diff options
Diffstat (limited to 'drivers/iio/position/hid-sensor-custom-intel-hinge.c')
| -rw-r--r-- | drivers/iio/position/hid-sensor-custom-intel-hinge.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/iio/position/hid-sensor-custom-intel-hinge.c b/drivers/iio/position/hid-sensor-custom-intel-hinge.c new file mode 100644 index 000000000..07c30d217 --- /dev/null +++ b/drivers/iio/position/hid-sensor-custom-intel-hinge.c @@ -0,0 +1,381 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HID Sensors Driver + * Copyright (c) 2020, Intel Corporation. + */ +#include <linux/hid-sensor-hub.h> +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> + +#include "../common/hid-sensors/hid-sensor-trigger.h" + +enum hinge_channel { + CHANNEL_SCAN_INDEX_HINGE_ANGLE, + CHANNEL_SCAN_INDEX_SCREEN_ANGLE, + CHANNEL_SCAN_INDEX_KEYBOARD_ANGLE, + CHANNEL_SCAN_INDEX_MAX, +}; + +#define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX + +static const u32 hinge_addresses[CHANNEL_SCAN_INDEX_MAX] = { + HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1), + HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2), + HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3) +}; + +static const char *const hinge_labels[CHANNEL_SCAN_INDEX_MAX] = { "hinge", + "screen", + "keyboard" }; + +struct hinge_state { + struct iio_dev *indio_dev; + struct hid_sensor_hub_attribute_info hinge[CHANNEL_SCAN_INDEX_MAX]; + struct hid_sensor_hub_callbacks callbacks; + struct hid_sensor_common common_attributes; + const char *labels[CHANNEL_SCAN_INDEX_MAX]; + struct { + u32 hinge_val[3]; + u64 timestamp __aligned(8); + } scan; + + int scale_pre_decml; + int scale_post_decml; + int scale_precision; + int value_offset; + u64 timestamp; +}; + +static const u32 hinge_sensitivity_addresses[] = { + HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1), +}; + +/* Channel definitions */ +static const struct iio_chan_spec hinge_channels[] = { + { + .type = IIO_ANGL, + .indexed = 1, + .channel = 0, + .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_HINGE_ANGLE, + .scan_type = { + .sign = 's', + .storagebits = 32, + }, + }, { + .type = IIO_ANGL, + .indexed = 1, + .channel = 1, + .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_SCREEN_ANGLE, + .scan_type = { + .sign = 's', + .storagebits = 32, + }, + }, { + .type = IIO_ANGL, + .indexed = 1, + .channel = 2, + .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_KEYBOARD_ANGLE, + .scan_type = { + .sign = 's', + .storagebits = 32, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP) +}; + +/* Adjust channel real bits based on report descriptor */ +static void hinge_adjust_channel_realbits(struct iio_chan_spec *channels, + int channel, int size) +{ + channels[channel].scan_type.realbits = size * 8; +} + +/* Channel read_raw handler */ +static int hinge_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask) +{ + struct hinge_state *st = iio_priv(indio_dev); + struct hid_sensor_hub_device *hsdev; + int report_id; + s32 min; + + hsdev = st->common_attributes.hsdev; + switch (mask) { + case IIO_CHAN_INFO_RAW: + hid_sensor_power_state(&st->common_attributes, true); + report_id = st->hinge[chan->scan_index].report_id; + min = st->hinge[chan->scan_index].logical_minimum; + if (report_id < 0) { + hid_sensor_power_state(&st->common_attributes, false); + return -EINVAL; + } + + *val = sensor_hub_input_attr_get_raw_value(st->common_attributes.hsdev, + hsdev->usage, + hinge_addresses[chan->scan_index], + report_id, + SENSOR_HUB_SYNC, min < 0); + + hid_sensor_power_state(&st->common_attributes, false); + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = st->scale_pre_decml; + *val2 = st->scale_post_decml; + return st->scale_precision; + case IIO_CHAN_INFO_OFFSET: + *val = st->value_offset; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + return hid_sensor_read_samp_freq_value(&st->common_attributes, + val, val2); + case IIO_CHAN_INFO_HYSTERESIS: + return hid_sensor_read_raw_hyst_value(&st->common_attributes, + val, val2); + default: + return -EINVAL; + } +} + +/* Channel write_raw handler */ +static int hinge_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, + long mask) +{ + struct hinge_state *st = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + return hid_sensor_write_samp_freq_value(&st->common_attributes, + val, val2); + case IIO_CHAN_INFO_HYSTERESIS: + return hid_sensor_write_raw_hyst_value(&st->common_attributes, + val, val2); + default: + return -EINVAL; + } +} + +static int hinge_read_label(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, char *label) +{ + struct hinge_state *st = iio_priv(indio_dev); + + return sprintf(label, "%s\n", st->labels[chan->channel]); +} + +static const struct iio_info hinge_info = { + .read_raw = hinge_read_raw, + .write_raw = hinge_write_raw, + .read_label = hinge_read_label, +}; + +/* + * Callback handler to send event after all samples are received + * and captured. + */ +static int hinge_proc_event(struct hid_sensor_hub_device *hsdev, + unsigned int usage_id, void *priv) +{ + struct iio_dev *indio_dev = platform_get_drvdata(priv); + struct hinge_state *st = iio_priv(indio_dev); + + if (atomic_read(&st->common_attributes.data_ready)) { + if (!st->timestamp) + st->timestamp = iio_get_time_ns(indio_dev); + + iio_push_to_buffers_with_timestamp(indio_dev, &st->scan, + st->timestamp); + + st->timestamp = 0; + } + return 0; +} + +/* Capture samples in local storage */ +static int hinge_capture_sample(struct hid_sensor_hub_device *hsdev, + unsigned int usage_id, size_t raw_len, + char *raw_data, void *priv) +{ + struct iio_dev *indio_dev = platform_get_drvdata(priv); + struct hinge_state *st = iio_priv(indio_dev); + int offset; + + switch (usage_id) { + case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1): + case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2): + case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3): + offset = usage_id - HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1); + st->scan.hinge_val[offset] = *(u32 *)raw_data; + return 0; + case HID_USAGE_SENSOR_TIME_TIMESTAMP: + st->timestamp = hid_sensor_convert_timestamp(&st->common_attributes, + *(int64_t *)raw_data); + return 0; + default: + return -EINVAL; + } +} + +/* Parse report which is specific to an usage id */ +static int hinge_parse_report(struct platform_device *pdev, + struct hid_sensor_hub_device *hsdev, + struct iio_chan_spec *channels, + unsigned int usage_id, struct hinge_state *st) +{ + int ret; + int i; + + for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; ++i) { + ret = sensor_hub_input_get_attribute_info(hsdev, + HID_INPUT_REPORT, + usage_id, + hinge_addresses[i], + &st->hinge[i]); + if (ret < 0) + return ret; + + hinge_adjust_channel_realbits(channels, i, st->hinge[i].size); + } + + st->scale_precision = hid_sensor_format_scale(HID_USAGE_SENSOR_HINGE, + &st->hinge[CHANNEL_SCAN_INDEX_HINGE_ANGLE], + &st->scale_pre_decml, &st->scale_post_decml); + + return ret; +} + +/* Function to initialize the processing for usage id */ +static int hid_hinge_probe(struct platform_device *pdev) +{ + struct hinge_state *st; + struct iio_dev *indio_dev; + struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; + int ret; + int i; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + platform_set_drvdata(pdev, indio_dev); + + st = iio_priv(indio_dev); + st->common_attributes.hsdev = hsdev; + st->common_attributes.pdev = pdev; + st->indio_dev = indio_dev; + for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; i++) + st->labels[i] = hinge_labels[i]; + + ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, + &st->common_attributes, + hinge_sensitivity_addresses, + ARRAY_SIZE(hinge_sensitivity_addresses)); + if (ret) { + dev_err(&pdev->dev, "failed to setup common attributes\n"); + return ret; + } + + indio_dev->num_channels = ARRAY_SIZE(hinge_channels); + indio_dev->channels = devm_kmemdup(&indio_dev->dev, hinge_channels, + sizeof(hinge_channels), GFP_KERNEL); + if (!indio_dev->channels) + return -ENOMEM; + + ret = hinge_parse_report(pdev, hsdev, + (struct iio_chan_spec *)indio_dev->channels, + hsdev->usage, st); + if (ret) { + dev_err(&pdev->dev, "failed to setup attributes\n"); + return ret; + } + + indio_dev->info = &hinge_info; + indio_dev->name = "hinge"; + indio_dev->modes = INDIO_DIRECT_MODE; + + atomic_set(&st->common_attributes.data_ready, 0); + ret = hid_sensor_setup_trigger(indio_dev, indio_dev->name, + &st->common_attributes); + if (ret < 0) { + dev_err(&pdev->dev, "trigger setup failed\n"); + return ret; + } + + st->callbacks.send_event = hinge_proc_event; + st->callbacks.capture_sample = hinge_capture_sample; + st->callbacks.pdev = pdev; + ret = sensor_hub_register_callback(hsdev, hsdev->usage, &st->callbacks); + if (ret < 0) { + dev_err(&pdev->dev, "callback reg failed\n"); + goto error_remove_trigger; + } + + ret = iio_device_register(indio_dev); + if (ret) { + dev_err(&pdev->dev, "device register failed\n"); + goto error_remove_callback; + } + + return ret; + +error_remove_callback: + sensor_hub_remove_callback(hsdev, hsdev->usage); +error_remove_trigger: + hid_sensor_remove_trigger(indio_dev, &st->common_attributes); + return ret; +} + +/* Function to deinitialize the processing for usage id */ +static int hid_hinge_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 hinge_state *st = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + sensor_hub_remove_callback(hsdev, hsdev->usage); + hid_sensor_remove_trigger(indio_dev, &st->common_attributes); + + return 0; +} + +static const struct platform_device_id hid_hinge_ids[] = { + { + /* Format: HID-SENSOR-INT-usage_id_in_hex_lowercase */ + .name = "HID-SENSOR-INT-020b", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, hid_hinge_ids); + +static struct platform_driver hid_hinge_platform_driver = { + .id_table = hid_hinge_ids, + .driver = { + .name = KBUILD_MODNAME, + .pm = &hid_sensor_pm_ops, + }, + .probe = hid_hinge_probe, + .remove = hid_hinge_remove, +}; +module_platform_driver(hid_hinge_platform_driver); + +MODULE_DESCRIPTION("HID Sensor INTEL Hinge"); +MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(IIO_HID); |