/*
 *  USB ATI Remote support
 *
 *  Version 2.2.0 Copyright (c) 2004 Torrey Hoffman <thoffman@arnor.net>
 *  Version 2.1.1 Copyright (c) 2002 Vladimir Dergachev
 *
 *  This 2.2.0 version is a rewrite / cleanup of the 2.1.1 driver, including
 *  porting to the 2.6 kernel interfaces, along with other modification
 *  to better match the style of the existing usb/input drivers.  However, the
 *  protocol and hardware handling is essentially unchanged from 2.1.1.
 *
 *  The 2.1.1 driver was derived from the usbati_remote and usbkbd drivers by
 *  Vojtech Pavlik.
 *
 *  Changes:
 *
 *  Feb 2004: Torrey Hoffman <thoffman@arnor.net>
 *            Version 2.2.0
 *  Jun 2004: Torrey Hoffman <thoffman@arnor.net>
 *            Version 2.2.1
 *            Added key repeat support contributed by:
 *                Vincent Vanackere <vanackere@lif.univ-mrs.fr>
 *            Added support for the "Lola" remote contributed by:
 *                Seth Cohn <sethcohn@yahoo.com>
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 * 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
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 * Hardware & software notes
 *
 * These remote controls are distributed by ATI as part of their
 * "All-In-Wonder" video card packages.  The receiver self-identifies as a
 * "USB Receiver" with manufacturer "X10 Wireless Technology Inc".
 *
 * The "Lola" remote is available from X10.  See:
 *    http://www.x10.com/products/lola_sg1.htm
 * The Lola is similar to the ATI remote but has no mouse support, and slightly
 * different keys.
 *
 * It is possible to use multiple receivers and remotes on multiple computers
 * simultaneously by configuring them to use specific channels.
 *
 * The RF protocol used by the remote supports 16 distinct channels, 1 to 16.
 * Actually, it may even support more, at least in some revisions of the
 * hardware.
 *
 * Each remote can be configured to transmit on one channel as follows:
 *   - Press and hold the "hand icon" button.
 *   - When the red LED starts to blink, let go of the "hand icon" button.
 *   - When it stops blinking, input the channel code as two digits, from 01
 *     to 16, and press the hand icon again.
 *
 * The timing can be a little tricky.  Try loading the module with debug=1
 * to have the kernel print out messages about the remote control number
 * and mask.  Note: debugging prints remote numbers as zero-based hexadecimal.
 *
 * The driver has a "channel_mask" parameter. This bitmask specifies which
 * channels will be ignored by the module.  To mask out channels, just add
 * all the 2^channel_number values together.
 *
 * For instance, set channel_mask = 2^4 = 16 (binary 10000) to make ati_remote
 * ignore signals coming from remote controls transmitting on channel 4, but
 * accept all other channels.
 *
 * Or, set channel_mask = 65533, (0xFFFD), and all channels except 1 will be
 * ignored.
 *
 * The default is 0 (respond to all channels). Bit 0 and bits 17-32 of this
 * parameter are unused.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb/input.h>
#include <linux/wait.h>
#include <linux/jiffies.h>

/*
 * Module and Version Information, Module Parameters
 */

#define ATI_REMOTE_VENDOR_ID    0x0bc7
#define ATI_REMOTE_PRODUCT_ID   0x004
#define LOLA_REMOTE_PRODUCT_ID  0x002
#define MEDION_REMOTE_PRODUCT_ID 0x006

#define DRIVER_VERSION          "2.2.1"
#define DRIVER_AUTHOR           "Torrey Hoffman <thoffman@arnor.net>"
#define DRIVER_DESC             "ATI/X10 RF USB Remote Control"

#define NAME_BUFSIZE      80    /* size of product name, path buffers */
#define DATA_BUFSIZE      63    /* size of URB data buffers */

/*
 * Duplicate event filtering time.
 * Sequential, identical KIND_FILTERED inputs with less than
 * FILTER_TIME milliseconds between them are considered as repeat
 * events. The hardware generates 5 events for the first keypress
 * and we have to take this into account for an accurate repeat
 * behaviour.
 */
#define FILTER_TIME     60 /* msec */
#define REPEAT_DELAY    500 /* msec */

static unsigned long channel_mask;
module_param(channel_mask, ulong, 0644);
MODULE_PARM_DESC(channel_mask, "Bitmask of remote control channels to ignore");

