190 lines
4.7 KiB
C
190 lines
4.7 KiB
C
/*
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* Hampshire serial touchscreen driver
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*
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* Copyright (c) 2010 Adam Bennett
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* Based on the dynapro driver (c) Tias Guns
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*
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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 by
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* the Free Software Foundation.
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*/
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/*
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* 2010/04/08 Adam Bennett <abennett72@gmail.com>
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* Copied dynapro.c and edited for Hampshire 4-byte protocol
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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 "Hampshire serial touchscreen driver"
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MODULE_AUTHOR("Adam Bennett <abennett72@gmail.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 HAMPSHIRE_FORMAT_TOUCH_BIT 0x40
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#define HAMPSHIRE_FORMAT_LENGTH 4
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#define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80
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#define HAMPSHIRE_MIN_XC 0
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#define HAMPSHIRE_MAX_XC 0x1000
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#define HAMPSHIRE_MIN_YC 0
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#define HAMPSHIRE_MAX_YC 0x1000
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#define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6))
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#define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9))
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#define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0])
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/*
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* Per-touchscreen data.
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*/
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struct hampshire {
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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[HAMPSHIRE_FORMAT_LENGTH];
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char phys[32];
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};
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static void hampshire_process_data(struct hampshire *phampshire)
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{
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struct input_dev *dev = phampshire->dev;
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if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) {
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input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data));
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input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data));
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input_report_key(dev, BTN_TOUCH,
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HAMPSHIRE_GET_TOUCHED(phampshire->data));
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input_sync(dev);
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phampshire->idx = 0;
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}
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}
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static irqreturn_t hampshire_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct hampshire *phampshire = serio_get_drvdata(serio);
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phampshire->data[phampshire->idx] = data;
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if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0])
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hampshire_process_data(phampshire);
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else
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dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
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phampshire->data[0]);
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return IRQ_HANDLED;
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}
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static void hampshire_disconnect(struct serio *serio)
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{
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struct hampshire *phampshire = serio_get_drvdata(serio);
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input_get_device(phampshire->dev);
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input_unregister_device(phampshire->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(phampshire->dev);
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kfree(phampshire);
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}
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/*
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* hampshire_connect() is the routine that is called when someone adds a
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* new serio device that supports hampshire protocol and registers it as
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* an input device. This is usually accomplished using inputattach.
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*/
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static int hampshire_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct hampshire *phampshire;
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struct input_dev *input_dev;
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int err;
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phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!phampshire || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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phampshire->serio = serio;
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phampshire->dev = input_dev;
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snprintf(phampshire->phys, sizeof(phampshire->phys),
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"%s/input0", serio->phys);
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input_dev->name = "Hampshire Serial TouchScreen";
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input_dev->phys = phampshire->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_HAMPSHIRE;
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input_dev->id.product = 0;
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input_dev->id.version = 0x0001;
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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(phampshire->dev, ABS_X,
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HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0);
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input_set_abs_params(phampshire->dev, ABS_Y,
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HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0);
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serio_set_drvdata(serio, phampshire);
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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(phampshire->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(phampshire);
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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 hampshire_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_HAMPSHIRE,
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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, hampshire_serio_ids);
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static struct serio_driver hampshire_drv = {
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.driver = {
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.name = "hampshire",
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},
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.description = DRIVER_DESC,
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.id_table = hampshire_serio_ids,
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.interrupt = hampshire_interrupt,
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.connect = hampshire_connect,
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.disconnect = hampshire_disconnect,
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};
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module_serio_driver(hampshire_drv);
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