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@@ -1,538 +0,0 @@
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-/*
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- * bios-less APM driver for hp680
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- *
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- * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
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- *
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- * based on ARM APM driver by
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- * Jamey Hicks <jamey@crl.dec.com>
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- *
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- * adapted from the APM BIOS driver for Linux by
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- * Stephen Rothwell (sfr@linuxcare.com)
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- *
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- * APM 1.2 Reference:
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- * Intel Corporation, Microsoft Corporation. Advanced Power Management
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- * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
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- *
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- * [This document is available from Microsoft at:
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- * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
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- */
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-#include <linux/module.h>
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-#include <linux/poll.h>
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-#include <linux/timer.h>
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-#include <linux/slab.h>
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-#include <linux/proc_fs.h>
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-#include <linux/miscdevice.h>
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-#include <linux/apm_bios.h>
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-#include <linux/pm.h>
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-#include <linux/pm_legacy.h>
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-#include <asm/apm.h>
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-
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-#define MODNAME "apm"
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-
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-/*
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- * The apm_bios device is one of the misc char devices.
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- * This is its minor number.
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- */
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-#define APM_MINOR_DEV 134
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-
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-/*
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- * Maximum number of events stored
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- */
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-#define APM_MAX_EVENTS 16
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-
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-struct apm_queue {
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- unsigned int event_head;
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- unsigned int event_tail;
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- apm_event_t events[APM_MAX_EVENTS];
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-};
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-
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-/*
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- * The per-file APM data
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- */
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-struct apm_user {
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- struct list_head list;
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-
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- unsigned int suser: 1;
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- unsigned int writer: 1;
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- unsigned int reader: 1;
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-
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- int suspend_result;
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- unsigned int suspend_state;
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-#define SUSPEND_NONE 0 /* no suspend pending */
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-#define SUSPEND_PENDING 1 /* suspend pending read */
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-#define SUSPEND_READ 2 /* suspend read, pending ack */
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-#define SUSPEND_ACKED 3 /* suspend acked */
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-#define SUSPEND_DONE 4 /* suspend completed */
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-
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- struct apm_queue queue;
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-};
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-
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-/*
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- * Local variables
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- */
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-static int suspends_pending;
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-
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-static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
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-static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
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-
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-/*
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- * This is a list of everyone who has opened /dev/apm_bios
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- */
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-static DECLARE_RWSEM(user_list_lock);
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-static LIST_HEAD(apm_user_list);
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-
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-/*
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- * kapmd info. kapmd provides us a process context to handle
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- * "APM" events within - specifically necessary if we're going
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- * to be suspending the system.
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- */
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-static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);
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-static DECLARE_COMPLETION(kapmd_exit);
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-static DEFINE_SPINLOCK(kapmd_queue_lock);
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-static struct apm_queue kapmd_queue;
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-
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-int apm_suspended;
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-EXPORT_SYMBOL(apm_suspended);
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-
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-/* Platform-specific apm_read_proc(). */
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-int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);
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-EXPORT_SYMBOL(apm_get_info);
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-
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-/*
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- * APM event queue management.
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- */
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-static inline int queue_empty(struct apm_queue *q)
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-{
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- return q->event_head == q->event_tail;
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-}
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-
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-static inline apm_event_t queue_get_event(struct apm_queue *q)
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-{
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- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
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- return q->events[q->event_tail];
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-}
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-
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-static void queue_add_event(struct apm_queue *q, apm_event_t event)
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-{
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- q->event_head = (q->event_head + 1) % APM_MAX_EVENTS;
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- if (q->event_head == q->event_tail) {
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- static int notified;
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-
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- if (notified++ == 0)
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- printk(KERN_ERR "apm: an event queue overflowed\n");
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-
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- q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;
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- }
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- q->events[q->event_head] = event;
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-}
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-
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-static void queue_event_one_user(struct apm_user *as, apm_event_t event)
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-{
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- if (as->suser && as->writer) {
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- switch (event) {
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- case APM_SYS_SUSPEND:
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- case APM_USER_SUSPEND:
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- /*
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- * If this user already has a suspend pending,
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- * don't queue another one.
