X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=std.c;h=5bea8985604914314d0a9cfd46e2bda8b405a87d;hb=decfe89d4e8c0902c1ca56933f2da30b97e9fa72;hp=5eb2e57d8e9808f19c1e13588484f92ead7592d4;hpb=cd2f0fe22c35dcf3b010411ff6f123701be2a2d6;p=libsigrok.git

diff --git a/std.c b/std.c
index 5eb2e57d..5bea8985 100644
--- a/std.c
+++ b/std.c
@@ -1,5 +1,5 @@
 /*
- * This file is part of the sigrok project.
+ * This file is part of the libsigrok project.
  *
  * Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
  *
@@ -47,12 +47,13 @@ SR_PRIV int std_hw_init(struct sr_context *sr_ctx, struct sr_dev_driver *di,
 		return SR_ERR_ARG;
 	}
 
-	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
+	if (!(drvc = g_try_malloc(sizeof(struct drv_context)))) {
 		sr_err("%sDriver context malloc failed.", prefix);
 		return SR_ERR_MALLOC;
 	}
 
 	drvc->sr_ctx = sr_ctx;
+	drvc->instances = NULL;
 	di->priv = drvc;
 
 	return SR_OK;
@@ -159,3 +160,63 @@ SR_PRIV int std_hw_dev_acquisition_stop_serial(struct sr_dev_inst *sdi,
 
 	return SR_OK;
 }
+
+/*
+ * Standard driver dev_clear() helper.
+ *
+ * This function can be used to implement the dev_clear() driver API
+ * callback. dev_close() is called before every sr_dev_inst is cleared.
+ *
+ * The only limitation is driver-specific device contexts (sdi->priv).
+ * These are freed, but any dynamic allocation within structs stored
+ * there cannot be freed.
+ *
+ * @param driver The driver which will have its instances released.
+ * @param clear_private If not NULL, this points to a function called
+ * with sdi->priv as argument. The function can then clear any device
+ * instance-specific resources kept there. It must also clear the struct
+ * pointed to by sdi->priv.
+ *
+ * @return SR_OK on success.
+ */
+SR_PRIV int std_dev_clear(const struct sr_dev_driver *driver,
+		std_dev_clear_t clear_private)
+{
+	struct drv_context *drvc;
+	struct sr_dev_inst *sdi;
+	GSList *l;
+	int ret;
+
+	if (!(drvc = driver->priv))
+		/* Driver was never initialized, nothing to do. */
+		return SR_OK;
+
+	ret = SR_OK;
+	for (l = drvc->instances; l; l = l->next) {
+		if (!(sdi = l->data)) {
+			ret = SR_ERR_BUG;
+			continue;
+		}
+		if (driver->dev_close)
+			driver->dev_close(sdi);
+
+		if (sdi->conn) {
+			 if (sdi->inst_type == SR_INST_SERIAL)
+				sr_serial_dev_inst_free(sdi->conn);
+#if HAVE_LIBUSB_1_0
+			else if (sdi->inst_type == SR_INST_USB)
+				sr_usb_dev_inst_free(sdi->conn);
+#endif
+		}
+		if (clear_private)
+			clear_private(sdi->priv);
+		else
+			g_free(sdi->priv);
+		sr_dev_inst_free(sdi);
+	}
+
+	g_slist_free(drvc->instances);
+	drvc->instances = NULL;
+
+	return ret;
+}