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable extra debug messages and information");

static int repeat_filter = FILTER_TIME;
module_param(repeat_filter, int, 0644);
MODULE_PARM_DESC(repeat_filter, "Repeat filter time, default = 60 msec");

static int repeat_delay = REPEAT_DELAY;
module_param(repeat_delay, int, 0644);
MODULE_PARM_DESC(repeat_delay, "Delay before sending repeats, default = 500 msec");

#define dbginfo(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
#undef err
#define err(format, arg...) printk(KERN_ERR format , ## arg)

static struct usb_device_id ati_remote_table[] = {
        { USB_DEVICE(ATI_REMOTE_VENDOR_ID, ATI_REMOTE_PRODUCT_ID) },
        { USB_DEVICE(ATI_REMOTE_VENDOR_ID, LOLA_REMOTE_PRODUCT_ID) },
        { USB_DEVICE(ATI_REMOTE_VENDOR_ID, MEDION_REMOTE_PRODUCT_ID) },
        {}      /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, ati_remote_table);

/* Get hi and low bytes of a 16-bits int */
#define HI(a)   ((unsigned char)((a) >> 8))
#define LO(a)   ((unsigned char)((a) & 0xff))

#define SEND_FLAG_IN_PROGRESS   1
#define SEND_FLAG_COMPLETE      2

/* Device initialization strings */
static char init1[] = { 0x01, 0x00, 0x20, 0x14 };
static char init2[] = { 0x01, 0x00, 0x20, 0x14, 0x20, 0x20, 0x20 };

struct ati_remote {
        struct input_dev *idev;
        struct usb_device *udev;
        struct usb_interface *interface;

        struct urb *irq_urb;
        struct urb *out_urb;
        struct usb_endpoint_descriptor *endpoint_in;
        struct usb_endpoint_descriptor *endpoint_out;
        unsigned char *inbuf;
        unsigned char *outbuf;
        dma_addr_t inbuf_dma;
        dma_addr_t outbuf_dma;

        unsigned char old_data[2];  /* Detect duplicate events */
        unsigned long old_jiffies;
        unsigned long acc_jiffies;  /* handle acceleration */
        unsigned long first_jiffies;

        unsigned int repeat_count;

        char name[NAME_BUFSIZE];
        char phys[NAME_BUFSIZE];

        wait_queue_head_t wait;
        int send_flags;
};

/* "Kinds" of messages sent from the hardware to the driver. */
#define KIND_END        0
#define KIND_LITERAL    1   /* Simply pass to input system */
#define KIND_FILTERED   2   /* Add artificial key-up events, drop keyrepeats */
#define KIND_LU         3   /* Directional keypad diagonals - left up, */
#define KIND_RU         4   /*   right up,  */
#define KIND_LD         5   /*   left down, */
#define KIND_RD         6   /*   right down */
#define KIND_ACCEL      7   /* Directional keypad - left, right, up, down.*/

/* Translation table from hardware messages to input events. */
static const struct {
        short kind;
        unsigned char data1, data2;
        int type;
        unsigned int code;
        int value;
}  ati_remote_tbl[] = {
        /* Directional control pad axes */
        {KIND_ACCEL,   0x35, 0x70, EV_REL, REL_X, -1},   /* left */
        {KIND_ACCEL,   0x36, 0x71, EV_REL, REL_X, 1},    /* right */
        {KIND_ACCEL,   0x37, 0x72, EV_REL, REL_Y, -1},   /* up */
        {KIND_ACCEL,   0x38, 0x73, EV_REL, REL_Y, 1},    /* down */
        /* Directional control pad diagonals */
        {KIND_LU,      0x39, 0x74, EV_REL, 0, 0},        /* left up */
        {KIND_RU,      0x3a, 0x75, EV_REL, 0, 0},        /* right up */
        {KIND_LD,      0x3c, 0x77, EV_REL, 0, 0},        /* left down */
        {KIND_RD,      0x3b, 0x76, EV_REL, 0, 0},        /* right down */

        /* "Mouse button" buttons */
        {KIND_LITERAL, 0x3d, 0x78, EV_KEY, BTN_LEFT, 1}, /* left btn down */
        {KIND_LITERAL, 0x3e, 0x79, EV_KEY, BTN_LEFT, 0}, /* left btn up */
        {KIND_LITERAL, 0x41, 0x7c, EV_KEY, BTN_RIGHT, 1},/* right btn down */
        {KIND_LITERAL, 0x42, 0x7d, EV_KEY, BTN_RIGHT, 0},/* right btn up */

        /* Artificial "doubleclick" events are generated by the hardware.
         * They are mapped to the "side" and "extra" mouse buttons here. */
        {KIND_FILTERED, 0x3f, 0x7a, EV_KEY, BTN_SIDE, 1}, /* left dblclick */
        {KIND_FILTERED, 0x43, 0x7e, EV_KEY, BTN_EXTRA, 1},/* right dblclick */

        /* keyboard. */
        {KIND_FILTERED, 0xd2, 0x0d, EV_KEY, KEY_1, 1},
        {KIND_FILTERED, 0xd3, 0x0e, EV_KEY, KEY_2, 1},
        {KIND_FILTERED, 0xd4, 0x0f, EV_KEY, KEY_3, 1},
        {KIND_FILTERED, 0xd5, 0x10, EV_KEY, KEY_4, 1},
        {KIND_FILTERED, 0xd6, 0x11, EV_KEY, KEY_5, 1},
        {KIND_FILTERED, 0xd7, 0x12, EV_KEY, KEY_6, 1},
        {KIND_FILTERED, 0xd8, 0x13, EV_KEY, KEY_7, 1},
        {KIND_FILTERED, 0xd9, 0x14, EV_KEY, KEY_8, 1},
        {KIND_FILTERED, 0xda, 0x15, EV_KEY, KEY_9, 1},
        {KIND_FILTERED, 0xdc, 0x17, EV_KEY, KEY_0, 1},
        {KIND_FILTERED, 0xc5, 0x00, EV_KEY, KEY_A, 1},
        {KIND_FILTERED, 0xc6, 0x01, EV_KEY, KEY_B, 1},
        {KIND_FILTERED, 0xde, 0x19, EV_KEY, KEY_C, 1},
        {KIND_FILTERED, 0xe0, 0x1b, EV_KEY, KEY_D, 1},
        {KIND_FILTERED, 0xe6, 0x21, EV_KEY, KEY_E, 1},
        {KIND_FILTERED, 0xe8, 0x23, EV_KEY, KEY_F, 1},

        /* "special" keys */
        {KIND_FILTERED, 0xdd, 0x18, EV_KEY, KEY_KPENTER, 1},    /* "check" */
        {KIND_FILTERED, 0xdb, 0x16, EV_KEY, KEY_MENU, 1},       /* "menu" */
        {KIND_FILTERED, 0xc7, 0x02, EV_KEY, KEY_POWER, 1},      /* Power */
        {KIND_FILTERED, 0xc8, 0x03, EV_KEY, KEY_TV, 1},         /* TV */
        {KIND_FILTERED, 0xc9, 0x04, EV_KEY, KEY_DVD, 1},        /* DVD */
        {KIND_FILTERED, 0xca, 0x05, EV_KEY, KEY_WWW, 1},        /* WEB */
        {KIND_FILTERED, 0xcb, 0x06, EV_KEY, KEY_BOOKMARKS, 1},  /* "book" */
        {KIND_FILTERED, 0xcc, 0x07, EV_KEY, KEY_EDIT, 1},       /* "hand" */
        {KIND_FILTERED, 0xe1, 0x1c, EV_KEY, KEY_COFFEE, 1},     /* "timer" */
        {KIND_FILTERED, 0xe5, 0x20, EV_KEY, KEY_FRONT, 1},      /* "max" */
        {KIND_FILTERED, 0xe2, 0x1d, EV_KEY, KEY_LEFT, 1},       /* left */
        {KIND_FILTERED, 0xe4, 0x1f, EV_KEY, KEY_RIGHT, 1},      /* right */
        {KIND_FILTERED, 0xe7, 0x22, EV_KEY, KEY_DOWN, 1},       /* down */
        {KIND_FILTERED, 0xdf, 0x1a, EV_KEY, KEY_UP, 1},         /* up */
        {KIND_FILTERED, 0xe3, 0x1e, EV_KEY, KEY_OK, 1},         /* "OK" */
        {KIND_FILTERED, 0xce, 0x09, EV_KEY, KEY_VOLUMEDOWN, 1}, /* VOL + */
        {KIND_FILTERED, 0xcd, 0x08, EV_KEY, KEY_VOLUMEUP, 1},   /* VOL - */
        {KIND_FILTERED, 0xcf, 0x0a, EV_KEY, KEY_MUTE, 1},       /* MUTE  */
        {KIND_FILTERED, 0xd0, 0x0b, EV_KEY, KEY_CHANNELUP, 1},  /* CH + */
        {KIND_FILTERED, 0xd1, 0x0c, EV_KEY, KEY_CHANNELDOWN, 1},/* CH - */
        {KIND_FILTERED, 0xec, 0x27, EV_KEY, KEY_RECORD, 1},     /* ( o) red */
        {KIND_FILTERED, 0xea, 0x25, EV_KEY, KEY_PLAY, 1},       /* ( >) */
        {KIND_FILTERED, 0xe9, 0x24, EV_KEY, KEY_REWIND, 1},     /* (<<) */
        {KIND_FILTERED, 0xeb, 0x26, EV_KEY, KEY_FORWARD, 1},    /* (>>) */
        {KIND_FILTERED, 0xed, 0x28, EV_KEY, KEY_STOP, 1},       /* ([]) */
        {KIND_FILTERED, 0xee, 0x29, EV_KEY, KEY_PAUSE, 1},      /* ('') */
        {KIND_FILTERED, 0xf0, 0x2b, EV_KEY, KEY_PREVIOUS, 1},   /* (<-) */
        {KIND_FILTERED, 0xef, 0x2a, EV_KEY, KEY_NEXT, 1},       /* (>+) */
        {KIND_FILTERED, 0xf2, 0x2D, EV_KEY, KEY_INFO, 1},       /* PLAYING */
        {KIND_FILTERED, 0xf3, 0x2E, EV_KEY, KEY_HOME, 1},       /* TOP */
        {KIND_FILTERED, 0xf4, 0x2F, EV_KEY, KEY_END, 1},        /* END */
        {KIND_FILTERED, 0xf5, 0x30, EV_KEY, KEY_SELECT, 1},     /* SELECT */

