diff options
Diffstat (limited to 'drivers/staging/iio/Documentation/generic_buffer.c')
| -rw-r--r-- | drivers/staging/iio/Documentation/generic_buffer.c | 81 |
1 files changed, 49 insertions, 32 deletions
diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c index 044ea196aa6f..de4647e2495e 100644 --- a/drivers/staging/iio/Documentation/generic_buffer.c +++ b/drivers/staging/iio/Documentation/generic_buffer.c @@ -47,6 +47,7 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels) { int bytes = 0; int i = 0; + while (i < num_channels) { if (bytes % channels[i].bytes == 0) channels[i].location = bytes; @@ -74,12 +75,14 @@ void print2byte(int input, struct iio_channel_info *info) input = input >> info->shift; if (info->is_signed) { int16_t val = input; + val &= (1 << info->bits_used) - 1; val = (int16_t)(val << (16 - info->bits_used)) >> (16 - info->bits_used); printf("%05f ", ((float)val + info->offset)*info->scale); } else { uint16_t val = input; + val &= (1 << info->bits_used) - 1; printf("%05f ", ((float)val + info->offset)*info->scale); } @@ -97,6 +100,7 @@ void process_scan(char *data, int num_channels) { int k; + for (k = 0; k < num_channels; k++) switch (channels[k].bytes) { /* only a few cases implemented so far */ @@ -158,11 +162,12 @@ int main(int argc, char **argv) char *buffer_access; int scan_size; int noevents = 0; + int notrigger = 0; char *dummy; struct iio_channel_info *channels; - while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) { + while ((c = getopt(argc, argv, "l:w:c:et:n:g")) != -1) { switch (c) { case 'n': device_name = optarg; @@ -183,6 +188,9 @@ int main(int argc, char **argv) case 'l': buf_len = strtoul(optarg, &dummy, 10); break; + case 'g': + notrigger = 1; + break; case '?': return -1; } @@ -201,28 +209,32 @@ int main(int argc, char **argv) printf("iio device number being used is %d\n", dev_num); asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); - if (trigger_name == NULL) { - /* - * Build the trigger name. If it is device associated its - * name is <device_name>_dev[n] where n matches the device - * number found above - */ - ret = asprintf(&trigger_name, - "%s-dev%d", device_name, dev_num); - if (ret < 0) { - ret = -ENOMEM; - goto error_ret; + + if (!notrigger) { + if (trigger_name == NULL) { + /* + * Build the trigger name. If it is device associated + * its name is <device_name>_dev[n] where n matches + * the device number found above. + */ + ret = asprintf(&trigger_name, + "%s-dev%d", device_name, dev_num); + if (ret < 0) { + ret = -ENOMEM; + goto error_ret; + } } - } - /* Verify the trigger exists */ - trig_num = find_type_by_name(trigger_name, "trigger"); - if (trig_num < 0) { - printf("Failed to find the trigger %s\n", trigger_name); - ret = -ENODEV; - goto error_free_triggername; - } - printf("iio trigger number being used is %d\n", trig_num); + /* Verify the trigger exists */ + trig_num = find_type_by_name(trigger_name, "trigger"); + if (trig_num < 0) { + printf("Failed to find the trigger %s\n", trigger_name); + ret = -ENODEV; + goto error_free_triggername; + } + printf("iio trigger number being used is %d\n", trig_num); + } else + printf("trigger-less mode selected\n"); /* * Parse the files in scan_elements to identify what channels are @@ -246,14 +258,18 @@ int main(int argc, char **argv) ret = -ENOMEM; goto error_free_triggername; } - 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) { - printf("Failed to write current_trigger file\n"); - goto error_free_buf_dir_name; + + 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) { + printf("Failed to write current_trigger file\n"); + goto error_free_buf_dir_name; + } } /* Setup ring buffer parameters */ @@ -323,9 +339,10 @@ int main(int argc, char **argv) if (ret < 0) goto error_close_buffer_access; - /* Disconnect the trigger - just write a dummy name. */ - write_sysfs_string("trigger/current_trigger", - dev_dir_name, "NULL"); + if (!notrigger) + /* Disconnect the trigger - just write a dummy name. */ + write_sysfs_string("trigger/current_trigger", + dev_dir_name, "NULL"); error_close_buffer_access: close(fp); |