ExternalVendorCode/openwrt
1
0
Fork 0
mirror of https://github.com/openwrt/openwrt.git synced 2024-12-30 10:39:04 +00:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity
29fd37780b
openwrt/target/linux/omap24xx/patches-2.6.37/500-cbus.patch
Michael Büsch 444541f6f8 omap24xx: Refresh 2.6.37 patches 
SVN-Revision: 25143
2011-01-27 13:19:03 +00:00

4658 lines
117 KiB
Diff
Raw Blame History

---
arch/arm/Kconfig | 4
drivers/Makefile | 2
drivers/cbus/Kconfig | 89 ++++
drivers/cbus/Makefile | 14
drivers/cbus/cbus.c | 309 ++++++++++++++++
drivers/cbus/cbus.h | 36 +
drivers/cbus/retu-headset.c | 356 ++++++++++++++++++
drivers/cbus/retu-pwrbutton.c | 118 ++++++
drivers/cbus/retu-rtc.c | 477 ++++++++++++++++++++++++
drivers/cbus/retu-user.c | 424 ++++++++++++++++++++++
drivers/cbus/retu-wdt.c | 387 ++++++++++++++++++++
drivers/cbus/retu.c | 468 ++++++++++++++++++++++++
drivers/cbus/retu.h | 77 ++++
drivers/cbus/tahvo-usb.c | 788 +++++++++++++++++++++++++++++++++++++++++
drivers/cbus/tahvo-user.c | 406 +++++++++++++++++++++
drivers/cbus/tahvo.c | 443 +++++++++++++++++++++++
drivers/cbus/tahvo.h | 61 +++
drivers/cbus/user_retu_tahvo.h | 75 +++
18 files changed, 4533 insertions(+), 1 deletion(-)
Index: linux-2.6.37/drivers/cbus/cbus.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/cbus.c 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,309 @@
+/*
+ * drivers/cbus/cbus.c
+ *
+ * Support functions for CBUS serial protocol
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/mach-types.h>
+
+#include <plat/board.h>
+#include <plat/cbus.h>
+
+#include "cbus.h"
+
+struct cbus_host *cbus_host = NULL;
+EXPORT_SYMBOL(cbus_host);
+
+#ifdef CONFIG_ARCH_OMAP1
+/* We use our own MPUIO functions to get closer to 1MHz bus speed */
+
+static inline void cbus_set_gpio_direction(u32 base, int mpuio, int is_input)
+{
+ u16 w;
+
+ mpuio &= 0x0f;
+ w = __raw_readw(base + OMAP_MPUIO_IO_CNTL);
+ if (is_input)
+ w |= 1 << mpuio;
+ else
+ w &= ~(1 << mpuio);
+ __raw_writew(w, base + OMAP_MPUIO_IO_CNTL);
+
+}
+
+static inline void cbus_set_gpio_dataout(u32 base, int mpuio, int enable)
+{
+ u16 w;
+
+ mpuio &= 0x0f;
+ w = __raw_readw(base + OMAP_MPUIO_OUTPUT);
+ if (enable)
+ w |= 1 << mpuio;
+ else
+ w &= ~(1 << mpuio);
+ __raw_writew(w, base + OMAP_MPUIO_OUTPUT);
+}
+
+static inline int cbus_get_gpio_datain(u32 base, int mpuio)
+{
+ mpuio &= 0x0f;
+
+ return (__raw_readw(base + OMAP_MPUIO_INPUT_LATCH) & (1 << mpuio)) != 0;
+}
+
+static void cbus_send_bit(struct cbus_host *host, u32 base, int bit,
+ int set_to_input)
+{
+ cbus_set_gpio_dataout(base, host->dat_gpio, bit ? 1 : 0);
+ cbus_set_gpio_dataout(base, host->clk_gpio, 1);
+
+ /* The data bit is read on the rising edge of CLK */
+ if (set_to_input)
+ cbus_set_gpio_direction(base, host->dat_gpio, 1);
+
+ cbus_set_gpio_dataout(base, host->clk_gpio, 0);
+}
+
+static u8 cbus_receive_bit(struct cbus_host *host, u32 base)
+{
+ u8 ret;
+
+ cbus_set_gpio_dataout(base, host->clk_gpio, 1);
+ ret = cbus_get_gpio_datain(base, host->dat_gpio);
+ cbus_set_gpio_dataout(base, host->clk_gpio, 0);
+
+ return ret;
+}
+
+#define cbus_output(base, gpio, val) cbus_set_gpio_direction(base, gpio, 0)
+
+#else
+
+#define cbus_output(base, gpio, val) gpio_direction_output(gpio, val)
+#define cbus_set_gpio_dataout(base, gpio, enable) gpio_set_value(gpio, enable)
+#define cbus_get_gpio_datain(base, int, gpio) gpio_get_value(gpio)
+
+static void _cbus_send_bit(struct cbus_host *host, int bit, int set_to_input)
+{
+ 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 (set_to_input)
+ gpio_direction_input(host->dat_gpio);
+
+ gpio_set_value(host->clk_gpio, 0);
+}
+
+static u8 _cbus_receive_bit(struct cbus_host *host)
+{
+ u8 ret;
+
+ gpio_set_value(host->clk_gpio, 1);
+ ret = gpio_get_value(host->dat_gpio);
+ gpio_set_value(host->clk_gpio, 0);
+
+ return ret;
+}
+
+#define cbus_send_bit(host, base, bit, set_to_input) _cbus_send_bit(host, bit, set_to_input)
+#define cbus_receive_bit(host, base) _cbus_receive_bit(host)
+
+#endif
+
+static int cbus_transfer(struct cbus_host *host, int dev, int reg, int data)
+{
+ int i;
+ int is_read = 0;
+ unsigned long flags;
+ u32 base;
+
+#ifdef CONFIG_ARCH_OMAP1
+ base = OMAP1_IO_ADDRESS(OMAP1_MPUIO_BASE);
+#else
+ base = 0;
+#endif
+
+ if (data < 0)
+ is_read = 1;
+
+ /* 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 */
+ cbus_set_gpio_dataout(base, host->sel_gpio, 0);
+
+ /* Set the DAT pin to output */
+ cbus_output(base, host->dat_gpio, 1);
+
+ /* Send the device address */
+ for (i = 3; i > 0; i--)
+ cbus_send_bit(host, base, dev & (1 << (i - 1)), 0);
+
+ /* Send the rw flag */
+ cbus_send_bit(host, base, is_read, 0);
+
+ /* Send the register address */
+ for (i = 5; i > 0; i--) {
+ int set_to_input = 0;
+
+ if (is_read && i == 1)
+ set_to_input = 1;
+
+ cbus_send_bit(host, base, reg & (1 << (i - 1)), set_to_input);
+ }
+
+ if (!is_read) {
+ for (i = 16; i > 0; i--)
+ cbus_send_bit(host, base, data & (1 << (i - 1)), 0);
+ } else {
+ cbus_set_gpio_dataout(base, host->clk_gpio, 1);
+ data = 0;
+
+ for (i = 16; i > 0; i--) {
+ u8 bit = cbus_receive_bit(host, base);
+
+ if (bit)
+ data |= 1 << (i - 1);
+ }
+ }
+
+ /* Indicate end of transfer, SEL goes up until next transfer */
+ cbus_set_gpio_dataout(base, host->sel_gpio, 1);
+ cbus_set_gpio_dataout(base, host->clk_gpio, 1);
+ cbus_set_gpio_dataout(base, host->clk_gpio, 0);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return is_read ? data : 0;
+}
+
+/*
+ * Read a given register from the device
+ */
+int cbus_read_reg(struct cbus_host *host, int dev, int reg)
+{
+ return cbus_host ? cbus_transfer(host, dev, reg, -1) : -ENODEV;
+}
+EXPORT_SYMBOL(cbus_read_reg);
+
+/*
+ * Write to a given register of the device
+ */
+int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val)
+{
+ return cbus_host ? cbus_transfer(host, dev, reg, (int)val) : -ENODEV;
+}
+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;
+
+ if ((ret = gpio_request(chost->clk_gpio, "CBUS clk")) < 0)
+ goto exit1;
+
+ if ((ret = gpio_request(chost->dat_gpio, "CBUS data")) < 0)
+ goto exit2;
+
+ if ((ret = gpio_request(chost->sel_gpio, "CBUS sel")) < 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);
+
+ cbus_host = 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->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");
+
Index: linux-2.6.37/drivers/cbus/cbus.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/cbus.h 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,36 @@
+/*
+ * 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
+
+struct cbus_host {
+ int clk_gpio, dat_gpio, sel_gpio;
+ spinlock_t lock;
+};
+
+extern struct cbus_host *cbus_host;
+
+extern int cbus_read_reg(struct cbus_host *host, int dev, int reg);
+extern int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val);
+
+#endif /* __DRIVERS_CBUS_CBUS_H */
Index: linux-2.6.37/drivers/cbus/Kconfig
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/Kconfig 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,89 @@
+#
+# CBUS device configuration
+#
+
+menu "CBUS support"
+
+config CBUS
+ depends on ARCH_OMAP
+ 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.
+
+config CBUS_TAHVO_USER
+ depends on CBUS_TAHVO
+ bool "Support for Tahvo user space functions"
+ ---help---
+ If you want support for Tahvo's user space read/write etc. functions,
+ you should say Y here.
+
+config CBUS_TAHVO_USB
+ depends on CBUS_TAHVO && USB
+ 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.
+
+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.
+
+config CBUS_RETU_USER
+ depends on CBUS_RETU
+ bool "Support for Retu user space functions"
+ ---help---
+ If you want support for Retu's user space read/write etc. functions,
+ you should say Y here.
+
+config CBUS_RETU_POWERBUTTON
+ depends on CBUS_RETU
+ 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 CBUS_RETU && SYSFS
+ 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 CBUS_RETU && SYSFS && WATCHDOG
+ 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 CBUS_RETU && 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.
