UHID is HID I/O driver that makes possible to implement HID I/O drivers in
user-space. It works similar to the uinput but it is initialized with a HID
descriptor and deals with raw HID reports.
This commit uses UHID to create a HID device for the remote HoG device and
to tranfers HID reports to HID subsystem.
---
acinclude.m4 | 9 +++++++-
configure.ac | 2 +
input/hog_device.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++-
input/main.c | 2 +
input/manager.c | 2 +
5 files changed, 69 insertions(+), 2 deletions(-)
diff --git a/acinclude.m4 b/acinclude.m4
index 8656379..5069878 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -168,6 +168,13 @@ AC_DEFUN([AC_PATH_OUI], [
AC_DEFINE_UNQUOTED(OUIFILE, ["$ac_with_ouifile"], [Define the OUI file path])
])
+AC_DEFUN([AC_PATH_UHID], [
+ AC_CHECK_HEADERS(linux/uhid.h,
+ uhid_found=yes,
+ uhid_found=no
+ )
+])
+
AC_DEFUN([AC_ARG_BLUEZ], [
debug_enable=no
optimization_enable=yes
@@ -392,5 +399,5 @@ AC_DEFUN([AC_ARG_BLUEZ], [
AM_CONDITIONAL(DBUSOOBPLUGIN, test "${dbusoob_enable}" = "yes")
AM_CONDITIONAL(WIIMOTEPLUGIN, test "${wiimote_enable}" = "yes")
AM_CONDITIONAL(GATTMODULES, test "${gatt_enable}" = "yes")
- AM_CONDITIONAL(HOGPLUGIN, test "${gatt_enable}" = "yes" && test "${input_enable}" = "yes")
+ AM_CONDITIONAL(HOGPLUGIN, test "${gatt_enable}" = "yes" && test "${input_enable}" = "yes" && test "${uhid_found}" = "yes")
])
diff --git a/configure.ac b/configure.ac
index f298909..689f189 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,7 @@ AC_CHECK_HEADER([sys/inotify.h],
[AC_DEFINE([HAVE_SYS_INOTIFY_H], 1,
[Define to 1 if you have <sys/inotify.h>.])],
[AC_MSG_ERROR(inotify headers are required and missing)])
+
AC_PATH_DBUS
AC_PATH_GLIB
AC_PATH_ALSA
@@ -49,6 +50,7 @@ AC_PATH_SNDFILE
AC_PATH_OUI
AC_PATH_READLINE
AC_PATH_CHECK
+AC_PATH_UHID
AC_ARG_BLUEZ
diff --git a/input/hog_device.c b/input/hog_device.c
index 923ecf7..45c13b2 100644
--- a/input/hog_device.c
+++ b/input/hog_device.c
@@ -29,6 +29,10 @@
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/uhid.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/uuid.h>
@@ -49,6 +53,11 @@
#define HOG_REPORT_MAP_UUID 0x2A4B
#define HOG_REPORT_UUID 0x2A4D
+#define UHID_DEVICE_FILE "/dev/uhid"
+
+#ifndef MIN
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+#endif
struct report {
struct gatt_char *decl;
@@ -62,13 +71,17 @@ struct hog_device {
guint report_cb_id;
struct gatt_primary *hog_primary;
GSList *reports;
+ int uhid_fd;
};
static GSList *devices = NULL;
static void report_value_cb(const uint8_t *pdu, uint16_t len, gpointer user_data)
{
+ struct hog_device *hogdev = user_data;
+ struct uhid_event ev;
uint16_t handle;
+ uint16_t report_size = len - 3;
if (len < 3) { /* 1-byte opcode + 2-byte handle */
error("Malformed ATT notification");
@@ -76,7 +89,14 @@ static void report_value_cb(const uint8_t *pdu, uint16_t len, gpointer user_data
}
handle = att_get_u16(&pdu[1]);
- DBG("Report notification on handle 0x%04x", handle);
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_INPUT;
+ ev.u.input.size = MIN(report_size, UHID_DATA_MAX);
+ memcpy(ev.u.input.data, &pdu[3], MIN(report_size, UHID_DATA_MAX));
+
+ if (write(hogdev->uhid_fd, &ev, sizeof(ev)) < 0)
