Add liblur, a library for logitech unifying receivers

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

.gitignore

@@ -49,3 +49,4 @@ test-*.log
 ratbag-command
 hidpp10-dump-page
 hidpp20-dump-page
+lur-command

src/Makefile.am

@@ -1,9 +1,11 @@
-lib_LTLIBRARIES = libratbag.la
+lib_LTLIBRARIES = libratbag.la \
+		  liblur.la
 noinst_LTLIBRARIES = libhidpp.la \
 		     libutil.la
 
 include_HEADERS =			\
-	libratbag.h
+	libratbag.h			\
+	liblur.h
 
 libratbag_la_SOURCES =			\
 	driver-etekcity.c		\
@@ -33,6 +35,17 @@ EXTRA_libratbag_la_DEPENDENCIES = $(srcdir)/libratbag.sym
 libratbag_la_LDFLAGS = -version-info $(LIBRATBAG_LT_VERSION) -shared \
 		      -Wl,--version-script=$(srcdir)/libratbag.sym
 
+liblur_la_SOURCES = 			\
+	liblur.c			\
+	liblur.h
+liblur_la_LIBADD =			\
+	libhidpp.la			\
+	libutil.la
+liblur_la_CFLAGS = 			\
+	-I$(top_srcdir)/include 	\
+	$(GCC_CFLAGS)
+liblur_la_LDFLAGS = -shared
+
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libratbag.pc
 

src/liblur.c

@@ -0,0 +1,349 @@
+/*
+ * Copyright 2015 Red Hat, Inc
+ *
+ * liblur - Logitech Unifying Receiver access library
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <linux/hidraw.h>
+
+#include "hidpp10.h"
+#include "libratbag-util.h"
+#include "liblur.h"
+
+#define _EXPORT_ __attribute__ ((visibility("default")))
+#define MAX_DEVICES 6
+#define VENDOR_ID_LOGITECH 0x046d
+
+struct lur_receiver {
+	int refcount;
+	int fd;
+	void *userdata;
+
+	struct hidpp10_device *hidppdev;
+
+	struct list devices;
+};
+
+struct lur_device {
+	struct lur_receiver *receiver;
+	int refcount;
+
+	char *name;
+	uint16_t vid, pid;
+	uint32_t serial;
+	enum lur_device_type type;
+
+	int hidppidx;
+
+	struct list node;
+
+	bool present; /* used during re-enumeration */
+};
+
+_EXPORT_ const char *
+lur_device_get_name(struct lur_device *dev)
+{
+	return dev->name;
+}
+
+_EXPORT_ uint16_t
+lur_device_get_vendor_id(struct lur_device *dev)
+{
+	return dev->vid;
+}
+
+
+_EXPORT_ uint16_t
+lur_device_get_product_id(struct lur_device *dev)
+{
+	return dev->pid;
+}
+
+_EXPORT_ enum lur_device_type
+lur_device_get_type(struct lur_device *dev)
+{
+	return dev->type;
+}
+
+_EXPORT_ uint32_t
+lur_device_get_serial(struct lur_device *dev)
+{
+	return dev->serial;
+}
+
+_EXPORT_ int
+lur_device_disconnect(struct lur_device *dev)
+{
+	int rc;
+
+	rc = hidpp10_disconnect(dev->receiver->hidppdev, dev->hidppidx);
+	if (rc == 0) {
+		list_remove(&dev->node);
+		list_init(&dev->node);
+	}
+
+	return rc;
+}
+
+_EXPORT_ int
+lur_is_receiver(uint16_t vid, uint16_t pid)
+{
+	return (vid == VENDOR_ID_LOGITECH && (pid == 0xc52b || pid == 0xc532));
+}
+
+static bool
+hidraw_is_receiver(int fd)
+{
+	struct hidraw_devinfo info;
+	int rc;
+
+	rc = ioctl(fd, HIDIOCGRAWINFO, &info);
+	if (rc < 0)
+		return false;
+	if (!lur_is_receiver(info.vendor, info.product))
+		return false;
+
+	return true;
+}
+
+static struct hidpp10_device *
+hidpp10_init(int fd)
+{
+	struct hidpp_device base;
+
+	hidpp_device_init(&base, fd);
+
+	return hidpp10_device_new(&base, HIDPP_RECEIVER_IDX,
+				  HIDPP10_PROFILE_UNKNOWN);
+}
+
+_EXPORT_ struct lur_receiver*
+lur_receiver_new_from_hidraw(int fd, void *userdata)
+{
+	struct lur_receiver *receiver;
+
+	if (!hidraw_is_receiver(fd))
+		return NULL;
+
+	receiver = zalloc(sizeof(*receiver));
+	receiver->refcount = 1;
+	receiver->fd = fd;
+	receiver->userdata = userdata;
+	list_init(&receiver->devices);
+
+	receiver->hidppdev = hidpp10_init(fd);
+	if (!receiver->hidppdev)
+		goto error;
+
+	return receiver;
+
+error:
+	free(receiver);
+	return NULL;
+
+}
+
+_EXPORT_ int
+lur_receiver_enumerate(struct lur_receiver *lur,
+		       struct lur_device ***devices_out)
+{
+	int i;
+	int ndevices = 0;
+	struct hidpp_device base;
+	struct lur_device *dev, *tmp;
+	int rc;
+	struct lur_device **devices;
+
+	hidpp_device_init(&base, lur->fd);
+
+	list_for_each(dev, &lur->devices, node)
+		dev->present = false;
+
+	for (i = 0; i < MAX_DEVICES; i++) {
+		struct hidpp10_device *d;
+		size_t name_size = 64;
+		char name[name_size];
+		uint8_t interval, type;
+		uint16_t wpid;
+		uint32_t serial;
