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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185// SPDX-License-Identifier: GPL-2.0-only/* * Touchwindow serial touchscreen driver * * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> * * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) * Copyright (c) 2004 Vojtech Pavlik * and Dan Streetman <ddstreet@ieee.org> */
/* * 2005/02/19 Rick Koch: * The Touchwindow I used is made by Edmark Corp. and * constantly outputs a stream of 0's unless it is touched. * It then outputs 3 bytes: X, Y, and a copy of Y. */
#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/serio.h>
#define DRIVER_DESC "Touchwindow serial touchscreen driver"
MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");
/* * Definitions & global arrays. */
#define TW_LENGTH 3
#define TW_MIN_XC 0#define TW_MAX_XC 0xff#define TW_MIN_YC 0#define TW_MAX_YC 0xff
/* * Per-touchscreen data. */
struct tw { struct input_dev *dev; struct serio *serio; int idx; int touched; unsigned char data[TW_LENGTH]; char phys[32];};
static irqreturn_t tw_interrupt(struct serio *serio, unsigned char data, unsigned int flags){ struct tw *tw = serio_get_drvdata(serio); struct input_dev *dev = tw->dev;
if (data) { /* touch */ tw->touched = 1; tw->data[tw->idx++] = data; /* a full packet ends the accumulation, valid or not */ if (tw->idx == TW_LENGTH) { /* report only if the two Y's are the same */ if (tw->data[1] == tw->data[2]) { input_report_abs(dev, ABS_X, tw->data[0]); input_report_abs(dev, ABS_Y, tw->data[1]); input_report_key(dev, BTN_TOUCH, 1); input_sync(dev); } tw->idx = 0; } } else if (tw->touched) { /* untouch */ input_report_key(dev, BTN_TOUCH, 0); input_sync(dev); tw->idx = 0; tw->touched = 0; }
return IRQ_HANDLED;}
/* * tw_disconnect() is the opposite of tw_connect() */
static void tw_disconnect(struct serio *serio){ struct tw *tw = serio_get_drvdata(serio);
input_get_device(tw->dev); input_unregister_device(tw->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(tw->dev); kfree(tw);}
/* * tw_connect() is the routine that is called when someone adds a * new serio device that supports the Touchwin protocol and registers it as * an input device. */
static int tw_connect(struct serio *serio, struct serio_driver *drv){ struct tw *tw; struct input_dev *input_dev; int err;
tw = kzalloc_obj(*tw); input_dev = input_allocate_device(); if (!tw || !input_dev) { err = -ENOMEM; goto fail1; }
tw->serio = serio; tw->dev = input_dev; scnprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
input_dev->name = "Touchwindow Serial TouchScreen"; input_dev->phys = tw->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_TOUCHWIN; input_dev->id.product = 0; input_dev->id.version = 0x0100; input_dev->dev.parent = &serio->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
serio_set_drvdata(serio, tw);
err = serio_open(serio, drv); if (err) goto fail2;
err = input_register_device(tw->dev); if (err) goto fail3;
return 0;
fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(tw); return err;}
/* * The serio driver structure. */
static const struct serio_device_id tw_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_TOUCHWIN, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 }};
MODULE_DEVICE_TABLE(serio, tw_serio_ids);
static struct serio_driver tw_drv = { .driver = { .name = "touchwin", }, .description = DRIVER_DESC, .id_table = tw_serio_ids, .interrupt = tw_interrupt, .connect = tw_connect, .disconnect = tw_disconnect,};
module_serio_driver(tw_drv);