Commit 2413306c authored by Lukas Wunner's avatar Lukas Wunner Committed by Daniel Vetter
Browse files

apple-gmux: Add helper for presence detect 



Centralize gmux' ACPI HID in a header file and add apple_gmux_present().
This can be used by other drivers to activate quirks specific to dual
GPU MacBook Pros & Mac Pros. The alternative would be to hardcode DMI
or PCI IDs and amend them whenever Apple introduces a new machine.

Tested-by: default avatarLukas Wunner <lukas@wunner.de>
    [MBP  9,1 2012  intel IVB + nvidia GK107  pre-retina  15"]
Signed-off-by: default avatarLukas Wunner <lukas@wunner.de>
Reviewed-by: default avatarDarren Hart <dvhart@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/89c23769058a340e5e11d4a7102f3793d3b0c94c.1452525860.git.lukas@wunner.de
parent 47eb8f73

Documentation/DocBook/gpu.tmpl

+4 −0
Original line number Diff line number Diff line
@@ -3451,6 +3451,10 @@ int num_ioctls;</synopsis> 
        <title>Backlight control</title>

!Pdrivers/platform/x86/apple-gmux.c Backlight control

      </sect2>

      <sect2>

        <title>Public functions</title>

!Iinclude/linux/apple-gmux.h

      </sect2>

    </sect1>

  </chapter>

drivers/platform/x86/apple-gmux.c

+2 −1
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/acpi.h>

#include <linux/pnp.h>

#include <linux/apple_bl.h>

#include <linux/apple-gmux.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/pci.h>
@@ -828,7 +829,7 @@ static void gmux_remove(struct pnp_dev *pnp) 
}



static const struct pnp_device_id gmux_device_ids[] = {

	{"APP000B", 0},

	{GMUX_ACPI_HID, 0},

	{"", 0}

};

include/linux/apple-gmux.h

0 → 100644
+39 −0
Original line number Diff line number Diff line 
/*

 * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro

 * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de>

 *

 * 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.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */



#ifndef LINUX_APPLE_GMUX_H

#define LINUX_APPLE_GMUX_H



#include <linux/acpi.h>



#define GMUX_ACPI_HID "APP000B"



/**

 * apple_gmux_present() - detect if gmux is built into the machine

 *

 * Drivers may use this to activate quirks specific to dual GPU MacBook Pros

 * and Mac Pros, e.g. for deferred probing, runtime pm and backlight.

 *

 * Return: %true if gmux is present and the kernel was configured

 * with CONFIG_APPLE_GMUX, %false otherwise.

 */

static inline bool apple_gmux_present(void)

{

	return IS_ENABLED(CONFIG_APPLE_GMUX) && acpi_dev_present(GMUX_ACPI_HID);

}



#endif /* LINUX_APPLE_GMUX_H */

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