Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 807 insertions, 0 deletions

diff --git a/drivers/input/joystick/sidewinder.c b/drivers/input/joystick/sidewinder.c
new file mode 100644
index 000000000000..47144a7ed9e7
--- /dev/null
+++ b/drivers/input/joystick/sidewinder.c
@@ -0,0 +1,807 @@
+/*
+ *  Copyright (c) 1998-2005 Vojtech Pavlik
+ */
+
+/*
+ * Microsoft SideWinder joystick family 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/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/gameport.h>
+
+#define DRIVER_DESC     "Microsoft SideWinder joystick family driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * These are really magic values. Changing them can make a problem go away,
+ * as well as break everything.
+ */
+
+#undef SW_DEBUG
+#undef SW_DEBUG_DATA
+
+#define SW_START        600     /* The time we wait for the first bit [600 us] */
+#define SW_STROBE       60      /* Max time per bit [60 us] */
+#define SW_TIMEOUT      6       /* Wait for everything to settle [6 ms] */
+#define SW_KICK         45      /* Wait after A0 fall till kick [45 us] */
+#define SW_END          8       /* Number of bits before end of packet to kick */
+#define SW_FAIL         16      /* Number of packet read errors to fail and reinitialize */
+#define SW_BAD          2       /* Number of packet read errors to switch off 3d Pro optimization */
+#define SW_OK           64      /* Number of packet read successes to switch optimization back on */
+#define SW_LENGTH       512     /* Max number of bits in a packet */
+
+#ifdef SW_DEBUG
+#define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+/*
+ * SideWinder joystick types ...
+ */
+
+#define SW_ID_3DP       0
+#define SW_ID_GP        1
+#define SW_ID_PP        2
+#define SW_ID_FFP       3
+#define SW_ID_FSP       4
+#define SW_ID_FFW       5
+
+/*
+ * Names, buttons, axes ...
+ */
+
+static char *sw_name[] = {      "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
+                                "Force Feedback Wheel" };
+
+static char sw_abs[][7] = {
+        { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+        { ABS_X, ABS_Y },
+        { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+        { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+        { ABS_X, ABS_Y,         ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+        { ABS_RX, ABS_RUDDER,   ABS_THROTTLE }};
+
+static char sw_bit[][7] = {
+        { 10, 10,  9, 10,  1,  1 },
+        {  1,  1                 },
+        { 10, 10,  6,  7,  1,  1 },
+        { 10, 10,  6,  7,  1,  1 },
+        { 10, 10,  6,  1,  1     },
+        { 10,  7,  7,  1,  1     }};
+
+static short sw_btn[][12] = {
+        { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
+        { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
+        { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+        { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+        { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
+        { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};
+
+static struct {
+        int x;
+        int y;
+} sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
+
+struct sw {
+        struct gameport *gameport;
+        struct input_dev dev[4];
+        char name[64];
+        char phys[4][32];
+        int length;
+        int type;
+        int bits;
+        int number;
+        int fail;
+        int ok;
+        int reads;
+        int bads;
+};
+
+/*
+ * sw_read_packet() is a function which reads either a data packet, or an
+ * identification packet from a SideWinder joystick. The protocol is very,
+ * very, very braindamaged. Microsoft patented it in US patent #5628686.
