X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=drivers%2Fmfd%2Fcros_ec_dev.c;h=41dccced502668d9cd4f49ce41496471b4c7adf2;hb=8de262531f5fbb7458463224a7587429800c24bf;hp=a5391f96eafd14c2b3b7f1b93fb82ce82523807c;hpb=5450e8a316a64cddcbc15f90733ebc78aa736545;p=linux-2.6-microblaze.git

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index a5391f96eafd..41dccced5026 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);
@@ -364,6 +371,72 @@ error:
 	kfree(msg);
 }
 
+static struct cros_ec_sensor_platform sensor_platforms[] = {
+	{ .sensor_num = 0 },
+	{ .sensor_num = 1 }
+};
+
+static const struct mfd_cell cros_ec_accel_legacy_cells[] = {
+	{
+		.name = "cros-ec-accel-legacy",
+		.platform_data = &sensor_platforms[0],
+		.pdata_size = sizeof(struct cros_ec_sensor_platform),
+	},
+	{
+		.name = "cros-ec-accel-legacy",
+		.platform_data = &sensor_platforms[1],
+		.pdata_size = sizeof(struct cros_ec_sensor_platform),
+	}
+};
+
+static void cros_ec_accel_legacy_register(struct cros_ec_dev *ec)
+{
+	struct cros_ec_device *ec_dev = ec->ec_dev;
+	u8 status;
+	int ret;
+
+	/*
+	 * ECs that need legacy support are the main EC, directly connected to
+	 * the AP.
+	 */
+	if (ec->cmd_offset != 0)
+		return;
+
+	/*
+	 * Check if EC supports direct memory reads and if EC has
+	 * accelerometers.
+	 */
+	if (ec_dev->cmd_readmem) {
+		ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS, 1,
+					  &status);
+		if (ret < 0) {
+			dev_warn(ec->dev, "EC direct read error.\n");
+			return;
+		}
+
+		/* Check if EC has accelerometers. */
+		if (!(status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
+			dev_info(ec->dev, "EC does not have accelerometers.\n");
+			return;
+		}
+	}
+
+	/*
+	 * The device may still support accelerometers:
+	 * it would be an older ARM based device that do not suppor the
+	 * EC_CMD_GET_FEATURES command.
+	 *
+	 * Register 2 accelerometers, we will fail in the IIO driver if there
+	 * are no sensors.
+	 */
+	ret = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
+			      cros_ec_accel_legacy_cells,
+			      ARRAY_SIZE(cros_ec_accel_legacy_cells),
+			      NULL, 0, NULL);
+	if (ret)
+		dev_err(ec_dev->dev, "failed to add EC sensors\n");
+}
+
 static const struct mfd_cell cros_ec_cec_cells[] = {
 	{ .name = "cros-ec-cec" }
 };
@@ -440,6 +513,16 @@ static int ec_device_probe(struct platform_device *pdev)
 		ec_platform->ec_name = CROS_EC_DEV_TP_NAME;
 	}
 
+	/* Check whether this is actually a SCP rather than an EC. */
+	if (cros_ec_check_features(ec, EC_FEATURE_SCP)) {
+		dev_info(dev, "CrOS SCP MCU detected.\n");
+		/*
+		 * Help userspace differentiating ECs from SCP,
+		 * regardless of the probing order.
+		 */
+		ec_platform->ec_name = CROS_EC_DEV_SCP_NAME;
+	}
+
 	/*
 	 * Add the class device
 	 * Link to the character device for creating the /dev entry
@@ -459,6 +542,9 @@ static int ec_device_probe(struct platform_device *pdev)
 	/* check whether this EC is a sensor hub. */
 	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
 		cros_ec_sensors_register(ec);
+	else
+		/* Workaroud for older EC firmware */
+		cros_ec_accel_legacy_register(ec);
 
 	/* Check whether this EC instance has CEC host command support */
 	if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {