This is a basic driver for the Zeitec ZET6223 I2C touchscreen controllers.
The driver does not support firmware loading, which is not required for
all tablets which contain this chip.
Signed-off-by: Jelle van der Waa <jelle@xxxxxxxx>
---
.../bindings/input/touchscreen/zet6223.txt | 32 ++++
.../devicetree/bindings/vendor-prefixes.txt | 1 +
drivers/input/touchscreen/Kconfig | 11 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/zet6223.c | 207 +++++++++++++++++++++
5 files changed, 252 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/zet6223.txt
create mode 100644 drivers/input/touchscreen/zet6223.c
diff --git a/Documentation/devicetree/bindings/input/touchscreen/zet6223.txt b/Documentation/devicetree/bindings/input/touchscreen/zet6223.txt
new file mode 100644
index 0000000..6a7a7ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/zet6223.txt
@@ -0,0 +1,32 @@
+* Zeitec ZET6223 I2C touchscreen controller
+
+Required properties:
+ - compatible : "zeitec,zet6223"
+ - reg : I2C slave address of the chip (0x76)
+ - interrupt-parent : a phandle pointing to the interrupt controller
+ serving the interrupt for this chip
+ - interrupts : interrupt specification for the zet6223 interrupt
+ - reset-gpios : Specification for the pin connected to the zeiteic's
+ reset pin. Required to be set low for flashing firmware.
+
+Optional properties:
+
+- touchscreen-size-x : See touchscreen.txt
+- touchscreen-size-y : See touchscreen.txt
+- touchscreen-inverted-x : See touchscreen.txt
+- touchscreen-inverted-y : See touchscreen.txt
+- touchscreen-swapped-x-y : See touchscreen.txt
+
+Example:
+
+i2c@00000000 {
+
+ zet6223: touchscreen@76 {
+ compatible = "zeitec,zet6223";
+ reg = <0x76>;
+ interrupt-parent = <&pio>;
+ interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>
+ reset-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
+ };
+
+};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 1992aa9..1c2cf45 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -295,5 +295,6 @@ xillybus Xillybus Ltd.
xlnx Xilinx
zyxel ZyXEL Communications Corp.
zarlink Zarlink Semiconductor
+zeitec ZEITEC Semiconductor Co., LTD.
zii Zodiac Inflight Innovations
zte ZTE Corp.
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2fb1f43..1fa4671 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1206,4 +1206,15 @@ config TOUCHSCREEN_ROHM_BU21023
To compile this driver as a module, choose M here: the
module will be called bu21023_ts.
+config TOUCHSCREEN_ZET6223
+ tristate "Zeitec ZET6223 touchscreen driver"
+ depends on I2C
+ help
+ Say Y here if you have a touchscreen using Zeitec ZET6223
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called zet6223.
+
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index b4373d6..af4608d 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -99,3 +99,4 @@ obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o
obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o
+obj-$(CONFIG_TOUCHSCREEN_ZET6223) += zet6223.o
diff --git a/drivers/input/touchscreen/zet6223.c b/drivers/input/touchscreen/zet6223.c
new file mode 100644
index 0000000..1e2f64d
--- /dev/null
+++ b/drivers/input/touchscreen/zet6223.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2016, Jelle van der Waa <jelle@xxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <asm/unaligned.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/module.h>
+
+#define ZET6223_CMD_INFO 0xB2
+#define ZET6223_CMD_INFO_LENGTH 17
+#define ZET6223_VALID_PACKET 0x3c
+
+struct zet6223_data {
+ struct gpio_desc *reset_gpios;
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct touchscreen_properties prop;
+ u8 fingernum;
+};
+
+static int zet6223_start(struct input_dev *dev)
+{
+ struct zet6223_data *data = input_get_drvdata(dev);
+
+ enable_irq(data->client->irq);
+
+ return 0;
+}
+
+static void zet6223_stop(struct input_dev *dev)
+{
+ struct zet6223_data *data = input_get_drvdata(dev);
+
+ disable_irq(data->client->irq);
+}
+
+static irqreturn_t irqreturn_t_zet6223(int irq, void *dev_id)
+{
+ struct device *dev = &data->client->dev;
+ struct zet6223_data *data = dev_id;
+ /*
+ * First 3 bytes are an identifier, two bytes of finger data.
+ * X, Y data per finger is 4 bytes.
+ */
+ u8 bufsize = 3 + 4 * data->fingernum;
+ u8 buf[bufsize];
+ u8 i;
+ u16 finger_bits;
+ int ret;
+
+ ret = i2c_master_recv(data->client, buf, bufsize);
+ if (ret != bufsize) {
+ dev_err_ratelimited(dev, "Error reading input data: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+
+ if (buf[0] != ZET6223_VALID_PACKET)
+ return IRQ_HANDLED;
+
+ finger_bits = get_unaligned_be16(buf + 1);
+ for (i = 0; i < data->fingernum; i++) {
+ if (!(finger_bits & BIT(15 - i)))
+ continue;
+
+ input_mt_slot(data->input, i);
+ input_mt_report_slot_state(data->input, MT_TOOL_FINGER, true);
+ input_event(data->input, EV_ABS, ABS_MT_POSITION_X,
+ ((buf[i + 3] >> 4) << 8) + buf[i + 4]);
+ input_event(data->input, EV_ABS, ABS_MT_POSITION_Y,
+ ((buf[i + 3] & 0xF) << 8) + buf[i + 5]);
+ }
+
+ input_mt_sync_frame(data->input);
+ input_sync(data->input);
+
+ return IRQ_HANDLED;
+}
+
+static int zet6223_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct zet6223_data *data;
+ struct input_dev *input;
+ u8 buf[ZET6223_CMD_INFO_LENGTH];
+ u8 cmd = ZET6223_CMD_INFO;
+ int ret, error;
+
+ if (!client->irq) {
+ dev_err(dev, "Error no irq specified\n");
+ return -EINVAL;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->reset_gpios = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(data->reset_gpios)) {
+ error = PTR_ERR(data->reset_gpios);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "Error getting reset gpio: %d\n", error);
+ return error;
+ }
+
+ ret = i2c_master_send(client, &cmd, 1);
+ if (ret < 0) {
+ dev_err(dev, "touchpanel info cmd failed: %d\n", ret);
+ return -ENODEV;
+ }
+
+ ret = i2c_master_recv(client, buf, ZET6223_CMD_INFO_LENGTH);
+ if (ret < 0) {
+ dev_err(dev, "cannot retrieve touchpanel info: %d\n", ret);
+ return -ENODEV;
+ }
+
+ data->fingernum = buf[15] & 0x7F;
+ if (data->fingernum > 16) {
+ data->fingernum = 16;
+ dev_warn(dev, "touchpanel reports more then 16 fingers, limit to 16");
+ }
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
+ get_unaligned_le16(&buf[8]), 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
+ get_unaligned_le16(&buf[10]), 0, 0);
+ touchscreen_parse_properties(input, true, &data->prop);
+
+ input->name = client->name;
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = dev;
+ input->open = zet6223_start;
+ input->close = zet6223_stop;
+
+ ret = input_mt_init_slots(input, data->fingernum,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (ret)
+ return ret;
+
+ data->client = client;
+ data->input = input;
+
+ input_set_drvdata(input, data);
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ irqreturn_t_zet6223, IRQF_ONESHOT, client->name, data);
+ if (ret) {
+ dev_err(dev, "Error requesting irq: %d\n", ret);
+ return ret;
+ }
+
+ zet6223_stop(input);
+
+ ret = input_register_device(input);
+ if (ret)
+ return ret;
+
+ i2c_set_clientdata(client, data);
+
+ return 0;
+}
+
+static const struct of_device_id zet6223_of_match[] = {
+ { .compatible = "zeitec", "zet6223" },
+ { }
+};
+
+static const struct i2c_device_id zet6223_id[] = {
+ { "zet6223", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, zet6223_id);
+
+static struct i2c_driver zet6223_driver = {
+ .driver = {
+ .name = "zet6223",
+ .of_match_table = zet6223_of_match,
+ },
+ .probe = zet6223_probe,
+ .id_table = zet6223_id
+};
+
+module_i2c_driver(zet6223_driver);
+
+MODULE_AUTHOR("Jelle van der Waa <jelle@xxxxxxxx>");
+MODULE_DESCRIPTION("ZEITEC zet622x I2C touchscreen driver");
+MODULE_LICENSE("GPL");
--
2.9.3
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