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authorBöszörményi Zoltán <zboszormenyi@sicom.com>2015-12-16 22:11:50 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2015-12-16 22:31:33 +0300
commit6b0f8f9c52efe24d6dac06ab963b7bd91c723751 (patch)
treee5881028b6681f697de6ea3ee6e6b46560e6c732
parentf889beaaab1ce2ff9d018302359abb345f49be29 (diff)
downloadlinux-6b0f8f9c52efe24d6dac06ab963b7bd91c723751.tar.xz
Input: add eGalaxTouch serial touchscreen driver
There are two EETI touchscreen drivers in the kernel (eeti_ts and egalax_ts) but both are for I2C-connected panels. This is for a different, serial and not multi-touch touchscreen panel. The protocol documentation is at http://www.eeti.com.tw/pdf/Software%20Programming%20Guide_v2.0.pdf Signed-off-by: Böszörményi Zoltán <zboszor@pr.hu> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
-rw-r--r--drivers/input/touchscreen/Kconfig10
-rw-r--r--drivers/input/touchscreen/Makefile1
-rw-r--r--drivers/input/touchscreen/egalax_ts_serial.c194
-rw-r--r--include/uapi/linux/serio.h1
4 files changed, 206 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index ae33da7ab51f..9bcb718668b2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -295,6 +295,16 @@ config TOUCHSCREEN_EGALAX
To compile this driver as a module, choose M here: the
module will be called egalax_ts.
+config TOUCHSCREEN_EGALAX_SERIAL
+ tristate "EETI eGalax serial touchscreen"
+ select SERIO
+ help
+ Say Y here to enable support for serial connected EETI
+ eGalax touch panels.
+
+ To compile this driver as a module, choose M here: the
+ module will be called egalax_ts_serial.
+
config TOUCHSCREEN_FT6236
tristate "FT6236 I2C touchscreen"
depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index cbaa6abb08da..001357c3f73f 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
obj-$(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_FT6236) += ft6236.o
obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
diff --git a/drivers/input/touchscreen/egalax_ts_serial.c b/drivers/input/touchscreen/egalax_ts_serial.c
new file mode 100644
index 000000000000..a078c1c2c3f9
--- /dev/null
+++ b/drivers/input/touchscreen/egalax_ts_serial.c
@@ -0,0 +1,194 @@
+/*
+ * EETI Egalax serial touchscreen driver
+ *
+ * Copyright (c) 2015 Zoltán Böszörményi <zboszor@pr.hu>
+ *
+ * based on the
+ *
+ * Hampshire serial touchscreen driver (Copyright (c) 2010 Adam Bennett)
+ */
+
+/*
+ * 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/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+
+#define DRIVER_DESC "EETI Egalax serial touchscreen driver"
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define EGALAX_FORMAT_MAX_LENGTH 6
+#define EGALAX_FORMAT_START_BIT BIT(7)
+#define EGALAX_FORMAT_PRESSURE_BIT BIT(6)
+#define EGALAX_FORMAT_TOUCH_BIT BIT(0)
+#define EGALAX_FORMAT_RESOLUTION_MASK 0x06
+
+#define EGALAX_MIN_XC 0
+#define EGALAX_MAX_XC 0x4000
+#define EGALAX_MIN_YC 0
+#define EGALAX_MAX_YC 0x4000
+
+/*
+ * Per-touchscreen data.
