* [PATCH v2 2/2] Input: Add support for Wacom W9000-series penabled touchscreens
2025-12-01 13:31 [PATCH v2 0/2] Add support for Wacom W9000-series penabled touchscreens Hendrik Noack
2025-12-01 13:31 ` [PATCH v2 1/2] dt-bindings: Input: Add " Hendrik Noack
@ 2025-12-01 17:00 ` Hendrik Noack
2025-12-02 10:48 ` kernel test robot
1 sibling, 1 reply; 5+ messages in thread
From: Hendrik Noack @ 2025-12-01 17:00 UTC (permalink / raw)
To: Dmitry Torokhov, Rob Herring, Krzysztof Kozlowski, Conor Dooley
Cc: Hendrik Noack, linux-input, devicetree, linux-kernel
Add driver for two Wacom W9007A variants. These are penabled touchscreens
supporting passive Wacom Pens and use I2C.
Signed-off-by: Hendrik Noack <hendrik-noack@gmx.de>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/wacom_w9000.c | 479 ++++++++++++++++++++++++
3 files changed, 492 insertions(+)
create mode 100644 drivers/input/touchscreen/wacom_w9000.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 7d5b72ee07fa..40f7af0a681a 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -610,6 +610,18 @@ config TOUCHSCREEN_WACOM_I2C
To compile this driver as a module, choose M here: the module
will be called wacom_i2c.
+config TOUCHSCREEN_WACOM_W9000
+ tristate "Wacom W9000-series penabled touchscreen (I2C)"
+ depends on I2C
+ help
+ Say Y here if you have a Wacom W9000-series penabled I2C touchscreen.
+ This driver supports model W9007A.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the module
+ will be called wacom_w9000.
+
config TOUCHSCREEN_LPC32XX
tristate "LPC32XX touchscreen controller"
depends on ARCH_LPC32XX
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index ab9abd151078..aa3915df83b2 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -102,6 +102,7 @@ tsc2007-$(CONFIG_TOUCHSCREEN_TSC2007_IIO) += tsc2007_iio.o
obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
obj-$(CONFIG_TOUCHSCREEN_WACOM_I2C) += wacom_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_WACOM_W9000) += wacom_w9000.o
obj-$(CONFIG_TOUCHSCREEN_WDT87XX_I2C) += wdt87xx_i2c.o
obj-$(CONFIG_TOUCHSCREEN_WM831X) += wm831x-ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
diff --git a/drivers/input/touchscreen/wacom_w9000.c b/drivers/input/touchscreen/wacom_w9000.c
new file mode 100644
index 000000000000..615358db9d03
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_w9000.c
@@ -0,0 +1,479 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Wacom W9000-series penabled I2C touchscreen driver
+ *
+ * Copyright (c) 2025 Hendrik Noack <hendrik-noack@gmx.de>
+ *
+ * Partially based on vendor driver:
+ * Copyright (C) 2012, Samsung Electronics Co. Ltd.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+
+// Message length
+#define COM_COORD_NUM_MAX 12
+#define COM_QUERY_NUM_MAX 9
+
+// Commands
+#define COM_QUERY 0x2a
+
+struct wacom_w9000_variant {
+ int com_coord_num;
+ int com_query_num;
+ char *name;
+};
+
+struct wacom_w9000_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ const struct wacom_w9000_variant *variant;
+ unsigned int fw_version;
+
+ struct touchscreen_properties prop;
+ unsigned int max_pressure;
+
+ struct regulator *regulator;
+
+ struct gpio_desc *flash_mode_gpio;
+ struct gpio_desc *pen_inserted_gpio;
+
