[deliverable/linux.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/gfp.h>
#include <linux/err.h>
#include <linux/export.h>

#include <drm/drm_sysfs.h>
#include <drm/drm_core.h>
#include <drm/drmP.h>
#include "drm_internal.h"

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

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

struct class *drm_class;

/**
 * __drm_class_suspend - internal DRM class suspend routine
 * @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_class_suspend(struct device *dev, pm_message_t state)
{
	if (dev->type == &drm_sysfs_device_minor) {
		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_class_suspend - internal DRM class suspend hook. Simply calls
 * __drm_class_suspend() with the correct pm state.
 * @dev: Linux device to suspend
 */
static int drm_class_suspend(struct device *dev)
{
	return __drm_class_suspend(dev, PMSG_SUSPEND);
}

/**
 * drm_class_freeze - internal DRM class freeze hook. Simply calls
 * __drm_class_suspend() with the correct pm state.
 * @dev: Linux device to freeze
 */
static int drm_class_freeze(struct device *dev)
{
	return __drm_class_suspend(dev, PMSG_FREEZE);
}

/**
 * drm_class_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_class_resume(struct device *dev)
{
	if (dev->type == &drm_sysfs_device_minor) {
		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;
}

static const struct dev_pm_ops drm_class_dev_pm_ops = {
	.suspend	= drm_class_suspend,
	.resume		= drm_class_resume,
	.freeze		= drm_class_freeze,
};

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,
		CORE_NAME " "
		__stringify(CORE_MAJOR) "."
		__stringify(CORE_MINOR) "."
		__stringify(CORE_PATCHLEVEL) " "
		CORE_DATE);

/**
 * 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);

	drm_class->pm = &drm_class_dev_pm_ops;

	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;
	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;
	class_remove_file(drm_class, &class_attr_version.attr);
	class_destroy(drm_class);
	drm_class = NULL;
}

/*
 * 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);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			drm_get_connector_status_name(connector->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 snprintf(buf, PAGE_SIZE, "%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);

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

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 += snprintf(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
};

/**
 * drm_sysfs_connector_add - add a connector to sysfs
 * @connector: connector to add
 *
 * Create a 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.
 */
int drm_sysfs_connector_add(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;

	if (connector->kdev)
		return 0;

	connector->kdev =
		device_create_with_groups(drm_class, dev->primary->kdev, 0,
					  connector, connector_dev_groups,
					  "card%d-%s", dev->primary->index,
					  connector->name);
	DRM_DEBUG("adding \"%s\" to sysfs\n",
		  connector->name);

	if (IS_ERR(connector->kdev)) {
		DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
		return PTR_ERR(connector->kdev);
	}

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

	return 0;
}

/**
 * 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)
{
	if (!connector->kdev)
		return;
	DRM_DEBUG("removing \"%s\" from sysfs\n",
		  connector->name);

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

/**
 * 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);

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

/**
 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
 * @minor: minor to allocate sysfs device for
 *
 * This allocates a new sysfs device for @minor and returns it. The device is
 * not registered nor linked. The caller has to use device_add() and
 * device_del() to register and unregister it.
 *
 * Note that dev_get_drvdata() on the new device will return the minor.
 * However, the device does not hold a ref-count to the minor nor to the
 * underlying drm_device. This is unproblematic as long as you access the
 * private data only in sysfs callbacks. device_del() disables those
 * synchronously, so they cannot be called after you cleanup a minor.
 */
struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
	const char *minor_str;
	struct device *kdev;
	int r;

	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";

	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 a struct device in the drm class.
 *
 * @dev: pointer to struct device to register.
 *
 * @dev should have all relevant members pre-filled with the exception
 * of the class member. In particular, the device_type member must
 * be set.
 */

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);

