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@holtmann.org>
6 * Copyright (C) 2008-2009 Mario Limonciello <mario_limonciello@dell.com>
7 * Copyright (C) 2009-2011 Kay Sievers <kay.sievers@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
usb_switch_csr(struct usb_dev_handle * dev,enum mode mode)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
hid_logitech_send_report(int fd,const char * buf,size_t size)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
hid_switch_logitech(const char * filename)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
usb_switch_dell(struct usb_dev_handle * dev,enum mode mode)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 */
usb_device_open_from_udev(struct udev_device * usb_dev)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
find_device(struct udev_device * udev_dev)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
usage(const char * error)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
main(int argc,char * argv[])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