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![Kweh, Hock Leong](/assets/img/avatar_default.png)
There is one light sensor type defined in the sensor hub specification, which has one Illuminance field. It doesn't distinguish between ambient light sensor or color sensor. Currently it is presented as IIO_INTENSITY channel. There are some user spaces specifically looking for IIO_LIGHT channel. To satisfy such user spaces this change also add a duplicate IIO_LIGHT channel. The units of measurement of Illuminance field is Lux, so it is still compatible to IIO ABI. Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@intel.com> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
404 lines
11 KiB
C
404 lines
11 KiB
C
/*
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* HID Sensors Driver
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* Copyright (c) 2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/hid-sensor-hub.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include "../common/hid-sensors/hid-sensor-trigger.h"
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enum {
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CHANNEL_SCAN_INDEX_INTENSITY = 0,
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CHANNEL_SCAN_INDEX_ILLUM = 1,
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CHANNEL_SCAN_INDEX_MAX
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};
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struct als_state {
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struct hid_sensor_hub_callbacks callbacks;
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struct hid_sensor_common common_attributes;
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struct hid_sensor_hub_attribute_info als_illum;
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u32 illum[CHANNEL_SCAN_INDEX_MAX];
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int scale_pre_decml;
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int scale_post_decml;
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int scale_precision;
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int value_offset;
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};
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/* Channel definitions */
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static const struct iio_chan_spec als_channels[] = {
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{
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.type = IIO_INTENSITY,
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.modified = 1,
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.channel2 = IIO_MOD_LIGHT_BOTH,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_HYSTERESIS),
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.scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
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},
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_HYSTERESIS),
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.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
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}
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};
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/* Adjust channel real bits based on report descriptor */
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static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
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int channel, int size)
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{
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channels[channel].scan_type.sign = 's';
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/* Real storage bits will change based on the report desc. */
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channels[channel].scan_type.realbits = size * 8;
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/* Maximum size of a sample to capture is u32 */
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channels[channel].scan_type.storagebits = sizeof(u32) * 8;
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}
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/* Channel read_raw handler */
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static int als_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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{
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struct als_state *als_state = iio_priv(indio_dev);
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int report_id = -1;
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u32 address;
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int ret_type;
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*val = 0;
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*val2 = 0;
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switch (mask) {
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case 0:
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switch (chan->scan_index) {
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case CHANNEL_SCAN_INDEX_INTENSITY:
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case CHANNEL_SCAN_INDEX_ILLUM:
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report_id = als_state->als_illum.report_id;
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address =
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HID_USAGE_SENSOR_LIGHT_ILLUM;
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break;
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default:
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report_id = -1;
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break;
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}
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if (report_id >= 0) {
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hid_sensor_power_state(&als_state->common_attributes,
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true);
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*val = sensor_hub_input_attr_get_raw_value(
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als_state->common_attributes.hsdev,
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HID_USAGE_SENSOR_ALS, address,
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report_id,
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SENSOR_HUB_SYNC);
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hid_sensor_power_state(&als_state->common_attributes,
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false);
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} else {
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*val = 0;
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return -EINVAL;
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}
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ret_type = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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*val = als_state->scale_pre_decml;
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*val2 = als_state->scale_post_decml;
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ret_type = als_state->scale_precision;
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break;
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case IIO_CHAN_INFO_OFFSET:
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*val = als_state->value_offset;
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ret_type = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret_type = hid_sensor_read_samp_freq_value(
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&als_state->common_attributes, val, val2);
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break;
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case IIO_CHAN_INFO_HYSTERESIS:
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ret_type = hid_sensor_read_raw_hyst_value(
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&als_state->common_attributes, val, val2);
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break;
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default:
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ret_type = -EINVAL;
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break;
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}
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return ret_type;
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}
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/* Channel write_raw handler */
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static int als_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct als_state *als_state = iio_priv(indio_dev);
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int ret = 0;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = hid_sensor_write_samp_freq_value(
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&als_state->common_attributes, val, val2);
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break;
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case IIO_CHAN_INFO_HYSTERESIS:
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ret = hid_sensor_write_raw_hyst_value(
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&als_state->common_attributes, val, val2);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static const struct iio_info als_info = {
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.driver_module = THIS_MODULE,
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.read_raw = &als_read_raw,
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.write_raw = &als_write_raw,
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};
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/* Function to push data to buffer */
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static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
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int len)
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{
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dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
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iio_push_to_buffers(indio_dev, data);
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}
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/* Callback handler to send event after all samples are received and captured */
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static int als_proc_event(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id,
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void *priv)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(priv);
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struct als_state *als_state = iio_priv(indio_dev);
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dev_dbg(&indio_dev->dev, "als_proc_event\n");
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if (atomic_read(&als_state->common_attributes.data_ready))
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hid_sensor_push_data(indio_dev,
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&als_state->illum,
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sizeof(als_state->illum));
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return 0;
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}
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/* Capture samples in local storage */
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static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id,
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size_t raw_len, char *raw_data,
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void *priv)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(priv);
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struct als_state *als_state = iio_priv(indio_dev);
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int ret = -EINVAL;
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u32 sample_data = *(u32 *)raw_data;
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switch (usage_id) {
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case HID_USAGE_SENSOR_LIGHT_ILLUM:
