From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753821AbcKYMEP (ORCPT ); Fri, 25 Nov 2016 07:04:15 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:44480 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751764AbcKYMEB (ORCPT ); Fri, 25 Nov 2016 07:04:01 -0500 From: Enric Balletbo i Serra To: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Cc: Jonathan Cameron , Lars-Peter Clausen , Gwendal Grignou , Guenter Roeck Subject: [PATCH] iio: cros_ec_light_prox: add ChromeOS EC Light and Proximity Sensors Date: Fri, 25 Nov 2016 13:03:05 +0100 Message-Id: <1480075385-26091-1-git-send-email-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gwendal Grignou Handle Light and Proximity sensors presented by the ChromeOS EC Sensor hub. Creates an IIO device for each functions. Signed-off-by: Gwendal Grignou Signed-off-by: Guenter Roeck Signed-off-by: Enric Balletbo i Serra --- drivers/iio/common/cros_ec_sensors/Kconfig | 8 + drivers/iio/common/cros_ec_sensors/Makefile | 1 + .../common/cros_ec_sensors/cros_ec_light_prox.c | 278 +++++++++++++++++++++ 3 files changed, 287 insertions(+) create mode 100644 drivers/iio/common/cros_ec_sensors/cros_ec_light_prox.c diff --git a/drivers/iio/common/cros_ec_sensors/Kconfig b/drivers/iio/common/cros_ec_sensors/Kconfig index 135f682..4fd0b87 100644 --- a/drivers/iio/common/cros_ec_sensors/Kconfig +++ b/drivers/iio/common/cros_ec_sensors/Kconfig @@ -20,3 +20,11 @@ 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_LIGHT_PROX + tristate "ChromeOS EC Light and Proximity Sensors" + select IIO_CROS_EC_SENSORS_CORE + help + Module to handle Light and Proximity sensors + presented by the ChromeOS EC Sensor hub. + Creates an IIO device for each functions. diff --git a/drivers/iio/common/cros_ec_sensors/Makefile b/drivers/iio/common/cros_ec_sensors/Makefile index ec716ff..7aaf2a2 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_LIGHT_PROX) += cros_ec_light_prox.o diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_light_prox.c b/drivers/iio/common/cros_ec_sensors/cros_ec_light_prox.c new file mode 100644 index 0000000..40a34de --- /dev/null +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_light_prox.c @@ -0,0 +1,278 @@ +/* + * cros_ec_light_prox - Driver for light and prox sensors behing CrosEC. + * + * Copyright (C) 2016 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cros_ec_sensors_core.h" + +/* + * We only represent one entry for light or proximity. EC is merging different + * light sensors to return the what the eye would see. For proximity, we + * currently support only one light source. + */ +#define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1) + +/* 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[CROS_EC_LIGHT_PROX_MAX_CHANNELS]; +}; + +static int cros_ec_light_prox_read(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); + u16 data = 0; + s64 val64; + 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_cmd(indio_dev, 1 << idx, + (s16 *)&data); + if (ret < 0) + break; + *val = data; + break; + case IIO_CHAN_INFO_CALIBBIAS: + st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; + st->core.param.sensor_offset.flags = 0; + + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + if (ret < 0) + break; + + /* Save values */ + st->core.calib[0] = st->core.resp->sensor_offset.offset[0]; + + *val = st->core.calib[idx]; + break; + case IIO_CHAN_INFO_CALIBSCALE: + /* + * RANGE is used for calibration + * scale is a number x.y, where x is coded on 16bits, + * y coded on 16 bits, between 0 and 9999. + */ + st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; + st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE; + + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + if (ret < 0) + break; + + val64 = st->core.resp->sensor_range.ret; + *val = val64 >> 16; + *val2 = (val64 & 0xffff) * 100; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + case IIO_CHAN_INFO_SCALE: + /* + * Light: Result in Lux, using