+
+endmenu
Index: linux-2.6.37/drivers/cbus/Makefile
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/Makefile 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,14 @@
+#
+# 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_TAHVO_USER) += tahvo-user.o
+obj-$(CONFIG_CBUS_RETU_USER) += retu-user.o
+obj-$(CONFIG_CBUS_RETU_HEADSET) += retu-headset.o
Index: linux-2.6.37/drivers/cbus/retu.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu.c 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,468 @@
+/**
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <asm/uaccess.h>
+#include <asm/mach-types.h>
+
+#include <plat/mux.h>
+#include <plat/board.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+#define RETU_ID 0x01
+#define PFX "retu: "
+
+static int retu_initialized;
+static int retu_irq_pin;
+static int retu_is_vilma;
+
+static struct tasklet_struct retu_tasklet;
+spinlock_t retu_lock = SPIN_LOCK_UNLOCKED;
+
+static struct completion device_release;
+
+struct retu_irq_handler_desc {
+ int (*func)(unsigned long);
+ unsigned long arg;
+ char name[8];
+};
+
+static struct retu_irq_handler_desc retu_irq_handlers[MAX_RETU_IRQ_HANDLERS];
+
+/**
+ * retu_read_reg - Read a value from a register in Retu
+ * @reg: the register to read from
+ *
+ * This function returns the contents of the specified register
+ */
+int retu_read_reg(int reg)
+{
+ BUG_ON(!retu_initialized);
+ return cbus_read_reg(cbus_host, RETU_ID, reg);
+}
+
+/**
+ * retu_write_reg - Write a value to a register in Retu
+ * @reg: the register to write to
+ * @reg: the value to write to the register
+ *
+ * This function writes a value to the specified register
+ */
+void retu_write_reg(int reg, u16 val)
+{
+ BUG_ON(!retu_initialized);
+ cbus_write_reg(cbus_host, RETU_ID, reg, val);
+}
+
+void retu_set_clear_reg_bits(int reg, u16 set, u16 clear)
+{
+ unsigned long flags;
+ u16 w;
+
+ spin_lock_irqsave(&retu_lock, flags);
+ w = retu_read_reg(reg);
+ w &= ~clear;
+ w |= set;
+ retu_write_reg(reg, w);
+ spin_unlock_irqrestore(&retu_lock, flags);
+}
+
+#define ADC_MAX_CHAN_NUMBER 13
+
+int retu_read_adc(int channel)
+{
+ unsigned long flags;
+ int res;
+
+ if (channel < 0 || channel > ADC_MAX_CHAN_NUMBER)
+ return -EINVAL;
+
+ spin_lock_irqsave(&retu_lock, flags);
+
+ if ((channel == 8) && retu_is_vilma) {
+ int scr = retu_read_reg(RETU_REG_ADCSCR);
+ int ch = (retu_read_reg(RETU_REG_ADCR) >> 10) & 0xf;
+ if (((scr & 0xff) != 0) && (ch != 8))
+ retu_write_reg (RETU_REG_ADCSCR, (scr & ~0xff));
+ }
+
+ /* Select the channel and read result */
+ retu_write_reg(RETU_REG_ADCR, channel << 10);
+ res = retu_read_reg(RETU_REG_ADCR) & 0x3ff;
+
+ if (retu_is_vilma)
+ retu_write_reg(RETU_REG_ADCR, (1 << 13));
+
+ /* Unlock retu */
+ spin_unlock_irqrestore(&retu_lock, flags);
+
+ return res;
+}
+
+
+static u16 retu_disable_bogus_irqs(u16 mask)
+{
+ int i;
+
+ for (i = 0; i < MAX_RETU_IRQ_HANDLERS; i++) {
+ if (mask & (1 << i))
+ continue;
+ if (retu_irq_handlers[i].func != NULL)
+ continue;
+ /* an IRQ was enabled but we don't have a handler for it */
+ printk(KERN_INFO PFX "disabling bogus IRQ %d\n", i);
+ mask |= (1 << i);
+ }
+ return mask;
+}
+
+/*
+ * Disable given RETU interrupt
+ */
+void retu_disable_irq(int id)
+{
+ unsigned long flags;
+ u16 mask;
+
+ spin_lock_irqsave(&retu_lock, flags);
+ mask = retu_read_reg(RETU_REG_IMR);
+ mask |= 1 << id;
+ mask = retu_disable_bogus_irqs(mask);
+ retu_write_reg(RETU_REG_IMR, mask);
+ spin_unlock_irqrestore(&retu_lock, flags);
+}
+
+/*
+ * Enable given RETU interrupt
+ */
+void retu_enable_irq(int id)
+{
+ unsigned long flags;
+ u16 mask;
+
+ if (id == 3) {
+ printk("Enabling Retu IRQ %d\n", id);
+ dump_stack();
+ }
+ spin_lock_irqsave(&retu_lock, flags);
+ mask = retu_read_reg(RETU_REG_IMR);
+ mask &= ~(1 << id);
+ mask = retu_disable_bogus_irqs(mask);
+ retu_write_reg(RETU_REG_IMR, mask);
+ spin_unlock_irqrestore(&retu_lock, flags);
+}
+
+/*
+ * Acknowledge given RETU interrupt
+ */
+void retu_ack_irq(int id)
+{
+ retu_write_reg(RETU_REG_IDR, 1 << id);
+}
+
+/*
+ * RETU interrupt handler. Only schedules the tasklet.
+ */
+static irqreturn_t retu_irq_handler(int irq, void *dev_id)
+{
+ tasklet_schedule(&retu_tasklet);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Tasklet handler
+ */
+static void retu_tasklet_handler(unsigned long data)
+{
+ struct retu_irq_handler_desc *hnd;
+ u16 id;
+ u16 im;
+ int i;
+
+ for (;;) {
+ id = retu_read_reg(RETU_REG_IDR);
+ im = ~retu_read_reg(RETU_REG_IMR);
+ id &= im;
+
+ if (!id)
+ break;
+
+ for (i = 0; id != 0; i++, id >>= 1) {
+ if (!(id & 1))
+ continue;
+ hnd = &retu_irq_handlers[i];
+ if (hnd->func == NULL) {
+ /* Spurious retu interrupt - disable and ack it */
+ printk(KERN_INFO "Spurious Retu interrupt "
+ "(id %d)\n", i);
+ retu_disable_irq(i);
+ retu_ack_irq(i);
+ continue;
+ }
+ hnd->func(hnd->arg);
+ /*
+ * Don't acknowledge the interrupt here
+ * It must be done explicitly
+ */
+ }
+ }
+}
+
+/*
+ * Register the handler for a given RETU interrupt source.
+ */
+int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name)
+{
+ struct retu_irq_handler_desc *hnd;
+
+ if (irq_handler == NULL || id >= MAX_RETU_IRQ_HANDLERS ||
+ name == NULL) {
+ printk(KERN_ERR PFX "Invalid arguments to %s\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+ hnd = &retu_irq_handlers[id];
+ if (hnd->func != NULL) {
+ printk(KERN_ERR PFX "IRQ %d already reserved\n", id);
+ return -EBUSY;
+ }
+ printk(KERN_INFO PFX "Registering interrupt %d for device %s\n",
+ id, name);
+ hnd->func = irq_handler;
+ hnd->arg = arg;
+ strlcpy(hnd->name, name, sizeof(hnd->name));
+
+ retu_ack_irq(id);
+ retu_enable_irq(id);
+
+ return 0;
+}
+
+/*
+ * Unregister the handler for a given RETU interrupt source.
+ */
+void retu_free_irq(int id)
+{
+ struct retu_irq_handler_desc *hnd;
+
+ if (id >= MAX_RETU_IRQ_HANDLERS) {
+ printk(KERN_ERR PFX "Invalid argument to %s\n",
+ __FUNCTION__);
+ return;
+ }
+ hnd = &retu_irq_handlers[id];
+ if (hnd->func == NULL) {
+ printk(KERN_ERR PFX "IRQ %d already freed\n", id);
+ return;
+ }
+
+ retu_disable_irq(id);
+ hnd->func = NULL;
+}
+
+/**
+ * retu_power_off - Shut down power to system
+ *
+ * This function puts the system in power off state
+ */
+static void retu_power_off(void)
+{
+ /* Ignore power button state */
+ retu_write_reg(RETU_REG_CC1, retu_read_reg(RETU_REG_CC1) | 2);
+ /* Expire watchdog immediately */
+ retu_write_reg(RETU_REG_WATCHDOG, 0);
+ /* Wait for poweroff*/
+ for (;;);
+}
+
+/**
+ * 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 device *dev)
+{
+ int rev, ret;
+
+ /* Prepare tasklet */
+ tasklet_init(&retu_tasklet, retu_tasklet_handler, 0);
+
+ /* REVISIT: Pass these from board-*.c files in platform_data */
+ if (machine_is_nokia770()) {
+ retu_irq_pin = 62;
+ } else if (machine_is_nokia_n800() || machine_is_nokia_n810() ||
+ machine_is_nokia_n810_wimax()) {
+ retu_irq_pin = 108;
+ } else {
+ printk(KERN_ERR "cbus: Unsupported board for tahvo\n");
+ return -ENODEV;
+ }
+
+ if ((ret = gpio_request(retu_irq_pin, "RETU irq")) < 0) {
+ printk(KERN_ERR PFX "Unable to reserve IRQ GPIO\n");
+ return ret;
+ }
+
+ /* Set the pin as input */
+ gpio_direction_input(retu_irq_pin);
+
+ /* Rising edge triggers the IRQ */
+ set_irq_type(gpio_to_irq(retu_irq_pin), IRQ_TYPE_EDGE_RISING);
+
+ retu_initialized = 1;
+
+ rev = retu_read_reg(RETU_REG_ASICR) & 0xff;
+ if (rev & (1 << 7))
+ retu_is_vilma = 1;
+
+ printk(KERN_INFO "%s v%d.%d found\n", retu_is_vilma ? "Vilma" : "Retu",
+ (rev >> 4) & 0x07, rev & 0x0f);
+
+ /* Mask all RETU interrupts */
+ retu_write_reg(RETU_REG_IMR, 0xffff);
+
+ ret = request_irq(gpio_to_irq(retu_irq_pin), retu_irq_handler, 0,
+ "retu", 0);
+ if (ret < 0) {
+ printk(KERN_ERR PFX "Unable to register IRQ handler\n");
+ gpio_free(retu_irq_pin);
+ return ret;
+ }
+ set_irq_wake(gpio_to_irq(retu_irq_pin), 1);
+
+ /* Register power off function */
+ pm_power_off = retu_power_off;
+
+#ifdef CONFIG_CBUS_RETU_USER
+ /* Initialize user-space interface */
+ if (retu_user_init() < 0) {
+ printk(KERN_ERR "Unable to initialize driver\n");
+ free_irq(gpio_to_irq(retu_irq_pin), 0);
+ gpio_free(retu_irq_pin);
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+
+static int retu_remove(struct device *dev)
+{
+#ifdef CONFIG_CBUS_RETU_USER
+ retu_user_cleanup();
+#endif
+ /* Mask all RETU interrupts */
+ retu_write_reg(RETU_REG_IMR, 0xffff);
+ free_irq(gpio_to_irq(retu_irq_pin), 0);
+ gpio_free(retu_irq_pin);
+ tasklet_kill(&retu_tasklet);
+
+ return 0;
+}
+
+static void retu_device_release(struct device *dev)
+{
+ complete(&device_release);
+}
+
+static struct device_driver retu_driver = {
+ .name = "retu",
+ .bus = &platform_bus_type,
+ .probe = retu_probe,
+ .remove = retu_remove,
+};
+
+static struct platform_device retu_device = {
+ .name = "retu",
+ .id = -1,
+ .dev = {
+ .release = retu_device_release,
+ }
+};
+
+/**
+ * retu_init - initialise Retu driver
+ *
+ * Initialise the Retu driver and return 0 if everything worked ok
+ */
+static int __init retu_init(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "Retu/Vilma driver initialising\n");
+
+ init_completion(&device_release);
+
+ if ((ret = driver_register(&retu_driver)) < 0)
+ return ret;
+
+ if ((ret = platform_device_register(&retu_device)) < 0) {
+ driver_unregister(&retu_driver);
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Cleanup
+ */
+static void __exit retu_exit(void)
+{
+ platform_device_unregister(&retu_device);
+ driver_unregister(&retu_driver);
+ wait_for_completion(&device_release);
+}
+
+EXPORT_SYMBOL(retu_request_irq);
+EXPORT_SYMBOL(retu_free_irq);
+EXPORT_SYMBOL(retu_enable_irq);
+EXPORT_SYMBOL(retu_disable_irq);
+EXPORT_SYMBOL(retu_ack_irq);
+EXPORT_SYMBOL(retu_read_reg);
+EXPORT_SYMBOL(retu_write_reg);
+
+subsys_initcall(retu_init);
+module_exit(retu_exit);
+
+MODULE_DESCRIPTION("Retu ASIC control");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä, David Weinehall, and Mikko Ylinen");
Index: linux-2.6.37/drivers/cbus/retu.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu.h 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,77 @@
+/**
+ * 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_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
+
+int retu_read_reg(int reg);
+void retu_write_reg(int reg, u16 val);
+void retu_set_clear_reg_bits(int reg, u16 set, u16 clear);
+int retu_read_adc(int channel);
+int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
+void retu_free_irq(int id);
+void retu_enable_irq(int id);
+void retu_disable_irq(int id);
+void retu_ack_irq(int id);
+
+#ifdef CONFIG_CBUS_RETU_USER
+int retu_user_init(void);
+void retu_user_cleanup(void);
+#endif
+
+extern spinlock_t retu_lock;
+
+#endif /* __DRIVERS_CBUS_RETU_H */
Index: linux-2.6.37/drivers/cbus/retu-headset.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu-headset.c 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,356 @@
+/**
+ * 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/delay.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/slab.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 platform_device *pdev;
+ struct input_dev *idev;
+ unsigned bias_enabled;
+ unsigned detection_enabled;
+ unsigned pressed;
+ struct timer_list enable_timer;
+ struct timer_list detect_timer;
+};
+
+static void retu_headset_set_bias(int enable)
+{
+ if (enable) {
+ retu_set_clear_reg_bits(RETU_REG_AUDTXR,
+ (1 << 0) | (1 << 1), 0);
+ msleep(2);
+ retu_set_clear_reg_bits(RETU_REG_AUDTXR, 1 << 3, 0);
+ } else {
+ retu_set_clear_reg_bits(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(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(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(RETU_REG_CC1, (1 << 10) | (1 << 8), 0);
+ retu_enable_irq(RETU_INT_HOOK);
+ }
+ 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;
+ retu_disable_irq(RETU_INT_HOOK);
+ 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(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(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 void retu_headset_hook_interrupt(unsigned long arg)
+{
+ struct retu_headset *hs = (struct retu_headset *) arg;
+ unsigned long flags;
+
+ retu_ack_irq(RETU_INT_HOOK);
+ 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(RETU_REG_CC1, 0, (1 << 10) | (1 << 8));
+ mod_timer(&hs->enable_timer, jiffies + msecs_to_jiffies(50));
+}
+
+static void retu_headset_enable_timer(unsigned long arg)
+{
+ struct retu_headset *hs = (struct retu_headset *) arg;
+
+ retu_set_clear_reg_bits(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 r;
+
+ hs = kzalloc(sizeof(*hs), GFP_KERNEL);
+ if (hs == NULL)
+ return -ENOMEM;
+
+ hs->pdev = pdev;
+
+ 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);
+
+ r = retu_request_irq(RETU_INT_HOOK, retu_headset_hook_interrupt,
+ (unsigned long) hs, "hookdet");
+ if (r != 0) {
+ dev_err(&pdev->dev, "hookdet IRQ not available\n");
+ goto err6;
+ }
+ retu_disable_irq(RETU_INT_HOOK);
+ 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);
+ retu_free_irq(RETU_INT_HOOK);
+ 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(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(1);
+ mutex_unlock(&hs->mutex);
+
+ return 0;
+}
+
+static struct platform_driver retu_headset_driver = {
+ .probe = retu_headset_probe,
+ .remove = retu_headset_remove,
+ .suspend = retu_headset_suspend,
+ .resume = retu_headset_resume,
+ .driver = {
+ .name = "retu-headset",
+ },
+};
+
+static int __init retu_headset_init(void)
+{
+ int r;
+
+ printk(KERN_INFO "Retu/Vilma headset driver initializing\n");
+
+ r = platform_driver_register(&retu_headset_driver);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+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");
Index: linux-2.6.37/drivers/cbus/retu-pwrbutton.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu-pwrbutton.c 2011-01-27 14:17:39.085000008 +0100
@@ -0,0 +1,118 @@
+/**
+ * drivers/cbus/retu-pwrbutton.c
+ *
+ * Driver for sending retu power button event to input-layer
+ *
+ * Copyright (C) 2004 Nokia Corporation
+ *
+ * Written by Ari Saastamoinen <ari.saastamoinen@elektrobit.com>
+ *
+ * Contact Juha Yrjölä <juha.yrjola@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/timer.h>
+#include <linux/jiffies.h>
+#include <linux/bitops.h>
+
+#include "retu.h"
+
+#define RETU_STATUS_PWRONX (1 << 5)
+
+#define PWRBTN_DELAY 20
+#define PWRBTN_UP 0
+#define PWRBTN_PRESSED 1
+
+static int pwrbtn_state;
+static struct input_dev *pwrbtn_dev;
+static struct timer_list pwrbtn_timer;
+
+static void retubutton_timer_func(unsigned long arg)
+{
+ int state;
+
+ if (retu_read_reg(RETU_REG_STATUS) & RETU_STATUS_PWRONX)
+ state = PWRBTN_UP;
+ else
+ state = PWRBTN_PRESSED;
+
+ if (pwrbtn_state != state) {
+ input_report_key(pwrbtn_dev, KEY_POWER, state);
+ pwrbtn_state = state;
+ }
+}
+
+/**
+ * Interrupt function is called whenever power button key is pressed
+ * or released.
