Merge branch 'linus' into sched/core

Conflicts:
	kernel/Makefile

16 files changed, 1832 insertions, 44 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 9494400e8fd..fee7304102a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -227,10 +227,20 @@ config HP_WMI
          To compile this driver as a module, choose M here: the module will
          be called hp-wmi.
 
+config ICS932S401
+	tristate "Integrated Circuits ICS932S401"
+	depends on I2C && EXPERIMENTAL
+	help
+	  If you say yes here you get support for the Integrated Circuits
+	  ICS932S401 clock control chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called ics932s401.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86
-        depends on ACPI_EC
+        depends on ACPI
         depends on BACKLIGHT_CLASS_DEVICE
         ---help---
 	  This is a driver for laptops built by MSI (MICRO-STAR
@@ -260,7 +270,7 @@ config PANASONIC_LAPTOP
 config COMPAL_LAPTOP
 	tristate "Compal Laptop Extras"
 	depends on X86
-	depends on ACPI_EC
+	depends on ACPI
 	depends on BACKLIGHT_CLASS_DEVICE
 	---help---
 	  This is a driver for laptops built by Compal:
@@ -488,4 +498,6 @@ config SGI_GRU_DEBUG
 	This option enables addition debugging code for the SGI GRU driver. If
 	you are unsure, say N.
 
+source "drivers/misc/c2port/Kconfig"
+
 endif # MISC_DEVICES
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 909e2468cdc..817f7f5ab3b 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_ATMEL_PWM)		+= atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)		+= atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)	+= atmel_tclib.o
 obj-$(CONFIG_HP_WMI)		+= hp-wmi.o
+obj-$(CONFIG_ICS932S401)	+= ics932s401.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
@@ -31,3 +32,4 @@ obj-$(CONFIG_KGDB_TESTS)	+= kgdbts.o
 obj-$(CONFIG_SGI_XP)		+= sgi-xp/
 obj-$(CONFIG_SGI_GRU)		+= sgi-gru/
 obj-$(CONFIG_HP_ILO)		+= hpilo.o
+obj-$(CONFIG_C2PORT)		+= c2port/
diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index 0532a2de2ce..94c9f911824 100644
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -1297,6 +1297,12 @@ static int __init acer_wmi_init(void)
 
 	set_quirks();
 
+	if (!acpi_video_backlight_support() && has_cap(ACER_CAP_BRIGHTNESS)) {
+		interface->capability &= ~ACER_CAP_BRIGHTNESS;
+		printk(ACER_INFO "Brightness must be controlled by "
+		       "generic video driver\n");
+	}
+
 	if (platform_driver_register(&acer_platform_driver)) {
 		printk(ACER_ERR "Unable to register platform driver.\n");
 		goto error_platform_register;
diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c
index a9d5228724a..8fb8b359104 100644
--- a/drivers/misc/asus-laptop.c
+++ b/drivers/misc/asus-laptop.c
@@ -1208,9 +1208,13 @@ static int __init asus_laptop_init(void)
 
 	dev = acpi_get_physical_device(hotk->device->handle);
 
-	result = asus_backlight_init(dev);
-	if (result)
-		goto fail_backlight;
+	if (!acpi_video_backlight_support()) {
+		result = asus_backlight_init(dev);
+		if (result)
+			goto fail_backlight;
+	} else
+		printk(ASUS_INFO "Brightness ignored, must be controlled by "
+		       "ACPI video driver\n");
 
