[linux-block.git] / drivers / gpu / drm / drm_sysfs.c

// 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/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/slab.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 "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(struct device *dev, umode_t *mode)
{
	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
}

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(THIS_MODULE, "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_DEBUG_KMS("[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,
			 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);
	unsigned char *edid;
	size_t size;
	ssize_t ret = 0;

	mutex_lock(&connector->dev->mode_config.mutex);
	if (!connector->edid_blob_ptr)
		goto unlock;

	edid = connector->edid_blob_ptr->data;
	size = connector->edid_blob_ptr->length;
	if (!edid)
		goto unlock;

	if (off >= size)
		goto unlock;

	if (off + count > size)
		count = size - off;
	memcpy(buf, edid + off, count);

	ret = count;
unlock:
	mutex_unlock(&connector->dev->mode_config.mutex);

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

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

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

static struct bin_attribute *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(sizeof(*kdev), GFP_KERNEL);
	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_DEBUG("adding \"%s\" to sysfs\n",
		  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 (connector->ddc)
		return sysfs_create_link(&connector->kdev->kobj,
				 &connector->ddc->dev.kobj, "ddc");
	return 0;

err_free:
	put_device(kdev);
	return r;
}

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

	if (connector->ddc)
		sysfs_remove_link(&connector->kdev->kobj, "ddc");

	DRM_DEBUG("removing \"%s\" from sysfs\n",
		  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_DEBUG("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_DEBUG("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_status_event - generate a DRM uevent for connector
 * property status change
 * @connector: connector on which property status changed
 * @property: connector property whose status changed.
 *
 * Send a uevent for the DRM device specified by @dev.  Currently we
 * set HOTPLUG=1 and connector id along with the attached property id
 * related to the status change.
 */
void drm_sysfs_connector_status_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_DEBUG("generating connector status event\n");

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

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

	if (minor->type == DRM_MINOR_RENDER)
		minor_str = "renderD%d";
	else
		minor_str = "card%d";

	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	if (!kdev)
		return ERR_PTR(-ENOMEM);

