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);