From 528d884b5d88967f9d5011c27f6d509c60022412 Mon Sep 17 00:00:00 2001
From: Alexandre Abadie <alexandre.abadie@inria.fr>
Date: Mon, 20 Jul 2020 16:37:51 +0200
Subject: [PATCH] drivers/touch_dev: extend API to set event callback function

---
 drivers/include/touch_dev.h   | 25 +++++++++++++++++++++++++
 drivers/touch_dev/touch_dev.c |  6 ++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/include/touch_dev.h b/drivers/include/touch_dev.h
index 14f6157248..49bba79586 100644
--- a/drivers/include/touch_dev.h
+++ b/drivers/include/touch_dev.h
@@ -41,6 +41,13 @@ typedef struct {
     uint16_t y;     /**< Y coordinate */
 } touch_t;
 
+/**
+ * @brief   Signature of touch event callback triggered from interrupt
+ *
+ * @param[in] arg       optional context for the callback
+ */
+typedef void (*touch_event_cb_t)(void *arg);
+
 /**
  * @brief   Generic type for a touch driver
  */
@@ -75,6 +82,15 @@ typedef struct {
      * @return              number of touch positions, 0 means no touch
      */
     uint8_t (*touches)(const touch_dev_t *dev, touch_t *touches, size_t len);
+
+    /**
+     * @brief   Set and configure the touch event callback
+     *
+     * @param[in] dev       Pointer to the touch device
+     * @param[in] cb        The callback function
+     * @param[in] arg       Context argument
+     */
+    void (*set_event_callback)(const touch_dev_t *dev, touch_event_cb_t cb, void *arg);
 } touch_dev_driver_t;
 
 /**
@@ -150,6 +166,15 @@ uint16_t touch_dev_width(const touch_dev_t *dev);
  */
 uint8_t touch_dev_touches(const touch_dev_t *dev, touch_t *touches, size_t len);
 
+/**
+ * @brief   Set and configure the touch event callback
+ *
+ * @param[in] dev       Pointer to the touch device
+ * @param[in] cb        The callback function
+ * @param[in] arg       Context argument
+ */
+void touch_dev_set_touch_event_callback(const touch_dev_t *dev, touch_event_cb_t cb, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/drivers/touch_dev/touch_dev.c b/drivers/touch_dev/touch_dev.c
index 9e08638a63..8076ca416f 100644
--- a/drivers/touch_dev/touch_dev.c
+++ b/drivers/touch_dev/touch_dev.c
@@ -82,3 +82,9 @@ uint8_t touch_dev_touches(const touch_dev_t *dev, touch_t *touches, size_t len)
 
     return dev->driver->touches(dev, touches, len);
 }
+
+void touch_dev_set_touch_event_callback(const touch_dev_t *dev, touch_event_cb_t cb, void *arg)
+{
+    assert(dev);
+    dev->driver->set_event_callback(dev, cb, arg);
+}