	device_initialize(kdev);
	kdev->devt = MKDEV(DRM_MAJOR, minor->index);
	kdev->class = drm_class;
	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);
Commit	Line	Data
55716d26	1	// SPDX-License-Identifier: GPL-2.0-only
0650fd58	2
1da177e4 LT	3	/*
	4	* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
	5	* extra sysfs attribute from DRM. Normal drm_sysfs_class
	6	* does not allow adding attributes.
	7	*
	8	* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
	9	* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
	10	* Copyright (c) 2003-2004 IBM Corp.
1da177e4 LT	11	*/
1da177e4 LT	12
48c429c6	13	#include <linux/acpi.h>
1da177e4	14	#include <linux/device.h>
1da177e4	15	#include <linux/err.h>
2d1a8a48	16	#include <linux/export.h>
0500c04e	17	#include <linux/gfp.h>
e1a29c6c	18	#include <linux/i2c.h>
0500c04e SR	19	#include <linux/kdev_t.h>
	20	#include <linux/slab.h>
	21
	22	#include <drm/drm_connector.h>
	23	#include <drm/drm_device.h>
	24	#include <drm/drm_file.h>
	25	#include <drm/drm_modes.h>
	26	#include <drm/drm_print.h>
	27	#include <drm/drm_property.h>
760285e7	28	#include <drm/drm_sysfs.h>
0500c04e	29
67d0ec4e	30	#include "drm_internal.h"
6fe2ce06	31	#include "drm_crtc_internal.h"
1da177e4	32
5bdebb18 DA	33	#define to_drm_minor(d) dev_get_drvdata(d)
5bdebb18 DA	34	#define to_drm_connector(d) dev_get_drvdata(d)
e8b962b6	35
e2271704 DV	36	/**
	37	* DOC: overview
	38	*
	39	* DRM provides very little additional support to drivers for sysfs
	40	* interactions, beyond just all the standard stuff. Drivers who want to expose
	41	* additional sysfs properties and property groups can attach them at either
	42	* &drm_device.dev or &drm_connector.kdev.
	43	*
	44	* Registration is automatically handled when calling drm_dev_register(), or
	45	* drm_connector_register() in case of hot-plugged connectors. Unregistration is
	46	* also automatically handled by drm_dev_unregister() and
	47	* drm_connector_unregister().
	48	*/
	49
08e4d534 TH	50	static struct device_type drm_sysfs_device_minor = {
	51	.name = "drm_minor"
	52	};
	53
331de7db HG	54	static struct device_type drm_sysfs_device_connector = {
	55	.name = "drm_connector",
	56	};
	57
fcc90213 DH	58	struct class *drm_class;
fcc90213 DH	59
48c429c6 HG	60	#ifdef CONFIG_ACPI
	61	static bool drm_connector_acpi_bus_match(struct device *dev)
	62	{
	63	return dev->type == &drm_sysfs_device_connector;
	64	}
	65
	66	static struct acpi_device drm_connector_acpi_find_companion(struct device dev)
	67	{
	68	struct drm_connector *connector = to_drm_connector(dev);
	69
	70	return to_acpi_device_node(connector->fwnode);
	71	}
	72
	73	static struct acpi_bus_type drm_connector_acpi_bus = {
	74	.name = "drm_connector",
	75	.match = drm_connector_acpi_bus_match,
	76	.find_companion = drm_connector_acpi_find_companion,
	77	};
	78
	79	static void drm_sysfs_acpi_register(void)
	80	{
	81	register_acpi_bus_type(&drm_connector_acpi_bus);
	82	}
	83
	84	static void drm_sysfs_acpi_unregister(void)
	85	{
	86	unregister_acpi_bus_type(&drm_connector_acpi_bus);
	87	}
	88	#else
	89	static void drm_sysfs_acpi_register(void) { }
	90	static void drm_sysfs_acpi_unregister(void) { }
	91	#endif
	92
2c9ede55	93	static char drm_devnode(struct device dev, umode_t *mode)
02200d06 KS	94	{
	95	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
	96	}
	97
82d5e73f	98	static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
1da177e4 LT	99
1da177e4 LT	100	/**
fcc90213 DH	101	* drm_sysfs_init - initialize sysfs helpers
	102	*
	103	* This is used to create the DRM class, which is the implicit parent of any
	104	* other top-level DRM sysfs objects.
1da177e4	105	*
fcc90213	106	* You must call drm_sysfs_destroy() to release the allocated resources.
1da177e4	107	*
fcc90213	108	* Return: 0 on success, negative error code on failure.
1da177e4	109	*/
fcc90213	110	int drm_sysfs_init(void)
1da177e4	111	{
24f73c92	112	int err;
0650fd58	113
fcc90213 DH	114	drm_class = class_create(THIS_MODULE, "drm");
	115	if (IS_ERR(drm_class))
	116	return PTR_ERR(drm_class);
e8b962b6	117
fcc90213 DH	118	err = class_create_file(drm_class, &class_attr_version.attr);
	119	if (err) {
	120	class_destroy(drm_class);
	121	drm_class = NULL;
	122	return err;
	123	}
24f73c92	124
fcc90213	125	drm_class->devnode = drm_devnode;
48c429c6 HG	126
48c429c6 HG	127	drm_sysfs_acpi_register();
fcc90213	128	return 0;