 	result = asus_led_init(dev);
 	if (result)
diff --git a/drivers/misc/c2port/Kconfig b/drivers/misc/c2port/Kconfig
new file mode 100644
index 00000000000..e46af9a5810
--- /dev/null
+++ b/drivers/misc/c2port/Kconfig
@@ -0,0 +1,35 @@
+#
+# C2 port devices
+#
+
+menuconfig C2PORT
+	tristate "Silicon Labs C2 port support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
+	default no
+	help
+	  This option enables support for Silicon Labs C2 port used to
+	  program Silicon micro controller chips (and other 8051 compatible).
+
+	  If your board have no such micro controllers you don't need this
+	  interface at all.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called c2port_core. Note that you also need a client module
+	  usually called c2port-*.
+
+	  If you are not sure, say N here.
+
+if C2PORT
+
+config C2PORT_DURAMAR_2150
+	tristate "C2 port support for Eurotech's Duramar 2150 (EXPERIMENTAL)"
+	depends on X86 && C2PORT
+	default no
+	help
+	  This option enables C2 support for the Eurotech's Duramar 2150
+	  on board micro controller.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called c2port-duramar2150.
+
+endif # C2PORT
diff --git a/drivers/misc/c2port/Makefile b/drivers/misc/c2port/Makefile
new file mode 100644
index 00000000000..3b2cf43d60f
--- /dev/null
+++ b/drivers/misc/c2port/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_C2PORT)		+= core.o
+
+obj-$(CONFIG_C2PORT_DURAMAR_2150)	+= c2port-duramar2150.o
diff --git a/drivers/misc/c2port/c2port-duramar2150.c b/drivers/misc/c2port/c2port-duramar2150.c
new file mode 100644
index 00000000000..338dcc12150
--- /dev/null
+++ b/drivers/misc/c2port/c2port-duramar2150.c
@@ -0,0 +1,158 @@
+/*
+ *  Silicon Labs C2 port Linux support for Eurotech Duramar 2150
+ *
+ *  Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
+ *  Copyright (c) 2008 Eurotech S.p.A. <info@eurotech.it>
+ *
+ * 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/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/c2port.h>
+
+#define DATA_PORT	0x325
+#define DIR_PORT	0x326
+#define    C2D		   (1 << 0)
+#define    C2CK		   (1 << 1)
+
+static DEFINE_MUTEX(update_lock);
+
+/*
+ * C2 port operations
+ */
+
+static void duramar2150_c2port_access(struct c2port_device *dev, int status)
+{
+	u8 v;
+
+	mutex_lock(&update_lock);
+
+	v = inb(DIR_PORT);
+
+	/* 0 = input, 1 = output */
+	if (status)
+		outb(v | (C2D | C2CK), DIR_PORT);
+	else
+		/* When access is "off" is important that both lines are set
+		 * as inputs or hi-impedence */
+		outb(v & ~(C2D | C2CK), DIR_PORT);
+
+	mutex_unlock(&update_lock);
+}
+
+static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir)
+{
+	u8 v;
+
+	mutex_lock(&update_lock);
+
+	v = inb(DIR_PORT);
+
+	if (dir)
+		outb(v & ~C2D, DIR_PORT);
+	else
+		outb(v | C2D, DIR_PORT);
+
+	mutex_unlock(&update_lock);
+}
+
+static int duramar2150_c2port_c2d_get(struct c2port_device *dev)
+{
+	return inb(DATA_PORT) & C2D;
+}
+
+static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status)
+{
+	u8 v;
+
+	mutex_lock(&update_lock);
+
+	v = inb(DATA_PORT);
+
+	if (status)
+		outb(v | C2D, DATA_PORT);
+	else
+		outb(v & ~C2D, DATA_PORT);
+
+	mutex_unlock(&update_lock);
+}
+
+static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status)
+{
+	u8 v;
+
+	mutex_lock(&update_lock);
+
+	v = inb(DATA_PORT);
+
+	if (status)
+		outb(v | C2CK, DATA_PORT);
+	else
+		outb(v & ~C2CK, DATA_PORT);
+
+	mutex_unlock(&update_lock);
+}
+
+static struct c2port_ops duramar2150_c2port_ops = {
+	.block_size	= 512,	/* bytes */
+	.blocks_num	= 30,	/* total flash size: 15360 bytes */
+
+	.access		= duramar2150_c2port_access,
+	.c2d_dir	= duramar2150_c2port_c2d_dir,
+	.c2d_get	= duramar2150_c2port_c2d_get,
+	.c2d_set	= duramar2150_c2port_c2d_set,
+	.c2ck_set	= duramar2150_c2port_c2ck_set,
+};
+
+static struct c2port_device *duramar2150_c2port_dev;
+
+/*
+ * Module stuff
+ */
+
+static int __init duramar2150_c2port_init(void)
+{
+	struct resource *res;
+	int ret = 0;
+
+	res = request_region(0x325, 2, "c2port");
+	if (!res)
+		return -EBUSY;
+
+	duramar2150_c2port_dev = c2port_device_register("uc",
+					&duramar2150_c2port_ops, NULL);
+	if (!duramar2150_c2port_dev) {
+		ret = -ENODEV;
+		goto free_region;
+	}
+
+	return 0;
+
+free_region:
+	release_region(0x325, 2);
+	return ret;
+}
+
+static void __exit duramar2150_c2port_exit(void)
+{
+	/* Setup the GPIOs as input by default (access = 0) */
+	duramar2150_c2port_access(duramar2150_c2port_dev, 0);
+
+	c2port_device_unregister(duramar2150_c2port_dev);
+
+	release_region(0x325, 2);
+}
+
+module_init(duramar2150_c2port_init);
+module_exit(duramar2150_c2port_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
new file mode 100644
index 00000000000..0207dd59090
--- /dev/null
+++ b/drivers/misc/c2port/core.c
@@ -0,0 +1,1003 @@
+/*
+ *  Silicon Labs C2 port core Linux support
+ *
+ *  Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
+ *  Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
+ *
+ * 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/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/idr.h>
+#include <linux/sched.h>
+
+#include <linux/c2port.h>
+
+#define DRIVER_NAME             "c2port"
+#define DRIVER_VERSION          "0.51.0"
+
+static DEFINE_SPINLOCK(c2port_idr_lock);
+static DEFINE_IDR(c2port_idr);
+
+/*
+ * Local variables
+ */
+
+static struct class *c2port_class;
+
+/*
+ * C2 registers & commands defines
+ */
+
+/* C2 registers */
+#define C2PORT_DEVICEID		0x00
+#define C2PORT_REVID		0x01
+#define C2PORT_FPCTL		0x02
+#define C2PORT_FPDAT		0xB4
+
+/* C2 interface commands */
+#define C2PORT_GET_VERSION	0x01
+#define C2PORT_DEVICE_ERASE	0x03
+#define C2PORT_BLOCK_READ	0x06
+#define C2PORT_BLOCK_WRITE	0x07
+#define C2PORT_PAGE_ERASE	0x08
+
+/* C2 status return codes */
+#define C2PORT_INVALID_COMMAND	0x00
+#define C2PORT_COMMAND_FAILED	0x02
+#define C2PORT_COMMAND_OK	0x0d
+
+/*
+ * C2 port low level signal managements
+ */
+
+static void c2port_reset(struct c2port_device *dev)
+{
+	struct c2port_ops *ops = dev->ops;
+
+	/* To reset the device we have to keep clock line low for at least
+	 * 20us.
+	 */
+	local_irq_disable();
+	ops->c2ck_set(dev, 0);
+	udelay(25);
+	ops->c2ck_set(dev, 1);
+	local_irq_enable();
+
+	udelay(1);
+}
+
+static void c2port_strobe_ck(struct c2port_device *dev)
+{
+	struct c2port_ops *ops = dev->ops;
+
+	/* During hi-low-hi transition we disable local IRQs to avoid
+	 * interructions since C2 port specification says that it must be
+	 * shorter than 5us, otherwise the microcontroller may consider
+	 * it as a reset signal!
+	 */
+	local_irq_disable();
+	ops->c2ck_set(dev, 0);
+	udelay(1);
+	ops->c2ck_set(dev, 1);
+	local_irq_enable();
+
+	udelay(1);
+}
+
+/*
+ * C2 port basic functions
+ */
+
+static void c2port_write_ar(struct c2port_device *dev, u8 addr)
+{
+	struct c2port_ops *ops = dev->ops;
+	int i;
+
+	/* START field */
+	c2port_strobe_ck(dev);
+
+	/* INS field (11b, LSB first) */
+	ops->c2d_dir(dev, 0);
+	ops->c2d_set(dev, 1);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 1);
+	c2port_strobe_ck(dev);
+
+	/* ADDRESS field */
+	for (i = 0; i < 8; i++) {
+		ops->c2d_set(dev, addr & 0x01);
+		c2port_strobe_ck(dev);
+
+		addr >>= 1;
+	}
+
+	/* STOP field */
+	ops->c2d_dir(dev, 1);
+	c2port_strobe_ck(dev);
+}
+
+static int c2port_read_ar(struct c2port_device *dev, u8 *addr)
+{
+	struct c2port_ops *ops = dev->ops;
+	int i;
+
+	/* START field */
+	c2port_strobe_ck(dev);
+
+	/* INS field (10b, LSB first) */
+	ops->c2d_dir(dev, 0);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 1);
+	c2port_strobe_ck(dev);
+
+	/* ADDRESS field */
+	ops->c2d_dir(dev, 1);
+	*addr = 0;
+	for (i = 0; i < 8; i++) {
+		*addr >>= 1;	/* shift in 8-bit ADDRESS field LSB first */
+
+		c2port_strobe_ck(dev);
+		if (ops->c2d_get(dev))
+			*addr |= 0x80;
+	}
+
+	/* STOP field */
+	c2port_strobe_ck(dev);
+
+	return 0;
+}
+
+static int c2port_write_dr(struct c2port_device *dev, u8 data)
+{
+	struct c2port_ops *ops = dev->ops;
+	int timeout, i;
+
+	/* START field */
+	c2port_strobe_ck(dev);
+
+	/* INS field (01b, LSB first) */
+	ops->c2d_dir(dev, 0);
+	ops->c2d_set(dev, 1);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+
+	/* LENGTH field (00b, LSB first -> 1 byte) */
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+
+	/* DATA field */
+	for (i = 0; i < 8; i++) {
+		ops->c2d_set(dev, data & 0x01);
+		c2port_strobe_ck(dev);
+
+		data >>= 1;
+	}
+
+	/* WAIT field */
+	ops->c2d_dir(dev, 1);
+	timeout = 20;
+	do {
+		c2port_strobe_ck(dev);
+		if (ops->c2d_get(dev))
+			break;
+
+		udelay(1);
+	} while (--timeout > 0);
+	if (timeout == 0)
+		return -EIO;
+
+	/* STOP field */
+	c2port_strobe_ck(dev);
+