        {KIND_END, 0x00, 0x00, EV_MAX + 1, 0, 0}
};

/* Local function prototypes */
static int ati_remote_open              (struct input_dev *inputdev);
static void ati_remote_close            (struct input_dev *inputdev);
static int ati_remote_sendpacket        (struct ati_remote *ati_remote, u16 cmd, unsigned char *data);
static void ati_remote_irq_out          (struct urb *urb);
static void ati_remote_irq_in           (struct urb *urb);
static void ati_remote_input_report     (struct urb *urb);
static int ati_remote_initialize        (struct ati_remote *ati_remote);
static int ati_remote_probe             (struct usb_interface *interface, const struct usb_device_id *id);
static void ati_remote_disconnect       (struct usb_interface *interface);

/* usb specific object to register with the usb subsystem */
static struct usb_driver ati_remote_driver = {
        .name         = "ati_remote",
        .probe        = ati_remote_probe,
        .disconnect   = ati_remote_disconnect,
        .id_table     = ati_remote_table,
};

/*
 *      ati_remote_dump_input
 */
static void ati_remote_dump(struct device *dev, unsigned char *data,
                            unsigned int len)
{
        if ((len == 1) && (data[0] != (unsigned char)0xff) && (data[0] != 0x00))
                dev_warn(dev, "Weird byte 0x%02x\n", data[0]);
        else if (len == 4)
                dev_warn(dev, "Weird key %02x %02x %02x %02x\n",
                     data[0], data[1], data[2], data[3]);
        else
                dev_warn(dev, "Weird data, len=%d %02x %02x %02x %02x %02x %02x ...\n",
                     len, data[0], data[1], data[2], data[3], data[4], data[5]);
}

/*
 *      ati_remote_open
 */
static int ati_remote_open(struct input_dev *inputdev)
{
        struct ati_remote *ati_remote = input_get_drvdata(inputdev);

