From: Böszörményi Zoltán <zbos...@pr.hu>

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 <zbos...@pr.hu>

---
 drivers/input/touchscreen/Kconfig  |  10 ++
 drivers/input/touchscreen/Makefile |   1 +
 drivers/input/touchscreen/egalax.c | 210 +++++++++++++++++++++++++++++++++++++
 include/uapi/linux/serio.h         |   1 +
 4 files changed, 222 insertions(+)
 create mode 100644 drivers/input/touchscreen/egalax.c

diff --git a/drivers/input/touchscreen/Kconfig 
b/drivers/input/touchscreen/Kconfig
index ae33da7..816a9dc 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -301,20 +301,30 @@ config TOUCHSCREEN_FT6236
        depends on GPIOLIB || COMPILE_TEST
        help
          Say Y here to enable support for the I2C connected FT6x06 and
          FT6x36 family of capacitive touchscreen drivers.
 
          If unsure, say N.
 
          To compile this driver as a module, choose M here: the
          module will be called ft6236.
 
+config TOUCHSCREEN_EGALAX_SERIO
+       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.
+
 config TOUCHSCREEN_FUJITSU
        tristate "Fujitsu serial touchscreen"
        select SERIO
        help
          Say Y here if you have the Fujitsu touchscreen (such as one
          installed in Lifebook P series laptop) connected to your
          system.
 
          If unsure, say N.
 
diff --git a/drivers/input/touchscreen/Makefile 
b/drivers/input/touchscreen/Makefile
index cbaa6ab..6f63b51 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -28,20 +28,21 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_SPI)       += cyttsp4_spi.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)       += da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DA9052)       += da9052_tsi.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)      += dynapro.o
 obj-$(CONFIG_TOUCHSCREEN_EDT_FT5X06)   += edt-ft5x06.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)    += hampshire.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)                += gunze.o
 obj-$(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_SERIO) += egalax.o
 obj-$(CONFIG_TOUCHSCREEN_FT6236)       += ft6236.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)      += fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GOODIX)       += goodix.o
 obj-$(CONFIG_TOUCHSCREEN_ILI210X)      += ili210x.o
 obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)   += imx6ul_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)       += inexio.o
 obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)    += intel-mid-touch.o
 obj-$(CONFIG_TOUCHSCREEN_IPROC)                += bcm_iproc_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_LPC32XX)      += lpc32xx_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MAX11801)     += max11801_ts.o
diff --git a/drivers/input/touchscreen/egalax.c 
b/drivers/input/touchscreen/egalax.c
new file mode 100644
index 0000000..94ac9bd
--- /dev/null
+++ b/drivers/input/touchscreen/egalax.c
@@ -0,0 +1,210 @@
+/*
+ * EETI Egalax serial touchscreen driver
+ *
+ * Copyright (c) 2015 Zoltán Böszörményi <zbos...@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"
+
+MODULE_AUTHOR("Zoltán Böszörményi <zbos...@pr.hu>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define EGALAX_FORMAT_MAX_LENGTH 6
+#define EGALAX_RESPONSE_BEGIN_BYTE 0x80
+#define EGALAX_FORMAT_PRESSURE_BIT 0x40
+#define EGALAX_FORMAT_TOUCH_BIT 0x01
+#define EGALAX_FORMAT_RESOLUTION 0x06
+
+#define EGALAX_MIN_XC 0
+#define EGALAX_MAX_XC 0x4000
+#define EGALAX_MIN_YC 0
+#define EGALAX_MAX_YC 0x4000
+
+#define EGALAX_GET_XC(data, resbits, shift) ((((data[1] & (resbits)) << 7) | 
(data[2] & 0x7f)) << shift)
+#define EGALAX_GET_YC(data, resbits, shift) ((((data[3] & (resbits)) << 7) | 
(data[4] & 0x7f)) << shift)
+#define EGALAX_GET_TOUCHED(data) (EGALAX_FORMAT_TOUCH_BIT & data[0])
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct egalax {
+       struct input_dev *dev;
+       struct serio *serio;
+       int idx;
+       int bytes;
+       int resbits;
+       int shift;
+       unsigned char data[EGALAX_FORMAT_MAX_LENGTH];
+       char phys[32];
+};
+
+static void egalax_process_data(struct egalax *pegalax)
+{
+       struct input_dev *dev = pegalax->dev;
+
+       if (++pegalax->idx == pegalax->bytes) {
+               input_report_abs(dev, ABS_X, EGALAX_GET_XC(pegalax->data, 
pegalax->resbits, pegalax->shift));
+               input_report_abs(dev, ABS_Y, EGALAX_GET_YC(pegalax->data, 
pegalax->resbits, pegalax->shift));
+               input_report_key(dev, BTN_TOUCH, 
EGALAX_GET_TOUCHED(pegalax->data));
+               input_sync(dev);
+
+               pegalax->idx = 0;
+       }
+}
+
+static irqreturn_t egalax_interrupt(struct serio *serio,
+               unsigned char data, unsigned int flags)
+{
+       struct egalax *pegalax = serio_get_drvdata(serio);
+
+       pegalax->data[pegalax->idx] = data;
+
+       if (EGALAX_RESPONSE_BEGIN_BYTE & pegalax->data[0]) {
+               pegalax->bytes = (EGALAX_FORMAT_PRESSURE_BIT & pegalax->data[0] 
? 6 : 5);
+               switch ((EGALAX_FORMAT_RESOLUTION & pegalax->data[0]) >> 1) {
+               case 0:
+                       pegalax->resbits = 0x0f;
+                       pegalax->shift = 3;
+                       break;
+               case 1:
+                       pegalax->resbits = 0x1f;
+                       pegalax->shift = 2;
+                       break;
+               case 2:
+                       pegalax->resbits = 0x3f;
+                       pegalax->shift = 1;
+                       break;
+               default:
+                       pegalax->resbits = 0x7f;
+                       pegalax->shift = 0;
+                       break;
+               }
+               egalax_process_data(pegalax);
+       }
+       else
+               dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
+                       pegalax->data[0]);
+
+       return IRQ_HANDLED;
+}
+
+static void egalax_disconnect(struct serio *serio)
+{
+       struct egalax *pegalax = serio_get_drvdata(serio);
+
+       input_get_device(pegalax->dev);
+       input_unregister_device(pegalax->dev);
+       serio_close(serio);
+       serio_set_drvdata(serio, NULL);
+       input_put_device(pegalax->dev);
+       kfree(pegalax);
+}
+
+/*
+ * 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 *pegalax;
+       struct input_dev *input_dev;
+       int err;
+
+       pegalax = kzalloc(sizeof(struct egalax), GFP_KERNEL);
+       input_dev = input_allocate_device();
+       if (!pegalax || !input_dev) {
+               err = -ENOMEM;
+               goto fail1;
+       }
+
+       pegalax->serio = serio;
+       pegalax->dev = input_dev;
+       snprintf(pegalax->phys, sizeof(pegalax->phys),
+                "%s/input0", serio->phys);
+
+       input_dev->name = "EETI eGalaxTouch Serial TouchScreen";
+       input_dev->phys = pegalax->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_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+       input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+       input_set_abs_params(pegalax->dev, ABS_X,
+                            EGALAX_MIN_XC, EGALAX_MAX_XC, 0, 0);
+       input_set_abs_params(pegalax->dev, ABS_Y,
+                            EGALAX_MIN_YC, EGALAX_MAX_YC, 0, 0);
+
+       serio_set_drvdata(serio, pegalax);
+
+       err = serio_open(serio, drv);
+       if (err)
+               goto fail2;
+
+       err = input_register_device(pegalax->dev);
+       if (err)
+               goto fail3;
+
+       return 0;
+
+ fail3:        serio_close(serio);
+ fail2:        serio_set_drvdata(serio, NULL);
+ fail1:        input_free_device(input_dev);
+       kfree(pegalax);
+       return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static 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);
diff --git a/include/uapi/linux/serio.h b/include/uapi/linux/serio.h
index becdd78..c2ea169 100644
--- a/include/uapi/linux/serio.h
+++ b/include/uapi/linux/serio.h
@@ -70,12 +70,13 @@
 #define SERIO_FUJITSU  0x35
 #define SERIO_ZHENHUA  0x36
 #define SERIO_INEXIO   0x37
 #define SERIO_TOUCHIT213       0x38
 #define SERIO_W8001    0x39
 #define SERIO_DYNAPRO  0x3a
 #define SERIO_HAMPSHIRE        0x3b
 #define SERIO_PS2MULT  0x3c
 #define SERIO_TSC40    0x3d
 #define SERIO_WACOM_IV 0x3e
+#define SERIO_EGALAX   0x3f
 
 #endif /* _UAPI_SERIO_H */
-- 
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to