178 lines
4 KiB
C
178 lines
4 KiB
C
/*
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* Fujitsu serial touchscreen driver
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*
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* Copyright (c) Dmitry Torokhov <dtor@mail.ru>
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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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#define DRIVER_DESC "Fujitsu serial touchscreen driver"
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MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define FUJITSU_LENGTH 5
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/*
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* Per-touchscreen data.
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*/
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struct fujitsu {
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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[FUJITSU_LENGTH];
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char phys[32];
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};
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/*
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* Decode serial data (5 bytes per packet)
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* First byte
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* 1 C 0 0 R S S S
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* Where C is 1 while in calibration mode (which we don't use)
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* R is 1 when no coordinate corection was done.
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* S are button state
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*/
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static irqreturn_t fujitsu_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct fujitsu *fujitsu = serio_get_drvdata(serio);
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struct input_dev *dev = fujitsu->dev;
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if (fujitsu->idx == 0) {
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/* resync skip until start of frame */
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if ((data & 0xf0) != 0x80)
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return IRQ_HANDLED;
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} else {
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/* resync skip garbage */
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if (data & 0x80) {
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fujitsu->idx = 0;
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return IRQ_HANDLED;
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}
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}
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fujitsu->data[fujitsu->idx++] = data;
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if (fujitsu->idx == FUJITSU_LENGTH) {
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input_report_abs(dev, ABS_X,
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(fujitsu->data[2] << 7) | fujitsu->data[1]);
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input_report_abs(dev, ABS_Y,
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(fujitsu->data[4] << 7) | fujitsu->data[3]);
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input_report_key(dev, BTN_TOUCH,
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(fujitsu->data[0] & 0x03) != 2);
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input_sync(dev);
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fujitsu->idx = 0;
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}
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return IRQ_HANDLED;
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}
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/*
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* fujitsu_disconnect() is the opposite of fujitsu_connect()
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*/
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static void fujitsu_disconnect(struct serio *serio)
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{
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struct fujitsu *fujitsu = serio_get_drvdata(serio);
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input_get_device(fujitsu->dev);
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input_unregister_device(fujitsu->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(fujitsu->dev);
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kfree(fujitsu);
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}
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/*
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* fujitsu_connect() is the routine that is called when someone adds a
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* new serio device that supports the Fujitsu protocol and registers it
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* as input device.
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*/
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static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct fujitsu *fujitsu;
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struct input_dev *input_dev;
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int err;
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fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!fujitsu || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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fujitsu->serio = serio;
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fujitsu->dev = input_dev;
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snprintf(fujitsu->phys, sizeof(fujitsu->phys),
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"%s/input0", serio->phys);
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input_dev->name = "Fujitsu Serial Touchscreen";
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input_dev->phys = fujitsu->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_FUJITSU;
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input_dev->id.product = 0;
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input_dev->id.version = 0x0100;
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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(input_dev, ABS_X, 0, 4096, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
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serio_set_drvdata(serio, fujitsu);
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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(fujitsu->dev);
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if (err)
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goto fail3;
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return 0;
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fail3:
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serio_close(serio);
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fail2:
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serio_set_drvdata(serio, NULL);
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fail1:
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input_free_device(input_dev);
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kfree(fujitsu);
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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 fujitsu_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_FUJITSU,
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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, fujitsu_serio_ids);
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static struct serio_driver fujitsu_drv = {
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.driver = {
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.name = "fujitsu_ts",
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},
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.description = DRIVER_DESC,
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.id_table = fujitsu_serio_ids,
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.interrupt = fujitsu_interrupt,
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.connect = fujitsu_connect,
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.disconnect = fujitsu_disconnect,
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};
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module_serio_driver(fujitsu_drv);
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