drivers/stmpe811: provide adaption to touch_dev interface

drivers/include/stmpe811.h

@@ -25,6 +25,10 @@
 #include "periph/gpio.h"
 #include "periph/i2c.h"
 
+#ifdef MODULE_TOUCH_DEV
+#include "touch_dev.h"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -77,6 +81,9 @@ typedef struct {
  * @brief   Device descriptor for the STMPE811 sensor
  */
 typedef struct {
+#ifdef MODULE_TOUCH_DEV
+    touch_dev_t *dev;                   /**< Pointer to the generic touch device */
+#endif
     stmpe811_params_t params;           /**< Device parameters */
     uint16_t prev_x;                    /**< Previous X coordinate */
     uint16_t prev_y;                    /**< Previous Y coordinate */

drivers/stmpe811/include/stmpe811_touch_dev.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_stmpe811
+ * @{
+ *
+ * @file
+ * @brief       Definition of the driver for the touch_dev generic interface
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+#ifndef STMPE811_TOUCH_DEV_H
+#define STMPE811_TOUCH_DEV_H
+
+#include "touch_dev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Reference to the touch device driver struct
+ */
+extern const touch_dev_driver_t stmpe811_touch_dev_driver;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STMPE811_TOUCH_DEV_H */

drivers/stmpe811/stmpe811_touch_dev.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2020 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_stmpe811
+ * @{
+ *
+ * @file
+ * @brief       Driver adaption to touch_dev generic interface
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ * @}
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "kernel_defines.h"
+
+#include "stmpe811.h"
+#include "stmpe811_touch_dev.h"
+
+uint16_t _stmpe811_height(const touch_dev_t *touch_dev)
+{
+    const stmpe811_t *dev = (const stmpe811_t *)touch_dev;
+    assert(dev);
+
+    return dev->params.ymax;
+}
+
+uint16_t _stmpe811_width(const touch_dev_t *touch_dev)
+{
+    const stmpe811_t *dev = (const stmpe811_t *)touch_dev;
+    assert(dev);
+
+    return dev->params.xmax;
+}
+
+uint8_t _stmpe811_touches(const touch_dev_t *touch_dev, touch_t *touches, size_t len)
+{
+    (void)len;
+
+    stmpe811_t *dev = (stmpe811_t *)touch_dev;
+    assert(dev);
+
+    stmpe811_touch_state_t state;
+    stmpe811_read_touch_state(dev, &state);
+    uint8_t ret = (state == STMPE811_TOUCH_STATE_PRESSED);
+
+    if (ret && touches != NULL) {
+        stmpe811_touch_position_t pos;
+        stmpe811_read_touch_position(dev, &pos);
+        touches[0].x = pos.x;
+        touches[0].y = pos.y;
+    }
+
+    return ret;
+}
+
+const touch_dev_driver_t stmpe811_touch_dev_driver = {
+    .height     = _stmpe811_height,
+    .width      = _stmpe811_width,
+    .touches    = _stmpe811_touches,
+};