+		bool is_new_device = true;
+
+		d = hidpp10_device_new(&base, i,
+				  HIDPP10_PROFILE_UNKNOWN);
+		if (!d)
+			continue;
+
+		rc = hidpp10_get_pairing_information_device_name(d, name, &name_size);
+		if (rc)
+			continue;
+
+		rc = hidpp10_get_pairing_information(d, &interval, &wpid, &type);
+		if (rc)
+			continue;
+
+		rc = hidpp10_get_extended_pairing_information(d, &serial);
+		if (rc)
+			continue;
+
+		/* check if we have the device already in the list */
+		list_for_each(dev, &lur->devices, node) {
+			if (dev->pid == wpid &&
+			    dev->type == type &&
+			    dev->serial == serial &&
+			    streq(dev->name, name)) {
+				/* index may have changed, doesn't make it a
+				 * new device, just update it */
+				dev->hidppidx = i;
+				dev->present = true;
+				is_new_device = false;
+				break;
+			}
+		}
+
+		if (is_new_device) {
+			dev = zalloc(sizeof *dev);
+			dev->receiver = lur;
+			lur_receiver_ref(lur);
+			dev->refcount = 1;
+			dev->name = strdup_safe(name);
+			dev->vid = VENDOR_ID_LOGITECH;
+			dev->pid = wpid;
+			dev->type = type;
+			dev->serial = serial;
+			dev->hidppidx = i;
+			dev->present = true;
+			list_insert(&lur->devices, &dev->node);
+		}
+
+		hidpp10_device_destroy(d);
+	}
+
+	devices = zalloc(MAX_DEVICES * sizeof(*devices));
+
+	/* Now drop all devices that disappeared */
+	list_for_each_safe(dev, tmp, &lur->devices, node) {
+		if (dev->present) {
+			devices[ndevices++] = dev;
+		} else {
+			list_remove(&dev->node);
+			list_init(&dev->node);
+			lur_device_unref(dev);
+		}
+	}
+
+	*devices_out = devices;
+
+	return ndevices;
+}
+
+_EXPORT_ int
+lur_receiver_open(struct lur_receiver *lur, uint8_t timeout)
+{
+	return !!hidpp10_open_lock(lur->hidppdev, timeout);
+}
+
+_EXPORT_ int
+lur_receiver_close(struct lur_receiver *lur)
+{
+	return 0;
+}
+
+_EXPORT_ int
+lur_receiver_get_fd(struct lur_receiver *lur)
+{
+	return lur->fd;
+}
+
+_EXPORT_ struct lur_receiver *
+lur_receiver_ref(struct lur_receiver *lur)
+{
+	assert(lur->refcount > 0);
+	lur->refcount++;
+
+	return lur;
+}
+
+_EXPORT_ struct lur_receiver *
+lur_receiver_unref(struct lur_receiver *lur)
+{
+	if (lur == NULL)
+		return NULL;
+
+	assert(lur->refcount > 0);
+	lur->refcount--;
+
+	if (lur->refcount > 0)
+		return NULL;
+
+	/* when we get here, all the devices have alrady been removed from
+	 * the receiver */
+
+	hidpp10_device_destroy(lur->hidppdev);
+	free(lur);
+
+	return NULL;
+}
+
+_EXPORT_ void
+lur_receiver_set_user_data(struct lur_receiver *lur, void *userdata)
+{
+	lur->userdata = userdata;
+}
+
+_EXPORT_ void*
+lur_receiver_get_user_data(const struct lur_receiver *lur)
+{
+	return lur->userdata;
+}
+
+_EXPORT_ struct lur_device *
+lur_device_ref(struct lur_device *dev)
+{
+	assert(dev->refcount > 0);
+	dev->refcount++;
+
+	return dev;
+}
+
+_EXPORT_ struct lur_device *
+lur_device_unref(struct lur_device *dev)
+{
+	if (dev == NULL)
+		return NULL;
+
+	assert(dev->refcount > 0);
+	dev->refcount--;
+
+	if (dev->refcount > 0)
+		return NULL;
+
+	list_remove(&dev->node);
+	lur_receiver_unref(dev->receiver);
+	free(dev->name);
+	free(dev);
+
+	return NULL;
+}

src/liblur.h

@@ -0,0 +1,245 @@
+/*
+ * liblur - Logitech Unifying Receiver access library
+ *
+ * Copyright 2015 Red Hat, Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _LIBLUR_H_
+#define _LIBLUR_H_ 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/**
+ * @struct lur_receiver
+ *
+ * A handle for accessing Logitech Unifying Receivers.
+ *
+ * This struct is refcounted, use lur_device_ref() and lur_device_unref().
+ */
+struct lur_receiver;
+
+/**
+ * @struct lur_device
+ *
+ * A handle for accessing devices paired with a lur_receiver.
+ *
+ * This struct is refcounted, use lur_device_ref() and lur_device_unref().
+ */
+struct lur_device;
+
+enum lur_device_type {
+	LUR_DEVICE_TYPE_UNKNOWN		= 0x00,
+	LUR_DEVICE_TYPE_KEYBOARD	= 0x01,
+	LUR_DEVICE_TYPE_MOUSE		= 0x02,
+	LUR_DEVICE_TYPE_NUMPAD		= 0x03,
+	LUR_DEVICE_TYPE_PRESENTER	= 0x04,
+	LUR_DEVICE_TYPE_TRACKBALL	= 0x08,
+	LUR_DEVICE_TYPE_TOUCHPAD	= 0x09,
+};
+
+const char *
+lur_device_get_name(struct lur_device *dev);
+
+uint16_t
+lur_device_get_vendor_id(struct lur_device *dev);
+
+uint16_t
+lur_device_get_product_id(struct lur_device *dev);
+
+enum lur_device_type
+lur_device_get_type(struct lur_device *dev);
+
+uint32_t
+lur_device_get_serial(struct lur_device *dev);
+
+/**
+ * Disconnect this device from the receiver it is currently paired with.
+ *
+ * @param lur A valid receiver object
+ * @return 0 on success or nonzero on error
+ */
+int
+lur_device_disconnect(struct lur_device *dev);
+
+/**
+ * Returns non-zero if a device with the given vid/pid is a logitech
+ * unifying receiver device.
+ *
+ * @param vid The vendor ID
+ * @param pid The product ID
+ *
+ * @return non-zero if the device is a unifying receiver, zero otherwise
+ */
+int
+lur_is_receiver(uint16_t vid, uint16_t pid);
+
+/**
+ * Creates a new Logitech Unifying Receiver object from the file descriptor.
+ * The fd must be a hidraw device, opened in O_RDWR.
+ *
+ * The returned struct has a refcount of at least 1, use lur_device_unref()
+ * to release resources associated with it.
+ * It is the caller's responsibility to close the fd after the
+ * resources associated with this object have been freed.
+ *
+ * @param fd An O_RDWR file descriptor pointing to a /dev/hidraw node
+ * @param userdata Caller-specific data
+ *
+ * @return A lur object, or NULL on error.
+ */
+struct lur_receiver*
+lur_receiver_new_from_hidraw(int fd, void *userdata);
+
+/**
+ * Enumerate devices currently paired with the given receiver.
+ *
+ * liblur does not have a device detection mechanism, it is recommend that a
+ * caller monitors udev for hidraw devices being added and removed. When
+ * such devices appear or disappear, a call to lur_receiver_enumerate()
+ * yields the new list of devices. If no new unifying devices are available,
+ * the returned list is identical to the list returned in the last call to
+ * lur_receiver_enumerate(). Otherwise, the diff between the two lists
+ * indicate the set of newly added and/or removed devices.
+ *
+ * The devices returned have a refcount of at least 1, use
+ * lur_device_unref(). Repeated calls to this function do not increase the
+ * devices' refcount.
+ *
+ * @param lur A valid receiver object
+ * @param[out] devices An array of devices paired with this receiver. Use
+ * free() to free the array, and lur_device_unref() to destroy each device.
+ *
+ * @return The number of devices returned, or -1 on error.
+ */
+int
+lur_receiver_enumerate(struct lur_receiver *lur,
+		       struct lur_device ***devices);
+
+/**
+ * Allow devices to be paired with this receiver for the given timeout.
+ * Once 'open', the receiver will pair with a currently disconnected
+ * device.
+ *
+ * @param lur A valid receiver object
+ * @param timeout The time in seconds the receiver should accept new
+ * pairings. The value 0 uses the receiver's default value (usually 30s).
+ *
+ * @return 0 on success or nonzero on error
+ */
+int
+lur_receiver_open(struct lur_receiver *lur, uint8_t timeout);
+
+/**
+ * If a receiver is currently accepting devices, stop doing so. If the
+ * receiver is not currently accepting devices, this function has no effect
+ * and returns success.
+ *
+ * @param lur A valid receiver object
+ * @return 0 on success or nonzero on error
+ */
+int
+lur_receiver_close(struct lur_receiver *lur);
+
+/**
+ * Return the file descriptor used to initialize this receiver.
+ *
+ * @param lur A valid receiver object
+ * @return The file descriptor passed into lur_receiver_new_from_hidraw
+ */
+int
+lur_receiver_get_fd(struct lur_receiver* lur);
+
+/**
+ * Add a reference to the context. A context is destroyed whenever the
+ * reference count reaches 0. See @ref lur_unref.
+ *
+ * @param lur A valid receiver object
+ * @return The passed context
+ */
+struct lur_receiver *
+lur_receiver_ref(struct lur_receiver *lur);
+
+/**
+ * Dereference the context. After this, the context may have been
+ * destroyed, if the last reference was dereferenced. If so, the context is
+ * invalid and may not be interacted with.
+ *
+ * @param lur A valid receiver object
+ * @retval NULL
+ */
+struct lur_receiver *
+lur_receiver_unref(struct lur_receiver *lur);
+
+/**
+ * Set caller-specific data associated with this object. liblur does
+ * not manage, look at, or modify this data. The caller must ensure the
+ * data is valid.
+ *
+ * Setting userdata overrides the one provided to
+ * lur_receiver_new_from_hidraw().
+ *
+ * @param lur A valid receiver object
+ * @param userdata Caller-specific data passed to the various callback
+ * interfaces.
+ */
+void
+lur_receiver_set_user_data(struct lur_receiver *lur, void *userdata);
+
+/**
+ * Get the caller-specific data associated with this object, if any.
+ *
+ * @param lur A valid receiver object
+ * @return The caller-specific data previously assigned in
+ * lur_receiver_new_from_hidraw (or lur_receiver_set_user_data()).
+ */
+void*
+lur_receiver_get_user_data(const struct lur_receiver *lur);
+
+/**
+ * Add a reference to the device. A device is destroyed whenever the
+ * reference count reaches 0. See @ref lur_unref.
+ *
+ * @param lur A valid device object
+ * @return The passed device
+ */
+struct lur_device *
+lur_device_ref(struct lur_device *dev);
+
+/**
+ * Dereference the device. After this, the device may have been
+ * destroyed, if the last reference was dereferenced. If so, the device is
+ * invalid and may not be interacted with.
+ *
+ * @param lur A valid device object
+ * @retval NULL
+ */
+struct lur_device *
+lur_device_unref(struct lur_device *dev);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