+ */
+
+static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
+{
+        unsigned long flags;
+        int timeout, bitout, sched, i, kick, start, strobe;
+        unsigned char pending, u, v;
+
+        i = -id;                                                /* Don't care about data, only want ID */
+        timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
+        kick = id ? gameport_time(gameport, SW_KICK) : 0;       /* Set up kick timeout for ID packet */
+        start = gameport_time(gameport, SW_START);
+        strobe = gameport_time(gameport, SW_STROBE);
+        bitout = start;
+        pending = 0;
+        sched = 0;
+
+        local_irq_save(flags);                                  /* Quiet, please */
+
+        gameport_trigger(gameport);                             /* Trigger */
+        v = gameport_read(gameport);
+
+        do {
+                bitout--;
+                u = v;
+                v = gameport_read(gameport);
+        } while (!(~v & u & 0x10) && (bitout > 0));             /* Wait for first falling edge on clock */
+
+        if (bitout > 0)
+                bitout = strobe;                                /* Extend time if not timed out */
+
+        while ((timeout > 0 || bitout > 0) && (i < length)) {
+
+                timeout--;
+                bitout--;                                       /* Decrement timers */
+                sched--;
+
+                u = v;
+                v = gameport_read(gameport);
+
+                if ((~u & v & 0x10) && (bitout > 0)) {          /* Rising edge on clock - data bit */
+                        if (i >= 0)                             /* Want this data */
+                                buf[i] = v >> 5;                /* Store it */
+                        i++;                                    /* Advance index */
+                        bitout = strobe;                        /* Extend timeout for next bit */
+                }
+
+                if (kick && (~v & u & 0x01)) {                  /* Falling edge on axis 0 */
+                        sched = kick;                           /* Schedule second trigger */
+                        kick = 0;                               /* Don't schedule next time on falling edge */
+                        pending = 1;                            /* Mark schedule */
+                }
+
+                if (pending && sched < 0 && (i > -SW_END)) {    /* Second trigger time */
+                        gameport_trigger(gameport);             /* Trigger */
+                        bitout = start;                         /* Long bit timeout */
+                        pending = 0;                            /* Unmark schedule */
+                        timeout = 0;                            /* Switch from global to bit timeouts */
+                }
+        }
+
+        local_irq_restore(flags);                                       /* Done - relax */
+
+#ifdef SW_DEBUG_DATA
+        {
+                int j;
+                printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
+                for (j = 0; j < i; j++) printk("%d", buf[j]);
+                printk("]\n");
+        }
+#endif
+
+        return i;
+}
+
+/*
+ * sw_get_bits() and GB() compose 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(pos,num) sw_get_bits(buf, pos, num, sw->bits)
+
+static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
+{
+        __u64 data = 0;
+        int tri = pos % bits;                                           /* Start position */
+        int i   = pos / bits;
+        int bit = 0;
+
+        while (num--) {
+                data |= (__u64)((buf[i] >> tri++) & 1) << bit++;        /* Transfer bit */
+                if (tri == bits) {
+                        i++;                                            /* Next triplet */
+                        tri = 0;
+                }
+        }
+
+        return data;
+}
+
+/*
+ * sw_init_digital() initializes a SideWinder 3D Pro joystick
+ * into digital mode.
+ */
+
+static void sw_init_digital(struct gameport *gameport)
+{
+        int seq[] = { 140, 140+725, 140+300, 0 };
+        unsigned long flags;
+        int i, t;
+
+        local_irq_save(flags);
+
+        i = 0;
+        do {
+                gameport_trigger(gameport);                     /* Trigger */
+                t = gameport_time(gameport, SW_TIMEOUT * 1000);
+                while ((gameport_read(gameport) & 1) && t) t--; /* Wait for axis to fall back to 0 */
+                udelay(seq[i]);                                 /* Delay magic time */
+        } while (seq[++i]);
+
+        gameport_trigger(gameport);                             /* Last trigger */
+
+        local_irq_restore(flags);
+}
+
+/*
+ * sw_parity() computes parity of __u64
+ */
+
+static int sw_parity(__u64 t)
+{
+        int x = t ^ (t >> 32);
+
+        x ^= x >> 16;
+        x ^= x >> 8;
+        x ^= x >> 4;
+        x ^= x >> 2;
+        x ^= x >> 1;
+        return x & 1;
+}
+
+/*
+ * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
+ */
+
+static int sw_check(__u64 t)
+{
+        unsigned char sum = 0;
+
+        if ((t & 0x8080808080808080ULL) ^ 0x80)                 /* Sync */
+                return -1;
+
+        while (t) {                                             /* Sum */
+                sum += t & 0xf;
+                t >>= 4;
+        }
+
+        return sum & 0xf;
+}
+
+/*
+ * sw_parse() analyzes SideWinder joystick data, and writes the results into
+ * the axes and buttons arrays.
