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List: linux-iio
Subject: [PATCH v2] iio: cros_ec: Add lid angle driver
From: Gwendal Grignou <gwendal () chromium ! org>
Date: 2019-02-28 17:41:54
Message-ID: 20190228174154.223930-1-gwendal () chromium ! org
[Download RAW message or body]
Add a IIO driver that reports the angle between the lid and the base for
ChromeOS convertible device.
Tested on eve with ToT EC firmware.
Check driver is loaded and lid angle is correct.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
Changes in v2:
- Fix license, remove driver_module field.
drivers/iio/common/cros_ec_sensors/Kconfig | 9 +
drivers/iio/common/cros_ec_sensors/Makefile | 1 +
.../cros_ec_sensors/cros_ec_lid_angle.c | 163 ++++++++++++++++++
drivers/mfd/cros_ec_dev.c | 15 +-
4 files changed, 185 insertions(+), 3 deletions(-)
create mode 100644 drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
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..09d30976a743
--- /dev/null
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
@@ -0,0 +1,163 @@
+// 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.
+ */
+#define MAX_CHANNELS (1 + 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;
+
+ struct iio_chan_spec channels[MAX_CHANNELS];
+};
+
+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;
+ }
+
+ if (scan_mask & 1)
+ *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);
+ u16 data;
+ int ret;
+ int idx = chan->scan_index;
+
+ mutex_lock(&st->core.cmd_lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = cros_ec_sensors_read_lid_angle(
+ indio_dev, 1 << idx, &data);
+ if (ret)
+ break;
+ ret = IIO_VAL_INT;
+ *val = data;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ 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;
+ struct iio_chan_spec *channel;
+ 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);
+ channel = state->channels;
+
+ channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+ channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
+ channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
+ channel->scan_type.shift = 0;
+ channel->scan_index = 0;
+ channel->scan_type.sign = 'u';
+ channel->type = IIO_ANGL;
+
+ state->core.calib[0] = 0;
+
+ /* Timestamp */
+ channel++;
+ channel->type = IIO_TIMESTAMP;
+ channel->channel = -1;
+ channel->scan_index = 1;
+ channel->scan_type.sign = 's';
+ channel->scan_type.realbits = 64;
+ channel->scan_type.storagebits = 64;
+
+ indio_dev->channels = state->channels;
+ indio_dev->num_channels = MAX_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");
diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index d275deaecb12..11b5b2fd1f33 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -297,13 +297,17 @@ 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 extra sensors if lid angle sensor or FIFO are needed.
+ */
+#define NUM_EXTRA_SENSORS 2
+ sensor_cells = kcalloc(sensor_num + NUM_EXTRA_SENSORS,
+ 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)
@@ -363,6 +367,11 @@ 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);
--
2.21.0.rc2.261.ga7da99ff1b-goog
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