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 static char *stinger_name = "Gravis Stinger";
  52
  53 /*
  54  * Per-Stinger data.
  55  */
  56
  57 struct stinger {
  58         struct input_dev dev;
  59         int idx;
  60         unsigned char data[STINGER_MAX_LENGTH];
  61         char phys[32];
  62 };
  63
  64 /*
  65  * stinger_process_packet() decodes packets the driver receives from the
  66  * Stinger. It updates the data accordingly.
  67  */
  68
  69 static void stinger_process_packet(struct stinger *stinger, struct pt_regs *regs)
  70 {
  71         struct input_dev *dev = &stinger->dev;
  72         unsigned char *data = stinger->data;
  73
  74         if (!stinger->idx) return;
  75
  76         input_regs(dev, regs);
  77
  78         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  79         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  80         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  81         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  82         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  83         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  84         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  85         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  86         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  87         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  88
  89         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  90         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  91
  92         input_sync(dev);
  93
  94         return;
  95 }
  96
  97 /*
  98  * stinger_interrupt() is called by the low level driver when characters
  99  * are ready for us. We then buffer them for further processing, or call the
 100  * packet processing routine.
 101  */
 102
 103 static irqreturn_t stinger_interrupt(struct serio *serio,
 104         unsigned char data, unsigned int flags, struct pt_regs *regs)
 105 {
 106         struct stinger* stinger = serio->private;
 107
 108         /* All Stinger packets are 4 bytes */
 109
 110         if (stinger->idx < STINGER_MAX_LENGTH)
 111                 stinger->data[stinger->idx++] = data;
 112
 113         if (stinger->idx == 4) {
 114                 stinger_process_packet(stinger, regs);
 115                 stinger->idx = 0;
 116         }
 117
 118         return IRQ_HANDLED;
 119 }
 120
 121 /*
 122  * stinger_disconnect() is the opposite of stinger_connect()
 123  */
 124
 125 static void stinger_disconnect(struct serio *serio)
 126 {
 127         struct stinger* stinger = serio->private;
 128         input_unregister_device(&stinger->dev);
 129         serio_close(serio);
 130         kfree(stinger);
 131 }
 132
 133 /*
 134  * stinger_connect() is the routine that is called when someone adds a
 135  * new serio device. It looks for the Stinger, and if found, registers
 136  * it as an input device.
 137  */
 138
 139 static void stinger_connect(struct serio *serio, struct serio_driver *drv)
 140 {
 141         struct stinger *stinger;
 142         int i;
 143
 144         if (serio->type != (SERIO_RS232 | SERIO_STINGER))
 145                 return;
 146
 147         if (!(stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL)))
 148                 return;
 149
 150         memset(stinger, 0, sizeof(struct stinger));
 151
 152         stinger->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 153         stinger->dev.keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) | \
 154                                            BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) | \
 155                                            BIT(BTN_START) | BIT(BTN_SELECT);
 156         stinger->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 157
 158         sprintf(stinger->phys, "%s/serio0", serio->phys);
 159
 160         init_input_dev(&stinger->dev);
 161         stinger->dev.name = stinger_name;
 162         stinger->dev.phys = stinger->phys;
 163         stinger->dev.id.bustype = BUS_RS232;
 164         stinger->dev.id.vendor = SERIO_STINGER;
 165         stinger->dev.id.product = 0x0001;
 166         stinger->dev.id.version = 0x0100;
 167
 168         for (i = 0; i < 2; i++) {
 169                 stinger->dev.absmax[ABS_X+i] =  64;
 170                 stinger->dev.absmin[ABS_X+i] = -64;
 171                 stinger->dev.absflat[ABS_X+i] = 4;
 172         }
 173
 174         stinger->dev.private = stinger;
 175         serio->private = stinger;
 176
 177         if (serio_open(serio, drv)) {
 178                 kfree(stinger);
 179                 return;
 180         }
 181
 182         input_register_device(&stinger->dev);
 183
 184         printk(KERN_INFO "input: %s on %s\n",  stinger_name, serio->phys);
 185
 186 }
 187
 188 /*
 189  * The serio device structure.
 190  */
 191
 192 static struct serio_driver stinger_drv = {
 193         .driver         = {
 194                 .name   = "stinger",
 195         },
 196         .description    = DRIVER_DESC,
 197         .interrupt      = stinger_interrupt,
 198         .connect        = stinger_connect,
 199         .disconnect     = stinger_disconnect,
 200 };
 201
 202 /*
 203  * The functions for inserting/removing us as a module.
 204  */
 205
 206 int __init stinger_init(void)
 207 {
 208         serio_register_driver(&stinger_drv);
 209         return 0;
 210 }
 211
 212 void __exit stinger_exit(void)
 213 {
 214         serio_unregister_driver(&stinger_drv);
 215 }
 216
 217 module_init(stinger_init);
 218 module_exit(stinger_exit);