+ */
+
+static int sw_parse(unsigned char *buf, struct sw *sw)
+{
+        int hat, i, j;
+        struct input_dev *dev = sw->dev;
+
+        switch (sw->type) {
+
+                case SW_ID_3DP:
+
+                        if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
+                                return -1;
+
+                        input_report_abs(dev, ABS_X,        (GB( 3,3) << 7) | GB(16,7));
+                        input_report_abs(dev, ABS_Y,        (GB( 0,3) << 7) | GB(24,7));
+                        input_report_abs(dev, ABS_RZ,       (GB(35,2) << 7) | GB(40,7));
+                        input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));
+
+                        input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+                        input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+                        for (j = 0; j < 7; j++)
+                                input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));
+
+                        input_report_key(dev, BTN_BASE4, !GB(38,1));
+                        input_report_key(dev, BTN_BASE5, !GB(37,1));
+
+                        input_sync(dev);
+
+                        return 0;
+
+                case SW_ID_GP:
+
+                        for (i = 0; i < sw->number; i ++) {
+
+                                if (sw_parity(GB(i*15,15)))
+                                        return -1;
+
+                                input_report_abs(dev + i, ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
+                                input_report_abs(dev + i, ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));
+
+                                for (j = 0; j < 10; j++)
+                                        input_report_key(dev + i, sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));
+
+                                input_sync(dev + i);
+                        }
+
+                        return 0;
+
+                case SW_ID_PP:
+                case SW_ID_FFP:
+
+                        if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
+                                return -1;
+
+                        input_report_abs(dev, ABS_X,        GB( 9,10));
+                        input_report_abs(dev, ABS_Y,        GB(19,10));
+                        input_report_abs(dev, ABS_RZ,       GB(36, 6));
+                        input_report_abs(dev, ABS_THROTTLE, GB(29, 7));
+
+                        input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+                        input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+                        for (j = 0; j < 9; j++)
+                                input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));
+
+                        input_sync(dev);
+
+                        return 0;
+
+                case SW_ID_FSP:
+
+                        if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
+                                return -1;
+
+                        input_report_abs(dev, ABS_X,        GB( 0,10));
+                        input_report_abs(dev, ABS_Y,        GB(16,10));
+                        input_report_abs(dev, ABS_THROTTLE, GB(32, 6));
+
+                        input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+                        input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+                        for (j = 0; j < 6; j++)
+                                input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));
+
+                        input_report_key(dev, BTN_TR,     !GB(26,1));
+                        input_report_key(dev, BTN_START,  !GB(27,1));
+                        input_report_key(dev, BTN_MODE,   !GB(38,1));
+                        input_report_key(dev, BTN_SELECT, !GB(39,1));
+
+                        input_sync(dev);
+
+                        return 0;
+
+                case SW_ID_FFW:
+
+                        if (!sw_parity(GB(0,33)))
+                                return -1;
+
+                        input_report_abs(dev, ABS_RX,       GB( 0,10));
+                        input_report_abs(dev, ABS_RUDDER,   GB(10, 6));
+                        input_report_abs(dev, ABS_THROTTLE, GB(16, 6));
+
+                        for (j = 0; j < 8; j++)
+                                input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));
+
+                        input_sync(dev);
+
+                        return 0;
+        }
+
+        return -1;
+}
+
+/*
+ * sw_read() reads SideWinder joystick data, and reinitializes
+ * the joystick in case of persistent problems. This is the function that is
+ * called from the generic code to poll the joystick.
