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From: Gwendal Grignou <gwendal@chromium.org>
To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de,
	pmeerw@pmeerw.net, lee.jones@linaro.org, bleung@chromium.org,
	enric.balletbo@collabora.com, dianders@chromium.org,
	groeck@chromium.org, fabien.lahoudere@collabora.com
Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
	Gwendal Grignou <gwendal@chromium.org>
Subject: [PATCH 01/13] mfd: cros_ec: Add sensor_count and make check_features public
Date: Sun, 22 Sep 2019 10:50:09 -0700	[thread overview]
Message-ID: <20190922175021.53449-2-gwendal@chromium.org> (raw)
In-Reply-To: <20190922175021.53449-1-gwendal@chromium.org>

Add a new function to return the number of MEMS sensors available in a
ChromeOS Embedded Controller.
It uses MOTIONSENSE_CMD_DUMP if available or a specific memory map ACPI
registers to find out.

Also, make check_features public as it can be useful for other drivers
to know whant the Embedded Controller supports.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
 drivers/mfd/cros_ec_dev.c   | 61 ++++++++++++++++++++++++++++++++++++-
 include/linux/mfd/cros_ec.h | 17 +++++++++++
 2 files changed, 77 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 6e6dfd6c1871..3be80183ccaa 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -112,7 +112,7 @@ static const struct mfd_cell cros_ec_vbc_cells[] = {
 	{ .name = "cros-ec-vbc", }
 };
 
-static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
+int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
 {
 	struct cros_ec_command *msg;
 	int ret;
@@ -143,12 +143,71 @@ static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
 
 	return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
 }
+EXPORT_SYMBOL_GPL(cros_ec_check_features);
 
 static void cros_ec_class_release(struct device *dev)
 {
 	kfree(to_cros_ec_dev(dev));
 }
 
+int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
+{
+	/*
+	 * Issue a command to get the number of sensor reported.
+	 * If not supported, check for legacy mode.
+	 */
+	int ret, sensor_count;
+	struct ec_params_motion_sense *params;
+	struct ec_response_motion_sense *resp;
+	struct cros_ec_command *msg;
+	struct cros_ec_device *ec_dev = ec->ec_dev;
+	u8 status;
+
+	msg = kzalloc(sizeof(struct cros_ec_command) +
+			max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
+	if (msg == NULL)
+		return -ENOMEM;
+
+	msg->version = 1;
+	msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+	msg->outsize = sizeof(*params);
+	msg->insize = sizeof(*resp);
+
+	params = (struct ec_params_motion_sense *)msg->data;
+	params->cmd = MOTIONSENSE_CMD_DUMP;
+
+	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	if (ret < 0) {
+		sensor_count = ret;
+	} else if (msg->result != EC_RES_SUCCESS) {
+		sensor_count = -EPROTO;
+	} else {
+		resp = (struct ec_response_motion_sense *)msg->data;
+		sensor_count = resp->dump.sensor_count;
+	}
+	kfree(msg);
+
+	/*
+	 * Check legacy mode: Let's find out if sensors are accessible
+	 * via LPC interface.
+	 */
+	if (sensor_count == -EPROTO &&
+	    ec->cmd_offset == 0 &&
+	    ec_dev->cmd_readmem) {
+		ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS,
+				1, &status);
+		if ((ret >= 0) &&
+		    (status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
+			/*
+			 * We have 2 sensors, one in the lid, one in the base.
+			 */
+			sensor_count = 2;
+		}
+	}
+	return sensor_count;
+}
+EXPORT_SYMBOL_GPL(cros_ec_get_sensor_count);
+
 static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 {
 	/*
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 61c2875c2a40..578e0bbcafdc 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -32,4 +32,21 @@ struct cros_ec_dev {
 
 #define to_cros_ec_dev(dev)  container_of(dev, struct cros_ec_dev, class_dev)
 
+/**
+ * cros_ec_check_features - Test for the presence of EC features
+ *
+ * Call this function to test whether the ChromeOS EC supports a feature.
+ *
+ * @ec_dev: EC device
+ * @msg: One of ec_feature_code values
+ * @return: 1 if supported, 0 if not
+ */
+int cros_ec_check_features(struct cros_ec_dev *ec, int feature);
+
+/*
+ * Return the number of MEMS sensors supported.
+ * Return < 0 in case of error.
+ */
+int cros_ec_get_sensor_count(struct cros_ec_dev *ec);
+
 #endif /* __LINUX_MFD_CROS_EC_H */
-- 
2.23.0.351.gc4317032e6-goog


  reply	other threads:[~2019-09-22 17:52 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-22 17:50 [PATCH 00/13] cros_ec: Add sensorhub driver and FIFO processing Gwendal Grignou
2019-09-22 17:50 ` Gwendal Grignou [this message]
2019-09-30 13:15   ` [PATCH 01/13] mfd: cros_ec: Add sensor_count and make check_features public Enric Balletbo i Serra
2019-09-30 16:24     ` Gwendal Grignou
2019-10-05 15:26   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 02/13] platform: cros_ec: Add cros_ec_sensor_hub driver Gwendal Grignou
2019-10-01 10:31   ` Enric Balletbo i Serra
2019-10-05 15:35   ` Jonathan Cameron
2019-10-05 15:36     ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 03/13] platform/mfd:iio: cros_ec: Register sensor through sensorhub Gwendal Grignou
2019-10-05 15:41   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 04/13] platform: chrome: cros-ec: record event timestamp in the hard irq Gwendal Grignou
2019-10-01 10:32   ` Enric Balletbo i Serra
2019-10-05 15:44   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 05/13] platform: chrome: cros_ec: Do not attempt to register a non-positive IRQ number Gwendal Grignou
2019-10-01 10:32   ` Enric Balletbo i Serra
2019-09-22 17:50 ` [PATCH 06/13] platform: chrome: cros_ec: handle MKBP more events flag Gwendal Grignou
2019-10-01 10:32   ` Enric Balletbo i Serra
2019-10-05 15:52   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 07/13] platform: chrome: sensorhub: Add FIFO support Gwendal Grignou
2019-10-05 16:08   ` Jonathan Cameron
2019-10-05 16:14     ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 08/13] platform: chrome: sensorhub: Add code to spread timestmap Gwendal Grignou
2019-10-05 16:16   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 09/13] platform: chrome: sensorhub: Add median filter Gwendal Grignou
2019-10-05 16:24   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 10/13] iio: cros_ec: Use triggered buffer only when EC does not support FIFO Gwendal Grignou
2019-10-05 16:30   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 11/13] iio: cros_ec: Expose hwfifo_timeout Gwendal Grignou
2019-10-05 16:35   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 12/13] iio: cros_ec: Report hwfifo_watermark_max Gwendal Grignou
2019-10-05 16:37   ` Jonathan Cameron
2019-09-22 17:50 ` [PATCH 13/13] iio: cros_ec: Use Hertz as unit for sampling frequency Gwendal Grignou
2019-10-05 16:39   ` Jonathan Cameron
2019-10-05 15:39 ` [PATCH 00/13] cros_ec: Add sensorhub driver and FIFO processing Jonathan Cameron

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