Commit 0a9b0db1 authored by Paul Mundt's avatar Paul Mundt Committed by Ralf Baechle
Browse files

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


Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 2116245e
......@@ -48,6 +48,9 @@ config GENERIC_IOMAP
config GENERIC_TIME
def_bool n
config SYS_SUPPORTS_APM_EMULATION
bool
config ARCH_MAY_HAVE_PC_FDC
bool
......@@ -126,6 +129,7 @@ config SH_7751_SYSTEMH
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
......@@ -694,9 +698,6 @@ depends on EXPERIMENTAL
source kernel/power/Kconfig
config APM
bool "Advanced Power Management Emulation"
depends on PM
endmenu
source "net/Kconfig"
......
......@@ -7,12 +7,11 @@
* 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>
......@@ -27,60 +26,41 @@
#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;
} else if (charging < 8 ) {
battery_status = APM_BATTERY_STATUS_CHARGING;
battery_flag = 0x08;
ac_line_status = 0xff;
info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
info->battery_flag = 0x80;
} else if (charging < 8) {
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)
......@@ -96,14 +76,14 @@ static int __init hp6x0_apm_init(void)
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;
}
......@@ -111,7 +91,7 @@ static int __init hp6x0_apm_init(void)
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);
......
......@@ -19,6 +19,5 @@ obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
obj-$(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: