cregit-Linux how code gets into the kernel

Release 4.8 drivers/iio/light/hid-sensor-prox.c

/*
 * HID Sensors Driver
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.
 *
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"


#define CHANNEL_SCAN_INDEX_PRESENCE 0


struct prox_state {
	
struct hid_sensor_hub_callbacks callbacks;
	
struct hid_sensor_common common_attributes;
	
struct hid_sensor_hub_attribute_info prox_attr;
	
u32 human_presence;
};

/* Channel definitions */

static const struct iio_chan_spec prox_channels[] = {
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
		BIT(IIO_CHAN_INFO_SCALE) |
		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
		BIT(IIO_CHAN_INFO_HYSTERESIS),
		.scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
        }
};

/* Adjust channel real bits based on report descriptor */

static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, int channel, int size) { channels[channel].scan_type.sign = 's'; /* Real storage bits will change based on the report desc. */ channels[channel].scan_type.realbits = size * 8; /* Maximum size of a sample to capture is u32 */ channels[channel].scan_type.storagebits = sizeof(u32) * 8; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni59100.00%1100.00%
Total59100.00%1100.00%

/* Channel read_raw handler */
static int prox_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct prox_state *prox_state = iio_priv(indio_dev); int report_id = -1; u32 address; int ret_type; *val = 0; *val2 = 0; switch (mask) { case IIO_CHAN_INFO_RAW: switch (chan->scan_index) { case CHANNEL_SCAN_INDEX_PRESENCE: report_id = prox_state->prox_attr.report_id; address = HID_USAGE_SENSOR_HUMAN_PRESENCE; break; default: report_id = -1; break; } if (report_id >= 0) { hid_sensor_power_state(&prox_state->common_attributes, true); *val = sensor_hub_input_attr_get_raw_value( prox_state->common_attributes.hsdev, HID_USAGE_SENSOR_PROX, address, report_id, SENSOR_HUB_SYNC); hid_sensor_power_state(&prox_state->common_attributes, false); } else { *val = 0; return -EINVAL; } ret_type = IIO_VAL_INT; break; case IIO_CHAN_INFO_SCALE: *val = prox_state->prox_attr.units; ret_type = IIO_VAL_INT; break; case IIO_CHAN_INFO_OFFSET: *val = hid_sensor_convert_exponent( prox_state->prox_attr.unit_expo); ret_type = IIO_VAL_INT; break; case IIO_CHAN_INFO_SAMP_FREQ: ret_type = hid_sensor_read_samp_freq_value( &prox_state->common_attributes, val, val2); break; case IIO_CHAN_INFO_HYSTERESIS: ret_type = hid_sensor_read_raw_hyst_value( &prox_state->common_attributes, val, val2); break; default: ret_type = -EINVAL; break; } return ret_type; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni22289.52%125.00%
srinivas pandruvadasrinivas pandruvada249.68%250.00%
sachin kamatsachin kamat20.81%125.00%
Total248100.00%4100.00%

/* Channel write_raw handler */
static int prox_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct prox_state *prox_state = iio_priv(indio_dev); int ret = 0; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: ret = hid_sensor_write_samp_freq_value( &prox_state->common_attributes, val, val2); break; case IIO_CHAN_INFO_HYSTERESIS: ret = hid_sensor_write_raw_hyst_value( &prox_state->common_attributes, val, val2); break; default: ret = -EINVAL; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni92100.00%1100.00%
Total92100.00%1100.00%

static const struct iio_info prox_info = { .driver_module = THIS_MODULE, .read_raw = &prox_read_raw, .write_raw = &prox_write_raw, }; /* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, int len) { dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); iio_push_to_buffers(indio_dev, data); }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni36100.00%1100.00%
Total36100.00%1100.00%

/* Callback handler to send event after all samples are received and captured */
static int prox_proc_event(struct hid_sensor_hub_device *hsdev, unsigned usage_id, void *priv) { struct iio_dev *indio_dev = platform_get_drvdata(priv); struct prox_state *prox_state = iio_priv(indio_dev); dev_dbg(&indio_dev->dev, "prox_proc_event\n"); if (atomic_read(&prox_state->common_attributes.data_ready)) hid_sensor_push_data(indio_dev, &prox_state->human_presence, sizeof(prox_state->human_presence)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni7593.75%150.00%
srinivas pandruvadasrinivas pandruvada56.25%150.00%
Total80100.00%2100.00%

/* Capture samples in local storage */
static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, unsigned usage_id, size_t raw_len, char *raw_data, void *priv) { struct iio_dev *indio_dev = platform_get_drvdata(priv); struct prox_state *prox_state = iio_priv(indio_dev); int ret = -EINVAL; switch (usage_id) { case HID_USAGE_SENSOR_HUMAN_PRESENCE: prox_state->human_presence = *(u32 *)raw_data; ret = 0; break; default: break; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni81100.00%1100.00%
Total81100.00%1100.00%