void drm_class_device_unregister(struct device *dev)
{
	return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);
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>
1da177e4 LT	16	#include <linux/kdev_t.h>
5a0e3ad6	17	#include <linux/gfp.h>
1da177e4	18	#include <linux/err.h>
2d1a8a48	19	#include <linux/export.h>
1da177e4	20
760285e7 DH	21	#include <drm/drm_sysfs.h>
	22	#include <drm/drm_core.h>
	23	#include <drm/drmP.h>
67d0ec4e	24	#include "drm_internal.h"
1da177e4	25
5bdebb18 DA	26	#define to_drm_minor(d) dev_get_drvdata(d)
5bdebb18 DA	27	#define to_drm_connector(d) dev_get_drvdata(d)
e8b962b6	28
08e4d534 TH	29	static struct device_type drm_sysfs_device_minor = {
	30	.name = "drm_minor"
	31	};
	32
fcc90213 DH	33	struct class *drm_class;
fcc90213 DH	34
e8b962b6	35	/**
cf4b91f2	36	* __drm_class_suspend - internal DRM class suspend routine
e8b962b6 JB	37	* @dev: Linux device to suspend
	38	* @state: power state to enter
	39	*
	40	* Just figures out what the actual struct drm_device associated with
	41	* @dev is and calls its suspend hook, if present.
	42	*/
cf4b91f2	43	static int __drm_class_suspend(struct device *dev, pm_message_t state)
e8b962b6	44	{
08e4d534 TH	45	if (dev->type == &drm_sysfs_device_minor) {
	46	struct drm_minor *drm_minor = to_drm_minor(dev);
	47	struct drm_device *drm_dev = drm_minor->dev;
	48
	49	if (drm_minor->type == DRM_MINOR_LEGACY &&
	50	!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	51	drm_dev->driver->suspend)
	52	return drm_dev->driver->suspend(drm_dev, state);
	53	}
e8b962b6 JB	54	return 0;
	55	}
	56
cf4b91f2 SK	57	/**
	58	* drm_class_suspend - internal DRM class suspend hook. Simply calls
	59	* __drm_class_suspend() with the correct pm state.
	60	* @dev: Linux device to suspend
	61	*/
	62	static int drm_class_suspend(struct device *dev)
	63	{
	64	return __drm_class_suspend(dev, PMSG_SUSPEND);
	65	}
	66
	67	/**
	68	* drm_class_freeze - internal DRM class freeze hook. Simply calls
	69	* __drm_class_suspend() with the correct pm state.
	70	* @dev: Linux device to freeze
	71	*/
	72	static int drm_class_freeze(struct device *dev)
	73	{
	74	return __drm_class_suspend(dev, PMSG_FREEZE);
	75	}
	76
e8b962b6	77	/**
08e4d534	78	* drm_class_resume - DRM class resume hook
e8b962b6 JB	79	* @dev: Linux device to resume
	80	*
	81	* Just figures out what the actual struct drm_device associated with
	82	* @dev is and calls its resume hook, if present.
	83	*/
08e4d534	84	static int drm_class_resume(struct device *dev)
e8b962b6	85	{
08e4d534 TH	86	if (dev->type == &drm_sysfs_device_minor) {
	87	struct drm_minor *drm_minor = to_drm_minor(dev);
	88	struct drm_device *drm_dev = drm_minor->dev;
	89
	90	if (drm_minor->type == DRM_MINOR_LEGACY &&
	91	!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
	92	drm_dev->driver->resume)
	93	return drm_dev->driver->resume(drm_dev);
	94	}
e8b962b6 JB	95	return 0;
	96	}
	97
cf4b91f2 SK	98	static const struct dev_pm_ops drm_class_dev_pm_ops = {
	99	.suspend = drm_class_suspend,
	100	.resume = drm_class_resume,
	101	.freeze = drm_class_freeze,
	102	};
	103
2c9ede55	104	static char drm_devnode(struct device dev, umode_t *mode)
02200d06 KS	105	{
	106	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
	107	}
	108
0933e2d9 AK	109	static CLASS_ATTR_STRING(version, S_IRUGO,
	110	CORE_NAME " "
	111	__stringify(CORE_MAJOR) "."
	112	__stringify(CORE_MINOR) "."
	113	__stringify(CORE_PATCHLEVEL) " "
	114	CORE_DATE);
1da177e4 LT	115
1da177e4 LT	116	/**
fcc90213 DH	117	* drm_sysfs_init - initialize sysfs helpers
	118	*
	119	* This is used to create the DRM class, which is the implicit parent of any
	120	* other top-level DRM sysfs objects.
1da177e4	121	*
fcc90213	122	* You must call drm_sysfs_destroy() to release the allocated resources.
1da177e4	123	*
fcc90213	124	* Return: 0 on success, negative error code on failure.
1da177e4	125	*/
fcc90213	126	int drm_sysfs_init(void)
1da177e4	127	{
