From: Tony Lindgren Date: Tue, 7 Apr 2009 23:19:46 +0000 (-0700) Subject: Add Nokia CBUS support X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=commitdiff_plain;h=14fc69723d3442ef46f8f82b3f481e82f06a346d Add Nokia CBUS support --- diff --git a/drivers/Makefile b/drivers/Makefile index 2618a6169a1..1ba9e471ca4 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -34,6 +34,8 @@ obj-$(CONFIG_CONNECTOR) += connector/ obj-$(CONFIG_FB_I810) += video/i810/ obj-$(CONFIG_FB_INTEL) += video/intelfb/ +obj-y += cbus/ + obj-y += serial/ obj-$(CONFIG_PARPORT) += parport/ obj-y += base/ block/ misc/ mfd/ media/ diff --git a/drivers/cbus/Kconfig b/drivers/cbus/Kconfig new file mode 100644 index 00000000000..25f80394a60 --- /dev/null +++ b/drivers/cbus/Kconfig @@ -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 + 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 diff --git a/drivers/cbus/Makefile b/drivers/cbus/Makefile new file mode 100644 index 00000000000..347c2a465af --- /dev/null +++ b/drivers/cbus/Makefile @@ -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 diff --git a/drivers/cbus/cbus.c b/drivers/cbus/cbus.c new file mode 100644 index 00000000000..774acceb140 --- /dev/null +++ b/drivers/cbus/cbus.c @@ -0,0 +1,293 @@ +/* + * drivers/cbus/cbus.c + * + * Support functions for CBUS serial protocol + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä , + * David Weinehall , and + * Mikko Ylinen + * + * 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 +#include +#include +#include +#include +#include + +#include +#include + +#include + +#include "cbus.h" + +struct cbus_host *cbus_host = NULL; + +#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(OMAP_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; +} + +/* + * 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; +} + +int __init cbus_bus_init(void) +{ + const struct omap_cbus_config * cbus_config; + struct cbus_host *chost; + int ret; + + chost = kmalloc(sizeof (*chost), GFP_KERNEL); + if (chost == NULL) + return -ENOMEM; + + memset(chost, 0, sizeof (*chost)); + + spin_lock_init(&chost->lock); + + cbus_config = omap_get_config(OMAP_TAG_CBUS, struct omap_cbus_config); + + if (cbus_config == NULL) { + printk(KERN_ERR "cbus: Unable to retrieve config data\n"); + return -ENODATA; + } + + chost->clk_gpio = cbus_config->clk_gpio; + chost->dat_gpio = cbus_config->dat_gpio; + chost->sel_gpio = cbus_config->sel_gpio; + +#ifdef CONFIG_ARCH_OMAP1 + if (!OMAP_GPIO_IS_MPUIO(chost->clk_gpio) || + !OMAP_GPIO_IS_MPUIO(chost->dat_gpio) || + !OMAP_GPIO_IS_MPUIO(chost->sel_gpio)) { + printk(KERN_ERR "cbus: Only MPUIO pins supported\n"); + ret = -ENODEV; + goto exit1; + } +#endif + + 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); + + cbus_host = chost; + + return 0; +exit3: + gpio_free(chost->dat_gpio); +exit2: + gpio_free(chost->clk_gpio); +exit1: + kfree(chost); + return ret; +} + +subsys_initcall(cbus_bus_init); + +EXPORT_SYMBOL(cbus_host); +EXPORT_SYMBOL(cbus_read_reg); +EXPORT_SYMBOL(cbus_write_reg); + +MODULE_DESCRIPTION("CBUS serial protocol"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Juha Yrjölä, David Weinehall, and Mikko Ylinen"); diff --git a/drivers/cbus/cbus.h b/drivers/cbus/cbus.h new file mode 100644 index 00000000000..957224cf77b --- /dev/null +++ b/drivers/cbus/cbus.h @@ -0,0 +1,36 @@ +/* + * drivers/cbus/cbus.h + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä and + * David Weinehall + * + * 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 */ diff --git a/drivers/cbus/retu-headset.c b/drivers/cbus/retu-headset.c new file mode 100644 index 00000000000..e798bc2b7c1 --- /dev/null +++ b/drivers/cbus/retu-headset.c @@ -0,0 +1,355 @@ +/** + * 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 +#include +#include +#include +#include +#include + +#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"); diff --git a/drivers/cbus/retu-pwrbutton.c b/drivers/cbus/retu-pwrbutton.c new file mode 100644 index 00000000000..38d7aa42873 --- /dev/null +++ b/drivers/cbus/retu-pwrbutton.c @@ -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 + * + * Contact 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 +#include +#include +#include +#include +#include +#include +#include + +#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"); diff --git a/drivers/cbus/retu-rtc.c b/drivers/cbus/retu-rtc.c new file mode 100644 index 00000000000..1ebc33b6fb4 --- /dev/null +++ b/drivers/cbus/retu-rtc.c @@ -0,0 +1,477 @@ +/** + * drivers/cbus/retu-rtc.c + * + * Support for Retu RTC + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Paul Mundt and + * Igor Stoppa + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +#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"); diff --git a/drivers/cbus/retu-user.c b/drivers/cbus/retu-user.c new file mode 100644 index 00000000000..74a7d612e7e --- /dev/null +++ b/drivers/cbus/retu-user.c @@ -0,0 +1,423 @@ +/** + * drivers/cbus/retu-user.c + * + * Retu user space interface functions + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Mikko Ylinen + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#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 int retu_ioctl(struct inode *inode, 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, + .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"); diff --git a/drivers/cbus/retu-wdt.c b/drivers/cbus/retu-wdt.c new file mode 100644 index 00000000000..b7b20b7151a --- /dev/null +++ b/drivers/cbus/retu-wdt.c @@ -0,0 +1,202 @@ +/** + * drivers/cbus/retu-wdt.c + * + * Driver for Retu watchdog + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Amit Kucheria + * + * 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 +#include +#include +#include + +#include +#include +#include +#include + +#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; + +static int retu_modify_counter(unsigned int new) +{ + int ret = 0; + + if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER) + return -EINVAL; + + mutex_lock(&retu_wdt_mutex); + + period_val = new; + retu_write_reg(RETU_REG_WATCHDOG, (u16)period_val); + + mutex_unlock(&retu_wdt_mutex); + return ret; +} + +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); +} + +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; + + 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); + +static int __devinit retu_wdt_probe(struct device *dev) +{ + int ret; + + ret = device_create_file(dev, &dev_attr_period); + if (ret) { + printk(KERN_ERR "retu_wdt_probe: Error creating " + "sys device file: period\n"); + return ret; + } + + ret = device_create_file(dev, &dev_attr_counter); + if (ret) { + device_remove_file(dev, &dev_attr_period); + printk(KERN_ERR "retu_wdt_probe: Error creating " + "sys device file: counter\n"); + } + + return ret; +} + +static int __devexit retu_wdt_remove(struct device *dev) +{ + device_remove_file(dev, &dev_attr_period); + device_remove_file(dev, &dev_attr_counter); + 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"); + diff --git a/drivers/cbus/retu.c b/drivers/cbus/retu.c new file mode 100644 index 00000000000..84d784065c7 --- /dev/null +++ b/drivers/cbus/retu.c @@ -0,0 +1,467 @@ +/** + * drivers/cbus/retu.c + * + * Support functions for Retu ASIC + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä , + * David Weinehall , and + * Mikko Ylinen + * + * 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 +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + +#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) +{ + const struct omap_em_asic_bb5_config * em_asic_config; + int rev, ret; + + /* Prepare tasklet */ + tasklet_init(&retu_tasklet, retu_tasklet_handler, 0); + + em_asic_config = omap_get_config(OMAP_TAG_EM_ASIC_BB5, + struct omap_em_asic_bb5_config); + if (em_asic_config == NULL) { + printk(KERN_ERR PFX "Unable to retrieve config data\n"); + return -ENODATA; + } + + retu_irq_pin = em_asic_config->retu_irq_gpio; + + 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"); diff --git a/drivers/cbus/retu.h b/drivers/cbus/retu.h new file mode 100644 index 00000000000..c9e044c1494 --- /dev/null +++ b/drivers/cbus/retu.h @@ -0,0 +1,77 @@ +/** + * drivers/cbus/retu.h + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä and + * David Weinehall + * + * 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 + +/* 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 */ diff --git a/drivers/cbus/tahvo-usb.c b/drivers/cbus/tahvo-usb.c new file mode 100644 index 00000000000..d8ad836d501 --- /dev/null +++ b/drivers/cbus/tahvo-usb.c @@ -0,0 +1,777 @@ +/** + * 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 , + * Tony Lindgren , and + * Timo Teräs + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#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 = (struct platform_device *) arg; + struct tahvo_usb *tu = (struct tahvo_usb *) otg_dev->dev.driver_data; + 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 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 device *dev) +{ + int ret; + + tahvo_otg_dev = to_platform_device(dev); + ret = omap_otg_init(); + if (ret != 0) { + printk(KERN_ERR "tahvo-usb: omap_otg_init failed\n"); + return ret; + } + + return request_irq(tahvo_otg_dev->resource[1].start, + omap_otg_irq, IRQF_DISABLED, DRIVER_NAME, + &tahvo_usb_device); +} + +static int omap_otg_remove(struct device *dev) +{ + free_irq(tahvo_otg_dev->resource[1].start, &tahvo_usb_device); + tahvo_otg_dev = NULL; + + return 0; +} + +struct device_driver omap_otg_driver = { + .name = "omap_otg", + .bus = &platform_bus_type, + .probe = omap_otg_probe, + .remove = omap_otg_remove, +}; + +/* + * --------------------------------------------------------------------------- + * Tahvo related functions + * These are Nokia proprietary code, except for the OTG register settings, + * which are copied from isp1301.c + * --------------------------------------------------------------------------- + */ +static ssize_t vbus_state_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + 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 */ + 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 */ + 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 tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + switch (tu->tahvo_mode) { + case TAHVO_MODE_HOST: + return sprintf(buf, "host\n"); + case TAHVO_MODE_PERIPHERAL: + return sprintf(buf, "peripheral\n"); + } + return sprintf(buf, "unknown\n"); +} + +static ssize_t otg_mode_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + 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 device *dev) +{ + struct tahvo_usb *tu; + int ret; + + dev_dbg(dev, "probe\n"); + + /* Create driver data */ + tu = kmalloc(sizeof(*tu), GFP_KERNEL); + if (!tu) + return -ENOMEM; + memset(tu, 0, sizeof(*tu)); + tu->pt_dev = container_of(dev, struct platform_device, dev); +#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(dev, &dev_attr_vbus_state); +#ifdef CONFIG_USB_OTG + ret |= device_create_file(dev, &dev_attr_otg_mode); +#endif + if (ret) + printk(KERN_ERR "attribute creation failed: %d\n", ret); + + /* Create OTG interface */ + tahvo_usb_power_off(tu); + tu->otg.state = OTG_STATE_UNDEFINED; + tu->otg.label = DRIVER_NAME; + tu->otg.set_host = tahvo_usb_set_host; + tu->otg.set_peripheral = tahvo_usb_set_peripheral; + tu->otg.set_power = tahvo_usb_set_power; + tu->otg.set_suspend = tahvo_usb_set_suspend; + tu->otg.start_srp = tahvo_usb_start_srp; + tu->otg.start_hnp = tahvo_usb_start_hnp; + + ret = otg_set_transceiver(&tu->otg); + if (ret < 0) { + printk(KERN_ERR "Cannot register USB transceiver\n"); + kfree(tu); + tahvo_free_irq(TAHVO_INT_VBUSON); + return ret; + } + + dev->driver_data = 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 device *dev) +{ + dev_dbg(dev, "remove\n"); + + tahvo_free_irq(TAHVO_INT_VBUSON); + flush_scheduled_work(); + otg_set_transceiver(0); + device_remove_file(dev, &dev_attr_vbus_state); +#ifdef CONFIG_USB_OTG + device_remove_file(dev, &dev_attr_otg_mode); +#endif + return 0; +} + +static struct device_driver tahvo_usb_driver = { + .name = "tahvo-usb", + .bus = &platform_bus_type, + .probe = tahvo_usb_probe, + .remove = tahvo_usb_remove, +}; + +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 = driver_register(&tahvo_usb_driver); + if (ret) + return ret; + ret = platform_device_register(&tahvo_usb_device); + if (ret < 0) { + driver_unregister(&tahvo_usb_driver); + return ret; + } + ret = driver_register(&omap_otg_driver); + if (ret) { + platform_device_unregister(&tahvo_usb_device); + driver_unregister(&tahvo_usb_driver); + return ret; + } + return 0; +} + +subsys_initcall(tahvo_usb_init); + +static void __exit tahvo_usb_exit(void) +{ + driver_unregister(&omap_otg_driver); + platform_device_unregister(&tahvo_usb_device); + 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"); diff --git a/drivers/cbus/tahvo-user.c b/drivers/cbus/tahvo-user.c new file mode 100644 index 00000000000..873d6481573 --- /dev/null +++ b/drivers/cbus/tahvo-user.c @@ -0,0 +1,405 @@ +/** + * drivers/cbus/tahvo-user.c + * + * Tahvo user space interface functions + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Mikko Ylinen + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#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 int tahvo_ioctl(struct inode *inode, 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, + .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"); diff --git a/drivers/cbus/tahvo.c b/drivers/cbus/tahvo.c new file mode 100644 index 00000000000..e734c4c4905 --- /dev/null +++ b/drivers/cbus/tahvo.c @@ -0,0 +1,442 @@ +/** + * drivers/cbus/tahvo.c + * + * Support functions for Tahvo ASIC + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä , + * David Weinehall , and + * Mikko Ylinen + * + * 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 +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include + +#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) +{ + const struct omap_em_asic_bb5_config * em_asic_config; + int rev, id, ret; + + /* Prepare tasklet */ + tasklet_init(&tahvo_tasklet, tahvo_tasklet_handler, 0); + + em_asic_config = omap_get_config(OMAP_TAG_EM_ASIC_BB5, + struct omap_em_asic_bb5_config); + if (em_asic_config == NULL) { + printk(KERN_ERR PFX "Unable to retrieve config data\n"); + return -ENODATA; + } + + 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); + + tahvo_irq_pin = em_asic_config->tahvo_irq_gpio; + + 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"); diff --git a/drivers/cbus/tahvo.h b/drivers/cbus/tahvo.h new file mode 100644 index 00000000000..b7a8ee1758e --- /dev/null +++ b/drivers/cbus/tahvo.h @@ -0,0 +1,61 @@ +/* + * drivers/cbus/tahvo.h + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Juha Yrjölä and + * David Weinehall + * + * 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 + +/* 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 */ diff --git a/drivers/cbus/user_retu_tahvo.h b/drivers/cbus/user_retu_tahvo.h new file mode 100644 index 00000000000..a5c219026c5 --- /dev/null +++ b/drivers/cbus/user_retu_tahvo.h @@ -0,0 +1,75 @@ +/** + * drivers/cbus/user_retu_tahvo.h + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Written by Mikko Ylinen + * + * 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