// SPDX-License-Identifier: GPL-2.0-only

/*
 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
 *               extra sysfs attribute from DRM. Normal drm_sysfs_class
 *               does not allow adding attributes.
 *
 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (c) 2003-2004 IBM Corp.
 */

#include <linux/acpi.h>
#include <linux/component.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/i2c.h>
#include <linux/kdev_t.h>
#include <linux/pci.h>
#include <linux/property.h>
#include <linux/slab.h>

#include <drm/drm_accel.h>
#include <drm/drm_connector.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_modes.h>
#include <drm/drm_print.h>
#include <drm/drm_property.h>
#include <drm/drm_sysfs.h>

#include <asm/video.h>

#include "drm_internal.h"
#include "drm_crtc_internal.h"

#define to_drm_minor(d) dev_get_drvdata(d)
#define to_drm_connector(d) dev_get_drvdata(d)

/**
 * DOC: overview
 *
 * DRM provides very little additional support to drivers for sysfs
 * interactions, beyond just all the standard stuff. Drivers who want to expose
 * additional sysfs properties and property groups can attach them at either
 * &drm_device.dev or &drm_connector.kdev.
 *
 * Registration is automatically handled when calling drm_dev_register(), or
 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
 * also automatically handled by drm_dev_unregister() and
 * drm_connector_unregister().
 */

static struct device_type drm_sysfs_device_minor = {
        .name = "drm_minor"
};

static struct device_type drm_sysfs_device_connector = {
        .name = "drm_connector",
};

struct class *drm_class;

#ifdef CONFIG_ACPI
static bool drm_connector_acpi_bus_match(struct device *dev)
{
        return dev->type == &drm_sysfs_device_connector;
}

static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
{
        struct drm_connector *connector = to_drm_connector(dev);

        return to_acpi_device_node(connector->fwnode);
}

static struct acpi_bus_type drm_connector_acpi_bus = {
        .name = "drm_connector",
        .match = drm_connector_acpi_bus_match,
        .find_companion = drm_connector_acpi_find_companion,
};

static void drm_sysfs_acpi_register(void)
{
        register_acpi_bus_type(&drm_connector_acpi_bus);
}

static void drm_sysfs_acpi_unregister(void)
{
        unregister_acpi_bus_type(&drm_connector_acpi_bus);
}
#else
static void drm_sysfs_acpi_register(void) { }
static void drm_sysfs_acpi_unregister(void) { }
#endif

static char *drm_devnode(const struct device *dev, umode_t *mode)
{
        return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
}

static int typec_connector_bind(struct device *dev,
                                struct device *typec_connector, void *data)
{
        int ret;

        ret = sysfs_create_link(&dev->kobj, &typec_connector->kobj, "typec_connector");
        if (ret)
                return ret;

        ret = sysfs_create_link(&typec_connector->kobj, &dev->kobj, "drm_connector");
        if (ret)
                sysfs_remove_link(&dev->kobj, "typec_connector");

        return ret;
}

static void typec_connector_unbind(struct device *dev,
                                   struct device *typec_connector, void *data)
{
        sysfs_remove_link(&typec_connector->kobj, "drm_connector");
        sysfs_remove_link(&dev->kobj, "typec_connector");
}

static const struct component_ops typec_connector_ops = {
        .bind = typec_connector_bind,
        .unbind = typec_connector_unbind,
};

static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");

/**
 * drm_sysfs_init - initialize sysfs helpers
 *
 * This is used to create the DRM class, which is the implicit parent of any
 * other top-level DRM sysfs objects.
 *
 * You must call drm_sysfs_destroy() to release the allocated resources.
 *
 * Return: 0 on success, negative error code on failure.
 */
int drm_sysfs_init(void)
{
        int err;

        drm_class = class_create("drm");
        if (IS_ERR(drm_class))
                return PTR_ERR(drm_class);

        err = class_create_file(drm_class, &class_attr_version.attr);
        if (err) {
                class_destroy(drm_class);
                drm_class = NULL;
                return err;
        }

        drm_class->devnode = drm_devnode;

        drm_sysfs_acpi_register();
        return 0;
}

/**
 * drm_sysfs_destroy - destroys DRM class
 *
 * Destroy the DRM device class.
 */
void drm_sysfs_destroy(void)
{
        if (IS_ERR_OR_NULL(drm_class))
                return;
        drm_sysfs_acpi_unregister();
        class_remove_file(drm_class, &class_attr_version.attr);
        class_destroy(drm_class);
        drm_class = NULL;
}

static void drm_sysfs_release(struct device *dev)
{
        kfree(dev);
}

/*
 * Connector properties
 */
static ssize_t status_store(struct device *device,
                           struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct drm_connector *connector = to_drm_connector(device);
        struct drm_device *dev = connector->dev;
        enum drm_connector_force old_force;
        int ret;

        ret = mutex_lock_interruptible(&dev->mode_config.mutex);
        if (ret)
                return ret;

        old_force = connector->force;

        if (sysfs_streq(buf, "detect"))
                connector->force = 0;
        else if (sysfs_streq(buf, "on"))
                connector->force = DRM_FORCE_ON;
        else if (sysfs_streq(buf, "on-digital"))
                connector->force = DRM_FORCE_ON_DIGITAL;
        else if (sysfs_streq(buf, "off"))
                connector->force = DRM_FORCE_OFF;
        else
                ret = -EINVAL;

        if (old_force != connector->force || !connector->force) {
                drm_dbg_kms(dev, "[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
                            connector->base.id, connector->name,
                            old_force, connector->force);

                connector->funcs->fill_modes(connector,
                                             dev->mode_config.max_width,
                                             dev->mode_config.max_height);
        }

        mutex_unlock(&dev->mode_config.mutex);

        return ret ? ret : count;
}

static ssize_t status_show(struct device *device,
                           struct device_attribute *attr,
                           char *buf)
{
        struct drm_connector *connector = to_drm_connector(device);
        enum drm_connector_status status;

        status = READ_ONCE(connector->status);

        return sysfs_emit(buf, "%s\n",
                          drm_get_connector_status_name(status));
}

static ssize_t dpms_show(struct device *device,
                           struct device_attribute *attr,
                           char *buf)
{
        struct drm_connector *connector = to_drm_connector(device);
        int dpms;

        dpms = READ_ONCE(connector->dpms);

        return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
}

static ssize_t enabled_show(struct device *device,
                            struct device_attribute *attr,
                           char *buf)
{
        struct drm_connector *connector = to_drm_connector(device);
        bool enabled;

        enabled = READ_ONCE(connector->encoder);

        return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
}

static ssize_t edid_show(struct file *filp, struct kobject *kobj,
                         const struct bin_attribute *attr, char *buf, loff_t off,
                         size_t count)
{
        struct device *connector_dev = kobj_to_dev(kobj);
        struct drm_connector *connector = to_drm_connector(connector_dev);
        ssize_t ret;

        ret = drm_edid_connector_property_show(connector, buf, off, count);

        return ret;
}

static ssize_t modes_show(struct device *device,
                           struct device_attribute *attr,
                           char *buf)
{
        struct drm_connector *connector = to_drm_connector(device);
        struct drm_display_mode *mode;
        int written = 0;

        mutex_lock(&connector->dev->mode_config.mutex);
        list_for_each_entry(mode, &connector->modes, head) {
                written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
                                    mode->name);
        }
        mutex_unlock(&connector->dev->mode_config.mutex);

        return written;
}

static ssize_t connector_id_show(struct device *device,
                                 struct device_attribute *attr,
                                 char *buf)
{
        struct drm_connector *connector = to_drm_connector(device);

        return sysfs_emit(buf, "%d\n", connector->base.id);
}

static DEVICE_ATTR_RW(status);
static DEVICE_ATTR_RO(enabled);
static DEVICE_ATTR_RO(dpms);
static DEVICE_ATTR_RO(modes);
static DEVICE_ATTR_RO(connector_id);

