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
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/input.h>
  30 #include <linux/serio.h>
  31
  32 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
  33
  34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  35 MODULE_DESCRIPTION(DRIVER_DESC);
  36 MODULE_LICENSE("GPL");
  37
  38 /*
  39  * Constants.
  40  */
  41
  42 #define STINGER_MAX_LENGTH 8
  43
  44 /*
  45  * Per-Stinger data.
  46  */
  47
  48 struct stinger {
  49         struct input_dev *dev;
  50         int idx;
  51         unsigned char data[STINGER_MAX_LENGTH];
  52         char phys[32];
  53 };
  54
  55 /*
  56  * stinger_process_packet() decodes packets the driver receives from the
  57  * Stinger. It updates the data accordingly.
  58  */
  59
  60 static void stinger_process_packet(struct stinger *stinger)
  61 {
  62         struct input_dev *dev = stinger->dev;
  63         unsigned char *data = stinger->data;
  64
  65         if (!stinger->idx) return;
  66
  67         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  68         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  69         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  70         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  71         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  72         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  73         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  74         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  75         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  76         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  77
  78         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  79         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  80
  81         input_sync(dev);
  82
  83         return;
  84 }
  85
  86 /*
  87  * stinger_interrupt() is called by the low level driver when characters
  88  * are ready for us. We then buffer them for further processing, or call the
  89  * packet processing routine.
  90  */
  91
  92 static irqreturn_t stinger_interrupt(struct serio *serio,
  93         unsigned char data, unsigned int flags)
  94 {
  95         struct stinger *stinger = serio_get_drvdata(serio);
  96
  97         /* All Stinger packets are 4 bytes */
  98
  99         if (stinger->idx < STINGER_MAX_LENGTH)
 100                 stinger->data[stinger->idx++] = data;
 101
 102         if (stinger->idx == 4) {
 103                 stinger_process_packet(stinger);
 104                 stinger->idx = 0;
 105         }
 106
 107         return IRQ_HANDLED;
 108 }
 109
 110 /*
 111  * stinger_disconnect() is the opposite of stinger_connect()
 112  */
 113
 114 static void stinger_disconnect(struct serio *serio)
 115 {
 116         struct stinger *stinger = serio_get_drvdata(serio);
 117
 118         serio_close(serio);
 119         serio_set_drvdata(serio, NULL);
 120         input_unregister_device(stinger->dev);
 121         kfree(stinger);
 122 }
 123
 124 /*
 125  * stinger_connect() is the routine that is called when someone adds a
 126  * new serio device that supports Stinger protocol and registers it as
 127  * an input device.
 128  */
 129
 130 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 131 {
 132         struct stinger *stinger;
 133         struct input_dev *input_dev;
 134         int err = -ENOMEM;
 135
 136         stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
 137         input_dev = input_allocate_device();
 138         if (!stinger || !input_dev)
 139                 goto fail1;
 140
 141         stinger->dev = input_dev;
 142         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 143
 144         input_dev->name = "Gravis Stinger";
 145         input_dev->phys = stinger->phys;
 146         input_dev->id.bustype = BUS_RS232;
 147         input_dev->id.vendor = SERIO_STINGER;
 148         input_dev->id.product = 0x0001;
 149         input_dev->id.version = 0x0100;
 150         input_dev->dev.parent = &serio->dev;
 151
 152         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 153         input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
 154                 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
 155                 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
 156                 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
 157         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 158         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 159
 160         serio_set_drvdata(serio, stinger);
 161
 162         err = serio_open(serio, drv);
 163         if (err)
 164                 goto fail2;
 165
 166         err = input_register_device(stinger->dev);
 167         if (err)
 168                 goto fail3;
 169
 170         return 0;
 171
 172  fail3: serio_close(serio);
 173  fail2: serio_set_drvdata(serio, NULL);
 174  fail1: input_free_device(input_dev);
 175         kfree(stinger);
 176         return err;
 177 }
 178
 179 /*
 180  * The serio driver structure.
 181  */
 182
 183 static const struct serio_device_id stinger_serio_ids[] = {
 184         {
 185                 .type   = SERIO_RS232,
 186                 .proto  = SERIO_STINGER,
 187                 .id     = SERIO_ANY,
 188                 .extra  = SERIO_ANY,
 189         },
 190         { 0 }
 191 };
 192
 193 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
 194
 195 static struct serio_driver stinger_drv = {
 196         .driver         = {
 197                 .name   = "stinger",
 198         },
 199         .description    = DRIVER_DESC,
 200         .id_table       = stinger_serio_ids,
 201         .interrupt      = stinger_interrupt,
 202         .connect        = stinger_connect,
 203         .disconnect     = stinger_disconnect,
 204 };
 205
 206 module_serio_driver(stinger_drv);