mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 21:06:39 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
220 lines
5.2 KiB
C
220 lines
5.2 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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#include <linux/init.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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static char *mtouch_name = "MicroTouch Serial TouchScreen";
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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, struct pt_regs *regs)
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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_regs(dev, regs);
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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, struct pt_regs *regs)
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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, struct pt_regs *regs)
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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, regs);
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else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
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mtouch_process_response(mtouch, regs);
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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_unregister_device(&mtouch->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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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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int err;
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if (!(mtouch = kmalloc(sizeof(*mtouch), GFP_KERNEL)))
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return -ENOMEM;
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memset(mtouch, 0, sizeof(*mtouch));
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init_input_dev(&mtouch->dev);
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mtouch->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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mtouch->dev.keybit[LONG(BTN_TOUCH)] = BIT(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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mtouch->serio = serio;
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sprintf(mtouch->phys, "%s/input0", serio->phys);
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mtouch->dev.private = mtouch;
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mtouch->dev.name = mtouch_name;
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mtouch->dev.phys = mtouch->phys;
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mtouch->dev.id.bustype = BUS_RS232;
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mtouch->dev.id.vendor = SERIO_MICROTOUCH;
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mtouch->dev.id.product = 0;
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mtouch->dev.id.version = 0x0100;
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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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serio_set_drvdata(serio, NULL);
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kfree(mtouch);
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return err;
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}
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input_register_device(&mtouch->dev);
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printk(KERN_INFO "input: %s on %s\n", mtouch->dev.name, serio->phys);
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return 0;
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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 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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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init mtouch_init(void)
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{
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serio_register_driver(&mtouch_drv);
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return 0;
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}
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static void __exit mtouch_exit(void)
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{
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serio_unregister_driver(&mtouch_drv);
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}
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module_init(mtouch_init);
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module_exit(mtouch_exit);
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