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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* Serial mouse driver for Linux
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#define DRIVER_DESC "Serial mouse driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
"Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
"Logitech MZ++ Mouse"};
struct sermouse {
struct input_dev *dev;
signed char buf[8];
unsigned char count;
unsigned char type;
unsigned long last;
char phys[32];
};
/*
* sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
* applies some prediction to the data, resulting in 96 updates per
* second, which is as good as a PS/2 or USB mouse.
*/
static void sermouse_process_msc(struct sermouse *sermouse, signed char data)
{
struct input_dev *dev = sermouse->dev;
signed char *buf = sermouse->buf;
switch (sermouse->count) {
case 0:
if ((data & 0xf8) != 0x80)
return;
input_report_key(dev, BTN_LEFT, !(data & 4));
input_report_key(dev, BTN_RIGHT, !(data & 1));
input_report_key(dev, BTN_MIDDLE, !(data & 2));
break;
case 1:
case 3:
input_report_rel(dev, REL_X, data / 2);
input_report_rel(dev, REL_Y, -buf[1]);
buf[0] = data - data / 2;
break;
case 2:
case 4:
input_report_rel(dev, REL_X, buf[0]);
input_report_rel(dev, REL_Y, buf[1] - data);
buf[1] = data / 2;
break;
}
input_sync(dev);
if (++sermouse->count == 5)
sermouse->count = 0;
}
/*
* sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
* generates events. With prediction it gets 80 updates/sec, assuming
* standard 3-byte packets and 1200 bps.
*/
static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
{
struct input_dev *dev = sermouse->dev;
signed char *buf = sermouse->buf;
if (data & 0x40)
sermouse->count = 0;
else if (sermouse->count == 0)
return;
switch (sermouse->count) {
case 0:
buf[1] = data;
input_report_key(dev, BTN_LEFT, (data >> 5) & 1);
input_report_key(dev, BTN_RIGHT, (data >> 4) & 1);
break;
case 1:
buf[2] = data;
data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
input_report_rel(dev, REL_X, data / 2);
input_report_rel(dev, REL_Y, buf[4]);
buf[3] = data - data / 2;
break;
case 2:
/* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
buf[0] = buf[1];
data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
input_report_rel(dev, REL_X, buf[3]);
input_report_rel(dev, REL_Y, data - buf[4]);
buf[4] = data / 2;
break;
case 3:
switch (sermouse->type) {
case SERIO_MS:
sermouse->type = SERIO_MP;
fallthrough;
case SERIO_MP:
if ((data >> 2) & 3) break; /* M++ Wireless Extension packet. */
input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
break;
case SERIO_MZP:
case SERIO_MZPP:
input_report_key(dev, BTN_SIDE, (data >> 5) & 1);
fallthrough;
case SERIO_MZ:
input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
input_report_rel(dev, REL_WHEEL, (data & 8) - (data & 7));
break;
}
break;
case 4:
case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
buf[1] = (data >> 2) & 0x0f;
break;
case 5:
case 7: /* Ignore anything besides MZ++ */
if (sermouse->type != SERIO_MZPP)
break;
switch (buf[1]) {
case 1: /* Extra mouse info */
input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
break;
default: /* We don't decode anything else yet. */
printk(KERN_WARNING
"sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
break;
}
break;
}
input_sync(dev);
sermouse->count++;
}
/*
* sermouse_interrupt() handles incoming characters, either gathering them into
* packets or passing them to the command routine as command output.
*/
static irqreturn_t sermouse_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct sermouse *sermouse = serio_get_drvdata(serio);
if (time_after(jiffies, sermouse->last + HZ/10))
sermouse->count = 0;
sermouse->last = jiffies;
if (sermouse->type > SERIO_SUN)
sermouse_process_ms(sermouse, data);
else
sermouse_process_msc(sermouse, data);
return IRQ_HANDLED;
}
/*
* sermouse_disconnect() cleans up after we don't want talk
* to the mouse anymore.
*/
static void sermouse_disconnect(struct serio *serio)
{
struct sermouse *sermouse = serio_get_drvdata(serio);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_unregister_device(sermouse->dev);
kfree(sermouse);
}
/*
* sermouse_connect() is a callback form the serio module when
* an unhandled serio port is found.
*/
static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
{
struct sermouse *sermouse;
struct input_dev *input_dev;
unsigned char c = serio->id.extra;
int err = -ENOMEM;
sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);
input_dev = input_allocate_device();
if (!sermouse || !input_dev)
goto fail1;
sermouse->dev = input_dev;
snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
sermouse->type = serio->id.proto;
input_dev->name = sermouse_protocols[sermouse->type];
input_dev->phys = sermouse->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = sermouse->type;
input_dev->id.product = c;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &serio->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
BIT_MASK(BTN_RIGHT);
input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
serio_set_drvdata(serio, sermouse);
err = serio_open(serio, drv);
if (err)
goto fail2;
err = input_register_device(sermouse->dev);
if (err)
goto fail3;
return 0;
fail3: serio_close(serio);
fail2: serio_set_drvdata(serio, NULL);
fail1: input_free_device(input_dev);
kfree(sermouse);
return err;
}
static struct serio_device_id sermouse_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_MSC,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_SUN,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_MS,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_MP,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_MZ,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_MZP,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{
.type = SERIO_RS232,
.proto = SERIO_MZPP,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
static struct serio_driver sermouse_drv = {
.driver = {
.name = "sermouse",
},
.description = DRIVER_DESC,
.id_table = sermouse_serio_ids,
.interrupt = sermouse_interrupt,
.connect = sermouse_connect,
.disconnect = sermouse_disconnect,
};
module_serio_driver(sermouse_drv);
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