openwrt-mirror/target/linux/omap24xx/patches-3.3/250-cbus.patch

--- /dev/null
+++ b/drivers/cbus/cbus.c
@@ -0,0 +1,335 @@
+/*
+ * drivers/cbus/cbus.c
+ *
+ * Support functions for CBUS serial protocol
+ *
+ * Copyright (C) 2004-2010 Nokia Corporation
+ * Contact: Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
+ *	      David Weinehall <david.weinehall@nokia.com>, and
+ *	      Mikko Ylinen <mikko.k.ylinen@nokia.com>
+ *
+ * Several updates and cleanups by Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/cbus.h>
+
+#include "cbus.h"
+
+#define CBUS_XFER_READ		1
+#define CBUS_XFER_WRITE		0
+
+struct cbus_host {
+	/* host lock */
+	spinlock_t	lock;
+
+	struct device	*dev;
+
+	int		clk_gpio;
+	int		dat_gpio;
+	int		sel_gpio;
+};
+
+/**
+ * cbus_send_bit - sends one bit over the bus
+ * @host: the host we're using
+ * @bit: one bit of information to send
+ * @input: whether to set data pin as input after sending
+ */
+static int cbus_send_bit(struct cbus_host *host, unsigned bit,
+		unsigned input)
+{
+	int ret = 0;
+
+	gpio_set_value(host->dat_gpio, bit ? 1 : 0);
+	gpio_set_value(host->clk_gpio, 1);
+
+	/* The data bit is read on the rising edge of CLK */
+	if (input)
+		ret = gpio_direction_input(host->dat_gpio);
+
+	gpio_set_value(host->clk_gpio, 0);
+
+	return ret;
+}
+
+/**
+ * cbus_send_data - sends @len amount of data over the bus
+ * @host: the host we're using
+ * @data: the data to send
+ * @len: size of the transfer
+ * @input: whether to set data pin as input after sending
+ */
+static int cbus_send_data(struct cbus_host *host, unsigned data, unsigned len,
+		unsigned input)
+{
+	int ret = 0;
+	int i;
+
+	for (i = len; i > 0; i--) {
+		ret = cbus_send_bit(host, data & (1 << (i - 1)),
+				input && (i == 1));
+		if (ret < 0)
+			goto out;
+	}
+
+out:
+	return ret;
+}
+
+/**
+ * cbus_receive_bit - receives one bit from the bus
+ * @host: the host we're using
+ */
+static int cbus_receive_bit(struct cbus_host *host)
+{
+	int ret;
+
+	gpio_set_value(host->clk_gpio, 1);
+	ret = gpio_get_value(host->dat_gpio);
+	if (ret < 0)
+		goto out;
+	gpio_set_value(host->clk_gpio, 0);
+
+out:
+	return ret;
+}
+
+/**
+ * cbus_receive_data - receives @len data from the bus
+ * @host: the host we're using
+ * @len: the length of data to receive
+ */
+static int cbus_receive_data(struct cbus_host *host, unsigned len)
+{
+	int ret = 0;
+	int i;
+
+	for (i = 16; i > 0; i--) {
+		int bit = cbus_receive_bit(host);
+
+		if (bit < 0)
+			goto out;
+
+		if (bit)
+			ret |= 1 << (i - 1);
+	}
+
+out:
+	return ret;
+}
+
+/**
+ * cbus_transfer - transfers data over the bus
+ * @host: the host we're using
+ * @rw: read/write flag
+ * @dev: device address
+ * @reg: register address
+ * @data: if @rw == 0 data to send otherwise 0
+ */
+static int cbus_transfer(struct cbus_host *host, unsigned rw, unsigned dev,
+		unsigned reg, unsigned data)
+{
+	unsigned long flags;
+	int input = 0;
+	int ret = 0;
+
+	/* We don't want interrupts disturbing our transfer */
+	spin_lock_irqsave(&host->lock, flags);
+
+	/* Reset state and start of transfer, SEL stays down during transfer */
+	gpio_set_value(host->sel_gpio, 0);
+
+	/* Set the DAT pin to output */
+	gpio_direction_output(host->dat_gpio, 1);
+
+	/* Send the device address */
+	ret = cbus_send_data(host, dev, 3, 0);
+	if (ret < 0) {
+		dev_dbg(host->dev, "failed sending device addr\n");
+		goto out;
+	}
+
+	/* Send the rw flag */
+	ret = cbus_send_bit(host, rw, 0);
+	if (ret < 0) {
+		dev_dbg(host->dev, "failed sending read/write flag\n");
+		goto out;
+	}
+
+	/* Send the register address */
+	if (rw)
+		input = true;
+
+	ret = cbus_send_data(host, reg, 5, input);
+	if (ret < 0) {
+		dev_dbg(host->dev, "failed sending register addr\n");
+		goto out;
+	}
+
+	if (!rw) {
+		ret = cbus_send_data(host, data, 16, 0);
+		if (ret < 0) {
+			dev_dbg(host->dev, "failed sending data\n");
+			goto out;
+		}
+	} else {
+		gpio_set_value(host->clk_gpio, 1);
+
+		ret = cbus_receive_data(host, 16);
+		if (ret < 0) {
+			dev_dbg(host->dev, "failed receiving data\n");
+			goto out;
+		}
+	}
+
+	/* Indicate end of transfer, SEL goes up until next transfer */
+	gpio_set_value(host->sel_gpio, 1);
+	gpio_set_value(host->clk_gpio, 1);
+	gpio_set_value(host->clk_gpio, 0);
+
+out:
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	return ret;
+}
+
+/**
+ * cbus_read_reg - reads a given register from the device
+ * @child: the child device
+ * @dev: device address
+ * @reg: register address
+ */
+int cbus_read_reg(struct device *child, unsigned dev, unsigned reg)
+{
+	struct cbus_host	*host = dev_get_drvdata(child->parent);
+
+	return cbus_transfer(host, CBUS_XFER_READ, dev, reg, 0);
+}
+EXPORT_SYMBOL(cbus_read_reg);
+
+/**
+ * cbus_write_reg - writes to a given register of the device
+ * @child: the child device
+ * @dev: device address
+ * @reg: register address
+ * @val: data to be written to @reg
+ */
+int cbus_write_reg(struct device *child, unsigned dev, unsigned reg,
+		unsigned val)
+{
+	struct cbus_host	*host = dev_get_drvdata(child->parent);
+
+	return cbus_transfer(host, CBUS_XFER_WRITE, dev, reg, val);
+}
+EXPORT_SYMBOL(cbus_write_reg);
+
+static int __init cbus_bus_probe(struct platform_device *pdev)
+{
+	struct cbus_host *chost;
+	struct cbus_host_platform_data *pdata = pdev->dev.platform_data;
+	int ret;
+
+	chost = kzalloc(sizeof(*chost), GFP_KERNEL);
+	if (chost == NULL)
+		return -ENOMEM;
+
+	spin_lock_init(&chost->lock);
+
+	chost->clk_gpio = pdata->clk_gpio;
+	chost->dat_gpio = pdata->dat_gpio;
+	chost->sel_gpio = pdata->sel_gpio;
+	chost->dev = &pdev->dev;
+
+	ret = gpio_request(chost->clk_gpio, "CBUS clk");
+	if (ret < 0)
+		goto exit1;
+
+	ret = gpio_request(chost->dat_gpio, "CBUS data");
+	if (ret < 0)
+		goto exit2;
+
+	ret = gpio_request(chost->sel_gpio, "CBUS sel");
+	if (ret < 0)
+		goto exit3;
+
+	gpio_direction_output(chost->clk_gpio, 0);
+	gpio_direction_input(chost->dat_gpio);
+	gpio_direction_output(chost->sel_gpio, 1);
+
+	gpio_set_value(chost->clk_gpio, 1);
+	gpio_set_value(chost->clk_gpio, 0);
+
+	platform_set_drvdata(pdev, chost);
+
+	return 0;
+exit3:
+	gpio_free(chost->dat_gpio);
+exit2:
+	gpio_free(chost->clk_gpio);
+exit1:
+	kfree(chost);
+
+	return ret;
+}
+
+static void __exit cbus_bus_remove(struct platform_device *pdev)
+{
+	struct cbus_host	*chost = platform_get_drvdata(pdev);
+
+	gpio_free(chost->sel_gpio);
+	gpio_free(chost->dat_gpio);
+	gpio_free(chost->clk_gpio);
+
+	kfree(chost);
+}
+
+static struct platform_driver cbus_driver = {
+	.remove		= __exit_p(cbus_bus_remove),
+	.driver		= {
+		.name	= "cbus",
+	},
+};
+
+static int __init cbus_bus_init(void)
+{
+	return platform_driver_probe(&cbus_driver, cbus_bus_probe);
+}
+subsys_initcall(cbus_bus_init);
+
+static void __exit cbus_bus_exit(void)
+{
+	platform_driver_unregister(&cbus_driver);
+}
+module_exit(cbus_bus_exit);
+
+MODULE_DESCRIPTION("CBUS serial protocol");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä");
+MODULE_AUTHOR("David Weinehall");
+MODULE_AUTHOR("Mikko Ylinen");
+MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
+
--- /dev/null
+++ b/drivers/cbus/cbus.h
@@ -0,0 +1,30 @@
+/*
+ * drivers/cbus/cbus.h
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
+ *	      David Weinehall <david.weinehall@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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
+ */
+
+#ifndef __DRIVERS_CBUS_CBUS_H
+#define __DRIVERS_CBUS_CBUS_H
+
+extern int cbus_read_reg(struct device *, unsigned dev, unsigned reg);
+extern int cbus_write_reg(struct device *, unsigned dev, unsigned reg,
+		unsigned val);
+
+#endif /* __DRIVERS_CBUS_CBUS_H */
--- /dev/null
+++ b/drivers/cbus/Kconfig
@@ -0,0 +1,86 @@
+#
+# CBUS device configuration
+#
+
+menu "CBUS support"
+
+config CBUS
+	bool "CBUS support on OMAP"
+	---help---
+	  CBUS is a proprietary serial protocol by Nokia.  It is mainly
+	  used for accessing Energy Management auxiliary chips.
+
+	  If you want CBUS support, you should say Y here.
+
+config CBUS_TAHVO
+	depends on CBUS
+	bool "Support for Tahvo"
+	---help---
+	  Tahvo is a mixed signal ASIC with some system features
+
+	  If you want Tahvo support, you should say Y here.
+
+if CBUS_TAHVO
+
+config CBUS_TAHVO_USB
+	depends on USB
+	depends on ARCH_OMAP
+	select USB_OTG_UTILS
+	tristate "Support for Tahvo USB transceiver"
+	---help---
+	  If you want Tahvo support for USB transceiver, say Y or M here.
+
+config CBUS_TAHVO_USB_HOST_BY_DEFAULT
+	depends on CBUS_TAHVO_USB && USB_OTG
+	boolean "Device in USB host mode by default"
+	---help---
+	  Say Y here, if you want the device to enter USB host mode
+	  by default on bootup.
+
+endif # CBUS_TAHVO
+
+config CBUS_RETU
+	depends on CBUS
+	bool "Support for Retu"
+	---help---
+	  Retu is a mixed signal ASIC with some system features
+
+	  If you want Retu support, you should say Y here.
+
+if CBUS_RETU
+
+config CBUS_RETU_POWERBUTTON
+	depends on INPUT
+	bool "Support for Retu power button"
+	---help---
+	  The power button on Nokia 770 is connected to the Retu ASIC.
+
+	  If you want support for the Retu power button, you should say Y here.
+
+config CBUS_RETU_RTC
+	depends on RTC_CLASS
+	depends on ARCH_OMAP
+	tristate "Support for Retu pseudo-RTC"
+	---help---
+	  Say Y here if you want support for the device that alleges to be an
+	  RTC in Retu. This will expose a sysfs interface for it.
+
+config CBUS_RETU_WDT
+	depends on SYSFS && WATCHDOG
+	depends on ARCH_OMAP
+	tristate "Support for Retu watchdog timer"
+	---help---
+	  Say Y here if you want support for the watchdog in Retu. This will
+	  expose a sysfs interface to grok it.
+
+config CBUS_RETU_HEADSET
+	depends on SYSFS
+	tristate "Support for headset detection with Retu/Vilma"
+	---help---
+	  Say Y here if you want support detecting a headset that's connected
+	  to Retu/Vilma. Detection state and events are exposed through
+	  sysfs.
+
+endif # CBUS_RETU
+
+endmenu
--- /dev/null
+++ b/drivers/cbus/Makefile
@@ -0,0 +1,13 @@
+#
+# Makefile for CBUS.
+#
+
+obj-$(CONFIG_CBUS)		+= cbus.o
+obj-$(CONFIG_CBUS_TAHVO)	+= tahvo.o
+obj-$(CONFIG_CBUS_RETU)		+= retu.o
+obj-$(CONFIG_CBUS_TAHVO_USB)	+= tahvo-usb.o
+
+obj-$(CONFIG_CBUS_RETU_POWERBUTTON) += retu-pwrbutton.o
+obj-$(CONFIG_CBUS_RETU_RTC)	+= retu-rtc.o
+obj-$(CONFIG_CBUS_RETU_WDT)	+= retu-wdt.o
+obj-$(CONFIG_CBUS_RETU_HEADSET)	+= retu-headset.o
--- /dev/null
+++ b/drivers/cbus/retu.c
@@ -0,0 +1,549 @@
+/**
+ * drivers/cbus/retu.c
+ *
+ * Support functions for Retu ASIC
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
+ *	      David Weinehall <david.weinehall@nokia.com>, and
+ *	      Mikko Ylinen <mikko.k.ylinen@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/cbus.h>
+
+#include <asm/bitops.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+struct retu {
+	/* Device lock */
+	struct mutex		mutex;
+	struct device		*dev;
+
+	int			devid;
+
+	int			irq_base;
+	int			irq_end;
+
+	int			irq;
+
+	int			ack;
+	bool			ack_pending;
+
+	int			mask;
+	bool			mask_pending;
+
+	bool			is_vilma;
+};
+
+static struct retu *the_retu;
+
+/**
+ * __retu_read_reg - Read a value from a register in Retu
+ * @retu: pointer to retu structure
+ * @reg: the register address to read from
+ */
+static int __retu_read_reg(struct retu *retu, unsigned reg)
+{
+	return cbus_read_reg(retu->dev, retu->devid, reg);
+}
+
+/**
+ * __retu_write_reg - Writes a value to a register in Retu
+ * @retu: pointer to retu structure
+ * @reg: the register address to write to
+ * @val: the value to write to the register
+ */
+static void __retu_write_reg(struct retu *retu, unsigned reg, u16 val)
+{
+	cbus_write_reg(retu->dev, retu->devid, reg, val);
+}
+
+/**
+ * retu_read_reg - Read a value from a register in Retu
+ * @child: device pointer for the calling child
+ * @reg: the register to read from
+ *
+ * This function returns the contents of the specified register
+ */
+int retu_read_reg(struct device *child, unsigned reg)
+{
+	struct retu		*retu = dev_get_drvdata(child->parent);
+
+	return __retu_read_reg(retu, reg);
+}
+EXPORT_SYMBOL_GPL(retu_read_reg);
+
+/**
+ * retu_write_reg - Write a value to a register in Retu
+ * @child: the pointer to our calling child
+ * @reg: the register to write to
+ * @val: the value to write to the register
+ *
+ * This function writes a value to the specified register
+ */
+void retu_write_reg(struct device *child, unsigned reg, u16 val)
+{
+	struct retu		*retu = dev_get_drvdata(child->parent);
+
+	mutex_lock(&retu->mutex);
+	__retu_write_reg(retu, reg, val);
+	mutex_unlock(&retu->mutex);
+}
+EXPORT_SYMBOL_GPL(retu_write_reg);
+
+/**
+ * retu_set_clear_reg_bits - helper function to read/set/clear bits
+ * @child: device pointer to calling child
+ * @reg: the register address
+ * @set: mask for setting bits
+ * @clear: mask for clearing bits
+ */
+void retu_set_clear_reg_bits(struct device *child, unsigned reg, u16 set,
+		u16 clear)
+{
+	struct retu		*retu = dev_get_drvdata(child->parent);
+	u16			w;
+
+	mutex_lock(&retu->mutex);
+	w = __retu_read_reg(retu, reg);
+	w &= ~clear;
+	w |= set;
+	__retu_write_reg(retu, reg, w);
+	mutex_unlock(&retu->mutex);
+}
+EXPORT_SYMBOL_GPL(retu_set_clear_reg_bits);
+
+#define ADC_MAX_CHAN_NUMBER	13
+
+/**
+ * retu_read_adc - Reads AD conversion result
+ * @child: device pointer to calling child
+ * @channel: the ADC channel to read from
+ */
+int retu_read_adc(struct device *child, int channel)
+{
+	struct retu		*retu = dev_get_drvdata(child->parent);
+	int			res;
+
+	if (!retu)
+		return -ENODEV;
+
+	if (channel < 0 || channel > ADC_MAX_CHAN_NUMBER)
+		return -EINVAL;
+
+	mutex_lock(&retu->mutex);
+
+	if ((channel == 8) && retu->is_vilma) {
+		int scr = __retu_read_reg(retu, RETU_REG_ADCSCR);
+		int ch = (__retu_read_reg(retu, RETU_REG_ADCR) >> 10) & 0xf;
+		if (((scr & 0xff) != 0) && (ch != 8))
+			__retu_write_reg(retu, RETU_REG_ADCSCR, (scr & ~0xff));
+	}
+
+	/* Select the channel and read result */
+	__retu_write_reg(retu, RETU_REG_ADCR, channel << 10);
+	res = __retu_read_reg(retu, RETU_REG_ADCR) & 0x3ff;
+
+	if (retu->is_vilma)
+		__retu_write_reg(retu, RETU_REG_ADCR, (1 << 13));
+
+	/* Unlock retu */
+	mutex_unlock(&retu->mutex);
+
+	return res;
+}
+EXPORT_SYMBOL_GPL(retu_read_adc);
+
+static irqreturn_t retu_irq_handler(int irq, void *_retu)
+{
+	struct retu		*retu = _retu;
+
+	u16			idr;
+	u16			imr;
+
+	mutex_lock(&retu->mutex);
+	idr = __retu_read_reg(retu, RETU_REG_IDR);
+	imr = __retu_read_reg(retu, RETU_REG_IMR);
+	mutex_unlock(&retu->mutex);
+
+	idr &= ~imr;
+	if (!idr) {
+		dev_vdbg(retu->dev, "No IRQ, spurious?\n");
+		return IRQ_NONE;
+	}
+
+	while (idr) {
+		unsigned long	pending = __ffs(idr);
+		unsigned int	irq;
+
+		idr &= ~BIT(pending);
+		irq = pending + retu->irq_base;
+		handle_nested_irq(irq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* -------------------------------------------------------------------------- */
+
+static void retu_irq_mask(struct irq_data *data)
+{
+	struct retu		*retu = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	retu->mask |= (1 << (irq - retu->irq_base));
+	retu->mask_pending = true;
+}
+
+static void retu_irq_unmask(struct irq_data *data)
+{
+	struct retu		*retu = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	retu->mask &= ~(1 << (irq - retu->irq_base));
+	retu->mask_pending = true;
+
+}
+
+static void retu_irq_ack(struct irq_data *data)
+{
+	struct retu		*retu = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	retu->ack |= (1 << (irq - retu->irq_base));
+	retu->ack_pending = true;
+}
+
+static void retu_bus_lock(struct irq_data *data)
+{
+	struct retu		*retu = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&retu->mutex);
+}
+
+static void retu_bus_sync_unlock(struct irq_data *data)
+{
+	struct retu		*retu = irq_data_get_irq_chip_data(data);
+
+	if (retu->mask_pending) {
+		__retu_write_reg(retu, RETU_REG_IMR, retu->mask);
+		retu->mask_pending = false;
+	}
+
+	if (retu->ack_pending) {
+		__retu_write_reg(retu, RETU_REG_IDR, retu->ack);
+		retu->ack_pending = false;
+	}
+
+	mutex_unlock(&retu->mutex);
+}
+
+static struct irq_chip retu_irq_chip = {
+	.name			= "retu",
+	.irq_bus_lock		= retu_bus_lock,
+	.irq_bus_sync_unlock	= retu_bus_sync_unlock,
+	.irq_mask		= retu_irq_mask,
+	.irq_unmask		= retu_irq_unmask,
+	.irq_ack		= retu_irq_ack,
+};
+
+static inline void retu_irq_setup(int irq)
+{
+#ifdef CONFIG_ARM
+	set_irq_flags(irq, IRQF_VALID);
+#else
+	irq_set_noprobe(irq);
+#endif
+}
+
+static void retu_irq_init(struct retu *retu)
+{
+	int			base = retu->irq_base;
+	int			end = retu->irq_end;
+	int			irq;
+
+	for (irq = base; irq < end; irq++) {
+		irq_set_chip_data(irq, retu);
+		irq_set_chip_and_handler(irq, &retu_irq_chip,
+				handle_simple_irq);
+		irq_set_nested_thread(irq, 1);
+		retu_irq_setup(irq);
+	}
+}
+
+static void retu_irq_exit(struct retu *retu)
+{
+	int			base = retu->irq_base;
+	int			end = retu->irq_end;
+	int			irq;
+
+	for (irq = base; irq < end; irq++) {
+#ifdef CONFIG_ARM
+		set_irq_flags(irq, 0);
+#endif
+		irq_set_chip_and_handler(irq, NULL, NULL);
+		irq_set_chip_data(irq, NULL);
+	}
+}
+
+/* -------------------------------------------------------------------------- */
+
+/**
+ * retu_power_off - Shut down power to system
+ *
+ * This function puts the system in power off state
+ */
+static void retu_power_off(void)
+{
+	struct retu		*retu = the_retu;
+	unsigned		reg;
+
+	reg = __retu_read_reg(retu, RETU_REG_CC1);
+
+	/* Ignore power button state */
+	__retu_write_reg(retu, RETU_REG_CC1, reg | 2);
+	/* Expire watchdog immediately */
+	__retu_write_reg(retu, RETU_REG_WATCHDOG, 0);
+	/* Wait for poweroff*/
+	for (;;);
+}
+
+static struct resource generic_resources[] = {
+	{
+		.start	= -EINVAL,	/* fixed later */
+		.flags	= IORESOURCE_IRQ,
+	},
+	{
+		.start	= -EINVAL,	/* fixed later */
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+/**
+ * retu_allocate_child - Allocates one Retu child
+ * @name: name of new child
+ * @parent: parent device for this child
+ */
+static struct device *retu_allocate_child(char *name, struct device *parent,
+		int irq_base, int irq1, int irq2, int num)
+{
+	struct platform_device		*pdev;
+	int				status;
+
+	pdev = platform_device_alloc(name, -1);
+	if (!pdev) {
+		dev_dbg(parent, "can't allocate %s\n", name);
+		goto err;
+	}
+
+	pdev->dev.parent = parent;
+
+	if (num) {
+		generic_resources[0].start = irq_base + irq1;
+		generic_resources[1].start = irq_base + irq2;
+
+		status = platform_device_add_resources(pdev,
+				generic_resources, num);
+		if (status < 0) {
+			dev_dbg(parent, "can't add resources to %s\n", name);
+			goto err;
+		}
+	}
+
+	status = platform_device_add(pdev);
+	if (status < 0) {
+		dev_dbg(parent, "can't add %s\n", name);
+		goto err;
+	}
+
+	return &pdev->dev;
+
+err:
+	platform_device_put(pdev);
+
+	return NULL;
+}
+
+/**
+ * retu_allocate_children - Allocates Retu's children
+ */
+static int retu_allocate_children(struct device *parent, int irq_base)
+{
+	struct device	*child;
+
+	child = retu_allocate_child("retu-pwrbutton", parent, irq_base,
+			RETU_INT_PWR, -1, 1);
+	if (!child)
+		return -ENOMEM;
+
+	child = retu_allocate_child("retu-headset", parent, irq_base,
+			RETU_INT_HOOK, -1, 1);
+	if (!child)
+		return -ENOMEM;
+
+	child = retu_allocate_child("retu-rtc", parent, irq_base,
+			RETU_INT_RTCS, RETU_INT_RTCA, 2);
+	if (!child)
+		return -ENOMEM;
+
+	child = retu_allocate_child("retu-wdt", parent, -1, -1, -1, 0);
+	if (!child)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ * retu_probe - Probe for Retu ASIC
+ * @dev: the Retu device
+ *
+ * Probe for the Retu ASIC and allocate memory
+ * for its device-struct if found
+ */
+static int __devinit retu_probe(struct platform_device *pdev)
+{
+	struct retu	*retu;
+	struct cbus_retu_platform_data *pdata = pdev->dev.platform_data;
+
+	int		ret = -ENOMEM;
+	int		rev;
+
+	retu = kzalloc(sizeof(*retu), GFP_KERNEL);
+	if (!retu) {
+		dev_err(&pdev->dev, "not enough memory\n");
+		goto err0;
+	}
+
+	platform_set_drvdata(pdev, retu);
+
+	ret = irq_alloc_descs(-1, 0, MAX_RETU_IRQ_HANDLERS, 0);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to allocate IRQ descs\n");
+		goto err1;
+	}
+
+	retu->irq	= platform_get_irq(pdev, 0);
+	retu->irq_base	= ret;
+	retu->irq_end	= ret + MAX_RETU_IRQ_HANDLERS;
+	retu->devid	= pdata->devid;
+	retu->dev	= &pdev->dev;
+	the_retu	= retu;
+
+	mutex_init(&retu->mutex);
+
+	retu_irq_init(retu);
+
+	rev = __retu_read_reg(retu, RETU_REG_ASICR) & 0xff;
+	if (rev & (1 << 7))
+		retu->is_vilma = true;
+
+	dev_info(&pdev->dev, "%s v%d.%d found\n",
+			retu->is_vilma ? "Vilma" : "Retu",
+			(rev >> 4) & 0x07, rev & 0x0f);
+
+	/* Mask all RETU interrupts */
+	__retu_write_reg(retu, RETU_REG_IMR, 0xffff);
+
+	ret = request_threaded_irq(retu->irq, NULL, retu_irq_handler,
+			IRQF_ONESHOT, "retu", retu);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Unable to register IRQ handler\n");
+		goto err2;
+	}
+
+	irq_set_irq_wake(retu->irq, 1);
+
+	/* Register power off function */
+	pm_power_off = retu_power_off;
+
+	ret = retu_allocate_children(&pdev->dev, retu->irq_base);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Unable to allocate Retu children\n");
+		goto err3;
+	}
+
+	return 0;
+
+err3:
+	pm_power_off = NULL;
+	free_irq(retu->irq, retu);
+
+err2:
+	retu_irq_exit(retu);
+	irq_free_descs(retu->irq_base, MAX_RETU_IRQ_HANDLERS);
+
+err1:
+	kfree(retu);
+	the_retu = NULL;
+
+err0:
+	return ret;
+}
+
+static int __devexit retu_remove(struct platform_device *pdev)
+{
+	struct retu		*retu = platform_get_drvdata(pdev);
+
+	pm_power_off = NULL;
+	the_retu = NULL;
+
+	free_irq(retu->irq, retu);
+	retu_irq_exit(retu);
+	irq_free_descs(retu->irq_base, MAX_RETU_IRQ_HANDLERS);
+	kfree(retu);
+
+	return 0;
+}
+
+static struct platform_driver retu_driver = {
+	.probe		= retu_probe,
+	.remove		= __devexit_p(retu_remove),
+	.driver		= {
+		.name	= "retu",
+	},
+};
+
+static int __init retu_init(void)
+{
+	return platform_driver_register(&retu_driver);
+}
+subsys_initcall(retu_init);
+
+static void __exit retu_exit(void)
+{
+	platform_driver_unregister(&retu_driver);
+}
+module_exit(retu_exit);
+
+MODULE_DESCRIPTION("Retu ASIC control");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä");
+MODULE_AUTHOR("David Weinehall");
+MODULE_AUTHOR("Mikko Ylinen");
--- /dev/null
+++ b/drivers/cbus/retu.h
@@ -0,0 +1,85 @@
+/**
+ * drivers/cbus/retu.h
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
+ *	      David Weinehall <david.weinehall@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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
+ */
+
+#ifndef __DRIVERS_CBUS_RETU_H
+#define __DRIVERS_CBUS_RETU_H
+
+#include <linux/types.h>
+
+/* Registers */
+#define RETU_REG_ASICR		0x00	/* ASIC ID & revision */
+#define RETU_REG_IDR		0x01	/* Interrupt ID */
+#define RETU_REG_IMR		0x02	/* Interrupt mask */
+#define RETU_REG_RTCDSR		0x03	/* RTC seconds register */
+#define RETU_REG_RTCHMR		0x04	/* RTC hours and minutes register */
+#define RETU_REG_RTCHMAR	0x05	/* RTC hours and minutes alarm and time set register */
+#define RETU_REG_RTCCALR	0x06	/* RTC calibration register */
+#define RETU_REG_ADCR		0x08	/* ADC result */
+#define RETU_REG_ADCSCR		0x09	/* ADC sample ctrl */
+#define RETU_REG_CC1		0x0d	/* Common control register 1 */
+#define RETU_REG_CC2		0x0e	/* Common control register 2 */
+#define RETU_REG_CTRL_CLR	0x0f	/* Regulator clear register */
+#define RETU_REG_CTRL_SET	0x10	/* Regulator set register */
+#define RETU_REG_STATUS		0x16	/* Status register */
+#define  RETU_REG_STATUS_BATAVAIL	0x0100 /* Battery available */
+#define  RETU_REG_STATUS_CHGPLUG	0x1000 /* Charger is plugged in */
+#define RETU_REG_WATCHDOG	0x17	/* Watchdog register */
+#define RETU_REG_AUDTXR		0x18	/* Audio Codec Tx register */
+#define RETU_REG_MAX		0x1f
+
+/* Interrupt sources */
+#define RETU_INT_PWR		0
+#define RETU_INT_CHAR		1
+#define RETU_INT_RTCS		2
+#define RETU_INT_RTCM		3
+#define RETU_INT_RTCD		4
+#define RETU_INT_RTCA		5
+#define RETU_INT_HOOK		6
+#define RETU_INT_HEAD		7
+#define RETU_INT_ADCS		8
+
+#define	MAX_RETU_IRQ_HANDLERS	16
+
+/* ADC channels */
+#define RETU_ADC_GND		0x00 /* Ground */
+#define RETU_ADC_BSI		0x01 /* Battery Size Indicator */
+#define RETU_ADC_BATTEMP	0x02 /* Battery temperature */
+#define RETU_ADC_CHGVOLT	0x03 /* Charger voltage */
+#define RETU_ADC_HEADSET	0x04 /* Headset detection */
+#define RETU_ADC_HOOKDET	0x05 /* Hook detection */
+#define RETU_ADC_RFGP		0x06 /* RF GP */
+#define RETU_ADC_WBTX		0x07 /* Wideband Tx detection */
+#define RETU_ADC_BATTVOLT	0x08 /* Battery voltage measurement */
+#define RETU_ADC_GND2		0x09 /* Ground */
+#define RETU_ADC_LIGHTSENS	0x0A /* Light sensor */
+#define RETU_ADC_LIGHTTEMP	0x0B /* Light sensor temperature */
+#define RETU_ADC_BKUPVOLT	0x0C /* Backup battery voltage */
+#define RETU_ADC_TEMP		0x0D /* RETU temperature */
+
+
+int retu_read_reg(struct device *child, unsigned reg);
+void retu_write_reg(struct device *child, unsigned reg, u16 val);
+void retu_set_clear_reg_bits(struct device *child, unsigned reg, u16 set,
+		u16 clear);
+int retu_read_adc(struct device *child, int channel);
+
+#endif /* __DRIVERS_CBUS_RETU_H */
--- /dev/null
+++ b/drivers/cbus/retu-headset.c
@@ -0,0 +1,359 @@
+/**
+ * Retu/Vilma headset detection
+ *
+ * Copyright (C) 2006 Nokia Corporation
+ *
+ * Written by Juha Yrjölä
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+
+#include "retu.h"
+
+#define RETU_ADC_CHANNEL_HOOKDET	0x05
+
+#define RETU_HEADSET_KEY		KEY_PHONE
+
+struct retu_headset {
+	spinlock_t			lock;
+	struct mutex			mutex;
+	struct device			*dev;
+	struct input_dev		*idev;
+	unsigned			bias_enabled;
+	unsigned			detection_enabled;
+	unsigned			pressed;
+	struct timer_list		enable_timer;
+	struct timer_list		detect_timer;
+	int				irq;
+};
+
+static void retu_headset_set_bias(struct retu_headset *hs, int enable)
+{
+	if (enable) {
+		retu_set_clear_reg_bits(hs->dev, RETU_REG_AUDTXR,
+					(1 << 0) | (1 << 1), 0);
+		msleep(2);
+		retu_set_clear_reg_bits(hs->dev, RETU_REG_AUDTXR,
+				1 << 3, 0);
+	} else {
+		retu_set_clear_reg_bits(hs->dev, RETU_REG_AUDTXR, 0,
+					(1 << 0) | (1 << 1) | (1 << 3));
+	}
+}
+
+static void retu_headset_enable(struct retu_headset *hs)
+{
+	mutex_lock(&hs->mutex);
+	if (!hs->bias_enabled) {
+		hs->bias_enabled = 1;
+		retu_headset_set_bias(hs, 1);
+	}
+	mutex_unlock(&hs->mutex);
+}
+
+static void retu_headset_disable(struct retu_headset *hs)
+{
+	mutex_lock(&hs->mutex);
+	if (hs->bias_enabled) {
+		hs->bias_enabled = 0;
+		retu_headset_set_bias(hs, 0);
+	}
+	mutex_unlock(&hs->mutex);
+}
+
+static void retu_headset_det_enable(struct retu_headset *hs)
+{
+	mutex_lock(&hs->mutex);
+	if (!hs->detection_enabled) {
+		hs->detection_enabled = 1;
+		retu_set_clear_reg_bits(hs->dev, RETU_REG_CC1,
+				(1 << 10) | (1 << 8), 0);
+	}
+	mutex_unlock(&hs->mutex);
+}
+
+static void retu_headset_det_disable(struct retu_headset *hs)
+{
+	unsigned long flags;
+
+	mutex_lock(&hs->mutex);
+	if (hs->detection_enabled) {
+		hs->detection_enabled = 0;
+		del_timer_sync(&hs->enable_timer);
+		del_timer_sync(&hs->detect_timer);
+		spin_lock_irqsave(&hs->lock, flags);
+		if (hs->pressed)
+			input_report_key(hs->idev, RETU_HEADSET_KEY, 0);
+		spin_unlock_irqrestore(&hs->lock, flags);
+		retu_set_clear_reg_bits(hs->dev, RETU_REG_CC1, 0,
+				(1 << 10) | (1 << 8));
+	}
+	mutex_unlock(&hs->mutex);
+}
+
+static ssize_t retu_headset_hookdet_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	int val;
+
+	val = retu_read_adc(dev, RETU_ADC_CHANNEL_HOOKDET);
+	return sprintf(buf, "%d\n", val);
+}
+
+static DEVICE_ATTR(hookdet, S_IRUGO, retu_headset_hookdet_show, NULL);
+
+static ssize_t retu_headset_enable_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct retu_headset *hs = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", hs->bias_enabled);
+}
+
+static ssize_t retu_headset_enable_store(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
+{
+	struct retu_headset *hs = dev_get_drvdata(dev);
+	int enable;
+
+	if (sscanf(buf, "%u", &enable) != 1)
+		return -EINVAL;
+	if (enable)
+		retu_headset_enable(hs);
+	else
+	        retu_headset_disable(hs);
+	return count;
+}
+
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR | S_IWGRP,
+		   retu_headset_enable_show, retu_headset_enable_store);
+
+static ssize_t retu_headset_enable_det_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf)
+{
+	struct retu_headset *hs = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", hs->detection_enabled);
+}
+
+static ssize_t retu_headset_enable_det_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	struct retu_headset *hs = dev_get_drvdata(dev);
+	int enable;
+
+	if (sscanf(buf, "%u", &enable) != 1)
+		return -EINVAL;
+	if (enable)
+		retu_headset_det_enable(hs);
+	else
+	        retu_headset_det_disable(hs);
+	return count;
+}
+
+static DEVICE_ATTR(enable_det, S_IRUGO | S_IWUSR | S_IWGRP,
+		   retu_headset_enable_det_show,
+		   retu_headset_enable_det_store);
+
+static irqreturn_t retu_headset_hook_interrupt(int irq, void *_hs)
+{
+	struct retu_headset	*hs = _hs;
+	unsigned long		flags;
+
+	spin_lock_irqsave(&hs->lock, flags);
+	if (!hs->pressed) {
+		/* Headset button was just pressed down. */
+		hs->pressed = 1;
+		input_report_key(hs->idev, RETU_HEADSET_KEY, 1);
+	}
+	spin_unlock_irqrestore(&hs->lock, flags);
+	retu_set_clear_reg_bits(hs->dev, RETU_REG_CC1, 0,
+			(1 << 10) | (1 << 8));
+	mod_timer(&hs->enable_timer, jiffies + msecs_to_jiffies(50));
+
+	return IRQ_HANDLED;
+}
+
+static void retu_headset_enable_timer(unsigned long arg)
+{
+	struct retu_headset *hs = (struct retu_headset *) arg;
+
+	retu_set_clear_reg_bits(hs->dev, RETU_REG_CC1,
+			(1 << 10) | (1 << 8), 0);
+	mod_timer(&hs->detect_timer, jiffies + msecs_to_jiffies(350));
+}
+
+static void retu_headset_detect_timer(unsigned long arg)
+{
+	struct retu_headset *hs = (struct retu_headset *) arg;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hs->lock, flags);
+	if (hs->pressed) {
+		hs->pressed = 0;
+		input_report_key(hs->idev, RETU_HEADSET_KEY, 0);
+	}
+	spin_unlock_irqrestore(&hs->lock, flags);
+}
+
+static int __init retu_headset_probe(struct platform_device *pdev)
+{
+	struct retu_headset *hs;
+	int irq;
+	int r;
+
+	hs = kzalloc(sizeof(*hs), GFP_KERNEL);
