/*!
* @brief Used to configure the device for debouncing.
*
* When the Connecting State: debounce is entered, it indicates
* that one of the other states believes that an accessory may be attached to the
* phone. It is the job of the Connecting: Debounce state to determine if an
* accessory is attached and then to identify the accessory. Some accessories may
* be able to be identified in this state (i.e., no additional steps are needed in
* order to uniquely identify the accessory) where other accessories require
* additional processing before they can be identified. This additional processing
* is handled in the other states in the Connecting family.
*
* The entry function is responsible for configuring the hardware in the way that
* will allow for the debouncing of accessory insertion and to begin the process
* of accessory identification. Additionally, a number of debounce variables will
* need to be reset.
*
* @param prev_state the previous EMU state
* @param polling_interval a return parameter that holds the "polling rate"
*/
void debounce_dev_type_enter(EMU_STATE_T prev_state, int *polling_interval)
{
/* Mask ID and VBUS interrupts */
power_ic_event_mask(EMU_INT_VBUS);
power_ic_event_mask(EMU_INT_ID);
*polling_interval = EMU_POLL_CONTINUE;
emu_default_register_settings(polling_interval);
}
/*!
* @brief Used to mask the EMU bus interrupts and always transitions directly
* to the Connecting State: debounce.
*
* The handler will be called if an ID, VBUS or SE1 interrupt occur, or if the
* unpowered SIHF delay expires. If one of the interrupts is seen or the unpowered
* SIHF delay expires, the state will be change to the Connecting State: debounce
* in order to complete the identification of the accessory.
*
* @param polling_interval a return parameter that holds the "polling rate"
*
* @return next_state tells the state machine what the next EMU state is
*/
EMU_STATE_T unpowered_sihf_handler(int *polling_interval)
{
/* Mask the interrupts */
power_ic_event_mask(EMU_INT_SE1);
power_ic_event_mask(EMU_INT_VBUS);
power_ic_event_mask(EMU_INT_ID);
*polling_interval = EMU_POLL_CONTINUE;
/* Always go back to debouncing */
return EMU_STATE_CONNECTING__DEBOUNCE_DEV_TYPE;
}
static int emu_proc_open(struct inode *inode, struct file *file)
{
/* take mutex */
if(down_interruptible(&emu_proc_opened_mutex))
{
tracemsg(_k_d("process received signal while waiting for power ic opened mutex. Exiting."));
return -EINTR;
}
/* Check if the proc is not already open */
if (emu_proc_opened == true)
{
tracemsg(_k_d("/proc/emu control already opened.\n"));
/* Release mutex */
up(&emu_proc_opened_mutex);
return -EBUSY;
}
/* Set the opened state */
emu_proc_opened = true;
/* MASK VBUS INT */
power_ic_event_mask(EMU_INT_VBUS);
/* Unsubsribe usb detection light driver handler on VBUS */
power_ic_event_unsubscribe(EMU_INT_VBUS,usb_detection_int_handler);
/* Subscribe to the EMU interrupt events */
power_ic_event_subscribe(EMU_INT_VBUS, emu_glue_int_handler);
power_ic_event_subscribe(EMU_INT_ID, emu_glue_int_handler);
power_ic_event_subscribe(EMU_INT_SE1, emu_glue_int_handler);
/* Release mutex */
up(&emu_proc_opened_mutex);
return 0;
}