This patch adds the EETI eGalax serial multi touch controller driver.
EETI eGalax serial touch screen controller is a I2C based multiple
capacitive touch screen controller, it can support 5 touch events maximum.
Signed-off-by: Zhang Jiejing <jiejing.zhang@xxxxxxxxxxxxx>
---
V1 changes:
* use mt protocol B for report pointer.
* get the pressure value from pointer.
* use macro to define X,Y max value.
V2 changes:
* change MODE_SINGLE to a meanful name MODE_MOUSE
* add some comment on each mode to avoid misunderstand
V3 changes:
* some typo fix
* remove MODE_MOUSE, since it can't support both mode 100% well.
also use this chip as MODE_MOUSE is very rare case.
---
drivers/input/touchscreen/Kconfig | 10 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/egalax_ts.c | 289 +++++++++++++++++++++++++++++++++
3 files changed, 300 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/egalax_ts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index cabd9e5..92f02b0 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -177,6 +177,16 @@ config TOUCHSCREEN_EETI
To compile this driver as a module, choose M here: the
module will be called eeti_ts.
+config TOUCHSCREEN_EGALAX
+ tristate "EETI eGalax multi-touch panel support"
+ depends on I2C
+ help
+ Say Y here to enable support for I2C connected EETI
+ eGalax multi-touch panels.
+
+ To compile this driver as a module, choose M here: the
+ module will be called egalax_ts.
+
config TOUCHSCREEN_FUJITSU
tristate "Fujitsu serial touchscreen"
select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 282d6f7..a787ebc 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
+obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
new file mode 100644
index 0000000..10623e8
--- /dev/null
+++ b/drivers/input/touchscreen/egalax_ts.c
@@ -0,0 +1,289 @@
+/*
+ * Driver for EETI eGalax Multiple Touch Controller
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc.
+ *
+ * based on max11801_ts.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.
+ */
+
+/* EETI eGalax serial touch screen controller is a I2C based multiple
+ * touch screen controller, it can supports 5 pointer multiple touch. */
+
+/* TODO:
+ - auto idle mode support
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/input/mt.h>
+
+/* Mouse Mode: some panel may configure the controller to mouse mode,
+ * which can only report one point at a given time.
+ * This driver will ignore events in this mode.
+ */
+#define REPORT_MODE_MOUSE 0x1
+/* Vendor Mode: this mode is used to transfer some vendor specify
+ * messages, it was ignore in this driver.
+ * This driver will ignore events in this mode.
+ */
+#define REPORT_MODE_VENDOR 0x3
+/* Multiple Touch Mode */
+#define REPORT_MODE_MTTOUCH 0x4
+
+#define MAX_SUPPORT_POINTS 5
+
+#define EVENT_VALID_OFFSET 7
+#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET)
+#define EVENT_ID_OFFSET 2
+#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET)
+#define EVENT_IN_RANGE (0x1 << 1)
+#define EVENT_DOWN_UP (0X1 << 0)
+
+#define MAX_I2C_DATA_LEN 10
+
+#define EGALAX_MAX_X 32760
+#define EGALAX_MAX_Y 32760
+
+struct egalax_ts {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+};
+
+static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
+{
+ struct egalax_ts *data = dev_id;
+ struct input_dev *input_dev = data->input_dev;
+ struct i2c_client *client = data->client;
+ u8 buf[MAX_I2C_DATA_LEN];
+ int id, ret, x, y, z;
+ bool down, valid;
+ u8 state;
+
+retry:
+ ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN);
+ if (ret == -EAGAIN)
+ goto retry;
+
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ if (buf[0] != REPORT_MODE_MTTOUCH) {
+ /* ignore mouse events and vendor events */
+ return IRQ_HANDLED;
+ }
+
+ state = buf[1];
+ x = (buf[3] << 8) | buf[2];
+ y = (buf[5] << 8) | buf[4];
+ z = (buf[7] << 8) | buf[6];
+
+ valid = state & EVENT_VALID_MASK;
+ id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET;
+ down = state & EVENT_DOWN_UP;
+
+ if (!valid || id > MAX_SUPPORT_POINTS) {
+ dev_dbg(&client->dev, "point invalid\n");
+ return IRQ_HANDLED;
+ }
+
+ input_mt_slot(input_dev, id);
+ input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down);
+
+ dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",
+ (down ? "down" : "up"), id, x, y, z);
+
+ if (down) {
+ input_report_abs(input_dev, ABS_MT_POSITION_X, x);
+ input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
+ input_report_abs(input_dev, ABS_MT_PRESSURE, z);
+ }
+
+ input_mt_report_pointer_emulation(input_dev, true);
+ input_sync(input_dev);
+ return IRQ_HANDLED;
+}
+
+/* wake up controller by an falling edge of interrupt gpio. */
+static int egalax_wake_up_device(struct i2c_client *client)
+{
+ int gpio = irq_to_gpio(client->irq);
+ int ret;
+
+ ret = gpio_request(gpio, "egalax_irq");
+ if (ret < 0) {
+ dev_err(&client->dev, "request gpio failed,"
+ "cannot wake up controller:%d\n", ret);
+ return ret;
+ }
+ /* wake up controller via an falling edge on IRQ gpio. */
+ gpio_direction_output(gpio, 0);
+ gpio_set_value(gpio, 1);
+ /* controller should be waken up, return irq. */
+ gpio_direction_input(gpio);
+ gpio_free(gpio);
+ return 0;
+}
+
+static int egalax_firmware_version(struct i2c_client *client)
+{
+ static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
+ int ret;
+ ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+static int __devinit egalax_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct egalax_ts *data;
+ struct input_dev *input_dev;
+ int ret;
+
+ data = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL);
+ if (!data) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ ret = -ENOMEM;
+ goto err_free_data;
+ }
+
+ data->client = client;
+ data->input_dev = input_dev;
+ /* controller may be in sleep, wake it up. */
+ egalax_wake_up_device(client);
+ ret = egalax_firmware_version(client);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "egalax_ts: failed to read firmware version\n");
+ ret = -EIO;
+ goto err_free_dev;
+ }
+
+ input_dev->name = "EETI eGalax Touch Screen";
+ input_dev->phys = "I2C",
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+ __set_bit(EV_SYN, input_dev->evbit);
+ __set_bit(ABS_X, input_dev->absbit);
+ __set_bit(ABS_Y, input_dev->absbit);
+
+ input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0);
+ input_set_abs_params(input_dev,
+ ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0);
+ input_set_abs_params(input_dev,
+ ABS_MT_POSITION_X, 0, EGALAX_MAX_Y, 0, 0);
+ input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS);
+
+ input_set_drvdata(input_dev, data);
+
+ ret = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "egalax_ts", data);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ goto err_free_dev;
+ }
+
+ ret = input_register_device(data->input_dev);
+ if (ret < 0)
+ goto err_free_irq;
+ i2c_set_clientdata(client, data);
+ return 0;
+
+err_free_irq:
+ free_irq(client->irq, data);
+err_free_dev:
+ input_free_device(input_dev);
+err_free_data:
+ kfree(data);
+
+ return ret;
+}
+
+static __devexit int egalax_ts_remove(struct i2c_client *client)
+{
+ struct egalax_ts *data = i2c_get_clientdata(client);
+
+ free_irq(client->irq, data);
+ input_unregister_device(data->input_dev);
+ input_free_device(data->input_dev);
+ kfree(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id egalax_ts_id[] = {
+ {"egalax_ts", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
+
+#ifdef CONFIG_PM_SLEEP
+static int egalax_ts_suspend(struct device *dev)
+{
+ int ret;
+ u8 suspend_cmd[MAX_I2C_DATA_LEN] = {0x3, 0x6, 0xa, 0x3, 0x36,
+ 0x3f, 0x2, 0, 0, 0};
+ struct i2c_client *client = to_i2c_client(dev);
+ ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
+ return ret > 0 ? 0 : ret;
+}
+
+static int egalax_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return egalax_wake_up_device(client);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
+static struct i2c_driver egalax_ts_driver = {
+ .driver = {
+ .name = "egalax_ts",
+ .pm = &egalax_ts_pm_ops,
+ },
+ .id_table = egalax_ts_id,
+ .probe = egalax_ts_probe,
+ .remove = __devexit_p(egalax_ts_remove),
+};
+
+static int __init egalax_ts_init(void)
+{
+ return i2c_add_driver(&egalax_ts_driver);
+}
+
+static void __exit egalax_ts_exit(void)
+{
+ i2c_del_driver(&egalax_ts_driver);
+}
+
+module_init(egalax_ts_init);
+module_exit(egalax_ts_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
+MODULE_LICENSE("GPL");
--
1.7.1
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