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[PARISC] Convert soft power switch driver to kthread
And remove it's reference in time.c. Allow lcd_print() to take a const char *. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Helge Deller
Kyle McMartin
parent
324c7e6545
commit
6e16d9409e
@ -148,10 +148,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
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write_sequnlock(&xtime_lock);
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}
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/* check soft power switch status */
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if (cpu == 0 && !atomic_read(&power_tasklet.count))
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tasklet_schedule(&power_tasklet);
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return IRQ_HANDLED;
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}
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@ -631,7 +631,7 @@ void __init register_led_regions(void)
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** avoid a race condition while writing the CMD/DATA register pair.
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**
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*/
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int lcd_print( char *str )
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int lcd_print( const char *str )
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{
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int i;
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@ -2,7 +2,7 @@
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* linux/drivers/parisc/power.c
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* HP PARISC soft power switch support driver
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*
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* Copyright (c) 2001-2005 Helge Deller <deller@gmx.de>
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* Copyright (c) 2001-2007 Helge Deller <deller@gmx.de>
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* All rights reserved.
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*
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*
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@ -29,7 +29,6 @@
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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*
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*
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*
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* HINT:
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* Support of the soft power switch button may be enabled or disabled at
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* runtime through the "/proc/sys/kernel/power" procfs entry.
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@ -38,34 +37,28 @@
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <asm/pdc.h>
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#include <asm/io.h>
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#include <asm/led.h>
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#include <asm/uaccess.h>
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#define DRIVER_NAME "powersw"
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#define KTHREAD_NAME "kpowerswd"
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#ifdef DEBUG
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# define DPRINTK(x...) printk(x)
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#else
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# define DPRINTK(x...)
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#endif
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/* filename in /proc which can be used to enable/disable the power switch */
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#define SYSCTL_FILENAME "sys/kernel/power"
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/* how often should the power button be polled ? */
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#define POWERSWITCH_POLL_PER_SEC 2
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/* how long does the power button needs to be down until we react ? */
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#define POWERSWITCH_DOWN_SEC 2
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/* assembly code to access special registers */
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/* taken from PCXL ERS page 82 */
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#define DIAG_CODE(code) (0x14000000 + ((code)<<5))
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/* this will go to processor.h or any other place... */
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/* taken from PCXL ERS page 82 */
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#define MFCPU_X(rDiagReg, t_ch, t_th, code) \
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(DIAG_CODE(code) + ((rDiagReg)<<21) + ((t_ch)<<16) + ((t_th)<<0) )
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@ -76,111 +69,95 @@
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#define __getDIAG(dr) ( { \
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register unsigned long __res asm("r28");\
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__asm__ __volatile__ ( \
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".word %1\n nop\n" : "=&r" (__res) : "i" (MFCPU_T(dr,28)) \
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".word %1" : "=&r" (__res) : "i" (MFCPU_T(dr,28) ) \
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); \
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__res; \
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} )
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static void deferred_poweroff(struct work_struct *unused)
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{
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if (kill_cad_pid(SIGINT, 1)) {
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/* just in case killing init process failed */
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machine_power_off();
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}
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}
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/*
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* This function gets called from interrupt context.
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* As it's called within an interrupt, it wouldn't sync if we don't
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* use schedule_work().
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*/
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static DECLARE_WORK(poweroff_work, deferred_poweroff);
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static void poweroff(void)
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{
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static int powering_off __read_mostly;
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if (powering_off)
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return;
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powering_off++;
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schedule_work(&poweroff_work);
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}
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/* local time-counter for shutdown */
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/* local shutdown counter */
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static int shutdown_timer __read_mostly;
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/* check, give feedback and start shutdown after one second */
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static void process_shutdown(void)
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{
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if (shutdown_timer == 0)
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DPRINTK(KERN_INFO "Shutdown requested...\n");
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printk(KERN_ALERT KTHREAD_NAME ": Shutdown requested...\n");
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shutdown_timer++;
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/* wait until the button was pressed for 1 second */
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if (shutdown_timer == HZ) {
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#if defined (DEBUG) || defined(CONFIG_CHASSIS_LCD_LED)
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static char msg[] = "Shutting down...";
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#endif
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DPRINTK(KERN_INFO "%s\n", msg);
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if (shutdown_timer == (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC)) {
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static const char msg[] = "Shutting down...";
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printk(KERN_INFO KTHREAD_NAME ": %s\n", msg);
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lcd_print(msg);
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poweroff();
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/* send kill signal */
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if (kill_cad_pid(SIGINT, 1)) {
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/* just in case killing init process failed */
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if (pm_power_off)
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pm_power_off();
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}
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}
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}
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/* main power switch tasklet struct (scheduled from time.c) */
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DECLARE_TASKLET_DISABLED(power_tasklet, NULL, 0);
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/* main power switch task struct */
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static struct task_struct *power_task;
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/* filename in /proc which can be used to enable/disable the power switch */
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#define SYSCTL_FILENAME "sys/kernel/power"
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/* soft power switch enabled/disabled */
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int pwrsw_enabled __read_mostly = 1;
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/*
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* On gecko style machines (e.g. 712/xx and 715/xx)
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* the power switch status is stored in Bit 0 ("the highest bit")
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* of CPU diagnose register 25.
