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758 lines
18 KiB
758 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Industrialio buffer test code. |
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* |
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* Copyright (c) 2008 Jonathan Cameron |
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* |
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* This program is primarily intended as an example application. |
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* Reads the current buffer setup from sysfs and starts a short capture |
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* from the specified device, pretty printing the result after appropriate |
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* conversion. |
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* |
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* Command line parameters |
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* generic_buffer -n <device_name> -t <trigger_name> |
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* If trigger name is not specified the program assumes you want a dataready |
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* trigger associated with the device and goes looking for it. |
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*/ |
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|
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <dirent.h> |
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#include <fcntl.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include <sys/stat.h> |
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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 <endian.h> |
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#include <getopt.h> |
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#include <inttypes.h> |
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#include <stdbool.h> |
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#include <signal.h> |
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#include <sys/ioctl.h> |
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#include <linux/iio/buffer.h> |
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#include "iio_utils.h" |
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|
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/** |
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* enum autochan - state for the automatic channel enabling mechanism |
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*/ |
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enum autochan { |
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AUTOCHANNELS_DISABLED, |
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AUTOCHANNELS_ENABLED, |
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AUTOCHANNELS_ACTIVE, |
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}; |
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/** |
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* size_from_channelarray() - calculate the storage size of a scan |
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* @channels: the channel info array |
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* @num_channels: number of channels |
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* |
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* Has the side effect of filling the channels[i].location values used |
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* in processing the buffer output. |
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**/ |
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static int size_from_channelarray(struct iio_channel_info *channels, int num_channels) |
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{ |
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int bytes = 0; |
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int i = 0; |
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|
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while (i < num_channels) { |
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if (bytes % channels[i].bytes == 0) |
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channels[i].location = bytes; |
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else |
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channels[i].location = bytes - bytes % channels[i].bytes |
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+ channels[i].bytes; |
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bytes = channels[i].location + channels[i].bytes; |
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i++; |
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} |
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return bytes; |
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} |
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static void print1byte(uint8_t input, struct iio_channel_info *info) |
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{ |
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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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*/ |
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input >>= info->shift; |
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input &= info->mask; |
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if (info->is_signed) { |
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int8_t val = (int8_t)(input << (8 - info->bits_used)) >> |
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(8 - info->bits_used); |
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printf("%05f ", ((float)val + info->offset) * info->scale); |
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} else { |
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printf("%05f ", ((float)input + info->offset) * info->scale); |
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} |
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} |
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static void print2byte(uint16_t input, struct iio_channel_info *info) |
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{ |
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/* First swap if incorrect endian */ |
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if (info->be) |
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input = be16toh(input); |
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else |
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input = le16toh(input); |
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|
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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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*/ |
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input >>= info->shift; |
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input &= info->mask; |
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if (info->is_signed) { |
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int16_t val = (int16_t)(input << (16 - info->bits_used)) >> |
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(16 - info->bits_used); |
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printf("%05f ", ((float)val + info->offset) * info->scale); |
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} else { |
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printf("%05f ", ((float)input + info->offset) * info->scale); |
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} |
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} |
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static void print4byte(uint32_t input, struct iio_channel_info *info) |
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{ |
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/* First swap if incorrect endian */ |
