drivers/saul: Integrated ltc4150

drivers/ltc4150/include/ltc4150_params.h

@@ -21,6 +21,7 @@
 
 #include "board.h"
 #include "ltc4150.h"
+#include "saul_reg.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -60,6 +61,17 @@ extern "C" {
 #endif
 /**@}*/
 
+/**
+ * @name    Set default SAUL info text for the LTC4150
+ * @{
+ */
+#ifndef LTC4150_SAULINFO
+#define LTC4150_SAULINFO              { .name = "LTC4150 charge" }, \
+                                      { .name = "LTC4150 average current" }
+#endif
+
+/**@}*/
+
 /**
  * @brief   Configure LTC4150 devices
  */
@@ -68,6 +80,14 @@ static const ltc4150_params_t ltc4150_params[] =
     LTC4150_PARAMS
 };
 
+/**
+ * @brief   Allocate and configure entries to the SAUL registry
+ */
+static const saul_reg_info_t ltc4150_saul_info[] =
+{
+    LTC4150_SAULINFO
+};
+
 #ifdef __cplusplus
 }
 #endif

drivers/ltc4150/ltc4150_saul.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2019 Otto-von-Guericke-Universität Magdeburg
+ *
+ * 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_ltc4150
+ * @{
+ *
+ * @file
+ * @brief       SAUL adaption for LTC4150 devices
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ *
+ * @}
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "phydat.h"
+#include "saul.h"
+#include "ltc4150.h"
+
+static int read_charge(const void *_dev, phydat_t *res)
+{
+    ltc4150_dev_t *dev = (ltc4150_dev_t *)_dev;
+    int32_t temp[3];
+
+    if (ltc4150_charge(dev, (uint32_t *)&temp[1], (uint32_t *)&temp[2]) == 0) {
+        res->scale = -3;
+        res->unit = UNIT_COULOMB;
+        temp[0] = temp[2] - temp[1];
+        int dim = (dev->params.polarity != GPIO_UNDEF) ? 3 : 1;
+        phydat_fit(res, temp, (unsigned)dim);
+        return dim;
+    }
+
+    return -ECANCELED;
+}
+
+static int read_current(const void *dev, phydat_t *res)
+{
+    if (ltc4150_avg_current((ltc4150_dev_t *)dev, res->val) == 0) {
+        res->unit = UNIT_A;
+        res->scale = -4;
+        return 1;
+    }
+
+    return -ECANCELED;
+}
+
+const saul_driver_t ltc4150_saul_charge_driver = {
+    .read = read_charge,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_CHARGE
+};
+
+const saul_driver_t ltc4150_saul_current_driver = {
+    .read = read_current,
+    .write = saul_notsup,
+    .type = SAUL_SENSE_CURRENT
+};

sys/auto_init/auto_init.c

@@ -413,6 +413,10 @@ void auto_init(void)
     extern void auto_init_lsm6dsl(void);
     auto_init_lsm6dsl();
 #endif
+#ifdef MODULE_LTC4150
+    extern void auto_init_ltc4150(void);
+    auto_init_ltc4150();
+ #endif
 #ifdef MODULE_MAG3110
     extern void auto_init_mag3110(void);
     auto_init_mag3110();

sys/auto_init/saul/auto_init_ltc4150.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 Otto-von-Guericke-Universität Magdeburg
+ *
+ * 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 LTC4150 coulomb counter
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ *
+ * @}
+ */
+
+#ifdef MODULE_LTC4150
+
+#include "assert.h"
+#include "log.h"
+#include "saul_reg.h"
+#include "ltc4150_params.h"
+#include "ltc4150.h"
+
+/**
+ * @brief   Define the number of configured sensors
+ */
+#define LTC4150_NUM     (sizeof(ltc4150_params) / sizeof(ltc4150_params[0]))
+
+/**
+ * @brief   Allocate memory for the device descriptors
+ */
+static ltc4150_dev_t ltc4150_devs[LTC4150_NUM];
+
+/**
+ * @brief   Memory for the SAUL registry entries
+ */
+static saul_reg_t saul_entries[LTC4150_NUM * 2];
+
+/**
+ * @brief   Define the number of saul info
+ */
+#define LTC4150_INFO_NUM (sizeof(ltc4150_saul_info) / sizeof(ltc4150_saul_info[0]))
+
+/**
+ * @name    Import SAUL endpoints
+ * @{
+ */
+extern const saul_driver_t ltc4150_saul_charge_driver;
+extern const saul_driver_t ltc4150_saul_current_driver;
+/** @} */
+
+void auto_init_ltc4150(void)
+{
+    assert(LTC4150_INFO_NUM == 2 * LTC4150_NUM);
+
+    for (unsigned int i = 0; i < LTC4150_NUM; i++) {
+        LOG_DEBUG("[auto_init_saul] initializing ltc4150 #%u\n", i);
+
+        if (ltc4150_init(&ltc4150_devs[i], &ltc4150_params[i])) {
+            LOG_ERROR("[auto_init_saul] error initializing ltc4150 #%u\n", i);
+            continue;
+        }
+
+        saul_entries[i * 2    ].dev = &(ltc4150_devs[i]);
+        saul_entries[i * 2    ].name = ltc4150_saul_info[2 * i    ].name;
+        saul_entries[i * 2    ].driver = &ltc4150_saul_charge_driver;
+        saul_entries[i * 2 + 1].dev = &(ltc4150_devs[i]);
+        saul_entries[i * 2 + 1].name = ltc4150_saul_info[2 * i + 1].name;
+        saul_entries[i * 2 + 1].driver = &ltc4150_saul_current_driver;
+        saul_reg_add(&(saul_entries[i * 2    ]));
+        saul_reg_add(&(saul_entries[i * 2 + 1]));
+    }
+}
+
+#else
+typedef int dont_be_pedantic;
+#endif /* MODULE_LTC4150 */