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path: root/drivers/input/mouse/logips2pp.c
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Diffstat (limited to 'drivers/input/mouse/logips2pp.c')
-rw-r--r--drivers/input/mouse/logips2pp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/input/mouse/logips2pp.c b/drivers/input/mouse/logips2pp.c
index d3ddea26b8ca..9df74b72e6c4 100644
--- a/drivers/input/mouse/logips2pp.c
+++ b/drivers/input/mouse/logips2pp.c
@@ -200,6 +200,7 @@ static void ps2pp_disconnect(struct psmouse *psmouse)
static const struct ps2pp_info *get_model_info(unsigned char model)
{
static const struct ps2pp_info ps2pp_list[] = {
+ { 1, 0, 0 }, /* Simple 2-button mouse */
{ 12, 0, PS2PP_SIDE_BTN},
{ 13, 0, 0 },
{ 15, PS2PP_KIND_MX, /* MX1000 */
@@ -338,12 +339,12 @@ int ps2pp_init(struct psmouse *psmouse, int set_properties)
param[1] = 0;
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
- if (!param[1])
- return -1;
-
model = ((param[0] >> 4) & 0x07) | ((param[0] << 3) & 0x78);
buttons = param[1];
+ if (!model || !buttons)
+ return -1;
+
if ((model_info = get_model_info(model)) != NULL) {
/*