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
next prev parent 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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