hid2hci.c revision 4b6769f61206e90850aff8a30e8e93fbfcc18673
/*
* hid2hci : switch 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>
* Copyright (C) 2009 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
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <linux/hiddev.h>
#include <usb.h>
#include "libudev.h"
#include "libudev-private.h"
enum mode {
HCI = 0,
HID = 1,
};
static int usb_switch_csr(struct usb_dev_handle *dev, enum mode mode)
{
int err;
err = usb_control_msg(dev,
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 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(struct usb_dev_handle *dev, enum mode mode)
{
char report[] = { 0x7f, 0x00, 0x00, 0x00 };
int err;
switch (mode) {
case HCI:
report[1] = 0x13;
break;
case HID:
report[1] = 0x14;
break;
}
/* Don't need to check return, as might not be in use */
usb_detach_kernel_driver_np(dev, 0);
if (usb_claim_interface(dev, 0) < 0)
return -EIO;
err = usb_control_msg(dev,
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;
}
/*
* The braindead libusb needs to scan and open all devices, just to
* to find the device we already have. This needs to be fixed in libusb
* or it will be ripped out and we carry our own code.
*/
static struct usb_device *usb_device_open_from_udev(struct udev_device *usb_dev)
{
struct usb_bus *bus;
const char *str;
int busnum;
int devnum;
str = udev_device_get_sysattr_value(usb_dev, "busnum");
if (str == NULL)
return NULL;
busnum = strtol(str, NULL, 0);
str = udev_device_get_sysattr_value(usb_dev, "devnum");
if (str == NULL)
return NULL;
devnum = strtol(str, NULL, 0);
usb_init();
usb_find_busses();
usb_find_devices();
for (bus = usb_get_busses(); bus; bus = bus->next) {
struct usb_device *dev;
if (strtol(bus->dirname, NULL, 10) != busnum)
continue;
for (dev = bus->devices; dev; dev = dev->next) {
if (dev->devnum == devnum)
return dev;
}
}
return NULL;
}
static struct usb_dev_handle *find_device(struct udev_device *udev_dev, const char *sibling_intf)
{
struct udev *udev = udev_device_get_udev(udev_dev);
struct usb_device *dev;
struct udev_device *udev_parent;
char str[UTIL_NAME_SIZE];
struct udev_enumerate *enumerate;
struct udev_list_entry *entry;
struct usb_dev_handle *handle = NULL;
if (sibling_intf == NULL) {
dev = usb_device_open_from_udev(udev_dev);
if (dev == NULL)
return NULL;
return usb_open(dev);
}
/* find matching sibling of the current usb_device, they share the same hub */
udev_parent = udev_device_get_parent_with_subsystem_devtype(udev_dev, "usb", "usb_device");
if (udev_parent == NULL)
return NULL;
enumerate = udev_enumerate_new(udev);
if (enumerate == NULL)
return NULL;
udev_enumerate_add_match_subsystem(enumerate, "usb");
/* match all childs of the parent */
util_strscpyl(str, sizeof(str), udev_device_get_sysname(udev_parent), "*", NULL);
udev_enumerate_add_match_sysname(enumerate, str);
/* match the specified interface */
util_strscpy(str, sizeof(str), sibling_intf);
str[2] = '\0';
str[5] = '\0';
str[8] = '\0';
if (strcmp(str, "-1") != 0)
udev_enumerate_add_match_sysattr(enumerate, "bInterfaceClass", str);
if (strcmp(&str[3], "-1") != 0)
udev_enumerate_add_match_sysattr(enumerate, "bInterfaceSubClass", &str[3]);
if (strcmp(&str[6], "-1") != 0)
udev_enumerate_add_match_sysattr(enumerate, "bInterfaceProtocol", &str[6]);
udev_enumerate_scan_devices(enumerate);
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(enumerate)) {
struct udev_device *udev_device;
udev_device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(entry));
if (udev_device != NULL) {
/* get the usb_device of the usb_interface we matched */
udev_parent = udev_device_get_parent_with_subsystem_devtype(udev_device, "usb", "usb_device");
if (udev_parent == NULL)
continue;
/* only look at the first matching device */
dev = usb_device_open_from_udev(udev_parent);
if (dev != NULL)
handle = usb_open(dev);
udev_device_unref(udev_device);
break;
}
}
udev_enumerate_unref(enumerate);
return handle;
}
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|logitech-hid|dell]\n"
" --find-sibling-intf= find the sibling device with 00:00:00 (class:subclass:prot)\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' },
{ "find-sibling-intf", required_argument, NULL, 'I' },
{ }
};
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[UTIL_PATH_SIZE];
int (*usb_switch)(struct usb_dev_handle *dev, enum mode mode) = NULL;
enum mode mode = HCI;
const char *devpath = NULL;
const char *sibling_intf = NULL;
int err = -1;
int rc = 1;
for (;;) {
int option;
option = getopt_long(argc, argv, "m:p:M:I:qh", 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, "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 'I':
sibling_intf = optarg;
break;
case 'h':
usage(NULL);
default:
exit(1);
}
}
if (!devpath || method == METHOD_UNDEF) {
usage("error: --devpath= and --method= must be defined\n");
exit(1);
}
udev = udev_new();
if (udev == NULL)
goto exit;
util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
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;
struct usb_dev_handle *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, sibling_intf);
if (handle == NULL) {
fprintf(stderr, "error: unable to handle '%s' (intf=%s)\n",
udev_device_get_syspath(dev), sibling_intf);
goto exit;
}
err = usb_switch(handle, mode);
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;
}
default:
break;
}
if (err < 0)
fprintf(stderr, "error: switching device '%s' (intf=%s) failed.\n",
udev_device_get_syspath(udev_dev), sibling_intf);
exit:
udev_device_unref(udev_dev);
udev_unref(udev);
return rc;
}