am7xxx: factor out an open_device() function from scan_devices()

This reduces the indentation level and makes the code more readable, now
it will be easier to improve open_device().

diff --git a/src/am7xxx.c b/src/am7xxx.c
index f874469..006b216 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -702,6 +702,59 @@ static am7xxx_device *find_device(am7xxx_context *ctx,
        return current;
 }
 
+static int open_device(am7xxx_context *ctx,
+                      unsigned int device_index,
+                      libusb_device* usb_dev,
+                      am7xxx_device **dev)
+{
+       int ret;
+
+       *dev = find_device(ctx, device_index);
+       if (*dev == NULL) {
+               ret = -ENODEV;
+               goto out;
+       }
+
+       /* the usb device has already been opened */
+       if ((*dev)->usb_device) {
+               debug(ctx, "(*dev)->usb_device already set\n");
+               ret = 1;
+               goto out;
+       }
+
+       ret = libusb_open(usb_dev, &((*dev)->usb_device));
+       if (ret < 0) {
+               debug(ctx, "libusb_open failed\n");
+               goto out;
+       }
+
+       /* XXX, the device is now open, if any of the calls below fail we need
+        * to close it again before bailing out.
+        */
+
+       ret = libusb_set_configuration((*dev)->usb_device,
+                                      (*dev)->desc->configuration);
+       if (ret < 0) {
+               debug(ctx, "libusb_set_configuration failed\n");
+               debug(ctx, "Cannot set configuration %hhu\n",
+                     (*dev)->desc->configuration);
+               goto out_libusb_close;
+       }
+
+       ret = libusb_claim_interface((*dev)->usb_device,
+                                    (*dev)->desc->interface_number);
+       if (ret < 0) {
+               debug(ctx, "libusb_claim_interface failed\n");
+               debug(ctx, "Cannot claim interface %hhu\n",
+                     (*dev)->desc->interface_number);
+out_libusb_close:
+               libusb_close((*dev)->usb_device);
+               (*dev)->usb_device = NULL;
+       }
+out:
+       return ret;
+}
+
 typedef enum {
        SCAN_OP_BUILD_DEVLIST,
        SCAN_OP_OPEN_DEVICE,
@@ -780,48 +833,12 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                                } else if (op == SCAN_OP_OPEN_DEVICE &&
                                           current_index == open_device_index) {
 
-                                       *dev = find_device(ctx, open_device_index);
-                                       if (*dev == NULL) {
-                                               ret = -ENODEV;
-                                               goto out;
-                                       }
-
-                                       /* the usb device has already been opened */
-                                       if ((*dev)->usb_device) {
-                                               debug(ctx, "(*dev)->usb_device already set\n");
-                                               ret = 1;
-                                               goto out;
-                                       }
-
-                                       ret = libusb_open(list[i], &((*dev)->usb_device));
-                                       if (ret < 0) {
-                                               debug(ctx, "libusb_open failed\n");
-                                               goto out;
-                                       }
-
-                                       /* XXX, the device is now open, if any
-                                        * of the calls below fail we need to
-                                        * close it again before bailing out.
-                                        */
-
-                                       ret = libusb_set_configuration((*dev)->usb_device,
-                                                                      (*dev)->desc->configuration);
+                                       ret = open_device(ctx,
+                                                         open_device_index,
+                                                         list[i],
+                                                         dev);
                                        if (ret < 0) {
-                                               debug(ctx, "libusb_set_configuration failed\n");
-                                               debug(ctx, "Cannot set configuration %hhu\n",
-                                                     (*dev)->desc->configuration);
-                                               goto out_libusb_close;
-                                       }
-
-                                       ret = libusb_claim_interface((*dev)->usb_device,
-                                                                    (*dev)->desc->interface_number);
-                                       if (ret < 0) {
-                                               debug(ctx, "libusb_claim_interface failed\n");
-                                               debug(ctx, "Cannot claim interface %hhu\n",
-                                                     (*dev)->desc->interface_number);
-out_libusb_close:
-                                               libusb_close((*dev)->usb_device);
-                                               (*dev)->usb_device = NULL;
+                                               debug(ctx, "open_device failed\n");
                                                goto out;
                                        }