--- /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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.
+ *
+ */
+#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/delay.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"
+
+#define CHANNEL_SCAN_INDEX_PRESSURE 0
+
+struct press_state {
+ struct hid_sensor_hub_callbacks callbacks;
+ struct hid_sensor_common common_attributes;
+ struct hid_sensor_hub_attribute_info press_attr;
+ u32 press_data;
+ int scale_pre_decml;
+ int scale_post_decml;
+ int scale_precision;
+ int value_offset;
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec press_channels[] = {
+ {
+ .type = IIO_PRESSURE,
+ .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_PRESSURE,
+ }
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
+ int channel, int size)
+{
+ channels[channel].scan_type.sign = 's';
+ /* Real storage bits will change based on the report desc. */
+ channels[channel].scan_type.realbits = size * 8;
+ /* Maximum size of a sample to capture is u32 */
+ channels[channel].scan_type.storagebits = sizeof(u32) * 8;
+}
+
+/* Channel read_raw handler */
+static int press_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct press_state *press_state = iio_priv(indio_dev);
+ int report_id = -1;
+ u32 address;
+ int ret_type;
+
+ *val = 0;
+ *val2 = 0;
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->scan_index) {
+ case CHANNEL_SCAN_INDEX_PRESSURE:
+ report_id = press_state->press_attr.report_id;
+ address =
+ HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
+ break;
+ default:
+ report_id = -1;
+ break;
+ }
+ if (report_id >= 0) {
+ hid_sensor_power_state(&press_state->common_attributes,
+ true);
+ *val = sensor_hub_input_attr_get_raw_value(
+ press_state->common_attributes.hsdev,
+ HID_USAGE_SENSOR_PRESSURE, address,
+ report_id,
+ SENSOR_HUB_SYNC);
+ hid_sensor_power_state(&press_state->common_attributes,
+ false);
+ } else {
+ *val = 0;
+ return -EINVAL;
+ }
+ ret_type = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ *val = press_state->scale_pre_decml;
+ *val2 = press_state->scale_post_decml;
+ ret_type = press_state->scale_precision;
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = press_state->value_offset;
+ ret_type = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret_type = hid_sensor_read_samp_freq_value(
+ &press_state->common_attributes, val, val2);
+ break;
+ case IIO_CHAN_INFO_HYSTERESIS:
+ ret_type = hid_sensor_read_raw_hyst_value(
+ &press_state->common_attributes, val, val2);
+ break;
+ default:
+ ret_type = -EINVAL;
+ break;
+ }
+
+ return ret_type;
+}
+
+/* Channel write_raw handler */
+static int press_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct press_state *press_state = iio_priv(indio_dev);
+ int ret = 0;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = hid_sensor_write_samp_freq_value(
+ &press_state->common_attributes, val, val2);
+ break;
+ case IIO_CHAN_INFO_HYSTERESIS:
+ ret = hid_sensor_write_raw_hyst_value(
+ &press_state->common_attributes, val, val2);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct iio_info press_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &press_read_raw,
+ .write_raw = &press_write_raw,
+};
+
+/* Function to push data to buffer */
+static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
+ int len)
+{
+ dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
+ iio_push_to_buffers(indio_dev, data);
+}
+
+/* Callback handler to send event after all samples are received and captured */
+static int press_proc_event(struct hid_sensor_hub_device *hsdev,
+ unsigned usage_id,
+ void *priv)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(priv);
+ struct press_state *press_state = iio_priv(indio_dev);
+
+ dev_dbg(&indio_dev->dev, "press_proc_event\n");
+ if (atomic_read(&press_state->common_attributes.data_ready))
+ hid_sensor_push_data(indio_dev,
+ &press_state->press_data,
+ sizeof(press_state->press_data));
+
+ return 0;
+}
+
+/* Capture samples in local storage */
+static int press_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 press_state *press_state = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (usage_id) {
+ case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
