diff options
Diffstat (limited to 'drivers/iio/common')
5 files changed, 328 insertions, 1 deletions
diff --git a/drivers/iio/common/cros_ec_sensors/Kconfig b/drivers/iio/common/cros_ec_sensors/Kconfig index fefad9572790..394e319c9c97 100644 --- a/drivers/iio/common/cros_ec_sensors/Kconfig +++ b/drivers/iio/common/cros_ec_sensors/Kconfig @@ -30,3 +30,12 @@ config IIO_CROS_EC_SENSORS_LID_ANGLE convertible devices. This module is loaded when the EC can calculate the angle between the base and the lid. + +config IIO_CROS_EC_ACTIVITY + tristate "ChromeOS EC Activity Sensors" + depends on IIO_CROS_EC_SENSORS_CORE + help + Module to handle activity events presented by the ChromeOS EC sensor hub. + Activities can be a proximity detector (on body/off body detection) + or a significant motion detector. + Creates an IIO device to manage all activities. diff --git a/drivers/iio/common/cros_ec_sensors/Makefile b/drivers/iio/common/cros_ec_sensors/Makefile index c358fa0328ab..a7dfb5794cae 100644 --- a/drivers/iio/common/cros_ec_sensors/Makefile +++ b/drivers/iio/common/cros_ec_sensors/Makefile @@ -7,3 +7,4 @@ cros-ec-sensors-core-objs += cros_ec_sensors_core.o cros_ec_sensors_trace.o obj-$(CONFIG_IIO_CROS_EC_SENSORS_CORE) += cros-ec-sensors-core.o obj-$(CONFIG_IIO_CROS_EC_SENSORS) += cros_ec_sensors.o obj-$(CONFIG_IIO_CROS_EC_SENSORS_LID_ANGLE) += cros_ec_lid_angle.o +obj-$(CONFIG_IIO_CROS_EC_ACTIVITY) += cros_ec_activity.o diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_activity.c b/drivers/iio/common/cros_ec_sensors/cros_ec_activity.c new file mode 100644 index 000000000000..6e38d115b6fe --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_activity.c @@ -0,0 +1,307 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cros_ec_activity - Driver for activities/gesture recognition. + * + * Copyright 2025 Google, Inc + * + * This driver uses the cros-ec interface to communicate with the ChromeOS + * EC about activity data. + */ + +#include <linux/bits.h> +#include <linux/cleanup.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/types.h> + +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/platform_data/cros_ec_proto.h> + +#include <linux/iio/common/cros_ec_sensors_core.h> +#include <linux/iio/events.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger_consumer.h> + +#define DRV_NAME "cros-ec-activity" + +/* state data for ec_sensors iio driver. */ +struct cros_ec_sensors_state { + /* Shared by all sensors */ + struct cros_ec_sensors_core_state core; + + struct iio_chan_spec *channels; + + int body_detection_channel_index; + int sig_motion_channel_index; +}; + +static const struct iio_event_spec cros_ec_activity_single_shot[] = { + { + .type = IIO_EV_TYPE_CHANGE, + /* significant motion trigger when we get out of still. */ + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static const struct iio_event_spec cros_ec_body_detect_events[] = { + { + .type = IIO_EV_TYPE_CHANGE, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static int cros_ec_activity_sensors_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct cros_ec_sensors_state *st = iio_priv(indio_dev); + int ret; + + if (chan->type != IIO_PROXIMITY || mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + guard(mutex)(&st->core.cmd_lock); + st->core.param.cmd = MOTIONSENSE_CMD_GET_ACTIVITY; + st->core.param.get_activity.activity = + MOTIONSENSE_ACTIVITY_BODY_DETECTION; + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + if (ret) + return ret; + + /* + * EC actually report if a body is near (1) or far (0). + * Units for proximity sensor after scale is in meter, + * so invert the result to return 0m when near and 1m when far. + */ + *val = !st->core.resp->get_activity.state; + return IIO_VAL_INT; +} + +static int cros_ec_activity_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct cros_ec_sensors_state *st = iio_priv(indio_dev); + int ret; + + if (chan->type != IIO_ACTIVITY && chan->type != IIO_PROXIMITY) + return -EINVAL; + + guard(mutex)(&st->core.cmd_lock); + st->core.param.cmd = MOTIONSENSE_CMD_LIST_ACTIVITIES; + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + if (ret) + return ret; + + switch (chan->type) { + case IIO_PROXIMITY: + return !!