tools/Makefile.am

@@ -1,5 +1,5 @@
 noinst_PROGRAMS = hidpp10-dump-page hidpp20-dump-page
-bin_PROGRAMS = ratbag-command
+bin_PROGRAMS = ratbag-command lur-command
 noinst_LTLIBRARIES = libshared.la
 
 AM_CPPFLAGS = -I$(top_srcdir)/include \
@@ -25,3 +25,8 @@ hidpp20_dump_page_SOURCES = hidpp20-dump-page.c
 hidpp20_dump_page_LDADD = ../src/libhidpp.la
 hidpp20_dump_page_LDFLAGS = -no-install
 hidpp20_dump_page_CFLAGS = -I$(top_srcdir)/src
+
+lur_command_SOURCeS = lur-command.c
+lur_command_LDADD = ../src/liblur.la
+lur_command_LDFLAGS = -no-install
+lur_command_CFLAGS = -I$(top_srcdir)/src

tools/lur-command.c

@@ -0,0 +1,255 @@
+/*
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#define _GNU_SOURCE
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <liblur.h>
+#include <libratbag-util.h>
+
+enum options {
+	OPT_HELP,
+};
+
+static struct lur_receiver *
+open_receiver(const char *path)
+{
+	struct lur_receiver *receiver;
+	int fd = -1;
+
+	fd = open(path, O_RDWR);
+	if (fd < 0) {
+		fprintf(stderr, "Failed to open %s (%s)\n", path, strerror(errno));
+		return NULL;
+	}
+
+	receiver = lur_receiver_new_from_hidraw(fd, NULL);
+	if (!receiver)
+		close(fd);
+
+	return receiver;
+}
+
+static void
+list_connected_devices(struct lur_receiver *receiver)
+{
+	_cleanup_free_ struct lur_device **devices = NULL;
+	int ndevices;
+	int i;
+
+	ndevices = lur_receiver_enumerate(receiver, &devices);
+	if (ndevices < 0) {
+		fprintf(stderr, "Failed to enumerate devices\n");
+		return;
+	} else if (ndevices == 0) {
+		fprintf(stderr, "No devices connected to this receiver\n");
+		return;
+	}
+
+	for (i = 0; i < ndevices; i++) {
+		struct lur_device *dev = devices[i];
+		const char *name, *strtype;
+		enum lur_device_type type;
+		uint32_t serial;
+
+		name = lur_device_get_name(dev);
+		type = lur_device_get_type(dev);
+		serial = lur_device_get_serial(dev);
+
+		switch(type) {
+		case LUR_DEVICE_TYPE_UNKNOWN:	strtype = "unknown";	break;
+		case LUR_DEVICE_TYPE_KEYBOARD:	strtype = "keyboard";	break;
+		case LUR_DEVICE_TYPE_MOUSE:	strtype = "mouse";	break;
+		case LUR_DEVICE_TYPE_NUMPAD:	strtype = "numpad";	break;
+		case LUR_DEVICE_TYPE_PRESENTER: strtype = "presenter";	break;
+		case LUR_DEVICE_TYPE_TRACKBALL:	strtype = "trackball";	break;
+		case LUR_DEVICE_TYPE_TOUCHPAD:	strtype = "touchpad";	break;
+		default:
+			strtype = "<invalid>";
+			break;
+		}
+
+		printf("%d: %s (%s) serial %#x\n", i, name, strtype, serial);
+
+		lur_device_unref(dev);
+	}
+}
+
+static void
+disconnect_device(struct lur_receiver *receiver, int index)
+{
+	_cleanup_free_ struct lur_device **devices = NULL;
+	int ndevices;
+	int i;
+
+	ndevices = lur_receiver_enumerate(receiver, &devices);
+	if (ndevices < 0) {
+		fprintf(stderr, "Failed to enumerate devices\n");
+		return;
+	} else if (ndevices == 0) {
+		fprintf(stderr, "No devices connected to this receiver\n");
