LXR linux/drivers/input/joystick/iforce/iforce-packets.c

   1/*
   2 *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
   3 *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
   4 *
   5 *  USB/RS232 I-Force joysticks and wheels.
   6 */
   7
   8/*
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22 *
  23 * Should you need to contact me, the author, you can do so either by
  24 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  25 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  26 */
  27
  28#include "iforce.h"
  29
  30static struct {
  31        __s32 x;
  32        __s32 y;
  33} iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  34
  35
  36void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
  37{
  38        int i;
  39
  40        printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
  41        for (i = 0; i < LO(cmd); i++)
  42                printk("%02x ", data[i]);
  43        printk("\n");
  44}
  45
  46/*
  47 * Send a packet of bytes to the device
  48 */
  49int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
  50{
  51        /* Copy data to buffer */
  52        int n = LO(cmd);
  53        int c;
  54        int empty;
  55        int head, tail;
  56        unsigned long flags;
  57
  58/*
  59 * Update head and tail of xmit buffer
  60 */
  61        spin_lock_irqsave(&iforce->xmit_lock, flags);
  62
  63        head = iforce->xmit.head;
  64        tail = iforce->xmit.tail;
  65
  66
  67        if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
  68                dev_warn(&iforce->dev->dev,
  69                         "not enough space in xmit buffer to send new packet\n");
  70                spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  71                return -1;
  72        }
  73
  74        empty = head == tail;
  75        XMIT_INC(iforce->xmit.head, n+2);
  76
  77/*
  78 * Store packet in xmit buffer
  79 */
  80        iforce->xmit.buf[head] = HI(cmd);
  81        XMIT_INC(head, 1);
  82        iforce->xmit.buf[head] = LO(cmd);
  83        XMIT_INC(head, 1);
  84
  85        c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
  86        if (n < c) c=n;
  87
  88        memcpy(&iforce->xmit.buf[head],
  89               data,
  90               c);
  91        if (n != c) {
  92                memcpy(&iforce->xmit.buf[0],
  93                       data + c,
  94                       n - c);
  95        }
  96        XMIT_INC(head, n);
  97
  98        spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  99/*
 100 * If necessary, start the transmission
 101 */
 102        switch (iforce->bus) {
 103
 104#ifdef CONFIG_JOYSTICK_IFORCE_232
 105                case IFORCE_232:
 106                if (empty)
 107                        iforce_serial_xmit(iforce);
 108                break;
 109#endif
 110#ifdef CONFIG_JOYSTICK_IFORCE_USB
 111                case IFORCE_USB:
 112
 113                if (iforce->usbdev && empty &&
 114                        !test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
 115
 116                        iforce_usb_xmit(iforce);
 117                }
 118                break;
 119#endif
 120        }
 121        return 0;
 122}
 123
 124/* Start or stop an effect */
 125int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
 126{
 127        unsigned char data[3];
 128
 129        data[0] = LO(id);
 130        data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
 131        data[2] = LO(value);
 132        return iforce_send_packet(iforce, FF_CMD_PLAY, data);
 133}
 134
 135/* Mark an effect that was being updated as ready. That means it can be updated
 136 * again */
 137static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
 138{
 139        int i;
 140
 141        if (!iforce->dev->ff)
 142                return 0;
 143
 144        for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
 145                if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
 146                    (iforce->core_effects[i].mod1_chunk.start == addr ||
 147                     iforce->core_effects[i].mod2_chunk.start == addr)) {
 148                        clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
 149                        return 0;
 150                }
 151        }
 152        dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
 153        return -1;
 154}
 155
 156void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
 157{
 158        struct input_dev *dev = iforce->dev;
 159        int i;
 160        static int being_used = 0;
 161
 162        if (being_used)
 163                dev_warn(&iforce->dev->dev,
 164                         "re-entrant call to iforce_process %d\n", being_used);
 165        being_used++;
 166
 167#ifdef CONFIG_JOYSTICK_IFORCE_232
 168        if (HI(iforce->expect_packet) == HI(cmd)) {
 169                iforce->expect_packet = 0;
 170                iforce->ecmd = cmd;
 171                memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
 172        }
 173#endif
 174        wake_up(&iforce->wait);
 175
 176        if (!iforce->type) {
 177                being_used--;
 178                return;
 179        }
 180
 181        switch (HI(cmd)) {
 182
 183                case 0x01:      /* joystick position data */
 184                case 0x03:      /* wheel position data */
 185                        if (HI(cmd) == 1) {
 186                                input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
 187                                input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
 188                                input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
 189                                if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
 190                                        input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
 191                        } else {
 192                                input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
 193                                input_report_abs(dev, ABS_GAS,   255 - data[2]);
 194                                input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
 195                        }
 196
 197                        input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
 198                        input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
 199
 200                        for (i = 0; iforce->type->btn[i] >= 0; i++)
 201                                input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));
 202
 203                        /* If there are untouched bits left, interpret them as the second hat */
 204                        if (i <= 8) {
 205                                int btns = data[6];
 206                                if (test_bit(ABS_HAT1X, dev->absbit)) {
 207                                        if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
 208                                        else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
 209                                        else input_report_abs(dev, ABS_HAT1X, 0);
 210                                }
 211                                if (test_bit(ABS_HAT1Y, dev->absbit)) {
 212                                        if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
 213                                        else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
 214                                        else input_report_abs(dev, ABS_HAT1Y, 0);
 215                                }
 216                        }
 217
 218                        input_sync(dev);
 219
 220                        break;
 221
 222                case 0x02:      /* status report */
 223                        input_report_key(dev, BTN_DEAD, data[0] & 0x02);
 224                        input_sync(dev);
 225
 226                        /* Check if an effect was just started or stopped */
 227                        i = data[1] & 0x7f;
 228                        if (data[1] & 0x80) {
 229                                if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 230                                        /* Report play event */
 231                                        input_report_ff_status(dev, i, FF_STATUS_PLAYING);
 232                                }
 233                        } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 234                                /* Report stop event */
 235                                input_report_ff_status(dev, i, FF_STATUS_STOPPED);
 236                        }
 237                        if (LO(cmd) > 3) {
 238                                int j;
 239                                for (j = 3; j < LO(cmd); j += 2)
 240                                        mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
 241                        }
 242                        break;
 243        }
 244        being_used--;
 245}
 246
 247int iforce_get_id_packet(struct iforce *iforce, char *packet)
 248{
 249        switch (iforce->bus) {
 250
 251        case IFORCE_USB: {
 252#ifdef CONFIG_JOYSTICK_IFORCE_USB
 253                int status;
 254
 255                iforce->cr.bRequest = packet[0];
 256                iforce->ctrl->dev = iforce->usbdev;
 257
 258                status = usb_submit_urb(iforce->ctrl, GFP_ATOMIC);
 259                if (status) {
 260                        err("usb_submit_urb failed %d", status);
 261                        return -1;
 262                }
 263
 264                wait_event_interruptible_timeout(iforce->wait,
 265                        iforce->ctrl->status != -EINPROGRESS, HZ);
 266
 267                if (iforce->ctrl->status) {
 268                        dbg("iforce->ctrl->status = %d", iforce->ctrl->status);
 269                        usb_unlink_urb(iforce->ctrl);
 270                        return -1;
 271                }
 272#else
 273                dbg("iforce_get_id_packet: iforce->bus = USB!");
 274#endif
 275                }
 276                break;
 277
 278        case IFORCE_232:
 279
 280#ifdef CONFIG_JOYSTICK_IFORCE_232
 281                iforce->expect_packet = FF_CMD_QUERY;
 282                iforce_send_packet(iforce, FF_CMD_QUERY, packet);
 283
 284                wait_event_interruptible_timeout(iforce->wait,
 285                        !iforce->expect_packet, HZ);
 286
 287                if (iforce->expect_packet) {
 288                        iforce->expect_packet = 0;
 289                        return -1;
 290                }
 291#else
 292                err("iforce_get_id_packet: iforce->bus = SERIO!");
 293#endif
 294                break;
 295
 296        default:
 297                err("iforce_get_id_packet: iforce->bus = %d", iforce->bus);
 298                break;
 299        }
 300
 301        return -(iforce->edata[0] != packet[0]);
 302}
 303
 304