[libgpiod v2][PATCH v4 2/4] bindings: python: add examples

[Bartosz Golaszewski <brgl@bgdev.pl>]

This adds the regular set of example programs implemented using libgpiod
python bindings.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
---
 bindings/python/examples/Makefile.am   | 10 +++++++
 bindings/python/examples/gpiodetect.py | 15 +++++++++++
 bindings/python/examples/gpiofind.py   | 20 ++++++++++++++
 bindings/python/examples/gpioget.py    | 29 +++++++++++++++++++++
 bindings/python/examples/gpioinfo.py   | 28 ++++++++++++++++++++
 bindings/python/examples/gpiomon.py    | 26 +++++++++++++++++++
 bindings/python/examples/gpioset.py    | 36 ++++++++++++++++++++++++++
 bindings/python/examples/helpers.py    | 15 +++++++++++
 8 files changed, 179 insertions(+)
 create mode 100644 bindings/python/examples/Makefile.am
 create mode 100755 bindings/python/examples/gpiodetect.py
 create mode 100755 bindings/python/examples/gpiofind.py
 create mode 100755 bindings/python/examples/gpioget.py
 create mode 100755 bindings/python/examples/gpioinfo.py
 create mode 100755 bindings/python/examples/gpiomon.py
 create mode 100755 bindings/python/examples/gpioset.py
 create mode 100644 bindings/python/examples/helpers.py

