// SPDX-License-Identifier: GPL-2.0-only
/*
 * HID Sensors Driver
 * Copyright (c) 2012, Intel Corporation.
 */
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"

enum accel_3d_channel {
        CHANNEL_SCAN_INDEX_X,
        CHANNEL_SCAN_INDEX_Y,
        CHANNEL_SCAN_INDEX_Z,
        ACCEL_3D_CHANNEL_MAX,
};

#define CHANNEL_SCAN_INDEX_TIMESTAMP ACCEL_3D_CHANNEL_MAX
struct accel_3d_state {
        struct hid_sensor_hub_callbacks callbacks;
        struct hid_sensor_common common_attributes;
        struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
        /* Ensure timestamp is naturally aligned */
        struct {
                u32 accel_val[3];
                aligned_s64 timestamp;
        } scan;
        int scale_pre_decml;
        int scale_post_decml;
        int scale_precision;
        int value_offset;
        int64_t timestamp;
};

static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
        HID_USAGE_SENSOR_ACCEL_X_AXIS,
        HID_USAGE_SENSOR_ACCEL_Y_AXIS,
        HID_USAGE_SENSOR_ACCEL_Z_AXIS
};

static const u32 accel_3d_sensitivity_addresses[] = {
        HID_USAGE_SENSOR_DATA_ACCELERATION,
};

/* Channel definitions */
static const struct iio_chan_spec accel_3d_channels[] = {
        {
                .type = IIO_ACCEL,
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .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_X,
        }, {
                .type = IIO_ACCEL,
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .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_Y,
        }, {
                .type = IIO_ACCEL,
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .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_Z,
        },
        IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
};

/* Channel definitions */
static const struct iio_chan_spec gravity_channels[] = {
        {
                .type = IIO_GRAVITY,
                .modified = 1,
                .channel2 = IIO_MOD_X,
                .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_X,
        }, {
                .type = IIO_GRAVITY,
                .modified = 1,
                .channel2 = IIO_MOD_Y,
                .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_Y,
        }, {
                .type = IIO_GRAVITY,
                .modified = 1,
                .channel2 = IIO_MOD_Z,
                .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_Z,
        },
        IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP),
};

/* Channel read_raw handler */
static int accel_3d_read_raw(struct iio_dev *indio_dev,
                              struct iio_chan_spec const *chan,
                              int *val, int *val2,
                              long mask)
{
        struct accel_3d_state *accel_state = iio_priv(indio_dev);
        int report_id = -1;
        u32 address;
        int ret_type;
        s32 min;
        struct hid_sensor_hub_device *hsdev =
                                        accel_state->common_attributes.hsdev;

        *val = 0;
        *val2 = 0;
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
                hid_sensor_power_state(&accel_state->common_attributes, true);
                report_id = accel_state->accel[chan->scan_index].report_id;
                min = accel_state->accel[chan->scan_index].logical_minimum;
                address = accel_3d_addresses[chan->scan_index];
                if (report_id >= 0)
                        *val = sensor_hub_input_attr_get_raw_value(
                                        accel_state->common_attributes.hsdev,
                                        hsdev->usage, address, report_id,
                                        SENSOR_HUB_SYNC,
                                        min < 0);
                else {
                        *val = 0;
                        hid_sensor_power_state(&accel_state->common_attributes,
                                                 false);
                        return -EINVAL;
                }
                hid_sensor_power_state(&accel_state->common_attributes, false);
                ret_type = IIO_VAL_INT;
                break;
        case IIO_CHAN_INFO_SCALE:
                *val = accel_state->scale_pre_decml;
                *val2 = accel_state->scale_post_decml;
                ret_type = accel_state->scale_precision;
                break;
        case IIO_CHAN_INFO_OFFSET:
                *val = accel_state->value_offset;
                ret_type = IIO_VAL_INT;
                break;
        case IIO_CHAN_INFO_SAMP_FREQ:
                ret_type = hid_sensor_read_samp_freq_value(
                        &accel_state->common_attributes, val, val2);
                break;
        case IIO_CHAN_INFO_HYSTERESIS:
                ret_type = hid_sensor_read_raw_hyst_value(
                        &accel_state->common_attributes, val, val2);
                break;
        default:
                ret_type = -EINVAL;
                break;
        }

