linux-kernel - [PATCH AUTOSEL 5.2 097/171] mfd: cros_ec: Register cros_ec_lid

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Date:   Thu, 18 Jul 2019 23:55:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Gwendal Grignou <gwendal@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.2 097/171] mfd: cros_ec: Register cros_ec_lid_angle driver when presented

From: Gwendal Grignou <gwendal@...omium.org>

[ Upstream commit 1bb407f17c5316888c3c446e26cb2bb78943f236 ]

Register driver when EC indicates has precise lid angle calculation code
running.
Fix incorrect extra resource allocation in cros_ec_sensors_register().

Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mfd/cros_ec_dev.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index a5391f96eafd..607383b67cf1 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -285,13 +285,15 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 
 	resp = (struct ec_response_motion_sense *)msg->data;
 	sensor_num = resp->dump.sensor_count;
-	/* Allocate 1 extra sensors in FIFO are needed */
-	sensor_cells = kcalloc(sensor_num + 1, sizeof(struct mfd_cell),
+	/*
+	 * Allocate 2 extra sensors if lid angle sensor and/or FIFO are needed.
+	 */
+	sensor_cells = kcalloc(sensor_num + 2, sizeof(struct mfd_cell),
 			       GFP_KERNEL);
 	if (sensor_cells == NULL)
 		goto error;
 
-	sensor_platforms = kcalloc(sensor_num + 1,
+	sensor_platforms = kcalloc(sensor_num,
 				   sizeof(struct cros_ec_sensor_platform),
 				   GFP_KERNEL);
 	if (sensor_platforms == NULL)
@@ -351,6 +353,11 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 		sensor_cells[id].name = "cros-ec-ring";
 		id++;
 	}
+	if (cros_ec_check_features(ec,
+				EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
+		sensor_cells[id].name = "cros-ec-lid-angle";
+		id++;
+	}
 
 	ret = mfd_add_devices(ec->dev, 0, sensor_cells, id,
 			      NULL, 0, NULL);
-- 
2.20.1