drivers/sds011: add saul integration

drivers/sds011/sds011_saul.c

+/*
+ * Copyright (C) 2018 HAW-Hamburg
+ *
+ * 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_sds011
+ * @{
+ *
+ * @file
+ * @brief       SAUL adaption for SDS011 sensor
+ *
+ * @author      Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "saul.h"
+#include "sds011.h"
+#include "xtimer.h"
+
+static int _read(const void *dev, phydat_t *res)
+{
+    sds011_data_t data;
+
+    if (sds011_read((sds011_t *)dev, &data) == SDS011_OK) {
+       res->val[0] = data.pm_2_5;
+       res->val[1] = data.pm_10;
+       res->unit = UNIT_GPM3;
+       res->scale = -7;
+       return 2;
+    }
+    return ECANCELED;
+}
+
+const saul_driver_t sds011_saul_driver = {
+    .read = _read,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_PM
+};

sys/auto_init/auto_init.c

@@ -449,6 +449,10 @@ void auto_init(void)
     extern void auto_init_sht3x(void);
     auto_init_sht3x();
 #endif
+#ifdef MODULE_SDS011
+    extern void auto_init_sds011(void);
+    auto_init_sds011();
+#endif
 #ifdef MODULE_SI114X
     extern void auto_init_si114x(void);
     auto_init_si114x();

sys/auto_init/saul/auto_init_sds011.c

+/*
+ * Copyright (C) 2018 HAW-Hamburg
+ *
+ * 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     sys_auto_init_saul
+ * @{
+ *
+ * @file
+ * @brief       Auto initialization for SDS011 particulate matter sensor
+ *
+ * @author      Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#ifdef MODULE_SDS011
+
+#include "assert.h"
+#include "log.h"
+#include "saul_reg.h"
+#include "sds011.h"
+#include "sds011_params.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define SDS011_NUM     (sizeof(sds011_params) / sizeof(sds011_params[0]))
+
+/**
+ * @brief   Allocate memory for the device descriptors
+ */
+static sds011_t sds011_devs[SDS011_NUM];
+
+/**
+ * @brief   Memory for the SAUL registry entries
+ */
+static saul_reg_t saul_entries[SDS011_NUM];
+
+/**
+ * @brief   Define the number of saul info
+ */
+#define SDS011_INFO_NUM (sizeof(sds011_saul_info) / sizeof(sds011_saul_info[0]))
+
+/**
+ * @name    Import SAUL endpoint
+ * @{
+ */
+extern const saul_driver_t sds011_saul_driver;
+/** @} */
+
+void auto_init_sds011(void)
+{
+    assert(SDS011_INFO_NUM == SDS011_NUM);
+
+    for (unsigned int i = 0; i < SDS011_NUM; i++) {
+        LOG_DEBUG("[auto_init_saul] initializing sds011 #%u\n", i);
+
+        if (sds011_init(&sds011_devs[i], &sds011_params[i]) != SDS011_OK) {
+            LOG_ERROR("[auto_init_saul] error initializing sds011 #%u\n", i);
+            continue;
+        }
+
+        int retries = 0;
+
+        /* sensor must be set to query mode for manual reading by saul */
+        while (sds011_set_reporting_mode(&sds011_devs[i], SDS011_RMODE_QUERY) != SDS011_OK) {
+            if (retries++ >= 3) {
+                LOG_ERROR("[auto_init_saul] error setting sds011 to query mode #%u\n", i);
+                continue;
+            }
+        }
+
+        saul_entries[i].dev = &(sds011_devs[i]);
+        saul_entries[i].name = sds011_saul_info[i].name;
+        saul_entries[i].driver = &sds011_saul_driver;
+        saul_reg_add(&saul_entries[i]);
+    }
+}
+
+#else
+typedef int dont_be_pedantic;
+#endif /* MODULE_SDS011 */