| /* |
| * $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| * is obsolete; for new programs use the tslib library which can read directly |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/smp_lock.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]; |
| 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 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 = kzalloc(sizeof(struct tsdev_list), GFP_KERNEL))) |
| return -ENOMEM; |
| |
| 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 const 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, |
| const struct input_device_id *id) |
| { |
| struct tsdev *tsdev; |
| struct class_device *cdev; |
| 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 = kzalloc(sizeof(struct tsdev), GFP_KERNEL))) |
| return NULL; |
| |
| 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; |
| |
| cdev = class_device_create(&input_class, &dev->cdev, |
| MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor), |
| dev->cdev.dev, tsdev->name); |
| |
| /* temporary symlink to keep userspace happy */ |
| sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, |
| tsdev->name); |
| |
| return &tsdev->handle; |
| } |
| |
| static void tsdev_disconnect(struct input_handle *handle) |
| { |
| struct tsdev *tsdev = handle->private; |
| struct tsdev_list *list; |
| |
| sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name); |
| class_device_destroy(&input_class, |
| MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + 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 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); |