+	return 0;
+}
+
+static int c2port_read_dr(struct c2port_device *dev, u8 *data)
+{
+	struct c2port_ops *ops = dev->ops;
+	int timeout, i;
+
+	/* START field */
+	c2port_strobe_ck(dev);
+
+	/* INS field (00b, LSB first) */
+	ops->c2d_dir(dev, 0);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+
+	/* LENGTH field (00b, LSB first -> 1 byte) */
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+	ops->c2d_set(dev, 0);
+	c2port_strobe_ck(dev);
+
+	/* WAIT field */
+	ops->c2d_dir(dev, 1);
+	timeout = 20;
+	do {
+		c2port_strobe_ck(dev);
+		if (ops->c2d_get(dev))
+			break;
+
+		udelay(1);
+	} while (--timeout > 0);
+	if (timeout == 0)
+		return -EIO;
+
+	/* DATA field */
+	*data = 0;
+	for (i = 0; i < 8; i++) {
+		*data >>= 1;	/* shift in 8-bit DATA field LSB first */
+
+		c2port_strobe_ck(dev);
+		if (ops->c2d_get(dev))
+			*data |= 0x80;
+	}
+
+	/* STOP field */
+	c2port_strobe_ck(dev);
+
+	return 0;
+}
+
+static int c2port_poll_in_busy(struct c2port_device *dev)
+{
+	u8 addr;
+	int ret, timeout = 20;
+
+	do {
+		ret = (c2port_read_ar(dev, &addr));
+		if (ret < 0)
+			return -EIO;
+
+		if (!(addr & 0x02))
+			break;
+
+		udelay(1);
+	} while (--timeout > 0);
+	if (timeout == 0)
+		return -EIO;
+
+	return 0;
+}
+
+static int c2port_poll_out_ready(struct c2port_device *dev)
+{
+	u8 addr;
+	int ret, timeout = 10000; /* erase flash needs long time... */
+
+	do {
+		ret = (c2port_read_ar(dev, &addr));
+		if (ret < 0)
+			return -EIO;
+
+		if (addr & 0x01)
+			break;
+
+		udelay(1);
+	} while (--timeout > 0);
+	if (timeout == 0)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * sysfs methods
+ */
+
+static ssize_t c2port_show_name(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", c2dev->name);
+}
+
+static ssize_t c2port_show_flash_blocks_num(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	struct c2port_ops *ops = c2dev->ops;
+
+	return sprintf(buf, "%d\n", ops->blocks_num);
+}
+
+static ssize_t c2port_show_flash_block_size(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	struct c2port_ops *ops = c2dev->ops;
+
+	return sprintf(buf, "%d\n", ops->block_size);
+}
+
+static ssize_t c2port_show_flash_size(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	struct c2port_ops *ops = c2dev->ops;
+
+	return sprintf(buf, "%d\n", ops->blocks_num * ops->block_size);
+}
+
+static ssize_t c2port_show_access(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", c2dev->access);
+}
+
+static ssize_t c2port_store_access(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	struct c2port_ops *ops = c2dev->ops;
+	int status, ret;
+
+	ret = sscanf(buf, "%d", &status);
+	if (ret != 1)
+		return -EINVAL;
+
+	mutex_lock(&c2dev->mutex);
+
+	c2dev->access = !!status;
+
+	/* If access is "on" clock should be HIGH _before_ setting the line
+	 * as output and data line should be set as INPUT anyway */
+	if (c2dev->access)
+		ops->c2ck_set(c2dev, 1);
+	ops->access(c2dev, c2dev->access);
+	if (c2dev->access)
+		ops->c2d_dir(c2dev, 1);
+
+	mutex_unlock(&c2dev->mutex);
+
+	return count;
+}
+
+static ssize_t c2port_store_reset(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+
+	/* Check the device access status */
+	if (!c2dev->access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+
+	c2port_reset(c2dev);
+	c2dev->flash_access = 0;
+
+	mutex_unlock(&c2dev->mutex);
+
+	return count;
+}
+
+static ssize_t __c2port_show_dev_id(struct c2port_device *dev, char *buf)
+{
+	u8 data;
+	int ret;
+
+	/* Select DEVICEID register for C2 data register accesses */
+	c2port_write_ar(dev, C2PORT_DEVICEID);
+
+	/* Read and return the device ID register */
+	ret = c2port_read_dr(dev, &data);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", data);
+}
+
+static ssize_t c2port_show_dev_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	ssize_t ret;
+
+	/* Check the device access status */
+	if (!c2dev->access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_show_dev_id(c2dev, buf);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0)
+		dev_err(dev, "cannot read from %s\n", c2dev->name);
+
+	return ret;
+}
+
+static ssize_t __c2port_show_rev_id(struct c2port_device *dev, char *buf)
+{
+	u8 data;
+	int ret;
+
+	/* Select REVID register for C2 data register accesses */
+	c2port_write_ar(dev, C2PORT_REVID);
+
+	/* Read and return the revision ID register */
+	ret = c2port_read_dr(dev, &data);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%d\n", data);
+}
+
+static ssize_t c2port_show_rev_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	ssize_t ret;
+
+	/* Check the device access status */
+	if (!c2dev->access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_show_rev_id(c2dev, buf);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0)
+		dev_err(c2dev->dev, "cannot read from %s\n", c2dev->name);
+
+	return ret;
+}
+
+static ssize_t c2port_show_flash_access(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", c2dev->flash_access);
+}
+
+static ssize_t __c2port_store_flash_access(struct c2port_device *dev,
+						int status)
+{
+	int ret;
+
+	/* Check the device access status */
+	if (!dev->access)
+		return -EBUSY;
+
+	dev->flash_access = !!status;
+
+	/* If flash_access is off we have nothing to do... */
+	if (dev->flash_access == 0)
+		return 0;
+
+	/* Target the C2 flash programming control register for C2 data
+	 * register access */
+	c2port_write_ar(dev, C2PORT_FPCTL);
+
+	/* Write the first keycode to enable C2 Flash programming */
+	ret = c2port_write_dr(dev, 0x02);
+	if (ret < 0)
+		return ret;
+
+	/* Write the second keycode to enable C2 Flash programming */
+	ret = c2port_write_dr(dev, 0x01);
+	if (ret < 0)
+		return ret;
+
+	/* Delay for at least 20ms to ensure the target is ready for
+	 * C2 flash programming */
+	mdelay(25);
+
+	return 0;
+}
+
+static ssize_t c2port_store_flash_access(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	int status;
+	ssize_t ret;
+
+	ret = sscanf(buf, "%d", &status);
+	if (ret != 1)
+		return -EINVAL;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_store_flash_access(c2dev, status);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0) {
+		dev_err(c2dev->dev, "cannot enable %s flash programming\n",
+			c2dev->name);
+		return ret;
+	}
+
+	return count;
+}
+
+static ssize_t __c2port_write_flash_erase(struct c2port_device *dev)
+{
+	u8 status;
+	int ret;
+
+	/* Target the C2 flash programming data register for C2 data register
+	 * access.
+	 */
+	c2port_write_ar(dev, C2PORT_FPDAT);
+
+	/* Send device erase command */
+	c2port_write_dr(dev, C2PORT_DEVICE_ERASE);
+
+	/* Wait for input acknowledge */
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Should check status before starting FLASH access sequence */
+
+	/* Wait for status information */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Read flash programming interface status */
+	ret = c2port_read_dr(dev, &status);
+	if (ret < 0)
+		return ret;
+	if (status != C2PORT_COMMAND_OK)
+		return -EBUSY;
+
+	/* Send a three-byte arming sequence to enable the device erase.
+	 * If the sequence is not received correctly, the command will be
+	 * ignored.
+	 * Sequence is: 0xde, 0xad, 0xa5.
+	 */
+	c2port_write_dr(dev, 0xde);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+	c2port_write_dr(dev, 0xad);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+	c2port_write_dr(dev, 0xa5);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static ssize_t c2port_store_flash_erase(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct c2port_device *c2dev = dev_get_drvdata(dev);
+	int ret;
+
+	/* Check the device and flash access status */
+	if (!c2dev->access || !c2dev->flash_access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_write_flash_erase(c2dev);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0) {
+		dev_err(c2dev->dev, "cannot erase %s flash\n", c2dev->name);
+		return ret;
+	}
+
+	return count;
+}
+
+static ssize_t __c2port_read_flash_data(struct c2port_device *dev,
+				char *buffer, loff_t offset, size_t count)
+{
+	struct c2port_ops *ops = dev->ops;
+	u8 status, nread = 128;
+	int i, ret;
+
+	/* Check for flash end */
+	if (offset >= ops->block_size * ops->blocks_num)
+		return 0;
+
+	if (ops->block_size * ops->blocks_num - offset < nread)
+		nread = ops->block_size * ops->blocks_num - offset;
+	if (count < nread)
+		nread = count;
+	if (nread == 0)
+		return nread;
+
+	/* Target the C2 flash programming data register for C2 data register
+	 * access */
+	c2port_write_ar(dev, C2PORT_FPDAT);
+
+	/* Send flash block read command */
+	c2port_write_dr(dev, C2PORT_BLOCK_READ);
+
+	/* Wait for input acknowledge */
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Should check status before starting FLASH access sequence */