+ unsigned int irq;
+ unsigned int pen_insert_irq;
+
+ bool pen_inserted;
+ bool pen_proximity;
+};
+
+static int wacom_w9000_read(struct i2c_client *client, u8 command, int len, char *data)
+{
+ struct i2c_msg xfer[2];
+ bool retried = false;
+ int ret;
+
+ /* Write register */
+ xfer[0].addr = client->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = 1;
+ xfer[0].buf = &command;
+
+ /* Read data */
+ xfer[1].addr = client->addr;
+ xfer[1].flags = I2C_M_RD;
+ xfer[1].len = len;
+ xfer[1].buf = data;
+
+retry:
+ ret = i2c_transfer(client->adapter, xfer, 2);
+ if (ret == 2) {
+ ret = 0;
+ } else if (!retried) {
+ retried = true;
+ goto retry;
+ } else {
+ if (ret >= 0)
+ ret = -EIO;
+ dev_err(&client->dev, "%s: i2c transfer failed (%d)\n", __func__, ret);
+ }
+
+ return ret;
+}
+
+static int wacom_w9000_query(struct wacom_w9000_data *wacom_data)
+{
+ struct i2c_client *client = wacom_data->client;
+ struct device *dev = &wacom_data->client->dev;
+ bool retried = false;
+ int ret;
+ u8 data[COM_QUERY_NUM_MAX];
+
+retry:
+ ret = wacom_w9000_read(client, COM_QUERY, wacom_data->variant->com_query_num, data);
+ if (ret)
+ return ret;
+
+ if (data[0] == 0x0f) {
+ wacom_data->fw_version = get_unaligned_be16(&data[7]);
+ } else if (!retried) {
+ retried = true;
+ goto retry;
+ } else {
+ return -EIO;
+ }
+
+ dev_dbg(dev, "query: %X, %X, %X, %X, %X, %X, %X, %X, %X, %d\n", data[0], data[1], data[2],
+ data[3], data[4], data[5], data[6], data[7], data[8], retried);
+
+ wacom_data->prop.max_x = get_unaligned_be16(&data[1]);
+ wacom_data->prop.max_y = get_unaligned_be16(&data[3]);
+ wacom_data->max_pressure = get_unaligned_be16(&data[5]);
+
+ dev_dbg(dev, "max_x:%d, max_y:%d, max_pressure:%d, fw:0x%X", wacom_data->prop.max_x,
+ wacom_data->prop.max_y, wacom_data->max_pressure,
+ wacom_data->fw_version);
+
+ return 0;
+}
+
+static void wacom_w9000_coord(struct wacom_w9000_data *wacom_data)
+{
+ struct i2c_client *client = wacom_data->client;
+ struct device *dev = &wacom_data->client->dev;
+ int ret;
+ u8 data[COM_COORD_NUM_MAX];
+ bool touch, rubber, side_button;
+ u16 x, y, pressure;
+ u8 distance;
+
+ ret = i2c_master_recv(client, data, wacom_data->variant->com_coord_num);
+ if (ret != wacom_data->variant->com_coord_num) {
+ if (ret >= 0)
+ ret = -EIO;
+ dev_err(dev, "%s: i2c receive failed (%d)\n", __func__, ret);
+ return;
+ }
+
+ dev_dbg(dev, "data: %X, %X, %X, %X, %X, %X, %X, %X, %X, %X, %X, %X", data[0], data[1],
+ data[2], data[3], data[4], data[5], data[6], data[7], data[8], data[9], data[10],
+ data[11]);
+
+ if (data[0] & BIT(7)) {
+ wacom_data->pen_proximity = 1;
+
+ touch = !!(data[0] & BIT(4));
+ side_button = !!(data[0] & BIT(5));
+ rubber = !!(data[0] & BIT(6));
+
+ x = get_unaligned_be16(&data[1]);
+ y = get_unaligned_be16(&data[3]);
+ pressure = get_unaligned_be16(&data[5]);
+ distance = data[7];
+
+ if (!((x <= wacom_data->prop.max_x) && (y <= wacom_data->prop.max_y))) {
+ dev_warn(dev, "Coordinates out of range x=%d, y=%d", x, y);
+ return;
+ }
+
+ touchscreen_report_pos(wacom_data->input_dev, &wacom_data->prop, x, y, false);
+ input_report_abs(wacom_data->input_dev, ABS_PRESSURE, pressure);
+ input_report_abs(wacom_data->input_dev, ABS_DISTANCE, distance);
