drivers/input/joystick/stinger.c

   1 /*
   2  * $Id: stinger.c,v 1.10 2002/01/22 20:29:31 vojtech Exp $
   3  *
   4  *  Copyright (c) 2000-2001 Vojtech Pavlik
   5  *  Copyright (c) 2000 Mark Fletcher
   6  */
   7
   8 /*
   9  * Gravis Stinger gamepad driver for Linux
  10  */
  11
  12 /*
  13  * This program is free warftware; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  *  Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/input.h>
  36 #include <linux/serio.h>
  37 #include <linux/init.h>
  38
  39 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
  40
  41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  42 MODULE_DESCRIPTION(DRIVER_DESC);
  43 MODULE_LICENSE("GPL");
  44
  45 /*
  46  * Constants.
  47  */
  48
  49 #define STINGER_MAX_LENGTH 8
  50
  51 /*
  52  * Per-Stinger data.
  53  */
  54
  55 struct stinger {
  56         struct input_dev *dev;
  57         int idx;
  58         unsigned char data[STINGER_MAX_LENGTH];
  59         char phys[32];
  60 };
  61
  62 /*
  63  * stinger_process_packet() decodes packets the driver receives from the
  64  * Stinger. It updates the data accordingly.
  65  */
  66
  67 static void stinger_process_packet(struct stinger *stinger, struct pt_regs *regs)
  68 {
  69         struct input_dev *dev = stinger->dev;
  70         unsigned char *data = stinger->data;
  71
  72         if (!stinger->idx) return;
  73
  74         input_regs(dev, regs);
  75
  76         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  77         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  78         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  79         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  80         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  81         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  82         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  83         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  84         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  85         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  86
  87         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  88         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  89
  90         input_sync(dev);
  91
  92         return;
  93 }
  94
  95 /*
  96  * stinger_interrupt() is called by the low level driver when characters
  97  * are ready for us. We then buffer them for further processing, or call the
  98  * packet processing routine.
  99  */
 100
 101 static irqreturn_t stinger_interrupt(struct serio *serio,
 102         unsigned char data, unsigned int flags, struct pt_regs *regs)
 103 {
 104         struct stinger *stinger = serio_get_drvdata(serio);
 105
 106         /* All Stinger packets are 4 bytes */
 107
 108         if (stinger->idx < STINGER_MAX_LENGTH)
 109                 stinger->data[stinger->idx++] = data;
 110
 111         if (stinger->idx == 4) {
 112                 stinger_process_packet(stinger, regs);
 113                 stinger->idx = 0;
 114         }
 115
 116         return IRQ_HANDLED;
 117 }
 118
 119 /*
 120  * stinger_disconnect() is the opposite of stinger_connect()
 121  */
 122
 123 static void stinger_disconnect(struct serio *serio)
 124 {
 125         struct stinger *stinger = serio_get_drvdata(serio);
 126
 127         serio_close(serio);
 128         serio_set_drvdata(serio, NULL);
 129         input_unregister_device(stinger->dev);
 130         kfree(stinger);
 131 }
 132
 133 /*
 134  * stinger_connect() is the routine that is called when someone adds a
 135  * new serio device that supports Stinger protocol and registers it as
 136  * an input device.
 137  */
 138
 139 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 140 {
 141         struct stinger *stinger;
 142         struct input_dev *input_dev;
 143         int err = -ENOMEM;
 144
 145         stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
 146         input_dev = input_allocate_device();
 147         if (!stinger || !input_dev)
 148                 goto fail;
 149
 150         stinger->dev = input_dev;
 151         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 152
 153         input_dev->name = "Gravis Stinger";
 154         input_dev->phys = stinger->phys;
 155         input_dev->id.bustype = BUS_RS232;
 156         input_dev->id.vendor = SERIO_STINGER;
 157         input_dev->id.product = 0x0001;
 158         input_dev->id.version = 0x0100;
 159         input_dev->cdev.dev = &serio->dev;
 160         input_dev->private = stinger;
 161
 162         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 163         input_dev->keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) |
 164                                          BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) |
 165                                          BIT(BTN_START) | BIT(BTN_SELECT);
 166         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 167         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 168
 169         serio_set_drvdata(serio, stinger);
 170
 171         err = serio_open(serio, drv);
 172         if (err)
 173                 goto fail;
 174
 175         input_register_device(stinger->dev);
 176         return 0;
 177
 178  fail:  serio_set_drvdata(serio, NULL);
 179         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         serio_register_driver(&stinger_drv);
 218         return 0;
 219 }
 220
 221 static void __exit stinger_exit(void)
 222 {
 223         serio_unregister_driver(&stinger_drv);
 224 }
 225
 226 module_init(stinger_init);
 227 module_exit(stinger_exit);