static struct attribute *connector_dev_attrs[] = {
        &dev_attr_status.attr,
        &dev_attr_enabled.attr,
        &dev_attr_dpms.attr,
        &dev_attr_modes.attr,
        &dev_attr_connector_id.attr,
        NULL
};

static const struct bin_attribute edid_attr = {
        .attr.name = "edid",
        .attr.mode = 0444,
        .size = 0,
        .read = edid_show,
};

static const struct bin_attribute *const connector_bin_attrs[] = {
        &edid_attr,
        NULL
};

static const struct attribute_group connector_dev_group = {
        .attrs = connector_dev_attrs,
        .bin_attrs = connector_bin_attrs,
};

static const struct attribute_group *connector_dev_groups[] = {
        &connector_dev_group,
        NULL
};

int drm_sysfs_connector_add(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct device *kdev;
        int r;

        if (connector->kdev)
                return 0;

        kdev = kzalloc_obj(*kdev);
        if (!kdev)
                return -ENOMEM;

        device_initialize(kdev);
        kdev->class = drm_class;
        kdev->type = &drm_sysfs_device_connector;
        kdev->parent = dev->primary->kdev;
        kdev->groups = connector_dev_groups;
        kdev->release = drm_sysfs_release;
        dev_set_drvdata(kdev, connector);

        r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
        if (r)
                goto err_free;

        drm_dbg_kms(dev, "[CONNECTOR:%d:%s] adding connector to sysfs\n",
                    connector->base.id, connector->name);

        r = device_add(kdev);
        if (r) {
                drm_err(dev, "failed to register connector device: %d\n", r);
                goto err_free;
        }

        connector->kdev = kdev;

        if (dev_fwnode(kdev)) {
                r = component_add(kdev, &typec_connector_ops);
                if (r)
                        drm_err(dev, "failed to add component to create link to typec connector\n");
        }

        return 0;

err_free:
        put_device(kdev);
        return r;
}

int drm_sysfs_connector_add_late(struct drm_connector *connector)
{
        if (connector->ddc)
                return sysfs_create_link(&connector->kdev->kobj,
                                         &connector->ddc->dev.kobj, "ddc");

        return 0;
}

void drm_sysfs_connector_remove_early(struct drm_connector *connector)
{
        if (connector->ddc)
                sysfs_remove_link(&connector->kdev->kobj, "ddc");
}

void drm_sysfs_connector_remove(struct drm_connector *connector)
{
        if (!connector->kdev)
                return;

        if (dev_fwnode(connector->kdev))
                component_del(connector->kdev, &typec_connector_ops);

        drm_dbg_kms(connector->dev,
                    "[CONNECTOR:%d:%s] removing connector from sysfs\n",
                    connector->base.id, connector->name);

        device_unregister(connector->kdev);
        connector->kdev = NULL;
}

void drm_sysfs_lease_event(struct drm_device *dev)
{
        char *event_string = "LEASE=1";
        char *envp[] = { event_string, NULL };

        drm_dbg_lease(dev, "generating lease event\n");

        kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}

/**
 * drm_sysfs_hotplug_event - generate a DRM uevent
 * @dev: DRM device
 *
 * Send a uevent for the DRM device specified by @dev.  Currently we only
 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
 * deal with other types of events.
 *
 * Any new uapi should be using the drm_sysfs_connector_status_event()
 * for uevents on connector status change.
 */
void drm_sysfs_hotplug_event(struct drm_device *dev)
{
        char *event_string = "HOTPLUG=1";
        char *envp[] = { event_string, NULL };

        drm_dbg_kms(dev, "generating hotplug event\n");

        kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(drm_sysfs_hotplug_event);

/**
 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
 * change
 * @connector: connector which has changed
 *
 * Send a uevent for the DRM connector specified by @connector. This will send
 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
 */
void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        char hotplug_str[] = "HOTPLUG=1", conn_id[21];
        char *envp[] = { hotplug_str, conn_id, NULL };

        snprintf(conn_id, sizeof(conn_id),
                 "CONNECTOR=%u", connector->base.id);

        drm_dbg_kms(connector->dev,
                    "[CONNECTOR:%d:%s] generating connector hotplug event\n",
                    connector->base.id, connector->name);

        kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);

