sys/auto_init: Changes to support SAUL

SAUL read functionality implemented only, as described in
tsl4531x_saul.c.
This driver will work with SAUL in both low and high power modes,
with the startup mode configurable in tsl4531x_params.h.

drivers/tsl4531x/tsl4531x_saul.c

@@ -27,7 +27,7 @@
 static int _read(const void *dev, phydat_t *data)
 {
     memset(data, 0, sizeof(phydat_t));
-    data->val[0] = tsl4531x_simple_read((const tsl4531x_t *)dev);
+    data->val[0] = tsl4531x_simple_read(*(tsl4531x_t * const*)dev);
     data->unit = UNIT_LUX;
     data->scale = 0;
     return 1;

sys/auto_init/auto_init.c

@@ -448,6 +448,10 @@ void auto_init(void)
     extern void auto_init_tsl2561(void);
     auto_init_tsl2561();
 #endif
+#ifdef MODULE_TSL4531X
+    extern void auto_init_tsl4531x(void);
+    auto_init_tsl4531x();
+#endif
 #ifdef MODULE_VCNL40X0
     extern void auto_init_vcnl40x0(void);
     auto_init_vcnl40x0();

sys/auto_init/saul/auto_init_tsl4531x.c

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2016 Inria
+ * 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     sys_auto_init_saul
+ * @{
+ *
+ * @file
+ * @brief       Auto initialization of TSL4531x driver.
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ * @author      Daniel Petry <daniel.petry@fu-berlin.de>
+ *
+ * Adapted from auto_init for the TSL2561 driver.
+ *
+ * @}
+ */
+
+#ifdef MODULE_TSL4531X
+
+#include "log.h"
+#include "saul_reg.h"
+#include "tsl4531x.h"
+#include "tsl4531x_params.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define TSL4531X_NUMOF    (sizeof(tsl4531x_params) / sizeof(tsl4531x_params[0]))
+
+/**
+ * @brief   Allocation of memory for device descriptors
+ */
+static tsl4531x_t tsl4531x_devs[TSL4531X_NUMOF];
+static tsl4531x_t *tsl4531x_devs_p[TSL4531X_NUMOF];
+
+/**
+ * @brief   Memory for the SAUL registry entries
+ */
+static saul_reg_t saul_entries[TSL4531X_NUMOF];
+
+/**
+ * @brief   Define the number of saul info
+ */
+#define TSL4531X_INFO_NUMOF    (sizeof(tsl4531x_saul_info) / sizeof(tsl4531x_saul_info[0]))
+
+/**
+ * @brief   Reference the driver structs.
+ */
+extern const saul_driver_t tsl4531x_saul_driver;
+
+void auto_init_tsl4531x(void)
+{
+    assert(TSL4531X_NUMOF == TSL4531X_INFO_NUMOF);
+
+    for (unsigned i = 0; i < TSL4531X_NUMOF; i++) {
+        printf("[auto_init_saul] initializing tsl4531x #%u\n", i);
+
+        tsl4531x_devs_p[i] = &tsl4531x_devs[i];
+
+        if (tsl4531x_init(&tsl4531x_devs[i],
+                          &tsl4531x_params[i]) != 0) {
+            LOG_ERROR("[auto_init_saul] error initializing tsl4531x #%u\n", i);
+            continue;
+        }
+
+        /* Fill the saul_entries struct */
+        saul_entries[i].dev = &(tsl4531x_devs_p[i]);
+        saul_entries[i].name = tsl4531x_saul_info[i].name;
+        saul_entries[i].driver = &tsl4531x_saul_driver;
+
+        /* register to saul */
+        saul_reg_add(&(saul_entries[i]));
+    }
+}
+#else
+typedef int dont_be_pedantic;
+#endif /* MODULE_TSL4531X */