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openwrt-xburst/target/linux/omap24xx/patches-3.3/250-cbus.patch
juhosg 2d3a55136a omap24xx: add support for 3.3 
Compile tested only.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31810 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-05-18 20:22:32 +00:00

3464 lines
86 KiB
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--- /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"
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