+ */
+static void retubutton_irq(unsigned long arg)
+{
+ retu_ack_irq(RETU_INT_PWR);
+ mod_timer(&pwrbtn_timer, jiffies + msecs_to_jiffies(PWRBTN_DELAY));
+}
+
+/**
+ * Init function.
+ * Allocates interrupt for power button and registers itself to input layer.
+ */
+static int __init retubutton_init(void)
+{
+ int irq;
+
+ printk(KERN_INFO "Retu power button driver initialized\n");
+ irq = RETU_INT_PWR;
+
+ init_timer(&pwrbtn_timer);
+ pwrbtn_timer.function = retubutton_timer_func;
+
+ if (retu_request_irq(irq, &retubutton_irq, 0, "PwrOnX") < 0) {
+ printk(KERN_ERR "%s@%s: Cannot allocate irq\n",
+ __FUNCTION__, __FILE__);
+ return -EBUSY;
+ }
+
+ pwrbtn_dev = input_allocate_device();
+ if (!pwrbtn_dev)
+ return -ENOMEM;
+
+ pwrbtn_dev->evbit[0] = BIT_MASK(EV_KEY);
+ pwrbtn_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
+ pwrbtn_dev->name = "retu-pwrbutton";
+
+ return input_register_device(pwrbtn_dev);
+}
+
+/**
+ * Cleanup function which is called when driver is unloaded
+ */
+static void __exit retubutton_exit(void)
+{
+ retu_free_irq(RETU_INT_PWR);
+ del_timer_sync(&pwrbtn_timer);
+ input_unregister_device(pwrbtn_dev);
+}
+
+module_init(retubutton_init);
+module_exit(retubutton_exit);
+
+MODULE_DESCRIPTION("Retu Power Button");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ari Saastamoinen");
Index: linux-2.6.37/drivers/cbus/retu-rtc.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu-rtc.c 2011-01-27 14:17:39.086000008 +0100
@@ -0,0 +1,477 @@
+/**
+ * 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/module.h>
+#include <linux/completion.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+static struct mutex retu_rtc_mutex;
+static u16 retu_rtc_alarm_expired;
+static u16 retu_rtc_reset_occurred;
+
+static DECLARE_COMPLETION(retu_rtc_exited);
+static DECLARE_COMPLETION(retu_rtc_sync);
+
+static void retu_rtc_barrier(void);
+
+static void retu_rtc_device_release(struct device *dev)
+{
+ complete(&retu_rtc_exited);
+}
+
+static ssize_t retu_rtc_time_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u16 dsr, hmr, dsr2;
+
+ mutex_lock(&retu_rtc_mutex);
+
+ do {
+ u16 dummy;
+
+ /*
+ * Not being in_interrupt() for a retu rtc IRQ, we need to
+ * read twice for consistency..
+ */
+ dummy = retu_read_reg(RETU_REG_RTCDSR);
+ dsr = retu_read_reg(RETU_REG_RTCDSR);
+
+ dummy = retu_read_reg(RETU_REG_RTCHMR);
+ hmr = retu_read_reg(RETU_REG_RTCHMR);
+
+ dummy = retu_read_reg(RETU_REG_RTCDSR);
+ dsr2 = retu_read_reg(RETU_REG_RTCDSR);
+ } while ((dsr != dsr2));
+
+ mutex_unlock(&retu_rtc_mutex);
+
+ /*
+ * Format a 32-bit date-string for userspace
+ *
+ * days | hours | minutes | seconds
+ *
+ * 8 bits for each.
+ *
+ * This mostly sucks because days and seconds are tracked in RTCDSR
+ * while hours and minutes are tracked in RTCHMR. And yes, there
+ * really are no words that can describe an 8 bit day register (or
+ * rather, none that will be reprinted here).
+ */
+ return sprintf(buf, "0x%08x\n", (((dsr >> 8) & 0xff) << 24) |
+ (((hmr >> 8) & 0x1f) << 16) |
+ ((hmr & 0x3f) << 8) | (dsr & 0x3f));
+}
+
+static ssize_t retu_rtc_time_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ mutex_lock(&retu_rtc_mutex);
+ /*
+ * Writing anything to the day counter forces it to 0
+ * The seconds counter would be cleared by resetting the minutes counter,
+ * however this won't happen, since we are using the hh:mm counters as
+ * a set of free running counters and the day counter as a multiple
+ * overflow holder.
+ */
+
+ /* Reset day counter, but keep Temperature Shutdown state */
+ retu_write_reg(RETU_REG_RTCDSR,
+ retu_read_reg(RETU_REG_RTCDSR) & (1 << 6));
+
+ mutex_unlock(&retu_rtc_mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(time, S_IRUGO | S_IWUSR, retu_rtc_time_show,
+ retu_rtc_time_store);
+
+
+static ssize_t retu_rtc_reset_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ /*
+ * Returns the status of the rtc
+ *
+ * 0: no reset has occurred or the status has been cleared
+ * 1: a reset has occurred
+ *
+ * RTC needs to be reset only when both main battery
+ * _AND_ backup battery are discharged
+ */
+ return sprintf(buf, "%u\n", retu_rtc_reset_occurred);
+}
+
+static void retu_rtc_do_reset(void)
+{
+ u16 ccr1;
+
+ ccr1 = retu_read_reg(RETU_REG_CC1);
+ /* RTC in reset */
+ retu_write_reg(RETU_REG_CC1, ccr1 | 0x0001);
+ /* RTC in normal operating mode */
+ retu_write_reg(RETU_REG_CC1, ccr1 & ~0x0001);
+
+ retu_rtc_barrier();
+ /* Disable alarm and RTC WD */
+ retu_write_reg(RETU_REG_RTCHMAR, 0x7f3f);
+ /* Set Calibration register to default value */
+ retu_write_reg(RETU_REG_RTCCALR, 0x00c0);
+
+ retu_rtc_alarm_expired = 0;
+ retu_rtc_reset_occurred = 1;
+}
+
+static ssize_t retu_rtc_reset_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned choice;
+
+ if(sscanf(buf, "%u", &choice) != 1)
+ return count;
+ mutex_lock(&retu_rtc_mutex);
+ if (choice == 0)
+ retu_rtc_reset_occurred = 0;
+ else if (choice == 1)
+ retu_rtc_do_reset();
+ mutex_unlock(&retu_rtc_mutex);
+ return count;
+}
+
+static DEVICE_ATTR(reset, S_IRUGO | S_IWUSR, retu_rtc_reset_show,
+ retu_rtc_reset_store);
+
+static ssize_t retu_rtc_alarm_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u16 chmar;
+ ssize_t retval;
+
+ mutex_lock(&retu_rtc_mutex);
+ /*
+ * Format a 16-bit date-string for userspace
+ *
+ * hours | minutes
+ * 8 bits for each.
+ */
+ chmar = retu_read_reg(RETU_REG_RTCHMAR);
+ /* No shifting needed, only masking unrelated bits */
+ retval = sprintf(buf, "0x%04x\n", chmar & 0x1f3f);
+ mutex_unlock(&retu_rtc_mutex);
+
+ return retval;
+}
+
+static ssize_t retu_rtc_alarm_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 chmar;
+ unsigned alrm;
+ unsigned hours;
+ unsigned minutes;
+
+ mutex_lock(&retu_rtc_mutex);
+
+ if(sscanf(buf, "%x", &alrm) != 1)
+ return count;
+ hours = (alrm >> 8) & 0x001f;
+ minutes = (alrm >> 0) & 0x003f;
+ if ((hours < 24 && minutes < 60) || (hours == 24 && minutes == 60)) {
+ /*
+ * OK, the time format for the alarm is valid (including the
+ * disabling values)
+ */
+ /* Keeps the RTC watchdog status */
+ chmar = retu_read_reg(RETU_REG_RTCHMAR) & 0x6000;
+ chmar |= alrm & 0x1f3f; /* Stores the requested alarm */
+ retu_rtc_barrier();
+ retu_write_reg(RETU_REG_RTCHMAR, chmar);
+ /* If the alarm is being disabled */
+ if (hours == 24 && minutes == 60) {
+ /* disable the interrupt */
+ retu_disable_irq(RETU_INT_RTCA);
+ retu_rtc_alarm_expired = 0;
+ } else
+ /* enable the interrupt */
+ retu_enable_irq(RETU_INT_RTCA);
+ }
+ mutex_unlock(&retu_rtc_mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(alarm, S_IRUGO | S_IWUSR, retu_rtc_alarm_show,
+ retu_rtc_alarm_store);
+
+static ssize_t retu_rtc_alarm_expired_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ ssize_t retval;
+
+ retval = sprintf(buf, "%u\n", retu_rtc_alarm_expired);
+
+ return retval;
+}
+
+static ssize_t retu_rtc_alarm_expired_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ retu_rtc_alarm_expired = 0;
+
+ return count;
+}
+
+static DEVICE_ATTR(alarm_expired, S_IRUGO | S_IWUSR, retu_rtc_alarm_expired_show,
+ retu_rtc_alarm_expired_store);
+
+
+static ssize_t retu_rtc_cal_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u16 rtccalr1;
+
+ mutex_lock(&retu_rtc_mutex);
+ rtccalr1 = retu_read_reg(RETU_REG_RTCCALR);
+ mutex_unlock(&retu_rtc_mutex);
+
+ /*
+ * Shows the status of the Calibration Register.