24f73c92	128	int err;
0650fd58	129
fcc90213 DH	130	drm_class = class_create(THIS_MODULE, "drm");
	131	if (IS_ERR(drm_class))
	132	return PTR_ERR(drm_class);
e8b962b6	133
fcc90213	134	drm_class->pm = &drm_class_dev_pm_ops;
0650fd58	135
fcc90213 DH	136	err = class_create_file(drm_class, &class_attr_version.attr);
	137	if (err) {
	138	class_destroy(drm_class);
	139	drm_class = NULL;
	140	return err;
	141	}
24f73c92	142
fcc90213 DH	143	drm_class->devnode = drm_devnode;
fcc90213 DH	144	return 0;
1da177e4 LT	145	}
	146
	147	/**
e8b962b6	148	* drm_sysfs_destroy - destroys DRM class
1da177e4	149	*
e8b962b6	150	* Destroy the DRM device class.
1da177e4	151	*/
e8b962b6	152	void drm_sysfs_destroy(void)
1da177e4	153	{
26b91ae4	154	if (IS_ERR_OR_NULL(drm_class))
1da177e4	155	return;
0933e2d9	156	class_remove_file(drm_class, &class_attr_version.attr);
e8b962b6	157	class_destroy(drm_class);
49099c49	158	drm_class = NULL;
1da177e4 LT	159	}
1da177e4 LT	160
f453ba04 DA	161	/*
	162	* Connector properties
	163	*/
c484f02d	164	static ssize_t status_store(struct device *device,
f453ba04	165	struct device_attribute *attr,
c484f02d	166	const char *buf, size_t count)
f453ba04 DA	167	{
f453ba04 DA	168	struct drm_connector *connector = to_drm_connector(device);
c484f02d	169	struct drm_device *dev = connector->dev;
ed293f77	170	enum drm_connector_force old_force;
007c80a5 CW	171	int ret;
007c80a5 CW	172
c484f02d	173	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
007c80a5 CW	174	if (ret)
007c80a5 CW	175	return ret;
f453ba04	176
ed293f77	177	old_force = connector->force;
c484f02d	178
ed293f77	179	if (sysfs_streq(buf, "detect"))
c484f02d	180	connector->force = 0;
ed293f77	181	else if (sysfs_streq(buf, "on"))
c484f02d	182	connector->force = DRM_FORCE_ON;
ed293f77	183	else if (sysfs_streq(buf, "on-digital"))
c484f02d	184	connector->force = DRM_FORCE_ON_DIGITAL;
ed293f77	185	else if (sysfs_streq(buf, "off"))
c484f02d	186	connector->force = DRM_FORCE_OFF;
ed293f77	187	else
c484f02d CW	188	ret = -EINVAL;
c484f02d CW	189
ed293f77 DV	190	if (old_force != connector->force \|\| !connector->force) {
ed293f77 DV	191	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
c484f02d CW	192	connector->base.id,
c484f02d CW	193	connector->name,
ed293f77	194	old_force, connector->force);
c484f02d	195
ed293f77 DV	196	connector->funcs->fill_modes(connector,
	197	dev->mode_config.max_width,
	198	dev->mode_config.max_height);
c484f02d CW	199	}
	200
	201	mutex_unlock(&dev->mode_config.mutex);
	202
38d8571d	203	return ret ? ret : count;
c484f02d CW	204	}
	205
	206	static ssize_t status_show(struct device *device,
	207	struct device_attribute *attr,
	208	char *buf)
	209	{
	210	struct drm_connector *connector = to_drm_connector(device);
007c80a5	211
75185c92	212	return snprintf(buf, PAGE_SIZE, "%s\n",
c484f02d	213	drm_get_connector_status_name(connector->status));
f453ba04 DA	214	}
	215
	216	static ssize_t dpms_show(struct device *device,
	217	struct device_attribute *attr,
	218	char *buf)
	219	{
	220	struct drm_connector *connector = to_drm_connector(device);
621bd0f6	221	int dpms;
f453ba04	222
621bd0f6	223	dpms = READ_ONCE(connector->dpms);
f453ba04	224
75185c92	225	return snprintf(buf, PAGE_SIZE, "%s\n",
621bd0f6	226	drm_get_dpms_name(dpms));
f453ba04 DA	227	}
	228
	229	static ssize_t enabled_show(struct device *device,
	230	struct device_attribute *attr,
	231	char *buf)
	232	{
	233	struct drm_connector *connector = to_drm_connector(device);
	234
75185c92	235	return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
f453ba04 DA	236	"disabled");
	237	}
	238
2c3c8bea CW	239	static ssize_t edid_show(struct file filp, struct kobject kobj,
	240	struct bin_attribute attr, char buf, loff_t off,
	241	size_t count)
f453ba04	242	{
d122cbf1	243	struct device *connector_dev = kobj_to_dev(kobj);
f453ba04 DA	244	struct drm_connector *connector = to_drm_connector(connector_dev);
	245	unsigned char *edid;
