184 lines
3.8 KiB
C
184 lines
3.8 KiB
C
/*
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* Penmount serial touchscreen driver
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*
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* Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
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*
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* Based on ELO driver (drivers/input/touchscreen/elo.c)
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* Copyright (c) 2004 Vojtech Pavlik
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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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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#include <linux/init.h>
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#define DRIVER_DESC "Penmount serial touchscreen driver"
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MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
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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 PM_MAX_LENGTH 5
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/*
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* Per-touchscreen data.
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*/
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struct pm {
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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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unsigned char data[PM_MAX_LENGTH];
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char phys[32];
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};
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static irqreturn_t pm_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct pm *pm = serio_get_drvdata(serio);
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struct input_dev *dev = pm->dev;
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pm->data[pm->idx] = data;
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if (pm->data[0] & 0x80) {
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if (PM_MAX_LENGTH == ++pm->idx) {
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input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
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input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
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input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
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input_sync(dev);
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pm->idx = 0;
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}
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}
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return IRQ_HANDLED;
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}
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/*
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* pm_disconnect() is the opposite of pm_connect()
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*/
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static void pm_disconnect(struct serio *serio)
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{
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struct pm *pm = serio_get_drvdata(serio);
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input_get_device(pm->dev);
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input_unregister_device(pm->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(pm->dev);
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kfree(pm);
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}
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/*
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* pm_connect() is the routine that is called when someone adds a
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* new serio device that supports Gunze protocol and registers it as
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* an input device.
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*/
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static int pm_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct pm *pm;
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struct input_dev *input_dev;
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int err;
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pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!pm || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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pm->serio = serio;
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pm->dev = input_dev;
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snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
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input_dev->private = pm;
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input_dev->name = "Penmount Serial TouchScreen";
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input_dev->phys = pm->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_PENMOUNT;
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input_dev->id.product = 0;
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input_dev->id.version = 0x0100;
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input_dev->cdev.dev = &serio->dev;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
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input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
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serio_set_drvdata(serio, pm);
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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(pm->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(pm);
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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 struct serio_device_id pm_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_PENMOUNT,
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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, pm_serio_ids);
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static struct serio_driver pm_drv = {
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.driver = {
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.name = "penmountlpc",
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},
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.description = DRIVER_DESC,
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.id_table = pm_serio_ids,
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.interrupt = pm_interrupt,
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.connect = pm_connect,
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.disconnect = pm_disconnect,
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};
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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init pm_init(void)
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{
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return serio_register_driver(&pm_drv);
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}
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static void __exit pm_exit(void)
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{
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serio_unregister_driver(&pm_drv);
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}
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module_init(pm_init);
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module_exit(pm_exit);
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