/*
 *  HID driver for some sony "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2007 Paul Walmsley
 *  Copyright (c) 2008 Jiri Slaby
 *  Copyright (c) 2006-2008 Jiri Kosina
 */

/*
 * 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.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include "hid-ids.h"

#define VAIO_RDESC_CONSTANT     (1 << 0)
#define SIXAXIS_CONTROLLER_USB  (1 << 1)
#define SIXAXIS_CONTROLLER_BT   (1 << 2)

static const u8 sixaxis_rdesc_fixup[] = {
        0x95, 0x13, 0x09, 0x01, 0x81, 0x02, 0x95, 0x0C,
        0x81, 0x01, 0x75, 0x10, 0x95, 0x04, 0x26, 0xFF,
        0x03, 0x46, 0xFF, 0x03, 0x09, 0x01, 0x81, 0x02
};

struct sony_sc {
        unsigned long quirks;
};

/* Sony Vaio VGX has wrongly mouse pointer declared as constant */
static __u8 *sony_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        if ((sc->quirks & VAIO_RDESC_CONSTANT) &&
                        *rsize >= 56 && rdesc[54] == 0x81 && rdesc[55] == 0x07) {
                hid_info(hdev, "Fixing up Sony Vaio VGX report descriptor\n");
                rdesc[55] = 0x06;
        }

        /* The HID descriptor exposed over BT has a trailing zero byte */
        if ((((sc->quirks & SIXAXIS_CONTROLLER_USB) && *rsize == 148) ||
                        ((sc->quirks & SIXAXIS_CONTROLLER_BT) && *rsize == 149)) &&
                        rdesc[83] == 0x75) {
                hid_info(hdev, "Fixing up Sony Sixaxis report descriptor\n");
                memcpy((void *)&rdesc[83], (void *)&sixaxis_rdesc_fixup,
                        sizeof(sixaxis_rdesc_fixup));
        }
        return rdesc;
}

static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
                __u8 *rd, int size)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        /* Sixaxis HID report has acclerometers/gyro with MSByte first, this
         * has to be BYTE_SWAPPED before passing up to joystick interface
         */
        if ((sc->quirks & (SIXAXIS_CONTROLLER_USB | SIXAXIS_CONTROLLER_BT)) &&
                        rd[0] == 0x01 && size == 49) {
                swap(rd[41], rd[42]);
                swap(rd[43], rd[44]);
                swap(rd[45], rd[46]);
                swap(rd[47], rd[48]);
        }

        return 0;
}

/*
 * The Sony Sixaxis does not handle HID Output Reports on the Interrupt EP
 * like it should according to usbhid/hid-core.c::usbhid_output_raw_report()
 * so we need to override that forcing HID Output Reports on the Control EP.
 *
 * There is also another issue about HID Output Reports via USB, the Sixaxis
 * does not want the report_id as part of the data packet, so we have to
 * discard buf[0] when sending the actual control message, even for numbered
 * reports, humpf!
 */
static int sixaxis_usb_output_raw_report(struct hid_device *hid, __u8 *buf,
                size_t count, unsigned char report_type)
{
        struct usb_interface *intf = to_usb_interface(hid->dev.parent);
        struct usb_device *dev = interface_to_usbdev(intf);
        struct usb_host_interface *interface = intf->cur_altsetting;
        int report_id = buf[0];
        int ret;

        if (report_type == HID_OUTPUT_REPORT) {
                /* Don't send the Report ID */
                buf++;
                count--;
        }

        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                HID_REQ_SET_REPORT,
                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                ((report_type + 1) << 8) | report_id,
                interface->desc.bInterfaceNumber, buf, count,
                USB_CTRL_SET_TIMEOUT);

        /* Count also the Report ID, in case of an Output report. */
        if (ret > 0 && report_type == HID_OUTPUT_REPORT)
                ret++;

        return ret;
}

/*
 * Sending HID_REQ_GET_REPORT changes the operation mode of the ps3 controller
 * to "operational".  Without this, the ps3 controller will not report any
 * events.
 */
static int sixaxis_set_operational_usb(struct hid_device *hdev)
{
        struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
        struct usb_device *dev = interface_to_usbdev(intf);
        __u16 ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
        int ret;
        char *buf = kmalloc(18, GFP_KERNEL);

        if (!buf)
                return -ENOMEM;

        ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
                                 HID_REQ_GET_REPORT,
                                 USB_DIR_IN | USB_TYPE_CLASS |
                                 USB_RECIP_INTERFACE,
                                 (3 << 8) | 0xf2, ifnum, buf, 17,
                                 USB_CTRL_GET_TIMEOUT);
        if (ret < 0)
                hid_err(hdev, "can't set operational mode\n");

        kfree(buf);

        return ret;
}

static int sixaxis_set_operational_bt(struct hid_device *hdev)
{
        unsigned char buf[] = { 0xf4,  0x42, 0x03, 0x00, 0x00 };
        return hdev->hid_output_raw_report(hdev, buf, sizeof(buf), HID_FEATURE_REPORT);
}

static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
        int ret;
        unsigned long quirks = id->driver_data;
        struct sony_sc *sc;

        sc = kzalloc(sizeof(*sc), GFP_KERNEL);
        if (sc == NULL) {
                hid_err(hdev, "can't alloc sony descriptor\n");
                return -ENOMEM;
        }

        sc->quirks = quirks;
        hid_set_drvdata(hdev, sc);

        ret = hid_parse(hdev);
        if (ret) {
                hid_err(hdev, "parse failed\n");
                goto err_free;
        }

        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT |
                        HID_CONNECT_HIDDEV_FORCE);
        if (ret) {
                hid_err(hdev, "hw start failed\n");
                goto err_free;
        }

        if (sc->quirks & SIXAXIS_CONTROLLER_USB) {
                hdev->hid_output_raw_report = sixaxis_usb_output_raw_report;
                ret = sixaxis_set_operational_usb(hdev);
        }
        else if (sc->quirks & SIXAXIS_CONTROLLER_BT)
                ret = sixaxis_set_operational_bt(hdev);
        else
                ret = 0;

        if (ret < 0)
                goto err_stop;

        return 0;
err_stop:
        hid_hw_stop(hdev);
err_free:
        kfree(sc);
        return ret;
}

static void sony_remove(struct hid_device *hdev)
{
        hid_hw_stop(hdev);
        kfree(hid_get_drvdata(hdev));
}

static const struct hid_device_id sony_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER),
                .driver_data = SIXAXIS_CONTROLLER_USB },
        { HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_NAVIGATION_CONTROLLER),
                .driver_data = SIXAXIS_CONTROLLER_USB },
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER),
                .driver_data = SIXAXIS_CONTROLLER_BT },
        { HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_VAIO_VGX_MOUSE),
                .driver_data = VAIO_RDESC_CONSTANT },
        { }
};
MODULE_DEVICE_TABLE(hid, sony_devices);

static struct hid_driver sony_driver = {
        .name = "sony",
        .id_table = sony_devices,
        .probe = sony_probe,
        .remove = sony_remove,
        .report_fixup = sony_report_fixup,
        .raw_event = sony_raw_event
};

static int __init sony_init(void)
{
        return hid_register_driver(&sony_driver);
}

static void __exit sony_exit(void)
{
        hid_unregister_driver(&sony_driver);
}

module_init(sony_init);
module_exit(sony_exit);
MODULE_LICENSE("GPL");