![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
554 lines
13 KiB
C
554 lines
13 KiB
C
/* APM emulation layer for PowerMac
|
|
*
|
|
* Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
|
|
*
|
|
* Lots of code inherited from apm.c, see appropriate notice in
|
|
* arch/i386/kernel/apm.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2, or (at your option) any
|
|
* later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/poll.h>
|
|
#include <linux/types.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/apm_bios.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/smp_lock.h>
|
|
|
|
#include <linux/adb.h>
|
|
#include <linux/pmu.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/machdep.h>
|
|
|
|
#undef DEBUG
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(args...) printk(KERN_DEBUG args)
|
|
//#define DBG(args...) xmon_printf(args)
|
|
#else
|
|
#define DBG(args...) do { } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* 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 20
|
|
|
|
#define FAKE_APM_BIOS_VERSION 0x0101
|
|
|
|
#define APM_USER_NOTIFY_TIMEOUT (5*HZ)
|
|
|
|
/*
|
|
* The per-file APM data
|
|
*/
|
|
struct apm_user {
|
|
int magic;
|
|
struct apm_user * next;
|
|
int suser: 1;
|
|
int suspend_waiting: 1;
|
|
int suspends_pending;
|
|
int suspends_read;
|
|
int event_head;
|
|
int event_tail;
|
|
apm_event_t events[APM_MAX_EVENTS];
|
|
};
|
|
|
|
/*
|
|
* The magic number in apm_user
|
|
*/
|
|
#define APM_BIOS_MAGIC 0x4101
|
|
|
|
/*
|
|
* Local variables
|
|
*/
|
|
static int suspends_pending;
|
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
|
|
static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
|
|
static struct apm_user * user_list;
|
|
|
|
static int apm_notify_sleep(struct pmu_sleep_notifier *self, int when);
|
|
static struct pmu_sleep_notifier apm_sleep_notifier = {
|
|
apm_notify_sleep,
|
|
SLEEP_LEVEL_USERLAND,
|
|
};
|
|
|
|
static char driver_version[] = "0.5"; /* no spaces */
|
|
|
|
#ifdef DEBUG
|
|
static char * apm_event_name[] = {
|
|
"system standby",
|
|
"system suspend",
|
|
"normal resume",
|
|
"critical resume",
|
|
"low battery",
|
|
"power status change",
|
|
"update time",
|
|
"critical suspend",
|
|
"user standby",
|
|
"user suspend",
|
|
"system standby resume",
|
|
"capabilities change"
|
|
};
|
|
#define NR_APM_EVENT_NAME \
|
|
(sizeof(apm_event_name) / sizeof(apm_event_name[0]))
|
|
|
|
#endif
|
|
|
|
static int queue_empty(struct apm_user *as)
|
|
{
|
|
return as->event_head == as->event_tail;
|
|
}
|
|
|
|
static apm_event_t get_queued_event(struct apm_user *as)
|
|
{
|
|
as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
|
|
return as->events[as->event_tail];
|
|
}
|
|
|
|
static void queue_event(apm_event_t event, struct apm_user *sender)
|
|
{
|
|
struct apm_user * as;
|
|
|
|
DBG("apm_emu: queue_event(%s)\n", apm_event_name[event-1]);
|
|
if (user_list == NULL)
|
|
return;
|
|
for (as = user_list; as != NULL; as = as->next) {
|
|
if (as == sender)
|
|
continue;
|
|
as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
|
|
if (as->event_head == as->event_tail) {
|
|
static int notified;
|
|
|
|
if (notified++ == 0)
|
|
printk(KERN_ERR "apm_emu: an event queue overflowed\n");
|
|
as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
|
|
}
|
|
as->events[as->event_head] = event;
|
|
if (!as->suser)
|
|
continue;
|
|
switch (event) {
|
|
case APM_SYS_SUSPEND:
|
|
case APM_USER_SUSPEND:
|
|
as->suspends_pending++;
|
|
suspends_pending++;
|
|
break;
|
|
case APM_NORMAL_RESUME:
|
|
as->suspend_waiting = 0;
|
|
break;
|
|
}
|
|
}
|
|
wake_up_interruptible(&apm_waitqueue);
|
|
}
|
|
|
|
static int check_apm_user(struct apm_user *as, const char *func)
|
|
{
|
|
if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
|
|
printk(KERN_ERR "apm_emu: %s passed bad filp\n", func);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct apm_user * as;
|
|
size_t i;