+ *
+ * Default, after power loss: 0x0000
+ * Default, for R&D: 0x00C0
+ * Default, for factory: 0x00??
+ *
+ */
+ return sprintf(buf, "0x%04x\n", rtccalr1 & 0x00ff);
+}
+
+static ssize_t retu_rtc_cal_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned calibration_value;
+
+ if (sscanf(buf, "%x", &calibration_value) != 1)
+ return count;
+
+ mutex_lock(&retu_rtc_mutex);
+ retu_rtc_barrier();
+ retu_write_reg(RETU_REG_RTCCALR, calibration_value & 0x00ff);
+ mutex_unlock(&retu_rtc_mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(cal, S_IRUGO | S_IWUSR, retu_rtc_cal_show,
+ retu_rtc_cal_store);
+
+static struct platform_device retu_rtc_device;
+
+static void retu_rtca_disable(void)
+{
+ retu_disable_irq(RETU_INT_RTCA);
+ retu_rtc_alarm_expired = 1;
+ retu_rtc_barrier();
+ retu_write_reg(RETU_REG_RTCHMAR, (24 << 8) | 60);
+}
+
+static void retu_rtca_expired(struct work_struct *unused)
+{
+ retu_rtca_disable();
+ sysfs_notify(&retu_rtc_device.dev.kobj, NULL, "alarm_expired");
+}
+
+DECLARE_WORK(retu_rtca_work, retu_rtca_expired);
+
+/*
+ * RTCHMR RTCHMAR RTCCAL must be accessed within 0.9 s since the seconds
+ * interrupt has been signaled in the IDR register
+ */
+static void retu_rtcs_interrupt(unsigned long unused)
+{
+ retu_ack_irq(RETU_INT_RTCS);
+ complete_all(&retu_rtc_sync);
+}
+
+static void retu_rtca_interrupt(unsigned long unused)
+{
+ retu_ack_irq(RETU_INT_RTCA);
+ schedule_work(&retu_rtca_work);
+}
+
+static int retu_rtc_init_irq(void)
+{
+ int ret;
+
+ ret = retu_request_irq(RETU_INT_RTCS, retu_rtcs_interrupt, 0, "RTCS");
+ if (ret != 0)
+ return ret;
+ /*
+ * We will take care of enabling and disabling the interrupt
+ * elsewhere, so leave it off by default..
+ */
+ retu_disable_irq(RETU_INT_RTCS);
+
+ ret = retu_request_irq(RETU_INT_RTCA, retu_rtca_interrupt, 0, "RTCA");
+ if (ret != 0) {
+ retu_free_irq(RETU_INT_RTCS);
+ return ret;
+ }
+ retu_disable_irq(RETU_INT_RTCA);
+
+ return 0;
+}
+
+
+static int __devinit retu_rtc_probe(struct device *dev)
+{
+ int r;
+
+ retu_rtc_alarm_expired = retu_read_reg(RETU_REG_IDR) &
+ (0x1 << RETU_INT_RTCA);
+
+ if ((r = retu_rtc_init_irq()) != 0)
+ return r;
+
+ mutex_init(&retu_rtc_mutex);
+
+ /* If the calibration register is zero, we've probably lost
+ * power */
+ if (retu_read_reg(RETU_REG_RTCCALR) & 0x00ff)
+ retu_rtc_reset_occurred = 0;
+ else
+ retu_rtc_do_reset();
+
+ if ((r = device_create_file(dev, &dev_attr_time)) != 0)
+ return r;
+ else if ((r = device_create_file(dev, &dev_attr_reset)) != 0)
+ goto err_unregister_time;
+ else if ((r = device_create_file(dev, &dev_attr_alarm)) != 0)
+ goto err_unregister_reset;
+ else if ((r = device_create_file(dev, &dev_attr_alarm_expired)) != 0)
+ goto err_unregister_alarm;
+ else if ((r = device_create_file(dev, &dev_attr_cal)) != 0)
+ goto err_unregister_alarm_expired;
+ else
+ return r;
+
+err_unregister_alarm_expired:
+ device_remove_file(dev, &dev_attr_alarm_expired);
+err_unregister_alarm:
+ device_remove_file(dev, &dev_attr_alarm);
+err_unregister_reset:
+ device_remove_file(dev, &dev_attr_reset);
+err_unregister_time:
+ device_remove_file(dev, &dev_attr_time);
+ return r;
+}
+
+static int __devexit retu_rtc_remove(struct device *dev)
+{
+ retu_disable_irq(RETU_INT_RTCS);
+ retu_free_irq(RETU_INT_RTCS);
+ retu_free_irq(RETU_INT_RTCA);
+ device_remove_file(dev, &dev_attr_cal);
+ device_remove_file(dev, &dev_attr_alarm_expired);
+ device_remove_file(dev, &dev_attr_alarm);
+ device_remove_file(dev, &dev_attr_reset);
+ device_remove_file(dev, &dev_attr_time);
+ return 0;
+}
+
+static struct device_driver retu_rtc_driver = {
+ .name = "retu-rtc",
+ .bus = &platform_bus_type,
+ .probe = retu_rtc_probe,
+ .remove = __devexit_p(retu_rtc_remove),
+};
+
+static struct platform_device retu_rtc_device = {
+ .name = "retu-rtc",
+ .id = -1,
+ .dev = {
+ .release = retu_rtc_device_release,
+ },
+};
+
+/* This function provides syncronization with the RTCS interrupt handler */
+static void retu_rtc_barrier(void)
+{
+ INIT_COMPLETION(retu_rtc_sync);
+ retu_ack_irq(RETU_INT_RTCS);
+ retu_enable_irq(RETU_INT_RTCS);
+ wait_for_completion(&retu_rtc_sync);
+ retu_disable_irq(RETU_INT_RTCS);
+}
+
+static int __init retu_rtc_init(void)
+{
+ int ret;
+
+ init_completion(&retu_rtc_exited);
+
+ if ((ret = driver_register(&retu_rtc_driver)) != 0)
+ return ret;
+
+ if ((ret = platform_device_register(&retu_rtc_device)) != 0)
+ goto err_unregister_driver;
+
+ return 0;
+
+err_unregister_driver:
+ driver_unregister(&retu_rtc_driver);
+ return ret;
+}
+
+static void __exit retu_rtc_exit(void)
+{
+ platform_device_unregister(&retu_rtc_device);
+ driver_unregister(&retu_rtc_driver);
+
+ wait_for_completion(&retu_rtc_exited);
+}
+
+module_init(retu_rtc_init);
+module_exit(retu_rtc_exit);
+
+MODULE_DESCRIPTION("Retu RTC");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Paul Mundt and Igor Stoppa");
Index: linux-2.6.37/drivers/cbus/retu-user.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu-user.c 2011-01-27 14:17:39.086000008 +0100
@@ -0,0 +1,424 @@
+/**
+ * drivers/cbus/retu-user.c
+ *
+ * Retu user space interface functions
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by 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/types.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+
+#include "retu.h"
+
+#include "user_retu_tahvo.h"
+
+/* Maximum size of IRQ node buffer/pool */
+#define RETU_MAX_IRQ_BUF_LEN 16
+
+#define PFX "retu-user: "
+
+/* Bitmap for marking the interrupt sources as having the handlers */
+static u32 retu_irq_bits;
+
+/* For allowing only one user process to subscribe to the retu interrupts */
+static struct file *retu_irq_subscr = NULL;
+
+/* For poll and IRQ passing */
+struct retu_irq {
+ u32 id;
+ struct list_head node;
+};
+
+static spinlock_t retu_irqs_lock;
+static struct retu_irq *retu_irq_block;
+static LIST_HEAD(retu_irqs);
+static LIST_HEAD(retu_irqs_reserve);
+
+/* Wait queue - used when user wants to read the device */
+DECLARE_WAIT_QUEUE_HEAD(retu_user_waitqueue);
+
+/* Semaphore to protect irq subscription sequence */
+static struct mutex retu_mutex;
+
+/* This array specifies RETU register types (read/write/toggle) */
+static const u8 retu_access_bits[] = {
+ 1,
+ 4,
+ 3,
+ 3,
+ 1,
+ 3,
+ 3,
+ 0,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 4,
+ 4,
+ 3,
+ 0,
+ 0,
+ 0,
+ 0,
+ 1,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3
+};
+
+/*
+ * The handler for all RETU interrupts.
+ *
+ * arg is the interrupt source in RETU.
+ */
+static void retu_user_irq_handler(unsigned long arg)
+{
+ struct retu_irq *irq;
+
+ retu_ack_irq(arg);
+
+ spin_lock(&retu_irqs_lock);
+ if (list_empty(&retu_irqs_reserve)) {
+ spin_unlock(&retu_irqs_lock);
+ return;
+ }
+ irq = list_entry((&retu_irqs_reserve)->next, struct retu_irq, node);
+ irq->id = arg;
+ list_move_tail(&irq->node, &retu_irqs);
+ spin_unlock(&retu_irqs_lock);
+
+ /* wake up waiting thread */
+ wake_up(&retu_user_waitqueue);
+}
+
+/*
+ * This routine sets up the interrupt handler and marks an interrupt source
+ * in RETU as a candidate for signal delivery to the user process.
+ */
+static int retu_user_subscribe_to_irq(int id, struct file *filp)
+{
+ int ret;
+
+ mutex_lock(&retu_mutex);
+ if ((retu_irq_subscr != NULL) && (retu_irq_subscr != filp)) {
+ mutex_unlock(&retu_mutex);
+ return -EBUSY;
+ }
+ /* Store the file pointer of the first user process registering IRQs */
+ retu_irq_subscr = filp;
+ mutex_unlock(&retu_mutex);
+
+ if (retu_irq_bits & (1 << id))
+ return 0;
+
+ ret = retu_request_irq(id, retu_user_irq_handler, id, "");
+ if (ret < 0)
+ return ret;
+
+ /* Mark that this interrupt has a handler */
+ retu_irq_bits |= 1 << id;
+
+ return 0;
+}
+
+/*
+ * Unregisters all RETU interrupt handlers.
+ */
+static void retu_unreg_irq_handlers(void)
+{
+ int id;
+
+ if (!retu_irq_bits)
+ return;
+
+ for (id = 0; id < MAX_RETU_IRQ_HANDLERS; id++)
+ if (retu_irq_bits & (1 << id))
+ retu_free_irq(id);
+
+ retu_irq_bits = 0;
+}
+
+/*
+ * Write to RETU register.
+ * Returns 0 upon success, a negative error value otherwise.
+ */
+static int retu_user_write_with_mask(u32 field, u16 value)
+{
+ u32 mask;
+ u32 reg;
+ u_short tmp;
+ unsigned long flags;
+
+ mask = MASK(field);
+ reg = REG(field);
+
+ /* Detect bad mask and reg */
+ if (mask == 0 || reg > RETU_REG_MAX ||
+ retu_access_bits[reg] == READ_ONLY) {
+ printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
+ reg, mask);
+ return -EINVAL;
+ }
+
+ /* Justify value according to mask */
+ while (!(mask & 1)) {
+ value = value << 1;
+ mask = mask >> 1;
+ }
+
+ spin_lock_irqsave(&retu_lock, flags);
+ if (retu_access_bits[reg] == TOGGLE) {
+ /* No need to detect previous content of register */
+ tmp = 0;
+ } else {
+ /* Read current value of register */
+ tmp = retu_read_reg(reg);
+ }
+
+ /* Generate new value */
+ tmp = (tmp & ~MASK(field)) | (value & MASK(field));
+ /* Write data to RETU */
+ retu_write_reg(reg, tmp);
+ spin_unlock_irqrestore(&retu_lock, flags);
+
+ return 0;
+}
+
+/*
+ * Read RETU register.
