Add .spi accessor to SPIDevice

Fixes #4108

3 files changed, 40 insertions, 4 deletions

diff --git a/shared-bindings/adafruit_bus_device/SPIDevice.c b/shared-bindings/adafruit_bus_device/SPIDevice.c
index e127e39b8..e37f88368 100644
--- a/shared-bindings/adafruit_bus_device/SPIDevice.c
+++ b/shared-bindings/adafruit_bus_device/SPIDevice.c
@@ -34,6 +34,7 @@
 
 #include "lib/utils/buffer_helper.h"
 #include "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
 #include "py/runtime.h"
 #include "supervisor/shared/translate.h"
 
@@ -100,22 +101,51 @@ STATIC mp_obj_t adafruit_bus_device_spidevice_make_new(const mp_obj_type_t *type
     return (mp_obj_t)self;
 }
 
+//|     def __enter__(self) -> busio.SPI:
+//|         """Starts a SPI transaction by configuring the SPI and asserting chip select."""
+//|         ...
+//|
 STATIC mp_obj_t adafruit_bus_device_spidevice_obj___enter__(mp_obj_t self_in) {
     adafruit_bus_device_spidevice_obj_t *self = MP_OBJ_TO_PTR(self_in);
-    common_hal_adafruit_bus_device_spidevice_enter(self);
-    return self->spi;
+    return common_hal_adafruit_bus_device_spidevice_enter(self);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(adafruit_bus_device_spidevice___enter___obj, adafruit_bus_device_spidevice_obj___enter__);
 
+
+//|     def __exit__(self) -> None:
+//|         """Ends a SPI transaction by deasserting chip select. See
+//|         :ref:`lifetime-and-contextmanagers` for more info."""
+//|         ...
+//|
 STATIC mp_obj_t adafruit_bus_device_spidevice_obj___exit__(size_t n_args, const mp_obj_t *args) {
     common_hal_adafruit_bus_device_spidevice_exit(MP_OBJ_TO_PTR(args[0]));
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(adafruit_bus_device_spidevice___exit___obj, 4, 4, adafruit_bus_device_spidevice_obj___exit__);
 
+//|     spi: busio.SPI
+//|     """The underlying SPI bus. Useful for weird uses like clocking an SD card without chip select.
+//|
+//|        You shouldn't normally need this."""
+//|
+STATIC mp_obj_t adafruit_bus_device_spidevice_obj_get_spi(mp_obj_t self_in) {
+    adafruit_bus_device_spidevice_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    return common_hal_adafruit_bus_device_spidevice_get_spi(self);
+}
+MP_DEFINE_CONST_FUN_OBJ_1(adafruit_bus_device_spidevice_get_spi_obj, adafruit_bus_device_spidevice_obj_get_spi);
+
+const mp_obj_property_t adafruit_bus_device_spidevice_spi_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&adafruit_bus_device_spidevice_get_spi_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
 STATIC const mp_rom_map_elem_t adafruit_bus_device_spidevice_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&adafruit_bus_device_spidevice___enter___obj) },
     { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&adafruit_bus_device_spidevice___exit___obj) },
+
+    { MP_ROM_QSTR(MP_QSTR_spi), MP_ROM_PTR(&adafruit_bus_device_spidevice_spi_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(adafruit_bus_device_spidevice_locals_dict, adafruit_bus_device_spidevice_locals_dict_table);
diff --git a/shared-bindings/adafruit_bus_device/SPIDevice.h b/shared-bindings/adafruit_bus_device/SPIDevice.h
index 5596b157f..baa9ec464 100644
--- a/shared-bindings/adafruit_bus_device/SPIDevice.h
+++ b/shared-bindings/adafruit_bus_device/SPIDevice.h
@@ -44,7 +44,8 @@ extern const mp_obj_type_t adafruit_bus_device_spidevice_type;
 // Initializes the hardware peripheral.
 extern void common_hal_adafruit_bus_device_spidevice_construct(adafruit_bus_device_spidevice_obj_t *self, busio_spi_obj_t *spi,  digitalio_digitalinout_obj_t *cs,
     uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t extra_clocks);
-extern void common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self);
+extern mp_obj_t common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self);
 extern void common_hal_adafruit_bus_device_spidevice_exit(adafruit_bus_device_spidevice_obj_t *self);
+extern mp_obj_t common_hal_adafruit_bus_device_spidevice_get_spi(adafruit_bus_device_spidevice_obj_t *self);
 
 #endif // MICROPY_INCLUDED_SHARED_BINDINGS_BUSDEVICE_SPIDEVICE_H
diff --git a/shared-module/adafruit_bus_device/SPIDevice.c b/shared-module/adafruit_bus_device/SPIDevice.c
index e489fc7c0..5c1a69b12 100644
--- a/shared-module/adafruit_bus_device/SPIDevice.c
+++ b/shared-module/adafruit_bus_device/SPIDevice.c
@@ -41,7 +41,7 @@ void common_hal_adafruit_bus_device_spidevice_construct(adafruit_bus_device_spid
     self->chip_select = cs;
 }
 
-void common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self) {
+mp_obj_t common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self) {
     bool success = false;
     while (!success) {
         success = common_hal_busio_spi_try_lock(self->spi);
@@ -54,6 +54,7 @@ void common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevic
     if (self->chip_select != MP_OBJ_NULL) {
         common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), false);
     }
+    return self->spi;
 }
 
 void common_hal_adafruit_bus_device_spidevice_exit(adafruit_bus_device_spidevice_obj_t *self) {
@@ -83,3 +84,7 @@ void common_hal_adafruit_bus_device_spidevice_exit(adafruit_bus_device_spidevice
 
     common_hal_busio_spi_unlock(self->spi);
 }
+
+mp_obj_t common_hal_adafruit_bus_device_spidevice_get_spi(adafruit_bus_device_spidevice_obj_t *self) {
+    return self->spi;
+}