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hid2hci.c

/*
 *
 *  hid2hci : a tool for switching the radio on devices that support
 *                      it from HID to HCI and back
 *
 *  Copyright (C) 2003-2009  Marcel Holtmann <marcel@holtmann.org>
 *  Copyright (C) 2008-2009  Mario Limonciello <mario_limonciello@dell.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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <sys/ioctl.h>

#include <usb.h>

#ifdef NEED_USB_GET_BUSSES
static inline struct usb_bus *usb_get_busses(void)
{
      return usb_busses;
}
#endif

#ifndef USB_DIR_OUT
#define USB_DIR_OUT     0x00
#endif

static char devpath[PATH_MAX + 1] = "/dev";

struct hiddev_devinfo {
      unsigned int bustype;
      unsigned int busnum;
      unsigned int devnum;
      unsigned int ifnum;
      short vendor;
      short product;
      short version;
      unsigned num_applications;
};

struct hiddev_report_info {
      unsigned report_type;
      unsigned report_id;
      unsigned num_fields;
};

typedef __signed__ int __s32;

struct hiddev_usage_ref {
      unsigned report_type;
      unsigned report_id;
      unsigned field_index;
      unsigned usage_index;
      unsigned usage_code;
      __s32 value;
};

#define HIDIOCGDEVINFO        _IOR('H', 0x03, struct hiddev_devinfo)
#define HIDIOCINITREPORT      _IO('H', 0x05)
#define HIDIOCSREPORT         _IOW('H', 0x08, struct hiddev_report_info)
#define HIDIOCSUSAGE          _IOW('H', 0x0C, struct hiddev_usage_ref)

#define HID_REPORT_TYPE_OUTPUT      2

#define HCI 0
#define HID 1

struct device_info {
      struct usb_device *dev;
      int mode;
      uint16_t vendor;
      uint16_t product;
};

static int switch_csr(struct device_info *devinfo)
{
      struct usb_dev_handle *udev;
      int err;

      udev = usb_open(devinfo->dev);
      if (!udev)
            return -errno;

      err = usb_control_msg(udev, USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        0, devinfo->mode, 0, NULL, 0, 10000);

      if (err == 0) {
            err = -1;
            errno = EALREADY;
      } else {
            if (errno == ETIMEDOUT)
                  err = 0;
      }

      usb_close(udev);

      return err;
}

static int send_report(int fd, const char *buf, size_t size)
{
      struct hiddev_report_info rinfo;
      struct hiddev_usage_ref uref;
      unsigned int i;
      int err;

      for (i = 0; i < size; i++) {
            memset(&uref, 0, sizeof(uref));
            uref.report_type = HID_REPORT_TYPE_OUTPUT;
            uref.report_id   = 0x10;
            uref.field_index = 0;
            uref.usage_index = i;
            uref.usage_code  = 0xff000001;
            uref.value       = buf[i] & 0x000000ff;
            err = ioctl(fd, HIDIOCSUSAGE, &uref);
            if (err < 0)
                  return err;
      }

      memset(&rinfo, 0, sizeof(rinfo));
      rinfo.report_type = HID_REPORT_TYPE_OUTPUT;
      rinfo.report_id   = 0x10;
      rinfo.num_fields  = 1;
      err = ioctl(fd, HIDIOCSREPORT, &rinfo);

      return err;
}

static int switch_logitech(struct device_info *devinfo)
{
      char devname[PATH_MAX + 1];
      int i, fd, err = -1;

      for (i = 0; i < 16; i++) {
            struct hiddev_devinfo dinfo;
            char rep1[] = { 0xff, 0x80, 0x80, 0x01, 0x00, 0x00 };
            char rep2[] = { 0xff, 0x80, 0x00, 0x00, 0x30, 0x00 };
            char rep3[] = { 0xff, 0x81, 0x80, 0x00, 0x00, 0x00 };

            sprintf(devname, "%s/hiddev%d", devpath, i);
            fd = open(devname, O_RDWR);
            if (fd < 0) {
                  sprintf(devname, "%s/usb/hiddev%d", devpath, i);
                  fd = open(devname, O_RDWR);
                  if (fd < 0) {
                        sprintf(devname, "%s/usb/hid/hiddev%d", devpath, i);
                        fd = open(devname, O_RDWR);
                        if (fd < 0)
                              continue;
                  }
            }

            memset(&dinfo, 0, sizeof(dinfo));
            err = ioctl(fd, HIDIOCGDEVINFO, &dinfo);
            if (err < 0 || (int) dinfo.busnum != atoi(devinfo->dev->bus->dirname) ||
                        (int) dinfo.devnum != atoi(devinfo->dev->filename)) {
                  close(fd);
                  continue;
            }

            err = ioctl(fd, HIDIOCINITREPORT, 0);
            if (err < 0) {
                  close(fd);
                  break;
            }

            err = send_report(fd, rep1, sizeof(rep1));
            if (err < 0) {
                  close(fd);
                  break;
            }

            err = send_report(fd, rep2, sizeof(rep2));
            if (err < 0) {
                  close(fd);
                  break;
            }

            err = send_report(fd, rep3, sizeof(rep3));
            close(fd);
            break;
      }

      return err;
}

static int switch_dell(struct device_info *devinfo)
{
      char report[] = { 0x7f, 0x00, 0x00, 0x00 };

      struct usb_dev_handle *handle;
      int err;

      switch (devinfo->mode) {
      case HCI:
            report[1] = 0x13;
            break;
      case HID:
            report[1] = 0x14;
            break;
      }

      handle = usb_open(devinfo->dev);
      if (!handle)
            return -EIO;

