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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* cec-pin-priv.h - internal cec-pin header
*
* Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*/
#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,
/* Generate a start bit period that is too short */
CEC_ST_TX_START_BIT_HIGH_SHORT,
/* Generate a start bit period that is too long */
CEC_ST_TX_START_BIT_HIGH_LONG,
/* Drive CEC low for the start bit using the custom timing */
CEC_ST_TX_START_BIT_LOW_CUSTOM,
/* Drive CEC high for the start bit using the custom timing */
CEC_ST_TX_START_BIT_HIGH_CUSTOM,
/* 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,
/* Generate a bit period that is too short */
CEC_ST_TX_DATA_BIT_0_HIGH_SHORT,
/* Generate a bit period that is too long */
CEC_ST_TX_DATA_BIT_0_HIGH_LONG,
/* 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,
/* Generate a bit period that is too short */
CEC_ST_TX_DATA_BIT_1_HIGH_SHORT,
/* Generate a bit period that is too long */
CEC_ST_TX_DATA_BIT_1_HIGH_LONG,
/*
* 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,
/* Generate a bit period that is too short */
CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT,
/* Generate a bit period that is too long */
CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG,
/* Drive CEC low for a data bit using the custom timing */
CEC_ST_TX_DATA_BIT_LOW_CUSTOM,
/* Drive CEC high for a data bit using the custom timing */
CEC_ST_TX_DATA_BIT_HIGH_CUSTOM,
/* Drive CEC low for a standalone pulse using the custom timing */
CEC_ST_TX_PULSE_LOW_CUSTOM,
/* Drive CEC high for a standalone pulse using the custom timing */
CEC_ST_TX_PULSE_HIGH_CUSTOM,
/* Start low drive */
CEC_ST_TX_LOW_DRIVE,
/* 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 low (i.e. end of bit period) */
CEC_ST_RX_DATA_WAIT_FOR_LOW,
/* 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_RX_LOW_DRIVE,
/* Monitor pin using interrupts */
CEC_ST_RX_IRQ,
/* Total number of pin states */
CEC_PIN_STATES
};
/* Error Injection */
/* Error injection modes */
#define CEC_ERROR_INJ_MODE_OFF 0
#define CEC_ERROR_INJ_MODE_ONCE 1
#define CEC_ERROR_INJ_MODE_ALWAYS 2
#define CEC_ERROR_INJ_MODE_TOGGLE 3
#define CEC_ERROR_INJ_MODE_MASK 3ULL
/* Receive error injection options */
#define CEC_ERROR_INJ_RX_NACK_OFFSET 0
#define CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET 2
#define CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET 4
#define CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET 6
#define CEC_ERROR_INJ_RX_ARB_LOST_OFFSET 8
#define CEC_ERROR_INJ_RX_MASK 0xffffULL
/* Transmit error injection options */
#define CEC_ERROR_INJ_TX_NO_EOM_OFFSET 16
#define CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET 18
#define CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET 20
#define CEC_ERROR_INJ_TX_LONG_BIT_OFFSET 22
#define CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET 24
#define CEC_ERROR_INJ_TX_SHORT_START_OFFSET 26
#define CEC_ERROR_INJ_TX_LONG_START_OFFSET 28
#define CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET 30
#define CEC_ERROR_INJ_TX_LAST_BIT_OFFSET 32
#define CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET 34
#define CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET 36
#define CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET 38
#define CEC_ERROR_INJ_TX_MASK 0xffffffffffff0000ULL
#define CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX 0
#define CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX 1
#define CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX 2
#define CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX 3
#define CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX 4
#define CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX 5
#define CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX 6
#define CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX 7
#define CEC_ERROR_INJ_NUM_ARGS 8
/* Special CEC op values */
#define CEC_ERROR_INJ_OP_ANY 0x00000100
/* The default for the low/high time of the custom pulse */
#define CEC_TIM_CUSTOM_DEFAULT 1000
#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;
bool tx_toggle;
struct cec_msg rx_msg;
u32 rx_bit;
bool rx_toggle;
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;
u32 tx_custom_low_usecs;
u32 tx_custom_high_usecs;
bool tx_ignore_nack_until_eom;
bool tx_custom_pulse;
bool tx_generated_poll;
bool tx_post_eom;
u8 tx_extra_bytes;
#ifdef CONFIG_CEC_PIN_ERROR_INJ
u64 error_inj[CEC_ERROR_INJ_OP_ANY + 1];
u8 error_inj_args[CEC_ERROR_INJ_OP_ANY + 1][CEC_ERROR_INJ_NUM_ARGS];
#endif
};
void cec_pin_start_timer(struct cec_pin *pin);
#ifdef CONFIG_CEC_PIN_ERROR_INJ
bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line);
int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf);
u16 cec_pin_rx_error_inj(struct cec_pin *pin);
u16 cec_pin_tx_error_inj(struct cec_pin *pin);
#endif
#endif
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