ftdi-la: Cleanup ftdi_context handling

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

src/hardware/ftdi-la/api.c

@@ -82,7 +82,8 @@ static const struct ftdi_chip_desc *chip_descs[] = {
 	&ft232r_desc,
 };
 
-static void scan_device(struct sr_dev_driver *di, struct libusb_device *dev, GSList **devices)
+static void scan_device(struct sr_dev_driver *di, struct ftdi_context *ftdic,
+	struct libusb_device *dev, GSList **devices)
 {
 	struct libusb_device_descriptor usb_desc;
 	const struct ftdi_chip_desc *desc;
@@ -115,20 +116,15 @@ static void scan_device(struct sr_dev_driver *di, struct libusb_device *dev, GSL
 	/* Allocate memory for the incoming data. */
 	devc->data_buf = g_malloc0(DATA_BUF_SIZE);
 
-	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
-	devc->ftdic = ftdi_new();
-	if (!devc->ftdic) {
-		sr_err("Failed to initialize libftdi.");
-		goto err_free_data_buf;
-	}
+	snprintf(devc->address, sizeof(devc->address), "d:%u/%u",
+		libusb_get_bus_number(dev), libusb_get_device_address(dev));
 
-	devc->usbdev = dev;
 	devc->desc = desc;
 
 	vendor = g_malloc(32);
 	model = g_malloc(32);
 	serial_num = g_malloc(32);
-	rv = ftdi_usb_get_strings(devc->ftdic, dev, vendor, 32,
+	rv = ftdi_usb_get_strings(ftdic, dev, vendor, 32,
 			     model, 32, serial_num, 32);
 	switch (rv) {
 	case 0:
@@ -165,59 +161,45 @@ err_free_strings:
 	g_free(vendor);
 	g_free(model);
 	g_free(serial_num);
-	ftdi_free(devc->ftdic);
-err_free_data_buf:
 	g_free(devc->data_buf);
 	g_free(devc);
 }
 
-static GSList *scan_all(struct sr_dev_driver *di, GSList *options)
+static GSList *scan_all(struct ftdi_context *ftdic, struct sr_dev_driver *di,
+	GSList *options)
 {
 	GSList *devices;
 	struct ftdi_device_list *devlist = 0;
 	struct ftdi_device_list *curdev;
-	struct ftdi_context *ftdic;
 	int ret;
 
 	(void)options;
 
 	devices = NULL;
 
-	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
-	ftdic = ftdi_new();
-	if (!ftdic) {
-		sr_err("Failed to initialize libftdi.");
-		return NULL;
-	}
-
 	ret = ftdi_usb_find_all(ftdic, &devlist, 0, 0);
 	if (ret < 0) {
 		sr_err("Failed to list devices (%d): %s", ret,
 		       ftdi_get_error_string(ftdic));
-		goto err_free_ftdic;
+		return NULL;
 	}
 
 	sr_dbg("Number of FTDI devices found: %d", ret);
 
 	curdev = devlist;
 	while (curdev) {
-		scan_device(di, curdev->dev, &devices);
+		scan_device(di, ftdic, curdev->dev, &devices);
 		curdev = curdev->next;
 	}
 
 	ftdi_list_free(&devlist);
-	ftdi_free(ftdic);
 
 	return devices;
-
-err_free_ftdic:
-	ftdi_free(ftdic); /* NOT free() or g_free()! */
-
-	return NULL;
 }
 
 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 {
+	struct ftdi_context *ftdic;
 	struct sr_config *src;
 	struct sr_usb_dev_inst *usb;
 	const char *conn;
@@ -237,6 +219,14 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 			break;
 		}
 	}
+
+	/* Allocate memory for the FTDI context (ftdic) and initialize it. */
+	ftdic = ftdi_new();
+	if (!ftdic) {
+		sr_err("Failed to initialize libftdi.");
+		return NULL;
+	}
+
 	if (conn) {
 		devices = NULL;
 		libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
@@ -246,14 +236,17 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 				usb = l->data;
 				if (usb->bus == libusb_get_bus_number(devlist[i])
 					&& usb->address == libusb_get_device_address(devlist[i])) {
-					scan_device(di, devlist[i], &devices);
+					scan_device(di, ftdic, devlist[i], &devices);
 				}
 			}
 		}
 		libusb_free_device_list(devlist, 1);
-		return devices;
 	} else
-		return scan_all(di, options);
+		devices = scan_all(ftdic, di, options);
+
+	ftdi_free(ftdic);
+
+	return devices;
 }
 
 static void clear_helper(void *priv)
@@ -261,8 +254,6 @@ static void clear_helper(void *priv)
 	struct dev_context *devc;
 
 	devc = priv;
-
-	ftdi_free(devc->ftdic);
 	g_free(devc->data_buf);
 	g_free(devc);
 }
@@ -279,13 +270,17 @@ static int dev_open(struct sr_dev_inst *sdi)
 
 	devc = sdi->priv;
 
-	ret = ftdi_usb_open_dev(devc->ftdic, devc->usbdev);
+	devc->ftdic = ftdi_new();
+	if (!devc->ftdic)
+		return SR_ERR;
+
+	ret = ftdi_usb_open_string(devc->ftdic, devc->address);
 	if (ret < 0) {
 		/* Log errors, except for -3 ("device not found"). */
 		if (ret != -3)
 			sr_err("Failed to open device (%d): %s", ret,
 			       ftdi_get_error_string(devc->ftdic));
-		return SR_ERR;
+		goto err_ftdi_free;
 	}
 
 	/* Purge RX/TX buffers in the FTDI chip. */
@@ -317,9 +312,10 @@ static int dev_open(struct sr_dev_inst *sdi)
 	sdi->status = SR_ST_ACTIVE;
 
 	return SR_OK;
-
 err_dev_open_close_ftdic:
 	ftdi_usb_close(devc->ftdic);
+err_ftdi_free:
+	ftdi_free(devc->ftdic);
 	return SR_ERR;
 }
 
@@ -329,7 +325,11 @@ static int dev_close(struct sr_dev_inst *sdi)
 
 	devc = sdi->priv;
 
-	ftdi_usb_close(devc->ftdic);
+	if (devc->ftdic) {
+		ftdi_usb_close(devc->ftdic);
+		ftdi_free(devc->ftdic);
+		devc->ftdic = NULL;
+	}
 
 	sdi->status = SR_ST_INACTIVE;
 

src/hardware/ftdi-la/protocol.h

@@ -40,7 +40,7 @@ struct ftdi_chip_desc {
 struct dev_context {
 	struct ftdi_context *ftdic;
 	const struct ftdi_chip_desc *desc;
-	struct libusb_device *usbdev;
+	char address[sizeof("d:000:000")];
 
 	uint64_t limit_samples;
 	uint32_t cur_samplerate;