/**
 * drm_sysfs_connector_property_event - generate a DRM uevent for connector
 * property change
 * @connector: connector on which property changed
 * @property: connector property which has changed.
 *
 * Send a uevent for the specified DRM connector and property.  Currently we
 * set HOTPLUG=1 and connector id along with the attached property id
 * related to the change.
 */
void drm_sysfs_connector_property_event(struct drm_connector *connector,
                                        struct drm_property *property)
{
        struct drm_device *dev = connector->dev;
        char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
        char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };

        WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
                                           property->base.id));

        snprintf(conn_id, ARRAY_SIZE(conn_id),
                 "CONNECTOR=%u", connector->base.id);
        snprintf(prop_id, ARRAY_SIZE(prop_id),
                 "PROPERTY=%u", property->base.id);

        drm_dbg_kms(connector->dev,
                    "[CONNECTOR:%d:%s] generating connector property event for [PROP:%d:%s]\n",
                    connector->base.id, connector->name,
                    property->base.id, property->name);

        kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(drm_sysfs_connector_property_event);

static ssize_t boot_display_show(struct device *dev, struct device_attribute *attr,
                                 char *buf)
{
        return sysfs_emit(buf, "1\n");
}
static DEVICE_ATTR_RO(boot_display);

static struct attribute *display_attrs[] = {
        &dev_attr_boot_display.attr,
        NULL
};

static umode_t boot_display_visible(struct kobject *kobj,
                                    struct attribute *a, int n)
{
        struct device *dev = kobj_to_dev(kobj)->parent;

        if (dev_is_pci(dev)) {
                struct pci_dev *pdev = to_pci_dev(dev);

                if (video_is_primary_device(&pdev->dev))
                        return a->mode;
        }

        return 0;
}

static const struct attribute_group display_attr_group = {
        .attrs = display_attrs,
        .is_visible = boot_display_visible,
};

static const struct attribute_group *card_dev_groups[] = {
        &display_attr_group,
        NULL
};

struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
        const char *minor_str;
        struct device *kdev;
        int r;

        kdev = kzalloc_obj(*kdev);
        if (!kdev)
                return ERR_PTR(-ENOMEM);

        device_initialize(kdev);

        if (minor->type == DRM_MINOR_ACCEL) {
                minor_str = "accel%d";
                accel_set_device_instance_params(kdev, minor->index);
        } else {
                if (minor->type == DRM_MINOR_RENDER)
                        minor_str = "renderD%d";
                else
                        minor_str = "card%d";

                kdev->devt = MKDEV(DRM_MAJOR, minor->index);
                kdev->class = drm_class;
                kdev->groups = card_dev_groups;
                kdev->type = &drm_sysfs_device_minor;
        }

        kdev->parent = minor->dev->dev;
        kdev->release = drm_sysfs_release;
        dev_set_drvdata(kdev, minor);

        r = dev_set_name(kdev, minor_str, minor->index);
        if (r < 0)
                goto err_free;

        return kdev;

err_free:
        put_device(kdev);
        return ERR_PTR(r);
}

/**
 * drm_class_device_register - register new device with the DRM sysfs class
 * @dev: device to register
 *
 * Registers a new &struct device within the DRM sysfs class. Essentially only
 * used by ttm to have a place for its global settings. Drivers should never use
 * this.
 */
int drm_class_device_register(struct device *dev)
{
        if (!drm_class || IS_ERR(drm_class))
                return -ENOENT;

        dev->class = drm_class;
        return device_register(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_register);

/**
 * drm_class_device_unregister - unregister device with the DRM sysfs class
 * @dev: device to unregister
 *
 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
 * by ttm to have a place for its global settings. Drivers should never use
 * this.
 */
void drm_class_device_unregister(struct device *dev)
{
        return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);