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.
---
input/hog_device.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/input/hog_device.c b/input/hog_device.c
index 7a757f4..183da22 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>
@@ -48,6 +52,7 @@
#include "gatt.h"
#define HOG_REPORT_UUID 0x2A4D
+#define UHID_DEVICE_FILE "/dev/uhid"
struct hog_device {
char *path;
@@ -56,13 +61,17 @@ struct hog_device {
guint attioid;
struct gatt_primary *hog_primary;
struct gatt_char *report;
+ 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 - 2;
if (len < 3) {
error("Malformed ATT notification");
@@ -74,6 +83,14 @@ static void report_value_cb(const uint8_t *pdu, uint16_t len, gpointer user_data
DBG("Report(0x%04x): 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x "
"0x%02x", handle, pdu[2], pdu[3], pdu[4],
pdu[5], pdu[6], pdu[7], pdu[8], pdu[9]);
+
+ memset(&ev, 0, sizeof(ev));
+ ev.type = UHID_INPUT;
+ ev.u.input.size = report_size;
+ memcpy(ev.u.input.data, &pdu[2], report_size);
+
+ 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,
@@ -96,6 +113,8 @@ static void report_ccc_written_cb(guint8 status, const guint8 *pdu,
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;
@@ -116,6 +135,22 @@ 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)
@@ -162,11 +197,27 @@ 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, 0666);
+ if (hogdev->uhid_fd < 0)
+ error("Failed to open UHID device: %s", strerror(errno));
}
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_unref(hogdev->attrib);
hogdev->attrib = NULL;
--
1.7.7.6
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