(st->core.resp->list_activities.enabled & + (1 << MOTIONSENSE_ACTIVITY_BODY_DETECTION)); + case IIO_ACTIVITY: + if (chan->channel2 == IIO_MOD_STILL) { + return !!(st->core.resp->list_activities.enabled & + (1 << MOTIONSENSE_ACTIVITY_SIG_MOTION)); + } + + dev_warn(&indio_dev->dev, "Unknown activity: %d\n", + chan->channel2); + return -EINVAL; + default: + dev_warn(&indio_dev->dev, "Unknown channel type: %d\n", + chan->type); + return -EINVAL; + } +} + +static int cros_ec_activity_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + bool state) +{ + struct cros_ec_sensors_state *st = iio_priv(indio_dev); + + guard(mutex)(&st->core.cmd_lock); + st->core.param.cmd = MOTIONSENSE_CMD_SET_ACTIVITY; + switch (chan->type) { + case IIO_PROXIMITY: + st->core.param.set_activity.activity = + MOTIONSENSE_ACTIVITY_BODY_DETECTION; + break; + case IIO_ACTIVITY: + if (chan->channel2 == IIO_MOD_STILL) { + st->core.param.set_activity.activity = + MOTIONSENSE_ACTIVITY_SIG_MOTION; + break; + } + dev_warn(&indio_dev->dev, "Unknown activity: %d\n", + chan->channel2); + return -EINVAL; + default: + dev_warn(&indio_dev->dev, "Unknown channel type: %d\n", + chan->type); + return -EINVAL; + } + st->core.param.set_activity.enable = state; + return cros_ec_motion_send_host_cmd(&st->core, 0); +} + +static int cros_ec_activity_push_data(struct iio_dev *indio_dev, + s16 *data, s64 timestamp) +{ + struct ec_response_activity_data *activity_data = + (struct ec_response_activity_data *)data; + enum motionsensor_activity activity = activity_data->activity; + u8 state = activity_data->state; + const struct cros_ec_sensors_state *st = iio_priv(indio_dev); + const struct iio_chan_spec *chan; + enum iio_event_direction dir; + int index; + + switch (activity) { + case MOTIONSENSE_ACTIVITY_BODY_DETECTION: + index = st->body_detection_channel_index; + dir = state ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING; + break; + case MOTIONSENSE_ACTIVITY_SIG_MOTION: + index = st->sig_motion_channel_index; + dir = IIO_EV_DIR_FALLING; + break; + default: + dev_warn(&indio_dev->dev, "Unknown activity: %d\n", activity); + return 0; + } + chan = &st->channels[index]; + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(chan->type, index, chan->event_spec[0].type, dir), + timestamp); + return 0; +} + +static irqreturn_t cros_ec_activity_capture(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + + /* + * This callback would be called when a software trigger is + * used. But when this virtual sensor is present, it is guaranteed + * the sensor hub is advanced enough to not need a software trigger. + */ + dev_warn(&indio_dev->dev, "%s: Not Expected\n", __func__); + return IRQ_NONE; +} + +static const struct iio_info ec_sensors_info = { + .read_raw = &cros_ec_activity_sensors_read_raw, + .read_event_config = cros_ec_activity_read_event_config, + .write_event_config = cros_ec_activity_write_event_config, +}; + +static int cros_ec_sensors_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_device *ec_device = dev_get_drvdata(dev->parent); + struct iio_dev *indio_dev; + struct cros_ec_sensors_state *st; + struct iio_chan_spec *channel; + unsigned long activities; + int i, index, ret, nb_activities; + + if (!ec_device) { + dev_warn(dev, "No CROS EC device found.