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: Lukas Wunner <lukas@xxxxxxxxx>
[MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"]
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
---
Documentation/DocBook/gpu.tmpl | 4 ++++
drivers/platform/x86/apple-gmux.c | 3 ++-
include/linux/apple-gmux.h | 39 +++++++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+), 1 deletion(-)
create mode 100644 include/linux/apple-gmux.h
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
index 88e7c39..a5e6e3c 100644
--- a/Documentation/DocBook/gpu.tmpl
+++ b/Documentation/DocBook/gpu.tmpl
@@ -3677,6 +3677,10 @@ 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>
diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 1384a39..4034d2d 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -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}
};
diff --git a/include/linux/apple-gmux.h b/include/linux/apple-gmux.h
new file mode 100644
index 0000000..feebc28
--- /dev/null
+++ b/include/linux/apple-gmux.h
@@ -0,0 +1,39 @@
+/*
+ * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro
+ * Copyright (C) 2015 Lukas Wunner <lukas@xxxxxxxxx>
+ *
+ * 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 */
--
1.8.5.2 (Apple Git-48)
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