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- */
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- if (as->suspend_state != SUSPEND_NONE)
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- return;
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-
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- as->suspend_state = SUSPEND_PENDING;
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- suspends_pending++;
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- break;
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- }
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- }
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- queue_add_event(&as->queue, event);
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-}
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-
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-static void queue_event(apm_event_t event, struct apm_user *sender)
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-{
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- struct apm_user *as;
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-
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- down_read(&user_list_lock);
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-
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- list_for_each_entry(as, &apm_user_list, list)
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- if (as != sender && as->reader)
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- queue_event_one_user(as, event);
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-
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- up_read(&user_list_lock);
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- wake_up_interruptible(&apm_waitqueue);
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-}
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-
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-/**
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- * apm_queue_event - queue an APM event for kapmd
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- * @event: APM event
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- *
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- * Queue an APM event for kapmd to process and ultimately take the
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- * appropriate action. Only a subset of events are handled:
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- * %APM_LOW_BATTERY
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- * %APM_POWER_STATUS_CHANGE
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- * %APM_USER_SUSPEND
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- * %APM_SYS_SUSPEND
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- * %APM_CRITICAL_SUSPEND
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- */
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-void apm_queue_event(apm_event_t event)
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-{
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- spin_lock_irq(&kapmd_queue_lock);
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- queue_add_event(&kapmd_queue, event);
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- spin_unlock_irq(&kapmd_queue_lock);
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-
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- wake_up_interruptible(&kapmd_wait);
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-}
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-EXPORT_SYMBOL(apm_queue_event);
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-
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-static void apm_suspend(void)
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-{
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- struct apm_user *as;
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- int err;
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-
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- apm_suspended = 1;
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- err = pm_suspend(PM_SUSPEND_MEM);
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-
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- /*
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- * Anyone on the APM queues will think we're still suspended.
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- * Send a message so everyone knows we're now awake again.
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- */
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- queue_event(APM_NORMAL_RESUME, NULL);
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-
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- /*
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- * Finally, wake up anyone who is sleeping on the suspend.
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- */
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- down_read(&user_list_lock);
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- list_for_each_entry(as, &apm_user_list, list) {
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- as->suspend_result = err;
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- as->suspend_state = SUSPEND_DONE;
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- }
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- up_read(&user_list_lock);
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-
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- wake_up(&apm_suspend_waitqueue);
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- apm_suspended = 0;
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-}
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-
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-static ssize_t apm_read(struct file *fp, char __user *buf,
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- size_t count, loff_t *ppos)
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-{
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- struct apm_user *as = fp->private_data;
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- apm_event_t event;
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- int i = count, ret = 0;
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-
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- if (count < sizeof(apm_event_t))
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- return -EINVAL;
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-
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- if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
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- return -EAGAIN;
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-
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- wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
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-
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- while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {
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- event = queue_get_event(&as->queue);
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-
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- ret = -EFAULT;
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- if (copy_to_user(buf, &event, sizeof(event)))
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- break;
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-
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- if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)
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- as->suspend_state = SUSPEND_READ;
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-
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- buf += sizeof(event);
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- i -= sizeof(event);
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- }
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-
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- if (i < count)
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- ret = count - i;
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-
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- return ret;
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-}
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-
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-static unsigned int apm_poll(struct file *fp, poll_table * wait)
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-{
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- struct apm_user *as = fp->private_data;
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-
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- poll_wait(fp, &apm_waitqueue, wait);
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- return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM;
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-}
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-
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-/*
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- * apm_ioctl - handle APM ioctl
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- *
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- * APM_IOC_SUSPEND
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- * This IOCTL is overloaded, and performs two functions. It is used to:
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- * - initiate a suspend
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- * - acknowledge a suspend read from /dev/apm_bios.
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- * Only when everyone who has opened /dev/apm_bios with write permission
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- * has acknowledge does the actual suspend happen.
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- */
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-static int
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-apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
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-{
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- struct apm_user *as = filp->private_data;
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- unsigned long flags;
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- int err = -EINVAL;
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-
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- if (!as->suser || !as->writer)
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- return -EPERM;
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-
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- switch (cmd) {
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- case APM_IOC_SUSPEND:
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- as->suspend_result = -EINTR;
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-
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- if (as->suspend_state == SUSPEND_READ) {
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- /*
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- * If we read a suspend command from /dev/apm_bios,
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- * then the corresponding APM_IOC_SUSPEND ioctl is
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- * interpreted as an acknowledge.
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- */
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- as->suspend_state = SUSPEND_ACKED;
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- suspends_pending--;
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- } else {
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- /*
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- * Otherwise it is a request to suspend the system.
