+++ /dev/null
-/*
- * $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- * is obsolete; for new programs use the tslib library which can read directly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/random.h>
-#include <linux/time.h>
-#include <linux/device.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];
- struct input_handle handle;
- wait_queue_head_t wait;
- struct list_head client_list;
- spinlock_t client_lock; /* protects client_list */
- struct mutex mutex;
- struct device dev;
-
- int x, y, pressure;
- struct ts_calibration cal;
-};
-
-struct tsdev_client {
- struct fasync_struct *fasync;
- struct list_head node;
- struct tsdev *tsdev;
- struct ts_event buffer[TSDEV_BUFFER_SIZE];
- int head, tail;
- spinlock_t buffer_lock; /* protects access to buffer, head and tail */
- 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 tsdev *tsdev_table[TSDEV_MINORS/2];
-static DEFINE_MUTEX(tsdev_table_mutex);
-
-static int tsdev_fasync(int fd, struct file *file, int on)
-{
- struct tsdev_client *client = file->private_data;
- int retval;
-
- retval = fasync_helper(fd, file, on, &client->fasync);
-
- return retval < 0 ? retval : 0;
-}
-
-static void tsdev_free(struct device *dev)
-{
- struct tsdev *tsdev = container_of(dev, struct tsdev, dev);
-
- kfree(tsdev);
-}
-
-static void tsdev_attach_client(struct tsdev *tsdev, struct tsdev_client *client)
-{
- spin_lock(&tsdev->client_lock);
- list_add_tail_rcu(&client->node, &tsdev->client_list);
- spin_unlock(&tsdev->client_lock);
- synchronize_sched();
-}
-
-static void tsdev_detach_client(struct tsdev *tsdev, struct tsdev_client *client)
-{
- spin_lock(&tsdev->client_lock);
- list_del_rcu(&client->node);
- spin_unlock(&tsdev->client_lock);
- synchronize_sched();
-}
-
-static int tsdev_open_device(struct tsdev *tsdev)
-{
- int retval;
-
- retval = mutex_lock_interruptible(&tsdev->mutex);
- if (retval)
- return retval;
-
- if (!tsdev->exist)
- retval = -ENODEV;
- else if (!tsdev->open++) {
- retval = input_open_device(&tsdev->handle);
- if (retval)
- tsdev->open--;
- }
-
- mutex_unlock(&tsdev->mutex);
- return retval;
-}
-
-static void tsdev_close_device(struct tsdev *tsdev)
-{
- mutex_lock(&tsdev->mutex);
-
- if (tsdev->exist && !--tsdev->open)
- input_close_device(&tsdev->handle);
-
- mutex_unlock(&tsdev->mutex);
-}
-
-/*
- * Wake up users waiting for IO so they can disconnect from
- * dead device.
- */
-static void tsdev_hangup(struct tsdev *tsdev)
-{
- struct tsdev_client *client;
-
- spin_lock(&tsdev->client_lock);
- list_for_each_entry(client, &tsdev->client_list, node)
- kill_fasync(&client->fasync, SIGIO, POLL_HUP);
- spin_unlock(&tsdev->client_lock);
-
- wake_up_interruptible(&tsdev->wait);
-}
-
-static int tsdev_release(struct inode *inode, struct file *file)
-{
- struct tsdev_client *client = file->private_data;
- struct tsdev *tsdev = client->tsdev;
-
- tsdev_fasync(-1, file, 0);
- tsdev_detach_client(tsdev, client);
- kfree(client);
-
- tsdev_close_device(tsdev);
- put_device(&tsdev->dev);
-
- return 0;
-}
-
-static int tsdev_open(struct inode *inode, struct file *file)
-{
- int i = iminor(inode) - TSDEV_MINOR_BASE;
- struct tsdev_client *client;
- struct tsdev *tsdev;
- int error;
-
- printk(KERN_WARNING "tsdev (compaq touchscreen emulation) is scheduled "
- "for removal.\nSee Documentation/feature-removal-schedule.txt "
- "for details.\n");
-
- if (i >= TSDEV_MINORS)
- return -ENODEV;
-
- error = mutex_lock_interruptible(&tsdev_table_mutex);
- if (error)
- return error;
- tsdev = tsdev_table[i & TSDEV_MINOR_MASK];
- if (tsdev)
- get_device(&tsdev->dev);
