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      1 /*
      2  * hid2hci : switch the radio on devices that support
      3  *           it from HID to HCI and back
      4  *
      5  *  Copyright (C) 2003-2010  Marcel Holtmann <marcel (at) holtmann.org>
      6  *  Copyright (C) 2008-2009  Mario Limonciello <mario_limonciello (at) dell.com>
      7  *  Copyright (C) 2009-2011  Kay Sievers <kay.sievers (at) vrfy.org>
      8  *
      9  *  This program is free software; you can redistribute it and/or modify
     10  *  it under the terms of the GNU General Public License as published by
     11  *  the Free Software Foundation; either version 2 of the License, or
     12  *  (at your option) any later version.
     13  *
     14  *  This program is distributed in the hope that it will be useful,
     15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     17  *  GNU General Public License for more details.
     18  *
     19  *  You should have received a copy of the GNU General Public License
     20  *  along with this program; if not, write to the Free Software
     21  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     22  *
     23  */
     24 
     25 #ifdef HAVE_CONFIG_H
     26 #include <config.h>
     27 #endif
     28 
     29 #include <stdio.h>
     30 #include <errno.h>
     31 #include <fcntl.h>
     32 #include <stdint.h>
     33 #include <string.h>
     34 #include <getopt.h>
     35 #include <sys/ioctl.h>
     36 #include <linux/types.h>
     37 #include <linux/hiddev.h>
     38 #include <usb.h>
     39 
     40 #include "libudev.h"
     41 
     42 enum mode {
     43 	HCI = 0,
     44 	HID = 1,
     45 };
     46 
     47 static int usb_switch_csr(struct usb_dev_handle *dev, enum mode mode)
     48 {
     49 	int err;
     50 
     51 	err = usb_control_msg(dev,
     52 			USB_ENDPOINT_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
     53 			0, mode, 0, NULL, 0, 10000);
     54 	if (err == 0) {
     55 		err = -1;
     56 		errno = EALREADY;
     57 	} else if (errno == ETIMEDOUT)
     58 		err = 0;
     59 
     60 	return err;
     61 }
     62 
     63 static int hid_logitech_send_report(int fd, const char *buf, size_t size)
     64 {
     65 	struct hiddev_report_info rinfo;
     66 	struct hiddev_usage_ref uref;
     67 	unsigned int i;
     68 	int err;
     69 
     70 	for (i = 0; i < size; i++) {
     71 		memset(&uref, 0, sizeof(uref));
     72 		uref.report_type = HID_REPORT_TYPE_OUTPUT;
     73 		uref.report_id   = 0x10;
     74 		uref.field_index = 0;
     75 		uref.usage_index = i;
     76 		uref.usage_code  = 0xff000001;
     77 		uref.value       = buf[i] & 0x000000ff;
     78 		err = ioctl(fd, HIDIOCSUSAGE, &uref);
     79 		if (err < 0)
     80 			return err;
     81 	}
     82 
     83 	memset(&rinfo, 0, sizeof(rinfo));
     84 	rinfo.report_type = HID_REPORT_TYPE_OUTPUT;
     85 	rinfo.report_id   = 0x10;
     86 	rinfo.num_fields  = 1;
     87 	err = ioctl(fd, HIDIOCSREPORT, &rinfo);
     88 
     89 	return err;
     90 }
     91 
     92 static int hid_switch_logitech(const char *filename)
     93 {
     94 	char rep1[] = { 0xff, 0x80, 0x80, 0x01, 0x00, 0x00 };
     95 	char rep2[] = { 0xff, 0x80, 0x00, 0x00, 0x30, 0x00 };
     96 	char rep3[] = { 0xff, 0x81, 0x80, 0x00, 0x00, 0x00 };
     97 	int fd;
     98 	int err = -1;
     99 
    100 	fd = open(filename, O_RDWR);
    101 	if (fd < 0)
    102 		return err;
    103 
    104 	err = ioctl(fd, HIDIOCINITREPORT, 0);
    105 	if (err < 0)
    106 		goto out;
    107 
    108 	err = hid_logitech_send_report(fd, rep1, sizeof(rep1));
    109 	if (err < 0)