+ */
+struct egalax {
+ struct input_dev *input;
+ struct serio *serio;
+ int idx;
+ u8 data[EGALAX_FORMAT_MAX_LENGTH];
+ char phys[32];
+};
+
+static void egalax_process_data(struct egalax *egalax)
+{
+ struct input_dev *dev = egalax->input;
+ u8 *data = egalax->data;
+ u16 x, y;
+ u8 shift;
+ u8 mask;
+
+ shift = 3 - ((data[0] & EGALAX_FORMAT_RESOLUTION_MASK) >> 1);
+ mask = 0xff >> (shift + 1);
+
+ x = (((u16)(data[1] & mask) << 7) | (data[2] & 0x7f)) << shift;
+ y = (((u16)(data[3] & mask) << 7) | (data[4] & 0x7f)) << shift;
+
+ input_report_key(dev, BTN_TOUCH, data[0] & EGALAX_FORMAT_TOUCH_BIT);
+ input_report_abs(dev, ABS_X, x);
+ input_report_abs(dev, ABS_Y, y);
+ input_sync(dev);
+}
+
+static irqreturn_t egalax_interrupt(struct serio *serio,
+ unsigned char data, unsigned int flags)
+{
+ struct egalax *egalax = serio_get_drvdata(serio);
+ int pkt_len;
+
+ egalax->data[egalax->idx++] = data;
+
+ if (likely(egalax->data[0] & EGALAX_FORMAT_START_BIT)) {
+ pkt_len = egalax->data[0] & EGALAX_FORMAT_PRESSURE_BIT ? 6 : 5;
+ if (pkt_len == egalax->idx) {
+ egalax_process_data(egalax);
+ egalax->idx = 0;
+ }
+ } else {
+ dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
+ egalax->data[0]);
+ egalax->idx = 0;
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * egalax_connect() is the routine that is called when someone adds a
+ * new serio device that supports egalax protocol and registers it as
+ * an input device. This is usually accomplished using inputattach.
+ */
+static int egalax_connect(struct serio *serio, struct serio_driver *drv)
+{
+ struct egalax *egalax;
+ struct input_dev *input_dev;
+ int error;
+
+ egalax = kzalloc(sizeof(struct egalax), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!egalax) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ egalax->serio = serio;
+ egalax->input = input_dev;
+ snprintf(egalax->phys, sizeof(egalax->phys),
+ "%s/input0", serio->phys);
+
+ input_dev->name = "EETI eGalaxTouch Serial TouchScreen";
+ input_dev->phys = egalax->phys;
+ input_dev->id.bustype = BUS_RS232;
+ input_dev->id.vendor = SERIO_EGALAX;
+ input_dev->id.product = 0;
+ input_dev->id.version = 0x0001;
+ input_dev->dev.parent = &serio->dev;
+
+ input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
+ input_set_abs_params(input_dev, ABS_X,
+ EGALAX_MIN_XC, EGALAX_MAX_XC, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y,
+ EGALAX_MIN_YC, EGALAX_MAX_YC, 0, 0);
+
+ serio_set_drvdata(serio, egalax);
+
+ error = serio_open(serio, drv);
+ if (error)
+ goto err_reset_drvdata;
+
+ error = input_register_device(input_dev);
+ if (error)
+ goto err_close_serio;
+
+ return 0;
+
+err_close_serio:
+ serio_close(serio);
+err_reset_drvdata:
+ serio_set_drvdata(serio, NULL);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(egalax);
+ return error;
+}
+
+static void egalax_disconnect(struct serio *serio)
+{
+ struct egalax *egalax = serio_get_drvdata(serio);
+
+ serio_close(serio);
+ serio_set_drvdata(serio, NULL);
+ input_unregister_device(egalax->input);
+ kfree(egalax);
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static const struct serio_device_id egalax_serio_ids[] = {
+ {
+ .type = SERIO_RS232,
+ .proto = SERIO_EGALAX,
+ .id = SERIO_ANY,
+ .extra = SERIO_ANY,
+ },
+ { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, egalax_serio_ids);
+
+static struct serio_driver egalax_drv = {
+ .driver = {
+ .name = "egalax",
+ },
+ .description = DRIVER_DESC,
+ .id_table = egalax_serio_ids,
+ .interrupt = egalax_interrupt,
+ .connect = egalax_connect,
+ .disconnect = egalax_disconnect,
+};
+module_serio_driver(egalax_drv);
+
+MODULE_AUTHOR("Zoltán Böszörményi <zboszor@pr.hu>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
diff --git a/include/uapi/linux/serio.h b/include/uapi/linux/serio.h
index becdd78295cc..c2ea1698257f 100644
--- a/include/uapi/linux/serio.h
+++ b/include/uapi/linux/serio.h
@@ -77,5 +77,6 @@
#define SERIO_PS2MULT 0x3c
#define SERIO_TSC40 0x3d
#define SERIO_WACOM_IV 0x3e
+#define SERIO_EGALAX 0x3f
#endif /* _UAPI_SERIO_H */