/*
* cec-pin-priv.h - internal cec-pin header
*
* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef LINUX_CEC_PIN_PRIV_H
#define LINUX_CEC_PIN_PRIV_H
#include <linux/types.h>
#include <linux/atomic.h>
#include <media/cec-pin.h>
enum cec_pin_state {
/* CEC is off */
CEC_ST_OFF,
/* CEC is idle, waiting for Rx or Tx */
CEC_ST_IDLE,
/* Tx states */
/* Pending Tx, waiting for Signal Free Time to expire */
CEC_ST_TX_WAIT,
/* Low-drive was detected, wait for bus to go high */
CEC_ST_TX_WAIT_FOR_HIGH,
/* Drive CEC low for the start bit */
CEC_ST_TX_START_BIT_LOW,
/* Drive CEC high for the start bit */
CEC_ST_TX_START_BIT_HIGH,
/* Drive CEC low for the 0 bit */
CEC_ST_TX_DATA_BIT_0_LOW,
/* Drive CEC high for the 0 bit */
CEC_ST_TX_DATA_BIT_0_HIGH,
/* Drive CEC low for the 1 bit */
CEC_ST_TX_DATA_BIT_1_LOW,
/* Drive CEC high for the 1 bit */
CEC_ST_TX_DATA_BIT_1_HIGH,
/*
* Wait for start of sample time to check for Ack bit or first
* four initiator bits to check for Arbitration Lost.
*/
CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE,
/* Wait for end of bit period after sampling */
CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE,
/* Rx states */
/* Start bit low detected */
CEC_ST_RX_START_BIT_LOW,
/* Start bit high detected */
CEC_ST_RX_START_BIT_HIGH,
/* Wait for bit sample time */
CEC_ST_RX_DATA_SAMPLE,
/* Wait for earliest end of bit period after sampling */
CEC_ST_RX_DATA_POST_SAMPLE,
/* Wait for CEC to go high (i.e. end of bit period */
CEC_ST_RX_DATA_HIGH,
/* Drive CEC low to send 0 Ack bit */
CEC_ST_RX_ACK_LOW,
/* End of 0 Ack time, wait for earliest end of bit period */
CEC_ST_RX_ACK_LOW_POST,
/* Wait for CEC to go high (i.e. end of bit period */
CEC_ST_RX_ACK_HIGH_POST,
/* Wait for earliest end of bit period and end of message */
CEC_ST_RX_ACK_FINISH,
/* Start low drive */
CEC_ST_LOW_DRIVE,
/* Monitor pin using interrupts */
CEC_ST_RX_IRQ,
/* Total number of pin states */
CEC_PIN_STATES
};
#define CEC_NUM_PIN_EVENTS 128
#define CEC_PIN_IRQ_UNCHANGED 0
#define CEC_PIN_IRQ_DISABLE 1
#define CEC_PIN_IRQ_ENABLE 2
struct cec_pin {
struct cec_adapter *adap;
const struct cec_pin_ops *ops;
struct task_struct *kthread;
wait_queue_head_t kthread_waitq;
struct hrtimer timer;
ktime_t ts;
unsigned int wait_usecs;
u16 la_mask;
bool enabled;
bool monitor_all;
bool rx_eom;
bool enable_irq_failed;
enum cec_pin_state state;
struct cec_msg tx_msg;
u32 tx_bit;
bool tx_nacked;
u32 tx_signal_free_time;
struct cec_msg rx_msg;
u32 rx_bit;
struct cec_msg work_rx_msg;
u8 work_tx_status;
ktime_t work_tx_ts;
atomic_t work_irq_change;
atomic_t work_pin_events;
unsigned int work_pin_events_wr;
unsigned int work_pin_events_rd;
ktime_t work_pin_ts[CEC_NUM_PIN_EVENTS];
bool work_pin_is_high[CEC_NUM_PIN_EVENTS];
ktime_t timer_ts;
u32 timer_cnt;
u32 timer_100ms_overruns;
u32 timer_300ms_overruns;
u32 timer_max_overrun;
u32 timer_sum_overrun;
};
#endif
