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"
32 #define IIO_DEVICE "iio:device"
33 #define IIO_SCAN_ELEM "scan_elements"
34 #define IIO_SLASH_DEV "/dev/"IIO_DEVICE
35 #define IIO_SYSFS_DEVICE "/sys/bus/iio/devices/"IIO_DEVICE
36 #define IIO_EVENTS "events"
39 mraa_iio_init(int device)
41 if (device > plat_iio->iio_device_count) {
45 mraa_iio_get_channel_data(&plat_iio->iio_devices[device]);
46 mraa_iio_get_event_data(&plat_iio->iio_devices[device]);
48 return &plat_iio->iio_devices[device];
52 mraa_iio_read_size(mraa_iio_context dev)
58 mraa_iio_get_channels(mraa_iio_context dev)
64 mraa_iio_get_channel_count(mraa_iio_context dev)
70 mraa_iio_get_channel_data(mraa_iio_context dev)
72 const struct dirent *ent;
81 char shortbuf, signchar;
85 memset(buf, 0, MAX_SIZE);
86 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM, dev->num);
89 while ((ent = readdir(dir)) != NULL) {
90 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
95 dev->chan_num = chan_num;
96 //no need proceed if no channel found
99 mraa_iio_channel* chan;
100 dev->channels = calloc(chan_num, sizeof(mraa_iio_channel));
102 while ((ent = readdir(dir)) != NULL) {
103 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_index"), "_index") == 0) {
104 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM "/%s", dev->num, ent->d_name);
105 fd = open(buf, O_RDONLY);
107 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
110 chan_num = ((int) strtol(readbuf, NULL, 10));
111 chan = &dev->channels[chan_num];
112 chan->index = chan_num;
115 buf[(strlen(buf)-5)] = '\0';
116 char* str = strdup(buf);
117 // grab the type of the buffer
118 snprintf(buf, MAX_SIZE, "%stype", str);
119 fd = open(buf, O_RDONLY);
121 read(fd, readbuf, 31 * sizeof(char));
122 ret = sscanf(readbuf, "%ce:%c%u/%u>>%u", &shortbuf,
123 &signchar, &chan->bits_used,
124 &padint, &chan->shift);
125 chan->bytes = padint / 8;
126 if (curr_bytes % chan->bytes == 0) {
127 chan->location = curr_bytes;
129 chan->location = curr_bytes - curr_bytes%chan->bytes + chan->bytes;
131 curr_bytes = chan->location + chan->bytes;
132 // probably should be 5?
137 return MRAA_IO_SETUP_FAILURE;
139 chan->signedd = (signchar == 's');
140 chan->lendian = (shortbuf == 'l');
141 if (chan->bits_used == 64) {
144 chan->mask = (1 << chan->bits_used) - 1;
148 // grab the enable flag of channel
149 snprintf(buf, MAX_SIZE, "%sen", str);
150 fd = open(buf, O_RDONLY);
152 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
153 syslog(LOG_ERR, "iio: Failed to read a sensible value from sysfs");
156 chan->enabled = (int) strtol(readbuf, NULL, 10);
157 //only calculate enable buffer size for trigger buffer extract data
159 dev->datasize += chan->bytes;
173 mraa_iio_get_device_name(mraa_iio_context dev)
179 mraa_iio_get_device_num_by_name(const char* name)
183 if (plat_iio == NULL) {
184 syslog(LOG_ERR, "iio: platform IIO structure is not initialized");
189 syslog(LOG_ERR, "iio: device name is NULL, unable to find its number");
193 for (i = 0; i < plat_iio->iio_device_count; i++) {
195 device = &plat_iio->iio_devices[i];
196 // we want to check for exact match
197 if (strncmp(device->name, name, strlen(device->name)+1) == 0) {
206 mraa_iio_read(mraa_iio_context dev, const char* attr_chan, float* data)
209 snprintf(buf, 64, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
210 int fd = open(buf, O_RDONLY);
212 int len = read(fd, &buf, 64);
213 *data = strtol(buf, NULL, 10);
216 return MRAA_ERROR_UNSPECIFIED;
220 mraa_iio_write(mraa_iio_context dev, const char* attr_chan, const char* data)
223 snprintf(buf, 128, IIO_SYSFS_DEVICE "%d/%s", dev->num, attr_chan);
224 int fd = open(buf, O_WRONLY);
226 write(fd, data, (strlen(data)+1));
229 return MRAA_ERROR_UNSPECIFIED;
233 mraa_iio_wait_event(int fd, char* data, int *read_size)
238 return MRAA_ERROR_INVALID_RESOURCE;
244 // Wait for it forever or until pthread_cancel
245 // poll is a cancelable point like sleep()
246 int x = poll(&pfd, 1, -1);
248 memset(data, 0, 100);
249 *read_size = read(fd, data, 100);
255 mraa_iio_trigger_handler(void* arg)
257 mraa_iio_context dev = (mraa_iio_context) arg;
259 char data[MAX_SIZE*100];
263 if (mraa_iio_wait_event(dev->fp, &data[0], &read_size) == MRAA_SUCCESS) {
264 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
265 //only can process if readsize >= enabled channel's datasize
266 for (i=0; i<(read_size/dev->datasize); i++) {
269 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
271 // we must have got an error code so die nicely
272 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
279 mraa_iio_trigger_buffer(mraa_iio_context dev, void (*fptr)(char* data), void* args)
282 if (dev->thread_id != 0) {
283 return MRAA_ERROR_NO_RESOURCES;
286 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
287 dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
289 return MRAA_ERROR_INVALID_RESOURCE;
293 pthread_create(&dev->thread_id, NULL, mraa_iio_trigger_handler, (void*) dev);
299 mraa_iio_get_event_data(mraa_iio_context dev)
301 const struct dirent *ent;
310 char shortbuf, signchar;
311 memset(buf, 0, MAX_SIZE);
312 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS, dev->num);
315 while ((ent = readdir(dir)) != NULL) {
316 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
320 dev->event_num = event_num;
321 //no need proceed if no event found
324 mraa_iio_event* event;
325 dev->events = calloc(event_num, sizeof(mraa_iio_event));
326 if ( dev->events == NULL)
329 return MRAA_ERROR_UNSPECIFIED;
333 while ((ent = readdir(dir)) != NULL)
335 if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"), "_en") == 0) {
336 event = &dev->events[event_num];
337 event->name = strdup(ent->d_name);
338 snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, ent->d_name);
339 fd = open(buf, O_RDONLY);
341 if (read(fd, readbuf, 2 * sizeof(char)) != 2) {
346 event->enabled = ((int) strtol(readbuf, NULL, 10));
347 //Todo, read other event info.
357 mraa_iio_event_read(mraa_iio_context dev, const char* attribute, float* data)
360 snprintf(buf, 64, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
361 int fd = open(buf, O_RDONLY);
363 int len = read(fd, &buf, 64);
364 *data = strtol(buf, NULL, 10);
367 return MRAA_ERROR_UNSPECIFIED;
371 mraa_iio_event_write(mraa_iio_context dev, const char* attribute, const char* data)
375 snprintf(buf, 128, IIO_SYSFS_DEVICE "%d/" IIO_EVENTS "/%s", dev->num, attribute);
376 int fd = open(buf, O_WRONLY);
378 int len = write(fd, data, ( strlen(data) +1 ));
381 return MRAA_ERROR_UNSPECIFIED;
385 mraa_iio_event_poll_nonblock(int fd, struct iio_event_data* data)
390 return MRAA_ERROR_INVALID_RESOURCE;
396 // Wait for it forever or until pthread_cancel
397 // poll is a cancelable point like sleep()
398 int x = poll(&pfd, 1, -1);
400 read(fd, data, sizeof(struct iio_event_data));
406 mraa_iio_event_poll(mraa_iio_context dev, struct iio_event_data* data)
413 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
415 ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
418 if (ret == -1 || event_fd == -1)
419 return MRAA_ERROR_UNSPECIFIED;
421 ret = read(event_fd, data, sizeof(struct iio_event_data));
428 mraa_iio_event_handler(void* arg)
430 struct iio_event_data data;
431 mraa_iio_context dev = (mraa_iio_context) arg;
434 if (mraa_iio_event_poll_nonblock(dev->fp_event, &data) == MRAA_SUCCESS) {
435 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
436 dev->isr_event(&data);
437 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
439 // we must have got an error code so die nicely
440 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
447 mraa_iio_event_setup_callback(mraa_iio_context dev, void (*fptr)(struct iio_event_data* data), void* args)
451 if (dev->thread_id != 0) {
452 return MRAA_ERROR_NO_RESOURCES;
455 sprintf(bu, IIO_SLASH_DEV "%d", dev->num);
456 dev->fp = open(bu, O_RDONLY | O_NONBLOCK);
458 return MRAA_ERROR_INVALID_RESOURCE;
460 ret = ioctl(dev->fp, IIO_GET_EVENT_FD_IOCTL, &dev->fp_event);
463 if (ret == -1 || dev->fp_event == -1)
465 return MRAA_ERROR_UNSPECIFIED;
468 dev->isr_event = fptr;
469 pthread_create(&dev->thread_id, NULL, mraa_iio_event_handler, (void*) dev);
475 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)
477 *chan_type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
478 *modifier= IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
479 *type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
480 *direction = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
481 *channel = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
482 *channel2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
483 *different = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
487 // does stop make any sense on iio devices?
489 mraa_iio_stop(mraa_iio_context dev)