/*
* hid2hci : switch the radio on devices that support
* it from HID to HCI and back
*
* Copyright (C) 2003-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2008-2009 Mario Limonciello <mario_limonciello@dell.com>
* Copyright (C) 2009-2011 Kay Sievers <kay.sievers@vrfy.org>
*
* 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
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <getopt.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/hiddev.h>
#include "libudev.h"
#define USB_REQ_SET_CONFIGURATION 0x09
#define USB_TYPE_CLASS (0x01 << 5)
#define USB_TYPE_VENDOR (0x02 << 5)
#define USB_RECIP_DEVICE 0x00
#define USB_RECIP_INTERFACE 0x01
#define USB_ENDPOINT_OUT 0x00
struct usbfs_ctrltransfer {
uint8_t bmRequestType;
uint8_t bRequest;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
uint32_t timeout; /* in milliseconds */
const void *data; /* pointer to data */
};
#define USBFS_DISCONNECT_IF_DRIVER 0x01
#define USBFS_DISCONNECT_EXCEPT_DRIVER 0x02
struct usbfs_disconnect{
unsigned int interface;
unsigned int flags;
char driver[256];
};
#define USBFS_IOCTL_CONTROL _IOWR('U', 0, struct usbfs_ctrltransfer)
#define USBFS_IOCTL_DISCONNECT _IOR('U', 27, struct usbfs_disconnect)
static int control_message(int fd, int requesttype, int request,
int value, int index,
const uint8_t *bytes, int size, int timeout)
{
struct usbfs_ctrltransfer transfer;
transfer.bmRequestType = requesttype;
transfer.bRequest = request;
transfer.wValue = value;
transfer.wIndex = index;
transfer.wLength = size,
transfer.timeout = timeout;
transfer.data = bytes;
if (ioctl(fd, USBFS_IOCTL_CONTROL, &transfer) < 0) {
fprintf(stderr, "Control transfer failed: %s (%d)\n",
strerror(errno), errno);
return -1;
}
return 0;
}
enum mode {
HCI = 0,
HID = 1,
};
static int usb_switch_csr(int fd, enum mode mode)
{
int err;
err = control_message(fd, USB_ENDPOINT_OUT | USB_TYPE_VENDOR |
USB_RECIP_DEVICE,
0, mode, 0, NULL, 0, 10000);
if (err == 0) {
err = -1;
errno = EALREADY;
} else if (errno == ETIMEDOUT)
err = 0;
return err;
}
static int usb_switch_csr2(int fd, enum mode mode)
{
int err = 0;
struct usbfs_disconnect disconnect;
const uint8_t report[] = {
0x01, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
switch (mode) {
case HCI:
/* send report as is */
disconnect.interface = 0;
disconnect.flags = USBFS_DISCONNECT_EXCEPT_DRIVER;
strcpy(disconnect.driver, "usbfs");
if (ioctl(fd, USBFS_IOCTL_DISCONNECT, &disconnect) < 0) {
fprintf(stderr, "Can't claim interface: %s (%d)\n",
strerror(errno), errno);
return -1;
}
/* Set_report request with
* report id: 0x01, report type: feature (0x03)
* on interface 0
*/
err = control_message(fd,
USB_ENDPOINT_OUT | USB_TYPE_CLASS |
USB_RECIP_INTERFACE,
USB_REQ_SET_CONFIGURATION,
0x01 | (0x03 << 8),
0, report, sizeof(report), 5000);
/* unable to detect whether the previous state
* already was HCI (EALREADY)
*/
break;
case HID:
/* currently unknown how to switch to HID */
fprintf(stderr,
"csr2: Switching to hid mode is not implemented\n");
err = -1;
break;
}
return err;
}
static int hid_logitech_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 hid_switch_logitech(const char *filename)
{
char rep1[] = { 0xff, 0x80, 0x80, 0x01, 0x00, 0x00 };
char rep2[] = { 0xff, 0x80, 0x00, 0x00, 0x30, 0x00 };
char rep3[] = { 0xff, 0x81, 0x80, 0x00, 0x00, 0x00 };
int fd;
int err = -1;
fd = open(filename, O_RDWR);
if (fd < 0)
return err;
err = ioctl(fd, HIDIOCINITREPORT, 0);
if (err < 0)
goto out;
err = hid_logitech_send_report(fd, rep1, sizeof(rep1));
if (err < 0)
goto out;
err = hid_logitech_send_report(fd, rep2, sizeof(rep2));
if (err < 0)
goto out;
err = hid_logitech_send_report(fd, rep3, sizeof(rep3));
out:
close(fd);
return err;
}
static int usb_switch_dell(int fd, enum mode mode)
{
uint8_t report[] = { 0x7f, 0x00, 0x00, 0x00 };
struct usbfs_disconnect disconnect;
int err;
switch (mode) {
case HCI:
report[1] = 0x13;
break;
case HID:
report[1] = 0x14;
break;
}
disconnect.interface = 0;
disconnect.flags = USBFS_DISCONNECT_EXCEPT_DRIVER;