+	if (hs == NULL)
+		return -ENOMEM;
+
+	hs->dev = &pdev->dev;
+
+	hs->idev = input_allocate_device();
+	if (hs->idev == NULL) {
+		r = -ENOMEM;
+		goto err1;
+	}
+	hs->idev->name = "retu-headset";
+	hs->idev->dev.parent = &pdev->dev;
+	set_bit(EV_KEY, hs->idev->evbit);
+	set_bit(RETU_HEADSET_KEY, hs->idev->keybit);
+	r = input_register_device(hs->idev);
+	if (r < 0)
+		goto err2;
+
+	r = device_create_file(&pdev->dev, &dev_attr_hookdet);
+	if (r < 0)
+		goto err3;
+	r = device_create_file(&pdev->dev, &dev_attr_enable);
+	if (r < 0)
+		goto err4;
+	r = device_create_file(&pdev->dev, &dev_attr_enable_det);
+	if (r < 0)
+		goto err5;
+	platform_set_drvdata(pdev, hs);
+
+	spin_lock_init(&hs->lock);
+	mutex_init(&hs->mutex);
+	setup_timer(&hs->enable_timer, retu_headset_enable_timer,
+		    (unsigned long) hs);
+	setup_timer(&hs->detect_timer, retu_headset_detect_timer,
+		    (unsigned long) hs);
+
+	irq = platform_get_irq(pdev, 0);
+	hs->irq = irq;
+
+	r = request_threaded_irq(irq, NULL, retu_headset_hook_interrupt, 0,
+			"hookdet", hs);
+	if (r != 0) {
+		dev_err(&pdev->dev, "hookdet IRQ not available\n");
+		goto err6;
+	}
+
+	return 0;
+err6:
+	device_remove_file(&pdev->dev, &dev_attr_enable_det);
+err5:
+	device_remove_file(&pdev->dev, &dev_attr_enable);
+err4:
+	device_remove_file(&pdev->dev, &dev_attr_hookdet);
+err3:
+	input_unregister_device(hs->idev);
+err2:
+	input_free_device(hs->idev);
+err1:
+	kfree(hs);
+	return r;
+}
+
+static int retu_headset_remove(struct platform_device *pdev)
+{
+	struct retu_headset *hs = platform_get_drvdata(pdev);
+
+	device_remove_file(&pdev->dev, &dev_attr_hookdet);
+	device_remove_file(&pdev->dev, &dev_attr_enable);
+	device_remove_file(&pdev->dev, &dev_attr_enable_det);
+	retu_headset_disable(hs);
+	retu_headset_det_disable(hs);
+	free_irq(hs->irq, hs);
+	input_unregister_device(hs->idev);
+	input_free_device(hs->idev);
+
+	return 0;
+}
+
+static int retu_headset_suspend(struct platform_device *pdev,
+				pm_message_t mesg)
+{
+	struct retu_headset *hs = platform_get_drvdata(pdev);
+
+	mutex_lock(&hs->mutex);
+	if (hs->bias_enabled)
+		retu_headset_set_bias(hs, 0);
+	mutex_unlock(&hs->mutex);
+
+	return 0;
+}
+
+static int retu_headset_resume(struct platform_device *pdev)
+{
+	struct retu_headset *hs = platform_get_drvdata(pdev);
+
+	mutex_lock(&hs->mutex);
+	if (hs->bias_enabled)
+		retu_headset_set_bias(hs, 1);
+	mutex_unlock(&hs->mutex);
+
+	return 0;
+}
+
+static struct platform_driver retu_headset_driver = {
+	.remove		= retu_headset_remove,
+	.suspend	= retu_headset_suspend,
+	.resume		= retu_headset_resume,
+	.driver		= {
+		.name	= "retu-headset",
+	},
+};
+
+static int __init retu_headset_init(void)
+{
+	return platform_driver_probe(&retu_headset_driver, retu_headset_probe);
+}
+
+static void __exit retu_headset_exit(void)
+{
+	platform_driver_unregister(&retu_headset_driver);
+}
+
+module_init(retu_headset_init);
+module_exit(retu_headset_exit);
+
+MODULE_DESCRIPTION("Retu/Vilma headset detection");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä");
--- /dev/null
+++ b/drivers/cbus/retu-pwrbutton.c
@@ -0,0 +1,165 @@
+/**
+ * drivers/cbus/retu-pwrbutton.c
+ *
+ * Driver for sending retu power button event to input-layer
+ *
+ * Copyright (C) 2004-2010 Nokia Corporation
+ *
+ * Written by
+ *	Ari Saastamoinen <ari.saastamoinen@elektrobit.com>
+ *	Juha Yrjola <juha.yrjola@solidboot.com>
+ *
+ * Contact: Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/jiffies.h>
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "retu.h"
+
+#define RETU_STATUS_PWRONX	(1 << 5)
+
+#define PWRBTN_DELAY		20
+#define PWRBTN_UP		0
+#define PWRBTN_PRESSED		1
+
+struct retu_pwrbutton {
+	struct input_dev	*idev;
+	struct device		*dev;
+
+	int			state;
+	int			irq;
+};
+
+static irqreturn_t retubutton_irq(int irq, void *_pwr)
+{
+	struct retu_pwrbutton *pwr = _pwr;
+	int state;
+
+	if (retu_read_reg(pwr->dev, RETU_REG_STATUS) & RETU_STATUS_PWRONX)
+		state = PWRBTN_UP;
+	else
+		state = PWRBTN_PRESSED;
+
+	if (pwr->state != state) {
+		input_report_key(pwr->idev, KEY_POWER, state);
+		input_sync(pwr->idev);
+		pwr->state = state;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int __init retubutton_probe(struct platform_device *pdev)
+{
+	struct retu_pwrbutton		*pwr;
+	int				ret = 0;
+
+	pwr = kzalloc(sizeof(*pwr), GFP_KERNEL);
+	if (!pwr) {
+		dev_err(&pdev->dev, "not enough memory\n");
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	pwr->dev = &pdev->dev;
+	pwr->irq = platform_get_irq(pdev, 0);
+	platform_set_drvdata(pdev, pwr);
+
+	ret = request_threaded_irq(pwr->irq, NULL, retubutton_irq, 0,
+			"retu-pwrbutton", pwr);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Cannot allocate irq\n");
+		goto err1;
+	}
+
+	pwr->idev = input_allocate_device();
+	if (!pwr->idev) {
+		dev_err(&pdev->dev, "can't allocate input device\n");
+		ret = -ENOMEM;
+		goto err2;
+	}
+
+	pwr->idev->evbit[0] = BIT_MASK(EV_KEY);
+	pwr->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+	pwr->idev->name = "retu-pwrbutton";
+
+	ret = input_register_device(pwr->idev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		goto err3;
+	}
+
+	return 0;
+
+err3:
+	input_free_device(pwr->idev);
+
+err2:
+	free_irq(pwr->irq, pwr);
+
+err1:
+	kfree(pwr);
+
+err0:
+	return ret;
+}
+
+static int __exit retubutton_remove(struct platform_device *pdev)
+{
+	struct retu_pwrbutton		*pwr = platform_get_drvdata(pdev);
+
+	free_irq(pwr->irq, pwr);
+	input_unregister_device(pwr->idev);
+	input_free_device(pwr->idev);
+	kfree(pwr);
+
+	return 0;
+}
+
+static struct platform_driver retu_pwrbutton_driver = {
+	.remove		= __exit_p(retubutton_remove),
+	.driver		= {
+		.name	= "retu-pwrbutton",
+	},
+};
+
+static int __init retubutton_init(void)
+{
+	return platform_driver_probe(&retu_pwrbutton_driver, retubutton_probe);
+}
+module_init(retubutton_init);
+
+static void __exit retubutton_exit(void)
+{
+	platform_driver_unregister(&retu_pwrbutton_driver);
+}
+module_exit(retubutton_exit);
+
+MODULE_DESCRIPTION("Retu Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ari Saastamoinen");
+MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
+
--- /dev/null
+++ b/drivers/cbus/retu-rtc.c
@@ -0,0 +1,287 @@
+/**
+ * drivers/cbus/retu-rtc.c
+ *
+ * Support for Retu RTC
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Paul Mundt <paul.mundt@nokia.com> and
+ *            Igor Stoppa <igor.stoppa@nokia.com>
+ *
+ * The Retu RTC is essentially a partial read-only RTC that gives us Retu's
+ * idea of what time actually is. It's left as a userspace excercise to map
+ * this back to time in the real world and ensure that calibration settings
+ * are sane to compensate for any horrible drift (on account of not being able
+ * to set the clock to anything).
+ *
+ * Days are semi-writeable. Namely, Retu will only track 255 days for us
+ * consecutively, after which the counter is explicitly stuck at 255 until
+ * someone comes along and clears it with a write. In the event that no one
+ * comes along and clears it, we no longer have any idea what day it is.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/rtc.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+struct retu_rtc {
+	/* device lock */
+	struct mutex		mutex;
+	struct device		*dev;
+	struct rtc_device	*rtc;
+
+	u16			alarm_expired;
+	int			irq_rtcs;
+	int			irq_rtca;
+};
+
+static void retu_rtc_do_reset(struct retu_rtc *rtc)
+{
+	u16 ccr1;
+
+	ccr1 = retu_read_reg(rtc->dev, RETU_REG_CC1);
+	/* RTC in reset */
+	retu_write_reg(rtc->dev, RETU_REG_CC1, ccr1 | 0x0001);
+	/* RTC in normal operating mode */
+	retu_write_reg(rtc->dev, RETU_REG_CC1, ccr1 & ~0x0001);
+
+	/* Disable alarm and RTC WD */
+	retu_write_reg(rtc->dev, RETU_REG_RTCHMAR, 0x7f3f);
+	/* Set Calibration register to default value */
+	retu_write_reg(rtc->dev, RETU_REG_RTCCALR, 0x00c0);
+
+	rtc->alarm_expired = 0;
+}
+
+static irqreturn_t retu_rtc_interrupt(int irq, void *_rtc)
+{
+	struct retu_rtc		*rtc = _rtc;
+
+	mutex_lock(&rtc->mutex);
+	rtc->alarm_expired = 1;
+	retu_write_reg(rtc->dev, RETU_REG_RTCHMAR, (24 << 8) | 60);
+	mutex_unlock(&rtc->mutex);
+
+	return IRQ_HANDLED;
+}
+
+static int retu_rtc_init_irq(struct retu_rtc *rtc)
+{
+	int irq;
+	int ret;
+
+	irq = platform_get_irq(to_platform_device(rtc->dev), 0);
+	rtc->irq_rtcs = irq;
+
+	irq = platform_get_irq(to_platform_device(rtc->dev), 1);
+	rtc->irq_rtca = irq;
+
+	ret = request_threaded_irq(rtc->irq_rtcs, NULL, retu_rtc_interrupt,
+			0, "RTCS", rtc);
+	if (ret != 0)
+		return ret;
+
+	ret = request_threaded_irq(rtc->irq_rtca, NULL, retu_rtc_interrupt,
+			0, "RTCA", rtc);
+	if (ret != 0) {
+		free_irq(rtc->irq_rtcs, rtc);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int retu_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct retu_rtc		*rtc = dev_get_drvdata(dev);
+	u16			chmar;
+
+	mutex_lock(&rtc->mutex);
+
+	chmar = ((alm->time.tm_hour & 0x1f) << 8) | (alm->time.tm_min & 0x3f);
+	retu_write_reg(rtc->dev, RETU_REG_RTCHMAR, chmar);
+
+	mutex_unlock(&rtc->mutex);
+
+	return 0;
+}
+
+static int retu_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct retu_rtc		*rtc = dev_get_drvdata(dev);
+	u16			chmar;
+
+	mutex_lock(&rtc->mutex);
+
+	chmar = retu_read_reg(rtc->dev, RETU_REG_RTCHMAR);
+
+	alm->time.tm_hour	= (chmar >> 8) & 0x1f;
+	alm->time.tm_min	= chmar & 0x3f;
+	alm->enabled		= !!rtc->alarm_expired;
+
+	mutex_unlock(&rtc->mutex);
+
+	return 0;
+}
+
+static int retu_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct retu_rtc		*rtc = dev_get_drvdata(dev);
+	u16			dsr;
+	u16			hmr;
+
+	dsr = ((tm->tm_mday & 0xff) << 8) | (tm->tm_hour & 0xff);
+	hmr = ((tm->tm_min & 0xff) << 8) | (tm->tm_sec & 0xff);
+
+	mutex_lock(&rtc->mutex);
+
+	retu_write_reg(rtc->dev, RETU_REG_RTCDSR, dsr);
+	retu_write_reg(rtc->dev, RETU_REG_RTCHMR, hmr);
+
+	mutex_unlock(&rtc->mutex);
+
+	return 0;
+}
+
+static int retu_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct retu_rtc		*rtc = dev_get_drvdata(dev);
+	u16			dsr;
+	u16			hmr;
+
+	/*
+	 * DSR holds days and hours
+	 * HMR hols minutes and seconds
+	 *
+	 * both are 16 bit registers with 8-bit for each field.
