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469 lines
13 KiB
469 lines
13 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) 2012, 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/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 "../common/hid-sensors/hid-sensor-trigger.h" |
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|
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enum accel_3d_channel { |
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CHANNEL_SCAN_INDEX_X, |
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CHANNEL_SCAN_INDEX_Y, |
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CHANNEL_SCAN_INDEX_Z, |
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ACCEL_3D_CHANNEL_MAX, |
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}; |
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#define CHANNEL_SCAN_INDEX_TIMESTAMP ACCEL_3D_CHANNEL_MAX |
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struct accel_3d_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 accel[ACCEL_3D_CHANNEL_MAX]; |
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/* Reserve for 3 channels + padding + timestamp */ |
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u32 accel_val[ACCEL_3D_CHANNEL_MAX + 3]; |
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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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int64_t timestamp; |
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}; |
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static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = { |
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HID_USAGE_SENSOR_ACCEL_X_AXIS, |
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HID_USAGE_SENSOR_ACCEL_Y_AXIS, |
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HID_USAGE_SENSOR_ACCEL_Z_AXIS |
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}; |
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|
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/* Channel definitions */ |
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static const struct iio_chan_spec accel_3d_channels[] = { |
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{ |
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.type = IIO_ACCEL, |
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.modified = 1, |
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.channel2 = IIO_MOD_X, |
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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_X, |
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}, { |
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.type = IIO_ACCEL, |
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.modified = 1, |
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.channel2 = IIO_MOD_Y, |
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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_Y, |
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}, { |
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.type = IIO_ACCEL, |
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.modified = 1, |
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.channel2 = IIO_MOD_Z, |
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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_Z, |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP) |
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}; |
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/* Channel definitions */ |
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static const struct iio_chan_spec gravity_channels[] = { |
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{ |
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.type = IIO_GRAVITY, |
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.modified = 1, |
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.channel2 = IIO_MOD_X, |
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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_X, |
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}, { |
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.type = IIO_GRAVITY, |
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.modified = 1, |
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.channel2 = IIO_MOD_Y, |
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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_Y, |
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}, { |
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.type = IIO_GRAVITY, |
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.modified = 1, |
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.channel2 = IIO_MOD_Z, |
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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_Z, |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP), |
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}; |
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/* Adjust channel real bits based on report descriptor */ |
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static void accel_3d_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 accel_3d_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 accel_3d_state *accel_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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s32 min; |
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struct hid_sensor_hub_device *hsdev = |
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accel_state->common_attributes.hsdev; |
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*val = 0; |
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*val2 = 0; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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hid_sensor_power_state(&accel_state->common_attributes, true); |
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report_id = accel_state->accel[chan->scan_index].report_id; |
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min = accel_state->accel[chan->scan_index].logical_minimum; |
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address = accel_3d_addresses[chan->scan_index]; |
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if (report_id >= 0) |
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*val = sensor_hub_input_attr_get_raw_value( |
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accel_state->common_attributes.hsdev, |
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hsdev->usage, address, report_id, |
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SENSOR_HUB_SYNC, |
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min < 0); |
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else { |
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*val = 0; |
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hid_sensor_power_state(&accel_state->common_attributes, |
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false); |
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return -EINVAL; |
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} |
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hid_sensor_power_state(&accel_state->common_attributes, false); |
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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 = accel_state->scale_pre_decml; |
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*val2 = accel_state->scale_post_decml; |
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ret_type = accel_state->scale_precision; |
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break; |
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case IIO_CHAN_INFO_OFFSET: |
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*val = accel_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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&accel_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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&accel_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 accel_3d_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 accel_3d_state *accel_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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&accel_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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&accel_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 accel_3d_info = { |
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.read_raw = &accel_3d_read_raw, |
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.write_raw = &accel_3d_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, void *data, |
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int len, int64_t timestamp) |
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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_with_timestamp(indio_dev, data, timestamp); |
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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 accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev); |
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dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n"); |
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if (atomic_read(&accel_state->common_attributes.data_ready)) { |
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if (!accel_state->timestamp) |
