Messages in this thread | | | Date | Sun, 24 May 2009 09:32:23 +0200 | From | Gabriele Turchi <> | Subject | Asus eee-top touch screen |
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Hi all.
I've done some tests to use the touch screen included in the Asus eee-top PC under Fedora 10/11. From the first results, the touch screen was detected, but only the mouse button events are generated. I've googled around a bit to find a solution, but found nothing.
Looking into kernel and X sources, the more viable solution for me was to write a little kernel module, to modify a bit the event's stream to make them compatible with X needs.
My module is attached, even if I fully understand that this module could be the worst conceived and worst written ever... :-)
To be serious: my choice was to make the less invasive solution, and this module appear to reach the goal: my touch screen works well now. Maybe mine was the wrong approach, but I've found so little documentation on how to make a better one. I'll obviously accept any useful suggestion.
I hope this could be useful.
Gabriele Turchi
P.S.: Please CC me, I'm not subscribed, and my apologies for my horrible English.
/* * HID driver for TouchPack touchscreen * (ASUS eee top touch screen) * * Copyright (c) 2009 Gabriele Turchi - gabriele.turchi@l39a.com */
/* * 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. */
#include <linux/device.h> #include <linux/hid.h> #include <linux/module.h>
#include "hid-ids.h"
static int tp_input_mapping(struct hid_device *device, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { /* This is needed for evdev compatibility: these events are (apparently) never generated, but * X11 evdev driver goes mad with it. */
if ( (usage->hid & HID_USAGE_PAGE) == HID_UP_DIGITIZER) { printk(KERN_INFO "tp_input_mapping: discard HID_UP_DIGITIZER => 0x%04X\n", usage->hid); return -1; }
return 0; }
static int tp_event(struct hid_device *device, struct hid_field *field, struct hid_usage *usage, __s32 value) { /* "Somewere" the right axis number is changed with the wrong one. * Here we restore the correct values. */
if ( (usage->code == 0x02) || (usage->code == 0x03) ) usage->code -= 2; return 0; }
static const struct hid_device_id tp_devices[] = { { HID_USB_DEVICE( 0x1bfd, 0x1688) }, { } }; MODULE_DEVICE_TABLE(hid, tp_devices);
static struct hid_driver tp_driver = { .name = "touchpack", .id_table = tp_devices, .input_mapping = tp_input_mapping, .event = tp_event, };
static int tp_init(void) { return hid_register_driver(&tp_driver); }
static void tp_exit(void) { hid_unregister_driver(&tp_driver); }
module_init(tp_init); module_exit(tp_exit); MODULE_LICENSE("GPL");
HID_COMPAT_LOAD_DRIVER(touchpack); [unhandled content-type:application/x-pkcs7-signature] | |