new file mode 100644
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2021 Oleh Kravchenko
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/input/qwiic-joystick.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: SparkFun Qwiic Joystick
+
+maintainers:
+ - Oleh Kravchenko <oleg@kaa.org.ua>
+
+description: |
+ Bindings for SparkFun Qwiic Joystick (COM-15168).
+ https://www.sparkfun.com/products/15168
+
+properties:
+ compatible:
+ const: sparkfun,qwiic-joystick
+
+required:
+ - compatible
+
+additionalProperties: false
+
+examples:
+ - |
+ qwiic@20 {
+ compatible = "sparkfun,qwiic-joystick";
+ reg = <0x20>;
+ };
@@ -1060,6 +1060,8 @@ patternProperties:
description: Sony Corporation
"^spansion,.*":
description: Spansion Inc.
+ "^sparkfun,.*":
+ description: SparkFun Electronics
"^sprd,.*":
description: Spreadtrum Communications Inc.
"^sst,.*":
@@ -372,6 +372,15 @@ config JOYSTICK_PXRC
To compile this driver as a module, choose M here: the
module will be called pxrc.
+config JOYSTICK_QWIIC
+ tristate "SparkFun Qwiic Joystick"
+ depends on I2C
+ help
+ Say Y here if you want to use the SparkFun Qwiic Joystick.
+
+ To compile this driver as a module, choose M here: the
+ module will be called qwiic-joystick.
+
config JOYSTICK_FSIA6B
tristate "FlySky FS-iA6B RC Receiver"
select SERIO
@@ -27,6 +27,7 @@ obj-$(CONFIG_JOYSTICK_MAPLE) += maplecontrol.o
obj-$(CONFIG_JOYSTICK_N64) += n64joy.o
obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o
obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o
+obj-$(CONFIG_JOYSTICK_QWIIC) += qwiic-joystick.o
obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o
obj-$(CONFIG_JOYSTICK_SPACEBALL) += spaceball.o
obj-$(CONFIG_JOYSTICK_SPACEORB) += spaceorb.o
new file mode 100644
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2021 Oleh Kravchenko <oleg@kaa.org.ua>
+
+/*
+ * SparkFun Qwiic Joystick
+ * Product page:https://www.sparkfun.com/products/15168
+ * Firmware and hardware sources:https://github.com/sparkfun/Qwiic_Joystick
+ */
+
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/module.h>
+
+#define QWIIC_JSK_REG_VERS 0
+#define QWIIC_JSK_REG_DATA 3
+
+#define QWIIC_JSK_MAX_AXIS GENMASK(10, 0)
+#define QWIIC_JSK_FUZZ 2
+#define QWIIC_JSK_FLAT 2
+
+struct qwiic_jsk {
+ char phys[32];
+ struct input_dev *dev;
+ struct i2c_client *i2c;
+};
+
+struct qwiic_ver {
+ u8 addr;
+ u8 major;
+ u8 minor;
+} __packed;
+
+struct qwiic_data {
+ u8 hx;
+ u8 lx;
+ u8 hy;
+ u8 ly;
+ u8 thumb;
+} __packed;
+
+static void qwiic_poll(struct input_dev *input)
+{
+ struct qwiic_jsk *priv;
+ struct qwiic_data data;
+ int ret;
+ int x, y, btn;
+
+ priv = input_get_drvdata(input);
+
+ ret = i2c_smbus_read_i2c_block_data(priv->i2c, QWIIC_JSK_REG_DATA,
+ sizeof(data), (u8 *)&data);
+ if (ret == sizeof(data)) {
+ x = (data.hx << 8 | data.lx) >> 6;
+ y = (data.hy << 8 | data.ly) >> 6;
+ btn = !!!data.thumb;
+
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+ input_report_key(input, BTN_THUMBL, btn);
+
+ input_sync(input);
+ }
+}
+
+static int qwiic_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
+{
+ struct qwiic_jsk *priv;
+ struct qwiic_ver vers;
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(i2c, QWIIC_JSK_REG_VERS,
+ sizeof(vers), (u8 *)&vers);
+ if (ret != sizeof(vers)) {
+ ret = -EIO;
+ goto err;
+ }
+
+ if (i2c->addr != vers.addr) {
