- 根目录:
- 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 "drm_sysfs.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)
static struct device_type drm_sysfs_device_minor = {
.name = "drm_minor"
};
/**
* drm_class_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_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_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 char *drm_devnode(struct device *dev, mode_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->suspend = drm_class_suspend;
class->resume = drm_class_resume;
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_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)
{
memset(dev, 0, sizeof(struct device));
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;
int ret;
ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
if (ret)
return ret;
status = connector->funcs->detect(connector, true);
mutex_unlock(&connector->dev->mode_config.mutex);
return snprintf(buf, PAGE_SIZE, "%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);
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\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_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:
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_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",
.attr.mode = 0444,
.size = 0,
.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 attr_cnt = 0;
int opt_cnt = 0;
int i;
int ret = 0;
/* 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 (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
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:
case DRM_MODE_CONNECTOR_TV:
for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
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:
for (i = 0; i < opt_cnt; i++)
device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
for (i = 0; i < attr_cnt; i++)
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->dev;
minor->kdev.class = drm_class;
minor->kdev.release = drm_sysfs_device_release;
minor->kdev.devt = minor->device;
minor->kdev.type = &drm_sysfs_device_minor;
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;
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);
}
/**
* 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)
{
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);