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- /*
- * 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;
- 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;
- }
- indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
- sizeof(dev_rot_channels),
- GFP_KERNEL);
- if (!indio_dev->channels) {
- dev_err(&pdev->dev, "failed to duplicate channels\n");
- return -ENOMEM;
- }
- ret = dev_rot_parse_report(pdev, hsdev,
- (struct iio_chan_spec *)indio_dev->channels,
- HID_USAGE_SENSOR_DEVICE_ORIENTATION,
- rot_state);
- if (ret) {
- dev_err(&pdev->dev, "failed to setup attributes\n");
- return ret;
- }
- 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 const 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,
- .pm = &hid_sensor_pm_ops,
- },
- .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");
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