drivers/bluetooth/hci_uart.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *
 *  Bluetooth HCI UART driver
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2004-2005  Marcel Holtmann <marcel@holtmann.org>
 */

#ifndef N_HCI
#define N_HCI	15
#endif

/* Ioctls */
#define HCIUARTSETPROTO		_IOW('U', 200, int)
#define HCIUARTGETPROTO		_IOR('U', 201, int)
#define HCIUARTGETDEVICE	_IOR('U', 202, int)
#define HCIUARTSETFLAGS		_IOW('U', 203, int)
#define HCIUARTGETFLAGS		_IOR('U', 204, int)

/* UART protocols */
#define HCI_UART_MAX_PROTO	13

#define HCI_UART_H4	0
#define HCI_UART_BCSP	1
#define HCI_UART_3WIRE	2
#define HCI_UART_H4DS	3
#define HCI_UART_LL	4
#define HCI_UART_ATH3K	5
#define HCI_UART_INTEL	6
#define HCI_UART_BCM	7
#define HCI_UART_QCA	8
#define HCI_UART_AG6XX	9
#define HCI_UART_NOKIA	10
#define HCI_UART_MRVL	11
#define HCI_UART_AML	12

#define HCI_UART_RAW_DEVICE	0
#define HCI_UART_RESET_ON_INIT	1
#define HCI_UART_INIT_PENDING	3
#define HCI_UART_EXT_CONFIG	4
#define HCI_UART_VND_DETECT	5

struct hci_uart;
struct serdev_device;

struct hci_uart_proto {
	unsigned int id;
	const char *name;
	unsigned int manufacturer;
	unsigned int init_speed;
	unsigned int oper_speed;
	int (*open)(struct hci_uart *hu);
	int (*close)(struct hci_uart *hu);
	int (*flush)(struct hci_uart *hu);
	int (*setup)(struct hci_uart *hu);
	int (*set_baudrate)(struct hci_uart *hu, unsigned int speed);
	int (*recv)(struct hci_uart *hu, const void *data, int len);
	int (*enqueue)(struct hci_uart *hu, struct sk_buff *skb);
	struct sk_buff *(*dequeue)(struct hci_uart *hu);
};

struct hci_uart {
	struct tty_struct	*tty;
	struct serdev_device	*serdev;
	struct hci_dev		*hdev;
	unsigned long		flags;
	unsigned long		hdev_flags;

	struct work_struct	init_ready;
	struct work_struct	write_work;

	const struct hci_uart_proto *proto;
	struct percpu_rw_semaphore proto_lock;	/* Stop work for proto close */
	void			*priv;

	struct sk_buff		*tx_skb;
	unsigned long		tx_state;

	unsigned int init_speed;
	unsigned int oper_speed;

	u8			alignment;
	u8			padding;
};

/* HCI_UART proto flag bits */
#define HCI_UART_PROTO_SET		0
#define HCI_UART_REGISTERED		1
#define HCI_UART_PROTO_READY		2
#define HCI_UART_NO_SUSPEND_NOTIFIER	3

/* TX states  */
#define HCI_UART_SENDING	1
#define HCI_UART_TX_WAKEUP	2

int hci_uart_register_proto(const struct hci_uart_proto *p);
int hci_uart_unregister_proto(const struct hci_uart_proto *p);

int hci_uart_register_device_priv(struct hci_uart *hu,
				  const struct hci_uart_proto *p,
				  int sizeof_priv);

static inline int hci_uart_register_device(struct hci_uart *hu,
					   const struct hci_uart_proto *p)
{
	return hci_uart_register_device_priv(hu, p, 0);
}

void hci_uart_unregister_device(struct hci_uart *hu);

int hci_uart_tx_wakeup(struct hci_uart *hu);
int hci_uart_wait_until_sent(struct hci_uart *hu);
int hci_uart_init_ready(struct hci_uart *hu);
void hci_uart_init_work(struct work_struct *work);
void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed);
bool hci_uart_has_flow_control(struct hci_uart *hu);
void hci_uart_set_flow_control(struct hci_uart *hu, bool enable);
void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
			 unsigned int oper_speed);

#ifdef CONFIG_BT_HCIUART_H4
int h4_init(void);
int h4_deinit(void);

struct h4_recv_pkt {
	u8  type;	/* Packet type */
	u8  hlen;	/* Header length */
	u8  loff;	/* Data length offset in header */
	u8  lsize;	/* Data length field size */
	u16 maxlen;	/* Max overall packet length */
	int (*recv)(struct hci_dev *hdev, struct sk_buff *skb);
};

#define H4_RECV_ACL \
	.type = HCI_ACLDATA_PKT, \
	.hlen = HCI_ACL_HDR_SIZE, \
	.loff = 2, \
	.lsize = 2, \
	.maxlen = HCI_MAX_FRAME_SIZE \

#define H4_RECV_SCO \
	.type = HCI_SCODATA_PKT, \
	.hlen = HCI_SCO_HDR_SIZE, \
	.loff = 2, \
	.lsize = 1, \
	.maxlen = HCI_MAX_SCO_SIZE

#define H4_RECV_EVENT \
	.type = HCI_EVENT_PKT, \
	.hlen = HCI_EVENT_HDR_SIZE, \
	.loff = 1, \
	.lsize = 1, \
	.maxlen = HCI_MAX_EVENT_SIZE

#define H4_RECV_ISO \
	.type = HCI_ISODATA_PKT, \
	.hlen = HCI_ISO_HDR_SIZE, \
	.loff = 2, \
	.lsize = 2, \
	.maxlen = HCI_MAX_FRAME_SIZE \

struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
			    const unsigned char *buffer, int count,
			    const struct h4_recv_pkt *pkts, int pkts_count);
#endif

#ifdef CONFIG_BT_HCIUART_BCSP
int bcsp_init(void);
int bcsp_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_LL
int ll_init(void);
int ll_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_ATH3K
int ath_init(void);
int ath_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_3WIRE
int h5_init(void);
int h5_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_INTEL
int intel_init(void);
int intel_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_BCM
int bcm_init(void);
int bcm_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_QCA
int qca_init(void);
int qca_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_AG6XX
int ag6xx_init(void);
int ag6xx_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_MRVL
int mrvl_init(void);
int mrvl_deinit(void);
#endif

#ifdef CONFIG_BT_HCIUART_AML
int aml_init(void);
int aml_deinit(void);
#endif