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if (info->be) |
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input = be32toh(input); |
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else |
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input = le32toh(input); |
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|
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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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*/ |
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input >>= info->shift; |
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input &= info->mask; |
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if (info->is_signed) { |
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int32_t val = (int32_t)(input << (32 - info->bits_used)) >> |
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(32 - info->bits_used); |
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printf("%05f ", ((float)val + info->offset) * info->scale); |
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} else { |
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printf("%05f ", ((float)input + info->offset) * info->scale); |
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} |
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} |
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static void print8byte(uint64_t input, struct iio_channel_info *info) |
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{ |
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/* First swap if incorrect endian */ |
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if (info->be) |
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input = be64toh(input); |
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else |
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input = le64toh(input); |
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|
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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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*/ |
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input >>= info->shift; |
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input &= info->mask; |
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if (info->is_signed) { |
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int64_t val = (int64_t)(input << (64 - info->bits_used)) >> |
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(64 - info->bits_used); |
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/* special case for timestamp */ |
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if (info->scale == 1.0f && info->offset == 0.0f) |
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printf("%" PRId64 " ", val); |
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else |
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printf("%05f ", |
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((float)val + info->offset) * info->scale); |
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} else { |
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printf("%05f ", ((float)input + 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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* @channels: information about the channels. |
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* Note: size_from_channelarray must have been called first |
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* to fill the location offsets. |
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* @num_channels: number of channels |
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**/ |
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static void process_scan(char *data, struct iio_channel_info *channels, |
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int num_channels) |
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{ |
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int k; |
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for (k = 0; k < num_channels; k++) |
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switch (channels[k].bytes) { |
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/* only a few cases implemented so far */ |
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case 1: |
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print1byte(*(uint8_t *)(data + channels[k].location), |
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&channels[k]); |
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break; |
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case 2: |
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print2byte(*(uint16_t *)(data + channels[k].location), |
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&channels[k]); |
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break; |
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case 4: |
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print4byte(*(uint32_t *)(data + channels[k].location), |
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&channels[k]); |
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break; |
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case 8: |
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print8byte(*(uint64_t *)(data + channels[k].location), |
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&channels[k]); |
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break; |
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default: |
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break; |
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} |
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printf("\n"); |
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} |
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static int enable_disable_all_channels(char *dev_dir_name, int buffer_idx, int enable) |
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{ |
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const struct dirent *ent; |
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char scanelemdir[256]; |
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DIR *dp; |
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int ret; |
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snprintf(scanelemdir, sizeof(scanelemdir), |
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FORMAT_SCAN_ELEMENTS_DIR, dev_dir_name, buffer_idx); |
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scanelemdir[sizeof(scanelemdir)-1] = '\0'; |
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dp = opendir(scanelemdir); |
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if (!dp) { |
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fprintf(stderr, "Enabling/disabling channels: can't open %s\n", |
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scanelemdir); |
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return -EIO; |
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} |
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ret = -ENOENT; |
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while (ent = readdir(dp), ent) { |
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if (iioutils_check_suffix(ent->d_name, "_en")) { |
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printf("%sabling: %s\n", |
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enable ? "En" : "Dis", |
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ent->d_name); |
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ret = write_sysfs_int(ent->d_name, scanelemdir, |
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enable); |
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if (ret < 0) |
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fprintf(stderr, "Failed to enable/disable %s\n", |
