[APM] SH: Convert to use shared APM emulation.

config GENERIC_TIME

	def_bool n

config SYS_SUPPORTS_APM_EMULATION

	bool

config ARCH_MAY_HAVE_PC_FDC

	bool

config SH_HP6XX

	bool "HP6XX"

	select SYS_SUPPORTS_APM_EMULATION

	help

	  Select HP6XX if configuring for a HP jornada HP6xx.

	  More information (hardware only) at

source kernel/power/Kconfig

config APM

	bool "Advanced Power Management Emulation"

	depends on PM

endmenu

source "net/Kconfig"

 * modify it under the terms of the GNU General Public License.

 */

#include <linux/module.h>

#include <linux/apm_bios.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <asm/io.h>

#include <asm/apm.h>

#include <linux/apm-emulation.h>

#include <linux/io.h>

#include <asm/adc.h>

#include <asm/hp6xx.h>

#define MODNAME "hp6x0_apm"

static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)

static void hp6x0_apm_get_power_status(struct apm_power_info *info)

{

	int battery, backup, charging, percentage;

	u8 pgdr;

	char *p;

	int battery_status;

	int battery_flag;

	int ac_line_status;

	int time_units = APM_BATTERY_LIFE_UNKNOWN;

	int battery = adc_single(ADC_CHANNEL_BATTERY);

	int backup = adc_single(ADC_CHANNEL_BACKUP);

	int charging = adc_single(ADC_CHANNEL_CHARGE);

	int percentage;

	battery		= adc_single(ADC_CHANNEL_BATTERY);

	backup		= adc_single(ADC_CHANNEL_BACKUP);

	charging	= adc_single(ADC_CHANNEL_CHARGE);

	percentage = 100 * (battery - HP680_BATTERY_MIN) /

			   (HP680_BATTERY_MAX - HP680_BATTERY_MIN);

	ac_line_status = (battery > HP680_BATTERY_AC_ON) ?

	info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?

			 APM_AC_ONLINE : APM_AC_OFFLINE;

	p = buf;

	pgdr = ctrl_inb(SH7709_PGDR);

	if (pgdr & PGDR_MAIN_BATTERY_OUT) {

		battery_status = APM_BATTERY_STATUS_NOT_PRESENT;

		battery_flag = 0x80;

		percentage = -1;

		info->battery_status	= APM_BATTERY_STATUS_NOT_PRESENT;

		info->battery_flag	= 0x80;

	} else if (charging < 8) {

		battery_status = APM_BATTERY_STATUS_CHARGING;

		battery_flag = 0x08;

		ac_line_status = 0xff;

		info->battery_status	= APM_BATTERY_STATUS_CHARGING;

		info->battery_flag	= 0x08;

		info->ac_line_status = 0xff;

	} else if (percentage <= APM_CRITICAL) {

		battery_status = APM_BATTERY_STATUS_CRITICAL;

		battery_flag = 0x04;

		info->battery_status	= APM_BATTERY_STATUS_CRITICAL;

		info->battery_flag	= 0x04;

	} else if (percentage <= APM_LOW) {

		battery_status = APM_BATTERY_STATUS_LOW;

		battery_flag = 0x02;

		info->battery_status	= APM_BATTERY_STATUS_LOW;

		info->battery_flag	= 0x02;

	} else {

		battery_status = APM_BATTERY_STATUS_HIGH;

		battery_flag = 0x01;

		info->battery_status	= APM_BATTERY_STATUS_HIGH;

		info->battery_flag	= 0x01;

	}

	p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",

		     APM_32_BIT_SUPPORT,

		     ac_line_status,

		     battery_status,

		     battery_flag,

		     percentage,

		     time_units,

		     "min");

	p += sprintf(p, "bat=%d backup=%d charge=%d\n",

		     battery, backup, charging);

	return p - buf;

	info->units = 0;

}

static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)

	int ret;

	ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,

			  IRQF_DISABLED, MODNAME, 0);

			  IRQF_DISABLED, MODNAME, NULL);

	if (unlikely(ret < 0)) {

		printk(KERN_ERR MODNAME ": IRQ %d request failed\n",

		       HP680_BTN_IRQ);

		return ret;

	}

	apm_get_info = hp6x0_apm_get_info;

	apm_get_power_status = hp6x0_apm_get_power_status;

	return ret;

}

static void __exit hp6x0_apm_exit(void)

{

	free_irq(HP680_BTN_IRQ, 0);

	apm_get_info = 0;

	apm_get_info = NULL;

}

module_init(hp6x0_apm_init);

obj-$(CONFIG_MODULES)		+= module.o

obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o

obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o

obj-$(CONFIG_APM)		+= apm.o

obj-$(CONFIG_PM)		+= pm.o

obj-$(CONFIG_STACKTRACE)	+= stacktrace.o

/*

 * bios-less APM driver for hp680

 *

 * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>

 *

 * based on ARM APM driver by

 *  Jamey Hicks <jamey@crl.dec.com>

 *

 * adapted from the APM BIOS driver for Linux by

 *  Stephen Rothwell (sfr@linuxcare.com)

 *

 * APM 1.2 Reference:

 *   Intel Corporation, Microsoft Corporation. Advanced Power Management

 *   (APM) BIOS Interface Specification, Revision 1.2, February 1996.

 *

 * [This document is available from Microsoft at:

 *    http://www.microsoft.com/hwdev/busbios/amp_12.htm]

 */

#include <linux/module.h>

#include <linux/poll.h>

#include <linux/timer.h>

#include <linux/slab.h>

#include <linux/proc_fs.h>

#include <linux/miscdevice.h>

#include <linux/apm_bios.h>

#include <linux/pm.h>

#include <linux/pm_legacy.h>

#include <asm/apm.h>

#define MODNAME "apm"

/*

 * The apm_bios device is one of the misc char devices.

 * This is its minor number.

 */

#define APM_MINOR_DEV			134

/*

 * Maximum number of events stored

 */

#define APM_MAX_EVENTS			16

struct apm_queue {

	unsigned int		event_head;

	unsigned int		event_tail;

	apm_event_t		events[APM_MAX_EVENTS];

};

/*

 * The per-file APM data

 */

struct apm_user {

	struct list_head	list;

	unsigned int		suser: 1;

	unsigned int		writer: 1;

	unsigned int		reader: 1;

	int			suspend_result;

	unsigned int		suspend_state;

#define SUSPEND_NONE	0		/* no suspend pending */

#define SUSPEND_PENDING	1		/* suspend pending read */

#define SUSPEND_READ	2		/* suspend read, pending ack */

#define SUSPEND_ACKED	3		/* suspend acked */

#define SUSPEND_DONE	4		/* suspend completed */

	struct apm_queue	queue;

};

/*

 * Local variables

 */

static int suspends_pending;

static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);

static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);

/*

 * This is a list of everyone who has opened /dev/apm_bios

 */

static DECLARE_RWSEM(user_list_lock);

static LIST_HEAD(apm_user_list);

/*

 * kapmd info.  kapmd provides us a process context to handle

 * "APM" events within - specifically necessary if we're going

 * to be suspending the system.

 */

static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);

static DECLARE_COMPLETION(kapmd_exit);

static DEFINE_SPINLOCK(kapmd_queue_lock);

static struct apm_queue kapmd_queue;

int apm_suspended;

EXPORT_SYMBOL(apm_suspended);

/* Platform-specific apm_read_proc(). */

int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);

EXPORT_SYMBOL(apm_get_info);

/*

 * APM event queue management.

 */

static inline int queue_empty(struct apm_queue *q)

{

	return q->event_head == q->event_tail;

}

static inline apm_event_t queue_get_event(struct apm_queue *q)

{

	q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;

	return q->events[q->event_tail];

}

static void queue_add_event(struct apm_queue *q, apm_event_t event)

{

	q->event_head = (q->event_head + 1) % APM_MAX_EVENTS;

	if (q->event_head == q->event_tail) {

		static int notified;

		if (notified++ == 0)

			printk(KERN_ERR "apm: an event queue overflowed\n");

		q->event_tail = (q->event_tail + 1) % APM_MAX_EVENTS;

	}

	q->events[q->event_head] = event;

}

static void queue_event_one_user(struct apm_user *as, apm_event_t event)

{

	if (as->suser && as->writer) {

		switch (event) {

		case APM_SYS_SUSPEND:

		case APM_USER_SUSPEND:

			/*

			 * If this user already has a suspend pending,

			 * don't queue another one.

