267 lines
6.9 KiB
C
267 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* cros_ec_light_prox - Driver for light and prox sensors behing CrosEC.
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*
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* Copyright (C) 2017 Google, Inc
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*/
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#include <linux/device.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/common/cros_ec_sensors_core.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/kfifo_buf.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_data/cros_ec_commands.h>
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#include <linux/platform_data/cros_ec_proto.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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/*
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* We only represent one entry for light or proximity. EC is merging different
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* light sensors to return the what the eye would see. For proximity, we
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* currently support only one light source.
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*/
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#define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1)
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/* State data for ec_sensors iio driver. */
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struct cros_ec_light_prox_state {
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/* Shared by all sensors */
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struct cros_ec_sensors_core_state core;
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struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS];
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};
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static int cros_ec_light_prox_read(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
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u16 data = 0;
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s64 val64;
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int ret;
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int idx = chan->scan_index;
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mutex_lock(&st->core.cmd_lock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (chan->type == IIO_PROXIMITY) {
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ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
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(s16 *)&data);
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if (ret)
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break;
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*val = data;
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ret = IIO_VAL_INT;
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} else {
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ret = -EINVAL;
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}
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break;
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case IIO_CHAN_INFO_PROCESSED:
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if (chan->type == IIO_LIGHT) {
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ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
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(s16 *)&data);
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if (ret)
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break;
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/*
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* The data coming from the light sensor is
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* pre-processed and represents the ambient light
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* illuminance reading expressed in lux.
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*/
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*val = data;
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ret = IIO_VAL_INT;
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} else {
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ret = -EINVAL;
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}
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break;
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case IIO_CHAN_INFO_CALIBBIAS:
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
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st->core.param.sensor_offset.flags = 0;
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ret = cros_ec_motion_send_host_cmd(&st->core, 0);
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if (ret)
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break;
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/* Save values */
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st->core.calib[0].offset =
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st->core.resp->sensor_offset.offset[0];
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*val = st->core.calib[idx].offset;
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_CALIBSCALE:
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/*
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* RANGE is used for calibration
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* scale is a number x.y, where x is coded on 16 bits,
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* y coded on 16 bits, between 0 and 9999.
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*/
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
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st->core.param.sensor_range.data = EC_MOTION_SENSE_NO_VALUE;
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ret = cros_ec_motion_send_host_cmd(&st->core, 0);
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if (ret)
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break;
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val64 = st->core.resp->sensor_range.ret;
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*val = val64 >> 16;
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*val2 = (val64 & 0xffff) * 100;
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ret = IIO_VAL_INT_PLUS_MICRO;
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break;
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default:
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ret = cros_ec_sensors_core_read(&st->core, chan, val, val2,
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mask);
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break;
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}
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mutex_unlock(&st->core.cmd_lock);
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return ret;
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}
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static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
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int ret;
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int idx = chan->scan_index;
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mutex_lock(&st->core.cmd_lock);
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switch (mask) {
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case IIO_CHAN_INFO_CALIBBIAS:
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st->core.calib[idx].offset = val;
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/* Send to EC for each axis, even if not complete */
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
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st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET;
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st->core.param.sensor_offset.offset[0] =
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st->core.calib[0].offset;
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st->core.param.sensor_offset.temp =
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EC_MOTION_SENSE_INVALID_CALIB_TEMP;
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ret = cros_ec_motion_send_host_cmd(&st->core, 0);
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break;
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case IIO_CHAN_INFO_CALIBSCALE:
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st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
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st->core.param.sensor_range.data = (val << 16) | (val2 / 100);
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ret = cros_ec_motion_send_host_cmd(&st->core, 0);
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break;
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default:
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ret = cros_ec_sensors_core_write(&st->core, chan, val, val2,
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mask);
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break;
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}
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mutex_unlock(&st->core.cmd_lock);
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return ret;
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}
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static const struct iio_info cros_ec_light_prox_info = {
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.read_raw = &cros_ec_light_prox_read,
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.write_raw = &cros_ec_light_prox_write,
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.read_avail = &cros_ec_sensors_core_read_avail,
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};
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static int cros_ec_light_prox_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct iio_dev *indio_dev;
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struct cros_ec_light_prox_state *state;
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struct iio_chan_spec *channel;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
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if (!indio_dev)
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return -ENOMEM;
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ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
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cros_ec_sensors_capture,
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cros_ec_sensors_push_data);
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if (ret)
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return ret;
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iio_buffer_set_attrs(indio_dev->buffer, cros_ec_sensor_fifo_attributes);
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indio_dev->info = &cros_ec_light_prox_info;
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state = iio_priv(indio_dev);
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state->core.type = state->core.resp->info.type;
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state->core.loc = state->core.resp->info.location;
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channel = state->channels;
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/* Common part */
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channel->info_mask_shared_by_all =
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BIT(IIO_CHAN_INFO_SAMP_FREQ);
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channel->info_mask_shared_by_all_available =
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BIT(IIO_CHAN_INFO_SAMP_FREQ);
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channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
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channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
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channel->scan_type.shift = 0;
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channel->scan_index = 0;
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channel->ext_info = cros_ec_sensors_ext_info;
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channel->scan_type.sign = 'u';
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/* Sensor specific */
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switch (state->core.type) {
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case MOTIONSENSE_TYPE_LIGHT:
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channel->type = IIO_LIGHT;
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channel->info_mask_separate =
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BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_CALIBBIAS) |
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BIT(IIO_CHAN_INFO_CALIBSCALE);
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break;
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case MOTIONSENSE_TYPE_PROX:
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channel->type = IIO_PROXIMITY;
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channel->info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_CALIBBIAS) |
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BIT(IIO_CHAN_INFO_CALIBSCALE);
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break;
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default:
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dev_warn(dev, "Unknown motion sensor\n");
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return -EINVAL;
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}
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/* Timestamp */
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channel++;
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channel->type = IIO_TIMESTAMP;
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channel->channel = -1;
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channel->scan_index = 1;
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channel->scan_type.sign = 's';
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channel->scan_type.realbits = 64;
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channel->scan_type.storagebits = 64;
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indio_dev->channels = state->channels;
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indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS;
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state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
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return devm_iio_device_register(dev, indio_dev);
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}
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static const struct platform_device_id cros_ec_light_prox_ids[] = {
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{
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.name = "cros-ec-prox",
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},
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{
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.name = "cros-ec-light",
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, cros_ec_light_prox_ids);
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static struct platform_driver cros_ec_light_prox_platform_driver = {
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.driver = {
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.name = "cros-ec-light-prox",
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},
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.probe = cros_ec_light_prox_probe,
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.id_table = cros_ec_light_prox_ids,
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};
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module_platform_driver(cros_ec_light_prox_platform_driver);
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MODULE_DESCRIPTION("ChromeOS EC light/proximity sensors driver");
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MODULE_LICENSE("GPL v2");
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