drivers/lm75: add SAUL integration

drivers/lm75/lm75_saul.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2021 ML!PA Consulting GmbH
+ *
+ * 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_lm75
+ * @{
+ *
+ * @file
+ * @brief       SAUL adaption for lm75 compatible device
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ *
+ * @}
+ */
+
+#include <string.h>
+
+#include "saul.h"
+#include "lm75.h"
+
+static int read_temperature(const void *dev, phydat_t *res)
+{
+    int temperature;
+
+    lm75_get_temperature((lm75_t *)dev, &temperature);
+    res->val[0] = temperature / 10; /* phydat_t is 16 bit */
+    res->unit = UNIT_TEMP_C;
+    res->scale = -2;
+    return 1;
+}
+
+const saul_driver_t lm75_temperature_saul_driver = {
+    .read = read_temperature,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_TEMP
+};

drivers/saul/init_devs/auto_init_lm75.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2021 ML!PA Consulting GmbH
+ *
+ * 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 lm75 compatible driver.
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ *
+ * @}
+ */
+
+#include "assert.h"
+#include "log.h"
+#include "saul_reg.h"
+#include "lm75.h"
+#include "lm75_params.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define LM75_NUMOF      ARRAY_SIZE(lm75_params)
+
+/**
+ * @brief   Allocation of memory for device descriptors
+ */
+static lm75_t lm75_devs[LM75_NUMOF];
+
+/**
+ * @brief   Memory for the SAUL registry entries
+ */
+static saul_reg_t saul_entries[LM75_NUMOF];
+
+/**
+ * @brief   Reference the driver structs.
+ */
+extern const saul_driver_t lm75_temperature_saul_driver;
+
+void auto_init_lm75(void)
+{
+    for (unsigned i = 0; i < LM75_NUMOF; i++) {
+        LOG_DEBUG("[auto_init_saul] initializing lm75 #%u\n", i);
+
+        if (lm75_init(&lm75_devs[i], &lm75_params[i]) < 0) {
+            LOG_ERROR("[auto_init_saul] error initializing lm75 #%u\n", i);
+            continue;
+        }
+
+        /* temperature */
+        saul_entries[i].dev = &lm75_devs[i];
+        saul_entries[i].name = "lm75";
+        saul_entries[i].driver = &lm75_temperature_saul_driver;
+
+        /* register to saul */
+        saul_reg_add(&(saul_entries[i]));
+    }
+}

drivers/saul/init_devs/init.c

@@ -167,6 +167,10 @@ void saul_init_devs(void)
         extern void auto_init_lis3mdl(void);
         auto_init_lis3mdl();
     }
+    if (IS_USED(MODULE_LM75)) {
+        extern void auto_init_lm75(void);
+        auto_init_lm75();
+    }
     if (IS_USED(MODULE_LPSXXX)) {
         extern void auto_init_lpsxxx(void);
         auto_init_lpsxxx();