+ press_state->press_data = *(u32 *)raw_data;
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/* Parse report which is specific to an usage id*/
+static int press_parse_report(struct platform_device *pdev,
+ struct hid_sensor_hub_device *hsdev,
+ struct iio_chan_spec *channels,
+ unsigned usage_id,
+ struct press_state *st)
+{
+ int ret;
+
+ ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
+ usage_id,
+ HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
+ &st->press_attr);
+ if (ret < 0)
+ return ret;
+ press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
+ st->press_attr.size);
+
+ dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
+ st->press_attr.report_id);
+
+ st->scale_precision = hid_sensor_format_scale(
+ HID_USAGE_SENSOR_PRESSURE,
+ &st->press_attr,
+ &st->scale_pre_decml, &st->scale_post_decml);
+
+ /* 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_ATMOSPHERIC_PRESSURE,
+ &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 ret;
+}
+
+/* Function to initialize the processing for usage id */
+static int hid_press_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ static const char *name = "press";
+ struct iio_dev *indio_dev;
+ struct press_state *press_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 press_state));
+ if (!indio_dev)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, indio_dev);
+
+ press_state = iio_priv(indio_dev);
+ press_state->common_attributes.hsdev = hsdev;
+ press_state->common_attributes.pdev = pdev;
+
+ ret = hid_sensor_parse_common_attributes(hsdev,
+ HID_USAGE_SENSOR_PRESSURE,
+ &press_state->common_attributes);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup common attributes\n");
+ return ret;
+ }
+
+ channels = kmemdup(press_channels, sizeof(press_channels), GFP_KERNEL);
+ if (!channels) {
+ dev_err(&pdev->dev, "failed to duplicate channels\n");
+ return -ENOMEM;
+ }
+
+ ret = press_parse_report(pdev, hsdev, channels,
+ HID_USAGE_SENSOR_PRESSURE, press_state);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup attributes\n");
+ goto error_free_dev_mem;
+ }
+
+ indio_dev->channels = channels;
+ indio_dev->num_channels =
+ ARRAY_SIZE(press_channels);
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->info = &press_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");
+ goto error_free_dev_mem;
+ }
+ atomic_set(&press_state->common_attributes.data_ready, 0);
+ ret = hid_sensor_setup_trigger(indio_dev, name,
+ &press_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;
+ }
+
+ press_state->callbacks.send_event = press_proc_event;
+ press_state->callbacks.capture_sample = press_capture_sample;
+ press_state->callbacks.pdev = pdev;
+ ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
+ &press_state->callbacks);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "callback reg failed\n");
+ goto error_iio_unreg;
+ }
+
+ return ret;
+
+error_iio_unreg:
+ iio_device_unregister(indio_dev);
+error_remove_trigger:
+ hid_sensor_remove_trigger(&press_state->common_attributes);
+error_unreg_buffer_funcs:
+ iio_triggered_buffer_cleanup(indio_dev);
+error_free_dev_mem:
+ kfree(indio_dev->channels);
+ return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static int hid_press_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 press_state *press_state = iio_priv(indio_dev);
+
+ sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
+ iio_device_unregister(indio_dev);
+ hid_sensor_remove_trigger(&press_state->common_attributes);
+ iio_triggered_buffer_cleanup(indio_dev);
+ kfree(indio_dev->channels);
+
+ return 0;
+}
+
+static struct platform_device_id hid_press_ids[] = {
+ {
+ /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
+ .name = "HID-SENSOR-200031",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, hid_press_ids);
+
+static struct platform_driver hid_press_platform_driver = {
+ .id_table = hid_press_ids,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .pm = &hid_sensor_pm_ops,
+ },
+ .probe = hid_press_probe,
+ .remove = hid_press_remove,
+};
+module_platform_driver(hid_press_platform_driver);
+
+MODULE_DESCRIPTION("HID Sensor Pressure");
+MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff