From: Soeren Apel <redacted>
Date: Mon, 6 Jul 2015 19:20:26 +0000 (+0200)
Subject: fx2lafw: Fix #445 by detaching the kernel driver (if any)
X-Git-Tag: libsigrok-0.4.0~465
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=39e4517759d391e5572e81d9796d4d8c6892d25e

fx2lafw: Fix #445 by detaching the kernel driver (if any)

This avoids the need to run "rmmod usbtest" on Linux for devices
with the standard Cypress FX2 USB VID/PID (04b4:8613).
---

diff --git a/src/hardware/fx2lafw/api.c b/src/hardware/fx2lafw/api.c
index ada4fcc9..724e2dd4 100644
--- a/src/hardware/fx2lafw/api.c
+++ b/src/hardware/fx2lafw/api.c
@@ -370,6 +370,16 @@ static int dev_open(struct sr_dev_inst *sdi)
 	devc = sdi->priv;
 	usb = sdi->conn;
 
+	if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
+		if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
+			if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
+				sr_err("Failed to detach kernel driver: %s.",
+					libusb_error_name(ret));
+				return SR_ERR;
+			}
+		}
+	}
+
 	/*
 	 * If the firmware was recently uploaded, wait up to MAX_RENUM_DELAY_MS
 	 * milliseconds for the FX2 to renumerate.