+ */
+
+static int sw_read(struct sw *sw)
+{
+        unsigned char buf[SW_LENGTH];
+        int i;
+
+        i = sw_read_packet(sw->gameport, buf, sw->length, 0);
+
+        if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) {             /* Broken packet, try to fix */
+
+                if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) {            /* Last init failed, 1 bit mode */
+                        printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
+                                " - going to reinitialize.\n", sw->gameport->phys);
+                        sw->fail = SW_FAIL;                                     /* Reinitialize */
+                        i = 128;                                                /* Bogus value */
+                }
+
+                if (i < 66 && GB(0,64) == GB(i*3-66,64))                        /* 1 == 3 */
+                        i = 66;                                                 /* Everything is fine */
+
+                if (i < 66 && GB(0,64) == GB(66,64))                            /* 1 == 2 */
+                        i = 66;                                                 /* Everything is fine */
+
+                if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) {                /* 2 == 3 */
+                        memmove(buf, buf + i - 22, 22);                         /* Move data */
+                        i = 66;                                                 /* Carry on */
+                }
+        }
+
+        if (i == sw->length && !sw_parse(buf, sw)) {                            /* Parse data */
+
+                sw->fail = 0;
+                sw->ok++;
+
+                if (sw->type == SW_ID_3DP && sw->length == 66                   /* Many packets OK */
+                        && sw->ok > SW_OK) {
+
+                        printk(KERN_INFO "sidewinder.c: No more trouble on %s"
+                                " - enabling optimization again.\n", sw->gameport->phys);
+                        sw->length = 22;
+                }
+
+                return 0;
+        }
+
+        sw->ok = 0;
+        sw->fail++;
+
+        if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) {   /* Consecutive bad packets */
+
+                printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
+                        " - disabling optimization.\n", sw->gameport->phys);
+                sw->length = 66;
+        }
+
+        if (sw->fail < SW_FAIL)
+                return -1;                                                      /* Not enough, don't reinitialize yet */
+
+        printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
+                " - reinitializing joystick.\n", sw->gameport->phys);
+
+        if (!i && sw->type == SW_ID_3DP) {                                      /* 3D Pro can be in analog mode */
+                mdelay(3 * SW_TIMEOUT);
+                sw_init_digital(sw->gameport);
+        }
+
+        mdelay(SW_TIMEOUT);
+        i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0);                    /* Read normal data packet */
+        mdelay(SW_TIMEOUT);
+        sw_read_packet(sw->gameport, buf, SW_LENGTH, i);                        /* Read ID packet, this initializes the stick */
+
+        sw->fail = SW_FAIL;
+
+        return -1;
+}
+
+static void sw_poll(struct gameport *gameport)
+{
+        struct sw *sw = gameport_get_drvdata(gameport);
+
+        sw->reads++;
+        if (sw_read(sw))
+                sw->bads++;
+}
+
+static int sw_open(struct input_dev *dev)
+{
+        struct sw *sw = dev->private;
+
+        gameport_start_polling(sw->gameport);
+        return 0;
+}
+
+static void sw_close(struct input_dev *dev)
+{
+        struct sw *sw = dev->private;
+
+        gameport_stop_polling(sw->gameport);
+}
+
+/*
+ * sw_print_packet() prints the contents of a SideWinder packet.
+ */
+
+static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
+{
+        int i;
+
+        printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
+        for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
+                printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
+        printk("]\n");
+}
+
+/*
+ * sw_3dp_id() translates the 3DP id into a human legible string.
+ * Unfortunately I don't know how to do this for the other SW types.
+ */
+
+static void sw_3dp_id(unsigned char *buf, char *comment)
+{
+        int i;
+        char pnp[8], rev[9];
+
+        for (i = 0; i < 7; i++)                                         /* ASCII PnP ID */
+                pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);
+
+        for (i = 0; i < 8; i++)                                         /* ASCII firmware revision */
+                rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);
+
+        pnp[7] = rev[8] = 0;
+
+        sprintf(comment, " [PnP %d.%02d id %s rev %s]",
+                (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |               /* Two 6-bit values */
+                        sw_get_bits(buf, 16, 6, 1)) / 100,
+                (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
+                        sw_get_bits(buf, 16, 6, 1)) % 100,
+                 pnp, rev);
+}
+
+/*
+ * sw_guess_mode() checks the upper two button bits for toggling -
+ * indication of that the joystick is in 3-bit mode. This is documented
+ * behavior for 3DP ID packet, and for example the FSP does this in
+ * normal packets instead. Fun ...
+ */
+
+static int sw_guess_mode(unsigned char *buf, int len)
+{
+        int i;
+        unsigned char xor = 0;
+
+        for (i = 1; i < len; i++)
+                xor |= (buf[i - 1] ^ buf[i]) & 6;
+
+        return !!xor * 2 + 1;
+}
+
+/*
+ * sw_connect() probes for SideWinder type joysticks.
+ */
+
+static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
+{
+        struct sw *sw;
+        int i, j, k, l;
+        int err;
+        unsigned char *buf = NULL;      /* [SW_LENGTH] */
+        unsigned char *idbuf = NULL;    /* [SW_LENGTH] */
+        unsigned char m = 1;
+        char comment[40];
+
+        comment[0] = 0;
+
+        sw = kcalloc(1, sizeof(struct sw), GFP_KERNEL);
+        buf = kmalloc(SW_LENGTH, GFP_KERNEL);
+        idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
+        if (!sw || !buf || !idbuf) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        sw->gameport = gameport;
+
+        gameport_set_drvdata(gameport, sw);
+
+        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
+        if (err)
+                goto fail1;
+
+        dbg("Init 0: Opened %s, io %#x, speed %d",
+                gameport->phys, gameport->io, gameport->speed);
+
+        i = sw_read_packet(gameport, buf, SW_LENGTH, 0);                /* Read normal packet */
+        msleep(SW_TIMEOUT);
+        dbg("Init 1: Mode %d. Length %d.", m , i);
+
+        if (!i) {                                                       /* No data. 3d Pro analog mode? */
+                sw_init_digital(gameport);                              /* Switch to digital */
+                msleep(SW_TIMEOUT);
+                i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Retry reading packet */
+                msleep(SW_TIMEOUT);
+                dbg("Init 1b: Length %d.", i);
+                if (!i) {                                               /* No data -> FAIL */
+                        err = -ENODEV;
+                        goto fail2;
+                }
+        }
+
+        j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);              /* Read ID. This initializes the stick */
+        m |= sw_guess_mode(idbuf, j);                                   /* ID packet should carry mode info [3DP] */
+        dbg("Init 2: Mode %d. ID Length %d.", m, j);
+
+        if (j <= 0) {                                                   /* Read ID failed. Happens in 1-bit mode on PP */
+                msleep(SW_TIMEOUT);
+                i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Retry reading packet */
+                m |= sw_guess_mode(buf, i);
+                dbg("Init 2b: Mode %d. Length %d.", m, i);
+                if (!i) {
+                        err = -ENODEV;
+                        goto fail2;
+                }
+                msleep(SW_TIMEOUT);
+                j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);      /* Retry reading ID */
+                dbg("Init 2c: ID Length %d.", j);
+        }
+
+        sw->type = -1;
+        k = SW_FAIL;                                                    /* Try SW_FAIL times */
+        l = 0;
+
+        do {
+                k--;
+                msleep(SW_TIMEOUT);
+                i = sw_read_packet(gameport, buf, SW_LENGTH, 0);        /* Read data packet */
+                dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);
+
+                if (i > l) {                                            /* Longer? As we can only lose bits, it makes */
+                                                                        /* no sense to try detection for a packet shorter */
+                        l = i;                                          /* than the previous one */
+
+                        sw->number = 1;
+                        sw->gameport = gameport;
+                        sw->length = i;
+                        sw->bits = m;
+
+                        dbg("Init 3a: Case %d.\n", i * m);
+
+                        switch (i * m) {
+                                case 60:
+                                        sw->number++;
+                                case 45:                                /* Ambiguous packet length */
+                                        if (j <= 40) {                  /* ID length less or eq 40 -> FSP */
+                                case 43:
+                                                sw->type = SW_ID_FSP;
+                                                break;
+                                        }
+                                        sw->number++;
+                                case 30:
+                                        sw->number++;
+                                case 15:
