new file mode 100644
@@ -0,0 +1,18 @@
+* EETI EXC3000 Multiple Touch Controller
+
+Required properties:
+- compatible: must be "eeti,exc3000"
+- reg: i2c slave address
+- interrupt-parent: the phandle for the interrupt controller
+- interrupts: touch controller interrupt
+- irq-gpios: the gpio pin to be used as irq pin
+
+Example:
+
+ exc3000@2a {
+ compatible = "eeti,exc3000";
+ reg = <0x2a>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <9 2>;
+ irq-gpios = <&gpio1 9 0>;
+ };
@@ -316,6 +316,16 @@ config TOUCHSCREEN_EGALAX_SERIAL
To compile this driver as a module, choose M here: the
module will be called egalax_ts_serial.
+config TOUCHSCREEN_EXC3000
+ tristate "EETI EXC3000 multi-touch panel support"
+ depends on I2C
+ help
+ Say Y here to enable support for I2C connected EETI
+ EXC3000 multi-touch panels.
+
+ To compile this driver as a module, choose M here: the
+ module will be called exc3000.
+
config TOUCHSCREEN_FUJITSU
tristate "Fujitsu serial touchscreen"
select SERIO
@@ -37,6 +37,7 @@ obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.o
obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL) += egalax_ts_serial.o
+obj-$(CONFIG_TOUCHSCREEN_EXC3000) += exc3000.o
obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
new file mode 100644
@@ -0,0 +1,152 @@
+/*
+ * Driver for I2C connected EETI EXC3000 multiple touch controller
+ *
+ * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
+ *
+ * minimal implementation based on egalax_ts.c and egalax_i2c.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/input/mt.h>
+#include <asm/unaligned.h>
+
+#define EXC3000_NUM_SLOTS 10
+#define EXC3000_SLOTS_PER_FRAME 5
+#define EXC3000_LEN_FRAME 66
+#define EXC3000_LEN_POINT 10
+#define EXC3000_MT_EVENT 6
+
+struct exc3000_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ u8 buf[2 * EXC3000_LEN_FRAME];
+};
+
+static void exc3000_process(struct input_dev *input, u8 *buf, int num)
+{
+ for (; num--; buf += EXC3000_LEN_POINT) {
+ input_mt_slot(input, buf[1]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, buf[0] & 1);
+ if (buf[0] & 1) {
+ input_report_abs(input, ABS_MT_POSITION_X,
+ get_unaligned_le16(buf + 2));
+ input_report_abs(input, ABS_MT_POSITION_Y,
+ get_unaligned_le16(buf + 4));
+ }
+ }
+}
+
+static int exc3000_read(struct i2c_client *client, u8 *buf)
+{
+ return i2c_master_send(client, "'", 2) != 2 ||
+ i2c_master_recv(client, buf,
+ EXC3000_LEN_FRAME) != EXC3000_LEN_FRAME ||
+ get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
+ buf[2] != EXC3000_MT_EVENT;
+}
+
+static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
+{
+ struct exc3000_data *data = dev_id;
+ struct i2c_client *client = data->client;
+ struct input_dev *input = data->input;
+ u8 *buf = data->buf;
+
+ if (exc3000_read(client, buf) || !buf[3] || buf[3] > EXC3000_NUM_SLOTS)
+ return IRQ_HANDLED;
+ if (buf[3] <= EXC3000_SLOTS_PER_FRAME) {
+ exc3000_process(input, buf + 4, buf[3]);
+ } else {
+ if (exc3000_read(client, buf + EXC3000_LEN_FRAME) ||
+ buf[EXC3000_LEN_FRAME + 3])
+ return IRQ_HANDLED;
+ exc3000_process(input, buf + 4, EXC3000_SLOTS_PER_FRAME);
+ exc3000_process(input, buf + EXC3000_LEN_FRAME + 4,
+ buf[3] - EXC3000_SLOTS_PER_FRAME);
+ }
+ input_mt_sync_frame(input);
+ input_sync(input);
+ return IRQ_HANDLED;
+}
+
+static int exc3000_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct exc3000_data *data;
+ struct input_dev *input;
+ int error;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = "EETI EXC3000 Touch Screen";
+ input->id.bustype = BUS_I2C;
+
+ input_set_abs_params(input, ABS_X, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
+
+ error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error)
+ return error;
+
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ data->input = input;
+ data->client = client;
+ i2c_set_clientdata(client, data);
+
+ error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ exc3000_interrupt, IRQF_ONESHOT, client->name, data);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static const struct i2c_device_id exc3000_id[] = {
+ { "exc3000", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, exc3000_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id exc3000_of_match[] = {
+ { .compatible = "eeti,exc3000" },
+ { }
+};
+#endif
+
+static struct i2c_driver exc3000_driver = {
+ .driver = {
+ .name = "exc3000",
+ .of_match_table = of_match_ptr(exc3000_of_match),
+ },
+ .id_table = exc3000_id,
+ .probe = exc3000_probe,
+};
+
+module_i2c_driver(exc3000_driver);
+
+MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
+MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
+MODULE_LICENSE("GPL");
The 3000 series have a new protocol which allows to report up to 5 points in a single 66 byte frame. One must always read in 66 byte frames. To support up to 10 points, two consecutive frames need to be read: The first frame says how many points until sync. The second frame must say zero points or both frames must be discarded. To be able to work with the higher 400KHz I2C bus rate, one must successfully send a special package prior _each_ read or the controller will refuse to cooperate. This is a minimal implementation based on egalax_i2c.c (which can be found on the internet) and egalax_ts.c but without the vendor interface and no power management support. Signed-off-by: Ahmet Inan <inan@distec.de> --- .../bindings/input/touchscreen/exc3000.txt | 18 +++ drivers/input/touchscreen/Kconfig | 10 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/exc3000.c | 152 +++++++++++++++++++++ 4 files changed, 181 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/exc3000.txt create mode 100644 drivers/input/touchscreen/exc3000.c