1da177e4 LT	129	}
	130
	131	/**
e8b962b6	132	* drm_sysfs_destroy - destroys DRM class
1da177e4	133	*
e8b962b6	134	* Destroy the DRM device class.
1da177e4	135	*/
e8b962b6	136	void drm_sysfs_destroy(void)
1da177e4	137	{
26b91ae4	138	if (IS_ERR_OR_NULL(drm_class))
1da177e4	139	return;
48c429c6	140	drm_sysfs_acpi_unregister();
0933e2d9	141	class_remove_file(drm_class, &class_attr_version.attr);
e8b962b6	142	class_destroy(drm_class);
49099c49	143	drm_class = NULL;
1da177e4 LT	144	}
1da177e4 LT	145
331de7db HG	146	static void drm_sysfs_release(struct device *dev)
	147	{
	148	kfree(dev);
	149	}
	150
f453ba04 DA	151	/*
	152	* Connector properties
	153	*/
c484f02d	154	static ssize_t status_store(struct device *device,
f453ba04	155	struct device_attribute *attr,
c484f02d	156	const char *buf, size_t count)
f453ba04 DA	157	{
f453ba04 DA	158	struct drm_connector *connector = to_drm_connector(device);
c484f02d	159	struct drm_device *dev = connector->dev;
ed293f77	160	enum drm_connector_force old_force;
007c80a5 CW	161	int ret;
007c80a5 CW	162
c484f02d	163	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
007c80a5 CW	164	if (ret)
007c80a5 CW	165	return ret;
f453ba04	166
ed293f77	167	old_force = connector->force;
c484f02d	168
ed293f77	169	if (sysfs_streq(buf, "detect"))
c484f02d	170	connector->force = 0;
ed293f77	171	else if (sysfs_streq(buf, "on"))
c484f02d	172	connector->force = DRM_FORCE_ON;
ed293f77	173	else if (sysfs_streq(buf, "on-digital"))
c484f02d	174	connector->force = DRM_FORCE_ON_DIGITAL;
ed293f77	175	else if (sysfs_streq(buf, "off"))
c484f02d	176	connector->force = DRM_FORCE_OFF;
ed293f77	177	else
c484f02d CW	178	ret = -EINVAL;
c484f02d CW	179
ed293f77 DV	180	if (old_force != connector->force \|\| !connector->force) {
ed293f77 DV	181	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
c484f02d CW	182	connector->base.id,
c484f02d CW	183	connector->name,
ed293f77	184	old_force, connector->force);
c484f02d	185
ed293f77 DV	186	connector->funcs->fill_modes(connector,
	187	dev->mode_config.max_width,
	188	dev->mode_config.max_height);
c484f02d CW	189	}
	190
	191	mutex_unlock(&dev->mode_config.mutex);
	192
38d8571d	193	return ret ? ret : count;
c484f02d CW	194	}
	195
	196	static ssize_t status_show(struct device *device,
	197	struct device_attribute *attr,
	198	char *buf)
	199	{
	200	struct drm_connector *connector = to_drm_connector(device);
4eb9b945 DV	201	enum drm_connector_status status;
	202
	203	status = READ_ONCE(connector->status);
007c80a5	204
835bc483 TT	205	return sysfs_emit(buf, "%s\n",
835bc483 TT	206	drm_get_connector_status_name(status));
f453ba04 DA	207	}
	208
	209	static ssize_t dpms_show(struct device *device,
	210	struct device_attribute *attr,
	211	char *buf)
	212	{
	213	struct drm_connector *connector = to_drm_connector(device);
621bd0f6	214	int dpms;
f453ba04	215
621bd0f6	216	dpms = READ_ONCE(connector->dpms);
f453ba04	217
835bc483	218	return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
f453ba04 DA	219	}
	220
	221	static ssize_t enabled_show(struct device *device,
	222	struct device_attribute *attr,
	223	char *buf)
	224	{
	225	struct drm_connector *connector = to_drm_connector(device);
4eb9b945 DV	226	bool enabled;
	227
	228	enabled = READ_ONCE(connector->encoder);
f453ba04	229
835bc483	230	return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
f453ba04 DA	231	}
f453ba04 DA	232
2c3c8bea CW	233	static ssize_t edid_show(struct file filp, struct kobject kobj,
	234	struct bin_attribute attr, char buf, loff_t off,
	235	size_t count)
f453ba04	236	{
d122cbf1	237	struct device *connector_dev = kobj_to_dev(kobj);
f453ba04 DA	238	struct drm_connector *connector = to_drm_connector(connector_dev);
	239	unsigned char *edid;
	240	size_t size;
a48a62bc	241	ssize_t ret = 0;
f453ba04	242
a48a62bc	243	mutex_lock(&connector->dev->mode_config.mutex);
f453ba04	244	if (!connector->edid_blob_ptr)
a48a62bc	245	goto unlock;
f453ba04 DA	246
	247	edid = connector->edid_blob_ptr->data;
	248	size = connector->edid_blob_ptr->length;
	249	if (!edid)
a48a62bc	250	goto unlock;
f453ba04 DA	251
f453ba04 DA	252	if (off >= size)
a48a62bc	253	goto unlock;
f453ba04 DA	254
	255	if (off + count > size)
	256	count = size - off;
	257	memcpy(buf, edid + off, count);
	258
a48a62bc DV	259	ret = count;
	260	unlock:
	261	mutex_unlock(&connector->dev->mode_config.mutex);
	262
	263	return ret;
f453ba04 DA	264	}