+ input_report_key(wacom_data->input_dev, BTN_STYLUS, side_button);
+ input_report_key(wacom_data->input_dev, BTN_TOUCH, touch);
+ input_report_key(wacom_data->input_dev, BTN_TOOL_PEN, !rubber);
+ input_report_key(wacom_data->input_dev, BTN_TOOL_RUBBER, rubber);
+ input_sync(wacom_data->input_dev);
+ } else {
+ if (wacom_data->pen_proximity) {
+ input_report_abs(wacom_data->input_dev, ABS_PRESSURE, 0);
+ input_report_abs(wacom_data->input_dev, ABS_DISTANCE, 0);
+ input_report_key(wacom_data->input_dev, BTN_STYLUS, 0);
+ input_report_key(wacom_data->input_dev, BTN_TOUCH, 0);
+ input_report_key(wacom_data->input_dev, BTN_TOOL_PEN, 0);
+ input_report_key(wacom_data->input_dev, BTN_TOOL_RUBBER, 0);
+ input_sync(wacom_data->input_dev);
+
+ wacom_data->pen_proximity = 0;
+ }
+ }
+}
+
+static irqreturn_t wacom_w9000_interrupt(int irq, void *dev_id)
+{
+ struct wacom_w9000_data *wacom_data = dev_id;
+
+ wacom_w9000_coord(wacom_data);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t wacom_w9000_interrupt_pen_insert(int irq, void *dev_id)
+{
+ struct wacom_w9000_data *wacom_data = dev_id;
+ struct device *dev = &wacom_data->client->dev;
+ int ret;
+
+ wacom_data->pen_inserted = gpiod_get_value(wacom_data->pen_inserted_gpio);
+
+ input_report_switch(wacom_data->input_dev, SW_PEN_INSERTED, wacom_data->pen_inserted);
+ input_sync(wacom_data->input_dev);
+
+ if (!wacom_data->pen_inserted && !regulator_is_enabled(wacom_data->regulator)) {
+ ret = regulator_enable(wacom_data->regulator);
+ if (ret) {
+ dev_err(dev, "Failed to enable regulators: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+ msleep(200);
+ enable_irq(wacom_data->irq);
+ } else if (wacom_data->pen_inserted && regulator_is_enabled(wacom_data->regulator)) {
+ disable_irq(wacom_data->irq);
+ regulator_disable(wacom_data->regulator);
+ }
+
+ dev_dbg(dev, "Pen inserted changed to %d", wacom_data->pen_inserted);
+
+ return IRQ_HANDLED;
+}
+
+static int wacom_w9000_open(struct input_dev *dev)
+{
+ struct wacom_w9000_data *wacom_data = input_get_drvdata(dev);
+ int ret;
+
+ if (!wacom_data->pen_inserted && !regulator_is_enabled(wacom_data->regulator)) {
+ ret = regulator_enable(wacom_data->regulator);
+ if (ret) {
+ dev_err(&wacom_data->client->dev, "Failed to enable regulators: %d\n",
+ ret);
+ return ret;
+ }
+ msleep(200);
+ enable_irq(wacom_data->irq);
+ }
+ return 0;
+}
+
+static void wacom_w9000_close(struct input_dev *dev)
+{
+ struct wacom_w9000_data *wacom_data = input_get_drvdata(dev);
+
+ if (regulator_is_enabled(wacom_data->regulator)) {
+ disable_irq(wacom_data->irq);
+ regulator_disable(wacom_data->regulator);
+ }
+}
+
+static int wacom_w9000_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct wacom_w9000_data *wacom_data;
+ struct input_dev *input_dev;
+ int ret;
+ u32 val;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ wacom_data = devm_kzalloc(dev, sizeof(*wacom_data), GFP_KERNEL);
+ if (!wacom_data)
+ return -ENOMEM;
+
+ wacom_data->variant = i2c_get_match_data(client);
+
+ wacom_data->client = client;
+
+ input_dev = devm_input_allocate_device(dev);
+ if (!input_dev)
+ return -ENOMEM;
+ wacom_data->input_dev = input_dev;
+
+ wacom_data->irq = client->irq;
+ i2c_set_clientdata(client, wacom_data);
+
