drivers/lis2dh12: add SAUL mapping

drivers/include/lis2dh12.h

@@ -33,6 +33,7 @@
 #ifndef LIS2DH12_H
 #define LIS2DH12_H
 
+#include "saul.h"
 #include "periph/spi.h"
 #include "periph/gpio.h"
 
@@ -98,6 +99,11 @@ enum {
     LIS2DH12_NODEV = -2,            /**< unable to talk to device */
 };
 
+/**
+ * @brief   Export the SAUL interface for this driver
+ */
+extern const saul_driver_t lis2dh12_saul_driver;
+
 /**
  * @brief   Initialize the given LIS2DH12 sensor device
  *

drivers/lis2dh12/include/lis2dh12_params.h

@@ -21,6 +21,7 @@
 
 #include "board.h"
 #include "lis2dh12.h"
+#include "saul_reg.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -43,10 +44,16 @@ extern "C" {
 #define LIS2DH12_PARAM_RATE         LIS2DH12_RATE_100HZ
 #endif
 
-#define LIS2DH12_PARAMS_DEFAULT     { .spi = LIS2DH12_PARAM_SPI,     \
+#ifndef LIS2DH12_PARAMS
+#define LIS2DH12_PARAMS             { .spi = LIS2DH12_PARAM_SPI,     \
                                       .cs = LIS2DH12_PARAM_CS,       \
                                       .scale = LIS2DH12_PARAM_SCALE, \
                                       .rate  = LIS2DH12_PARAM_RATE }
+#endif
+
+#ifndef LIS2DH12_SAULINFO
+#define LIS2DH12_SAULINFO           { .name = "lis2dh12" }
+#endif
 /**@}*/
 
 /**
@@ -54,11 +61,15 @@ extern "C" {
  */
 static const lis2dh12_params_t lis2dh12_params[] =
 {
-#ifdef LIS2DH12_PARAMS_BOARD
+    LIS2DH12_PARAMS
-    LIS2DH12_PARAMS_BOARD,
+};
-#else
+
-    LIS2DH12_PARAMS_DEFAULT,
+/**
-#endif
+ * @brief   Additional meta information to keep in the SAUL registry
+ */
+static const saul_reg_info_t lis2dh12_saul_info[] =
+{
+    LIS2DH12_SAULINFO
 };
 
 #ifdef __cplusplus

drivers/lis2dh12/lis2dh12_saul.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2018 Freie Universität Berlin
+ *
+ * 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_lis2dh12
+ * @{
+ *
+ * @file
+ * @brief       LIS2DH12 accelerometer SAUL mapping
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include "saul.h"
+#include "lis2dh12.h"
+
+static int read_accelerometer(const void *dev, phydat_t *res)
+{
+    if (lis2dh12_read((const lis2dh12_t *)dev, res->val) != LIS2DH12_OK) {
+        return 0;
+    }
+    res->unit = UNIT_G;
+    res->scale = -3;
+    return 3;
+}
+
+const saul_driver_t lis2dh12_saul_driver = {
+    .read = read_accelerometer,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_ACCEL
+};