    110 		goto out;
    111 
    112 	err = hid_logitech_send_report(fd, rep2, sizeof(rep2));
    113 	if (err < 0)
    114 		goto out;
    115 
    116 	err = hid_logitech_send_report(fd, rep3, sizeof(rep3));
    117 out:
    118 	close(fd);
    119 	return err;
    120 }
    121 
    122 static int usb_switch_dell(struct usb_dev_handle *dev, enum mode mode)
    123 {
    124 	char report[] = { 0x7f, 0x00, 0x00, 0x00 };
    125 	int err;
    126 
    127 	switch (mode) {
    128 	case HCI:
    129 		report[1] = 0x13;
    130 		break;
    131 	case HID:
    132 		report[1] = 0x14;
    133 		break;
    134 	}
    135 
    136 	/* Don't need to check return, as might not be in use */
    137 	usb_detach_kernel_driver_np(dev, 0);
    138 
    139 	if (usb_claim_interface(dev, 0) < 0)
    140 		return -EIO;
    141 
    142 	err = usb_control_msg(dev,
    143 			USB_ENDPOINT_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
    144 			USB_REQ_SET_CONFIGURATION, 0x7f | (0x03 << 8), 0,
    145 			report, sizeof(report), 5000);
    146 
    147 	if (err == 0) {
    148 		err = -1;
    149 		errno = EALREADY;
    150 	} else {
    151 		if (errno == ETIMEDOUT)
    152 			err = 0;
    153 	}
    154 	return err;
    155 }
    156 
    157 /*
    158  * libusb needs to scan and open all devices, just to to find the
    159  * device we already have. This should be fixed in libusb.
    160  */
    161 static struct usb_device *usb_device_open_from_udev(struct udev_device *usb_dev)
    162 {
    163 	struct usb_bus *bus;
    164 	const char *str;
    165 	int busnum;
    166 	int devnum;
    167 
    168 	str = udev_device_get_sysattr_value(usb_dev, "busnum");
    169 	if (str == NULL)
    170 		return NULL;
    171 	busnum = strtol(str, NULL, 0);
    172 
    173 	str = udev_device_get_sysattr_value(usb_dev, "devnum");
    174 	if (str == NULL)
    175 		return NULL;
    176 	devnum = strtol(str, NULL, 0);
    177 
    178 	usb_init();
    179 	usb_find_busses();
    180 	usb_find_devices();
    181 
    182 	for (bus = usb_get_busses(); bus; bus = bus->next) {
    183 		struct usb_device *dev;
    184 
    185 		if (strtol(bus->dirname, NULL, 10) != busnum)
    186 			continue;
    187 
    188 		for (dev = bus->devices; dev; dev = dev->next) {
    189 			if (dev->devnum == devnum)
    190 				return dev;
    191 		}
    192 	}
    193 
    194 	return NULL;
    195 }
    196 
    197 static struct usb_dev_handle *find_device(struct udev_device *udev_dev)
    198 {
    199 	struct usb_device *dev;
    200 
    201 	dev = usb_device_open_from_udev(udev_dev);
    202 	if (dev == NULL)
    203 		return NULL;
    204 	return usb_open(dev);
    205 }
    206 
    207 static void usage(const char *error)
    208 {
    209 	if (error)
    210 		fprintf(stderr,"\n%s\n", error);
    211 	else
    212 		printf("hid2hci - Bluetooth HID to HCI mode switching utility\n\n");
    213 
    214 	printf("Usage: hid2hci [options]\n"
    215 		"  --mode=               mode to switch to [hid|hci] (default hci)\n"
    216 		"  --devpath=            sys device path\n"
    217 		"  --method=             method to use to switch [csr|logitech-hid|dell]\n"
    218 		"  --help\n\n");
    219 }
    220 
    221 int main(int argc, char *argv[])
    222 {
    223 	static const struct option options[] = {
    224 		{ "help", no_argument, NULL, 'h' },
    225 		{ "mode", required_argument, NULL, 'm' },
    226 		{ "devpath", required_argument, NULL, 'p' },
    227 		{ "method", required_argument, NULL, 'M' },
    228 		{ }
    229 	};
    230 	enum method {
    231 		METHOD_UNDEF,