	246	size_t size;
a48a62bc	247	ssize_t ret = 0;
f453ba04	248
a48a62bc	249	mutex_lock(&connector->dev->mode_config.mutex);
f453ba04	250	if (!connector->edid_blob_ptr)
a48a62bc	251	goto unlock;
f453ba04 DA	252
	253	edid = connector->edid_blob_ptr->data;
	254	size = connector->edid_blob_ptr->length;
	255	if (!edid)
a48a62bc	256	goto unlock;
f453ba04 DA	257
f453ba04 DA	258	if (off >= size)
a48a62bc	259	goto unlock;
f453ba04 DA	260
	261	if (off + count > size)
	262	count = size - off;
	263	memcpy(buf, edid + off, count);
	264
a48a62bc DV	265	ret = count;
	266	unlock:
	267	mutex_unlock(&connector->dev->mode_config.mutex);
	268
	269	return ret;
f453ba04 DA	270	}
	271
	272	static ssize_t modes_show(struct device *device,
	273	struct device_attribute *attr,
	274	char *buf)
	275	{
	276	struct drm_connector *connector = to_drm_connector(device);
	277	struct drm_display_mode *mode;
	278	int written = 0;
	279
a48a62bc	280	mutex_lock(&connector->dev->mode_config.mutex);
f453ba04 DA	281	list_for_each_entry(mode, &connector->modes, head) {
	282	written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
	283	mode->name);
	284	}
a48a62bc	285	mutex_unlock(&connector->dev->mode_config.mutex);
f453ba04 DA	286
	287	return written;
	288	}
	289
c484f02d	290	static DEVICE_ATTR_RW(status);
335f1a62 TI	291	static DEVICE_ATTR_RO(enabled);
	292	static DEVICE_ATTR_RO(dpms);
	293	static DEVICE_ATTR_RO(modes);
	294
	295	static struct attribute *connector_dev_attrs[] = {
	296	&dev_attr_status.attr,
	297	&dev_attr_enabled.attr,
	298	&dev_attr_dpms.attr,
	299	&dev_attr_modes.attr,
	300	NULL
f453ba04 DA	301	};
f453ba04 DA	302
f453ba04 DA	303	static struct bin_attribute edid_attr = {
f453ba04 DA	304	.attr.name = "edid",
e36ebaf4	305	.attr.mode = 0444,
7466f4cc	306	.size = 0,
f453ba04 DA	307	.read = edid_show,
	308	};
	309
335f1a62 TI	310	static struct bin_attribute *connector_bin_attrs[] = {
	311	&edid_attr,
	312	NULL
	313	};
	314
	315	static const struct attribute_group connector_dev_group = {
	316	.attrs = connector_dev_attrs,
	317	.bin_attrs = connector_bin_attrs,
	318	};
	319
335f1a62 TI	320	static const struct attribute_group *connector_dev_groups[] = {
335f1a62 TI	321	&connector_dev_group,
335f1a62 TI	322	NULL
	323	};
	324
f453ba04	325	/**
3b02ab88	326	* drm_sysfs_connector_add - add a connector to sysfs
f453ba04 DA	327	* @connector: connector to add
f453ba04 DA	328	*
3b02ab88	329	* Create a connector device in sysfs, along with its associated connector
f453ba04 DA	330	* properties (so far, connection status, dpms, mode list & edid) and
	331	* generate a hotplug event so userspace knows there's a new connector
	332	* available.
f453ba04 DA	333	*/
	334	int drm_sysfs_connector_add(struct drm_connector *connector)
	335	{
	336	struct drm_device *dev = connector->dev;
f453ba04	337
5bdebb18 DA	338	if (connector->kdev)
5bdebb18 DA	339	return 0;
f453ba04	340
335f1a62 TI	341	connector->kdev =
	342	device_create_with_groups(drm_class, dev->primary->kdev, 0,
	343	connector, connector_dev_groups,
	344	"card%d-%s", dev->primary->index,
	345	connector->name);
f453ba04	346	DRM_DEBUG("adding \"%s\" to sysfs\n",
25933820	347	connector->name);
f453ba04	348
5bdebb18 DA	349	if (IS_ERR(connector->kdev)) {
5bdebb18 DA	350	DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
335f1a62	351	return PTR_ERR(connector->kdev);
f453ba04 DA	352	}
f453ba04 DA	353
f453ba04 DA	354	/* Let userspace know we have a new connector */
	355	drm_sysfs_hotplug_event(dev);
	356
	357	return 0;
f453ba04	358	}
f453ba04 DA	359
	360	/**
	361	* drm_sysfs_connector_remove - remove an connector device from sysfs
	362	* @connector: connector to remove
	363	*
	364	* Remove @connector and its associated attributes from sysfs. Note that
	365	* the device model core will take care of sending the "remove" uevent
	366	* at this time, so we don't need to do it.
	367	*
	368	* Note:
	369	* This routine should only be called if the connector was previously
