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add USBTMC device search helper

This commit is contained in:
Bert Vermeulen 2012-12-30 01:44:58 +01:00
parent 80bc663296
commit 9116262931
2 changed files with 61 additions and 0 deletions
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60
hardware/common/usb.c
View File

@ -29,6 +29,10 @@
#define CONN_USB_VIDPID "^([0-9a-z]{1,4})\\.([0-9a-z]{1,4})$"
#define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$"
/* Some USBTMC-specific enums, as defined in the USBTMC standard. */
#define SUBCLASS_USBTMC 0x03
#define USBTMC_USB488 0x01
/* Message logging helpers with driver-specific prefix string. */
#define DRIVER_LOG_DOMAIN "usb: "
#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
@ -138,6 +142,62 @@ SR_PRIV GSList *sr_usb_find(libusb_context *usb_ctx, const char *conn)
return devices;
}
/**
* Find USB devices supporting the USBTMC class
*
* @param usb_ctx libusb context to use while scanning.
*
* @return A GSList of struct sr_usb_dev_inst, with bus and address fields
* indicating devices with USBTMC support.
*/
SR_PRIV GSList *sr_usb_find_usbtmc(libusb_context *usb_ctx)
{
struct sr_usb_dev_inst *usb;
struct libusb_device **devlist;
struct libusb_device_descriptor des;
struct libusb_config_descriptor *confdes;
const struct libusb_interface_descriptor *intfdes;
GSList *devices;
int confidx, intfidx, ret, i;
devices = NULL;
libusb_get_device_list(usb_ctx, &devlist);
for (i = 0; devlist[i]; i++) {
if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
sr_err("Failed to get device descriptor: %s.",
libusb_error_name(ret));
continue;
}
for (confidx = 0; confidx < des.bNumConfigurations; confidx++) {
if (libusb_get_config_descriptor(devlist[i], confidx, &confdes) != 0) {
sr_err("Failed to get configuration descriptor.");
break;
}
for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) {
intfdes = confdes->interface[intfidx].altsetting;
if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION
|| intfdes->bInterfaceSubClass != SUBCLASS_USBTMC
|| intfdes->bInterfaceProtocol != USBTMC_USB488)
continue;
sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, bus.address = "
"%d.%d).", des.idVendor, des.idProduct,
libusb_get_bus_number(devlist[i]),
libusb_get_device_address(devlist[i]));
usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
libusb_get_device_address(devlist[i]), NULL);
devices = g_slist_append(devices, usb);
}
}
}
libusb_free_device_list(devlist, 1);
sr_dbg("Found %d device(s).", g_slist_length(devices));
return devices;
}
SR_PRIV int sr_usb_open(libusb_context *usb_ctx, struct sr_usb_dev_inst *usb)
{
struct libusb_device **devlist;

1
libsigrok-internal.h
View File

@ -103,6 +103,7 @@ SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi);
/* USB-specific instances */
SR_PRIV struct sr_usb_dev_inst *sr_usb_dev_inst_new(uint8_t bus,
uint8_t address, struct libusb_device_handle *hdl);
SR_PRIV GSList *sr_usb_find_usbtmc(libusb_context *usb_ctx);
SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb);
#endif