        /* On first open, submit the read urb which was set up previously. */
        ati_remote->irq_urb->dev = ati_remote->udev;
        if (usb_submit_urb(ati_remote->irq_urb, GFP_KERNEL)) {
                dev_err(&ati_remote->interface->dev,
                        "%s: usb_submit_urb failed!\n", __func__);
                return -EIO;
        }

        return 0;
}

/*
 *      ati_remote_close
 */
static void ati_remote_close(struct input_dev *inputdev)
{
        struct ati_remote *ati_remote = input_get_drvdata(inputdev);

        usb_kill_urb(ati_remote->irq_urb);
}

/*
 *              ati_remote_irq_out
 */
static void ati_remote_irq_out(struct urb *urb)
{
        struct ati_remote *ati_remote = urb->context;

        if (urb->status) {
                dev_dbg(&ati_remote->interface->dev, "%s: status %d\n",
                        __func__, urb->status);
                return;
        }

        ati_remote->send_flags |= SEND_FLAG_COMPLETE;
        wmb();
        wake_up(&ati_remote->wait);
}

/*
 *      ati_remote_sendpacket
 *
 *      Used to send device initialization strings
 */
static int ati_remote_sendpacket(struct ati_remote *ati_remote, u16 cmd, unsigned char *data)
{
        int retval = 0;

        /* Set up out_urb */
        memcpy(ati_remote->out_urb->transfer_buffer + 1, data, LO(cmd));
        ((char *) ati_remote->out_urb->transfer_buffer)[0] = HI(cmd);

        ati_remote->out_urb->transfer_buffer_length = LO(cmd) + 1;
        ati_remote->out_urb->dev = ati_remote->udev;
        ati_remote->send_flags = SEND_FLAG_IN_PROGRESS;

        retval = usb_submit_urb(ati_remote->out_urb, GFP_ATOMIC);
        if (retval) {
                dev_dbg(&ati_remote->interface->dev,
                         "sendpacket: usb_submit_urb failed: %d\n", retval);
                return retval;
        }

        wait_event_timeout(ati_remote->wait,
                ((ati_remote->out_urb->status != -EINPROGRESS) ||
                        (ati_remote->send_flags & SEND_FLAG_COMPLETE)),
                HZ);
        usb_kill_urb(ati_remote->out_urb);

        return retval;
}

/*
 *      ati_remote_event_lookup
 */
static int ati_remote_event_lookup(int rem, unsigned char d1, unsigned char d2)
{
        int i;

        for (i = 0; ati_remote_tbl[i].kind != KIND_END; i++) {
                /*
                 * Decide if the table entry matches the remote input.
                 */
                if ((((ati_remote_tbl[i].data1 & 0x0f) == (d1 & 0x0f))) &&
                    ((((ati_remote_tbl[i].data1 >> 4) -
                       (d1 >> 4) + rem) & 0x0f) == 0x0f) &&
                    (ati_remote_tbl[i].data2 == d2))
                        return i;

        }
        return -1;
}

/*
 *      ati_remote_compute_accel
 *
 * Implements acceleration curve for directional control pad
 * If elapsed time since last event is > 1/4 second, user "stopped",
 * so reset acceleration. Otherwise, user is probably holding the control
 * pad down, so we increase acceleration, ramping up over two seconds to
 * a maximum speed.
 */
static int ati_remote_compute_accel(struct ati_remote *ati_remote)
{
        static const char accel[] = { 1, 2, 4, 6, 9, 13, 20 };
        unsigned long now = jiffies;
        int acc;

        if (time_after(now, ati_remote->old_jiffies + msecs_to_jiffies(250))) {
                acc = 1;
                ati_remote->acc_jiffies = now;
        }
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(125)))
                acc = accel[0];
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(250)))
                acc = accel[1];
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(500)))
                acc = accel[2];
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(1000)))
                acc = accel[3];
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(1500)))
                acc = accel[4];
        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(2000)))
                acc = accel[5];
        else
                acc = accel[6];

        return acc;
}

/*
 *      ati_remote_report_input
 */
static void ati_remote_input_report(struct urb *urb)
{
        struct ati_remote *ati_remote = urb->context;
        unsigned char *data= ati_remote->inbuf;
        struct input_dev *dev = ati_remote->idev;
        int index, acc;
        int remote_num;

        /* Deal with strange looking inputs */
        if ( (urb->actual_length != 4) || (data[0] != 0x14) ||
                ((data[3] & 0x0f) != 0x00) ) {
                ati_remote_dump(&urb->dev->dev, data, urb->actual_length);
                return;
        }

