linux-kernel - [PATCH] Input: ALPS - Report v3 pinnacle trackstick device only if is present

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Date:	Sun, 22 Mar 2015 14:47:47 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Hans de Goede <hdegoede@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH] Input: ALPS - Report v3 pinnacle trackstick device only if is present

This patch move v3 pinnacle code for trackstick detection from alps_hw_init_v3()
to alps_set_protocol() so ALPS_DUALPOINT flag can be cleared before registering
trackstick input device in kernel.

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
 drivers/input/mouse/alps.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index c9cd27a..d24e98d 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1877,15 +1877,12 @@ error:
 
 static int alps_hw_init_v3(struct psmouse *psmouse)
 {
+	struct alps_data *priv = psmouse->private;
 	struct ps2dev *ps2dev = &psmouse->ps2dev;
 	int reg_val;
 	unsigned char param[4];
 
-	reg_val = alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_PINNACLE);
-	if (reg_val == -EIO)
-		goto error;
-
-	if (reg_val == 0 &&
+	if ((priv->flags & ALPS_DUALPOINT) &&
 	    alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
 		goto error;
 
@@ -2249,6 +2246,11 @@ static int alps_set_protocol(struct psmouse *psmouse,
 		priv->decode_fields = alps_decode_pinnacle;
 		priv->nibble_commands = alps_v3_nibble_commands;
 		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+
+		if (alps_probe_trackstick_v3_v7(psmouse,
+						ALPS_REG_BASE_PINNACLE) < 0)
+			priv->flags &= ~ALPS_DUALPOINT;
+
 		break;
 
 	case ALPS_PROTO_V3_RUSHMORE:
-- 
1.7.9.5

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