/*
 * Optional HS + kernel RX FIFO diagnostics for pog422_uartd.
 *
 * Enable:  #define POG422_UARTD_HS_DIAG 1   (default)
 * Disable: #define POG422_UARTD_HS_DIAG 0   then rebuild
 *
 * Remove later:
 *   1. Delete this file
 *   2. Remove pog422_uartd_hs_diag.h include and HS_DIAG blocks in pog422_uartd.c
 *   3. Revert POG422_IPC_HS_DIAG / Python IPC_HS_DIAG + bridge handler
 *
 * events.jsonl: ev=hs_fifo_diag on bridge pos 3/4
 */
#ifndef POG422_UARTD_HS_DIAG_H
#define POG422_UARTD_HS_DIAG_H

#include <stdint.h>

#define POG422_UARTD_HS_DIAG 1

#if POG422_UARTD_HS_DIAG

#define POG422_IPC_HS_DIAG 9u

#define POG422_HS_DIAG_RISE 0u
#define POG422_HS_DIAG_FALL_PRE 1u
#define POG422_HS_DIAG_FALL_POST 2u

typedef struct __attribute__((packed)) {
    uint64_t mono_ns;
    uint8_t phase; /* POG422_HS_DIAG_* */
    uint8_t slv_in;
    uint8_t cap_burst_on_fall;
    uint8_t reserved;
    uint32_t fifo_avail;  /* FIONREAD — kernel tty RX queue */
    uint32_t hw_fifo_avail; /* XR21 RX_FIFO_COUNT @ 0x044 — chip FIFO */
    uint32_t cap_len;
    uint32_t drain_bytes; /* bytes read() this HS fall */
    uint8_t probe_off;    /* cap_buf offset of probe[0] */
    uint8_t probe_len;
    uint8_t probe[8];     /* 9D.. or F2.. triplet when present */
    uint64_t driver_rx_chars; /* XR_GET_RX_STATS.chars_inserted at emit time */
} pog422_ipc_hs_diag_t;

#endif /* POG422_UARTD_HS_DIAG */

#endif /* POG422_UARTD_HS_DIAG_H */