111ea3173SRick Koch /* 211ea3173SRick Koch * Touchwindow serial touchscreen driver 311ea3173SRick Koch * 411ea3173SRick Koch * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> 511ea3173SRick Koch * 611ea3173SRick Koch * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) 711ea3173SRick Koch * Copyright (c) 2004 Vojtech Pavlik 811ea3173SRick Koch * and Dan Streetman <ddstreet@ieee.org> 911ea3173SRick Koch */ 1011ea3173SRick Koch 1111ea3173SRick Koch /* 1211ea3173SRick Koch * This program is free software; you can redistribute it and/or modify it 1311ea3173SRick Koch * under the terms of the GNU General Public License version 2 as published 1411ea3173SRick Koch * by the Free Software Foundation. 1511ea3173SRick Koch */ 1611ea3173SRick Koch 1711ea3173SRick Koch /* 1811ea3173SRick Koch * 2005/02/19 Rick Koch: 1911ea3173SRick Koch * The Touchwindow I used is made by Edmark Corp. and 2011ea3173SRick Koch * constantly outputs a stream of 0's unless it is touched. 2111ea3173SRick Koch * It then outputs 3 bytes: X, Y, and a copy of Y. 2211ea3173SRick Koch */ 2311ea3173SRick Koch 2411ea3173SRick Koch #include <linux/errno.h> 2511ea3173SRick Koch #include <linux/kernel.h> 2611ea3173SRick Koch #include <linux/module.h> 2711ea3173SRick Koch #include <linux/slab.h> 2811ea3173SRick Koch #include <linux/input.h> 2911ea3173SRick Koch #include <linux/serio.h> 3011ea3173SRick Koch #include <linux/init.h> 3111ea3173SRick Koch 3211ea3173SRick Koch #define DRIVER_DESC "Touchwindow serial touchscreen driver" 3311ea3173SRick Koch 3411ea3173SRick Koch MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); 3511ea3173SRick Koch MODULE_DESCRIPTION(DRIVER_DESC); 3611ea3173SRick Koch MODULE_LICENSE("GPL"); 3711ea3173SRick Koch 3811ea3173SRick Koch /* 3911ea3173SRick Koch * Definitions & global arrays. 4011ea3173SRick Koch */ 4111ea3173SRick Koch 4211ea3173SRick Koch #define TW_LENGTH 3 4311ea3173SRick Koch 4411ea3173SRick Koch #define TW_MIN_XC 0 4511ea3173SRick Koch #define TW_MAX_XC 0xff 4611ea3173SRick Koch #define TW_MIN_YC 0 4711ea3173SRick Koch #define TW_MAX_YC 0xff 4811ea3173SRick Koch 4911ea3173SRick Koch /* 5011ea3173SRick Koch * Per-touchscreen data. 5111ea3173SRick Koch */ 5211ea3173SRick Koch 5311ea3173SRick Koch struct tw { 5411ea3173SRick Koch struct input_dev *dev; 5511ea3173SRick Koch struct serio *serio; 5611ea3173SRick Koch int idx; 5711ea3173SRick Koch int touched; 5811ea3173SRick Koch unsigned char data[TW_LENGTH]; 5911ea3173SRick Koch char phys[32]; 6011ea3173SRick Koch }; 6111ea3173SRick Koch 6211ea3173SRick Koch static irqreturn_t tw_interrupt(struct serio *serio, 637d12e780SDavid Howells unsigned char data, unsigned int flags) 6411ea3173SRick Koch { 6511ea3173SRick Koch struct tw *tw = serio_get_drvdata(serio); 6611ea3173SRick Koch struct input_dev *dev = tw->dev; 6711ea3173SRick Koch 6811ea3173SRick Koch if (data) { /* touch */ 6911ea3173SRick Koch tw->touched = 1; 7011ea3173SRick Koch tw->data[tw->idx++] = data; 7111ea3173SRick Koch /* verify length and that the two Y's are the same */ 7211ea3173SRick Koch if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { 7311ea3173SRick Koch input_report_abs(dev, ABS_X, tw->data[0]); 7411ea3173SRick Koch input_report_abs(dev, ABS_Y, tw->data[1]); 7511ea3173SRick Koch input_report_key(dev, BTN_TOUCH, 1); 7611ea3173SRick Koch input_sync(dev); 7711ea3173SRick Koch tw->idx = 0; 7811ea3173SRick Koch } 7911ea3173SRick Koch } else if (tw->touched) { /* untouch */ 8011ea3173SRick Koch input_report_key(dev, BTN_TOUCH, 0); 8111ea3173SRick Koch input_sync(dev); 8211ea3173SRick Koch tw->idx = 0; 8311ea3173SRick Koch tw->touched = 0; 8411ea3173SRick Koch } 8511ea3173SRick Koch 8611ea3173SRick Koch return IRQ_HANDLED; 8711ea3173SRick Koch } 8811ea3173SRick Koch 8911ea3173SRick Koch /* 9011ea3173SRick Koch * tw_disconnect() is the opposite of tw_connect() 9111ea3173SRick Koch */ 9211ea3173SRick Koch 9311ea3173SRick Koch static void tw_disconnect(struct serio *serio) 9411ea3173SRick Koch { 9511ea3173SRick Koch struct tw *tw = serio_get_drvdata(serio); 9611ea3173SRick Koch 9711ea3173SRick Koch input_get_device(tw->dev); 9811ea3173SRick Koch input_unregister_device(tw->dev); 9911ea3173SRick Koch serio_close(serio); 10011ea3173SRick Koch serio_set_drvdata(serio, NULL); 10111ea3173SRick Koch input_put_device(tw->dev); 10211ea3173SRick Koch kfree(tw); 10311ea3173SRick Koch } 10411ea3173SRick Koch 10511ea3173SRick Koch /* 10611ea3173SRick Koch * tw_connect() is the routine that is called when someone adds a 10711ea3173SRick Koch * new serio device that supports the Touchwin protocol and registers it as 10811ea3173SRick Koch * an input device. 