X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/61e5bc764f2b35c333b11e5421c2e2495923b321..80417f30dc0d1ff825d887032507511be4dcc11b:/src/am7xxx.c

diff --git a/src/am7xxx.c b/src/am7xxx.c
index dd69fc5..84d7e9c 100644
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -341,7 +341,7 @@ static inline unsigned int in_80chars(unsigned int i)
 {
 	/* The 3 below is the length of "xx " where xx is the hex string
 	 * representation of a byte */
-	return ((i+1) % (80/3));
+	return ((i + 1) % (80 / 3));
 }
 
 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
@@ -720,7 +720,6 @@ static int open_device(am7xxx_context *ctx,
 
 	/* the usb device has already been opened */
 	if ((*dev)->usb_device) {
-		debug(ctx, "(*dev)->usb_device already set\n");
 		ret = 1;
 		goto out;
 	}
@@ -801,7 +800,7 @@ static int open_device(am7xxx_context *ctx,
 	}
 
 	if (current_configuration != (*dev)->desc->configuration) {
-		debug(ctx, "libusb configuration changed (expected: %hhu, current: %hhu\n",
+		debug(ctx, "libusb configuration changed (expected: %hhu, current: %d)\n",
 		      (*dev)->desc->configuration, current_configuration);
 		ret = -EINVAL;
 		goto out_libusb_release_interface;
@@ -1094,8 +1093,7 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 	*ctx = malloc(sizeof(**ctx));
 	if (*ctx == NULL) {
 		fatal("cannot allocate the context (%s)\n", strerror(errno));
-		ret = -ENOMEM;
-		goto out;
+		return -ENOMEM;
 	}
 	memset(*ctx, 0, sizeof(**ctx));
 
@@ -1181,14 +1179,14 @@ AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 	 * is the first one to be sent to the device in order for it to
 	 * successfully return the correct device information.
 	 *
-	 * So, if there is not a cached version of it (from a previous open),
-	 * we ask for device info at open time,
+	 * NOTE: am7xxx_get_device_info() will fetch the actual device info
+	 * from the device only the very first time it's called for a given
+	 * device, otherwise, it'll return a cached version of the device info
+	 * (from a previous call to am7xxx_open_device(), for instance).
 	 */
-	if ((*dev)->device_info == NULL) {
-		ret = am7xxx_get_device_info(*dev, NULL);
-		if (ret < 0)
-			error(ctx, "cannot get device info\n");
-	}
+	ret = am7xxx_get_device_info(*dev, NULL);
+	if (ret < 0)
+		error(ctx, "cannot get device info\n");
 
 out:
 	return ret;
@@ -1215,10 +1213,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 	int ret;
 	struct am7xxx_header h;
 
-	if (dev->device_info) {
-		memcpy(device_info, dev->device_info, sizeof(*device_info));
-		return 0;
-	}
+	/* if there is a cached copy of the device info, just return that */
+	if (dev->device_info)
+		goto return_value;
 
 	ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
 	if (ret < 0)
@@ -1252,6 +1249,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
 	dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
 #endif
 
+return_value:
+	if (device_info)
+		memcpy(device_info, dev->device_info, sizeof(*device_info));
 	return 0;
 }
 
@@ -1262,7 +1262,6 @@ AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
 					unsigned int *scaled_width,
 					unsigned int *scaled_height)
 {
-
 	am7xxx_device_info device_info;
 	float width_ratio;
 	float height_ratio;