--- /dev/null
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * 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.
+ */
+
+#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/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"
+
+struct dev_rot_state {
+ struct hid_sensor_hub_callbacks callbacks;
+ struct hid_sensor_common common_attributes;
+ struct hid_sensor_hub_attribute_info quaternion;
+ u32 sampled_vals[4];
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec dev_rot_channels[] = {
+ {
+ .type = IIO_ROT,
+ .modified = 1,
+ .channel2 = IIO_MOD_QUATERNION,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+ BIT(IIO_CHAN_INFO_HYSTERESIS)
+ }
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
+ int size)
+{
+ chan->scan_type.sign = 's';
+ /* Real storage bits will change based on the report desc. */
+ chan->scan_type.realbits = size * 8;
+ /* Maximum size of a sample to capture is u32 */
+ chan->scan_type.storagebits = sizeof(u32) * 8;
+ chan->scan_type.repeat = 4;
+}
+
+/* Channel read_raw handler */
+static int dev_rot_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int size, int *vals, int *val_len,
+ long mask)
+{
+ struct dev_rot_state *rot_state = iio_priv(indio_dev);
+ int ret_type;
+ int i;
+
+ vals[0] = 0;
+ vals[1] = 0;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (size >= 4) {
+ for (i = 0; i < 4; ++i)
+ vals[i] = rot_state->sampled_vals[i];
+ ret_type = IIO_VAL_INT_MULTIPLE;
+ *val_len = 4;
+ } else
+ ret_type = -EINVAL;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret_type = hid_sensor_read_samp_freq_value(
+ &rot_state->common_attributes, &vals[0], &vals[1]);
+ break;
+ case IIO_CHAN_INFO_HYSTERESIS:
+ ret_type = hid_sensor_read_raw_hyst_value(
+ &rot_state->common_attributes, &vals[0], &vals[1]);
+ break;
+ default:
+ ret_type = -EINVAL;
+ break;
+ }
+
+ return ret_type;
+}
+
+/* Channel write_raw handler */
+static int dev_rot_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct dev_rot_state *rot_state = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = hid_sensor_write_samp_freq_value(
+ &rot_state->common_attributes, val, val2);
+ break;
+ case IIO_CHAN_INFO_HYSTERESIS:
+ ret = hid_sensor_write_raw_hyst_value(
+ &rot_state->common_attributes, val, val2);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct iio_info dev_rot_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw_multi = &dev_rot_read_raw,
+ .write_raw = &dev_rot_write_raw,
+};
+
+/* Function to push data to buffer */
+static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
+{
+ dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
+ iio_push_to_buffers(indio_dev, (u8 *)data);
+ dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
+
+}
+
+/* Callback handler to send event after all samples are received and captured */
+static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
+ unsigned usage_id,
+ void *priv)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(priv);
+ struct dev_rot_state *rot_state = iio_priv(indio_dev);
+
+ dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
+ if (atomic_read(&rot_state->common_attributes.data_ready))
+ hid_sensor_push_data(indio_dev,
+ (u8 *)rot_state->sampled_vals,
+ sizeof(rot_state->sampled_vals));
+
+ return 0;
+}
+
+/* Capture samples in local storage */
+static int dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev);
+
+ if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
+ memcpy(rot_state->sampled_vals, raw_data,
+ sizeof(rot_state->sampled_vals));
+ dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
+ sizeof(rot_state->sampled_vals));
+ }
+
+ return 0;
+}
+
+/* Parse report which is specific to an usage id*/
+static int dev_rot_parse_report(struct platform_device *pdev,
+ struct hid_sensor_hub_device *hsdev,
+ struct iio_chan_spec *channels,
+ unsigned usage_id,
+ struct dev_rot_state *st)
+{
+ int ret;
+
+ ret = sensor_hub_input_get_attribute_info(hsdev,
+ HID_INPUT_REPORT,
+ usage_id,
+ HID_USAGE_SENSOR_ORIENT_QUATERNION,
+ &st->quaternion);
+ if (ret)
+ return ret;
+
+ dev_rot_adjust_channel_bit_mask(&channels[0],
+ st->quaternion.size / 4);
+
+ dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
+ st->quaternion.report_id);
+
+ dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
+ st->quaternion.size);
+
+ /* 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_ORIENTATION,
+ &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 0;
+}
+
+/* Function to initialize the processing for usage id */
+static int hid_dev_rot_probe(struct platform_device *pdev)
+{
+ int ret;
+ static char *name = "dev_rotation";
+ struct iio_dev *indio_dev;
+ struct dev_rot_state *rot_state;
+ struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+ struct iio_chan_spec *channels;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev,
+ sizeof(struct dev_rot_state));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ rot_state = iio_priv(indio_dev);
+ rot_state->common_attributes.hsdev = hsdev;
+ rot_state->common_attributes.pdev = pdev;
+
+ ret = hid_sensor_parse_common_attributes(hsdev,
+ HID_USAGE_SENSOR_DEVICE_ORIENTATION,
+ &rot_state->common_attributes);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup common attributes\n");
+ return ret;
+ }
+
+ channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
+ sizeof(dev_rot_channels), GFP_KERNEL);
+ if (!channels) {
+ dev_err(&pdev->dev, "failed to duplicate channels\n");
+ return -ENOMEM;
+ }
+
+ ret = dev_rot_parse_report(pdev, hsdev, channels,
+ HID_USAGE_SENSOR_DEVICE_ORIENTATION, rot_state);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup attributes\n");
+ return ret;
+ }
+
+ indio_dev->channels = channels;
+ indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->info = &dev_rot_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");
+ return ret;
+ }
+ atomic_set(&rot_state->common_attributes.data_ready, 0);
+ ret = hid_sensor_setup_trigger(indio_dev, name,
+ &rot_state->common_attributes);
+ if (ret) {
+ 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;
+ }
+
+ rot_state->callbacks.send_event = dev_rot_proc_event;
+ rot_state->callbacks.capture_sample = dev_rot_capture_sample;
+ rot_state->callbacks.pdev = pdev;
+ ret = sensor_hub_register_callback(hsdev,
+ HID_USAGE_SENSOR_DEVICE_ORIENTATION,
+ &rot_state->callbacks);
+ if (ret) {
+ dev_err(&pdev->dev, "callback reg failed\n");
+ goto error_iio_unreg;
+ }
+
+ return 0;
+
+error_iio_unreg:
+ iio_device_unregister(indio_dev);
+error_remove_trigger:
+ hid_sensor_remove_trigger(&rot_state->common_attributes);
+error_unreg_buffer_funcs:
+ iio_triggered_buffer_cleanup(indio_dev);
+ return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static int hid_dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev);
+
+ sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION);
+ iio_device_unregister(indio_dev);
+ hid_sensor_remove_trigger(&rot_state->common_attributes);
+ iio_triggered_buffer_cleanup(indio_dev);
+
+ return 0;
+}
+
+static struct platform_device_id hid_dev_rot_ids[] = {
+ {
+ /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
+ .name = "HID-SENSOR-20008a",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
+
+static struct platform_driver hid_dev_rot_platform_driver = {
+ .id_table = hid_dev_rot_ids,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+ .probe = hid_dev_rot_probe,
+ .remove = hid_dev_rot_remove,
+};
+module_platform_driver(hid_dev_rot_platform_driver);
+
+MODULE_DESCRIPTION("HID Sensor Device Rotation");
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff