3 files changed, 149 insertions, 0 deletions

diff --git a/drivers/iio/common/cros_ec_sensors/Kconfig b/drivers/iio/common/cros_ec_sensors/Kconfig
index 135f6825903f..aacc2ab9c34f 100644
--- a/drivers/iio/common/cros_ec_sensors/Kconfig
+++ b/drivers/iio/common/cros_ec_sensors/Kconfig
@@ -20,3 +20,12 @@ config IIO_CROS_EC_SENSORS
           Accelerometers, Gyroscope and Magnetometer that are
           presented by the ChromeOS EC Sensor hub.
           Creates an IIO device for each functions.
+
+config IIO_CROS_EC_SENSORS_LID_ANGLE
+        tristate "ChromeOS EC Sensor for lid angle"
+        depends on IIO_CROS_EC_SENSORS_CORE
+        help
+          Module to report the angle between lid and base for some
+          convertible devices.
+          This module is loaded when the EC can calculate the angle between the base
+          and the lid.
diff --git a/drivers/iio/common/cros_ec_sensors/Makefile b/drivers/iio/common/cros_ec_sensors/Makefile
index ec716ff2a775..a35ee232ac07 100644
--- a/drivers/iio/common/cros_ec_sensors/Makefile
+++ b/drivers/iio/common/cros_ec_sensors/Makefile
@@ -4,3 +4,4 @@
 
 obj-$(CONFIG_IIO_CROS_EC_SENSORS_CORE) += cros_ec_sensors_core.o
 obj-$(CONFIG_IIO_CROS_EC_SENSORS) += cros_ec_sensors.o
+obj-$(CONFIG_IIO_CROS_EC_SENSORS_LID_ANGLE) += cros_ec_lid_angle.o
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
new file mode 100644
index 000000000000..876dfd176b0e
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * cros_ec_lid_angle - Driver for CrOS EC lid angle sensor.
+ *
+ * Copyright 2018 Google, Inc
+ *
+ * This driver uses the cros-ec interface to communicate with the Chrome OS
+ * EC about counter sensors. Counters are presented through
+ * iio sysfs.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/common/cros_ec_sensors_core.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/kernel.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "cros-ec-lid-angle"
+
+/*
+ * One channel for the lid angle, the other for timestamp.
+ */
+static const struct iio_chan_spec cros_ec_lid_angle_channels[] = {
+        {
+                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+                .scan_type.realbits = CROS_EC_SENSOR_BITS,
+                .scan_type.storagebits = CROS_EC_SENSOR_BITS,
+                .scan_type.sign = 'u',
+                .type = IIO_ANGL
+        },
+        IIO_CHAN_SOFT_TIMESTAMP(1)
+};
+
+/* State data for ec_sensors iio driver. */
+struct cros_ec_lid_angle_state {
+        /* Shared by all sensors */
+        struct cros_ec_sensors_core_state core;
+};
+
+static int cros_ec_sensors_read_lid_angle(struct iio_dev *indio_dev,
+                                          unsigned long scan_mask, s16 *data)
+{
+        struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+        int ret;
+
+        st->param.cmd = MOTIONSENSE_CMD_LID_ANGLE;
+        ret = cros_ec_motion_send_host_cmd(st, sizeof(st->resp->lid_angle));
+        if (ret) {
+                dev_warn(&indio_dev->dev, "Unable to read lid angle\n");
+                return ret;
+        }
+
+        *data = st->resp->lid_angle.value;
+        return 0;
+}
+
+static int cros_ec_lid_angle_read(struct iio_dev *indio_dev,
+                                    struct iio_chan_spec const *chan,
+                                    int *val, int *val2, long mask)
+{
+        struct cros_ec_lid_angle_state *st = iio_priv(indio_dev);
+        s16 data;
+        int ret;
+
+        mutex_lock(&st->core.cmd_lock);
+        ret = cros_ec_sensors_read_lid_angle(indio_dev, 1, &data);
+        if (ret == 0) {
+                *val = data;
+                ret = IIO_VAL_INT;
+        }
+        mutex_unlock(&st->core.cmd_lock);
+        return ret;
+}
+
+static const struct iio_info cros_ec_lid_angle_info = {
+        .read_raw = &cros_ec_lid_angle_read,
+};
+
+static int cros_ec_lid_angle_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct iio_dev *indio_dev;
+        struct cros_ec_lid_angle_state *state;
+        int ret;
+
+        indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
+        if (!indio_dev)
+                return -ENOMEM;
+
+        ret = cros_ec_sensors_core_init(pdev, indio_dev, false);
+        if (ret)
+                return ret;
+
+        indio_dev->info = &cros_ec_lid_angle_info;
+        state = iio_priv(indio_dev);
+        indio_dev->channels = cros_ec_lid_angle_channels;
+        indio_dev->num_channels = ARRAY_SIZE(cros_ec_lid_angle_channels);
+
+        state->core.read_ec_sensors_data = cros_ec_sensors_read_lid_angle;
+
+        ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+                        cros_ec_sensors_capture, NULL);
+        if (ret)
+                return ret;
+
+        return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct platform_device_id cros_ec_lid_angle_ids[] = {
+        {
+                .name = DRV_NAME,
+        },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, cros_ec_lid_angle_ids);
+
+static struct platform_driver cros_ec_lid_angle_platform_driver = {
+        .driver = {
+                .name   = DRV_NAME,
+                .pm     = &cros_ec_sensors_pm_ops,
+        },
+        .probe          = cros_ec_lid_angle_probe,
+        .id_table       = cros_ec_lid_angle_ids,
+};
+module_platform_driver(cros_ec_lid_angle_platform_driver);
+
+MODULE_DESCRIPTION("ChromeOS EC driver for reporting convertible lid angle.");
+MODULE_LICENSE("GPL v2");