+
+	/* Wait for status information */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Read flash programming interface status */
+	ret = c2port_read_dr(dev, &status);
+	if (ret < 0)
+		return ret;
+	if (status != C2PORT_COMMAND_OK)
+		return -EBUSY;
+
+	/* Send address high byte */
+	c2port_write_dr(dev, offset >> 8);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Send address low byte */
+	c2port_write_dr(dev, offset & 0x00ff);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Send address block size */
+	c2port_write_dr(dev, nread);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Should check status before reading FLASH block */
+
+	/* Wait for status information */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Read flash programming interface status */
+	ret = c2port_read_dr(dev, &status);
+	if (ret < 0)
+		return ret;
+	if (status != C2PORT_COMMAND_OK)
+		return -EBUSY;
+
+	/* Read flash block */
+	for (i = 0; i < nread; i++) {
+		ret = c2port_poll_out_ready(dev);
+		if (ret < 0)
+			return ret;
+
+		ret = c2port_read_dr(dev, buffer+i);
+		if (ret < 0)
+			return ret;
+	}
+
+	return nread;
+}
+
+static ssize_t c2port_read_flash_data(struct kobject *kobj,
+				struct bin_attribute *attr,
+				char *buffer, loff_t offset, size_t count)
+{
+	struct c2port_device *c2dev =
+			dev_get_drvdata(container_of(kobj,
+						struct device, kobj));
+	ssize_t ret;
+
+	/* Check the device and flash access status */
+	if (!c2dev->access || !c2dev->flash_access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_read_flash_data(c2dev, buffer, offset, count);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0)
+		dev_err(c2dev->dev, "cannot read %s flash\n", c2dev->name);
+
+	return ret;
+}
+
+static ssize_t __c2port_write_flash_data(struct c2port_device *dev,
+				char *buffer, loff_t offset, size_t count)
+{
+	struct c2port_ops *ops = dev->ops;
+	u8 status, nwrite = 128;
+	int i, ret;
+
+	if (nwrite > count)
+		nwrite = count;
+	if (ops->block_size * ops->blocks_num - offset < nwrite)
+		nwrite = ops->block_size * ops->blocks_num - offset;
+
+	/* Check for flash end */
+	if (offset >= ops->block_size * ops->blocks_num)
+		return -EINVAL;
+
+	/* Target the C2 flash programming data register for C2 data register
+	 * access */
+	c2port_write_ar(dev, C2PORT_FPDAT);
+
+	/* Send flash block write command */
+	c2port_write_dr(dev, C2PORT_BLOCK_WRITE);
+
+	/* Wait for input acknowledge */
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Should check status before starting FLASH access sequence */
+
+	/* Wait for status information */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Read flash programming interface status */
+	ret = c2port_read_dr(dev, &status);
+	if (ret < 0)
+		return ret;
+	if (status != C2PORT_COMMAND_OK)
+		return -EBUSY;
+
+	/* Send address high byte */
+	c2port_write_dr(dev, offset >> 8);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Send address low byte */
+	c2port_write_dr(dev, offset & 0x00ff);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Send address block size */
+	c2port_write_dr(dev, nwrite);
+	ret = c2port_poll_in_busy(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Should check status before writing FLASH block */
+
+	/* Wait for status information */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Read flash programming interface status */
+	ret = c2port_read_dr(dev, &status);
+	if (ret < 0)
+		return ret;
+	if (status != C2PORT_COMMAND_OK)
+		return -EBUSY;
+
+	/* Write flash block */
+	for (i = 0; i < nwrite; i++) {
+		ret = c2port_write_dr(dev, *(buffer+i));
+		if (ret < 0)
+			return ret;
+
+		ret = c2port_poll_in_busy(dev);
+		if (ret < 0)
+			return ret;
+
+	}
+
+	/* Wait for last flash write to complete */
+	ret = c2port_poll_out_ready(dev);
+	if (ret < 0)
+		return ret;
+
+	return nwrite;
+}
+
+static ssize_t c2port_write_flash_data(struct kobject *kobj,
+				struct bin_attribute *attr,
+				char *buffer, loff_t offset, size_t count)
+{
+	struct c2port_device *c2dev =
+			dev_get_drvdata(container_of(kobj,
+						struct device, kobj));
+	int ret;
+
+	/* Check the device access status */
+	if (!c2dev->access || !c2dev->flash_access)
+		return -EBUSY;
+
+	mutex_lock(&c2dev->mutex);
+	ret = __c2port_write_flash_data(c2dev, buffer, offset, count);
+	mutex_unlock(&c2dev->mutex);
+
+	if (ret < 0)
+		dev_err(c2dev->dev, "cannot write %s flash\n", c2dev->name);
+
+	return ret;
+}
+
+/*
+ * Class attributes
+ */
+
+static struct device_attribute c2port_attrs[] = {
+	__ATTR(name, 0444, c2port_show_name, NULL),
+	__ATTR(flash_blocks_num, 0444, c2port_show_flash_blocks_num, NULL),
+	__ATTR(flash_block_size, 0444, c2port_show_flash_block_size, NULL),
+	__ATTR(flash_size, 0444, c2port_show_flash_size, NULL),
+	__ATTR(access, 0644, c2port_show_access, c2port_store_access),
+	__ATTR(reset, 0200, NULL, c2port_store_reset),
+	__ATTR(dev_id, 0444, c2port_show_dev_id, NULL),
+	__ATTR(rev_id, 0444, c2port_show_rev_id, NULL),
+
+	__ATTR(flash_access, 0644, c2port_show_flash_access,
+					c2port_store_flash_access),
+	__ATTR(flash_erase, 0200, NULL, c2port_store_flash_erase),
+	__ATTR_NULL,
+};
+
+static struct bin_attribute c2port_bin_attrs = {
+	.attr	= {
+		.name	= "flash_data",
+		.mode	= 0644
+	},
+	.read	= c2port_read_flash_data,
+	.write	= c2port_write_flash_data,
+	/* .size is computed at run-time */
+};
+
+/*
+ * Exported functions
+ */
+
+struct c2port_device *c2port_device_register(char *name,
+					struct c2port_ops *ops, void *devdata)
+{
+	struct c2port_device *c2dev;
+	int id, ret;
+
+	if (unlikely(!ops) || unlikely(!ops->access) || \
+		unlikely(!ops->c2d_dir) || unlikely(!ops->c2ck_set) || \
+		unlikely(!ops->c2d_get) || unlikely(!ops->c2d_set))
+		return ERR_PTR(-EINVAL);
+
+	c2dev = kmalloc(sizeof(struct c2port_device), GFP_KERNEL);
+	if (unlikely(!c2dev))
+		return ERR_PTR(-ENOMEM);
+
+	ret = idr_pre_get(&c2port_idr, GFP_KERNEL);
+	if (!ret) {
+		ret = -ENOMEM;
+		goto error_idr_get_new;
+	}
+
+	spin_lock_irq(&c2port_idr_lock);
+	ret = idr_get_new(&c2port_idr, c2dev, &id);
+	spin_unlock_irq(&c2port_idr_lock);
+
+	if (ret < 0)
+		goto error_idr_get_new;
+	c2dev->id = id;
+
+	c2dev->dev = device_create(c2port_class, NULL, 0, c2dev,
+					"c2port%d", id);
+	if (unlikely(!c2dev->dev)) {
+		ret = -ENOMEM;
+		goto error_device_create;
+	}
+	dev_set_drvdata(c2dev->dev, c2dev);
+
+	strncpy(c2dev->name, name, C2PORT_NAME_LEN);
+	c2dev->ops = ops;
+	mutex_init(&c2dev->mutex);
+
+	/* Create binary file */
+	c2port_bin_attrs.size = ops->blocks_num * ops->block_size;
+	ret = device_create_bin_file(c2dev->dev, &c2port_bin_attrs);
+	if (unlikely(ret))
+		goto error_device_create_bin_file;
+
+	/* By default C2 port access is off */
+	c2dev->access = c2dev->flash_access = 0;
+	ops->access(c2dev, 0);
+
+	dev_info(c2dev->dev, "C2 port %s added\n", name);
+	dev_info(c2dev->dev, "%s flash has %d blocks x %d bytes "
+				"(%d bytes total)\n",
+				name, ops->blocks_num, ops->block_size,
+				ops->blocks_num * ops->block_size);
+
+	return c2dev;
+
+error_device_create_bin_file:
+	device_destroy(c2port_class, 0);
+
+error_device_create:
+	spin_lock_irq(&c2port_idr_lock);
+	idr_remove(&c2port_idr, id);
+	spin_unlock_irq(&c2port_idr_lock);
+
+error_idr_get_new:
+	kfree(c2dev);
+
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(c2port_device_register);
+
+void c2port_device_unregister(struct c2port_device *c2dev)
+{
+	if (!c2dev)
+		return;
+
+	dev_info(c2dev->dev, "C2 port %s removed\n", c2dev->name);
+
+	device_remove_bin_file(c2dev->dev, &c2port_bin_attrs);
+	spin_lock_irq(&c2port_idr_lock);
+	idr_remove(&c2port_idr, c2dev->id);
+	spin_unlock_irq(&c2port_idr_lock);
+
+	device_destroy(c2port_class, c2dev->id);
+
+	kfree(c2dev);
+}
+EXPORT_SYMBOL(c2port_device_unregister);
+
+/*
+ * Module stuff
+ */
+
+static int __init c2port_init(void)
+{
+	printk(KERN_INFO "Silicon Labs C2 port support v. " DRIVER_VERSION
+		" - (C) 2007 Rodolfo Giometti\n");
+
+	c2port_class = class_create(THIS_MODULE, "c2port");
+	if (!c2port_class) {
+		printk(KERN_ERR "c2port: failed to allocate class\n");
+		return -ENOMEM;
+	}
+	c2port_class->dev_attrs = c2port_attrs;
+
+	return 0;
+}
+
+static void __exit c2port_exit(void)
+{
+	class_destroy(c2port_class);
+}
+
+module_init(c2port_init);
+module_exit(c2port_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("Silicon Labs C2 port support v. " DRIVER_VERSION);
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/compal-laptop.c b/drivers/misc/compal-laptop.c
index 344b790a625..11003bba10d 100644
--- a/drivers/misc/compal-laptop.c
+++ b/drivers/misc/compal-laptop.c
@@ -326,12 +326,14 @@ static int __init compal_init(void)
 
