[MIPS] APM emu support
Signed-off-by: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Rodolfo Giometti
Ralf Baechle
parent
aa9772e330
commit
952fa954a6
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@ -1890,6 +1890,32 @@ config PM
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bool "Power Management support (EXPERIMENTAL)"
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depends on EXPERIMENTAL && SOC_AU1X00
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config APM
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tristate "Advanced Power Management Emulation"
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depends on PM
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---help---
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APM is a BIOS specification for saving power using several different
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techniques. This is mostly useful for battery powered systems with
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APM compliant BIOSes. If you say Y here, the system time will be
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reset after a RESUME operation, the /proc/apm device will provide
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battery status information, and user-space programs will receive
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notification of APM "events" (e.g. battery status change).
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In order to use APM, you will need supporting software. For location
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and more information, read <file:Documentation/pm.txt> and the
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Battery Powered Linux mini-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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This driver does not spin down disk drives (see the hdparm(8)
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manpage ("man 8 hdparm") for that), and it doesn't turn off
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VESA-compliant "green" monitors.
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Generally, if you don't have a battery in your machine, there isn't
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much point in using this driver and you should say N. If you get
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random kernel OOPSes or reboots that don't seem to be related to
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anything, try disabling/enabling this option (or disabling/enabling
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APM in your BIOS).
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endmenu
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source "net/Kconfig"
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@ -13,6 +13,8 @@ binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \
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obj-$(CONFIG_MODULES) += mips_ksyms.o module.o
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obj-$(CONFIG_APM) += apm.o
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obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o
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obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o
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obj-$(CONFIG_CPU_TX49XX) += r4k_fpu.o r4k_switch.o
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@ -0,0 +1,605 @@
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/*
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* bios-less APM driver for MIPS Linux
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* Jamey Hicks <jamey@crl.dec.com>
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* adapted from the APM BIOS driver for Linux by 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/config.h>
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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/capability.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <asm/apm.h> /* apm_power_info */
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#include <asm/system.h>
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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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* See Documentation/Config.help for the configuration options.
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*
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* Various options can be changed at boot time as follows:
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* (We allow underscores for compatibility with the modules code)
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* apm=on/off enable/disable APM
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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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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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* 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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unsigned int suser: 1;
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unsigned int writer: 1;
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unsigned int reader: 1;
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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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struct apm_queue queue;
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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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static int apm_disabled;
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static int mips_apm_active;
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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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* 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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* 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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static const char driver_version[] = "1.13"; /* no spaces */
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/*
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* Compatibility cruft until the IPAQ people move over to the new
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* interface.
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*/
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static void __apm_get_power_status(struct apm_power_info *info)
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{
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}
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/*
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* This allows machines to provide their own "apm get power status" function.
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*/
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void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;
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EXPORT_SYMBOL(apm_get_power_status);
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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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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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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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if (notified++ == 0)
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printk(KERN_ERR "apm: an event queue overflowed\n");
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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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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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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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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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down_read(&user_list_lock);
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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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static void apm_suspend(void)
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{
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struct apm_user *as;
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int err = pm_suspend(PM_SUSPEND_MEM);
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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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* 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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wake_up(&apm_suspend_waitqueue);
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}
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static ssize_t apm_read(struct file *fp, char __user *buf, 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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if (count < sizeof(apm_event_t))
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return -EINVAL;
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if (queue_empty(&as->queue) && fp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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wait_event_interruptible(apm_waitqueue, !queue_empty(&as->queue));
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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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ret = -EFAULT;
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if (copy_to_user(buf, &event, sizeof(event)))
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break;
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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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buf += sizeof(event);
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i -= sizeof(event);
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}
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if (i < count)
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ret = count - i;
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return ret;
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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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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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* 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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if (!as->suser || !as->writer)
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return -EPERM;
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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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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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* 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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* 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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* 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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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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return err;
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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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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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* 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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kfree(as);
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return 0;
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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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as = (struct apm_user *)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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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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filp->private_data = as;
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}
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return as ? 0 : -ENOMEM;
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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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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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#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)
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* 0xff: Unknown
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* 4) Battery status
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* 0x00: High
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* 0x01: Low
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* 0x02: Critical
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* 0x03: Charging
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* 0x04: Selected battery not present (BIOS >= 1.2 only)
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* 0xff: Unknown
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* 5) Battery flag
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* bit 0: High
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* bit 1: Low
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* bit 2: Critical
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* bit 3: Charging
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* bit 7: No system battery
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* 0xff: Unknown
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* 6) Remaining battery life (percentage of charge):
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* 0-100: valid
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* -1: Unknown
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* 7) Remaining battery life (time units):
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* Number of remaining minutes or seconds
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* -1: Unknown
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* 8) min = minutes; sec = seconds
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*/
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static int apm_get_info(char *buf, char **start, off_t fpos, int length)
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{
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struct apm_power_info info;
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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) || !mips_apm_active);
|
||||
|
||||
if (!mips_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;
|
||||
}
|
||||
|
||||
mips_apm_active = 1;
|
||||
|
||||
ret = kernel_thread(kapmd, NULL, CLONE_KERNEL);
|
||||
if (ret < 0) {
|
||||
mips_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);
|
||||
|
||||
mips_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);
|
||||
|
||||
mips_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);
|
||||
|
|
@ -0,0 +1,65 @@
|
|||
/* -*- linux-c -*-
|
||||
*
|
||||
* (C) 2003 zecke@handhelds.org
|
||||
*
|
||||
* GPL version 2
|
||||
*
|
||||
* based on arch/arm/kernel/apm.c
|
||||
* factor out the information needed by architectures to provide
|
||||
* apm status
|
||||
*
|
||||
*
|
||||
*/
|
||||
#ifndef MIPS_ASM_SA1100_APM_H
|
||||
#define MIPS_ASM_SA1100_APM_H
|
||||
|
||||
#include <linux/config.h>
|
||||
#include <linux/apm_bios.h>
|
||||
|
||||
/*
|
||||
* This structure gets filled in by the machine specific 'get_power_status'
|
||||
* implementation. Any fields which are not set default to a safe value.
|
||||
*/
|
||||
struct apm_power_info {
|
||||
unsigned char ac_line_status;
|
||||
#define APM_AC_OFFLINE 0
|
||||
#define APM_AC_ONLINE 1
|
||||
#define APM_AC_BACKUP 2
|
||||
#define APM_AC_UNKNOWN 0xff
|
||||
|
||||
unsigned char battery_status;
|
||||
#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
|
||||
|
||||
unsigned char battery_flag;
|
||||
#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
|
||||
|
||||
int battery_life;
|
||||
int time;
|
||||
int units;
|
||||
#define APM_UNITS_MINS 0
|
||||
#define APM_UNITS_SECS 1
|
||||
#define APM_UNITS_UNKNOWN -1
|
||||
|
||||
};
|
||||
|
||||
/*
|
||||
* This allows machines to provide their own "apm get power status" function.
|
||||
*/
|
||||
extern void (*apm_get_power_status)(struct apm_power_info *);
|
||||
|
||||
/*
|
||||
* Queue an event (APM_SYS_SUSPEND or APM_CRITICAL_SUSPEND)
|
||||
*/
|
||||
void apm_queue_event(apm_event_t event);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue