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b0e898ac55
So I've stumbled over drm_fasync and wondered what it does. Digging
that up is quite a story.
First I've had to read up on what this does and ended up being rather
bewildered why peopled loved signals so much back in the days that
they've created SIGIO just for that ...
Then I wondered how this ever works, and what that strange "No-op."
comment right above it should mean. After all calling the core fasync
helper is pretty obviously not a noop. After reading through the
kernels FASYNC implementation I've noticed that signals are only sent
out to the processes attached with FASYNC by calling kill_fasync.
No merged drm driver has ever done that.
After more digging I've found out that the only driver that ever used
this is the so called GAMMA driver. I've frankly never heard of such a
gpu brand ever before. Now FASYNC seems to not have been the only bad
thing with that driver, since Dave Airlie removed it from the drm
driver with prejudice:
commit 1430163b4bbf7b00367ea1066c1c5fe85dbeefed
Author: Dave Airlie <airlied@linux.ie>
Date: Sun Aug 29 12:04:35 2004 +0000
Drop GAMMA DRM from a great height ...
Long story short, the drm fasync support seems to be doing absolutely
nothing. And the only user of it was never merged into the upstream
kernel. And we don't need any fops->fasync callback since the fcntl
implementation in the kernel already implements the noop case
correctly.
So stop this particular cargo-cult and rip it all out.
v2: Kill drm_fasync assignments in rcar (newly added) and imx drivers
(somehow I've missed that one in staging). Also drop the reference in
the drm DocBook. ARM compile-fail reported by Rob Clark.
v3: Move the removal of dev->buf_asnyc assignment in drm_setup to this
patch here.
v4: Actually git add ... tsk.
Cc: Dave Airlie <airlied@linux.ie>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Rob Clark <robdclark@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*
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* Copyright (C) 2012 Red Hat
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License v2. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <drm/drm_usb.h>
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#include <drm/drm_crtc_helper.h>
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#include "udl_drv.h"
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static struct drm_driver driver;
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/*
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* There are many DisplayLink-based graphics products, all with unique PIDs.
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* So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
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* We also require a match on SubClass (0x00) and Protocol (0x00),
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* which is compatible with all known USB 2.0 era graphics chips and firmware,
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* but allows DisplayLink to increment those for any future incompatible chips
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*/
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static struct usb_device_id id_table[] = {
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{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
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.bInterfaceSubClass = 0x00,
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.bInterfaceProtocol = 0x00,
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR |
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USB_DEVICE_ID_MATCH_INT_CLASS |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS |
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USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
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{},
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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MODULE_LICENSE("GPL");
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static int udl_usb_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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return drm_get_usb_dev(interface, id, &driver);
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}
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static void udl_usb_disconnect(struct usb_interface *interface)
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{
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struct drm_device *dev = usb_get_intfdata(interface);
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drm_kms_helper_poll_disable(dev);
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drm_connector_unplug_all(dev);
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udl_fbdev_unplug(dev);
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udl_drop_usb(dev);
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drm_unplug_dev(dev);
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}
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static const struct vm_operations_struct udl_gem_vm_ops = {
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.fault = udl_gem_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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static const struct file_operations udl_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.mmap = udl_drm_gem_mmap,
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.poll = drm_poll,
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.read = drm_read,
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.unlocked_ioctl = drm_ioctl,
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.release = drm_release,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = drm_compat_ioctl,
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#endif
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.llseek = noop_llseek,
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};
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static struct drm_driver driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
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.load = udl_driver_load,
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.unload = udl_driver_unload,
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/* gem hooks */
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.gem_init_object = udl_gem_init_object,
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.gem_free_object = udl_gem_free_object,
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.gem_vm_ops = &udl_gem_vm_ops,
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.dumb_create = udl_dumb_create,
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.dumb_map_offset = udl_gem_mmap,
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.dumb_destroy = drm_gem_dumb_destroy,
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.fops = &udl_driver_fops,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_prime_import = udl_gem_prime_import,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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.patchlevel = DRIVER_PATCHLEVEL,
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};
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static struct usb_driver udl_driver = {
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.name = "udl",
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.probe = udl_usb_probe,
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.disconnect = udl_usb_disconnect,
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.id_table = id_table,
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};
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static int __init udl_init(void)
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{
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return drm_usb_init(&driver, &udl_driver);
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}
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static void __exit udl_exit(void)
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{
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drm_usb_exit(&driver, &udl_driver);
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}
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module_init(udl_init);
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module_exit(udl_exit);
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