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-rw-r--r--drivers/input/tsdev.c443
1 files changed, 443 insertions, 0 deletions
diff --git a/drivers/input/tsdev.c b/drivers/input/tsdev.c
new file mode 100644
index 000000000000..50d238711aab
--- /dev/null
+++ b/drivers/input/tsdev.c
@@ -0,0 +1,443 @@
+/*
+ * $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
+ *
+ * Copyright (c) 2001 "Crazy" james Simmons
+ *
+ * Input driver to Touchscreen device driver module.
+ *
+ * Sponsored by Transvirtual Technology
+ */
+
+/*
+ * 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@transvirtual.com>.
+ */
+
+#define TSDEV_MINOR_BASE 128
+#define TSDEV_MINORS 32
+#define TSDEV_BUFFER_SIZE 64
+
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/config.h>
+#include <linux/smp_lock.h>
+#include <linux/random.h>
+#include <linux/time.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
+
+struct tsdev {
+ int exist;
+ int open;
+ int minor;
+ char name[16];
+ wait_queue_head_t wait;
+ struct tsdev_list *list;
+ struct input_handle handle;
+ devfs_handle_t devfs;
+};
+
+/* From Compaq's Touch Screen Specification version 0.2 (draft) */
+typedef struct {
+ short pressure;
+ short x;
+ short y;
+ short millisecs;
+} TS_EVENT;
+
+struct tsdev_list {
+ struct fasync_struct *fasync;
+ struct tsdev_list *next;
+ struct tsdev *tsdev;
+ int head, tail;
+ int oldx, oldy, pendown;
+ TS_EVENT event[TSDEV_BUFFER_SIZE];
+};
+
+static struct input_handler tsdev_handler;
+
+static struct tsdev *tsdev_table[TSDEV_MINORS];
+
+static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
+static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
+
+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 = minor(inode->i_rdev) - TSDEV_MINOR_BASE;
+ struct tsdev_list *list;
+
+ if (i >= TSDEV_MINORS || !tsdev_table[i])
+ return -ENODEV;
+
+ if (!(list = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
+ return -ENOMEM;
+ memset(list, 0, sizeof(struct tsdev_list));
+
+ list->tsdev = tsdev_table[i];
+ list->next = tsdev_table[i]->list;
+ tsdev_table[i]->list = list;
+ file->private_data = list;
+
+ if (!list->tsdev->open++)
+ if (list->tsdev->exist)
+ input_open_device(&list->tsdev->handle);
+ return 0;
+}
+
+static int tsdev_release(struct inode *inode, struct file *file)
+{
+ struct tsdev_list *list = file->private_data;
+ struct tsdev_list **listptr;
+
+ listptr = &list->tsdev->list;
+ tsdev_fasync(-1, file, 0);
+
+ while (*listptr && (*listptr != list))
+ listptr = &((*listptr)->next);
+ *listptr = (*listptr)->next;
+
+ if (!--list->tsdev->open) {
+ if (list->tsdev->exist) {
+ input_close_device(&list->tsdev->handle);
+ } else {
+ input_unregister_minor(list->tsdev->devfs);
+ tsdev_table[list->tsdev->minor] = NULL;
+ kfree(list->tsdev);
+ }
+ }
+ kfree(list);
+ return 0;
+}
+
+static ssize_t tsdev_read(struct file *file, char *buffer, size_t count,
+ loff_t * ppos)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct tsdev_list *list = file->private_data;
+ int retval = 0;
+
+ if (list->head == list->tail) {
+ add_wait_queue(&list->tsdev->wait, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ while (list->head == list->tail) {
+ if (!list->tsdev->exist) {
+ retval = -ENODEV;
+ break;
+ }
+ if (file->f_flags & O_NONBLOCK) {
+ retval = -EAGAIN;
+ break;
+ }
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+ schedule();
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&list->tsdev->wait, &wait);
+ }
+
+ if (retval)
+ return retval;
+
+ while (list->head != list->tail
+ && retval + sizeof(TS_EVENT) <= count) {
+ if (copy_to_user
+ (buffer + retval, list->event + list->tail,
+ sizeof(TS_EVENT)))
+ return -EFAULT;
+ list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