diff --git a/bindings/python/examples/Makefile.am b/bindings/python/examples/Makefile.am
new file mode 100644
index 0000000..f42b80e
--- /dev/null
+++ b/bindings/python/examples/Makefile.am
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+EXTRA_DIST = \
+	gpiodetect.py \
+	gpiofind.py \
+	gpioget.py \
+	gpioinfo.py \
+	gpiomon.py \
+	gpioset.py
diff --git a/bindings/python/examples/gpiodetect.py b/bindings/python/examples/gpiodetect.py
new file mode 100755
index 0000000..dc98b03
--- /dev/null
+++ b/bindings/python/examples/gpiodetect.py
@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Reimplementation of the gpiodetect tool in Python."""
+
+import gpiod
+import os
+
+from helpers import gpio_chips
+
+if __name__ == "__main__":
+    for chip in gpio_chips():
+        info = chip.get_info()
+        print("{} [{}] ({} lines)".format(info.name, info.label, info.num_lines))
diff --git a/bindings/python/examples/gpiofind.py b/bindings/python/examples/gpiofind.py
new file mode 100755
index 0000000..d41660d
--- /dev/null
+++ b/bindings/python/examples/gpiofind.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Reimplementation of the gpiofind tool in Python."""
+
+import gpiod
+import os
+import sys
+
+if __name__ == "__main__":
+    for entry in os.scandir("/dev/"):
+        if gpiod.is_gpiochip_device(entry.path):
+            with gpiod.Chip(entry.path) as chip:
+                offset = chip.line_offset_from_id(sys.argv[1])
+                if offset is not None:
+                    print("{} {}".format(chip.get_info().name, offset))
+                    sys.exit(0)
+
+    sys.exit(1)
diff --git a/bindings/python/examples/gpioget.py b/bindings/python/examples/gpioget.py
new file mode 100755
index 0000000..bf7e0a6
--- /dev/null
+++ b/bindings/python/examples/gpioget.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Simplified reimplementation of the gpioget tool in Python."""
+
+import gpiod
+import sys
+
+from gpiod.line import Direction
+
+if __name__ == "__main__":
+    if len(sys.argv) < 3:
+        raise TypeError("usage: gpioget.py <gpiochip> <offset1> <offset2> ...")
+
+    path = sys.argv[1]
+    lines = [int(line) if line.isdigit() else line for line in sys.argv[2:]]
+
+    request = gpiod.request_lines(
+        path,
+        consumer="gpioget.py",
+        config={tuple(lines): gpiod.LineSettings(direction=Direction.INPUT)},
+    )
+
+    vals = request.get_values()
+
+    for val in vals:
+        print("{} ".format(val.value), end="")
+    print()
diff --git a/bindings/python/examples/gpioinfo.py b/bindings/python/examples/gpioinfo.py
new file mode 100755
index 0000000..3996dcf
--- /dev/null
+++ b/bindings/python/examples/gpioinfo.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Simplified reimplementation of the gpioinfo tool in Python."""
+
+import gpiod
+import os
+
+from helpers import gpio_chips
+
+if __name__ == "__main__":
+    for chip in gpio_chips():
+        cinfo = chip.get_info()
+        print("{} - {} lines:".format(cinfo.name, cinfo.num_lines))
+
+        for offset in range(0, cinfo.num_lines):
+            linfo = chip.get_line_info(offset)
+            is_input = linfo.direction == gpiod.line.Direction.INPUT
+            print(
+                "\tline {:>3}: {:>18} {:>12} {:>8} {:>10}".format(
+                    linfo.offset,
+                    linfo.name or "unnamed",
+                    linfo.consumer or "unused",
+                    "input" if is_input else "output",
+                    "active-low" if linfo.active_low else "active-high",
+                )
+            )
diff --git a/bindings/python/examples/gpiomon.py b/bindings/python/examples/gpiomon.py
new file mode 100755
index 0000000..58d47a5
--- /dev/null
+++ b/bindings/python/examples/gpiomon.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Simplified reimplementation of the gpiomon tool in Python."""
+
+import gpiod
+import sys
+
+from gpiod.line import Edge
+
+if __name__ == "__main__":
+    if len(sys.argv) < 3:
+        raise TypeError("usage: gpiomon.py <gpiochip> <offset1> <offset2> ...")
+
+    path = sys.argv[1]
+    lines = [int(line) if line.isdigit() else line for line in sys.argv[2:]]
+
+    with gpiod.request_lines(
+        path,
+        consumer="gpiomon.py",
+        config={tuple(lines): gpiod.LineSettings(edge_detection=Edge.BOTH)},
+    ) as request:
+        while True:
+            for event in request.read_edge_event():
+                print(event)
diff --git a/bindings/python/examples/gpioset.py b/bindings/python/examples/gpioset.py
new file mode 100755
index 0000000..372a9a8
--- /dev/null
+++ b/bindings/python/examples/gpioset.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+"""Simplified reimplementation of the gpioset tool in Python."""
+
+import gpiod
+import sys
+
+from gpiod.line import Direction, Value
+
+if __name__ == "__main__":
+    if len(sys.argv) < 3:
+        raise TypeError(
+            "usage: gpioset.py <gpiochip> <offset1>=<value1> <offset2>=<value2> ..."
+        )
+
+    path = sys.argv[1]
+
+    def parse_value(arg):
+        x, y = arg.split("=")
+        return (x, Value(int(y)))
+
+    lvs = [parse_value(arg) for arg in sys.argv[2:]]
+    lines = [x[0] for x in lvs]
+    values = dict(lvs)
+
+    request = gpiod.request_lines(
+        path,
+        consumer="gpioset.py",
+        config={tuple(lines): gpiod.LineSettings(direction=Direction.OUTPUT)},
+    )
+
+    vals = request.set_values(values)
+
+    input()
diff --git a/bindings/python/examples/helpers.py b/bindings/python/examples/helpers.py
new file mode 100644
index 0000000..8b91173
--- /dev/null
+++ b/bindings/python/examples/helpers.py
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
+
+import gpiod
+import os
+
+
+def gpio_chips():
+    for path in [
+        entry.path
+        for entry in os.scandir("/dev/")
+        if gpiod.is_gpiochip_device(entry.path)
+    ]:
+        with gpiod.Chip(path) as chip:
+            yield chip
-- 
2.34.1