From 4318b73549506f88100c4c5a83edd718f0dea6d9 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Mon, 3 Jun 2013 13:59:06 +1000
Subject: [PATCH] Expose phys/uniq to the caller

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
 libevdev/libevdev-int.h   |  2 ++
 libevdev/libevdev.c       | 44 +++++++++++++++++++++++++++++++++++++++
 libevdev/libevdev.h       | 16 ++++++++++++++
 man/Makefile.am           |  1 +
 man/libevdev_get_phys.txt | 41 ++++++++++++++++++++++++++++++++++++
 test/libevdev-print.c     |  2 ++
 6 files changed, 106 insertions(+)
 create mode 100644 man/libevdev_get_phys.txt

diff --git a/libevdev/libevdev-int.h b/libevdev/libevdev-int.h
index b36450c..219d555 100644
--- a/libevdev/libevdev-int.h
+++ b/libevdev/libevdev-int.h
@@ -53,6 +53,8 @@ struct libevdev {
 	libevdev_log_func_t log;
 
 	char name[MAX_NAME];
+	char *phys;
+	char *uniq;
 	struct input_id ids;
 	int driver_version;
 	unsigned long bits[NLONGS(EV_CNT)];
diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 0bac662..0d4600b 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -180,6 +180,8 @@ libevdev_new_from_fd(int fd, struct libevdev **dev)
 void
 libevdev_free(struct libevdev *dev)
 {
+	free(dev->phys);
+	free(dev->uniq);
 	queue_free(dev);
 	free(dev);
 }
@@ -204,6 +206,7 @@ libevdev_set_fd(struct libevdev* dev, int fd)
 {
 	int rc;
 	int i;
+	char buf[256];
 
 	if (dev->fd != -1)
 		return -EBADF;
@@ -216,6 +219,35 @@ libevdev_set_fd(struct libevdev* dev, int fd)
 	if (rc < 0)
 		goto out;
 
+	memset(buf, 0, sizeof(buf));
+	rc = ioctl(fd, EVIOCGPHYS(sizeof(buf) - 1), buf);
+	if (rc < 0) {
+		/* uinput has no phys */
+		if (errno != ENOENT)
+			goto out;
+	} else {
+		dev->phys = calloc(strlen(buf) + 1, sizeof(char));
+		if (!dev->phys) {
+			errno = ENOSPC;
+			goto out;
+		}
+		strcpy(dev->phys, buf);
+	}
+
+	memset(buf, 0, sizeof(buf));
+	rc = ioctl(fd, EVIOCGUNIQ(sizeof(buf) - 1), buf);
+	if (rc < 0) {
+		if (errno != ENOENT)
+			goto out;
+	} else  {
+		dev->uniq = calloc(strlen(buf) + 1, sizeof(char));
+		if (!dev->uniq) {
+			errno = ENOSPC;
+			goto out;
+		}
+		strcpy(dev->uniq, buf);
+	}
+
 	rc = ioctl(fd, EVIOCGID, &dev->ids);
 	if (rc < 0)
 		goto out;
@@ -588,6 +620,18 @@ libevdev_get_name(const struct libevdev *dev)
 	return dev->name;
 }
 
+const char *
+libevdev_get_phys(const struct libevdev *dev)
+{
+	return dev->phys;
+}
+
+const char *
+libevdev_get_uniq(const struct libevdev *dev)
+{
+	return dev->uniq;
+}
+
 int libevdev_get_product_id(const struct libevdev *dev)
 {
 	return dev->ids.product;
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index 169c0bc..79c13b3 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -181,6 +181,22 @@ int libevdev_next_event(struct libevdev *dev, unsigned int flags, struct input_e
  */
 const char* libevdev_get_name(const struct libevdev *dev);
 
+/**
+ * Virtual devices such as uinput devices have no phys location.
+ *
+ * @return The physical location of this device, or NULL if there is none
+ *
+ * @note This function is signal safe.
+ */
+const char * libevdev_get_phys(const struct libevdev *dev);
+
+/**
+ * @return The unique identifier for this device, or NULL if there is none
+ *
+ * @note This function is signal safe.
+ */
+const char * libevdev_get_uniq(const struct libevdev *dev);
+
 /**
  * @return The device's product ID
  *
diff --git a/man/Makefile.am b/man/Makefile.am
index 13fcede..d80a7cc 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -9,6 +9,7 @@ man_src = \
 	libevdev_get_abs_min.txt	\
 	libevdev_get_name.txt		\
 	libevdev_get_num_slots.txt	\
+	libevdev_get_phys.txt		\
 	libevdev_grab.txt		\
 	libevdev_has_event_type.txt	\
 	libevdev_new.txt		\
diff --git a/man/libevdev_get_phys.txt b/man/libevdev_get_phys.txt
new file mode 100644
index 0000000..653ff49
--- /dev/null
+++ b/man/libevdev_get_phys.txt
@@ -0,0 +1,41 @@
+libevdev_get_phys(3)
+====================
+
+NAME
+----
+
+libevdev_get_phys, libevdev_get_uniq - retreive the physical location and unique identifier for this device
+
+SYNOPSIS
+--------
+
+#include <libevdev/libevdev.h>
+
+
+DESCRIPTION
+-----------
+
+*libevdev_get_phys* returns a pointer to a string representing the physical
+location of this device. For virtual devices such as those created by
+uinput, no physical location is available.
+
+*libevdev_get_uniq* returns a pointer to a uniq identifier of this device.
+Not all devices have such an identifier.
+
+PARAMETERS
+----------
+*dev*::
+	Pointer to the libevdev device.
+
+RETURN VALUE
+------------
+*libevdev_get_phys* returns a pointer to a string representing the physical
+location of this device, or NULL if none is defined.
+
+*libevdev_get_uniq* returns a pointer to a uniq identifier of this device,
+or NULL if none is defined.
+
+SEE ALSO
+--------
+
+libevdev_get_name(3)
diff --git a/test/libevdev-print.c b/test/libevdev-print.c
index 5d955a7..e6ecee0 100644
--- a/test/libevdev-print.c
+++ b/test/libevdev-print.c
@@ -137,6 +137,8 @@ main(int argc, char **argv)
 			libevdev_get_product_id(dev));
 	printf("Evdev version: %x\n", libevdev_get_driver_version(dev));
 	printf("Input device name: \"%s\"\n", libevdev_get_name(dev));
+	printf("Phys location: %s\n", libevdev_get_phys(dev));
+	printf("Uniq identifier: %s\n", libevdev_get_uniq(dev));
 	print_bits(dev);
 	print_props(dev);