v4.19.13 snapshot.
diff --git a/drivers/input/mouse/sermouse.c b/drivers/input/mouse/sermouse.c
new file mode 100644
index 0000000..3e8fb81
--- /dev/null
+++ b/drivers/input/mouse/sermouse.c
@@ -0,0 +1,355 @@
+/*
+ * Copyright (c) 1999-2001 Vojtech Pavlik
+ */
+
+/*
+ * Serial mouse driver for Linux
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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;
+ /* fall through */
+
+ 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);
+ /* fall through */
+
+ 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);