/*
* Monitor the presence of a charger and perform critical frequent steps
* such as running the battery voltage filter.
*/
static inline void power_thread_step(void)
{
/* If the power off timeout expires, the main thread has failed
to shut down the system, and we need to force a power off */
if (shutdown_timeout) {
shutdown_timeout -= POWER_THREAD_STEP_TICKS;
if (shutdown_timeout <= 0)
power_off();
}
#ifdef HAVE_RTC_ALARM
power_thread_rtc_process();
#endif
/*
* Do a digital exponential filter. We don't sample the battery if
* the disk is spinning unless we are in USB mode (the disk will most
* likely always be spinning in USB mode) or charging.
*/
if (!storage_disk_is_active() || usb_inserted()
#if CONFIG_CHARGING >= CHARGING_MONITOR
|| charger_input_state == CHARGER
#endif
) {
avgbat += battery_adc_voltage() - avgbat / BATT_AVE_SAMPLES;
/*
* battery_millivolts is the millivolt-scaled filtered battery value.
*/
battery_millivolts = avgbat / BATT_AVE_SAMPLES;
/* update battery status every time an update is available */
battery_status_update();
}
else if (battery_percent < 8) {
/*
* If battery is low, observe voltage during disk activity.
* Shut down if voltage drops below shutoff level and we are not
* using NiMH or Alkaline batteries.
*/
battery_millivolts = (battery_adc_voltage() +
battery_millivolts + 1) / 2;
/* update battery status every time an update is available */
battery_status_update();
if (!shutdown_timeout && query_force_shutdown()) {
sys_poweroff();
}
else {
avgbat += battery_millivolts - avgbat / BATT_AVE_SAMPLES;
}
}
} /* power_thread_step */
void buffering_thread(void)
{
bool filling = false;
struct queue_event ev;
while (true)
{
if (!filling) {
cancel_cpu_boost();
}
queue_wait_w_tmo(&buffering_queue, &ev, filling ? 5 : HZ/2);
switch (ev.id)
{
case Q_START_FILL:
LOGFQUEUE("buffering < Q_START_FILL %d", (int)ev.data);
/* Call buffer callbacks here because this is one of two ways
* to begin a full buffer fill */
send_event(BUFFER_EVENT_BUFFER_LOW, 0);
shrink_buffer();
queue_reply(&buffering_queue, 1);
filling |= buffer_handle((int)ev.data);
break;
case Q_BUFFER_HANDLE:
LOGFQUEUE("buffering < Q_BUFFER_HANDLE %d", (int)ev.data);
queue_reply(&buffering_queue, 1);
buffer_handle((int)ev.data);
break;
case Q_RESET_HANDLE:
LOGFQUEUE("buffering < Q_RESET_HANDLE %d", (int)ev.data);
queue_reply(&buffering_queue, 1);
reset_handle((int)ev.data);
break;
case Q_CLOSE_HANDLE:
LOGFQUEUE("buffering < Q_CLOSE_HANDLE %d", (int)ev.data);
queue_reply(&buffering_queue, close_handle((int)ev.data));
break;
case Q_HANDLE_ADDED:
LOGFQUEUE("buffering < Q_HANDLE_ADDED %d", (int)ev.data);
/* A handle was added: the disk is spinning, so we can fill */
filling = true;
break;
case Q_BASE_HANDLE:
LOGFQUEUE("buffering < Q_BASE_HANDLE %d", (int)ev.data);
base_handle_id = (int)ev.data;
break;
#ifndef SIMULATOR
case SYS_USB_CONNECTED:
LOGFQUEUE("buffering < SYS_USB_CONNECTED");
usb_acknowledge(SYS_USB_CONNECTED_ACK);
usb_wait_for_disconnect(&buffering_queue);
break;
#endif
case SYS_TIMEOUT:
LOGFQUEUE_SYS_TIMEOUT("buffering < SYS_TIMEOUT");
break;
}
update_data_counters();
/* If the buffer is low, call the callbacks to get new data */
if (num_handles > 0 && data_counters.useful <= conf_watermark)
send_event(BUFFER_EVENT_BUFFER_LOW, 0);
#if 0
/* TODO: This needs to be fixed to use the idle callback, disable it
* for simplicity until its done right */
#if MEM > 8
/* If the disk is spinning, take advantage by filling the buffer */
else if (storage_disk_is_active() && queue_empty(&buffering_queue))
{
if (num_handles > 0 && data_counters.useful <= high_watermark)
send_event(BUFFER_EVENT_BUFFER_LOW, 0);
if (data_counters.remaining > 0 && BUF_USED <= high_watermark)
{
/* This is a new fill, shrink the buffer up first */
if (!filling)
shrink_buffer();
filling = fill_buffer();
update_data_counters();
}
}
#endif
#endif
if (queue_empty(&buffering_queue)) {
if (filling) {
if (data_counters.remaining > 0 && BUF_USED < buffer_len)
filling = fill_buffer();
else if (data_counters.remaining == 0)
filling = false;
}
else if (ev.id == SYS_TIMEOUT)
{
if (data_counters.remaining > 0 &&
data_counters.useful <= conf_watermark) {
shrink_buffer();
filling = fill_buffer();
}
}
}
}
}