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ent->d_name); |
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} |
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} |
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if (closedir(dp) == -1) { |
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perror("Enabling/disabling channels: " |
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"Failed to close directory"); |
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return -errno; |
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} |
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return 0; |
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} |
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static void print_usage(void) |
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{ |
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fprintf(stderr, "Usage: generic_buffer [options]...\n" |
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"Capture, convert and output data from IIO device buffer\n" |
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" -a Auto-activate all available channels\n" |
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" -A Force-activate ALL channels\n" |
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" -b <n> The buffer which to open (by index), default 0\n" |
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" -c <n> Do n conversions, or loop forever if n < 0\n" |
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" -e Disable wait for event (new data)\n" |
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" -g Use trigger-less mode\n" |
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" -l <n> Set buffer length to n samples\n" |
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" --device-name -n <name>\n" |
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" --device-num -N <num>\n" |
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" Set device by name or number (mandatory)\n" |
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" --trigger-name -t <name>\n" |
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" --trigger-num -T <num>\n" |
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" Set trigger by name or number\n" |
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" -w <n> Set delay between reads in us (event-less mode)\n"); |
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} |
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static enum autochan autochannels = AUTOCHANNELS_DISABLED; |
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static char *dev_dir_name = NULL; |
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static char *buf_dir_name = NULL; |
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static int buffer_idx = 0; |
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static bool current_trigger_set = false; |
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static void cleanup(void) |
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{ |
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int ret; |
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/* Disable trigger */ |
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if (dev_dir_name && current_trigger_set) { |
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/* Disconnect the trigger - just write a dummy name. */ |
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ret = write_sysfs_string("trigger/current_trigger", |
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dev_dir_name, "NULL"); |
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if (ret < 0) |
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fprintf(stderr, "Failed to disable trigger: %s\n", |
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strerror(-ret)); |
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current_trigger_set = false; |
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} |
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/* Disable buffer */ |
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if (buf_dir_name) { |
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ret = write_sysfs_int("enable", buf_dir_name, 0); |
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if (ret < 0) |
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fprintf(stderr, "Failed to disable buffer: %s\n", |
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strerror(-ret)); |
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} |
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/* Disable channels if auto-enabled */ |
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if (dev_dir_name && autochannels == AUTOCHANNELS_ACTIVE) { |
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ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 0); |
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if (ret) |
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fprintf(stderr, "Failed to disable all channels\n"); |
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autochannels = AUTOCHANNELS_DISABLED; |
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} |
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} |
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static void sig_handler(int signum) |
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{ |
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fprintf(stderr, "Caught signal %d\n", signum); |
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cleanup(); |
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exit(-signum); |
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} |
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static void register_cleanup(void) |
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{ |
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struct sigaction sa = { .sa_handler = sig_handler }; |
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const int signums[] = { SIGINT, SIGTERM, SIGABRT }; |
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int ret, i; |
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for (i = 0; i < ARRAY_SIZE(signums); ++i) { |
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ret = sigaction(signums[i], &sa, NULL); |
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if (ret) { |
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perror("Failed to register signal handler"); |
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exit(-1); |
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} |
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} |
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} |
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static const struct option longopts[] = { |
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{ "device-name", 1, 0, 'n' }, |
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{ "device-num", 1, 0, 'N' }, |
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{ "trigger-name", 1, 0, 't' }, |
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{ "trigger-num", 1, 0, 'T' }, |
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{ }, |
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}; |
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int main(int argc, char **argv) |
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{ |
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long long num_loops = 2; |
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unsigned long timedelay = 1000000; |
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unsigned long buf_len = 128; |
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ssize_t i; |
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unsigned long long j; |
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unsigned long toread; |
