/* * $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 The protocol emulated by this driver * is obsolete; for new programs use the tslib library which can read directly * from evdev and perform dejittering, variance filtering and calibration - * all in user space,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);