	370	* successfully registered. If @connector hasn't been registered yet,
	371	* you'll likely see a panic somewhere deep in sysfs code when called.
	372	*/
	373	void drm_sysfs_connector_remove(struct drm_connector *connector)
	374	{
5bdebb18	375	if (!connector->kdev)
1828fe6c	376	return;
f453ba04	377	DRM_DEBUG("removing \"%s\" from sysfs\n",
25933820	378	connector->name);
f453ba04	379
5bdebb18 DA	380	device_unregister(connector->kdev);
5bdebb18 DA	381	connector->kdev = NULL;
f453ba04	382	}
f453ba04 DA	383
	384	/**
	385	* drm_sysfs_hotplug_event - generate a DRM uevent
	386	* @dev: DRM device
	387	*
	388	* Send a uevent for the DRM device specified by @dev. Currently we only
	389	* set HOTPLUG=1 in the uevent environment, but this could be expanded to
	390	* deal with other types of events.
	391	*/
	392	void drm_sysfs_hotplug_event(struct drm_device *dev)
	393	{
	394	char *event_string = "HOTPLUG=1";
	395	char *envp[] = { event_string, NULL };
	396
	397	DRM_DEBUG("generating hotplug event\n");
	398
5bdebb18	399	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
f453ba04	400	}
5ca58282	401	EXPORT_SYMBOL(drm_sysfs_hotplug_event);
f453ba04	402
760c960b DH	403	static void drm_sysfs_release(struct device *dev)
	404	{
	405	kfree(dev);
	406	}
	407
1da177e4	408	/**
e1728075 DH	409	* drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
e1728075 DH	410	* @minor: minor to allocate sysfs device for
1da177e4	411	*
e1728075 DH	412	* This allocates a new sysfs device for @minor and returns it. The device is
	413	* not registered nor linked. The caller has to use device_add() and
	414	* device_del() to register and unregister it.
	415	*
	416	* Note that dev_get_drvdata() on the new device will return the minor.
	417	* However, the device does not hold a ref-count to the minor nor to the
	418	* underlying drm_device. This is unproblematic as long as you access the
	419	* private data only in sysfs callbacks. device_del() disables those
	420	* synchronously, so they cannot be called after you cleanup a minor.
1da177e4	421	*/
e1728075	422	struct device drm_sysfs_minor_alloc(struct drm_minor minor)
1da177e4	423	{
e1728075 DH	424	const char *minor_str;
e1728075 DH	425	struct device *kdev;
760c960b	426	int r;
e8b962b6	427
f453ba04 DA	428	if (minor->type == DRM_MINOR_CONTROL)
f453ba04 DA	429	minor_str = "controlD%d";
e1728075 DH	430	else if (minor->type == DRM_MINOR_RENDER)
	431	minor_str = "renderD%d";
	432	else
	433	minor_str = "card%d";
	434
	435	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	436	if (!kdev)
	437	return ERR_PTR(-ENOMEM);
	438
	439	device_initialize(kdev);
	440	kdev->devt = MKDEV(DRM_MAJOR, minor->index);
	441	kdev->class = drm_class;
	442	kdev->type = &drm_sysfs_device_minor;
	443	kdev->parent = minor->dev->dev;
	444	kdev->release = drm_sysfs_release;
	445	dev_set_drvdata(kdev, minor);
	446
	447	r = dev_set_name(kdev, minor_str, minor->index);
760c960b	448	if (r < 0)
e1728075	449	goto err_free;
760c960b	450
e1728075	451	return kdev;
1da177e4	452
e1728075 DH	453	err_free:
	454	put_device(kdev);
	455	return ERR_PTR(r);
1da177e4	456	}
327c225b	457
327c225b TH	458	/**
	459	* drm_class_device_register - Register a struct device in the drm class.
	460	*
	461	* @dev: pointer to struct device to register.
	462	*
	463	* @dev should have all relevant members pre-filled with the exception
	464	* of the class member. In particular, the device_type member must
	465	* be set.
	466	*/
	467
	468	int drm_class_device_register(struct device *dev)
	469	{
49099c49 DA	470	if (!drm_class \|\| IS_ERR(drm_class))
	471	return -ENOENT;
	472
327c225b TH	473	dev->class = drm_class;
	474	return device_register(dev);
	475	}
	476	EXPORT_SYMBOL_GPL(drm_class_device_register);
	477
	478	void drm_class_device_unregister(struct device *dev)
	479	{
	480	return device_unregister(dev);
	481	}
	482	EXPORT_SYMBOL_GPL(drm_class_device_unregister);