Browse files

Initial, working VGA switcheroo for Asus UL30VT

Note this is very experimental, use at your own risk.  I don't even
know what some of these calls are doing.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
  • Loading branch information...
0 parents commit 6007331596c45ac005a633e4f85eabb7701434a9 @awilliam committed Apr 14, 2011
Showing with 627 additions and 0 deletions.
  1. +356 −0 COPYING
  2. +10 −0 Makefile
  3. +261 −0 asus-ul30vt-switcheroo.c
356 COPYING
@@ -0,0 +1,356 @@
+
+ NOTE! This copyright does *not* cover user programs that use kernel
+ services by normal system calls - this is merely considered normal use
+ of the kernel, and does *not* fall under the heading of "derived work".
+ Also note that the GPL below is copyrighted by the Free Software
+ Foundation, but the instance of code that it refers to (the Linux
+ kernel) is copyrighted by me and others who actually wrote it.
+
+ Also note that the only valid version of the GPL as far as the kernel
+ is concerned is _this_ particular version of the license (ie v2, not
+ v2.2 or v3.x or whatever), unless explicitly otherwise stated.
+
+ Linus Torvalds
+
+----------------------------------------
+
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
10 Makefile
@@ -0,0 +1,10 @@
+obj-m := asus-ul30vt-switcheroo.o
+
+KDIR := /lib/modules/$(shell uname -r)/build
+PWD := $(shell pwd)
+
+default:
+ $(MAKE) -C $(KDIR) M=$(PWD) modules
+
+clean:
+ $(MAKE) -C $(KDIR) M=$(PWD) clean
261 asus-ul30vt-switcheroo.c
@@ -0,0 +1,261 @@
+/*
+ * VGA switcheroo driver for ASUS UL30VT (and possibly similar)
+ *
+ * Based on drivers/gpu/drm/nouveau/nouveau_acpi.c
+ *
+ * Copyright 2011 Red Hat, Inc
+ *
+ * Author: Alex Williamson <alex.williamson@redhat.com
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/video.h>
+#include <linux/vga_switcheroo.h>
+
+#define DSM_SUPPORTED 0x00
+#define DSM_SUPPORTED_FUNCTIONS 0x00
+
+#define DSM_LED 0x02
+#define DSM_LED_STATE 0x00
+#define DSM_LED_OFF 0x10
+#define DSM_LED_STAMINA 0x11
+#define DSM_LED_SPEED 0x12
+
+#define DSM_POWER 0x03
+#define DSM_POWER_STATE 0x00
+#define DSM_POWER_SPEED 0x01
+#define DSM_POWER_STAMINA 0x02
+
+static acpi_handle dsm_handle;
+static acpi_handle dis_handle;
+static acpi_handle igd_handle;
+
+static const char dsm_uuid[] = {
+ 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
+ 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
+};
+
+static int asus_ul30vt_dsm_call(acpi_handle handle, int func, int arg)
+{
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_object_list input;
+ union acpi_object params[4], elements[4];
+ union acpi_object *obj;
+ int i, err;
+
+ input.count = 4;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_BUFFER;
+ params[0].buffer.length = sizeof(dsm_uuid);
+ params[0].buffer.pointer = (char *)dsm_uuid;
+ params[1].type = ACPI_TYPE_INTEGER;
+ params[1].integer.value = 0; /* revision ID - unused */
+ params[2].type = ACPI_TYPE_INTEGER;
+ params[2].integer.value = func;
+ params[3].type = ACPI_TYPE_PACKAGE;
+ params[3].package.count = 4;
+ params[3].package.elements = elements;
+ for (i = 0; i < 4; i++) {
+ elements[i].type = ACPI_TYPE_INTEGER;
+ elements[i].integer.value = (arg >> (i * 8)) & 0xff;
+ }
+
+ err = acpi_evaluate_object(handle, "_DSM", &input, &output);
+ if (err) {
+ printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
+ return err;
+ }
+
+ obj = (union acpi_object *)output.pointer;
+
+ if (obj->type == ACPI_TYPE_INTEGER)
+ if (obj->integer.value == 0x80000002)
+ return -ENODEV;
+
+ kfree(output.pointer);
+ return 0;
+}
+
+static int asus_ul30vt_acpi_mux(acpi_handle handle)
+{
+ struct acpi_object_list input;
+ union acpi_object param;
+ int err;
+
+ input.count = 1;
+ input.pointer = &param;
+ param.type = ACPI_TYPE_INTEGER;
+ param.integer.value = 1;
+
+ /* I don't really know what these do, but it seems to work */
+ err = acpi_evaluate_object(handle, "MXMX", &input, NULL);
+ if (err) {
+ printk(KERN_INFO "failed to evaluate MXMX: %d\n", err);
+ return err;
+ }
+
+ err = acpi_evaluate_object(handle, "MXDS", &input, NULL);
+ if (err) {
+ printk(KERN_INFO "failed to evaluate MXMX: %d\n", err);
+ return err;
+ }
+ return 0;
+}
+
+static int asus_ul30vt_dsm_switchto(enum vga_switcheroo_client_id id)
+{
+ int dsm_arg;
+
+ if (id == VGA_SWITCHEROO_IGD) {
+ asus_ul30vt_acpi_mux(igd_handle);
+ dsm_arg = DSM_LED_STAMINA;
+ } else {
+ asus_ul30vt_acpi_mux(dis_handle);
+ dsm_arg = DSM_LED_SPEED;
+ }
+
+ return asus_ul30vt_dsm_call(dsm_handle, DSM_LED, dsm_arg);
+}
+
+static int asus_ul30vt_dsm_power_state(enum vga_switcheroo_client_id id,
+ enum vga_switcheroo_state state)
+{
+ int dsm_arg;
+
+ if (id == VGA_SWITCHEROO_IGD)
+ return 0;
+
+ if (state == VGA_SWITCHEROO_ON)
+ dsm_arg = DSM_POWER_SPEED;
+ else
+ dsm_arg = DSM_POWER_STAMINA;
+
+ return asus_ul30vt_dsm_call(dsm_handle, DSM_POWER, dsm_arg);
+}
+
+static int asus_ul30vt_dsm_init(void)
+{
+ return 0;
+}
+
+static int asus_ul30vt_dsm_get_client_id(struct pci_dev *pdev)
+{
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+ return VGA_SWITCHEROO_IGD;
+
+ return VGA_SWITCHEROO_DIS;
+}
+
+static struct vga_switcheroo_handler asus_ul30vt_dsm_handler = {
+ .switchto = asus_ul30vt_dsm_switchto,
+ .power_state = asus_ul30vt_dsm_power_state,
+ .init = asus_ul30vt_dsm_init,
+ .get_client_id = asus_ul30vt_dsm_get_client_id,
+};
+
+static bool asus_ul30vt_dsm_pci_probe(struct pci_dev *pdev)
+{
+ acpi_handle handle, test_handle;
+ acpi_status status;
+ int ret;
+
+ handle = DEVICE_ACPI_HANDLE(&pdev->dev);
+ if (!handle)
+ return false;
+
+ status = acpi_get_handle(handle, "_DSM", &test_handle);
+ if (ACPI_FAILURE(status)) {
+ return false;
+ }
+
+ ret = asus_ul30vt_dsm_call(handle, DSM_SUPPORTED,
+ DSM_SUPPORTED_FUNCTIONS);
+ if (ret < 0)
+ return false;
+
+ status = acpi_get_handle(handle, "MXMX", &test_handle);
+ if (ACPI_FAILURE(status)) {
+ return false;
+ }
+
+ status = acpi_get_handle(handle, "MXDS", &test_handle);
+ if (ACPI_FAILURE(status)) {
+ return false;
+ }
+
+ dsm_handle = handle;
+ return true;
+}
+
+static bool asus_ul30vt_dsm_detect(void)
+{
+ struct pci_dev *pdev = NULL;
+ int class = PCI_CLASS_DISPLAY_VGA << 8;
+ int vga_count = 0;
+
+ while ((pdev = pci_get_class(class, pdev)) != NULL) {
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_handle handle;
+
+ vga_count++;
+
+ /* The _DSM actually exists on both devices on this system */
+ if (!asus_ul30vt_dsm_pci_probe(pdev))
+ return false;
+
+ handle = DEVICE_ACPI_HANDLE(&pdev->dev);
+ if (!handle)
+ return false;
+
+ if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+ igd_handle = handle;
+ else
+ dis_handle = handle;
+
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf);
+ printk(KERN_INFO "Found VGA device %s (%s): %s\n",
+ dev_name(&pdev->dev), (char *)buf.pointer,
+ pdev->vendor == PCI_VENDOR_ID_INTEL ? "IGD" : "DIS");
+ kfree(buf.pointer);
+ }
+
+ if (vga_count == 2 && dsm_handle && igd_handle && dis_handle) {
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ acpi_get_name(dsm_handle, ACPI_FULL_PATHNAME, &buf);
+ printk(KERN_INFO
+ "UL30VT switcheroo: detected DSM switching method "
+ "%s handle\n", (char *)buf.pointer);
+ kfree(buf.pointer);
+ return true;
+ }
+ return false;
+}
+
+static int __init asus_ul30vt_register_dsm_handler(void)
+{
+ if (!asus_ul30vt_dsm_detect())
+ return 0;
+
+ vga_switcheroo_register_handler(&asus_ul30vt_dsm_handler);
+ return 0;
+}
+
+static void __exit asus_ul30vt_unregister_dsm_handler(void)
+{
+ vga_switcheroo_unregister_handler();
+}
+
+module_init(asus_ul30vt_register_dsm_handler);
+module_exit(asus_ul30vt_unregister_dsm_handler);
+
+MODULE_AUTHOR("Alex Williamson <alex.williamson@redhat.com>");
+MODULE_DESCRIPTION("Experimental Asus UL30VT hybrid graphics switcheroo");
+MODULE_LICENSE("GPL");

0 comments on commit 6007331

Please sign in to comment.