linux内核3.x的电源管理研究

/*************************** Main ***********************************/

int main(int argc, char **argv)

{

    XX_Autosleep_Enable(1);



    while (deamon_flag) {

        sleep(1);

    }



    return 0;

}

  221.312292] Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.

[  221.322026] Suspending console(s) (use no_console_suspend to debug)

[  221.356825] [gale] quectel_low_consume_suspend: OK ###############################

[  221.362071] msm_serial_hs_suspend(): jun test

[  221.362078] PM: suspend of devices complete after 32.311 msecs

[  221.363456] PM: late suspend of devices complete after 1.340 msecs

[  221.365111] PM: noirq suspend of devices complete after 1.614 msecs

[  221.365161] suspend ns:     221365144824        suspend cycles:       9966203615

[  221.365144] CPU0:msm_cpu_pm_enter_sleep mode:3 during suspend

[  221.365144] resume cycles:      10196593398

[  221.367060] PM: noirq resume of devices complete after 1.049 msecs

[  221.368093] PM: early resume of devices complete after 0.644 msecs

[  221.377232] Resume: sysfs_notify wakeup_in

[  221.377525] [gale] quectel_low_consume_resume:  ###############################

[  221.378102] msm_otg 78d9000.usb: phy_reset: success

[  221.436430] PM: resume of devices complete after 68.291 msecs

[  221.499950] msm_otg 78d9000.usb: msm_otg_reset motg->inputs=1, motg->id_state=1

[  221.500070] msm_otg 78d9000.usb: USB exited from low power mode

[  221.530945] Restarting tasks ... done.

[  221.553122] cpufreq: Frequency violation fixed for CPU0

[  221.558334] PM: suspend exit 1980-01-06 03:25:28.091607828 UTC

[  223.042426] PM: suspend entry 1980-01-06 03:25:29.575692202 UTC

[  223.047464] msm_otg 78d9000.usb: USB in low power mode

[  223.052538] PM: Syncing filesystems ... done.

[  223.062319] Freezing user space processes ... 

[  223.073352] mbim_read: Waiting failed

[  223.080123] (elapsed 0.013 seconds) done.

[  223.083133] Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.

[  223.092845] Suspending console(s) (use no_console_suspend to debug)

Freezing remaining freezable tasks

static int __init pm_init(void)

{

        int error = pm_start_workqueue();

        if (error)

                return error;

        hibernate_image_size_init();

        hibernate_reserved_size_init();

        power_kobj = kobject_create_and_add("power", NULL);

        if (!power_kobj)

                return -ENOMEM;

#ifdef CONFIG_X86_INTEL_XGOLD

        power_hal_kobj = kobject_create_and_add("power_HAL_suspend",

                                        power_kobj);

        if (!power_hal_kobj)

                return -ENOMEM;

#endif

        error = sysfs_create_group(power_kobj, &attr_group);

        if (error)

                return error;

        pm_print_times_init();

        return pm_autosleep_init();

}



core_initcall(pm_init);

kernel-src/kernel/power/main.c

static struct attribute * g[] = {

        &state_attr.attr,

#ifdef CONFIG_PM_TRACE

        &pm_trace_attr.attr,

        &pm_trace_dev_match_attr.attr,

#endif

#ifdef CONFIG_PM_SLEEP

        &pm_async_attr.attr,

        &wakeup_count_attr.attr,

#ifdef CONFIG_PM_AUTOSLEEP

        &autosleep_attr.attr,

#endif

#ifdef CONFIG_PM_WAKELOCKS

        &wake_lock_attr.attr,

        &wake_unlock_attr.attr,

#endif

#ifdef CONFIG_PM_DEBUG

        &pm_test_attr.attr,

#endif

#ifdef CONFIG_PM_SLEEP_DEBUG

        &pm_print_times_attr.attr,

#endif

#endif

#ifdef CONFIG_FREEZER

        &pm_freeze_timeout_attr.attr,

#endif

        NULL,

};

# ls /sys/power/

autosleep          pm_freeze_timeout  wake_lock          wakeup_count

pm_async           state              wake_unlock