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
  36 #define DRIVER_DESC     "Gravis Stinger gamepad driver"
  37
  38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39 MODULE_DESCRIPTION(DRIVER_DESC);
  40 MODULE_LICENSE("GPL");
  41
  42 /*
  43  * Constants.
  44  */
  45
  46 #define STINGER_MAX_LENGTH 8
  47
  48 /*
  49  * Per-Stinger data.
  50  */
  51
  52 struct stinger {
  53         struct input_dev *dev;
  54         int idx;
  55         unsigned char data[STINGER_MAX_LENGTH];
  56         char phys[32];
  57 };
  58
  59 /*
  60  * stinger_process_packet() decodes packets the driver receives from the
  61  * Stinger. It updates the data accordingly.
  62  */
  63
  64 static void stinger_process_packet(struct stinger *stinger)
  65 {
  66         struct input_dev *dev = stinger->dev;
  67         unsigned char *data = stinger->data;
  68
  69         if (!stinger->idx) return;
  70
  71         input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));
  72         input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));
  73         input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));
  74         input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));
  75         input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));
  76         input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));
  77         input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
  78         input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
  79         input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
  80         input_report_key(dev, BTN_START,   (data[3] & 0x01));
  81
  82         input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
  83         input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
  84
  85         input_sync(dev);
  86
  87         return;
  88 }
  89
  90 /*
  91  * stinger_interrupt() is called by the low level driver when characters
  92  * are ready for us. We then buffer them for further processing, or call the
  93  * packet processing routine.
  94  */
  95
  96 static irqreturn_t stinger_interrupt(struct serio *serio,
  97         unsigned char data, unsigned int flags)
  98 {
  99         struct stinger *stinger = serio_get_drvdata(serio);
 100
 101         /* All Stinger packets are 4 bytes */
 102
 103         if (stinger->idx < STINGER_MAX_LENGTH)
 104                 stinger->data[stinger->idx++] = data;
 105
 106         if (stinger->idx == 4) {
 107                 stinger_process_packet(stinger);
 108                 stinger->idx = 0;
 109         }
 110
 111         return IRQ_HANDLED;
 112 }
 113
 114 /*
 115  * stinger_disconnect() is the opposite of stinger_connect()
 116  */
 117
 118 static void stinger_disconnect(struct serio *serio)
 119 {
 120         struct stinger *stinger = serio_get_drvdata(serio);
 121
 122         serio_close(serio);
 123         serio_set_drvdata(serio, NULL);
 124         input_unregister_device(stinger->dev);
 125         kfree(stinger);
 126 }
 127
 128 /*
 129  * stinger_connect() is the routine that is called when someone adds a
 130  * new serio device that supports Stinger protocol and registers it as
 131  * an input device.
 132  */
 133
 134 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
 135 {
 136         struct stinger *stinger;
 137         struct input_dev *input_dev;
 138         int err = -ENOMEM;
 139
 140         stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
 141         input_dev = input_allocate_device();
 142         if (!stinger || !input_dev)
 143                 goto fail1;
 144
 145         stinger->dev = input_dev;
 146         snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
 147
 148         input_dev->name = "Gravis Stinger";
 149         input_dev->phys = stinger->phys;
 150         input_dev->id.bustype = BUS_RS232;
 151         input_dev->id.vendor = SERIO_STINGER;
 152         input_dev->id.product = 0x0001;
 153         input_dev->id.version = 0x0100;
 154         input_dev->dev.parent = &serio->dev;
 155
 156         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 157         input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
 158                 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
 159                 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
 160                 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
 161         input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
 162         input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
 163
 164         serio_set_drvdata(serio, stinger);
 165
 166         err = serio_open(serio, drv);
 167         if (err)
 168                 goto fail2;
 169
 170         err = input_register_device(stinger->dev);
 171         if (err)
 172                 goto fail3;
 173
 174         return 0;
 175
 176  fail3: serio_close(serio);
 177  fail2: serio_set_drvdata(serio, NULL);
 178  fail1: input_free_device(input_dev);
 179         kfree(stinger);
 180         return err;
 181 }
 182
 183 /*
 184  * The serio driver structure.
 185  */
 186
 187 static const struct serio_device_id stinger_serio_ids[] = {
 188         {
 189                 .type   = SERIO_RS232,
 190                 .proto  = SERIO_STINGER,
 191                 .id     = SERIO_ANY,
 192                 .extra  = SERIO_ANY,
 193         },
 194         { 0 }
 195 };
 196
 197 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
 198
 199 static struct serio_driver stinger_drv = {
 200         .driver         = {
 201                 .name   = "stinger",
 202         },
 203         .description    = DRIVER_DESC,
 204         .id_table       = stinger_serio_ids,
 205         .interrupt      = stinger_interrupt,
 206         .connect        = stinger_connect,
 207         .disconnect     = stinger_disconnect,
 208 };
 209
 210 module_serio_driver(stinger_drv);