- mutex_unlock(&tsdev_table_mutex);
-
- if (!tsdev)
- return -ENODEV;
-
- client = kzalloc(sizeof(struct tsdev_client), GFP_KERNEL);
- if (!client) {
- error = -ENOMEM;
- goto err_put_tsdev;
- }
-
- spin_lock_init(&client->buffer_lock);
- client->tsdev = tsdev;
- client->raw = i >= TSDEV_MINORS / 2;
- tsdev_attach_client(tsdev, client);
-
- error = tsdev_open_device(tsdev);
- if (error)
- goto err_free_client;
-
- file->private_data = client;
- return 0;
-
- err_free_client:
- tsdev_detach_client(tsdev, client);
- kfree(client);
- err_put_tsdev:
- put_device(&tsdev->dev);
- return error;
-}
-
-static int tsdev_fetch_next_event(struct tsdev_client *client,
- struct ts_event *event)
-{
- int have_event;
-
- spin_lock_irq(&client->buffer_lock);
-
- have_event = client->head != client->tail;
- if (have_event) {
- *event = client->buffer[client->tail++];
- client->tail &= TSDEV_BUFFER_SIZE - 1;
- }
-
- spin_unlock_irq(&client->buffer_lock);
-
- return have_event;
-}
-
-static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
- loff_t *ppos)
-{
- struct tsdev_client *client = file->private_data;
- struct tsdev *tsdev = client->tsdev;
- struct ts_event event;
- int retval;
-
- if (client->head == client->tail && tsdev->exist &&
- (file->f_flags & O_NONBLOCK))
- return -EAGAIN;
-
- retval = wait_event_interruptible(tsdev->wait,
- client->head != client->tail || !tsdev->exist);
- if (retval)
- return retval;
-
- if (!tsdev->exist)
- return -ENODEV;
-
- while (retval + sizeof(struct ts_event) <= count &&
- tsdev_fetch_next_event(client, &event)) {
-
- if (copy_to_user(buffer + retval, &event,
- sizeof(struct ts_event)))
- return -EFAULT;
-
- retval += sizeof(struct ts_event);
- }
-
- return retval;
-}
-
-/* No kernel lock - fine */
-static unsigned int tsdev_poll(struct file *file, poll_table *wait)
-{
- struct tsdev_client *client = file->private_data;
- struct tsdev *tsdev = client->tsdev;
-
- poll_wait(file, &tsdev->wait, wait);
- return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
- (tsdev->exist ? 0 : (POLLHUP | POLLERR));
-}
-
-static long tsdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct tsdev_client *client = file->private_data;
- struct tsdev *tsdev = client->tsdev;
- int retval = 0;
-
- retval = mutex_lock_interruptible(&tsdev->mutex);
- if (retval)
- return retval;
-
- if (!tsdev->exist) {
- retval = -ENODEV;
- goto out;
- }
-
- 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;
- }
-
- out:
- mutex_unlock(&tsdev->mutex);
- return retval;
-}
-
-static const struct file_operations tsdev_fops = {
- .owner = THIS_MODULE,
- .open = tsdev_open,
- .release = tsdev_release,
- .read = tsdev_read,
- .poll = tsdev_poll,
- .fasync = tsdev_fasync,
- .unlocked_ioctl = tsdev_ioctl,
-};
-
-static void tsdev_pass_event(struct tsdev *tsdev, struct tsdev_client *client,
- int x, int y, int pressure, int millisecs)
-{
- struct ts_event *event;
- int tmp;
-
- /* Interrupts are already disabled, just acquire the lock */
- spin_lock(&client->buffer_lock);
-
- event = &client->buffer[client->head++];
- client->head &= TSDEV_BUFFER_SIZE - 1;
-
- /* Calibration */
- if (!client->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;
- }
- }
-
- event->millisecs = millisecs;
- event->x = x;
- event->y = y;
- event->pressure = pressure;
-
- spin_unlock(&client->buffer_lock);
-
- kill_fasync(&client->fasync, SIGIO, POLL_IN);
-}
-
-static void tsdev_distribute_event(struct tsdev *tsdev)
-{
- struct tsdev_client *client;
- struct timeval time;
- int millisecs;
-
- do_gettimeofday(&time);
- millisecs = time.tv_usec / 1000;
-
- list_for_each_entry_rcu(client, &tsdev->client_list, node)