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- * Queue an event for all readers, and expect an
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- * acknowledge from all writers who haven't already
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- * acknowledged.
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- */
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- queue_event(APM_USER_SUSPEND, as);
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- }
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-
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- /*
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- * If there are no further acknowledges required, suspend
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- * the system.
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- */
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- if (suspends_pending == 0)
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- apm_suspend();
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-
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- /*
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- * Wait for the suspend/resume to complete. If there are
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- * pending acknowledges, we wait here for them.
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- *
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- * Note that we need to ensure that the PM subsystem does
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- * not kick us out of the wait when it suspends the threads.
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- */
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- flags = current->flags;
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- current->flags |= PF_NOFREEZE;
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-
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- /*
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- * Note: do not allow a thread which is acking the suspend
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- * to escape until the resume is complete.
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- */
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- if (as->suspend_state == SUSPEND_ACKED)
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- wait_event(apm_suspend_waitqueue,
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- as->suspend_state == SUSPEND_DONE);
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- else
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- wait_event_interruptible(apm_suspend_waitqueue,
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- as->suspend_state == SUSPEND_DONE);
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-
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- current->flags = flags;
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- err = as->suspend_result;
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- as->suspend_state = SUSPEND_NONE;
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- break;
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- }
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-
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- return err;
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-}
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-
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-static int apm_release(struct inode * inode, struct file * filp)
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-{
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- struct apm_user *as = filp->private_data;
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- filp->private_data = NULL;
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-
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- down_write(&user_list_lock);
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- list_del(&as->list);
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- up_write(&user_list_lock);
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-
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- /*
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- * We are now unhooked from the chain. As far as new
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- * events are concerned, we no longer exist. However, we
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- * need to balance suspends_pending, which means the
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- * possibility of sleeping.
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- */
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- if (as->suspend_state != SUSPEND_NONE) {
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- suspends_pending -= 1;
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- if (suspends_pending == 0)
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- apm_suspend();
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- }
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-
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- kfree(as);
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- return 0;
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-}
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-
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-static int apm_open(struct inode * inode, struct file * filp)
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-{
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- struct apm_user *as;
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-
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- as = kzalloc(sizeof(*as), GFP_KERNEL);
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- if (as) {
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- /*
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- * XXX - this is a tiny bit broken, when we consider BSD
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- * process accounting. If the device is opened by root, we
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- * instantly flag that we used superuser privs. Who knows,
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- * we might close the device immediately without doing a
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- * privileged operation -- cevans
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- */
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- as->suser = capable(CAP_SYS_ADMIN);
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- as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
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- as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
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-
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- down_write(&user_list_lock);
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- list_add(&as->list, &apm_user_list);
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- up_write(&user_list_lock);
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-
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- filp->private_data = as;
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- }
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-
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- return as ? 0 : -ENOMEM;
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-}
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-
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-static struct file_operations apm_bios_fops = {
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- .owner = THIS_MODULE,
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- .read = apm_read,
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- .poll = apm_poll,
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- .ioctl = apm_ioctl,
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- .open = apm_open,
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- .release = apm_release,
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-};
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-
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-static struct miscdevice apm_device = {
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- .minor = APM_MINOR_DEV,
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- .name = "apm_bios",
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- .fops = &apm_bios_fops
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-};
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-
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-
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-#ifdef CONFIG_PROC_FS
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-/*
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- * Arguments, with symbols from linux/apm_bios.h.