+	 */
+
+	mutex_lock(&rtc->mutex);
+
+	dsr	= retu_read_reg(rtc->dev, RETU_REG_RTCDSR);
+	hmr	= retu_read_reg(rtc->dev, RETU_REG_RTCHMR);
+
+	tm->tm_sec	= hmr & 0xff;
+	tm->tm_min	= hmr >> 8;
+	tm->tm_hour	= dsr & 0xff;
+	tm->tm_mday	= dsr >> 8;
+
+	mutex_unlock(&rtc->mutex);
+
+	return 0;
+}
+
+static struct rtc_class_ops retu_rtc_ops = {
+	.read_time		= retu_rtc_read_time,
+	.set_time		= retu_rtc_set_time,
+	.read_alarm		= retu_rtc_read_alarm,
+	.set_alarm		= retu_rtc_set_alarm,
+};
+
+static int __init retu_rtc_probe(struct platform_device *pdev)
+{
+	struct retu_rtc		*rtc;
+	int			r;
+
+	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+	if (!rtc) {
+		dev_err(&pdev->dev, "not enough memory\n");
+		r = -ENOMEM;
+		goto err0;
+	}
+
+	rtc->dev = &pdev->dev;
+	platform_set_drvdata(pdev, rtc);
+	mutex_init(&rtc->mutex);
+
+	rtc->alarm_expired = retu_read_reg(rtc->dev, RETU_REG_IDR) &
+		(0x1 << RETU_INT_RTCA);
+
+	r = retu_rtc_init_irq(rtc);
+	if (r < 0) {
+		dev_err(&pdev->dev, "failed to request retu irq\n");
+		goto err1;
+	}
+
+	/* If the calibration register is zero, we've probably lost power */
+	if (!(retu_read_reg(rtc->dev, RETU_REG_RTCCALR) & 0x00ff))
+		retu_rtc_do_reset(rtc);
+
+	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, &
+			retu_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc->rtc)) {
+		dev_err(&pdev->dev, "can't register RTC device\n");
+		goto err2;
+	}
+
+	return 0;
+
+err2:
+	free_irq(rtc->irq_rtcs, rtc);
+	free_irq(rtc->irq_rtca, rtc);
+
+err1:
+	kfree(rtc);
+
+err0:
+	return r;
+}
+
+static int __devexit retu_rtc_remove(struct platform_device *pdev)
+{
+	struct retu_rtc		*rtc = platform_get_drvdata(pdev);
+
+	free_irq(rtc->irq_rtcs, rtc);
+	free_irq(rtc->irq_rtca, rtc);
+	rtc_device_unregister(rtc->rtc);
+	kfree(rtc);
+
+	return 0;
+}
+
+static struct platform_driver retu_rtc_driver = {
+	.remove		= __exit_p(retu_rtc_remove),
+	.driver		= {
+		.name	= "retu-rtc",
+	},
+};
+
+static int __init retu_rtc_init(void)
+{
+	return platform_driver_probe(&retu_rtc_driver, retu_rtc_probe);
+}
+module_init(retu_rtc_init);
+
+static void __exit retu_rtc_exit(void)
+{
+	platform_driver_unregister(&retu_rtc_driver);
+}
+module_exit(retu_rtc_exit);
+
+MODULE_DESCRIPTION("Retu RTC");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Paul Mundt");
+MODULE_AUTHOR("Igor Stoppa");
+MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
+
--- /dev/null
+++ b/drivers/cbus/retu-wdt.c
@@ -0,0 +1,272 @@
+/**
+ * drivers/cbus/retu-wdt.c
+ *
+ * Driver for Retu watchdog
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Amit Kucheria <amit.kucheria@nokia.com>
+ *
+ * Cleanups by Michael Buesch <mb@bu3sch.de> (C) 2011
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include <linux/completion.h>
+#include <linux/errno.h>
+#include <linux/moduleparam.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+
+#include <asm/uaccess.h>
+
+#include <plat/prcm.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+/* Watchdog timeout in seconds */
+#define RETU_WDT_MIN_TIMER 0
+#define RETU_WDT_DEFAULT_TIMER 32
+#define RETU_WDT_MAX_TIMER 63
+
+struct retu_wdt_dev {
+	struct device		*dev;
+	unsigned int		period_val;	/* Current period of watchdog */
+	unsigned long		users;
+	struct miscdevice	miscdev;
+	struct delayed_work	ping_work;
+	struct mutex		mutex;
+};
+
+
+static inline void _retu_modify_counter(struct retu_wdt_dev *wdev,
+					unsigned int new)
+{
+	retu_write_reg(wdev->dev, RETU_REG_WATCHDOG, (u16)new);
+}
+
+static int retu_modify_counter(struct retu_wdt_dev *wdev, unsigned int new)
+{
+	if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER)
+		return -EINVAL;
+
+	mutex_lock(&wdev->mutex);
+	wdev->period_val = new;
+	_retu_modify_counter(wdev, wdev->period_val);
+	mutex_unlock(&wdev->mutex);
+
+	return 0;
+}
+
+/*
+ * Since retu watchdog cannot be disabled in hardware, we must kick it
+ * with a timer until userspace watchdog software takes over. Do this
+ * unless /dev/watchdog is open or CONFIG_WATCHDOG_NOWAYOUT is set.
+ */
+static void retu_wdt_ping_enable(struct retu_wdt_dev *wdev)
+{
+	_retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
+	schedule_delayed_work(&wdev->ping_work,
+			      round_jiffies_relative(RETU_WDT_DEFAULT_TIMER * HZ));
+}
+
+static void retu_wdt_ping_disable(struct retu_wdt_dev *wdev)
+{
+	_retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
+	cancel_delayed_work_sync(&wdev->ping_work);
+}
+
+static void retu_wdt_ping_work(struct work_struct *work)
+{
+	struct retu_wdt_dev *wdev = container_of(to_delayed_work(work),
+					struct retu_wdt_dev, ping_work);
+	retu_wdt_ping_enable(wdev);
+}
+
+static int retu_wdt_open(struct inode *inode, struct file *file)
+{
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+
+	if (test_and_set_bit(0, &wdev->users))
+		return -EBUSY;
+
+	retu_wdt_ping_disable(wdev);
+
+	return nonseekable_open(inode, file);
+}
+
+static int retu_wdt_release(struct inode *inode, struct file *file)
+{
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	retu_wdt_ping_enable(wdev);
+#endif
+	clear_bit(0, &wdev->users);
+
+	return 0;
+}
+
+static ssize_t retu_wdt_write(struct file *file, const char __user *data,
+						size_t len, loff_t *ppos)
+{
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+
+	if (len)
+		retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
+
+	return len;
+}
+
+static long retu_wdt_ioctl(struct file *file, unsigned int cmd,
+			   unsigned long arg)
+{
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+	int new_margin;
+
+	static const struct watchdog_info ident = {
+		.identity = "Retu Watchdog",
+		.options = WDIOF_SETTIMEOUT,
+		.firmware_version = 0,
+	};
+
+	switch (cmd) {
+	default:
+		return -ENOTTY;
+	case WDIOC_GETSUPPORT:
+		return copy_to_user((struct watchdog_info __user *)arg, &ident,
+							sizeof(ident));
+	case WDIOC_GETSTATUS:
+		return put_user(0, (int __user *)arg);
+	case WDIOC_GETBOOTSTATUS:
+		if (cpu_is_omap16xx())
+			return put_user(omap_readw(ARM_SYSST),
+					(int __user *)arg);
+		if (cpu_is_omap24xx())
+			return put_user(omap_prcm_get_reset_sources(),
+					(int __user *)arg);
+	case WDIOC_KEEPALIVE:
+		retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
+		break;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, (int __user *)arg))
+			return -EFAULT;
+		retu_modify_counter(wdev, new_margin);
+		/* Fall through */
+	case WDIOC_GETTIMEOUT:
+		return put_user(wdev->period_val, (int __user *)arg);
+	}
+
+	return 0;
+}
+
+static const struct file_operations retu_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.write		= retu_wdt_write,
+	.unlocked_ioctl	= retu_wdt_ioctl,
+	.open		= retu_wdt_open,
+	.release	= retu_wdt_release,
+};
+
+static int __init retu_wdt_probe(struct platform_device *pdev)
+{
+	struct retu_wdt_dev *wdev;
+	int ret;
+
+	wdev = kzalloc(sizeof(struct retu_wdt_dev), GFP_KERNEL);
+	if (!wdev)
+		return -ENOMEM;
+
+	wdev->dev = &pdev->dev;
+	wdev->period_val = RETU_WDT_DEFAULT_TIMER;
+	mutex_init(&wdev->mutex);
+
+	platform_set_drvdata(pdev, wdev);
+
+	wdev->miscdev.parent = &pdev->dev;
+	wdev->miscdev.minor = WATCHDOG_MINOR;
+	wdev->miscdev.name = "watchdog";
+	wdev->miscdev.fops = &retu_wdt_fops;
+
+	ret = misc_register(&wdev->miscdev);
+	if (ret)
+		goto err_free_wdev;
+
+	INIT_DELAYED_WORK(&wdev->ping_work, retu_wdt_ping_work);
+
+	/* Kick the watchdog for kernel booting to finish.