+		return;
+	}
+
+	if (index >= ndevices) {
+		fprintf(stderr, "Invalid index %d, only %d devices connected\n",
+			index, ndevices);
+	} else {
+		lur_device_disconnect(devices[index]);
+	}
+
+	for (i = 0; i < ndevices; i++)
+		lur_device_unref(devices[i]);
+}
+
+static int
+filter_hidraw(const struct dirent *entry)
+{
+	return strneq(entry->d_name, "hidraw", 6);
+}
+
+static void
+find_receiver(void)
+{
+	_cleanup_free_ struct dirent **hidraw_list = NULL;
+	int n, i;
+	char path[PATH_MAX] = {0};
+	bool found = false;
+
+	n = scandir("/dev/", &hidraw_list, filter_hidraw, alphasort);
+	if (n < 0)
+		return;
+
+	for (i = 0; i < n; i++) {
+		struct lur_receiver *receiver;
+		sprintf_safe(path, "/dev/%s", hidraw_list[i]->d_name);
+		receiver = open_receiver(path);
+		if (receiver) {
+			found = true;
+			printf("%s\n", path);
+			lur_receiver_unref(receiver);
+		}
+		free(hidraw_list[i]);
+	}
+
+	if (!found)
+		fprintf(stderr, "No receivers found.\n");
+}
+
+static void
+usage(void)
+{
+	printf("Usage: %s COMMAND /dev/hidrawX\n"
+	       "\n"
+	       "Commands:\n"
+	       "  list ............. list devices connected to receiver\n"
+	       "  open ............. open receiver for pairing (timeout 30s)\n"
+	       "  close ............ close receiver if currently open\n"
+	       "  disconnect N ..... disconnect device N\n"
+	       "  find ............. find a receiver amongst the /dev/hidraw devices \n",
+	       program_invocation_short_name);
+}
+
+int
+main(int argc, char **argv)
+{
+	struct lur_receiver *receiver;
+	const char *path;
+	const char *command;
+
+	while (1) {
+		int c;
+		int option_index = 0;
+		static struct option opts[] = {
+			{ "help", 0, 0, OPT_HELP },
+		};
+
+		c = getopt_long(argc, argv, "+h", opts, &option_index);
+		if (c == -1)
+			break;
+		switch(c) {
+		case 'h':
+		case OPT_HELP:
+			usage();
+			return EXIT_SUCCESS;
+		default:
+			usage();
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (argc < 2) {
+		usage();
+		return EXIT_FAILURE;
+	}
+
+	command = argv[1];
+	if (streq(command, "find")) {
+		find_receiver();
+		return EXIT_SUCCESS;
+	}
+
+	if (argc < 3) {
+		usage();
+		return EXIT_FAILURE;
+	}
+
+	path = argv[argc - 1];
+	receiver = open_receiver(path);
+	if (!receiver) {
+		fprintf(stderr, "Failed to open receiver at %s\n", path);
+		return EXIT_FAILURE;
+	}
+
+	if (streq(command, "list")) {
+		list_connected_devices(receiver);
+	} else if (streq(command, "open")) {
+		lur_receiver_open(receiver, 0);
+	} else if (streq(command, "close")) {
+		lur_receiver_close(receiver);
+	} else if (streq(command, "disconnect")) {
+		int index;
+
+		if (argc < 4) {
+			usage();
+			return EXIT_FAILURE;
+		}
+
+		index = atoi(argv[3]);
+		disconnect_device(receiver, index);
+	} else {
+		usage();
+		return EXIT_FAILURE;
+	}
+
+	lur_receiver_unref(receiver);
+
+	return EXIT_SUCCESS;
+}