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gf2k.c

/*
 * $Id: gf2k.c,v 1.19 2002/01/22 20:27:43 vojtech Exp $
 *
 *  Copyright (c) 1998-2001 Vojtech Pavlik
 */

/*
 * Genius Flight 2000 joystick driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <linux/jiffies.h>

#define DRIVER_DESC     "Genius Flight 2000 joystick driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define GF2K_START            400   /* The time we wait for the first bit [400 us] */
#define GF2K_STROBE           40    /* The time we wait for the first bit [40 us] */
#define GF2K_TIMEOUT          4     /* Wait for everything to settle [4 ms] */
#define GF2K_LENGTH           80    /* Max number of triplets in a packet */

/*
 * Genius joystick ids ...
 */

#define GF2K_ID_G09           1
#define GF2K_ID_F30D          2
#define GF2K_ID_F30           3
#define GF2K_ID_F31D          4
#define GF2K_ID_F305          5
#define GF2K_ID_F23P          6
#define GF2K_ID_F31           7
#define GF2K_ID_MAX           7

static char gf2k_length[] = { 40, 40, 40, 40, 40, 40, 40, 40 };
static char gf2k_hat_to_axis[][2] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

static char *gf2k_names[] = {"", "Genius G-09D", "Genius F-30D", "Genius F-30", "Genius MaxFighter F-31D",
                        "Genius F-30-5", "Genius Flight2000 F-23", "Genius F-31"};
static unsigned char gf2k_hats[] = { 0, 2, 0, 0, 2, 0, 2, 0 };
static unsigned char gf2k_axes[] = { 0, 2, 0, 0, 4, 0, 4, 0 };
static unsigned char gf2k_joys[] = { 0, 0, 0, 0,10, 0, 8, 0 };
static unsigned char gf2k_pads[] = { 0, 6, 0, 0, 0, 0, 0, 0 };
static unsigned char gf2k_lens[] = { 0,18, 0, 0,18, 0,18, 0 };

static unsigned char gf2k_abs[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, ABS_GAS, ABS_BRAKE };
static short gf2k_btn_joy[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 };
static short gf2k_btn_pad[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_START, BTN_SELECT };


static short gf2k_seq_reset[] = { 240, 340, 0 };
static short gf2k_seq_digital[] = { 590, 320, 860, 0 };

struct gf2k {
      struct gameport *gameport;
      struct input_dev *dev;
      int reads;
      int bads;
      unsigned char id;
      unsigned char length;
      char phys[32];
};

/*
 * gf2k_read_packet() reads a Genius Flight2000 packet.
 */

static int gf2k_read_packet(struct gameport *gameport, int length, char *data)
{
      unsigned char u, v;
      int i;
      unsigned int t, p;
      unsigned long flags;

      t = gameport_time(gameport, GF2K_START);
      p = gameport_time(gameport, GF2K_STROBE);

      i = 0;

      local_irq_save(flags);

      gameport_trigger(gameport);
      v = gameport_read(gameport);

      while (t > 0 && i < length) {
            t--; u = v;
            v = gameport_read(gameport);
            if (v & ~u & 0x10) {
                  data[i++] = v >> 5;
                  t = p;
            }
      }

      local_irq_restore(flags);

      return i;
}

/*
 * gf2k_trigger_seq() initializes a Genius Flight2000 joystick
 * into digital mode.
 */

static void gf2k_trigger_seq(struct gameport *gameport, short *seq)
{

      unsigned long flags;
      int i, t;

        local_irq_save(flags);

      i = 0;
        do {
            gameport_trigger(gameport);
            t = gameport_time(gameport, GF2K_TIMEOUT * 1000);
            while ((gameport_read(gameport) & 1) && t) t--;
                udelay(seq[i]);
        } while (seq[++i]);

      gameport_trigger(gameport);

      local_irq_restore(flags);
}

/*
 * js_sw_get_bits() composes bits from the triplet buffer into a __u64.
 * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
 * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
 * is number of bits per triplet.
 */

#define GB(p,n,s) gf2k_get_bits(data, p, n, s)

static int gf2k_get_bits(unsigned char *buf, int pos, int num, int shift)
{
      __u64 data = 0;
      int i;

      for (i = 0; i < num / 3 + 2; i++)
            data |= buf[pos / 3 + i] << (i * 3);
      data >>= pos % 3;
      data &= (1 << num) - 1;
      data <<= shift;

      return data;
}

static void gf2k_read(struct gf2k *gf2k, unsigned char *data)
{
      struct input_dev *dev = gf2k->dev;
      int i, t;

      for (i = 0; i < 4 && i < gf2k_axes[gf2k->id]; i++)
            input_report_abs(dev, gf2k_abs[i], GB(i<<3,8,0) | GB(i+46,1,8) | GB(i+50,1,9));

      for (i = 0; i < 2 && i < gf2k_axes[gf2k->id] - 4; i++)
            input_report_abs(dev, gf2k_abs[i], GB(i*9+60,8,0) | GB(i+54,1,9));

      t = GB(40,4,0);

      for (i = 0; i < gf2k_hats[gf2k->id]; i++)
            input_report_abs(dev, ABS_HAT0X + i, gf2k_hat_to_axis[t][i]);

      t = GB(44,2,0) | GB(32,8,2) | GB(78,2,10);

      for (i = 0; i < gf2k_joys[gf2k->id]; i++)
            input_report_key(dev, gf2k_btn_joy[i], (t >> i) & 1);

      for (i = 0; i < gf2k_pads[gf2k->id]; i++)
            input_report_key(dev, gf2k_btn_pad[i], (t >> i) & 1);

      input_sync(dev);
}

/*
 * gf2k_poll() reads and analyzes Genius joystick data.
 */

static void gf2k_poll(struct gameport *gameport)
{
      struct gf2k *gf2k = gameport_get_drvdata(gameport);
      unsigned char data[GF2K_LENGTH];

      gf2k->reads++;

      if (gf2k_read_packet(gf2k->gameport, gf2k_length[gf2k->id], data) < gf2k_length[gf2k->id])
            gf2k->bads++;
      else
            gf2k_read(gf2k, data);
}

static int gf2k_open(struct input_dev *dev)
{
      struct gf2k *gf2k = input_get_drvdata(dev);

      gameport_start_polling(gf2k->gameport);
      return 0;
}

static void gf2k_close(struct input_dev *dev)
{
      struct gf2k *gf2k = input_get_drvdata(dev);

      gameport_stop_polling(gf2k->gameport);
}

/*
 * gf2k_connect() probes for Genius id joysticks.
 */

static int gf2k_connect(struct gameport *gameport, struct gameport_driver *drv)
{
      struct gf2k *gf2k;
      struct input_dev *input_dev;
      unsigned char data[GF2K_LENGTH];
      int i, err;

      gf2k = kzalloc(sizeof(struct gf2k), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!gf2k || !input_dev) {
            err = -ENOMEM;
            goto fail1;
      }

      gf2k->gameport = gameport;
      gf2k->dev = input_dev;

      gameport_set_drvdata(gameport, gf2k);

      err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
      if (err)
            goto fail1;

      gf2k_trigger_seq(gameport, gf2k_seq_reset);

      msleep(GF2K_TIMEOUT);

      gf2k_trigger_seq(gameport, gf2k_seq_digital);

      msleep(GF2K_TIMEOUT);

      if (gf2k_read_packet(gameport, GF2K_LENGTH, data) < 12) {
            err = -ENODEV;
            goto fail2;
      }

      if (!(gf2k->id = GB(7,2,0) | GB(3,3,2) | GB(0,3,5))) {
            err = -ENODEV;
            goto fail2;
      }

