From: Rodolfo Giometti <giometti@linux.it>
To: linux-laptop@vger.kernel.org, sfr@canb.auug.org.au
Cc: linux-mips@linux-mips.org
Subject: [PATCH] APM emulation reunion
Date: Thu, 20 Jul 2006 09:33:42 +0200 [thread overview]
Message-ID: <20060720073342.GL25330@enneenne.com> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1496 bytes --]
Hello,
here a patch to unify the APM enulation supports for ARM and MIPS.
I put APM emulation code into a dedicated directory so it can be used
to put there the APM-emu per board specific code. For instance on my
system I added the following lines to the "Kconfig" file:
config CONFIG_WWPC1000_APM_EMU
tristate "APM support for WWPC1000"
depends APM_EMU
default y
The kernel configuration file is now unique and not duplicated
anymore.
Also I modified the configuration define "CONFIG_APM" to
"CONFIG_APM_EMU" in order to avoid conflicts with real APM
support. Doing like this these boards' configuration files should be
updated:
arch/arm/configs/bast_defconfig:CONFIG_APM=y
arch/arm/configs/collie_defconfig:CONFIG_APM=y
arch/arm/configs/corgi_defconfig:CONFIG_APM=y
arch/arm/configs/ixp4xx_defconfig:CONFIG_APM=y
arch/arm/configs/neponset_defconfig:CONFIG_APM=y
arch/arm/configs/s3c2410_defconfig:CONFIG_APM=y
arch/arm/configs/simpad_defconfig:CONFIG_APM=y
arch/arm/configs/spitz_defconfig:CONFIG_APM=y
arch/arm/configs/trizeps4_defconfig:CONFIG_APM=y
Ciao,
Rodolfo
Signed-off-by: Rodolfo Giometti <giometti@linux.it>
--
GNU/Linux Solutions e-mail: giometti@enneenne.com
Linux Device Driver giometti@gnudd.com
Embedded Systems giometti@linux.it
UNIX programming phone: +39 349 2432127
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diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f81a623..d039838 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -797,32 +797,7 @@ menu "Power management options"
source "kernel/power/Kconfig"
-config APM
- tristate "Advanced Power Management Emulation"
- ---help---
- APM is a BIOS specification for saving power using several different
- techniques. This is mostly useful for battery powered laptops with
- APM compliant BIOSes. If you say Y here, the system time will be
- reset after a RESUME operation, the /proc/apm device will provide
- battery status information, and user-space programs will receive
- notification of APM "events" (e.g. battery status change).
-
- In order to use APM, you will need supporting software. For location
- and more information, read <file:Documentation/pm.txt> and the
- Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
- This driver does not spin down disk drives (see the hdparm(8)
- manpage ("man 8 hdparm") for that), and it doesn't turn off
- VESA-compliant "green" monitors.
-
- Generally, if you don't have a battery in your machine, there isn't
- much point in using this driver and you should say N. If you get
- random kernel OOPSes or reboots that don't seem to be related to
- anything, try disabling/enabling this option (or disabling/enabling
- APM in your BIOS).
-
-endmenu
+source "drivers/apm-emu/Kconfig"
source "net/Kconfig"
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index f0c0cdb..fe7d480 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -10,7 +10,6 @@ obj-y := compat.o entry-armv.o entry-co
process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
time.o traps.o
-obj-$(CONFIG_APM) += apm.o
obj-$(CONFIG_ISA_DMA_API) += dma.o
obj-$(CONFIG_ARCH_ACORN) += ecard.o
obj-$(CONFIG_FOOTBRIDGE) += isa.o
diff --git a/arch/arm/kernel/apm.c b/arch/arm/kernel/apm.c
deleted file mode 100644
index 33c5568..0000000
--- a/arch/arm/kernel/apm.c
+++ /dev/null
@@ -1,604 +0,0 @@
-/*
- * bios-less APM driver for ARM Linux
- * 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/capability.h>
-#include <linux/sched.h>
-#include <linux/pm.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/init.h>
-#include <linux/completion.h>
-
-#include <asm/apm.h> /* apm_power_info */
-#include <asm/system.h>
-
-/*
- * The apm_bios device is one of the misc char devices.
- * This is its minor number.
- */
-#define APM_MINOR_DEV 134
-
-/*
- * See Documentation/Config.help for the configuration options.
- *
- * Various options can be changed at boot time as follows:
- * (We allow underscores for compatibility with the modules code)
- * apm=on/off enable/disable APM
- */
-
-/*
- * 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 int apm_disabled;
-static int arm_apm_active;
-
-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;
-
-
-static const char driver_version[] = "1.13"; /* no spaces */
-
-
-
-/*
- * Compatibility cruft until the IPAQ people move over to the new
- * interface.
- */
-static void __apm_get_power_status(struct apm_power_info *info)
-{
-}
-
-/*
- * This allows machines to provide their own "apm get power status" function.
- */
-void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;
-EXPORT_SYMBOL(apm_get_power_status);
-
-
-/*
- * 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);
-}
-
-static void apm_suspend(void)
-{
- struct apm_user *as;
- int 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);
-}
-
-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 = (struct apm_user *)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_get_info(char *buf, char **start, off_t fpos, int length)
-{
- struct apm_power_info info;
- char *units;
- int ret;
-
- info.ac_line_status = 0xff;
- info.battery_status = 0xff;
- info.battery_flag = 0xff;
- info.battery_life = -1;
- info.time = -1;
- info.units = -1;
-
- if (apm_get_power_status)
- apm_get_power_status(&info);
-
- switch (info.units) {
- default: units = "?"; break;
- case 0: units = "min"; break;
- case 1: units = "sec"; break;
- }
-
- ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
- driver_version, APM_32_BIT_SUPPORT,
- info.ac_line_status, info.battery_status,
- info.battery_flag, info.battery_life,
- info.time, units);
-
- return ret;
-}
-#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) || !arm_apm_active);
-
- if (!arm_apm_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;
-
- if (apm_disabled) {
- printk(KERN_NOTICE "apm: disabled on user request.\n");
- return -ENODEV;
- }
-
- arm_apm_active = 1;
-
- ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
- if (ret < 0) {
- arm_apm_active = 0;
- return ret;
- }
-
-#ifdef CONFIG_PROC_FS
- create_proc_info_entry("apm", 0, NULL, apm_get_info);
-#endif
-
- ret = misc_register(&apm_device);
- if (ret != 0) {
- remove_proc_entry("apm", NULL);
-
- arm_apm_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);
-
- arm_apm_active = 0;
- wake_up(&kapmd_wait);
- wait_for_completion(&kapmd_exit);
-}
-
-module_init(apm_init);
-module_exit(apm_exit);
-
-MODULE_AUTHOR("Stephen Rothwell");
-MODULE_DESCRIPTION("Advanced Power Management");
-MODULE_LICENSE("GPL");
-
-#ifndef MODULE
-static int __init apm_setup(char *str)
-{
- while ((str != NULL) && (*str != '\0')) {
- if (strncmp(str, "off", 3) == 0)
- apm_disabled = 1;
- if (strncmp(str, "on", 2) == 0)
- apm_disabled = 0;
- str = strchr(str, ',');
- if (str != NULL)
- str += strspn(str, ", \t");
- }
- return 1;
-}
-
-__setup("apm=", apm_setup);
-#endif
-
-/**
- * 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)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&kapmd_queue_lock, flags);
- queue_add_event(&kapmd_queue, event);
- spin_unlock_irqrestore(&kapmd_queue_lock, flags);
-
- wake_up_interruptible(&kapmd_wait);
-}
-EXPORT_SYMBOL(apm_queue_event);
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 309757a..ccdee59 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2018,35 +2018,15 @@ config SECCOMP
If unsure, say Y. Only embedded should say N here.
-config PM
- bool "Power Management support (EXPERIMENTAL)"
- depends on EXPERIMENTAL && SOC_AU1X00
-
-config APM
- tristate "Advanced Power Management Emulation"
- depends on PM
- ---help---
- APM is a BIOS specification for saving power using several different
- techniques. This is mostly useful for battery powered systems with
- APM compliant BIOSes. If you say Y here, the system time will be
- reset after a RESUME operation, the /proc/apm device will provide
- battery status information, and user-space programs will receive
- notification of APM "events" (e.g. battery status change).
-
- In order to use APM, you will need supporting software. For location
- and more information, read <file:Documentation/pm.txt> and the
- Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
- This driver does not spin down disk drives (see the hdparm(8)
- manpage ("man 8 hdparm") for that), and it doesn't turn off
- VESA-compliant "green" monitors.
-
- Generally, if you don't have a battery in your machine, there isn't
- much point in using this driver and you should say N. If you get
- random kernel OOPSes or reboots that don't seem to be related to
- anything, try disabling/enabling this option (or disabling/enabling
- APM in your BIOS).
+endmenu
+
+menu "Power management options"
+
+if SOC_AU1X00
+source "kernel/power/Kconfig"
+endif
+
+source "drivers/apm-emu/Kconfig"
endmenu
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 881c467..34e8a25 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -13,8 +13,6 @@ binfmt_irix-objs := irixelf.o irixinv.o
obj-$(CONFIG_MODULES) += mips_ksyms.o module.o
-obj-$(CONFIG_APM) += apm.o
-
obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o
obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o
obj-$(CONFIG_CPU_TX49XX) += r4k_fpu.o r4k_switch.o
diff --git a/drivers/Makefile b/drivers/Makefile
index fc2d744..c3c2abd 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_PARISC) += parisc/
obj-$(CONFIG_RAPIDIO) += rapidio/
obj-y += video/
obj-$(CONFIG_ACPI) += acpi/
+obj-$(CONFIG_APM_EMU) += apm-emu/
# PnP must come after ACPI since it will eventually need to check if acpi
# was used and do nothing if so
obj-$(CONFIG_PNP) += pnp/
diff --git a/drivers/apm-emu/Kconfig b/drivers/apm-emu/Kconfig
new file mode 100644
index 0000000..a37f1cc
--- /dev/null
+++ b/drivers/apm-emu/Kconfig
@@ -0,0 +1,25 @@
+#
+# APM Emulator Configuration
+#
+
+config APM_EMU
+ tristate "Advanced Power Management (APM) Emulation"
+ ---help---
+ APM is a BIOS specification for saving power using several different
+ techniques. This is mostly useful for battery powered systems with
+ APM compliant BIOSes. If you say Y here, the system time will be
+ reset after a RESUME operation, the /proc/apm device will provide
+ battery status information, and user-space programs will receive
+ notification of APM "events" (e.g. battery status change).
+
+ In order to use APM, you will need supporting software. For location
+ and more information, read <file:Documentation/pm.txt> and the
+ Battery Powered Linux mini-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
+ Please, note that this driver is just an emulation of BIOS APM, so
+ you have to add specific support for your board in order to make
+ it work.
+
+ Generally, if you don't have a battery in your machine, there isn't
+ much point in using this driver and you should say N.
diff --git a/drivers/apm-emu/Makefile b/drivers/apm-emu/Makefile
new file mode 100644
index 0000000..751ce37
--- /dev/null
+++ b/drivers/apm-emu/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the Linux APM Emulator
+#
+
+obj-$(CONFIG_APM_EMU) += apm-emu.o
diff --git a/arch/mips/kernel/apm.c b/drivers/apm-emu/apm-emu.c
similarity index 90%
rename from arch/mips/kernel/apm.c
rename to drivers/apm-emu/apm-emu.c
index 528e731..e96dccf 100644
--- a/arch/mips/kernel/apm.c
+++ b/drivers/apm-emu/apm-emu.c
@@ -1,15 +1,39 @@
/*
- * bios-less APM driver for MIPS Linux
- * Jamey Hicks <jamey@crl.dec.com>
- * adapted from the APM BIOS driver for Linux by Stephen Rothwell (sfr@linuxcare.com)
+ * Generic bios-less APM driver for Linux
*
- * APM 1.2 Reference:
- * Intel Corporation, Microsoft Corporation. Advanced Power Management
- * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
+ * Derived from "arch/arm/kernel/apm.c" and generalized by
+ * Rodolfo Giometti <giometti@linux.it>
*
- * [This document is available from Microsoft at:
- * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
+ * Copyright 2006 Rodolfo Giometti <giometti@linux.it>
+ *
+ * Original copyright message:
+ *
+ * bios-less APM driver for ARM Linux
+ * 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]
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*/
+
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/timer.h>
@@ -80,7 +104,7 @@ #define SUSPEND_DONE 4 /* suspend compl
*/
static int suspends_pending;
static int apm_disabled;
-static int mips_apm_active;
+static int apm_emu_active;
static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
@@ -475,9 +499,9 @@ static int kapmd(void *arg)
apm_event_t event;
wait_event_interruptible(kapmd_wait,
- !queue_empty(&kapmd_queue) || !mips_apm_active);
+ !queue_empty(&kapmd_queue) || !apm_emu_active);
- if (!mips_apm_active)
+ if (!apm_emu_active)
break;
spin_lock_irq(&kapmd_queue_lock);
@@ -520,11 +544,11 @@ static int __init apm_init(void)
return -ENODEV;
}
- mips_apm_active = 1;
+ apm_emu_active = 1;
ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
if (ret < 0) {
- mips_apm_active = 0;
+ apm_emu_active = 0;
return ret;
}
@@ -536,7 +560,7 @@ #endif
if (ret != 0) {
remove_proc_entry("apm", NULL);
- mips_apm_active = 0;
+ apm_emu_active = 0;
wake_up(&kapmd_wait);
wait_for_completion(&kapmd_exit);
}
@@ -549,7 +573,7 @@ static void __exit apm_exit(void)
misc_deregister(&apm_device);
remove_proc_entry("apm", NULL);
- mips_apm_active = 0;
+ apm_emu_active = 0;
wake_up(&kapmd_wait);
wait_for_completion(&kapmd_exit);
}
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