, MAX_SIZE);
365 *data = strtol(buf, NULL, 10);
368 return MRAA_ERROR_UNSPECIFIED;
372 mraa_iio_event_write(mraa_iio_context dev, const char* attribute, const char* data)
376 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
377 int fd = open(buf, O_WRONLY);
379 int len = write(fd, data, ( strlen(data) +1 ));
382 return MRAA_ERROR_UNSPECIFIED;
386 mraa_iio_event_poll_nonblock(int fd, struct iio_event_data* data)
391 return MRAA_ERROR_INVALID_RESOURCE;
397 // Wait for it forever or until pthread_cancel
398 // poll is a cancelable point like sleep()
399 int x = poll(&pfd, 1, -1);
401 read(fd, data, sizeof(struct iio_event_data));
407 mraa_iio_event_poll(mraa_iio_context dev, struct iio_event_data* data)
414 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
416 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
419 if (ret == -1 || event_fd == -1)
420 return MRAA_ERROR_UNSPECIFIED;
422 ret = read(event_fd, data, sizeof(struct iio_event_data));
429 mraa_iio_event_handler(void* arg)
431 struct iio_event_data data;
432 mraa_iio_context dev = (mraa_iio_context) arg;
435 if (mraa_iio_event_poll_nonblock(dev->fp_event, &data) == MRAA_SUCCESS) {
436 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
437 dev->isr_event(&data);
438 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
440 // we must have got an error code so die nicely
441 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
448 mraa_iio_event_setup_callback(mraa_iio_context dev, void (*fptr)(struct iio_event_data* data), void* args)
452 if (dev->thread_id != 0) {
453 return MRAA_ERROR_NO_RESOURCES;
456 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
457 dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
459 return MRAA_ERROR_INVALID_RESOURCE;
461 ret = ioctl(dev->fp, IIO_GET_EVENT_FD_IOCTL, &dev->fp_event);
464 if (ret == -1 || dev->fp_event == -1)
466 return MRAA_ERROR_UNSPECIFIED;
469 dev->isr_event = fptr;
470 pthread_create(&dev->thread_id, NULL, mraa_iio_event_handler, (void*) dev);
476 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)
478 *chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
479 *modifier= IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
480 *type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
481 *direction = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
482 *channel = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
483 *channel2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
484 *different = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
488 // does stop make any sense on iio devices?
490 mraa_iio_stop(mraa_iio_context dev)