Add driver for Maxim Integrated MAX7360 rotary encoder controller,
supporting a single rotary switch.
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
---
drivers/input/misc/Kconfig | 11 +++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/max7360-rotary.c | 185 ++++++++++++++++++++++++++++++++++++
3 files changed, 197 insertions(+)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 6a852c76331b..8430aaf08c04 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -230,6 +230,17 @@ config INPUT_M68K_BEEP
tristate "M68k Beeper support"
depends on M68K
+config INPUT_MAX7360_ROTARY
+ tristate "Maxim MAX7360 Rotary Encoder"
+ depends on I2C
+ depends on MFD_MAX7360
+ help
+ If you say yes here you get support for the rotary encoder on the
+ Maxim MAX7360 I/O Expander.
+
+ To compile this driver as a module, choose M here: the
+ module will be called max7360_rotary.
+
config INPUT_MAX77650_ONKEY
tristate "Maxim MAX77650 ONKEY support"
depends on MFD_MAX77650
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 4f7f736831ba..0ed447543e43 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_INPUT_IQS7222) += iqs7222.o
obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o
obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
+obj-$(CONFIG_INPUT_MAX7360_ROTARY) += max7360-rotary.o
obj-$(CONFIG_INPUT_MAX77650_ONKEY) += max77650-onkey.o
obj-$(CONFIG_INPUT_MAX77693_HAPTIC) += max77693-haptic.o
obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
diff --git a/drivers/input/misc/max7360-rotary.c b/drivers/input/misc/max7360-rotary.c
new file mode 100644
index 000000000000..4639c73a3f9d
--- /dev/null
+++ b/drivers/input/misc/max7360-rotary.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2024 Bootlin
+ *
+ * Author: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max7360.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+struct max7360_rotary {
+ u32 axis;
+ struct input_dev *input;
+ unsigned int debounce_ms;
+ struct regmap *regmap;
+};
+
+static irqreturn_t max7360_rotary_irq(int irq, void *data)
+{
+ struct max7360_rotary *max7360_rotary = data;
+ int val;
+ int ret;
+
+ ret = regmap_read(max7360_rotary->regmap, MAX7360_REG_RTR_CNT, &val);
+ if (ret < 0) {
+ dev_err(&max7360_rotary->input->dev,
+ "Failed to read rotary counter");
+ return IRQ_NONE;
+ }
+
+ if (val == 0) {
+ dev_dbg(&max7360_rotary->input->dev,
+ "Got a spurious interrupt");
+
+ return IRQ_NONE;
+ }
+
+ input_report_rel(max7360_rotary->input, max7360_rotary->axis,
+ (int8_t)val);
+ input_sync(max7360_rotary->input);
+
+ return IRQ_HANDLED;
+}
+
+static int max7360_rotary_hw_init(struct max7360_rotary *max7360_rotary)
+{
+ int val;
+ int ret;
+
+ ret = regmap_write_bits(max7360_rotary->regmap, MAX7360_REG_GPIOCFG,
+ MAX7360_GPIO_CFG_RTR_EN,
+ MAX7360_GPIO_CFG_RTR_EN);
+ if (ret) {
+ dev_err(&max7360_rotary->input->dev,
+ "Failed to enable max7360 rotary encoder");
+ return ret;
+ }
+
+ val = FIELD_PREP(MAX7360_ROT_DEBOUNCE, max7360_rotary->debounce_ms) |
+ FIELD_PREP(MAX7360_ROT_INTCNT, 1) | MAX7360_ROT_INTCNT_DLY;
+ ret = regmap_write(max7360_rotary->regmap, MAX7360_REG_RTRCFG, val);
+ if (ret) {
+ dev_err(&max7360_rotary->input->dev,
+ "Failed to set max7360 rotary encoder configuration");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int max7360_rotary_probe(struct platform_device *pdev)
+{
+ struct max7360_rotary *max7360_rotary;
+ struct input_dev *input;
+ int irq;
+ int ret;
+
+ if (!pdev->dev.parent)
+ return dev_err_probe(&pdev->dev, -ENODEV, "No parent device\n");
+
+ ret = max7360_port_pin_request(pdev->dev.parent, MAX7360_PORT_RTR_PIN,
+ true);
+ if (ret)
+ dev_err_probe(&pdev->dev, ret,
+ "Could not request rotary pin\n");
+
+ irq = platform_get_irq_byname(to_platform_device(pdev->dev.parent),
+ "inti");
+ if (irq < 0)
+ return irq;
+
+ max7360_rotary = devm_kzalloc(&pdev->dev, sizeof(*max7360_rotary),
+ GFP_KERNEL);
+ if (!max7360_rotary)
+ return -ENOMEM;
+
+ max7360_rotary->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!max7360_rotary->regmap)
+ dev_err_probe(&pdev->dev, -ENODEV,
+ "Could not get parent regmap\n");
+
+ device_property_read_u32(pdev->dev.parent, "linux,axis",
+ &max7360_rotary->axis);
+ device_property_read_u32(pdev->dev.parent, "rotary-debounce-delay-ms",
+ &max7360_rotary->debounce_ms);
+ if (max7360_rotary->debounce_ms > MAX7360_ROT_DEBOUNCE_MAX)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "Invalid debounce timing: %u\n",
+ max7360_rotary->debounce_ms);
+
+ input = devm_input_allocate_device(&pdev->dev);
+ if (!input)
+ return dev_err_probe(&pdev->dev, -ENOMEM,
+ "Failed to allocate input device\n");
+
+ max7360_rotary->input = input;
+
+ input->id.bustype = BUS_I2C;
+ input->name = pdev->name;
+ input->dev.parent = &pdev->dev;
+
+ input_set_capability(input, EV_REL, max7360_rotary->axis);
+ input_set_drvdata(input, max7360_rotary);
+
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ max7360_rotary_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
+ "max7360-rotary", max7360_rotary);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "Failed to register interrupt: %d\n", ret);
+
+ ret = input_register_device(input);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "Could not register input device: %d\n",
+ ret);
+
+ platform_set_drvdata(pdev, max7360_rotary);
+
+ device_init_wakeup(&pdev->dev, true);
+ ret = dev_pm_set_wake_irq(&pdev->dev, irq);
+ if (ret)
+ dev_warn(&pdev->dev, "Failed to set up wakeup irq: %d\n", ret);
+
+ ret = max7360_rotary_hw_init(max7360_rotary);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "Failed to initialize max7360 rotary\n");
+
+ return 0;
+}
+
+static void max7360_rotary_remove(struct platform_device *pdev)
+{
+ dev_pm_clear_wake_irq(&pdev->dev);
+
+ /*
+ * Free the MAX7360_PORT_RTR_PIN pin, so it can be requested later by
+ * this driver, the MAX7360 GPIO driver or the MAX7360 PWM driver.
+ */
+ max7360_port_pin_request(pdev->dev.parent, MAX7360_PORT_RTR_PIN, false);
+}
+
+static struct platform_driver max7360_rotary_driver = {
+ .driver = {
+ .name = MAX7360_DRVNAME_ROTARY,
+ },
+ .probe = max7360_rotary_probe,
+ .remove = max7360_rotary_remove,
+};
+module_platform_driver(max7360_rotary_driver);
+
+MODULE_DESCRIPTION("MAX7360 Rotary driver");
+MODULE_AUTHOR("Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>");
+MODULE_ALIAS("platform:" MAX7360_DRVNAME_ROTARY);
+MODULE_LICENSE("GPL");
--
2.39.5
