zephyr: Refactor device lookup into a common helper function.

Refactors Zephyr device lookup operations into a common helper function
to reduce boilerplate code that was repeated in multiple modules.

Suggested-by: Damien George <damien@micropython.org>
Signed-off-by: Maureen Helm <maureen.helm@analog.com>

ports/zephyr/CMakeLists.txt

@@ -46,6 +46,7 @@ set(MICROPY_SOURCE_PORT
     modzsensor.c
     mphalport.c
     uart_core.c
+    zephyr_device.c
     zephyr_storage.c
     mpthreadport.c
 )

ports/zephyr/machine_i2c.c

@@ -37,6 +37,7 @@
 #include "py/mphal.h"
 #include "py/mperrno.h"
 #include "extmod/modmachine.h"
+#include "zephyr_device.h"
 
 #if MICROPY_PY_MACHINE_I2C
 
@@ -64,12 +65,7 @@ mp_obj_t machine_hard_i2c_make_new(const mp_obj_type_t *type, size_t n_args, siz
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    const char *dev_name = mp_obj_str_get_str(args[ARG_id].u_obj);
-    const struct device *dev = device_get_binding(dev_name);
-
-    if (dev == NULL) {
-        mp_raise_ValueError(MP_ERROR_TEXT("device not found"));
-    }
+    const struct device *dev = zephyr_device_find(args[ARG_id].u_obj);
 
     if ((args[ARG_scl].u_obj != MP_OBJ_NULL) || (args[ARG_sda].u_obj != MP_OBJ_NULL)) {
         mp_raise_NotImplementedError(MP_ERROR_TEXT("explicit choice of scl/sda is not implemented"));

ports/zephyr/machine_pin.c

@@ -38,6 +38,7 @@
 #include "extmod/modmachine.h"
 #include "shared/runtime/mpirq.h"
 #include "modmachine.h"
+#include "zephyr_device.h"
 
 #if MICROPY_PY_MACHINE
 
@@ -131,12 +132,8 @@ mp_obj_t mp_pin_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw,
     }
     mp_obj_t *items;
     mp_obj_get_array_fixed_n(args[0], 2, &items);
-    const char *drv_name = mp_obj_str_get_str(items[0]);
+    const struct device *wanted_port = zephyr_device_find(items[0]);
     int wanted_pin = mp_obj_get_int(items[1]);
-    const struct device *wanted_port = device_get_binding(drv_name);
-    if (!wanted_port) {
-        mp_raise_ValueError(MP_ERROR_TEXT("invalid port"));
-    }
 
     machine_pin_obj_t *pin = m_new_obj(machine_pin_obj_t);
     pin->base = machine_pin_obj_template;

ports/zephyr/machine_spi.c

@@ -36,6 +36,7 @@
 #include "py/mphal.h"
 #include "py/mperrno.h"
 #include "extmod/modmachine.h"
+#include "zephyr_device.h"
 
 #if MICROPY_PY_MACHINE_SPI
 
@@ -81,12 +82,7 @@ mp_obj_t machine_hard_spi_make_new(const mp_obj_type_t *type, size_t n_args, siz
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    const char *dev_name = mp_obj_str_get_str(args[ARG_id].u_obj);
-    const struct device *dev = device_get_binding(dev_name);
-
-    if (dev == NULL) {
-        mp_raise_ValueError(MP_ERROR_TEXT("device not found"));
-    }
+    const struct device *dev = zephyr_device_find(args[ARG_id].u_obj);
 
     if ((args[ARG_sck].u_obj != MP_OBJ_NULL) || (args[ARG_miso].u_obj != MP_OBJ_NULL) || (args[ARG_mosi].u_obj != MP_OBJ_NULL)) {
         mp_raise_NotImplementedError(MP_ERROR_TEXT("explicit choice of sck/miso/mosi is not implemented"));

ports/zephyr/machine_uart.c

@@ -32,6 +32,7 @@
 #include <zephyr/drivers/uart.h>
 
 #include "py/mperrno.h"
+#include "zephyr_device.h"
 
 // The UART class doesn't have any constants for this port.
 #define MICROPY_PY_MACHINE_UART_CLASS_CONSTANTS
@@ -75,10 +76,7 @@ static mp_obj_t mp_machine_uart_make_new(const mp_obj_type_t *type, size_t n_arg
     mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
 
     machine_uart_obj_t *self = mp_obj_malloc(machine_uart_obj_t, &machine_uart_type);
-    self->dev = device_get_binding(mp_obj_str_get_str(args[0]));
-    if (!self->dev) {
-        mp_raise_ValueError(MP_ERROR_TEXT("Bad device name"));
-    }
+    self->dev = zephyr_device_find(args[0]);
 
     mp_map_t kw_args;
     mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);

ports/zephyr/modzsensor.c

@@ -30,6 +30,7 @@
 
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/sensor.h>
+#include "zephyr_device.h"
 
 #if MICROPY_PY_ZSENSOR
 
@@ -41,10 +42,7 @@ typedef struct _mp_obj_sensor_t {
 static mp_obj_t sensor_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     mp_arg_check_num(n_args, n_kw, 1, 1, false);
     mp_obj_sensor_t *o = mp_obj_malloc(mp_obj_sensor_t, type);
-    o->dev = device_get_binding(mp_obj_str_get_str(args[0]));
-    if (o->dev == NULL) {
-        mp_raise_ValueError(MP_ERROR_TEXT("dev not found"));
-    }
+    o->dev = zephyr_device_find(args[0]);
     return MP_OBJ_FROM_PTR(o);
 }
 

ports/zephyr/zephyr_device.c

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "zephyr_device.h"
+#include "py/runtime.h"
+
+const struct device *zephyr_device_find(mp_obj_t name) {
+    const char *dev_name = mp_obj_str_get_str(name);
+    const struct device *dev = device_get_binding(dev_name);
+
+    if (dev == NULL) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_ValueError(MP_ERROR_TEXT("device not found"));
+        #else
+        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("device %s not found"), dev_name);
+        #endif
+    }
+
+    return dev;
+}

ports/zephyr/zephyr_device.h

@@ -0,0 +1,30 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <zephyr/device.h>
+#include "py/obj.h"
+
+const struct device *zephyr_device_find(mp_obj_t name);