 	/* Register backlight stuff */
 
-	compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
-						&compalbl_ops);
-	if (IS_ERR(compalbl_device))
-		return PTR_ERR(compalbl_device);
+	if (!acpi_video_backlight_support()) {
+		compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
+							    &compalbl_ops);
+		if (IS_ERR(compalbl_device))
+			return PTR_ERR(compalbl_device);
 
-	compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
+		compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
+	}
 
 	ret = platform_driver_register(&compal_driver);
 	if (ret)
diff --git a/drivers/misc/eeepc-laptop.c b/drivers/misc/eeepc-laptop.c
index 9ef98b2d503..02fe2b8b893 100644
--- a/drivers/misc/eeepc-laptop.c
+++ b/drivers/misc/eeepc-laptop.c
@@ -825,9 +825,15 @@ static int __init eeepc_laptop_init(void)
 		return -ENODEV;
 	}
 	dev = acpi_get_physical_device(ehotk->device->handle);
-	result = eeepc_backlight_init(dev);
-	if (result)
-		goto fail_backlight;
+
+	if (!acpi_video_backlight_support()) {
+		result = eeepc_backlight_init(dev);
+		if (result)
+			goto fail_backlight;
+	} else
+		printk(EEEPC_INFO "Backlight controlled by ACPI video "
+		       "driver\n");
+
 	result = eeepc_hwmon_init(dev);
 	if (result)
 		goto fail_hwmon;
diff --git a/drivers/misc/fujitsu-laptop.c b/drivers/misc/fujitsu-laptop.c
index d2cf0bfe316..a7dd3e9fb79 100644
--- a/drivers/misc/fujitsu-laptop.c
+++ b/drivers/misc/fujitsu-laptop.c
@@ -464,6 +464,14 @@ static int dmi_check_cb_s6410(const struct dmi_system_id *id)
 	return 0;
 }
 
+static int dmi_check_cb_s6420(const struct dmi_system_id *id)
+{
+	dmi_check_cb_common(id);
+	fujitsu->keycode1 = KEY_SCREENLOCK;	/* "Lock" */
+	fujitsu->keycode2 = KEY_HELP;	/* "Mobility Center" */
+	return 0;
+}
+
 static int dmi_check_cb_p8010(const struct dmi_system_id *id)
 {
 	dmi_check_cb_common(id);
@@ -473,7 +481,7 @@ static int dmi_check_cb_p8010(const struct dmi_system_id *id)
 	return 0;
 }
 
-static struct dmi_system_id __initdata fujitsu_dmi_table[] = {
+static struct dmi_system_id fujitsu_dmi_table[] = {
 	{
 	 .ident = "Fujitsu Siemens S6410",
 	 .matches = {
@@ -482,6 +490,13 @@ static struct dmi_system_id __initdata fujitsu_dmi_table[] = {
 		     },
 	 .callback = dmi_check_cb_s6410},
 	{
+	 .ident = "Fujitsu Siemens S6420",
+	 .matches = {
+		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK S6420"),
+		     },
+	 .callback = dmi_check_cb_s6420},
+	{
 	 .ident = "Fujitsu LifeBook P8010",
 	 .matches = {
 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
@@ -990,16 +1005,16 @@ static int __init fujitsu_init(void)
 