+                                        sw->type = SW_ID_GP;
+                                        break;
+                                case 33:
+                                case 31:
+                                        sw->type = SW_ID_FFW;
+                                        break;
+                                case 48:                                /* Ambiguous */
+                                        if (j == 14) {                  /* ID length 14*3 -> FFP */
+                                                sw->type = SW_ID_FFP;
+                                                sprintf(comment, " [AC %s]", sw_get_bits(idbuf,38,1,3) ? "off" : "on");
+                                        } else
+                                        sw->type = SW_ID_PP;
+                                        break;
+                                case 66:
+                                        sw->bits = 3;
+                                case 198:
+                                        sw->length = 22;
+                                case 64:
+                                        sw->type = SW_ID_3DP;
+                                        if (j == 160) sw_3dp_id(idbuf, comment);
+                                        break;
+                        }
+                }
+
+        } while (k && sw->type == -1);
+
+        if (sw->type == -1) {
+                printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
+                        "on %s, contact <vojtech@ucw.cz>\n", gameport->phys);
+                sw_print_packet("ID", j * 3, idbuf, 3);
+                sw_print_packet("Data", i * m, buf, m);
+                err = -ENODEV;
+                goto fail2;
+        }
+
+#ifdef SW_DEBUG
+        sw_print_packet("ID", j * 3, idbuf, 3);
+        sw_print_packet("Data", i * m, buf, m);
+#endif
+
+        gameport_set_poll_handler(gameport, sw_poll);
+        gameport_set_poll_interval(gameport, 20);
+
+        k = i;
+        l = j;
+
+        for (i = 0; i < sw->number; i++) {
+                int bits, code;
+
+                sprintf(sw->name, "Microsoft SideWinder %s", sw_name[sw->type]);
+                sprintf(sw->phys[i], "%s/input%d", gameport->phys, i);
+
+                sw->dev[i].private = sw;
+
+                sw->dev[i].open = sw_open;
+                sw->dev[i].close = sw_close;
+
+                sw->dev[i].name = sw->name;
+                sw->dev[i].phys = sw->phys[i];
+                sw->dev[i].id.bustype = BUS_GAMEPORT;
+                sw->dev[i].id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
+                sw->dev[i].id.product = sw->type;
+                sw->dev[i].id.version = 0x0100;
+
+                sw->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+
+                for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
+                        code = sw_abs[sw->type][j];
+                        set_bit(code, sw->dev[i].absbit);
+                        sw->dev[i].absmax[code] = (1 << bits) - 1;
+                        sw->dev[i].absmin[code] = (bits == 1) ? -1 : 0;
+                        sw->dev[i].absfuzz[code] = ((bits >> 1) >= 2) ? (1 << ((bits >> 1) - 2)) : 0;
+                        if (code != ABS_THROTTLE)
+                                sw->dev[i].absflat[code] = (bits >= 5) ? (1 << (bits - 5)) : 0;
+                }
+
+                for (j = 0; (code = sw_btn[sw->type][j]); j++)
+                        set_bit(code, sw->dev[i].keybit);
+
+                input_register_device(sw->dev + i);
+                printk(KERN_INFO "input: %s%s on %s [%d-bit id %d data %d]\n",
+                        sw->name, comment, gameport->phys, m, l, k);
+        }
+
+        return 0;
+
+fail2:  gameport_close(gameport);
+fail1:  gameport_set_drvdata(gameport, NULL);
+        kfree(sw);
+        kfree(buf);
+        kfree(idbuf);
+        return err;
+}
+
+static void sw_disconnect(struct gameport *gameport)
+{
+        struct sw *sw = gameport_get_drvdata(gameport);
+        int i;
+
+        for (i = 0; i < sw->number; i++)
+                input_unregister_device(sw->dev + i);
+        gameport_close(gameport);
+        gameport_set_drvdata(gameport, NULL);
+        kfree(sw);
+}
+
+static struct gameport_driver sw_drv = {
+        .driver         = {
+                .name   = "sidewinder",
+        },
+        .description    = DRIVER_DESC,
+        .connect        = sw_connect,
+        .disconnect     = sw_disconnect,
+};
+
+static int __init sw_init(void)
+{
+        gameport_register_driver(&sw_drv);
+        return 0;
+}
+
+static void __exit sw_exit(void)
+{
+        gameport_unregister_driver(&sw_drv);
+}
+
+module_init(sw_init);
+module_exit(sw_exit);