        return ret_type;
}

/* Channel write_raw handler */
static int accel_3d_write_raw(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan,
                               int val,
                               int val2,
                               long mask)
{
        struct accel_3d_state *accel_state = iio_priv(indio_dev);
        int ret = 0;

        switch (mask) {
        case IIO_CHAN_INFO_SAMP_FREQ:
                ret = hid_sensor_write_samp_freq_value(
                                &accel_state->common_attributes, val, val2);
                break;
        case IIO_CHAN_INFO_HYSTERESIS:
                ret = hid_sensor_write_raw_hyst_value(
                                &accel_state->common_attributes, val, val2);
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static const struct iio_info accel_3d_info = {
        .read_raw = &accel_3d_read_raw,
        .write_raw = &accel_3d_write_raw,
};

/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, void *data,
                                 int len, int64_t timestamp)
{
        dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
        iio_push_to_buffers_with_ts(indio_dev, data, len, timestamp);
}

/* Callback handler to send event after all samples are received and captured */
static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
                                unsigned usage_id,
                                void *priv)
{
        struct iio_dev *indio_dev = platform_get_drvdata(priv);
        struct accel_3d_state *accel_state = iio_priv(indio_dev);

        dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
        if (atomic_read(&accel_state->common_attributes.data_ready)) {
                if (!accel_state->timestamp)
                        accel_state->timestamp = iio_get_time_ns(indio_dev);

                hid_sensor_push_data(indio_dev,
                                     &accel_state->scan,
                                     sizeof(accel_state->scan),
                                     accel_state->timestamp);

                accel_state->timestamp = 0;
        }

        return 0;
}

/* Capture samples in local storage */
static int accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev);
        int offset;
        int ret = -EINVAL;

        switch (usage_id) {
        case HID_USAGE_SENSOR_ACCEL_X_AXIS:
        case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
        case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
                offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
                accel_state->scan.accel_val[CHANNEL_SCAN_INDEX_X + offset] =
                                                *(u32 *)raw_data;
                ret = 0;
        break;
        case HID_USAGE_SENSOR_TIME_TIMESTAMP:
                accel_state->timestamp =
                        hid_sensor_convert_timestamp(
                                        &accel_state->common_attributes,
                                        *(int64_t *)raw_data);
                ret = 0;
        break;
        default:
                break;
        }

        return ret;
}

/* Parse report which is specific to an usage id*/
static int accel_3d_parse_report(struct platform_device *pdev,
                                struct hid_sensor_hub_device *hsdev,
                                struct iio_chan_spec *channels,
                                unsigned usage_id,
                                struct accel_3d_state *st)
{
        int ret;

        for (unsigned int ch = CHANNEL_SCAN_INDEX_X; ch <= CHANNEL_SCAN_INDEX_Z; ch++) {
                ret = sensor_hub_input_get_attribute_info(hsdev,
                                HID_INPUT_REPORT,
                                usage_id,
                                HID_USAGE_SENSOR_ACCEL_X_AXIS + ch,
                                &st->accel[ch]);
                if (ret < 0)
                        break;
                channels[ch].scan_type = (struct iio_scan_type) {
                        .format = 's',
                        .realbits = BYTES_TO_BITS(st->accel[ch].size),
                        .storagebits = BITS_PER_TYPE(u32),
                };
        }
        dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
                        st->accel[0].index,
                        st->accel[0].report_id,
                        st->accel[1].index, st->accel[1].report_id,
                        st->accel[2].index, st->accel[2].report_id);

        st->scale_precision = hid_sensor_format_scale(
                                hsdev->usage,
                                &st->accel[CHANNEL_SCAN_INDEX_X],
                                &st->scale_pre_decml, &st->scale_post_decml);

