linux-kernel - [PATCH 4/5] PNP: add framework for platform PNP quirks

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Date:	Wed, 08 Dec 2010 14:36:22 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <lenb@...nel.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Adam Belay <abelay@....edu>
Subject: [PATCH 4/5] PNP: add framework for platform PNP quirks


This allows platform quirks to fabricate PNP devices to describe things
that should have been described via ACPI.  For example, if the BIOS writer
forgets to describe a device, we may assign its address space to another
device, causing a conflict.  We can avoid the conflict by making a fake PNP
device to stand in for the one the BIOS missed.

In that case, there's no ACPI or PNPBIOS device, so we need a new
pnp_protocol that doesn't go back to firmware for get/set/wakeup/
suspend/etc.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
---

 drivers/pnp/base.h   |    2 ++
 drivers/pnp/core.c   |    9 ++++++++-
 drivers/pnp/quirks.c |   15 +++++++++++++++
 3 files changed, 25 insertions(+), 1 deletions(-)


diff --git a/drivers/pnp/base.h b/drivers/pnp/base.h
index 19bc736..dca301e 100644
--- a/drivers/pnp/base.h
+++ b/drivers/pnp/base.h
@@ -7,6 +7,8 @@ extern spinlock_t pnp_lock;
 extern struct device_attribute pnp_interface_attrs[];
 void *pnp_alloc(long size);
 
+void platform_pnp_fixups(void);
+
 int pnp_register_protocol(struct pnp_protocol *protocol);
 void pnp_unregister_protocol(struct pnp_protocol *protocol);
 
diff --git a/drivers/pnp/core.c b/drivers/pnp/core.c
index 0f34d96..5076493 100644
--- a/drivers/pnp/core.c
+++ b/drivers/pnp/core.c
@@ -212,7 +212,14 @@ void __pnp_remove_device(struct pnp_dev *dev)
 
 static int __init pnp_init(void)
 {
-	return bus_register(&pnp_bus_type);
+	int ret;
+
+	ret = bus_register(&pnp_bus_type);
+	if (ret)
+		return ret;
+
+	platform_pnp_fixups();
+	return 0;
 }
 
 subsys_initcall(pnp_init);
diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index dfbd5a6..f18bb69 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -15,6 +15,7 @@
 
 #include <linux/types.h>
 #include <linux/kernel.h>
+#include <linux/dmi.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/pnp.h>
@@ -337,3 +338,17 @@ void pnp_fixup_device(struct pnp_dev *dev)
 		f->quirk_function(dev);
 	}
 }
+
+static struct pnp_protocol pnp_fixup_protocol = {
+	.name = "Plug and Play fixup",
+};
+
+static const struct dmi_system_id pnp_fixup_table[] __initconst = {
+	{}
+};
+
+void __init platform_pnp_fixups(void)
+{
+	pnp_register_protocol(&pnp_fixup_protocol);
+	dmi_check_system(pnp_fixup_table);
+}

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