|
|
apm_event_t event;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
as = fp->private_data;
|
|
if (check_apm_user(as, "read"))
|
|
return -EIO;
|
|
if (count < sizeof(apm_event_t))
|
|
return -EINVAL;
|
|
if (queue_empty(as)) {
|
|
if (fp->f_flags & O_NONBLOCK)
|
|
return -EAGAIN;
|
|
add_wait_queue(&apm_waitqueue, &wait);
|
|
repeat:
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (queue_empty(as) && !signal_pending(current)) {
|
|
schedule();
|
|
goto repeat;
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&apm_waitqueue, &wait);
|
|
}
|
|
i = count;
|
|
while ((i >= sizeof(event)) && !queue_empty(as)) {
|
|
event = get_queued_event(as);
|
|
DBG("apm_emu: do_read, returning: %s\n", apm_event_name[event-1]);
|
|
if (copy_to_user(buf, &event, sizeof(event))) {
|
|
if (i < count)
|
|
break;
|
|
return -EFAULT;
|
|
}
|
|
switch (event) {
|
|
case APM_SYS_SUSPEND:
|
|
case APM_USER_SUSPEND:
|
|
as->suspends_read++;
|
|
break;
|
|
}
|
|
buf += sizeof(event);
|
|
i -= sizeof(event);
|
|
}
|
|
if (i < count)
|
|
return count - i;
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int do_poll(struct file *fp, poll_table * wait)
|
|
{
|
|
struct apm_user * as;
|
|
|
|
as = fp->private_data;
|
|
if (check_apm_user(as, "poll"))
|
|
return 0;
|
|
poll_wait(fp, &apm_waitqueue, wait);
|
|
if (!queue_empty(as))
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
|
|
static int do_ioctl(struct inode * inode, struct file *filp,
|
|
u_int cmd, u_long arg)
|
|
{
|
|
struct apm_user * as;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
as = filp->private_data;
|
|
if (check_apm_user(as, "ioctl"))
|
|
return -EIO;
|
|
if (!as->suser)
|
|
return -EPERM;
|
|
switch (cmd) {
|
|
case APM_IOC_SUSPEND:
|
|
/* If a suspend message was sent to userland, we
|
|
* consider this as a confirmation message
|
|
*/
|
|
if (as->suspends_read > 0) {
|
|
as->suspends_read--;
|
|
as->suspends_pending--;
|
|
suspends_pending--;
|
|
} else {
|
|
// Route to PMU suspend ?
|
|
break;
|
|
}
|
|
as->suspend_waiting = 1;
|
|
add_wait_queue(&apm_waitqueue, &wait);
|
|
DBG("apm_emu: ioctl waking up sleep waiter !\n");
|
|
wake_up(&apm_suspend_waitqueue);
|
|
mb();
|
|
while(as->suspend_waiting && !signal_pending(current)) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&apm_waitqueue, &wait);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_release(struct inode * inode, struct file * filp)
|
|
{
|
|
struct apm_user * as;
|
|
|
|
as = filp->private_data;
|
|
if (check_apm_user(as, "release"))
|
|
return 0;
|
|
filp->private_data = NULL;
|
|
lock_kernel();
|
|
if (as->suspends_pending > 0) {
|
|
suspends_pending -= as->suspends_pending;
|
|
if (suspends_pending <= 0)
|
|
wake_up(&apm_suspend_waitqueue);
|
|
}
|
|
if (user_list == as)
|
|
user_list = as->next;
|
|
else {
|
|
struct apm_user * as1;
|
|
|
|
for (as1 = user_list;
|
|
(as1 != NULL) && (as1->next != as);
|
|
as1 = as1->next)
|
|
;
|
|
if (as1 == NULL)
|
|
printk(KERN_ERR "apm: filp not in user list\n");
|
|
else
|
|
as1->next = as->next;
|
|
}
|
|
unlock_kernel();
|
|
kfree(as);
|
|
return 0;
|
|
}
|
|
|
|
static int do_open(struct inode * inode, struct file * filp)
|
|
{
|
|
struct apm_user * as;
|
|
|
|
as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
|
|
if (as == NULL) {
|
|
printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
|
|
sizeof(*as));
|
|
return -ENOMEM;
|
|
}
|
|
as->magic = APM_BIOS_MAGIC;
|
|
as->event_tail = as->event_head = 0;
|
|
as->suspends_pending = 0;
|
|
as->suspends_read = 0;
|
|
/*
|
|
* 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->next = user_list;
|
|
user_list = as;
|
|
filp->private_data = as;
|
|
|
|
DBG("apm_emu: opened by %s, suser: %d\n", current->comm, (int)as->suser);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Wait for all clients to ack the suspend request. APM API
|
|
* doesn't provide a way to NAK, but this could be added
|
|
* here.
|
|
*/
|
|
static int wait_all_suspend(void)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
add_wait_queue(&apm_suspend_waitqueue, &wait);
|
|
DBG("apm_emu: wait_all_suspend(), suspends_pending: %d\n", suspends_pending);
|
|
while(suspends_pending > 0) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&apm_suspend_waitqueue, &wait);
|
|
|
|
DBG("apm_emu: wait_all_suspend() - complete !\n");
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int apm_notify_sleep(struct pmu_sleep_notifier *self, int when)
|
|
{
|
|
switch(when) {
|
|
case PBOOK_SLEEP_REQUEST:
|
|
queue_event(APM_SYS_SUSPEND, NULL);
|
|
if (!wait_all_suspend())
|
|
return PBOOK_SLEEP_REFUSE;
|
|
break;
|
|
case PBOOK_SLEEP_REJECT:
|
|
case PBOOK_WAKE:
|
|
queue_event(APM_NORMAL_RESUME, NULL);
|
|
break;
|
|
}
|
|
return PBOOK_SLEEP_OK;
|
|
}
|
|
|
|
#define APM_CRITICAL 10
|
|
#define APM_LOW 30
|
|
|
|
static int apm_emu_get_info(char *buf, char **start, off_t fpos, int length)
|
|
{
|
|
/* Arguments, with symbols from linux/apm_bios.h. Information is
|
|
from the Get Power Status (0x0a) call unless otherwise noted.
|
|
|
|
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 */
|
|
|
|
unsigned short ac_line_status = 0xff;
|
|
unsigned short battery_status = 0xff;
|
|
unsigned short battery_flag = 0xff;
|
|
int percentage = -1;
|
|
int time_units = -1;
|
|
int real_count = 0;
|
|
int i;
|
|
char * p = buf;
|
|
char charging = 0;
|
|
long charge = -1;
|
|
long amperage = 0;
|
|
unsigned long btype = 0;
|
|
|
|
ac_line_status = ((pmu_power_flags & PMU_PWR_AC_PRESENT) != 0);
|
|
for (i=0; i<pmu_battery_count; i++) {
|
|
if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
|
|
if (percentage < 0)
|
|
percentage = 0;
|
|
if (charge < 0)
|
|
charge = 0;
|
|
percentage += (pmu_batteries[i].charge * 100) /
|
|
pmu_batteries[i].max_charge;
|
|
charge += pmu_batteries[i].charge;
|
|
amperage += pmu_batteries[i].amperage;
|
|
if (btype == 0)
|
|
btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
|
|
real_count++;
|
|
if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
|
|
charging++;
|
|
}
|
|
}
|
|
if (real_count) {
|
|
if (amperage < 0) {
|
|
if (btype == PMU_BATT_TYPE_SMART)
|
|
time_units = (charge * 59) / (amperage * -1);
|
|
else
|
|
time_units = (charge * 16440) / (amperage * -60);
|
|
}
|
|
percentage /= real_count;
|
|
if (charging > 0) {
|
|
battery_status = 0x03;
|
|
battery_flag = 0x08;
|
|
} else if (percentage <= APM_CRITICAL) {
|
|
battery_status = 0x02;
|
|
battery_flag = 0x04;
|
|
} else if (percentage <= APM_LOW) {
|
|
battery_status = 0x01;
|
|
battery_flag = 0x02;
|
|
} else {
|
|
battery_status = 0x00;
|
|
battery_flag = 0x01;
|
|
}
|
|
}
|
|
p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
|
|
driver_version,
|
|
(FAKE_APM_BIOS_VERSION >> 8) & 0xff,
|
|
FAKE_APM_BIOS_VERSION & 0xff,
|
|
0,
|
|
ac_line_status,
|
|
battery_status,
|
|
battery_flag,
|
|
percentage,
|
|
time_units,
|
|
"min");
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
static struct file_operations apm_bios_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = do_read,
|
|
.poll = do_poll,
|
|
.ioctl = do_ioctl,
|
|
.open = do_open,
|
|
.release = do_release,
|
|
};
|
|
|
|
static struct miscdevice apm_device = {
|
|
APM_MINOR_DEV,
|
|
"apm_bios",
|
|
&apm_bios_fops
|
|
};
|
|
|
|
static int __init apm_emu_init(void)
|
|
{
|
|
struct proc_dir_entry *apm_proc;
|
|
|
|
if (sys_ctrler != SYS_CTRLER_PMU) {
|
|
printk(KERN_INFO "apm_emu: Requires a machine with a PMU.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
apm_proc = create_proc_info_entry("apm", 0, NULL, apm_emu_get_info);
|
|
if (apm_proc)
|
|
apm_proc->owner = THIS_MODULE;
|
|
|
|
misc_register(&apm_device);
|
|
|
|
pmu_register_sleep_notifier(&apm_sleep_notifier);
|
|
|
|
printk(KERN_INFO "apm_emu: APM Emulation %s initialized.\n", driver_version);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit apm_emu_exit(void)
|
|
{
|
|
pmu_unregister_sleep_notifier(&apm_sleep_notifier);
|
|
misc_deregister(&apm_device);
|
|
remove_proc_entry("apm", NULL);
|
|
|
|
printk(KERN_INFO "apm_emu: APM Emulation removed.\n");
|
|
}
|
|
|
|
module_init(apm_emu_init);
|
|
module_exit(apm_emu_exit);
|
|
|
|
MODULE_AUTHOR("Benjamin Herrenschmidt");
|
|
MODULE_DESCRIPTION("APM emulation layer for PowerMac");
|
|
MODULE_LICENSE("GPL");
|
|
|