driver, hts221: add SAUL adaption

drivers/hts221/hts221_saul.c

+/*
+ * Copyright (C) 2017 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_hts221
+ * @{
+ *
+ * @file
+ * @brief       HTS221 adaption to the RIOT SAUL interface
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "saul.h"
+#include "hts221.h"
+
+static int read_temp(const void *dev, phydat_t *res)
+{
+    if (hts221_read_temperature((const hts221_t *)dev, &res->val[0]) != HTS221_OK) {
+        return -ECANCELED;
+    }
+    res->unit = UNIT_TEMP_C;
+    res->scale = -1;
+
+    return 1;
+}
+
+static int read_hum(const void *dev, phydat_t *res)
+{
+    if (hts221_read_humidity((const hts221_t *)dev, (uint16_t *)&res->val[0]) != HTS221_OK) {
+        return -ECANCELED;
+    }
+    res->unit = UNIT_PERCENT;
+    res->scale = -1;
+
+    return 1;
+}
+
+const saul_driver_t hts221_saul_temp_driver = {
+    .read = read_temp,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_TEMP,
+};
+
+const saul_driver_t hts221_saul_hum_driver = {
+    .read = read_hum,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_HUM,
+};

drivers/hts221/include/hts221_params.h

@@ -51,6 +51,10 @@ extern "C" {
                               .avgx = HTS221_PARAM_AVGX, \
                               .rate = HTS221_PARAM_RATE }
 #endif /* HTS221_PARAMS */
+
+#ifndef HTS221_SAULINFO
+#define HTS221_SAULINFO     { .name = "hts221" }
+#endif
 /**@}*/
 
 /**
@@ -61,6 +65,14 @@ static const hts221_params_t hts221_params[] =
     HTS221_PARAMS,
 };
 
+/**
+ * @brief   Additional meta information to keep in the SAUL registry
+ */
+static const saul_reg_info_t hts221_saul_info[] =
+{
+    HTS221_SAULINFO
+};
+
 #ifdef __cplusplus
 }
 #endif

sys/auto_init/auto_init.c

@@ -317,6 +317,10 @@ void auto_init(void)
     extern void auto_init_hdc1000(void);
     auto_init_hdc1000();
 #endif
+#ifdef MODULE_HTS221
+    extern void auto_init_hts221(void);
+    auto_init_hts221();
+#endif
 #ifdef MODULE_DHT
     extern void auto_init_dht(void);
     auto_init_dht();

sys/auto_init/saul/auto_init_hts221.c

+/*
+ * Copyright (C) 2017 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     auto_init_saul
+ * @{
+ *
+ * @file
+ * @brief       Auto initialization for HTS221 devices
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ *
+ * @}
+ */
+
+#ifdef MODULE_HTS221
+
+#include "log.h"
+#include "saul_reg.h"
+#include "hts221.h"
+#include "hts221_params.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define HTS221_NUM      (sizeof(hts221_params)/sizeof(hts221_params[0]))
+
+#define HTS221_SAUL_NUM (sizeof(hts221_saul_info)/sizeof(hts221_saul_info[0]))
+/**
+ * @brief   Allocate memory for the device descriptors
+ */
+static hts221_t hts221_devs[HTS221_NUM];
+
+/**
+ * @brief   Memory for the SAUL registry entries
+ */
+static saul_reg_t saul_entries[HTS221_NUM * 2];
+
+/**
+ * @brief   Reference the driver struct
+ * @{
+ */
+extern saul_driver_t hts221_saul_temp_driver;
+extern saul_driver_t hts221_saul_hum_driver;
+/** @} */
+
+
+void auto_init_hts221(void)
+{
+    assert(HTS221_NUM == HTS221_SAUL_NUM);
+
+    for (unsigned i = 0; i < HTS221_NUM; i++) {
+        LOG_DEBUG("[auto_init_saul] initializing hts221 #%u\n", i);
+
+        hts221_t *dev = &hts221_devs[i];
+        if (hts221_init(dev, &hts221_params[i]) != HTS221_OK) {
+            LOG_ERROR("[auto_init_saul] error initializing hts221 (#%u)\n", i);
+            continue;
+        }
+        if (hts221_power_on(dev) != HTS221_OK) {
+            LOG_ERROR("[auto_init_saul] error set power on (#%u)!\n", i);
+            continue;
+        }
+        if (hts221_set_rate(dev, dev->p.rate) != HTS221_OK) {
+            LOG_ERROR("[auto_init_saul] error set continuous mode (#%u)!\n", i);
+            continue;
+        }
+
+        saul_entries[(i * 2)].dev = &(hts221_devs[i]);
+        saul_entries[(i * 2)].name = hts221_saul_info[i].name;
+        saul_entries[(i * 2)].driver = &hts221_saul_temp_driver;
+        saul_entries[(i * 2) + 1].dev = &(hts221_devs[i]);
+        saul_entries[(i * 2) + 1].name = hts221_saul_info[i].name;
+        saul_entries[(i * 2) + 1].driver = &hts221_saul_hum_driver;
+        saul_reg_add(&(saul_entries[(i * 2)]));
+        saul_reg_add(&(saul_entries[(i * 2) + 1]));
+    }
+}
+
+#else
+typedef int dont_be_pedantic;
+#endif /* MODULE_HTS221 */