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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
* Copyright (c) 2000 Mark Fletcher
*/
/*
* Gravis Stinger gamepad driver for Linux
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#define DRIVER_DESC "Gravis Stinger gamepad driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Constants.
*/
#define STINGER_MAX_LENGTH 8
/*
* Per-Stinger data.
*/
struct stinger {
struct input_dev *dev;
int idx;
unsigned char data[STINGER_MAX_LENGTH];
char phys[32];
};
/*
* stinger_process_packet() decodes packets the driver receives from the
* Stinger. It updates the data accordingly.
*/
static void stinger_process_packet(struct stinger *stinger)
{
struct input_dev *dev = stinger->dev;
unsigned char *data = stinger->data;
if (!stinger->idx) return;
input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5));
input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4));
input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3));
input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2));
input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5));
input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4));
input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3));
input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2));
input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
input_report_key(dev, BTN_START, (data[3] & 0x01));
input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
input_sync(dev);
return;
}
/*
* stinger_interrupt() is called by the low level driver when characters
* are ready for us. We then buffer them for further processing, or call the
* packet processing routine.
*/
static irqreturn_t stinger_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct stinger *stinger = serio_get_drvdata(serio);
/* All Stinger packets are 4 bytes */
if (stinger->idx < STINGER_MAX_LENGTH)
stinger->data[stinger->idx++] = data;
if (stinger->idx == 4) {
stinger_process_packet(stinger);
stinger->idx = 0;
}
return IRQ_HANDLED;
}
/*
* stinger_disconnect() is the opposite of stinger_connect()
*/
static void stinger_disconnect(struct serio *serio)
{
struct stinger *stinger = serio_get_drvdata(serio);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_unregister_device(stinger->dev);
kfree(stinger);
}
/*
* stinger_connect() is the routine that is called when someone adds a
* new serio device that supports Stinger protocol and registers it as
* an input device.
*/
static int stinger_connect(struct serio *serio, struct serio_driver *drv)
{
struct stinger *stinger;
struct input_dev *input_dev;
int err = -ENOMEM;
stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
input_dev = input_allocate_device();
if (!stinger || !input_dev)
goto fail1;
stinger->dev = input_dev;
snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
input_dev->name = "Gravis Stinger";
input_dev->phys = stinger->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_STINGER;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &serio->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
serio_set_drvdata(serio, stinger);
err = serio_open(serio, drv);
if (err)
goto fail2;
err = input_register_device(stinger->dev);
if (err)
goto fail3;
return 0;
fail3: serio_close(serio);
fail2: serio_set_drvdata(serio, NULL);
fail1: input_free_device(input_dev);
kfree(stinger);
return err;
}
/*
* The serio driver structure.
*/
static const struct serio_device_id stinger_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_STINGER,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
static struct serio_driver stinger_drv = {
.driver = {
.name = "stinger",
},
.description = DRIVER_DESC,
.id_table = stinger_serio_ids,
.interrupt = stinger_interrupt,
.connect = stinger_connect,
.disconnect = stinger_disconnect,
};
module_serio_driver(stinger_drv);
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