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SubjectRe: [PATCHv3 2/7] iio: generic_buffer: Add --device-num option
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On 23/05/16 19:39, Crestez Dan Leonard wrote:
> This makes it possible to distinguish between iio devices with the same
> name.
>
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Applied.
> ---
> tools/iio/generic_buffer.c | 69 ++++++++++++++++++++++++++++++++++------------
> 1 file changed, 51 insertions(+), 18 deletions(-)
>
> diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
> index 972f400..3f16e9f 100644
> --- a/tools/iio/generic_buffer.c
> +++ b/tools/iio/generic_buffer.c
> @@ -251,7 +251,9 @@ void print_usage(void)
> " -e Disable wait for event (new data)\n"
> " -g Use trigger-less mode\n"
> " -l <n> Set buffer length to n samples\n"
> - " -n <name> Set device name (mandatory)\n"
> + " --device-name -n <name>\n"
> + " --device-num -N <num>\n"
> + " Set device by name or number (mandatory)\n"
> " -t <name> Set trigger name\n"
> " -w <n> Set delay between reads in us (event-less mode)\n");
> }
> @@ -315,6 +317,12 @@ void register_cleanup(void)
> }
> }
>
> +static const struct option longopts[] = {
> + { "device-name", 1, 0, 'n' },
> + { "device-num", 1, 0, 'N' },
> + { },
> +};
> +
> int main(int argc, char **argv)
> {
> unsigned long num_loops = 2;
> @@ -329,7 +337,7 @@ int main(int argc, char **argv)
>
> char *data = NULL;
> ssize_t read_size;
> - int dev_num, trig_num;
> + int dev_num = -1, trig_num;
> char *buffer_access = NULL;
> int scan_size;
> int noevents = 0;
> @@ -340,7 +348,7 @@ int main(int argc, char **argv)
>
> register_cleanup();
>
> - while ((c = getopt(argc, argv, "ac:egl:n:t:w:")) != -1) {
> + while ((c = getopt_long(argc, argv, "ac:egl:n:N:t:w:", longopts, NULL)) != -1) {
> switch (c) {
> case 'a':
> autochannels = AUTOCHANNELS_ENABLED;
> @@ -370,7 +378,15 @@ int main(int argc, char **argv)
>
> break;
> case 'n':
> - device_name = optarg;
> + device_name = strdup(optarg);
> + break;
> + case 'N':
> + errno = 0;
> + dev_num = strtoul(optarg, &dummy, 10);
> + if (errno) {
> + ret = -errno;
> + goto error;
> + }
> break;
> case 't':
> trigger_name = strdup(optarg);
> @@ -390,26 +406,42 @@ int main(int argc, char **argv)
> }
> }
>
> - if (!device_name) {
> - fprintf(stderr, "Device name not set\n");
> - print_usage();
> - return -1;
> - }
> -
> /* Find the device requested */
> - dev_num = find_type_by_name(device_name, "iio:device");
> - if (dev_num < 0) {
> - fprintf(stderr, "Failed to find the %s\n", device_name);
> - ret = dev_num;
> + if (dev_num < 0 && !device_name) {
> + fprintf(stderr, "Device not set\n");
> + print_usage();
> + ret = -1;
> + goto error;
> + } else if (dev_num >= 0 && device_name) {
> + fprintf(stderr, "Only one of --device-num or --device-name needs to be set\n");
> + print_usage();
> + ret = -1;
> goto error;
> + } else if (dev_num < 0) {
> + dev_num = find_type_by_name(device_name, "iio:device");
> + if (dev_num < 0) {
> + fprintf(stderr, "Failed to find the %s\n", device_name);
> + ret = dev_num;
> + goto error;
> + }
> }
> -
> printf("iio device number being used is %d\n", dev_num);
>
> ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
> - if (ret < 0) {
> - ret = -ENOMEM;
> - goto error;
> + if (ret < 0)
> + return -ENOMEM;
> + /* Fetch device_name if specified by number */
> + if (!device_name) {
> + device_name = malloc(IIO_MAX_NAME_LENGTH);
> + if (!device_name) {
> + ret = -ENOMEM;
> + goto error;
> + }
> + ret = read_sysfs_string("name", dev_dir_name, device_name);
> + if (ret < 0) {
> + fprintf(stderr, "Failed to read name of device %d\n", dev_num);
> + goto error;
> + }
> }
>
> if (!notrigger) {
> @@ -619,6 +651,7 @@ error:
> }
> free(channels);
> free(trigger_name);
> + free(device_name);
> free(dev_dir_name);
>
> return ret;
>

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