linux-kernel - [PATCH 9/9] I2C/ACPI: Add CONFIG_I2C

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Date:	Wed, 16 Apr 2014 21:24:42 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	wsa@...-dreams.de, rjw@...ysocki.net, lenb@...nel.org,
	mika.westerberg@...ux.intel.com, awilliam@...hat.com,
	tianyu.lan@...el.com
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config

This patch is to add CONFIG_I2C_ACPI. Current there is a race between
removing I2C ACPI operation region and ACPI AML code accessing.
So make i2c core built-in if CONFIG_I2C_ACPI is set. The race will
be fixed later in the ACPICA.

Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
---
 drivers/i2c/Kconfig  | 16 +++++++++++++++-
 drivers/i2c/Makefile |  2 +-
 include/linux/i2c.h  |  2 +-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 7b7ea32..15d782e 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -2,7 +2,9 @@
 # I2C subsystem configuration
 #
 
-menuconfig I2C
+menu "I2C support"
+
+config I2C
 	tristate "I2C support"
 	select RT_MUTEXES
 	---help---
@@ -21,6 +23,16 @@ menuconfig I2C
 	  This I2C support can also be built as a module.  If so, the module
 	  will be called i2c-core.
 
+config I2C_ACPI
+	bool "I2C ACPI support"
+	select I2C
+	depends on ACPI
+	help
+	  Say Y here if you want to enable I2C ACPI function. ACPI table
+	  provides I2C slave devices' information to enumerate these devices.
+	  This option also allows ACPI AML code to access I2C slave devices
+	  via I2C ACPI operation region to fulfill ACPI method.
+
 if I2C
 
 config I2C_BOARDINFO
@@ -124,3 +136,5 @@ config I2C_DEBUG_BUS
 	  on.
 
 endif # I2C
+
+endmenu
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 80db307..37464ee 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -3,7 +3,7 @@
 #
 
 i2ccore-y := i2c-core.o
-i2ccore-$(CONFIG_ACPI)		+= i2c-acpi.o
+i2ccore-$(CONFIG_I2C_ACPI)		+= i2c-acpi.o
 
 obj-$(CONFIG_I2C_BOARDINFO)	+= i2c-boardinfo.o
 obj-$(CONFIG_I2C)		+= i2ccore.o
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fc1ef42..d0ece9f 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -583,7 +583,7 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node
 }
 #endif /* CONFIG_OF */
 
-#ifdef CONFIG_ACPI
+#ifdef CONFIG_I2C_ACPI
 int acpi_i2c_install_space_handler(struct i2c_adapter *adapter);
 void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter);
 void acpi_i2c_register_devices(struct i2c_adapter *adap);
-- 
1.8.4.rc0.1.g8f6a3e5.dirty

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