[PATCH v2 04/14] xf86Xinput: Modify API for server-managed fd support

[Hans de Goede]

With systemd-logind support, the xserver, rather then the drivers will be
responsible for opening/closing the fd for input devices.

This commit adds a new capabilities field to the InputDriverRec and a
XI86_DRV_CAP_SERVER_FD flag for drivers to indicate that they support server
managed fds.

This commit adds a new XI86_SERVER_FD flag to indicate to drivers when the
server is managing the fd and they should not open/close it. Note that even
if drivers declare they support server managed fds there is no guarantee they
will actually get them.

Since this changes the input driver ABI, this commit bumps it.

systemd-logind tracks devices by their chardev major + minor numbers, since
we are breaking ABI anyways also add major and minor fields for easy storage /
retreival of these.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 hw/xfree86/common/xf86Module.h | 2 +-
 hw/xfree86/common/xf86Xinput.c | 6 ++++++
 hw/xfree86/common/xf86Xinput.h | 7 +++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/hw/xfree86/common/xf86Module.h b/hw/xfree86/common/xf86Module.h
index b6ec19d..96ac3b0 100644
--- a/hw/xfree86/common/xf86Module.h
+++ b/hw/xfree86/common/xf86Module.h
@@ -81,7 +81,7 @@ typedef enum {
  */
 #define ABI_ANSIC_VERSION	SET_ABI_VERSION(0, 4)
 #define ABI_VIDEODRV_VERSION	SET_ABI_VERSION(15, 0)
-#define ABI_XINPUT_VERSION	SET_ABI_VERSION(20, 0)
+#define ABI_XINPUT_VERSION	SET_ABI_VERSION(21, 0)
 #define ABI_EXTENSION_VERSION	SET_ABI_VERSION(8, 0)
 #define ABI_FONT_VERSION	SET_ABI_VERSION(0, 6)
 
diff --git a/hw/xfree86/common/xf86Xinput.c b/hw/xfree86/common/xf86Xinput.c
index 3a01513..6404ef5 100644
--- a/hw/xfree86/common/xf86Xinput.c
+++ b/hw/xfree86/common/xf86Xinput.c
@@ -949,6 +949,12 @@ NewInputDeviceRequest(InputOption *options, InputAttributes * attrs,
                 goto unwind;
             }
         }
+
+        if (strcmp(key, "major") == 0)
+            pInfo->major = atoi(value);
+
+        if (strcmp(key, "minor") == 0)
+            pInfo->minor = atoi(value);
     }
 
     nt_list_for_each_entry(option, options, list.next) {
diff --git a/hw/xfree86/common/xf86Xinput.h b/hw/xfree86/common/xf86Xinput.h
index f94261a..bf81971 100644
--- a/hw/xfree86/common/xf86Xinput.h
+++ b/hw/xfree86/common/xf86Xinput.h
@@ -64,6 +64,10 @@
 /* 0x08 is reserved for legacy XI86_SEND_DRAG_EVENTS, do not use for now */
 /* server-internal only */
 #define XI86_DEVICE_DISABLED    0x10    /* device was disabled before vt switch */
+#define XI86_SERVER_FD		0x20	/* fd is managed by xserver */
+
+/* Input device driver capabilities */
+#define XI86_DRV_CAP_SERVER_FD	0x01
 
 /* This holds the input driver entry and module information. */
 typedef struct _InputDriverRec {
@@ -76,6 +80,7 @@ typedef struct _InputDriverRec {
                     struct _InputInfoRec * pInfo, int flags);
     void *module;
     const char **default_options;
+    int capabilities;
 } InputDriverRec, *InputDriverPtr;
 
 /* This is to input devices what the ScrnInfoRec is to screens. */
@@ -96,6 +101,8 @@ typedef struct _InputInfoRec {
       int *valuators, int first_valuator, int num_valuators);
 
     int fd;
+    int major;
+    int minor;
     DeviceIntPtr dev;
     void *private;
     const char *type_name;
-- 
1.8.5.3