        /* Mask unwanted remote channels.  */
        /* note: remote_num is 0-based, channel 1 on remote == 0 here */
        remote_num = (data[3] >> 4) & 0x0f;
        if (channel_mask & (1 << (remote_num + 1))) {
                dbginfo(&ati_remote->interface->dev,
                        "Masked input from channel 0x%02x: data %02x,%02x, mask= 0x%02lx\n",
                        remote_num, data[1], data[2], channel_mask);
                return;
        }

        /* Look up event code index in translation table */
        index = ati_remote_event_lookup(remote_num, data[1], data[2]);
        if (index < 0) {
                dev_warn(&ati_remote->interface->dev,
                         "Unknown input from channel 0x%02x: data %02x,%02x\n",
                         remote_num, data[1], data[2]);
                return;
        }
        dbginfo(&ati_remote->interface->dev,
                "channel 0x%02x; data %02x,%02x; index %d; keycode %d\n",
                remote_num, data[1], data[2], index, ati_remote_tbl[index].code);

        if (ati_remote_tbl[index].kind == KIND_LITERAL) {
                input_event(dev, ati_remote_tbl[index].type,
                        ati_remote_tbl[index].code,
                        ati_remote_tbl[index].value);
                input_sync(dev);

                ati_remote->old_jiffies = jiffies;
                return;
        }

        if (ati_remote_tbl[index].kind == KIND_FILTERED) {
                unsigned long now = jiffies;

                /* Filter duplicate events which happen "too close" together. */
                if (ati_remote->old_data[0] == data[1] &&
                    ati_remote->old_data[1] == data[2] &&
                    time_before(now, ati_remote->old_jiffies +
                                     msecs_to_jiffies(repeat_filter))) {
                        ati_remote->repeat_count++;
                } else {
                        ati_remote->repeat_count = 0;
                        ati_remote->first_jiffies = now;
                }

                ati_remote->old_data[0] = data[1];
                ati_remote->old_data[1] = data[2];
                ati_remote->old_jiffies = now;

                /* Ensure we skip at least the 4 first duplicate events (generated
                 * by a single keypress), and continue skipping until repeat_delay
                 * msecs have passed
                 */
                if (ati_remote->repeat_count > 0 &&
                    (ati_remote->repeat_count < 5 ||
                     time_before(now, ati_remote->first_jiffies +
                                      msecs_to_jiffies(repeat_delay))))
                        return;


                input_event(dev, ati_remote_tbl[index].type,
                        ati_remote_tbl[index].code, 1);
                input_sync(dev);
                input_event(dev, ati_remote_tbl[index].type,
                        ati_remote_tbl[index].code, 0);
                input_sync(dev);

        } else {

                /*
                 * Other event kinds are from the directional control pad, and have an
                 * acceleration factor applied to them.  Without this acceleration, the
                 * control pad is mostly unusable.
                 */
                acc = ati_remote_compute_accel(ati_remote);

                switch (ati_remote_tbl[index].kind) {
                case KIND_ACCEL:
                        input_event(dev, ati_remote_tbl[index].type,
                                ati_remote_tbl[index].code,
                                ati_remote_tbl[index].value * acc);
                        break;
                case KIND_LU:
                        input_report_rel(dev, REL_X, -acc);
                        input_report_rel(dev, REL_Y, -acc);
                        break;
                case KIND_RU:
                        input_report_rel(dev, REL_X, acc);
                        input_report_rel(dev, REL_Y, -acc);
                        break;
                case KIND_LD:
                        input_report_rel(dev, REL_X, -acc);
                        input_report_rel(dev, REL_Y, acc);
                        break;
                case KIND_RD:
                        input_report_rel(dev, REL_X, acc);
                        input_report_rel(dev, REL_Y, acc);
                        break;
                default:
                        dev_dbg(&ati_remote->interface->dev, "ati_remote kind=%d\n",
                                ati_remote_tbl[index].kind);
                }
                input_sync(dev);

                ati_remote->old_jiffies = jiffies;
                ati_remote->old_data[0] = data[1];
                ati_remote->old_data[1] = data[2];
        }
}

