Input: synaptics - gate forcepad support by DMI check

Unfortunately, ForcePad capability is not actually exported over PS/2, so
we have to resort to DMI checks.

Cc: stable@vger.kernel.org
Reported-by: Nicole Faerber <nicole.faerber@kernelconcepts.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 23 insertions, 7 deletions

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 6394d9b5bfd3..9031a0a28ea4 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -607,6 +607,8 @@ static void synaptics_parse_agm(const unsigned char buf[],
         priv->agm_pending = true;
 }
 
+static bool is_forcepad;
+
 static int synaptics_parse_hw_state(const unsigned char buf[],
                                     struct synaptics_data *priv,
                                     struct synaptics_hw_state *hw)
@@ -636,7 +638,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 
-                if (SYN_CAP_FORCEPAD(priv->ext_cap_0c)) {
+                if (is_forcepad) {
                         /*
                          * ForcePads, like Clickpads, use middle button
                          * bits to report primary button clicks.
@@ -1667,11 +1669,29 @@ static const struct dmi_system_id __initconst cr48_dmi_table[] = {
         { }
 };
 
+static const struct dmi_system_id forcepad_dmi_table[] __initconst = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+        {
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook Folio 1040 G1"),
+                },
+        },
+#endif
+        { }
+};
+
 void __init synaptics_module_init(void)
 {
         impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
         broken_olpc_ec = dmi_check_system(olpc_dmi_table);
         cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
+
+        /*
+         * Unfortunately ForcePad capability is not exported over PS/2,
+         * so we have to resort to checking DMI.
+         */
+        is_forcepad = dmi_check_system(forcepad_dmi_table);
 }
 
 static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
index fb2e076738ae..1bd01f21783b 100644
--- a/drivers/input/mouse/synaptics.h
+++ b/drivers/input/mouse/synaptics.h
@@ -77,12 +77,9 @@
  *                                      for noise.
  * 2    0x08    image sensor            image sensor tracks 5 fingers, but only
  *                                      reports 2.
+ * 2    0x01    uniform clickpad        whole clickpad moves instead of being
+ *                                      hinged at the top.
  * 2    0x20    report min              query 0x0f gives min coord reported
- * 2    0x80    forcepad                forcepad is a variant of clickpad that
- *                                      does not have physical buttons but rather
- *                                      uses pressure above certain threshold to
- *                                      report primary clicks. Forcepads also have
- *                                      clickpad bit set.
  */
 #define SYN_CAP_CLICKPAD(ex0c)          ((ex0c) & 0x100000) /* 1-button ClickPad */
 #define SYN_CAP_CLICKPAD2BTN(ex0c)      ((ex0c) & 0x000100) /* 2-button ClickPad */
@@ -91,7 +88,6 @@
 #define SYN_CAP_ADV_GESTURE(ex0c)       ((ex0c) & 0x080000)
 #define SYN_CAP_REDUCED_FILTERING(ex0c) ((ex0c) & 0x000400)
 #define SYN_CAP_IMAGE_SENSOR(ex0c)      ((ex0c) & 0x000800)
-#define SYN_CAP_FORCEPAD(ex0c)          ((ex0c) & 0x008000)
 
 /* synaptics modes query bits */
 #define SYN_MODE_ABSOLUTE(m)            ((m) & (1 << 7))