			 */

			if (as->suspend_state != SUSPEND_NONE)

				return;

			as->suspend_state = SUSPEND_PENDING;

			suspends_pending++;

			break;

		}

	}

	queue_add_event(&as->queue, event);

}

static void queue_event(apm_event_t event, struct apm_user *sender)

{

	struct apm_user *as;

	down_read(&user_list_lock);

	list_for_each_entry(as, &apm_user_list, list)

		if (as != sender && as->reader)

			queue_event_one_user(as, event);

	up_read(&user_list_lock);

	wake_up_interruptible(&apm_waitqueue);

}

/**

 * apm_queue_event - queue an APM event for kapmd

 * @event: APM event

 *

 * Queue an APM event for kapmd to process and ultimately take the

 * appropriate action.  Only a subset of events are handled:

 *   %APM_LOW_BATTERY

 *   %APM_POWER_STATUS_CHANGE

 *   %APM_USER_SUSPEND

 *   %APM_SYS_SUSPEND

 *   %APM_CRITICAL_SUSPEND

 */

void apm_queue_event(apm_event_t event)

{

	spin_lock_irq(&kapmd_queue_lock);

	queue_add_event(&kapmd_queue, event);

	spin_unlock_irq(&kapmd_queue_lock);

	wake_up_interruptible(&kapmd_wait);

}

EXPORT_SYMBOL(apm_queue_event);

static void apm_suspend(void)

{

	struct apm_user *as;

	int err;

	apm_suspended = 1;

	err = pm_suspend(PM_SUSPEND_MEM);

	/*

	 * Anyone on the APM queues will think we're still suspended.

	 * Send a message so everyone knows we're now awake again.

	 */

	queue_event(APM_NORMAL_RESUME, NULL);

	/*

	 * Finally, wake up anyone who is sleeping on the suspend.

	 */

	down_read(&user_list_lock);

	list_for_each_entry(as, &apm_user_list, list) {

		as->suspend_result = err;

		as->suspend_state = SUSPEND_DONE;

	}

	up_read(&user_list_lock);

	wake_up(&apm_suspend_waitqueue);

	apm_suspended = 0;

}

static ssize_t apm_read(struct file *fp, char __user *buf,

			size_t count, loff_t *ppos)

{

	struct apm_user *as = fp->private_data;

	apm_event_t event;

	int i = count, ret = 0;

	if (count < sizeof(apm_event_t))

		return -EINVAL;

	if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)

		return -EAGAIN;

	wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));

	while ((i >= sizeof(event)) && !queue_empty(&as->queue)) {

		event = queue_get_event(&as->queue);

		ret = -EFAULT;

		if (copy_to_user(buf, &event, sizeof(event)))

			break;

		if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND)

			as->suspend_state = SUSPEND_READ;

		buf += sizeof(event);

		i -= sizeof(event);

	}

	if (i < count)

		ret = count - i;

	return ret;

}

static unsigned int apm_poll(struct file *fp, poll_table * wait)

{

	struct apm_user *as = fp->private_data;

	poll_wait(fp, &apm_waitqueue, wait);

	return queue_empty(&as->queue) ? 0 : POLLIN | POLLRDNORM;

}

/*

 * apm_ioctl - handle APM ioctl

 *

 * APM_IOC_SUSPEND

 *   This IOCTL is overloaded, and performs two functions.  It is used to:

 *     - initiate a suspend

 *     - acknowledge a suspend read from /dev/apm_bios.

 *   Only when everyone who has opened /dev/apm_bios with write permission

 *   has acknowledge does the actual suspend happen.

 */

static int

apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)

{

	struct apm_user *as = filp->private_data;

	unsigned long flags;

	int err = -EINVAL;

	if (!as->suser || !as->writer)

		return -EPERM;

	switch (cmd) {

	case APM_IOC_SUSPEND:

		as->suspend_result = -EINTR;

		if (as->suspend_state == SUSPEND_READ) {

			/*

			 * If we read a suspend command from /dev/apm_bios,

			 * then the corresponding APM_IOC_SUSPEND ioctl is

			 * interpreted as an acknowledge.

			 */

			as->suspend_state = SUSPEND_ACKED;

			suspends_pending--;

		} else {

			/*

			 * Otherwise it is a request to suspend the system.

			 * Queue an event for all readers, and expect an

			 * acknowledge from all writers who haven't already

			 * acknowledged.

			 */

			queue_event(APM_USER_SUSPEND, as);

		}

		/*

		 * If there are no further acknowledges required, suspend

		 * the system.

		 */

		if (suspends_pending == 0)

			apm_suspend();

		/*

		 * Wait for the suspend/resume to complete.  If there are

		 * pending acknowledges, we wait here for them.

		 *

		 * Note that we need to ensure that the PM subsystem does

		 * not kick us out of the wait when it suspends the threads.

		 */

		flags = current->flags;

		current->flags |= PF_NOFREEZE;

		/*

		 * Note: do not allow a thread which is acking the suspend

		 * to escape until the resume is complete.

		 */

		if (as->suspend_state == SUSPEND_ACKED)

			wait_event(apm_suspend_waitqueue,

					 as->suspend_state == SUSPEND_DONE);

		else

			wait_event_interruptible(apm_suspend_waitqueue,

					 as->suspend_state == SUSPEND_DONE);

		current->flags = flags;

		err = as->suspend_result;

		as->suspend_state = SUSPEND_NONE;

		break;

	}

	return err;

}

static int apm_release(struct inode * inode, struct file * filp)

{

	struct apm_user *as = filp->private_data;

	filp->private_data = NULL;

	down_write(&user_list_lock);

	list_del(&as->list);

	up_write(&user_list_lock);

	/*

	 * We are now unhooked from the chain.  As far as new

	 * events are concerned, we no longer exist.  However, we

	 * need to balance suspends_pending, which means the

	 * possibility of sleeping.

	 */

	if (as->suspend_state != SUSPEND_NONE) {

		suspends_pending -= 1;

		if (suspends_pending == 0)

			apm_suspend();

	}

	kfree(as);

	return 0;

}

static int apm_open(struct inode * inode, struct file * filp)

{

	struct apm_user *as;

	as = kzalloc(sizeof(*as), GFP_KERNEL);

	if (as) {

		/*

		 * XXX - this is a tiny bit broken, when we consider BSD

		 * process accounting. If the device is opened by root, we

		 * instantly flag that we used superuser privs. Who knows,

		 * we might close the device immediately without doing a

		 * privileged operation -- cevans

		 */

		as->suser = capable(CAP_SYS_ADMIN);

		as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;

		as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;

		down_write(&user_list_lock);

		list_add(&as->list, &apm_user_list);

		up_write(&user_list_lock);

		filp->private_data = as;

	}

	return as ? 0 : -ENOMEM;

}

static struct file_operations apm_bios_fops = {

	.owner		= THIS_MODULE,

	.read		= apm_read,

	.poll		= apm_poll,

	.ioctl		= apm_ioctl,

	.open		= apm_open,

	.release	= apm_release,

};

static struct miscdevice apm_device = {

	.minor		= APM_MINOR_DEV,

	.name		= "apm_bios",

	.fops		= &apm_bios_fops

};

#ifdef CONFIG_PROC_FS

/*

 * Arguments, with symbols from linux/apm_bios.h.

 *

 *   0) Linux driver version (this will change if format changes)

 *   1) APM BIOS Version.  Usually 1.0, 1.1 or 1.2.

 *   2) APM flags from APM Installation Check (0x00):

 *	bit 0: APM_16_BIT_SUPPORT

 *	bit 1: APM_32_BIT_SUPPORT

 *	bit 2: APM_IDLE_SLOWS_CLOCK

 *	bit 3: APM_BIOS_DISABLED

 *	bit 4: APM_BIOS_DISENGAGED

 *   3) AC line status

 *	0x00: Off-line

 *	0x01: On-line

 *	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");

/*

 * Copyright 2006 (c) Andriy Skulysh <askulysh@gmail.com>

 *

 * 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.

 *

 */

#ifndef __ASM_SH_APM_H

#define __ASM_SH_APM_H

#define APM_AC_OFFLINE			0

#define APM_AC_ONLINE			1

#define APM_AC_BACKUP			2

#define APM_AC_UNKNOWN			0xff

#define APM_BATTERY_STATUS_HIGH		0

#define APM_BATTERY_STATUS_LOW		1

#define APM_BATTERY_STATUS_CRITICAL	2

#define APM_BATTERY_STATUS_CHARGING	3

#define APM_BATTERY_STATUS_NOT_PRESENT	4

#define APM_BATTERY_STATUS_UNKNOWN	0xff

#define APM_BATTERY_LIFE_UNKNOWN	0xFFFF

#define APM_BATTERY_LIFE_MINUTES	0x8000

#define APM_BATTERY_LIFE_VALUE_MASK	0x7FFF

#define APM_BATTERY_FLAG_HIGH		(1 << 0)

#define APM_BATTERY_FLAG_LOW		(1 << 1)

#define APM_BATTERY_FLAG_CRITICAL	(1 << 2)

#define APM_BATTERY_FLAG_CHARGING	(1 << 3)

#define APM_BATTERY_FLAG_NOT_PRESENT	(1 << 7)

#define APM_BATTERY_FLAG_UNKNOWN	0xff

#define APM_UNITS_MINS			0

#define APM_UNITS_SECS			1

#define APM_UNITS_UNKNOWN		-1

extern int (*apm_get_info)(char *buf, char **start, off_t fpos, int length);

extern int apm_suspended;

void apm_queue_event(apm_event_t event);

#endif