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