+ */
+static u32 retu_user_read_with_mask(u32 field)
+{
+ u_short value;
+ u32 mask, reg;
+
+ mask = MASK(field);
+ reg = REG(field);
+
+ /* Detect bad mask and reg */
+ if (mask == 0 || reg > RETU_REG_MAX) {
+ printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
+ reg, mask);
+ return -EINVAL;
+ }
+
+ /* Read the register */
+ value = retu_read_reg(reg) & mask;
+
+ /* Right justify value */
+ while (!(mask & 1)) {
+ value = value >> 1;
+ mask = mask >> 1;
+ }
+
+ return value;
+}
+
+/*
+ * Close device
+ */
+static int retu_close(struct inode *inode, struct file *filp)
+{
+ /* Unregister all interrupts that have been registered */
+ if (retu_irq_subscr == filp) {
+ retu_unreg_irq_handlers();
+ retu_irq_subscr = NULL;
+ }
+
+ return 0;
+}
+
+/*
+ * Device control (ioctl)
+ */
+static long retu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct retu_tahvo_write_parms par;
+ int ret;
+
+ switch (cmd) {
+ case URT_IOCT_IRQ_SUBSCR:
+ return retu_user_subscribe_to_irq(arg, filp);
+ case RETU_IOCH_READ:
+ return retu_user_read_with_mask(arg);
+ case RETU_IOCX_WRITE:
+ ret = copy_from_user(&par, (void __user *) arg, sizeof(par));
+ if (ret)
+ printk(KERN_ERR "copy_from_user failed: %d\n", ret);
+ par.result = retu_user_write_with_mask(par.field, par.value);
+ ret = copy_to_user((void __user *) arg, &par, sizeof(par));
+ if (ret)
+ printk(KERN_ERR "copy_to_user failed: %d\n", ret);
+ break;
+ case RETU_IOCH_ADC_READ:
+ return retu_read_adc(arg);
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+/*
+ * Read from device
+ */
+static ssize_t retu_read(struct file *filp, char *buf, size_t count,
+ loff_t * offp)
+{
+ struct retu_irq *irq;
+
+ u32 nr, i;
+
+ /* read not permitted if neither filp nor anyone has registered IRQs */
+ if (retu_irq_subscr != filp)
+ return -EPERM;
+
+ if ((count < sizeof(u32)) || ((count % sizeof(u32)) != 0))
+ return -EINVAL;
+
+ nr = count / sizeof(u32);
+
+ for (i = 0; i < nr; i++) {
+ unsigned long flags;
+ u32 irq_id;
+ int ret;
+
+ ret = wait_event_interruptible(retu_user_waitqueue,
+ !list_empty(&retu_irqs));
+ if (ret < 0)
+ return ret;
+
+ spin_lock_irqsave(&retu_irqs_lock, flags);
+ irq = list_entry((&retu_irqs)->next, struct retu_irq, node);
+ irq_id = irq->id;
+ list_move(&irq->node, &retu_irqs_reserve);
+ spin_unlock_irqrestore(&retu_irqs_lock, flags);
+
+ ret = copy_to_user(buf + i * sizeof(irq_id), &irq_id,
+ sizeof(irq_id));
+ if (ret)
+ printk(KERN_ERR "copy_to_user failed: %d\n", ret);
+ }
+
+ return count;
+}
+
+/*
+ * Poll method
+ */
+static unsigned retu_poll(struct file *filp, struct poll_table_struct *pt)
+{
+ if (!list_empty(&retu_irqs))
+ return POLLIN;
+
+ poll_wait(filp, &retu_user_waitqueue, pt);
+
+ if (!list_empty(&retu_irqs))
+ return POLLIN;
+ else
+ return 0;
+}
+
+static struct file_operations retu_user_fileops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = retu_ioctl,
+ .read = retu_read,
+ .release = retu_close,
+ .poll = retu_poll
+};
+
+static struct miscdevice retu_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "retu",
+ .fops = &retu_user_fileops
+};
+
+/*
+ * Initialization
+ *
+ * @return 0 if successful, error value otherwise.
+ */
+int retu_user_init(void)
+{
+ struct retu_irq *irq;
+ int res, i;
+
+ irq = kmalloc(sizeof(*irq) * RETU_MAX_IRQ_BUF_LEN, GFP_KERNEL);
+ if (irq == NULL) {
+ printk(KERN_ERR PFX "kmalloc failed\n");
+ return -ENOMEM;
+ }
+ memset(irq, 0, sizeof(*irq) * RETU_MAX_IRQ_BUF_LEN);
+ for (i = 0; i < RETU_MAX_IRQ_BUF_LEN; i++)
+ list_add(&irq[i].node, &retu_irqs_reserve);
+
+ retu_irq_block = irq;
+
+ spin_lock_init(&retu_irqs_lock);
+ mutex_init(&retu_mutex);
+
+ /* Request a misc device */
+ res = misc_register(&retu_device);
+ if (res < 0) {
+ printk(KERN_ERR PFX "unable to register misc device for %s\n",
+ retu_device.name);
+ kfree(irq);
+ return res;
+ }
+
+ return 0;
+}
+
+/*
+ * Cleanup.
+ */
+void retu_user_cleanup(void)
+{
+ /* Unregister our misc device */
+ misc_deregister(&retu_device);
+ /* Unregister and disable all RETU interrupts used by this module */
+ retu_unreg_irq_handlers();
+ kfree(retu_irq_block);
+}
+
+MODULE_DESCRIPTION("Retu ASIC user space functions");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mikko Ylinen");
Index: linux-2.6.37/drivers/cbus/retu-wdt.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/retu-wdt.c 2011-01-27 14:17:39.086000008 +0100
@@ -0,0 +1,387 @@
+/**
+ * drivers/cbus/retu-wdt.c
+ *
+ * Driver for Retu watchdog
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Amit Kucheria <amit.kucheria@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/device.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/completion.h>
+#include <linux/errno.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.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
+
+static struct completion retu_wdt_completion;
+static DEFINE_MUTEX(retu_wdt_mutex);
+
+/* Current period of watchdog */
+static unsigned int period_val = RETU_WDT_DEFAULT_TIMER;
+static int counter_param = RETU_WDT_MAX_TIMER;
+
+struct retu_wdt_dev {
+ struct device *dev;
+ int users;
+ struct miscdevice retu_wdt_miscdev;
+ struct timer_list ping_timer;
+};
+
+static struct retu_wdt_dev *retu_wdt;
+
+static void retu_wdt_set_ping_timer(unsigned long enable);
+
+static int _retu_modify_counter(unsigned int new)
+{
+ retu_write_reg(RETU_REG_WATCHDOG, (u16)new);
+
+ return 0;
+}
+
+static int retu_modify_counter(unsigned int new)
+{
+ if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER)
+ return -EINVAL;
+
+ mutex_lock(&retu_wdt_mutex);
+ period_val = new;
+ _retu_modify_counter(period_val);
+ mutex_unlock(&retu_wdt_mutex);
+
+ return 0;
+}
+
+static ssize_t retu_wdt_period_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ /* Show current max counter */
+ return sprintf(buf, "%u\n", (u16)period_val);
+}
+
+/*
+ * Note: This inteface is non-standard and likely to disappear!
+ * Use /dev/watchdog instead, that's the standard.
+ */
+static ssize_t retu_wdt_period_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned int new_period;
+ int ret;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ retu_wdt_set_ping_timer(0);
+#endif
+
+ if (sscanf(buf, "%u", &new_period) != 1) {
+ printk(KERN_ALERT "retu_wdt_period_store: Invalid input\n");
+ return -EINVAL;
+ }
+
+ ret = retu_modify_counter(new_period);
+ if (ret < 0)
+ return ret;
+
+ return strnlen(buf, count);
+}
+
+static ssize_t retu_wdt_counter_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u16 counter;
+
+ /* Show current value in watchdog counter */
+ counter = retu_read_reg(RETU_REG_WATCHDOG);
+
+ /* Only the 5 LSB are important */
+ return snprintf(buf, PAGE_SIZE, "%u\n", (counter & 0x3F));
+}
+
+static DEVICE_ATTR(period, S_IRUGO | S_IWUSR, retu_wdt_period_show, \
+ retu_wdt_period_store);
+static DEVICE_ATTR(counter, S_IRUGO, retu_wdt_counter_show, NULL);
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * 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_set_ping_timer(unsigned long enable)
+{
+ _retu_modify_counter(RETU_WDT_MAX_TIMER);
+ if (enable)
+ mod_timer(&retu_wdt->ping_timer,
+ jiffies + RETU_WDT_DEFAULT_TIMER * HZ);
+ else
+ del_timer_sync(&retu_wdt->ping_timer);
+}
+
+static int retu_wdt_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(1, (unsigned long *)&(retu_wdt->users)))
+ return -EBUSY;
+
+ file->private_data = (void *)retu_wdt;
+ retu_wdt_set_ping_timer(0);
+
+ return nonseekable_open(inode, file);
+}
+
+static int retu_wdt_release(struct inode *inode, struct file *file)
+{
+ struct retu_wdt_dev *wdev = file->private_data;
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ retu_wdt_set_ping_timer(1);
+#endif
+ wdev->users = 0;
+
+ return 0;
+}
+
+static ssize_t retu_wdt_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
+{
+ if (len)
+ retu_modify_counter(RETU_WDT_MAX_TIMER);
+
+ return len;
+}
+
+static long retu_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int new_margin;
+
+ static 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(RETU_WDT_MAX_TIMER);
+ break;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, (int __user *)arg))
+ return -EFAULT;
+ retu_modify_counter(new_margin);
+ /* Fall through */
+ case WDIOC_GETTIMEOUT:
+ return put_user(period_val, (int __user *)arg);
+ }
+
+ return 0;
+}
+
+/* Start kicking retu watchdog until user space starts doing the kicking */
+static int __init retu_wdt_ping(void)
+{
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ retu_modify_counter(RETU_WDT_MAX_TIMER);
+#else
+ retu_wdt_set_ping_timer(1);
+#endif
+
+ return 0;
+}
+late_initcall(retu_wdt_ping);
+
+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 __devinit retu_wdt_probe(struct device *dev)
+{
+ struct retu_wdt_dev *wdev;
+ int ret;
+
+ wdev = kzalloc(sizeof(struct retu_wdt_dev), GFP_KERNEL);
+ if (!wdev)
+ return -ENOMEM;
+
+ wdev->users = 0;
+
+ ret = device_create_file(dev, &dev_attr_period);
+ if (ret) {
+ printk(KERN_ERR "retu_wdt_probe: Error creating "
+ "sys device file: period\n");
+ goto free1;
+ }
+
+ ret = device_create_file(dev, &dev_attr_counter);
+ if (ret) {
+ printk(KERN_ERR "retu_wdt_probe: Error creating "
+ "sys device file: counter\n");
+ goto free2;
+ }
+
+ dev_set_drvdata(dev, wdev);
+ retu_wdt = wdev;
+ wdev->retu_wdt_miscdev.parent = dev;
+ wdev->retu_wdt_miscdev.minor = WATCHDOG_MINOR;
+ wdev->retu_wdt_miscdev.name = "watchdog";
+ wdev->retu_wdt_miscdev.fops = &retu_wdt_fops;
+
+ ret = misc_register(&(wdev->retu_wdt_miscdev));
+ if (ret)
+ goto free3;
+
+ setup_timer(&wdev->ping_timer, retu_wdt_set_ping_timer, 1);
+
+ /* Kick the watchdog for kernel booting to finish */
+ retu_modify_counter(RETU_WDT_MAX_TIMER);
+
+ return 0;
+
+free3:
+ device_remove_file(dev, &dev_attr_counter);
+
+free2:
+ device_remove_file(dev, &dev_attr_period);
+free1:
+ kfree(wdev);
+
+ return ret;
+}
+
+static int __devexit retu_wdt_remove(struct device *dev)
+{
+ struct retu_wdt_dev *wdev;
+
+ wdev = dev_get_drvdata(dev);
+ misc_deregister(&(wdev->retu_wdt_miscdev));
+ device_remove_file(dev, &dev_attr_period);