/*
 *      ati_remote_irq_in
 */
static void ati_remote_irq_in(struct urb *urb)
{
        struct ati_remote *ati_remote = urb->context;
        int retval;

        switch (urb->status) {
        case 0:                 /* success */
                ati_remote_input_report(urb);
                break;
        case -ECONNRESET:       /* unlink */
        case -ENOENT:
        case -ESHUTDOWN:
                dev_dbg(&ati_remote->interface->dev, "%s: urb error status, unlink? \n",
                        __func__);
                return;
        default:                /* error */
                dev_dbg(&ati_remote->interface->dev, "%s: Nonzero urb status %d\n",
                        __func__, urb->status);
        }

        retval = usb_submit_urb(urb, GFP_ATOMIC);
        if (retval)
                dev_err(&ati_remote->interface->dev, "%s: usb_submit_urb()=%d\n",
                        __func__, retval);
}

/*
 *      ati_remote_alloc_buffers
 */
static int ati_remote_alloc_buffers(struct usb_device *udev,
                                    struct ati_remote *ati_remote)
{
        ati_remote->inbuf = usb_buffer_alloc(udev, DATA_BUFSIZE, GFP_ATOMIC,
                                             &ati_remote->inbuf_dma);
        if (!ati_remote->inbuf)
                return -1;

        ati_remote->outbuf = usb_buffer_alloc(udev, DATA_BUFSIZE, GFP_ATOMIC,
                                              &ati_remote->outbuf_dma);
        if (!ati_remote->outbuf)
                return -1;

        ati_remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!ati_remote->irq_urb)
                return -1;

        ati_remote->out_urb = usb_alloc_urb(0, GFP_KERNEL);
        if (!ati_remote->out_urb)
                return -1;

        return 0;
}

/*
 *      ati_remote_free_buffers
 */
static void ati_remote_free_buffers(struct ati_remote *ati_remote)
{
        usb_free_urb(ati_remote->irq_urb);
        usb_free_urb(ati_remote->out_urb);

        usb_buffer_free(ati_remote->udev, DATA_BUFSIZE,
                ati_remote->inbuf, ati_remote->inbuf_dma);

        usb_buffer_free(ati_remote->udev, DATA_BUFSIZE,
                ati_remote->outbuf, ati_remote->outbuf_dma);
}

static void ati_remote_input_init(struct ati_remote *ati_remote)
{
        struct input_dev *idev = ati_remote->idev;
        int i;

        idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
        idev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
                BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_SIDE) | BIT_MASK(BTN_EXTRA);
        idev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
        for (i = 0; ati_remote_tbl[i].kind != KIND_END; i++)
                if (ati_remote_tbl[i].type == EV_KEY)
                        set_bit(ati_remote_tbl[i].code, idev->keybit);

        input_set_drvdata(idev, ati_remote);

        idev->open = ati_remote_open;
        idev->close = ati_remote_close;

        idev->name = ati_remote->name;
        idev->phys = ati_remote->phys;

        usb_to_input_id(ati_remote->udev, &idev->id);
        idev->dev.parent = &ati_remote->udev->dev;
}

static int ati_remote_initialize(struct ati_remote *ati_remote)
{
        struct usb_device *udev = ati_remote->udev;
        int pipe, maxp;

        init_waitqueue_head(&ati_remote->wait);

        /* Set up irq_urb */
        pipe = usb_rcvintpipe(udev, ati_remote->endpoint_in->bEndpointAddress);
        maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
        maxp = (maxp > DATA_BUFSIZE) ? DATA_BUFSIZE : maxp;

        usb_fill_int_urb(ati_remote->irq_urb, udev, pipe, ati_remote->inbuf,
                         maxp, ati_remote_irq_in, ati_remote,
                         ati_remote->endpoint_in->bInterval);
        ati_remote->irq_urb->transfer_dma = ati_remote->inbuf_dma;
        ati_remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        /* Set up out_urb */
        pipe = usb_sndintpipe(udev, ati_remote->endpoint_out->bEndpointAddress);
        maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
        maxp = (maxp > DATA_BUFSIZE) ? DATA_BUFSIZE : maxp;

        usb_fill_int_urb(ati_remote->out_urb, udev, pipe, ati_remote->outbuf,
                         maxp, ati_remote_irq_out, ati_remote,
                         ati_remote->endpoint_out->bInterval);
        ati_remote->out_urb->transfer_dma = ati_remote->outbuf_dma;
        ati_remote->out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        /* send initialization strings */
        if ((ati_remote_sendpacket(ati_remote, 0x8004, init1)) ||
            (ati_remote_sendpacket(ati_remote, 0x8007, init2))) {
                dev_err(&ati_remote->interface->dev,
                         "Initializing ati_remote hardware failed.\n");
                return -EIO;
        }