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accel_state->timestamp = iio_get_time_ns(indio_dev); |
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hid_sensor_push_data(indio_dev, |
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accel_state->accel_val, |
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sizeof(accel_state->accel_val), |
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accel_state->timestamp); |
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accel_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 accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev); |
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int offset; |
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int ret = -EINVAL; |
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switch (usage_id) { |
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case HID_USAGE_SENSOR_ACCEL_X_AXIS: |
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case HID_USAGE_SENSOR_ACCEL_Y_AXIS: |
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case HID_USAGE_SENSOR_ACCEL_Z_AXIS: |
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offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS; |
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accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] = |
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*(u32 *)raw_data; |
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ret = 0; |
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break; |
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case HID_USAGE_SENSOR_TIME_TIMESTAMP: |
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accel_state->timestamp = |
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hid_sensor_convert_timestamp( |
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&accel_state->common_attributes, |
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*(int64_t *)raw_data); |
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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 accel_3d_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 accel_3d_state *st) |
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{ |
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int ret; |
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int i; |
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for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) { |
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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_ACCEL_X_AXIS + i, |
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&st->accel[CHANNEL_SCAN_INDEX_X + i]); |
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if (ret < 0) |
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break; |
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accel_3d_adjust_channel_bit_mask(channels, |
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CHANNEL_SCAN_INDEX_X + i, |
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st->accel[CHANNEL_SCAN_INDEX_X + i].size); |
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} |
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dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n", |
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st->accel[0].index, |
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st->accel[0].report_id, |
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st->accel[1].index, st->accel[1].report_id, |
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st->accel[2].index, st->accel[2].report_id); |
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st->scale_precision = hid_sensor_format_scale( |
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hsdev->usage, |
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&st->accel[CHANNEL_SCAN_INDEX_X], |
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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_ACCELERATION, |
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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_accel_3d_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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const char *name; |
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struct iio_dev *indio_dev; |
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struct accel_3d_state *accel_state; |
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const struct iio_chan_spec *channel_spec; |
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int channel_size; |
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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 accel_3d_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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accel_state = iio_priv(indio_dev); |
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accel_state->common_attributes.hsdev = hsdev; |
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accel_state->common_attributes.pdev = pdev; |
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if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) { |
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name = "accel_3d"; |
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channel_spec = accel_3d_channels; |
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channel_size = sizeof(accel_3d_channels); |
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indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels); |
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} else { |
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name = "gravity"; |
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channel_spec = gravity_channels; |
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channel_size = sizeof(gravity_channels); |
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indio_dev->num_channels = ARRAY_SIZE(gravity_channels); |
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} |
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ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, |
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&accel_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(channel_spec, channel_size, 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 = accel_3d_parse_report(pdev, hsdev, |
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(struct iio_chan_spec *)indio_dev->channels, |
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hsdev->usage, accel_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->info = &accel_3d_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(&accel_state->common_attributes.data_ready, 0); |
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ret = hid_sensor_setup_trigger(indio_dev, name, |
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&accel_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_free_dev_mem; |
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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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accel_state->callbacks.send_event = accel_3d_proc_event; |
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accel_state->callbacks.capture_sample = accel_3d_capture_sample; |
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accel_state->callbacks.pdev = pdev; |
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ret = sensor_hub_register_callback(hsdev, hsdev->usage, |
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&accel_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(indio_dev, &accel_state->common_attributes); |
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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_accel_3d_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 accel_3d_state *accel_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, &accel_state->common_attributes); |
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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_accel_3d_ids[] = { |
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{ |
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */ |
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.name = "HID-SENSOR-200073", |
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}, |
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{ /* gravity sensor */ |
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.name = "HID-SENSOR-20007b", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids); |
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static struct platform_driver hid_accel_3d_platform_driver = { |
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.id_table = hid_accel_3d_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_accel_3d_probe, |
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.remove = hid_accel_3d_remove, |
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}; |
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module_platform_driver(hid_accel_3d_platform_driver); |
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|
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MODULE_DESCRIPTION("HID Sensor Accel 3D"); |
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MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>"); |
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MODULE_LICENSE("GPL");
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