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- *
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- * 0) Linux driver version (this will change if format changes)
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- * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
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- * 2) APM flags from APM Installation Check (0x00):
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- * bit 0: APM_16_BIT_SUPPORT
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- * bit 1: APM_32_BIT_SUPPORT
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- * bit 2: APM_IDLE_SLOWS_CLOCK
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- * bit 3: APM_BIOS_DISABLED
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- * bit 4: APM_BIOS_DISENGAGED
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- * 3) AC line status
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- * 0x00: Off-line
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- * 0x01: On-line
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- * 0x02: On backup power (BIOS >= 1.1 only)
|
|
|
- * 0xff: Unknown
|
|
|
- * 4) Battery status
|
|
|
- * 0x00: High
|
|
|
- * 0x01: Low
|
|
|
- * 0x02: Critical
|
|
|
- * 0x03: Charging
|
|
|
- * 0x04: Selected battery not present (BIOS >= 1.2 only)
|
|
|
- * 0xff: Unknown
|
|
|
- * 5) Battery flag
|
|
|
- * bit 0: High
|
|
|
- * bit 1: Low
|
|
|
- * bit 2: Critical
|
|
|
- * bit 3: Charging
|
|
|
- * bit 7: No system battery
|
|
|
- * 0xff: Unknown
|
|
|
- * 6) Remaining battery life (percentage of charge):
|
|
|
- * 0-100: valid
|
|
|
- * -1: Unknown
|
|
|
- * 7) Remaining battery life (time units):
|
|
|
- * Number of remaining minutes or seconds
|
|
|
- * -1: Unknown
|
|
|
- * 8) min = minutes; sec = seconds
|
|
|
- */
|
|
|
-static int apm_read_proc(char *buf, char **start, off_t fpos, int length)
|
|
|
-{
|
|
|
- if (likely(apm_get_info))
|
|
|
- return apm_get_info(buf, start, fpos, length);
|
|
|
-
|
|
|
- return -EINVAL;
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-static int kapmd(void *arg)
|
|
|
-{
|
|
|
- daemonize("kapmd");
|
|
|
- current->flags |= PF_NOFREEZE;
|
|
|
-
|
|
|
- do {
|
|
|
- apm_event_t event;
|
|
|
-
|
|
|
- wait_event_interruptible(kapmd_wait,
|
|
|
- !queue_empty(&kapmd_queue) || !pm_active);
|
|
|
-
|
|
|
- if (!pm_active)
|
|
|
- break;
|
|
|
-
|
|
|
- spin_lock_irq(&kapmd_queue_lock);
|
|
|
- event = 0;
|
|
|
- if (!queue_empty(&kapmd_queue))
|
|
|
- event = queue_get_event(&kapmd_queue);
|
|
|
- spin_unlock_irq(&kapmd_queue_lock);
|
|
|
-
|
|
|
- switch (event) {
|
|
|
- case 0:
|
|
|
- break;
|
|
|
-
|
|
|
- case APM_LOW_BATTERY:
|
|
|
- case APM_POWER_STATUS_CHANGE:
|
|
|
- queue_event(event, NULL);
|
|
|
- break;
|
|
|
-
|
|
|
- case APM_USER_SUSPEND:
|
|
|
- case APM_SYS_SUSPEND:
|
|
|
- queue_event(event, NULL);
|
|
|
- if (suspends_pending == 0)
|
|
|
- apm_suspend();
|
|
|
- break;
|
|
|
-
|
|
|
- case APM_CRITICAL_SUSPEND:
|
|
|
- apm_suspend();
|
|
|
- break;
|
|
|
- }
|
|
|
- } while (1);
|
|
|
-
|
|
|
- complete_and_exit(&kapmd_exit, 0);
|
|
|
-}
|
|
|
-
|
|
|
-static int __init apm_init(void)
|
|
|
-{
|
|
|
- int ret;
|
|
|
-
|
|
|
- pm_active = 1;
|
|
|
-
|
|
|
- ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
|
|
|
- if (unlikely(ret < 0)) {
|
|
|
- pm_active = 0;
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- create_proc_info_entry("apm", 0, NULL, apm_read_proc);
|
|
|
-
|
|
|
- ret = misc_register(&apm_device);
|
|
|
- if (unlikely(ret != 0)) {
|
|
|
- remove_proc_entry("apm", NULL);
|
|
|
-
|
|
|
- pm_active = 0;
|
|
|
- wake_up(&kapmd_wait);
|
|
|
- wait_for_completion(&kapmd_exit);
|
|
|
- }
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static void __exit apm_exit(void)
|
|
|
-{
|
|
|
- misc_deregister(&apm_device);
|
|
|
- remove_proc_entry("apm", NULL);
|
|
|
-
|
|
|
- pm_active = 0;
|
|
|
- wake_up(&kapmd_wait);
|
|
|
- wait_for_completion(&kapmd_exit);
|
|
|
-}
|
|
|
-
|
|
|
-module_init(apm_init);
|
|
|
-module_exit(apm_exit);
|
|
|
-
|
|
|
-MODULE_AUTHOR("Stephen Rothwell, Andriy Skulysh");
|
|
|
-MODULE_DESCRIPTION("Advanced Power Management");
|
|
|
-MODULE_LICENSE("GPL");
|
Paul Mundt