+ device_remove_file(dev, &dev_attr_counter);
+ kfree(wdev);
+
+ return 0;
+}
+
+static void retu_wdt_device_release(struct device *dev)
+{
+ complete(&retu_wdt_completion);
+}
+
+static struct platform_device retu_wdt_device = {
+ .name = "retu-watchdog",
+ .id = -1,
+ .dev = {
+ .release = retu_wdt_device_release,
+ },
+};
+
+static struct device_driver retu_wdt_driver = {
+ .name = "retu-watchdog",
+ .bus = &platform_bus_type,
+ .probe = retu_wdt_probe,
+ .remove = __devexit_p(retu_wdt_remove),
+};
+
+static int __init retu_wdt_init(void)
+{
+ int ret;
+
+ init_completion(&retu_wdt_completion);
+
+ ret = driver_register(&retu_wdt_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_device_register(&retu_wdt_device);
+ if (ret)
+ goto exit1;
+
+ /* passed as module parameter? */
+ ret = retu_modify_counter(counter_param);
+ if (ret == -EINVAL) {
+ ret = retu_modify_counter(RETU_WDT_DEFAULT_TIMER);
+ printk(KERN_INFO
+ "retu_wdt_init: Intializing to default value\n");
+ }
+
+ printk(KERN_INFO "Retu watchdog driver initialized\n");
+ return ret;
+
+exit1:
+ driver_unregister(&retu_wdt_driver);
+ wait_for_completion(&retu_wdt_completion);
+
+ return ret;
+}
+
+static void __exit retu_wdt_exit(void)
+{
+ platform_device_unregister(&retu_wdt_device);
+ driver_unregister(&retu_wdt_driver);
+
+ wait_for_completion(&retu_wdt_completion);
+}
+
+module_init(retu_wdt_init);
+module_exit(retu_wdt_exit);
+module_param(counter_param, int, 0);
+
+MODULE_DESCRIPTION("Retu WatchDog");
+MODULE_AUTHOR("Amit Kucheria");
+MODULE_LICENSE("GPL");
+
Index: linux-2.6.37/drivers/cbus/tahvo.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/tahvo.c 2011-01-27 14:17:39.086000008 +0100
@@ -0,0 +1,443 @@
+/**
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <asm/uaccess.h>
+#include <asm/mach-types.h>
+
+#include <plat/mux.h>
+#include <plat/board.h>
+
+#include "cbus.h"
+#include "tahvo.h"
+
+#define TAHVO_ID 0x02
+#define PFX "tahvo: "
+
+static int tahvo_initialized;
+static int tahvo_irq_pin;
+static int tahvo_is_betty;
+
+static struct tasklet_struct tahvo_tasklet;
+spinlock_t tahvo_lock = SPIN_LOCK_UNLOCKED;
+
+static struct completion device_release;
+
+struct tahvo_irq_handler_desc {
+ int (*func)(unsigned long);
+ unsigned long arg;
+ char name[8];
+};
+
+static struct tahvo_irq_handler_desc tahvo_irq_handlers[MAX_TAHVO_IRQ_HANDLERS];
+
+/**
+ * tahvo_read_reg - Read a value from a register in Tahvo
+ * @reg: the register to read from
+ *
+ * This function returns the contents of the specified register
+ */
+int tahvo_read_reg(int reg)
+{
+ BUG_ON(!tahvo_initialized);
+ return cbus_read_reg(cbus_host, TAHVO_ID, reg);
+}
+
+/**
+ * tahvo_write_reg - Write a value to a register in Tahvo
+ * @reg: the register to write to
+ * @reg: the value to write to the register
+ *
+ * This function writes a value to the specified register
+ */
+void tahvo_write_reg(int reg, u16 val)
+{
+ BUG_ON(!tahvo_initialized);
+ cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
+}
+
+/**
+ * tahvo_set_clear_reg_bits - set and clear register bits atomically
+ * @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(int reg, u16 set, u16 clear)
+{
+ unsigned long flags;
+ u16 w;
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ w = tahvo_read_reg(reg);
+ w &= ~clear;
+ w |= set;
+ tahvo_write_reg(reg, w);
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+}
+
+/*
+ * Disable given TAHVO interrupt
+ */
+void tahvo_disable_irq(int id)
+{
+ unsigned long flags;
+ u16 mask;
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ mask = tahvo_read_reg(TAHVO_REG_IMR);
+ mask |= 1 << id;
+ tahvo_write_reg(TAHVO_REG_IMR, mask);
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+}
+
+/*
+ * Enable given TAHVO interrupt
+ */
+void tahvo_enable_irq(int id)
+{
+ unsigned long flags;
+ u16 mask;
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ mask = tahvo_read_reg(TAHVO_REG_IMR);
+ mask &= ~(1 << id);
+ tahvo_write_reg(TAHVO_REG_IMR, mask);
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+}
+
+/*
+ * Acknowledge given TAHVO interrupt
+ */
+void tahvo_ack_irq(int id)
+{
+ tahvo_write_reg(TAHVO_REG_IDR, 1 << id);
+}
+
+static int tahvo_7bit_backlight;
+
+int tahvo_get_backlight_level(void)
+{
+ int mask;
+
+ if (tahvo_7bit_backlight)
+ mask = 0x7f;
+ else
+ mask = 0x0f;
+ return tahvo_read_reg(TAHVO_REG_LEDPWMR) & mask;
+}
+
+int tahvo_get_max_backlight_level(void)
+{
+ if (tahvo_7bit_backlight)
+ return 0x7f;
+ else
+ return 0x0f;
+}
+
+void tahvo_set_backlight_level(int level)
+{
+ int max_level;
+
+ max_level = tahvo_get_max_backlight_level();
+ if (level > max_level)
+ level = max_level;
+ tahvo_write_reg(TAHVO_REG_LEDPWMR, level);
+}
+
+/*
+ * TAHVO interrupt handler. Only schedules the tasklet.
+ */
+static irqreturn_t tahvo_irq_handler(int irq, void *dev_id)
+{
+ tasklet_schedule(&tahvo_tasklet);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Tasklet handler
+ */
+static void tahvo_tasklet_handler(unsigned long data)
+{
+ struct tahvo_irq_handler_desc *hnd;
+ u16 id;
+ u16 im;
+ int i;
+
+ for (;;) {
+ id = tahvo_read_reg(TAHVO_REG_IDR);
+ im = ~tahvo_read_reg(TAHVO_REG_IMR);
+ id &= im;
+
+ if (!id)
+ break;
+
+ for (i = 0; id != 0; i++, id >>= 1) {
+ if (!(id & 1))
+ continue;
+ hnd = &tahvo_irq_handlers[i];
+ if (hnd->func == NULL) {
+ /* Spurious tahvo interrupt - just ack it */
+ printk(KERN_INFO "Spurious Tahvo interrupt "
+ "(id %d)\n", i);
+ tahvo_disable_irq(i);
+ tahvo_ack_irq(i);
+ continue;
+ }
+ hnd->func(hnd->arg);
+ /*
+ * Don't acknowledge the interrupt here
+ * It must be done explicitly
+ */
+ }
+ }
+}
+
+/*
+ * Register the handler for a given TAHVO interrupt source.
+ */
+int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name)
+{
+ struct tahvo_irq_handler_desc *hnd;
+
+ if (irq_handler == NULL || id >= MAX_TAHVO_IRQ_HANDLERS ||
+ name == NULL) {
+ printk(KERN_ERR PFX "Invalid arguments to %s\n",
+ __FUNCTION__);
+ return -EINVAL;
+ }
+ hnd = &tahvo_irq_handlers[id];
+ if (hnd->func != NULL) {
+ printk(KERN_ERR PFX "IRQ %d already reserved\n", id);
+ return -EBUSY;
+ }
+ printk(KERN_INFO PFX "Registering interrupt %d for device %s\n",
+ id, name);
+ hnd->func = irq_handler;
+ hnd->arg = arg;
+ strlcpy(hnd->name, name, sizeof(hnd->name));
+
+ tahvo_ack_irq(id);
+ tahvo_enable_irq(id);
+
+ return 0;
+}
+
+/*
+ * Unregister the handler for a given TAHVO interrupt source.
+ */
+void tahvo_free_irq(int id)
+{
+ struct tahvo_irq_handler_desc *hnd;
+
+ if (id >= MAX_TAHVO_IRQ_HANDLERS) {
+ printk(KERN_ERR PFX "Invalid argument to %s\n",
+ __FUNCTION__);
+ return;
+ }
+ hnd = &tahvo_irq_handlers[id];
+ if (hnd->func == NULL) {
+ printk(KERN_ERR PFX "IRQ %d already freed\n", id);
+ return;
+ }
+
+ tahvo_disable_irq(id);
+ hnd->func = NULL;
+}
+
+/**
+ * tahvo_probe - Probe for Tahvo ASIC
+ * @dev: the Tahvo device
+ *
+ * Probe for the Tahvo ASIC and allocate memory
+ * for its device-struct if found
+ */
+static int __devinit tahvo_probe(struct device *dev)
+{
+ int rev, id, ret;
+
+ /* Prepare tasklet */
+ tasklet_init(&tahvo_tasklet, tahvo_tasklet_handler, 0);
+
+ tahvo_initialized = 1;
+
+ rev = tahvo_read_reg(TAHVO_REG_ASICR);
+
+ id = (rev >> 8) & 0xff;
+ if (id == 0x03) {
+ if ((rev & 0xff) >= 0x50)
+ tahvo_7bit_backlight = 1;
+ } else if (id == 0x0b) {
+ tahvo_is_betty = 1;
+ tahvo_7bit_backlight = 1;
+ } else {
+ printk(KERN_ERR "Tahvo/Betty chip not found");
+ return -ENODEV;
+ }
+
+ printk(KERN_INFO "%s v%d.%d found\n", tahvo_is_betty ? "Betty" : "Tahvo",
+ (rev >> 4) & 0x0f, rev & 0x0f);
+
+ /* REVISIT: Pass these from board-*.c files in platform_data */
+ if (machine_is_nokia770()) {
+ tahvo_irq_pin = 40;
+ } else if (machine_is_nokia_n800() || machine_is_nokia_n810() ||
+ machine_is_nokia_n810_wimax()) {
+ tahvo_irq_pin = 111;
+ } else {
+ printk(KERN_ERR "cbus: Unsupported board for tahvo\n");
+ return -ENODEV;
+ }
+
+ if ((ret = gpio_request(tahvo_irq_pin, "TAHVO irq")) < 0) {
+ printk(KERN_ERR PFX "Unable to reserve IRQ GPIO\n");
+ return ret;
+ }
+
+ /* Set the pin as input */
+ gpio_direction_input(tahvo_irq_pin);
+
+ /* Rising edge triggers the IRQ */
+ set_irq_type(gpio_to_irq(tahvo_irq_pin), IRQ_TYPE_EDGE_RISING);
+
+ /* Mask all TAHVO interrupts */
+ tahvo_write_reg(TAHVO_REG_IMR, 0xffff);
+
+ ret = request_irq(gpio_to_irq(tahvo_irq_pin), tahvo_irq_handler, 0,
+ "tahvo", 0);
+ if (ret < 0) {
+ printk(KERN_ERR PFX "Unable to register IRQ handler\n");
+ gpio_free(tahvo_irq_pin);
+ return ret;
+ }
+#ifdef CONFIG_CBUS_TAHVO_USER
+ /* Initialize user-space interface */
+ if (tahvo_user_init() < 0) {
+ printk(KERN_ERR "Unable to initialize driver\n");
+ free_irq(gpio_to_irq(tahvo_irq_pin), 0);
+ gpio_free(tahvo_irq_pin);
+ return ret;
+ }
+#endif
+ return 0;
+}
+
+static int tahvo_remove(struct device *dev)
+{
+#ifdef CONFIG_CBUS_TAHVO_USER
+ tahvo_user_cleanup();
+#endif
+ /* Mask all TAHVO interrupts */
+ tahvo_write_reg(TAHVO_REG_IMR, 0xffff);
+ free_irq(gpio_to_irq(tahvo_irq_pin), 0);
+ gpio_free(tahvo_irq_pin);
+ tasklet_kill(&tahvo_tasklet);
+
+ return 0;
+}
+
+static void tahvo_device_release(struct device *dev)
+{
+ complete(&device_release);
+}
+
+static struct device_driver tahvo_driver = {
+ .name = "tahvo",
+ .bus = &platform_bus_type,
+ .probe = tahvo_probe,
+ .remove = tahvo_remove,
+};
+
+static struct platform_device tahvo_device = {
+ .name = "tahvo",
+ .id = -1,
+ .dev = {
+ .release = tahvo_device_release,
+ }
+};
+
+/**
+ * tahvo_init - initialise Tahvo driver
+ *
+ * Initialise the Tahvo driver and return 0 if everything worked ok
+ */
+static int __init tahvo_init(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "Tahvo/Betty driver initialising\n");
+
+ init_completion(&device_release);
+
+ if ((ret = driver_register(&tahvo_driver)) < 0)
+ return ret;
+
+ if ((ret = platform_device_register(&tahvo_device)) < 0) {
+ driver_unregister(&tahvo_driver);
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Cleanup
+ */
+static void __exit tahvo_exit(void)
+{
+ platform_device_unregister(&tahvo_device);
+ driver_unregister(&tahvo_driver);
+ wait_for_completion(&device_release);