#ifdef RESET_WORKS
      if ((gf2k->id != (GB(19,2,0) | GB(15,3,2) | GB(12,3,5))) ||
          (gf2k->id != (GB(31,2,0) | GB(27,3,2) | GB(24,3,5)))) {
            err = -ENODEV;
            goto fail2;
      }
#else
      gf2k->id = 6;
#endif

      if (gf2k->id > GF2K_ID_MAX || !gf2k_axes[gf2k->id]) {
            printk(KERN_WARNING "gf2k.c: Not yet supported joystick on %s. [id: %d type:%s]\n",
                  gameport->phys, gf2k->id, gf2k->id > GF2K_ID_MAX ? "Unknown" : gf2k_names[gf2k->id]);
            err = -ENODEV;
            goto fail2;
      }

      gameport_set_poll_handler(gameport, gf2k_poll);
      gameport_set_poll_interval(gameport, 20);

      snprintf(gf2k->phys, sizeof(gf2k->phys), "%s/input0", gameport->phys);

      gf2k->length = gf2k_lens[gf2k->id];

      input_dev->name = gf2k_names[gf2k->id];
      input_dev->phys = gf2k->phys;
      input_dev->id.bustype = BUS_GAMEPORT;
      input_dev->id.vendor = GAMEPORT_ID_VENDOR_GENIUS;
      input_dev->id.product = gf2k->id;
      input_dev->id.version = 0x0100;
      input_dev->dev.parent = &gameport->dev;

      input_set_drvdata(input_dev, gf2k);

      input_dev->open = gf2k_open;
      input_dev->close = gf2k_close;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

      for (i = 0; i < gf2k_axes[gf2k->id]; i++)
            set_bit(gf2k_abs[i], input_dev->absbit);

      for (i = 0; i < gf2k_hats[gf2k->id]; i++) {
            set_bit(ABS_HAT0X + i, input_dev->absbit);
            input_dev->absmin[ABS_HAT0X + i] = -1;
            input_dev->absmax[ABS_HAT0X + i] = 1;
      }

      for (i = 0; i < gf2k_joys[gf2k->id]; i++)
            set_bit(gf2k_btn_joy[i], input_dev->keybit);

      for (i = 0; i < gf2k_pads[gf2k->id]; i++)
            set_bit(gf2k_btn_pad[i], input_dev->keybit);

      gf2k_read_packet(gameport, gf2k->length, data);
      gf2k_read(gf2k, data);

      for (i = 0; i < gf2k_axes[gf2k->id]; i++) {
            input_dev->absmax[gf2k_abs[i]] = (i < 2) ? input_dev->abs[gf2k_abs[i]] * 2 - 32 :
                    input_dev->abs[gf2k_abs[0]] + input_dev->abs[gf2k_abs[1]] - 32;
            input_dev->absmin[gf2k_abs[i]] = 32;
            input_dev->absfuzz[gf2k_abs[i]] = 8;
            input_dev->absflat[gf2k_abs[i]] = (i < 2) ? 24 : 0;
      }

      err = input_register_device(gf2k->dev);
      if (err)
            goto fail2;

      return 0;

 fail2:     gameport_close(gameport);
 fail1:     gameport_set_drvdata(gameport, NULL);
      input_free_device(input_dev);
      kfree(gf2k);
      return err;
}

static void gf2k_disconnect(struct gameport *gameport)
{
      struct gf2k *gf2k = gameport_get_drvdata(gameport);

      input_unregister_device(gf2k->dev);
      gameport_close(gameport);
      gameport_set_drvdata(gameport, NULL);
      kfree(gf2k);
}

static struct gameport_driver gf2k_drv = {
      .driver           = {
            .name = "gf2k",
      },
      .description      = DRIVER_DESC,
      .connect    = gf2k_connect,
      .disconnect = gf2k_disconnect,
};

static int __init gf2k_init(void)
{
      gameport_register_driver(&gf2k_drv);
      return 0;
}

static void __exit gf2k_exit(void)
{
      gameport_unregister_driver(&gf2k_drv);
}

module_init(gf2k_init);
module_exit(gf2k_exit);

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