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iforce-packets.c

/*
 * $Id: iforce-packets.c,v 1.16 2002/07/07 10:22:50 jdeneux Exp $
 *
 *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
 *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
 *
 *  USB/RS232 I-Force joysticks and wheels.
 */

/*
 * 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 "iforce.h"

static struct {
      __s32 x;
      __s32 y;
} iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};


void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
{
      int i;

      printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
      for (i = 0; i < LO(cmd); i++)
            printk("%02x ", data[i]);
      printk("\n");
}

/*
 * Send a packet of bytes to the device
 */
int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
{
      /* Copy data to buffer */
      int n = LO(cmd);
      int c;
      int empty;
      int head, tail;
      unsigned long flags;

/*
 * Update head and tail of xmit buffer
 */
      spin_lock_irqsave(&iforce->xmit_lock, flags);

      head = iforce->xmit.head;
      tail = iforce->xmit.tail;


      if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
            warn("not enough space in xmit buffer to send new packet");
            spin_unlock_irqrestore(&iforce->xmit_lock, flags);
            return -1;
      }

      empty = head == tail;
      XMIT_INC(iforce->xmit.head, n+2);

/*
 * Store packet in xmit buffer
 */
      iforce->xmit.buf[head] = HI(cmd);
      XMIT_INC(head, 1);
      iforce->xmit.buf[head] = LO(cmd);
      XMIT_INC(head, 1);

      c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
      if (n < c) c=n;

      memcpy(&iforce->xmit.buf[head],
             data,
             c);
      if (n != c) {
            memcpy(&iforce->xmit.buf[0],
                   data + c,
                   n - c);
      }
      XMIT_INC(head, n);

      spin_unlock_irqrestore(&iforce->xmit_lock, flags);
/*
 * If necessary, start the transmission
 */
      switch (iforce->bus) {

#ifdef CONFIG_JOYSTICK_IFORCE_232
            case IFORCE_232:
            if (empty)
                  iforce_serial_xmit(iforce);
            break;
#endif
#ifdef CONFIG_JOYSTICK_IFORCE_USB
            case IFORCE_USB:

            if (iforce->usbdev && empty &&
                  !test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {

                  iforce_usb_xmit(iforce);
            }
            break;
#endif
      }
      return 0;
}

/* Start or stop an effect */
int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
{
      unsigned char data[3];

      data[0] = LO(id);
      data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
      data[2] = LO(value);
      return iforce_send_packet(iforce, FF_CMD_PLAY, data);
}

/* Mark an effect that was being updated as ready. That means it can be updated
 * again */
static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
{
      int i;

      if (!iforce->dev->ff)
            return 0;

      for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
            if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
                (iforce->core_effects[i].mod1_chunk.start == addr ||
                 iforce->core_effects[i].mod2_chunk.start == addr)) {
                  clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
                  return 0;
            }
      }
      warn("unused effect %04x updated !!!", addr);
      return -1;
}

void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
{
      struct input_dev *dev = iforce->dev;
      int i;
      static int being_used = 0;

      if (being_used)
            warn("re-entrant call to iforce_process %d", being_used);
      being_used++;

#ifdef CONFIG_JOYSTICK_IFORCE_232
      if (HI(iforce->expect_packet) == HI(cmd)) {
            iforce->expect_packet = 0;
            iforce->ecmd = cmd;
            memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
      }
#endif
      wake_up(&iforce->wait);

      if (!iforce->type) {
            being_used--;
            return;
      }

      switch (HI(cmd)) {

            case 0x01:  /* joystick position data */
            case 0x03:  /* wheel position data */
                  if (HI(cmd) == 1) {
                        input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
                        input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
                        input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
                        if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
                              input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
                  } else {
                        input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
                        input_report_abs(dev, ABS_GAS,   255 - data[2]);
                        input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
                  }

                  input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
                  input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);

                  for (i = 0; iforce->type->btn[i] >= 0; i++)
                        input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));

                  /* If there are untouched bits left, interpret them as the second hat */
                  if (i <= 8) {
                        int btns = data[6];
                        if (test_bit(ABS_HAT1X, dev->absbit)) {
                              if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
                              else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
                              else input_report_abs(dev, ABS_HAT1X, 0);
                        }
                        if (test_bit(ABS_HAT1Y, dev->absbit)) {
                              if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
                              else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
                              else input_report_abs(dev, ABS_HAT1Y, 0);
                        }
                  }

                  input_sync(dev);

                  break;

            case 0x02:  /* status report */
                  input_report_key(dev, BTN_DEAD, data[0] & 0x02);
                  input_sync(dev);

                  /* Check if an effect was just started or stopped */
                  i = data[1] & 0x7f;
                  if (data[1] & 0x80) {
                        if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
                              /* Report play event */
                              input_report_ff_status(dev, i, FF_STATUS_PLAYING);
                        }
                  } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
                        /* Report stop event */
                        input_report_ff_status(dev, i, FF_STATUS_STOPPED);
                  }
                  if (LO(cmd) > 3) {
                        int j;
                        for (j = 3; j < LO(cmd); j += 2)
                              mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
                  }
                  break;
      }
      being_used--;
}

int iforce_get_id_packet(struct iforce *iforce, char *packet)
{
      switch (iforce->bus) {

      case IFORCE_USB: {
#ifdef CONFIG_JOYSTICK_IFORCE_USB
            int status;

            iforce->cr.bRequest = packet[0];
            iforce->ctrl->dev = iforce->usbdev;

            status = usb_submit_urb(iforce->ctrl, GFP_ATOMIC);
            if (status) {
                  err("usb_submit_urb failed %d", status);
                  return -1;
            }

            wait_event_interruptible_timeout(iforce->wait,
                  iforce->ctrl->status != -EINPROGRESS, HZ);

            if (iforce->ctrl->status) {
                  dbg("iforce->ctrl->status = %d", iforce->ctrl->status);
                  usb_unlink_urb(iforce->ctrl);
                  return -1;
            }
#else
            dbg("iforce_get_id_packet: iforce->bus = USB!");
#endif
            }
            break;

      case IFORCE_232:

#ifdef CONFIG_JOYSTICK_IFORCE_232
            iforce->expect_packet = FF_CMD_QUERY;
            iforce_send_packet(iforce, FF_CMD_QUERY, packet);

            wait_event_interruptible_timeout(iforce->wait,
                  !iforce->expect_packet, HZ);

            if (iforce->expect_packet) {
                  iforce->expect_packet = 0;
                  return -1;
            }
#else
            err("iforce_get_id_packet: iforce->bus = SERIO!");
#endif
            break;

      default:
            err("iforce_get_id_packet: iforce->bus = %d", iforce->bus);
            break;
      }

      return -(iforce->edata[0] != packet[0]);
}


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