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*
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*/
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static void gecko_tasklet_func(unsigned long unused)
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/* main kernel thread worker. It polls the button state */
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static int kpowerswd(void *param)
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{
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if (unlikely(!pwrsw_enabled))
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return;
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__set_current_state(TASK_RUNNING);
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if (__getDIAG(25) & 0x80000000) {
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/* power switch button not pressed or released again */
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/* Warning: Some machines do never reset this DIAG flag! */
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shutdown_timer = 0;
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} else {
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process_shutdown();
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}
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}
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do {
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int button_not_pressed;
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unsigned long soft_power_reg = (unsigned long) param;
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schedule_timeout_interruptible(pwrsw_enabled ? HZ : HZ/POWERSWITCH_POLL_PER_SEC);
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__set_current_state(TASK_RUNNING);
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if (unlikely(!pwrsw_enabled))
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continue;
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if (soft_power_reg) {
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/*
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* Non-Gecko-style machines:
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* Check the power switch status which is read from the
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* real I/O location at soft_power_reg.
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* Bit 31 ("the lowest bit) is the status of the power switch.
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* This bit is "1" if the button is NOT pressed.
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*/
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button_not_pressed = (gsc_readl(soft_power_reg) & 0x1);
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} else {
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/*
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* On gecko style machines (e.g. 712/xx and 715/xx)
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* the power switch status is stored in Bit 0 ("the highest bit")
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* of CPU diagnose register 25.
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* Warning: Some machines never reset the DIAG flag, even if
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* the button has been released again.
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*/
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button_not_pressed = (__getDIAG(25) & 0x80000000);
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}
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if (likely(button_not_pressed)) {
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if (unlikely(shutdown_timer && /* avoid writing if not necessary */
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shutdown_timer < (POWERSWITCH_DOWN_SEC*POWERSWITCH_POLL_PER_SEC))) {
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shutdown_timer = 0;
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printk(KERN_INFO KTHREAD_NAME ": Shutdown request aborted.\n");
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}
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} else
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process_shutdown();
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} while (!kthread_should_stop());
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/*
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* Check the power switch status which is read from the
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* real I/O location at soft_power_reg.
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* Bit 31 ("the lowest bit) is the status of the power switch.
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*/
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static void polling_tasklet_func(unsigned long soft_power_reg)
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{
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unsigned long current_status;
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if (unlikely(!pwrsw_enabled))
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return;
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current_status = gsc_readl(soft_power_reg);
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if (current_status & 0x1) {
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/* power switch button not pressed */
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shutdown_timer = 0;
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} else {
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process_shutdown();
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}
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return 0;
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}
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@ -220,7 +197,7 @@ static struct notifier_block parisc_panic_block = {
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static int __init power_init(void)
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{
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unsigned long ret;
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unsigned long soft_power_reg = 0;
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unsigned long soft_power_reg;
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#if 0
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request_irq( IRQ_FROM_REGION(CPU_IRQ_REGION)+2, &powerfail_interrupt,
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@ -235,44 +212,44 @@ static int __init power_init(void)
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soft_power_reg = -1UL;
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switch (soft_power_reg) {
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case 0: printk(KERN_INFO "Gecko-style soft power switch enabled.\n");
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power_tasklet.func = gecko_tasklet_func;
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case 0: printk(KERN_INFO DRIVER_NAME ": Gecko-style soft power switch enabled.\n");
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break;
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case -1UL: printk(KERN_INFO "Soft power switch support not available.\n");
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case -1UL: printk(KERN_INFO DRIVER_NAME ": Soft power switch support not available.\n");
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return -ENODEV;
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default: printk(KERN_INFO "Soft power switch enabled, polling @ 0x%08lx.\n",
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default: printk(KERN_INFO DRIVER_NAME ": Soft power switch at 0x%08lx enabled.\n",
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soft_power_reg);
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power_tasklet.data = soft_power_reg;
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power_tasklet.func = polling_tasklet_func;
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}
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power_task = kthread_run(kpowerswd, (void*)soft_power_reg, KTHREAD_NAME);
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if (IS_ERR(power_task)) {
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printk(KERN_ERR DRIVER_NAME ": thread creation failed. Driver not loaded.\n");
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pdc_soft_power_button(0);
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return -EIO;
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}
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/* Register a call for panic conditions. */
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atomic_notifier_chain_register(&panic_notifier_list,
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&parisc_panic_block);
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tasklet_enable(&power_tasklet);
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return 0;
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}
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static void __exit power_exit(void)
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{
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if (!power_tasklet.func)
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return;
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kthread_stop(power_task);
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tasklet_disable(&power_tasklet);
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&parisc_panic_block);
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power_tasklet.func = NULL;
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pdc_soft_power_button(0);
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}
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module_init(power_init);
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arch_initcall(power_init);
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module_exit(power_exit);
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MODULE_AUTHOR("Helge Deller");
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MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
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MODULE_DESCRIPTION("Soft power switch driver");
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MODULE_LICENSE("Dual BSD/GPL");
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@ -31,7 +31,7 @@ void __init register_led_regions(void);
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#ifdef CONFIG_CHASSIS_LCD_LED
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/* writes a string to the LCD display (if possible on this h/w) */
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int lcd_print(char *str);
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int lcd_print(const char *str);
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#else
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#define lcd_print(str)
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#endif
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