	265
	266	static ssize_t modes_show(struct device *device,
	267	struct device_attribute *attr,
	268	char *buf)
	269	{
	270	struct drm_connector *connector = to_drm_connector(device);
	271	struct drm_display_mode *mode;
	272	int written = 0;
	273
a48a62bc	274	mutex_lock(&connector->dev->mode_config.mutex);
f453ba04	275	list_for_each_entry(mode, &connector->modes, head) {
9b9f2219	276	written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
f453ba04 DA	277	mode->name);
f453ba04 DA	278	}
a48a62bc	279	mutex_unlock(&connector->dev->mode_config.mutex);
f453ba04 DA	280
	281	return written;
	282	}
	283
c484f02d	284	static DEVICE_ATTR_RW(status);
335f1a62 TI	285	static DEVICE_ATTR_RO(enabled);
	286	static DEVICE_ATTR_RO(dpms);
	287	static DEVICE_ATTR_RO(modes);
	288
	289	static struct attribute *connector_dev_attrs[] = {
	290	&dev_attr_status.attr,
	291	&dev_attr_enabled.attr,
	292	&dev_attr_dpms.attr,
	293	&dev_attr_modes.attr,
	294	NULL
f453ba04 DA	295	};
f453ba04 DA	296
f453ba04 DA	297	static struct bin_attribute edid_attr = {
f453ba04 DA	298	.attr.name = "edid",
e36ebaf4	299	.attr.mode = 0444,
7466f4cc	300	.size = 0,
f453ba04 DA	301	.read = edid_show,
	302	};
	303
335f1a62 TI	304	static struct bin_attribute *connector_bin_attrs[] = {
	305	&edid_attr,
	306	NULL
	307	};
	308
	309	static const struct attribute_group connector_dev_group = {
	310	.attrs = connector_dev_attrs,
	311	.bin_attrs = connector_bin_attrs,
	312	};
	313
335f1a62 TI	314	static const struct attribute_group *connector_dev_groups[] = {
335f1a62 TI	315	&connector_dev_group,
335f1a62 TI	316	NULL
	317	};
	318
f453ba04 DA	319	int drm_sysfs_connector_add(struct drm_connector *connector)
	320	{
	321	struct drm_device *dev = connector->dev;
331de7db HG	322	struct device *kdev;
331de7db HG	323	int r;
f453ba04	324
5bdebb18 DA	325	if (connector->kdev)
5bdebb18 DA	326	return 0;
f453ba04	327
331de7db HG	328	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	329	if (!kdev)
	330	return -ENOMEM;
	331
	332	device_initialize(kdev);
	333	kdev->class = drm_class;
	334	kdev->type = &drm_sysfs_device_connector;
	335	kdev->parent = dev->primary->kdev;
	336	kdev->groups = connector_dev_groups;
	337	kdev->release = drm_sysfs_release;
	338	dev_set_drvdata(kdev, connector);
	339
	340	r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
	341	if (r)
	342	goto err_free;
	343
f453ba04	344	DRM_DEBUG("adding \"%s\" to sysfs\n",
25933820	345	connector->name);
f453ba04	346
331de7db HG	347	r = device_add(kdev);
	348	if (r) {
	349	drm_err(dev, "failed to register connector device: %d\n", r);
	350	goto err_free;
f453ba04 DA	351	}
f453ba04 DA	352
331de7db HG	353	connector->kdev = kdev;
331de7db HG	354
e1a29c6c AP	355	if (connector->ddc)
	356	return sysfs_create_link(&connector->kdev->kobj,
	357	&connector->ddc->dev.kobj, "ddc");
f453ba04	358	return 0;
331de7db HG	359
	360	err_free:
	361	put_device(kdev);
	362	return r;
f453ba04	363	}
f453ba04	364
f453ba04 DA	365	void drm_sysfs_connector_remove(struct drm_connector *connector)
f453ba04 DA	366	{
5bdebb18	367	if (!connector->kdev)
1828fe6c	368	return;
e1a29c6c AP	369
	370	if (connector->ddc)
	371	sysfs_remove_link(&connector->kdev->kobj, "ddc");
	372
f453ba04	373	DRM_DEBUG("removing \"%s\" from sysfs\n",
25933820	374	connector->name);
f453ba04	375
5bdebb18 DA	376	device_unregister(connector->kdev);
5bdebb18 DA	377	connector->kdev = NULL;
f453ba04	378	}
f453ba04	379
ce858828 DV	380	void drm_sysfs_lease_event(struct drm_device *dev)
	381	{
	382	char *event_string = "LEASE=1";
	383	char *envp[] = { event_string, NULL };
	384
	385	DRM_DEBUG("generating lease event\n");
	386
	387	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
	388	}
	389
f453ba04 DA	390	/**
	391	* drm_sysfs_hotplug_event - generate a DRM uevent
	392	* @dev: DRM device
	393	*
	394	* Send a uevent for the DRM device specified by @dev. Currently we only
	395	* set HOTPLUG=1 in the uevent environment, but this could be expanded to
	396	* deal with other types of events.
6fe2ce06 R	397	*
	398	* Any new uapi should be using the drm_sysfs_connector_status_event()
	399	* for uevents on connector status change.
f453ba04 DA	400	*/
	401	void drm_sysfs_hotplug_event(struct drm_device *dev)
	402	{
	403	char *event_string = "HOTPLUG=1";
	404	char *envp[] = { event_string, NULL };
	405
	406	DRM_DEBUG("generating hotplug event\n");
	407