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int ret, c; |
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struct stat st; |
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int fd = -1; |
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int buf_fd = -1; |
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int num_channels = 0; |
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char *trigger_name = NULL, *device_name = NULL; |
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char *data = NULL; |
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ssize_t read_size; |
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int dev_num = -1, trig_num = -1; |
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char *buffer_access = NULL; |
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int scan_size; |
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int noevents = 0; |
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int notrigger = 0; |
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char *dummy; |
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bool force_autochannels = false; |
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struct iio_channel_info *channels = NULL; |
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register_cleanup(); |
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while ((c = getopt_long(argc, argv, "aAb:c:egl:n:N:t:T:w:?", longopts, |
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NULL)) != -1) { |
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switch (c) { |
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case 'a': |
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autochannels = AUTOCHANNELS_ENABLED; |
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break; |
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case 'A': |
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autochannels = AUTOCHANNELS_ENABLED; |
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force_autochannels = true; |
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break; |
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case 'b': |
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errno = 0; |
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buffer_idx = strtoll(optarg, &dummy, 10); |
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if (errno) { |
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ret = -errno; |
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goto error; |
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} |
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if (buffer_idx < 0) { |
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ret = -ERANGE; |
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goto error; |
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} |
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break; |
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case 'c': |
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errno = 0; |
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num_loops = strtoll(optarg, &dummy, 10); |
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if (errno) { |
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ret = -errno; |
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goto error; |
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} |
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break; |
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case 'e': |
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noevents = 1; |
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break; |
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case 'g': |
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notrigger = 1; |
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break; |
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case 'l': |
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errno = 0; |
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buf_len = strtoul(optarg, &dummy, 10); |
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if (errno) { |
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ret = -errno; |
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goto error; |
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} |
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break; |
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case 'n': |
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device_name = strdup(optarg); |
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break; |
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case 'N': |
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errno = 0; |
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dev_num = strtoul(optarg, &dummy, 10); |
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if (errno) { |
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ret = -errno; |
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goto error; |
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} |
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break; |
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case 't': |
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trigger_name = strdup(optarg); |
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break; |
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case 'T': |
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errno = 0; |
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trig_num = strtoul(optarg, &dummy, 10); |
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if (errno) |
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return -errno; |
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break; |
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case 'w': |
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errno = 0; |
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timedelay = strtoul(optarg, &dummy, 10); |
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if (errno) { |
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ret = -errno; |
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goto error; |
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} |
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break; |
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case '?': |
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print_usage(); |
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ret = -1; |
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goto error; |
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} |
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} |
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/* Find the device requested */ |
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if (dev_num < 0 && !device_name) { |
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fprintf(stderr, "Device not set\n"); |
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print_usage(); |
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ret = -1; |
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goto error; |
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} else if (dev_num >= 0 && device_name) { |
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fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n"); |
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print_usage(); |
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ret = -1; |
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goto error; |
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} else if (dev_num < 0) { |
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dev_num = find_type_by_name(device_name, "iio:device"); |
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if (dev_num < 0) { |
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fprintf(stderr, "Failed to find the %s\n", device_name); |
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ret = dev_num; |
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goto error; |
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} |
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} |
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printf("iio device number being used is %d\n", dev_num); |
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ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); |
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if (ret < 0) |
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return -ENOMEM; |
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/* Fetch device_name if specified by number */ |
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if (!device_name) { |
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device_name = malloc(IIO_MAX_NAME_LENGTH); |
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if (!device_name) { |
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ret = -ENOMEM; |
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goto error; |
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} |
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ret = read_sysfs_string("name", dev_dir_name, device_name); |
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if (ret < 0) { |
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fprintf(stderr, "Failed to read name of device %d\n", dev_num); |
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goto error; |
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} |
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} |
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if (notrigger) { |
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printf("trigger-less mode selected\n"); |
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} else if (trig_num >= 0) { |
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char *trig_dev_name; |
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ret = asprintf(&trig_dev_name, "%strigger%d", iio_dir, trig_num); |
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if (ret < 0) { |
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return -ENOMEM; |
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} |
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trigger_name = malloc(IIO_MAX_NAME_LENGTH); |
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ret = read_sysfs_string("name", trig_dev_name, trigger_name); |
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free(trig_dev_name); |
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if (ret < 0) { |
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fprintf(stderr, "Failed to read trigger%d name from\n", trig_num); |
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return ret; |
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} |
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printf("iio trigger number being used is %d\n", trig_num); |
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} else { |
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if (!trigger_name) { |
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/* |
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* Build the trigger name. If it is device associated |
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* its name is <device_name>_dev[n] where n matches |
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* the device number found above. |
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*/ |
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ret = asprintf(&trigger_name, |
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"%s-dev%d", device_name, dev_num); |
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if (ret < 0) { |
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ret = -ENOMEM; |
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goto error; |
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} |
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} |
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|
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/* Look for this "-devN" trigger */ |
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trig_num = find_type_by_name(trigger_name, "trigger"); |
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if (trig_num < 0) { |
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/* OK try the simpler "-trigger" suffix instead */ |
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free(trigger_name); |
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ret = asprintf(&trigger_name, |
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"%s-trigger", device_name); |
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if (ret < 0) { |
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ret = -ENOMEM; |
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goto error; |
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} |
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} |
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trig_num = find_type_by_name(trigger_name, "trigger"); |
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if (trig_num < 0) { |
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fprintf(stderr, "Failed to find the trigger %s\n", |
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trigger_name); |
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ret = trig_num; |
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goto error; |
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} |
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|
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printf("iio trigger number being used is %d\n", trig_num); |
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} |
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|
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/* |
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* Parse the files in scan_elements to identify what channels are |
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* present |
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*/ |
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ret = build_channel_array(dev_dir_name, buffer_idx, &channels, &num_channels); |
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if (ret) { |
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fprintf(stderr, "Problem reading scan element information\n" |
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"diag %s\n", dev_dir_name); |
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goto error; |
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} |
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if (num_channels && autochannels == AUTOCHANNELS_ENABLED && |
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!force_autochannels) { |
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fprintf(stderr, "Auto-channels selected but some channels " |
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"are already activated in sysfs\n"); |
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fprintf(stderr, "Proceeding without activating any channels\n"); |
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} |
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|
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if ((!num_channels && autochannels == AUTOCHANNELS_ENABLED) || |
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(autochannels == AUTOCHANNELS_ENABLED && force_autochannels)) { |
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fprintf(stderr, "Enabling all channels\n"); |
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|
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ret = enable_disable_all_channels(dev_dir_name, buffer_idx, 1); |
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if (ret) { |
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fprintf(stderr, "Failed to enable all channels\n"); |
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goto error; |
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} |
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|
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/* This flags that we need to disable the channels again */ |
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autochannels = AUTOCHANNELS_ACTIVE; |
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|
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ret = build_channel_array(dev_dir_name, buffer_idx, &channels, |
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&num_channels); |
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if (ret) { |
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fprintf(stderr, "Problem reading scan element " |
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"information\n" |
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"diag %s\n", dev_dir_name); |
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goto error; |
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} |
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if (!num_channels) { |
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fprintf(stderr, "Still no channels after " |
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"auto-enabling, giving up\n"); |
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goto error; |
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} |
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} |
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|
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if (!num_channels && autochannels == AUTOCHANNELS_DISABLED) { |
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fprintf(stderr, |
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"No channels are enabled, we have nothing to scan.\n"); |
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fprintf(stderr, "Enable channels manually in " |
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FORMAT_SCAN_ELEMENTS_DIR |
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"/*_en or pass -a to autoenable channels and " |
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"try again.\n", dev_dir_name, buffer_idx); |
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ret = -ENOENT; |
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goto error; |
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} |
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|
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/* |
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* Construct the directory name for the associated buffer. |
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* As we know that the lis3l02dq has only one buffer this may |
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* be built rather than found. |
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*/ |
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ret = asprintf(&buf_dir_name, |
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"%siio:device%d/buffer%d", iio_dir, dev_num, buffer_idx); |
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if (ret < 0) { |
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ret = -ENOMEM; |
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goto error; |
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} |
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|
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if (stat(buf_dir_name, &st)) { |
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fprintf(stderr, "Could not stat() '%s', got error %d: %s\n", |
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buf_dir_name, errno, strerror(errno)); |
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ret = -errno; |
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goto error; |
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} |
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|
|
if (!S_ISDIR(st.st_mode)) { |
|
fprintf(stderr, "File '%s' is not a directory\n", buf_dir_name); |
|
ret = -EFAULT; |
|
goto error; |
|
} |
|
|
|
if (!notrigger) { |
|
printf("%s %s\n", dev_dir_name, trigger_name); |
|
/* |
|
* Set the device trigger to be the data ready trigger found |
|
* above |
|
*/ |
|
ret = write_sysfs_string_and_verify("trigger/current_trigger", |
|
dev_dir_name, |
|
trigger_name); |
|
if (ret < 0) { |
|
fprintf(stderr, |
|
"Failed to write current_trigger file\n"); |
|
goto error; |
|
} |
|
} |
|
|
|
ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num); |
|
if (ret < 0) { |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
/* Attempt to open non blocking the access dev */ |
|
fd = open(buffer_access, O_RDONLY | O_NONBLOCK); |
|
if (fd == -1) { /* TODO: If it isn't there make the node */ |
|
ret = -errno; |
|
fprintf(stderr, "Failed to open %s\n", buffer_access); |
|
goto error; |
|
} |
|
|
|
/* specify for which buffer index we want an FD */ |
|
buf_fd = buffer_idx; |
|
|
|
ret = ioctl(fd, IIO_BUFFER_GET_FD_IOCTL, &buf_fd); |
|
if (ret == -1 || buf_fd == -1) { |
|
ret = -errno; |
|
if (ret == -ENODEV || ret == -EINVAL) |
|
fprintf(stderr, |
|
"Device does not have this many buffers\n"); |
|
else |
|
fprintf(stderr, "Failed to retrieve buffer fd\n"); |
|
|
|
goto error; |
|
} |
|
|
|
/* Setup ring buffer parameters */ |
|
ret = write_sysfs_int("length", buf_dir_name, buf_len); |
|
if (ret < 0) |
|
goto error; |
|
|
|
/* Enable the buffer */ |
|
ret = write_sysfs_int("enable", buf_dir_name, 1); |
|
if (ret < 0) { |
|
fprintf(stderr, |
|
"Failed to enable buffer '%s': %s\n", |
|
buf_dir_name, strerror(-ret)); |
|
goto error; |
|
} |
|
|
|
scan_size = size_from_channelarray(channels, num_channels); |
|
data = malloc(scan_size * buf_len); |
|
if (!data) { |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
/** |
|
* This check is being done here for sanity reasons, however it |
|
* should be omitted under normal operation. |
|
* If this is buffer0, we check that we get EBUSY after this point. |
|
*/ |
|
if (buffer_idx == 0) { |
|
errno = 0; |
|
read_size = read(fd, data, 1); |
|
if (read_size > -1 || errno != EBUSY) { |
|
ret = -EFAULT; |
|
perror("Reading from '%s' should not be possible after ioctl()"); |
|
goto error; |
|
} |
|
} |
|
|
|
/* close now the main chardev FD and let the buffer FD work */ |
|
if (close(fd) == -1) |
|
perror("Failed to close character device file"); |
|
fd = -1; |
|
|
|
for (j = 0; j < num_loops || num_loops < 0; j++) { |
|
if (!noevents) { |
|
struct pollfd pfd = { |
|
.fd = buf_fd, |
|
.events = POLLIN, |
|
}; |
|
|
|
ret = poll(&pfd, 1, -1); |
|
if (ret < 0) { |
|
ret = -errno; |
|
goto error; |
|
} else if (ret == 0) { |
|
continue; |
|
} |
|
|
|
toread = buf_len; |
|
} else { |
|
usleep(timedelay); |
|
toread = 64; |
|
} |
|
|
|
read_size = read(buf_fd, data, toread * scan_size); |
|
if (read_size < 0) { |
|
if (errno == EAGAIN) { |
|
fprintf(stderr, "nothing available\n"); |
|
continue; |
|
} else { |
|
break; |
|
} |
|
} |
|
for (i = 0; i < read_size / scan_size; i++) |
|
process_scan(data + scan_size * i, channels, |
|
num_channels); |
|
} |
|
|
|
error: |
|
cleanup(); |
|
|
|
if (fd >= 0 && close(fd) == -1) |
|
perror("Failed to close character device"); |
|
if (buf_fd >= 0 && close(buf_fd) == -1) |
|
perror("Failed to close buffer"); |
|
free(buffer_access); |
|
free(data); |
|
free(buf_dir_name); |
|
for (i = num_channels - 1; i >= 0; i--) { |
|
free(channels[i].name); |
|
free(channels[i].generic_name); |
|
} |
|
free(channels); |
|
free(trigger_name); |
|
free(device_name); |
|
free(dev_dir_name); |
|
|
|
return ret; |
|
}
|
|
|