Initial import

1 files changed, 617 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
new file mode 100644
index 000000000..eb7e61078
--- /dev/null
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -0,0 +1,617 @@
+
+/*
+ * 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"
+};
+
+/**
+ * __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_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->pm = &drm_class_dev_pm_ops;
+
+	err = class_create_file(class, &class_attr_version.attr);
+	if (err)
+		goto err_out_class;
+
+	class->devnode = drm_devnode;
+
+	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.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_status old_status;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
+	if (ret)
+		return ret;
+
+	old_status = connector->status;
+
+	if (sysfs_streq(buf, "detect")) {
+		connector->force = 0;
+		connector->status = connector->funcs->detect(connector, true);
+	} 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 (ret == 0 && connector->force) {
+		if (connector->force == DRM_FORCE_ON ||
+		    connector->force == DRM_FORCE_ON_DIGITAL)
+			connector->status = connector_status_connected;
+		else
+			connector->status = connector_status_disconnected;
+		if (connector->funcs->force)
+			connector->funcs->force(connector);
+	}
+
+	if (old_status != connector->status) {
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
+			      connector->base.id,
+			      connector->name,
+			      old_status, connector->status);
+
+		dev->mode_config.delayed_event = true;
+		if (dev->mode_config.poll_enabled)
+			schedule_delayed_work(&dev->mode_config.output_poll_work,
+					      0);
+	}
+
+	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);
+	struct drm_device *dev = connector->dev;
+	uint64_t dpms_status;
+	int ret;
+
+	ret = drm_object_property_get_value(&connector->base,
+					    dev->mode_config.dpms_property,
+					    &dpms_status);
+	if (ret)
+		return 0;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			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, "%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 = 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:
+		case DRM_MODE_CONNECTOR_TV:
+			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_object_property_get_value(&connector->base, 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:
+		case DRM_MODE_CONNECTOR_TV:
+			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_object_property_get_value(&connector->base, 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 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
+};
+
+/* These attributes are for both DVI-I connectors and all types of tv-out. */
+static DEVICE_ATTR_RO(subconnector);
+static DEVICE_ATTR_RO(select_subconnector);
+
+static struct attribute *connector_opt_dev_attrs[] = {
+	&dev_attr_subconnector.attr,
+	&dev_attr_select_subconnector.attr,
+	NULL
+};
+
+static umode_t connector_opt_dev_is_visible(struct kobject *kobj,
+					    struct attribute *attr, int idx)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct drm_connector *connector = to_drm_connector(dev);
+
+	/*
+	 * 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:
+	case DRM_MODE_CONNECTOR_TV:
+		return attr->mode;
+	}
+
+	return 0;
+}
+
+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_opt_dev_group = {
+	.attrs = connector_opt_dev_attrs,
+	.is_visible = connector_opt_dev_is_visible,
+};
+
+static const struct attribute_group *connector_dev_groups[] = {
+	&connector_dev_group,
+	&connector_opt_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);