        return 0;
}

/*
 *      ati_remote_probe
 */
static int ati_remote_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
        struct usb_device *udev = interface_to_usbdev(interface);
        struct usb_host_interface *iface_host = interface->cur_altsetting;
        struct usb_endpoint_descriptor *endpoint_in, *endpoint_out;
        struct ati_remote *ati_remote;
        struct input_dev *input_dev;
        int err = -ENOMEM;

        if (iface_host->desc.bNumEndpoints != 2) {
                err("%s: Unexpected desc.bNumEndpoints\n", __func__);
                return -ENODEV;
        }

        endpoint_in = &iface_host->endpoint[0].desc;
        endpoint_out = &iface_host->endpoint[1].desc;

        if (!usb_endpoint_is_int_in(endpoint_in)) {
                err("%s: Unexpected endpoint_in\n", __func__);
                return -ENODEV;
        }
        if (le16_to_cpu(endpoint_in->wMaxPacketSize) == 0) {
                err("%s: endpoint_in message size==0? \n", __func__);
                return -ENODEV;
        }

        ati_remote = kzalloc(sizeof (struct ati_remote), GFP_KERNEL);
        input_dev = input_allocate_device();
        if (!ati_remote || !input_dev)
                goto fail1;

        /* Allocate URB buffers, URBs */
        if (ati_remote_alloc_buffers(udev, ati_remote))
                goto fail2;

        ati_remote->endpoint_in = endpoint_in;
        ati_remote->endpoint_out = endpoint_out;
        ati_remote->udev = udev;
        ati_remote->idev = input_dev;
        ati_remote->interface = interface;

        usb_make_path(udev, ati_remote->phys, sizeof(ati_remote->phys));
        strlcpy(ati_remote->phys, "/input0", sizeof(ati_remote->phys));

        if (udev->manufacturer)
                strlcpy(ati_remote->name, udev->manufacturer, sizeof(ati_remote->name));

        if (udev->product)
                snprintf(ati_remote->name, sizeof(ati_remote->name),
                         "%s %s", ati_remote->name, udev->product);

        if (!strlen(ati_remote->name))
                snprintf(ati_remote->name, sizeof(ati_remote->name),
                        DRIVER_DESC "(%04x,%04x)",
                        le16_to_cpu(ati_remote->udev->descriptor.idVendor),
                        le16_to_cpu(ati_remote->udev->descriptor.idProduct));

        ati_remote_input_init(ati_remote);

        /* Device Hardware Initialization - fills in ati_remote->idev from udev. */
        err = ati_remote_initialize(ati_remote);
        if (err)
                goto fail3;

        /* Set up and register input device */
        err = input_register_device(ati_remote->idev);
        if (err)
                goto fail3;

        usb_set_intfdata(interface, ati_remote);
        return 0;

 fail3: usb_kill_urb(ati_remote->irq_urb);
        usb_kill_urb(ati_remote->out_urb);
 fail2: ati_remote_free_buffers(ati_remote);
 fail1: input_free_device(input_dev);
        kfree(ati_remote);
        return err;
}

/*
 *      ati_remote_disconnect
 */
static void ati_remote_disconnect(struct usb_interface *interface)
{
        struct ati_remote *ati_remote;

        ati_remote = usb_get_intfdata(interface);
        usb_set_intfdata(interface, NULL);
        if (!ati_remote) {
                dev_warn(&interface->dev, "%s - null device?\n", __func__);
                return;
        }

        usb_kill_urb(ati_remote->irq_urb);
        usb_kill_urb(ati_remote->out_urb);
        input_unregister_device(ati_remote->idev);
        ati_remote_free_buffers(ati_remote);
        kfree(ati_remote);
}

/*
 *      ati_remote_init
 */
static int __init ati_remote_init(void)
{
        int result;

        result = usb_register(&ati_remote_driver);
        if (result)
                printk(KERN_ERR KBUILD_MODNAME
                       ": usb_register error #%d\n", result);
        else
                printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
                       DRIVER_DESC "\n");

        return result;
}

/*
 *      ati_remote_exit
 */
static void __exit ati_remote_exit(void)
{
        usb_deregister(&ati_remote_driver);
}

/*
 *      module specification
 */

module_init(ati_remote_init);
module_exit(ati_remote_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");