1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 1999-2001 Vojtech Pavlik
7 * Serial mouse driver for Linux
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/interrupt.h>
14 #include <linux/input.h>
15 #include <linux/serio.h>
17 #define DRIVER_DESC "Serial mouse driver"
19 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
20 MODULE_DESCRIPTION(DRIVER_DESC);
21 MODULE_LICENSE("GPL");
23 static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
24 "Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
25 "Logitech MZ++ Mouse"};
28 struct input_dev *dev;
37 * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
38 * applies some prediction to the data, resulting in 96 updates per
39 * second, which is as good as a PS/2 or USB mouse.
42 static void sermouse_process_msc(struct sermouse *sermouse, signed char data)
44 struct input_dev *dev = sermouse->dev;
45 signed char *buf = sermouse->buf;
47 switch (sermouse->count) {
50 if ((data & 0xf8) != 0x80)
52 input_report_key(dev, BTN_LEFT, !(data & 4));
53 input_report_key(dev, BTN_RIGHT, !(data & 1));
54 input_report_key(dev, BTN_MIDDLE, !(data & 2));
59 input_report_rel(dev, REL_X, data / 2);
60 input_report_rel(dev, REL_Y, -buf[1]);
61 buf[0] = data - data / 2;
66 input_report_rel(dev, REL_X, buf[0]);
67 input_report_rel(dev, REL_Y, buf[1] - data);
74 if (++sermouse->count == 5)
79 * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
80 * generates events. With prediction it gets 80 updates/sec, assuming
81 * standard 3-byte packets and 1200 bps.
84 static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
86 struct input_dev *dev = sermouse->dev;
87 signed char *buf = sermouse->buf;
91 else if (sermouse->count == 0)
94 switch (sermouse->count) {
98 input_report_key(dev, BTN_LEFT, (data >> 5) & 1);
99 input_report_key(dev, BTN_RIGHT, (data >> 4) & 1);
104 data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
105 input_report_rel(dev, REL_X, data / 2);
106 input_report_rel(dev, REL_Y, buf[4]);
107 buf[3] = data - data / 2;
111 /* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
112 if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
113 input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
116 data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
117 input_report_rel(dev, REL_X, buf[3]);
118 input_report_rel(dev, REL_Y, data - buf[4]);
124 switch (sermouse->type) {
127 sermouse->type = SERIO_MP;
131 if ((data >> 2) & 3) break; /* M++ Wireless Extension packet. */
132 input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
133 input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
138 input_report_key(dev, BTN_SIDE, (data >> 5) & 1);
142 input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
143 input_report_rel(dev, REL_WHEEL, (data & 8) - (data & 7));
150 case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
151 buf[1] = (data >> 2) & 0x0f;
155 case 7: /* Ignore anything besides MZ++ */
156 if (sermouse->type != SERIO_MZPP)
161 case 1: /* Extra mouse info */
163 input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
164 input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
165 input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
169 default: /* We don't decode anything else yet. */
172 "sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
185 * sermouse_interrupt() handles incoming characters, either gathering them into
186 * packets or passing them to the command routine as command output.
189 static irqreturn_t sermouse_interrupt(struct serio *serio,
190 unsigned char data, unsigned int flags)
192 struct sermouse *sermouse = serio_get_drvdata(serio);
194 if (time_after(jiffies, sermouse->last + HZ/10))
197 sermouse->last = jiffies;
199 if (sermouse->type > SERIO_SUN)
200 sermouse_process_ms(sermouse, data);
202 sermouse_process_msc(sermouse, data);
208 * sermouse_disconnect() cleans up after we don't want talk
209 * to the mouse anymore.
212 static void sermouse_disconnect(struct serio *serio)
214 struct sermouse *sermouse = serio_get_drvdata(serio);
217 serio_set_drvdata(serio, NULL);
218 input_unregister_device(sermouse->dev);
223 * sermouse_connect() is a callback form the serio module when
224 * an unhandled serio port is found.
227 static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
229 struct sermouse *sermouse;
230 struct input_dev *input_dev;
231 unsigned char c = serio->id.extra;
234 sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);
235 input_dev = input_allocate_device();
236 if (!sermouse || !input_dev)
239 sermouse->dev = input_dev;
240 snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
241 sermouse->type = serio->id.proto;
243 input_dev->name = sermouse_protocols[sermouse->type];
244 input_dev->phys = sermouse->phys;
245 input_dev->id.bustype = BUS_RS232;
246 input_dev->id.vendor = sermouse->type;
247 input_dev->id.product = c;
248 input_dev->id.version = 0x0100;
249 input_dev->dev.parent = &serio->dev;
251 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
252 input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
254 input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
256 if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
257 if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
258 if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
259 if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
260 if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
262 serio_set_drvdata(serio, sermouse);
264 err = serio_open(serio, drv);
268 err = input_register_device(sermouse->dev);
274 fail3: serio_close(serio);
275 fail2: serio_set_drvdata(serio, NULL);
276 fail1: input_free_device(input_dev);
281 static struct serio_device_id sermouse_serio_ids[] = {
327 MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
329 static struct serio_driver sermouse_drv = {
333 .description = DRIVER_DESC,
334 .id_table = sermouse_serio_ids,
335 .interrupt = sermouse_interrupt,
336 .connect = sermouse_connect,
337 .disconnect = sermouse_disconnect,
340 module_serio_driver(sermouse_drv);