Input: trackpoint - activate protocol when resuming

Trackpoint driver was not sending the magic knock sequence upon resume
causing incorrect device behavior after resuming from disk.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c
index 6d9ec9a..ae5871a 100644 (file)
--- a/drivers/input/mouse/trackpoint.c
+++ b/drivers/input/mouse/trackpoint.c
@@ -183,21 +183,26 @@ static struct attribute_group trackpoint_attr_group = {
        .attrs = trackpoint_attrs,
 };
 
-static void trackpoint_disconnect(struct psmouse *psmouse)
+static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id)
 {
-       sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
+       unsigned char param[2] = { 0 };
 
-       kfree(psmouse->private);
-       psmouse->private = NULL;
+       if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
+               return -1;
+
+       if (param[0] != TP_MAGIC_IDENT)
+               return -1;
+
+       if (firmware_id)
+               *firmware_id = param[1];
+
+       return 0;
 }
 
 static int trackpoint_sync(struct psmouse *psmouse)
 {
-       unsigned char toggle;
        struct trackpoint_data *tp = psmouse->private;
-
-       if (!tp)
-               return -1;
+       unsigned char toggle;
 
        /* Disable features that may make device unusable with this driver */
        trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle);
@@ -263,27 +268,38 @@ static void trackpoint_defaults(struct trackpoint_data *tp)
        tp->ext_dev = TP_DEF_EXT_DEV;
 }
 
+static void trackpoint_disconnect(struct psmouse *psmouse)
+{
+       sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
+
+       kfree(psmouse->private);
+       psmouse->private = NULL;
+}
+
+static int trackpoint_reconnect(struct psmouse *psmouse)
+{
+       if (trackpoint_start_protocol(psmouse, NULL))
+               return -1;
+
+       if (trackpoint_sync(psmouse))
+               return -1;
+
+       return 0;
+}
+
 int trackpoint_detect(struct psmouse *psmouse, int set_properties)
 {
        struct trackpoint_data *priv;
        struct ps2dev *ps2dev = &psmouse->ps2dev;
        unsigned char firmware_id;
        unsigned char button_info;
-       unsigned char param[2];
-
-       param[0] = param[1] = 0;
 
-       if (ps2_command(ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
-               return -1;
-
-       if (param[0] != TP_MAGIC_IDENT)
+       if (trackpoint_start_protocol(psmouse, &firmware_id))
                return -1;
 
        if (!set_properties)
                return 0;
 
-       firmware_id = param[1];
-
        if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
                printk(KERN_WARNING "trackpoint.c: failed to get extended button data\n");
                button_info = 0;
@@ -296,7 +312,7 @@ int trackpoint_detect(struct psmouse *psmouse, int set_properties)
        psmouse->vendor = "IBM";
        psmouse->name = "TrackPoint";
 
-       psmouse->reconnect = trackpoint_sync;
+       psmouse->reconnect = trackpoint_reconnect;
        psmouse->disconnect = trackpoint_disconnect;
 
        trackpoint_defaults(priv);