drm/linux-core/drm_sysfs.c

401 lines
10 KiB
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)
/**
* 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;
printk(KERN_ERR "%s\n", __FUNCTION__);
if (drm_minor->type == DRM_MINOR_CONTROL)
if (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_CONTROL)
if (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;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22))
class->suspend = drm_sysfs_suspend;
class->resume = drm_sysfs_resume;
#endif
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);
}
static ssize_t show_dri(struct device *device, struct device_attribute *attr,
char *buf)
{
struct drm_minor *drm_minor = to_drm_minor(device);
struct drm_device *drm_dev = drm_minor->dev;
if (drm_dev->driver->dri_library_name)
return drm_dev->driver->dri_library_name(drm_dev, buf);
return snprintf(buf, PAGE_SIZE, "%s\n", drm_dev->driver->pci_driver.name);
}
/**
* 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;
}
/*
* Output properties
*/
static ssize_t status_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_output *output = container_of(device, struct drm_output, kdev);
return snprintf(buf, PAGE_SIZE, "%s",
drm_get_output_status_name(output->funcs->detect(output)));
}
static ssize_t dpms_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_output *output = container_of(device, struct drm_output, kdev);
struct drm_device *dev = output->dev;
uint64_t dpms_status;
int ret;
ret = drm_output_property_get_value(output,
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 edid_show(struct kobject *kobj, struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct device *output_dev = container_of(kobj, struct device, kobj);
struct drm_output *output = container_of(output_dev, struct drm_output,
kdev);
unsigned char *edid;
size_t size;
if (!output->edid_blob_ptr)
return 0;
edid = output->edid_blob_ptr->data;
size = output->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_output *output = container_of(device, struct drm_output, kdev);
struct drm_display_mode *mode;
int written = 0;
list_for_each_entry(mode, &output->modes, head) {
written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
mode->name);
}
return written;
}
static struct device_attribute output_attrs[] = {
__ATTR_RO(status),
__ATTR_RO(dpms),
__ATTR_RO(modes),
};
static struct bin_attribute edid_attr = {
.attr.name = "edid",
.size = 128,
.read = edid_show,
};
/**
* drm_sysfs_output_add - add an output to sysfs
* @output: output to add
*
* Create an output device in sysfs, along with its associated output
* properties (so far, connection status, dpms, mode list & edid) and
* generate a hotplug event so userspace knows there's a new output
* available.
*/
int drm_sysfs_output_add(struct drm_output *output)
{
struct drm_device *dev = output->dev;
int ret = 0, i, j;
if (device_is_registered(&output->kdev))
return 0;
output->kdev.parent = &dev->primary->kdev;
output->kdev.class = drm_class;
output->kdev.release = drm_sysfs_device_release;
DRM_DEBUG("adding \"%s\" to sysfs\n", drm_get_output_name(output));
snprintf(output->kdev.bus_id, BUS_ID_SIZE, "card%d-%s",
dev->primary->index, drm_get_output_name(output));
ret = device_register(&output->kdev);
if (ret) {
DRM_ERROR("failed to register output device: %d\n", ret);
goto out;
}
for (i = 0; i < ARRAY_SIZE(output_attrs); i++) {
ret = device_create_file(&output->kdev, &output_attrs[i]);
if (ret)
goto err_out_files;
}
ret = sysfs_create_bin_file(&output->kdev.kobj, &edid_attr);
if (ret)
goto err_out_files;
/* Let userspace know we have a new output */
drm_sysfs_hotplug_event(dev);
return 0;
err_out_files:
if (i > 0)
for (j = 0; j < i; j++)
device_remove_file(&output->kdev, &output_attrs[i]);
device_unregister(&output->kdev);
out:
return ret;
}
EXPORT_SYMBOL(drm_sysfs_output_add);
/**
* drm_sysfs_output_remove - remove an output device from sysfs
* @output: output to remove
*
* Remove @output 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.
*/
void drm_sysfs_output_remove(struct drm_output *output)
{
int i;
DRM_DEBUG("removing \"%s\" from sysfs\n", drm_get_output_name(output));
for (i = 0; i < ARRAY_SIZE(output_attrs); i++)
device_remove_file(&output->kdev, &output_attrs[i]);
sysfs_remove_bin_file(&output->kdev.kobj, &edid_attr);
device_unregister(&output->kdev);
}
EXPORT_SYMBOL(drm_sysfs_output_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);
}
static struct device_attribute dri_attrs[] = {
__ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
};
/**
* 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;
int i, j;
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";
snprintf(minor->kdev.bus_id, BUS_ID_SIZE, minor_str, minor->index);
err = device_register(&minor->kdev);
if (err) {
DRM_ERROR("device add failed: %d\n", err);
goto err_out;
}
for (i = 0; i < ARRAY_SIZE(dri_attrs); i++) {
err = device_create_file(&minor->kdev, &dri_attrs[i]);
if (err)
goto err_out_files;
}
return 0;
err_out_files:
if (i > 0)
for (j = 0; j < i; j++)
device_remove_file(&minor->kdev, &dri_attrs[i]);
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)
{
int i;
for (i = 0; i < ARRAY_SIZE(dri_attrs); i++)
device_remove_file(&minor->kdev, &dri_attrs[i]);
device_unregister(&minor->kdev);
}