/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _HVSI_H
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#define _HVSI_H
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#define VS_DATA_PACKET_HEADER 0xff
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#define VS_CONTROL_PACKET_HEADER 0xfe
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#define VS_QUERY_PACKET_HEADER 0xfd
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#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
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/* control verbs */
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#define VSV_SET_MODEM_CTL 1 /* to service processor only */
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#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
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#define VSV_CLOSE_PROTOCOL 3
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/* query verbs */
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#define VSV_SEND_VERSION_NUMBER 1
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#define VSV_SEND_MODEM_CTL_STATUS 2
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/* yes, these masks are not consecutive. */
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#define HVSI_TSDTR 0x01
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#define HVSI_TSCD 0x20
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#define HVSI_MAX_OUTGOING_DATA 12
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#define HVSI_VERSION 1
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struct hvsi_header {
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uint8_t type;
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uint8_t len;
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__be16 seqno;
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} __attribute__((packed));
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struct hvsi_data {
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struct hvsi_header hdr;
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uint8_t data[HVSI_MAX_OUTGOING_DATA];
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} __attribute__((packed));
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struct hvsi_control {
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struct hvsi_header hdr;
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__be16 verb;
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/* optional depending on verb: */
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__be32 word;
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__be32 mask;
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} __attribute__((packed));
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struct hvsi_query {
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struct hvsi_header hdr;
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__be16 verb;
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} __attribute__((packed));
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struct hvsi_query_response {
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struct hvsi_header hdr;
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__be16 verb;
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__be16 query_seqno;
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union {
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uint8_t version;
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__be32 mctrl_word;
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} u;
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} __attribute__((packed));
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/* hvsi lib struct definitions */
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#define HVSI_INBUF_SIZE 255
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struct tty_struct;
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struct hvsi_priv {
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unsigned int inbuf_len; /* data in input buffer */
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unsigned char inbuf[HVSI_INBUF_SIZE];
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unsigned int inbuf_cur; /* Cursor in input buffer */
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unsigned int inbuf_pktlen; /* packet length from cursor */
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atomic_t seqno; /* packet sequence number */
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unsigned int opened:1; /* driver opened */
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unsigned int established:1; /* protocol established */
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unsigned int is_console:1; /* used as a kernel console device */
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unsigned int mctrl_update:1; /* modem control updated */
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unsigned short mctrl; /* modem control */
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struct tty_struct *tty; /* tty structure */
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int (*get_chars)(uint32_t termno, char *buf, int count);
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int (*put_chars)(uint32_t termno, const char *buf, int count);
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uint32_t termno;
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};
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/* hvsi lib functions */
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struct hvc_struct;
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extern void hvsilib_init(struct hvsi_priv *pv,
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int (*get_chars)(uint32_t termno, char *buf, int count),
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int (*put_chars)(uint32_t termno, const char *buf,
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int count),
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int termno, int is_console);
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extern int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp);
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extern void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp);
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extern int hvsilib_read_mctrl(struct hvsi_priv *pv);
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extern int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr);
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extern void hvsilib_establish(struct hvsi_priv *pv);
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extern int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count);
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extern int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count);
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#endif /* _HVSI_H */
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