 	/* Register backlight stuff */
 
-	fujitsu->bl_device =
-	    backlight_device_register("fujitsu-laptop", NULL, NULL,
-				      &fujitsubl_ops);
-	if (IS_ERR(fujitsu->bl_device))
-		return PTR_ERR(fujitsu->bl_device);
-
-	max_brightness = fujitsu->max_brightness;
-
-	fujitsu->bl_device->props.max_brightness = max_brightness - 1;
-	fujitsu->bl_device->props.brightness = fujitsu->brightness_level;
+	if (!acpi_video_backlight_support()) {
+		fujitsu->bl_device =
+			backlight_device_register("fujitsu-laptop", NULL, NULL,
+						  &fujitsubl_ops);
+		if (IS_ERR(fujitsu->bl_device))
+			return PTR_ERR(fujitsu->bl_device);
+		max_brightness = fujitsu->max_brightness;
+		fujitsu->bl_device->props.max_brightness = max_brightness - 1;
+		fujitsu->bl_device->props.brightness = fujitsu->brightness_level;
+	}
 
 	ret = platform_driver_register(&fujitsupf_driver);
 	if (ret)
@@ -1035,7 +1050,8 @@ fail_hotkey:
 
 fail_backlight:
 
-	backlight_device_unregister(fujitsu->bl_device);
+	if (fujitsu->bl_device)
+		backlight_device_unregister(fujitsu->bl_device);
 
 fail_platform_device2:
 
@@ -1062,7 +1078,8 @@ static void __exit fujitsu_cleanup(void)
 			   &fujitsupf_attribute_group);
 	platform_device_unregister(fujitsu->pf_device);
 	platform_driver_unregister(&fujitsupf_driver);
-	backlight_device_unregister(fujitsu->bl_device);
+	if (fujitsu->bl_device)
+		backlight_device_unregister(fujitsu->bl_device);
 
 	acpi_bus_unregister_driver(&acpi_fujitsu_driver);
 