+ error("UHID write failed: %s", strerror(errno));
}
static void report_ccc_written_cb(guint8 status, const guint8 *pdu,
@@ -155,6 +175,8 @@ static void discover_descriptor(GAttrib *attrib, struct gatt_char *chr,
static void report_map_read_cb(guint8 status, const guint8 *pdu, guint16 plen,
gpointer user_data)
{
+ struct hog_device *hogdev = user_data;
+ struct uhid_event ev;
uint8_t value[ATT_MAX_MTU];
int vlen, i;
@@ -175,6 +197,22 @@ static void report_map_read_cb(guint8 status, const guint8 *pdu, guint16 plen,
else
DBG("\t %02x %02x", value[i], value[i + 1]);
}
+
+ /* create UHID device */
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_CREATE;
+ /* TODO: get info from DIS */
+ strcpy((char *)ev.u.create.name, "bluez-hog-device");
+ ev.u.create.vendor = 0xBEBA;
+ ev.u.create.product = 0xCAFE;
+ ev.u.create.version = 0;
+ ev.u.create.country = 0;
+ ev.u.create.bus = BUS_USB; /* BUS_BLUETOOTH doesn't work here */
+ ev.u.create.rd_data = value;
+ ev.u.create.rd_size = vlen;
+
+ if (write(hogdev->uhid_fd, &ev, sizeof(ev)) < 0)
+ error("Failed to create UHID device: %s", strerror(errno));
}
static void char_discovered_cb(GSList *chars, guint8 status, gpointer user_data)
@@ -227,6 +265,13 @@ static void attio_connected_cb(GAttrib *attrib, gpointer user_data)
gatt_discover_char(hogdev->attrib, prim->range.start, prim->range.end,
NULL, char_discovered_cb, hogdev);
+ if (hogdev->uhid_fd > 0)
+ return;
+
+ hogdev->uhid_fd = open(UHID_DEVICE_FILE, O_RDWR | O_CLOEXEC);
+ if (hogdev->uhid_fd < 0)
+ error("Failed to open UHID device: %s", strerror(errno));
+
hogdev->report_cb_id = g_attrib_register(hogdev->attrib,
ATT_OP_HANDLE_NOTIFY, report_value_cb,
hogdev, NULL);
@@ -235,6 +280,15 @@ static void attio_connected_cb(GAttrib *attrib, gpointer user_data)
static void attio_disconnected_cb(gpointer user_data)
{
struct hog_device *hogdev = user_data;
+ struct uhid_event ev;
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_DESTROY;
+ if (write(hogdev->uhid_fd, &ev, sizeof(ev)) < 0)
+ error("Failed to destroy UHID device: %s", strerror(errno));
+
+ close(hogdev->uhid_fd);
+ hogdev->uhid_fd = -1;
g_attrib_unregister(hogdev->attrib, hogdev->report_cb_id);
hogdev->report_cb_id = 0;
diff --git a/input/main.c b/input/main.c
index 2aac3db..cea83d8 100644
--- a/input/main.c
+++ b/input/main.c
@@ -85,6 +85,7 @@ static void input_exit(void)
BLUETOOTH_PLUGIN_DEFINE(input, VERSION, BLUETOOTH_PLUGIN_PRIORITY_DEFAULT,
input_init, input_exit)
+#ifdef HAVE_LINUX_UHID_H
static int hog_init(void)
{
return hog_manager_init();
@@ -97,3 +98,4 @@ static void hog_exit(void)
BLUETOOTH_PLUGIN_DEFINE(hog, VERSION, BLUETOOTH_PLUGIN_PRIORITY_DEFAULT,
hog_init, hog_exit)
+#endif
diff --git a/input/manager.c b/input/manager.c
index 3707e88..8692712 100644
--- a/input/manager.c
+++ b/input/manager.c
@@ -196,6 +196,7 @@ void input_manager_exit(void)
connection = NULL;
}
+#ifdef HAVE_LINUX_UHID_H
static int hog_device_probe(struct btd_device *device, GSList *uuids)
{
const char *path = device_get_path(device);
@@ -230,3 +231,4 @@ void hog_manager_exit(void)
{
btd_unregister_device_driver(&hog_driver);
}
+#endif
--
1.7.7.6
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