From a5a08f0d6384717fe2e957d6feaf0300fa2a8337 Mon Sep 17 00:00:00 2001
From: Gunar Schorcht <gunar@schorcht.net>
Date: Mon, 14 Aug 2023 17:48:51 +0200
Subject: [PATCH] drivers/touch_dev: add a function to get the maximum number
 of touches

---
 drivers/include/touch_dev.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/include/touch_dev.h b/drivers/include/touch_dev.h
index 8d2c38636c..4d0b898521 100644
--- a/drivers/include/touch_dev.h
+++ b/drivers/include/touch_dev.h
@@ -76,6 +76,18 @@ typedef struct {
      */
     uint16_t (*width)(const touch_dev_t *dev);
 
+    /**
+     * @brief   Get the maximum number of touches the touch device supports
+     *
+     * This function pointer can be NULL. In this case, the maximum number of
+     * touches is assumed to be 1.
+     *
+     * @param[in] dev       Pointer to the touch device
+     *
+     * @return              number of touches
+     */
+    uint8_t (*max_numof)(const touch_dev_t *dev);
+
     /**
      * @brief   Get the current touches on the touch device
      *
@@ -157,6 +169,19 @@ uint16_t touch_dev_height(const touch_dev_t *dev);
  */
 uint16_t touch_dev_width(const touch_dev_t *dev);
 
+/**
+ * @brief   Get the maximum number of touches the touch device supports
+ *
+ * @param[in] dev       Pointer to the touch device
+ *
+ * @return              number of touches
+ */
+static inline uint8_t touch_dev_max_numof(const touch_dev_t *dev)
+{
+    assert(dev);
+    return (dev->driver->max_numof) ? dev->driver->max_numof(dev) : 1;
+}
+
 /**
  * @brief   Get the current touches on the touch device
  *