calibration multiplier. + * Prox: Result in cm. + */ + *val = 1; + ret = IIO_VAL_INT; + break; + default: + ret = cros_ec_sensors_core_read(&st->core, chan, val, val2, + mask); + break; + } + + mutex_unlock(&st->core.cmd_lock); + + return ret; +} + +static int cros_ec_light_prox_write(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; + int idx = chan->scan_index; + + mutex_lock(&st->core.cmd_lock); + + switch (mask) { + case IIO_CHAN_INFO_CALIBBIAS: + st->core.calib[idx] = val; + /* Send to EC for each axis, even if not complete */ + st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET; + st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET; + st->core.param.sensor_offset.offset[0] = + st->core.calib[0]; + st->core.param.sensor_offset.temp = + EC_MOTION_SENSE_INVALID_CALIB_TEMP; + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + break; + case IIO_CHAN_INFO_CALIBSCALE: + st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE; + st->core.param.sensor_range.data = (val << 16) | (val2 / 100); + ret = cros_ec_motion_send_host_cmd(&st->core, 0); + break; + default: + ret = cros_ec_sensors_core_write(&st->core, chan, val, val2, + mask); + break; + } + + mutex_unlock(&st->core.cmd_lock); + + return ret; +} + +static const struct iio_info ec_sensors_info = { + .read_raw = &cros_ec_light_prox_read, + .write_raw = &cros_ec_light_prox_write, + .driver_module = THIS_MODULE, +}; + +static int cros_ec_sensors_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent); + struct cros_ec_device *ec_device; + struct iio_dev *indio_dev; + struct cros_ec_sensors_state *state; + struct iio_chan_spec *channel; + int ret; + + if (!ec_dev || !ec_dev->ec_dev) { + dev_warn(&pdev->dev, "No CROS EC device found.\n"); + return -EINVAL; + } + ec_device = ec_dev->ec_dev; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state)); + if (!indio_dev) + return -ENOMEM; + + ret = cros_ec_sensors_core_init(pdev, indio_dev, true); + if (ret) + return ret; + + indio_dev->info = &ec_sensors_info; + state = iio_priv(indio_dev); + state->core.type = state->core.resp->info.type; + state->core.loc = state->core.resp->info.location; + channel = state->channels; + + /* Common part */ + channel->info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_CALIBBIAS) | + BIT(IIO_CHAN_INFO_CALIBSCALE); + channel->info_mask_shared_by_all = + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_SAMP_FREQ) | + BIT(IIO_CHAN_INFO_FREQUENCY); + channel->scan_type.realbits = CROS_EC_SENSOR_BITS; + channel->scan_type.storagebits = CROS_EC_SENSOR_BITS; + channel->ext_info = cros_ec_sensors_ext_info; + + /* Sensor specific */ + switch (state->core.type) { + case MOTIONSENSE_TYPE_LIGHT: + channel->type = IIO_LIGHT; + break; + case MOTIONSENSE_TYPE_PROX: + channel->type = IIO_PROXIMITY; + break; + default: + dev_warn(&pdev->dev, "Unknown motion sensor\n"); + return -EINVAL; + } + + /* 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 = CROS_EC_LIGHT_PROX_MAX_CHANNELS; + + state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd; + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + cros_ec_sensors_capture, NULL); + if (ret) + return ret; + + ret = iio_device_register(indio_dev); + if (ret) + iio_triggered_buffer_cleanup(indio_dev); + + return ret; +} + +static int cros_ec_sensors_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + + return 0; +} + +static const struct platform_device_id cros_ec_sensors_ids[] = { + { + .name = "cros-ec-prox", + }, + { + .name = "cros-ec-light", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, cros_ec_sensors_ids); + +static struct platform_driver cros_ec_sensors_platform_driver = { + .driver = { + .name = "cros-ec-light-prox", + }, + .probe = cros_ec_sensors_probe, + .remove = cros_ec_sensors_remove, + .id_table = cros_ec_sensors_ids, +}; +module_platform_driver(cros_ec_sensors_platform_driver); + +MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver"); +MODULE_LICENSE("GPL v2"); -- 2.1.0