[mirror_ubuntu-jammy-kernel.git] / drivers / gpu / drm / drm_sysfs.c


/*
 * 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.
 *
 * This file is released under the GPLv2
 *
 */

#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/err.h>

#include "drm_core.h"
#include "drmP.h"

#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)

/**
 * drm_sysfs_suspend - DRM class suspend hook
 * @dev: Linux device to suspend
 * @state: power state to enter
 *
 * Just figures out what the actual struct drm_device associated with
 * @dev is and calls its suspend hook, if present.
 */
static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
{
	struct drm_minor *drm_minor = to_drm_minor(dev);
	struct drm_device *drm_dev = drm_minor->dev;

	if (drm_minor->type == DRM_MINOR_LEGACY &&
	    !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	    drm_dev->driver->suspend)
		return drm_dev->driver->suspend(drm_dev, state);

	return 0;
}

/**
 * drm_sysfs_resume - DRM class resume hook
 * @dev: Linux device to resume
 *
 * Just figures out what the actual struct drm_device associated with
 * @dev is and calls its resume hook, if present.
 */
static int drm_sysfs_resume(struct device *dev)
{
	struct drm_minor *drm_minor = to_drm_minor(dev);
	struct drm_device *drm_dev = drm_minor->dev;

	if (drm_minor->type == DRM_MINOR_LEGACY &&
	    !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	    drm_dev->driver->resume)
		return drm_dev->driver->resume(drm_dev);

	return 0;
}

/* Display the version of drm_core. This doesn't work right in current design */
static ssize_t version_show(struct class *dev, char *buf)
{
	return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
		       CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
}

static CLASS_ATTR(version, S_IRUGO, version_show, NULL);

/**
 * drm_sysfs_create - create a struct drm_sysfs_class structure
 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
 * @name: pointer to a string for the name of this class.
 *
 * This is used to create DRM class pointer that can then be used
 * in calls to drm_sysfs_device_add().
 *
 * Note, the pointer created here is to be destroyed when finished by making a
 * call to drm_sysfs_destroy().
 */
struct class *drm_sysfs_create(struct module *owner, char *name)
{
	struct class *class;
	int err;

	class = class_create(owner, name);
	if (IS_ERR(class)) {
		err = PTR_ERR(class);
		goto err_out;
	}

	class->suspend = drm_sysfs_suspend;
	class->resume = drm_sysfs_resume;

	err = class_create_file(class, &class_attr_version);
	if (err)
		goto err_out_class;

	return class;

err_out_class:
	class_destroy(class);
err_out:
	return ERR_PTR(err);
}

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

/**
 * drm_sysfs_device_release - do nothing
 * @dev: Linux device
 *
 * Normally, this would free the DRM device associated with @dev, along
 * with cleaning up any other stuff.  But we do that in the DRM core, so
 * this function can just return and hope that the core does its job.
 */
static void drm_sysfs_device_release(struct device *dev)
{
	return;
}

/*
 * Connector properties
 */
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 = connector->funcs->detect(connector);
	return snprintf(buf, PAGE_SIZE, "%s",
			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);
	struct drm_device *dev = connector->dev;
	uint64_t dpms_status;
	int ret;

	ret = drm_connector_property_get_value(connector,
					    dev->mode_config.dpms_property,
					    &dpms_status);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s",
			drm_get_dpms_name((int)dpms_status));
}

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

	return snprintf(buf, PAGE_SIZE, connector->encoder ? "enabled" :
			"disabled");
}

static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
			 char *buf, loff_t off, size_t count)
{
	struct device *connector_dev = container_of(kobj, struct device, kobj);
	struct drm_connector *connector = to_drm_connector(connector_dev);
	unsigned char *edid;
	size_t size;

	if (!connector->edid_blob_ptr)
		return 0;

	edid = connector->edid_blob_ptr->data;
	size = connector->edid_blob_ptr->length;
	if (!edid)
		return 0;

	if (off >= size)
		return 0;

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

	return count;
}

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;

	list_for_each_entry(mode, &connector->modes, head) {
		written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
				    mode->name);
	}

	return written;
}

static ssize_t subconnector_show(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop = NULL;
	uint64_t subconnector;
	int is_tv = 0;
	int ret;

	switch (connector->connector_type) {
		case DRM_MODE_CONNECTOR_DVII:
			prop = dev->mode_config.dvi_i_subconnector_property;
			break;
		case DRM_MODE_CONNECTOR_Composite:
		case DRM_MODE_CONNECTOR_SVIDEO:
		case DRM_MODE_CONNECTOR_Component:
			prop = dev->mode_config.tv_subconnector_property;
			is_tv = 1;
			break;
		default:
			DRM_ERROR("Wrong connector type for this property\n");
			return 0;
	}

	if (!prop) {
		DRM_ERROR("Unable to find subconnector property\n");
		return 0;
	}

	ret = drm_connector_property_get_value(connector, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
			drm_get_tv_subconnector_name((int)subconnector) :
			drm_get_dvi_i_subconnector_name((int)subconnector));
}

static ssize_t select_subconnector_show(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop = NULL;
	uint64_t subconnector;
	int is_tv = 0;
	int ret;

	switch (connector->connector_type) {
		case DRM_MODE_CONNECTOR_DVII:
			prop = dev->mode_config.dvi_i_select_subconnector_property;
			break;
		case DRM_MODE_CONNECTOR_Composite:
		case DRM_MODE_CONNECTOR_SVIDEO:
		case DRM_MODE_CONNECTOR_Component:
			prop = dev->mode_config.tv_select_subconnector_property;
			is_tv = 1;
			break;
		default:
			DRM_ERROR("Wrong connector type for this property\n");
			return 0;
	}

	if (!prop) {
		DRM_ERROR("Unable to find select subconnector property\n");
		return 0;
	}

	ret = drm_connector_property_get_value(connector, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
			drm_get_tv_select_name((int)subconnector) :
			drm_get_dvi_i_select_name((int)subconnector));
}

static struct device_attribute connector_attrs[] = {
	__ATTR_RO(status),
	__ATTR_RO(enabled),
	__ATTR_RO(dpms),
	__ATTR_RO(modes),
};

/* These attributes are for both DVI-I connectors and all types of tv-out. */
static struct device_attribute connector_attrs_opt1[] = {
	__ATTR_RO(subconnector),
	__ATTR_RO(select_subconnector),
};

static struct bin_attribute edid_attr = {
	.attr.name = "edid",
	.size = 128,
	.read = edid_show,
};

/**
 * drm_sysfs_connector_add - add an connector to sysfs
 * @connector: connector to add
 *
 * Create an connector device in sysfs, along with its associated connector
 * properties (so far, connection status, dpms, mode list & edid) and
 * generate a hotplug event so userspace knows there's a new connector
 * available.
 *
 * Note:
 * This routine should only be called *once* for each DRM minor registered.
 * A second call for an already registered device will trigger the BUG_ON
 * below.
 */
int drm_sysfs_connector_add(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	int ret = 0, i, j;

	/* We shouldn't get called more than once for the same connector */
	BUG_ON(device_is_registered(&connector->kdev));

	connector->kdev.parent = &dev->primary->kdev;
	connector->kdev.class = drm_class;
	connector->kdev.release = drm_sysfs_device_release;

	DRM_DEBUG("adding \"%s\" to sysfs\n",
		  drm_get_connector_name(connector));

	dev_set_name(&connector->kdev, "card%d-%s",
		     dev->primary->index, drm_get_connector_name(connector));
	ret = device_register(&connector->kdev);

	if (ret) {
		DRM_ERROR("failed to register connector device: %d\n", ret);
		goto out;
	}

	/* Standard attributes */

	for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
		ret = device_create_file(&connector->kdev, &connector_attrs[i]);
		if (ret)
			goto err_out_files;
	}

	/* Optional attributes */
	/*
	 * In the long run it maybe a good idea to make one set of
	 * optionals per connector type.
	 */
	switch (connector->connector_type) {
		case DRM_MODE_CONNECTOR_DVII:
		case DRM_MODE_CONNECTOR_Composite:
		case DRM_MODE_CONNECTOR_SVIDEO:
		case DRM_MODE_CONNECTOR_Component:
			for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
				ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
				if (ret)
					goto err_out_files;
			}
			break;
		default:
			break;
	}

	ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
	if (ret)
		goto err_out_files;

	/* Let userspace know we have a new connector */
	drm_sysfs_hotplug_event(dev);

	return 0;

err_out_files:
	if (i > 0)
		for (j = 0; j < i; j++)
			device_remove_file(&connector->kdev,
					   &connector_attrs[i]);
	device_unregister(&connector->kdev);

out:
	return ret;
}
EXPORT_SYMBOL(drm_sysfs_connector_add);

/**
 * drm_sysfs_connector_remove - remove an connector device from sysfs
 * @connector: connector to remove
 *
 * Remove @connector and its associated attributes from sysfs.  Note that
 * the device model core will take care of sending the "remove" uevent
 * at this time, so we don't need to do it.
 *
 * Note:
 * This routine should only be called if the connector was previously
 * successfully registered.  If @connector hasn't been registered yet,
 * you'll likely see a panic somewhere deep in sysfs code when called.
 */
void drm_sysfs_connector_remove(struct drm_connector *connector)
{
	int i;

	DRM_DEBUG("removing \"%s\" from sysfs\n",
		  drm_get_connector_name(connector));

	for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
		device_remove_file(&connector->kdev, &connector_attrs[i]);
	sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
	device_unregister(&connector->kdev);
}
EXPORT_SYMBOL(drm_sysfs_connector_remove);

/**
 * 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.
 */
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_device_add - adds a class device to sysfs for a character driver
 * @dev: DRM device to be added
 * @head: DRM head in question
 *
 * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
 * as the parent for the Linux device, and make sure it has a file containing
 * the driver we're using (for userspace compatibility).
 */
int drm_sysfs_device_add(struct drm_minor *minor)
{
	int err;
	char *minor_str;

	minor->kdev.parent = &minor->dev->pdev->dev;
	minor->kdev.class = drm_class;
	minor->kdev.release = drm_sysfs_device_release;
	minor->kdev.devt = minor->device;
	if (minor->type == DRM_MINOR_CONTROL)
		minor_str = "controlD%d";
        else if (minor->type == DRM_MINOR_RENDER)
                minor_str = "renderD%d";
        else
                minor_str = "card%d";

	dev_set_name(&minor->kdev, minor_str, minor->index);

	err = device_register(&minor->kdev);
	if (err) {
		DRM_ERROR("device add failed: %d\n", err);
		goto err_out;
	}

	return 0;

	device_unregister(&minor->kdev);
err_out:

