usbtmc: only reset Siglent (and Atten) devices in open

[libsigrok.git] / src / scpi / scpi_usbtmc_libusb.c

diff --git a/src/scpi/scpi_usbtmc_libusb.c b/src/scpi/scpi_usbtmc_libusb.c
index 7e49a8a0f12b9aef7a195cb28e5da801b9c83329..a109703ea0318d81d43877cc2fa1364a625b1cab 100644 (file)
--- a/src/scpi/scpi_usbtmc_libusb.c
+++ b/src/scpi/scpi_usbtmc_libusb.c
@@ -111,6 +111,12 @@ static struct usbtmc_blacklist blacklist_remote[] = {
        ALL_ZERO
 };
 
+/* Devices that shall get reset during open(). */
+static struct usbtmc_blacklist whitelist_usb_reset[] = {
+       { 0xf4ec, 0xffff }, /* All Siglent SDS devices */
+       ALL_ZERO
+};
+
 static GSList *scpi_usbtmc_libusb_scan(struct drv_context *drvc)
 {
        struct libusb_device **devlist;
@@ -291,6 +297,7 @@ static int scpi_usbtmc_libusb_open(struct sr_scpi_dev_inst *scpi)
        int confidx, intfidx, epidx, config = 0, current_config;
        uint8_t capabilities[24];
        int ret, found = 0;
+       int do_reset;
 
        if (usb->devhdl)
                return SR_OK;
@@ -371,7 +378,11 @@ static int scpi_usbtmc_libusb_open(struct sr_scpi_dev_inst *scpi)
                return SR_ERR;
        }
 
-       libusb_reset_device(usb->devhdl);
+       /* Optionally reset the USB device. */
+       do_reset = check_usbtmc_blacklist(whitelist_usb_reset,
+               des.idVendor, des.idProduct);
+       if (do_reset)
+               libusb_reset_device(usb->devhdl);
 
        /* Get capabilities. */
        ret = libusb_control_transfer(usb->devhdl, LIBUSB_ENDPOINT_IN |