diff --git a/drivers/misc/ics932s401.c b/drivers/misc/ics932s401.c
new file mode 100644
index 00000000000..6e43ab4231a
--- /dev/null
+++ b/drivers/misc/ics932s401.c
@@ -0,0 +1,515 @@
+/*
+ * A driver for the Integrated Circuits ICS932S401
+ * Copyright (C) 2008 IBM
+ *
+ * Author: Darrick J. Wong <djwong@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(ics932s401);
+
+/* ICS932S401 registers */
+#define ICS932S401_REG_CFG2			0x01
+#define 	ICS932S401_CFG1_SPREAD		0x01
+#define ICS932S401_REG_CFG7			0x06
+#define		ICS932S401_FS_MASK		0x07
+#define	ICS932S401_REG_VENDOR_REV		0x07
+#define		ICS932S401_VENDOR		1
+#define		ICS932S401_VENDOR_MASK		0x0F
+#define		ICS932S401_REV			4
+#define		ICS932S401_REV_SHIFT		4
+#define ICS932S401_REG_DEVICE			0x09
+#define		ICS932S401_DEVICE		11
+#define	ICS932S401_REG_CTRL			0x0A
+#define		ICS932S401_MN_ENABLED		0x80
+#define		ICS932S401_CPU_ALT		0x04
+#define		ICS932S401_SRC_ALT		0x08
+#define ICS932S401_REG_CPU_M_CTRL		0x0B
+#define		ICS932S401_M_MASK		0x3F
+#define	ICS932S401_REG_CPU_N_CTRL		0x0C
+#define	ICS932S401_REG_CPU_SPREAD1		0x0D
+#define ICS932S401_REG_CPU_SPREAD2		0x0E
+#define		ICS932S401_SPREAD_MASK		0x7FFF
+#define ICS932S401_REG_SRC_M_CTRL		0x0F
+#define ICS932S401_REG_SRC_N_CTRL		0x10
+#define	ICS932S401_REG_SRC_SPREAD1		0x11
+#define ICS932S401_REG_SRC_SPREAD2		0x12
+#define ICS932S401_REG_CPU_DIVISOR		0x13
+#define 	ICS932S401_CPU_DIVISOR_SHIFT	4
+#define ICS932S401_REG_PCISRC_DIVISOR		0x14
+#define		ICS932S401_SRC_DIVISOR_MASK	0x0F
+#define		ICS932S401_PCI_DIVISOR_SHIFT	4
+
+/* Base clock is 14.318MHz */
+#define BASE_CLOCK				14318
+
+#define NUM_REGS				21
+#define NUM_MIRRORED_REGS			15
+
+static int regs_to_copy[NUM_MIRRORED_REGS] = {
+	ICS932S401_REG_CFG2,
+	ICS932S401_REG_CFG7,
+	ICS932S401_REG_VENDOR_REV,
+	ICS932S401_REG_DEVICE,
+	ICS932S401_REG_CTRL,
+	ICS932S401_REG_CPU_M_CTRL,
+	ICS932S401_REG_CPU_N_CTRL,
+	ICS932S401_REG_CPU_SPREAD1,
+	ICS932S401_REG_CPU_SPREAD2,
+	ICS932S401_REG_SRC_M_CTRL,
+	ICS932S401_REG_SRC_N_CTRL,
+	ICS932S401_REG_SRC_SPREAD1,
+	ICS932S401_REG_SRC_SPREAD2,
+	ICS932S401_REG_CPU_DIVISOR,
+	ICS932S401_REG_PCISRC_DIVISOR,
+};
+
+/* How often do we reread sensors values? (In jiffies) */
+#define SENSOR_REFRESH_INTERVAL	(2 * HZ)
+
+/* How often do we reread sensor limit values? (In jiffies) */
+#define LIMIT_REFRESH_INTERVAL	(60 * HZ)
+
+struct ics932s401_data {
+	struct attribute_group	attrs;
+	struct mutex		lock;
+	char			sensors_valid;
+	unsigned long		sensors_last_updated;	/* In jiffies */
+
+	u8			regs[NUM_REGS];
+};
+
+static int ics932s401_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id);
+static int ics932s401_detect(struct i2c_client *client, int kind,
+			  struct i2c_board_info *info);
+static int ics932s401_remove(struct i2c_client *client);
+
+static const struct i2c_device_id ics932s401_id[] = {
+	{ "ics932s401", ics932s401 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ics932s401_id);
+
+static struct i2c_driver ics932s401_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "ics932s401",
+	},
+	.probe		= ics932s401_probe,
+	.remove		= ics932s401_remove,
+	.id_table	= ics932s401_id,
+	.detect		= ics932s401_detect,
+	.address_data	= &addr_data,
+};
+
+static struct ics932s401_data *ics932s401_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ics932s401_data *data = i2c_get_clientdata(client);
+	unsigned long local_jiffies = jiffies;
+	int i, temp;
+
+	mutex_lock(&data->lock);
+	if (time_before(local_jiffies, data->sensors_last_updated +
+		SENSOR_REFRESH_INTERVAL)
+		&& data->sensors_valid)
+		goto out;
+
+	/*
+	 * Each register must be read as a word and then right shifted 8 bits.
+	 * Not really sure why this is; setting the "byte count programming"
+	 * register to 1 does not fix this problem.
+	 */
+	for (i = 0; i < NUM_MIRRORED_REGS; i++) {
+		temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
+		data->regs[regs_to_copy[i]] = temp >> 8;
+	}
+
+	data->sensors_last_updated = local_jiffies;
+	data->sensors_valid = 1;
+
+out:
+	mutex_unlock(&data->lock);
+	return data;
+}
+
+static ssize_t show_spread_enabled(struct device *dev,
+				   struct device_attribute *devattr,
+				   char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+
+	if (data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD)
+		return sprintf(buf, "1\n");
+
+	return sprintf(buf, "0\n");
+}
+
+/* bit to cpu khz map */
+static const int fs_speeds[] = {
+	266666,
+	133333,
+	200000,
+	166666,
+	333333,
+	100000,
+	400000,
+	0,
+};
+
+/* clock divisor map */
+static const int divisors[] = {2, 3, 5, 15, 4, 6, 10, 30, 8, 12, 20, 60, 16,
+			       24, 40, 120};
+
+/* Calculate CPU frequency from the M/N registers. */
+static int calculate_cpu_freq(struct ics932s401_data *data)
+{
+	int m, n, freq;
+
+	m = data->regs[ICS932S401_REG_CPU_M_CTRL] & ICS932S401_M_MASK;
+	n = data->regs[ICS932S401_REG_CPU_N_CTRL];
+
+	/* Pull in bits 8 & 9 from the M register */
+	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x80) << 1;
+	n |= ((int)data->regs[ICS932S401_REG_CPU_M_CTRL] & 0x40) << 3;
+
+	freq = BASE_CLOCK * (n + 8) / (m + 2);
+	freq /= divisors[data->regs[ICS932S401_REG_CPU_DIVISOR] >>
+			 ICS932S401_CPU_DIVISOR_SHIFT];
+
+	return freq;
+}
+
+static ssize_t show_cpu_clock(struct device *dev,
+			      struct device_attribute *devattr,
+			      char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+
+	return sprintf(buf, "%d\n", calculate_cpu_freq(data));
+}
+
+static ssize_t show_cpu_clock_sel(struct device *dev,
+				  struct device_attribute *devattr,
+				  char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+	int freq;
+
+	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
+		freq = calculate_cpu_freq(data);
+	else {
+		/* Freq is neatly wrapped up for us */
+		int fid = data->regs[ICS932S401_REG_CFG7] & ICS932S401_FS_MASK;
+		freq = fs_speeds[fid];
+		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT) {
+			switch (freq) {
+			case 166666:
+				freq = 160000;
+				break;
+			case 333333:
+				freq = 320000;
+				break;
+			}
+		}
+	}
+
+	return sprintf(buf, "%d\n", freq);
+}
+
+/* Calculate SRC frequency from the M/N registers. */
+static int calculate_src_freq(struct ics932s401_data *data)
+{
+	int m, n, freq;
+
+	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
+	n = data->regs[ICS932S401_REG_SRC_N_CTRL];
+
+	/* Pull in bits 8 & 9 from the M register */
+	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
+	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;
+
+	freq = BASE_CLOCK * (n + 8) / (m + 2);
+	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] &
+			 ICS932S401_SRC_DIVISOR_MASK];
+
+	return freq;
+}
+
+static ssize_t show_src_clock(struct device *dev,
+			      struct device_attribute *devattr,
+			      char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+
+	return sprintf(buf, "%d\n", calculate_src_freq(data));
+}
+
+static ssize_t show_src_clock_sel(struct device *dev,
+				  struct device_attribute *devattr,
+				  char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+	int freq;
+
+	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
+		freq = calculate_src_freq(data);
+	else
+		/* Freq is neatly wrapped up for us */
+		if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_CPU_ALT &&
+		    data->regs[ICS932S401_REG_CTRL] & ICS932S401_SRC_ALT)
+			freq = 96000;
+		else
+			freq = 100000;
+
+	return sprintf(buf, "%d\n", freq);
+}
+
+/* Calculate PCI frequency from the SRC M/N registers. */
+static int calculate_pci_freq(struct ics932s401_data *data)
+{
+	int m, n, freq;
+
+	m = data->regs[ICS932S401_REG_SRC_M_CTRL] & ICS932S401_M_MASK;
+	n = data->regs[ICS932S401_REG_SRC_N_CTRL];
+
+	/* Pull in bits 8 & 9 from the M register */
+	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x80) << 1;
+	n |= ((int)data->regs[ICS932S401_REG_SRC_M_CTRL] & 0x40) << 3;
+
+	freq = BASE_CLOCK * (n + 8) / (m + 2);
+	freq /= divisors[data->regs[ICS932S401_REG_PCISRC_DIVISOR] >>
+			 ICS932S401_PCI_DIVISOR_SHIFT];
+
+	return freq;
+}
+
+static ssize_t show_pci_clock(struct device *dev,
+			      struct device_attribute *devattr,
+			      char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+
+	return sprintf(buf, "%d\n", calculate_pci_freq(data));
+}
+
+static ssize_t show_pci_clock_sel(struct device *dev,
+				  struct device_attribute *devattr,
+				  char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+	int freq;
+
+	if (data->regs[ICS932S401_REG_CTRL] & ICS932S401_MN_ENABLED)
+		freq = calculate_pci_freq(data);
+	else
+		freq = 33333;
+
+	return sprintf(buf, "%d\n", freq);
+}
+
+static ssize_t show_value(struct device *dev,
+			  struct device_attribute *devattr,
+			  char *buf);
+
+static ssize_t show_spread(struct device *dev,
+			   struct device_attribute *devattr,
+			   char *buf);
+
+static DEVICE_ATTR(spread_enabled, S_IRUGO, show_spread_enabled, NULL);
+static DEVICE_ATTR(cpu_clock_selection, S_IRUGO, show_cpu_clock_sel, NULL);
+static DEVICE_ATTR(cpu_clock, S_IRUGO, show_cpu_clock, NULL);
+static DEVICE_ATTR(src_clock_selection, S_IRUGO, show_src_clock_sel, NULL);
+static DEVICE_ATTR(src_clock, S_IRUGO, show_src_clock, NULL);
+static DEVICE_ATTR(pci_clock_selection, S_IRUGO, show_pci_clock_sel, NULL);
+static DEVICE_ATTR(pci_clock, S_IRUGO, show_pci_clock, NULL);
+static DEVICE_ATTR(usb_clock, S_IRUGO, show_value, NULL);
+static DEVICE_ATTR(ref_clock, S_IRUGO, show_value, NULL);
+static DEVICE_ATTR(cpu_spread, S_IRUGO, show_spread, NULL);
+static DEVICE_ATTR(src_spread, S_IRUGO, show_spread, NULL);
+
+static struct attribute *ics932s401_attr[] =
+{
+	&dev_attr_spread_enabled.attr,
+	&dev_attr_cpu_clock_selection.attr,
+	&dev_attr_cpu_clock.attr,
+	&dev_attr_src_clock_selection.attr,
+	&dev_attr_src_clock.attr,
+	&dev_attr_pci_clock_selection.attr,
+	&dev_attr_pci_clock.attr,
+	&dev_attr_usb_clock.attr,
+	&dev_attr_ref_clock.attr,
+	&dev_attr_cpu_spread.attr,
+	&dev_attr_src_spread.attr,
+	NULL
+};
+
+static ssize_t show_value(struct device *dev,
+			  struct device_attribute *devattr,
+			  char *buf)
+{
+	int x;
+
+	if (devattr == &dev_attr_usb_clock)
+		x = 48000;
+	else if (devattr == &dev_attr_ref_clock)
+		x = BASE_CLOCK;
+	else
+		BUG();
+
+	return sprintf(buf, "%d\n", x);
+}
+
+static ssize_t show_spread(struct device *dev,
+			   struct device_attribute *devattr,
+			   char *buf)
+{
+	struct ics932s401_data *data = ics932s401_update_device(dev);
+	int reg;
+	unsigned long val;
+
+	if (!(data->regs[ICS932S401_REG_CFG2] & ICS932S401_CFG1_SPREAD))
+		return sprintf(buf, "0%%\n");
+
+	if (devattr == &dev_attr_src_spread)
+		reg = ICS932S401_REG_SRC_SPREAD1;
+	else if (devattr == &dev_attr_cpu_spread)
+		reg = ICS932S401_REG_CPU_SPREAD1;
+	else
+		BUG();
+
+	val = data->regs[reg] | (data->regs[reg + 1] << 8);
+	val &= ICS932S401_SPREAD_MASK;
+
+	/* Scale 0..2^14 to -0.5. */
+	val = 500000 * val / 16384;
+	return sprintf(buf, "-0.%lu%%\n", val);
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int ics932s401_detect(struct i2c_client *client, int kind,
+			  struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	if (kind <= 0) {
+		int vendor, device, revision;
+
+		vendor = i2c_smbus_read_word_data(client,
+						  ICS932S401_REG_VENDOR_REV);
+		vendor >>= 8;
+		revision = vendor >> ICS932S401_REV_SHIFT;
+		vendor &= ICS932S401_VENDOR_MASK;
+		if (vendor != ICS932S401_VENDOR)
+			return -ENODEV;
+
+		device = i2c_smbus_read_word_data(client,
+						  ICS932S401_REG_DEVICE);
+		device >>= 8;
+		if (device != ICS932S401_DEVICE)
+			return -ENODEV;
+
+		if (revision != ICS932S401_REV)
+			dev_info(&adapter->dev, "Unknown revision %d\n",
+				 revision);
+	} else
+		dev_dbg(&adapter->dev, "detection forced\n");
+
+	strlcpy(info->type, "ics932s401", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static int ics932s401_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct ics932s401_data *data;
+	int err;
+
+	data = kzalloc(sizeof(struct ics932s401_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->lock);
+
+	dev_info(&client->dev, "%s chip found\n", client->name);
+
+	/* Register sysfs hooks */
+	data->attrs.attrs = ics932s401_attr;
+	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
+	if (err)
+		goto exit_free;
+
+	return 0;
+
+exit_free:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int ics932s401_remove(struct i2c_client *client)
+{
+	struct ics932s401_data *data = i2c_get_clientdata(client);
+
+	sysfs_remove_group(&client->dev.kobj, &data->attrs);
+	kfree(data);
+	return 0;
+}
+
+static int __init ics932s401_init(void)
+{
+	return i2c_add_driver(&ics932s401_driver);
+}
+
+static void __exit ics932s401_exit(void)
+{
+	i2c_del_driver(&ics932s401_driver);
+}
+
+MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
+MODULE_DESCRIPTION("ICS932S401 driver");
+MODULE_LICENSE("GPL");
+
+module_init(ics932s401_init);
+module_exit(ics932s401_exit);
+
+/* IBM IntelliStation Z30 */
+MODULE_ALIAS("dmi:bvnIBM:*:rn9228:*");
+MODULE_ALIAS("dmi:bvnIBM:*:rn9232:*");
+
+/* IBM x3650/x3550 */
+MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650*");
+MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550*");
diff --git a/drivers/misc/intel_menlow.c b/drivers/misc/intel_menlow.c
index e00a2756e97..27b7662955b 100644
--- a/drivers/misc/intel_menlow.c
+++ b/drivers/misc/intel_menlow.c
@@ -52,6 +52,11 @@ MODULE_LICENSE("GPL");
 #define MEMORY_ARG_CUR_BANDWIDTH 1
 #define MEMORY_ARG_MAX_BANDWIDTH 0
 
+/*
+ * GTHS returning 'n' would mean that [0,n-1] states are supported
+ * In that case max_cstate would be n-1
+ * GTHS returning '0' would mean that no bandwidth control states are supported
+ */
 static int memory_get_int_max_bandwidth(struct thermal_cooling_device *cdev,
 					unsigned long *max_state)
 {
@@ -71,6 +76,9 @@ static int memory_get_int_max_bandwidth(struct thermal_cooling_device *cdev,
 	if (ACPI_FAILURE(status))
 		return -EFAULT;
 
+	if (!value)
+		return -EINVAL;
+
 	*max_state = value - 1;
 	return 0;
 }
@@ -121,7 +129,7 @@ static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
 	if (memory_get_int_max_bandwidth(cdev, &max_state))
 		return -EFAULT;
 
-	if (max_state < 0 || state > max_state)
+	if (state > max_state)
 		return -EINVAL;
 
 	arg_list.count = 1;
diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c
index de898c6938f..759763d18e4 100644
--- a/drivers/misc/msi-laptop.c
+++ b/drivers/misc/msi-laptop.c
@@ -347,12 +347,16 @@ static int __init msi_init(void)
 
 	/* Register backlight stuff */
 
-	msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
-						&msibl_ops);
-	if (IS_ERR(msibl_device))
-		return PTR_ERR(msibl_device);
-
-	msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+	if (acpi_video_backlight_support()) {
+		printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
+		       "by ACPI video driver\n");
+	} else {
+		msibl_device = backlight_device_register("msi-laptop-bl", NULL,
+							 NULL, &msibl_ops);
+		if (IS_ERR(msibl_device))
+			return PTR_ERR(msibl_device);
+		msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+	}
 
 	ret = platform_driver_register(&msipf_driver);
 	if (ret)
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 06f07e19dc7..7bcb81002dc 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -1038,7 +1038,11 @@ static int sony_nc_add(struct acpi_device *device)
 		goto outinput;
 	}
 
-	if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT", &handle))) {
+	if (!acpi_video_backlight_support()) {
+		printk(KERN_INFO DRV_PFX "Sony: Brightness ignored, must be "
+		       "controlled by ACPI video driver\n");
+	} else if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT",
+						&handle))) {
 		sony_backlight_device = backlight_device_register("sony", NULL,
 								  NULL,
 								  &sony_backlight_ops);
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 4db1cf9078d..7a4a26b0edd 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -4932,16 +4932,25 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
 	 */
 	b = tpacpi_check_std_acpi_brightness_support();
 	if (b > 0) {
-		if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) {
-			printk(TPACPI_NOTICE
-			       "Lenovo BIOS switched to ACPI backlight "
-			       "control mode\n");
-		}
-		if (brightness_enable > 1) {
-			printk(TPACPI_NOTICE
-			       "standard ACPI backlight interface "
-			       "available, not loading native one...\n");
-			return 1;
+
+		if (acpi_video_backlight_support()) {
+			if (brightness_enable > 1) {
+				printk(TPACPI_NOTICE
+				       "Standard ACPI backlight interface "
+				       "available, not loading native one.\n");
+				return 1;
+			} else if (brightness_enable == 1) {
+				printk(TPACPI_NOTICE
+				       "Backlight control force enabled, even if standard "
+				       "ACPI backlight interface is available\n");
+			}
+		} else {
+			if (brightness_enable > 1) {
+				printk(TPACPI_NOTICE
+				       "Standard ACPI backlight interface not "
+				       "available, thinkpad_acpi native "
+				       "brightness control enabled\n");
+			}
 		}
 	}