drivers/input/joystick/stinger.c

   1 /*
   2  *  Copyright (c) 2000-2001 Vojtech Pavlik
   3  *  Copyright (c) 2000 Mark Fletcher
   4  */
   5
   6 /*
   7  * Gravis Stinger gamepad driver for Linux
   8  */
   9
  10 /*
  11  * This program is free warftware; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  *
  25  *  Should you need to contact me, the author, you can do so either by
  26  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  27  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  28  */
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/slab.h>
  33 #include <linux/input.h>
  34 #include <linux/serio.h>
  35 #include <linux/init.h>
  36
  37 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
  38
  39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  40 MODULE_DESCRIPTION(DRIVER_DESC);
  41 MODULE_LICENSE("GPL");
  42
  43 /*
  44  * Constants.
  45  */
  46
  47 #define STINGER_MAX_LENGTH 8
  48
  49 /*
  50  * Per-Stinger data.
  51  */
  52
  53 struct stinger {
  54         struct input_dev *dev;
  55         int idx;
  56         unsigned char data[STINGER_MAX_LENGTH];
  57         char phys[32];
  58 };
  59
  60 /*
  61  * stinger_process_packet() decodes packets the driver receives from the
  62  * Stinger. It updates the data accordingly.
  63  */
  64
  65 static void stinger_process_packet(struct stinger *stinger)
  66 {
  67         struct input_dev *dev = stinger->dev;
  68         unsigned char *data = stinger->data;
  69
  70         if (!stinger->idx) return;
  71
  72         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  73         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  74         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  75         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  76         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  77         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  78         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  79         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  80         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  81         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  82
  83         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  84         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  85
  86         input_sync(dev);
  87
  88         return;
  89 }
  90
  91 /*
  92  * stinger_interrupt() is called by the low level driver when characters
  93  * are ready for us. We then buffer them for further processing, or call the
  94  * packet processing routine.
  95  */
  96
  97 static irqreturn_t stinger_interrupt(struct serio *serio,
  98         unsigned char data, unsigned int flags)
  99 {
 100         struct stinger *stinger = serio_get_drvdata(serio);
 101
 102         /* All Stinger packets are 4 bytes */
 103
 104         if (stinger->idx < STINGER_MAX_LENGTH)
 105                 stinger->data[stinger->idx++] = data;
 106
 107         if (stinger->idx == 4) {
 108                 stinger_process_packet(stinger);
 109                 stinger->idx = 0;
 110         }
 111
 112         return IRQ_HANDLED;
 113 }
 114
 115 /*
 116  * stinger_disconnect() is the opposite of stinger_connect()
 117  */
 118
 119 static void stinger_disconnect(struct serio *serio)
 120 {
 121         struct stinger *stinger = serio_get_drvdata(serio);
 122
 123         serio_close(serio);
 124         serio_set_drvdata(serio, NULL);
 125         input_unregister_device(stinger->dev);
 126         kfree(stinger);
 127 }
 128
 129 /*
 130  * stinger_connect() is the routine that is called when someone adds a
 131  * new serio device that supports Stinger protocol and registers it as
 132  * an input device.
 133  */
 134
 135 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 136 {
 137         struct stinger *stinger;
 138         struct input_dev *input_dev;
 139         int err = -ENOMEM;
 140
 141         stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
 142         input_dev = input_allocate_device();
 143         if (!stinger || !input_dev)
 144                 goto fail1;
 145
 146         stinger->dev = input_dev;
 147         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 148
 149         input_dev->name = "Gravis Stinger";
 150         input_dev->phys = stinger->phys;
 151         input_dev->id.bustype = BUS_RS232;
 152         input_dev->id.vendor = SERIO_STINGER;
 153         input_dev->id.product = 0x0001;
 154         input_dev->id.version = 0x0100;
 155         input_dev->dev.parent = &serio->dev;
 156
 157         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 158         input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
 159                 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
 160                 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
 161                 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
 162         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 163         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 164
 165         serio_set_drvdata(serio, stinger);
 166
 167         err = serio_open(serio, drv);
 168         if (err)
 169                 goto fail2;
 170
 171         err = input_register_device(stinger->dev);
 172         if (err)
 173                 goto fail3;
 174
 175         return 0;
 176
 177  fail3: serio_close(serio);
 178  fail2: serio_set_drvdata(serio, NULL);
 179  fail1: input_free_device(input_dev);
 180         kfree(stinger);
 181         return err;
 182 }
 183
 184 /*
 185  * The serio driver structure.
 186  */
 187
 188 static struct serio_device_id stinger_serio_ids[] = {
 189         {
 190                 .type   = SERIO_RS232,
 191                 .proto  = SERIO_STINGER,
 192                 .id     = SERIO_ANY,
 193                 .extra  = SERIO_ANY,
 194         },
 195         { 0 }
 196 };
 197
 198 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
 199
 200 static struct serio_driver stinger_drv = {
 201         .driver         = {
 202                 .name   = "stinger",
 203         },
 204         .description    = DRIVER_DESC,
 205         .id_table       = stinger_serio_ids,
 206         .interrupt      = stinger_interrupt,
 207         .connect        = stinger_connect,
 208         .disconnect     = stinger_disconnect,
 209 };
 210
 211 /*
 212  * The functions for inserting/removing us as a module.
 213  */
 214
 215 static int __init stinger_init(void)
 216 {
 217         return serio_register_driver(&stinger_drv);
 218 }
 219
 220 static void __exit stinger_exit(void)
 221 {
 222         serio_unregister_driver(&stinger_drv);
 223 }
 224
 225 module_init(stinger_init);
 226 module_exit(stinger_exit);