Input: Add driver for iNexio serial touchscreen.

Signed-off-by: Richard Lemon <richard@codelemon.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 220 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 030a89734855..4085791e7be2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -103,6 +103,18 @@ config TOUCHSCREEN_MTOUCH
           To compile this driver as a module, choose M here: the
           module will be called mtouch.
 
+config TOUCHSCREEN_INEXIO
+        tristate "iNexio serial touchscreens"
+        select SERIO
+        help
+          Say Y here if you have an iNexio serial touchscreen connected to
+          your system.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called inexio.
+
 config TOUCHSCREEN_MK712
         tristate "ICS MicroClock MK712 touchscreen"
         help
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 64a11f443dce..d63bcdcd28ec 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_TOUCHSCREEN_CORGI)		+= corgi_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)         += gunze.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)           += elo.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)       += fujitsu_ts.o
+obj-$(CONFIG_TOUCHSCREEN_INEXIO)        += inexio.o
 obj-$(CONFIG_TOUCHSCREEN_MIGOR)         += migor_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH)        += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)         += mk712.o
diff --git a/drivers/input/touchscreen/inexio.c b/drivers/input/touchscreen/inexio.c
new file mode 100644
index 000000000000..192ade0a0fb9
--- /dev/null
+++ b/drivers/input/touchscreen/inexio.c
@@ -0,0 +1,207 @@
+/*
+ * iNexio serial touchscreen driver
+ *
+ * Copyright (c) 2008 Richard Lemon
+ * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
+ *
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * 2008/06/19 Richard Lemon <richard@codelemon.com>
+ *   Copied mtouch.c and edited for iNexio protocol
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+
+#define DRIVER_DESC     "iNexio serial touchscreen driver"
+
+MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define INEXIO_FORMAT_TOUCH_BIT 0x01
+#define INEXIO_FORMAT_LENGTH 5
+#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
+
+/* todo: check specs for max length of all responses */
+#define INEXIO_MAX_LENGTH 16
+
+#define INEXIO_MIN_XC 0
+#define INEXIO_MAX_XC 0x3fff
+#define INEXIO_MIN_YC 0
+#define INEXIO_MAX_YC 0x3fff
+
+#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
+#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
+#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct inexio {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        unsigned char data[INEXIO_MAX_LENGTH];
+        char phys[32];
+};
+
+static void inexio_process_data(struct inexio *pinexio)
+{
+        struct input_dev *dev = pinexio->dev;
+
+        if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
+                input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
+                input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
+                input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
+                input_sync(dev);
+
+                pinexio->idx = 0;
+        }
+}
+
+static irqreturn_t inexio_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags)
+{
+        struct inexio* pinexio = serio_get_drvdata(serio);
+
+        pinexio->data[pinexio->idx] = data;
+
+        if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
+                inexio_process_data(pinexio);
+        else
+                printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * inexio_disconnect() is the opposite of inexio_connect()
+ */
+
+static void inexio_disconnect(struct serio *serio)
+{
+        struct inexio* pinexio = serio_get_drvdata(serio);
+
+        input_get_device(pinexio->dev);
+        input_unregister_device(pinexio->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(pinexio->dev);
+        kfree(pinexio);
+}
+
+/*
+ * inexio_connect() is the routine that is called when someone adds a
+ * new serio device that supports iNexio protocol and registers it as
+ * an input device. This is usually accomplished using inputattach.
+ */
+
+static int inexio_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct inexio *pinexio;
+        struct input_dev *input_dev;
+        int err;
+
+        pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!pinexio || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        pinexio->serio = serio;
+        pinexio->dev = input_dev;
+        snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
+
+        input_dev->name = "iNexio Serial TouchScreen";
+        input_dev->phys = pinexio->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_INEXIO;
+        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(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
+        input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
+
+        serio_set_drvdata(serio, pinexio);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(pinexio->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(pinexio);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id inexio_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_INEXIO,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
+
+static struct serio_driver inexio_drv = {
+        .driver         = {
+                .name   = "inexio",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = inexio_serio_ids,
+        .interrupt      = inexio_interrupt,
+        .connect        = inexio_connect,
+        .disconnect     = inexio_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init inexio_init(void)
+{
+        return serio_register_driver(&inexio_drv);
+}
+
+static void __exit inexio_exit(void)
+{
+        serio_unregister_driver(&inexio_drv);
+}
+
+module_init(inexio_init);
+module_exit(inexio_exit);