File: libusbhid.cpp

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/*
 * vim:tw=80:ai:tabstop=4:softtabstop=4:shiftwidth=4:expandtab
 *
 * 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 3 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * (C) Copyright Kevin Timmerman 2007
 * (C) Copyright Phil Dibowitz 2007
 */

#include "lc_internal.h"
#include "libconcord.h"

#ifdef WANT_LIBUSB

#ifndef LC_LIBUSB
#define LC_LIBUSB

#include "hid.h"
#include <usb.h>
#include <errno.h>
#include <string.h>

/*
 * Harmonies either fall under logitech's VendorID (0x046d), and logitech's
 * productID range for Harmonies (0xc110 - 0xc14f)...
 *
 * OR, they fall under 0x400/0xc359 (older 7-series, all 6-series).
 */
#define LOGITECH_VID 0x046D
#define LOGITECH_MIN_PID 0xc110
#define LOGITECH_MAX_PID 0xc14f
#define NATIONAL_VID 0x0400
#define NATIONAL_PID 0xc359

static usb_dev_handle *h_hid = NULL;
static unsigned int irl;
static unsigned int orl;
static int ep_read = -1;
static int ep_write = -1;

int InitUSB()
{
    usb_init();
    return 0;
}

void ShutdownUSB()
{
    if (h_hid) {
        usb_release_interface(h_hid,0);
    }
}

void check_ep(usb_endpoint_descriptor &ued)
{
    debug("address %02X attrib %02X max_length %i",
        ued.bEndpointAddress, ued.bmAttributes,
        ued.wMaxPacketSize);

    if ((ued.bmAttributes & USB_ENDPOINT_TYPE_MASK) ==
        USB_ENDPOINT_TYPE_INTERRUPT) {
        if (ued.bEndpointAddress & USB_ENDPOINT_DIR_MASK) {
            if (ep_read == -1) {
                ep_read = ued.bEndpointAddress;
                // hack! todo: get from HID report descriptor
                irl = ued.wMaxPacketSize;
            }
        } else {
            if (ep_write == -1) {
                ep_write = ued.bEndpointAddress;
                // hack! todo: get from HID report descriptor
                orl = ued.wMaxPacketSize;
            }
        }
    }
}

bool is_harmony(struct usb_device *h_dev)
{
    /* IF vendor == logitech AND product is in range of harmony
     *   OR vendor == National Semiconductor and product is harmony
     */
    if ((h_dev->descriptor.idVendor == LOGITECH_VID
          && (h_dev->descriptor.idProduct >= LOGITECH_MIN_PID
              && h_dev->descriptor.idProduct <= LOGITECH_MAX_PID))
        || (h_dev->descriptor.idVendor == NATIONAL_VID
              && h_dev->descriptor.idProduct == NATIONAL_PID)) {
        return true;
    }
    return false;
}

/*
 * Find a HID device with VendorID == 0x046D ||
 *    (VendorID == 0x0400 && ProductID == 0xC359)
 */
int FindRemote(THIDINFO &hid_info)
{

    usb_find_busses();
    usb_find_devices();

    struct usb_device *h_dev = NULL;
    bool found = false;
    for (usb_bus *bus = usb_busses; bus && !found; bus = bus->next) {
        for (h_dev = bus->devices; h_dev; h_dev = h_dev->next) {
            if (is_harmony(h_dev)) {
                found = true;
                break;
            }
        }
    }

    if (h_dev) {
        h_hid = usb_open(h_dev);
    }
    if (!h_hid) {
        debug("Failed to establish communication with remote: %s",
              usb_strerror());
        return LC_ERROR_CONNECT;
    }

#ifdef linux
    /*
     * Before we attempt to claim the interface, lets go ahead and get
     * the kernel off of it, in case it claimed it already.
     *
     * This is ONLY available when on Linux. We don't check for an error
     * because it will error if no kernel driver is attached to it.
     *
     * Don't attempt to do this if this is a usbnet remote as it will
     * unload the zaurus driver, which is not desired.
     */
    if (!(h_dev && (h_dev->descriptor.idProduct == 0xC11F))) {
        usb_detach_kernel_driver_np(h_hid, 0);
    }
#endif

    int err;

    if ((err=usb_claim_interface(h_hid, 0))) {
        debug("Failed to claim interface: %d (%s)", err,
              usb_strerror());
        return err;
    }

    unsigned char maxconf = h_dev->descriptor.bNumConfigurations;
    for (unsigned char j = 0; j < maxconf; ++j) {
        usb_config_descriptor &uc = h_dev->config[j];
        unsigned char maxint = uc.bNumInterfaces;
        for (unsigned char k = 0; k < maxint; ++k) {
            usb_interface &ui = uc.interface[k];
            unsigned char maxalt = ui.num_altsetting;
            for (unsigned char l = 0; l < maxalt; ++l) {
                usb_interface_descriptor &uid =
                    ui.altsetting[l];

                    debug("bNumEndpoints %i",
                        uid.bNumEndpoints);
                unsigned char maxep = uid.bNumEndpoints;
                for (unsigned char n = 0; n < maxep; ++n) {
                    check_ep(uid.endpoint[n]);
                }
            }
        }
    }

    if (ep_read == -1 || ep_write == -1) return 1;

    // Fill in hid_info

    char s[128];
    usb_get_string_simple(h_hid,h_dev->descriptor.iManufacturer,s,sizeof(s));
    hid_info.mfg = s;
    usb_get_string_simple(h_hid,h_dev->descriptor.iProduct,s,sizeof(s));
    hid_info.prod = s;

    hid_info.vid = h_dev->descriptor.idVendor;
    hid_info.pid = h_dev->descriptor.idProduct;
    hid_info.ver = h_dev->descriptor.bcdDevice;

    hid_info.irl = irl;
    hid_info.orl = orl;
    hid_info.frl = 0;/// ???

    return 0;
}

int HID_WriteReport(const uint8_t *data)
{
    /*
     * In Windows you send an preceeding 0x00 byte with
     * every command, and the codebase used to do that, and we'd
     * skip the first byte here. Now, we do not assume this, we send
     * wholesale here, and add the 0 in the windows code.
     */
    const int err=usb_interrupt_write(h_hid, ep_write,
        reinterpret_cast<char *>(const_cast<uint8_t*>(data)),
        orl, 500);

    if (err < 0) {
        debug("Failed to write to device: %d (%s)", err,
              strerror(-err));
        return err;
    }

    return 0;
}

int HID_ReadReport(uint8_t *data, unsigned int timeout)
{
    /* Note default timeout is set to 500 in hid.h */
    const int err = usb_interrupt_read(h_hid, ep_read,
        reinterpret_cast<char *>(data), irl, timeout);

    if (err == -ETIMEDOUT) {
        debug("Timeout on interrupt read from device");
        return err;
    }

    if (err < 0) {
        debug("Failed to read from device: %d (%s)", err,
              usb_strerror());
        return err;
    }

    return 0;
}

#endif
#endif