Merge pull request #677 from Gerriko/patch-1

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / amlogic / meson_g12_common / pin.py

diff --git a/src/adafruit_blinka/microcontroller/amlogic/meson_g12_common/pin.py b/src/adafruit_blinka/microcontroller/amlogic/meson_g12_common/pin.py
index a6a9be1c6ed5ed3543cd1929153a3d31a273402c..87f45719ac1918e5e98c40bc23cff1b71e97c931 100644 (file)
--- a/src/adafruit_blinka/microcontroller/amlogic/meson_g12_common/pin.py
+++ b/src/adafruit_blinka/microcontroller/amlogic/meson_g12_common/pin.py
@@ -1,27 +1,47 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""
+G12A, G12B, and SM1 Common Definitions
+Ref:
+Linux kernel 4.9.y (hardkernel)
+    linux/include/dt-bindings/gpio/meson-g12a-gpio.h
+Linux kernel 5.4.y (mainline)
+    linux/include/dt-bindings/gpio/meson-g12a-gpio.h
+    linux/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+"""
+
+from typing import Optional
+import os
+import re
+
+try:
+    import gpiod
+except ImportError:
+    raise ImportError(
+        "libgpiod Python bindings not found, please install and try again!"
+    ) from ImportError
 from adafruit_blinka.microcontroller.generic_linux.libgpiod_pin import Pin
-import gpiod
 
-# G12A, G12B, and SM1
-# Ref:
-# Linux kernel 4.9.y (hardkernel)
-#     linux/include/dt-bindings/gpio/meson-g12a-gpio.h
-# Linux kernel 5.4.y (mainline)
-#     linux/include/dt-bindings/gpio/meson-g12a-gpio.h
+if hasattr(gpiod, "Chip"):
+    chip0 = gpiod.Chip("0")
+    chip1 = gpiod.Chip("1")
+else:
+    chip0 = gpiod.chip("0")
+    chip1 = gpiod.chip("1")
 
-chip0 = gpiod.Chip("0")
-chip1 = gpiod.Chip("1")
 
-if chip0.num_lines() < 20:
+if chip0.num_lines < 20:
     aobus = 0
     periphs = 1
-    periphs_offset = chip1.num_lines() - 85
+    periphs_offset = chip1.num_lines - 85
 else:
     aobus = 1
     periphs = 0
-    periphs_offset = chip0.num_lines() - 85
+    periphs_offset = chip0.num_lines - 85
 
-chip0.close()
-chip1.close()
+del chip0
+del chip1
 
 GPIOAO_0 = GPIO496 = Pin((aobus, 0))
 GPIOAO_1 = GPIO497 = Pin((aobus, 1))
@@ -87,3 +107,49 @@ GPIOX_16 = GPIO492 = Pin((periphs, 81 + periphs_offset))
 GPIOX_17 = GPIO493 = Pin((periphs, 82 + periphs_offset))
 GPIOX_18 = GPIO494 = Pin((periphs, 83 + periphs_offset))
 GPIOX_19 = GPIO495 = Pin((periphs, 84 + periphs_offset))
+
+SPI0_SCLK = GPIOX_11
+SPI0_MISO = GPIOX_9
+SPI0_MOSI = GPIOX_8
+SPI0_CS0 = GPIOX_10
+
+# ordered as spiId, sckId, mosiId, misoId
+spiPorts = ((0, SPI0_SCLK, SPI0_MOSI, SPI0_MISO),)
+
+UART1_TX = GPIOX_12
+UART1_RX = GPIOX_13
+
+# ordered as uartId, txId, rxId
+uartPorts = ((1, UART1_TX, UART1_RX),)
+
+
+def get_dts_alias(device: str) -> Optional[str]:
+    """Get the Device Tree Alias"""
+    uevent_path = "/sys/bus/platform/devices/" + device + "/uevent"
+    if os.path.exists(uevent_path):
+        with open(uevent_path, "r", encoding="utf-8") as fd:
+            pattern = r"^OF_ALIAS_0=(.*)$"
+            uevent = fd.read().split("\n")
+            for line in uevent:
+                match = re.search(pattern, line)
+                if match:
+                    return match.group(1).upper()
+    return None
+
+
+# ordered as i2cId, sclId, sdaId
+i2cPorts = []
+
+alias = get_dts_alias("ffd1d000.i2c")
+if alias is not None:
+    globals()[alias + "_SCL"] = GPIOX_18
+    globals()[alias + "_SDA"] = GPIOX_17
+    i2cPorts.append((int(alias[3]), GPIOX_18, GPIOX_17))
+
+alias = get_dts_alias("ffd1c000.i2c")
+if alias is not None:
+    globals()[alias + "_SCL"] = GPIOA_15
+    globals()[alias + "_SDA"] = GPIOA_14
+    i2cPorts.append((int(alias[3]), GPIOA_15, GPIOA_14))
+
+i2cPorts = tuple(i2cPorts)