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/*
* Shared Transport Core header file
*
* Copyright (C) 2009 Texas Instruments
*
* This program is free software; you can redistribute 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 that 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
*
*/
#ifndef ST_CORE_H
#define ST_CORE_H
#include <linux/skbuff.h>
#include "st.h"
/* states of protocol list */
#define ST_NOTEMPTY 1
#define ST_EMPTY 0
/*
* possible st_states
*/
#define ST_INITIALIZING 1
#define ST_REG_IN_PROGRESS 2
#define ST_REG_PENDING 3
#define ST_WAITING_FOR_RESP 4
/**
* struct st_data_s - ST core internal structure
* @st_state: different states of ST like initializing, registration
* in progress, this is mainly used to return relevant err codes
* when protocol drivers are registering. It is also used to track
* the recv function, as in during fw download only HCI events
* can occur , where as during other times other events CH8, CH9
* can occur.
* @tty: tty provided by the TTY core for line disciplines.
* @ldisc_ops: the procedures that this line discipline registers with TTY.
* @tx_skb: If for some reason the tty's write returns lesser bytes written
* then to maintain the rest of data to be written on next instance.
* This needs to be protected, hence the lock inside wakeup func.
* @tx_state: if the data is being written onto the TTY and protocol driver
* wants to send more, queue up data and mark that there is
* more data to send.
* @list: the list of protocols registered, only MAX can exist, one protocol
* can register only once.
* @rx_state: states to be maintained inside st's tty receive
* @rx_count: count to be maintained inside st's tty receieve
* @rx_skb: the skb where all data for a protocol gets accumulated,
* since tty might not call receive when a complete event packet
* is received, the states, count and the skb needs to be maintained.
* @txq: the list of skbs which needs to be sent onto the TTY.
* @tx_waitq: if the chip is not in AWAKE state, the skbs needs to be queued
* up in here, PM(WAKEUP_IND) data needs to be sent and then the skbs
* from waitq can be moved onto the txq.
* Needs locking too.
* @lock: the lock to protect skbs, queues, and ST states.
* @protos_registered: count of the protocols registered, also when 0 the
* chip enable gpio can be toggled, and when it changes to 1 the fw
* needs to be downloaded to initialize chip side ST.
* @ll_state: the various PM states the chip can be, the states are notified
* to us, when the chip sends relevant PM packets(SLEEP_IND, WAKE_IND).
* @kim_data: reference to the parent encapsulating structure.
*
*/
struct st_data_s {
unsigned long st_state;
struct tty_struct *tty;
struct tty_ldisc_ops *ldisc_ops;
struct sk_buff *tx_skb;
#define ST_TX_SENDING 1
#define ST_TX_WAKEUP 2
unsigned long tx_state;
struct st_proto_s *list[ST_MAX];
unsigned long rx_state;
unsigned long rx_count;
struct sk_buff *rx_skb;
struct sk_buff_head txq, tx_waitq;
spinlock_t lock;
unsigned char protos_registered;
unsigned long ll_state;
void *kim_data;
};
/**
* st_int_write -
* point this to tty->driver->write or tty->ops->write
* depending upon the kernel version
*/
int st_int_write(struct st_data_s*, const unsigned char*, int);
/**
* st_write -
* internal write function, passed onto protocol drivers
* via the write function ptr of protocol struct
*/
long st_write(struct sk_buff *);
/* function to be called from ST-LL */
void st_ll_send_frame(enum proto_type, struct sk_buff *);
/* internal wake up function */
void st_tx_wakeup(struct st_data_s *st_data);
/* init, exit entry funcs called from KIM */
int st_core_init(struct st_data_s **);
void st_core_exit(struct st_data_s *);
/* ask for reference from KIM */
void st_kim_ref(struct st_data_s **);
#define GPS_STUB_TEST
#ifdef GPS_STUB_TEST
int gps_chrdrv_stub_write(const unsigned char*, int);
void gps_chrdrv_stub_init(void);
#endif
#endif /*ST_CORE_H */
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