      /* Don't need to check return, as might not be in use */
      usb_detach_kernel_driver_np(handle, 0);

      if (usb_claim_interface(handle, 0) < 0) {
            usb_close(handle);
            return -EIO;
      }

      err = usb_control_msg(handle,
            USB_ENDPOINT_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                  USB_REQ_SET_CONFIGURATION, 0x7f | (0x03 << 8), 0,
                                    report, sizeof(report), 5000);

      if (err == 0) {
            err = -1;
            errno = EALREADY;
      } else {
            if (errno == ETIMEDOUT)
                  err = 0;
      }

      usb_close(handle);

      return err;
}

static int find_device(struct device_info* devinfo)
{
      struct usb_bus *bus;
      struct usb_device *dev;

      usb_find_busses();
      usb_find_devices();

      for (bus = usb_get_busses(); bus; bus = bus->next)
            for (dev = bus->devices; dev; dev = dev->next) {
                  if (dev->descriptor.idVendor == devinfo->vendor &&
                      dev->descriptor.idProduct == devinfo->product) {
                        devinfo->dev=dev;
                        return 1;
                  }
            }
      return 0;
}

static void usage(char* error)
{
      if (error)
            fprintf(stderr,"\n%s\n", error);
      else
            printf("hid2hci - Bluetooth HID to HCI mode switching utility\n\n");

      printf("Usage:\n"
            "\thid2hci [options]\n"
            "\n");

      printf("Options:\n"
            "\t-h, --help           Display help\n"
            "\t-q, --quiet          Don't display any messages\n"
            "\t-r, --mode=          Mode to switch to [hid, hci]\n"
            "\t-v, --vendor=        Vendor ID to act upon\n"
            "\t-p, --product=       Product ID to act upon\n"
            "\t-m, --method=        Method to use to switch [csr, logitech, dell]\n"
            "\n");
      if (error)
            exit(1);
}

static const struct option main_options[] = {
      { "help",   no_argument, 0, 'h' },
      { "quiet",  no_argument, 0, 'q' },
      { "mode",   required_argument, 0, 'r' },
      { "vendor", required_argument, 0, 'v' },
      { "product",      required_argument, 0, 'p' },
      { "method", required_argument, 0, 'm' },
      { 0, 0, 0, 0 }
};

int main(int argc, char *argv[])
{
      struct device_info dev = { NULL, HCI, 0, 0 };
      int opt, quiet = 0;
      int (*method)(struct device_info *dev) = NULL;

      while ((opt = getopt_long(argc, argv, "+r:v:p:m:qh", main_options, NULL)) != -1) {
            switch (opt) {
            case 'r':
                  if (optarg && !strcmp(optarg, "hid"))
                        dev.mode = HID;
                  else if (optarg && !strcmp(optarg, "hci"))
                        dev.mode = HCI;
                  else
                        usage("ERROR: Undefined radio mode\n");
                  break;
            case 'v':
                  sscanf(optarg, "%4hx", &dev.vendor);
                  break;
            case 'p':
                  sscanf(optarg, "%4hx", &dev.product);
                  break;
            case 'm':
                  if (optarg && !strcmp(optarg, "csr"))
                        method = switch_csr;
                  else if (optarg && !strcmp(optarg, "logitech"))
                        method = switch_logitech;
                  else if (optarg && !strcmp(optarg, "dell"))
                        method = switch_dell;
                  else
                        usage("ERROR: Undefined switching method\n");
                  break;
            case 'q':
                  quiet = 1;
                  break;
            case 'h':
                  usage(NULL);
            default:
                  exit(0);
            }
      }

      if (!quiet && (!dev.vendor || !dev.product || !method))
            usage("ERROR: Vendor ID, Product ID, and Switching Method must all be defined.\n");

      argc -= optind;
      argv += optind;
      optind = 0;

      usb_init();

      if (!find_device(&dev)) {
            if (!quiet)
                  fprintf(stderr, "Device %04x:%04x not found on USB bus.\n",
                        dev.vendor, dev.product);
            exit(1);
      }

      if (!quiet)
            printf("Attempting to switch device %04x:%04x to %s mode ",
                  dev.vendor, dev.product, dev.mode ? "HID" : "HCI");
      fflush(stdout);

      if (method(&dev) < 0 && !quiet)
            printf("failed (%s)\n", strerror(errno));
      else if (!quiet)
            printf("was successful\n");

      return errno;
}

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