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-rw-r--r--drivers/input/tsdev.c492
1 files changed, 492 insertions, 0 deletions
diff --git a/drivers/input/tsdev.c b/drivers/input/tsdev.c
new file mode 100644
index 00000000000..d0afba85720
--- /dev/null
+++ b/drivers/input/tsdev.c
@@ -0,0 +1,492 @@
+/*
+ * $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
+ *
+ * Copyright (c) 2001 "Crazy" james Simmons
+ *
+ * Compaq touchscreen protocol driver. The protocol emulated by this driver
+ * is obsolete; for new programs use the tslib library which can read directly
+ * from evdev and perform dejittering, variance filtering and calibration -
+ * all in user space, not at kernel level. The meaning of this driver is
+ * to allow usage of newer input drivers with old applications that use the
+ * old /dev/h3600_ts and /dev/h3600_tsraw devices.
+ *
+ * 09-Apr-2004: Andrew Zabolotny <zap@homelink.ru>
+ * Fixed to actually work, not just output random numbers.
+ * Added support for both h3600_ts and h3600_tsraw protocol
+ * emulation.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so either by
+ * e-mail - mail your message to <jsimmons@infradead.org>.
+ */
+
+#define TSDEV_MINOR_BASE 128
+#define TSDEV_MINORS 32
+/* First 16 devices are h3600_ts compatible; second 16 are h3600_tsraw */
+#define TSDEV_MINOR_MASK 15
+#define TSDEV_BUFFER_SIZE 64
+
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/major.h>
+#include <linux/config.h>
+#include <linux/smp_lock.h>
+#include <linux/random.h>
+#include <linux/time.h>
+#include <linux/device.h>
+#include <linux/devfs_fs_kernel.h>
+
+#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
+#define CONFIG_INPUT_TSDEV_SCREEN_X 240
+#endif
+#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
+#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
+#endif
+
+/* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
+ * devices. The first one must output X/Y data in 'cooked' format, e.g.
+ * filtered, dejittered and calibrated. Second device just outputs raw
+ * data received from the hardware.
+ *
+ * This driver doesn't support filtering and dejittering; it supports only
+ * calibration. Filtering and dejittering must be done in the low-level
+ * driver, if needed, because it may gain additional benefits from knowing
+ * the low-level details, the nature of noise and so on.
+ *
+ * The driver precomputes a calibration matrix given the initial xres and
+ * yres values (quite innacurate for most touchscreens) that will result
+ * in a more or less expected range of output values. The driver supports
+ * the TS_SET_CAL ioctl, which will replace the calibration matrix with a
+ * new one, supposedly generated from the values taken from the raw device.
+ */
+
+MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
+MODULE_DESCRIPTION("Input driver to touchscreen converter");
+MODULE_LICENSE("GPL");
+
+static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
+module_param(xres, uint, 0);
+MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
+
+static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
+module_param(yres, uint, 0);
+MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
+
+/* From Compaq's Touch Screen Specification version 0.2 (draft) */
+struct ts_event {
+ short pressure;
+ short x;
+ short y;
+ short millisecs;
+};
+
+struct ts_calibration {
+ int xscale;
+ int xtrans;
+ int yscale;
+ int ytrans;
+ int xyswap;
+};
+
+struct tsdev {
+ int exist;
+ int open;
+ int minor;
+ char name[8];
+ wait_queue_head_t wait;
+ struct list_head list;
+ struct input_handle handle;
+ int x, y, pressure;
+ struct ts_calibration cal;
+};
+
+struct tsdev_list {
+ struct fasync_struct *fasync;
+ struct list_head node;
+ struct tsdev *tsdev;
+ int head, tail;
+ struct ts_event event[TSDEV_BUFFER_SIZE];
+ int raw;
+};
+
+/* The following ioctl codes are defined ONLY for backward compatibility.
+ * Don't use tsdev for new developement; use the tslib library instead.
+ * Touchscreen calibration is a fully userspace task.
+ */
+/* Use 'f' as magic number */
+#define IOC_H3600_TS_MAGIC 'f'
+#define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
+#define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
+
+static struct input_handler tsdev_handler;
+
+static struct tsdev *tsdev_table[TSDEV_MINORS/2];
+
+static int tsdev_fasync(int fd, struct file *file, int on)
+{
+ struct tsdev_list *list = file->private_data;
+ int retval;
+
+ retval = fasync_helper(fd, file, on, &list->fasync);
+ return retval < 0 ? retval : 0;
+}
+
+static int tsdev_open(struct inode *inode, struct file *file)
+{
+ int i = iminor(inode) - TSDEV_MINOR_BASE;
+ struct tsdev_list *list;
+
+ if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
+ return -ENODEV;
+
+ if (!(list = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
+ return -ENOMEM;
+ memset(list, 0, sizeof(struct tsdev_list));
+
+ list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
+
+ i &= TSDEV_MINOR_MASK;
+ list->tsdev = tsdev_table[i];
+ list_add_tail(&list->node, &tsdev_table[i]->list);
+ file->private_data = list;
+
+ if (!list->tsdev->open++)
+ if (list->tsdev->exist)
+ input_open_device(&list->tsdev->handle);
+ return 0;
+}
+
+static void tsdev_free(struct tsdev *tsdev)
+{
+ tsdev_table[tsdev->minor] = NULL;
+ kfree(tsdev);
+}
+
+static int tsdev_release(struct inode *inode, struct file *file)
+{
+ struct tsdev_list *list = file->private_data;
+
+ tsdev_fasync(-1, file, 0);
+ list_del(&list->node);
+
+ if (!--list->tsdev->open) {
+ if (list->tsdev->exist)
+ input_close_device(&list->tsdev->handle);
+ else
+ tsdev_free(list->tsdev);
+ }
+ kfree(list);
+ return 0;
+}
+
+static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
+ loff_t * ppos)
+{
+ struct tsdev_list *list = file->private_data;
+ int retval = 0;
+
+ if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
+ return -EAGAIN;
+
+ retval = wait_event_interruptible(list->tsdev->wait,
+ list->head != list->tail || !list->tsdev->exist);
+
+ if (retval)
+ return retval;
+
+ if (!list->tsdev->exist)
+ return -ENODEV;
+
+ while (list->head != list->tail &&
+ retval + sizeof (struct ts_event) <= count) {
+ if (copy_to_user (buffer + retval, list->event + list->tail,
+ sizeof (struct ts_event)))
+ return -EFAULT;
+ list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
+ retval += sizeof (struct ts_event);
+ }
+
+ return retval;
+}
+
+/* No kernel lock - fine */
+static unsigned int tsdev_poll(struct file *file, poll_table * wait)
+{
+ struct tsdev_list *list = file->private_data;
+ poll_wait(file, &list->tsdev->wait, wait);
+ return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
+ (list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
+}
+
+static int tsdev_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct tsdev_list *list = file->private_data;
+ struct tsdev *tsdev = list->tsdev;
+ int retval = 0;
+
+ switch (cmd) {
+ case TS_GET_CAL:
+ if (copy_to_user ((void __user *)arg, &tsdev->cal,
+ sizeof (struct ts_calibration)))
+ retval = -EFAULT;
+ break;
+ case TS_SET_CAL:
+ if (copy_from_user (&tsdev->cal, (void __user *)arg,
+ sizeof (struct ts_calibration)))
+ retval = -EFAULT;
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ return retval;
+}
+
+static struct file_operations tsdev_fops = {
+ .owner = THIS_MODULE,
+ .open = tsdev_open,
+ .release = tsdev_release,
+ .read = tsdev_read,
+ .poll = tsdev_poll,
+ .fasync = tsdev_fasync,
+ .ioctl = tsdev_ioctl,
+};
+
+static void tsdev_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int value)
+{
+ struct tsdev *tsdev = handle->private;
+ struct tsdev_list *list;
+ struct timeval time;
+
+ switch (type) {
+ case EV_ABS:
+ switch (code) {
+ case ABS_X:
+ tsdev->x = value;
+ break;
+ case ABS_Y:
+ tsdev->y = value;
+ break;
+ case ABS_PRESSURE:
+ if (value > handle->dev->absmax[ABS_PRESSURE])
+ value = handle->dev->absmax[ABS_PRESSURE];
+ value -= handle->dev->absmin[ABS_PRESSURE];
+ if (value < 0)
+ value = 0;
+ tsdev->pressure = value;
+ break;
+ }
+ break;
+
+ case EV_REL:
+ switch (code) {
+ case REL_X:
+ tsdev->x += value;
+ if (tsdev->x < 0)
+ tsdev->x = 0;
+ else if (tsdev->x > xres)
+ tsdev->x = xres;
+ break;
+ case REL_Y:
+ tsdev->y += value;
+ if (tsdev->y < 0)
+ tsdev->y = 0;
+ else if (tsdev->y > yres)
+ tsdev->y = yres;
+ break;
+ }
+ break;
+
+ case EV_KEY:
+ if (code == BTN_TOUCH || code == BTN_MOUSE) {
+ switch (value) {
+ case 0:
+ tsdev->pressure = 0;
+ break;
+ case 1:
+ if (!tsdev->pressure)
+ tsdev->pressure = 1;
+ break;
+ }
+ }
+ break;
+ }
+
+ if (type != EV_SYN || code != SYN_REPORT)
+ return;
+
+ list_for_each_entry(list, &tsdev->list, node) {
+ int x, y, tmp;
+
+ do_gettimeofday(&time);
+ list->event[list->head].millisecs = time.tv_usec / 100;
+ list->event[list->head].pressure = tsdev->pressure;
+
+ x = tsdev->x;
+ y = tsdev->y;
+
+ /* Calibration */
+ if (!list->raw) {
+ x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
+ y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
+ if (tsdev->cal.xyswap) {
+ tmp = x; x = y; y = tmp;
+ }
+ }
+
+ list->event[list->head].x = x;
+ list->event[list->head].y = y;
+ list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
+ kill_fasync(&list->fasync, SIGIO, POLL_IN);
+ }
+ wake_up_interruptible(&tsdev->wait);
+}
+
+static struct input_handle *tsdev_connect(struct input_handler *handler,
+ struct input_dev *dev,
+ struct input_device_id *id)
+{
+ struct tsdev *tsdev;
+ int minor, delta;
+
+ for (minor = 0; minor < TSDEV_MINORS/2 && tsdev_table[minor];
+ minor++);
+ if (minor >= TSDEV_MINORS/2) {
+ printk(KERN_ERR
+ "tsdev: You have way too many touchscreens\n");
+ return NULL;
+ }
+
+ if (!(tsdev = kmalloc(sizeof(struct tsdev), GFP_KERNEL)))
+ return NULL;
+ memset(tsdev, 0, sizeof(struct tsdev));
+
+ INIT_LIST_HEAD(&tsdev->list);
+ init_waitqueue_head(&tsdev->wait);
+
+ sprintf(tsdev->name, "ts%d", minor);
+
+ tsdev->exist = 1;
+ tsdev->minor = minor;
+ tsdev->handle.dev = dev;
+ tsdev->handle.name = tsdev->name;
+ tsdev->handle.handler = handler;
+ tsdev->handle.private = tsdev;
+
+ /* Precompute the rough calibration matrix */
+ delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
+ if (delta == 0)
+ delta = 1;
+ tsdev->cal.xscale = (xres << 8) / delta;
+ tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
+
+ delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
+ if (delta == 0)
+ delta = 1;
+ tsdev->cal.yscale = (yres << 8) / delta;
+ tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
+
+ tsdev_table[minor] = tsdev;
+
+ devfs_mk_cdev(MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
+ S_IFCHR|S_IRUGO|S_IWUSR, "input/ts%d", minor);
+ devfs_mk_cdev(MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor + TSDEV_MINORS/2),
+ S_IFCHR|S_IRUGO|S_IWUSR, "input/tsraw%d", minor);
+ class_simple_device_add(input_class,
+ MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
+ dev->dev, "ts%d", minor);
+
+ return &tsdev->handle;
+}
+
+static void tsdev_disconnect(struct input_handle *handle)
+{
+ struct tsdev *tsdev = handle->private;
+ struct tsdev_list *list;
+
+ class_simple_device_remove(MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
+ devfs_remove("input/ts%d", tsdev->minor);
+ devfs_remove("input/tsraw%d", tsdev->minor);
+ tsdev->exist = 0;
+
+ if (tsdev->open) {
+ input_close_device(handle);
+ wake_up_interruptible(&tsdev->wait);
+ list_for_each_entry(list, &tsdev->list, node)
+ kill_fasync(&list->fasync, SIGIO, POLL_HUP);
+ } else
+ tsdev_free(tsdev);
+}
+
+static struct input_device_id tsdev_ids[] = {
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
+ .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
+ .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
+ .relbit = { BIT(REL_X) | BIT(REL_Y) },
+ },/* A mouse like device, at least one button, two relative axes */
+
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
+ .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
+ .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
+ .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
+ },/* A tablet like device, at least touch detection, two absolute axes */
+
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
+ .evbit = { BIT(EV_ABS) },
+ .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
+ },/* A tablet like device with several gradations of pressure */
+
+ {},/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(input, tsdev_ids);
+
+static struct input_handler tsdev_handler = {
+ .event = tsdev_event,
+ .connect = tsdev_connect,
+ .disconnect = tsdev_disconnect,
+ .fops = &tsdev_fops,
+ .minor = TSDEV_MINOR_BASE,
+ .name = "tsdev",
+ .id_table = tsdev_ids,
+};
+
+static int __init tsdev_init(void)
+{
+ input_register_handler(&tsdev_handler);
+ printk(KERN_INFO "ts: Compaq touchscreen protocol output\n");
+ return 0;
+}
+
+static void __exit tsdev_exit(void)
+{
+ input_unregister_handler(&tsdev_handler);
+}
+
+module_init(tsdev_init);
+module_exit(tsdev_exit);
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