strcpy(disconnect.driver, "usbfs");
if (ioctl(fd, USBFS_IOCTL_DISCONNECT, &disconnect) < 0) {
fprintf(stderr, "Can't claim interface: %s (%d)\n",
strerror(errno), errno);
return -1;
}
err = control_message(fd, 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;
}
return err;
}
static int find_device(struct udev_device *udev_dev)
{
char path[PATH_MAX];
const char *busnum_str, *devnum_str;
int busnum, devnum;
int fd;
busnum_str = udev_device_get_sysattr_value(udev_dev, "busnum");
if (!busnum_str)
return -1;
busnum = strtol(busnum_str, NULL, 10);
devnum_str = udev_device_get_sysattr_value(udev_dev, "devnum");
if (!devnum_str)
return -1;
devnum = strtol(devnum_str, NULL, 10);
snprintf(path, sizeof(path), "/dev/bus/usb/%03d/%03d", busnum, devnum);
fd = open(path, O_RDWR, O_CLOEXEC);
if (fd < 0) {
fprintf(stderr, "Can't open device: %s (%d)\n",
strerror(errno), errno);
return -1;
}
return fd;
}
static void usage(const char *error)
{
if (error)
fprintf(stderr,"\n%s\n", error);
else
printf("hid2hci - Bluetooth HID to HCI mode switching utility\n\n");
printf("Usage: hid2hci [options]\n"
" --mode= mode to switch to [hid|hci] (default hci)\n"
" --devpath= sys device path\n"
" --method= method to use to switch [csr|csr2|logitech-hid|dell]\n"
" --help\n\n");
}
int main(int argc, char *argv[])
{
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "mode", required_argument, NULL, 'm' },
{ "devpath", required_argument, NULL, 'p' },
{ "method", required_argument, NULL, 'M' },
{ }
};
enum method {
METHOD_UNDEF,
METHOD_CSR,
METHOD_LOGITECH_HID,
METHOD_DELL,
} method = METHOD_UNDEF;
struct udev *udev;
struct udev_device *udev_dev = NULL;
char syspath[PATH_MAX];
int (*usb_switch)(int fd, enum mode mode) = NULL;
enum mode mode = HCI;
const char *devpath = NULL;
int err = -1;
int rc = 1;
for (;;) {
int option;
option = getopt_long(argc, argv, "m:p:M:h", options, NULL);
if (option == -1)
break;
switch (option) {
case 'm':
if (!strcmp(optarg, "hid")) {
mode = HID;
} else if (!strcmp(optarg, "hci")) {
mode = HCI;
} else {
usage("error: undefined radio mode\n");
exit(1);
}
break;
case 'p':
devpath = optarg;
break;
case 'M':
if (!strcmp(optarg, "csr")) {
method = METHOD_CSR;
usb_switch = usb_switch_csr;
} else if (!strcmp(optarg, "csr2")) {
method = METHOD_CSR;
usb_switch = usb_switch_csr2;
} else if (!strcmp(optarg, "logitech-hid")) {
method = METHOD_LOGITECH_HID;
} else if (!strcmp(optarg, "dell")) {
method = METHOD_DELL;
usb_switch = usb_switch_dell;
} else {
usage("error: undefined switching method\n");
exit(1);
}
break;
case 'h':
usage(NULL);
}
}
if (!devpath || method == METHOD_UNDEF) {
usage("error: --devpath= and --method= must be defined\n");
exit(1);
}
udev = udev_new();
if (udev == NULL)
goto exit;
snprintf(syspath, sizeof(syspath), "/sys/%s", devpath);
udev_dev = udev_device_new_from_syspath(udev, syspath);
if (udev_dev == NULL) {
fprintf(stderr, "error: could not find '%s'\n", devpath);
goto exit;
}
switch (method) {
case METHOD_CSR:
case METHOD_DELL: {
struct udev_device *dev;
int handle;
const char *type;
/* get the parent usb_device if needed */
dev = udev_dev;
type = udev_device_get_devtype(dev);
if (type == NULL || strcmp(type, "usb_device") != 0) {
dev = udev_device_get_parent_with_subsystem_devtype(dev,
"usb", "usb_device");
if (dev == NULL) {
fprintf(stderr, "error: could not find usb_device for '%s'\n", devpath);
goto exit;
}
}
handle = find_device(dev);
if (handle < 0) {
fprintf(stderr, "error: unable to handle '%s'\n",
udev_device_get_syspath(dev));
goto exit;
}
err = usb_switch(handle, mode);
close(handle);
break;
}
case METHOD_LOGITECH_HID: {
const char *device;
device = udev_device_get_devnode(udev_dev);
if (device == NULL) {
fprintf(stderr, "error: could not find hiddev device node\n");
goto exit;
}
err = hid_switch_logitech(device);
break;
}
case METHOD_UNDEF:
default:
break;
}
if (err < 0)
fprintf(stderr, "error: switching device '%s' failed.\n",
udev_device_get_syspath(udev_dev));
exit:
udev_device_unref(udev_dev);
udev_unref(udev);
return rc;
}