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new_modules.patch
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new_modules.patch
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Index: package/kernel/gpio-dht-handler/src/Makefile
===================================================================
--- /dev/null
+++ package/kernel/gpio-dht-handler/src/Makefile
@@ -0,0 +1 @@
+obj-m += gpio-dht-handler.o
Index: package/kernel/gpio-dht-handler/Makefile
===================================================================
--- /dev/null
+++ package/kernel/gpio-dht-handler/Makefile
@@ -0,0 +1,45 @@
+#
+# Copyright (C) 2008-2012 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=gpio-dht-handler
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/gpio-dht-handler
+ SUBMENU:=Other modules
+ DEPENDS:=@!LINUX_3_3
+ TITLE:=DHT11 and DHT22 protocol handler
+ FILES:=$(PKG_BUILD_DIR)/gpio-dht-handler.ko
+ AUTOLOAD:=$(call AutoLoad,30,gpio-dht-handler,1)
+ KCONFIG:=
+endef
+
+define KernelPackage/gpio-dht-handler/description
+ This is a DHT11/DHT22 temperature and humidity sensor kernel module for AR9331 devices.
+endef
+
+MAKE_OPTS:= \
+ ARCH="$(LINUX_KARCH)" \
+ CROSS_COMPILE="$(TARGET_CROSS)" \
+ SUBDIRS="$(PKG_BUILD_DIR)"
+
+define Build/Prepare
+ mkdir -p $(PKG_BUILD_DIR)
+ $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+ $(MAKE) -C "$(LINUX_DIR)" \
+ $(MAKE_OPTS) \
+ modules
+endef
+
+$(eval $(call KernelPackage,gpio-dht-handler))
Index: package/kernel/gpio-dht-handler/src/gpio-dht-handler.c
===================================================================
--- /dev/null
+++ package/kernel/gpio-dht-handler/src/gpio-dht-handler.c
@@ -0,0 +1,462 @@
+/*
+ * GPIO IRQ DHT sensor module for AR9331
+ *
+ * Copyright (C) 2015 Dmitriy Zherebkov <[email protected]>
+ * Copyright (C) 2015 Oleg Artamonov <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/irq.h>
+
+#include <asm/delay.h>
+#include <asm/siginfo.h>
+
+#include <linux/rcupdate.h>
+#include <linux/sched.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+//#define DEBUG_OUT
+
+#ifdef DEBUG_OUT
+#define debug(fmt,args...) printk (KERN_INFO fmt ,##args)
+#else
+#define debug(fmt,args...)
+#endif /* DEBUG_OUT */
+
+#define SIG_DHT_IRQ 44 // So we have to hardcode this value
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define DRV_NAME "GPIO IRQ DHT"
+#define FILE_NAME "irq-dht"
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define GPIO_OFFS_READ 0x04
+#define GPIO_OFFS_SET 0x0C
+#define GPIO_OFFS_CLEAR 0x10
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+void __iomem *gpio_addr=NULL;
+void __iomem *gpio_readdata_addr=NULL;
+void __iomem *gpio_setdataout_addr=NULL;
+void __iomem *gpio_cleardataout_addr=NULL;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define DHT11 11
+#define DHT22 22
+
+////////////////////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+ int gpio;
+ int irq;
+ int counter;
+ int value[43];
+} _gpio_handler;
+