+	 * If nowayout is not set, we start the ping work. */
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+	retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
+#else
+	retu_wdt_ping_enable(wdev);
+#endif
+
+	return 0;
+
+err_free_wdev:
+	kfree(wdev);
+
+	return ret;
+}
+
+static int __devexit retu_wdt_remove(struct platform_device *pdev)
+{
+	struct retu_wdt_dev *wdev;
+
+	wdev = platform_get_drvdata(pdev);
+	misc_deregister(&wdev->miscdev);
+	cancel_delayed_work_sync(&wdev->ping_work);
+	kfree(wdev);
+
+	return 0;
+}
+
+static struct platform_driver retu_wdt_driver = {
+	.remove		= __exit_p(retu_wdt_remove),
+	.driver		= {
+		.name	= "retu-wdt",
+	},
+};
+
+static int __init retu_wdt_init(void)
+{
+	return platform_driver_probe(&retu_wdt_driver, retu_wdt_probe);
+}
+
+static void __exit retu_wdt_exit(void)
+{
+	platform_driver_unregister(&retu_wdt_driver);
+}
+
+module_init(retu_wdt_init);
+module_exit(retu_wdt_exit);
+
+MODULE_DESCRIPTION("Retu WatchDog");
+MODULE_AUTHOR("Amit Kucheria");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/drivers/cbus/tahvo.c
@@ -0,0 +1,423 @@
+/**
+ * drivers/cbus/tahvo.c
+ *
+ * Support functions for Tahvo ASIC
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
+ *	      David Weinehall <david.weinehall@nokia.com>, and
+ *	      Mikko Ylinen <mikko.k.ylinen@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/init.h>
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/cbus.h>
+#include <linux/mutex.h>
+
+#include "cbus.h"
+#include "tahvo.h"
+
+struct tahvo {
+	/* device lock */
+	struct mutex	mutex;
+	struct device	*dev;
+
+	int		irq_base;
+	int		irq_end;
+	int		irq;
+
+	int		ack;
+	int		mask;
+
+	unsigned int	mask_pending:1;
+	unsigned int	ack_pending:1;
+	unsigned int	is_betty:1;
+};
+
+/**
+ * __tahvo_read_reg - Reads a value from a register in Tahvo
+ * @tahvo: pointer to tahvo structure
+ * @reg: the register address to read from
+ */
+static int __tahvo_read_reg(struct tahvo *tahvo, unsigned reg)
+{
+	return cbus_read_reg(tahvo->dev, CBUS_TAHVO_DEVICE_ID, reg);
+}
+
+/**
+ * __tahvo_write_reg - Writes a value to a register in Tahvo
+ * @tahvo: pointer to tahvo structure
+ * @reg: register address to write to
+ * @val: the value to be written to @reg
+ */
+static void __tahvo_write_reg(struct tahvo *tahvo, unsigned reg, u16 val)
+{
+	cbus_write_reg(tahvo->dev, CBUS_TAHVO_DEVICE_ID, reg, val);
+}
+
+/**
+ * tahvo_read_reg - Read a value from a register in Tahvo
+ * @child: device pointer from the calling child
+ * @reg: the register to read from
+ *
+ * This function returns the contents of the specified register
+ */
+int tahvo_read_reg(struct device *child, unsigned reg)
+{
+	struct tahvo		*tahvo = dev_get_drvdata(child->parent);
+
+	return __tahvo_read_reg(tahvo, reg);
+}
+EXPORT_SYMBOL(tahvo_read_reg);
+
+/**
+ * tahvo_write_reg - Write a value to a register in Tahvo
+ * @child: device pointer from the calling child
+ * @reg: the register to write to
+ * @val : the value to write to the register
+ *
+ * This function writes a value to the specified register
+ */
+void tahvo_write_reg(struct device *child, unsigned reg, u16 val)
+{
+	struct tahvo		*tahvo = dev_get_drvdata(child->parent);
+
+	__tahvo_write_reg(tahvo, reg, val);
+}
+EXPORT_SYMBOL(tahvo_write_reg);
+
+/**
+ * tahvo_set_clear_reg_bits - set and clear register bits atomically
+ * @child: device pointer from the calling child
+ * @reg: the register to write to
+ * @bits: the bits to set
+ *
+ * This function sets and clears the specified Tahvo register bits atomically
+ */
+void tahvo_set_clear_reg_bits(struct device *child, unsigned reg, u16 set,
+		u16 clear)
+{
+	struct tahvo		*tahvo = dev_get_drvdata(child->parent);
+	u16			w;
+
+	mutex_lock(&tahvo->mutex);
+	w = __tahvo_read_reg(tahvo, reg);
+	w &= ~clear;
+	w |= set;
+	__tahvo_write_reg(tahvo, reg, w);
+	mutex_unlock(&tahvo->mutex);
+}
+
+static irqreturn_t tahvo_irq_handler(int irq, void *_tahvo)
+{
+	struct tahvo		*tahvo = _tahvo;
+	u16			id;
+	u16			im;
+
+	id = __tahvo_read_reg(tahvo, TAHVO_REG_IDR);
+	im = __tahvo_read_reg(tahvo, TAHVO_REG_IMR);
+	id &= ~im;
+
+	if (!id) {
+		dev_vdbg(tahvo->dev, "No IRQ, spurious ?\n");
+		return IRQ_NONE;
+	}
+
+	while (id) {
+		unsigned long	pending = __ffs(id);
+		unsigned int	irq;
+
+		id &= ~BIT(pending);
+		irq = pending + tahvo->irq_base;
+		handle_nested_irq(irq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* -------------------------------------------------------------------------- */
+
+static void tahvo_irq_bus_lock(struct irq_data *data)
+{
+	struct tahvo		*tahvo = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&tahvo->mutex);
+}
+
+static void tahvo_irq_bus_sync_unlock(struct irq_data *data)
+{
+	struct tahvo		*tahvo = irq_data_get_irq_chip_data(data);
+
+	if (tahvo->mask_pending) {
+		__tahvo_write_reg(tahvo, TAHVO_REG_IMR, tahvo->mask);
+		tahvo->mask_pending = false;
+	}
+
+	if (tahvo->ack_pending) {
+		__tahvo_write_reg(tahvo, TAHVO_REG_IDR, tahvo->ack);
+		tahvo->ack_pending = false;
+	}
+
+	mutex_unlock(&tahvo->mutex);
+}
+
+static void tahvo_irq_mask(struct irq_data *data)
+{
+	struct tahvo		*tahvo = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	tahvo->mask |= (1 << (irq - tahvo->irq_base));
+	tahvo->mask_pending = true;
+}
+
+static void tahvo_irq_unmask(struct irq_data *data)
+{
+	struct tahvo		*tahvo = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	tahvo->mask &= ~(1 << (irq - tahvo->irq_base));
+	tahvo->mask_pending = true;
+}
+
+static void tahvo_irq_ack(struct irq_data *data)
+{
+	struct tahvo		*tahvo = irq_data_get_irq_chip_data(data);
+	int			irq = data->irq;
+
+	tahvo->ack |= (1 << (irq - tahvo->irq_base));
+	tahvo->ack_pending = true;
+}
+
+static struct irq_chip tahvo_irq_chip = {
+	.name			= "tahvo",
+	.irq_bus_lock		= tahvo_irq_bus_lock,
+	.irq_bus_sync_unlock	= tahvo_irq_bus_sync_unlock,
+	.irq_mask		= tahvo_irq_mask,
+	.irq_unmask		= tahvo_irq_unmask,
+	.irq_ack		= tahvo_irq_ack,
+};
+
+static inline void tahvo_irq_setup(int irq)
+{
+#ifdef CONFIG_ARM
+	set_irq_flags(irq, IRQF_VALID);
+#else
+	irq_set_noprobe(irq);
+#endif
+}
+
+static void tahvo_irq_init(struct tahvo *tahvo)
+{
+	int			base = tahvo->irq_base;
+	int			end = tahvo->irq_end;
+	int			irq;
+
+	for (irq = base; irq < end; irq++) {
+		irq_set_chip_data(irq, tahvo);
+		irq_set_chip_and_handler(irq, &tahvo_irq_chip,
+				handle_simple_irq);
+		irq_set_nested_thread(irq, 1);
+		tahvo_irq_setup(irq);
+	}
+}
+
+/* -------------------------------------------------------------------------- */
+
+static struct resource generic_resources[] = {
+	{
+		.start		= -EINVAL,	/* fixed later */
+		.flags		= IORESOURCE_IRQ,
+	},
+};
+
+static struct device *tahvo_allocate_child(const char *name,
+		struct device *parent, int irq)
+{
+	struct platform_device	*pdev;
+	int			ret;
+
+	pdev = platform_device_alloc(name, -1);
+	if (!pdev) {
+		dev_dbg(parent, "can't allocate %s\n", name);
+		goto err0;
+	}
+
+	pdev->dev.parent = parent;
+
+	if (irq > 0) {
+		generic_resources[0].start = irq;
+
+		ret = platform_device_add_resources(pdev, generic_resources,
+				ARRAY_SIZE(generic_resources));
+		if (ret < 0) {
+			dev_dbg(parent, "can't add resources to %s\n", name);
+			goto err1;
+		}
+	}
+
+	ret = platform_device_add(pdev);
+	if (ret < 0) {
+		dev_dbg(parent, "can't add %s\n", name);
+		goto err1;
+	}
+
+	return &pdev->dev;
+
+err1:
+	platform_device_put(pdev);
+
+err0:
+	return NULL;
+}
+
+static int tahvo_allocate_children(struct device *parent, int irq_base)
+{
+	struct device		*child;
+
+	child = tahvo_allocate_child("tahvo-usb", parent,
+			irq_base + TAHVO_INT_VBUSON);
+	if (!child)
+		return -ENOMEM;
+
+	child = tahvo_allocate_child("tahvo-pwm", parent, -1);
+	if (!child)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __devinit tahvo_probe(struct platform_device *pdev)
+{
+	struct tahvo		*tahvo;
+	int			rev;
+	int			ret;
+	int			irq;
+	int			id;
+
+	tahvo = kzalloc(sizeof(*tahvo), GFP_KERNEL);
+	if (!tahvo) {
+		dev_err(&pdev->dev, "not enough memory\n");
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	platform_set_drvdata(pdev, tahvo);
+
+	mutex_init(&tahvo->mutex);
+
+	ret = irq_alloc_descs(-1, 0, MAX_TAHVO_IRQ_HANDLERS, 0);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to allocate IRQ descs\n");
+		goto err1;
+	}
+
+	tahvo->irq_base	= ret;
+	tahvo->irq_end	= ret + MAX_TAHVO_IRQ_HANDLERS;
+	tahvo->dev	= &pdev->dev;
+	tahvo->irq	= irq;
+
+	tahvo_irq_init(tahvo);
+
+	rev = __tahvo_read_reg(tahvo, TAHVO_REG_ASICR);
+
+	id = (rev >> 8) & 0xff;
+
+	if (id == 0x0b)
+		tahvo->is_betty = true;
+
+	ret = tahvo_allocate_children(&pdev->dev, tahvo->irq_base);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to allocate children\n");
+		goto err2;
+	}
+
+	dev_err(&pdev->dev, "%s v%d.%d found\n",
+			tahvo->is_betty ? "Betty" : "Tahvo",
+			(rev >> 4) & 0x0f, rev & 0x0f);
+
+	/* Mask all TAHVO interrupts */
+	__tahvo_write_reg(tahvo, TAHVO_REG_IMR, 0xffff);
+
+	ret = request_threaded_irq(irq, NULL, tahvo_irq_handler,
+			IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			"tahvo", tahvo);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Unable to register IRQ handler\n");
+		goto err2;
+	}
+
+	return 0;
+
+err2:
+	irq_free_descs(tahvo->irq_base, MAX_TAHVO_IRQ_HANDLERS);
+
+err1:
+	kfree(tahvo);
+
+err0:
+	return ret;
+}
+
+static int __devexit tahvo_remove(struct platform_device *pdev)
+{
+	struct tahvo		*tahvo = platform_get_drvdata(pdev);
+	int			irq;
+
+	irq = platform_get_irq(pdev, 0);
+
+	free_irq(irq, 0);
+	irq_free_descs(tahvo->irq_base, MAX_TAHVO_IRQ_HANDLERS);
+	kfree(tahvo);
+
+	return 0;
+}
+
+static struct platform_driver tahvo_driver = {
+	.probe		= tahvo_probe,
+	.remove		= __devexit_p(tahvo_remove),
+	.driver		= {
+		.name	= "tahvo",
+	},
+};
+
+static int __init tahvo_init(void)
+{
+	return platform_driver_register(&tahvo_driver);
+}
+subsys_initcall(tahvo_init);
+
+static void __exit tahvo_exit(void)
+{
+	platform_driver_unregister(&tahvo_driver);
+}
+module_exit(tahvo_exit);
+
+MODULE_DESCRIPTION("Tahvo ASIC control");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä");
+MODULE_AUTHOR("David Weinehall");
+MODULE_AUTHOR("Mikko Ylinen");
+
--- /dev/null
+++ b/drivers/cbus/tahvo.h
@@ -0,0 +1,58 @@
+/*
+ * drivers/cbus/tahvo.h
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
+ *	      David Weinehall <david.weinehall@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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
+ */
+
+#ifndef __DRIVERS_CBUS_TAHVO_H
+#define __DRIVERS_CBUS_TAHVO_H
+
+#include <linux/types.h>
+
+/* Registers */
+#define TAHVO_REG_ASICR		0x00	/* ASIC ID & revision */
+#define TAHVO_REG_IDR		0x01	/* Interrupt ID */
+#define TAHVO_REG_IDSR		0x02	/* Interrupt status */
+#define TAHVO_REG_IMR		0x03	/* Interrupt mask */
+#define TAHVO_REG_CHGCURR	0x04	/* Charge current control PWM (8-bit) */
+#define TAHVO_REG_LEDPWMR	0x05	/* LED PWM */
+#define TAHVO_REG_USBR		0x06	/* USB control */
+#define TAHVO_REG_CHGCTL	0x08	/* Charge control register */
+#define  TAHVO_REG_CHGCTL_EN		0x0001	/* Global charge enable */
+#define  TAHVO_REG_CHGCTL_PWMOVR	0x0004	/* PWM override. Force charge PWM to 0%/100% duty cycle. */
+#define  TAHVO_REG_CHGCTL_PWMOVRZERO	0x0008	/* If set, PWM override is 0% (If unset -> 100%) */
+#define  TAHVO_REG_CHGCTL_CURMEAS	0x0040	/* Enable battery current measurement. */
+#define  TAHVO_REG_CHGCTL_CURTIMRST	0x0080	/* Current measure timer reset. */
+#define TAHVO_REG_BATCURRTIMER	0x0c	/* Battery current measure timer (8-bit) */
+#define TAHVO_REG_BATCURR	0x0d	/* Battery (dis)charge current (signed 16-bit) */
+
+#define TAHVO_REG_MAX		0x0d
+
+/* Interrupt sources */
+#define TAHVO_INT_VBUSON	0
+#define TAHVO_INT_BATCURR	7 /* Battery current measure timer */
+
+#define MAX_TAHVO_IRQ_HANDLERS	8
+
+int tahvo_read_reg(struct device *child, unsigned reg);
+void tahvo_write_reg(struct device *child, unsigned reg, u16 val);
+void tahvo_set_clear_reg_bits(struct device *child, unsigned reg, u16 set,
+		u16 clear);
+
+#endif /* __DRIVERS_CBUS_TAHVO_H */
--- /dev/null
+++ b/drivers/cbus/tahvo-usb.c
@@ -0,0 +1,740 @@
+/**
+ * drivers/cbus/tahvo-usb.c
+ *
+ * Tahvo USB transeiver
+ *
+ * Copyright (C) 2005-2006 Nokia Corporation
+ *
+ * Parts copied from drivers/i2c/chips/isp1301_omap.c
+ * Copyright (C) 2004 Texas Instruments
+ * Copyright (C) 2004 David Brownell
+ *
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
+ *	      Tony Lindgren <tony@atomide.com>, and
+ *	      Timo Teräs <timo.teras@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/kobject.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+
+#include <asm/irq.h>
+#include <plat/usb.h>
+
+#include "cbus.h"
+#include "tahvo.h"
+
+#define DRIVER_NAME     "tahvo-usb"
+
+#define USBR_SLAVE_CONTROL	(1 << 8)
+#define USBR_VPPVIO_SW		(1 << 7)
+#define USBR_SPEED		(1 << 6)
+#define USBR_REGOUT		(1 << 5)
+#define USBR_MASTER_SW2		(1 << 4)
+#define USBR_MASTER_SW1		(1 << 3)
+#define USBR_SLAVE_SW		(1 << 2)
+#define USBR_NSUSPEND		(1 << 1)
+#define USBR_SEMODE		(1 << 0)
+
+/* bits in OTG_CTRL */
+
+/* Bits that are controlled by OMAP OTG and are read-only */
+#define OTG_CTRL_OMAP_MASK	(OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|\
+				OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
+/* Bits that are controlled by transceiver */
+#define OTG_CTRL_XCVR_MASK	(OTG_ASESSVLD|OTG_BSESSEND|\
+				OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
+/* Bits that are controlled by system */
+#define OTG_CTRL_SYS_MASK	(OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|\
+				OTG_B_HNPEN|OTG_BUSDROP)
+
+#if defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OTG)
+#error tahvo-otg.c does not work with OCHI yet!
+#endif
+
+#define TAHVO_MODE_HOST		0
+#define TAHVO_MODE_PERIPHERAL	1
+
+#ifdef CONFIG_USB_OTG
+#define TAHVO_MODE(tu)		(tu)->tahvo_mode
+#elif defined(CONFIG_USB_GADGET_OMAP)
+#define TAHVO_MODE(tu)		TAHVO_MODE_PERIPHERAL
+#else
+#define TAHVO_MODE(tu)		TAHVO_MODE_HOST
+#endif
+
+struct tahvo_usb {
+	struct device		*dev;
+	struct platform_device *pt_dev;
+	struct otg_transceiver otg;
+	int vbus_state;
+	struct mutex serialize;
+#ifdef CONFIG_USB_OTG
+	int tahvo_mode;
+#endif
+	struct clk *ick;
+
+	int		irq;
+};
+static struct tahvo_usb *tahvo_usb_device;
+
+/*
+ * ---------------------------------------------------------------------------
+ * OTG related functions
+ *
+ * These shoud be separated into omap-otg.c driver module, as they are used
+ * by various transceivers. These functions are needed in the UDC-only case
+ * as well. These functions are copied from GPL isp1301_omap.c
+ * ---------------------------------------------------------------------------
+ */
+static struct platform_device *tahvo_otg_dev;
+
+static irqreturn_t omap_otg_irq(int irq, void *arg)
+{
+	u16 otg_irq;
+
+	otg_irq = omap_readw(OTG_IRQ_SRC);
+	if (otg_irq & OPRT_CHG) {
+		omap_writew(OPRT_CHG, OTG_IRQ_SRC);
+	} else if (otg_irq & B_SRP_TMROUT) {
+		omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
+	} else if (otg_irq & B_HNP_FAIL) {
+		omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
+	} else if (otg_irq & A_SRP_DETECT) {
+		omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
+	} else if (otg_irq & A_REQ_TMROUT) {
+		omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
+	} else if (otg_irq & A_VBUS_ERR) {
+		omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
+	} else if (otg_irq & DRIVER_SWITCH) {
+#ifdef CONFIG_USB_OTG
+		if ((!(omap_readl(OTG_CTRL) & OTG_DRIVER_SEL)) &&
+		   tu->otg.host && tu->otg.state == OTG_STATE_A_HOST) {
+			/* role is host */
+			usb_bus_start_enum(tu->otg.host,
+					   tu->otg.host->otg_port);
+		}
+#endif
+		omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
+	} else
+		return IRQ_NONE;
+
+	return IRQ_HANDLED;
+
+}
+
+static int tahvo_otg_init(void)
+{
+	u32 l;
+
+#ifdef CONFIG_USB_OTG
+	if (!tahvo_otg_dev) {
+		printk("tahvo-usb: no tahvo_otg_dev\n");
+		return -ENODEV;
+	}
+#endif
+
+	l = omap_readl(OTG_SYSCON_1);
+	l &= ~OTG_IDLE_EN;
+	omap_writel(l, OTG_SYSCON_1);
+	udelay(100);
+
+	/* some of these values are board-specific... */
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN
+		/* for B-device: */
+		| SRP_GPDATA		/* 9msec Bdev D+ pulse */
+		| SRP_GPDVBUS		/* discharge after VBUS pulse */
+		// | (3 << 24)		/* 2msec VBUS pulse */
+		/* for A-device: */
+		| (0 << 20)		/* 200ms nominal A_WAIT_VRISE timer */
+		| SRP_DPW		/* detect 167+ns SRP pulses */
+		| SRP_DATA | SRP_VBUS;	/* accept both kinds of SRP pulse */
+	omap_writel(l, OTG_SYSCON_2);
+
+	omap_writew(DRIVER_SWITCH | OPRT_CHG
+			| B_SRP_TMROUT | B_HNP_FAIL
+				  | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT,
+					OTG_IRQ_EN);
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN;
+	omap_writel(l, OTG_SYSCON_2);
+
+	return 0;
+}
+
+static int __init omap_otg_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	tahvo_otg_dev = pdev;
+	ret = tahvo_otg_init();
+	if (ret != 0) {
+		printk(KERN_ERR "tahvo-usb: tahvo_otg_init failed\n");
+		return ret;
+	}
+
+	return request_irq(tahvo_otg_dev->resource[1].start,
+			   omap_otg_irq, IRQF_DISABLED, DRIVER_NAME,
+			   tahvo_usb_device);
+}
+
+static int __exit omap_otg_remove(struct platform_device *pdev)
+{
+	free_irq(tahvo_otg_dev->resource[1].start, tahvo_usb_device);
+	tahvo_otg_dev = NULL;
+
+	return 0;
+}
+
+struct platform_driver omap_otg_driver = {
+	.driver		= {
+		.name	= "omap_otg",
+	},
+	.remove		= __exit_p(omap_otg_remove),
+};
+
+/*
+ * ---------------------------------------------------------------------------
+ * Tahvo related functions
+ * These are Nokia proprietary code, except for the OTG register settings,
+ * which are copied from isp1301.c
+ * ---------------------------------------------------------------------------
+ */
+static ssize_t vbus_state_show(struct device *device,
+			       struct device_attribute *attr, char *buf)
+{
+	struct tahvo_usb *tu = dev_get_drvdata(device);
+	return sprintf(buf, "%d\n", tu->vbus_state);
+}
+static DEVICE_ATTR(vbus_state, 0444, vbus_state_show, NULL);
+
+int vbus_active = 0;
+
+static void check_vbus_state(struct tahvo_usb *tu)
+{
+	int reg, prev_state;
+
+	reg = tahvo_read_reg(tu->dev, TAHVO_REG_IDSR);
+	if (reg & 0x01) {
+		u32 l;
+
+		vbus_active = 1;
+		switch (tu->otg.state) {
+		case OTG_STATE_B_IDLE:
+			/* Enable the gadget driver */
+			if (tu->otg.gadget)
+				usb_gadget_vbus_connect(tu->otg.gadget);
+			/* Set B-session valid and not B-sessio ended to indicate
+			 * Vbus to be ok. */
+			l = omap_readl(OTG_CTRL);
+			l &= ~OTG_BSESSEND;
+			l |= OTG_BSESSVLD;
+			omap_writel(l, OTG_CTRL);
+
+			tu->otg.state = OTG_STATE_B_PERIPHERAL;
+			break;
+		case OTG_STATE_A_IDLE:
+			/* Session is now valid assuming the USB hub is driving Vbus */
+			tu->otg.state = OTG_STATE_A_HOST;
+			break;
+		default:
+			break;
+		}
+		printk("USB cable connected\n");
+	} else {
+		switch (tu->otg.state) {
+		case OTG_STATE_B_PERIPHERAL:
+			if (tu->otg.gadget)
+				usb_gadget_vbus_disconnect(tu->otg.gadget);
+			tu->otg.state = OTG_STATE_B_IDLE;
+			break;
+		case OTG_STATE_A_HOST:
+			tu->otg.state = OTG_STATE_A_IDLE;
+			break;
+		default:
+			break;
+		}
+		printk("USB cable disconnected\n");
+		vbus_active = 0;
+	}
+
+	prev_state = tu->vbus_state;
+	tu->vbus_state = reg & 0x01;
+	if (prev_state != tu->vbus_state)
+		sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state");
+}
+
+static void tahvo_usb_become_host(struct tahvo_usb *tu)
+{
+	u32 l;
+
+	/* Clear system and transceiver controlled bits
+	 * also mark the A-session is always valid */
+	tahvo_otg_init();
+
+	l = omap_readl(OTG_CTRL);
+	l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK);
+	l |= OTG_ASESSVLD;
+	omap_writel(l, OTG_CTRL);
+
+	/* Power up the transceiver in USB host mode */
+	tahvo_write_reg(tu->dev, TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND |
+			USBR_MASTER_SW2 | USBR_MASTER_SW1);
+	tu->otg.state = OTG_STATE_A_IDLE;
+
+	check_vbus_state(tu);
+}
+
+static void tahvo_usb_stop_host(struct tahvo_usb *tu)
+{
+	tu->otg.state = OTG_STATE_A_IDLE;
+}
+
+static void tahvo_usb_become_peripheral(struct tahvo_usb *tu)
+{
+	u32 l;
+
+	/* Clear system and transceiver controlled bits
+	 * and enable ID to mark peripheral mode and
+	 * BSESSEND to mark no Vbus */
+	tahvo_otg_init();
+	l = omap_readl(OTG_CTRL);
+	l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD);
+	l |= OTG_ID | OTG_BSESSEND;
+	omap_writel(l, OTG_CTRL);
+
+	/* Power up transceiver and set it in USB perhiperal mode */
+	tahvo_write_reg(tu->dev, TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT | USBR_NSUSPEND | USBR_SLAVE_SW);
+	tu->otg.state = OTG_STATE_B_IDLE;
+
+	check_vbus_state(tu);
+}
+
+static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu)
+{
+	u32 l;
+
+	l = omap_readl(OTG_CTRL);
+	l &= ~OTG_BSESSVLD;
+	l |= OTG_BSESSEND;
+	omap_writel(l, OTG_CTRL);
+
+	if (tu->otg.gadget)
+		usb_gadget_vbus_disconnect(tu->otg.gadget);
+	tu->otg.state = OTG_STATE_B_IDLE;
+
+}
+
+static void tahvo_usb_power_off(struct tahvo_usb *tu)
+{
+	u32 l;
+	int id;
+
+	/* Disable gadget controller if any */
+	if (tu->otg.gadget)
+		usb_gadget_vbus_disconnect(tu->otg.gadget);
+
+	/* Disable OTG and interrupts */
+	if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
+		id = OTG_ID;
+	else
+		id = 0;
+	l = omap_readl(OTG_CTRL);
+	l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD);
+	l |= id | OTG_BSESSEND;
+	omap_writel(l, OTG_CTRL);
+	omap_writew(0, OTG_IRQ_EN);
+
+	l = omap_readl(OTG_SYSCON_2);
+	l &= ~OTG_EN;
+	omap_writel(l, OTG_SYSCON_2);
+
+	l = omap_readl(OTG_SYSCON_1);
+	l |= OTG_IDLE_EN;
+	omap_writel(l, OTG_SYSCON_1);
+
+	/* Power off transceiver */
+	tahvo_write_reg(tu->dev, TAHVO_REG_USBR, 0);
+	tu->otg.state = OTG_STATE_UNDEFINED;
+}
+
+
+static int tahvo_usb_set_power(struct otg_transceiver *dev, unsigned mA)
+{
+	struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
+
+	dev_dbg(&tu->pt_dev->dev, "set_power %d mA\n", mA);
+
+	if (dev->state == OTG_STATE_B_PERIPHERAL) {
+		/* REVISIT: Can Tahvo charge battery from VBUS? */
+	}
+	return 0;
+}
+
+static int tahvo_usb_set_suspend(struct otg_transceiver *dev, int suspend)
+{
+	struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
+	u16 w;
+
