diff options
Diffstat (limited to 'drivers/gpu/drm/drm_sysfs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_sysfs.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c new file mode 100644 index 00000000000..af211a0ef17 --- /dev/null +++ b/drivers/gpu/drm/drm_sysfs.c @@ -0,0 +1,208 @@ + +/* + * 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; + + 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_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); +} + +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); +} + +static struct device_attribute device_attrs[] = { + __ATTR(dri_library_name, S_IRUGO, show_dri, NULL), +}; + +/** + * 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; +} + +/** + * 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; + 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(device_attrs); i++) { + err = device_create_file(&minor->kdev, &device_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, &device_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(device_attrs); i++) + device_remove_file(&minor->kdev, &device_attrs[i]); + device_unregister(&minor->kdev); +} |