+ retval += sizeof(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);
+ if (list->head != list->tail)
+ return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+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 *evdev = list->tsdev;
+ struct input_dev *dev = tsdev->handle.dev;
+ int retval;
+
+ switch (cmd) {
+ case HHEHE:
+ return 0;
+ case hjff:
+ return 0;
+ default:
+ return 0;
+ }
+*/
+ return -EINVAL;
+}
+
+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 = tsdev->list;
+ struct timeval time;
+ int size;
+
+ while (list) {
+ switch (type) {
+ case EV_ABS:
+ switch (code) {
+ case ABS_X:
+ if (!list->pendown)
+ return;
+
+ size =
+ handle->dev->absmax[ABS_X] -
+ handle->dev->absmin[ABS_X];
+ if (size > 0)
+ list->oldx =
+ ((value -
+ handle->dev->absmin[ABS_X]) *
+ xres / size);
+ else
+ list->oldx =
+ ((value -
+ handle->dev->absmin[ABS_X]));
+ break;
+ case ABS_Y:
+ if (!list->pendown)
+ return;
+
+ size =
+ handle->dev->absmax[ABS_Y] -
+ handle->dev->absmin[ABS_Y];
+ if (size > 0)
+ list->oldy =
+ ((value -
+ handle->dev->absmin[ABS_Y]) *
+ yres / size);
+ else
+ list->oldy =
+ ((value -
+ handle->dev->absmin[ABS_Y]));
+ break;
+ case ABS_PRESSURE:
+ list->pendown =
+ ((value >
+ handle->dev->
+ absmin[ABS_PRESSURE])) ? value -
+ handle->dev->absmin[ABS_PRESSURE] : 0;
+ break;
+ }
+ break;
+
+ case EV_REL:
+ switch (code) {
+ case REL_X:
+ if (!list->pendown)
+ return;
+
+ list->oldx += value;
+ if (list->oldx < 0)
+ list->oldx = 0;
+ else if (list->oldx > xres)
+ list->oldx = xres;
+ break;
+ case REL_Y:
+ if (!list->pendown)
+ return;
+
+ list->oldy += value;
+ if (list->oldy < 0)
+ list->oldy = 0;
+ else if (list->oldy > xres)
+ list->oldy = xres;
+ break;
+ }
+ break;
+
+ case EV_KEY:
+ if (code == BTN_TOUCH || code == BTN_MOUSE) {
+ switch (value) {
+ case 0:
+ list->pendown = 0;
+ break;
+ case 1:
+ if (!list->pendown)
+ list->pendown = 1;
+ break;
+ case 2:
+ return;
+ }
+ } else
+ return;
+ break;
+ }
+ do_gettimeofday(&time);
+ list->event[list->head].millisecs = time.tv_usec / 100;
+ list->event[list->head].pressure = list->pendown;
+ list->event[list->head].x = list->oldx;
+ list->event[list->head].y = list->oldy;
+ list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
+ kill_fasync(&list->fasync, SIGIO, POLL_IN);
+ list = list->next;
+ }
+ 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;
+
+ for (minor = 0; minor < TSDEV_MINORS && tsdev_table[minor];
+ minor++);
+ if (minor == TSDEV_MINORS) {
+ 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_waitqueue_head(&tsdev->wait);
+
+ tsdev->minor = minor;
+ tsdev_table[minor] = tsdev;
+ sprintf(tsdev->name, "ts%d", minor);
+
+ tsdev->handle.dev = dev;
+ tsdev->handle.name = tsdev->name;
+ tsdev->handle.handler = handler;
+ tsdev->handle.private = tsdev;
+
+ tsdev->devfs =
+ input_register_minor("ts%d", minor, TSDEV_MINOR_BASE);
+
+ tsdev->exist = 1;
+
+ return &tsdev->handle;
+}
+
+static void tsdev_disconnect(struct input_handle *handle)
+{
+ struct tsdev *tsdev = handle->private;
+
+ tsdev->exist = 0;
+
+ if (tsdev->open) {
+ input_close_device(handle);
+ wake_up_interruptible(&tsdev->wait);
+ } else {
+ input_unregister_minor(tsdev->devfs);
+ tsdev_table[tsdev->minor] = NULL;
+ kfree(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 */
+
+ {},/* 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);
+
+MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
+MODULE_DESCRIPTION("Input driver to touchscreen converter");
+MODULE_PARM(xres, "i");
+MODULE_PARM_DESC(xres, "Horizontal screen resolution");
+MODULE_PARM(yres, "i");
+MODULE_PARM_DESC(yres, "Vertical screen resolution");
generated by cgit v1.2.3 (git 2.46.0) at 2026-01-29 15:12:12 +0000