6 files changed, 347 insertions, 0 deletions

diff --git a/drivers/input/rmi4/Kconfig b/drivers/input/rmi4/Kconfig
index c0163b983ce6..5db58fc9e11b 100644
--- a/drivers/input/rmi4/Kconfig
+++ b/drivers/input/rmi4/Kconfig
@@ -82,6 +82,21 @@ config RMI4_F12
 	  touchpads. For sensors that support relative pointing, F12 also
 	  provides mouse input.
 
+config RMI4_F1A
+	bool "RMI4 Function 1A (0D pointing)"
+	help
+	  Say Y here if you want to add support for RMI4 function 1A.
+
+	  Function 1A provides capacitive keys support for RMI4 devices.
+
+config RMI4_F21
+	bool "RMI4 Function 21 (PRESSURE)"
+	help
+	  Say Y here if you want to add support for RMI4 function 21.
+
+	  Function 21 provides buttons/pressure handling for RMI4 devices.
+	  This includes support for buttons/pressure on PressurePad.
+
 config RMI4_F30
 	bool "RMI4 Function 30 (GPIO LED)"
 	help
diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile
index 02f14c846861..35ae29f72497 100644
--- a/drivers/input/rmi4/Makefile
+++ b/drivers/input/rmi4/Makefile
@@ -8,6 +8,8 @@ rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o
 rmi_core-$(CONFIG_RMI4_F03) += rmi_f03.o
 rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o
 rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o
+rmi_core-$(CONFIG_RMI4_F1A) += rmi_f1a.o
+rmi_core-$(CONFIG_RMI4_F21) += rmi_f21.o
 rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o
 rmi_core-$(CONFIG_RMI4_F34) += rmi_f34.o rmi_f34v7.o
 rmi_core-$(CONFIG_RMI4_F3A) += rmi_f3a.o
diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c
index 3aee04837205..5f98c3bcfd46 100644
--- a/drivers/input/rmi4/rmi_bus.c
+++ b/drivers/input/rmi4/rmi_bus.c
@@ -360,6 +360,12 @@ static struct rmi_function_handler *fn_handlers[] = {
 #ifdef CONFIG_RMI4_F12
 	&rmi_f12_handler,
 #endif
+#ifdef CONFIG_RMI4_F1A
+	&rmi_f1a_handler,
+#endif
+#ifdef CONFIG_RMI4_F21
+	&rmi_f21_handler,
+#endif
 #ifdef CONFIG_RMI4_F30
 	&rmi_f30_handler,
 #endif
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index 3bfe9013043e..e84495caab15 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -133,6 +133,8 @@ extern struct rmi_function_handler rmi_f01_handler;
 extern struct rmi_function_handler rmi_f03_handler;
 extern struct rmi_function_handler rmi_f11_handler;
 extern struct rmi_function_handler rmi_f12_handler;
+extern struct rmi_function_handler rmi_f1a_handler;
+extern struct rmi_function_handler rmi_f21_handler;
 extern struct rmi_function_handler rmi_f30_handler;
 extern struct rmi_function_handler rmi_f34_handler;
 extern struct rmi_function_handler rmi_f3a_handler;
diff --git a/drivers/input/rmi4/rmi_f1a.c b/drivers/input/rmi4/rmi_f1a.c
new file mode 100644
index 000000000000..765e9eae4cdc
--- /dev/null
+++ b/drivers/input/rmi4/rmi_f1a.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 André Apitzsch <git@apitzsch.eu>
+ */
+
+#include <linux/input.h>
+#include <linux/property.h>
+#include "rmi_driver.h"
+
+struct f1a_data {
+	struct input_dev *input;
+
+	u32 *keymap;
+	unsigned int num_keys;
+};
+
+static int rmi_f1a_parse_device_properties(struct rmi_function *fn, struct f1a_data *f1a)
+{
+	static const char buttons_property[] = "linux,keycodes";
+	struct device *dev = &fn->dev;
+	u32 *buttonmap;
+	int n_keys;
+	int error;
+
+	if (!device_property_present(dev, buttons_property))
+		return 0;
+
+	n_keys = device_property_count_u32(dev, buttons_property);
+	if (n_keys <= 0) {
+		error = n_keys < 0 ? n_keys : -EINVAL;
+		dev_err(dev, "Invalid/malformed '%s' property: %d\n",
+			buttons_property, error);
+		return error;
+	}
+
+	buttonmap = devm_kmalloc_array(dev, n_keys, sizeof(*buttonmap),
+				       GFP_KERNEL);
+	if (!buttonmap)
