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![Arvind Yadav](/assets/img/avatar_default.png)
serio_device_id are not supposed to change at runtime. All functions working with serio_device_id provided by <linux/serio.h> work with const serio_device_id. So mark the non-const structs as const. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
204 lines
5 KiB
C
204 lines
5 KiB
C
/*
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* MicroTouch (3M) serial touchscreen driver
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*
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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 by
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* the Free Software Foundation.
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*/
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/*
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* 2005/02/19 Dan Streetman <ddstreet@ieee.org>
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* Copied elo.c and edited for MicroTouch 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 "MicroTouch serial touchscreen driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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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 MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
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#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
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#define MTOUCH_FORMAT_TABLET_LENGTH 5
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#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
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#define MTOUCH_RESPONSE_END_BYTE 0x0d
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/* todo: check specs for max length of all responses */
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#define MTOUCH_MAX_LENGTH 16
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#define MTOUCH_MIN_XC 0
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#define MTOUCH_MAX_XC 0x3fff
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#define MTOUCH_MIN_YC 0
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#define MTOUCH_MAX_YC 0x3fff
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#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
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#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
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#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
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/*
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* Per-touchscreen data.
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*/
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struct mtouch {
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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[MTOUCH_MAX_LENGTH];
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char phys[32];
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};
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static void mtouch_process_format_tablet(struct mtouch *mtouch)
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{
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struct input_dev *dev = mtouch->dev;
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if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
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input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
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input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
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input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
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input_sync(dev);
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mtouch->idx = 0;
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}
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}
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static void mtouch_process_response(struct mtouch *mtouch)
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{
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if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
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/* FIXME - process response */
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mtouch->idx = 0;
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} else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
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printk(KERN_ERR "mtouch.c: too many response bytes\n");
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mtouch->idx = 0;
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}
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}
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static irqreturn_t mtouch_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct mtouch* mtouch = serio_get_drvdata(serio);
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mtouch->data[mtouch->idx] = data;
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if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
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mtouch_process_format_tablet(mtouch);
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else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
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mtouch_process_response(mtouch);
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else
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printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
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return IRQ_HANDLED;
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}
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/*
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* mtouch_disconnect() is the opposite of mtouch_connect()
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*/
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static void mtouch_disconnect(struct serio *serio)
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{
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struct mtouch* mtouch = serio_get_drvdata(serio);
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input_get_device(mtouch->dev);
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input_unregister_device(mtouch->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(mtouch->dev);
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kfree(mtouch);
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}
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/*
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* mtouch_connect() is the routine that is called when someone adds a
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* new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
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* an input device.
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*/
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static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct mtouch *mtouch;
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struct input_dev *input_dev;
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int err;
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mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!mtouch || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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mtouch->serio = serio;
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mtouch->dev = input_dev;
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snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
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input_dev->name = "MicroTouch Serial TouchScreen";
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input_dev->phys = mtouch->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_MICROTOUCH;
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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(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
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input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
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serio_set_drvdata(serio, mtouch);
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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(mtouch->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(mtouch);
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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 mtouch_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_MICROTOUCH,
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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, mtouch_serio_ids);
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static struct serio_driver mtouch_drv = {
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.driver = {
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.name = "mtouch",
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},
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.description = DRIVER_DESC,
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.id_table = mtouch_serio_ids,
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.interrupt = mtouch_interrupt,
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.connect = mtouch_connect,
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.disconnect = mtouch_disconnect,
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};
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module_serio_driver(mtouch_drv);
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