/* Parse report which is specific to an usage id*/
static int prox_parse_report(struct platform_device *pdev, struct hid_sensor_hub_device *hsdev, struct iio_chan_spec *channels, unsigned usage_id, struct prox_state *st) { int ret; ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, usage_id, HID_USAGE_SENSOR_HUMAN_PRESENCE, &st->prox_attr); if (ret < 0) return ret; prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, st->prox_attr.size); dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, st->prox_attr.report_id); /* Set Sensitivity field ids, when there is no individual modifier */ if (st->common_attributes.sensitivity.index < 0) { sensor_hub_input_get_attribute_info(hsdev, HID_FEATURE_REPORT, usage_id, HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | HID_USAGE_SENSOR_DATA_PRESENCE, &st->common_attributes.sensitivity); dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", st->common_attributes.sensitivity.index, st->common_attributes.sensitivity.report_id); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni158100.00%1100.00%
Total158100.00%1100.00%

/* Function to initialize the processing for usage id */
static int hid_prox_probe(struct platform_device *pdev) { int ret = 0; static const char *name = "prox"; struct iio_dev *indio_dev; struct prox_state *prox_state; struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct prox_state)); if (!indio_dev) return -ENOMEM; platform_set_drvdata(pdev, indio_dev); prox_state = iio_priv(indio_dev); prox_state->common_attributes.hsdev = hsdev; prox_state->common_attributes.pdev = pdev; ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, &prox_state->common_attributes); if (ret) { dev_err(&pdev->dev, "failed to setup common attributes\n"); return ret; } indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels), GFP_KERNEL); if (!indio_dev->channels) { dev_err(&pdev->dev, "failed to duplicate channels\n"); return -ENOMEM; } ret = prox_parse_report(pdev, hsdev, (struct iio_chan_spec *)indio_dev->channels, HID_USAGE_SENSOR_PROX, prox_state); if (ret) { dev_err(&pdev->dev, "failed to setup attributes\n"); goto error_free_dev_mem; } indio_dev->num_channels = ARRAY_SIZE(prox_channels); indio_dev->dev.parent = &pdev->dev; indio_dev->info = &prox_info; indio_dev->name = name; indio_dev->modes = INDIO_DIRECT_MODE; ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, NULL, NULL); if (ret) { dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); goto error_free_dev_mem; } atomic_set(&prox_state->common_attributes.data_ready, 0); ret = hid_sensor_setup_trigger(indio_dev, name, &prox_state->common_attributes); if (ret) { dev_err(&pdev->dev, "trigger setup failed\n"); goto error_unreg_buffer_funcs; } ret = iio_device_register(indio_dev); if (ret) { dev_err(&pdev->dev, "device register failed\n"); goto error_remove_trigger; } prox_state->callbacks.send_event = prox_proc_event; prox_state->callbacks.capture_sample = prox_capture_sample; prox_state->callbacks.pdev = pdev; ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, &prox_state->callbacks); if (ret < 0) { dev_err(&pdev->dev, "callback reg failed\n"); goto error_iio_unreg; } return ret; error_iio_unreg: iio_device_unregister(indio_dev); error_remove_trigger: hid_sensor_remove_trigger(&prox_state->common_attributes); error_unreg_buffer_funcs: iio_triggered_buffer_cleanup(indio_dev); error_free_dev_mem: kfree(indio_dev->channels); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni43796.26%133.33%
fabio estevamfabio estevam112.42%133.33%
srinivas pandruvadasrinivas pandruvada61.32%133.33%
Total454100.00%3100.00%

/* Function to deinitialize the processing for usage id */
static int hid_prox_remove(struct platform_device *pdev) { struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; struct iio_dev *indio_dev = platform_get_drvdata(pdev); struct prox_state *prox_state = iio_priv(indio_dev); sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); iio_device_unregister(indio_dev); hid_sensor_remove_trigger(&prox_state->common_attributes); iio_triggered_buffer_cleanup(indio_dev); kfree(indio_dev->channels); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni77100.00%1100.00%
Total77100.00%1100.00%

static const struct platform_device_id hid_prox_ids[] = { { /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ .name = "HID-SENSOR-200011", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, hid_prox_ids); static struct platform_driver hid_prox_platform_driver = { .id_table = hid_prox_ids, .driver = { .name = KBUILD_MODNAME, .pm = &hid_sensor_pm_ops, }, .probe = hid_prox_probe, .remove = hid_prox_remove, }; module_platform_driver(hid_prox_platform_driver); MODULE_DESCRIPTION("HID Sensor Proximity"); MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
archana patniarchana patni146796.20%112.50%
srinivas pandruvadasrinivas pandruvada442.89%450.00%
fabio estevamfabio estevam110.72%112.50%
sachin kamatsachin kamat20.13%112.50%
krzysztof kozlowskikrzysztof kozlowski10.07%112.50%
Total1525100.00%8100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.