Input: add driver for Tabletkiosk Sahara TouchIT-213 touchscreen

Signed-off-by: Claudio Nieder <private@claudio.ch>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 234 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/touchit213.c b/drivers/input/touchscreen/touchit213.c
new file mode 100644
index 000000000000..d1297ba19daf
--- /dev/null
+++ b/drivers/input/touchscreen/touchit213.c
@@ -0,0 +1,234 @@
+/*
+ * Sahara TouchIT-213 serial touchscreen driver
+ *
+ * Copyright (c) 2007-2008 Claudio Nieder <private@claudio.ch>
+ *
+ * Based on Touchright driver (drivers/input/touchscreen/touchright.c)
+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
+ * Copyright (c) 2004 Vojtech Pavlik
+ * and Dan Streetman <ddstreet@ieee.org>
+ */
+
+/*
+ * 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>
+#include <linux/init.h>
+
+#define DRIVER_DESC     "Sahara TouchIT-213 serial touchscreen driver"
+
+MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+/*
+ * Data is received through COM1 at 9600bit/s,8bit,no parity in packets
+ * of 5 byte each.
+ *
+ *   +--------+   +--------+   +--------+   +--------+   +--------+
+ *   |1000000p|   |0xxxxxxx|   |0xxxxxxx|   |0yyyyyyy|   |0yyyyyyy|
+ *   +--------+   +--------+   +--------+   +--------+   +--------+
+ *                    MSB          LSB          MSB          LSB
+ *
+ * The value of p is 1 as long as the screen is touched and 0 when
+ * reporting the location where touching stopped, e.g. where the pen was
+ * lifted from the screen.
+ *
+ * When holding the screen in landscape mode as the BIOS text output is
+ * presented, x is the horizontal axis with values growing from left to
+ * right and y is the vertical axis with values growing from top to
+ * bottom.
+ *
+ * When holding the screen in portrait mode with the Sahara logo in its
+ * correct position, x ist the vertical axis with values growing from
+ * top to bottom and y is the horizontal axis with values growing from
+ * right to left.
+ */
+
+#define T213_FORMAT_TOUCH_BIT   0x01
+#define T213_FORMAT_STATUS_BYTE 0x80
+#define T213_FORMAT_STATUS_MASK ~T213_FORMAT_TOUCH_BIT
+
+/*
+ * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0
+ * and y values from 0x1d to 0x7e9, so the actual measurement is
+ * probably done with an 11 bit precision.
+ */
+#define T213_MIN_XC 0
+#define T213_MAX_XC 0x07ff
+#define T213_MIN_YC 0
+#define T213_MAX_YC 0x07ff
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct touchit213 {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        unsigned char csum;
+        unsigned char data[5];
+        char phys[32];
+};
+
+static irqreturn_t touchit213_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags)
+{
+        struct touchit213 *touchit213 = serio_get_drvdata(serio);
+        struct input_dev *dev = touchit213->dev;
+
+        touchit213->data[touchit213->idx] = data;
+
+        switch (touchit213->idx++) {
+        case 0:
+                if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) !=
+                                T213_FORMAT_STATUS_BYTE) {
+                        pr_debug("unsynchronized data: 0x%02x\n", data);
+                        touchit213->idx = 0;
+                }
+                break;
+
+        case 4:
+                touchit213->idx = 0;
+                input_report_abs(dev, ABS_X,
+                        (touchit213->data[1] << 7) | touchit213->data[2]);
+                input_report_abs(dev, ABS_Y,
+                        (touchit213->data[3] << 7) | touchit213->data[4]);
+                input_report_key(dev, BTN_TOUCH,
+                        touchit213->data[0] & T213_FORMAT_TOUCH_BIT);
+                input_sync(dev);
+                break;
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * touchit213_disconnect() is the opposite of touchit213_connect()
+ */
+
+static void touchit213_disconnect(struct serio *serio)
+{
+        struct touchit213 *touchit213 = serio_get_drvdata(serio);
+
+        input_get_device(touchit213->dev);
+        input_unregister_device(touchit213->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(touchit213->dev);
+        kfree(touchit213);
+}
+
+/*
+ * touchit213_connect() is the routine that is called when someone adds a
+ * new serio device that supports the Touchright protocol and registers it as
+ * an input device.
+ */
+
+static int touchit213_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct touchit213 *touchit213;
+        struct input_dev *input_dev;
+        int err;
+
+        touchit213 = kzalloc(sizeof(struct touchit213), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!touchit213 || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        touchit213->serio = serio;
+        touchit213->dev = input_dev;
+        snprintf(touchit213->phys, sizeof(touchit213->phys),
+                 "%s/input0", serio->phys);
+
+        input_dev->name = "Sahara Touch-iT213 Serial TouchScreen";
+        input_dev->phys = touchit213->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_TOUCHIT213;
+        input_dev->id.product = 0;
+        input_dev->id.version = 0x0100;
+        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(touchit213->dev, ABS_X,
+                             T213_MIN_XC, T213_MAX_XC, 0, 0);
+        input_set_abs_params(touchit213->dev, ABS_Y,
+                             T213_MIN_YC, T213_MAX_YC, 0, 0);
+
+        serio_set_drvdata(serio, touchit213);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(touchit213->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(touchit213);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id touchit213_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_TOUCHIT213,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, touchit213_serio_ids);
+
+static struct serio_driver touchit213_drv = {
+        .driver         = {
+                .name   = "touchit213",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = touchit213_serio_ids,
+        .interrupt      = touchit213_interrupt,
+        .connect        = touchit213_connect,
+        .disconnect     = touchit213_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init touchit213_init(void)
+{
+        return serio_register_driver(&touchit213_drv);
+}
+
+static void __exit touchit213_exit(void)
+{
+        serio_unregister_driver(&touchit213_drv);
+}
+
+module_init(touchit213_init);
+module_exit(touchit213_exit);