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379 lines
10 KiB
379 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HID Sensors Driver |
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* Copyright (c) 2014, Intel Corporation. |
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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/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 "../common/hid-sensors/hid-sensor-trigger.h" |
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struct dev_rot_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 quaternion; |
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struct { |
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s32 sampled_vals[4] __aligned(16); |
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u64 timestamp __aligned(8); |
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} scan; |
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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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s64 timestamp; |
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}; |
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/* Channel definitions */ |
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static const struct iio_chan_spec dev_rot_channels[] = { |
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{ |
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.type = IIO_ROT, |
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.modified = 1, |
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.channel2 = IIO_MOD_QUATERNION, |
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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_SAMP_FREQ) | |
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BIT(IIO_CHAN_INFO_OFFSET) | |
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BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_HYSTERESIS), |
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.scan_index = 0 |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(1) |
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}; |
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/* Adjust channel real bits based on report descriptor */ |
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static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan, |
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int size) |
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{ |
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chan->scan_type.sign = 's'; |
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/* Real storage bits will change based on the report desc. */ |
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chan->scan_type.realbits = size * 8; |
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/* Maximum size of a sample to capture is u32 */ |
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chan->scan_type.storagebits = sizeof(u32) * 8; |
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chan->scan_type.repeat = 4; |
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} |
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/* Channel read_raw handler */ |
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static int dev_rot_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int size, int *vals, int *val_len, |
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long mask) |
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{ |
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struct dev_rot_state *rot_state = iio_priv(indio_dev); |
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int ret_type; |
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int i; |
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vals[0] = 0; |
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vals[1] = 0; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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if (size >= 4) { |
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for (i = 0; i < 4; ++i) |
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vals[i] = rot_state->scan.sampled_vals[i]; |
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ret_type = IIO_VAL_INT_MULTIPLE; |
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*val_len = 4; |
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} else |
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ret_type = -EINVAL; |
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break; |
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case IIO_CHAN_INFO_SCALE: |
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vals[0] = rot_state->scale_pre_decml; |
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vals[1] = rot_state->scale_post_decml; |
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return rot_state->scale_precision; |
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case IIO_CHAN_INFO_OFFSET: |
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*vals = rot_state->value_offset; |
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return IIO_VAL_INT; |
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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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&rot_state->common_attributes, &vals[0], &vals[1]); |
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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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&rot_state->common_attributes, &vals[0], &vals[1]); |
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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 dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); |
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int ret; |
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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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&rot_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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&rot_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 dev_rot_info = { |
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.read_raw_multi = &dev_rot_read_raw, |
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.write_raw = &dev_rot_write_raw, |
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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 dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); |
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dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n"); |
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if (atomic_read(&rot_state->common_attributes.data_ready)) { |
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if (!rot_state->timestamp) |
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rot_state->timestamp = iio_get_time_ns(indio_dev); |
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iio_push_to_buffers_with_timestamp(indio_dev, &rot_state->scan, |
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rot_state->timestamp); |
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rot_state->timestamp = 0; |
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} |
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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 dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); |
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if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) { |
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if (raw_len / 4 == sizeof(s16)) { |
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rot_state->scan.sampled_vals[0] = ((s16 *)raw_data)[0]; |
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rot_state->scan.sampled_vals[1] = ((s16 *)raw_data)[1]; |
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rot_state->scan.sampled_vals[2] = ((s16 *)raw_data)[2]; |
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rot_state->scan.sampled_vals[3] = ((s16 *)raw_data)[3]; |
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} else { |
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memcpy(&rot_state->scan.sampled_vals, raw_data, |
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sizeof(rot_state->scan.sampled_vals)); |
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} |
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dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len, |
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sizeof(rot_state->scan.sampled_vals)); |
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} else if (usage_id == HID_USAGE_SENSOR_TIME_TIMESTAMP) { |
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rot_state->timestamp = hid_sensor_convert_timestamp(&rot_state->common_attributes, |
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*(s64 *)raw_data); |
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} |
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return 0; |
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} |
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/* Parse report which is specific to an usage id*/ |
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static int dev_rot_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 dev_rot_state *st) |
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{ |
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int ret; |
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ret = sensor_hub_input_get_attribute_info(hsdev, |
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HID_INPUT_REPORT, |
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usage_id, |
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HID_USAGE_SENSOR_ORIENT_QUATERNION, |
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&st->quaternion); |
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if (ret) |
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return ret; |
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dev_rot_adjust_channel_bit_mask(&channels[0], |
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st->quaternion.size / 4); |
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dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index, |
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st->quaternion.report_id); |
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dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n", |
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st->quaternion.size); |
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st->scale_precision = hid_sensor_format_scale( |
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hsdev->usage, |
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&st->quaternion, |
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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_ORIENTATION, |
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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 0; |
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} |
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/* Function to initialize the processing for usage id */ |
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static int hid_dev_rot_probe(struct platform_device *pdev) |
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{ |
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int ret; |
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char *name; |
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struct iio_dev *indio_dev; |
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struct dev_rot_state *rot_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, |
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sizeof(struct dev_rot_state)); |
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if (indio_dev == NULL) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, indio_dev); |
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rot_state = iio_priv(indio_dev); |
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rot_state->common_attributes.hsdev = hsdev; |
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rot_state->common_attributes.pdev = pdev; |
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switch (hsdev->usage) { |
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case HID_USAGE_SENSOR_DEVICE_ORIENTATION: |
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name = "dev_rotation"; |
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break; |
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case HID_USAGE_SENSOR_RELATIVE_ORIENTATION: |
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name = "relative_orientation"; |
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break; |
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case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION: |
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name = "geomagnetic_orientation"; |
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break; |
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default: |
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return -EINVAL; |
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} |
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ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, |
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&rot_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 = devm_kmemdup(&pdev->dev, dev_rot_channels, |
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sizeof(dev_rot_channels), |
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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 = dev_rot_parse_report(pdev, hsdev, |
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(struct iio_chan_spec *)indio_dev->channels, |
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hsdev->usage, rot_state); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to setup attributes\n"); |
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return ret; |
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} |
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indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels); |
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indio_dev->info = &dev_rot_info; |
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indio_dev->name = name; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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atomic_set(&rot_state->common_attributes.data_ready, 0); |
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ret = hid_sensor_setup_trigger(indio_dev, name, |
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&rot_state->common_attributes); |
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if (ret) { |
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dev_err(&pdev->dev, "trigger setup failed\n"); |
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return ret; |
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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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rot_state->callbacks.send_event = dev_rot_proc_event; |
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rot_state->callbacks.capture_sample = dev_rot_capture_sample; |
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rot_state->callbacks.pdev = pdev; |
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ret = sensor_hub_register_callback(hsdev, hsdev->usage, |
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&rot_state->callbacks); |
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if (ret) { |
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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 0; |
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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(indio_dev, &rot_state->common_attributes); |
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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_dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev); |
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sensor_hub_remove_callback(hsdev, hsdev->usage); |
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iio_device_unregister(indio_dev); |
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hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes); |
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return 0; |
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} |
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static const struct platform_device_id hid_dev_rot_ids[] = { |
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{ |
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */ |
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.name = "HID-SENSOR-20008a", |
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}, |
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{ |
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/* Relative orientation(AG) sensor */ |
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.name = "HID-SENSOR-20008e", |
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}, |
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{ |
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/* Geomagnetic orientation(AM) sensor */ |
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.name = "HID-SENSOR-2000c1", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids); |
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static struct platform_driver hid_dev_rot_platform_driver = { |
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.id_table = hid_dev_rot_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_dev_rot_probe, |
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.remove = hid_dev_rot_remove, |
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}; |
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module_platform_driver(hid_dev_rot_platform_driver); |
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MODULE_DESCRIPTION("HID Sensor Device Rotation"); |
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MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>"); |
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MODULE_LICENSE("GPL");
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