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