From: Soeren Apel <redacted>
Date: Fri, 26 Sep 2014 17:25:36 +0000 (+0200)
Subject: fx2lafw: Use physical USB connection instead of sdi->index
X-Git-Tag: libsigrok-0.4.0~935
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=5e2c86eb3184fdc57341f6a1dd482f83556bf1d9;p=libsigrok.git

fx2lafw: Use physical USB connection instead of sdi->index

Previously, sdi->index was used to tell several identical fx2lafw-compatible
devices apart. This was a bit of a hack, so this patch makes it use physical
device connections instead. They're guaranteed to remain the same even if
the USB device reconnects.
---

diff --git a/src/hardware/fx2lafw/api.c b/src/hardware/fx2lafw/api.c
index 18a34df6..8e28f224 100644
--- a/src/hardware/fx2lafw/api.c
+++ b/src/hardware/fx2lafw/api.c
@@ -140,9 +140,9 @@ static GSList *scan(GSList *options)
 	struct libusb_device_descriptor des;
 	libusb_device **devlist;
 	struct libusb_device_handle *hdl;
-	int devcnt, num_logic_channels, ret, i, j;
+	int num_logic_channels, ret, i, j;
 	const char *conn;
-	char manufacturer[64], product[64];
+	char manufacturer[64], product[64], serial_num[64], connection_id[64];
 
 	drvc = di->priv;
 
@@ -207,6 +207,18 @@ static GSList *scan(GSList *options)
 			continue;
 		}
 
+		if (des.iSerialNumber == 0) {
+			serial_num[0] = '\0';
+		} else if ((ret = libusb_get_string_descriptor_ascii(hdl,
+				des.iSerialNumber, (unsigned char *) serial_num,
+				sizeof(serial_num))) < 0) {
+			sr_warn("Failed to get serial number string descriptor: %s.",
+				libusb_error_name(ret));
+			continue;
+		}
+
+		usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
+
 		libusb_close(hdl);
 
 		prof = NULL;
@@ -226,12 +238,13 @@ static GSList *scan(GSList *options)
 		if (!prof)
 			continue;
 
-		devcnt = g_slist_length(drvc->instances);
-		sdi = sr_dev_inst_new(devcnt, SR_ST_INITIALIZING,
+		sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING,
 			prof->vendor, prof->model, prof->model_version);
 		if (!sdi)
 			return NULL;
 		sdi->driver = di;
+		sdi->serial_num = g_strdup(serial_num);
+		sdi->connection_id = g_strdup(connection_id);
 
 		/* Fill in channellist according to this device's profile. */
 		num_logic_channels = prof->dev_caps & DEV_CAPS_16BIT ? 16 : 8;
@@ -262,7 +275,9 @@ static GSList *scan(GSList *options)
 				devc->fw_updated = g_get_monotonic_time();
 			else
 				sr_err("Firmware upload failed for "
-				       "device %d.", devcnt);
+				       "device %d.%d (logical).",
+				       libusb_get_bus_number(devlist[i]),
+				       libusb_get_device_address(devlist[i]));
 			sdi->inst_type = SR_INST_USB;
 			sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
 					0xff, NULL);
@@ -358,8 +373,8 @@ static int dev_close(struct sr_dev_inst *sdi)
 	if (usb->devhdl == NULL)
 		return SR_ERR;
 
-	sr_info("fx2lafw: Closing device %d on %d.%d interface %d.",
-		sdi->index, usb->bus, usb->address, USB_INTERFACE);
+	sr_info("fx2lafw: Closing device on %d.%d (logical) / %s (physical) interface %d.",
+		usb->bus, usb->address, sdi->connection_id, USB_INTERFACE);
 	libusb_release_interface(usb->devhdl, USB_INTERFACE);
 	libusb_close(usb->devhdl);
 	usb->devhdl = NULL;
diff --git a/src/hardware/fx2lafw/protocol.c b/src/hardware/fx2lafw/protocol.c
index dfd58bec..7e7b1891 100644
--- a/src/hardware/fx2lafw/protocol.c
+++ b/src/hardware/fx2lafw/protocol.c
@@ -198,8 +198,9 @@ SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 	struct dev_context *devc;
 	struct drv_context *drvc;
 	struct version_info vi;
-	int ret, skip, i, device_count;
+	int ret, i, device_count;
 	uint8_t revid;
+	char connection_id[64];
 
 	drvc = di->priv;
 	devc = sdi->priv;
@@ -209,7 +210,6 @@ SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 		/* Device is already in use. */
 		return SR_ERR;
 
-	skip = 0;
 	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	if (device_count < 0) {
 		sr_err("Failed to get device list: %s.",
@@ -228,19 +228,13 @@ SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 		    || des.idProduct != devc->profile->pid)
 			continue;
 
-		if (sdi->status == SR_ST_INITIALIZING) {
-			if (skip != sdi->index) {
-				/* Skip devices of this type that aren't the one we want. */
-				skip += 1;
-				continue;
-			}
-		} else if (sdi->status == SR_ST_INACTIVE) {
+		if ((sdi->status == SR_ST_INITIALIZING) ||
+				(sdi->status == SR_ST_INACTIVE)) {
 			/*
-			 * This device is fully enumerated, so we need to find
-			 * this device by vendor, product, bus and address.
+			 * Check device by its physical USB bus/port address.
 			 */
-			if (libusb_get_bus_number(devlist[i]) != usb->bus
-				|| libusb_get_device_address(devlist[i]) != usb->address)
+			usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
+			if (strcmp(sdi->connection_id, connection_id))
 				/* This is not the one. */
 				continue;
 		}
@@ -283,9 +277,9 @@ SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 		}
 
 		sdi->status = SR_ST_ACTIVE;
-		sr_info("Opened device %d on %d.%d, "
+		sr_info("Opened device on %d.%d (logical) / %s (physical), "
 			"interface %d, firmware %d.%d.",
-			sdi->index, usb->bus, usb->address,
+			usb->bus, usb->address, connection_id,
 			USB_INTERFACE, vi.major, vi.minor);
 
 		sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",