	return err;
}

/**
 * drm_sysfs_device_remove - remove DRM device
 * @dev: DRM device to remove
 *
 * This call unregisters and cleans up a class device that was created with a
 * call to drm_sysfs_device_add()
 */
void drm_sysfs_device_remove(struct drm_minor *minor)
{
	device_unregister(&minor->kdev);
}
Commit	Line	Data
0650fd58	1
1da177e4 LT	2	/*
	3	* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
	4	* extra sysfs attribute from DRM. Normal drm_sysfs_class
	5	* does not allow adding attributes.
	6	*
	7	* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
	8	* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
	9	* Copyright (c) 2003-2004 IBM Corp.
	10	*
	11	* This file is released under the GPLv2
	12	*
	13	*/
	14
1da177e4 LT	15	#include <linux/device.h>
	16	#include <linux/kdev_t.h>
	17	#include <linux/err.h>
	18
	19	#include "drm_core.h"
f210973b	20	#include "drmP.h"
1da177e4	21
2c14f28b	22	#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
f453ba04	23	#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
e8b962b6 JB	24
	25	/**
	26	* drm_sysfs_suspend - DRM class suspend hook
	27	* @dev: Linux device to suspend
	28	* @state: power state to enter
	29	*
	30	* Just figures out what the actual struct drm_device associated with
	31	* @dev is and calls its suspend hook, if present.
	32	*/
	33	static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
	34	{
2c14f28b DA	35	struct drm_minor *drm_minor = to_drm_minor(dev);
2c14f28b DA	36	struct drm_device *drm_dev = drm_minor->dev;
e8b962b6	37
112b715e KH	38	if (drm_minor->type == DRM_MINOR_LEGACY &&
	39	!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	40	drm_dev->driver->suspend)
b932ccb5	41	return drm_dev->driver->suspend(drm_dev, state);
e8b962b6 JB	42
	43	return 0;
	44	}
	45
	46	/**
	47	* drm_sysfs_resume - DRM class resume hook
	48	* @dev: Linux device to resume
	49	*
	50	* Just figures out what the actual struct drm_device associated with
	51	* @dev is and calls its resume hook, if present.
	52	*/
	53	static int drm_sysfs_resume(struct device *dev)
	54	{
2c14f28b DA	55	struct drm_minor *drm_minor = to_drm_minor(dev);
2c14f28b DA	56	struct drm_device *drm_dev = drm_minor->dev;
e8b962b6	57
112b715e KH	58	if (drm_minor->type == DRM_MINOR_LEGACY &&
	59	!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	60	drm_dev->driver->resume)
e8b962b6 JB	61	return drm_dev->driver->resume(drm_dev);
	62
	63	return 0;
	64	}
	65
1da177e4 LT	66	/* Display the version of drm_core. This doesn't work right in current design */
	67	static ssize_t version_show(struct class dev, char buf)
	68	{
	69	return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
	70	CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
	71	}
	72
	73	static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
	74
	75	/**
	76	* drm_sysfs_create - create a struct drm_sysfs_class structure
	77	* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
	78	* @name: pointer to a string for the name of this class.
	79	*
e8b962b6	80	* This is used to create DRM class pointer that can then be used
1da177e4 LT	81	* in calls to drm_sysfs_device_add().
	82	*
	83	* Note, the pointer created here is to be destroyed when finished by making a
	84	* call to drm_sysfs_destroy().
	85	*/
0650fd58	86	struct class drm_sysfs_create(struct module owner, char *name)
1da177e4	87	{
0650fd58	88	struct class *class;
24f73c92	89	int err;
0650fd58 GKH	90
0650fd58 GKH	91	class = class_create(owner, name);
94f060bd AM	92	if (IS_ERR(class)) {
94f060bd AM	93	err = PTR_ERR(class);
24f73c92 JG	94	goto err_out;
	95	}
	96
e8b962b6 JB	97	class->suspend = drm_sysfs_suspend;
	98	class->resume = drm_sysfs_resume;
	99
24f73c92 JG	100	err = class_create_file(class, &class_attr_version);
	101	if (err)
	102	goto err_out_class;
0650fd58	103
0650fd58	104	return class;
24f73c92 JG	105
	106	err_out_class:
	107	class_destroy(class);
	108	err_out:
	109	return ERR_PTR(err);
1da177e4 LT	110	}
	111
	112	/**
e8b962b6	113	* drm_sysfs_destroy - destroys DRM class
1da177e4	114	*
