From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- drivers/input/mouse/sermouse.c | 340 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 340 insertions(+) create mode 100644 drivers/input/mouse/sermouse.c (limited to 'drivers/input/mouse/sermouse.c') diff --git a/drivers/input/mouse/sermouse.c b/drivers/input/mouse/sermouse.c new file mode 100644 index 000000000..c334a4887 --- /dev/null +++ b/drivers/input/mouse/sermouse.c @@ -0,0 +1,340 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1999-2001 Vojtech Pavlik + */ + +/* + * Serial mouse driver for Linux + */ + +#include +#include +#include +#include +#include +#include + +#define DRIVER_DESC "Serial mouse driver" + +MODULE_AUTHOR("Vojtech Pavlik "); +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_obj(*sermouse); + 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); -- cgit v1.3.1