10911ea3173SRick Koch */ 11011ea3173SRick Koch 11111ea3173SRick Koch static int tw_connect(struct serio *serio, struct serio_driver *drv) 11211ea3173SRick Koch { 11311ea3173SRick Koch struct tw *tw; 11411ea3173SRick Koch struct input_dev *input_dev; 11511ea3173SRick Koch int err; 11611ea3173SRick Koch 11711ea3173SRick Koch tw = kzalloc(sizeof(struct tw), GFP_KERNEL); 11811ea3173SRick Koch input_dev = input_allocate_device(); 11911ea3173SRick Koch if (!tw || !input_dev) { 12011ea3173SRick Koch err = -ENOMEM; 12111ea3173SRick Koch goto fail1; 12211ea3173SRick Koch } 12311ea3173SRick Koch 12411ea3173SRick Koch tw->serio = serio; 12511ea3173SRick Koch tw->dev = input_dev; 12611ea3173SRick Koch snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys); 12711ea3173SRick Koch 12811ea3173SRick Koch input_dev->private = tw; 12911ea3173SRick Koch input_dev->name = "Touchwindow Serial TouchScreen"; 13011ea3173SRick Koch input_dev->phys = tw->phys; 13111ea3173SRick Koch input_dev->id.bustype = BUS_RS232; 13211ea3173SRick Koch input_dev->id.vendor = SERIO_TOUCHWIN; 13311ea3173SRick Koch input_dev->id.product = 0; 13411ea3173SRick Koch input_dev->id.version = 0x0100; 13511ea3173SRick Koch input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 13611ea3173SRick Koch input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 13711ea3173SRick Koch input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); 13811ea3173SRick Koch input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0); 13911ea3173SRick Koch 14011ea3173SRick Koch serio_set_drvdata(serio, tw); 14111ea3173SRick Koch 14211ea3173SRick Koch err = serio_open(serio, drv); 14311ea3173SRick Koch if (err) 14411ea3173SRick Koch goto fail2; 14511ea3173SRick Koch 14611ea3173SRick Koch err = input_register_device(tw->dev); 14711ea3173SRick Koch if (err) 14811ea3173SRick Koch goto fail3; 14911ea3173SRick Koch 15011ea3173SRick Koch return 0; 15111ea3173SRick Koch 15211ea3173SRick Koch fail3: serio_close(serio); 15311ea3173SRick Koch fail2: serio_set_drvdata(serio, NULL); 15411ea3173SRick Koch fail1: input_free_device(input_dev); 15511ea3173SRick Koch kfree(tw); 15611ea3173SRick Koch return err; 15711ea3173SRick Koch } 15811ea3173SRick Koch 15911ea3173SRick Koch /* 16011ea3173SRick Koch * The serio driver structure. 16111ea3173SRick Koch */ 16211ea3173SRick Koch 16311ea3173SRick Koch static struct serio_device_id tw_serio_ids[] = { 16411ea3173SRick Koch { 16511ea3173SRick Koch .type = SERIO_RS232, 16611ea3173SRick Koch .proto = SERIO_TOUCHWIN, 16711ea3173SRick Koch .id = SERIO_ANY, 16811ea3173SRick Koch .extra = SERIO_ANY, 16911ea3173SRick Koch }, 17011ea3173SRick Koch { 0 } 17111ea3173SRick Koch }; 17211ea3173SRick Koch 17311ea3173SRick Koch MODULE_DEVICE_TABLE(serio, tw_serio_ids); 17411ea3173SRick Koch 17511ea3173SRick Koch static struct serio_driver tw_drv = { 17611ea3173SRick Koch .driver = { 17711ea3173SRick Koch .name = "touchwin", 17811ea3173SRick Koch }, 17911ea3173SRick Koch .description = DRIVER_DESC, 18011ea3173SRick Koch .id_table = tw_serio_ids, 18111ea3173SRick Koch .interrupt = tw_interrupt, 18211ea3173SRick Koch .connect = tw_connect, 18311ea3173SRick Koch .disconnect = tw_disconnect, 18411ea3173SRick Koch }; 18511ea3173SRick Koch 18611ea3173SRick Koch /* 18711ea3173SRick Koch * The functions for inserting/removing us as a module. 18811ea3173SRick Koch */ 18911ea3173SRick Koch 19011ea3173SRick Koch static int __init tw_init(void) 19111ea3173SRick Koch { 192153a9df0SAkinobu Mita return serio_register_driver(&tw_drv); 19311ea3173SRick Koch } 19411ea3173SRick Koch 19511ea3173SRick Koch static void __exit tw_exit(void) 19611ea3173SRick Koch { 19711ea3173SRick Koch serio_unregister_driver(&tw_drv); 19811ea3173SRick Koch } 19911ea3173SRick Koch 20011ea3173SRick Koch module_init(tw_init); 20111ea3173SRick Koch module_exit(tw_exit); 202