// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2021-2024 Linaro Ltd. */

#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/types.h>

#include "ipa.h"
#include "ipa_sysfs.h"
#include "ipa_version.h"

static const char *ipa_version_string(struct ipa *ipa)
{
        switch (ipa->version) {
        case IPA_VERSION_3_0:
                return "3.0";
        case IPA_VERSION_3_1:
                return "3.1";
        case IPA_VERSION_3_5:
                return "3.5";
        case IPA_VERSION_3_5_1:
                return "3.5.1";
        case IPA_VERSION_4_0:
                return "4.0";
        case IPA_VERSION_4_1:
                return "4.1";
        case IPA_VERSION_4_2:
                return "4.2";
        case IPA_VERSION_4_5:
                return "4.5";
        case IPA_VERSION_4_7:
                return "4.7";
        case IPA_VERSION_4_9:
                return "4.9";
        case IPA_VERSION_4_11:
                return "4.11";
        case IPA_VERSION_5_0:
                return "5.0";
        case IPA_VERSION_5_1:
                return "5.1";
        case IPA_VERSION_5_5:
                return "5.5";
        default:
                return "0.0";   /* Should not happen */
        }
}

static ssize_t
version_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct ipa *ipa = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%s\n", ipa_version_string(ipa));
}

static DEVICE_ATTR_RO(version);

static struct attribute *ipa_attrs[] = {
        &dev_attr_version.attr,
        NULL
};

const struct attribute_group ipa_attribute_group = {
        .attrs          = ipa_attrs,
};

static const char *ipa_offload_string(struct ipa *ipa)
{
        return ipa->version < IPA_VERSION_4_5 ? "MAPv4" : "MAPv5";
}

static ssize_t rx_offload_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct ipa *ipa = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%s\n", ipa_offload_string(ipa));
}

static DEVICE_ATTR_RO(rx_offload);

static ssize_t tx_offload_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct ipa *ipa = dev_get_drvdata(dev);

        return sysfs_emit(buf, "%s\n", ipa_offload_string(ipa));
}

static DEVICE_ATTR_RO(tx_offload);

static struct attribute *ipa_feature_attrs[] = {
        &dev_attr_rx_offload.attr,
        &dev_attr_tx_offload.attr,
        NULL
};

const struct attribute_group ipa_feature_attribute_group = {
        .name           = "feature",
        .attrs          = ipa_feature_attrs,
};

static umode_t ipa_endpoint_id_is_visible(struct kobject *kobj,
                                          struct attribute *attr, int n)
{
        struct ipa *ipa = dev_get_drvdata(kobj_to_dev(kobj));
        struct device_attribute *dev_attr;
        struct dev_ext_attribute *ea;
        bool visible;

        /* An endpoint id attribute is only visible if it's defined */
        dev_attr = container_of(attr, struct device_attribute, attr);
        ea = container_of(dev_attr, struct dev_ext_attribute, attr);

        visible = !!ipa->name_map[(enum ipa_endpoint_name)(uintptr_t)ea->var];

        return visible ? attr->mode : 0;
}

static ssize_t endpoint_id_attr_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
{
        struct ipa *ipa = dev_get_drvdata(dev);
        struct ipa_endpoint *endpoint;
        struct dev_ext_attribute *ea;

        ea = container_of(attr, struct dev_ext_attribute, attr);
        endpoint = ipa->name_map[(enum ipa_endpoint_name)(uintptr_t)ea->var];

        return sysfs_emit(buf, "%u\n", endpoint->endpoint_id);
}

#define ENDPOINT_ID_ATTR(_n, _endpoint_name)                                \
        static struct dev_ext_attribute dev_attr_endpoint_id_ ## _n = {     \
                .attr   = __ATTR(_n, 0444, endpoint_id_attr_show, NULL),    \
                .var    = (void *)(_endpoint_name),                         \
        }

ENDPOINT_ID_ATTR(modem_rx, IPA_ENDPOINT_AP_MODEM_RX);
ENDPOINT_ID_ATTR(modem_tx, IPA_ENDPOINT_AP_MODEM_TX);

static struct attribute *ipa_endpoint_id_attrs[] = {
        &dev_attr_endpoint_id_modem_rx.attr.attr,
        &dev_attr_endpoint_id_modem_tx.attr.attr,
        NULL
};

const struct attribute_group ipa_endpoint_id_attribute_group = {
        .name           = "endpoint_id",
        .is_visible     = ipa_endpoint_id_is_visible,
        .attrs          = ipa_endpoint_id_attrs,
};

/* Reuse endpoint ID attributes for the legacy modem endpoint IDs */
#define MODEM_ATTR(_n, _endpoint_name)                                      \
        static struct dev_ext_attribute dev_attr_modem_ ## _n = {           \
                .attr   = __ATTR(_n, 0444, endpoint_id_attr_show, NULL),    \
                .var    = (void *)(_endpoint_name),                         \
        }

MODEM_ATTR(rx_endpoint_id, IPA_ENDPOINT_AP_MODEM_RX);
MODEM_ATTR(tx_endpoint_id, IPA_ENDPOINT_AP_MODEM_TX);

static struct attribute *ipa_modem_attrs[] = {
        &dev_attr_modem_rx_endpoint_id.attr.attr,
        &dev_attr_modem_tx_endpoint_id.attr.attr,
        NULL,
};

const struct attribute_group ipa_modem_attribute_group = {
        .name           = "modem",
        .attrs          = ipa_modem_attrs,
};