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als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
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als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
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ret = 0;
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break;
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default:
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break;
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}
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return ret;
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}
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/* Parse report which is specific to an usage id*/
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static int als_parse_report(struct platform_device *pdev,
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struct hid_sensor_hub_device *hsdev,
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struct iio_chan_spec *channels,
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unsigned usage_id,
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struct als_state *st)
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{
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int ret;
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ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
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usage_id,
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HID_USAGE_SENSOR_LIGHT_ILLUM,
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&st->als_illum);
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if (ret < 0)
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return ret;
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als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY,
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st->als_illum.size);
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als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
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st->als_illum.size);
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dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
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st->als_illum.report_id);
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st->scale_precision = hid_sensor_format_scale(
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HID_USAGE_SENSOR_ALS,
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&st->als_illum,
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&st->scale_pre_decml, &st->scale_post_decml);
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/* Set Sensitivity field ids, when there is no individual modifier */
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if (st->common_attributes.sensitivity.index < 0) {
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sensor_hub_input_get_attribute_info(hsdev,
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HID_FEATURE_REPORT, usage_id,
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HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
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HID_USAGE_SENSOR_DATA_LIGHT,
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&st->common_attributes.sensitivity);
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dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
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st->common_attributes.sensitivity.index,
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st->common_attributes.sensitivity.report_id);
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}
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return ret;
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}
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/* Function to initialize the processing for usage id */
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static int hid_als_probe(struct platform_device *pdev)
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{
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int ret = 0;
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static const char *name = "als";
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struct iio_dev *indio_dev;
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struct als_state *als_state;
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
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if (!indio_dev)
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return -ENOMEM;
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platform_set_drvdata(pdev, indio_dev);
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als_state = iio_priv(indio_dev);
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als_state->common_attributes.hsdev = hsdev;
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als_state->common_attributes.pdev = pdev;
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ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
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&als_state->common_attributes);
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if (ret) {
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dev_err(&pdev->dev, "failed to setup common attributes\n");
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return ret;
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}
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indio_dev->channels = kmemdup(als_channels,
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sizeof(als_channels), GFP_KERNEL);
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if (!indio_dev->channels) {
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dev_err(&pdev->dev, "failed to duplicate channels\n");
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return -ENOMEM;
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}
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ret = als_parse_report(pdev, hsdev,
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(struct iio_chan_spec *)indio_dev->channels,
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HID_USAGE_SENSOR_ALS, als_state);
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if (ret) {
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dev_err(&pdev->dev, "failed to setup attributes\n");
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goto error_free_dev_mem;
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}
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indio_dev->num_channels =
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ARRAY_SIZE(als_channels);
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indio_dev->dev.parent = &pdev->dev;
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indio_dev->info = &als_info;
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indio_dev->name = name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
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NULL, NULL);
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if (ret) {
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dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
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goto error_free_dev_mem;
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}
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atomic_set(&als_state->common_attributes.data_ready, 0);
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ret = hid_sensor_setup_trigger(indio_dev, name,
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&als_state->common_attributes);
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if (ret < 0) {
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dev_err(&pdev->dev, "trigger setup failed\n");
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goto error_unreg_buffer_funcs;
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}
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(&pdev->dev, "device register failed\n");
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goto error_remove_trigger;
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}
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als_state->callbacks.send_event = als_proc_event;
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als_state->callbacks.capture_sample = als_capture_sample;
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als_state->callbacks.pdev = pdev;
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ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
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&als_state->callbacks);
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if (ret < 0) {
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dev_err(&pdev->dev, "callback reg failed\n");
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goto error_iio_unreg;
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}
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return ret;
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error_iio_unreg:
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iio_device_unregister(indio_dev);
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error_remove_trigger:
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hid_sensor_remove_trigger(&als_state->common_attributes);
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error_unreg_buffer_funcs:
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iio_triggered_buffer_cleanup(indio_dev);
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error_free_dev_mem:
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kfree(indio_dev->channels);
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return ret;
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}
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/* Function to deinitialize the processing for usage id */
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static int hid_als_remove(struct platform_device *pdev)
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{
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct als_state *als_state = iio_priv(indio_dev);
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
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iio_device_unregister(indio_dev);
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hid_sensor_remove_trigger(&als_state->common_attributes);
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iio_triggered_buffer_cleanup(indio_dev);
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kfree(indio_dev->channels);
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return 0;
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}
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static const struct platform_device_id hid_als_ids[] = {
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{
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
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.name = "HID-SENSOR-200041",
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, hid_als_ids);
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static struct platform_driver hid_als_platform_driver = {
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.id_table = hid_als_ids,
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.driver = {
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.name = KBUILD_MODNAME,
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.pm = &hid_sensor_pm_ops,
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},
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.probe = hid_als_probe,
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.remove = hid_als_remove,
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};
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module_platform_driver(hid_als_platform_driver);
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MODULE_DESCRIPTION("HID Sensor ALS");
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MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
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MODULE_LICENSE("GPL");
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