+}
+
+EXPORT_SYMBOL(tahvo_request_irq);
+EXPORT_SYMBOL(tahvo_free_irq);
+EXPORT_SYMBOL(tahvo_enable_irq);
+EXPORT_SYMBOL(tahvo_disable_irq);
+EXPORT_SYMBOL(tahvo_ack_irq);
+EXPORT_SYMBOL(tahvo_read_reg);
+EXPORT_SYMBOL(tahvo_write_reg);
+EXPORT_SYMBOL(tahvo_get_backlight_level);
+EXPORT_SYMBOL(tahvo_get_max_backlight_level);
+EXPORT_SYMBOL(tahvo_set_backlight_level);
+
+subsys_initcall(tahvo_init);
+module_exit(tahvo_exit);
+
+MODULE_DESCRIPTION("Tahvo ASIC control");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Juha Yrjölä, David Weinehall, and Mikko Ylinen");
Index: linux-2.6.37/drivers/cbus/tahvo.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/tahvo.h 2011-01-27 14:17:39.086000008 +0100
@@ -0,0 +1,61 @@
+/*
+ * 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_LEDPWMR 0x05 /* LED PWM */
+#define TAHVO_REG_USBR 0x06 /* USB control */
+#define TAHVO_REG_MAX 0x0d
+
+/* Interrupt sources */
+#define TAHVO_INT_VBUSON 0
+
+#define MAX_TAHVO_IRQ_HANDLERS 8
+
+int tahvo_read_reg(int reg);
+void tahvo_write_reg(int reg, u16 val);
+void tahvo_set_clear_reg_bits(int reg, u16 set, u16 clear);
+int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
+void tahvo_free_irq(int id);
+void tahvo_enable_irq(int id);
+void tahvo_disable_irq(int id);
+void tahvo_ack_irq(int id);
+int tahvo_get_backlight_level(void);
+int tahvo_get_max_backlight_level(void);
+void tahvo_set_backlight_level(int level);
+
+#ifdef CONFIG_CBUS_TAHVO_USER
+int tahvo_user_init(void);
+void tahvo_user_cleanup(void);
+#endif
+
+extern spinlock_t tahvo_lock;
+
+#endif /* __DRIVERS_CBUS_TAHVO_H */
Index: linux-2.6.37/drivers/cbus/tahvo-usb.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/tahvo-usb.c 2011-01-27 14:17:39.087000008 +0100
@@ -0,0 +1,788 @@
+/**
+ * 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 platform_device *pt_dev;
+ struct otg_transceiver otg;
+ int vbus_state;
+ struct work_struct irq_work;
+ struct mutex serialize;
+#ifdef CONFIG_USB_OTG
+ int tahvo_mode;
+#endif
+};
+static struct platform_device 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)
+{
+ struct platform_device *otg_dev = arg;
+ struct tahvo_usb *tu = platform_get_drvdata(otg_dev);
+ 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) {
+ 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);
+ }
+ omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
+ } else
+ return IRQ_NONE;
+
+ return IRQ_HANDLED;
+
+}
+
+static int tahvo_omap_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 omap_otg_probe(struct platform_device *pdev)
+{
+ int ret, err;
+
+ tahvo_otg_dev = pdev;
+ ret = tahvo_omap_otg_init();
+ if (ret != 0) {
+ printk(KERN_ERR "tahvo-usb: omap_otg_init failed\n");
+ return ret;
+ }
+
+ err = request_irq(tahvo_otg_dev->resource[1].start,
+ omap_otg_irq, IRQF_DISABLED, DRIVER_NAME,
+ &tahvo_usb_device);
+
+ return err;
+}
+
+static int omap_otg_remove(struct platform_device *pdev)
+{
+ free_irq(tahvo_otg_dev->resource[1].start, &tahvo_usb_device);
+ tahvo_otg_dev = NULL;
+
+ return 0;
+}
+
+static struct platform_driver omap_otg_driver = {
+ .probe = omap_otg_probe,
+ .remove = omap_otg_remove,
+ .driver = {
+ .name = "omap_otg",
+ }
+};
+
+/*
+ * ---------------------------------------------------------------------------
+ * 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 platform_device *pdev = to_platform_device(device);
+ struct tahvo_usb *tu = platform_get_drvdata(pdev);
+ return sprintf(buf, "%d\n", tu->vbus_state);
+}
+static DEVICE_ATTR(vbus_state, 0444, vbus_state_show, NULL);
+
+int vbus_active = 0;
+
+#if 0
+
+static int host_suspend(struct tahvo_usb *tu)
+{
+ struct device *dev;
+
+ if (!tu->otg.host)
+ return -ENODEV;
+
+ /* Currently ASSUMES only the OTG port matters;
+ * other ports could be active...
+ */
+ dev = tu->otg.host->controller;
+ return dev->driver->suspend(dev, PMSG_SUSPEND);
+}
+
+static int host_resume(struct tahvo_usb *tu)
+{
+ struct device *dev;
+
+ if (!tu->otg.host)
+ return -ENODEV;
+
+ dev = tu->otg.host->controller;
+ return dev->driver->resume(dev);
+}
+
+#else
+
+static int host_suspend(struct tahvo_usb *tu)
+{
+ return 0;
+}
+
+static int host_resume(struct tahvo_usb *tu)
+{
+ return 0;
+}
+
+#endif
+
+static void check_vbus_state(struct tahvo_usb *tu)
+{
+ int reg, prev_state;
+
+ reg = tahvo_read_reg(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;
+ host_resume(tu);
+ 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_omap_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(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)
+{
+ host_suspend(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_omap_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(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);
+
+ host_suspend(tu);
+
+ /* 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(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(TAHVO_REG_USBR);
+ if (suspend)
+ w &= ~USBR_NSUSPEND;
+ else
+ w |= USBR_NSUSPEND;
+ tahvo_write_reg(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);
+ } else
+ host_suspend(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 void tahvo_usb_irq_work(struct work_struct *work)
+{
+ struct tahvo_usb *tu = container_of(work, struct tahvo_usb, irq_work);
+
+ mutex_lock(&tu->serialize);
+ check_vbus_state(tu);
+ mutex_unlock(&tu->serialize);
+}
+
+static void tahvo_usb_vbus_interrupt(unsigned long arg)
+{
+ struct tahvo_usb *tu = (struct tahvo_usb *) arg;
+
+ tahvo_ack_irq(TAHVO_INT_VBUSON);
+ /* Seems we need this to acknowledge the interrupt */
+ tahvo_read_reg(TAHVO_REG_IDSR);
+ schedule_work(&tu->irq_work);
+}
+
+#ifdef CONFIG_USB_OTG
+static ssize_t otg_mode_show(struct device *device,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(device);
+ struct tahvo_usb *tu = platform_get_drvdata(pdev);
+
+ 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 platform_device *pdev = to_platform_device(device);
+ struct tahvo_usb *tu = platform_get_drvdata(pdev);
+ 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 tahvo_usb_probe(struct platform_device *pdev)
+{
+ struct tahvo_usb *tu;
+ int ret;
+
+ dev_dbg(&pdev->dev, "probe\n");
+
+ /* Create driver data */
+ tu = kmalloc(sizeof(*tu), GFP_KERNEL);
+ if (!tu)
+ return -ENOMEM;
+ memset(tu, 0, sizeof(*tu));
+ 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
+
+ INIT_WORK(&tu->irq_work, tahvo_usb_irq_work);
+ mutex_init(&tu->serialize);
+
+ /* Set initial state, so that we generate kevents only on
+ * state changes */
+ tu->vbus_state = tahvo_read_reg(TAHVO_REG_IDSR) & 0x01;
+
+ /* We cannot enable interrupt until omap_udc is initialized */
+ ret = tahvo_request_irq(TAHVO_INT_VBUSON, tahvo_usb_vbus_interrupt,
+ (unsigned long) tu, "vbus_interrupt");
+ if (ret != 0) {
+ kfree(tu);
+ printk(KERN_ERR "Could not register Tahvo interrupt for VBUS\n");
+ return ret;
+ }
+
+ /* Attributes */
+ ret = device_create_file(&pdev->dev, &dev_attr_vbus_state);
+#ifdef CONFIG_USB_OTG
+ ret |= device_create_file(&pdev->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");
+ kfree(tu);
+ tahvo_free_irq(TAHVO_INT_VBUSON);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tu);
+
+ /* Act upon current vbus state once at startup. A vbus state irq may or
+ * may not be generated in addition to this. */
+ schedule_work(&tu->irq_work);
+ return 0;
+}
+
+static int tahvo_usb_remove(struct platform_device *pdev)
+{
+ dev_dbg(&pdev->dev, "remove\n");
+
+ tahvo_free_irq(TAHVO_INT_VBUSON);
+ 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
+ return 0;
+}
+
+static struct platform_driver tahvo_usb_driver = {
+ .probe = tahvo_usb_probe,
+ .remove = tahvo_usb_remove,
+ .driver = {
+ .name = "tahvo-usb",
+ }
+};
+
+static struct platform_device tahvo_usb_device = {
+ .name = "tahvo-usb",
+ .id = -1,
+};
+
+static int __init tahvo_usb_init(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "Tahvo USB transceiver driver initializing\n");
+
+ ret = platform_driver_register(&tahvo_usb_driver);
+ if (ret)
+ return ret;
+ ret = platform_driver_register(&omap_otg_driver);
+ if (ret) {
+ platform_driver_unregister(&tahvo_usb_driver);
+ return ret;
+ }
+
+ ret = platform_device_register(&tahvo_usb_device);
+ if (ret) {
+ platform_driver_unregister(&omap_otg_driver);
+ platform_driver_unregister(&tahvo_usb_driver);
+ return ret;
+ }
+
+ return 0;
+}
+subsys_initcall(tahvo_usb_init);
+
+static void __exit tahvo_usb_exit(void)
+{
+ platform_device_unregister(&tahvo_usb_device);
+ 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");
Index: linux-2.6.37/drivers/cbus/tahvo-user.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/tahvo-user.c 2011-01-27 14:17:39.087000008 +0100
@@ -0,0 +1,406 @@
+/**
+ * drivers/cbus/tahvo-user.c
+ *
+ * Tahvo user space interface functions
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by 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/types.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+
+#include "tahvo.h"
+
+#include "user_retu_tahvo.h"
+
+/* Maximum size of IRQ node buffer/pool */
+#define TAHVO_MAX_IRQ_BUF_LEN 16
+
+#define PFX "tahvo-user: "
+
+/* Bitmap for marking the interrupt sources as having the handlers */
+static u32 tahvo_irq_bits;
+
+/* For allowing only one user process to subscribe to the tahvo interrupts */
+static struct file *tahvo_irq_subscr = NULL;
+
+/* For poll and IRQ passing */
+struct tahvo_irq {
+ u32 id;
+ struct list_head node;
+};
+
+static spinlock_t tahvo_irqs_lock;
+static struct tahvo_irq *tahvo_irq_block;
+static LIST_HEAD(tahvo_irqs);
+static LIST_HEAD(tahvo_irqs_reserve);
+
+/* Wait queue - used when user wants to read the device */
+DECLARE_WAIT_QUEUE_HEAD(tahvo_user_waitqueue);
+
+/* Semaphore to protect irq subscription sequence */
+static struct mutex tahvo_mutex;
+
+/* This array specifies TAHVO register types (read/write/toggle) */
+static const u8 tahvo_access_bits[] = {
+ 1,
+ 4,
+ 1,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 3,
+ 1
+};
+
+/*
+ * The handler for all TAHVO interrupts.
+ *
+ * arg is the interrupt source in TAHVO.
+ */
+static void tahvo_user_irq_handler(unsigned long arg)
+{
+ struct tahvo_irq *irq;
+
+ /* user has to re-enable the interrupt once ready
+ * for receiving them again */
+ tahvo_disable_irq(arg);
+ tahvo_ack_irq(arg);
+
+ spin_lock(&tahvo_irqs_lock);
+ if (list_empty(&tahvo_irqs_reserve)) {
+ spin_unlock(&tahvo_irqs_lock);
+ return;
+ }
+ irq = list_entry((&tahvo_irqs_reserve)->next, struct tahvo_irq, node);
+ irq->id = arg;
+ list_move_tail(&irq->node, &tahvo_irqs);
+ spin_unlock(&tahvo_irqs_lock);
+
+ /* wake up waiting thread */
+ wake_up(&tahvo_user_waitqueue);
+}
+
+/*
+ * This routine sets up the interrupt handler and marks an interrupt source
+ * in TAHVO as a candidate for signal delivery to the user process.
+ */
+static int tahvo_user_subscribe_to_irq(int id, struct file *filp)
+{
+ int ret;
+
+ mutex_lock(&tahvo_mutex);
+ if ((tahvo_irq_subscr != NULL) && (tahvo_irq_subscr != filp)) {
+ mutex_unlock(&tahvo_mutex);
+ return -EBUSY;
+ }
+ /* Store the file pointer of the first user process registering IRQs */
+ tahvo_irq_subscr = filp;
+ mutex_unlock(&tahvo_mutex);
+
+ if (tahvo_irq_bits & (1 << id))
+ return 0;
+
+ ret = tahvo_request_irq(id, tahvo_user_irq_handler, id, "");
+ if (ret < 0)
+ return ret;
+
+ /* Mark that this interrupt has a handler */
+ tahvo_irq_bits |= 1 << id;
+
+ return 0;
+}
+
+/*
+ * Unregister all TAHVO interrupt handlers
+ */
+static void tahvo_unreg_irq_handlers(void)
+{
+ int id;
+
+ if (!tahvo_irq_bits)
+ return;
+
+ for (id = 0; id < MAX_TAHVO_IRQ_HANDLERS; id++)
+ if (tahvo_irq_bits & (1 << id))
+ tahvo_free_irq(id);
+
+ tahvo_irq_bits = 0;
+}
+
+/*
+ * Write to TAHVO register.
+ * Returns 0 upon success, a negative error value otherwise.
+ */
+static int tahvo_user_write_with_mask(u32 field, u16 value)
+{
+ u32 mask;
+ u32 reg;
+ u_short tmp;
+ unsigned long flags;
+
+ mask = MASK(field);
+ reg = REG(field);
+
+ /* Detect bad mask and reg */
+ if (mask == 0 || reg > TAHVO_REG_MAX ||
+ tahvo_access_bits[reg] == READ_ONLY) {
+ printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
+ reg, mask);
+ return -EINVAL;
+ }
+
+ /* Justify value according to mask */
+ while (!(mask & 1)) {
+ value = value << 1;
+ mask = mask >> 1;
+ }
+
+ spin_lock_irqsave(&tahvo_lock, flags);
+ if (tahvo_access_bits[reg] == TOGGLE) {
+ /* No need to detect previous content of register */
+ tmp = 0;
+ } else {
+ /* Read current value of register */
+ tmp = tahvo_read_reg(reg);
+ }
+ /* Generate a new value */
+ tmp = (tmp & ~MASK(field)) | (value & MASK(field));
+ /* Write data to TAHVO */
+ tahvo_write_reg(reg, tmp);
+ spin_unlock_irqrestore(&tahvo_lock, flags);
+
+ return 0;
+}
+
+/*
+ * Read TAHVO register.
+ */
+static u32 tahvo_user_read_with_mask(u32 field)
+{
+ u_short value;
+ u32 mask, reg;
+
+ mask = MASK(field);
+ reg = REG(field);
+
+ /* Detect bad mask and reg */
+ if (mask == 0 || reg > TAHVO_REG_MAX) {
+ printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
+ reg, mask);
+ return -EINVAL;
+ }
+
+ /* Read the register */
+ value = tahvo_read_reg(reg) & mask;
+
+ /* Right justify value */
+ while (!(mask & 1)) {
+ value = value >> 1;
+ mask = mask >> 1;
+ }
+
+ return value;
+}
+
+/*
+ * Close device
+ */
+static int tahvo_close(struct inode *inode, struct file *filp)
+{
+ /* Unregister all interrupts that have been registered */
+ if (tahvo_irq_subscr == filp) {
+ tahvo_unreg_irq_handlers();
+ tahvo_irq_subscr = NULL;
+ }
+
+ return 0;
+}
+
+/*
+ * Device control (ioctl)
+ */
+static long tahvo_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct retu_tahvo_write_parms par;
+ int ret;
+
+ switch (cmd) {
+ case URT_IOCT_IRQ_SUBSCR:
+ return tahvo_user_subscribe_to_irq(arg, filp);
+ case TAHVO_IOCH_READ:
+ return tahvo_user_read_with_mask(arg);
+ case TAHVO_IOCX_WRITE:
+ ret = copy_from_user(&par, (void __user *) arg, sizeof(par));
+ if (ret)
+ printk(KERN_ERR "copy_from_user failed: %d\n", ret);
+ par.result = tahvo_user_write_with_mask(par.field, par.value);
+ ret = copy_to_user((void __user *) arg, &par, sizeof(par));
+ if (ret)
+ printk(KERN_ERR "copy_to_user failed: %d\n", ret);
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+/*
+ * Read from device
+ */
+static ssize_t tahvo_read(struct file *filp, char *buf, size_t count,
+ loff_t * offp)
+{
+ struct tahvo_irq *irq;
+
+ u32 nr, i;
+
+ /* read not permitted if neither filp nor anyone has registered IRQs */
+ if (tahvo_irq_subscr != filp)
+ return -EPERM;
+
+ if ((count < sizeof(u32)) || ((count % sizeof(u32)) != 0))
+ return -EINVAL;
+
+ nr = count / sizeof(u32);
+
+ for (i = 0; i < nr; i++) {
+ unsigned long flags;
+ u32 irq_id;
+ int ret;
+
+ ret = wait_event_interruptible(tahvo_user_waitqueue,
+ !list_empty(&tahvo_irqs));
+ if (ret < 0)
+ return ret;
+
+ spin_lock_irqsave(&tahvo_irqs_lock, flags);
+ irq = list_entry((&tahvo_irqs)->next, struct tahvo_irq, node);
+ irq_id = irq->id;
+ list_move(&irq->node, &tahvo_irqs_reserve);
+ spin_unlock_irqrestore(&tahvo_irqs_lock, flags);
+
+ ret = copy_to_user(buf + i * sizeof(irq_id), &irq_id,
+ sizeof(irq_id));
+ if (ret)
+ printk(KERN_ERR "copy_to_user failed: %d\n", ret);
+ }
+
+ return count;
+}
+
+/*
+ * Poll method
+ */
+static unsigned tahvo_poll(struct file *filp, struct poll_table_struct *pt)
+{
+ if (!list_empty(&tahvo_irqs))
+ return POLLIN;
+
+ poll_wait(filp, &tahvo_user_waitqueue, pt);
+
+ if (!list_empty(&tahvo_irqs))
+ return POLLIN;
+ else
+ return 0;
+}
+
+static struct file_operations tahvo_user_fileops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = tahvo_ioctl,
+ .read = tahvo_read,
+ .release = tahvo_close,
+ .poll = tahvo_poll
+};
+
+static struct miscdevice tahvo_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "tahvo",
+ .fops = &tahvo_user_fileops
+};
+
+/*
+ * Initialization
+ *
+ * @return 0 if successful, error value otherwise.
+ */
+int tahvo_user_init(void)
+{
+ struct tahvo_irq *irq;
+ int res, i;
+
+ irq = kmalloc(sizeof(*irq) * TAHVO_MAX_IRQ_BUF_LEN, GFP_KERNEL);
+ if (irq == NULL) {
+ printk(KERN_ERR PFX "kmalloc failed\n");
+ return -ENOMEM;
+ }
+ memset(irq, 0, sizeof(*irq) * TAHVO_MAX_IRQ_BUF_LEN);
+ for (i = 0; i < TAHVO_MAX_IRQ_BUF_LEN; i++)
+ list_add(&irq[i].node, &tahvo_irqs_reserve);
+
+ tahvo_irq_block = irq;
+
+ spin_lock_init(&tahvo_irqs_lock);
+ mutex_init(&tahvo_mutex);
+
+ /* Request a misc device */
+ res = misc_register(&tahvo_device);
+ if (res < 0) {
+ printk(KERN_ERR PFX "unable to register misc device for %s\n",
+ tahvo_device.name);
+ kfree(irq);
+ return res;
+ }
+
+ return 0;
+}
+
+/*
+ * Cleanup.
+ */
+void tahvo_user_cleanup(void)
+{
+ /* Unregister our misc device */
+ misc_deregister(&tahvo_device);
+ /* Unregister and disable all TAHVO interrupts */
+ tahvo_unreg_irq_handlers();
+ kfree(tahvo_irq_block);
+}
+
+MODULE_DESCRIPTION("Tahvo ASIC user space functions");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mikko Ylinen");
Index: linux-2.6.37/drivers/cbus/user_retu_tahvo.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.37/drivers/cbus/user_retu_tahvo.h 2011-01-27 14:17:39.087000008 +0100
@@ -0,0 +1,75 @@
+/**
+ * drivers/cbus/user_retu_tahvo.h
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Mikko Ylinen <mikko.k.ylinen@nokia.com>
+ *
+ * Definitions and types used by both retu-user and tahvo-user.
+ *
+ * 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 _USER_RETU_TAHVO_H
+#define _USER_RETU_TAHVO_H
+
+/* Chip IDs */
+#define CHIP_RETU 1
+#define CHIP_TAHVO 2
+
+/* Register access type bits */
+#define READ_ONLY 1
+#define WRITE_ONLY 2
+#define READ_WRITE 3
+#define TOGGLE 4
+
+#define MASK(field) ((u16)(field & 0xFFFF))
+#define REG(field) ((u16)((field >> 16) & 0x3F))
+
+/*** IOCTL definitions. These should be kept in sync with user space **********/
+
+#define URT_IOC_MAGIC '`'
+
+/*
+ * IOCTL function naming conventions:
+ * ==================================
+ * 0 -- No argument and return value
+ * S -- Set through a pointer
+ * T -- Tell directly with the argument value
+ * G -- Reply by setting through a pointer
+ * Q -- response is on the return value
+ * X -- S and G atomically
+ * H -- T and Q atomically
+ */
+
+/* General */
+#define URT_IOCT_IRQ_SUBSCR _IO(URT_IOC_MAGIC, 0)
+
+/* RETU */
+#define RETU_IOCH_READ _IO(URT_IOC_MAGIC, 1)
+#define RETU_IOCX_WRITE _IO(URT_IOC_MAGIC, 2)
+#define RETU_IOCH_ADC_READ _IO(URT_IOC_MAGIC, 3)
+
+/* TAHVO */
+#define TAHVO_IOCH_READ _IO(URT_IOC_MAGIC, 4)
+#define TAHVO_IOCX_WRITE _IO(URT_IOC_MAGIC, 5)
+
+/* This structure is used for writing RETU/TAHVO registers */
+struct retu_tahvo_write_parms {
+ u32 field;
+ u16 value;
+ u8 result;
+};
+
+#endif
Index: linux-2.6.37/drivers/Makefile
===================================================================
--- linux-2.6.37.orig/drivers/Makefile 2011-01-27 14:17:04.232000007 +0100
+++ linux-2.6.37/drivers/Makefile 2011-01-27 14:17:39.087000008 +0100
@@ -74,7 +74,7 @@
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-$(CONFIG_W1) += w1/
obj-$(CONFIG_POWER_SUPPLY) += power/
Index: linux-2.6.37/arch/arm/Kconfig
===================================================================
--- linux-2.6.37.orig/arch/arm/Kconfig 2011-01-27 14:17:04.178000007 +0100
+++ linux-2.6.37/arch/arm/Kconfig 2011-01-27 14:17:39.087000008 +0100
@@ -1850,6 +1850,10 @@
source "drivers/Kconfig"
+if ARCH_OMAP
+source "drivers/cbus/Kconfig"
+endif
+
source "fs/Kconfig"
source "arch/arm/Kconfig.debug"
Reference in New Issue View Git Blame Copy Permalink