Source of hid-lg.c - linux-imx - PHYTEC BitBucket (Stash)

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#define LG_FF3          0x1000
#define LG_FF4          0x2000
​
/* Size of the original descriptors of the Driving Force (and Pro) wheels */
#define DF_RDESC_ORIG_SIZE  130
#define DFP_RDESC_ORIG_SIZE 97
#define FV_RDESC_ORIG_SIZE  130
#define MOMO_RDESC_ORIG_SIZE    87
#define MOMO2_RDESC_ORIG_SIZE   87
#define FFG_RDESC_ORIG_SIZE 85
#define FG_RDESC_ORIG_SIZE  82
​
/* Fixed report descriptors for Logitech Driving Force (and Pro)
 * wheel controllers
 *
 * The original descriptors hide the separate throttle and brake axes in
 * a custom vendor usage page, providing only a combined value as
 * GenericDesktop.Y.
 * These descriptors remove the combined Y axis and instead report
 * separate throttle (Y) and brake (RZ).
 */
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0x81, 0x02,         /*          Input (Variable),           */
0xC0,               /*      End Collection,                 */
0xA1, 0x02,         /*      Collection (Logical),           */
0x09, 0x02,         /*          Usage (02h),                */
0x95, 0x07,         /*          Report Count (7),           */
0x91, 0x02,         /*          Output (Variable),          */
0xC0,               /*      End Collection,                 */
0xC0                /*  End Collection                      */
};
​
static __u8 fg_rdesc_fixed[] = {
0x05, 0x01,         /*  Usage Page (Desktop),               */
0x09, 0x04,         /*  Usage (Joystik),                    */
0xA1, 0x01,         /*  Collection (Application),           */
0xA1, 0x02,         /*      Collection (Logical),           */
0x15, 0x00,         /*          Logical Minimum (0),        */
0x26, 0xFF, 0x00,   /*          Logical Maximum (255),      */
0x35, 0x00,         /*          Physical Minimum (0),       */
0x46, 0xFF, 0x00,   /*          Physical Maximum (255),     */
0x75, 0x08,         /*          Report Size (8),            */
0x95, 0x01,         /*          Report Count (1),           */
0x09, 0x30,         /*          Usage (X),                  */
0x81, 0x02,         /*          Input (Variable),           */
0xA4,               /*  Push,                               */
0x25, 0x01,         /*          Logical Maximum (1),        */
0x45, 0x01,         /*          Physical Maximum (1),       */
0x75, 0x01,         /*          Report Size (1),            */
0x95, 0x02,         /*          Report Count (2),           */
0x81, 0x01,         /*          Input (Constant),           */
0x95, 0x06,         /*          Report Count (6),           */
0x05, 0x09,         /*          Usage Page (Button),        */
0x19, 0x01,         /*          Usage Minimum (01h),        */
0x29, 0x06,         /*          Usage Maximum (06h),        */
0x81, 0x02,         /*          Input (Variable),           */
0x05, 0x01,         /*          Usage Page (Desktop),       */
0xB4,               /*  Pop,                                */
0x81, 0x02,         /*          Input (Constant),           */
0x09, 0x31,         /*          Usage (Y),                  */
0x81, 0x02,         /*          Input (Variable),           */
0x09, 0x32,         /*          Usage (Z),                  */
0x81, 0x02,         /*          Input (Variable),           */
0xC0,               /*      End Collection,                 */
0xA1, 0x02,         /*      Collection (Logical),           */
0x26, 0xFF, 0x00,   /*          Logical Maximum (255),      */
0x46, 0xFF, 0x00,   /*          Physical Maximum (255),     */
0x75, 0x08,         /*          Report Size (8),            */
0x95, 0x04,         /*          Report Count (4),           */
0x09, 0x02,         /*          Usage (02h),                */
0xB1, 0x02,         /*          Feature (Variable),         */
0xC0,               /*      End Collection,                 */
0xC0                /*  End Collection,                     */
};
​
/*
 * Certain Logitech keyboards send in report #3 keys which are far
 * above the logical maximum described in descriptor. This extends
 * the original value of 0x28c of logical maximum to 0x104d
 */
static __u8 *lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        unsigned int *rsize)
{
    struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
​
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    if ((drv_data->quirks & LG_RDESC_REL_ABS) && *rsize >= 51 &&
            rdesc[32] == 0x81 && rdesc[33] == 0x06 &&
            rdesc[49] == 0x81 && rdesc[50] == 0x06) {
        hid_info(hdev,
             "fixing up rel/abs in Logitech report descriptor\n");
        rdesc[33] = rdesc[50] = 0x02;
    }
​
    switch (hdev->product) {
​
    case USB_DEVICE_ID_LOGITECH_WINGMAN_FG:
        if (*rsize == FG_RDESC_ORIG_SIZE) {
            hid_info(hdev,
                "fixing up Logitech Wingman Formula GP report descriptor\n");
            rdesc = fg_rdesc_fixed;
            *rsize = sizeof(fg_rdesc_fixed);
        } else {
            hid_info(hdev,
                "rdesc size test failed for formula gp\n");
        }
        break;
​
​
    case USB_DEVICE_ID_LOGITECH_WINGMAN_FFG:
        if (*rsize == FFG_RDESC_ORIG_SIZE) {
            hid_info(hdev,
                "fixing up Logitech Wingman Formula Force GP report descriptor\n");
            rdesc = ffg_rdesc_fixed;
            *rsize = sizeof(ffg_rdesc_fixed);
        }
        break;
​
    /* Several wheels report as this id when operating in emulation mode. */
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    if ((drv_data->quirks & LG_DUPLICATE_USAGES) && (usage->type == EV_KEY ||
             usage->type == EV_REL || usage->type == EV_ABS))
        clear_bit(usage->code, *bit);
​
    /* Ensure that Logitech wheels are not given a default fuzz/flat value */
    if (usage->type == EV_ABS && (usage->code == ABS_X ||
            usage->code == ABS_Y || usage->code == ABS_Z ||
            usage->code == ABS_RZ)) {
        switch (hdev->product) {
        case USB_DEVICE_ID_LOGITECH_G29_WHEEL:
        case USB_DEVICE_ID_LOGITECH_WINGMAN_FG:
        case USB_DEVICE_ID_LOGITECH_WINGMAN_FFG:
        case USB_DEVICE_ID_LOGITECH_WHEEL:
        case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL:
        case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
        case USB_DEVICE_ID_LOGITECH_G25_WHEEL:
        case USB_DEVICE_ID_LOGITECH_DFGT_WHEEL:
        case USB_DEVICE_ID_LOGITECH_G27_WHEEL:
        case USB_DEVICE_ID_LOGITECH_WII_WHEEL:
        case USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2:
        case USB_DEVICE_ID_LOGITECH_VIBRATION_WHEEL:
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    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G25_WHEEL),
        .driver_data = LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_DFGT_WHEEL),
        .driver_data = LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G27_WHEEL),
        .driver_data = LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_DFP_WHEEL),
        .driver_data = LG_NOGET | LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WII_WHEEL),
        .driver_data = LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WINGMAN_FG),
        .driver_data = LG_NOGET },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WINGMAN_FFG),
        .driver_data = LG_NOGET | LG_FF4 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD2),
        .driver_data = LG_NOGET | LG_FF2 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_FLIGHT_SYSTEM_G940),
        .driver_data = LG_FF3 },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_SPACENAVIGATOR),
        .driver_data = LG_RDESC_REL_ABS },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_SPACETRAVELLER),
        .driver_data = LG_RDESC_REL_ABS },