+ dev_err(&i2c->dev, "address doesn't match!\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ dev_info(&i2c->dev, "SparkFun Qwiic Joystick, FW: %d.%d\n",
+ vers.major, vers.minor);
+
+ priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ priv->i2c = i2c;
+ snprintf(priv->phys, sizeof(priv->phys), "i2c/%s", dev_name(&i2c->dev));
+ i2c_set_clientdata(i2c, priv);
+
+ priv->dev = devm_input_allocate_device(&i2c->dev);
+ if (!priv->dev) {
+ dev_err(&i2c->dev, "failed to allocate input device\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ priv->dev->dev.parent = &i2c->dev;
+ priv->dev->id.bustype = BUS_I2C;
+ priv->dev->name = "SparkFun Qwiic Joystick";
+ priv->dev->phys = priv->phys;
+ input_set_drvdata(priv->dev, priv);
+
+ input_set_abs_params(priv->dev, ABS_X, 0, QWIIC_JSK_MAX_AXIS,
+ QWIIC_JSK_FUZZ, QWIIC_JSK_FLAT);
+ input_set_abs_params(priv->dev, ABS_Y, 0, QWIIC_JSK_MAX_AXIS,
+ QWIIC_JSK_FUZZ, QWIIC_JSK_FLAT);
+ input_set_capability(priv->dev, EV_KEY, BTN_THUMBL);
+
+ ret = input_setup_polling(priv->dev, qwiic_poll);
+ if (ret) {
+ dev_err(&i2c->dev, "failed to set up polling: %d\n", ret);
+ goto err;
+ }
+ input_set_poll_interval(priv->dev, 16);
+ input_set_min_poll_interval(priv->dev, 8);
+ input_set_max_poll_interval(priv->dev, 32);
+
+ ret = input_register_device(priv->dev);
+ if (ret)
+ dev_err(&i2c->dev, "failed to register joystick: %d\n", ret);
+
+err:
+ return ret;
+}
+
+static int qwiic_remove(struct i2c_client *i2c)
+{
+ struct qwiic_jsk *priv;
+
+ priv = i2c_get_clientdata(i2c);
+ input_unregister_device(priv->dev);
+
+ return 0;
+}
+
+static const struct of_device_id of_qwiic_match[] = {
+ { .compatible = "sparkfun,qwiic-joystick", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_qwiic_match);
+
+static const struct i2c_device_id qwiic_id_table[] = {
+ { KBUILD_MODNAME, 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, qwiic_id_table);
+
+static struct i2c_driver qwiic_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = of_match_ptr(of_qwiic_match),
+ },
+ .id_table = qwiic_id_table,
+ .probe = qwiic_probe,
+ .remove = qwiic_remove,
+};
+module_i2c_driver(qwiic_driver);
+
+MODULE_AUTHOR("Oleh Kravchenko <oleg@kaa.org.ua>");
+MODULE_DESCRIPTION("SparkFun Qwiic Joystick driver");
+MODULE_LICENSE("GPL v2");
A simple analog joystick built on Low Power ATtiny85 Microcontroller. Directional movements are measured with two 10 kΩ potentiometers connected with a gimbal mechanism that separates the horizontal and vertical movements. This joystick also has a select button that is actuated when the joystick is pressed down. Input events polled over the I2C bus. Product page: https://www.sparkfun.com/products/15168 Firmware and hardware sources: https://github.com/sparkfun/Qwiic_Joystick Tested on RPi4B and O4-iMX-NANO boards. Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Device Tree mailing list <devicetree@vger.kernel.org> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Jiri Kosina <jikos@jikos.cz> Cc: Patchwork Bot <patchwork-bot@kernel.org> Signed-off-by: Oleh Kravchenko <oleg@kaa.org.ua> --- .../bindings/input/qwiic-joystick.yaml | 31 ++++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + drivers/input/joystick/Kconfig | 9 + drivers/input/joystick/Makefile | 1 + drivers/input/joystick/qwiic-joystick.c | 170 ++++++++++++++++++ 5 files changed, 213 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/qwiic-joystick.yaml create mode 100644 drivers/input/joystick/qwiic-joystick.c