e8b962b6	115	* Destroy the DRM device class.
1da177e4	116	*/
e8b962b6	117	void drm_sysfs_destroy(void)
1da177e4	118	{
e8b962b6	119	if ((drm_class == NULL) \|\| (IS_ERR(drm_class)))
1da177e4	120	return;
e8b962b6 JB	121	class_remove_file(drm_class, &class_attr_version);
e8b962b6 JB	122	class_destroy(drm_class);
1da177e4 LT	123	}
1da177e4 LT	124
e8b962b6 JB	125	/**
	126	* drm_sysfs_device_release - do nothing
	127	* @dev: Linux device
	128	*
	129	* Normally, this would free the DRM device associated with @dev, along
	130	* with cleaning up any other stuff. But we do that in the DRM core, so
	131	* this function can just return and hope that the core does its job.
	132	*/
	133	static void drm_sysfs_device_release(struct device *dev)
	134	{
	135	return;
	136	}
	137
f453ba04 DA	138	/*
	139	* Connector properties
	140	*/
	141	static ssize_t status_show(struct device *device,
	142	struct device_attribute *attr,
	143	char *buf)
	144	{
	145	struct drm_connector *connector = to_drm_connector(device);
	146	enum drm_connector_status status;
	147
	148	status = connector->funcs->detect(connector);
	149	return snprintf(buf, PAGE_SIZE, "%s",
	150	drm_get_connector_status_name(status));
	151	}
	152
	153	static ssize_t dpms_show(struct device *device,
	154	struct device_attribute *attr,
	155	char *buf)
	156	{
	157	struct drm_connector *connector = to_drm_connector(device);
	158	struct drm_device *dev = connector->dev;
	159	uint64_t dpms_status;
	160	int ret;
	161
	162	ret = drm_connector_property_get_value(connector,
	163	dev->mode_config.dpms_property,
	164	&dpms_status);
	165	if (ret)
	166	return 0;
	167
	168	return snprintf(buf, PAGE_SIZE, "%s",
	169	drm_get_dpms_name((int)dpms_status));
	170	}
	171
	172	static ssize_t enabled_show(struct device *device,
	173	struct device_attribute *attr,
	174	char *buf)
	175	{
	176	struct drm_connector *connector = to_drm_connector(device);
	177
	178	return snprintf(buf, PAGE_SIZE, connector->encoder ? "enabled" :
	179	"disabled");
	180	}
	181
	182	static ssize_t edid_show(struct kobject kobj, struct bin_attribute attr,
	183	char *buf, loff_t off, size_t count)
	184	{
	185	struct device *connector_dev = container_of(kobj, struct device, kobj);
	186	struct drm_connector *connector = to_drm_connector(connector_dev);
	187	unsigned char *edid;
	188	size_t size;
	189
	190	if (!connector->edid_blob_ptr)
	191	return 0;
	192
	193	edid = connector->edid_blob_ptr->data;
	194	size = connector->edid_blob_ptr->length;
	195	if (!edid)
	196	return 0;
	197
	198	if (off >= size)
	199	return 0;
	200
	201	if (off + count > size)
202	count = size - off;
203	memcpy(buf, edid + off, count);
204
205	return count;
206	}
207
208	static ssize_t modes_show(struct device *device,
209	struct device_attribute *attr,
210	char *buf)
211	{
212	struct drm_connector *connector = to_drm_connector(device);
213	struct drm_display_mode *mode;
214	int written = 0;
215
216	list_for_each_entry(mode, &connector->modes, head) {
217	written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
218	mode->name);
219	}
220
221	return written;
222	}
223
224	static ssize_t subconnector_show(struct device *device,
225	struct device_attribute *attr,
226	char *buf)
227	{
228	struct drm_connector *connector = to_drm_connector(device);
229	struct drm_device *dev = connector->dev;
230	struct drm_property *prop = NULL;
231	uint64_t subconnector;
232	int is_tv = 0;
233	int ret;
234
235	switch (connector->connector_type) {
236	case DRM_MODE_CONNECTOR_DVII:
237	prop = dev->mode_config.dvi_i_subconnector_property;
238	break;
239	case DRM_MODE_CONNECTOR_Composite:
240	case DRM_MODE_CONNECTOR_SVIDEO:
241	case DRM_MODE_CONNECTOR_Component:
242	prop = dev->mode_config.tv_subconnector_property;
243	is_tv = 1;
244	break;
245	default:
246	DRM_ERROR("Wrong connector type for this property\n");
247	return 0;
248	}
249
250	if (!prop) {
251	DRM_ERROR("Unable to find subconnector property\n");
252	return 0;
253	}
254
255	ret = drm_connector_property_get_value(connector, prop, &subconnector);
256	if (ret)
257	return 0;
258
259	return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
260	drm_get_tv_subconnector_name((int)subconnector) :
261	drm_get_dvi_i_subconnector_name((int)subconnector));
262	}
263
264	static ssize_t select_subconnector_show(struct device *device,
265	struct device_attribute *attr,
266	char *buf)
267	{
268	struct drm_connector *connector = to_drm_connector(device);
269	struct drm_device *dev = connector->dev;
270	struct drm_property *prop = NULL;
271	uint64_t subconnector;
272	int is_tv = 0;
273	int ret;
274
275	switch (connector->connector_type) {
276	case DRM_MODE_CONNECTOR_DVII:
277	prop = dev->mode_config.dvi_i_select_subconnector_property;
278	break;
279	case DRM_MODE_CONNECTOR_Composite:
280	case DRM_MODE_CONNECTOR_SVIDEO:
281	case DRM_MODE_CONNECTOR_Component:
282	prop = dev->mode_config.tv_select_subconnector_property;
283	is_tv = 1;
284	break;
285	default:
286	DRM_ERROR("Wrong connector type for this property\n");
287	return 0;
288	}
289
290	if (!prop) {
291	DRM_ERROR("Unable to find select subconnector property\n");
292	return 0;
293	}
294
295	ret = drm_connector_property_get_value(connector, prop, &subconnector);
296	if (ret)
297	return 0;
298
299	return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
300	drm_get_tv_select_name((int)subconnector) :
301	drm_get_dvi_i_select_name((int)subconnector));
302	}
303
304	static struct device_attribute connector_attrs[] = {
305	__ATTR_RO(status),
306	__ATTR_RO(enabled),
307	__ATTR_RO(dpms),
308	__ATTR_RO(modes),
309	};
310
311	/* These attributes are for both DVI-I connectors and all types of tv-out. */
312	static struct device_attribute connector_attrs_opt1[] = {
313	__ATTR_RO(subconnector),
314	__ATTR_RO(select_subconnector),
315	};
316
317	static struct bin_attribute edid_attr = {
318	.attr.name = "edid",
319	.size = 128,
320	.read = edid_show,
321	};
322
323	/**
324	* drm_sysfs_connector_add - add an connector to sysfs
325	* @connector: connector to add
326	*
327	* Create an connector device in sysfs, along with its associated connector
328	* properties (so far, connection status, dpms, mode list & edid) and
329	* generate a hotplug event so userspace knows there's a new connector
330	* available.
331	*
332	* Note:
333	* This routine should only be called once for each DRM minor registered.
334	* A second call for an already registered device will trigger the BUG_ON
335	* below.
336	*/
337	int drm_sysfs_connector_add(struct drm_connector *connector)
338	{
339	struct drm_device *dev = connector->dev;
340	int ret = 0, i, j;
341
342	/* We shouldn't get called more than once for the same connector */
343	BUG_ON(device_is_registered(&connector->kdev));
344
345	connector->kdev.parent = &dev->primary->kdev;
346	connector->kdev.class = drm_class;
347	connector->kdev.release = drm_sysfs_device_release;
348
349	DRM_DEBUG("adding \"%s\" to sysfs\n",
350	drm_get_connector_name(connector));
351
2ead054c KS	352	dev_set_name(&connector->kdev, "card%d-%s",
2ead054c KS	353	dev->primary->index, drm_get_connector_name(connector));
f453ba04 DA	354	ret = device_register(&connector->kdev);
	355
	356	if (ret) {
	357	DRM_ERROR("failed to register connector device: %d\n", ret);
	358	goto out;
	359	}
	360
	361	/* Standard attributes */
	362
	363	for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
	364	ret = device_create_file(&connector->kdev, &connector_attrs[i]);
	365	if (ret)
	366	goto err_out_files;
	367	}
	368
	369	/* Optional attributes */
	370	/*
	371	* In the long run it maybe a good idea to make one set of
	372	* optionals per connector type.
	373	*/
	374	switch (connector->connector_type) {
	375	case DRM_MODE_CONNECTOR_DVII:
	376	case DRM_MODE_CONNECTOR_Composite:
	377	case DRM_MODE_CONNECTOR_SVIDEO:
	378	case DRM_MODE_CONNECTOR_Component:
	379	for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
	380	ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
	381	if (ret)
	382	goto err_out_files;
	383	}
	384	break;
	385	default:
	386	break;
	387	}
