diff options
Diffstat (limited to 'drivers/input/tsdev.c')
| -rw-r--r-- | drivers/input/tsdev.c | 700 |
1 files changed, 0 insertions, 700 deletions
diff --git a/drivers/input/tsdev.c b/drivers/input/tsdev.c deleted file mode 100644 index 12023349375..00000000000 --- a/drivers/input/tsdev.c +++ /dev/null @@ -1,700 +0,0 @@ -/* - * $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 The protocol emulated by this driver - * is obsolete; for new programs use the tslib library which can read directly - * from evdev and perform dejittering, variance filtering and calibration - - * all in user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); |