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