[PATCH] Add Intel GMA500(Poulsbo) Stub Driver

[Zhang Rui]

Hi, Lee,

there are several regressions caused by this patch,
http://marc.info/?l=linux-acpi&m=128872402020412&w=2
http://marc.info/?l=linux-acpi&m=128858111022621&w=2

Yes, We can fix it by "select INPUT if ACPI"/"select
VIDEO_OUTPUT_CONTROL if ACPI".
But IMO,  STUB_POULSBO should not select ACPI_VIDEO at all,
what do you think?

thanks,
rui

On Wed, 2010-11-03 at 09:19 +0800, Zhang Rui wrote:
> Hi, Lee,
> 
> Sorry I missed this thread.
> 
> On Wed, 2010-10-20 at 13:51 +0800, Lee, Chun-Yi wrote:
> > Currently, there have no GMA500(Poulsbo) native video driver to support
> > intel opregion. So, use this stub driver to enable the acpi backlight
> > control sysfs entry files by requrest acpi_video_register.
> > 
> If you want the acpi backlight control, why not set CONFIG_ACPI_VIDEO
> driver directly?
> The reason why i915 driver selects ACPI_VIDEO is that it needs some
> cooperation between these two drivers during initialization, or else the
> system may hang.
> 
> thanks,
> rui
> 
> > Signed-off-by: Lee, Chun-Yi <jlee at novell.com>
> > ---
> >  drivers/gpu/Makefile       |    2 +-
> >  drivers/gpu/stub/Kconfig   |   13 +++++++++
> >  drivers/gpu/stub/Makefile  |    1 +
> >  drivers/gpu/stub/poulsbo.c |   63 ++++++++++++++++++++++++++++++++++++++++++++
> >  drivers/video/Kconfig      |    2 +
> >  5 files changed, 80 insertions(+), 1 deletions(-)
> >  create mode 100644 drivers/gpu/stub/Kconfig
> >  create mode 100644 drivers/gpu/stub/Makefile
> >  create mode 100644 drivers/gpu/stub/poulsbo.c
> > 
> > diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
> > index 30879df..cc92778 100644
> > --- a/drivers/gpu/Makefile
> > +++ b/drivers/gpu/Makefile
> > @@ -1 +1 @@
> > -obj-y			+= drm/ vga/
> > +obj-y			+= drm/ vga/ stub/
> > diff --git a/drivers/gpu/stub/Kconfig b/drivers/gpu/stub/Kconfig
> > new file mode 100644
> > index 0000000..8f5a540
> > --- /dev/null
> > +++ b/drivers/gpu/stub/Kconfig
> > @@ -0,0 +1,13 @@
> > +config STUB_POULSBO
> > +	tristate "Intel GMA500 Stub Driver"
> > +	depends on PCI
> > +        # Poulsbo stub depends on ACPI_VIDEO when ACPI is enabled
> > +        # but for select to work, need to select ACPI_VIDEO's dependencies, ick
> > +        select ACPI_VIDEO if ACPI
> > +	help
> > +	  Choose this option if you have a system that has Intel GMA500
> > +	  (Poulsbo) integrated graphics. If M is selected, the module will
> > +	  be called Poulsbo. This driver is a stub driver for Poulsbo that
> > +	  will call poulsbo.ko to enable the acpi backlight control sysfs
> > +	  entry file because there have no poulsbo native driver can support
> > +	  intel opregion.
> > diff --git a/drivers/gpu/stub/Makefile b/drivers/gpu/stub/Makefile
> > new file mode 100644
> > index 0000000..cd940cc
> > --- /dev/null
> > +++ b/drivers/gpu/stub/Makefile
> > @@ -0,0 +1 @@
> > +obj-$(CONFIG_STUB_POULSBO) += poulsbo.o
> > diff --git a/drivers/gpu/stub/poulsbo.c b/drivers/gpu/stub/poulsbo.c
> > new file mode 100644
> > index 0000000..d8aa636
> > --- /dev/null
> > +++ b/drivers/gpu/stub/poulsbo.c
> > @@ -0,0 +1,63 @@
> > +/*
> > + * Intel Poulsbo Stub driver
> > + *
> > + * Copyright (C) 2010 Novell <jlee at novell.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License version 2 as published by
> > + * the Free Software Foundation.
> > + *
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/pci.h>
> > +#include <acpi/video.h>
> > +
> > +#define DRIVER_NAME "poulsbo"
> > +
> > +enum {
> > +	CHIP_PSB_8108 = 0,
> > +	CHIP_PSB_8109 = 1,
> > +};
> > +
> > +static struct pci_device_id pciidlist[] = {
> > +	{0x8086, 0x8108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_PSB_8108}, \
> > +	{0x8086, 0x8109, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_PSB_8109}, \
> > +	{0, 0, 0}
> > +};
> > +
> > +static int poulsbo_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > +{
> > +	return acpi_video_register();
> > +}
> > +
> > +static void poulsbo_remove(struct pci_dev *pdev)
> > +{
> > +	acpi_video_unregister();
> > +}
> > +
> > +static struct pci_driver poulsbo_driver = {
> > +	.name = DRIVER_NAME,
> > +	.id_table = pciidlist,
> > +	.probe = poulsbo_probe,
> > +	.remove = poulsbo_remove,
> > +};
> > +
> > +static int __init poulsbo_init(void)
> > +{
> > +	return pci_register_driver(&poulsbo_driver);
> > +}
> > +
> > +static void __exit poulsbo_exit(void)
> > +{
> > +	pci_unregister_driver(&poulsbo_driver);
> > +}
> > +
> > +module_init(poulsbo_init);
> > +module_exit(poulsbo_exit);
> > +
> > +MODULE_AUTHOR("Lee, Chun-Yi <jlee at novell.com>");
> > +MODULE_DESCRIPTION("Poulsbo Stub Driver");
> > +MODULE_LICENSE("GPL");
> > +
> > +MODULE_DEVICE_TABLE(pci, pciidlist);
> > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> > index 8b31fdf..8807ae5 100644
> > --- a/drivers/video/Kconfig
> > +++ b/drivers/video/Kconfig
> > @@ -17,6 +17,8 @@ source "drivers/gpu/vga/Kconfig"
> >  
> >  source "drivers/gpu/drm/Kconfig"
> >  
> > +source "drivers/gpu/stub/Kconfig"
> > +
> >  config VGASTATE
> >         tristate
> >         default n
>