+ wacom_data->regulator = devm_regulator_get(dev, "vdd");
+ if (IS_ERR(wacom_data->regulator))
+ return dev_err_probe(dev, PTR_ERR(wacom_data->regulator),
+ "Failed to get regulators\n");
+
+ wacom_data->flash_mode_gpio = devm_gpiod_get_optional(dev, "flash-mode", GPIOD_OUT_LOW);
+ if (IS_ERR(wacom_data->flash_mode_gpio))
+ return dev_err_probe(dev, PTR_ERR(wacom_data->flash_mode_gpio),
+ "Failed to get flash-mode gpio\n");
+
+ wacom_data->pen_inserted_gpio = devm_gpiod_get_optional(dev, "pen-inserted", GPIOD_IN);
+ if (IS_ERR(wacom_data->pen_inserted_gpio))
+ return dev_err_probe(dev, PTR_ERR(wacom_data->pen_inserted_gpio),
+ "Failed to get pen-insert gpio\n");
+
+ ret = regulator_enable(wacom_data->regulator);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to enable regulators\n");
+
+ msleep(200);
+
+ ret = wacom_w9000_query(wacom_data);
+ if (ret)
+ goto err_disable_regulators;
+
+ input_dev->name = wacom_data->variant->name;
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = dev;
+ input_dev->id.vendor = 0x56a;
+ input_dev->id.version = wacom_data->fw_version;
+ input_dev->open = wacom_w9000_open;
+ input_dev->close = wacom_w9000_close;
+
+ input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
+ input_set_capability(input_dev, EV_KEY, BTN_TOOL_PEN);
+ input_set_capability(input_dev, EV_KEY, BTN_TOOL_RUBBER);
+ input_set_capability(input_dev, EV_KEY, BTN_STYLUS);
+
+ // Calculate x and y resolution from size in devicetree
+ ret = device_property_read_u32(dev, "touchscreen-x-mm", &val);
+ if (ret)
+ input_abs_set_res(input_dev, ABS_X, 100);
+ else
+ input_abs_set_res(input_dev, ABS_X, wacom_data->prop.max_x / val);
+ ret = device_property_read_u32(dev, "touchscreen-y-mm", &val);
+ if (ret)
+ input_abs_set_res(input_dev, ABS_Y, 100);
+ else
+ input_abs_set_res(input_dev, ABS_Y, wacom_data->prop.max_y / val);
+
+ input_set_abs_params(input_dev, ABS_X, 0, wacom_data->prop.max_x, 4, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, wacom_data->prop.max_y, 4, 0);
+ input_set_abs_params(input_dev, ABS_PRESSURE, 0, wacom_data->max_pressure, 0, 0);
+ input_set_abs_params(input_dev, ABS_DISTANCE, 0, 255, 0, 0);
+
+ touchscreen_parse_properties(input_dev, false, &wacom_data->prop);
+
+ ret = devm_request_threaded_irq(dev, wacom_data->irq, NULL, wacom_w9000_interrupt,
+ IRQF_ONESHOT | IRQF_NO_AUTOEN, client->name, wacom_data);
+ if (ret) {
+ dev_err(dev, "Failed to register interrupt\n");
+ goto err_disable_regulators;
+ }
+
+ if (wacom_data->pen_inserted_gpio) {
+ input_set_capability(input_dev, EV_SW, SW_PEN_INSERTED);
+ wacom_data->pen_insert_irq = gpiod_to_irq(wacom_data->pen_inserted_gpio);
+ ret = devm_request_threaded_irq(dev, wacom_data->pen_insert_irq, NULL,
+ wacom_w9000_interrupt_pen_insert, IRQF_ONESHOT |
+ IRQF_NO_AUTOEN | IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING, "wacom_pen_insert",
+ wacom_data);
+ if (ret) {
+ dev_err(dev, "Failed to register pen-insert interrupt\n");
+ goto err_disable_regulators;
+ }
+
+ wacom_data->pen_inserted = gpiod_get_value(wacom_data->pen_inserted_gpio);
+ if (wacom_data->pen_inserted)
+ regulator_disable(wacom_data->regulator);
+ else
+ enable_irq(wacom_data->irq);
+ } else {
+ enable_irq(wacom_data->irq);