    232 		METHOD_CSR,
    233 		METHOD_LOGITECH_HID,
    234 		METHOD_DELL,
    235 	} method = METHOD_UNDEF;
    236 	struct udev *udev;
    237 	struct udev_device *udev_dev = NULL;
    238 	char syspath[PATH_MAX];
    239 	int (*usb_switch)(struct usb_dev_handle *dev, enum mode mode) = NULL;
    240 	enum mode mode = HCI;
    241 	const char *devpath = NULL;
    242 	int err = -1;
    243 	int rc = 1;
    244 
    245 	for (;;) {
    246 		int option;
    247 
    248 		option = getopt_long(argc, argv, "m:p:M:h", options, NULL);
    249 		if (option == -1)
    250 			break;
    251 
    252 		switch (option) {
    253 		case 'm':
    254 			if (!strcmp(optarg, "hid")) {
    255 				mode = HID;
    256 			} else if (!strcmp(optarg, "hci")) {
    257 				mode = HCI;
    258 			} else {
    259 				usage("error: undefined radio mode\n");
    260 				exit(1);
    261 			}
    262 			break;
    263 		case 'p':
    264 			devpath = optarg;
    265 			break;
    266 		case 'M':
    267 			if (!strcmp(optarg, "csr")) {
    268 				method = METHOD_CSR;
    269 				usb_switch = usb_switch_csr;
    270 			} else if (!strcmp(optarg, "logitech-hid")) {
    271 				method = METHOD_LOGITECH_HID;
    272 			} else if (!strcmp(optarg, "dell")) {
    273 				method = METHOD_DELL;
    274 				usb_switch = usb_switch_dell;
    275 			} else {
    276 				usage("error: undefined switching method\n");
    277 				exit(1);
    278 			}
    279 			break;
    280 		case 'h':
    281 			usage(NULL);
    282 		}
    283 	}
    284 
    285 	if (!devpath || method == METHOD_UNDEF) {
    286 		usage("error: --devpath= and --method= must be defined\n");
    287 		exit(1);
    288 	}
    289 
    290 	udev = udev_new();
    291 	if (udev == NULL)
    292 		goto exit;
    293 
    294 	snprintf(syspath, sizeof(syspath), "%s/%s", udev_get_sys_path(udev), devpath);
    295 	udev_dev = udev_device_new_from_syspath(udev, syspath);
    296 	if (udev_dev == NULL) {
    297 		fprintf(stderr, "error: could not find '%s'\n", devpath);
    298 		goto exit;
    299 	}
    300 
    301 	switch (method) {
    302 	case METHOD_CSR:
    303 	case METHOD_DELL: {
    304 		struct udev_device *dev;
    305 		struct usb_dev_handle *handle;
    306 		const char *type;
    307 
    308 		/* get the parent usb_device if needed */
    309 		dev = udev_dev;
    310 		type = udev_device_get_devtype(dev);
    311 		if (type == NULL || strcmp(type, "usb_device") != 0) {
    312 			dev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_device");
    313 			if (dev == NULL) {
    314 				fprintf(stderr, "error: could not find usb_device for '%s'\n", devpath);
    315 				goto exit;
    316 			}
    317 		}
    318 
    319 		handle = find_device(dev);
    320 		if (handle == NULL) {
    321 			fprintf(stderr, "error: unable to handle '%s'\n",
    322 				udev_device_get_syspath(dev));
    323 			goto exit;
    324 		}
    325 		err = usb_switch(handle, mode);
    326 		break;
    327 	}
    328 	case METHOD_LOGITECH_HID: {
    329 		const char *device;
    330 
    331 		device = udev_device_get_devnode(udev_dev);
    332 		if (device == NULL) {
    333 			fprintf(stderr, "error: could not find hiddev device node\n");
    334 			goto exit;
    335 		}
    336 		err = hid_switch_logitech(device);
    337 		break;
    338 	}
    339 	default:
    340 		break;
    341 	}
    342 
    343 	if (err < 0)
    344 		fprintf(stderr, "error: switching device '%s' failed.\n",
    345 			udev_device_get_syspath(udev_dev));
    346 exit:
    347 	udev_device_unref(udev_dev);
    348 	udev_unref(udev);
    349 	return rc;
    350 }
    351