+		return -ENOMEM;
+
+	error = device_property_read_u32_array(dev, buttons_property,
+					       buttonmap, n_keys);
+	if (error) {
+		dev_err(dev, "Failed to parse '%s' property: %d\n",
+			buttons_property, error);
+		return error;
+	}
+
+	f1a->keymap = buttonmap;
+	f1a->num_keys = n_keys;
+
+	return 0;
+}
+
+static irqreturn_t rmi_f1a_attention(int irq, void *ctx)
+{
+	struct rmi_function *fn = ctx;
+	struct f1a_data *f1a = dev_get_drvdata(&fn->dev);
+	char button_bitmask;
+	int key;
+	int error;
+
+	error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr,
+			       &button_bitmask, sizeof(button_bitmask));
+	if (error) {
+		dev_err(&fn->dev, "Failed to read object data. Code: %d.\n",
+			error);
+		return IRQ_RETVAL(error);
+	}
+
+	for (key = 0; key < f1a->num_keys; key++)
+		input_report_key(f1a->input, f1a->keymap[key],
+				 button_bitmask & BIT(key));
+
+	return IRQ_HANDLED;
+}
+
+static int rmi_f1a_config(struct rmi_function *fn)
+{
+	struct f1a_data *f1a = dev_get_drvdata(&fn->dev);
+	struct rmi_driver *drv = fn->rmi_dev->driver;
+
+	if (f1a->num_keys)
+		drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
+
+	return 0;
+}
+
+static int rmi_f1a_initialize(struct rmi_function *fn, struct f1a_data *f1a)
+{
+	int error;
+	int i;
+
+	error = rmi_f1a_parse_device_properties(fn, f1a);
+	if (error)
+		return error;
+
+	for (i = 0; i < f1a->num_keys; i++)
+		input_set_capability(f1a->input, EV_KEY, f1a->keymap[i]);
+
+	f1a->input->keycode = f1a->keymap;
+	f1a->input->keycodemax = f1a->num_keys;
+	f1a->input->keycodesize = sizeof(f1a->keymap[0]);
+
+	return 0;
+}
+
+static int rmi_f1a_probe(struct rmi_function *fn)
+{
+	struct rmi_device *rmi_dev = fn->rmi_dev;
+	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
+	struct f1a_data *f1a;
+	int error;
+
+	if (!drv_data->input) {
+		dev_info(&fn->dev, "F1A: no input device found, ignoring\n");
+		return -ENXIO;
+	}
+
+	f1a = devm_kzalloc(&fn->dev, sizeof(*f1a), GFP_KERNEL);
+	if (!f1a)
+		return -ENOMEM;
+
+	f1a->input = drv_data->input;
+
+	error = rmi_f1a_initialize(fn, f1a);
+	if (error)
+		return error;
+
+	dev_set_drvdata(&fn->dev, f1a);
+
+	return 0;
+}
+
+struct rmi_function_handler rmi_f1a_handler = {
+	.driver = {
+		.name = "rmi4_f1a",
+	},
+	.func = 0x1a,
+	.probe = rmi_f1a_probe,
+	.config = rmi_f1a_config,
+	.attention = rmi_f1a_attention,
+};
diff --git a/drivers/input/rmi4/rmi_f21.c b/drivers/input/rmi4/rmi_f21.c
new file mode 100644
index 000000000000..e3a9dfc3f0ec
--- /dev/null
+++ b/drivers/input/rmi4/rmi_f21.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012-2025 Synaptics Incorporated
+ */
+
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/kernel.h>
+#include <linux/rmi.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include "rmi_driver.h"
+
+#define RMI_F21_SENSOR_COUNT_MASK	GENMASK(3, 0)
+#define RMI_F21_FINGER_COUNT_PRESENT	BIT(5)
+#define RMI_F21_NEW_REPORT_FORMAT	BIT(6)
+
+#define RMI_F21_FINGER_COUNT_MASK	GENMASK(3, 0)
+
+#define RMI_F21_MAX_SENSORS		16
+#define RMI_F21_MAX_FINGERS		16
+#define RMI_F21_DATA_REGS_MAX_SIZE	(RMI_F21_MAX_SENSORS * 2 + \
+					 RMI_F21_MAX_FINGERS * 2 + 1)
+
+#define RMI_F21_FORCE_CLICK_BIT		BIT(0)
+
+#define RMI_F21_FORCEPAD_BUTTON_COUNT	1
+
+struct f21_data {
+	struct input_dev *input;
+	u16 key_code;
+
+	unsigned int attn_data_size;
+	unsigned int attn_data_button_offset;
+
+	unsigned int data_reg_size;
+	unsigned int data_reg_button_offset;
+	u8 data_regs[RMI_F21_DATA_REGS_MAX_SIZE];
+};
+
+static irqreturn_t rmi_f21_attention(int irq, void *ctx)
+{
+	struct rmi_function *fn = ctx;
+	struct f21_data *f21 = dev_get_drvdata(&fn->dev);
+	struct rmi_driver_data *drvdata = dev_get_drvdata(&fn->rmi_dev->dev);
