input/joystick/stinger.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Copyright (c) 2000-2001 Vojtech Pavlik
0004  *  Copyright (c) 2000 Mark Fletcher
0005  */
0006
0007 /*
0008  * Gravis Stinger gamepad driver for Linux
0009  */
0010
0011 /*
0012  */
0013
0014 #include <linux/kernel.h>
0015 #include <linux/module.h>
0016 #include <linux/slab.h>
0017 #include <linux/input.h>
0018 #include <linux/serio.h>
0019
0020 #define DRIVER_DESC "Gravis Stinger gamepad driver"
0021
0022 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
0023 MODULE_DESCRIPTION(DRIVER_DESC);
0024 MODULE_LICENSE("GPL");
0025
0026 /*
0027  * Constants.
0028  */
0029
0030 #define STINGER_MAX_LENGTH 8
0031
0032 /*
0033  * Per-Stinger data.
0034  */
0035
0036 struct stinger {
0037     struct input_dev *dev;
0038     int idx;
0039     unsigned char data[STINGER_MAX_LENGTH];
0040     char phys[32];
0041 };
0042
0043 /*
0044  * stinger_process_packet() decodes packets the driver receives from the
0045  * Stinger. It updates the data accordingly.
0046  */
0047
0048 static void stinger_process_packet(struct stinger *stinger)
0049 {
0050     struct input_dev *dev = stinger->dev;
0051     unsigned char *data = stinger->data;
0052
0053     if (!stinger->idx) return;
0054
0055     input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
0056     input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
0057     input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
0058     input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
0059     input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
0060     input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
0061     input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
0062     input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
0063     input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
0064     input_report_key(dev, BTN_START,   (data[3] & 0x01));
0065
0066     input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
0067     input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
0068
0069     input_sync(dev);
0070
0071     return;
0072 }
0073
0074 /*
0075  * stinger_interrupt() is called by the low level driver when characters
0076  * are ready for us. We then buffer them for further processing, or call the
0077  * packet processing routine.
0078  */
0079
0080 static irqreturn_t stinger_interrupt(struct serio *serio,
0081     unsigned char data, unsigned int flags)
0082 {
0083     struct stinger *stinger = serio_get_drvdata(serio);
0084
0085     /* All Stinger packets are 4 bytes */
0086
0087     if (stinger->idx < STINGER_MAX_LENGTH)
0088         stinger->data[stinger->idx++] = data;
0089
0090     if (stinger->idx == 4) {
0091         stinger_process_packet(stinger);
0092         stinger->idx = 0;
0093     }
0094
0095     return IRQ_HANDLED;
0096 }
0097
0098 /*
0099  * stinger_disconnect() is the opposite of stinger_connect()
0100  */
0101
0102 static void stinger_disconnect(struct serio *serio)
0103 {
0104     struct stinger *stinger = serio_get_drvdata(serio);
0105
0106     serio_close(serio);
0107     serio_set_drvdata(serio, NULL);
0108     input_unregister_device(stinger->dev);
0109     kfree(stinger);
0110 }
0111
0112 /*
0113  * stinger_connect() is the routine that is called when someone adds a
0114  * new serio device that supports Stinger protocol and registers it as
0115  * an input device.
0116  */
0117
0118 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
0119 {
0120     struct stinger *stinger;
0121     struct input_dev *input_dev;
0122     int err = -ENOMEM;
0123
0124     stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
0125     input_dev = input_allocate_device();
0126     if (!stinger || !input_dev)
0127         goto fail1;
0128
0129     stinger->dev = input_dev;
0130     snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
0131
0132     input_dev->name = "Gravis Stinger";
0133     input_dev->phys = stinger->phys;
0134     input_dev->id.bustype = BUS_RS232;
0135     input_dev->id.vendor = SERIO_STINGER;
0136     input_dev->id.product = 0x0001;
0137     input_dev->id.version = 0x0100;
0138     input_dev->dev.parent = &serio->dev;
0139
0140     input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
0141     input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
0142         BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
0143         BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
0144         BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
0145     input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
0146     input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
0147
0148     serio_set_drvdata(serio, stinger);
0149
0150     err = serio_open(serio, drv);
0151     if (err)
0152         goto fail2;
0153
0154     err = input_register_device(stinger->dev);
0155     if (err)
0156         goto fail3;
0157
0158     return 0;
0159
0160  fail3: serio_close(serio);
0161  fail2: serio_set_drvdata(serio, NULL);
0162  fail1: input_free_device(input_dev);
0163     kfree(stinger);
0164     return err;
0165 }
0166
0167 /*
0168  * The serio driver structure.
0169  */
0170
0171 static const struct serio_device_id stinger_serio_ids[] = {
0172     {
0173         .type   = SERIO_RS232,
0174         .proto  = SERIO_STINGER,
0175         .id = SERIO_ANY,
0176         .extra  = SERIO_ANY,
0177     },
0178     { 0 }
0179 };
0180
0181 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
0182
0183 static struct serio_driver stinger_drv = {
0184     .driver     = {
0185         .name   = "stinger",
0186     },
0187     .description    = DRIVER_DESC,
0188     .id_table   = stinger_serio_ids,
0189     .interrupt  = stinger_interrupt,
0190     .connect    = stinger_connect,
0191     .disconnect = stinger_disconnect,
0192 };
0193
0194 module_serio_driver(stinger_drv);