+	dev_dbg(&tu->pt_dev->dev, "set_suspend\n");
+
+	w = tahvo_read_reg(tu->dev, TAHVO_REG_USBR);
+	if (suspend)
+		w &= ~USBR_NSUSPEND;
+	else
+		w |= USBR_NSUSPEND;
+	tahvo_write_reg(tu->dev, TAHVO_REG_USBR, w);
+
+	return 0;
+}
+
+static int tahvo_usb_start_srp(struct otg_transceiver *dev)
+{
+	struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
+	u32 otg_ctrl;
+
+	dev_dbg(&tu->pt_dev->dev, "start_srp\n");
+
+	if (!dev || tu->otg.state != OTG_STATE_B_IDLE)
+		return -ENODEV;
+
+	otg_ctrl = omap_readl(OTG_CTRL);
+	if (!(otg_ctrl & OTG_BSESSEND))
+		return -EINVAL;
+
+	otg_ctrl |= OTG_B_BUSREQ;
+	otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_SYS_MASK;
+	omap_writel(otg_ctrl, OTG_CTRL);
+	tu->otg.state = OTG_STATE_B_SRP_INIT;
+
+	return 0;
+}
+
+static int tahvo_usb_start_hnp(struct otg_transceiver *otg)
+{
+	struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
+
+	dev_dbg(&tu->pt_dev->dev, "start_hnp\n");
+#ifdef CONFIG_USB_OTG
+	/* REVISIT: Add this for OTG */
+#endif
+	return -EINVAL;
+}
+
+static int tahvo_usb_set_host(struct otg_transceiver *otg, struct usb_bus *host)
+{
+	struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
+	u32 l;
+
+	dev_dbg(&tu->pt_dev->dev, "set_host %p\n", host);
+
+	if (otg == NULL)
+		return -ENODEV;
+
+#if defined(CONFIG_USB_OTG) || !defined(CONFIG_USB_GADGET_OMAP)
+
+	mutex_lock(&tu->serialize);
+
+	if (host == NULL) {
+		if (TAHVO_MODE(tu) == TAHVO_MODE_HOST)
+			tahvo_usb_power_off(tu);
+		tu->otg.host = NULL;
+		mutex_unlock(&tu->serialize);
+		return 0;
+	}
+
+	l = omap_readl(OTG_SYSCON_1);
+	l &= ~(OTG_IDLE_EN | HST_IDLE_EN | DEV_IDLE_EN);
+	omap_writel(l, OTG_SYSCON_1);
+
+	if (TAHVO_MODE(tu) == TAHVO_MODE_HOST) {
+		tu->otg.host = NULL;
+		tahvo_usb_become_host(tu);
+	}
+
+	tu->otg.host = host;
+
+	mutex_unlock(&tu->serialize);
+#else
+	/* No host mode configured, so do not allow host controlled to be set */
+	return -EINVAL;
+#endif
+
+	return 0;
+}
+
+static int tahvo_usb_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
+{
+	struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
+
+	dev_dbg(&tu->pt_dev->dev, "set_peripheral %p\n", gadget);
+
+	if (!otg)
+		return -ENODEV;
+
+#if defined(CONFIG_USB_OTG) || defined(CONFIG_USB_GADGET_OMAP)
+
+	mutex_lock(&tu->serialize);
+
+	if (!gadget) {
+		if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
+			tahvo_usb_power_off(tu);
+		tu->otg.gadget = NULL;
+		mutex_unlock(&tu->serialize);
+		return 0;
+	}
+
+	tu->otg.gadget = gadget;
+	if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
+		tahvo_usb_become_peripheral(tu);
+
+	mutex_unlock(&tu->serialize);
+#else
+	/* No gadget mode configured, so do not allow host controlled to be set */
+	return -EINVAL;
+#endif
+
+	return 0;
+}
+
+static irqreturn_t tahvo_usb_vbus_interrupt(int irq, void *_tu)
+{
+	struct tahvo_usb *tu = _tu;
+
+	check_vbus_state(tu);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_USB_OTG
+static ssize_t otg_mode_show(struct device *device,
+			     struct device_attribute *attr, char *buf)
+{
+	struct tahvo_usb *tu = dev_get_drvdata(device);
+	switch (tu->tahvo_mode) {
+	case TAHVO_MODE_HOST:
+		return sprintf(buf, "host\n");
+	case TAHVO_MODE_PERIPHERAL:
+		return sprintf(buf, "peripheral\n");
+	}
+	return sprintf(buf, "unknown\n");
+}
+
+static ssize_t otg_mode_store(struct device *device,
+			      struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct tahvo_usb *tu = dev_get_drvdata(device);
+	int r;
+
+	r = strlen(buf);
+	mutex_lock(&tu->serialize);
+	if (strncmp(buf, "host", 4) == 0) {
+		if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
+			tahvo_usb_stop_peripheral(tu);
+		tu->tahvo_mode = TAHVO_MODE_HOST;
+		if (tu->otg.host) {
+			printk(KERN_INFO "Selected HOST mode: host controller present.\n");
+			tahvo_usb_become_host(tu);
+		} else {
+			printk(KERN_INFO "Selected HOST mode: no host controller, powering off.\n");
+			tahvo_usb_power_off(tu);
+		}
+	} else if (strncmp(buf, "peripheral", 10) == 0) {
+		if (tu->tahvo_mode == TAHVO_MODE_HOST)
+			tahvo_usb_stop_host(tu);
+		tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
+		if (tu->otg.gadget) {
+			printk(KERN_INFO "Selected PERIPHERAL mode: gadget driver present.\n");
+			tahvo_usb_become_peripheral(tu);
+		} else {
+			printk(KERN_INFO "Selected PERIPHERAL mode: no gadget driver, powering off.\n");
+			tahvo_usb_power_off(tu);
+		}
+	} else
+		r = -EINVAL;
+
+	mutex_unlock(&tu->serialize);
+	return r;
+}
+
+static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store);
+#endif
+
+static int __init tahvo_usb_probe(struct platform_device *pdev)
+{
+	struct tahvo_usb *tu;
+	struct device *dev = &pdev->dev;
+	int ret;
+	int irq;
+
+	dev_dbg(dev, "probe\n");
+
+	/* Create driver data */
+	tu = kzalloc(sizeof(*tu), GFP_KERNEL);
+	if (!tu)
+		return -ENOMEM;
+	tahvo_usb_device = tu;
+
+	tu->dev = dev;
+	tu->pt_dev = pdev;
+#ifdef CONFIG_USB_OTG
+	/* Default mode */
+#ifdef CONFIG_CBUS_TAHVO_USB_HOST_BY_DEFAULT
+	tu->tahvo_mode = TAHVO_MODE_HOST;
+#else
+	tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
+#endif
+#endif
+
+	mutex_init(&tu->serialize);
+
+	tu->ick = clk_get(NULL, "usb_l4_ick");
+	if (IS_ERR(tu->ick)) {
+		dev_err(dev, "Failed to get usb_l4_ick\n");
+		ret = PTR_ERR(tu->ick);
+		goto err_free_tu;
+	}
+	clk_enable(tu->ick);
+
+	/* Set initial state, so that we generate kevents only on
+	 * state changes */
+	tu->vbus_state = tahvo_read_reg(tu->dev, TAHVO_REG_IDSR) & 0x01;
+
+	irq = platform_get_irq(pdev, 0);
+	tu->irq = irq;
+
+	/* We cannot enable interrupt until omap_udc is initialized */
+	ret = request_threaded_irq(irq, NULL, tahvo_usb_vbus_interrupt,
+			IRQF_ONESHOT, "tahvo-vbus", tu);
+	if (ret != 0) {
+		printk(KERN_ERR "Could not register Tahvo interrupt for VBUS\n");
+		goto err_release_clk;
+	}
+
+	/* Attributes */
+	ret = device_create_file(dev, &dev_attr_vbus_state);
+#ifdef CONFIG_USB_OTG
+	ret |= device_create_file(dev, &dev_attr_otg_mode);
+#endif
+	if (ret)
+		printk(KERN_ERR "attribute creation failed: %d\n", ret);
+
+	/* Create OTG interface */
+	tahvo_usb_power_off(tu);
+	tu->otg.state = OTG_STATE_UNDEFINED;
+	tu->otg.label = DRIVER_NAME;
+	tu->otg.set_host = tahvo_usb_set_host;
+	tu->otg.set_peripheral = tahvo_usb_set_peripheral;
+	tu->otg.set_power = tahvo_usb_set_power;
+	tu->otg.set_suspend = tahvo_usb_set_suspend;
+	tu->otg.start_srp = tahvo_usb_start_srp;
+	tu->otg.start_hnp = tahvo_usb_start_hnp;
+
+	ret = otg_set_transceiver(&tu->otg);
+	if (ret < 0) {
+		printk(KERN_ERR "Cannot register USB transceiver\n");
+		goto err_free_irq;
+	}
+
+	dev_set_drvdata(dev, tu);
+
+	return 0;
+
+err_free_irq:
+	free_irq(tu->irq, tu);
+err_release_clk:
+	clk_disable(tu->ick);
+	clk_put(tu->ick);
+err_free_tu:
+	kfree(tu);
+	tahvo_usb_device = NULL;
+
+	return ret;
+}
+
+static int __exit tahvo_usb_remove(struct platform_device *pdev)
+{
+	struct tahvo_usb *tu = platform_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "remove\n");
+
+	free_irq(tu->irq, tu);
+	flush_scheduled_work();
+	otg_set_transceiver(0);
+	device_remove_file(&pdev->dev, &dev_attr_vbus_state);
+#ifdef CONFIG_USB_OTG
+	device_remove_file(&pdev->dev, &dev_attr_otg_mode);
+#endif
+	clk_disable(tu->ick);
+	clk_put(tu->ick);
+
+	kfree(tu);
+	tahvo_usb_device = NULL;
+
+	return 0;
+}
+
+static struct platform_driver tahvo_usb_driver = {
+	.driver		= {
+		.name	= "tahvo-usb",
+	},
+	.remove		= __exit_p(tahvo_usb_remove),
+};
+
+static int __init tahvo_usb_init(void)
+{
+	int ret = 0;
+
+	ret = platform_driver_probe(&tahvo_usb_driver, tahvo_usb_probe);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_probe(&omap_otg_driver, omap_otg_probe);
+	if (ret) {
+		platform_driver_unregister(&tahvo_usb_driver);
+		return ret;
+	}
+
+	return 0;
+}
+
+subsys_initcall(tahvo_usb_init);
+
+static void __exit tahvo_usb_exit(void)
+{
+	platform_driver_unregister(&omap_otg_driver);
+	platform_driver_unregister(&tahvo_usb_driver);
+}
+module_exit(tahvo_usb_exit);
+
+MODULE_DESCRIPTION("Tahvo USB OTG Transceiver Driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -78,7 +78,7 @@ obj-$(CONFIG_GAMEPORT)		+= input/gamepor
 obj-$(CONFIG_INPUT)		+= input/
 obj-$(CONFIG_I2O)		+= message/
 obj-$(CONFIG_RTC_LIB)		+= rtc/
-obj-y				+= i2c/ media/
+obj-y				+= i2c/ media/ cbus/
 obj-$(CONFIG_PPS)		+= pps/
 obj-$(CONFIG_PTP_1588_CLOCK)	+= ptp/
 obj-$(CONFIG_W1)		+= w1/
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -2,6 +2,8 @@ menu "Device Drivers"
 
 source "drivers/base/Kconfig"
 
+source "drivers/cbus/Kconfig"
+
 source "drivers/connector/Kconfig"
 
 source "drivers/mtd/Kconfig"