	388
	389	ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
	390	if (ret)
	391	goto err_out_files;
	392
	393	/* Let userspace know we have a new connector */
	394	drm_sysfs_hotplug_event(dev);
	395
	396	return 0;
	397
	398	err_out_files:
	399	if (i > 0)
	400	for (j = 0; j < i; j++)
	401	device_remove_file(&connector->kdev,
	402	&connector_attrs[i]);
	403	device_unregister(&connector->kdev);
	404
	405	out:
	406	return ret;
	407	}
	408	EXPORT_SYMBOL(drm_sysfs_connector_add);
	409
	410	/**
	411	* drm_sysfs_connector_remove - remove an connector device from sysfs
	412	* @connector: connector to remove
	413	*
	414	* Remove @connector and its associated attributes from sysfs. Note that
	415	* the device model core will take care of sending the "remove" uevent
	416	* at this time, so we don't need to do it.
	417	*
418	* Note:
419	* This routine should only be called if the connector was previously
420	* successfully registered. If @connector hasn't been registered yet,
421	* you'll likely see a panic somewhere deep in sysfs code when called.
422	*/
423	void drm_sysfs_connector_remove(struct drm_connector *connector)
424	{
425	int i;
426
427	DRM_DEBUG("removing \"%s\" from sysfs\n",
428	drm_get_connector_name(connector));
429
430	for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
431	device_remove_file(&connector->kdev, &connector_attrs[i]);
432	sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
433	device_unregister(&connector->kdev);
434	}
435	EXPORT_SYMBOL(drm_sysfs_connector_remove);
436
437	/**
438	* drm_sysfs_hotplug_event - generate a DRM uevent
439	* @dev: DRM device
440	*
441	* Send a uevent for the DRM device specified by @dev. Currently we only
442	* set HOTPLUG=1 in the uevent environment, but this could be expanded to
443	* deal with other types of events.
444	*/
445	void drm_sysfs_hotplug_event(struct drm_device *dev)
446	{
447	char *event_string = "HOTPLUG=1";
448	char *envp[] = { event_string, NULL };
449
450	DRM_DEBUG("generating hotplug event\n");
451
452	kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
453	}
5ca58282	454	EXPORT_SYMBOL(drm_sysfs_hotplug_event);
f453ba04	455
1da177e4 LT	456	/**
1da177e4 LT	457	* drm_sysfs_device_add - adds a class device to sysfs for a character driver
e8b962b6 JB	458	* @dev: DRM device to be added
e8b962b6 JB	459	* @head: DRM head in question
1da177e4	460	*
e8b962b6 JB	461	* Add a DRM device to the DRM's device model class. We use @dev's PCI device
	462	* as the parent for the Linux device, and make sure it has a file containing
	463	* the driver we're using (for userspace compatibility).
1da177e4	464	*/
2c14f28b	465	int drm_sysfs_device_add(struct drm_minor *minor)
1da177e4	466	{
e8b962b6	467	int err;
2c14f28b	468	char *minor_str;
e8b962b6	469
2c14f28b DA	470	minor->kdev.parent = &minor->dev->pdev->dev;
	471	minor->kdev.class = drm_class;
	472	minor->kdev.release = drm_sysfs_device_release;
	473	minor->kdev.devt = minor->device;
f453ba04 DA	474	if (minor->type == DRM_MINOR_CONTROL)
	475	minor_str = "controlD%d";
	476	else if (minor->type == DRM_MINOR_RENDER)
	477	minor_str = "renderD%d";
	478	else
	479	minor_str = "card%d";
e8b962b6	480
8f4bbd9f	481	dev_set_name(&minor->kdev, minor_str, minor->index);
2c14f28b DA	482
2c14f28b DA	483	err = device_register(&minor->kdev);
e8b962b6 JB	484	if (err) {
e8b962b6 JB	485	DRM_ERROR("device add failed: %d\n", err);
24f73c92 JG	486	goto err_out;
24f73c92 JG	487	}
1da177e4	488
e8b962b6	489	return 0;
24f73c92	490
2c14f28b	491	device_unregister(&minor->kdev);
24f73c92	492	err_out:
e8b962b6 JB	493
e8b962b6 JB	494	return err;
1da177e4 LT	495	}
	496
	497	/**
e8b962b6 JB	498	* drm_sysfs_device_remove - remove DRM device
e8b962b6 JB	499	* @dev: DRM device to remove
1da177e4 LT	500	*
	501	* This call unregisters and cleans up a class device that was created with a
	502	* call to drm_sysfs_device_add()
	503	*/
2c14f28b	504	void drm_sysfs_device_remove(struct drm_minor *minor)
1da177e4	505	{
2c14f28b	506	device_unregister(&minor->kdev);
1da177e4	507	}