+static _gpio_handler _ghandler;
+
+static struct dentry* in_file;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int is_space(char symbol)
+{
+ return (symbol == ' ') || (symbol == '\t');
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int is_digit(char symbol)
+{
+ return (symbol >= '0') && (symbol <= '9');
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static irqreturn_t gpio_edge_interrupt(int irq, void* dev_id)
+{
+ _gpio_handler* handler=(_gpio_handler*)dev_id;
+
+ if(handler && (handler->irq == irq) && (handler->counter < 43))
+ {
+ if (((__raw_readl(gpio_addr + GPIO_OFFS_READ) >> handler->gpio) & 1) == 1)
+ {
+ udelay(35);
+ handler->value[handler->counter] = (__raw_readl(gpio_addr + GPIO_OFFS_READ) >> handler->gpio) & 1;
+ handler->counter++;
+ }
+ }
+ else
+ {
+ debug("IRQ %d event - no handlers found!\n",irq);
+ }
+
+ return (IRQ_HANDLED);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int add_irq(int gpio,void* data)
+{
+ if(gpio_request(gpio, DRV_NAME) >= 0)
+ {
+ int irq_number=gpio_to_irq(gpio);
+
+ if(irq_number >= 0)
+ {
+ int err = request_irq(irq_number, gpio_edge_interrupt, IRQ_TYPE_EDGE_BOTH, "gpio_irq_handler", data);
+
+ if(!err)
+ {
+ debug("Got IRQ %d for GPIO %d\n", irq_number, gpio);
+ return irq_number;
+ }
+ else
+ {
+ debug("GPIO IRQ handler: trouble requesting IRQ %d error %d\n",irq_number, err);
+ }
+ }
+ else
+ {
+ debug("Can't map GPIO %d to IRQ : error %d\n",gpio, irq_number);
+ }
+ }
+ else
+ {
+ debug("Can't get GPIO %d\n", gpio);
+ }
+
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static void free_handler(void)
+{
+ _gpio_handler* handler=&_ghandler;
+
+ if(handler->gpio > 0)
+ {
+ if(handler->irq >= 0)
+ {
+ free_irq(handler->irq, (void*)handler);
+ handler->irq=-1;
+ }
+
+ gpio_free(handler->gpio);
+ handler->gpio=-1;
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int add_handler(int gpio)
+{
+ _gpio_handler* handler=&_ghandler;
+
+ if(handler->gpio != gpio)
+ {
+ int irq=add_irq(gpio, handler);
+
+ if(irq < 0)
+ {
+ free_handler();
+ return -1;
+ }
+
+ handler->gpio=gpio;
+ handler->irq=irq;
+
+ return 0;
+ }
+
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static ssize_t run_command(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char buffer[512];
+ char line[20];
+ char* in_pos=NULL;
+ char* end=NULL;
+ char* out_pos=NULL;
+
+ int gpio=-1;
+ pid_t pid=0;
+
+ if(count > 512)
+ return -EINVAL; // file is too big
+
+ copy_from_user(buffer, buf, count);
+ buffer[count]=0;
+
+ debug("Command is found (%u bytes length):\n%s\n",count,buffer);
+
+ in_pos=buffer;
+ end=in_pos+count-1;
+
+ while(in_pos < end)
+ {
+ gpio=-1;
+
+ while((in_pos < end) && is_space(*in_pos)) ++in_pos; // skip whitespace
+ if(in_pos >= end) break;
+
+ out_pos=line;
+ while((in_pos < end) && is_digit(*in_pos)) *out_pos++=*in_pos++;
+ *out_pos=0;
+
+ if(is_digit(line[0]))
+ {
+ sscanf(line, "%d", &gpio);
+ }
+ else
+ {
+ printk(KERN_INFO "Can't read GPIO number.\n");
+ break;
+ }
+
+ while((in_pos < end) && is_space(*in_pos)) ++in_pos; // skip whitespace
+
+ out_pos=line;
+ while((in_pos < end) && is_digit(*in_pos)) *out_pos++=*in_pos++;
+ *out_pos=0;
+
+ if(is_digit(line[0]))
+ {
+ sscanf(line, "%u", &pid);
+ }
+
+ add_handler(gpio);
+
+ _ghandler.counter=0;
+ gpio_direction_output(gpio,0);
+ __raw_writel(1 << gpio, gpio_cleardataout_addr);
+ udelay(2000);
+ __raw_writel(1 << gpio, gpio_setdataout_addr);
+ udelay(20);
+ gpio_direction_input(gpio);
+
+ udelay(100000); // 100 ms sleep
+
+ free_handler();
+
+ debug("Total %d values:\n",_ghandler.counter);
+
+ if(_ghandler.counter == 43)
+ {
+ int b=0;
+
+ int data[5] = { 0,0,0,0,0 };
+ int octet=0;
+
+ int i=2; // skip first two pulses
+
+ for(; i < _ghandler.counter - 1; ++i)
+ {
+ if(_ghandler.value[i])
+ {
+ if(octet < 5)
+ {
+ data[octet]|=1 << (7-(b % 8));
+ }
+ }
+
+ if((++b % 8) == 0)
+ {
+ ++octet;
+ }
+ }
+
+ int type=((data[1] == 0) && (data[3] == 0))?DHT11:DHT22;
+
+ bool isOK=false;
+
+ debug("type: %d\n",type);
+
+ if( (((data[0]+data[1]+data[2]+data[3]) & 0xff) == data[4]) &&
+ (data[0] || data[1] || data[2] || data[3]))
+ {
+ isOK=true;
+ }
+
+ if(isOK)
+ {
+ if(pid != 0)
+ {
+ struct siginfo info;
+ struct task_struct* ts=NULL;
+ unsigned short t=0;
+ unsigned short h=0;
+
+ if(type == DHT11)
+ {
+ t=data[2]*10;
+ h=data[0]*10;
+ }
+ else
+ {
+ t=((data[2] & 0x7f)*256+data[3]);
+ h=data[0]*256+data[1];
+
+ if(data[2] & 0x80) // temperature < 0
+ {
+ t|=0x8000;
+ }
+ }
+
+ /* send the signal */
+ memset(&info, 0, sizeof(struct siginfo));
+ info.si_signo = SIG_DHT_IRQ;
+ info.si_code = SI_QUEUE; // this is bit of a trickery: SI_QUEUE is normally used by sigqueue from user space,
+ // and kernel space should use SI_KERNEL. But if SI_KERNEL is used the real_time data
+ // is not delivered to the user space signal handler function.
+
+ info.si_int=(h << 16) | t;
+
+ rcu_read_lock();
+ ts=pid_task(find_vpid(pid), PIDTYPE_PID);
+ rcu_read_unlock();
+
+ if(ts)
+ {
+ send_sig_info(SIG_DHT_IRQ, &info, ts); //send the signal
+ debug("Signal sent to PID %u with parameter 0x%X\n",pid,info.si_int);
+ }
+ else
+ {
+ debug("Process with PID %u is not found.\n",pid);
+ }
+ }
+ else
+ {
+ //just print results
+ if(type == DHT11)
+ {
+ const char* format="T:%d\tH:%d%%\n";
+ printk(format, data[2],data[0]);
+ }
+ else
+ {
+ const char* format="T:%d.%1d\tH:%d.%1d%%\n";
+ int t=((data[2] & 0x7f)*256+data[3]);
+ int h=data[0]*256+data[1];
+
+ if(data[2] & 0x80)
+ {
+ t=-t;
+ }
+
+ printk(format, t/10,t%10, h/10,h%10);
+ }
+ }
+ break;
+ }
+ }
+
+ if(pid != 0)
+ {
+ struct siginfo info;
+ struct task_struct* ts=NULL;
+
+ /* send the signal */
+ memset(&info, 0, sizeof(struct siginfo));
+ info.si_signo = SIG_DHT_IRQ;
+ info.si_code = SI_QUEUE; // this is bit of a trickery: SI_QUEUE is normally used by sigqueue from user space,
+ // and kernel space should use SI_KERNEL. But if SI_KERNEL is used the real_time data
+ // is not delivered to the user space signal handler function.
+
+ info.si_int = 0; // means 'error'
+
+ rcu_read_lock();
+ ts=pid_task(find_vpid(pid), PIDTYPE_PID);
+ rcu_read_unlock();
+
+ if(ts)
+ {
+ send_sig_info(SIG_DHT_IRQ, &info, ts); //send the signal
+ debug("Error sent to PID %u\n",pid);
+ }
+ else
+ {
+ debug("Error, but process with PID %u is not found.\n",pid);
+ }
+ }
+ else
+ {
+ printk(KERN_INFO "Error.\n");
+ }
+
+ break;
+ }
+
+ return count;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static const struct file_operations irq_fops = {
+// .read = show_handlers,
+ .write = run_command,
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int __init mymodule_init(void)
+{
+ gpio_addr = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
+ gpio_readdata_addr = gpio_addr + GPIO_OFFS_READ;
+ gpio_setdataout_addr = gpio_addr + GPIO_OFFS_SET;
+ gpio_cleardataout_addr = gpio_addr + GPIO_OFFS_CLEAR;
+
+ _ghandler.gpio=-1;
+ _ghandler.irq=-1;
+ _ghandler.counter=-1;
+
+ in_file=debugfs_create_file(FILE_NAME, 0666, NULL, NULL, &irq_fops);
+
+ printk(KERN_INFO "Waiting for commands in file /sys/kernel/debug/" FILE_NAME ".\n");
+
+ return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static void __exit mymodule_exit(void)
+{
+ free_handler();
+ debugfs_remove(in_file);
+ return;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+module_init(mymodule_init);
+module_exit(mymodule_exit);
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Unwired Devices");
+
+////////////////////////////////////////////////////////////////////////////////////////////
Index: package/kernel/gpio-irq-dht/Makefile
===================================================================
--- /dev/null
+++ package/kernel/gpio-irq-dht/Makefile
@@ -0,0 +1,45 @@
+#
+# Copyright (C) 2008-2012 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=gpio-irq-dht
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/gpio-irq-dht
+ SUBMENU:=Other modules
+ DEPENDS:=@!LINUX_3_3
+ TITLE:=GPIO IRQ DHT22 reader
+ FILES:=$(PKG_BUILD_DIR)/gpio-irq-dht.ko
+ AUTOLOAD:=$(call AutoLoad,30,gpio-irq-dht,1)
+ KCONFIG:=
+endef
+
+define KernelPackage/gpio-irq-dht/description
+ This is a DHT22 sensor kernel module for AR9331 devices.
+endef
+
+MAKE_OPTS:= \
+ ARCH="$(LINUX_KARCH)" \
+ CROSS_COMPILE="$(TARGET_CROSS)" \
+ SUBDIRS="$(PKG_BUILD_DIR)"
+
+define Build/Prepare
+ mkdir -p $(PKG_BUILD_DIR)
+ $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+ $(MAKE) -C "$(LINUX_DIR)" \
+ $(MAKE_OPTS) \
+ modules
+endef
+
+$(eval $(call KernelPackage,gpio-irq-dht))
Index: package/kernel/gpio-irq-dht/src/gpio-irq-dht.c
===================================================================
--- /dev/null
+++ package/kernel/gpio-irq-dht/src/gpio-irq-dht.c
@@ -0,0 +1,750 @@
+/*
+ * GPIO IRQ DHT sensor module for AR9331
+ *
+ * Copyright (C) 2015 Dmitriy Zherebkov <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/irq.h>
+
+#include <asm/delay.h>
+#include <asm/siginfo.h>
+
+#include <linux/rcupdate.h>
+#include <linux/sched.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+//#define DEBUG_OUT
+
+#ifdef DEBUG_OUT
+#define debug(fmt,args...) printk (KERN_INFO fmt ,##args)
+#else
+#define debug(fmt,args...)
+#endif /* DEBUG_OUT */
+
+//#define SIG_TIMER_IRQ (SIGRTMIN+12) // SIGRTMIN is different in Kernel and User modes
+#define SIG_DHT_IRQ 44 // So we have to hardcode this value
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define DRV_NAME "GPIO IRQ DHT"
+#define FILE_NAME "irq-dht"
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static unsigned int _timer_frequency=200000000;
+static spinlock_t _lock;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define ATH79_TIMER0_IRQ ATH79_MISC_IRQ(0)
+#define AR71XX_TIMER0_VALUE 0x00
+#define AR71XX_TIMER0_RELOAD 0x04
+
+#define ATH79_TIMER1_IRQ ATH79_MISC_IRQ(8)
+#define AR71XX_TIMER1_VALUE 0x94
+#define AR71XX_TIMER1_RELOAD 0x98
+
+#define ATH79_TIMER2_IRQ ATH79_MISC_IRQ(9)
+#define AR71XX_TIMER2_VALUE 0x9C
+#define AR71XX_TIMER2_RELOAD 0xA0
+
+#define ATH79_TIMER3_IRQ ATH79_MISC_IRQ(10)
+#define AR71XX_TIMER3_VALUE 0xA4
+#define AR71XX_TIMER3_RELOAD 0xA8
+
+static struct _timer_desc_struct
+{
+ unsigned int irq;
+ unsigned int value_reg;
+ unsigned int reload_reg;
+} _timers[4]=
+{
+ { ATH79_TIMER0_IRQ, AR71XX_TIMER0_VALUE, AR71XX_TIMER0_RELOAD },
+ { ATH79_TIMER1_IRQ, AR71XX_TIMER1_VALUE, AR71XX_TIMER1_RELOAD },
+ { ATH79_TIMER2_IRQ, AR71XX_TIMER2_VALUE, AR71XX_TIMER2_RELOAD },
+ { ATH79_TIMER3_IRQ, AR71XX_TIMER3_VALUE, AR71XX_TIMER3_RELOAD }
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define GPIO_OFFS_READ 0x04
+#define GPIO_OFFS_SET 0x0C
+#define GPIO_OFFS_CLEAR 0x10
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+void __iomem *ath79_timer_base=NULL;
+
+void __iomem *gpio_addr=NULL;
+void __iomem *gpio_readdata_addr=NULL;
+void __iomem *gpio_setdataout_addr=NULL;
+void __iomem *gpio_cleardataout_addr=NULL;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+#define DHT11 11
+#define DHT22 22
+
+////////////////////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+ int timer;
+ int irq;
+ unsigned int timeout; // always microseconds
+} _timer_handler;
+
+static _timer_handler _thandler;
+
+#define _max_ticks 200
+
+typedef struct
+{
+ unsigned int timeout;
+ int value;
+} _gpio_tick;
+
+typedef struct
+{
+ int gpio;
+ int irq;
+ int last_value;
+
+ unsigned int last_time;
+
+ int counter;
+ _gpio_tick ticks[_max_ticks];
+} _gpio_handler;
+
+static _gpio_handler _ghandler;
+
+static struct dentry* in_file;
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int is_space(char symbol)
+{
+ return (symbol == ' ') || (symbol == '\t');
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int is_digit(char symbol)
+{
+ return (symbol >= '0') && (symbol <= '9');
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static irqreturn_t timer_interrupt(int irq, void* dev_id)
+{
+ // do nothing
+ return (IRQ_HANDLED);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static irqreturn_t gpio_edge_interrupt(int irq, void* dev_id)
+{
+ _gpio_handler* handler=(_gpio_handler*)dev_id;
+
+ if(handler && (handler->irq == irq))
+ {
+ int val=0;
+ unsigned int cur_time=0;
+
+// debug("Got _handler!\n");
+
+ val=(__raw_readl(gpio_addr + GPIO_OFFS_READ) >> handler->gpio) & 1;
+
+ cur_time=__raw_readl(ath79_timer_base + _timers[_thandler.timer].value_reg)/(_timer_frequency/1000000);
+
+ if(val != handler->last_value)
+ {
+ handler->last_value=val;
+
+ if(handler->counter == -1)
+ {
+ handler->last_time=cur_time;
+ handler->counter=0;
+ }
+ else
+ {
+ if(handler->counter < _max_ticks)
+ {
+ unsigned int timeout=handler->last_time-cur_time;
+
+ handler->last_time=cur_time;
+
+ handler->ticks[handler->counter].timeout=timeout;
+ handler->ticks[handler->counter++].value=!val;
+ }
+ else
+ {
+// stop();
+// free_handler();
+ }
+ }
+ }
+ }
+ else
+ {
+ debug("IRQ %d event - no handlers found!\n",irq);
+ }
+
+ return (IRQ_HANDLED);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int add_irq(int gpio,void* data)
+{
+ if(gpio_request(gpio, DRV_NAME) >= 0)
+ {
+ int irq_number=gpio_to_irq(gpio);
+
+ if(irq_number >= 0)
+ {
+ int err = request_irq(irq_number, gpio_edge_interrupt, IRQ_TYPE_EDGE_BOTH, "gpio_irq_handler", data);
+
+ if(!err)
+ {
+ debug("Got IRQ %d for GPIO %d\n", irq_number, gpio);
+ return irq_number;
+ }
+ else
+ {
+ debug("GPIO IRQ handler: trouble requesting IRQ %d error %d\n",irq_number, err);
+ }
+ }
+ else
+ {
+ debug("Can't map GPIO %d to IRQ : error %d\n",gpio, irq_number);
+ }
+ }
+ else
+ {
+ debug("Can't get GPIO %d\n", gpio);
+ }
+
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static void free_handler(void)
+{
+ _gpio_handler* handler=&_ghandler;
+
+ if(handler->gpio > 0)
+ {
+ if(handler->irq >= 0)
+ {
+ free_irq(handler->irq, (void*)handler);
+ handler->irq=-1;
+ }
+
+ gpio_free(handler->gpio);
+ handler->gpio=-1;
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int add_handler(int gpio)
+{
+ _gpio_handler* handler=&_ghandler;
+
+ if(handler->gpio != gpio)
+ {
+ int irq=add_irq(gpio, handler);
+
+ if(irq < 0)
+ {
+ free_handler();
+ return -1;
+ }
+
+ handler->gpio=gpio;
+ handler->irq=irq;
+ handler->last_value=-1;
+
+ return 0;
+ }
+
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int add_timer_irq(int timer, void* data)
+{
+ int err=0;
+ int irq_number=_timers[timer].irq;
+
+ debug("Adding IRQ %d handler\n",irq_number);
+
+ err=request_irq(irq_number, timer_interrupt, 0, DRV_NAME, data);
+
+ if(!err)
+ {
+ debug("Got IRQ %d.\n", irq_number);
+ return irq_number;
+ }
+ else
+ {
+ debug("Timer IRQ handler: trouble requesting IRQ %d error %d\n",irq_number, err);
+ }
+
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static void clear_timer(_timer_handler* handler)
+{
+ handler->timer=-1;
+ handler->irq=-1;
+ handler->timeout=0;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static void stop(void)
+{
+ unsigned long flags=0;
+
+ _timer_handler* handler=&_thandler;
+
+ spin_lock_irqsave(&_lock,flags);
+
+ if(handler->irq >= 0)
+ {
+ free_irq(handler->irq, (void*)handler);
+ clear_timer(handler);
+
+ debug("Timer stopped.\n");
+ }
+
+ spin_unlock_irqrestore(&_lock,flags);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static int start(int timer,unsigned int timeout)
+{
+ int irq=-1;
+ unsigned long flags=0;
+
+ _timer_handler* handler=&_thandler;
+
+ stop();
+
+ spin_lock_irqsave(&_lock,flags);
+ // need some time (10 ms) before first IRQ - even after "lock"?!
+ __raw_writel(_timer_frequency, ath79_timer_base+_timers[timer].reload_reg);
+
+ irq=add_timer_irq(timer,handler);
+
+ if(irq >= 0)
+ {
+ unsigned int real_timeout=_timer_frequency/1000000*timeout;
+
+/* int scale=0;
+
+ scale=timeout/100;
+ if(scale >= 2)
+ {
+ real_timeout/=100;
+ handler->ticks_in_timeout=scale;
+ }
+*/
+ handler->timer=timer;
+ handler->irq=irq;
+ handler->timeout=timeout;
+
+ __raw_writel(real_timeout, ath79_timer_base+_timers[timer].reload_reg);
+
+ debug("Timer #%d started with %u us interval.\n", timer, timeout);
+
+ spin_unlock_irqrestore(&_lock,flags);
+ return 0;
+ }
+
+ spin_unlock_irqrestore(&_lock,flags);
+
+ stop();
+ return -1;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+
+static ssize_t run_command(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char buffer[512];
+ char line[20];
+ char* in_pos=NULL;
+ char* end=NULL;
+ char* out_pos=NULL;
+
+ int timer=-1;
+ int gpio=-1;
+ pid_t pid=0;
+
+ if(count > 512)
+ return -EINVAL; // file is too big
+
+ copy_from_user(buffer, buf, count);
+ buffer[count]=0;
+
+ debug("Command is found (%u bytes length):\n%s\n",count,buffer);
+
+ in_pos=buffer;
+ end=in_pos+count-1;
+
+ while(in_pos < end)
+ {
+ timer=0;