@@ -2400,6 +2400,35 @@ const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset)
}
EXPORT_SYMBOL_GPL(gpiochip_is_requested);
+/**
+ * gpiochip_dup_line_label - Get a copy of the consumer label.
+ * @gc: GPIO chip controlling this line.
+ * @offset: Hardware offset of the line.
+ *
+ * Returns:
+ * Pointer to a copy of the consumer label if the line is requested or NULL
+ * if it's not. If a valid pointer was returned, it must be freed using
+ * kfree(). In case of a memory allocation error, the function returns %ENOMEM.
+ *
+ * Must not be called from atomic context.
+ */
+char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset)
+{
+ const char *label;
+ char *copy;
+
+ label = gpiochip_is_requested(gc, offset);
+ if (!label)
+ return NULL;
+
+ copy = kstrdup(label, GFP_KERNEL);
+ if (!copy)
+ return ERR_PTR(-ENOMEM);
+
+ return copy;
+}
+EXPORT_SYMBOL_GPL(gpiochip_dup_line_label);
+
/**
* gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
* @gc: GPIO chip
@@ -532,6 +532,7 @@ struct gpio_chip {
};
const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset);
+char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset);
/**
* for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range