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alistair23-linux/drivers/iio/accel/hid-sensor-accel-3d.c
Thomas Gleixner a61127c213 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 
Based on 1 normalized pattern(s):

  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 if not write to the free
  software foundation inc 51 franklin st fifth floor boston ma 02110
  1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 111 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.567572064@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* HID Sensors Driver
* Copyright (c) 2012, Intel Corporation.
*/
#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"
enum accel_3d_channel {
CHANNEL_SCAN_INDEX_X,
CHANNEL_SCAN_INDEX_Y,
CHANNEL_SCAN_INDEX_Z,
ACCEL_3D_CHANNEL_MAX,
};
struct accel_3d_state {
struct hid_sensor_hub_callbacks callbacks;
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
/* Reserve for 3 channels + padding + timestamp */
u32 accel_val[ACCEL_3D_CHANNEL_MAX + 3];
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
int64_t timestamp;
};
static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
HID_USAGE_SENSOR_ACCEL_X_AXIS,
HID_USAGE_SENSOR_ACCEL_Y_AXIS,
HID_USAGE_SENSOR_ACCEL_Z_AXIS
};
/* Channel definitions */
static const struct iio_chan_spec accel_3d_channels[] = {
{
.type = IIO_ACCEL,
.modified = 1,
.channel2 = IIO_MOD_X,
.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_X,
}, {
.type = IIO_ACCEL,
.modified = 1,
.channel2 = IIO_MOD_Y,
.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_Y,
}, {
.type = IIO_ACCEL,
.modified = 1,
.channel2 = IIO_MOD_Z,
.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_Z,
},
IIO_CHAN_SOFT_TIMESTAMP(3)
};
/* Channel definitions */
static const struct iio_chan_spec gravity_channels[] = {
{
.type = IIO_GRAVITY,
.modified = 1,
.channel2 = IIO_MOD_X,
.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_X,
}, {
.type = IIO_GRAVITY,
.modified = 1,
.channel2 = IIO_MOD_Y,
.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_Y,
}, {
.type = IIO_GRAVITY,
.modified = 1,
.channel2 = IIO_MOD_Z,
.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_Z,
}
};
/* Adjust channel real bits based on report descriptor */
static void accel_3d_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;
}
/* Channel read_raw handler */
static int accel_3d_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
struct accel_3d_state *accel_state = iio_priv(indio_dev);
int report_id = -1;
u32 address;
int ret_type;
s32 min;
struct hid_sensor_hub_device *hsdev =
accel_state->common_attributes.hsdev;
*val = 0;
*val2 = 0;
switch (mask) {
case IIO_CHAN_INFO_RAW:
hid_sensor_power_state(&accel_state->common_attributes, true);
report_id = accel_state->accel[chan->scan_index].report_id;
min = accel_state->accel[chan->scan_index].logical_minimum;
address = accel_3d_addresses[chan->scan_index];
if (report_id >= 0)
*val = sensor_hub_input_attr_get_raw_value(
accel_state->common_attributes.hsdev,
hsdev->usage, address, report_id,
SENSOR_HUB_SYNC,
min < 0);
else {
*val = 0;
hid_sensor_power_state(&accel_state->common_attributes,
false);
return -EINVAL;
}
hid_sensor_power_state(&accel_state->common_attributes, false);
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = accel_state->scale_pre_decml;
*val2 = accel_state->scale_post_decml;
ret_type = accel_state->scale_precision;
break;
case IIO_CHAN_INFO_OFFSET:
*val = accel_state->value_offset;
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
ret_type = hid_sensor_read_samp_freq_value(
&accel_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret_type = hid_sensor_read_raw_hyst_value(
&accel_state->common_attributes, val, val2);
break;
default:
ret_type = -EINVAL;
break;
}
return ret_type;
}
/* Channel write_raw handler */
static int accel_3d_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct accel_3d_state *accel_state = iio_priv(indio_dev);
int ret = 0;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
ret = hid_sensor_write_samp_freq_value(
&accel_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret = hid_sensor_write_raw_hyst_value(
&accel_state->common_attributes, val, val2);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct iio_info accel_3d_info = {
.read_raw = &accel_3d_read_raw,
.write_raw = &accel_3d_write_raw,
};
/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, void *data,
int len, int64_t timestamp)
{
dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
iio_push_to_buffers_with_timestamp(indio_dev, data, timestamp);
}
/* Callback handler to send event after all samples are received and captured */
static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
void *priv)
{
struct iio_dev *indio_dev = platform_get_drvdata(priv);
struct accel_3d_state *accel_state = iio_priv(indio_dev);
dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
if (atomic_read(&accel_state->common_attributes.data_ready)) {
if (!accel_state->timestamp)
accel_state->timestamp = iio_get_time_ns(indio_dev);
hid_sensor_push_data(indio_dev,
accel_state->accel_val,
sizeof(accel_state->accel_val),
accel_state->timestamp);
accel_state->timestamp = 0;
}
return 0;
}
/* Capture samples in local storage */
static int accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev);
int offset;
int ret = -EINVAL;
switch (usage_id) {
case HID_USAGE_SENSOR_ACCEL_X_AXIS:
case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
*(u32 *)raw_data;
ret = 0;
break;
case HID_USAGE_SENSOR_TIME_TIMESTAMP:
accel_state->timestamp =
hid_sensor_convert_timestamp(
&accel_state->common_attributes,
*(int64_t *)raw_data);
break;
default:
break;
}
return ret;
}
/* Parse report which is specific to an usage id*/
static int accel_3d_parse_report(struct platform_device *pdev,
struct hid_sensor_hub_device *hsdev,
struct iio_chan_spec *channels,
unsigned usage_id,
struct accel_3d_state *st)
{
int ret;
int i;
for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
ret = sensor_hub_input_get_attribute_info(hsdev,
HID_INPUT_REPORT,
usage_id,
HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
&st->accel[CHANNEL_SCAN_INDEX_X + i]);
if (ret < 0)
break;
accel_3d_adjust_channel_bit_mask(channels,
CHANNEL_SCAN_INDEX_X + i,
st->accel[CHANNEL_SCAN_INDEX_X + i].size);
}
dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
st->accel[0].index,
st->accel[0].report_id,
st->accel[1].index, st->accel[1].report_id,
st->accel[2].index, st->accel[2].report_id);
st->scale_precision = hid_sensor_format_scale(
hsdev->usage,
&st->accel[CHANNEL_SCAN_INDEX_X],
&st->scale_pre_decml, &st->scale_post_decml);
/* 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_ACCELERATION,
&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;
}
/* Function to initialize the processing for usage id */
static int hid_accel_3d_probe(struct platform_device *pdev)
{
int ret = 0;
const char *name;
struct iio_dev *indio_dev;
struct accel_3d_state *accel_state;
const struct iio_chan_spec *channel_spec;
int channel_size;
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
indio_dev = devm_iio_device_alloc(&pdev->dev,
sizeof(struct accel_3d_state));
if (indio_dev == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, indio_dev);
accel_state = iio_priv(indio_dev);
accel_state->common_attributes.hsdev = hsdev;
accel_state->common_attributes.pdev = pdev;
if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) {
name = "accel_3d";
channel_spec = accel_3d_channels;
channel_size = sizeof(accel_3d_channels);
indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
} else {
name = "gravity";
channel_spec = gravity_channels;
channel_size = sizeof(gravity_channels);
indio_dev->num_channels = ARRAY_SIZE(gravity_channels);
}
ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
&accel_state->common_attributes);
if (ret) {
dev_err(&pdev->dev, "failed to setup common attributes\n");
return ret;
}
indio_dev->channels = kmemdup(channel_spec, channel_size, GFP_KERNEL);
if (!indio_dev->channels) {
dev_err(&pdev->dev, "failed to duplicate channels\n");
return -ENOMEM;
}
ret = accel_3d_parse_report(pdev, hsdev,
(struct iio_chan_spec *)indio_dev->channels,
hsdev->usage, accel_state);
if (ret) {
dev_err(&pdev->dev, "failed to setup attributes\n");
goto error_free_dev_mem;
}
indio_dev->dev.parent = &pdev->dev;
indio_dev->info = &accel_3d_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(&accel_state->common_attributes.data_ready, 0);
ret = hid_sensor_setup_trigger(indio_dev, name,
&accel_state->common_attributes);
if (ret < 0) {
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;
}
accel_state->callbacks.send_event = accel_3d_proc_event;
accel_state->callbacks.capture_sample = accel_3d_capture_sample;
accel_state->callbacks.pdev = pdev;
ret = sensor_hub_register_callback(hsdev, hsdev->usage,
&accel_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(&accel_state->common_attributes);
error_unreg_buffer_funcs:
iio_triggered_buffer_cleanup(indio_dev);
error_free_dev_mem:
kfree(indio_dev->channels);
return ret;
}
/* Function to deinitialize the processing for usage id */
static int hid_accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev);
sensor_hub_remove_callback(hsdev, hsdev->usage);
iio_device_unregister(indio_dev);
hid_sensor_remove_trigger(&accel_state->common_attributes);
iio_triggered_buffer_cleanup(indio_dev);
kfree(indio_dev->channels);
return 0;
}
static const struct platform_device_id hid_accel_3d_ids[] = {
{
/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
.name = "HID-SENSOR-200073",
},
{ /* gravity sensor */
.name = "HID-SENSOR-20007b",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
static struct platform_driver hid_accel_3d_platform_driver = {
.id_table = hid_accel_3d_ids,
.driver = {
.name = KBUILD_MODNAME,
.pm = &hid_sensor_pm_ops,
},
.probe = hid_accel_3d_probe,
.remove = hid_accel_3d_remove,
};
module_platform_driver(hid_accel_3d_platform_driver);
MODULE_DESCRIPTION("HID Sensor Accel 3D");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");
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