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introduce api function to read usb string descriptors

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This API allows to read manufacturer and product names as well as the
serial number advertized by the device on the bus.
This commit is contained in:
Dimitri Stolnikov
2012-05-20 16:41:15 +02:00
parent fdc7bc978b
commit 505f40d9a0
3 changed files with 123 additions and 4 deletions
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87
src/librtlsdr.c
View File

@ -571,6 +571,47 @@ int rtlsdr_get_xtal_freq(rtlsdr_dev_t *dev, uint32_t *rtl_freq, uint32_t *tuner_
return 0;
}
int rtlsdr_get_usb_strings(rtlsdr_dev_t *dev, char *manufact, char *product,
char *serial)
{
struct libusb_device_descriptor dd;
libusb_device *device = NULL;
const int buf_max = 256;
int r = 0;
if (!dev || !dev->devh)
return -1;
device = libusb_get_device(dev->devh);
r = libusb_get_device_descriptor(device, &dd);
if (r < 0)
return -1;
if (manufact) {
memset(manufact, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iManufacturer,
(unsigned char *)manufact,
buf_max);
}
if (product) {
memset(product, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iProduct,
(unsigned char *)product,
buf_max);
}
if (serial) {
memset(serial, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iSerialNumber,
(unsigned char *)serial,
buf_max);
}
return 0;
}
int rtlsdr_set_center_freq(rtlsdr_dev_t *dev, uint32_t freq)
{
int r = -1;
@ -815,6 +856,52 @@ const char *rtlsdr_get_device_name(uint32_t index)
return "";
}
int rtlsdr_get_device_usb_strings(uint32_t index, char *manufact,
char *product, char *serial)
{
int r = -2;
int i;
libusb_context *ctx;
libusb_device **list;
struct libusb_device_descriptor dd;
rtlsdr_dongle_t *device = NULL;
rtlsdr_dev_t devt;
uint32_t device_count = 0;
ssize_t cnt;
libusb_init(&ctx);
cnt = libusb_get_device_list(ctx, &list);
for (i = 0; i < cnt; i++) {
libusb_get_device_descriptor(list[i], &dd);
device = find_known_device(dd.idVendor, dd.idProduct);
if (device) {
device_count++;
if (index == device_count - 1) {
r = libusb_open(list[i], &devt.devh);
if (!r) {
r = rtlsdr_get_usb_strings(&devt,
manufact,
product,
serial);
libusb_close(devt.devh);
}
break;
}
}
}
libusb_free_device_list(list, 1);
libusb_exit(ctx);
return r;
}
int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index)
{
int r;

10
src/rtl_sdr.c
View File

@ -107,6 +107,7 @@ int main(int argc, char **argv)
uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
uint32_t out_block_size = DEFAULT_BUF_LENGTH;
int device_count;
char vendor[256], product[256], serial[256];
#ifndef _WIN32
while ((opt = getopt(argc, argv, "d:f:g:s:b:S::")) != -1) {
switch (opt) {
@ -168,13 +169,14 @@ int main(int argc, char **argv)
}
fprintf(stderr, "Found %d device(s):\n", device_count);
for (i = 0; i < device_count; i++)
fprintf(stderr, " %d: %s\n", i, rtlsdr_get_device_name(i));
for (i = 0; i < device_count; i++) {
rtlsdr_get_device_usb_strings(i, vendor, product, serial);
fprintf(stderr, " %d: %s, %s, SN: %s\n", i, vendor, product, serial);
}
fprintf(stderr, "\n");
fprintf(stderr, "Using device %d: %s\n",
dev_index,
rtlsdr_get_device_name(dev_index));
dev_index, rtlsdr_get_device_name(dev_index));
r = rtlsdr_open(&dev, dev_index);
if (r < 0) {