linux-kernel - [PATCH v2 9/9] input: psmouse-smbus: allow to control psmouse

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Date:   Mon,  9 Apr 2018 11:10:51 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     kt.liao@....com.tw, Oliver Haessler <oliver@...hat.com>,
        Benjamin Berg <bberg@...hat.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH v2 9/9] input: psmouse-smbus: allow to control psmouse_deactivate

This seems to be Synaptics specific, as some Elan touchpads are not
correctly switching to SMBus if we call deactivate before switching to
SMBus on cold boot and on resume.

Tested with the T480s

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---
changes in v2:
- rebased on top of previous
---
 drivers/input/mouse/elantech.c      |  2 +-
 drivers/input/mouse/psmouse-smbus.c | 13 ++++++++++---
 drivers/input/mouse/psmouse.h       |  1 +
 drivers/input/mouse/synaptics.c     |  2 +-
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 07e40a58e66c..fb4d902c4403 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -1774,7 +1774,7 @@ static int elantech_create_smbus(struct psmouse *psmouse,
 	if (info->has_trackpoint)
 		smbus_board.properties = i2c_properties;
 
-	return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0,
+	return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false,
 				  leave_breadcrumbs);
 }
 
diff --git a/drivers/input/mouse/psmouse-smbus.c b/drivers/input/mouse/psmouse-smbus.c
index c8a3b1f35ce3..852d4b486ddb 100644
--- a/drivers/input/mouse/psmouse-smbus.c
+++ b/drivers/input/mouse/psmouse-smbus.c
@@ -23,6 +23,7 @@ struct psmouse_smbus_dev {
 	struct i2c_client *client;
 	struct list_head node;
 	bool dead;
+	bool need_deactivate;
 };
 
 static LIST_HEAD(psmouse_smbus_list);
@@ -118,7 +119,10 @@ static psmouse_ret_t psmouse_smbus_process_byte(struct psmouse *psmouse)
 
 static int psmouse_smbus_reconnect(struct psmouse *psmouse)
 {
-	psmouse_deactivate(psmouse);
+	struct psmouse_smbus_dev *smbdev = psmouse->private;
+
+	if (smbdev->need_deactivate)
+		psmouse_deactivate(psmouse);
 
 	return 0;
 }
@@ -225,6 +229,7 @@ void psmouse_smbus_cleanup(struct psmouse *psmouse)
 int psmouse_smbus_init(struct psmouse *psmouse,
 		       const struct i2c_board_info *board,
 		       const void *pdata, size_t pdata_size,
+		       bool need_deactivate,
 		       bool leave_breadcrumbs)
 {
 	struct psmouse_smbus_dev *smbdev;
@@ -236,6 +241,7 @@ int psmouse_smbus_init(struct psmouse *psmouse,
 
 	smbdev->psmouse = psmouse;
 	smbdev->board = *board;
+	smbdev->need_deactivate = need_deactivate;
 
 	if (pdata) {
 		smbdev->board.platform_data = kmemdup(pdata, pdata_size,
@@ -246,6 +252,9 @@ int psmouse_smbus_init(struct psmouse *psmouse,
 		}
 	}
 
+	if (need_deactivate)
+		psmouse_deactivate(psmouse);
+
 	psmouse->private = smbdev;
 	psmouse->protocol_handler = psmouse_smbus_process_byte;
 	psmouse->reconnect = psmouse_smbus_reconnect;
@@ -253,8 +262,6 @@ int psmouse_smbus_init(struct psmouse *psmouse,
 	psmouse->disconnect = psmouse_smbus_disconnect;
 	psmouse->resync_time = 0;
 
-	psmouse_deactivate(psmouse);
-
 	mutex_lock(&psmouse_smbus_mutex);
 	list_add_tail(&smbdev->node, &psmouse_smbus_list);
 	mutex_unlock(&psmouse_smbus_mutex);
diff --git a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
index dd4ec1f602d7..64c3a5d3fb3e 100644
--- a/drivers/input/mouse/psmouse.h
+++ b/drivers/input/mouse/psmouse.h
@@ -225,6 +225,7 @@ struct i2c_board_info;
 int psmouse_smbus_init(struct psmouse *psmouse,
 		       const struct i2c_board_info *board,
 		       const void *pdata, size_t pdata_size,
+		       bool need_deactivate,
 		       bool leave_breadcrumbs);
 void psmouse_smbus_cleanup(struct psmouse *psmouse);
 
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 14a1188561aa..6b1ed53a8b03 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -1751,7 +1751,7 @@ static int synaptics_create_intertouch(struct psmouse *psmouse,
 	};
 
 	return psmouse_smbus_init(psmouse, &intertouch_board,
-				  &pdata, sizeof(pdata),
+				  &pdata, sizeof(pdata), true,
 				  leave_breadcrumbs);
 }
 
-- 
2.14.3