        return ret;
}

/* Function to initialize the processing for usage id */
static int hid_accel_3d_probe(struct platform_device *pdev)
{
        struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
        int ret = 0;
        const char *name;
        struct iio_dev *indio_dev;
        struct accel_3d_state *accel_state;
        const struct iio_chan_spec *channel_spec;
        int channel_size;

        indio_dev = devm_iio_device_alloc(&pdev->dev,
                                          sizeof(struct accel_3d_state));
        if (indio_dev == NULL)
                return -ENOMEM;

        platform_set_drvdata(pdev, indio_dev);

        accel_state = iio_priv(indio_dev);
        accel_state->common_attributes.hsdev = hsdev;
        accel_state->common_attributes.pdev = pdev;

        if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) {
                name = "accel_3d";
                channel_spec = accel_3d_channels;
                channel_size = sizeof(accel_3d_channels);
                indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
        } else {
                name = "gravity";
                channel_spec = gravity_channels;
                channel_size = sizeof(gravity_channels);
                indio_dev->num_channels = ARRAY_SIZE(gravity_channels);
        }
        ret = hid_sensor_parse_common_attributes(hsdev,
                                                 hsdev->usage,
                                                 &accel_state->common_attributes,
                                                 accel_3d_sensitivity_addresses,
                                                 ARRAY_SIZE(accel_3d_sensitivity_addresses));
        if (ret) {
                dev_err(&pdev->dev, "failed to setup common attributes\n");
                return ret;
        }
        indio_dev->channels = devm_kmemdup(&pdev->dev, channel_spec,
                                           channel_size, GFP_KERNEL);

        if (!indio_dev->channels) {
                dev_err(&pdev->dev, "failed to duplicate channels\n");
                return -ENOMEM;
        }
        ret = accel_3d_parse_report(pdev, hsdev,
                                (struct iio_chan_spec *)indio_dev->channels,
                                hsdev->usage, accel_state);
        if (ret) {
                dev_err(&pdev->dev, "failed to setup attributes\n");
                return ret;
        }

        indio_dev->info = &accel_3d_info;
        indio_dev->name = name;
        indio_dev->modes = INDIO_DIRECT_MODE;

        atomic_set(&accel_state->common_attributes.data_ready, 0);

        ret = hid_sensor_setup_trigger(indio_dev, name,
                                        &accel_state->common_attributes);
        if (ret < 0) {
                dev_err(&pdev->dev, "trigger setup failed\n");
                return ret;
        }

        ret = iio_device_register(indio_dev);
        if (ret) {
                dev_err(&pdev->dev, "device register failed\n");
                goto error_remove_trigger;
        }

        accel_state->callbacks.send_event = accel_3d_proc_event;
        accel_state->callbacks.capture_sample = accel_3d_capture_sample;
        accel_state->callbacks.pdev = pdev;
        ret = sensor_hub_register_callback(hsdev, hsdev->usage,
                                        &accel_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(indio_dev, &accel_state->common_attributes);
        return ret;
}

/* Function to deinitialize the processing for usage id */
static void hid_accel_3d_remove(struct platform_device *pdev)
{
        struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
        struct iio_dev *indio_dev = platform_get_drvdata(pdev);
        struct accel_3d_state *accel_state = iio_priv(indio_dev);

        sensor_hub_remove_callback(hsdev, hsdev->usage);
        iio_device_unregister(indio_dev);
        hid_sensor_remove_trigger(indio_dev, &accel_state->common_attributes);
}

static const struct platform_device_id hid_accel_3d_ids[] = {
        {
                /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
                .name = "HID-SENSOR-200073",
        },
        {       /* gravity sensor */
                .name = "HID-SENSOR-20007b",
        },
        { }
};
MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);

static struct platform_driver hid_accel_3d_platform_driver = {
        .id_table = hid_accel_3d_ids,
        .driver = {
                .name   = KBUILD_MODNAME,
                .pm     = &hid_sensor_pm_ops,
        },
        .probe          = hid_accel_3d_probe,
        .remove         = hid_accel_3d_remove,
};
module_platform_driver(hid_accel_3d_platform_driver);

MODULE_DESCRIPTION("HID Sensor Accel 3D");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("IIO_HID");