2 files changed, 10 insertions, 4 deletions

diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index e301887d8523..765d99cdadbb 100644
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -119,8 +119,10 @@ ALPS Absolute Mode - Protocol Version 2
  byte 5:  0   z6   z5   z4   z3   z2   z1   z0
 
 Protocol Version 2 DualPoint devices send standard PS/2 mouse packets for
-the DualPoint Stick. For non interleaved dualpoint devices the pointingstick
-buttons get reported separately in the PSM, PSR and PSL bits.
+the DualPoint Stick. The M, R and L bits signal the combined status of both
+the pointingstick and touchpad buttons, except for Dell dualpoint devices
+where the pointingstick buttons get reported separately in the PSM, PSR
+and PSL bits.
 
 Dualpoint device -- interleaved packet format
 ---------------------------------------------
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 113d6f1516a5..4d246861d692 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -20,6 +20,7 @@
 #include <linux/input/mt.h>
 #include <linux/serio.h>
 #include <linux/libps2.h>
+#include <linux/dmi.h>
 
 #include "psmouse.h"
 #include "alps.h"
@@ -99,6 +100,7 @@ static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
 #define ALPS_FOUR_BUTTONS       0x40    /* 4 direction button present */
 #define ALPS_PS2_INTERLEAVED    0x80    /* 3-byte PS/2 packet interleaved with
                                            6-byte ALPS packet */
+#define ALPS_DELL               0x100   /* device is a Dell laptop */
 #define ALPS_BUTTONPAD          0x200   /* device is a clickpad */
 
 static const struct alps_model_info alps_model_data[] = {
@@ -251,9 +253,9 @@ static void alps_process_packet_v1_v2(struct psmouse *psmouse)
                 return;
         }
 
-        /* Non interleaved V2 dualpoint has separate stick button bits */
+        /* Dell non interleaved V2 dualpoint has separate stick button bits */
         if (priv->proto_version == ALPS_PROTO_V2 &&
-            priv->flags == (ALPS_PASS | ALPS_DUALPOINT)) {
+            priv->flags == (ALPS_DELL | ALPS_PASS | ALPS_DUALPOINT)) {
                 left |= packet[0] & 1;
                 right |= packet[0] & 2;
                 middle |= packet[0] & 4;
@@ -2550,6 +2552,8 @@ static int alps_set_protocol(struct psmouse *psmouse,
         priv->byte0 = protocol->byte0;
         priv->mask0 = protocol->mask0;
         priv->flags = protocol->flags;
+        if (dmi_name_in_vendors("Dell"))
+                priv->flags |= ALPS_DELL;
 
         priv->x_max = 2000;
         priv->y_max = 1400;