\n"); + return -EINVAL; + } + + indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + ret = cros_ec_sensors_core_init(pdev, indio_dev, true, + cros_ec_activity_capture); + if (ret) + return ret; + + indio_dev->info = &ec_sensors_info; + st = iio_priv(indio_dev); + st->core.type = st->core.resp->info.type; + st->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; + + st->core.param.cmd = MOTIONSENSE_CMD_LIST_ACTIVITIES; + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + if (ret) + return ret; + + activities = st->core.resp->list_activities.enabled | + st->core.resp->list_activities.disabled; + if (!activities) + return -ENODEV; + + /* Allocate a channel per activity and one for timestamp */ + nb_activities = hweight_long(activities) + 1; + st->channels = devm_kcalloc(dev, nb_activities, + sizeof(*st->channels), GFP_KERNEL); + if (!st->channels) + return -ENOMEM; + + channel = &st->channels[0]; + index = 0; + for_each_set_bit(i, &activities, BITS_PER_LONG) { + /* List all available triggers */ + if (i == MOTIONSENSE_ACTIVITY_BODY_DETECTION) { + channel->type = IIO_PROXIMITY; + channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + channel->event_spec = cros_ec_body_detect_events; + channel->num_event_specs = + ARRAY_SIZE(cros_ec_body_detect_events); + st->body_detection_channel_index = index; + } else { + channel->type = IIO_ACTIVITY; + channel->modified = 1; + channel->event_spec = cros_ec_activity_single_shot; + channel->num_event_specs = + ARRAY_SIZE(cros_ec_activity_single_shot); + if (i == MOTIONSENSE_ACTIVITY_SIG_MOTION) { + channel->channel2 = IIO_MOD_STILL; + st->sig_motion_channel_index = index; + } else { + dev_warn(dev, "Unknown activity: %d\n", i); + continue; + } + } + channel->ext_info = cros_ec_sensors_limited_info; + channel->scan_index = index++; + channel++; + } + + /* Timestamp */ + channel->scan_index = index; + channel->type = IIO_TIMESTAMP; + channel->channel = -1; + channel->scan_type.sign = 's'; + channel->scan_type.realbits = 64; + channel->scan_type.storagebits = 64; + + indio_dev->channels = st->channels; + indio_dev->num_channels = index + 1; + + return cros_ec_sensors_core_register(dev, indio_dev, + cros_ec_activity_push_data); +} + +static struct platform_driver cros_ec_sensors_platform_driver = { + .driver = { + .name = DRV_NAME, + }, + .probe = cros_ec_sensors_probe, +}; +module_platform_driver(cros_ec_sensors_platform_driver); + +MODULE_DESCRIPTION("ChromeOS EC activity sensors driver"); +MODULE_ALIAS("platform:" DRV_NAME); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c index 700ebcd68ff4..9ac80e4b7d75 100644 --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c @@ -486,6 +486,16 @@ const struct iio_chan_spec_ext_info cros_ec_sensors_ext_info[] = { }; EXPORT_SYMBOL_GPL(cros_ec_sensors_ext_info); +const struct iio_chan_spec_ext_info cros_ec_sensors_limited_info[] = { + { + .name = "id", + .shared = IIO_SHARED_BY_ALL, + .read = cros_ec_sensors_id + }, + { } +}; +EXPORT_SYMBOL_GPL(cros_ec_sensors_limited_info); + /** * cros_ec_sensors_idx_to_reg - convert index into offset in shared memory * @st: pointer to state information for device diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c index 2055a03cbeb1..a61428bfdce3 100644 --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c @@ -11,7 +11,7 @@ #include <linux/hid-sensor-hub.h> #include <linux/iio/iio.h> -static struct { +static const struct { u32 usage_id; int unit; /* 0 for default others from HID sensor spec */ int scale_val0; /* scale, whole number */ |