- tsdev_pass_event(tsdev, client,
- tsdev->x, tsdev->y,
- tsdev->pressure, millisecs);
-}
-
-static void tsdev_event(struct input_handle *handle, unsigned int type,
- unsigned int code, int value)
-{
- struct tsdev *tsdev = handle->private;
- struct input_dev *dev = handle->dev;
- int wake_up_readers = 0;
-
- 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 > dev->absmax[ABS_PRESSURE])
- value = dev->absmax[ABS_PRESSURE];
- value -= 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;
-
- case EV_SYN:
- if (code == SYN_REPORT) {
- tsdev_distribute_event(tsdev);
- wake_up_readers = 1;
- }
- break;
- }
-
- if (wake_up_readers)
- wake_up_interruptible(&tsdev->wait);
-}
-
-static int tsdev_install_chrdev(struct tsdev *tsdev)
-{
- tsdev_table[tsdev->minor] = tsdev;
- return 0;
-}
-
-static void tsdev_remove_chrdev(struct tsdev *tsdev)
-{
- mutex_lock(&tsdev_table_mutex);
- tsdev_table[tsdev->minor] = NULL;
- mutex_unlock(&tsdev_table_mutex);
-}
-
-/*
- * Mark device non-existant. This disables writes, ioctls and
- * prevents new users from opening the device. Already posted
- * blocking reads will stay, however new ones will fail.
- */
-static void tsdev_mark_dead(struct tsdev *tsdev)
-{
- mutex_lock(&tsdev->mutex);
- tsdev->exist = 0;
- mutex_unlock(&tsdev->mutex);
-}
-
-static void tsdev_cleanup(struct tsdev *tsdev)
-{
- struct input_handle *handle = &tsdev->handle;
-
- tsdev_mark_dead(tsdev);
- tsdev_hangup(tsdev);
- tsdev_remove_chrdev(tsdev);
-
- /* tsdev is marked dead so noone else accesses tsdev->open */
- if (tsdev->open)
- input_close_device(handle);
-}
-
-static int tsdev_connect(struct input_handler *handler, struct input_dev *dev,
- const struct input_device_id *id)
-{
- struct tsdev *tsdev;
- int delta;
- int minor;
- int error;
-
- for (minor = 0; minor < TSDEV_MINORS / 2; minor++)
- if (!tsdev_table[minor])
- break;
-
- if (minor == TSDEV_MINORS) {
- printk(KERN_ERR "tsdev: no more free tsdev devices\n");
- return -ENFILE;
- }
-
- tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL);
- if (!tsdev)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&tsdev->client_list);
- spin_lock_init(&tsdev->client_lock);
- mutex_init(&tsdev->mutex);
- init_waitqueue_head(&tsdev->wait);
-
- snprintf(tsdev->name, sizeof(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);
-
- strlcpy(tsdev->dev.bus_id, tsdev->name, sizeof(tsdev->dev.bus_id));
- tsdev->dev.devt = MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor);
- tsdev->dev.class = &input_class;
- tsdev->dev.parent = &dev->dev;
- tsdev->dev.release = tsdev_free;
- device_initialize(&tsdev->dev);
-
- error = input_register_handle(&tsdev->handle);
- if (error)
- goto err_free_tsdev;
-
- error = tsdev_install_chrdev(tsdev);
- if (error)
- goto err_unregister_handle;
-
- error = device_add(&tsdev->dev);
- if (error)
- goto err_cleanup_tsdev;
-
- return 0;
-
- err_cleanup_tsdev:
- tsdev_cleanup(tsdev);
- err_unregister_handle:
- input_unregister_handle(&tsdev->handle);
- err_free_tsdev:
- put_device(&tsdev->dev);
- return error;
-}
-
-static void tsdev_disconnect(struct input_handle *handle)
-{
- struct tsdev *tsdev = handle->private;
-
- device_del(&tsdev->dev);
- tsdev_cleanup(tsdev);
- input_unregister_handle(handle);
- put_device(&tsdev->dev);
-}
-
-static const 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)
-{
- return input_register_handler(&tsdev_handler);
-}
-
-static void __exit tsdev_exit(void)
-{
- input_unregister_handler(&tsdev_handler);
-}
-
-module_init(tsdev_init);
-module_exit(tsdev_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff