[PARISC] Convert soft power switch driver to kthread (6e16d940) · Commits · EulixOS / Software / Kernel

arch/parisc/kernel/time.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -148,10 +148,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
		write_sequnlock(&xtime_lock);
		}

		/* check soft power switch status */
		if (cpu == 0 && !atomic_read(&power_tasklet.count))
		tasklet_schedule(&power_tasklet);

		return IRQ_HANDLED;
		}

drivers/parisc/led.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -631,7 +631,7 @@ void __init register_led_regions(void)
		** avoid a race condition while writing the CMD/DATA register pair.
		**
		*/
		int lcd_print( char *str )
		int lcd_print( const char *str )
		{
		int i;

drivers/parisc/power.c

+89 −112

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@
		* linux/drivers/parisc/power.c
		* HP PARISC soft power switch support driver
		*
		* Copyright (c) 2001-2005 Helge Deller <deller@gmx.de>
		* Copyright (c) 2001-2007 Helge Deller <deller@gmx.de>
		* All rights reserved.
		*
		*
		@@ -29,7 +29,6 @@
		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
		*
		*
		*
		* HINT:
		* Support of the soft power switch button may be enabled or disabled at
		* runtime through the "/proc/sys/kernel/power" procfs entry.
		@@ -38,34 +37,28 @@
		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/string.h>
		#include <linux/notifier.h>
		#include <linux/reboot.h>
		#include <linux/sched.h>
		#include <linux/interrupt.h>
		#include <linux/workqueue.h>
		#include <linux/kthread.h>

		#include <asm/pdc.h>
		#include <asm/io.h>
		#include <asm/led.h>
		#include <asm/uaccess.h>


		#ifdef DEBUG
		# define DPRINTK(x...) printk(x)
		#else
		# define DPRINTK(x...)
		#endif
		#define DRIVER_NAME "powersw"
		#define KTHREAD_NAME "kpowerswd"

		/* how often should the power button be polled ? */
		#define POWERSWITCH_POLL_PER_SEC 2

		/* filename in /proc which can be used to enable/disable the power switch */
		#define SYSCTL_FILENAME "sys/kernel/power"

		/* how long does the power button needs to be down until we react ? */
		#define POWERSWITCH_DOWN_SEC 2

		/* assembly code to access special registers */
		/* taken from PCXL ERS page 82 */
		#define DIAG_CODE(code) (0x14000000 + ((code)<<5))

		/* this will go to processor.h or any other place... */
		/* taken from PCXL ERS page 82 */
		#define MFCPU_X(rDiagReg, t_ch, t_th, code) \
		(DIAG_CODE(code) + ((rDiagReg)<<21) + ((t_ch)<<16) + ((t_th)<<0) )

		@@ -76,111 +69,95 @@
		#define __getDIAG(dr) ( { \
		register unsigned long __res asm("r28");\
		__asm__ __volatile__ ( \
		".word %1\n nop\n" : "=&r" (__res) : "i" (MFCPU_T(dr,28)) \
		".word %1" : "=&r" (__res) : "i" (MFCPU_T(dr,28) ) \
		); \
		__res; \
		} )


		static void deferred_poweroff(struct work_struct *unused)
		{
		if (kill_cad_pid(SIGINT, 1)) {
		/* just in case killing init process failed */
		machine_power_off();
		}
		}

		/*
		* This function gets called from interrupt context.
		* As it's called within an interrupt, it wouldn't sync if we don't
		* use schedule_work().
		*/

		static DECLARE_WORK(poweroff_work, deferred_poweroff);

		static void poweroff(void)
		{
		static int powering_off __read_mostly;

		if (powering_off)
		return;

		powering_off++;
		schedule_work(&poweroff_work);
		}


		/* local time-counter for shutdown */
		/* local shutdown counter */
		static int shutdown_timer __read_mostly;

		/* check, give feedback and start shutdown after one second */
		static void process_shutdown(void)
		{
		if (shutdown_timer == 0)
		DPRINTK(KERN_INFO "Shutdown requested...\n");
		printk(KERN_ALERT KTHREAD_NAME ": Shutdown requested...\n");

		shutdown_timer++;

		/* wait until the button was pressed for 1 second */
		if (shutdown_timer == HZ) {
		#if defined (DEBUG) \|\| defined(CONFIG_CHASSIS_LCD_LED)
		static char msg[] = "Shutting down...";
		#endif
		DPRINTK(KERN_INFO "%s\n", msg);
		if (shutdown_timer == (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC)) {
		static const char msg[] = "Shutting down...";
		printk(KERN_INFO KTHREAD_NAME ": %s\n", msg);
		lcd_print(msg);
		poweroff();

		/* send kill signal */
		if (kill_cad_pid(SIGINT, 1)) {
		/* just in case killing init process failed */
		if (pm_power_off)
		pm_power_off();
		}
		}
		}


		/* main power switch tasklet struct (scheduled from time.c) */
		DECLARE_TASKLET_DISABLED(power_tasklet, NULL, 0);
		/* main power switch task struct */
		static struct task_struct *power_task;

		/* filename in /proc which can be used to enable/disable the power switch */
		#define SYSCTL_FILENAME "sys/kernel/power"

		/* soft power switch enabled/disabled */
		int pwrsw_enabled __read_mostly = 1;

		/*
		* On gecko style machines (e.g. 712/xx and 715/xx)
		* the power switch status is stored in Bit 0 ("the highest bit")
		* of CPU diagnose register 25.
		*
		*/
		static void gecko_tasklet_func(unsigned long unused)
		/* main kernel thread worker. It polls the button state */
		static int kpowerswd(void *param)
		{
		if (unlikely(!pwrsw_enabled))
		return;
		__set_current_state(TASK_RUNNING);

		if (__getDIAG(25) & 0x80000000) {
		/* power switch button not pressed or released again */
		/* Warning: Some machines do never reset this DIAG flag! */
		shutdown_timer = 0;
		} else {
		process_shutdown();
		}
		}
		do {
		int button_not_pressed;
		unsigned long soft_power_reg = (unsigned long) param;

		schedule_timeout_interruptible(pwrsw_enabled ? HZ : HZ/POWERSWITCH_POLL_PER_SEC);
		__set_current_state(TASK_RUNNING);

		if (unlikely(!pwrsw_enabled))
		continue;

		if (soft_power_reg) {
		/*
		* Non-Gecko-style machines:
		* Check the power switch status which is read from the
		* real I/O location at soft_power_reg.
		* Bit 31 ("the lowest bit) is the status of the power switch.
		* This bit is "1" if the button is NOT pressed.
		*/
		button_not_pressed = (gsc_readl(soft_power_reg) & 0x1);
		} else {
		/*
		* On gecko style machines (e.g. 712/xx and 715/xx)
		* the power switch status is stored in Bit 0 ("the highest bit")
		* of CPU diagnose register 25.
		* Warning: Some machines never reset the DIAG flag, even if
		* the button has been released again.
		*/
		button_not_pressed = (__getDIAG(25) & 0x80000000);
		}

		static void polling_tasklet_func(unsigned long soft_power_reg)
		{
		unsigned long current_status;

		if (unlikely(!pwrsw_enabled))
		return;

		current_status = gsc_readl(soft_power_reg);
		if (current_status & 0x1) {
		/* power switch button not pressed */
		if (likely(button_not_pressed)) {
		if (unlikely(shutdown_timer && /* avoid writing if not necessary */
		shutdown_timer < (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC))) {
		shutdown_timer = 0;
		} else {
		process_shutdown();
		printk(KERN_INFO KTHREAD_NAME ": Shutdown request aborted.\n");
		}
		} else
		process_shutdown();


		} while (!kthread_should_stop());

		return 0;
		}


		@@ -220,7 +197,7 @@ static struct notifier_block parisc_panic_block = {
		static int __init power_init(void)
		{
		unsigned long ret;
		unsigned long soft_power_reg = 0;
		unsigned long soft_power_reg;

		#if 0
		request_irq( IRQ_FROM_REGION(CPU_IRQ_REGION)+2, &powerfail_interrupt,
		@@ -235,44 +212,44 @@ static int __init power_init(void)
		soft_power_reg = -1UL;

		switch (soft_power_reg) {
		case 0: printk(KERN_INFO "Gecko-style soft power switch enabled.\n");
		power_tasklet.func = gecko_tasklet_func;
		case 0: printk(KERN_INFO DRIVER_NAME ": Gecko-style soft power switch enabled.\n");
		break;

		case -1UL: printk(KERN_INFO "Soft power switch support not available.\n");
		case -1UL: printk(KERN_INFO DRIVER_NAME ": Soft power switch support not available.\n");
		return -ENODEV;

		default: printk(KERN_INFO "Soft power switch enabled, polling @ 0x%08lx.\n",
		default: printk(KERN_INFO DRIVER_NAME ": Soft power switch at 0x%08lx enabled.\n",
		soft_power_reg);
		power_tasklet.data = soft_power_reg;
		power_tasklet.func = polling_tasklet_func;
		}

		power_task = kthread_run(kpowerswd, (void*)soft_power_reg, KTHREAD_NAME);
		if (IS_ERR(power_task)) {
		printk(KERN_ERR DRIVER_NAME ": thread creation failed. Driver not loaded.\n");
		pdc_soft_power_button(0);
		return -EIO;
		}

		/* Register a call for panic conditions. */
		atomic_notifier_chain_register(&panic_notifier_list,
		&parisc_panic_block);

		tasklet_enable(&power_tasklet);

		return 0;
		}

		static void __exit power_exit(void)
		{
		if (!power_tasklet.func)
		return;
		kthread_stop(power_task);

		tasklet_disable(&power_tasklet);
		atomic_notifier_chain_unregister(&panic_notifier_list,
		&parisc_panic_block);
		power_tasklet.func = NULL;

		pdc_soft_power_button(0);
		}

		module_init(power_init);
		arch_initcall(power_init);
		module_exit(power_exit);


		MODULE_AUTHOR("Helge Deller");
		MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
		MODULE_DESCRIPTION("Soft power switch driver");
		MODULE_LICENSE("Dual BSD/GPL");

include/asm-parisc/led.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -31,7 +31,7 @@ void __init register_led_regions(void);

		#ifdef CONFIG_CHASSIS_LCD_LED
		/* writes a string to the LCD display (if possible on this h/w) */
		int lcd_print(char *str);
		int lcd_print(const char *str);
		#else
		#define lcd_print(str)
		#endif