Hi, On 7/3/19 1:35, Gwendal Grignou wrote: > 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@xxxxxxxxxxxx> > --- > Changes in v3: > - Use static channel array, simplify code because index is always 0. > > 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 | 138 ++++++++++++++++++ > drivers/mfd/cros_ec_dev.c | 15 +- Note that this patch depends on https://lkml.org/lkml/2019/2/27/723 to build. Acked-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> Thanks, Enric > 4 files changed, 160 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..92be07d7fa36 > --- /dev/null > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c > @@ -0,0 +1,138 @@ > +// 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) > + return ret; > + *val = data; > + mutex_unlock(&st->core.cmd_lock); > + return IIO_VAL_INT; > +} > + > +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"); > 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); >
