staging:iio:Documentation generic_buffer.c update to new abi for buffers + misc fixes
Trivial space before newline fix incorporated. Additional fixes related to handling of sign extension and shifted data. Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> squash into buffer handling update. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron
Greg Kroah-Hartman
parent
d96d1337e3
commit
52615d4783
@ -27,6 +27,7 @@
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#include <sys/dir.h>
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#include <linux/types.h>
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#include <string.h>
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#include <poll.h>
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#include "iio_utils.h"
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/**
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@ -53,6 +54,24 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
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return bytes;
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}
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void print2byte(int input, struct iio_channel_info *info)
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{
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/* shift before conversion to avoid sign extension
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of left aligned data */
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input = input >> info->shift;
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if (info->is_signed) {
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int16_t val = input;
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val &= (1 << info->bits_used) - 1;
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val = (int16_t)(val << (16 - info->bits_used)) >>
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(16 - info->bits_used);
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printf("%05f ", val,
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(float)(val + info->offset)*info->scale);
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} else {
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uint16_t val = input;
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val &= (1 << info->bits_used) - 1;
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printf("%05f ", ((float)val + info->offset)*info->scale);
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}
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}
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/**
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* process_scan() - print out the values in SI units
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* @data: pointer to the start of the scan
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@ -70,25 +89,8 @@ void process_scan(char *data,
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switch (infoarray[k].bytes) {
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/* only a few cases implemented so far */
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case 2:
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if (infoarray[k].is_signed) {
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int16_t val = *(int16_t *)
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(data
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+ infoarray[k].location);
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if ((val >> infoarray[k].bits_used) & 1)
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val = (val & infoarray[k].mask) |
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~infoarray[k].mask;
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printf("%05f ", ((float)val +
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infoarray[k].offset)*
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infoarray[k].scale);
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} else {
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uint16_t val = *(uint16_t *)
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(data +
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infoarray[k].location);
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val = (val & infoarray[k].mask);
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printf("%05f ", ((float)val +
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infoarray[k].offset)*
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infoarray[k].scale);
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}
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print2byte(*(uint16_t *)(data + infoarray[k].location),
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&infoarray[k]);
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break;
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case 8:
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if (infoarray[k].is_signed) {
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@ -133,9 +135,8 @@ int main(int argc, char **argv)
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int datardytrigger = 1;
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char *data;
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ssize_t read_size;
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struct iio_event_data dat;
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int dev_num, trig_num;
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char *buffer_access, *buffer_event;
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char *buffer_access;
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int scan_size;
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int noevents = 0;
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char *dummy;
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@ -210,7 +211,7 @@ int main(int argc, char **argv)
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*/
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ret = build_channel_array(dev_dir_name, &infoarray, &num_channels);
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if (ret) {
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printf("Problem reading scan element information \n");
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printf("Problem reading scan element information\n");
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goto error_free_triggername;
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}
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@ -251,54 +252,32 @@ int main(int argc, char **argv)
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}
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ret = asprintf(&buffer_access,
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"/dev/device%d:buffer0:access0",
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"/dev/device%d:buffer0",
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dev_num);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_data;
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}
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ret = asprintf(&buffer_event, "/dev/device%d:buffer0:event0", dev_num);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_buffer_access;
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}
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/* Attempt to open non blocking the access dev */
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fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
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if (fp == -1) { /*If it isn't there make the node */
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printf("Failed to open %s\n", buffer_access);
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ret = -errno;
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goto error_free_buffer_event;
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}
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/* Attempt to open the event access dev (blocking this time) */
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fp_ev = fopen(buffer_event, "rb");
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if (fp_ev == NULL) {
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printf("Failed to open %s\n", buffer_event);
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ret = -errno;
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goto error_close_buffer_access;
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goto error_free_buffer_access;
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}
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/* Wait for events 10 times */
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for (j = 0; j < num_loops; j++) {
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if (!noevents) {
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read_size = fread(&dat,
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1,
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sizeof(struct iio_event_data),
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fp_ev);
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switch (dat.id) {
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case IIO_EVENT_CODE_RING_100_FULL:
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toread = buf_len;
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break;
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case IIO_EVENT_CODE_RING_75_FULL:
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toread = buf_len*3/4;
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break;
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case IIO_EVENT_CODE_RING_50_FULL:
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toread = buf_len/2;
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break;
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default:
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printf("Unexpecteded event code\n");
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continue;
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}
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struct pollfd pfd = {
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.fd = fp,
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.events = POLLIN,
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};
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poll(&pfd, 1, -1);
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toread = buf_len;
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} else {
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usleep(timedelay);
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toread = 64;
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@ -320,22 +299,18 @@ int main(int argc, char **argv)
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/* Stop the ring buffer */
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ret = write_sysfs_int("enable", buf_dir_name, 0);
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if (ret < 0)
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goto error_close_buffer_event;
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goto error_close_buffer_access;
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/* Disconnect from the trigger - just write a dummy name.*/
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write_sysfs_string("trigger/current_trigger",
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dev_dir_name, "NULL");
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error_close_buffer_event:
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fclose(fp_ev);
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error_close_buffer_access:
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close(fp);
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error_free_data:
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free(data);
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error_free_buffer_access:
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free(buffer_access);
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error_free_buffer_event:
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free(buffer_event);
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error_free_buf_dir_name:
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free(buf_dir_name);
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error_free_triggername:
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@ -16,25 +16,11 @@
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#define IIO_MAX_NAME_LENGTH 30
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#define IIO_EV_CLASS_BUFFER 0
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#define IIO_BUFFER_EVENT_CODE(code) \
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(IIO_EV_CLASS_BUFFER | (code << 8))
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#define IIO_EVENT_CODE_RING_50_FULL IIO_BUFFER_EVENT_CODE(0)
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#define IIO_EVENT_CODE_RING_75_FULL IIO_BUFFER_EVENT_CODE(1)
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#define IIO_EVENT_CODE_RING_100_FULL IIO_BUFFER_EVENT_CODE(2)
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#define FORMAT_SCAN_ELEMENTS_DIR "%s:buffer0/scan_elements"
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#define FORMAT_TYPE_FILE "%s_type"
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const char *iio_dir = "/sys/bus/iio/devices/";
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struct iio_event_data {
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int id;
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__s64 timestamp;
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};
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/**
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* iioutils_break_up_name() - extract generic name from full channel name
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* @full_name: the full channel name
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@ -85,6 +71,7 @@ struct iio_channel_info {
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unsigned index;
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unsigned bytes;
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unsigned bits_used;
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unsigned shift;
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uint64_t mask;
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unsigned is_signed;
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unsigned enabled;
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@ -103,6 +90,7 @@ struct iio_channel_info {
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inline int iioutils_get_type(unsigned *is_signed,
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unsigned *bytes,
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unsigned *bits_used,
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unsigned *shift,
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uint64_t *mask,
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const char *device_dir,
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const char *name,
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@ -157,7 +145,8 @@ inline int iioutils_get_type(unsigned *is_signed,
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goto error_free_filename;
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}
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fscanf(sysfsfp,
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"%c%u/%u", &signchar, bits_used, &padint);
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"%c%u/%u>>%u", &signchar, bits_used,
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&padint, shift);
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*bytes = padint / 8;
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if (*bits_used == 64)
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*mask = ~0;
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@ -395,6 +384,7 @@ inline int build_channel_array(const char *device_dir,
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ret = iioutils_get_type(¤t->is_signed,
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¤t->bytes,
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¤t->bits_used,
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¤t->shift,
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¤t->mask,
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device_dir,
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current->name,
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