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Release 4.7 drivers/iio/orientation/hid-sensor-rotation.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.
 */

#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/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"


struct dev_rot_state {
	
struct hid_sensor_hub_callbacks callbacks;
	
struct hid_sensor_common common_attributes;
	
struct hid_sensor_hub_attribute_info quaternion;
	
u32 sampled_vals[4];
};

/* Channel definitions */

static const struct iio_chan_spec dev_rot_channels[] = {
	{
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_QUATERNION,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
					BIT(IIO_CHAN_INFO_HYSTERESIS)
	}
};

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

static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan, int size) { chan->scan_type.sign = 's'; /* Real storage bits will change based on the report desc. */ chan->scan_type.realbits = size * 8; /* Maximum size of a sample to capture is u32 */ chan->scan_type.storagebits = sizeof(u32) * 8; chan->scan_type.repeat = 4; }

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/* Channel read_raw handler */
static int dev_rot_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int size, int *vals, int *val_len, long mask) { struct dev_rot_state *rot_state = iio_priv(indio_dev); int ret_type; int i; vals[0] = 0; vals[1] = 0; switch (mask) { case IIO_CHAN_INFO_RAW: if (size >= 4) { for (i = 0; i < 4; ++i) vals[i] = rot_state->sampled_vals[i]; ret_type = IIO_VAL_INT_MULTIPLE; *val_len = 4; } else ret_type = -EINVAL; break; case IIO_CHAN_INFO_SAMP_FREQ: ret_type = hid_sensor_read_samp_freq_value( &rot_state->common_attributes, &vals[0], &vals[1]); break; case IIO_CHAN_INFO_HYSTERESIS: ret_type = hid_sensor_read_raw_hyst_value( &rot_state->common_attributes, &vals[0], &vals[1]); break; default: ret_type = -EINVAL; break; } return ret_type; }

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

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static const struct iio_info dev_rot_info = { .driver_module = THIS_MODULE, .read_raw_multi = &dev_rot_read_raw, .write_raw = &dev_rot_write_raw, }; /* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) { dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n"); iio_push_to_buffers(indio_dev, (u8 *)data); dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n"); }

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/* Callback handler to send event after all samples are received and captured */
static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev, unsigned usage_id, void *priv) { struct iio_dev *indio_dev = platform_get_drvdata(priv); struct dev_rot_state *rot_state = iio_priv(indio_dev); dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n"); if (atomic_read(&rot_state->common_attributes.data_ready)) hid_sensor_push_data(indio_dev, (u8 *)rot_state->sampled_vals, sizeof(rot_state->sampled_vals)); return 0; }

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/* Capture samples in local storage */
static int dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) { memcpy(rot_state->sampled_vals, raw_data, sizeof(rot_state->sampled_vals)); dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len, sizeof(rot_state->sampled_vals)); } return 0; }

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/* Parse report which is specific to an usage id*/
static int dev_rot_parse_report(struct platform_device *pdev, struct hid_sensor_hub_device *hsdev, struct iio_chan_spec *channels, unsigned usage_id, struct dev_rot_state *st) { int ret; ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, usage_id, HID_USAGE_SENSOR_ORIENT_QUATERNION, &st->quaternion); if (ret) return ret; dev_rot_adjust_channel_bit_mask(&channels[0], st->quaternion.size / 4); dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index, st->quaternion.report_id); dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n", st->quaternion.size); /* 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_ORIENTATION, &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 0; }

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/* Function to initialize the processing for usage id */
static int hid_dev_rot_probe(struct platform_device *pdev) { int ret; static char *name = "dev_rotation"; struct iio_dev *indio_dev; struct dev_rot_state *rot_state; struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct dev_rot_state)); if (indio_dev == NULL) return -ENOMEM; platform_set_drvdata(pdev, indio_dev); rot_state = iio_priv(indio_dev); rot_state->common_attributes.hsdev = hsdev; rot_state->common_attributes.pdev = pdev; ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION, &rot_state->common_attributes); if (ret) { dev_err(&pdev->dev, "failed to setup common attributes\n"); return ret; } indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels, sizeof(dev_rot_channels), GFP_KERNEL); if (!indio_dev->channels) { dev_err(&pdev->dev, "failed to duplicate channels\n"); return -ENOMEM; } ret = dev_rot_parse_report(pdev, hsdev, (struct iio_chan_spec *)indio_dev->channels, HID_USAGE_SENSOR_DEVICE_ORIENTATION, rot_state); if (ret) { dev_err(&pdev->dev, "failed to setup attributes\n"); return ret; } indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels); indio_dev->dev.parent = &pdev->dev; indio_dev->info = &dev_rot_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"); return ret; } atomic_set(&rot_state->common_attributes.data_ready, 0); ret = hid_sensor_setup_trigger(indio_dev, name, &rot_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; } rot_state->callbacks.send_event = dev_rot_proc_event; rot_state->callbacks.capture_sample = dev_rot_capture_sample; rot_state->callbacks.pdev = pdev; ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION, &rot_state->callbacks); if (ret) { dev_err(&pdev->dev, "callback reg failed\n"); goto error_iio_unreg; } return 0; error_iio_unreg: iio_device_unregister(indio_dev); error_remove_trigger: hid_sensor_remove_trigger(&rot_state->common_attributes); error_unreg_buffer_funcs: iio_triggered_buffer_cleanup(indio_dev); return ret; }

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Total446100.00%3100.00%

/* Function to deinitialize the processing for usage id */
static int hid_dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION); iio_device_unregister(indio_dev); hid_sensor_remove_trigger(&rot_state->common_attributes); iio_triggered_buffer_cleanup(indio_dev); return 0; }

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static const struct platform_device_id hid_dev_rot_ids[] = { { /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ .name = "HID-SENSOR-20008a", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids); static struct platform_driver hid_dev_rot_platform_driver = { .id_table = hid_dev_rot_ids, .driver = { .name = KBUILD_MODNAME, }, .probe = hid_dev_rot_probe, .remove = hid_dev_rot_remove, }; module_platform_driver(hid_dev_rot_platform_driver); MODULE_DESCRIPTION("HID Sensor Device Rotation"); MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); MODULE_LICENSE("GPL");

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krzysztof kozlowskikrzysztof kozlowski10.07%125.00%
Total1466100.00%4100.00%
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