5bdebb18	408	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
f453ba04	409	}
5ca58282	410	EXPORT_SYMBOL(drm_sysfs_hotplug_event);
f453ba04	411
0d6a8c5e SS	412	/**
	413	* drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
	414	* change
	415	* @connector: connector which has changed
	416	*
	417	* Send a uevent for the DRM connector specified by @connector. This will send
	418	* a uevent with the properties HOTPLUG=1 and CONNECTOR.
	419	*/
	420	void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
	421	{
	422	struct drm_device *dev = connector->dev;
	423	char hotplug_str[] = "HOTPLUG=1", conn_id[21];
	424	char *envp[] = { hotplug_str, conn_id, NULL };
	425
	426	snprintf(conn_id, sizeof(conn_id),
	427	"CONNECTOR=%u", connector->base.id);
	428
	429	drm_dbg_kms(connector->dev,
	430	"[CONNECTOR:%d:%s] generating connector hotplug event\n",
	431	connector->base.id, connector->name);
	432
	433	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
	434	}
	435	EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
	436
6fe2ce06 R	437	/**
	438	* drm_sysfs_connector_status_event - generate a DRM uevent for connector
	439	* property status change
	440	* @connector: connector on which property status changed
	441	* @property: connector property whose status changed.
	442	*
	443	* Send a uevent for the DRM device specified by @dev. Currently we
	444	* set HOTPLUG=1 and connector id along with the attached property id
	445	* related to the status change.
	446	*/
	447	void drm_sysfs_connector_status_event(struct drm_connector *connector,
	448	struct drm_property *property)
	449	{
	450	struct drm_device *dev = connector->dev;
	451	char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
	452	char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
	453
	454	WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
	455	property->base.id));
	456
	457	snprintf(conn_id, ARRAY_SIZE(conn_id),
	458	"CONNECTOR=%u", connector->base.id);
	459	snprintf(prop_id, ARRAY_SIZE(prop_id),
	460	"PROPERTY=%u", property->base.id);
	461
	462	DRM_DEBUG("generating connector status event\n");
	463
	464	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
	465	}
	466	EXPORT_SYMBOL(drm_sysfs_connector_status_event);
	467
e1728075	468	struct device drm_sysfs_minor_alloc(struct drm_minor minor)
1da177e4	469	{
e1728075 DH	470	const char *minor_str;
e1728075 DH	471	struct device *kdev;
760c960b	472	int r;
e8b962b6	473
0d49f303	474	if (minor->type == DRM_MINOR_RENDER)
e1728075 DH	475	minor_str = "renderD%d";
	476	else
	477	minor_str = "card%d";
	478
	479	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	480	if (!kdev)
	481	return ERR_PTR(-ENOMEM);
	482
	483	device_initialize(kdev);
	484	kdev->devt = MKDEV(DRM_MAJOR, minor->index);
	485	kdev->class = drm_class;
	486	kdev->type = &drm_sysfs_device_minor;
	487	kdev->parent = minor->dev->dev;
	488	kdev->release = drm_sysfs_release;
	489	dev_set_drvdata(kdev, minor);
	490
	491	r = dev_set_name(kdev, minor_str, minor->index);
760c960b	492	if (r < 0)
e1728075	493	goto err_free;
760c960b	494
e1728075	495	return kdev;
1da177e4	496
e1728075 DH	497	err_free:
	498	put_device(kdev);
	499	return ERR_PTR(r);
1da177e4	500	}
327c225b	501
327c225b	502	/**
e2271704 DV	503	* drm_class_device_register - register new device with the DRM sysfs class
e2271704 DV	504	* @dev: device to register
327c225b	505	*
e2271704 DV	506	* Registers a new &struct device within the DRM sysfs class. Essentially only
	507	* used by ttm to have a place for its global settings. Drivers should never use
	508	* this.
327c225b	509	*/
327c225b TH	510	int drm_class_device_register(struct device *dev)
327c225b TH	511	{
49099c49 DA	512	if (!drm_class \|\| IS_ERR(drm_class))
	513	return -ENOENT;
	514
327c225b TH	515	dev->class = drm_class;
	516	return device_register(dev);
	517	}
	518	EXPORT_SYMBOL_GPL(drm_class_device_register);
	519
e2271704 DV	520	/**
	521	* drm_class_device_unregister - unregister device with the DRM sysfs class
	522	* @dev: device to unregister
	523	*
	524	* Unregisters a &struct device from the DRM sysfs class. Essentially only used
	525	* by ttm to have a place for its global settings. Drivers should never use
	526	* this.
	527	*/
327c225b TH	528	void drm_class_device_unregister(struct device *dev)
	529	{
	530	return device_unregister(dev);
	531	}
	532	EXPORT_SYMBOL_GPL(drm_class_device_unregister);