+	u8 *pdata;
+	int error;
+	bool pressed;
+
+	if (drvdata->attn_data.data) {
+		if (drvdata->attn_data.size < f21->attn_data_size) {
+			dev_warn(&fn->dev, "f21 interrupt, but data is missing\n");
+			return IRQ_HANDLED;
+		}
+
+		pdata = drvdata->attn_data.data + f21->attn_data_button_offset;
+
+		drvdata->attn_data.data += f21->attn_data_size;
+		drvdata->attn_data.size -= f21->attn_data_size;
+	} else {
+		error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr,
+				       f21->data_regs, f21->data_reg_size);
+		if (error) {
+			dev_err(&fn->dev, "failed to read f21 data registers: %d\n",
+				error);
+			return IRQ_RETVAL(error);
+		}
+
+		pdata = f21->data_regs + f21->data_reg_button_offset;
+	}
+
+	pressed = *pdata & RMI_F21_FORCE_CLICK_BIT;
+	input_report_key(f21->input, f21->key_code, pressed);
+
+	return IRQ_HANDLED;
+}
+
+static int rmi_f21_config(struct rmi_function *fn)
+{
+	struct rmi_driver *drv = fn->rmi_dev->driver;
+
+	drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
+
+	return 0;
+}
+
+static int rmi_f21_initialize(struct rmi_function *fn, struct f21_data *f21)
+{
+	struct input_dev *input = f21->input;
+
+	f21->key_code = BTN_LEFT;
+
+	input->keycode = &f21->key_code;
+	input->keycodesize = sizeof(f21->key_code);
+	input->keycodemax = RMI_F21_FORCEPAD_BUTTON_COUNT;
+
+	input_set_capability(input, EV_KEY, f21->key_code);
+	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+
+	return 0;
+}
+
+static int rmi_f21_probe(struct rmi_function *fn)
+{
+	struct rmi_device *rmi_dev = fn->rmi_dev;
+	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
+	struct f21_data *f21;
+	unsigned int sensor_count;
+	unsigned int max_fingers;
+	unsigned int query15_offset;
+	u8 query15_data;
+	int error;
+
+	if (!drv_data->input) {
+		dev_info(&fn->dev, "f21: no input device found, ignoring\n");
+		return -ENXIO;
+	}
+
+	f21 = devm_kzalloc(&fn->dev, sizeof(*f21), GFP_KERNEL);
+	if (!f21)
+		return -ENOMEM;
+
+	f21->input = drv_data->input;
+
+	error = rmi_f21_initialize(fn, f21);
+	if (error)
+		return error;
+
+	dev_set_drvdata(&fn->dev, f21);
+
+	sensor_count = fn->fd.query_base_addr & RMI_F21_SENSOR_COUNT_MASK;
+	if (fn->fd.query_base_addr & RMI_F21_FINGER_COUNT_PRESENT) {
+		query15_offset = fn->fd.query_base_addr & RMI_F21_NEW_REPORT_FORMAT ? 2 : 1;
+		error = rmi_read_block(fn->rmi_dev,
+				       fn->fd.query_base_addr + query15_offset,
+				       &query15_data, sizeof(query15_data));
+		if (error)
+			return dev_err_probe(&fn->dev, error,
+					     "failed to read 'query15' data");
+
+		max_fingers = query15_data & RMI_F21_FINGER_COUNT_MASK;
+	} else {
+		max_fingers = 5;
+	}
+
+	if (fn->fd.query_base_addr & RMI_F21_NEW_REPORT_FORMAT) {
+		/* Each finger uses one byte, and the button state uses one byte.*/
+		f21->attn_data_size = max_fingers + 1;
+		f21->attn_data_button_offset = f21->attn_data_size - 1;
+		/*
+		 * Each sensor uses two bytes, the button state uses one byte,
+		 * and each finger uses two bytes.
+		 */
+		f21->data_reg_size = sensor_count * 2 + 1 + max_fingers * 2;
+		f21->data_reg_button_offset = sensor_count * 2;
+	} else {
+		/*
+		 * Regardless of the transport each finger uses two bytes,
+		 * and the button state uses one byte.
+		 */
+		f21->attn_data_size = sensor_count * 2 + 1;
+		f21->attn_data_button_offset = sensor_count * 2;
+
+		f21->data_reg_size = f21->attn_data_size;
+		f21->data_reg_button_offset = f21->attn_data_button_offset;
+	}
+
+	return 0;
+}
+
+struct rmi_function_handler rmi_f21_handler = {
+	.driver = {
+		.name = "rmi4_f21",
+	},
+	.func = 0x21,
+	.probe = rmi_f21_probe,
+	.config = rmi_f21_config,
+	.attention = rmi_f21_attention,
+};