+ }
+
+ input_set_drvdata(input_dev, wacom_data);
+
+ input_report_switch(wacom_data->input_dev, SW_PEN_INSERTED, wacom_data->pen_inserted);
+ input_sync(wacom_data->input_dev);
+
+ if (wacom_data->pen_inserted_gpio)
+ enable_irq(wacom_data->pen_insert_irq);
+
+ ret = input_register_device(wacom_data->input_dev);
+ if (ret) {
+ dev_err(dev, "Failed to register input device: %d\n", ret);
+ goto err_disable_regulators;
+ }
+
+ return 0;
+
+err_disable_regulators:
+ regulator_disable(wacom_data->regulator);
+ return ret;
+}
+
+static void wacom_w9000_remove(struct i2c_client *client)
+{
+ struct wacom_w9000_data *wacom_data = i2c_get_clientdata(client);
+
+ if (regulator_is_enabled(wacom_data->regulator))
+ regulator_disable(wacom_data->regulator);
+}
+
+static int wacom_w9000_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wacom_w9000_data *wacom_data = i2c_get_clientdata(client);
+ struct input_dev *input_dev = wacom_data->input_dev;
+
+ mutex_lock(&input_dev->mutex);
+
+ if (regulator_is_enabled(wacom_data->regulator)) {
+ disable_irq(wacom_data->irq);
+ regulator_disable(wacom_data->regulator);
+ }
+
+ mutex_unlock(&input_dev->mutex);
+
+ return 0;
+}
+
+static int wacom_w9000_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wacom_w9000_data *wacom_data = i2c_get_clientdata(client);
+ struct input_dev *input_dev = wacom_data->input_dev;
+ int ret = 0;
+
+ mutex_lock(&input_dev->mutex);
+
+ if (!wacom_data->pen_inserted && !regulator_is_enabled(wacom_data->regulator)) {
+ ret = regulator_enable(wacom_data->regulator);
+ if (ret) {
+ dev_err(&wacom_data->client->dev, "Failed to enable regulators: %d\n",
+ ret);
+ } else {
+ msleep(200);
+ enable_irq(wacom_data->irq);
+ }
+ }
+
+ mutex_unlock(&input_dev->mutex);
+
+ return ret;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(wacom_w9000_pm, wacom_w9000_suspend, wacom_w9000_resume);
+
+static const struct wacom_w9000_variant w9007a_lt03 = {
+ .com_coord_num = 8,
+ .com_query_num = 9,
+ .name = "Wacom W9007 LT03 Digitizer",
+};
+
+static const struct wacom_w9000_variant w9007a_v1 = {
+ .com_coord_num = 12,
+ .com_query_num = 9,
+ .name = "Wacom W9007 V1 Digitizer",
+};
+
+static const struct of_device_id wacom_w9000_of_match[] = {
+ { .compatible = "wacom,w9007a-lt03", .data = &w9007a_lt03, },
+ { .compatible = "wacom,w9007a-v1", .data = &w9007a_v1, },
+ {},
+};
+MODULE_DEVICE_TABLE(of, wacom_w9000_of_match);
+
+static const struct i2c_device_id wacom_w9000_id[] = {
+ { .name = "w9007a-lt03", .driver_data = (kernel_ulong_t)&w9007a_lt03 },
+ { .name = "w9007a-v1", .driver_data = (kernel_ulong_t)&w9007a_v1 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wacom_w9000_id);
+
+static struct i2c_driver wacom_w9000_driver = {
+ .driver = {
+ .name = "wacom_w9000",
+ .of_match_table = wacom_w9000_of_match,
+ .pm = pm_sleep_ptr(&wacom_w9000_pm),
+ },
+ .probe = wacom_w9000_probe,
+ .remove = wacom_w9000_remove,
+ .id_table = wacom_w9000_id,
+};
+module_i2c_driver(wacom_w9000_driver);
+
+/* Module information */
+MODULE_AUTHOR("Hendrik Noack <hendrik-noack@gmx.de>");
+MODULE_DESCRIPTION("Wacom W9000-series penabled touchscreen driver");
+MODULE_LICENSE("GPL");
--
2.43.0
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